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  */
  31
  32 #define DEBUG_SUBSYSTEM S_LNET
  33
  34 #include <linux/ctype.h>
  35 #include <linux/log2.h>
  36 #include <linux/ktime.h>
  37 #include <linux/moduleparam.h>
  38 #include <linux/uaccess.h>
  39 #ifdef HAVE_SCHED_HEADERS
  40 #include <linux/sched/signal.h>
  41 #endif
  42 #include <lnet/udsp.h>
  43 #include <lnet/lib-lnet.h>
  44
  45 #define D_LNI D_CONSOLE
  46
  47 /*
  48  * initialize ln_api_mutex statically, since it needs to be used in
  49  * discovery_set callback. That module parameter callback can be called
  50  * before module init completes. The mutex needs to be ready for use then.
  51  */
  52 struct lnet the_lnet = {
  53         .ln_api_mutex = __MUTEX_INITIALIZER(the_lnet.ln_api_mutex),
  54 };              /* THE state of the network */
  55 EXPORT_SYMBOL(the_lnet);
  56
  57 static char *ip2nets = "";
  58 module_param(ip2nets, charp, 0444);
  59 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
  60
  61 static char *networks = "";
  62 module_param(networks, charp, 0444);
  63 MODULE_PARM_DESC(networks, "local networks");
  64
  65 static char *routes = "";
  66 module_param(routes, charp, 0444);
  67 MODULE_PARM_DESC(routes, "routes to non-local networks");
  68
  69 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
  70 module_param(rnet_htable_size, int, 0444);
  71 MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
  72
  73 static int use_tcp_bonding;
  74 module_param(use_tcp_bonding, int, 0444);
  75 MODULE_PARM_DESC(use_tcp_bonding,
  76                  "use_tcp_bonding parameter has been removed");
  77
  78 unsigned int lnet_numa_range = 0;
  79 module_param(lnet_numa_range, uint, 0444);
  80 MODULE_PARM_DESC(lnet_numa_range,
  81                 "NUMA range to consider during Multi-Rail selection");
  82
  83 /*
  84  * lnet_health_sensitivity determines by how much we decrement the health
  85  * value on sending error. The value defaults to 100, which means health
  86  * interface health is decremented by 100 points every failure.
  87  */
  88 unsigned int lnet_health_sensitivity = 100;
  89 static int sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp);
  90 #ifdef HAVE_KERNEL_PARAM_OPS
  91 static struct kernel_param_ops param_ops_health_sensitivity = {
  92         .set = sensitivity_set,
  93         .get = param_get_int,
  94 };
  95 #define param_check_health_sensitivity(name, p) \
  96                 __param_check(name, p, int)
  97 module_param(lnet_health_sensitivity, health_sensitivity, S_IRUGO|S_IWUSR);
  98 #else
  99 module_param_call(lnet_health_sensitivity, sensitivity_set, param_get_int,
 100                   &lnet_health_sensitivity, S_IRUGO|S_IWUSR);
 101 #endif
 102 MODULE_PARM_DESC(lnet_health_sensitivity,
 103                 "Value to decrement the health value by on error");
 104
 105 /*
 106  * lnet_recovery_interval determines how often we should perform recovery
 107  * on unhealthy interfaces.
 108  */
 109 unsigned int lnet_recovery_interval = 1;
 110 static int recovery_interval_set(const char *val, cfs_kernel_param_arg_t *kp);
 111 #ifdef HAVE_KERNEL_PARAM_OPS
 112 static struct kernel_param_ops param_ops_recovery_interval = {
 113         .set = recovery_interval_set,
 114         .get = param_get_int,
 115 };
 116 #define param_check_recovery_interval(name, p) \
 117                 __param_check(name, p, int)
 118 module_param(lnet_recovery_interval, recovery_interval, S_IRUGO|S_IWUSR);
 119 #else
 120 module_param_call(lnet_recovery_interval, recovery_interval_set, param_get_int,
 121                   &lnet_recovery_interval, S_IRUGO|S_IWUSR);
 122 #endif
 123 MODULE_PARM_DESC(lnet_recovery_interval,
 124                 "DEPRECATED - Interval to recover unhealthy interfaces in seconds");
 125
 126 unsigned int lnet_recovery_limit;
 127 module_param(lnet_recovery_limit, uint, 0644);
 128 MODULE_PARM_DESC(lnet_recovery_limit,
 129                  "How long to attempt recovery of unhealthy peer interfaces in seconds. Set to 0 to allow indefinite recovery");
 130
 131 static int lnet_interfaces_max = LNET_INTERFACES_MAX_DEFAULT;
 132 static int intf_max_set(const char *val, cfs_kernel_param_arg_t *kp);
 133
 134 static struct kernel_param_ops param_ops_interfaces_max = {
 135         .set = intf_max_set,
 136         .get = param_get_int,
 137 };
 138
 139 #define param_check_interfaces_max(name, p) \
 140                 __param_check(name, p, int)
 141
 142 #ifdef HAVE_KERNEL_PARAM_OPS
 143 module_param(lnet_interfaces_max, interfaces_max, 0644);
 144 #else
 145 module_param_call(lnet_interfaces_max, intf_max_set, param_get_int,
 146                   &param_ops_interfaces_max, 0644);
 147 #endif
 148 MODULE_PARM_DESC(lnet_interfaces_max,
 149                 "Maximum number of interfaces in a node.");
 150
 151 unsigned lnet_peer_discovery_disabled = 0;
 152 static int discovery_set(const char *val, cfs_kernel_param_arg_t *kp);
 153
 154 static struct kernel_param_ops param_ops_discovery_disabled = {
 155         .set = discovery_set,
 156         .get = param_get_int,
 157 };
 158
 159 #define param_check_discovery_disabled(name, p) \
 160                 __param_check(name, p, int)
 161 #ifdef HAVE_KERNEL_PARAM_OPS
 162 module_param(lnet_peer_discovery_disabled, discovery_disabled, 0644);
 163 #else
 164 module_param_call(lnet_peer_discovery_disabled, discovery_set, param_get_int,
 165                   &param_ops_discovery_disabled, 0644);
 166 #endif
 167 MODULE_PARM_DESC(lnet_peer_discovery_disabled,
 168                 "Set to 1 to disable peer discovery on this node.");
 169
 170 unsigned int lnet_drop_asym_route;
 171 static int drop_asym_route_set(const char *val, cfs_kernel_param_arg_t *kp);
 172
 173 static struct kernel_param_ops param_ops_drop_asym_route = {
 174         .set = drop_asym_route_set,
 175         .get = param_get_int,
 176 };
 177
 178 #define param_check_drop_asym_route(name, p)    \
 179         __param_check(name, p, int)
 180 #ifdef HAVE_KERNEL_PARAM_OPS
 181 module_param(lnet_drop_asym_route, drop_asym_route, 0644);
 182 #else
 183 module_param_call(lnet_drop_asym_route, drop_asym_route_set, param_get_int,
 184                   &param_ops_drop_asym_route, 0644);
 185 #endif
 186 MODULE_PARM_DESC(lnet_drop_asym_route,
 187                  "Set to 1 to drop asymmetrical route messages.");
 188
 189 #define LNET_TRANSACTION_TIMEOUT_DEFAULT 50
 190 unsigned int lnet_transaction_timeout = LNET_TRANSACTION_TIMEOUT_DEFAULT;
 191 static int transaction_to_set(const char *val, cfs_kernel_param_arg_t *kp);
 192 #ifdef HAVE_KERNEL_PARAM_OPS
 193 static struct kernel_param_ops param_ops_transaction_timeout = {
 194         .set = transaction_to_set,
 195         .get = param_get_int,
 196 };
 197
 198 #define param_check_transaction_timeout(name, p) \
 199                 __param_check(name, p, int)
 200 module_param(lnet_transaction_timeout, transaction_timeout, S_IRUGO|S_IWUSR);
 201 #else
 202 module_param_call(lnet_transaction_timeout, transaction_to_set, param_get_int,
 203                   &lnet_transaction_timeout, S_IRUGO|S_IWUSR);
 204 #endif
 205 MODULE_PARM_DESC(lnet_transaction_timeout,
 206                 "Maximum number of seconds to wait for a peer response.");
 207
 208 #define LNET_RETRY_COUNT_DEFAULT 2
 209 unsigned int lnet_retry_count = LNET_RETRY_COUNT_DEFAULT;
 210 static int retry_count_set(const char *val, cfs_kernel_param_arg_t *kp);
 211 #ifdef HAVE_KERNEL_PARAM_OPS
 212 static struct kernel_param_ops param_ops_retry_count = {
 213         .set = retry_count_set,
 214         .get = param_get_int,
 215 };
 216
 217 #define param_check_retry_count(name, p) \
 218                 __param_check(name, p, int)
 219 module_param(lnet_retry_count, retry_count, S_IRUGO|S_IWUSR);
 220 #else
 221 module_param_call(lnet_retry_count, retry_count_set, param_get_int,
 222                   &lnet_retry_count, S_IRUGO|S_IWUSR);
 223 #endif
 224 MODULE_PARM_DESC(lnet_retry_count,
 225                  "Maximum number of times to retry transmitting a message");
 226
 227 unsigned int lnet_response_tracking = 3;
 228 static int response_tracking_set(const char *val, cfs_kernel_param_arg_t *kp);
 229
 230 #ifdef HAVE_KERNEL_PARAM_OPS
 231 static struct kernel_param_ops param_ops_response_tracking = {
 232         .set = response_tracking_set,
 233         .get = param_get_int,
 234 };
 235
 236 #define param_check_response_tracking(name, p)  \
 237         __param_check(name, p, int)
 238 module_param(lnet_response_tracking, response_tracking, 0644);
 239 #else
 240 module_param_call(lnet_response_tracking, response_tracking_set, param_get_int,
 241                   &lnet_response_tracking, 0644);
 242 #endif
 243 MODULE_PARM_DESC(lnet_response_tracking,
 244                  "(0|1|2|3) LNet Internal Only|GET Reply only|PUT ACK only|Full Tracking (default)");
 245
 246 #define LNET_LND_TIMEOUT_DEFAULT ((LNET_TRANSACTION_TIMEOUT_DEFAULT - 1) / \
 247                                   (LNET_RETRY_COUNT_DEFAULT + 1))
 248 unsigned int lnet_lnd_timeout = LNET_LND_TIMEOUT_DEFAULT;
 249 static void lnet_set_lnd_timeout(void)
 250 {
 251         lnet_lnd_timeout = (lnet_transaction_timeout - 1) /
 252                            (lnet_retry_count + 1);
 253 }
 254
 255 /*
 256  * This sequence number keeps track of how many times DLC was used to
 257  * update the local NIs. It is incremented when a NI is added or
 258  * removed and checked when sending a message to determine if there is
 259  * a need to re-run the selection algorithm. See lnet_select_pathway()
 260  * for more details on its usage.
 261  */
 262 static atomic_t lnet_dlc_seq_no = ATOMIC_INIT(0);
 263
 264 static int lnet_ping(struct lnet_process_id id, signed long timeout,
 265                      struct lnet_process_id __user *ids, int n_ids);
 266
 267 static int lnet_discover(struct lnet_process_id id, __u32 force,
 268                          struct lnet_process_id __user *ids, int n_ids);
 269
 270 static int
 271 sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp)
 272 {
 273         int rc;
 274         unsigned *sensitivity = (unsigned *)kp->arg;
 275         unsigned long value;
 276
 277         rc = kstrtoul(val, 0, &value);
 278         if (rc) {
 279                 CERROR("Invalid module parameter value for 'lnet_health_sensitivity'\n");
 280                 return rc;
 281         }
 282
 283         /*
 284          * The purpose of locking the api_mutex here is to ensure that
 285          * the correct value ends up stored properly.
 286          */
 287         mutex_lock(&the_lnet.ln_api_mutex);
 288
 289         if (value > LNET_MAX_HEALTH_VALUE) {
 290                 mutex_unlock(&the_lnet.ln_api_mutex);
 291                 CERROR("Invalid health value. Maximum: %d value = %lu\n",
 292                        LNET_MAX_HEALTH_VALUE, value);
 293                 return -EINVAL;
 294         }
 295
 296         if (*sensitivity != 0 && value == 0 && lnet_retry_count != 0) {
 297                 lnet_retry_count = 0;
 298                 lnet_set_lnd_timeout();
 299         }
 300
 301         *sensitivity = value;
 302
 303         mutex_unlock(&the_lnet.ln_api_mutex);
 304
 305         return 0;
 306 }
 307
 308 static int
 309 recovery_interval_set(const char *val, cfs_kernel_param_arg_t *kp)
 310 {
 311         CWARN("'lnet_recovery_interval' has been deprecated\n");
 312
 313         return 0;
 314 }
 315
 316 static int
 317 discovery_set(const char *val, cfs_kernel_param_arg_t *kp)
 318 {
 319         int rc;
 320         unsigned *discovery_off = (unsigned *)kp->arg;
 321         unsigned long value;
 322         struct lnet_ping_buffer *pbuf;
 323
 324         rc = kstrtoul(val, 0, &value);
 325         if (rc) {
 326                 CERROR("Invalid module parameter value for 'lnet_peer_discovery_disabled'\n");
 327                 return rc;
 328         }
 329
 330         value = (value) ? 1 : 0;
 331
 332         /*
 333          * The purpose of locking the api_mutex here is to ensure that
 334          * the correct value ends up stored properly.
 335          */
 336         mutex_lock(&the_lnet.ln_api_mutex);
 337
 338         if (value == *discovery_off) {
 339                 mutex_unlock(&the_lnet.ln_api_mutex);
 340                 return 0;
 341         }
 342
 343         /*
 344          * We still want to set the discovery value even when LNet is not
 345          * running. This is the case when LNet is being loaded and we want
 346          * the module parameters to take effect. Otherwise if we're
 347          * changing the value dynamically, we want to set it after
 348          * updating the peers
 349          */
 350         if (the_lnet.ln_state != LNET_STATE_RUNNING) {
 351                 *discovery_off = value;
 352                 mutex_unlock(&the_lnet.ln_api_mutex);
 353                 return 0;
 354         }
 355
 356         /* tell peers that discovery setting has changed */
 357         lnet_net_lock(LNET_LOCK_EX);
 358         pbuf = the_lnet.ln_ping_target;
 359         if (value)
 360                 pbuf->pb_info.pi_features &= ~LNET_PING_FEAT_DISCOVERY;
 361         else
 362                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
 363         lnet_net_unlock(LNET_LOCK_EX);
 364
 365         /* only send a push when we're turning off discovery */
 366         if (*discovery_off <= 0 && value > 0)
 367                 lnet_push_update_to_peers(1);
 368         *discovery_off = value;
 369
 370         mutex_unlock(&the_lnet.ln_api_mutex);
 371
 372         return 0;
 373 }
 374
 375 static int
 376 drop_asym_route_set(const char *val, cfs_kernel_param_arg_t *kp)
 377 {
 378         int rc;
 379         unsigned int *drop_asym_route = (unsigned int *)kp->arg;
 380         unsigned long value;
 381
 382         rc = kstrtoul(val, 0, &value);
 383         if (rc) {
 384                 CERROR("Invalid module parameter value for "
 385                        "'lnet_drop_asym_route'\n");
 386                 return rc;
 387         }
 388
 389         /*
 390          * The purpose of locking the api_mutex here is to ensure that
 391          * the correct value ends up stored properly.
 392          */
 393         mutex_lock(&the_lnet.ln_api_mutex);
 394
 395         if (value == *drop_asym_route) {
 396                 mutex_unlock(&the_lnet.ln_api_mutex);
 397                 return 0;
 398         }
 399
 400         *drop_asym_route = value;
 401
 402         mutex_unlock(&the_lnet.ln_api_mutex);
 403
 404         return 0;
 405 }
 406
 407 static int
 408 transaction_to_set(const char *val, cfs_kernel_param_arg_t *kp)
 409 {
 410         int rc;
 411         unsigned *transaction_to = (unsigned *)kp->arg;
 412         unsigned long value;
 413
 414         rc = kstrtoul(val, 0, &value);
 415         if (rc) {
 416                 CERROR("Invalid module parameter value for 'lnet_transaction_timeout'\n");
 417                 return rc;
 418         }
 419
 420         /*
 421          * The purpose of locking the api_mutex here is to ensure that
 422          * the correct value ends up stored properly.
 423          */
 424         mutex_lock(&the_lnet.ln_api_mutex);
 425
 426         if (value <= lnet_retry_count || value == 0) {
 427                 mutex_unlock(&the_lnet.ln_api_mutex);
 428                 CERROR("Invalid value for lnet_transaction_timeout (%lu). "
 429                        "Has to be greater than lnet_retry_count (%u)\n",
 430                        value, lnet_retry_count);
 431                 return -EINVAL;
 432         }
 433
 434         if (value == *transaction_to) {
 435                 mutex_unlock(&the_lnet.ln_api_mutex);
 436                 return 0;
 437         }
 438
 439         *transaction_to = value;
 440         /* Update the lnet_lnd_timeout now that we've modified the
 441          * transaction timeout
 442          */
 443         lnet_set_lnd_timeout();
 444
 445         mutex_unlock(&the_lnet.ln_api_mutex);
 446
 447         return 0;
 448 }
 449
 450 static int
 451 retry_count_set(const char *val, cfs_kernel_param_arg_t *kp)
 452 {
 453         int rc;
 454         unsigned *retry_count = (unsigned *)kp->arg;
 455         unsigned long value;
 456
 457         rc = kstrtoul(val, 0, &value);
 458         if (rc) {
 459                 CERROR("Invalid module parameter value for 'lnet_retry_count'\n");
 460                 return rc;
 461         }
 462
 463         /*
 464          * The purpose of locking the api_mutex here is to ensure that
 465          * the correct value ends up stored properly.
 466          */
 467         mutex_lock(&the_lnet.ln_api_mutex);
 468
 469         if (lnet_health_sensitivity == 0 && value > 0) {
 470                 mutex_unlock(&the_lnet.ln_api_mutex);
 471                 CERROR("Can not set lnet_retry_count when health feature is turned off\n");
 472                 return -EINVAL;
 473         }
 474
 475         if (value > lnet_transaction_timeout) {
 476                 mutex_unlock(&the_lnet.ln_api_mutex);
 477                 CERROR("Invalid value for lnet_retry_count (%lu). "
 478                        "Has to be smaller than lnet_transaction_timeout (%u)\n",
 479                        value, lnet_transaction_timeout);
 480                 return -EINVAL;
 481         }
 482
 483         *retry_count = value;
 484
 485         /* Update the lnet_lnd_timeout now that we've modified the
 486          * retry count
 487          */
 488         lnet_set_lnd_timeout();
 489
 490         mutex_unlock(&the_lnet.ln_api_mutex);
 491
 492         return 0;
 493 }
 494
 495 static int
 496 intf_max_set(const char *val, cfs_kernel_param_arg_t *kp)
 497 {
 498         int value, rc;
 499
 500         rc = kstrtoint(val, 0, &value);
 501         if (rc) {
 502                 CERROR("Invalid module parameter value for 'lnet_interfaces_max'\n");
 503                 return rc;
 504         }
 505
 506         if (value < LNET_INTERFACES_MIN) {
 507                 CWARN("max interfaces provided are too small, setting to %d\n",
 508                       LNET_INTERFACES_MAX_DEFAULT);
 509                 value = LNET_INTERFACES_MAX_DEFAULT;
 510         }
 511
 512         *(int *)kp->arg = value;
 513
 514         return 0;
 515 }
 516
 517 static int
 518 response_tracking_set(const char *val, cfs_kernel_param_arg_t *kp)
 519 {
 520         int rc;
 521         unsigned long new_value;
 522
 523         rc = kstrtoul(val, 0, &new_value);
 524         if (rc) {
 525                 CERROR("Invalid value for 'lnet_response_tracking'\n");
 526                 return -EINVAL;
 527         }
 528
 529         if (new_value < 0 || new_value > 3) {
 530                 CWARN("Invalid value (%lu) for 'lnet_response_tracking'\n",
 531                       new_value);
 532                 return -EINVAL;
 533         }
 534
 535         lnet_response_tracking = new_value;
 536
 537         return 0;
 538 }
 539
 540 static const char *
 541 lnet_get_routes(void)
 542 {
 543         return routes;
 544 }
 545
 546 static const char *
 547 lnet_get_networks(void)
 548 {
 549         const char *nets;
 550         int rc;
 551
 552         if (*networks != 0 && *ip2nets != 0) {
 553                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
 554                                    "'ip2nets' but not both at once\n");
 555                 return NULL;
 556         }
 557
 558         if (*ip2nets != 0) {
 559                 rc = lnet_parse_ip2nets(&nets, ip2nets);
 560                 return (rc == 0) ? nets : NULL;
 561         }
 562
 563         if (*networks != 0)
 564                 return networks;
 565
 566         return "tcp";
 567 }
 568
 569 static void
 570 lnet_init_locks(void)
 571 {
 572         spin_lock_init(&the_lnet.ln_eq_wait_lock);
 573         spin_lock_init(&the_lnet.ln_msg_resend_lock);
 574         init_completion(&the_lnet.ln_mt_wait_complete);
 575         mutex_init(&the_lnet.ln_lnd_mutex);
 576 }
 577
 578 struct kmem_cache *lnet_mes_cachep;        /* MEs kmem_cache */
 579 struct kmem_cache *lnet_small_mds_cachep;  /* <= LNET_SMALL_MD_SIZE bytes
 580                                             *  MDs kmem_cache */
 581 struct kmem_cache *lnet_udsp_cachep;       /* udsp cache */
 582 struct kmem_cache *lnet_rspt_cachep;       /* response tracker cache */
 583 struct kmem_cache *lnet_msg_cachep;
 584
 585 static int
 586 lnet_slab_setup(void)
 587 {
 588         /* create specific kmem_cache for MEs and small MDs (i.e., originally
 589          * allocated in <size-xxx> kmem_cache).
 590          */
 591         lnet_mes_cachep = kmem_cache_create("lnet_MEs", sizeof(struct lnet_me),
 592                                             0, 0, NULL);
 593         if (!lnet_mes_cachep)
 594                 return -ENOMEM;
 595
 596         lnet_small_mds_cachep = kmem_cache_create("lnet_small_MDs",
 597                                                   LNET_SMALL_MD_SIZE, 0, 0,
 598                                                   NULL);
 599         if (!lnet_small_mds_cachep)
 600                 return -ENOMEM;
 601
 602         lnet_udsp_cachep = kmem_cache_create("lnet_udsp",
 603                                              sizeof(struct lnet_udsp),
 604                                              0, 0, NULL);
 605         if (!lnet_udsp_cachep)
 606                 return -ENOMEM;
 607
 608         lnet_rspt_cachep = kmem_cache_create("lnet_rspt", sizeof(struct lnet_rsp_tracker),
 609                                             0, 0, NULL);
 610         if (!lnet_rspt_cachep)
 611                 return -ENOMEM;
 612
 613         lnet_msg_cachep = kmem_cache_create("lnet_msg", sizeof(struct lnet_msg),
 614                                             0, 0, NULL);
 615         if (!lnet_msg_cachep)
 616                 return -ENOMEM;
 617
 618         return 0;
 619 }
 620
 621 static void
 622 lnet_slab_cleanup(void)
 623 {
 624         if (lnet_msg_cachep) {
 625                 kmem_cache_destroy(lnet_msg_cachep);
 626                 lnet_msg_cachep = NULL;
 627         }
 628
 629         if (lnet_rspt_cachep) {
 630                 kmem_cache_destroy(lnet_rspt_cachep);
 631                 lnet_rspt_cachep = NULL;
 632         }
 633
 634         if (lnet_udsp_cachep) {
 635                 kmem_cache_destroy(lnet_udsp_cachep);
 636                 lnet_udsp_cachep = NULL;
 637         }
 638
 639         if (lnet_small_mds_cachep) {
 640                 kmem_cache_destroy(lnet_small_mds_cachep);
 641                 lnet_small_mds_cachep = NULL;
 642         }
 643
 644         if (lnet_mes_cachep) {
 645                 kmem_cache_destroy(lnet_mes_cachep);
 646                 lnet_mes_cachep = NULL;
 647         }
 648 }
 649
 650 static int
 651 lnet_create_remote_nets_table(void)
 652 {
 653         int               i;
 654         struct list_head *hash;
 655
 656         LASSERT(the_lnet.ln_remote_nets_hash == NULL);
 657         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 658         CFS_ALLOC_PTR_ARRAY(hash, LNET_REMOTE_NETS_HASH_SIZE);
 659         if (hash == NULL) {
 660                 CERROR("Failed to create remote nets hash table\n");
 661                 return -ENOMEM;
 662         }
 663
 664         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 665                 INIT_LIST_HEAD(&hash[i]);
 666         the_lnet.ln_remote_nets_hash = hash;
 667         return 0;
 668 }
 669
 670 static void
 671 lnet_destroy_remote_nets_table(void)
 672 {
 673         int i;
 674
 675         if (the_lnet.ln_remote_nets_hash == NULL)
 676                 return;
 677
 678         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 679                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 680
 681         CFS_FREE_PTR_ARRAY(the_lnet.ln_remote_nets_hash,
 682                            LNET_REMOTE_NETS_HASH_SIZE);
 683         the_lnet.ln_remote_nets_hash = NULL;
 684 }
 685
 686 static void
 687 lnet_destroy_locks(void)
 688 {
 689         if (the_lnet.ln_res_lock != NULL) {
 690                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 691                 the_lnet.ln_res_lock = NULL;
 692         }
 693
 694         if (the_lnet.ln_net_lock != NULL) {
 695                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 696                 the_lnet.ln_net_lock = NULL;
 697         }
 698 }
 699
 700 static int
 701 lnet_create_locks(void)
 702 {
 703         lnet_init_locks();
 704
 705         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 706         if (the_lnet.ln_res_lock == NULL)
 707                 goto failed;
 708
 709         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 710         if (the_lnet.ln_net_lock == NULL)
 711                 goto failed;
 712
 713         return 0;
 714
 715  failed:
 716         lnet_destroy_locks();
 717         return -ENOMEM;
 718 }
 719
 720 static void lnet_assert_wire_constants(void)
 721 {
 722         /* Wire protocol assertions generated by 'wirecheck'
 723          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 724          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 725          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7)
 726          */
 727
 728         /* Constants... */
 729         BUILD_BUG_ON(LNET_PROTO_TCP_MAGIC != 0xeebc0ded);
 730         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MAJOR != 1);
 731         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MINOR != 0);
 732         BUILD_BUG_ON(LNET_MSG_ACK != 0);
 733         BUILD_BUG_ON(LNET_MSG_PUT != 1);
 734         BUILD_BUG_ON(LNET_MSG_GET != 2);
 735         BUILD_BUG_ON(LNET_MSG_REPLY != 3);
 736         BUILD_BUG_ON(LNET_MSG_HELLO != 4);
 737
 738         BUILD_BUG_ON((int)sizeof(lnet_nid_t) != 8);
 739         BUILD_BUG_ON((int)sizeof(lnet_pid_t) != 4);
 740
 741         /* Checks for struct lnet_process_id_packed */
 742         BUILD_BUG_ON((int)sizeof(struct lnet_process_id_packed) != 12);
 743         BUILD_BUG_ON((int)offsetof(struct lnet_process_id_packed, nid) != 0);
 744         BUILD_BUG_ON((int)sizeof(((struct lnet_process_id_packed *)0)->nid) != 8);
 745         BUILD_BUG_ON((int)offsetof(struct lnet_process_id_packed, pid) != 8);
 746         BUILD_BUG_ON((int)sizeof(((struct lnet_process_id_packed *)0)->pid) != 4);
 747
 748         /* Checks for struct lnet_handle_wire */
 749         BUILD_BUG_ON((int)sizeof(struct lnet_handle_wire) != 16);
 750         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 751                                    wh_interface_cookie) != 0);
 752         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_interface_cookie) != 8);
 753         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire,
 754                                    wh_object_cookie) != 8);
 755         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_object_cookie) != 8);
 756
 757         /* Checks for struct struct lnet_magicversion */
 758         BUILD_BUG_ON((int)sizeof(struct lnet_magicversion) != 8);
 759         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, magic) != 0);
 760         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->magic) != 4);
 761         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, version_major) != 4);
 762         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_major) != 2);
 763         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion,
 764                                    version_minor) != 6);
 765         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_minor) != 2);
 766
 767         /* Checks for struct struct lnet_hdr */
 768         BUILD_BUG_ON((int)sizeof(struct lnet_hdr) != 72);
 769         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_nid) != 0);
 770         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_nid) != 8);
 771         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_nid) != 8);
 772         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_nid) != 8);
 773         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_pid) != 16);
 774         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_pid) != 4);
 775         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_pid) != 20);
 776         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_pid) != 4);
 777         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, type) != 24);
 778         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->type) != 4);
 779         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, payload_length) != 28);
 780         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->payload_length) != 4);
 781         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg) != 32);
 782         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg) != 40);
 783
 784         /* Ack */
 785         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.dst_wmd) != 32);
 786         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.dst_wmd) != 16);
 787         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.match_bits) != 48);
 788         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.match_bits) != 8);
 789         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.mlength) != 56);
 790         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.mlength) != 4);
 791
 792         /* Put */
 793         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ack_wmd) != 32);
 794         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ack_wmd) != 16);
 795         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.match_bits) != 48);
 796         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.match_bits) != 8);
 797         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.hdr_data) != 56);
 798         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.hdr_data) != 8);
 799         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ptl_index) != 64);
 800         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ptl_index) != 4);
 801         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.offset) != 68);
 802         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.offset) != 4);
 803
 804         /* Get */
 805         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.return_wmd) != 32);
 806         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.return_wmd) != 16);
 807         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.match_bits) != 48);
 808         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.match_bits) != 8);
 809         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.ptl_index) != 56);
 810         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.ptl_index) != 4);
 811         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.src_offset) != 60);
 812         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.src_offset) != 4);
 813         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.sink_length) != 64);
 814         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.sink_length) != 4);
 815
 816         /* Reply */
 817         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.reply.dst_wmd) != 32);
 818         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.reply.dst_wmd) != 16);
 819
 820         /* Hello */
 821         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.incarnation) != 32);
 822         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.incarnation) != 8);
 823         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.type) != 40);
 824         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.type) != 4);
 825
 826         /* Checks for struct lnet_ni_status and related constants */
 827         BUILD_BUG_ON(LNET_NI_STATUS_INVALID != 0x00000000);
 828         BUILD_BUG_ON(LNET_NI_STATUS_UP != 0x15aac0de);
 829         BUILD_BUG_ON(LNET_NI_STATUS_DOWN != 0xdeadface);
 830
 831         /* Checks for struct lnet_ni_status */
 832         BUILD_BUG_ON((int)sizeof(struct lnet_ni_status) != 16);
 833         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_nid) != 0);
 834         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_nid) != 8);
 835         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_status) != 8);
 836         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_status) != 4);
 837         BUILD_BUG_ON((int)offsetof(struct lnet_ni_status, ns_unused) != 12);
 838         BUILD_BUG_ON((int)sizeof(((struct lnet_ni_status *)0)->ns_unused) != 4);
 839
 840         /* Checks for struct lnet_ping_info and related constants */
 841         BUILD_BUG_ON(LNET_PROTO_PING_MAGIC != 0x70696E67);
 842         BUILD_BUG_ON(LNET_PING_FEAT_INVAL != 0);
 843         BUILD_BUG_ON(LNET_PING_FEAT_BASE != 1);
 844         BUILD_BUG_ON(LNET_PING_FEAT_NI_STATUS != 2);
 845         BUILD_BUG_ON(LNET_PING_FEAT_RTE_DISABLED != 4);
 846         BUILD_BUG_ON(LNET_PING_FEAT_MULTI_RAIL != 8);
 847         BUILD_BUG_ON(LNET_PING_FEAT_DISCOVERY != 16);
 848         BUILD_BUG_ON(LNET_PING_FEAT_BITS != 31);
 849
 850         /* Checks for struct lnet_ping_info */
 851         BUILD_BUG_ON((int)sizeof(struct lnet_ping_info) != 16);
 852         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_magic) != 0);
 853         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_magic) != 4);
 854         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_features) != 4);
 855         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_features) != 4);
 856         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_pid) != 8);
 857         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_pid) != 4);
 858         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_nnis) != 12);
 859         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_nnis) != 4);
 860         BUILD_BUG_ON((int)offsetof(struct lnet_ping_info, pi_ni) != 16);
 861         BUILD_BUG_ON((int)sizeof(((struct lnet_ping_info *)0)->pi_ni) != 0);
 862
 863         /* Acceptor connection request */
 864         BUILD_BUG_ON(LNET_PROTO_ACCEPTOR_VERSION != 1);
 865
 866         /* Checks for struct lnet_acceptor_connreq */
 867         BUILD_BUG_ON((int)sizeof(struct lnet_acceptor_connreq) != 16);
 868         BUILD_BUG_ON((int)offsetof(struct lnet_acceptor_connreq, acr_magic) != 0);
 869         BUILD_BUG_ON((int)sizeof(((struct lnet_acceptor_connreq *)0)->acr_magic) != 4);
 870         BUILD_BUG_ON((int)offsetof(struct lnet_acceptor_connreq, acr_version) != 4);
 871         BUILD_BUG_ON((int)sizeof(((struct lnet_acceptor_connreq *)0)->acr_version) != 4);
 872         BUILD_BUG_ON((int)offsetof(struct lnet_acceptor_connreq, acr_nid) != 8);
 873         BUILD_BUG_ON((int)sizeof(((struct lnet_acceptor_connreq *)0)->acr_nid) != 8);
 874
 875         /* Checks for struct lnet_counters_common */
 876         BUILD_BUG_ON((int)sizeof(struct lnet_counters_common) != 60);
 877         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_msgs_alloc) != 0);
 878         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_msgs_alloc) != 4);
 879         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_msgs_max) != 4);
 880         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_msgs_max) != 4);
 881         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_errors) != 8);
 882         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_errors) != 4);
 883         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_send_count) != 12);
 884         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_send_count) != 4);
 885         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_recv_count) != 16);
 886         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_recv_count) != 4);
 887         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_route_count) != 20);
 888         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_route_count) != 4);
 889         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_drop_count) != 24);
 890         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_drop_count) != 4);
 891         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_send_length) != 28);
 892         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_send_length) != 8);
 893         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_recv_length) != 36);
 894         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_recv_length) != 8);
 895         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_route_length) != 44);
 896         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_route_length) != 8);
 897         BUILD_BUG_ON((int)offsetof(struct lnet_counters_common, lcc_drop_length) != 52);
 898         BUILD_BUG_ON((int)sizeof(((struct lnet_counters_common *)0)->lcc_drop_length) != 8);
 899 }
 900
 901 static const struct lnet_lnd *lnet_find_lnd_by_type(__u32 type)
 902 {
 903         const struct lnet_lnd *lnd;
 904
 905         /* holding lnd mutex */
 906         if (type >= NUM_LNDS)
 907                 return NULL;
 908         lnd = the_lnet.ln_lnds[type];
 909         LASSERT(!lnd || lnd->lnd_type == type);
 910
 911         return lnd;
 912 }
 913
 914 unsigned int
 915 lnet_get_lnd_timeout(void)
 916 {
 917         return lnet_lnd_timeout;
 918 }
 919 EXPORT_SYMBOL(lnet_get_lnd_timeout);
 920
 921 void
 922 lnet_register_lnd(const struct lnet_lnd *lnd)
 923 {
 924         mutex_lock(&the_lnet.ln_lnd_mutex);
 925
 926         LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
 927         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 928
 929         the_lnet.ln_lnds[lnd->lnd_type] = lnd;
 930
 931         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 932
 933         mutex_unlock(&the_lnet.ln_lnd_mutex);
 934 }
 935 EXPORT_SYMBOL(lnet_register_lnd);
 936
 937 void
 938 lnet_unregister_lnd(const struct lnet_lnd *lnd)
 939 {
 940         mutex_lock(&the_lnet.ln_lnd_mutex);
 941
 942         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 943
 944         the_lnet.ln_lnds[lnd->lnd_type] = NULL;
 945         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 946
 947         mutex_unlock(&the_lnet.ln_lnd_mutex);
 948 }
 949 EXPORT_SYMBOL(lnet_unregister_lnd);
 950
 951 static void
 952 lnet_counters_get_common_locked(struct lnet_counters_common *common)
 953 {
 954         struct lnet_counters *ctr;
 955         int i;
 956
 957         /* FIXME !!! Their is no assert_lnet_net_locked() to ensure this
 958          * actually called under the protection of the lnet_net_lock.
 959          */
 960         memset(common, 0, sizeof(*common));
 961
 962         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 963                 common->lcc_msgs_max     += ctr->lct_common.lcc_msgs_max;
 964                 common->lcc_msgs_alloc   += ctr->lct_common.lcc_msgs_alloc;
 965                 common->lcc_errors       += ctr->lct_common.lcc_errors;
 966                 common->lcc_send_count   += ctr->lct_common.lcc_send_count;
 967                 common->lcc_recv_count   += ctr->lct_common.lcc_recv_count;
 968                 common->lcc_route_count  += ctr->lct_common.lcc_route_count;
 969                 common->lcc_drop_count   += ctr->lct_common.lcc_drop_count;
 970                 common->lcc_send_length  += ctr->lct_common.lcc_send_length;
 971                 common->lcc_recv_length  += ctr->lct_common.lcc_recv_length;
 972                 common->lcc_route_length += ctr->lct_common.lcc_route_length;
 973                 common->lcc_drop_length  += ctr->lct_common.lcc_drop_length;
 974         }
 975 }
 976
 977 void
 978 lnet_counters_get_common(struct lnet_counters_common *common)
 979 {
 980         lnet_net_lock(LNET_LOCK_EX);
 981         lnet_counters_get_common_locked(common);
 982         lnet_net_unlock(LNET_LOCK_EX);
 983 }
 984 EXPORT_SYMBOL(lnet_counters_get_common);
 985
 986 int
 987 lnet_counters_get(struct lnet_counters *counters)
 988 {
 989         struct lnet_counters *ctr;
 990         struct lnet_counters_health *health = &counters->lct_health;
 991         int i, rc = 0;
 992
 993         memset(counters, 0, sizeof(*counters));
 994
 995         lnet_net_lock(LNET_LOCK_EX);
 996
 997         if (the_lnet.ln_state != LNET_STATE_RUNNING)
 998                 GOTO(out_unlock, rc = -ENODEV);
 999
1000         lnet_counters_get_common_locked(&counters->lct_common);
1001
1002         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
1003                 health->lch_rst_alloc    += ctr->lct_health.lch_rst_alloc;
1004                 health->lch_resend_count += ctr->lct_health.lch_resend_count;
1005                 health->lch_response_timeout_count +=
1006                                 ctr->lct_health.lch_response_timeout_count;
1007                 health->lch_local_interrupt_count +=
1008                                 ctr->lct_health.lch_local_interrupt_count;
1009                 health->lch_local_dropped_count +=
1010                                 ctr->lct_health.lch_local_dropped_count;
1011                 health->lch_local_aborted_count +=
1012                                 ctr->lct_health.lch_local_aborted_count;
1013                 health->lch_local_no_route_count +=
1014                                 ctr->lct_health.lch_local_no_route_count;
1015                 health->lch_local_timeout_count +=
1016                                 ctr->lct_health.lch_local_timeout_count;
1017                 health->lch_local_error_count +=
1018                                 ctr->lct_health.lch_local_error_count;
1019                 health->lch_remote_dropped_count +=
1020                                 ctr->lct_health.lch_remote_dropped_count;
1021                 health->lch_remote_error_count +=
1022                                 ctr->lct_health.lch_remote_error_count;
1023                 health->lch_remote_timeout_count +=
1024                                 ctr->lct_health.lch_remote_timeout_count;
1025                 health->lch_network_timeout_count +=
1026                                 ctr->lct_health.lch_network_timeout_count;
1027         }
1028 out_unlock:
1029         lnet_net_unlock(LNET_LOCK_EX);
1030         return rc;
1031 }
1032 EXPORT_SYMBOL(lnet_counters_get);
1033
1034 void
1035 lnet_counters_reset(void)
1036 {
1037         struct lnet_counters *counters;
1038         int             i;
1039
1040         lnet_net_lock(LNET_LOCK_EX);
1041
1042         if (the_lnet.ln_state != LNET_STATE_RUNNING)
1043                 goto avoid_reset;
1044
1045         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
1046                 memset(counters, 0, sizeof(struct lnet_counters));
1047 avoid_reset:
1048         lnet_net_unlock(LNET_LOCK_EX);
1049 }
1050
1051 static char *
1052 lnet_res_type2str(int type)
1053 {
1054         switch (type) {
1055         default:
1056                 LBUG();
1057         case LNET_COOKIE_TYPE_MD:
1058                 return "MD";
1059         case LNET_COOKIE_TYPE_ME:
1060                 return "ME";
1061         case LNET_COOKIE_TYPE_EQ:
1062                 return "EQ";
1063         }
1064 }
1065
1066 static void
1067 lnet_res_container_cleanup(struct lnet_res_container *rec)
1068 {
1069         int     count = 0;
1070
1071         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
1072                 return;
1073
1074         while (!list_empty(&rec->rec_active)) {
1075                 struct list_head *e = rec->rec_active.next;
1076
1077                 list_del_init(e);
1078                 if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
1079                         lnet_md_free(list_entry(e, struct lnet_libmd, md_list));
1080
1081                 } else { /* NB: Active MEs should be attached on portals */
1082                         LBUG();
1083                 }
1084                 count++;
1085         }
1086
1087         if (count > 0) {
1088                 /* Found alive MD/ME/EQ, user really should unlink/free
1089                  * all of them before finalize LNet, but if someone didn't,
1090                  * we have to recycle garbage for him */
1091                 CERROR("%d active elements on exit of %s container\n",
1092                        count, lnet_res_type2str(rec->rec_type));
1093         }
1094
1095         if (rec->rec_lh_hash != NULL) {
1096                 CFS_FREE_PTR_ARRAY(rec->rec_lh_hash, LNET_LH_HASH_SIZE);
1097                 rec->rec_lh_hash = NULL;
1098         }
1099
1100         rec->rec_type = 0; /* mark it as finalized */
1101 }
1102
1103 static int
1104 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
1105 {
1106         int     rc = 0;
1107         int     i;
1108
1109         LASSERT(rec->rec_type == 0);
1110
1111         rec->rec_type = type;
1112         INIT_LIST_HEAD(&rec->rec_active);
1113
1114         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
1115
1116         /* Arbitrary choice of hash table size */
1117         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
1118                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
1119         if (rec->rec_lh_hash == NULL) {
1120                 rc = -ENOMEM;
1121                 goto out;
1122         }
1123
1124         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
1125                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
1126
1127         return 0;
1128
1129 out:
1130         CERROR("Failed to setup %s resource container\n",
1131                lnet_res_type2str(type));
1132         lnet_res_container_cleanup(rec);
1133         return rc;
1134 }
1135
1136 static void
1137 lnet_res_containers_destroy(struct lnet_res_container **recs)
1138 {
1139         struct lnet_res_container       *rec;
1140         int                             i;
1141
1142         cfs_percpt_for_each(rec, i, recs)
1143                 lnet_res_container_cleanup(rec);
1144
1145         cfs_percpt_free(recs);
1146 }
1147
1148 static struct lnet_res_container **
1149 lnet_res_containers_create(int type)
1150 {
1151         struct lnet_res_container       **recs;
1152         struct lnet_res_container       *rec;
1153         int                             rc;
1154         int                             i;
1155
1156         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
1157         if (recs == NULL) {
1158                 CERROR("Failed to allocate %s resource containers\n",
1159                        lnet_res_type2str(type));
1160                 return NULL;
1161         }
1162
1163         cfs_percpt_for_each(rec, i, recs) {
1164                 rc = lnet_res_container_setup(rec, i, type);
1165                 if (rc != 0) {
1166                         lnet_res_containers_destroy(recs);
1167                         return NULL;
1168                 }
1169         }
1170
1171         return recs;
1172 }
1173
1174 struct lnet_libhandle *
1175 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
1176 {
1177         /* ALWAYS called with lnet_res_lock held */
1178         struct list_head        *head;
1179         struct lnet_libhandle   *lh;
1180         unsigned int            hash;
1181
1182         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
1183                 return NULL;
1184
1185         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
1186         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
1187
1188         list_for_each_entry(lh, head, lh_hash_chain) {
1189                 if (lh->lh_cookie == cookie)
1190                         return lh;
1191         }
1192
1193         return NULL;
1194 }
1195
1196 void
1197 lnet_res_lh_initialize(struct lnet_res_container *rec,
1198                        struct lnet_libhandle *lh)
1199 {
1200         /* ALWAYS called with lnet_res_lock held */
1201         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
1202         unsigned int    hash;
1203
1204         lh->lh_cookie = rec->rec_lh_cookie;
1205         rec->rec_lh_cookie += 1 << ibits;
1206
1207         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
1208
1209         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
1210 }
1211
1212 struct list_head **
1213 lnet_create_array_of_queues(void)
1214 {
1215         struct list_head **qs;
1216         struct list_head *q;
1217         int i;
1218
1219         qs = cfs_percpt_alloc(lnet_cpt_table(),
1220                               sizeof(struct list_head));
1221         if (!qs) {
1222                 CERROR("Failed to allocate queues\n");
1223                 return NULL;
1224         }
1225
1226         cfs_percpt_for_each(q, i, qs)
1227                 INIT_LIST_HEAD(q);
1228
1229         return qs;
1230 }
1231
1232 static int lnet_unprepare(void);
1233
1234 static int
1235 lnet_prepare(lnet_pid_t requested_pid)
1236 {
1237         /* Prepare to bring up the network */
1238         struct lnet_res_container **recs;
1239         int                       rc = 0;
1240
1241         if (requested_pid == LNET_PID_ANY) {
1242                 /* Don't instantiate LNET just for me */
1243                 return -ENETDOWN;
1244         }
1245
1246         LASSERT(the_lnet.ln_refcount == 0);
1247
1248         the_lnet.ln_routing = 0;
1249
1250         LASSERT((requested_pid & LNET_PID_USERFLAG) == 0);
1251         the_lnet.ln_pid = requested_pid;
1252
1253         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
1254         INIT_LIST_HEAD(&the_lnet.ln_remote_peer_ni_list);
1255         INIT_LIST_HEAD(&the_lnet.ln_nets);
1256         INIT_LIST_HEAD(&the_lnet.ln_routers);
1257         INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
1258         INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
1259         INIT_LIST_HEAD(&the_lnet.ln_dc_request);
1260         INIT_LIST_HEAD(&the_lnet.ln_dc_working);
1261         INIT_LIST_HEAD(&the_lnet.ln_dc_expired);
1262         INIT_LIST_HEAD(&the_lnet.ln_mt_localNIRecovq);
1263         INIT_LIST_HEAD(&the_lnet.ln_mt_peerNIRecovq);
1264         INIT_LIST_HEAD(&the_lnet.ln_udsp_list);
1265         init_waitqueue_head(&the_lnet.ln_dc_waitq);
1266         the_lnet.ln_mt_handler = NULL;
1267         init_completion(&the_lnet.ln_started);
1268
1269         rc = lnet_slab_setup();
1270         if (rc != 0)
1271                 goto failed;
1272
1273         rc = lnet_create_remote_nets_table();
1274         if (rc != 0)
1275                 goto failed;
1276
1277         /*
1278          * NB the interface cookie in wire handles guards against delayed
1279          * replies and ACKs appearing valid after reboot.
1280          */
1281         the_lnet.ln_interface_cookie = ktime_get_real_ns();
1282
1283         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
1284                                                 sizeof(struct lnet_counters));
1285         if (the_lnet.ln_counters == NULL) {
1286                 CERROR("Failed to allocate counters for LNet\n");
1287                 rc = -ENOMEM;
1288                 goto failed;
1289         }
1290
1291         rc = lnet_peer_tables_create();
1292         if (rc != 0)
1293                 goto failed;
1294
1295         rc = lnet_msg_containers_create();
1296         if (rc != 0)
1297                 goto failed;
1298
1299         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
1300                                       LNET_COOKIE_TYPE_EQ);
1301         if (rc != 0)
1302                 goto failed;
1303
1304         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
1305         if (recs == NULL) {
1306                 rc = -ENOMEM;
1307                 goto failed;
1308         }
1309
1310         the_lnet.ln_md_containers = recs;
1311
1312         rc = lnet_portals_create();
1313         if (rc != 0) {
1314                 CERROR("Failed to create portals for LNet: %d\n", rc);
1315                 goto failed;
1316         }
1317
1318         the_lnet.ln_mt_zombie_rstqs = lnet_create_array_of_queues();
1319         if (!the_lnet.ln_mt_zombie_rstqs) {
1320                 rc = -ENOMEM;
1321                 goto failed;
1322         }
1323
1324         return 0;
1325
1326  failed:
1327         lnet_unprepare();
1328         return rc;
1329 }
1330
1331 static int
1332 lnet_unprepare (void)
1333 {
1334         /* NB no LNET_LOCK since this is the last reference.  All LND instances
1335          * have shut down already, so it is safe to unlink and free all
1336          * descriptors, even those that appear committed to a network op (eg MD
1337          * with non-zero pending count) */
1338
1339         lnet_fail_nid(LNET_NID_ANY, 0);
1340
1341         LASSERT(the_lnet.ln_refcount == 0);
1342         LASSERT(list_empty(&the_lnet.ln_test_peers));
1343         LASSERT(list_empty(&the_lnet.ln_nets));
1344
1345         if (the_lnet.ln_mt_zombie_rstqs) {
1346                 lnet_clean_zombie_rstqs();
1347                 the_lnet.ln_mt_zombie_rstqs = NULL;
1348         }
1349
1350         lnet_assert_handler_unused(the_lnet.ln_mt_handler);
1351         the_lnet.ln_mt_handler = NULL;
1352
1353         lnet_portals_destroy();
1354
1355         if (the_lnet.ln_md_containers != NULL) {
1356                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
1357                 the_lnet.ln_md_containers = NULL;
1358         }
1359
1360         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
1361
1362         lnet_msg_containers_destroy();
1363         lnet_peer_uninit();
1364         lnet_rtrpools_free(0);
1365
1366         if (the_lnet.ln_counters != NULL) {
1367                 cfs_percpt_free(the_lnet.ln_counters);
1368                 the_lnet.ln_counters = NULL;
1369         }
1370         lnet_destroy_remote_nets_table();
1371         lnet_udsp_destroy(true);
1372         lnet_slab_cleanup();
1373
1374         return 0;
1375 }
1376
1377 struct lnet_ni  *
1378 lnet_net2ni_locked(__u32 net_id, int cpt)
1379 {
1380         struct lnet_ni   *ni;
1381         struct lnet_net  *net;
1382
1383         LASSERT(cpt != LNET_LOCK_EX);
1384
1385         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1386                 if (net->net_id == net_id) {
1387                         ni = list_entry(net->net_ni_list.next, struct lnet_ni,
1388                                         ni_netlist);
1389                         return ni;
1390                 }
1391         }
1392
1393         return NULL;
1394 }
1395
1396 struct lnet_ni *
1397 lnet_net2ni_addref(__u32 net)
1398 {
1399         struct lnet_ni *ni;
1400
1401         lnet_net_lock(0);
1402         ni = lnet_net2ni_locked(net, 0);
1403         if (ni)
1404                 lnet_ni_addref_locked(ni, 0);
1405         lnet_net_unlock(0);
1406
1407         return ni;
1408 }
1409 EXPORT_SYMBOL(lnet_net2ni_addref);
1410
1411 struct lnet_net *
1412 lnet_get_net_locked(__u32 net_id)
1413 {
1414         struct lnet_net  *net;
1415
1416         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1417                 if (net->net_id == net_id)
1418                         return net;
1419         }
1420
1421         return NULL;
1422 }
1423
1424 void
1425 lnet_net_clr_pref_rtrs(struct lnet_net *net)
1426 {
1427         struct list_head zombies;
1428         struct lnet_nid_list *ne;
1429         struct lnet_nid_list *tmp;
1430
1431         INIT_LIST_HEAD(&zombies);
1432
1433         lnet_net_lock(LNET_LOCK_EX);
1434         list_splice_init(&net->net_rtr_pref_nids, &zombies);
1435         lnet_net_unlock(LNET_LOCK_EX);
1436
1437         list_for_each_entry_safe(ne, tmp, &zombies, nl_list) {
1438                 list_del_init(&ne->nl_list);
1439                 LIBCFS_FREE(ne, sizeof(*ne));
1440         }
1441 }
1442
1443 int
1444 lnet_net_add_pref_rtr(struct lnet_net *net,
1445                       lnet_nid_t gw_nid)
1446 __must_hold(&the_lnet.ln_api_mutex)
1447 {
1448         struct lnet_nid_list *ne;
1449
1450         /* This function is called with api_mutex held. When the api_mutex
1451          * is held the list can not be modified, as it is only modified as
1452          * a result of applying a UDSP and that happens under api_mutex
1453          * lock.
1454          */
1455         list_for_each_entry(ne, &net->net_rtr_pref_nids, nl_list) {
1456                 if (ne->nl_nid == gw_nid)
1457                         return -EEXIST;
1458         }
1459
1460         LIBCFS_ALLOC(ne, sizeof(*ne));
1461         if (!ne)
1462                 return -ENOMEM;
1463
1464         ne->nl_nid = gw_nid;
1465
1466         /* Lock the cpt to protect against addition and checks in the
1467          * selection algorithm
1468          */
1469         lnet_net_lock(LNET_LOCK_EX);
1470         list_add(&ne->nl_list, &net->net_rtr_pref_nids);
1471         lnet_net_unlock(LNET_LOCK_EX);
1472
1473         return 0;
1474 }
1475
1476 bool
1477 lnet_net_is_pref_rtr_locked(struct lnet_net *net, lnet_nid_t rtr_nid)
1478 {
1479         struct lnet_nid_list *ne;
1480
1481         CDEBUG(D_NET, "%s: rtr pref emtpy: %d\n",
1482                libcfs_net2str(net->net_id),
1483                list_empty(&net->net_rtr_pref_nids));
1484
1485         if (list_empty(&net->net_rtr_pref_nids))
1486                 return false;
1487
1488         list_for_each_entry(ne, &net->net_rtr_pref_nids, nl_list) {
1489                 CDEBUG(D_NET, "Comparing pref %s with gw %s\n",
1490                        libcfs_nid2str(ne->nl_nid),
1491                        libcfs_nid2str(rtr_nid));
1492                 if (rtr_nid == ne->nl_nid)
1493                         return true;
1494         }
1495
1496         return false;
1497 }
1498
1499 unsigned int
1500 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
1501 {
1502         __u64           key = nid;
1503         unsigned int    val;
1504
1505         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
1506
1507         if (number == 1)
1508                 return 0;
1509
1510         val = hash_long(key, LNET_CPT_BITS);
1511         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
1512         if (val < number)
1513                 return val;
1514
1515         return (unsigned int)(key + val + (val >> 1)) % number;
1516 }
1517
1518 int
1519 lnet_cpt_of_nid_locked(lnet_nid_t nid, struct lnet_ni *ni)
1520 {
1521         struct lnet_net *net;
1522
1523         /* must called with hold of lnet_net_lock */
1524         if (LNET_CPT_NUMBER == 1)
1525                 return 0; /* the only one */
1526
1527         /*
1528          * If NI is provided then use the CPT identified in the NI cpt
1529          * list if one exists. If one doesn't exist, then that NI is
1530          * associated with all CPTs and it follows that the net it belongs
1531          * to is implicitly associated with all CPTs, so just hash the nid
1532          * and return that.
1533          */
1534         if (ni != NULL) {
1535                 if (ni->ni_cpts != NULL)
1536                         return ni->ni_cpts[lnet_nid_cpt_hash(nid,
1537                                                              ni->ni_ncpts)];
1538                 else
1539                         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1540         }
1541
1542         /* no NI provided so look at the net */
1543         net = lnet_get_net_locked(LNET_NIDNET(nid));
1544
1545         if (net != NULL && net->net_cpts != NULL) {
1546                 return net->net_cpts[lnet_nid_cpt_hash(nid, net->net_ncpts)];
1547         }
1548
1549         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
1550 }
1551
1552 int
1553 lnet_cpt_of_nid(lnet_nid_t nid, struct lnet_ni *ni)
1554 {
1555         int     cpt;
1556         int     cpt2;
1557
1558         if (LNET_CPT_NUMBER == 1)
1559                 return 0; /* the only one */
1560
1561         cpt = lnet_net_lock_current();
1562
1563         cpt2 = lnet_cpt_of_nid_locked(nid, ni);
1564
1565         lnet_net_unlock(cpt);
1566
1567         return cpt2;
1568 }
1569 EXPORT_SYMBOL(lnet_cpt_of_nid);
1570
1571 int
1572 lnet_islocalnet_locked(__u32 net_id)
1573 {
1574         struct lnet_net *net;
1575         bool local;
1576
1577         net = lnet_get_net_locked(net_id);
1578
1579         local = net != NULL;
1580
1581         return local;
1582 }
1583
1584 int
1585 lnet_islocalnet(__u32 net_id)
1586 {
1587         int cpt;
1588         bool local;
1589
1590         cpt = lnet_net_lock_current();
1591
1592         local = lnet_islocalnet_locked(net_id);
1593
1594         lnet_net_unlock(cpt);
1595
1596         return local;
1597 }
1598
1599 struct lnet_ni  *
1600 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
1601 {
1602         struct lnet_net  *net;
1603         struct lnet_ni   *ni;
1604
1605         LASSERT(cpt != LNET_LOCK_EX);
1606
1607         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1608                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1609                         if (ni->ni_nid == nid)
1610                                 return ni;
1611                 }
1612         }
1613
1614         return NULL;
1615 }
1616
1617 struct lnet_ni *
1618 lnet_nid2ni_addref(lnet_nid_t nid)
1619 {
1620         struct lnet_ni *ni;
1621
1622         lnet_net_lock(0);
1623         ni = lnet_nid2ni_locked(nid, 0);
1624         if (ni)
1625                 lnet_ni_addref_locked(ni, 0);
1626         lnet_net_unlock(0);
1627
1628         return ni;
1629 }
1630 EXPORT_SYMBOL(lnet_nid2ni_addref);
1631
1632 int
1633 lnet_islocalnid(lnet_nid_t nid)
1634 {
1635         struct lnet_ni  *ni;
1636         int             cpt;
1637
1638         cpt = lnet_net_lock_current();
1639         ni = lnet_nid2ni_locked(nid, cpt);
1640         lnet_net_unlock(cpt);
1641
1642         return ni != NULL;
1643 }
1644
1645 int
1646 lnet_count_acceptor_nets(void)
1647 {
1648         /* Return the # of NIs that need the acceptor. */
1649         int              count = 0;
1650         struct lnet_net  *net;
1651         int              cpt;
1652
1653         cpt = lnet_net_lock_current();
1654         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1655                 /* all socklnd type networks should have the acceptor
1656                  * thread started */
1657                 if (net->net_lnd->lnd_accept != NULL)
1658                         count++;
1659         }
1660
1661         lnet_net_unlock(cpt);
1662
1663         return count;
1664 }
1665
1666 struct lnet_ping_buffer *
1667 lnet_ping_buffer_alloc(int nnis, gfp_t gfp)
1668 {
1669         struct lnet_ping_buffer *pbuf;
1670
1671         LIBCFS_ALLOC_GFP(pbuf, LNET_PING_BUFFER_SIZE(nnis), gfp);
1672         if (pbuf) {
1673                 pbuf->pb_nnis = nnis;
1674                 pbuf->pb_needs_post = false;
1675                 atomic_set(&pbuf->pb_refcnt, 1);
1676         }
1677
1678         return pbuf;
1679 }
1680
1681 void
1682 lnet_ping_buffer_free(struct lnet_ping_buffer *pbuf)
1683 {
1684         LASSERT(atomic_read(&pbuf->pb_refcnt) == 0);
1685         LIBCFS_FREE(pbuf, LNET_PING_BUFFER_SIZE(pbuf->pb_nnis));
1686 }
1687
1688 static struct lnet_ping_buffer *
1689 lnet_ping_target_create(int nnis)
1690 {
1691         struct lnet_ping_buffer *pbuf;
1692
1693         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
1694         if (pbuf == NULL) {
1695                 CERROR("Can't allocate ping source [%d]\n", nnis);
1696                 return NULL;
1697         }
1698
1699         pbuf->pb_info.pi_nnis = nnis;
1700         pbuf->pb_info.pi_pid = the_lnet.ln_pid;
1701         pbuf->pb_info.pi_magic = LNET_PROTO_PING_MAGIC;
1702         pbuf->pb_info.pi_features =
1703                 LNET_PING_FEAT_NI_STATUS | LNET_PING_FEAT_MULTI_RAIL;
1704
1705         return pbuf;
1706 }
1707
1708 static inline int
1709 lnet_get_net_ni_count_locked(struct lnet_net *net)
1710 {
1711         struct lnet_ni  *ni;
1712         int             count = 0;
1713
1714         list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1715                 count++;
1716
1717         return count;
1718 }
1719
1720 static inline int
1721 lnet_get_net_ni_count_pre(struct lnet_net *net)
1722 {
1723         struct lnet_ni  *ni;
1724         int             count = 0;
1725
1726         list_for_each_entry(ni, &net->net_ni_added, ni_netlist)
1727                 count++;
1728
1729         return count;
1730 }
1731
1732 static inline int
1733 lnet_get_ni_count(void)
1734 {
1735         struct lnet_ni  *ni;
1736         struct lnet_net *net;
1737         int             count = 0;
1738
1739         lnet_net_lock(0);
1740
1741         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1742                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
1743                         count++;
1744         }
1745
1746         lnet_net_unlock(0);
1747
1748         return count;
1749 }
1750
1751 void
1752 lnet_swap_pinginfo(struct lnet_ping_buffer *pbuf)
1753 {
1754         struct lnet_ni_status *stat;
1755         int nnis;
1756         int i;
1757
1758         __swab32s(&pbuf->pb_info.pi_magic);
1759         __swab32s(&pbuf->pb_info.pi_features);
1760         __swab32s(&pbuf->pb_info.pi_pid);
1761         __swab32s(&pbuf->pb_info.pi_nnis);
1762         nnis = pbuf->pb_info.pi_nnis;
1763         if (nnis > pbuf->pb_nnis)
1764                 nnis = pbuf->pb_nnis;
1765         for (i = 0; i < nnis; i++) {
1766                 stat = &pbuf->pb_info.pi_ni[i];
1767                 __swab64s(&stat->ns_nid);
1768                 __swab32s(&stat->ns_status);
1769         }
1770 }
1771
1772 int
1773 lnet_ping_info_validate(struct lnet_ping_info *pinfo)
1774 {
1775         if (!pinfo)
1776                 return -EINVAL;
1777         if (pinfo->pi_magic != LNET_PROTO_PING_MAGIC)
1778                 return -EPROTO;
1779         if (!(pinfo->pi_features & LNET_PING_FEAT_NI_STATUS))
1780                 return -EPROTO;
1781         /* Loopback is guaranteed to be present */
1782         if (pinfo->pi_nnis < 1 || pinfo->pi_nnis > lnet_interfaces_max)
1783                 return -ERANGE;
1784         if (LNET_PING_INFO_LONI(pinfo) != LNET_NID_LO_0)
1785                 return -EPROTO;
1786         return 0;
1787 }
1788
1789 static void
1790 lnet_ping_target_destroy(void)
1791 {
1792         struct lnet_net *net;
1793         struct lnet_ni  *ni;
1794
1795         lnet_net_lock(LNET_LOCK_EX);
1796
1797         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1798                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1799                         lnet_ni_lock(ni);
1800                         ni->ni_status = NULL;
1801                         lnet_ni_unlock(ni);
1802                 }
1803         }
1804
1805         lnet_ping_buffer_decref(the_lnet.ln_ping_target);
1806         the_lnet.ln_ping_target = NULL;
1807
1808         lnet_net_unlock(LNET_LOCK_EX);
1809 }
1810
1811 static void
1812 lnet_ping_target_event_handler(struct lnet_event *event)
1813 {
1814         struct lnet_ping_buffer *pbuf = event->md_user_ptr;
1815
1816         if (event->unlinked)
1817                 lnet_ping_buffer_decref(pbuf);
1818 }
1819
1820 static int
1821 lnet_ping_target_setup(struct lnet_ping_buffer **ppbuf,
1822                        struct lnet_handle_md *ping_mdh,
1823                        int ni_count, bool set_eq)
1824 {
1825         struct lnet_process_id id = {
1826                 .nid = LNET_NID_ANY,
1827                 .pid = LNET_PID_ANY
1828         };
1829         struct lnet_me *me;
1830         struct lnet_md md = { NULL };
1831         int rc;
1832
1833         if (set_eq)
1834                 the_lnet.ln_ping_target_handler =
1835                         lnet_ping_target_event_handler;
1836
1837         *ppbuf = lnet_ping_target_create(ni_count);
1838         if (*ppbuf == NULL) {
1839                 rc = -ENOMEM;
1840                 goto fail_free_eq;
1841         }
1842
1843         /* Ping target ME/MD */
1844         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1845                           LNET_PROTO_PING_MATCHBITS, 0,
1846                           LNET_UNLINK, LNET_INS_AFTER);
1847         if (IS_ERR(me)) {
1848                 rc = PTR_ERR(me);
1849                 CERROR("Can't create ping target ME: %d\n", rc);
1850                 goto fail_decref_ping_buffer;
1851         }
1852
1853         /* initialize md content */
1854         md.start     = &(*ppbuf)->pb_info;
1855         md.length    = LNET_PING_INFO_SIZE((*ppbuf)->pb_nnis);
1856         md.threshold = LNET_MD_THRESH_INF;
1857         md.max_size  = 0;
1858         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1859                        LNET_MD_MANAGE_REMOTE;
1860         md.handler   = the_lnet.ln_ping_target_handler;
1861         md.user_ptr  = *ppbuf;
1862
1863         rc = LNetMDAttach(me, &md, LNET_RETAIN, ping_mdh);
1864         if (rc != 0) {
1865                 CERROR("Can't attach ping target MD: %d\n", rc);
1866                 goto fail_decref_ping_buffer;
1867         }
1868         lnet_ping_buffer_addref(*ppbuf);
1869
1870         return 0;
1871
1872 fail_decref_ping_buffer:
1873         LASSERT(atomic_read(&(*ppbuf)->pb_refcnt) == 1);
1874         lnet_ping_buffer_decref(*ppbuf);
1875         *ppbuf = NULL;
1876 fail_free_eq:
1877         return rc;
1878 }
1879
1880 static void
1881 lnet_ping_md_unlink(struct lnet_ping_buffer *pbuf,
1882                     struct lnet_handle_md *ping_mdh)
1883 {
1884         LNetMDUnlink(*ping_mdh);
1885         LNetInvalidateMDHandle(ping_mdh);
1886
1887         /* NB the MD could be busy; this just starts the unlink */
1888         wait_var_event_warning(&pbuf->pb_refcnt,
1889                                atomic_read(&pbuf->pb_refcnt) <= 1,
1890                                "Still waiting for ping data MD to unlink\n");
1891 }
1892
1893 static void
1894 lnet_ping_target_install_locked(struct lnet_ping_buffer *pbuf)
1895 {
1896         struct lnet_ni          *ni;
1897         struct lnet_net         *net;
1898         struct lnet_ni_status *ns;
1899         int                     i;
1900         int                     rc;
1901
1902         i = 0;
1903         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1904                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1905                         LASSERT(i < pbuf->pb_nnis);
1906
1907                         ns = &pbuf->pb_info.pi_ni[i];
1908
1909                         ns->ns_nid = ni->ni_nid;
1910
1911                         lnet_ni_lock(ni);
1912                         ns->ns_status = lnet_ni_get_status_locked(ni);
1913                         ni->ni_status = ns;
1914                         lnet_ni_unlock(ni);
1915
1916                         i++;
1917                 }
1918         }
1919         /*
1920          * We (ab)use the ns_status of the loopback interface to
1921          * transmit the sequence number. The first interface listed
1922          * must be the loopback interface.
1923          */
1924         rc = lnet_ping_info_validate(&pbuf->pb_info);
1925         if (rc) {
1926                 LCONSOLE_EMERG("Invalid ping target: %d\n", rc);
1927                 LBUG();
1928         }
1929         LNET_PING_BUFFER_SEQNO(pbuf) =
1930                 atomic_inc_return(&the_lnet.ln_ping_target_seqno);
1931 }
1932
1933 static void
1934 lnet_ping_target_update(struct lnet_ping_buffer *pbuf,
1935                         struct lnet_handle_md ping_mdh)
1936 {
1937         struct lnet_ping_buffer *old_pbuf = NULL;
1938         struct lnet_handle_md old_ping_md;
1939
1940         /* switch the NIs to point to the new ping info created */
1941         lnet_net_lock(LNET_LOCK_EX);
1942
1943         if (!the_lnet.ln_routing)
1944                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1945         if (!lnet_peer_discovery_disabled)
1946                 pbuf->pb_info.pi_features |= LNET_PING_FEAT_DISCOVERY;
1947
1948         /* Ensure only known feature bits have been set. */
1949         LASSERT(pbuf->pb_info.pi_features & LNET_PING_FEAT_BITS);
1950         LASSERT(!(pbuf->pb_info.pi_features & ~LNET_PING_FEAT_BITS));
1951
1952         lnet_ping_target_install_locked(pbuf);
1953
1954         if (the_lnet.ln_ping_target) {
1955                 old_pbuf = the_lnet.ln_ping_target;
1956                 old_ping_md = the_lnet.ln_ping_target_md;
1957         }
1958         the_lnet.ln_ping_target_md = ping_mdh;
1959         the_lnet.ln_ping_target = pbuf;
1960
1961         lnet_net_unlock(LNET_LOCK_EX);
1962
1963         if (old_pbuf) {
1964                 /* unlink and free the old ping info */
1965                 lnet_ping_md_unlink(old_pbuf, &old_ping_md);
1966                 lnet_ping_buffer_decref(old_pbuf);
1967         }
1968
1969         lnet_push_update_to_peers(0);
1970 }
1971
1972 static void
1973 lnet_ping_target_fini(void)
1974 {
1975         lnet_ping_md_unlink(the_lnet.ln_ping_target,
1976                             &the_lnet.ln_ping_target_md);
1977
1978         lnet_assert_handler_unused(the_lnet.ln_ping_target_handler);
1979         lnet_ping_target_destroy();
1980 }
1981
1982 /* Resize the push target. */
1983 int lnet_push_target_resize(void)
1984 {
1985         struct lnet_handle_md mdh;
1986         struct lnet_handle_md old_mdh;
1987         struct lnet_ping_buffer *pbuf;
1988         struct lnet_ping_buffer *old_pbuf;
1989         int nnis;
1990         int rc;
1991
1992 again:
1993         nnis = the_lnet.ln_push_target_nnis;
1994         if (nnis <= 0) {
1995                 CDEBUG(D_NET, "Invalid nnis %d\n", nnis);
1996                 return -EINVAL;
1997         }
1998
1999         /* NB: lnet_ping_buffer_alloc() sets pbuf refcount to 1. That ref is
2000          * dropped when we need to resize again (see "old_pbuf" below) or when
2001          * LNet is shutdown (see lnet_push_target_fini())
2002          */
2003         pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
2004         if (!pbuf) {
2005                 CDEBUG(D_NET, "Can't allocate pbuf for nnis %d\n", nnis);
2006                 return -ENOMEM;
2007         }
2008
2009         rc = lnet_push_target_post(pbuf, &mdh);
2010         if (rc) {
2011                 CDEBUG(D_NET, "Failed to post push target: %d\n", rc);
2012                 lnet_ping_buffer_decref(pbuf);
2013                 return rc;
2014         }
2015
2016         lnet_net_lock(LNET_LOCK_EX);
2017         old_pbuf = the_lnet.ln_push_target;
2018         old_mdh = the_lnet.ln_push_target_md;
2019         the_lnet.ln_push_target = pbuf;
2020         the_lnet.ln_push_target_md = mdh;
2021         lnet_net_unlock(LNET_LOCK_EX);
2022
2023         if (old_pbuf) {
2024                 LNetMDUnlink(old_mdh);
2025                 /* Drop ref set by lnet_ping_buffer_alloc() */
2026                 lnet_ping_buffer_decref(old_pbuf);
2027         }
2028
2029         /* Received another push or reply that requires a larger buffer */
2030         if (nnis < the_lnet.ln_push_target_nnis)
2031                 goto again;
2032
2033         CDEBUG(D_NET, "nnis %d success\n", nnis);
2034         return 0;
2035 }
2036
2037 int lnet_push_target_post(struct lnet_ping_buffer *pbuf,
2038                           struct lnet_handle_md *mdhp)
2039 {
2040         struct lnet_process_id id = { LNET_NID_ANY, LNET_PID_ANY };
2041         struct lnet_md md = { NULL };
2042         struct lnet_me *me;
2043         int rc;
2044
2045         me = LNetMEAttach(LNET_RESERVED_PORTAL, id,
2046                           LNET_PROTO_PING_MATCHBITS, 0,
2047                           LNET_UNLINK, LNET_INS_AFTER);
2048         if (IS_ERR(me)) {
2049                 rc = PTR_ERR(me);
2050                 CERROR("Can't create push target ME: %d\n", rc);
2051                 return rc;
2052         }
2053
2054         pbuf->pb_needs_post = false;
2055
2056         /* This reference is dropped by lnet_push_target_event_handler() */
2057         lnet_ping_buffer_addref(pbuf);
2058
2059         /* initialize md content */
2060         md.start     = &pbuf->pb_info;
2061         md.length    = LNET_PING_INFO_SIZE(pbuf->pb_nnis);
2062         md.threshold = 1;
2063         md.max_size  = 0;
2064         md.options   = LNET_MD_OP_PUT | LNET_MD_TRUNCATE;
2065         md.user_ptr  = pbuf;
2066         md.handler   = the_lnet.ln_push_target_handler;
2067
2068         rc = LNetMDAttach(me, &md, LNET_UNLINK, mdhp);
2069         if (rc) {
2070                 CERROR("Can't attach push MD: %d\n", rc);
2071                 lnet_ping_buffer_decref(pbuf);
2072                 pbuf->pb_needs_post = true;
2073                 return rc;
2074         }
2075
2076         CDEBUG(D_NET, "posted push target %p\n", pbuf);
2077
2078         return 0;
2079 }
2080
2081 static void lnet_push_target_event_handler(struct lnet_event *ev)
2082 {
2083         struct lnet_ping_buffer *pbuf = ev->md_user_ptr;
2084
2085         CDEBUG(D_NET, "type %d status %d unlinked %d\n", ev->type, ev->status,
2086                ev->unlinked);
2087
2088         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
2089                 lnet_swap_pinginfo(pbuf);
2090
2091         if (ev->type == LNET_EVENT_UNLINK) {
2092                 /* Drop ref added by lnet_push_target_post() */
2093                 lnet_ping_buffer_decref(pbuf);
2094                 return;
2095         }
2096
2097         lnet_peer_push_event(ev);
2098         if (ev->unlinked)
2099                 /* Drop ref added by lnet_push_target_post */
2100                 lnet_ping_buffer_decref(pbuf);
2101 }
2102
2103 /* Initialize the push target. */
2104 static int lnet_push_target_init(void)
2105 {
2106         int rc;
2107
2108         if (the_lnet.ln_push_target)
2109                 return -EALREADY;
2110
2111         the_lnet.ln_push_target_handler =
2112                 lnet_push_target_event_handler;
2113
2114         rc = LNetSetLazyPortal(LNET_RESERVED_PORTAL);
2115         LASSERT(rc == 0);
2116
2117         /* Start at the required minimum, we'll enlarge if required. */
2118         the_lnet.ln_push_target_nnis = LNET_INTERFACES_MIN;
2119
2120         rc = lnet_push_target_resize();
2121
2122         if (rc) {
2123                 LNetClearLazyPortal(LNET_RESERVED_PORTAL);
2124                 the_lnet.ln_push_target_handler = NULL;
2125         }
2126
2127         return rc;
2128 }
2129
2130 /* Clean up the push target. */
2131 static void lnet_push_target_fini(void)
2132 {
2133         if (!the_lnet.ln_push_target)
2134                 return;
2135
2136         /* Unlink and invalidate to prevent new references. */
2137         LNetMDUnlink(the_lnet.ln_push_target_md);
2138         LNetInvalidateMDHandle(&the_lnet.ln_push_target_md);
2139
2140         /* Wait for the unlink to complete. */
2141         wait_var_event_warning(&the_lnet.ln_push_target->pb_refcnt,
2142                                atomic_read(&the_lnet.ln_push_target->pb_refcnt) <= 1,
2143                                "Still waiting for ping data MD to unlink\n");
2144
2145         /* Drop ref set by lnet_ping_buffer_alloc() */
2146         lnet_ping_buffer_decref(the_lnet.ln_push_target);
2147         the_lnet.ln_push_target = NULL;
2148         the_lnet.ln_push_target_nnis = 0;
2149
2150         LNetClearLazyPortal(LNET_RESERVED_PORTAL);
2151         lnet_assert_handler_unused(the_lnet.ln_push_target_handler);
2152         the_lnet.ln_push_target_handler = NULL;
2153 }
2154
2155 static int
2156 lnet_ni_tq_credits(struct lnet_ni *ni)
2157 {
2158         int     credits;
2159
2160         LASSERT(ni->ni_ncpts >= 1);
2161
2162         if (ni->ni_ncpts == 1)
2163                 return ni->ni_net->net_tunables.lct_max_tx_credits;
2164
2165         credits = ni->ni_net->net_tunables.lct_max_tx_credits / ni->ni_ncpts;
2166         credits = max(credits, 8 * ni->ni_net->net_tunables.lct_peer_tx_credits);
2167         credits = min(credits, ni->ni_net->net_tunables.lct_max_tx_credits);
2168
2169         return credits;
2170 }
2171
2172 static void
2173 lnet_ni_unlink_locked(struct lnet_ni *ni)
2174 {
2175         /* move it to zombie list and nobody can find it anymore */
2176         LASSERT(!list_empty(&ni->ni_netlist));
2177         list_move(&ni->ni_netlist, &ni->ni_net->net_ni_zombie);
2178         lnet_ni_decref_locked(ni, 0);
2179 }
2180
2181 static void
2182 lnet_clear_zombies_nis_locked(struct lnet_net *net)
2183 {
2184         int             i;
2185         int             islo;
2186         struct lnet_ni  *ni;
2187         struct list_head *zombie_list = &net->net_ni_zombie;
2188
2189         /*
2190          * Now wait for the NIs I just nuked to show up on the zombie
2191          * list and shut them down in guaranteed thread context
2192          */
2193         i = 2;
2194         while (!list_empty(zombie_list)) {
2195                 int     *ref;
2196                 int     j;
2197
2198                 ni = list_entry(zombie_list->next,
2199                                 struct lnet_ni, ni_netlist);
2200                 list_del_init(&ni->ni_netlist);
2201                 /* the ni should be in deleting state. If it's not it's
2202                  * a bug */
2203                 LASSERT(ni->ni_state == LNET_NI_STATE_DELETING);
2204                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
2205                         if (*ref == 0)
2206                                 continue;
2207                         /* still busy, add it back to zombie list */
2208                         list_add(&ni->ni_netlist, zombie_list);
2209                         break;
2210                 }
2211
2212                 if (!list_empty(&ni->ni_netlist)) {
2213                         /* Unlock mutex while waiting to allow other
2214                          * threads to read the LNet state and fall through
2215                          * to avoid deadlock
2216                          */
2217                         lnet_net_unlock(LNET_LOCK_EX);
2218                         mutex_unlock(&the_lnet.ln_api_mutex);
2219
2220                         ++i;
2221                         if ((i & (-i)) == i) {
2222                                 CDEBUG(D_WARNING,
2223                                        "Waiting for zombie LNI %s\n",
2224                                        libcfs_nid2str(ni->ni_nid));
2225                         }
2226                         schedule_timeout_uninterruptible(cfs_time_seconds(1));
2227
2228                         mutex_lock(&the_lnet.ln_api_mutex);
2229                         lnet_net_lock(LNET_LOCK_EX);
2230                         continue;
2231                 }
2232
2233                 lnet_net_unlock(LNET_LOCK_EX);
2234
2235                 islo = ni->ni_net->net_lnd->lnd_type == LOLND;
2236
2237                 LASSERT(!in_interrupt());
2238                 /* Holding the mutex makes it safe for lnd_shutdown
2239                  * to call module_put(). Module unload cannot finish
2240                  * until lnet_unregister_lnd() completes, and that
2241                  * requires the mutex.
2242                  */
2243                 mutex_lock(&the_lnet.ln_lnd_mutex);
2244                 (net->net_lnd->lnd_shutdown)(ni);
2245                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2246
2247                 if (!islo)
2248                         CDEBUG(D_LNI, "Removed LNI %s\n",
2249                               libcfs_nid2str(ni->ni_nid));
2250
2251                 lnet_ni_free(ni);
2252                 i = 2;
2253                 lnet_net_lock(LNET_LOCK_EX);
2254         }
2255 }
2256
2257 /* shutdown down the NI and release refcount */
2258 static void
2259 lnet_shutdown_lndni(struct lnet_ni *ni)
2260 {
2261         int i;
2262         struct lnet_net *net = ni->ni_net;
2263
2264         lnet_net_lock(LNET_LOCK_EX);
2265         lnet_ni_lock(ni);
2266         ni->ni_state = LNET_NI_STATE_DELETING;
2267         lnet_ni_unlock(ni);
2268         lnet_ni_unlink_locked(ni);
2269         lnet_incr_dlc_seq();
2270         lnet_net_unlock(LNET_LOCK_EX);
2271
2272         /* clear messages for this NI on the lazy portal */
2273         for (i = 0; i < the_lnet.ln_nportals; i++)
2274                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
2275
2276         lnet_net_lock(LNET_LOCK_EX);
2277         lnet_clear_zombies_nis_locked(net);
2278         lnet_net_unlock(LNET_LOCK_EX);
2279 }
2280
2281 static void
2282 lnet_shutdown_lndnet(struct lnet_net *net)
2283 {
2284         struct lnet_ni *ni;
2285
2286         lnet_net_lock(LNET_LOCK_EX);
2287
2288         list_del_init(&net->net_list);
2289
2290         while (!list_empty(&net->net_ni_list)) {
2291                 ni = list_entry(net->net_ni_list.next,
2292                                 struct lnet_ni, ni_netlist);
2293                 lnet_net_unlock(LNET_LOCK_EX);
2294                 lnet_shutdown_lndni(ni);
2295                 lnet_net_lock(LNET_LOCK_EX);
2296         }
2297
2298         lnet_net_unlock(LNET_LOCK_EX);
2299
2300         /* Do peer table cleanup for this net */
2301         lnet_peer_tables_cleanup(net);
2302
2303         lnet_net_free(net);
2304 }
2305
2306 static void
2307 lnet_shutdown_lndnets(void)
2308 {
2309         struct lnet_net *net;
2310         LIST_HEAD(resend);
2311         struct lnet_msg *msg, *tmp;
2312
2313         /* NB called holding the global mutex */
2314
2315         /* All quiet on the API front */
2316         LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
2317         LASSERT(the_lnet.ln_refcount == 0);
2318
2319         lnet_net_lock(LNET_LOCK_EX);
2320         the_lnet.ln_state = LNET_STATE_STOPPING;
2321
2322         /*
2323          * move the nets to the zombie list to avoid them being
2324          * picked up for new work. LONET is also included in the
2325          * Nets that will be moved to the zombie list
2326          */
2327         list_splice_init(&the_lnet.ln_nets, &the_lnet.ln_net_zombie);
2328
2329         /* Drop the cached loopback Net. */
2330         if (the_lnet.ln_loni != NULL) {
2331                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
2332                 the_lnet.ln_loni = NULL;
2333         }
2334         lnet_net_unlock(LNET_LOCK_EX);
2335
2336         /* iterate through the net zombie list and delete each net */
2337         while (!list_empty(&the_lnet.ln_net_zombie)) {
2338                 net = list_entry(the_lnet.ln_net_zombie.next,
2339                                  struct lnet_net, net_list);
2340                 lnet_shutdown_lndnet(net);
2341         }
2342
2343         spin_lock(&the_lnet.ln_msg_resend_lock);
2344         list_splice(&the_lnet.ln_msg_resend, &resend);
2345         spin_unlock(&the_lnet.ln_msg_resend_lock);
2346
2347         list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
2348                 list_del_init(&msg->msg_list);
2349                 msg->msg_no_resend = true;
2350                 lnet_finalize(msg, -ECANCELED);
2351         }
2352
2353         lnet_net_lock(LNET_LOCK_EX);
2354         the_lnet.ln_state = LNET_STATE_SHUTDOWN;
2355         lnet_net_unlock(LNET_LOCK_EX);
2356 }
2357
2358 static int
2359 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_lnd_tunables *tun)
2360 {
2361         int                     rc = -EINVAL;
2362         struct lnet_tx_queue    *tq;
2363         int                     i;
2364         struct lnet_net         *net = ni->ni_net;
2365
2366         mutex_lock(&the_lnet.ln_lnd_mutex);
2367
2368         if (tun) {
2369                 memcpy(&ni->ni_lnd_tunables, tun, sizeof(*tun));
2370                 ni->ni_lnd_tunables_set = true;
2371         }
2372
2373         rc = (net->net_lnd->lnd_startup)(ni);
2374
2375         mutex_unlock(&the_lnet.ln_lnd_mutex);
2376
2377         if (rc != 0) {
2378                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
2379                                    rc, libcfs_lnd2str(net->net_lnd->lnd_type));
2380                 goto failed0;
2381         }
2382
2383         lnet_ni_lock(ni);
2384         ni->ni_state = LNET_NI_STATE_ACTIVE;
2385         lnet_ni_unlock(ni);
2386
2387         /* We keep a reference on the loopback net through the loopback NI */
2388         if (net->net_lnd->lnd_type == LOLND) {
2389                 lnet_ni_addref(ni);
2390                 LASSERT(the_lnet.ln_loni == NULL);
2391                 the_lnet.ln_loni = ni;
2392                 ni->ni_net->net_tunables.lct_peer_tx_credits = 0;
2393                 ni->ni_net->net_tunables.lct_peer_rtr_credits = 0;
2394                 ni->ni_net->net_tunables.lct_max_tx_credits = 0;
2395                 ni->ni_net->net_tunables.lct_peer_timeout = 0;
2396                 return 0;
2397         }
2398
2399         if (ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ||
2400             ni->ni_net->net_tunables.lct_max_tx_credits == 0) {
2401                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
2402                                    libcfs_lnd2str(net->net_lnd->lnd_type),
2403                                    ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ?
2404                                         "" : "per-peer ");
2405                 /* shutdown the NI since if we get here then it must've already
2406                  * been started
2407                  */
2408                 lnet_shutdown_lndni(ni);
2409                 return -EINVAL;
2410         }
2411
2412         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
2413                 tq->tq_credits_min =
2414                 tq->tq_credits_max =
2415                 tq->tq_credits = lnet_ni_tq_credits(ni);
2416         }
2417
2418         atomic_set(&ni->ni_tx_credits,
2419                    lnet_ni_tq_credits(ni) * ni->ni_ncpts);
2420         atomic_set(&ni->ni_healthv, LNET_MAX_HEALTH_VALUE);
2421
2422         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
2423                 libcfs_nid2str(ni->ni_nid),
2424                 ni->ni_net->net_tunables.lct_peer_tx_credits,
2425                 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
2426                 ni->ni_net->net_tunables.lct_peer_rtr_credits,
2427                 ni->ni_net->net_tunables.lct_peer_timeout);
2428
2429         return 0;
2430 failed0:
2431         lnet_ni_free(ni);
2432         return rc;
2433 }
2434
2435 static int
2436 lnet_startup_lndnet(struct lnet_net *net, struct lnet_lnd_tunables *tun)
2437 {
2438         struct lnet_ni *ni;
2439         struct lnet_net *net_l = NULL;
2440         LIST_HEAD(local_ni_list);
2441         int rc;
2442         int ni_count = 0;
2443         __u32 lnd_type;
2444         const struct lnet_lnd  *lnd;
2445         int peer_timeout =
2446                 net->net_tunables.lct_peer_timeout;
2447         int maxtxcredits =
2448                 net->net_tunables.lct_max_tx_credits;
2449         int peerrtrcredits =
2450                 net->net_tunables.lct_peer_rtr_credits;
2451
2452         /*
2453          * make sure that this net is unique. If it isn't then
2454          * we are adding interfaces to an already existing network, and
2455          * 'net' is just a convenient way to pass in the list.
2456          * if it is unique we need to find the LND and load it if
2457          * necessary.
2458          */
2459         if (lnet_net_unique(net->net_id, &the_lnet.ln_nets, &net_l)) {
2460                 lnd_type = LNET_NETTYP(net->net_id);
2461
2462                 mutex_lock(&the_lnet.ln_lnd_mutex);
2463                 lnd = lnet_find_lnd_by_type(lnd_type);
2464
2465                 if (lnd == NULL) {
2466                         mutex_unlock(&the_lnet.ln_lnd_mutex);
2467                         rc = request_module("%s", libcfs_lnd2modname(lnd_type));
2468                         mutex_lock(&the_lnet.ln_lnd_mutex);
2469
2470                         lnd = lnet_find_lnd_by_type(lnd_type);
2471                         if (lnd == NULL) {
2472                                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2473                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
2474                                 libcfs_lnd2str(lnd_type),
2475                                 libcfs_lnd2modname(lnd_type), rc);
2476 #ifndef HAVE_MODULE_LOADING_SUPPORT
2477                                 LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
2478                                                 "compiled with kernel module "
2479                                                 "loading support.");
2480 #endif
2481                                 rc = -EINVAL;
2482                                 goto failed0;
2483                         }
2484                 }
2485
2486                 net->net_lnd = lnd;
2487
2488                 mutex_unlock(&the_lnet.ln_lnd_mutex);
2489
2490                 net_l = net;
2491         }
2492
2493         /*
2494          * net_l: if the network being added is unique then net_l
2495          *        will point to that network
2496          *        if the network being added is not unique then
2497          *        net_l points to the existing network.
2498          *
2499          * When we enter the loop below, we'll pick NIs off he
2500          * network beign added and start them up, then add them to
2501          * a local ni list. Once we've successfully started all
2502          * the NIs then we join the local NI list (of started up
2503          * networks) with the net_l->net_ni_list, which should
2504          * point to the correct network to add the new ni list to
2505          *
2506          * If any of the new NIs fail to start up, then we want to
2507          * iterate through the local ni list, which should include
2508          * any NIs which were successfully started up, and shut
2509          * them down.
2510          *
2511          * After than we want to delete the network being added,
2512          * to avoid a memory leak.
2513          */
2514         while (!list_empty(&net->net_ni_added)) {
2515                 ni = list_entry(net->net_ni_added.next, struct lnet_ni,
2516                                 ni_netlist);
2517                 list_del_init(&ni->ni_netlist);
2518
2519                 /* make sure that the the NI we're about to start
2520                  * up is actually unique. if it's not fail. */
2521                 if (!lnet_ni_unique_net(&net_l->net_ni_list,
2522                                         ni->ni_interface)) {
2523                         rc = -EEXIST;
2524                         goto failed1;
2525                 }
2526
2527                 /* adjust the pointer the parent network, just in case it
2528                  * the net is a duplicate */
2529                 ni->ni_net = net_l;
2530
2531                 rc = lnet_startup_lndni(ni, tun);
2532
2533                 if (rc < 0)
2534                         goto failed1;
2535
2536                 lnet_ni_addref(ni);
2537                 list_add_tail(&ni->ni_netlist, &local_ni_list);
2538
2539                 ni_count++;
2540         }
2541
2542         lnet_net_lock(LNET_LOCK_EX);
2543         list_splice_tail(&local_ni_list, &net_l->net_ni_list);
2544         lnet_incr_dlc_seq();
2545         lnet_net_unlock(LNET_LOCK_EX);
2546
2547         /* if the network is not unique then we don't want to keep
2548          * it around after we're done. Free it. Otherwise add that
2549          * net to the global the_lnet.ln_nets */
2550         if (net_l != net && net_l != NULL) {
2551                 /*
2552                  * TODO - note. currently the tunables can not be updated
2553                  * once added
2554                  */
2555                 lnet_net_free(net);
2556         } else {
2557                 /*
2558                  * restore tunables after it has been overwitten by the
2559                  * lnd
2560                  */
2561                 if (peer_timeout != -1)
2562                         net->net_tunables.lct_peer_timeout = peer_timeout;
2563                 if (maxtxcredits != -1)
2564                         net->net_tunables.lct_max_tx_credits = maxtxcredits;
2565                 if (peerrtrcredits != -1)
2566                         net->net_tunables.lct_peer_rtr_credits = peerrtrcredits;
2567
2568                 lnet_net_lock(LNET_LOCK_EX);
2569                 list_add_tail(&net->net_list, &the_lnet.ln_nets);
2570                 lnet_net_unlock(LNET_LOCK_EX);
2571         }
2572
2573         return ni_count;
2574
2575 failed1:
2576         /*
2577          * shutdown the new NIs that are being started up
2578          * free the NET being started
2579          */
2580         while (!list_empty(&local_ni_list)) {
2581                 ni = list_entry(local_ni_list.next, struct lnet_ni,
2582                                 ni_netlist);
2583
2584                 lnet_shutdown_lndni(ni);
2585         }
2586
2587 failed0:
2588         lnet_net_free(net);
2589
2590         return rc;
2591 }
2592
2593 static int
2594 lnet_startup_lndnets(struct list_head *netlist)
2595 {
2596         struct lnet_net         *net;
2597         int                     rc;
2598         int                     ni_count = 0;
2599
2600         /*
2601          * Change to running state before bringing up the LNDs. This
2602          * allows lnet_shutdown_lndnets() to assert that we've passed
2603          * through here.
2604          */
2605         lnet_net_lock(LNET_LOCK_EX);
2606         the_lnet.ln_state = LNET_STATE_RUNNING;
2607         lnet_net_unlock(LNET_LOCK_EX);
2608
2609         while (!list_empty(netlist)) {
2610                 net = list_entry(netlist->next, struct lnet_net, net_list);
2611                 list_del_init(&net->net_list);
2612
2613                 rc = lnet_startup_lndnet(net, NULL);
2614
2615                 if (rc < 0)
2616                         goto failed;
2617
2618                 ni_count += rc;
2619         }
2620
2621         return ni_count;
2622 failed:
2623         lnet_shutdown_lndnets();
2624
2625         return rc;
2626 }
2627
2628 static int lnet_genl_parse_list(struct sk_buff *msg,
2629                                 const struct ln_key_list *data[], u16 idx)
2630 {
2631         const struct ln_key_list *list = data[idx];
2632         const struct ln_key_props *props;
2633         struct nlattr *node;
2634         u16 count;
2635
2636         if (!list)
2637                 return 0;
2638
2639         if (!list->lkl_maxattr)
2640                 return -ERANGE;
2641
2642         props = list->lkl_list;
2643         if (!props)
2644                 return -EINVAL;
2645
2646         node = nla_nest_start(msg, LN_SCALAR_ATTR_LIST);
2647         if (!node)
2648                 return -ENOBUFS;
2649
2650         for (count = 1; count <= list->lkl_maxattr; count++) {
2651                 struct nlattr *key = nla_nest_start(msg, count);
2652
2653                 if (count == 1)
2654                         nla_put_u16(msg, LN_SCALAR_ATTR_LIST_SIZE,
2655                                     list->lkl_maxattr);
2656
2657                 nla_put_u16(msg, LN_SCALAR_ATTR_INDEX, count);
2658                 if (props[count].lkp_values)
2659                         nla_put_string(msg, LN_SCALAR_ATTR_VALUE,
2660                                        props[count].lkp_values);
2661                 if (props[count].lkp_key_format)
2662                         nla_put_u16(msg, LN_SCALAR_ATTR_KEY_FORMAT,
2663                                     props[count].lkp_key_format);
2664                 nla_put_u16(msg, LN_SCALAR_ATTR_NLA_TYPE,
2665                             props[count].lkp_data_type);
2666                 if (props[count].lkp_data_type == NLA_NESTED) {
2667                         int rc;
2668
2669                         rc = lnet_genl_parse_list(msg, data, ++idx);
2670                         if (rc < 0)
2671                                 return rc;
2672                 }
2673
2674                 nla_nest_end(msg, key);
2675         }
2676
2677         nla_nest_end(msg, node);
2678         return 0;
2679 }
2680
2681 int lnet_genl_send_scalar_list(struct sk_buff *msg, u32 portid, u32 seq,
2682                                const struct genl_family *family, int flags,
2683                                u8 cmd, const struct ln_key_list *data[])
2684 {
2685         int rc = 0;
2686         void *hdr;
2687
2688         if (!data[0])
2689                 return -EINVAL;
2690
2691         hdr = genlmsg_put(msg, portid, seq, family, flags, cmd);
2692         if (!hdr)
2693                 GOTO(canceled, rc = -EMSGSIZE);
2694
2695         rc = lnet_genl_parse_list(msg, data, 0);
2696         if (rc < 0)
2697                 GOTO(canceled, rc);
2698
2699         genlmsg_end(msg, hdr);
2700 canceled:
2701         if (rc < 0)
2702                 genlmsg_cancel(msg, hdr);
2703         return rc;
2704 }
2705 EXPORT_SYMBOL(lnet_genl_send_scalar_list);
2706
2707 /**
2708  * Initialize LNet library.
2709  *
2710  * Automatically called at module loading time. Caller has to call
2711  * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
2712  * latter returned 0. It must be called exactly once.
2713  *
2714  * \retval 0 on success
2715  * \retval -ve on failures.
2716  */
2717 int lnet_lib_init(void)
2718 {
2719         int rc;
2720
2721         lnet_assert_wire_constants();
2722
2723         /* refer to global cfs_cpt_table for now */
2724         the_lnet.ln_cpt_table = cfs_cpt_tab;
2725         the_lnet.ln_cpt_number = cfs_cpt_number(cfs_cpt_tab);
2726
2727         LASSERT(the_lnet.ln_cpt_number > 0);
2728         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
2729                 /* we are under risk of consuming all lh_cookie */
2730                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
2731                        "please change setting of CPT-table and retry\n",
2732                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
2733                 return -E2BIG;
2734         }
2735
2736         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
2737                 the_lnet.ln_cpt_bits++;
2738
2739         rc = lnet_create_locks();
2740         if (rc != 0) {
2741                 CERROR("Can't create LNet global locks: %d\n", rc);
2742                 return rc;
2743         }
2744
2745         the_lnet.ln_refcount = 0;
2746         INIT_LIST_HEAD(&the_lnet.ln_net_zombie);
2747         INIT_LIST_HEAD(&the_lnet.ln_msg_resend);
2748
2749         /* The hash table size is the number of bits it takes to express the set
2750          * ln_num_routes, minus 1 (better to under estimate than over so we
2751          * don't waste memory). */
2752         if (rnet_htable_size <= 0)
2753                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
2754         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
2755                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
2756         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
2757                                            order_base_2(rnet_htable_size) - 1);
2758
2759         /* All LNDs apart from the LOLND are in separate modules.  They
2760          * register themselves when their module loads, and unregister
2761          * themselves when their module is unloaded. */
2762         lnet_register_lnd(&the_lolnd);
2763         return 0;
2764 }
2765
2766 /**
2767  * Finalize LNet library.
2768  *
2769  * \pre lnet_lib_init() called with success.
2770  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
2771  *
2772  * As this happens at module-unload, all lnds must already be unloaded,
2773  * so they must already be unregistered.
2774  */
2775 void lnet_lib_exit(void)
2776 {
2777         int i;
2778
2779         LASSERT(the_lnet.ln_refcount == 0);
2780         lnet_unregister_lnd(&the_lolnd);
2781         for (i = 0; i < NUM_LNDS; i++)
2782                 LASSERT(!the_lnet.ln_lnds[i]);
2783         lnet_destroy_locks();
2784 }
2785
2786 /**
2787  * Set LNet PID and start LNet interfaces, routing, and forwarding.
2788  *
2789  * Users must call this function at least once before any other functions.
2790  * For each successful call there must be a corresponding call to
2791  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
2792  * ignored.
2793  *
2794  * The PID used by LNet may be different from the one requested.
2795  * See LNetGetId().
2796  *
2797  * \param requested_pid PID requested by the caller.
2798  *
2799  * \return >= 0 on success, and < 0 error code on failures.
2800  */
2801 int
2802 LNetNIInit(lnet_pid_t requested_pid)
2803 {
2804         int                     im_a_router = 0;
2805         int                     rc;
2806         int                     ni_count;
2807         struct lnet_ping_buffer *pbuf;
2808         struct lnet_handle_md   ping_mdh;
2809         LIST_HEAD(net_head);
2810         struct lnet_net         *net;
2811
2812         mutex_lock(&the_lnet.ln_api_mutex);
2813
2814         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
2815
2816         if (the_lnet.ln_refcount > 0) {
2817                 rc = the_lnet.ln_refcount++;
2818                 mutex_unlock(&the_lnet.ln_api_mutex);
2819                 return rc;
2820         }
2821
2822         rc = lnet_prepare(requested_pid);
2823         if (rc != 0) {
2824                 mutex_unlock(&the_lnet.ln_api_mutex);
2825                 return rc;
2826         }
2827
2828         /* create a network for Loopback network */
2829         net = lnet_net_alloc(LNET_MKNET(LOLND, 0), &net_head);
2830         if (net == NULL) {
2831                 rc = -ENOMEM;
2832                 goto err_empty_list;
2833         }
2834
2835         /* Add in the loopback NI */
2836         if (lnet_ni_alloc(net, NULL, NULL) == NULL) {
2837                 rc = -ENOMEM;
2838                 goto err_empty_list;
2839         }
2840
2841         if (use_tcp_bonding)
2842                 CWARN("use_tcp_bonding has been removed. Use Multi-Rail and Dynamic Discovery instead, see LU-13641\n");
2843
2844         /* If LNet is being initialized via DLC it is possible
2845          * that the user requests not to load module parameters (ones which
2846          * are supported by DLC) on initialization.  Therefore, make sure not
2847          * to load networks, routes and forwarding from module parameters
2848          * in this case.  On cleanup in case of failure only clean up
2849          * routes if it has been loaded */
2850         if (!the_lnet.ln_nis_from_mod_params) {
2851                 rc = lnet_parse_networks(&net_head, lnet_get_networks());
2852                 if (rc < 0)
2853                         goto err_empty_list;
2854         }
2855
2856         ni_count = lnet_startup_lndnets(&net_head);
2857         if (ni_count < 0) {
2858                 rc = ni_count;
2859                 goto err_empty_list;
2860         }
2861
2862         if (!the_lnet.ln_nis_from_mod_params) {
2863                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
2864                 if (rc != 0)
2865                         goto err_shutdown_lndnis;
2866
2867                 rc = lnet_rtrpools_alloc(im_a_router);
2868                 if (rc != 0)
2869                         goto err_destroy_routes;
2870         }
2871
2872         rc = lnet_acceptor_start();
2873         if (rc != 0)
2874                 goto err_destroy_routes;
2875
2876         the_lnet.ln_refcount = 1;
2877         /* Now I may use my own API functions... */
2878
2879         rc = lnet_ping_target_setup(&pbuf, &ping_mdh, ni_count, true);
2880         if (rc != 0)
2881                 goto err_acceptor_stop;
2882
2883         lnet_ping_target_update(pbuf, ping_mdh);
2884
2885         the_lnet.ln_mt_handler = lnet_mt_event_handler;
2886
2887         rc = lnet_push_target_init();
2888         if (rc != 0)
2889                 goto err_stop_ping;
2890
2891         rc = lnet_peer_discovery_start();
2892         if (rc != 0)
2893                 goto err_destroy_push_target;
2894
2895         rc = lnet_monitor_thr_start();
2896         if (rc != 0)
2897                 goto err_stop_discovery_thr;
2898
2899         lnet_fault_init();
2900         lnet_router_debugfs_init();
2901
2902         mutex_unlock(&the_lnet.ln_api_mutex);
2903
2904         complete_all(&the_lnet.ln_started);
2905
2906         /* wait for all routers to start */
2907         lnet_wait_router_start();
2908
2909         return 0;
2910
2911 err_stop_discovery_thr:
2912         lnet_peer_discovery_stop();
2913 err_destroy_push_target:
2914         lnet_push_target_fini();
2915 err_stop_ping:
2916         lnet_ping_target_fini();
2917 err_acceptor_stop:
2918         the_lnet.ln_refcount = 0;
2919         lnet_acceptor_stop();
2920 err_destroy_routes:
2921         if (!the_lnet.ln_nis_from_mod_params)
2922                 lnet_destroy_routes();
2923 err_shutdown_lndnis:
2924         lnet_shutdown_lndnets();
2925 err_empty_list:
2926         lnet_unprepare();
2927         LASSERT(rc < 0);
2928         mutex_unlock(&the_lnet.ln_api_mutex);
2929         while (!list_empty(&net_head)) {
2930                 struct lnet_net *net;
2931
2932                 net = list_entry(net_head.next, struct lnet_net, net_list);
2933                 list_del_init(&net->net_list);
2934                 lnet_net_free(net);
2935         }
2936         return rc;
2937 }
2938 EXPORT_SYMBOL(LNetNIInit);
2939
2940 /**
2941  * Stop LNet interfaces, routing, and forwarding.
2942  *
2943  * Users must call this function once for each successful call to LNetNIInit().
2944  * Once the LNetNIFini() operation has been started, the results of pending
2945  * API operations are undefined.
2946  *
2947  * \return always 0 for current implementation.
2948  */
2949 int
2950 LNetNIFini(void)
2951 {
2952         mutex_lock(&the_lnet.ln_api_mutex);
2953
2954         LASSERT(the_lnet.ln_refcount > 0);
2955
2956         if (the_lnet.ln_refcount != 1) {
2957                 the_lnet.ln_refcount--;
2958         } else {
2959                 LASSERT(!the_lnet.ln_niinit_self);
2960
2961                 lnet_fault_fini();
2962
2963                 lnet_router_debugfs_fini();
2964                 lnet_monitor_thr_stop();
2965                 lnet_peer_discovery_stop();
2966                 lnet_push_target_fini();
2967                 lnet_ping_target_fini();
2968
2969                 /* Teardown fns that use my own API functions BEFORE here */
2970                 the_lnet.ln_refcount = 0;
2971
2972                 lnet_acceptor_stop();
2973                 lnet_destroy_routes();
2974                 lnet_shutdown_lndnets();
2975                 lnet_unprepare();
2976         }
2977
2978         mutex_unlock(&the_lnet.ln_api_mutex);
2979         return 0;
2980 }
2981 EXPORT_SYMBOL(LNetNIFini);
2982
2983 /**
2984  * Grabs the ni data from the ni structure and fills the out
2985  * parameters
2986  *
2987  * \param[in] ni network        interface structure
2988  * \param[out] cfg_ni           NI config information
2989  * \param[out] tun              network and LND tunables
2990  */
2991 static void
2992 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_ni *cfg_ni,
2993                    struct lnet_ioctl_config_lnd_tunables *tun,
2994                    struct lnet_ioctl_element_stats *stats,
2995                    __u32 tun_size)
2996 {
2997         size_t min_size = 0;
2998         int i;
2999
3000         if (!ni || !cfg_ni || !tun)
3001                 return;
3002
3003         if (ni->ni_interface != NULL) {
3004                 strncpy(cfg_ni->lic_ni_intf,
3005                         ni->ni_interface,
3006                         sizeof(cfg_ni->lic_ni_intf));
3007         }
3008
3009         cfg_ni->lic_nid = ni->ni_nid;
3010         cfg_ni->lic_status = lnet_ni_get_status_locked(ni);
3011         cfg_ni->lic_dev_cpt = ni->ni_dev_cpt;
3012
3013         memcpy(&tun->lt_cmn, &ni->ni_net->net_tunables, sizeof(tun->lt_cmn));
3014
3015         if (stats) {
3016                 stats->iel_send_count = lnet_sum_stats(&ni->ni_stats,
3017                                                        LNET_STATS_TYPE_SEND);
3018                 stats->iel_recv_count = lnet_sum_stats(&ni->ni_stats,
3019                                                        LNET_STATS_TYPE_RECV);
3020                 stats->iel_drop_count = lnet_sum_stats(&ni->ni_stats,
3021                                                        LNET_STATS_TYPE_DROP);
3022         }
3023
3024         /*
3025          * tun->lt_tun will always be present, but in order to be
3026          * backwards compatible, we need to deal with the cases when
3027          * tun->lt_tun is smaller than what the kernel has, because it
3028          * comes from an older version of a userspace program, then we'll
3029          * need to copy as much information as we have available space.
3030          */
3031         min_size = tun_size - sizeof(tun->lt_cmn);
3032         memcpy(&tun->lt_tun, &ni->ni_lnd_tunables, min_size);
3033
3034         /* copy over the cpts */
3035         if (ni->ni_ncpts == LNET_CPT_NUMBER &&
3036             ni->ni_cpts == NULL)  {
3037                 for (i = 0; i < ni->ni_ncpts; i++)
3038                         cfg_ni->lic_cpts[i] = i;
3039         } else {
3040                 for (i = 0;
3041                      ni->ni_cpts != NULL && i < ni->ni_ncpts &&
3042                      i < LNET_MAX_SHOW_NUM_CPT;
3043                      i++)
3044                         cfg_ni->lic_cpts[i] = ni->ni_cpts[i];
3045         }
3046         cfg_ni->lic_ncpts = ni->ni_ncpts;
3047 }
3048
3049 /**
3050  * NOTE: This is a legacy function left in the code to be backwards
3051  * compatible with older userspace programs. It should eventually be
3052  * removed.
3053  *
3054  * Grabs the ni data from the ni structure and fills the out
3055  * parameters
3056  *
3057  * \param[in] ni network        interface structure
3058  * \param[out] config           config information
3059  */
3060 static void
3061 lnet_fill_ni_info_legacy(struct lnet_ni *ni,
3062                          struct lnet_ioctl_config_data *config)
3063 {
3064         struct lnet_ioctl_net_config *net_config;
3065         struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
3066         size_t min_size, tunable_size = 0;
3067         int i;
3068
3069         if (!ni || !config)
3070                 return;
3071
3072         net_config = (struct lnet_ioctl_net_config *) config->cfg_bulk;
3073         if (!net_config)
3074                 return;
3075
3076         if (!ni->ni_interface)
3077                 return;
3078
3079         strncpy(net_config->ni_interface,
3080                 ni->ni_interface,
3081                 sizeof(net_config->ni_interface));
3082
3083         config->cfg_nid = ni->ni_nid;
3084         config->cfg_config_u.cfg_net.net_peer_timeout =
3085                 ni->ni_net->net_tunables.lct_peer_timeout;
3086         config->cfg_config_u.cfg_net.net_max_tx_credits =
3087                 ni->ni_net->net_tunables.lct_max_tx_credits;
3088         config->cfg_config_u.cfg_net.net_peer_tx_credits =
3089                 ni->ni_net->net_tunables.lct_peer_tx_credits;
3090         config->cfg_config_u.cfg_net.net_peer_rtr_credits =
3091                 ni->ni_net->net_tunables.lct_peer_rtr_credits;
3092
3093         net_config->ni_status = lnet_ni_get_status_locked(ni);
3094
3095         if (ni->ni_cpts) {
3096                 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
3097
3098                 for (i = 0; i < num_cpts; i++)
3099                         net_config->ni_cpts[i] = ni->ni_cpts[i];
3100
3101                 config->cfg_ncpts = num_cpts;
3102         }
3103
3104         /*
3105          * See if user land tools sent in a newer and larger version
3106          * of struct lnet_tunables than what the kernel uses.
3107          */
3108         min_size = sizeof(*config) + sizeof(*net_config);
3109
3110         if (config->cfg_hdr.ioc_len > min_size)
3111                 tunable_size = config->cfg_hdr.ioc_len - min_size;
3112
3113         /* Don't copy too much data to user space */
3114         min_size = min(tunable_size, sizeof(ni->ni_lnd_tunables));
3115         lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
3116
3117         if (lnd_cfg && min_size) {
3118                 memcpy(&lnd_cfg->lt_tun, &ni->ni_lnd_tunables, min_size);
3119                 config->cfg_config_u.cfg_net.net_interface_count = 1;
3120
3121                 /* Tell user land that kernel side has less data */
3122                 if (tunable_size > sizeof(ni->ni_lnd_tunables)) {
3123                         min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
3124                         config->cfg_hdr.ioc_len -= min_size;
3125                 }
3126         }
3127 }
3128
3129 struct lnet_ni *
3130 lnet_get_ni_idx_locked(int idx)
3131 {
3132         struct lnet_ni          *ni;
3133         struct lnet_net         *net;
3134
3135         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
3136                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3137                         if (idx-- == 0)
3138                                 return ni;
3139                 }
3140         }
3141
3142         return NULL;
3143 }
3144
3145 int lnet_get_net_healthv_locked(struct lnet_net *net)
3146 {
3147         struct lnet_ni *ni;
3148         int best_healthv = 0;
3149         int healthv, ni_fatal;
3150
3151         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3152                 healthv = atomic_read(&ni->ni_healthv);
3153                 ni_fatal = atomic_read(&ni->ni_fatal_error_on);
3154                 if (!ni_fatal && healthv > best_healthv)
3155                         best_healthv = healthv;
3156         }
3157
3158         return best_healthv;
3159 }
3160
3161 struct lnet_ni *
3162 lnet_get_next_ni_locked(struct lnet_net *mynet, struct lnet_ni *prev)
3163 {
3164         struct lnet_ni          *ni;
3165         struct lnet_net         *net = mynet;
3166
3167         /*
3168          * It is possible that the net has been cleaned out while there is
3169          * a message being sent. This function accessed the net without
3170          * checking if the list is empty
3171          */
3172         if (prev == NULL) {
3173                 if (net == NULL)
3174                         net = list_entry(the_lnet.ln_nets.next, struct lnet_net,
3175                                         net_list);
3176                 if (list_empty(&net->net_ni_list))
3177                         return NULL;
3178                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
3179                                 ni_netlist);
3180
3181                 return ni;
3182         }
3183
3184         if (prev->ni_netlist.next == &prev->ni_net->net_ni_list) {
3185                 /* if you reached the end of the ni list and the net is
3186                  * specified, then there are no more nis in that net */
3187                 if (net != NULL)
3188                         return NULL;
3189
3190                 /* we reached the end of this net ni list. move to the
3191                  * next net */
3192                 if (prev->ni_net->net_list.next == &the_lnet.ln_nets)
3193                         /* no more nets and no more NIs. */
3194                         return NULL;
3195
3196                 /* get the next net */
3197                 net = list_entry(prev->ni_net->net_list.next, struct lnet_net,
3198                                  net_list);
3199                 if (list_empty(&net->net_ni_list))
3200                         return NULL;
3201                 /* get the ni on it */
3202                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
3203                                 ni_netlist);
3204
3205                 return ni;
3206         }
3207
3208         if (list_empty(&prev->ni_netlist))
3209                 return NULL;
3210
3211         /* there are more nis left */
3212         ni = list_entry(prev->ni_netlist.next, struct lnet_ni, ni_netlist);
3213
3214         return ni;
3215 }
3216
3217 int
3218 lnet_get_net_config(struct lnet_ioctl_config_data *config)
3219 {
3220         struct lnet_ni *ni;
3221         int cpt;
3222         int rc = -ENOENT;
3223         int idx = config->cfg_count;
3224
3225         cpt = lnet_net_lock_current();
3226
3227         ni = lnet_get_ni_idx_locked(idx);
3228
3229         if (ni != NULL) {
3230                 rc = 0;
3231                 lnet_ni_lock(ni);
3232                 lnet_fill_ni_info_legacy(ni, config);
3233                 lnet_ni_unlock(ni);
3234         }
3235
3236         lnet_net_unlock(cpt);
3237         return rc;
3238 }
3239
3240 int
3241 lnet_get_ni_config(struct lnet_ioctl_config_ni *cfg_ni,
3242                    struct lnet_ioctl_config_lnd_tunables *tun,
3243                    struct lnet_ioctl_element_stats *stats,
3244                    __u32 tun_size)
3245 {
3246         struct lnet_ni          *ni;
3247         int                     cpt;
3248         int                     rc = -ENOENT;
3249
3250         if (!cfg_ni || !tun || !stats)
3251                 return -EINVAL;
3252
3253         cpt = lnet_net_lock_current();
3254
3255         ni = lnet_get_ni_idx_locked(cfg_ni->lic_idx);
3256
3257         if (ni) {
3258                 rc = 0;
3259                 lnet_ni_lock(ni);
3260                 lnet_fill_ni_info(ni, cfg_ni, tun, stats, tun_size);
3261                 lnet_ni_unlock(ni);
3262         }
3263
3264         lnet_net_unlock(cpt);
3265         return rc;
3266 }
3267
3268 int lnet_get_ni_stats(struct lnet_ioctl_element_msg_stats *msg_stats)
3269 {
3270         struct lnet_ni *ni;
3271         int cpt;
3272         int rc = -ENOENT;
3273
3274         if (!msg_stats)
3275                 return -EINVAL;
3276
3277         cpt = lnet_net_lock_current();
3278
3279         ni = lnet_get_ni_idx_locked(msg_stats->im_idx);
3280
3281         if (ni) {
3282                 lnet_usr_translate_stats(msg_stats, &ni->ni_stats);
3283                 rc = 0;
3284         }
3285
3286         lnet_net_unlock(cpt);
3287
3288         return rc;
3289 }
3290
3291 static int lnet_add_net_common(struct lnet_net *net,
3292                                struct lnet_ioctl_config_lnd_tunables *tun)
3293 {
3294         struct lnet_handle_md ping_mdh;
3295         struct lnet_ping_buffer *pbuf;
3296         struct lnet_remotenet *rnet;
3297         struct lnet_ni *ni;
3298         int net_ni_count;
3299         __u32 net_id;
3300         int rc;
3301
3302         lnet_net_lock(LNET_LOCK_EX);
3303         rnet = lnet_find_rnet_locked(net->net_id);
3304         lnet_net_unlock(LNET_LOCK_EX);
3305         /*
3306          * make sure that the net added doesn't invalidate the current
3307          * configuration LNet is keeping
3308          */
3309         if (rnet) {
3310                 CERROR("Adding net %s will invalidate routing configuration\n",
3311                        libcfs_net2str(net->net_id));
3312                 lnet_net_free(net);
3313                 return -EUSERS;
3314         }
3315
3316         /*
3317          * make sure you calculate the correct number of slots in the ping
3318          * buffer. Since the ping info is a flattened list of all the NIs,
3319          * we should allocate enough slots to accomodate the number of NIs
3320          * which will be added.
3321          *
3322          * since ni hasn't been configured yet, use
3323          * lnet_get_net_ni_count_pre() which checks the net_ni_added list
3324          */
3325         net_ni_count = lnet_get_net_ni_count_pre(net);
3326
3327         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3328                                     net_ni_count + lnet_get_ni_count(),
3329                                     false);
3330         if (rc < 0) {
3331                 lnet_net_free(net);
3332                 return rc;
3333         }
3334
3335         if (tun)
3336                 memcpy(&net->net_tunables,
3337                        &tun->lt_cmn, sizeof(net->net_tunables));
3338         else
3339                 memset(&net->net_tunables, -1, sizeof(net->net_tunables));
3340
3341         net_id = net->net_id;
3342
3343         rc = lnet_startup_lndnet(net,
3344                                  (tun) ? &tun->lt_tun : NULL);
3345         if (rc < 0)
3346                 goto failed;
3347
3348         lnet_net_lock(LNET_LOCK_EX);
3349         net = lnet_get_net_locked(net_id);
3350         LASSERT(net);
3351
3352         /* apply the UDSPs */
3353         rc = lnet_udsp_apply_policies_on_net(net);
3354         if (rc)
3355                 CERROR("Failed to apply UDSPs on local net %s\n",
3356                        libcfs_net2str(net->net_id));
3357
3358         /* At this point we lost track of which NI was just added, so we
3359          * just re-apply the policies on all of the NIs on this net
3360          */
3361         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3362                 rc = lnet_udsp_apply_policies_on_ni(ni);
3363                 if (rc)
3364                         CERROR("Failed to apply UDSPs on ni %s\n",
3365                                libcfs_nid2str(ni->ni_nid));
3366         }
3367         lnet_net_unlock(LNET_LOCK_EX);
3368
3369         /*
3370          * Start the acceptor thread if this is the first network
3371          * being added that requires the thread.
3372          */
3373         if (net->net_lnd->lnd_accept) {
3374                 rc = lnet_acceptor_start();
3375                 if (rc < 0) {
3376                         /* shutdown the net that we just started */
3377                         CERROR("Failed to start up acceptor thread\n");
3378                         lnet_shutdown_lndnet(net);
3379                         goto failed;
3380                 }
3381         }
3382
3383         lnet_net_lock(LNET_LOCK_EX);
3384         lnet_peer_net_added(net);
3385         lnet_net_unlock(LNET_LOCK_EX);
3386
3387         lnet_ping_target_update(pbuf, ping_mdh);
3388
3389         return 0;
3390
3391 failed:
3392         lnet_ping_md_unlink(pbuf, &ping_mdh);
3393         lnet_ping_buffer_decref(pbuf);
3394         return rc;
3395 }
3396
3397 static void
3398 lnet_set_tune_defaults(struct lnet_ioctl_config_lnd_tunables *tun)
3399 {
3400         if (tun) {
3401                 if (!tun->lt_cmn.lct_peer_timeout)
3402                         tun->lt_cmn.lct_peer_timeout = DEFAULT_PEER_TIMEOUT;
3403                 if (!tun->lt_cmn.lct_peer_tx_credits)
3404                         tun->lt_cmn.lct_peer_tx_credits = DEFAULT_PEER_CREDITS;
3405                 if (!tun->lt_cmn.lct_max_tx_credits)
3406                         tun->lt_cmn.lct_max_tx_credits = DEFAULT_CREDITS;
3407         }
3408 }
3409
3410 static int lnet_handle_legacy_ip2nets(char *ip2nets,
3411                                       struct lnet_ioctl_config_lnd_tunables *tun)
3412 {
3413         struct lnet_net *net;
3414         const char *nets;
3415         int rc;
3416         LIST_HEAD(net_head);
3417
3418         rc = lnet_parse_ip2nets(&nets, ip2nets);
3419         if (rc < 0)
3420                 return rc;
3421
3422         rc = lnet_parse_networks(&net_head, nets);
3423         if (rc < 0)
3424                 return rc;
3425
3426         lnet_set_tune_defaults(tun);
3427
3428         mutex_lock(&the_lnet.ln_api_mutex);
3429         while (!list_empty(&net_head)) {
3430                 net = list_entry(net_head.next, struct lnet_net, net_list);
3431                 list_del_init(&net->net_list);
3432                 rc = lnet_add_net_common(net, tun);
3433                 if (rc < 0)
3434                         goto out;
3435         }
3436
3437 out:
3438         mutex_unlock(&the_lnet.ln_api_mutex);
3439
3440         while (!list_empty(&net_head)) {
3441                 net = list_entry(net_head.next, struct lnet_net, net_list);
3442                 list_del_init(&net->net_list);
3443                 lnet_net_free(net);
3444         }
3445         return rc;
3446 }
3447
3448 int lnet_dyn_add_ni(struct lnet_ioctl_config_ni *conf)
3449 {
3450         struct lnet_net *net;
3451         struct lnet_ni *ni;
3452         struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3453         int rc, i;
3454         __u32 net_id, lnd_type;
3455
3456         /* get the tunables if they are available */
3457         if (conf->lic_cfg_hdr.ioc_len >=
3458             sizeof(*conf) + sizeof(*tun))
3459                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3460                         conf->lic_bulk;
3461
3462         /* handle legacy ip2nets from DLC */
3463         if (conf->lic_legacy_ip2nets[0] != '\0')
3464                 return lnet_handle_legacy_ip2nets(conf->lic_legacy_ip2nets,
3465                                                   tun);
3466
3467         net_id = LNET_NIDNET(conf->lic_nid);
3468         lnd_type = LNET_NETTYP(net_id);
3469
3470         if (!libcfs_isknown_lnd(lnd_type)) {
3471                 CERROR("No valid net and lnd information provided\n");
3472                 return -EINVAL;
3473         }
3474
3475         net = lnet_net_alloc(net_id, NULL);
3476         if (!net)
3477                 return -ENOMEM;
3478
3479         for (i = 0; i < conf->lic_ncpts; i++) {
3480                 if (conf->lic_cpts[i] >= LNET_CPT_NUMBER)
3481                         return -EINVAL;
3482         }
3483
3484         ni = lnet_ni_alloc_w_cpt_array(net, conf->lic_cpts, conf->lic_ncpts,
3485                                        conf->lic_ni_intf);
3486         if (!ni)
3487                 return -ENOMEM;
3488
3489         lnet_set_tune_defaults(tun);
3490
3491         mutex_lock(&the_lnet.ln_api_mutex);
3492
3493         rc = lnet_add_net_common(net, tun);
3494
3495         mutex_unlock(&the_lnet.ln_api_mutex);
3496
3497         return rc;
3498 }
3499
3500 int lnet_dyn_del_ni(struct lnet_ioctl_config_ni *conf)
3501 {
3502         struct lnet_net  *net;
3503         struct lnet_ni *ni;
3504         __u32 net_id = LNET_NIDNET(conf->lic_nid);
3505         struct lnet_ping_buffer *pbuf;
3506         struct lnet_handle_md  ping_mdh;
3507         int               rc;
3508         int               net_count;
3509         __u32             addr;
3510
3511         /* don't allow userspace to shutdown the LOLND */
3512         if (LNET_NETTYP(net_id) == LOLND)
3513                 return -EINVAL;
3514
3515         mutex_lock(&the_lnet.ln_api_mutex);
3516
3517         lnet_net_lock(0);
3518
3519         net = lnet_get_net_locked(net_id);
3520         if (!net) {
3521                 CERROR("net %s not found\n",
3522                        libcfs_net2str(net_id));
3523                 rc = -ENOENT;
3524                 goto unlock_net;
3525         }
3526
3527         addr = LNET_NIDADDR(conf->lic_nid);
3528         if (addr == 0) {
3529                 /* remove the entire net */
3530                 net_count = lnet_get_net_ni_count_locked(net);
3531
3532                 lnet_net_unlock(0);
3533
3534                 /* create and link a new ping info, before removing the old one */
3535                 rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3536                                         lnet_get_ni_count() - net_count,
3537                                         false);
3538                 if (rc != 0)
3539                         goto unlock_api_mutex;
3540
3541                 lnet_shutdown_lndnet(net);
3542
3543                 lnet_acceptor_stop();
3544
3545                 lnet_ping_target_update(pbuf, ping_mdh);
3546
3547                 goto unlock_api_mutex;
3548         }
3549
3550         ni = lnet_nid2ni_locked(conf->lic_nid, 0);
3551         if (!ni) {
3552                 CERROR("nid %s not found\n",
3553                        libcfs_nid2str(conf->lic_nid));
3554                 rc = -ENOENT;
3555                 goto unlock_net;
3556         }
3557
3558         net_count = lnet_get_net_ni_count_locked(net);
3559
3560         lnet_net_unlock(0);
3561
3562         /* create and link a new ping info, before removing the old one */
3563         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3564                                   lnet_get_ni_count() - 1, false);
3565         if (rc != 0)
3566                 goto unlock_api_mutex;
3567
3568         lnet_shutdown_lndni(ni);
3569
3570         lnet_acceptor_stop();
3571
3572         lnet_ping_target_update(pbuf, ping_mdh);
3573
3574         /* check if the net is empty and remove it if it is */
3575         if (net_count == 1)
3576                 lnet_shutdown_lndnet(net);
3577
3578         goto unlock_api_mutex;
3579
3580 unlock_net:
3581         lnet_net_unlock(0);
3582 unlock_api_mutex:
3583         mutex_unlock(&the_lnet.ln_api_mutex);
3584
3585         return rc;
3586 }
3587
3588 /*
3589  * lnet_dyn_add_net and lnet_dyn_del_net are now deprecated.
3590  * They are only expected to be called for unique networks.
3591  * That can be as a result of older DLC library
3592  * calls. Multi-Rail DLC and beyond no longer uses these APIs.
3593  */
3594 int
3595 lnet_dyn_add_net(struct lnet_ioctl_config_data *conf)
3596 {
3597         struct lnet_net *net;
3598         LIST_HEAD(net_head);
3599         int rc;
3600         struct lnet_ioctl_config_lnd_tunables tun;
3601         const char *nets = conf->cfg_config_u.cfg_net.net_intf;
3602
3603         /* Create a net/ni structures for the network string */
3604         rc = lnet_parse_networks(&net_head, nets);
3605         if (rc <= 0)
3606                 return rc == 0 ? -EINVAL : rc;
3607
3608         mutex_lock(&the_lnet.ln_api_mutex);
3609
3610         if (rc > 1) {
3611                 rc = -EINVAL; /* only add one network per call */
3612                 goto out_unlock_clean;
3613         }
3614
3615         net = list_entry(net_head.next, struct lnet_net, net_list);
3616         list_del_init(&net->net_list);
3617
3618         LASSERT(lnet_net_unique(net->net_id, &the_lnet.ln_nets, NULL));
3619
3620         memset(&tun, 0, sizeof(tun));
3621
3622         tun.lt_cmn.lct_peer_timeout =
3623           (!conf->cfg_config_u.cfg_net.net_peer_timeout) ? DEFAULT_PEER_TIMEOUT :
3624                 conf->cfg_config_u.cfg_net.net_peer_timeout;
3625         tun.lt_cmn.lct_peer_tx_credits =
3626           (!conf->cfg_config_u.cfg_net.net_peer_tx_credits) ? DEFAULT_PEER_CREDITS :
3627                 conf->cfg_config_u.cfg_net.net_peer_tx_credits;
3628         tun.lt_cmn.lct_peer_rtr_credits =
3629           conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
3630         tun.lt_cmn.lct_max_tx_credits =
3631           (!conf->cfg_config_u.cfg_net.net_max_tx_credits) ? DEFAULT_CREDITS :
3632                 conf->cfg_config_u.cfg_net.net_max_tx_credits;
3633
3634         rc = lnet_add_net_common(net, &tun);
3635
3636 out_unlock_clean:
3637         mutex_unlock(&the_lnet.ln_api_mutex);
3638         while (!list_empty(&net_head)) {
3639                 /* net_head list is empty in success case */
3640                 net = list_entry(net_head.next, struct lnet_net, net_list);
3641                 list_del_init(&net->net_list);
3642                 lnet_net_free(net);
3643         }
3644         return rc;
3645 }
3646
3647 int
3648 lnet_dyn_del_net(__u32 net_id)
3649 {
3650         struct lnet_net  *net;
3651         struct lnet_ping_buffer *pbuf;
3652         struct lnet_handle_md ping_mdh;
3653         int               rc;
3654         int               net_ni_count;
3655
3656         /* don't allow userspace to shutdown the LOLND */
3657         if (LNET_NETTYP(net_id) == LOLND)
3658                 return -EINVAL;
3659
3660         mutex_lock(&the_lnet.ln_api_mutex);
3661
3662         lnet_net_lock(0);
3663
3664         net = lnet_get_net_locked(net_id);
3665         if (net == NULL) {
3666                 lnet_net_unlock(0);
3667                 rc = -EINVAL;
3668                 goto out;
3669         }
3670
3671         net_ni_count = lnet_get_net_ni_count_locked(net);
3672
3673         lnet_net_unlock(0);
3674
3675         /* create and link a new ping info, before removing the old one */
3676         rc = lnet_ping_target_setup(&pbuf, &ping_mdh,
3677                                     lnet_get_ni_count() - net_ni_count, false);
3678         if (rc != 0)
3679                 goto out;
3680
3681         lnet_shutdown_lndnet(net);
3682
3683         lnet_acceptor_stop();
3684
3685         lnet_ping_target_update(pbuf, ping_mdh);
3686
3687 out:
3688         mutex_unlock(&the_lnet.ln_api_mutex);
3689
3690         return rc;
3691 }
3692
3693 void lnet_incr_dlc_seq(void)
3694 {
3695         atomic_inc(&lnet_dlc_seq_no);
3696 }
3697
3698 __u32 lnet_get_dlc_seq_locked(void)
3699 {
3700         return atomic_read(&lnet_dlc_seq_no);
3701 }
3702
3703 static void
3704 lnet_ni_set_healthv(lnet_nid_t nid, int value, bool all)
3705 {
3706         struct lnet_net *net;
3707         struct lnet_ni *ni;
3708
3709         lnet_net_lock(LNET_LOCK_EX);
3710         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
3711                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3712                         if (ni->ni_nid == nid || all) {
3713                                 atomic_set(&ni->ni_healthv, value);
3714                                 if (list_empty(&ni->ni_recovery) &&
3715                                     value < LNET_MAX_HEALTH_VALUE) {
3716                                         CERROR("manually adding local NI %s to recovery\n",
3717                                                libcfs_nid2str(ni->ni_nid));
3718                                         list_add_tail(&ni->ni_recovery,
3719                                                       &the_lnet.ln_mt_localNIRecovq);
3720                                         lnet_ni_addref_locked(ni, 0);
3721                                 }
3722                                 if (!all) {
3723                                         lnet_net_unlock(LNET_LOCK_EX);
3724                                         return;
3725                                 }
3726                         }
3727                 }
3728         }
3729         lnet_net_unlock(LNET_LOCK_EX);
3730 }
3731
3732 static void
3733 lnet_ni_set_conns_per_peer(lnet_nid_t nid, int value, bool all)
3734 {
3735         struct lnet_net *net;
3736         struct lnet_ni *ni;
3737
3738         lnet_net_lock(LNET_LOCK_EX);
3739         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
3740                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
3741                         if (ni->ni_nid != nid && !all)
3742                                 continue;
3743                         if (LNET_NETTYP(net->net_id) == SOCKLND)
3744                                 ni->ni_lnd_tunables.lnd_tun_u.lnd_sock.lnd_conns_per_peer = value;
3745                         else if (LNET_NETTYP(net->net_id) == O2IBLND)
3746                                 ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib.lnd_conns_per_peer = value;
3747                         if (!all) {
3748                                 lnet_net_unlock(LNET_LOCK_EX);
3749                                 return;
3750                         }
3751                 }
3752         }
3753         lnet_net_unlock(LNET_LOCK_EX);
3754 }
3755
3756 static int
3757 lnet_get_local_ni_hstats(struct lnet_ioctl_local_ni_hstats *stats)
3758 {
3759         int cpt, rc = 0;
3760         struct lnet_ni *ni;
3761         lnet_nid_t nid = stats->hlni_nid;
3762
3763         cpt = lnet_net_lock_current();
3764         ni = lnet_nid2ni_locked(nid, cpt);
3765
3766         if (!ni) {
3767                 rc = -ENOENT;
3768                 goto unlock;
3769         }
3770
3771         stats->hlni_local_interrupt = atomic_read(&ni->ni_hstats.hlt_local_interrupt);
3772         stats->hlni_local_dropped = atomic_read(&ni->ni_hstats.hlt_local_dropped);
3773         stats->hlni_local_aborted = atomic_read(&ni->ni_hstats.hlt_local_aborted);
3774         stats->hlni_local_no_route = atomic_read(&ni->ni_hstats.hlt_local_no_route);
3775         stats->hlni_local_timeout = atomic_read(&ni->ni_hstats.hlt_local_timeout);
3776         stats->hlni_local_error = atomic_read(&ni->ni_hstats.hlt_local_error);
3777         stats->hlni_fatal_error = atomic_read(&ni->ni_fatal_error_on);
3778         stats->hlni_health_value = atomic_read(&ni->ni_healthv);
3779         stats->hlni_ping_count = ni->ni_ping_count;
3780         stats->hlni_next_ping = ni->ni_next_ping;
3781
3782 unlock:
3783         lnet_net_unlock(cpt);
3784
3785         return rc;
3786 }
3787
3788 static int
3789 lnet_get_local_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3790 {
3791         struct lnet_ni *ni;
3792         int i = 0;
3793
3794         lnet_net_lock(LNET_LOCK_EX);
3795         list_for_each_entry(ni, &the_lnet.ln_mt_localNIRecovq, ni_recovery) {
3796                 list->rlst_nid_array[i] = ni->ni_nid;
3797                 i++;
3798                 if (i >= LNET_MAX_SHOW_NUM_NID)
3799                         break;
3800         }
3801         lnet_net_unlock(LNET_LOCK_EX);
3802         list->rlst_num_nids = i;
3803
3804         return 0;
3805 }
3806
3807 static int
3808 lnet_get_peer_ni_recovery_list(struct lnet_ioctl_recovery_list *list)
3809 {
3810         struct lnet_peer_ni *lpni;
3811         int i = 0;
3812
3813         lnet_net_lock(LNET_LOCK_EX);
3814         list_for_each_entry(lpni, &the_lnet.ln_mt_peerNIRecovq, lpni_recovery) {
3815                 list->rlst_nid_array[i] = lpni->lpni_nid;
3816                 i++;
3817                 if (i >= LNET_MAX_SHOW_NUM_NID)
3818                         break;
3819         }
3820         lnet_net_unlock(LNET_LOCK_EX);
3821         list->rlst_num_nids = i;
3822
3823         return 0;
3824 }
3825
3826 /**
3827  * LNet ioctl handler.
3828  *
3829  */
3830 int
3831 LNetCtl(unsigned int cmd, void *arg)
3832 {
3833         struct libcfs_ioctl_data *data = arg;
3834         struct lnet_ioctl_config_data *config;
3835         struct lnet_process_id    id = {0};
3836         struct lnet_ni           *ni;
3837         int                       rc;
3838
3839         BUILD_BUG_ON(sizeof(struct lnet_ioctl_net_config) +
3840                      sizeof(struct lnet_ioctl_config_data) > LIBCFS_IOC_DATA_MAX);
3841
3842         switch (cmd) {
3843         case IOC_LIBCFS_GET_NI:
3844                 rc = LNetGetId(data->ioc_count, &id);
3845                 data->ioc_nid = id.nid;
3846                 return rc;
3847
3848         case IOC_LIBCFS_FAIL_NID:
3849                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
3850
3851         case IOC_LIBCFS_ADD_ROUTE: {
3852                 /* default router sensitivity to 1 */
3853                 unsigned int sensitivity = 1;
3854                 config = arg;
3855
3856                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3857                         return -EINVAL;
3858
3859                 if (config->cfg_config_u.cfg_route.rtr_sensitivity) {
3860                         sensitivity =
3861                           config->cfg_config_u.cfg_route.rtr_sensitivity;
3862                 }
3863
3864                 mutex_lock(&the_lnet.ln_api_mutex);
3865                 rc = lnet_add_route(config->cfg_net,
3866                                     config->cfg_config_u.cfg_route.rtr_hop,
3867                                     config->cfg_nid,
3868                                     config->cfg_config_u.cfg_route.
3869                                         rtr_priority, sensitivity);
3870                 mutex_unlock(&the_lnet.ln_api_mutex);
3871                 return rc;
3872         }
3873
3874         case IOC_LIBCFS_DEL_ROUTE:
3875                 config = arg;
3876
3877                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3878                         return -EINVAL;
3879
3880                 mutex_lock(&the_lnet.ln_api_mutex);
3881                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
3882                 mutex_unlock(&the_lnet.ln_api_mutex);
3883                 return rc;
3884
3885         case IOC_LIBCFS_GET_ROUTE:
3886                 config = arg;
3887
3888                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3889                         return -EINVAL;
3890
3891                 mutex_lock(&the_lnet.ln_api_mutex);
3892                 rc = lnet_get_route(config->cfg_count,
3893                                     &config->cfg_net,
3894                                     &config->cfg_config_u.cfg_route.rtr_hop,
3895                                     &config->cfg_nid,
3896                                     &config->cfg_config_u.cfg_route.rtr_flags,
3897                                     &config->cfg_config_u.cfg_route.
3898                                         rtr_priority,
3899                                     &config->cfg_config_u.cfg_route.
3900                                         rtr_sensitivity);
3901                 mutex_unlock(&the_lnet.ln_api_mutex);
3902                 return rc;
3903
3904         case IOC_LIBCFS_GET_LOCAL_NI: {
3905                 struct lnet_ioctl_config_ni *cfg_ni;
3906                 struct lnet_ioctl_config_lnd_tunables *tun = NULL;
3907                 struct lnet_ioctl_element_stats *stats;
3908                 __u32 tun_size;
3909
3910                 cfg_ni = arg;
3911
3912                 /* get the tunables if they are available */
3913                 if (cfg_ni->lic_cfg_hdr.ioc_len <
3914                     sizeof(*cfg_ni) + sizeof(*stats) + sizeof(*tun))
3915                         return -EINVAL;
3916
3917                 stats = (struct lnet_ioctl_element_stats *)
3918                         cfg_ni->lic_bulk;
3919                 tun = (struct lnet_ioctl_config_lnd_tunables *)
3920                                 (cfg_ni->lic_bulk + sizeof(*stats));
3921
3922                 tun_size = cfg_ni->lic_cfg_hdr.ioc_len - sizeof(*cfg_ni) -
3923                         sizeof(*stats);
3924
3925                 mutex_lock(&the_lnet.ln_api_mutex);
3926                 rc = lnet_get_ni_config(cfg_ni, tun, stats, tun_size);
3927                 mutex_unlock(&the_lnet.ln_api_mutex);
3928                 return rc;
3929         }
3930
3931         case IOC_LIBCFS_GET_LOCAL_NI_MSG_STATS: {
3932                 struct lnet_ioctl_element_msg_stats *msg_stats = arg;
3933
3934                 if (msg_stats->im_hdr.ioc_len != sizeof(*msg_stats))
3935                         return -EINVAL;
3936
3937                 mutex_lock(&the_lnet.ln_api_mutex);
3938                 rc = lnet_get_ni_stats(msg_stats);
3939                 mutex_unlock(&the_lnet.ln_api_mutex);
3940
3941                 return rc;
3942         }
3943
3944         case IOC_LIBCFS_GET_NET: {
3945                 size_t total = sizeof(*config) +
3946                                sizeof(struct lnet_ioctl_net_config);
3947                 config = arg;
3948
3949                 if (config->cfg_hdr.ioc_len < total)
3950                         return -EINVAL;
3951
3952                 mutex_lock(&the_lnet.ln_api_mutex);
3953                 rc = lnet_get_net_config(config);
3954                 mutex_unlock(&the_lnet.ln_api_mutex);
3955                 return rc;
3956         }
3957
3958         case IOC_LIBCFS_GET_LNET_STATS:
3959         {
3960                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
3961
3962                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
3963                         return -EINVAL;
3964
3965                 mutex_lock(&the_lnet.ln_api_mutex);
3966                 rc = lnet_counters_get(&lnet_stats->st_cntrs);
3967                 mutex_unlock(&the_lnet.ln_api_mutex);
3968                 return rc;
3969         }
3970
3971         case IOC_LIBCFS_RESET_LNET_STATS:
3972         {
3973                 mutex_lock(&the_lnet.ln_api_mutex);
3974                 lnet_counters_reset();
3975                 mutex_unlock(&the_lnet.ln_api_mutex);
3976                 return 0;
3977         }
3978
3979         case IOC_LIBCFS_CONFIG_RTR:
3980                 config = arg;
3981
3982                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3983                         return -EINVAL;
3984
3985                 mutex_lock(&the_lnet.ln_api_mutex);
3986                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
3987                         rc = lnet_rtrpools_enable();
3988                         mutex_unlock(&the_lnet.ln_api_mutex);
3989                         return rc;
3990                 }
3991                 lnet_rtrpools_disable();
3992                 mutex_unlock(&the_lnet.ln_api_mutex);
3993                 return 0;
3994
3995         case IOC_LIBCFS_ADD_BUF:
3996                 config = arg;
3997
3998                 if (config->cfg_hdr.ioc_len < sizeof(*config))
3999                         return -EINVAL;
4000
4001                 mutex_lock(&the_lnet.ln_api_mutex);
4002                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.
4003                                                 buf_tiny,
4004                                           config->cfg_config_u.cfg_buffers.
4005                                                 buf_small,
4006                                           config->cfg_config_u.cfg_buffers.
4007                                                 buf_large);
4008                 mutex_unlock(&the_lnet.ln_api_mutex);
4009                 return rc;
4010
4011         case IOC_LIBCFS_SET_NUMA_RANGE: {
4012                 struct lnet_ioctl_set_value *numa;
4013                 numa = arg;
4014                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
4015                         return -EINVAL;
4016                 lnet_net_lock(LNET_LOCK_EX);
4017                 lnet_numa_range = numa->sv_value;
4018                 lnet_net_unlock(LNET_LOCK_EX);
4019                 return 0;
4020         }
4021
4022         case IOC_LIBCFS_GET_NUMA_RANGE: {
4023                 struct lnet_ioctl_set_value *numa;
4024                 numa = arg;
4025                 if (numa->sv_hdr.ioc_len != sizeof(*numa))
4026                         return -EINVAL;
4027                 numa->sv_value = lnet_numa_range;
4028                 return 0;
4029         }
4030
4031         case IOC_LIBCFS_GET_BUF: {
4032                 struct lnet_ioctl_pool_cfg *pool_cfg;
4033                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
4034
4035                 config = arg;
4036
4037                 if (config->cfg_hdr.ioc_len < total)
4038                         return -EINVAL;
4039
4040                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
4041
4042                 mutex_lock(&the_lnet.ln_api_mutex);
4043                 rc = lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
4044                 mutex_unlock(&the_lnet.ln_api_mutex);
4045                 return rc;
4046         }
4047
4048         case IOC_LIBCFS_GET_LOCAL_HSTATS: {
4049                 struct lnet_ioctl_local_ni_hstats *stats = arg;
4050
4051                 if (stats->hlni_hdr.ioc_len < sizeof(*stats))
4052                         return -EINVAL;
4053
4054                 mutex_lock(&the_lnet.ln_api_mutex);
4055                 rc = lnet_get_local_ni_hstats(stats);
4056                 mutex_unlock(&the_lnet.ln_api_mutex);
4057
4058                 return rc;
4059         }
4060
4061         case IOC_LIBCFS_GET_RECOVERY_QUEUE: {
4062                 struct lnet_ioctl_recovery_list *list = arg;
4063                 if (list->rlst_hdr.ioc_len < sizeof(*list))
4064                         return -EINVAL;
4065
4066                 mutex_lock(&the_lnet.ln_api_mutex);
4067                 if (list->rlst_type == LNET_HEALTH_TYPE_LOCAL_NI)
4068                         rc = lnet_get_local_ni_recovery_list(list);
4069                 else
4070                         rc = lnet_get_peer_ni_recovery_list(list);
4071                 mutex_unlock(&the_lnet.ln_api_mutex);
4072                 return rc;
4073         }
4074
4075         case IOC_LIBCFS_ADD_PEER_NI: {
4076                 struct lnet_ioctl_peer_cfg *cfg = arg;
4077
4078                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
4079                         return -EINVAL;
4080
4081                 mutex_lock(&the_lnet.ln_api_mutex);
4082                 rc = lnet_add_peer_ni(cfg->prcfg_prim_nid,
4083                                       cfg->prcfg_cfg_nid,
4084                                       cfg->prcfg_mr, false);
4085                 mutex_unlock(&the_lnet.ln_api_mutex);
4086                 return rc;
4087         }
4088
4089         case IOC_LIBCFS_DEL_PEER_NI: {
4090                 struct lnet_ioctl_peer_cfg *cfg = arg;
4091
4092                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
4093                         return -EINVAL;
4094
4095                 mutex_lock(&the_lnet.ln_api_mutex);
4096                 rc = lnet_del_peer_ni(cfg->prcfg_prim_nid,
4097                                       cfg->prcfg_cfg_nid);
4098                 mutex_unlock(&the_lnet.ln_api_mutex);
4099                 return rc;
4100         }
4101
4102         case IOC_LIBCFS_GET_PEER_INFO: {
4103                 struct lnet_ioctl_peer *peer_info = arg;
4104
4105                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
4106                         return -EINVAL;
4107
4108                 mutex_lock(&the_lnet.ln_api_mutex);
4109                 rc = lnet_get_peer_ni_info(
4110                    peer_info->pr_count,
4111                    &peer_info->pr_nid,
4112                    peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
4113                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
4114                    &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
4115                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
4116                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
4117                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
4118                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_tx_credits,
4119                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
4120                 mutex_unlock(&the_lnet.ln_api_mutex);
4121                 return rc;
4122         }
4123
4124         case IOC_LIBCFS_GET_PEER_NI: {
4125                 struct lnet_ioctl_peer_cfg *cfg = arg;
4126
4127                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
4128                         return -EINVAL;
4129
4130                 mutex_lock(&the_lnet.ln_api_mutex);
4131                 rc = lnet_get_peer_info(cfg,
4132                                         (void __user *)cfg->prcfg_bulk);
4133                 mutex_unlock(&the_lnet.ln_api_mutex);
4134                 return rc;
4135         }
4136
4137         case IOC_LIBCFS_GET_PEER_LIST: {
4138                 struct lnet_ioctl_peer_cfg *cfg = arg;
4139
4140                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
4141                         return -EINVAL;
4142
4143                 mutex_lock(&the_lnet.ln_api_mutex);
4144                 rc = lnet_get_peer_list(&cfg->prcfg_count, &cfg->prcfg_size,
4145                                 (struct lnet_process_id __user *)cfg->prcfg_bulk);
4146                 mutex_unlock(&the_lnet.ln_api_mutex);
4147                 return rc;
4148         }
4149
4150         case IOC_LIBCFS_SET_HEALHV: {
4151                 struct lnet_ioctl_reset_health_cfg *cfg = arg;
4152                 int value;
4153                 if (cfg->rh_hdr.ioc_len < sizeof(*cfg))
4154                         return -EINVAL;
4155                 if (cfg->rh_value < 0 ||
4156                     cfg->rh_value > LNET_MAX_HEALTH_VALUE)
4157                         value = LNET_MAX_HEALTH_VALUE;
4158                 else
4159                         value = cfg->rh_value;
4160                 CDEBUG(D_NET, "Manually setting healthv to %d for %s:%s. all = %d\n",
4161                        value, (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI) ?
4162                        "local" : "peer", libcfs_nid2str(cfg->rh_nid), cfg->rh_all);
4163                 mutex_lock(&the_lnet.ln_api_mutex);
4164                 if (cfg->rh_type == LNET_HEALTH_TYPE_LOCAL_NI)
4165                         lnet_ni_set_healthv(cfg->rh_nid, value,
4166                                              cfg->rh_all);
4167                 else
4168                         lnet_peer_ni_set_healthv(cfg->rh_nid, value,
4169                                                   cfg->rh_all);
4170                 mutex_unlock(&the_lnet.ln_api_mutex);
4171                 return 0;
4172         }
4173
4174         case IOC_LIBCFS_SET_CONNS_PER_PEER: {
4175                 struct lnet_ioctl_reset_conns_per_peer_cfg *cfg = arg;
4176                 int value;
4177
4178                 if (cfg->rcpp_hdr.ioc_len < sizeof(*cfg))
4179                         return -EINVAL;
4180                 if (cfg->rcpp_value < 0)
4181                         value = 1;
4182                 else
4183                         value = cfg->rcpp_value;
4184                 CDEBUG(D_NET,
4185                        "Setting conns_per_peer to %d for %s. all = %d\n",
4186                        value, libcfs_nid2str(cfg->rcpp_nid), cfg->rcpp_all);
4187                 mutex_lock(&the_lnet.ln_api_mutex);
4188                 lnet_ni_set_conns_per_peer(cfg->rcpp_nid, value, cfg->rcpp_all);
4189                 mutex_unlock(&the_lnet.ln_api_mutex);
4190                 return 0;
4191         }
4192
4193         case IOC_LIBCFS_NOTIFY_ROUTER: {
4194                 time64_t deadline = ktime_get_real_seconds() - data->ioc_u64[0];
4195
4196                 /* The deadline passed in by the user should be some time in
4197                  * seconds in the future since the UNIX epoch. We have to map
4198                  * that deadline to the wall clock.
4199                  */
4200                 deadline += ktime_get_seconds();
4201                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags, false,
4202                                    deadline);
4203         }
4204
4205         case IOC_LIBCFS_LNET_DIST:
4206                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
4207                 if (rc < 0 && rc != -EHOSTUNREACH)
4208                         return rc;
4209
4210                 data->ioc_u32[0] = rc;
4211                 return 0;
4212
4213         case IOC_LIBCFS_TESTPROTOCOMPAT:
4214                 the_lnet.ln_testprotocompat = data->ioc_flags;
4215                 return 0;
4216
4217         case IOC_LIBCFS_LNET_FAULT:
4218                 return lnet_fault_ctl(data->ioc_flags, data);
4219
4220         case IOC_LIBCFS_PING: {
4221                 signed long timeout;
4222
4223                 id.nid = data->ioc_nid;
4224                 id.pid = data->ioc_u32[0];
4225
4226                 /* If timeout is negative then set default of 3 minutes */
4227                 if (((s32)data->ioc_u32[1] <= 0) ||
4228                     data->ioc_u32[1] > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
4229                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
4230                 else
4231                         timeout = nsecs_to_jiffies(data->ioc_u32[1] * NSEC_PER_MSEC);
4232
4233                 rc = lnet_ping(id, timeout, data->ioc_pbuf1,
4234                                data->ioc_plen1 / sizeof(struct lnet_process_id));
4235
4236                 if (rc < 0)
4237                         return rc;
4238
4239                 data->ioc_count = rc;
4240                 return 0;
4241         }
4242
4243         case IOC_LIBCFS_PING_PEER: {
4244                 struct lnet_ioctl_ping_data *ping = arg;
4245                 struct lnet_peer *lp;
4246                 signed long timeout;
4247
4248                 /* If timeout is negative then set default of 3 minutes */
4249                 if (((s32)ping->op_param) <= 0 ||
4250                     ping->op_param > (DEFAULT_PEER_TIMEOUT * MSEC_PER_SEC))
4251                         timeout = cfs_time_seconds(DEFAULT_PEER_TIMEOUT);
4252                 else
4253                         timeout = nsecs_to_jiffies(ping->op_param * NSEC_PER_MSEC);
4254
4255                 rc = lnet_ping(ping->ping_id, timeout,
4256                                ping->ping_buf,
4257                                ping->ping_count);
4258                 if (rc < 0)
4259                         return rc;
4260
4261                 mutex_lock(&the_lnet.ln_api_mutex);
4262                 lp = lnet_find_peer(ping->ping_id.nid);
4263                 if (lp) {
4264                         ping->ping_id.nid = lp->lp_primary_nid;
4265                         ping->mr_info = lnet_peer_is_multi_rail(lp);
4266                         lnet_peer_decref_locked(lp);
4267                 }
4268                 mutex_unlock(&the_lnet.ln_api_mutex);
4269
4270                 ping->ping_count = rc;
4271                 return 0;
4272         }
4273
4274         case IOC_LIBCFS_DISCOVER: {
4275                 struct lnet_ioctl_ping_data *discover = arg;
4276                 struct lnet_peer *lp;
4277
4278                 rc = lnet_discover(discover->ping_id, discover->op_param,
4279                                    discover->ping_buf,
4280                                    discover->ping_count);
4281                 if (rc < 0)
4282                         return rc;
4283
4284                 mutex_lock(&the_lnet.ln_api_mutex);
4285                 lp = lnet_find_peer(discover->ping_id.nid);
4286                 if (lp) {
4287                         discover->ping_id.nid = lp->lp_primary_nid;
4288                         discover->mr_info = lnet_peer_is_multi_rail(lp);
4289                         lnet_peer_decref_locked(lp);
4290                 }
4291                 mutex_unlock(&the_lnet.ln_api_mutex);
4292
4293                 discover->ping_count = rc;
4294                 return 0;
4295         }
4296
4297         case IOC_LIBCFS_ADD_UDSP: {
4298                 struct lnet_ioctl_udsp *ioc_udsp = arg;
4299                 __u32 bulk_size = ioc_udsp->iou_hdr.ioc_len;
4300
4301                 mutex_lock(&the_lnet.ln_api_mutex);
4302                 rc = lnet_udsp_demarshal_add(arg, bulk_size);
4303                 if (!rc) {
4304                         rc = lnet_udsp_apply_policies(NULL, false);
4305                         CDEBUG(D_NET, "policy application returned %d\n", rc);
4306                         rc = 0;
4307                 }
4308                 mutex_unlock(&the_lnet.ln_api_mutex);
4309
4310                 return rc;
4311         }
4312
4313         case IOC_LIBCFS_DEL_UDSP: {
4314                 struct lnet_ioctl_udsp *ioc_udsp = arg;
4315                 int idx = ioc_udsp->iou_idx;
4316
4317                 if (ioc_udsp->iou_hdr.ioc_len < sizeof(*ioc_udsp))
4318                         return -EINVAL;
4319
4320                 mutex_lock(&the_lnet.ln_api_mutex);
4321                 rc = lnet_udsp_del_policy(idx);
4322                 if (!rc) {
4323                         rc = lnet_udsp_apply_policies(NULL, false);
4324                         CDEBUG(D_NET, "policy re-application returned %d\n",
4325                                rc);
4326                         rc = 0;
4327                 }
4328                 mutex_unlock(&the_lnet.ln_api_mutex);
4329
4330                 return rc;
4331         }
4332
4333         case IOC_LIBCFS_GET_UDSP_SIZE: {
4334                 struct lnet_ioctl_udsp *ioc_udsp = arg;
4335                 struct lnet_udsp *udsp;
4336
4337                 if (ioc_udsp->iou_hdr.ioc_len < sizeof(*ioc_udsp))
4338                         return -EINVAL;
4339
4340                 rc = 0;
4341
4342                 mutex_lock(&the_lnet.ln_api_mutex);
4343                 udsp = lnet_udsp_get_policy(ioc_udsp->iou_idx);
4344                 if (!udsp) {
4345                         rc = -ENOENT;
4346                 } else {
4347                         /* coming in iou_idx will hold the idx of the udsp
4348                          * to get the size of. going out the iou_idx will
4349                          * hold the size of the UDSP found at the passed
4350                          * in index.
4351                          */
4352                         ioc_udsp->iou_idx = lnet_get_udsp_size(udsp);
4353                         if (ioc_udsp->iou_idx < 0)
4354                                 rc = -EINVAL;
4355                 }
4356                 mutex_unlock(&the_lnet.ln_api_mutex);
4357
4358                 return rc;
4359         }
4360
4361         case IOC_LIBCFS_GET_UDSP: {
4362                 struct lnet_ioctl_udsp *ioc_udsp = arg;
4363                 struct lnet_udsp *udsp;
4364
4365                 if (ioc_udsp->iou_hdr.ioc_len < sizeof(*ioc_udsp))
4366                         return -EINVAL;
4367
4368                 rc = 0;
4369
4370                 mutex_lock(&the_lnet.ln_api_mutex);
4371                 udsp = lnet_udsp_get_policy(ioc_udsp->iou_idx);
4372                 if (!udsp)
4373                         rc = -ENOENT;
4374                 else
4375                         rc = lnet_udsp_marshal(udsp, ioc_udsp);
4376                 mutex_unlock(&the_lnet.ln_api_mutex);
4377
4378                 return rc;
4379         }
4380
4381         case IOC_LIBCFS_GET_CONST_UDSP_INFO: {
4382                 struct lnet_ioctl_construct_udsp_info *info = arg;
4383
4384                 if (info->cud_hdr.ioc_len < sizeof(*info))
4385                         return -EINVAL;
4386
4387                 CDEBUG(D_NET, "GET_UDSP_INFO for %s\n",
4388                        libcfs_nid2str(info->cud_nid));
4389
4390                 mutex_lock(&the_lnet.ln_api_mutex);
4391                 lnet_udsp_get_construct_info(info);
4392                 mutex_unlock(&the_lnet.ln_api_mutex);
4393
4394                 return 0;
4395         }
4396
4397         default:
4398                 ni = lnet_net2ni_addref(data->ioc_net);
4399                 if (ni == NULL)
4400                         return -EINVAL;
4401
4402                 if (ni->ni_net->net_lnd->lnd_ctl == NULL)
4403                         rc = -EINVAL;
4404                 else
4405                         rc = ni->ni_net->net_lnd->lnd_ctl(ni, cmd, arg);
4406
4407                 lnet_ni_decref(ni);
4408                 return rc;
4409         }
4410         /* not reached */
4411 }
4412 EXPORT_SYMBOL(LNetCtl);
4413
4414 void LNetDebugPeer(struct lnet_process_id id)
4415 {
4416         lnet_debug_peer(id.nid);
4417 }
4418 EXPORT_SYMBOL(LNetDebugPeer);
4419
4420 /**
4421  * Determine if the specified peer \a nid is on the local node.
4422  *
4423  * \param nid   peer nid to check
4424  *
4425  * \retval true         If peer NID is on the local node.
4426  * \retval false        If peer NID is not on the local node.
4427  */
4428 bool LNetIsPeerLocal(lnet_nid_t nid)
4429 {
4430         struct lnet_net *net;
4431         struct lnet_ni *ni;
4432         int cpt;
4433
4434         cpt = lnet_net_lock_current();
4435         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4436                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4437                         if (ni->ni_nid == nid) {
4438                                 lnet_net_unlock(cpt);
4439                                 return true;
4440                         }
4441                 }
4442         }
4443         lnet_net_unlock(cpt);
4444
4445         return false;
4446 }
4447 EXPORT_SYMBOL(LNetIsPeerLocal);
4448
4449 /**
4450  * Retrieve the struct lnet_process_id ID of LNet interface at \a index.
4451  * Note that all interfaces share a same PID, as requested by LNetNIInit().
4452  *
4453  * \param index Index of the interface to look up.
4454  * \param id On successful return, this location will hold the
4455  * struct lnet_process_id ID of the interface.
4456  *
4457  * \retval 0 If an interface exists at \a index.
4458  * \retval -ENOENT If no interface has been found.
4459  */
4460 int
4461 LNetGetId(unsigned int index, struct lnet_process_id *id)
4462 {
4463         struct lnet_ni   *ni;
4464         struct lnet_net  *net;
4465         int               cpt;
4466         int               rc = -ENOENT;
4467
4468         LASSERT(the_lnet.ln_refcount > 0);
4469
4470         cpt = lnet_net_lock_current();
4471
4472         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
4473                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
4474                         if (index-- != 0)
4475                                 continue;
4476
4477                         id->nid = ni->ni_nid;
4478                         id->pid = the_lnet.ln_pid;
4479                         rc = 0;
4480                         break;
4481                 }
4482         }
4483
4484         lnet_net_unlock(cpt);
4485         return rc;
4486 }
4487 EXPORT_SYMBOL(LNetGetId);
4488
4489 struct ping_data {
4490         int rc;
4491         int replied;
4492         struct lnet_handle_md mdh;
4493         struct completion completion;
4494 };
4495
4496 static void
4497 lnet_ping_event_handler(struct lnet_event *event)
4498 {
4499         struct ping_data *pd = event->md_user_ptr;
4500
4501         CDEBUG(D_NET, "ping event (%d %d)%s\n",
4502                event->type, event->status,
4503                event->unlinked ? " unlinked" : "");
4504
4505         if (event->status) {
4506                 if (!pd->rc)
4507                         pd->rc = event->status;
4508         } else if (event->type == LNET_EVENT_REPLY) {
4509                 pd->replied = 1;
4510                 pd->rc = event->mlength;
4511         }
4512         if (event->unlinked)
4513                 complete(&pd->completion);
4514 }
4515
4516 static int lnet_ping(struct lnet_process_id id, signed long timeout,
4517                      struct lnet_process_id __user *ids, int n_ids)
4518 {
4519         struct lnet_md md = { NULL };
4520         struct ping_data pd = { 0 };
4521         struct lnet_ping_buffer *pbuf;
4522         struct lnet_process_id tmpid;
4523         int i;
4524         int nob;
4525         int rc;
4526         int rc2;
4527
4528         /* n_ids limit is arbitrary */
4529         if (n_ids <= 0 || id.nid == LNET_NID_ANY)
4530                 return -EINVAL;
4531
4532         /*
4533          * if the user buffer has more space than the lnet_interfaces_max
4534          * then only fill it up to lnet_interfaces_max
4535          */
4536         if (n_ids > lnet_interfaces_max)
4537                 n_ids = lnet_interfaces_max;
4538
4539         if (id.pid == LNET_PID_ANY)
4540                 id.pid = LNET_PID_LUSTRE;
4541
4542         pbuf = lnet_ping_buffer_alloc(n_ids, GFP_NOFS);
4543         if (!pbuf)
4544                 return -ENOMEM;
4545
4546         /* initialize md content */
4547         md.start     = &pbuf->pb_info;
4548         md.length    = LNET_PING_INFO_SIZE(n_ids);
4549         md.threshold = 2; /* GET/REPLY */
4550         md.max_size  = 0;
4551         md.options   = LNET_MD_TRUNCATE;
4552         md.user_ptr  = &pd;
4553         md.handler   = lnet_ping_event_handler;
4554
4555         init_completion(&pd.completion);
4556
4557         rc = LNetMDBind(&md, LNET_UNLINK, &pd.mdh);
4558         if (rc != 0) {
4559                 CERROR("Can't bind MD: %d\n", rc);
4560                 goto fail_ping_buffer_decref;
4561         }
4562
4563         rc = LNetGet(LNET_NID_ANY, pd.mdh, id,
4564                      LNET_RESERVED_PORTAL,
4565                      LNET_PROTO_PING_MATCHBITS, 0, false);
4566
4567         if (rc != 0) {
4568                 /* Don't CERROR; this could be deliberate! */
4569                 rc2 = LNetMDUnlink(pd.mdh);
4570                 LASSERT(rc2 == 0);
4571
4572                 /* NB must wait for the UNLINK event below... */
4573         }
4574
4575         if (wait_for_completion_timeout(&pd.completion, timeout) == 0) {
4576                 /* Ensure completion in finite time... */
4577                 LNetMDUnlink(pd.mdh);
4578                 wait_for_completion(&pd.completion);
4579         }
4580         if (!pd.replied) {
4581                 rc = -EIO;
4582                 goto fail_ping_buffer_decref;
4583         }
4584
4585         nob = pd.rc;
4586         LASSERT(nob >= 0 && nob <= LNET_PING_INFO_SIZE(n_ids));
4587
4588         rc = -EPROTO;           /* if I can't parse... */
4589
4590         if (nob < 8) {
4591                 CERROR("%s: ping info too short %d\n",
4592                        libcfs_id2str(id), nob);
4593                 goto fail_ping_buffer_decref;
4594         }
4595
4596         if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
4597                 lnet_swap_pinginfo(pbuf);
4598         } else if (pbuf->pb_info.pi_magic != LNET_PROTO_PING_MAGIC) {
4599                 CERROR("%s: Unexpected magic %08x\n",
4600                        libcfs_id2str(id), pbuf->pb_info.pi_magic);
4601                 goto fail_ping_buffer_decref;
4602         }
4603
4604         if ((pbuf->pb_info.pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
4605                 CERROR("%s: ping w/o NI status: 0x%x\n",
4606                        libcfs_id2str(id), pbuf->pb_info.pi_features);
4607                 goto fail_ping_buffer_decref;
4608         }
4609
4610         if (nob < LNET_PING_INFO_SIZE(0)) {
4611                 CERROR("%s: Short reply %d(%d min)\n",
4612                        libcfs_id2str(id),
4613                        nob, (int)LNET_PING_INFO_SIZE(0));
4614                 goto fail_ping_buffer_decref;
4615         }
4616
4617         if (pbuf->pb_info.pi_nnis < n_ids)
4618                 n_ids = pbuf->pb_info.pi_nnis;
4619
4620         if (nob < LNET_PING_INFO_SIZE(n_ids)) {
4621                 CERROR("%s: Short reply %d(%d expected)\n",
4622                        libcfs_id2str(id),
4623                        nob, (int)LNET_PING_INFO_SIZE(n_ids));
4624                 goto fail_ping_buffer_decref;
4625         }
4626
4627         rc = -EFAULT;           /* if I segv in copy_to_user()... */
4628
4629         memset(&tmpid, 0, sizeof(tmpid));
4630         for (i = 0; i < n_ids; i++) {
4631                 tmpid.pid = pbuf->pb_info.pi_pid;
4632                 tmpid.nid = pbuf->pb_info.pi_ni[i].ns_nid;
4633                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
4634                         goto fail_ping_buffer_decref;
4635         }
4636         rc = pbuf->pb_info.pi_nnis;
4637
4638  fail_ping_buffer_decref:
4639         lnet_ping_buffer_decref(pbuf);
4640         return rc;
4641 }
4642
4643 static int
4644 lnet_discover(struct lnet_process_id id, __u32 force,
4645               struct lnet_process_id __user *ids, int n_ids)
4646 {
4647         struct lnet_peer_ni *lpni;
4648         struct lnet_peer_ni *p;
4649         struct lnet_peer *lp;
4650         struct lnet_process_id *buf;
4651         int cpt;
4652         int i;
4653         int rc;
4654
4655         if (n_ids <= 0 ||
4656             id.nid == LNET_NID_ANY)
4657                 return -EINVAL;
4658
4659         if (id.pid == LNET_PID_ANY)
4660                 id.pid = LNET_PID_LUSTRE;
4661
4662         /*
4663          * If the user buffer has more space than the lnet_interfaces_max,
4664          * then only fill it up to lnet_interfaces_max.
4665          */
4666         if (n_ids > lnet_interfaces_max)
4667                 n_ids = lnet_interfaces_max;
4668
4669         CFS_ALLOC_PTR_ARRAY(buf, n_ids);
4670         if (!buf)
4671                 return -ENOMEM;
4672
4673         cpt = lnet_net_lock_current();
4674         lpni = lnet_nid2peerni_locked(id.nid, LNET_NID_ANY, cpt);
4675         if (IS_ERR(lpni)) {
4676                 rc = PTR_ERR(lpni);
4677                 goto out;
4678         }
4679
4680         /*
4681          * Clearing the NIDS_UPTODATE flag ensures the peer will
4682          * be discovered, provided discovery has not been disabled.
4683          */
4684         lp = lpni->lpni_peer_net->lpn_peer;
4685         spin_lock(&lp->lp_lock);
4686         lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
4687         /* If the force flag is set, force a PING and PUSH as well. */
4688         if (force)
4689                 lp->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH;
4690         spin_unlock(&lp->lp_lock);
4691         rc = lnet_discover_peer_locked(lpni, cpt, true);
4692         if (rc)
4693                 goto out_decref;
4694
4695         /* The lpni (or lp) for this NID may have changed and our ref is
4696          * the only thing keeping the old one around. Release the ref
4697          * and lookup the lpni again
4698          */
4699         lnet_peer_ni_decref_locked(lpni);
4700         lpni = lnet_find_peer_ni_locked(id.nid);
4701         if (!lpni) {
4702                 rc = -ENOENT;
4703                 goto out;
4704         }
4705         lp = lpni->lpni_peer_net->lpn_peer;
4706
4707         i = 0;
4708         p = NULL;
4709         while ((p = lnet_get_next_peer_ni_locked(lp, NULL, p)) != NULL) {
4710                 buf[i].pid = id.pid;
4711                 buf[i].nid = p->lpni_nid;
4712                 if (++i >= n_ids)
4713                         break;
4714         }
4715         rc = i;
4716
4717 out_decref:
4718         lnet_peer_ni_decref_locked(lpni);
4719 out:
4720         lnet_net_unlock(cpt);
4721
4722         if (rc >= 0)
4723                 if (copy_to_user(ids, buf, rc * sizeof(*buf)))
4724                         rc = -EFAULT;
4725         CFS_FREE_PTR_ARRAY(buf, n_ids);
4726
4727         return rc;
4728 }
4729
4730 /**
4731  * Retrieve peer discovery status.
4732  *
4733  * \retval 1 if lnet_peer_discovery_disabled is 0
4734  * \retval 0 if lnet_peer_discovery_disabled is 1
4735  */
4736 int
4737 LNetGetPeerDiscoveryStatus(void)
4738 {
4739         return !lnet_peer_discovery_disabled;
4740 }
4741 EXPORT_SYMBOL(LNetGetPeerDiscoveryStatus);