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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LNET
  38 #include <linux/log2.h>
  39 #include <lnet/lib-lnet.h>
  40
  41 #define D_LNI D_CONSOLE
  42
  43 lnet_t      the_lnet;                           /* THE state of the network */
  44 EXPORT_SYMBOL(the_lnet);
  45
  46 static char *ip2nets = "";
  47 CFS_MODULE_PARM(ip2nets, "s", charp, 0444,
  48                 "LNET network <- IP table");
  49
  50 static char *networks = "";
  51 CFS_MODULE_PARM(networks, "s", charp, 0444,
  52                 "local networks");
  53
  54 static char *routes = "";
  55 CFS_MODULE_PARM(routes, "s", charp, 0444,
  56                 "routes to non-local networks");
  57
  58 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
  59 CFS_MODULE_PARM(rnet_htable_size, "i", int, 0444,
  60                 "size of remote network hash table");
  61
  62 static int lnet_ping(lnet_process_id_t id, int timeout_ms,
  63                      lnet_process_id_t *ids, int n_ids);
  64
  65 static char *
  66 lnet_get_routes(void)
  67 {
  68         return routes;
  69 }
  70
  71 static char *
  72 lnet_get_networks(void)
  73 {
  74         char   *nets;
  75         int     rc;
  76
  77         if (*networks != 0 && *ip2nets != 0) {
  78                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
  79                                    "'ip2nets' but not both at once\n");
  80                 return NULL;
  81         }
  82
  83         if (*ip2nets != 0) {
  84                 rc = lnet_parse_ip2nets(&nets, ip2nets);
  85                 return (rc == 0) ? nets : NULL;
  86         }
  87
  88         if (*networks != 0)
  89                 return networks;
  90
  91         return "tcp";
  92 }
  93
  94 static void
  95 lnet_init_locks(void)
  96 {
  97         spin_lock_init(&the_lnet.ln_eq_wait_lock);
  98         init_waitqueue_head(&the_lnet.ln_eq_waitq);
  99         init_waitqueue_head(&the_lnet.ln_rc_waitq);
 100         mutex_init(&the_lnet.ln_lnd_mutex);
 101         mutex_init(&the_lnet.ln_api_mutex);
 102 }
 103
 104 static void
 105 lnet_fini_locks(void)
 106 {
 107 }
 108
 109 static int
 110 lnet_create_remote_nets_table(void)
 111 {
 112         int               i;
 113         struct list_head *hash;
 114
 115         LASSERT(the_lnet.ln_remote_nets_hash == NULL);
 116         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 117         LIBCFS_ALLOC(hash, LNET_REMOTE_NETS_HASH_SIZE * sizeof(*hash));
 118         if (hash == NULL) {
 119                 CERROR("Failed to create remote nets hash table\n");
 120                 return -ENOMEM;
 121         }
 122
 123         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 124                 INIT_LIST_HEAD(&hash[i]);
 125         the_lnet.ln_remote_nets_hash = hash;
 126         return 0;
 127 }
 128
 129 static void
 130 lnet_destroy_remote_nets_table(void)
 131 {
 132         int i;
 133
 134         if (the_lnet.ln_remote_nets_hash == NULL)
 135                 return;
 136
 137         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 138                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 139
 140         LIBCFS_FREE(the_lnet.ln_remote_nets_hash,
 141                     LNET_REMOTE_NETS_HASH_SIZE *
 142                     sizeof(the_lnet.ln_remote_nets_hash[0]));
 143         the_lnet.ln_remote_nets_hash = NULL;
 144 }
 145
 146 static void
 147 lnet_destroy_locks(void)
 148 {
 149         if (the_lnet.ln_res_lock != NULL) {
 150                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 151                 the_lnet.ln_res_lock = NULL;
 152         }
 153
 154         if (the_lnet.ln_net_lock != NULL) {
 155                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 156                 the_lnet.ln_net_lock = NULL;
 157         }
 158
 159         lnet_fini_locks();
 160 }
 161
 162 static int
 163 lnet_create_locks(void)
 164 {
 165         lnet_init_locks();
 166
 167         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 168         if (the_lnet.ln_res_lock == NULL)
 169                 goto failed;
 170
 171         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 172         if (the_lnet.ln_net_lock == NULL)
 173                 goto failed;
 174
 175         return 0;
 176
 177  failed:
 178         lnet_destroy_locks();
 179         return -ENOMEM;
 180 }
 181
 182 static void lnet_assert_wire_constants(void)
 183 {
 184         /* Wire protocol assertions generated by 'wirecheck'
 185          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 186          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 187          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
 188
 189         /* Constants... */
 190         CLASSERT (LNET_PROTO_TCP_MAGIC == 0xeebc0ded);
 191         CLASSERT (LNET_PROTO_TCP_VERSION_MAJOR == 1);
 192         CLASSERT (LNET_PROTO_TCP_VERSION_MINOR == 0);
 193         CLASSERT (LNET_MSG_ACK == 0);
 194         CLASSERT (LNET_MSG_PUT == 1);
 195         CLASSERT (LNET_MSG_GET == 2);
 196         CLASSERT (LNET_MSG_REPLY == 3);
 197         CLASSERT (LNET_MSG_HELLO == 4);
 198
 199         /* Checks for struct ptl_handle_wire_t */
 200         CLASSERT ((int)sizeof(lnet_handle_wire_t) == 16);
 201         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_interface_cookie) == 0);
 202         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_interface_cookie) == 8);
 203         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_object_cookie) == 8);
 204         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_object_cookie) == 8);
 205
 206         /* Checks for struct lnet_magicversion_t */
 207         CLASSERT ((int)sizeof(lnet_magicversion_t) == 8);
 208         CLASSERT ((int)offsetof(lnet_magicversion_t, magic) == 0);
 209         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->magic) == 4);
 210         CLASSERT ((int)offsetof(lnet_magicversion_t, version_major) == 4);
 211         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_major) == 2);
 212         CLASSERT ((int)offsetof(lnet_magicversion_t, version_minor) == 6);
 213         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_minor) == 2);
 214
 215         /* Checks for struct lnet_hdr_t */
 216         CLASSERT ((int)sizeof(lnet_hdr_t) == 72);
 217         CLASSERT ((int)offsetof(lnet_hdr_t, dest_nid) == 0);
 218         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_nid) == 8);
 219         CLASSERT ((int)offsetof(lnet_hdr_t, src_nid) == 8);
 220         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_nid) == 8);
 221         CLASSERT ((int)offsetof(lnet_hdr_t, dest_pid) == 16);
 222         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_pid) == 4);
 223         CLASSERT ((int)offsetof(lnet_hdr_t, src_pid) == 20);
 224         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_pid) == 4);
 225         CLASSERT ((int)offsetof(lnet_hdr_t, type) == 24);
 226         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->type) == 4);
 227         CLASSERT ((int)offsetof(lnet_hdr_t, payload_length) == 28);
 228         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->payload_length) == 4);
 229         CLASSERT ((int)offsetof(lnet_hdr_t, msg) == 32);
 230         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg) == 40);
 231
 232         /* Ack */
 233         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.dst_wmd) == 32);
 234         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.dst_wmd) == 16);
 235         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.match_bits) == 48);
 236         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.match_bits) == 8);
 237         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.mlength) == 56);
 238         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.mlength) == 4);
 239
 240         /* Put */
 241         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ack_wmd) == 32);
 242         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ack_wmd) == 16);
 243         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.match_bits) == 48);
 244         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.match_bits) == 8);
 245         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.hdr_data) == 56);
 246         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.hdr_data) == 8);
 247         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ptl_index) == 64);
 248         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ptl_index) == 4);
 249         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.offset) == 68);
 250         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.offset) == 4);
 251
 252         /* Get */
 253         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.return_wmd) == 32);
 254         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.return_wmd) == 16);
 255         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.match_bits) == 48);
 256         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.match_bits) == 8);
 257         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.ptl_index) == 56);
 258         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.ptl_index) == 4);
 259         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.src_offset) == 60);
 260         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.src_offset) == 4);
 261         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.sink_length) == 64);
 262         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.sink_length) == 4);
 263
 264         /* Reply */
 265         CLASSERT ((int)offsetof(lnet_hdr_t, msg.reply.dst_wmd) == 32);
 266         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.reply.dst_wmd) == 16);
 267
 268         /* Hello */
 269         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.incarnation) == 32);
 270         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.incarnation) == 8);
 271         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.type) == 40);
 272         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.type) == 4);
 273 }
 274
 275 static lnd_t *lnet_find_lnd_by_type(__u32 type)
 276 {
 277         lnd_t            *lnd;
 278         struct list_head *tmp;
 279
 280         /* holding lnd mutex */
 281         list_for_each(tmp, &the_lnet.ln_lnds) {
 282                 lnd = list_entry(tmp, lnd_t, lnd_list);
 283
 284                 if (lnd->lnd_type == type)
 285                         return lnd;
 286         }
 287         return NULL;
 288 }
 289
 290 void
 291 lnet_register_lnd (lnd_t *lnd)
 292 {
 293         LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
 294
 295         LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
 296         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 297
 298         list_add_tail(&lnd->lnd_list, &the_lnet.ln_lnds);
 299         lnd->lnd_refcount = 0;
 300
 301         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 302
 303         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
 304 }
 305 EXPORT_SYMBOL(lnet_register_lnd);
 306
 307 void
 308 lnet_unregister_lnd (lnd_t *lnd)
 309 {
 310         LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
 311
 312         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 313         LASSERT(lnd->lnd_refcount == 0);
 314
 315         list_del(&lnd->lnd_list);
 316         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 317
 318         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
 319 }
 320 EXPORT_SYMBOL(lnet_unregister_lnd);
 321
 322 void
 323 lnet_counters_get(lnet_counters_t *counters)
 324 {
 325         lnet_counters_t *ctr;
 326         int             i;
 327
 328         memset(counters, 0, sizeof(*counters));
 329
 330         lnet_net_lock(LNET_LOCK_EX);
 331
 332         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 333                 counters->msgs_max     += ctr->msgs_max;
 334                 counters->msgs_alloc   += ctr->msgs_alloc;
 335                 counters->errors       += ctr->errors;
 336                 counters->send_count   += ctr->send_count;
 337                 counters->recv_count   += ctr->recv_count;
 338                 counters->route_count  += ctr->route_count;
 339                 counters->drop_count   += ctr->drop_count;
 340                 counters->send_length  += ctr->send_length;
 341                 counters->recv_length  += ctr->recv_length;
 342                 counters->route_length += ctr->route_length;
 343                 counters->drop_length  += ctr->drop_length;
 344
 345         }
 346         lnet_net_unlock(LNET_LOCK_EX);
 347 }
 348 EXPORT_SYMBOL(lnet_counters_get);
 349
 350 void
 351 lnet_counters_reset(void)
 352 {
 353         lnet_counters_t *counters;
 354         int             i;
 355
 356         lnet_net_lock(LNET_LOCK_EX);
 357
 358         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
 359                 memset(counters, 0, sizeof(lnet_counters_t));
 360
 361         lnet_net_unlock(LNET_LOCK_EX);
 362 }
 363
 364 static __u64 lnet_create_interface_cookie(void)
 365 {
 366         /* NB the interface cookie in wire handles guards against delayed
 367          * replies and ACKs appearing valid after reboot. Initialisation time,
 368          * even if it's only implemented to millisecond resolution is probably
 369          * easily good enough. */
 370         struct timeval tv;
 371         __u64          cookie;
 372         do_gettimeofday(&tv);
 373         cookie = tv.tv_sec;
 374         cookie *= 1000000;
 375         cookie += tv.tv_usec;
 376         return cookie;
 377 }
 378
 379 static char *
 380 lnet_res_type2str(int type)
 381 {
 382         switch (type) {
 383         default:
 384                 LBUG();
 385         case LNET_COOKIE_TYPE_MD:
 386                 return "MD";
 387         case LNET_COOKIE_TYPE_ME:
 388                 return "ME";
 389         case LNET_COOKIE_TYPE_EQ:
 390                 return "EQ";
 391         }
 392 }
 393
 394 static void
 395 lnet_res_container_cleanup(struct lnet_res_container *rec)
 396 {
 397         int     count = 0;
 398
 399         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
 400                 return;
 401
 402         while (!list_empty(&rec->rec_active)) {
 403                 struct list_head *e = rec->rec_active.next;
 404
 405                 list_del_init(e);
 406                 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
 407                         lnet_eq_free(list_entry(e, lnet_eq_t, eq_list));
 408
 409                 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
 410                         lnet_md_free(list_entry(e, lnet_libmd_t, md_list));
 411
 412                 } else { /* NB: Active MEs should be attached on portals */
 413                         LBUG();
 414                 }
 415                 count++;
 416         }
 417
 418         if (count > 0) {
 419                 /* Found alive MD/ME/EQ, user really should unlink/free
 420                  * all of them before finalize LNet, but if someone didn't,
 421                  * we have to recycle garbage for him */
 422                 CERROR("%d active elements on exit of %s container\n",
 423                        count, lnet_res_type2str(rec->rec_type));
 424         }
 425
 426         if (rec->rec_lh_hash != NULL) {
 427                 LIBCFS_FREE(rec->rec_lh_hash,
 428                             LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 429                 rec->rec_lh_hash = NULL;
 430         }
 431
 432         rec->rec_type = 0; /* mark it as finalized */
 433 }
 434
 435 static int
 436 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
 437 {
 438         int     rc = 0;
 439         int     i;
 440
 441         LASSERT(rec->rec_type == 0);
 442
 443         rec->rec_type = type;
 444         INIT_LIST_HEAD(&rec->rec_active);
 445
 446         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
 447
 448         /* Arbitrary choice of hash table size */
 449         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
 450                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 451         if (rec->rec_lh_hash == NULL) {
 452                 rc = -ENOMEM;
 453                 goto out;
 454         }
 455
 456         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
 457                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
 458
 459         return 0;
 460
 461 out:
 462         CERROR("Failed to setup %s resource container\n",
 463                lnet_res_type2str(type));
 464         lnet_res_container_cleanup(rec);
 465         return rc;
 466 }
 467
 468 static void
 469 lnet_res_containers_destroy(struct lnet_res_container **recs)
 470 {
 471         struct lnet_res_container       *rec;
 472         int                             i;
 473
 474         cfs_percpt_for_each(rec, i, recs)
 475                 lnet_res_container_cleanup(rec);
 476
 477         cfs_percpt_free(recs);
 478 }
 479
 480 static struct lnet_res_container **
 481 lnet_res_containers_create(int type)
 482 {
 483         struct lnet_res_container       **recs;
 484         struct lnet_res_container       *rec;
 485         int                             rc;
 486         int                             i;
 487
 488         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
 489         if (recs == NULL) {
 490                 CERROR("Failed to allocate %s resource containers\n",
 491                        lnet_res_type2str(type));
 492                 return NULL;
 493         }
 494
 495         cfs_percpt_for_each(rec, i, recs) {
 496                 rc = lnet_res_container_setup(rec, i, type);
 497                 if (rc != 0) {
 498                         lnet_res_containers_destroy(recs);
 499                         return NULL;
 500                 }
 501         }
 502
 503         return recs;
 504 }
 505
 506 lnet_libhandle_t *
 507 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
 508 {
 509         /* ALWAYS called with lnet_res_lock held */
 510         struct list_head        *head;
 511         lnet_libhandle_t        *lh;
 512         unsigned int            hash;
 513
 514         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
 515                 return NULL;
 516
 517         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
 518         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
 519
 520         list_for_each_entry(lh, head, lh_hash_chain) {
 521                 if (lh->lh_cookie == cookie)
 522                         return lh;
 523         }
 524
 525         return NULL;
 526 }
 527
 528 void
 529 lnet_res_lh_initialize(struct lnet_res_container *rec, lnet_libhandle_t *lh)
 530 {
 531         /* ALWAYS called with lnet_res_lock held */
 532         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
 533         unsigned int    hash;
 534
 535         lh->lh_cookie = rec->rec_lh_cookie;
 536         rec->rec_lh_cookie += 1 << ibits;
 537
 538         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
 539
 540         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
 541 }
 542
 543 static int lnet_unprepare(void);
 544
 545 static int
 546 lnet_prepare(lnet_pid_t requested_pid)
 547 {
 548         /* Prepare to bring up the network */
 549         struct lnet_res_container **recs;
 550         int                       rc = 0;
 551
 552         if (requested_pid == LNET_PID_ANY) {
 553                 /* Don't instantiate LNET just for me */
 554                 return -ENETDOWN;
 555         }
 556
 557         LASSERT(the_lnet.ln_refcount == 0);
 558
 559         the_lnet.ln_routing = 0;
 560
 561         LASSERT((requested_pid & LNET_PID_USERFLAG) == 0);
 562         the_lnet.ln_pid = requested_pid;
 563
 564         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
 565         INIT_LIST_HEAD(&the_lnet.ln_nis);
 566         INIT_LIST_HEAD(&the_lnet.ln_nis_cpt);
 567         INIT_LIST_HEAD(&the_lnet.ln_nis_zombie);
 568         INIT_LIST_HEAD(&the_lnet.ln_routers);
 569         INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
 570         INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
 571
 572         rc = lnet_create_remote_nets_table();
 573         if (rc != 0)
 574                 goto failed;
 575
 576         the_lnet.ln_interface_cookie = lnet_create_interface_cookie();
 577
 578         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
 579                                                 sizeof(lnet_counters_t));
 580         if (the_lnet.ln_counters == NULL) {
 581                 CERROR("Failed to allocate counters for LNet\n");
 582                 rc = -ENOMEM;
 583                 goto failed;
 584         }
 585
 586         rc = lnet_peer_tables_create();
 587         if (rc != 0)
 588                 goto failed;
 589
 590         rc = lnet_msg_containers_create();
 591         if (rc != 0)
 592                 goto failed;
 593
 594         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
 595                                       LNET_COOKIE_TYPE_EQ);
 596         if (rc != 0)
 597                 goto failed;
 598
 599         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME);
 600         if (recs == NULL) {
 601                 rc = -ENOMEM;
 602                 goto failed;
 603         }
 604
 605         the_lnet.ln_me_containers = recs;
 606
 607         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
 608         if (recs == NULL) {
 609                 rc = -ENOMEM;
 610                 goto failed;
 611         }
 612
 613         the_lnet.ln_md_containers = recs;
 614
 615         rc = lnet_portals_create();
 616         if (rc != 0) {
 617                 CERROR("Failed to create portals for LNet: %d\n", rc);
 618                 goto failed;
 619         }
 620
 621         return 0;
 622
 623  failed:
 624         lnet_unprepare();
 625         return rc;
 626 }
 627
 628 static int
 629 lnet_unprepare (void)
 630 {
 631         /* NB no LNET_LOCK since this is the last reference.  All LND instances
 632          * have shut down already, so it is safe to unlink and free all
 633          * descriptors, even those that appear committed to a network op (eg MD
 634          * with non-zero pending count) */
 635
 636         lnet_fail_nid(LNET_NID_ANY, 0);
 637
 638         LASSERT(the_lnet.ln_refcount == 0);
 639         LASSERT(list_empty(&the_lnet.ln_test_peers));
 640         LASSERT(list_empty(&the_lnet.ln_nis));
 641         LASSERT(list_empty(&the_lnet.ln_nis_cpt));
 642         LASSERT(list_empty(&the_lnet.ln_nis_zombie));
 643
 644         lnet_portals_destroy();
 645
 646         if (the_lnet.ln_md_containers != NULL) {
 647                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
 648                 the_lnet.ln_md_containers = NULL;
 649         }
 650
 651         if (the_lnet.ln_me_containers != NULL) {
 652                 lnet_res_containers_destroy(the_lnet.ln_me_containers);
 653                 the_lnet.ln_me_containers = NULL;
 654         }
 655
 656         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
 657
 658         lnet_msg_containers_destroy();
 659         lnet_peer_tables_destroy();
 660         lnet_rtrpools_free(0);
 661
 662         if (the_lnet.ln_counters != NULL) {
 663                 cfs_percpt_free(the_lnet.ln_counters);
 664                 the_lnet.ln_counters = NULL;
 665         }
 666         lnet_destroy_remote_nets_table();
 667
 668         return 0;
 669 }
 670
 671 lnet_ni_t  *
 672 lnet_net2ni_locked(__u32 net, int cpt)
 673 {
 674         struct list_head *tmp;
 675         lnet_ni_t        *ni;
 676
 677         LASSERT(cpt != LNET_LOCK_EX);
 678
 679         list_for_each(tmp, &the_lnet.ln_nis) {
 680                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 681
 682                 if (LNET_NIDNET(ni->ni_nid) == net) {
 683                         lnet_ni_addref_locked(ni, cpt);
 684                         return ni;
 685                 }
 686         }
 687
 688         return NULL;
 689 }
 690
 691 lnet_ni_t *
 692 lnet_net2ni(__u32 net)
 693 {
 694         lnet_ni_t *ni;
 695
 696         lnet_net_lock(0);
 697         ni = lnet_net2ni_locked(net, 0);
 698         lnet_net_unlock(0);
 699
 700         return ni;
 701 }
 702 EXPORT_SYMBOL(lnet_net2ni);
 703
 704 static unsigned int
 705 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
 706 {
 707         __u64           key = nid;
 708         unsigned int    val;
 709
 710         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
 711
 712         if (number == 1)
 713                 return 0;
 714
 715         val = hash_long(key, LNET_CPT_BITS);
 716         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
 717         if (val < number)
 718                 return val;
 719
 720         return (unsigned int)(key + val + (val >> 1)) % number;
 721 }
 722
 723 int
 724 lnet_cpt_of_nid_locked(lnet_nid_t nid)
 725 {
 726         struct lnet_ni *ni;
 727
 728         /* must called with hold of lnet_net_lock */
 729         if (LNET_CPT_NUMBER == 1)
 730                 return 0; /* the only one */
 731
 732         /* take lnet_net_lock(any) would be OK */
 733         if (!list_empty(&the_lnet.ln_nis_cpt)) {
 734                 list_for_each_entry(ni, &the_lnet.ln_nis_cpt, ni_cptlist) {
 735                         if (LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid))
 736                                 continue;
 737
 738                         LASSERT(ni->ni_cpts != NULL);
 739                         return ni->ni_cpts[lnet_nid_cpt_hash
 740                                            (nid, ni->ni_ncpts)];
 741                 }
 742         }
 743
 744         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 745 }
 746
 747 int
 748 lnet_cpt_of_nid(lnet_nid_t nid)
 749 {
 750         int     cpt;
 751         int     cpt2;
 752
 753         if (LNET_CPT_NUMBER == 1)
 754                 return 0; /* the only one */
 755
 756         if (list_empty(&the_lnet.ln_nis_cpt))
 757                 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 758
 759         cpt = lnet_net_lock_current();
 760         cpt2 = lnet_cpt_of_nid_locked(nid);
 761         lnet_net_unlock(cpt);
 762
 763         return cpt2;
 764 }
 765 EXPORT_SYMBOL(lnet_cpt_of_nid);
 766
 767 int
 768 lnet_islocalnet(__u32 net)
 769 {
 770         struct lnet_ni  *ni;
 771         int             cpt;
 772
 773         cpt = lnet_net_lock_current();
 774
 775         ni = lnet_net2ni_locked(net, cpt);
 776         if (ni != NULL)
 777                 lnet_ni_decref_locked(ni, cpt);
 778
 779         lnet_net_unlock(cpt);
 780
 781         return ni != NULL;
 782 }
 783
 784 lnet_ni_t  *
 785 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
 786 {
 787         struct lnet_ni   *ni;
 788         struct list_head *tmp;
 789
 790         LASSERT(cpt != LNET_LOCK_EX);
 791
 792         list_for_each(tmp, &the_lnet.ln_nis) {
 793                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 794
 795                 if (ni->ni_nid == nid) {
 796                         lnet_ni_addref_locked(ni, cpt);
 797                         return ni;
 798                 }
 799         }
 800
 801         return NULL;
 802 }
 803
 804 int
 805 lnet_islocalnid(lnet_nid_t nid)
 806 {
 807         struct lnet_ni  *ni;
 808         int             cpt;
 809
 810         cpt = lnet_net_lock_current();
 811         ni = lnet_nid2ni_locked(nid, cpt);
 812         if (ni != NULL)
 813                 lnet_ni_decref_locked(ni, cpt);
 814         lnet_net_unlock(cpt);
 815
 816         return ni != NULL;
 817 }
 818
 819 int
 820 lnet_count_acceptor_nis (void)
 821 {
 822         /* Return the # of NIs that need the acceptor. */
 823         int              count = 0;
 824         struct list_head *tmp;
 825         struct lnet_ni   *ni;
 826         int              cpt;
 827
 828         cpt = lnet_net_lock_current();
 829         list_for_each(tmp, &the_lnet.ln_nis) {
 830                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 831
 832                 if (ni->ni_lnd->lnd_accept != NULL)
 833                         count++;
 834         }
 835
 836         lnet_net_unlock(cpt);
 837
 838         return count;
 839 }
 840
 841 static lnet_ping_info_t *
 842 lnet_ping_info_create(int num_ni)
 843 {
 844         lnet_ping_info_t *ping_info;
 845         unsigned int     infosz;
 846
 847         infosz = offsetof(lnet_ping_info_t, pi_ni[num_ni]);
 848         LIBCFS_ALLOC(ping_info, infosz);
 849         if (ping_info == NULL) {
 850                 CERROR("Can't allocate ping info[%d]\n", num_ni);
 851                 return NULL;
 852         }
 853
 854         ping_info->pi_nnis = num_ni;
 855         ping_info->pi_pid = the_lnet.ln_pid;
 856         ping_info->pi_magic = LNET_PROTO_PING_MAGIC;
 857         ping_info->pi_features = LNET_PING_FEAT_NI_STATUS;
 858
 859         return ping_info;
 860 }
 861
 862 static inline int
 863 lnet_get_ni_count(void)
 864 {
 865         struct lnet_ni *ni;
 866         int            count = 0;
 867
 868         lnet_net_lock(0);
 869
 870         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list)
 871                 count++;
 872
 873         lnet_net_unlock(0);
 874
 875         return count;
 876 }
 877
 878 static inline void
 879 lnet_ping_info_free(lnet_ping_info_t *pinfo)
 880 {
 881         LIBCFS_FREE(pinfo,
 882                     offsetof(lnet_ping_info_t,
 883                              pi_ni[pinfo->pi_nnis]));
 884 }
 885
 886 static void
 887 lnet_ping_info_destroy(void)
 888 {
 889         struct lnet_ni  *ni;
 890
 891         lnet_net_lock(LNET_LOCK_EX);
 892
 893         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
 894                 lnet_ni_lock(ni);
 895                 ni->ni_status = NULL;
 896                 lnet_ni_unlock(ni);
 897         }
 898
 899         lnet_ping_info_free(the_lnet.ln_ping_info);
 900         the_lnet.ln_ping_info = NULL;
 901
 902         lnet_net_unlock(LNET_LOCK_EX);
 903 }
 904
 905 static void
 906 lnet_ping_event_handler(lnet_event_t *event)
 907 {
 908         lnet_ping_info_t *pinfo = event->md.user_ptr;
 909
 910         if (event->unlinked)
 911                 pinfo->pi_features = LNET_PING_FEAT_INVAL;
 912 }
 913
 914 static int
 915 lnet_ping_info_setup(lnet_ping_info_t **ppinfo, lnet_handle_md_t *md_handle,
 916                      int ni_count, bool set_eq)
 917 {
 918         lnet_handle_me_t  me_handle;
 919         lnet_process_id_t id = {LNET_NID_ANY, LNET_PID_ANY};
 920         lnet_md_t         md = {NULL};
 921         int               rc, rc2;
 922
 923         if (set_eq) {
 924                 rc = LNetEQAlloc(0, lnet_ping_event_handler,
 925                                  &the_lnet.ln_ping_target_eq);
 926                 if (rc != 0) {
 927                         CERROR("Can't allocate ping EQ: %d\n", rc);
 928                         return rc;
 929                 }
 930         }
 931
 932         *ppinfo = lnet_ping_info_create(ni_count);
 933         if (*ppinfo == NULL) {
 934                 rc = -ENOMEM;
 935                 goto failed_0;
 936         }
 937
 938         rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
 939                           LNET_PROTO_PING_MATCHBITS, 0,
 940                           LNET_UNLINK, LNET_INS_AFTER,
 941                           &me_handle);
 942         if (rc != 0) {
 943                 CERROR("Can't create ping ME: %d\n", rc);
 944                 goto failed_1;
 945         }
 946
 947         /* initialize md content */
 948         md.start     = *ppinfo;
 949         md.length    = offsetof(lnet_ping_info_t,
 950                                 pi_ni[(*ppinfo)->pi_nnis]);
 951         md.threshold = LNET_MD_THRESH_INF;
 952         md.max_size  = 0;
 953         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
 954                        LNET_MD_MANAGE_REMOTE;
 955         md.user_ptr  = NULL;
 956         md.eq_handle = the_lnet.ln_ping_target_eq;
 957         md.user_ptr = *ppinfo;
 958
 959         rc = LNetMDAttach(me_handle, md, LNET_RETAIN, md_handle);
 960         if (rc != 0) {
 961                 CERROR("Can't attach ping MD: %d\n", rc);
 962                 goto failed_2;
 963         }
 964
 965         return 0;
 966
 967 failed_2:
 968         rc2 = LNetMEUnlink(me_handle);
 969         LASSERT(rc2 == 0);
 970 failed_1:
 971         lnet_ping_info_free(*ppinfo);
 972         *ppinfo = NULL;
 973 failed_0:
 974         if (set_eq)
 975                 LNetEQFree(the_lnet.ln_ping_target_eq);
 976         return rc;
 977 }
 978
 979 static void
 980 lnet_ping_md_unlink(lnet_ping_info_t *pinfo, lnet_handle_md_t *md_handle)
 981 {
 982         sigset_t        blocked = cfs_block_allsigs();
 983
 984         LNetMDUnlink(*md_handle);
 985         LNetInvalidateHandle(md_handle);
 986
 987         /* NB md could be busy; this just starts the unlink */
 988         while (pinfo->pi_features != LNET_PING_FEAT_INVAL) {
 989                 CDEBUG(D_NET, "Still waiting for ping MD to unlink\n");
 990                 cfs_pause(cfs_time_seconds(1));
 991         }
 992
 993         cfs_restore_sigs(blocked);
 994 }
 995
 996 static void
 997 lnet_ping_info_install_locked(lnet_ping_info_t *ping_info)
 998 {
 999         int                     i;
1000         lnet_ni_t               *ni;
1001         lnet_ni_status_t        *ns;
1002
1003         i = 0;
1004         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
1005                 LASSERT(i < ping_info->pi_nnis);
1006
1007                 ns = &ping_info->pi_ni[i];
1008
1009                 ns->ns_nid = ni->ni_nid;
1010
1011                 lnet_ni_lock(ni);
1012                 ns->ns_status = (ni->ni_status != NULL) ?
1013                                 ni->ni_status->ns_status : LNET_NI_STATUS_UP;
1014                 ni->ni_status = ns;
1015                 lnet_ni_unlock(ni);
1016
1017                 i++;
1018         }
1019 }
1020
1021 static void
1022 lnet_ping_target_update(lnet_ping_info_t *pinfo, lnet_handle_md_t md_handle)
1023 {
1024         lnet_ping_info_t *old_pinfo = NULL;
1025         lnet_handle_md_t old_md;
1026
1027         /* switch the NIs to point to the new ping info created */
1028         lnet_net_lock(LNET_LOCK_EX);
1029
1030         if (!the_lnet.ln_routing)
1031                 pinfo->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1032         lnet_ping_info_install_locked(pinfo);
1033
1034         if (the_lnet.ln_ping_info != NULL) {
1035                 old_pinfo = the_lnet.ln_ping_info;
1036                 old_md = the_lnet.ln_ping_target_md;
1037         }
1038         the_lnet.ln_ping_target_md = md_handle;
1039         the_lnet.ln_ping_info = pinfo;
1040
1041         lnet_net_unlock(LNET_LOCK_EX);
1042
1043         if (old_pinfo != NULL) {
1044                 /* unlink the old ping info */
1045                 lnet_ping_md_unlink(old_pinfo, &old_md);
1046                 lnet_ping_info_free(old_pinfo);
1047         }
1048 }
1049
1050 static void
1051 lnet_ping_target_fini(void)
1052 {
1053         int             rc;
1054
1055         lnet_ping_md_unlink(the_lnet.ln_ping_info,
1056                             &the_lnet.ln_ping_target_md);
1057
1058         rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1059         LASSERT(rc == 0);
1060
1061         lnet_ping_info_destroy();
1062 }
1063
1064 static int
1065 lnet_ni_tq_credits(lnet_ni_t *ni)
1066 {
1067         int     credits;
1068
1069         LASSERT(ni->ni_ncpts >= 1);
1070
1071         if (ni->ni_ncpts == 1)
1072                 return ni->ni_maxtxcredits;
1073
1074         credits = ni->ni_maxtxcredits / ni->ni_ncpts;
1075         credits = max(credits, 8 * ni->ni_peertxcredits);
1076         credits = min(credits, ni->ni_maxtxcredits);
1077
1078         return credits;
1079 }
1080
1081 static void
1082 lnet_ni_unlink_locked(lnet_ni_t *ni)
1083 {
1084         if (!list_empty(&ni->ni_cptlist)) {
1085                 list_del_init(&ni->ni_cptlist);
1086                 lnet_ni_decref_locked(ni, 0);
1087         }
1088
1089         /* move it to zombie list and nobody can find it anymore */
1090         LASSERT(!list_empty(&ni->ni_list));
1091         list_move(&ni->ni_list, &the_lnet.ln_nis_zombie);
1092         lnet_ni_decref_locked(ni, 0);   /* drop ln_nis' ref */
1093 }
1094
1095 static void
1096 lnet_clear_zombies_nis_locked(void)
1097 {
1098         int             i;
1099         int             islo;
1100         lnet_ni_t       *ni;
1101
1102         /* Now wait for the NI's I just nuked to show up on ln_zombie_nis
1103          * and shut them down in guaranteed thread context */
1104         i = 2;
1105         while (!list_empty(&the_lnet.ln_nis_zombie)) {
1106                 int     *ref;
1107                 int     j;
1108
1109                 ni = list_entry(the_lnet.ln_nis_zombie.next,
1110                                 lnet_ni_t, ni_list);
1111                 list_del_init(&ni->ni_list);
1112                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
1113                         if (*ref == 0)
1114                                 continue;
1115                         /* still busy, add it back to zombie list */
1116                         list_add(&ni->ni_list, &the_lnet.ln_nis_zombie);
1117                         break;
1118                 }
1119
1120                 if (!list_empty(&ni->ni_list)) {
1121                         lnet_net_unlock(LNET_LOCK_EX);
1122                         ++i;
1123                         if ((i & (-i)) == i) {
1124                                 CDEBUG(D_WARNING,
1125                                        "Waiting for zombie LNI %s\n",
1126                                        libcfs_nid2str(ni->ni_nid));
1127                         }
1128                         cfs_pause(cfs_time_seconds(1));
1129                         lnet_net_lock(LNET_LOCK_EX);
1130                         continue;
1131                 }
1132
1133                 ni->ni_lnd->lnd_refcount--;
1134                 lnet_net_unlock(LNET_LOCK_EX);
1135
1136                 islo = ni->ni_lnd->lnd_type == LOLND;
1137
1138                 LASSERT(!in_interrupt());
1139                 (ni->ni_lnd->lnd_shutdown)(ni);
1140
1141                 /* can't deref lnd anymore now; it might have unregistered
1142                  * itself...  */
1143
1144                 if (!islo)
1145                         CDEBUG(D_LNI, "Removed LNI %s\n",
1146                               libcfs_nid2str(ni->ni_nid));
1147
1148                 lnet_ni_free(ni);
1149                 i = 2;
1150                 lnet_net_lock(LNET_LOCK_EX);
1151         }
1152 }
1153
1154 static void
1155 lnet_shutdown_lndnis(void)
1156 {
1157         int             i;
1158         lnet_ni_t       *ni;
1159
1160         /* NB called holding the global mutex */
1161
1162         /* All quiet on the API front */
1163         LASSERT(!the_lnet.ln_shutdown);
1164         LASSERT(the_lnet.ln_refcount == 0);
1165         LASSERT(list_empty(&the_lnet.ln_nis_zombie));
1166
1167         lnet_net_lock(LNET_LOCK_EX);
1168         the_lnet.ln_shutdown = 1;       /* flag shutdown */
1169
1170         /* Unlink NIs from the global table */
1171         while (!list_empty(&the_lnet.ln_nis)) {
1172                 ni = list_entry(the_lnet.ln_nis.next,
1173                                 lnet_ni_t, ni_list);
1174                 lnet_ni_unlink_locked(ni);
1175         }
1176
1177         /* Drop the cached loopback NI. */
1178         if (the_lnet.ln_loni != NULL) {
1179                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
1180                 the_lnet.ln_loni = NULL;
1181         }
1182
1183         lnet_net_unlock(LNET_LOCK_EX);
1184
1185         /* Clear lazy portals and drop delayed messages which hold refs
1186          * on their lnet_msg_t::msg_rxpeer */
1187         for (i = 0; i < the_lnet.ln_nportals; i++)
1188                 LNetClearLazyPortal(i);
1189
1190         /* Clear the peer table and wait for all peers to go (they hold refs on
1191          * their NIs) */
1192         lnet_peer_tables_cleanup(NULL);
1193
1194         lnet_net_lock(LNET_LOCK_EX);
1195
1196         lnet_clear_zombies_nis_locked();
1197         the_lnet.ln_shutdown = 0;
1198         lnet_net_unlock(LNET_LOCK_EX);
1199 }
1200
1201 /* shutdown down the NI and release refcount */
1202 static void
1203 lnet_shutdown_lndni(struct lnet_ni *ni)
1204 {
1205         int i;
1206
1207         lnet_net_lock(LNET_LOCK_EX);
1208         lnet_ni_unlink_locked(ni);
1209         lnet_net_unlock(LNET_LOCK_EX);
1210
1211         /* clear messages for this NI on the lazy portal */
1212         for (i = 0; i < the_lnet.ln_nportals; i++)
1213                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
1214
1215         /* Do peer table cleanup for this ni */
1216         lnet_peer_tables_cleanup(ni);
1217
1218         lnet_net_lock(LNET_LOCK_EX);
1219         lnet_clear_zombies_nis_locked();
1220         lnet_net_unlock(LNET_LOCK_EX);
1221 }
1222
1223 static int
1224 lnet_startup_lndni(struct lnet_ni *ni, __s32 peer_timeout,
1225                    __s32 peer_cr, __s32 peer_buf_cr, __s32 credits)
1226 {
1227         int                     rc = -EINVAL;
1228         __u32                   lnd_type;
1229         lnd_t                   *lnd;
1230         struct lnet_tx_queue    *tq;
1231         int                     i;
1232
1233         lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
1234
1235         LASSERT(libcfs_isknown_lnd(lnd_type));
1236
1237         if (lnd_type == CIBLND || lnd_type == OPENIBLND ||
1238             lnd_type == IIBLND || lnd_type == VIBLND) {
1239                 CERROR("LND %s obsoleted\n", libcfs_lnd2str(lnd_type));
1240                 goto failed0;
1241         }
1242
1243         /* Make sure this new NI is unique. */
1244         lnet_net_lock(LNET_LOCK_EX);
1245         rc = lnet_net_unique(LNET_NIDNET(ni->ni_nid), &the_lnet.ln_nis);
1246         lnet_net_unlock(LNET_LOCK_EX);
1247
1248         if (!rc) {
1249                 if (lnd_type == LOLND) {
1250                         lnet_ni_free(ni);
1251                         return 0;
1252                 }
1253
1254                 CERROR("Net %s is not unique\n",
1255                        libcfs_net2str(LNET_NIDNET(ni->ni_nid)));
1256
1257                 rc = -EEXIST;
1258                 goto failed0;
1259         }
1260
1261         LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1262         lnd = lnet_find_lnd_by_type(lnd_type);
1263
1264         if (lnd == NULL) {
1265                 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1266                 rc = request_module("%s", libcfs_lnd2modname(lnd_type));
1267                 LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1268
1269                 lnd = lnet_find_lnd_by_type(lnd_type);
1270                 if (lnd == NULL) {
1271                         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1272                         CERROR("Can't load LND %s, module %s, rc=%d\n",
1273                                libcfs_lnd2str(lnd_type),
1274                                libcfs_lnd2modname(lnd_type), rc);
1275 #ifndef HAVE_MODULE_LOADING_SUPPORT
1276                         LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
1277                                            "compiled with kernel module "
1278                                            "loading support.");
1279 #endif
1280                         rc = -EINVAL;
1281                         goto failed0;
1282                 }
1283         }
1284
1285         lnet_net_lock(LNET_LOCK_EX);
1286         lnd->lnd_refcount++;
1287         lnet_net_unlock(LNET_LOCK_EX);
1288
1289         ni->ni_lnd = lnd;
1290
1291         rc = (lnd->lnd_startup)(ni);
1292
1293         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1294
1295         if (rc != 0) {
1296                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
1297                                    rc, libcfs_lnd2str(lnd->lnd_type));
1298                 lnet_net_lock(LNET_LOCK_EX);
1299                 lnd->lnd_refcount--;
1300                 lnet_net_unlock(LNET_LOCK_EX);
1301                 goto failed0;
1302         }
1303
1304         /* If given some LND tunable parameters, parse those now to
1305          * override the values in the NI structure. */
1306         if (peer_buf_cr >= 0)
1307                 ni->ni_peerrtrcredits = peer_buf_cr;
1308         if (peer_timeout >= 0)
1309                 ni->ni_peertimeout = peer_timeout;
1310         /*
1311          * TODO
1312          * Note: For now, don't allow the user to change
1313          * peertxcredits as this number is used in the
1314          * IB LND to control queue depth.
1315          * if (peer_cr != -1)
1316          *      ni->ni_peertxcredits = peer_cr;
1317          */
1318         if (credits >= 0)
1319                 ni->ni_maxtxcredits = credits;
1320
1321         LASSERT(ni->ni_peertimeout <= 0 || lnd->lnd_query != NULL);
1322
1323         lnet_net_lock(LNET_LOCK_EX);
1324         /* refcount for ln_nis */
1325         lnet_ni_addref_locked(ni, 0);
1326         list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1327         if (ni->ni_cpts != NULL) {
1328                 lnet_ni_addref_locked(ni, 0);
1329                 list_add_tail(&ni->ni_cptlist, &the_lnet.ln_nis_cpt);
1330         }
1331
1332         lnet_net_unlock(LNET_LOCK_EX);
1333
1334         if (lnd->lnd_type == LOLND) {
1335                 lnet_ni_addref(ni);
1336                 LASSERT(the_lnet.ln_loni == NULL);
1337                 the_lnet.ln_loni = ni;
1338                 return 0;
1339         }
1340
1341         if (ni->ni_peertxcredits == 0 || ni->ni_maxtxcredits == 0) {
1342                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1343                                    libcfs_lnd2str(lnd->lnd_type),
1344                                    ni->ni_peertxcredits == 0 ?
1345                                         "" : "per-peer ");
1346                 /* shutdown the NI since if we get here then it must've already
1347                  * been started
1348                  */
1349                 lnet_shutdown_lndni(ni);
1350                 return -EINVAL;
1351         }
1352
1353         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1354                 tq->tq_credits_min =
1355                 tq->tq_credits_max =
1356                 tq->tq_credits = lnet_ni_tq_credits(ni);
1357         }
1358
1359         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1360                 libcfs_nid2str(ni->ni_nid), ni->ni_peertxcredits,
1361                 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1362                 ni->ni_peerrtrcredits, ni->ni_peertimeout);
1363
1364         return 0;
1365 failed0:
1366         lnet_ni_free(ni);
1367         return rc;
1368 }
1369
1370 static int
1371 lnet_startup_lndnis(struct list_head *nilist)
1372 {
1373         struct lnet_ni          *ni;
1374         int                     rc;
1375         int                     ni_count = 0;
1376
1377         while (!list_empty(nilist)) {
1378                 ni = list_entry(nilist->next, lnet_ni_t, ni_list);
1379                 list_del(&ni->ni_list);
1380                 rc = lnet_startup_lndni(ni, -1, -1, -1, -1);
1381
1382                 if (rc < 0)
1383                         goto failed;
1384
1385                 ni_count++;
1386         }
1387
1388         return ni_count;
1389 failed:
1390         lnet_shutdown_lndnis();
1391
1392         return rc;
1393 }
1394
1395 /**
1396  * Initialize LNet library.
1397  *
1398  * Automatically called at module loading time. Caller has to call
1399  * lnet_fini() after a call to lnet_init(), if and only if the latter
1400  * returned 0. It must be called exactly once.
1401  *
1402  * \return 0 on success, and -ve on failures.
1403  */
1404 int
1405 lnet_init(void)
1406 {
1407         int     rc;
1408
1409         lnet_assert_wire_constants();
1410
1411         memset(&the_lnet, 0, sizeof(the_lnet));
1412
1413         /* refer to global cfs_cpt_table for now */
1414         the_lnet.ln_cpt_table   = cfs_cpt_table;
1415         the_lnet.ln_cpt_number  = cfs_cpt_number(cfs_cpt_table);
1416
1417         LASSERT(the_lnet.ln_cpt_number > 0);
1418         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1419                 /* we are under risk of consuming all lh_cookie */
1420                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
1421                        "please change setting of CPT-table and retry\n",
1422                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
1423                 return -1;
1424         }
1425
1426         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1427                 the_lnet.ln_cpt_bits++;
1428
1429         rc = lnet_create_locks();
1430         if (rc != 0) {
1431                 CERROR("Can't create LNet global locks: %d\n", rc);
1432                 return -1;
1433         }
1434
1435         the_lnet.ln_refcount = 0;
1436         LNetInvalidateHandle(&the_lnet.ln_rc_eqh);
1437         INIT_LIST_HEAD(&the_lnet.ln_lnds);
1438         INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1439         INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1440
1441         /* The hash table size is the number of bits it takes to express the set
1442          * ln_num_routes, minus 1 (better to under estimate than over so we
1443          * don't waste memory). */
1444         if (rnet_htable_size <= 0)
1445                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
1446         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
1447                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
1448         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
1449                                            order_base_2(rnet_htable_size) - 1);
1450
1451         /* All LNDs apart from the LOLND are in separate modules.  They
1452          * register themselves when their module loads, and unregister
1453          * themselves when their module is unloaded. */
1454         lnet_register_lnd(&the_lolnd);
1455         return 0;
1456 }
1457
1458 /**
1459  * Finalize LNet library.
1460  *
1461  * \pre lnet_init() called with success.
1462  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1463  */
1464 void
1465 lnet_fini(void)
1466 {
1467         LASSERT(the_lnet.ln_refcount == 0);
1468
1469         while (!list_empty(&the_lnet.ln_lnds))
1470                 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1471                                                lnd_t, lnd_list));
1472         lnet_destroy_locks();
1473 }
1474
1475 /**
1476  * Set LNet PID and start LNet interfaces, routing, and forwarding.
1477  *
1478  * Users must call this function at least once before any other functions.
1479  * For each successful call there must be a corresponding call to
1480  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1481  * ignored.
1482  *
1483  * The PID used by LNet may be different from the one requested.
1484  * See LNetGetId().
1485  *
1486  * \param requested_pid PID requested by the caller.
1487  *
1488  * \return >= 0 on success, and < 0 error code on failures.
1489  */
1490 int
1491 LNetNIInit(lnet_pid_t requested_pid)
1492 {
1493         int                     im_a_router = 0;
1494         int                     rc;
1495         int                     ni_count;
1496         lnet_ping_info_t        *pinfo;
1497         lnet_handle_md_t        md_handle;
1498         struct list_head        net_head;
1499
1500         INIT_LIST_HEAD(&net_head);
1501
1502         LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1503
1504         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1505
1506         if (the_lnet.ln_refcount > 0) {
1507                 rc = the_lnet.ln_refcount++;
1508                 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1509                 return rc;
1510         }
1511
1512         rc = lnet_prepare(requested_pid);
1513         if (rc != 0) {
1514                 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1515                 return rc;
1516         }
1517
1518         /* Add in the loopback network */
1519         if (lnet_ni_alloc(LNET_MKNET(LOLND, 0), NULL, &net_head) == NULL) {
1520                 rc = -ENOMEM;
1521                 goto failed0;
1522         }
1523
1524         /* If LNet is being initialized via DLC it is possible
1525          * that the user requests not to load module parameters (ones which
1526          * are supported by DLC) on initialization.  Therefore, make sure not
1527          * to load networks, routes and forwarding from module parameters
1528          * in this case.  On cleanup in case of failure only clean up
1529          * routes if it has been loaded */
1530         if (!the_lnet.ln_nis_from_mod_params) {
1531                 rc = lnet_parse_networks(&net_head,
1532                                          lnet_get_networks());
1533                 if (rc < 0)
1534                         goto failed0;
1535         }
1536
1537         ni_count = lnet_startup_lndnis(&net_head);
1538         if (ni_count < 0) {
1539                 rc = ni_count;
1540                 goto failed0;
1541         }
1542
1543         if (!the_lnet.ln_nis_from_mod_params) {
1544                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1545                 if (rc != 0)
1546                         goto failed1;
1547
1548                 rc = lnet_check_routes();
1549                 if (rc != 0)
1550                         goto failed2;
1551
1552                 rc = lnet_rtrpools_alloc(im_a_router);
1553                 if (rc != 0)
1554                         goto failed2;
1555         }
1556
1557         rc = lnet_acceptor_start();
1558         if (rc != 0)
1559                 goto failed2;
1560         the_lnet.ln_refcount = 1;
1561         /* Now I may use my own API functions... */
1562
1563         rc = lnet_ping_info_setup(&pinfo, &md_handle, ni_count, true);
1564         if (rc != 0)
1565                 goto failed3;
1566
1567         lnet_ping_target_update(pinfo, md_handle);
1568
1569         rc = lnet_router_checker_start();
1570         if (rc != 0)
1571                 goto failed4;
1572
1573         lnet_fault_init();
1574         lnet_proc_init();
1575
1576         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1577
1578         return 0;
1579
1580 failed4:
1581         lnet_ping_target_fini();
1582 failed3:
1583         the_lnet.ln_refcount = 0;
1584         lnet_acceptor_stop();
1585 failed2:
1586         if (!the_lnet.ln_nis_from_mod_params)
1587                 lnet_destroy_routes();
1588 failed1:
1589         lnet_shutdown_lndnis();
1590 failed0:
1591         lnet_unprepare();
1592         LASSERT(rc < 0);
1593         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1594         while (!list_empty(&net_head)) {
1595                 struct lnet_ni *ni;
1596                 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1597                 list_del_init(&ni->ni_list);
1598                 lnet_ni_free(ni);
1599         }
1600         return rc;
1601 }
1602 EXPORT_SYMBOL(LNetNIInit);
1603
1604 /**
1605  * Stop LNet interfaces, routing, and forwarding.
1606  *
1607  * Users must call this function once for each successful call to LNetNIInit().
1608  * Once the LNetNIFini() operation has been started, the results of pending
1609  * API operations are undefined.
1610  *
1611  * \return always 0 for current implementation.
1612  */
1613 int
1614 LNetNIFini()
1615 {
1616         LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1617
1618         LASSERT (the_lnet.ln_refcount > 0);
1619
1620         if (the_lnet.ln_refcount != 1) {
1621                 the_lnet.ln_refcount--;
1622         } else {
1623                 LASSERT(!the_lnet.ln_niinit_self);
1624
1625                 lnet_fault_fini();
1626
1627                 lnet_proc_fini();
1628                 lnet_router_checker_stop();
1629                 lnet_ping_target_fini();
1630
1631                 /* Teardown fns that use my own API functions BEFORE here */
1632                 the_lnet.ln_refcount = 0;
1633
1634                 lnet_acceptor_stop();
1635                 lnet_destroy_routes();
1636                 lnet_shutdown_lndnis();
1637                 lnet_unprepare();
1638         }
1639
1640         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1641         return 0;
1642 }
1643 EXPORT_SYMBOL(LNetNIFini);
1644
1645 /**
1646  * Grabs the ni data from the ni structure and fills the out
1647  * parameters
1648  *
1649  * \param[in] ni network        interface structure
1650  * \param[out] cpt_count        the number of cpts the ni is on
1651  * \param[out] nid              Network Interface ID
1652  * \param[out] peer_timeout     NI peer timeout
1653  * \param[out] peer_tx_crdits   NI peer transmit credits
1654  * \param[out] peer_rtr_credits NI peer router credits
1655  * \param[out] max_tx_credits   NI max transmit credit
1656  * \param[out] net_config       Network configuration
1657  */
1658 static void
1659 lnet_fill_ni_info(struct lnet_ni *ni, __u32 *cpt_count, __u64 *nid,
1660                   int *peer_timeout, int *peer_tx_credits,
1661                   int *peer_rtr_credits, int *max_tx_credits,
1662                   struct lnet_ioctl_net_config *net_config)
1663 {
1664         int i;
1665
1666         if (ni == NULL)
1667                 return;
1668
1669         if (net_config == NULL)
1670                 return;
1671
1672         CLASSERT(ARRAY_SIZE(ni->ni_interfaces) ==
1673                  ARRAY_SIZE(net_config->ni_interfaces));
1674
1675         if (ni->ni_interfaces[0] != NULL) {
1676                 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
1677                         if (ni->ni_interfaces[i] != NULL) {
1678                                 strncpy(net_config->ni_interfaces[i],
1679                                         ni->ni_interfaces[i],
1680                                         sizeof(net_config->ni_interfaces[i]));
1681                         }
1682                 }
1683         }
1684
1685         *nid = ni->ni_nid;
1686         *peer_timeout = ni->ni_peertimeout;
1687         *peer_tx_credits = ni->ni_peertxcredits;
1688         *peer_rtr_credits = ni->ni_peerrtrcredits;
1689         *max_tx_credits = ni->ni_maxtxcredits;
1690
1691         net_config->ni_status = ni->ni_status->ns_status;
1692
1693         for (i = 0;
1694              ni->ni_cpts != NULL && i < ni->ni_ncpts &&
1695              i < LNET_MAX_SHOW_NUM_CPT;
1696              i++)
1697                 net_config->ni_cpts[i] = ni->ni_cpts[i];
1698
1699         *cpt_count = ni->ni_ncpts;
1700 }
1701
1702 int
1703 lnet_get_net_config(int idx, __u32 *cpt_count, __u64 *nid, int *peer_timeout,
1704                     int *peer_tx_credits, int *peer_rtr_credits,
1705                     int *max_tx_credits,
1706                     struct lnet_ioctl_net_config *net_config)
1707 {
1708         struct lnet_ni          *ni;
1709         struct list_head        *tmp;
1710         int                     cpt;
1711         int                     rc = -ENOENT;
1712
1713         cpt = lnet_net_lock_current();
1714
1715         list_for_each(tmp, &the_lnet.ln_nis) {
1716                 ni = list_entry(tmp, lnet_ni_t, ni_list);
1717                 if (idx-- == 0) {
1718                         rc = 0;
1719                         lnet_ni_lock(ni);
1720                         lnet_fill_ni_info(ni, cpt_count, nid, peer_timeout,
1721                                           peer_tx_credits, peer_rtr_credits,
1722                                           max_tx_credits, net_config);
1723                         lnet_ni_unlock(ni);
1724                         break;
1725                 }
1726         }
1727
1728         lnet_net_unlock(cpt);
1729         return rc;
1730 }
1731
1732 int
1733 lnet_dyn_add_ni(lnet_pid_t requested_pid, char *nets,
1734                 __s32 peer_timeout, __s32 peer_cr, __s32 peer_buf_cr,
1735                 __s32 credits)
1736 {
1737         lnet_ping_info_t        *pinfo;
1738         lnet_handle_md_t        md_handle;
1739         struct lnet_ni          *ni;
1740         struct list_head        net_head;
1741         int                     rc;
1742         lnet_remotenet_t        *rnet;
1743
1744         INIT_LIST_HEAD(&net_head);
1745
1746         /* Create a ni structure for the network string */
1747         rc = lnet_parse_networks(&net_head, nets);
1748         if (rc <= 0)
1749                 return rc == 0 ? -EINVAL : rc;
1750
1751         LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1752
1753         if (rc > 1) {
1754                 rc = -EINVAL; /* only add one interface per call */
1755                 goto failed0;
1756         }
1757
1758         ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1759
1760         lnet_net_lock(LNET_LOCK_EX);
1761         rnet = lnet_find_net_locked(LNET_NIDNET(ni->ni_nid));
1762         lnet_net_unlock(LNET_LOCK_EX);
1763         /* make sure that the net added doesn't invalidate the current
1764          * configuration LNet is keeping */
1765         if (rnet != NULL) {
1766                 CERROR("Adding net %s will invalidate routing configuration\n",
1767                        nets);
1768                 rc = -EUSERS;
1769                 goto failed0;
1770         }
1771
1772         rc = lnet_ping_info_setup(&pinfo, &md_handle, 1 + lnet_get_ni_count(),
1773                                   false);
1774         if (rc != 0)
1775                 goto failed0;
1776
1777         list_del_init(&ni->ni_list);
1778
1779         rc = lnet_startup_lndni(ni, peer_timeout, peer_cr,
1780                                 peer_buf_cr, credits);
1781         if (rc != 0)
1782                 goto failed1;
1783
1784         if (ni->ni_lnd->lnd_accept != NULL) {
1785                 rc = lnet_acceptor_start();
1786                 if (rc < 0) {
1787                         /* shutdown the ni that we just started */
1788                         CERROR("Failed to start up acceptor thread\n");
1789                         lnet_shutdown_lndni(ni);
1790                         goto failed1;
1791                 }
1792         }
1793
1794         lnet_ping_target_update(pinfo, md_handle);
1795         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1796
1797         return 0;
1798
1799 failed1:
1800         lnet_ping_md_unlink(pinfo, &md_handle);
1801         lnet_ping_info_free(pinfo);
1802 failed0:
1803         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1804         while (!list_empty(&net_head)) {
1805                 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1806                 list_del_init(&ni->ni_list);
1807                 lnet_ni_free(ni);
1808         }
1809         return rc;
1810 }
1811
1812 int
1813 lnet_dyn_del_ni(__u32 net)
1814 {
1815         lnet_ni_t        *ni;
1816         lnet_ping_info_t *pinfo;
1817         lnet_handle_md_t  md_handle;
1818         int               rc;
1819
1820         /* don't allow userspace to shutdown the LOLND */
1821         if (LNET_NETTYP(net) == LOLND)
1822                 return -EINVAL;
1823
1824         LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1825         /* create and link a new ping info, before removing the old one */
1826         rc = lnet_ping_info_setup(&pinfo, &md_handle,
1827                                   lnet_get_ni_count() - 1, false);
1828         if (rc != 0)
1829                 goto out;
1830
1831         ni = lnet_net2ni(net);
1832         if (ni == NULL) {
1833                 rc = -EINVAL;
1834                 goto failed;
1835         }
1836
1837         /* decrement the reference counter taken by lnet_net2ni() */
1838         lnet_ni_decref_locked(ni, 0);
1839
1840         lnet_shutdown_lndni(ni);
1841
1842         if (lnet_count_acceptor_nis() == 0)
1843                 lnet_acceptor_stop();
1844
1845         lnet_ping_target_update(pinfo, md_handle);
1846         goto out;
1847 failed:
1848         lnet_ping_md_unlink(pinfo, &md_handle);
1849         lnet_ping_info_free(pinfo);
1850 out:
1851         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1852
1853         return rc;
1854 }
1855
1856 /**
1857  * This is an ugly hack to export IOC_LIBCFS_DEBUG_PEER and
1858  * IOC_LIBCFS_PORTALS_COMPATIBILITY commands to users, by tweaking the LNet
1859  * internal ioctl handler.
1860  *
1861  * IOC_LIBCFS_PORTALS_COMPATIBILITY is now deprecated, don't use it.
1862  *
1863  * \param cmd IOC_LIBCFS_DEBUG_PEER to print debugging data about a peer.
1864  * The data will be printed to system console. Don't use it excessively.
1865  * \param arg A pointer to lnet_process_id_t, process ID of the peer.
1866  *
1867  * \return Always return 0 when called by users directly (i.e., not via ioctl).
1868  */
1869 int
1870 LNetCtl(unsigned int cmd, void *arg)
1871 {
1872         struct libcfs_ioctl_data *data = arg;
1873         struct lnet_ioctl_config_data *config;
1874         lnet_process_id_t         id = {0};
1875         lnet_ni_t                *ni;
1876         int                       rc;
1877
1878         CLASSERT(LIBCFS_IOC_DATA_MAX >= sizeof(struct lnet_ioctl_net_config) +
1879                                         sizeof(struct lnet_ioctl_config_data));
1880
1881         switch (cmd) {
1882         case IOC_LIBCFS_GET_NI:
1883                 rc = LNetGetId(data->ioc_count, &id);
1884                 data->ioc_nid = id.nid;
1885                 return rc;
1886
1887         case IOC_LIBCFS_FAIL_NID:
1888                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1889
1890         case IOC_LIBCFS_ADD_ROUTE:
1891                 config = arg;
1892
1893                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1894                         return -EINVAL;
1895
1896                 LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1897                 rc = lnet_add_route(config->cfg_net,
1898                                     config->cfg_config_u.cfg_route.rtr_hop,
1899                                     config->cfg_nid,
1900                                     config->cfg_config_u.cfg_route.
1901                                         rtr_priority);
1902                 if (rc == 0) {
1903                         rc = lnet_check_routes();
1904                         if (rc != 0)
1905                                 lnet_del_route(config->cfg_net,
1906                                                config->cfg_nid);
1907                 }
1908                 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1909                 return rc;
1910
1911         case IOC_LIBCFS_DEL_ROUTE:
1912                 config = arg;
1913
1914                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1915                         return -EINVAL;
1916
1917                 LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1918                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
1919                 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1920                 return rc;
1921
1922         case IOC_LIBCFS_GET_ROUTE:
1923                 config = arg;
1924
1925                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1926                         return -EINVAL;
1927
1928                 return lnet_get_route(config->cfg_count,
1929                                       &config->cfg_net,
1930                                       &config->cfg_config_u.cfg_route.rtr_hop,
1931                                       &config->cfg_nid,
1932                                       &config->cfg_config_u.cfg_route.rtr_flags,
1933                                       &config->cfg_config_u.cfg_route.
1934                                         rtr_priority);
1935
1936         case IOC_LIBCFS_GET_NET: {
1937                 struct lnet_ioctl_net_config *net_config;
1938                 size_t total = sizeof(*config) + sizeof(*net_config);
1939
1940                 config = arg;
1941
1942                 if (config->cfg_hdr.ioc_len < total)
1943                         return -EINVAL;
1944
1945                 net_config = (struct lnet_ioctl_net_config *)
1946                         config->cfg_bulk;
1947                 if (config == NULL || net_config == NULL)
1948                         return -1;
1949
1950                 return lnet_get_net_config(config->cfg_count,
1951                                            &config->cfg_ncpts,
1952                                            &config->cfg_nid,
1953                                            &config->cfg_config_u.
1954                                                 cfg_net.net_peer_timeout,
1955                                            &config->cfg_config_u.cfg_net.
1956                                                 net_peer_tx_credits,
1957                                            &config->cfg_config_u.cfg_net.
1958                                                 net_peer_rtr_credits,
1959                                            &config->cfg_config_u.cfg_net.
1960                                                 net_max_tx_credits,
1961                                            net_config);
1962         }
1963
1964         case IOC_LIBCFS_GET_LNET_STATS:
1965         {
1966                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
1967
1968                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
1969                         return -EINVAL;
1970
1971                 lnet_counters_get(&lnet_stats->st_cntrs);
1972                 return 0;
1973         }
1974
1975         case IOC_LIBCFS_CONFIG_RTR:
1976                 config = arg;
1977
1978                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1979                         return -EINVAL;
1980
1981                 LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1982                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
1983                         rc = lnet_rtrpools_enable();
1984                         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1985                         return rc;
1986                 }
1987                 lnet_rtrpools_disable();
1988                 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1989                 return 0;
1990
1991         case IOC_LIBCFS_ADD_BUF:
1992                 config = arg;
1993
1994                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1995                         return -EINVAL;
1996
1997                 LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1998                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.
1999                                                 buf_tiny,
2000                                           config->cfg_config_u.cfg_buffers.
2001                                                 buf_small,
2002                                           config->cfg_config_u.cfg_buffers.
2003                                                 buf_large);
2004                 LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
2005                 return rc;
2006
2007         case IOC_LIBCFS_GET_BUF: {
2008                 struct lnet_ioctl_pool_cfg *pool_cfg;
2009                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
2010
2011                 config = arg;
2012
2013                 if (config->cfg_hdr.ioc_len < total)
2014                         return -EINVAL;
2015
2016                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
2017                 return lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
2018         }
2019
2020         case IOC_LIBCFS_GET_PEER_INFO: {
2021                 struct lnet_ioctl_peer *peer_info = arg;
2022
2023                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
2024                         return -EINVAL;
2025
2026                 return lnet_get_peer_info(
2027                    peer_info->pr_count,
2028                    &peer_info->pr_nid,
2029                    peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
2030                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
2031                    &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
2032                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
2033                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
2034                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
2035                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_rtr_credits,
2036                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
2037         }
2038
2039         case IOC_LIBCFS_NOTIFY_ROUTER:
2040                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
2041                                    cfs_time_current() -
2042                                    cfs_time_seconds(cfs_time_current_sec() -
2043                                                     (time_t)data->ioc_u64[0]));
2044
2045         case IOC_LIBCFS_PORTALS_COMPATIBILITY:
2046                 /* This can be removed once lustre stops calling it */
2047                 return 0;
2048
2049         case IOC_LIBCFS_LNET_DIST:
2050                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
2051                 if (rc < 0 && rc != -EHOSTUNREACH)
2052                         return rc;
2053
2054                 data->ioc_u32[0] = rc;
2055                 return 0;
2056
2057         case IOC_LIBCFS_TESTPROTOCOMPAT:
2058                 lnet_net_lock(LNET_LOCK_EX);
2059                 the_lnet.ln_testprotocompat = data->ioc_flags;
2060                 lnet_net_unlock(LNET_LOCK_EX);
2061                 return 0;
2062
2063         case IOC_LIBCFS_LNET_FAULT:
2064                 return lnet_fault_ctl(data->ioc_flags, data);
2065
2066         case IOC_LIBCFS_PING:
2067                 id.nid = data->ioc_nid;
2068                 id.pid = data->ioc_u32[0];
2069                 rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
2070                                (lnet_process_id_t __user *)data->ioc_pbuf1,
2071                                data->ioc_plen1/sizeof(lnet_process_id_t));
2072                 if (rc < 0)
2073                         return rc;
2074                 data->ioc_count = rc;
2075                 return 0;
2076
2077         case IOC_LIBCFS_DEBUG_PEER: {
2078                 /* CAVEAT EMPTOR: this one designed for calling directly; not
2079                  * via an ioctl */
2080                 id = *((lnet_process_id_t *) arg);
2081
2082                 lnet_debug_peer(id.nid);
2083
2084                 ni = lnet_net2ni(LNET_NIDNET(id.nid));
2085                 if (ni == NULL) {
2086                         CDEBUG(D_WARNING, "No NI for %s\n", libcfs_id2str(id));
2087                 } else {
2088                         if (ni->ni_lnd->lnd_ctl == NULL) {
2089                                 CDEBUG(D_WARNING, "No ctl for %s\n",
2090                                        libcfs_id2str(id));
2091                         } else {
2092                                 (void)ni->ni_lnd->lnd_ctl(ni, cmd, arg);
2093                         }
2094
2095                         lnet_ni_decref(ni);
2096                 }
2097                 return 0;
2098         }
2099
2100         default:
2101                 ni = lnet_net2ni(data->ioc_net);
2102                 if (ni == NULL)
2103                         return -EINVAL;
2104
2105                 if (ni->ni_lnd->lnd_ctl == NULL)
2106                         rc = -EINVAL;
2107                 else
2108                         rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
2109
2110                 lnet_ni_decref(ni);
2111                 return rc;
2112         }
2113         /* not reached */
2114 }
2115 EXPORT_SYMBOL(LNetCtl);
2116
2117 /**
2118  * Retrieve the lnet_process_id_t ID of LNet interface at \a index. Note that
2119  * all interfaces share a same PID, as requested by LNetNIInit().
2120  *
2121  * \param index Index of the interface to look up.
2122  * \param id On successful return, this location will hold the
2123  * lnet_process_id_t ID of the interface.
2124  *
2125  * \retval 0 If an interface exists at \a index.
2126  * \retval -ENOENT If no interface has been found.
2127  */
2128 int
2129 LNetGetId(unsigned int index, lnet_process_id_t *id)
2130 {
2131         struct lnet_ni   *ni;
2132         struct list_head *tmp;
2133         int               cpt;
2134         int               rc = -ENOENT;
2135
2136         LASSERT(the_lnet.ln_refcount > 0);
2137
2138         cpt = lnet_net_lock_current();
2139
2140         list_for_each(tmp, &the_lnet.ln_nis) {
2141                 if (index-- != 0)
2142                         continue;
2143
2144                 ni = list_entry(tmp, lnet_ni_t, ni_list);
2145
2146                 id->nid = ni->ni_nid;
2147                 id->pid = the_lnet.ln_pid;
2148                 rc = 0;
2149                 break;
2150         }
2151
2152         lnet_net_unlock(cpt);
2153         return rc;
2154 }
2155 EXPORT_SYMBOL(LNetGetId);
2156
2157 /**
2158  * Print a string representation of handle \a h into buffer \a str of
2159  * \a len bytes.
2160  */
2161 void
2162 LNetSnprintHandle(char *str, int len, lnet_handle_any_t h)
2163 {
2164         snprintf(str, len, LPX64, h.cookie);
2165 }
2166 EXPORT_SYMBOL(LNetSnprintHandle);
2167
2168 static int
2169 lnet_ping(lnet_process_id_t id, int timeout_ms, lnet_process_id_t __user *ids,
2170           int n_ids)
2171 {
2172         lnet_handle_eq_t     eqh;
2173         lnet_handle_md_t     mdh;
2174         lnet_event_t         event;
2175         lnet_md_t            md = { NULL };
2176         int                  which;
2177         int                  unlinked = 0;
2178         int                  replied = 0;
2179         const int            a_long_time = 60000; /* mS */
2180         int                  infosz;
2181         lnet_ping_info_t    *info;
2182         lnet_process_id_t    tmpid;
2183         int                  i;
2184         int                  nob;
2185         int                  rc;
2186         int                  rc2;
2187         sigset_t         blocked;
2188
2189         infosz = offsetof(lnet_ping_info_t, pi_ni[n_ids]);
2190
2191         if (n_ids <= 0 ||
2192             id.nid == LNET_NID_ANY ||
2193             timeout_ms > 500000 ||              /* arbitrary limit! */
2194             n_ids > 20)                         /* arbitrary limit! */
2195                 return -EINVAL;
2196
2197         if (id.pid == LNET_PID_ANY)
2198                 id.pid = LNET_PID_LUSTRE;
2199
2200         LIBCFS_ALLOC(info, infosz);
2201         if (info == NULL)
2202                 return -ENOMEM;
2203
2204         /* NB 2 events max (including any unlink event) */
2205         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
2206         if (rc != 0) {
2207                 CERROR("Can't allocate EQ: %d\n", rc);
2208                 goto out_0;
2209         }
2210
2211         /* initialize md content */
2212         md.start     = info;
2213         md.length    = infosz;
2214         md.threshold = 2; /*GET/REPLY*/
2215         md.max_size  = 0;
2216         md.options   = LNET_MD_TRUNCATE;
2217         md.user_ptr  = NULL;
2218         md.eq_handle = eqh;
2219
2220         rc = LNetMDBind(md, LNET_UNLINK, &mdh);
2221         if (rc != 0) {
2222                 CERROR("Can't bind MD: %d\n", rc);
2223                 goto out_1;
2224         }
2225
2226         rc = LNetGet(LNET_NID_ANY, mdh, id,
2227                      LNET_RESERVED_PORTAL,
2228                      LNET_PROTO_PING_MATCHBITS, 0);
2229
2230         if (rc != 0) {
2231                 /* Don't CERROR; this could be deliberate! */
2232
2233                 rc2 = LNetMDUnlink(mdh);
2234                 LASSERT(rc2 == 0);
2235
2236                 /* NB must wait for the UNLINK event below... */
2237                 unlinked = 1;
2238                 timeout_ms = a_long_time;
2239         }
2240
2241         do {
2242                 /* MUST block for unlink to complete */
2243                 if (unlinked)
2244                         blocked = cfs_block_allsigs();
2245
2246                 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
2247
2248                 if (unlinked)
2249                         cfs_restore_sigs(blocked);
2250
2251                 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
2252                        (rc2 <= 0) ? -1 : event.type,
2253                        (rc2 <= 0) ? -1 : event.status,
2254                        (rc2 > 0 && event.unlinked) ? " unlinked" : "");
2255
2256                 LASSERT(rc2 != -EOVERFLOW);     /* can't miss anything */
2257
2258                 if (rc2 <= 0 || event.status != 0) {
2259                         /* timeout or error */
2260                         if (!replied && rc == 0)
2261                                 rc = (rc2 < 0) ? rc2 :
2262                                      (rc2 == 0) ? -ETIMEDOUT :
2263                                      event.status;
2264
2265                         if (!unlinked) {
2266                                 /* Ensure completion in finite time... */
2267                                 LNetMDUnlink(mdh);
2268                                 /* No assertion (racing with network) */
2269                                 unlinked = 1;
2270                                 timeout_ms = a_long_time;
2271                         } else if (rc2 == 0) {
2272                                 /* timed out waiting for unlink */
2273                                 CWARN("ping %s: late network completion\n",
2274                                       libcfs_id2str(id));
2275                         }
2276                 } else if (event.type == LNET_EVENT_REPLY) {
2277                         replied = 1;
2278                         rc = event.mlength;
2279                 }
2280
2281         } while (rc2 <= 0 || !event.unlinked);
2282
2283         if (!replied) {
2284                 if (rc >= 0)
2285                         CWARN("%s: Unexpected rc >= 0 but no reply!\n",
2286                               libcfs_id2str(id));
2287                 rc = -EIO;
2288                 goto out_1;
2289         }
2290
2291         nob = rc;
2292         LASSERT(nob >= 0 && nob <= infosz);
2293
2294         rc = -EPROTO;                           /* if I can't parse... */
2295
2296         if (nob < 8) {
2297                 /* can't check magic/version */
2298                 CERROR("%s: ping info too short %d\n",
2299                        libcfs_id2str(id), nob);
2300                 goto out_1;
2301         }
2302
2303         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
2304                 lnet_swap_pinginfo(info);
2305         } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
2306                 CERROR("%s: Unexpected magic %08x\n",
2307                        libcfs_id2str(id), info->pi_magic);
2308                 goto out_1;
2309         }
2310
2311         if ((info->pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
2312                 CERROR("%s: ping w/o NI status: 0x%x\n",
2313                        libcfs_id2str(id), info->pi_features);
2314                 goto out_1;
2315         }
2316
2317         if (nob < offsetof(lnet_ping_info_t, pi_ni[0])) {
2318                 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
2319                        nob, (int)offsetof(lnet_ping_info_t, pi_ni[0]));
2320                 goto out_1;
2321         }
2322
2323         if (info->pi_nnis < n_ids)
2324                 n_ids = info->pi_nnis;
2325
2326         if (nob < offsetof(lnet_ping_info_t, pi_ni[n_ids])) {
2327                 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
2328                        nob, (int)offsetof(lnet_ping_info_t, pi_ni[n_ids]));
2329                 goto out_1;
2330         }
2331
2332         rc = -EFAULT;                           /* If I SEGV... */
2333
2334         for (i = 0; i < n_ids; i++) {
2335                 tmpid.pid = info->pi_pid;
2336                 tmpid.nid = info->pi_ni[i].ns_nid;
2337                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
2338                         goto out_1;
2339         }
2340         rc = info->pi_nnis;
2341
2342  out_1:
2343         rc2 = LNetEQFree(eqh);
2344         if (rc2 != 0)
2345                 CERROR("rc2 %d\n", rc2);
2346         LASSERT(rc2 == 0);
2347
2348  out_0:
2349         LIBCFS_FREE(info, infosz);
2350         return rc;
2351 }