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, 2015, 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 module_param(ip2nets, charp, 0444);
  48 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
  49
  50 static char *networks = "";
  51 module_param(networks, charp, 0444);
  52 MODULE_PARM_DESC(networks, "local networks");
  53
  54 static char *routes = "";
  55 module_param(routes, charp, 0444);
  56 MODULE_PARM_DESC(routes, "routes to non-local networks");
  57
  58 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
  59 module_param(rnet_htable_size, int, 0444);
  60 MODULE_PARM_DESC(rnet_htable_size, "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 __user *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 struct kmem_cache *lnet_mes_cachep;        /* MEs kmem_cache */
 110 struct kmem_cache *lnet_small_mds_cachep;  /* <= LNET_SMALL_MD_SIZE bytes
 111                                             *  MDs kmem_cache */
 112
 113 static int
 114 lnet_descriptor_setup(void)
 115 {
 116         /* create specific kmem_cache for MEs and small MDs (i.e., originally
 117          * allocated in <size-xxx> kmem_cache).
 118          */
 119         lnet_mes_cachep = kmem_cache_create("lnet_MEs", sizeof(lnet_me_t),
 120                                             0, 0, NULL);
 121         if (!lnet_mes_cachep)
 122                 return -ENOMEM;
 123
 124         lnet_small_mds_cachep = kmem_cache_create("lnet_small_MDs",
 125                                                   LNET_SMALL_MD_SIZE, 0, 0,
 126                                                   NULL);
 127         if (!lnet_small_mds_cachep)
 128                 return -ENOMEM;
 129
 130         return 0;
 131 }
 132
 133 static void
 134 lnet_descriptor_cleanup(void)
 135 {
 136
 137         if (lnet_small_mds_cachep) {
 138                 kmem_cache_destroy(lnet_small_mds_cachep);
 139                 lnet_small_mds_cachep = NULL;
 140         }
 141
 142         if (lnet_mes_cachep) {
 143                 kmem_cache_destroy(lnet_mes_cachep);
 144                 lnet_mes_cachep = NULL;
 145         }
 146 }
 147
 148 static int
 149 lnet_create_remote_nets_table(void)
 150 {
 151         int               i;
 152         struct list_head *hash;
 153
 154         LASSERT(the_lnet.ln_remote_nets_hash == NULL);
 155         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 156         LIBCFS_ALLOC(hash, LNET_REMOTE_NETS_HASH_SIZE * sizeof(*hash));
 157         if (hash == NULL) {
 158                 CERROR("Failed to create remote nets hash table\n");
 159                 return -ENOMEM;
 160         }
 161
 162         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 163                 INIT_LIST_HEAD(&hash[i]);
 164         the_lnet.ln_remote_nets_hash = hash;
 165         return 0;
 166 }
 167
 168 static void
 169 lnet_destroy_remote_nets_table(void)
 170 {
 171         int i;
 172
 173         if (the_lnet.ln_remote_nets_hash == NULL)
 174                 return;
 175
 176         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 177                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 178
 179         LIBCFS_FREE(the_lnet.ln_remote_nets_hash,
 180                     LNET_REMOTE_NETS_HASH_SIZE *
 181                     sizeof(the_lnet.ln_remote_nets_hash[0]));
 182         the_lnet.ln_remote_nets_hash = NULL;
 183 }
 184
 185 static void
 186 lnet_destroy_locks(void)
 187 {
 188         if (the_lnet.ln_res_lock != NULL) {
 189                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 190                 the_lnet.ln_res_lock = NULL;
 191         }
 192
 193         if (the_lnet.ln_net_lock != NULL) {
 194                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 195                 the_lnet.ln_net_lock = NULL;
 196         }
 197
 198         lnet_fini_locks();
 199 }
 200
 201 static int
 202 lnet_create_locks(void)
 203 {
 204         lnet_init_locks();
 205
 206         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 207         if (the_lnet.ln_res_lock == NULL)
 208                 goto failed;
 209
 210         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 211         if (the_lnet.ln_net_lock == NULL)
 212                 goto failed;
 213
 214         return 0;
 215
 216  failed:
 217         lnet_destroy_locks();
 218         return -ENOMEM;
 219 }
 220
 221 static void lnet_assert_wire_constants(void)
 222 {
 223         /* Wire protocol assertions generated by 'wirecheck'
 224          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 225          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 226          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
 227
 228         /* Constants... */
 229         CLASSERT (LNET_PROTO_TCP_MAGIC == 0xeebc0ded);
 230         CLASSERT (LNET_PROTO_TCP_VERSION_MAJOR == 1);
 231         CLASSERT (LNET_PROTO_TCP_VERSION_MINOR == 0);
 232         CLASSERT (LNET_MSG_ACK == 0);
 233         CLASSERT (LNET_MSG_PUT == 1);
 234         CLASSERT (LNET_MSG_GET == 2);
 235         CLASSERT (LNET_MSG_REPLY == 3);
 236         CLASSERT (LNET_MSG_HELLO == 4);
 237
 238         /* Checks for struct ptl_handle_wire_t */
 239         CLASSERT ((int)sizeof(lnet_handle_wire_t) == 16);
 240         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_interface_cookie) == 0);
 241         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_interface_cookie) == 8);
 242         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_object_cookie) == 8);
 243         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_object_cookie) == 8);
 244
 245         /* Checks for struct lnet_magicversion_t */
 246         CLASSERT ((int)sizeof(lnet_magicversion_t) == 8);
 247         CLASSERT ((int)offsetof(lnet_magicversion_t, magic) == 0);
 248         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->magic) == 4);
 249         CLASSERT ((int)offsetof(lnet_magicversion_t, version_major) == 4);
 250         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_major) == 2);
 251         CLASSERT ((int)offsetof(lnet_magicversion_t, version_minor) == 6);
 252         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_minor) == 2);
 253
 254         /* Checks for struct lnet_hdr_t */
 255         CLASSERT ((int)sizeof(lnet_hdr_t) == 72);
 256         CLASSERT ((int)offsetof(lnet_hdr_t, dest_nid) == 0);
 257         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_nid) == 8);
 258         CLASSERT ((int)offsetof(lnet_hdr_t, src_nid) == 8);
 259         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_nid) == 8);
 260         CLASSERT ((int)offsetof(lnet_hdr_t, dest_pid) == 16);
 261         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_pid) == 4);
 262         CLASSERT ((int)offsetof(lnet_hdr_t, src_pid) == 20);
 263         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_pid) == 4);
 264         CLASSERT ((int)offsetof(lnet_hdr_t, type) == 24);
 265         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->type) == 4);
 266         CLASSERT ((int)offsetof(lnet_hdr_t, payload_length) == 28);
 267         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->payload_length) == 4);
 268         CLASSERT ((int)offsetof(lnet_hdr_t, msg) == 32);
 269         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg) == 40);
 270
 271         /* Ack */
 272         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.dst_wmd) == 32);
 273         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.dst_wmd) == 16);
 274         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.match_bits) == 48);
 275         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.match_bits) == 8);
 276         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.mlength) == 56);
 277         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.mlength) == 4);
 278
 279         /* Put */
 280         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ack_wmd) == 32);
 281         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ack_wmd) == 16);
 282         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.match_bits) == 48);
 283         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.match_bits) == 8);
 284         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.hdr_data) == 56);
 285         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.hdr_data) == 8);
 286         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ptl_index) == 64);
 287         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ptl_index) == 4);
 288         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.offset) == 68);
 289         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.offset) == 4);
 290
 291         /* Get */
 292         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.return_wmd) == 32);
 293         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.return_wmd) == 16);
 294         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.match_bits) == 48);
 295         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.match_bits) == 8);
 296         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.ptl_index) == 56);
 297         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.ptl_index) == 4);
 298         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.src_offset) == 60);
 299         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.src_offset) == 4);
 300         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.sink_length) == 64);
 301         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.sink_length) == 4);
 302
 303         /* Reply */
 304         CLASSERT ((int)offsetof(lnet_hdr_t, msg.reply.dst_wmd) == 32);
 305         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.reply.dst_wmd) == 16);
 306
 307         /* Hello */
 308         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.incarnation) == 32);
 309         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.incarnation) == 8);
 310         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.type) == 40);
 311         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.type) == 4);
 312 }
 313
 314 static lnd_t *lnet_find_lnd_by_type(__u32 type)
 315 {
 316         lnd_t            *lnd;
 317         struct list_head *tmp;
 318
 319         /* holding lnd mutex */
 320         list_for_each(tmp, &the_lnet.ln_lnds) {
 321                 lnd = list_entry(tmp, lnd_t, lnd_list);
 322
 323                 if (lnd->lnd_type == type)
 324                         return lnd;
 325         }
 326         return NULL;
 327 }
 328
 329 void
 330 lnet_register_lnd (lnd_t *lnd)
 331 {
 332         mutex_lock(&the_lnet.ln_lnd_mutex);
 333
 334         LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
 335         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 336
 337         list_add_tail(&lnd->lnd_list, &the_lnet.ln_lnds);
 338         lnd->lnd_refcount = 0;
 339
 340         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 341
 342         mutex_unlock(&the_lnet.ln_lnd_mutex);
 343 }
 344 EXPORT_SYMBOL(lnet_register_lnd);
 345
 346 void
 347 lnet_unregister_lnd (lnd_t *lnd)
 348 {
 349         mutex_lock(&the_lnet.ln_lnd_mutex);
 350
 351         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 352         LASSERT(lnd->lnd_refcount == 0);
 353
 354         list_del(&lnd->lnd_list);
 355         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 356
 357         mutex_unlock(&the_lnet.ln_lnd_mutex);
 358 }
 359 EXPORT_SYMBOL(lnet_unregister_lnd);
 360
 361 void
 362 lnet_counters_get(lnet_counters_t *counters)
 363 {
 364         lnet_counters_t *ctr;
 365         int             i;
 366
 367         memset(counters, 0, sizeof(*counters));
 368
 369         lnet_net_lock(LNET_LOCK_EX);
 370
 371         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 372                 counters->msgs_max     += ctr->msgs_max;
 373                 counters->msgs_alloc   += ctr->msgs_alloc;
 374                 counters->errors       += ctr->errors;
 375                 counters->send_count   += ctr->send_count;
 376                 counters->recv_count   += ctr->recv_count;
 377                 counters->route_count  += ctr->route_count;
 378                 counters->drop_count   += ctr->drop_count;
 379                 counters->send_length  += ctr->send_length;
 380                 counters->recv_length  += ctr->recv_length;
 381                 counters->route_length += ctr->route_length;
 382                 counters->drop_length  += ctr->drop_length;
 383
 384         }
 385         lnet_net_unlock(LNET_LOCK_EX);
 386 }
 387 EXPORT_SYMBOL(lnet_counters_get);
 388
 389 void
 390 lnet_counters_reset(void)
 391 {
 392         lnet_counters_t *counters;
 393         int             i;
 394
 395         lnet_net_lock(LNET_LOCK_EX);
 396
 397         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
 398                 memset(counters, 0, sizeof(lnet_counters_t));
 399
 400         lnet_net_unlock(LNET_LOCK_EX);
 401 }
 402
 403 static __u64 lnet_create_interface_cookie(void)
 404 {
 405         /* NB the interface cookie in wire handles guards against delayed
 406          * replies and ACKs appearing valid after reboot. Initialisation time,
 407          * even if it's only implemented to millisecond resolution is probably
 408          * easily good enough. */
 409         struct timeval tv;
 410         __u64          cookie;
 411         do_gettimeofday(&tv);
 412         cookie = tv.tv_sec;
 413         cookie *= 1000000;
 414         cookie += tv.tv_usec;
 415         return cookie;
 416 }
 417
 418 static char *
 419 lnet_res_type2str(int type)
 420 {
 421         switch (type) {
 422         default:
 423                 LBUG();
 424         case LNET_COOKIE_TYPE_MD:
 425                 return "MD";
 426         case LNET_COOKIE_TYPE_ME:
 427                 return "ME";
 428         case LNET_COOKIE_TYPE_EQ:
 429                 return "EQ";
 430         }
 431 }
 432
 433 static void
 434 lnet_res_container_cleanup(struct lnet_res_container *rec)
 435 {
 436         int     count = 0;
 437
 438         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
 439                 return;
 440
 441         while (!list_empty(&rec->rec_active)) {
 442                 struct list_head *e = rec->rec_active.next;
 443
 444                 list_del_init(e);
 445                 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
 446                         lnet_eq_free(list_entry(e, lnet_eq_t, eq_list));
 447
 448                 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
 449                         lnet_md_free(list_entry(e, lnet_libmd_t, md_list));
 450
 451                 } else { /* NB: Active MEs should be attached on portals */
 452                         LBUG();
 453                 }
 454                 count++;
 455         }
 456
 457         if (count > 0) {
 458                 /* Found alive MD/ME/EQ, user really should unlink/free
 459                  * all of them before finalize LNet, but if someone didn't,
 460                  * we have to recycle garbage for him */
 461                 CERROR("%d active elements on exit of %s container\n",
 462                        count, lnet_res_type2str(rec->rec_type));
 463         }
 464
 465         if (rec->rec_lh_hash != NULL) {
 466                 LIBCFS_FREE(rec->rec_lh_hash,
 467                             LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 468                 rec->rec_lh_hash = NULL;
 469         }
 470
 471         rec->rec_type = 0; /* mark it as finalized */
 472 }
 473
 474 static int
 475 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
 476 {
 477         int     rc = 0;
 478         int     i;
 479
 480         LASSERT(rec->rec_type == 0);
 481
 482         rec->rec_type = type;
 483         INIT_LIST_HEAD(&rec->rec_active);
 484
 485         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
 486
 487         /* Arbitrary choice of hash table size */
 488         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
 489                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 490         if (rec->rec_lh_hash == NULL) {
 491                 rc = -ENOMEM;
 492                 goto out;
 493         }
 494
 495         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
 496                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
 497
 498         return 0;
 499
 500 out:
 501         CERROR("Failed to setup %s resource container\n",
 502                lnet_res_type2str(type));
 503         lnet_res_container_cleanup(rec);
 504         return rc;
 505 }
 506
 507 static void
 508 lnet_res_containers_destroy(struct lnet_res_container **recs)
 509 {
 510         struct lnet_res_container       *rec;
 511         int                             i;
 512
 513         cfs_percpt_for_each(rec, i, recs)
 514                 lnet_res_container_cleanup(rec);
 515
 516         cfs_percpt_free(recs);
 517 }
 518
 519 static struct lnet_res_container **
 520 lnet_res_containers_create(int type)
 521 {
 522         struct lnet_res_container       **recs;
 523         struct lnet_res_container       *rec;
 524         int                             rc;
 525         int                             i;
 526
 527         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
 528         if (recs == NULL) {
 529                 CERROR("Failed to allocate %s resource containers\n",
 530                        lnet_res_type2str(type));
 531                 return NULL;
 532         }
 533
 534         cfs_percpt_for_each(rec, i, recs) {
 535                 rc = lnet_res_container_setup(rec, i, type);
 536                 if (rc != 0) {
 537                         lnet_res_containers_destroy(recs);
 538                         return NULL;
 539                 }
 540         }
 541
 542         return recs;
 543 }
 544
 545 lnet_libhandle_t *
 546 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
 547 {
 548         /* ALWAYS called with lnet_res_lock held */
 549         struct list_head        *head;
 550         lnet_libhandle_t        *lh;
 551         unsigned int            hash;
 552
 553         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
 554                 return NULL;
 555
 556         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
 557         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
 558
 559         list_for_each_entry(lh, head, lh_hash_chain) {
 560                 if (lh->lh_cookie == cookie)
 561                         return lh;
 562         }
 563
 564         return NULL;
 565 }
 566
 567 void
 568 lnet_res_lh_initialize(struct lnet_res_container *rec, lnet_libhandle_t *lh)
 569 {
 570         /* ALWAYS called with lnet_res_lock held */
 571         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
 572         unsigned int    hash;
 573
 574         lh->lh_cookie = rec->rec_lh_cookie;
 575         rec->rec_lh_cookie += 1 << ibits;
 576
 577         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
 578
 579         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
 580 }
 581
 582 static int lnet_unprepare(void);
 583
 584 static int
 585 lnet_prepare(lnet_pid_t requested_pid)
 586 {
 587         /* Prepare to bring up the network */
 588         struct lnet_res_container **recs;
 589         int                       rc = 0;
 590
 591         if (requested_pid == LNET_PID_ANY) {
 592                 /* Don't instantiate LNET just for me */
 593                 return -ENETDOWN;
 594         }
 595
 596         LASSERT(the_lnet.ln_refcount == 0);
 597
 598         the_lnet.ln_routing = 0;
 599
 600         LASSERT((requested_pid & LNET_PID_USERFLAG) == 0);
 601         the_lnet.ln_pid = requested_pid;
 602
 603         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
 604         INIT_LIST_HEAD(&the_lnet.ln_nis);
 605         INIT_LIST_HEAD(&the_lnet.ln_nis_cpt);
 606         INIT_LIST_HEAD(&the_lnet.ln_nis_zombie);
 607         INIT_LIST_HEAD(&the_lnet.ln_routers);
 608         INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
 609         INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
 610
 611         rc = lnet_descriptor_setup();
 612         if (rc != 0)
 613                 goto failed;
 614
 615         rc = lnet_create_remote_nets_table();
 616         if (rc != 0)
 617                 goto failed;
 618
 619         the_lnet.ln_interface_cookie = lnet_create_interface_cookie();
 620
 621         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
 622                                                 sizeof(lnet_counters_t));
 623         if (the_lnet.ln_counters == NULL) {
 624                 CERROR("Failed to allocate counters for LNet\n");
 625                 rc = -ENOMEM;
 626                 goto failed;
 627         }
 628
 629         rc = lnet_peer_tables_create();
 630         if (rc != 0)
 631                 goto failed;
 632
 633         rc = lnet_msg_containers_create();
 634         if (rc != 0)
 635                 goto failed;
 636
 637         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
 638                                       LNET_COOKIE_TYPE_EQ);
 639         if (rc != 0)
 640                 goto failed;
 641
 642         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME);
 643         if (recs == NULL) {
 644                 rc = -ENOMEM;
 645                 goto failed;
 646         }
 647
 648         the_lnet.ln_me_containers = recs;
 649
 650         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
 651         if (recs == NULL) {
 652                 rc = -ENOMEM;
 653                 goto failed;
 654         }
 655
 656         the_lnet.ln_md_containers = recs;
 657
 658         rc = lnet_portals_create();
 659         if (rc != 0) {
 660                 CERROR("Failed to create portals for LNet: %d\n", rc);
 661                 goto failed;
 662         }
 663
 664         return 0;
 665
 666  failed:
 667         lnet_unprepare();
 668         return rc;
 669 }
 670
 671 static int
 672 lnet_unprepare (void)
 673 {
 674         /* NB no LNET_LOCK since this is the last reference.  All LND instances
 675          * have shut down already, so it is safe to unlink and free all
 676          * descriptors, even those that appear committed to a network op (eg MD
 677          * with non-zero pending count) */
 678
 679         lnet_fail_nid(LNET_NID_ANY, 0);
 680
 681         LASSERT(the_lnet.ln_refcount == 0);
 682         LASSERT(list_empty(&the_lnet.ln_test_peers));
 683         LASSERT(list_empty(&the_lnet.ln_nis));
 684         LASSERT(list_empty(&the_lnet.ln_nis_cpt));
 685         LASSERT(list_empty(&the_lnet.ln_nis_zombie));
 686
 687         lnet_portals_destroy();
 688
 689         if (the_lnet.ln_md_containers != NULL) {
 690                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
 691                 the_lnet.ln_md_containers = NULL;
 692         }
 693
 694         if (the_lnet.ln_me_containers != NULL) {
 695                 lnet_res_containers_destroy(the_lnet.ln_me_containers);
 696                 the_lnet.ln_me_containers = NULL;
 697         }
 698
 699         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
 700
 701         lnet_msg_containers_destroy();
 702         lnet_peer_tables_destroy();
 703         lnet_rtrpools_free(0);
 704
 705         if (the_lnet.ln_counters != NULL) {
 706                 cfs_percpt_free(the_lnet.ln_counters);
 707                 the_lnet.ln_counters = NULL;
 708         }
 709         lnet_destroy_remote_nets_table();
 710         lnet_descriptor_cleanup();
 711
 712         return 0;
 713 }
 714
 715 lnet_ni_t  *
 716 lnet_net2ni_locked(__u32 net, int cpt)
 717 {
 718         struct list_head *tmp;
 719         lnet_ni_t        *ni;
 720
 721         LASSERT(cpt != LNET_LOCK_EX);
 722
 723         list_for_each(tmp, &the_lnet.ln_nis) {
 724                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 725
 726                 if (LNET_NIDNET(ni->ni_nid) == net) {
 727                         lnet_ni_addref_locked(ni, cpt);
 728                         return ni;
 729                 }
 730         }
 731
 732         return NULL;
 733 }
 734
 735 lnet_ni_t *
 736 lnet_net2ni(__u32 net)
 737 {
 738         lnet_ni_t *ni;
 739
 740         lnet_net_lock(0);
 741         ni = lnet_net2ni_locked(net, 0);
 742         lnet_net_unlock(0);
 743
 744         return ni;
 745 }
 746 EXPORT_SYMBOL(lnet_net2ni);
 747
 748 static unsigned int
 749 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
 750 {
 751         __u64           key = nid;
 752         unsigned int    val;
 753
 754         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
 755
 756         if (number == 1)
 757                 return 0;
 758
 759         val = hash_long(key, LNET_CPT_BITS);
 760         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
 761         if (val < number)
 762                 return val;
 763
 764         return (unsigned int)(key + val + (val >> 1)) % number;
 765 }
 766
 767 int
 768 lnet_cpt_of_nid_locked(lnet_nid_t nid)
 769 {
 770         struct lnet_ni *ni;
 771
 772         /* must called with hold of lnet_net_lock */
 773         if (LNET_CPT_NUMBER == 1)
 774                 return 0; /* the only one */
 775
 776         /* take lnet_net_lock(any) would be OK */
 777         if (!list_empty(&the_lnet.ln_nis_cpt)) {
 778                 list_for_each_entry(ni, &the_lnet.ln_nis_cpt, ni_cptlist) {
 779                         if (LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid))
 780                                 continue;
 781
 782                         LASSERT(ni->ni_cpts != NULL);
 783                         return ni->ni_cpts[lnet_nid_cpt_hash
 784                                            (nid, ni->ni_ncpts)];
 785                 }
 786         }
 787
 788         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 789 }
 790
 791 int
 792 lnet_cpt_of_nid(lnet_nid_t nid)
 793 {
 794         int     cpt;
 795         int     cpt2;
 796
 797         if (LNET_CPT_NUMBER == 1)
 798                 return 0; /* the only one */
 799
 800         if (list_empty(&the_lnet.ln_nis_cpt))
 801                 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 802
 803         cpt = lnet_net_lock_current();
 804         cpt2 = lnet_cpt_of_nid_locked(nid);
 805         lnet_net_unlock(cpt);
 806
 807         return cpt2;
 808 }
 809 EXPORT_SYMBOL(lnet_cpt_of_nid);
 810
 811 int
 812 lnet_islocalnet(__u32 net)
 813 {
 814         struct lnet_ni  *ni;
 815         int             cpt;
 816
 817         cpt = lnet_net_lock_current();
 818
 819         ni = lnet_net2ni_locked(net, cpt);
 820         if (ni != NULL)
 821                 lnet_ni_decref_locked(ni, cpt);
 822
 823         lnet_net_unlock(cpt);
 824
 825         return ni != NULL;
 826 }
 827
 828 lnet_ni_t  *
 829 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
 830 {
 831         struct lnet_ni   *ni;
 832         struct list_head *tmp;
 833
 834         LASSERT(cpt != LNET_LOCK_EX);
 835
 836         list_for_each(tmp, &the_lnet.ln_nis) {
 837                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 838
 839                 if (ni->ni_nid == nid) {
 840                         lnet_ni_addref_locked(ni, cpt);
 841                         return ni;
 842                 }
 843         }
 844
 845         return NULL;
 846 }
 847
 848 int
 849 lnet_islocalnid(lnet_nid_t nid)
 850 {
 851         struct lnet_ni  *ni;
 852         int             cpt;
 853
 854         cpt = lnet_net_lock_current();
 855         ni = lnet_nid2ni_locked(nid, cpt);
 856         if (ni != NULL)
 857                 lnet_ni_decref_locked(ni, cpt);
 858         lnet_net_unlock(cpt);
 859
 860         return ni != NULL;
 861 }
 862
 863 int
 864 lnet_count_acceptor_nis (void)
 865 {
 866         /* Return the # of NIs that need the acceptor. */
 867         int              count = 0;
 868         struct list_head *tmp;
 869         struct lnet_ni   *ni;
 870         int              cpt;
 871
 872         cpt = lnet_net_lock_current();
 873         list_for_each(tmp, &the_lnet.ln_nis) {
 874                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 875
 876                 if (ni->ni_lnd->lnd_accept != NULL)
 877                         count++;
 878         }
 879
 880         lnet_net_unlock(cpt);
 881
 882         return count;
 883 }
 884
 885 static lnet_ping_info_t *
 886 lnet_ping_info_create(int num_ni)
 887 {
 888         lnet_ping_info_t *ping_info;
 889         unsigned int     infosz;
 890
 891         infosz = offsetof(lnet_ping_info_t, pi_ni[num_ni]);
 892         LIBCFS_ALLOC(ping_info, infosz);
 893         if (ping_info == NULL) {
 894                 CERROR("Can't allocate ping info[%d]\n", num_ni);
 895                 return NULL;
 896         }
 897
 898         ping_info->pi_nnis = num_ni;
 899         ping_info->pi_pid = the_lnet.ln_pid;
 900         ping_info->pi_magic = LNET_PROTO_PING_MAGIC;
 901         ping_info->pi_features = LNET_PING_FEAT_NI_STATUS;
 902
 903         return ping_info;
 904 }
 905
 906 static inline int
 907 lnet_get_ni_count(void)
 908 {
 909         struct lnet_ni *ni;
 910         int            count = 0;
 911
 912         lnet_net_lock(0);
 913
 914         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list)
 915                 count++;
 916
 917         lnet_net_unlock(0);
 918
 919         return count;
 920 }
 921
 922 static inline void
 923 lnet_ping_info_free(lnet_ping_info_t *pinfo)
 924 {
 925         LIBCFS_FREE(pinfo,
 926                     offsetof(lnet_ping_info_t,
 927                              pi_ni[pinfo->pi_nnis]));
 928 }
 929
 930 static void
 931 lnet_ping_info_destroy(void)
 932 {
 933         struct lnet_ni  *ni;
 934
 935         lnet_net_lock(LNET_LOCK_EX);
 936
 937         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
 938                 lnet_ni_lock(ni);
 939                 ni->ni_status = NULL;
 940                 lnet_ni_unlock(ni);
 941         }
 942
 943         lnet_ping_info_free(the_lnet.ln_ping_info);
 944         the_lnet.ln_ping_info = NULL;
 945
 946         lnet_net_unlock(LNET_LOCK_EX);
 947 }
 948
 949 static void
 950 lnet_ping_event_handler(lnet_event_t *event)
 951 {
 952         lnet_ping_info_t *pinfo = event->md.user_ptr;
 953
 954         if (event->unlinked)
 955                 pinfo->pi_features = LNET_PING_FEAT_INVAL;
 956 }
 957
 958 static int
 959 lnet_ping_info_setup(lnet_ping_info_t **ppinfo, lnet_handle_md_t *md_handle,
 960                      int ni_count, bool set_eq)
 961 {
 962         lnet_handle_me_t  me_handle;
 963         lnet_process_id_t id = {LNET_NID_ANY, LNET_PID_ANY};
 964         lnet_md_t         md = {NULL};
 965         int               rc, rc2;
 966
 967         if (set_eq) {
 968                 rc = LNetEQAlloc(0, lnet_ping_event_handler,
 969                                  &the_lnet.ln_ping_target_eq);
 970                 if (rc != 0) {
 971                         CERROR("Can't allocate ping EQ: %d\n", rc);
 972                         return rc;
 973                 }
 974         }
 975
 976         *ppinfo = lnet_ping_info_create(ni_count);
 977         if (*ppinfo == NULL) {
 978                 rc = -ENOMEM;
 979                 goto failed_0;
 980         }
 981
 982         rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
 983                           LNET_PROTO_PING_MATCHBITS, 0,
 984                           LNET_UNLINK, LNET_INS_AFTER,
 985                           &me_handle);
 986         if (rc != 0) {
 987                 CERROR("Can't create ping ME: %d\n", rc);
 988                 goto failed_1;
 989         }
 990
 991         /* initialize md content */
 992         md.start     = *ppinfo;
 993         md.length    = offsetof(lnet_ping_info_t,
 994                                 pi_ni[(*ppinfo)->pi_nnis]);
 995         md.threshold = LNET_MD_THRESH_INF;
 996         md.max_size  = 0;
 997         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
 998                        LNET_MD_MANAGE_REMOTE;
 999         md.user_ptr  = NULL;
1000         md.eq_handle = the_lnet.ln_ping_target_eq;
1001         md.user_ptr = *ppinfo;
1002
1003         rc = LNetMDAttach(me_handle, md, LNET_RETAIN, md_handle);
1004         if (rc != 0) {
1005                 CERROR("Can't attach ping MD: %d\n", rc);
1006                 goto failed_2;
1007         }
1008
1009         return 0;
1010
1011 failed_2:
1012         rc2 = LNetMEUnlink(me_handle);
1013         LASSERT(rc2 == 0);
1014 failed_1:
1015         lnet_ping_info_free(*ppinfo);
1016         *ppinfo = NULL;
1017 failed_0:
1018         if (set_eq)
1019                 LNetEQFree(the_lnet.ln_ping_target_eq);
1020         return rc;
1021 }
1022
1023 static void
1024 lnet_ping_md_unlink(lnet_ping_info_t *pinfo, lnet_handle_md_t *md_handle)
1025 {
1026         sigset_t        blocked = cfs_block_allsigs();
1027
1028         LNetMDUnlink(*md_handle);
1029         LNetInvalidateHandle(md_handle);
1030
1031         /* NB md could be busy; this just starts the unlink */
1032         while (pinfo->pi_features != LNET_PING_FEAT_INVAL) {
1033                 CDEBUG(D_NET, "Still waiting for ping MD to unlink\n");
1034                 set_current_state(TASK_UNINTERRUPTIBLE);
1035                 schedule_timeout(cfs_time_seconds(1));
1036         }
1037
1038         cfs_restore_sigs(blocked);
1039 }
1040
1041 static void
1042 lnet_ping_info_install_locked(lnet_ping_info_t *ping_info)
1043 {
1044         int                     i;
1045         lnet_ni_t               *ni;
1046         lnet_ni_status_t        *ns;
1047
1048         i = 0;
1049         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
1050                 LASSERT(i < ping_info->pi_nnis);
1051
1052                 ns = &ping_info->pi_ni[i];
1053
1054                 ns->ns_nid = ni->ni_nid;
1055
1056                 lnet_ni_lock(ni);
1057                 ns->ns_status = (ni->ni_status != NULL) ?
1058                                 ni->ni_status->ns_status : LNET_NI_STATUS_UP;
1059                 ni->ni_status = ns;
1060                 lnet_ni_unlock(ni);
1061
1062                 i++;
1063         }
1064 }
1065
1066 static void
1067 lnet_ping_target_update(lnet_ping_info_t *pinfo, lnet_handle_md_t md_handle)
1068 {
1069         lnet_ping_info_t *old_pinfo = NULL;
1070         lnet_handle_md_t old_md;
1071
1072         /* switch the NIs to point to the new ping info created */
1073         lnet_net_lock(LNET_LOCK_EX);
1074
1075         if (!the_lnet.ln_routing)
1076                 pinfo->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1077         lnet_ping_info_install_locked(pinfo);
1078
1079         if (the_lnet.ln_ping_info != NULL) {
1080                 old_pinfo = the_lnet.ln_ping_info;
1081                 old_md = the_lnet.ln_ping_target_md;
1082         }
1083         the_lnet.ln_ping_target_md = md_handle;
1084         the_lnet.ln_ping_info = pinfo;
1085
1086         lnet_net_unlock(LNET_LOCK_EX);
1087
1088         if (old_pinfo != NULL) {
1089                 /* unlink the old ping info */
1090                 lnet_ping_md_unlink(old_pinfo, &old_md);
1091                 lnet_ping_info_free(old_pinfo);
1092         }
1093 }
1094
1095 static void
1096 lnet_ping_target_fini(void)
1097 {
1098         int             rc;
1099
1100         lnet_ping_md_unlink(the_lnet.ln_ping_info,
1101                             &the_lnet.ln_ping_target_md);
1102
1103         rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1104         LASSERT(rc == 0);
1105
1106         lnet_ping_info_destroy();
1107 }
1108
1109 static int
1110 lnet_ni_tq_credits(lnet_ni_t *ni)
1111 {
1112         int     credits;
1113
1114         LASSERT(ni->ni_ncpts >= 1);
1115
1116         if (ni->ni_ncpts == 1)
1117                 return ni->ni_maxtxcredits;
1118
1119         credits = ni->ni_maxtxcredits / ni->ni_ncpts;
1120         credits = max(credits, 8 * ni->ni_peertxcredits);
1121         credits = min(credits, ni->ni_maxtxcredits);
1122
1123         return credits;
1124 }
1125
1126 static void
1127 lnet_ni_unlink_locked(lnet_ni_t *ni)
1128 {
1129         if (!list_empty(&ni->ni_cptlist)) {
1130                 list_del_init(&ni->ni_cptlist);
1131                 lnet_ni_decref_locked(ni, 0);
1132         }
1133
1134         /* move it to zombie list and nobody can find it anymore */
1135         LASSERT(!list_empty(&ni->ni_list));
1136         list_move(&ni->ni_list, &the_lnet.ln_nis_zombie);
1137         lnet_ni_decref_locked(ni, 0);   /* drop ln_nis' ref */
1138 }
1139
1140 static void
1141 lnet_clear_zombies_nis_locked(void)
1142 {
1143         int             i;
1144         int             islo;
1145         lnet_ni_t       *ni;
1146
1147         /* Now wait for the NI's I just nuked to show up on ln_zombie_nis
1148          * and shut them down in guaranteed thread context */
1149         i = 2;
1150         while (!list_empty(&the_lnet.ln_nis_zombie)) {
1151                 int     *ref;
1152                 int     j;
1153
1154                 ni = list_entry(the_lnet.ln_nis_zombie.next,
1155                                 lnet_ni_t, ni_list);
1156                 list_del_init(&ni->ni_list);
1157                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
1158                         if (*ref == 0)
1159                                 continue;
1160                         /* still busy, add it back to zombie list */
1161                         list_add(&ni->ni_list, &the_lnet.ln_nis_zombie);
1162                         break;
1163                 }
1164
1165                 if (!list_empty(&ni->ni_list)) {
1166                         lnet_net_unlock(LNET_LOCK_EX);
1167                         ++i;
1168                         if ((i & (-i)) == i) {
1169                                 CDEBUG(D_WARNING,
1170                                        "Waiting for zombie LNI %s\n",
1171                                        libcfs_nid2str(ni->ni_nid));
1172                         }
1173                         set_current_state(TASK_UNINTERRUPTIBLE);
1174                         schedule_timeout(cfs_time_seconds(1));
1175                         lnet_net_lock(LNET_LOCK_EX);
1176                         continue;
1177                 }
1178
1179                 ni->ni_lnd->lnd_refcount--;
1180                 lnet_net_unlock(LNET_LOCK_EX);
1181
1182                 islo = ni->ni_lnd->lnd_type == LOLND;
1183
1184                 LASSERT(!in_interrupt());
1185                 (ni->ni_lnd->lnd_shutdown)(ni);
1186
1187                 /* can't deref lnd anymore now; it might have unregistered
1188                  * itself...  */
1189
1190                 if (!islo)
1191                         CDEBUG(D_LNI, "Removed LNI %s\n",
1192                               libcfs_nid2str(ni->ni_nid));
1193
1194                 lnet_ni_free(ni);
1195                 i = 2;
1196                 lnet_net_lock(LNET_LOCK_EX);
1197         }
1198 }
1199
1200 static void
1201 lnet_shutdown_lndnis(void)
1202 {
1203         int             i;
1204         lnet_ni_t       *ni;
1205
1206         /* NB called holding the global mutex */
1207
1208         /* All quiet on the API front */
1209         LASSERT(!the_lnet.ln_shutdown);
1210         LASSERT(the_lnet.ln_refcount == 0);
1211         LASSERT(list_empty(&the_lnet.ln_nis_zombie));
1212
1213         lnet_net_lock(LNET_LOCK_EX);
1214         the_lnet.ln_shutdown = 1;       /* flag shutdown */
1215
1216         /* Unlink NIs from the global table */
1217         while (!list_empty(&the_lnet.ln_nis)) {
1218                 ni = list_entry(the_lnet.ln_nis.next,
1219                                 lnet_ni_t, ni_list);
1220                 lnet_ni_unlink_locked(ni);
1221         }
1222
1223         /* Drop the cached loopback NI. */
1224         if (the_lnet.ln_loni != NULL) {
1225                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
1226                 the_lnet.ln_loni = NULL;
1227         }
1228
1229         lnet_net_unlock(LNET_LOCK_EX);
1230
1231         /* Clear lazy portals and drop delayed messages which hold refs
1232          * on their lnet_msg_t::msg_rxpeer */
1233         for (i = 0; i < the_lnet.ln_nportals; i++)
1234                 LNetClearLazyPortal(i);
1235
1236         /* Clear the peer table and wait for all peers to go (they hold refs on
1237          * their NIs) */
1238         lnet_peer_tables_cleanup(NULL);
1239
1240         lnet_net_lock(LNET_LOCK_EX);
1241
1242         lnet_clear_zombies_nis_locked();
1243         the_lnet.ln_shutdown = 0;
1244         lnet_net_unlock(LNET_LOCK_EX);
1245 }
1246
1247 /* shutdown down the NI and release refcount */
1248 static void
1249 lnet_shutdown_lndni(struct lnet_ni *ni)
1250 {
1251         int i;
1252
1253         lnet_net_lock(LNET_LOCK_EX);
1254         lnet_ni_unlink_locked(ni);
1255         lnet_net_unlock(LNET_LOCK_EX);
1256
1257         /* clear messages for this NI on the lazy portal */
1258         for (i = 0; i < the_lnet.ln_nportals; i++)
1259                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
1260
1261         /* Do peer table cleanup for this ni */
1262         lnet_peer_tables_cleanup(ni);
1263
1264         lnet_net_lock(LNET_LOCK_EX);
1265         lnet_clear_zombies_nis_locked();
1266         lnet_net_unlock(LNET_LOCK_EX);
1267 }
1268
1269 static int
1270 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_ioctl_config_data *conf)
1271 {
1272         struct lnet_ioctl_config_lnd_tunables *lnd_tunables = NULL;
1273         int                     rc = -EINVAL;
1274         __u32                   lnd_type;
1275         lnd_t                   *lnd;
1276         struct lnet_tx_queue    *tq;
1277         int                     i;
1278
1279         lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
1280
1281         LASSERT(libcfs_isknown_lnd(lnd_type));
1282
1283         if (lnd_type == CIBLND || lnd_type == OPENIBLND ||
1284             lnd_type == IIBLND || lnd_type == VIBLND) {
1285                 CERROR("LND %s obsoleted\n", libcfs_lnd2str(lnd_type));
1286                 goto failed0;
1287         }
1288
1289         /* Make sure this new NI is unique. */
1290         lnet_net_lock(LNET_LOCK_EX);
1291         rc = lnet_net_unique(LNET_NIDNET(ni->ni_nid), &the_lnet.ln_nis);
1292         lnet_net_unlock(LNET_LOCK_EX);
1293
1294         if (!rc) {
1295                 if (lnd_type == LOLND) {
1296                         lnet_ni_free(ni);
1297                         return 0;
1298                 }
1299
1300                 CERROR("Net %s is not unique\n",
1301                        libcfs_net2str(LNET_NIDNET(ni->ni_nid)));
1302
1303                 rc = -EEXIST;
1304                 goto failed0;
1305         }
1306
1307         mutex_lock(&the_lnet.ln_lnd_mutex);
1308         lnd = lnet_find_lnd_by_type(lnd_type);
1309
1310         if (lnd == NULL) {
1311                 mutex_unlock(&the_lnet.ln_lnd_mutex);
1312                 rc = request_module("%s", libcfs_lnd2modname(lnd_type));
1313                 mutex_lock(&the_lnet.ln_lnd_mutex);
1314
1315                 lnd = lnet_find_lnd_by_type(lnd_type);
1316                 if (lnd == NULL) {
1317                         mutex_unlock(&the_lnet.ln_lnd_mutex);
1318                         CERROR("Can't load LND %s, module %s, rc=%d\n",
1319                                libcfs_lnd2str(lnd_type),
1320                                libcfs_lnd2modname(lnd_type), rc);
1321 #ifndef HAVE_MODULE_LOADING_SUPPORT
1322                         LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
1323                                            "compiled with kernel module "
1324                                            "loading support.");
1325 #endif
1326                         rc = -EINVAL;
1327                         goto failed0;
1328                 }
1329         }
1330
1331         lnet_net_lock(LNET_LOCK_EX);
1332         lnd->lnd_refcount++;
1333         lnet_net_unlock(LNET_LOCK_EX);
1334
1335         ni->ni_lnd = lnd;
1336
1337         if (conf && conf->cfg_hdr.ioc_len > sizeof(*conf))
1338                 lnd_tunables = (struct lnet_ioctl_config_lnd_tunables *)conf->cfg_bulk;
1339
1340         if (lnd_tunables != NULL) {
1341                 LIBCFS_ALLOC(ni->ni_lnd_tunables,
1342                              sizeof(*ni->ni_lnd_tunables));
1343                 if (ni->ni_lnd_tunables == NULL) {
1344                         mutex_unlock(&the_lnet.ln_lnd_mutex);
1345                         rc = -ENOMEM;
1346                         goto failed0;
1347                 }
1348                 memcpy(ni->ni_lnd_tunables, lnd_tunables,
1349                        sizeof(*ni->ni_lnd_tunables));
1350         }
1351
1352         /* If given some LND tunable parameters, parse those now to
1353          * override the values in the NI structure. */
1354         if (conf) {
1355                 if (conf->cfg_config_u.cfg_net.net_peer_rtr_credits >= 0)
1356                         ni->ni_peerrtrcredits =
1357                                 conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
1358                 if (conf->cfg_config_u.cfg_net.net_peer_timeout >= 0)
1359                         ni->ni_peertimeout =
1360                                 conf->cfg_config_u.cfg_net.net_peer_timeout;
1361                 if (conf->cfg_config_u.cfg_net.net_peer_tx_credits >= 0)
1362                         ni->ni_peertxcredits =
1363                                 conf->cfg_config_u.cfg_net.net_peer_tx_credits;
1364                 if (conf->cfg_config_u.cfg_net.net_max_tx_credits >= 0)
1365                         ni->ni_maxtxcredits =
1366                                 conf->cfg_config_u.cfg_net.net_max_tx_credits;
1367         }
1368
1369         rc = (lnd->lnd_startup)(ni);
1370
1371         mutex_unlock(&the_lnet.ln_lnd_mutex);
1372
1373         if (rc != 0) {
1374                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
1375                                    rc, libcfs_lnd2str(lnd->lnd_type));
1376                 lnet_net_lock(LNET_LOCK_EX);
1377                 lnd->lnd_refcount--;
1378                 lnet_net_unlock(LNET_LOCK_EX);
1379                 goto failed0;
1380         }
1381
1382         LASSERT(ni->ni_peertimeout <= 0 || lnd->lnd_query != NULL);
1383
1384         lnet_net_lock(LNET_LOCK_EX);
1385         /* refcount for ln_nis */
1386         lnet_ni_addref_locked(ni, 0);
1387         list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1388         if (ni->ni_cpts != NULL) {
1389                 lnet_ni_addref_locked(ni, 0);
1390                 list_add_tail(&ni->ni_cptlist, &the_lnet.ln_nis_cpt);
1391         }
1392
1393         lnet_net_unlock(LNET_LOCK_EX);
1394
1395         if (lnd->lnd_type == LOLND) {
1396                 lnet_ni_addref(ni);
1397                 LASSERT(the_lnet.ln_loni == NULL);
1398                 the_lnet.ln_loni = ni;
1399                 return 0;
1400         }
1401
1402         if (ni->ni_peertxcredits == 0 || ni->ni_maxtxcredits == 0) {
1403                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1404                                    libcfs_lnd2str(lnd->lnd_type),
1405                                    ni->ni_peertxcredits == 0 ?
1406                                         "" : "per-peer ");
1407                 /* shutdown the NI since if we get here then it must've already
1408                  * been started
1409                  */
1410                 lnet_shutdown_lndni(ni);
1411                 return -EINVAL;
1412         }
1413
1414         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1415                 tq->tq_credits_min =
1416                 tq->tq_credits_max =
1417                 tq->tq_credits = lnet_ni_tq_credits(ni);
1418         }
1419
1420         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1421                 libcfs_nid2str(ni->ni_nid), ni->ni_peertxcredits,
1422                 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1423                 ni->ni_peerrtrcredits, ni->ni_peertimeout);
1424
1425         return 0;
1426 failed0:
1427         lnet_ni_free(ni);
1428         return rc;
1429 }
1430
1431 static int
1432 lnet_startup_lndnis(struct list_head *nilist)
1433 {
1434         struct lnet_ni          *ni;
1435         int                     rc;
1436         int                     ni_count = 0;
1437
1438         while (!list_empty(nilist)) {
1439                 ni = list_entry(nilist->next, lnet_ni_t, ni_list);
1440                 list_del(&ni->ni_list);
1441                 rc = lnet_startup_lndni(ni, NULL);
1442
1443                 if (rc < 0)
1444                         goto failed;
1445
1446                 ni_count++;
1447         }
1448
1449         return ni_count;
1450 failed:
1451         lnet_shutdown_lndnis();
1452
1453         return rc;
1454 }
1455
1456 /**
1457  * Initialize LNet library.
1458  *
1459  * Automatically called at module loading time. Caller has to call
1460  * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
1461  * latter returned 0. It must be called exactly once.
1462  *
1463  * \retval 0 on success
1464  * \retval -ve on failures.
1465  */
1466 int lnet_lib_init(void)
1467 {
1468         int rc;
1469
1470         lnet_assert_wire_constants();
1471
1472         memset(&the_lnet, 0, sizeof(the_lnet));
1473
1474         /* refer to global cfs_cpt_table for now */
1475         the_lnet.ln_cpt_table   = cfs_cpt_table;
1476         the_lnet.ln_cpt_number  = cfs_cpt_number(cfs_cpt_table);
1477
1478         LASSERT(the_lnet.ln_cpt_number > 0);
1479         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1480                 /* we are under risk of consuming all lh_cookie */
1481                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
1482                        "please change setting of CPT-table and retry\n",
1483                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
1484                 return -E2BIG;
1485         }
1486
1487         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1488                 the_lnet.ln_cpt_bits++;
1489
1490         rc = lnet_create_locks();
1491         if (rc != 0) {
1492                 CERROR("Can't create LNet global locks: %d\n", rc);
1493                 return rc;
1494         }
1495
1496         the_lnet.ln_refcount = 0;
1497         LNetInvalidateHandle(&the_lnet.ln_rc_eqh);
1498         INIT_LIST_HEAD(&the_lnet.ln_lnds);
1499         INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1500         INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1501
1502         /* The hash table size is the number of bits it takes to express the set
1503          * ln_num_routes, minus 1 (better to under estimate than over so we
1504          * don't waste memory). */
1505         if (rnet_htable_size <= 0)
1506                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
1507         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
1508                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
1509         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
1510                                            order_base_2(rnet_htable_size) - 1);
1511
1512         /* All LNDs apart from the LOLND are in separate modules.  They
1513          * register themselves when their module loads, and unregister
1514          * themselves when their module is unloaded. */
1515         lnet_register_lnd(&the_lolnd);
1516         return 0;
1517 }
1518
1519 /**
1520  * Finalize LNet library.
1521  *
1522  * \pre lnet_lib_init() called with success.
1523  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1524  */
1525 void lnet_lib_exit(void)
1526 {
1527         LASSERT(the_lnet.ln_refcount == 0);
1528
1529         while (!list_empty(&the_lnet.ln_lnds))
1530                 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1531                                                lnd_t, lnd_list));
1532         lnet_destroy_locks();
1533 }
1534
1535 /**
1536  * Set LNet PID and start LNet interfaces, routing, and forwarding.
1537  *
1538  * Users must call this function at least once before any other functions.
1539  * For each successful call there must be a corresponding call to
1540  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1541  * ignored.
1542  *
1543  * The PID used by LNet may be different from the one requested.
1544  * See LNetGetId().
1545  *
1546  * \param requested_pid PID requested by the caller.
1547  *
1548  * \return >= 0 on success, and < 0 error code on failures.
1549  */
1550 int
1551 LNetNIInit(lnet_pid_t requested_pid)
1552 {
1553         int                     im_a_router = 0;
1554         int                     rc;
1555         int                     ni_count;
1556         lnet_ping_info_t        *pinfo;
1557         lnet_handle_md_t        md_handle;
1558         struct list_head        net_head;
1559
1560         INIT_LIST_HEAD(&net_head);
1561
1562         mutex_lock(&the_lnet.ln_api_mutex);
1563
1564         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1565
1566         if (the_lnet.ln_refcount > 0) {
1567                 rc = the_lnet.ln_refcount++;
1568                 mutex_unlock(&the_lnet.ln_api_mutex);
1569                 return rc;
1570         }
1571
1572         rc = lnet_prepare(requested_pid);
1573         if (rc != 0) {
1574                 mutex_unlock(&the_lnet.ln_api_mutex);
1575                 return rc;
1576         }
1577
1578         /* Add in the loopback network */
1579         if (lnet_ni_alloc(LNET_MKNET(LOLND, 0), NULL, &net_head) == NULL) {
1580                 rc = -ENOMEM;
1581                 goto failed0;
1582         }
1583
1584         /* If LNet is being initialized via DLC it is possible
1585          * that the user requests not to load module parameters (ones which
1586          * are supported by DLC) on initialization.  Therefore, make sure not
1587          * to load networks, routes and forwarding from module parameters
1588          * in this case.  On cleanup in case of failure only clean up
1589          * routes if it has been loaded */
1590         if (!the_lnet.ln_nis_from_mod_params) {
1591                 rc = lnet_parse_networks(&net_head,
1592                                          lnet_get_networks());
1593                 if (rc < 0)
1594                         goto failed0;
1595         }
1596
1597         ni_count = lnet_startup_lndnis(&net_head);
1598         if (ni_count < 0) {
1599                 rc = ni_count;
1600                 goto failed0;
1601         }
1602
1603         if (!the_lnet.ln_nis_from_mod_params) {
1604                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1605                 if (rc != 0)
1606                         goto failed1;
1607
1608                 rc = lnet_check_routes();
1609                 if (rc != 0)
1610                         goto failed2;
1611
1612                 rc = lnet_rtrpools_alloc(im_a_router);
1613                 if (rc != 0)
1614                         goto failed2;
1615         }
1616
1617         rc = lnet_acceptor_start();
1618         if (rc != 0)
1619                 goto failed2;
1620         the_lnet.ln_refcount = 1;
1621         /* Now I may use my own API functions... */
1622
1623         rc = lnet_ping_info_setup(&pinfo, &md_handle, ni_count, true);
1624         if (rc != 0)
1625                 goto failed3;
1626
1627         lnet_ping_target_update(pinfo, md_handle);
1628
1629         rc = lnet_router_checker_start();
1630         if (rc != 0)
1631                 goto failed4;
1632
1633         lnet_fault_init();
1634         lnet_proc_init();
1635
1636         mutex_unlock(&the_lnet.ln_api_mutex);
1637
1638         return 0;
1639
1640 failed4:
1641         lnet_ping_target_fini();
1642 failed3:
1643         the_lnet.ln_refcount = 0;
1644         lnet_acceptor_stop();
1645 failed2:
1646         if (!the_lnet.ln_nis_from_mod_params)
1647                 lnet_destroy_routes();
1648 failed1:
1649         lnet_shutdown_lndnis();
1650 failed0:
1651         lnet_unprepare();
1652         LASSERT(rc < 0);
1653         mutex_unlock(&the_lnet.ln_api_mutex);
1654         while (!list_empty(&net_head)) {
1655                 struct lnet_ni *ni;
1656                 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1657                 list_del_init(&ni->ni_list);
1658                 lnet_ni_free(ni);
1659         }
1660         return rc;
1661 }
1662 EXPORT_SYMBOL(LNetNIInit);
1663
1664 /**
1665  * Stop LNet interfaces, routing, and forwarding.
1666  *
1667  * Users must call this function once for each successful call to LNetNIInit().
1668  * Once the LNetNIFini() operation has been started, the results of pending
1669  * API operations are undefined.
1670  *
1671  * \return always 0 for current implementation.
1672  */
1673 int
1674 LNetNIFini()
1675 {
1676         mutex_lock(&the_lnet.ln_api_mutex);
1677
1678         LASSERT (the_lnet.ln_refcount > 0);
1679
1680         if (the_lnet.ln_refcount != 1) {
1681                 the_lnet.ln_refcount--;
1682         } else {
1683                 LASSERT(!the_lnet.ln_niinit_self);
1684
1685                 lnet_fault_fini();
1686
1687                 lnet_proc_fini();
1688                 lnet_router_checker_stop();
1689                 lnet_ping_target_fini();
1690
1691                 /* Teardown fns that use my own API functions BEFORE here */
1692                 the_lnet.ln_refcount = 0;
1693
1694                 lnet_acceptor_stop();
1695                 lnet_destroy_routes();
1696                 lnet_shutdown_lndnis();
1697                 lnet_unprepare();
1698         }
1699
1700         mutex_unlock(&the_lnet.ln_api_mutex);
1701         return 0;
1702 }
1703 EXPORT_SYMBOL(LNetNIFini);
1704
1705 /**
1706  * Grabs the ni data from the ni structure and fills the out
1707  * parameters
1708  *
1709  * \param[in] ni network        interface structure
1710  * \param[out] cpt_count        the number of cpts the ni is on
1711  * \param[out] nid              Network Interface ID
1712  * \param[out] peer_timeout     NI peer timeout
1713  * \param[out] peer_tx_crdits   NI peer transmit credits
1714  * \param[out] peer_rtr_credits NI peer router credits
1715  * \param[out] max_tx_credits   NI max transmit credit
1716  * \param[out] net_config       Network configuration
1717  */
1718 static void
1719 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_data *config)
1720 {
1721         struct lnet_ioctl_net_config *net_config;
1722         struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
1723         size_t min_size, tunable_size = 0;
1724         int i;
1725
1726         if (!ni || !config)
1727                 return;
1728
1729         net_config = (struct lnet_ioctl_net_config *) config->cfg_bulk;
1730         if (!net_config)
1731                 return;
1732
1733         CLASSERT(ARRAY_SIZE(ni->ni_interfaces) ==
1734                  ARRAY_SIZE(net_config->ni_interfaces));
1735
1736         if (ni->ni_interfaces[0] != NULL) {
1737                 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
1738                         if (ni->ni_interfaces[i] != NULL) {
1739                                 strncpy(net_config->ni_interfaces[i],
1740                                         ni->ni_interfaces[i],
1741                                         sizeof(net_config->ni_interfaces[i]));
1742                         }
1743                 }
1744         }
1745
1746         config->cfg_nid = ni->ni_nid;
1747         config->cfg_config_u.cfg_net.net_peer_timeout = ni->ni_peertimeout;
1748         config->cfg_config_u.cfg_net.net_max_tx_credits = ni->ni_maxtxcredits;
1749         config->cfg_config_u.cfg_net.net_peer_tx_credits = ni->ni_peertxcredits;
1750         config->cfg_config_u.cfg_net.net_peer_rtr_credits = ni->ni_peerrtrcredits;
1751
1752         net_config->ni_status = ni->ni_status->ns_status;
1753
1754         for (i = 0;
1755              ni->ni_cpts != NULL && i < ni->ni_ncpts &&
1756              i < LNET_MAX_SHOW_NUM_CPT;
1757              i++)
1758                 net_config->ni_cpts[i] = ni->ni_cpts[i];
1759
1760         config->cfg_ncpts = ni->ni_ncpts;
1761
1762         /*
1763          * See if user land tools sent in a newer and larger version
1764          * of struct lnet_tunables than what the kernel uses.
1765          */
1766         min_size = sizeof(*config) + sizeof(*net_config);
1767
1768         if (config->cfg_hdr.ioc_len > min_size)
1769                 tunable_size = config->cfg_hdr.ioc_len - min_size;
1770
1771         /* Don't copy to much data to user space */
1772         min_size = min(tunable_size, sizeof(*ni->ni_lnd_tunables));
1773         lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
1774
1775         if (ni->ni_lnd_tunables && lnd_cfg && min_size) {
1776                 memcpy(lnd_cfg, ni->ni_lnd_tunables, min_size);
1777                 config->cfg_config_u.cfg_net.net_interface_count = 1;
1778
1779                 /* Tell user land that kernel side has less data */
1780                 if (tunable_size > sizeof(*ni->ni_lnd_tunables)) {
1781                         min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
1782                         config->cfg_hdr.ioc_len -= min_size;
1783                 }
1784         }
1785 }
1786
1787 static int
1788 lnet_get_net_config(struct lnet_ioctl_config_data *config)
1789 {
1790         struct lnet_ni *ni;
1791         struct list_head *tmp;
1792         int idx = config->cfg_count;
1793         int rc = -ENOENT;
1794         int cpt;
1795
1796         if (unlikely(!config->cfg_bulk))
1797                 return -EINVAL;
1798
1799         cpt = lnet_net_lock_current();
1800
1801         list_for_each(tmp, &the_lnet.ln_nis) {
1802                 ni = list_entry(tmp, lnet_ni_t, ni_list);
1803                 if (idx-- == 0) {
1804                         rc = 0;
1805                         lnet_ni_lock(ni);
1806                         lnet_fill_ni_info(ni, config);
1807                         lnet_ni_unlock(ni);
1808                         break;
1809                 }
1810         }
1811
1812         lnet_net_unlock(cpt);
1813         return rc;
1814 }
1815
1816 int
1817 lnet_dyn_add_ni(lnet_pid_t requested_pid, struct lnet_ioctl_config_data *conf)
1818 {
1819         char                    *nets = conf->cfg_config_u.cfg_net.net_intf;
1820         lnet_ping_info_t        *pinfo;
1821         lnet_handle_md_t        md_handle;
1822         struct lnet_ni          *ni;
1823         struct list_head        net_head;
1824         int                     rc;
1825         lnet_remotenet_t        *rnet;
1826
1827         INIT_LIST_HEAD(&net_head);
1828
1829         /* Create a ni structure for the network string */
1830         rc = lnet_parse_networks(&net_head, nets);
1831         if (rc <= 0)
1832                 return rc == 0 ? -EINVAL : rc;
1833
1834         mutex_lock(&the_lnet.ln_api_mutex);
1835
1836         if (rc > 1) {
1837                 rc = -EINVAL; /* only add one interface per call */
1838                 goto failed0;
1839         }
1840
1841         ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1842
1843         lnet_net_lock(LNET_LOCK_EX);
1844         rnet = lnet_find_net_locked(LNET_NIDNET(ni->ni_nid));
1845         lnet_net_unlock(LNET_LOCK_EX);
1846         /* make sure that the net added doesn't invalidate the current
1847          * configuration LNet is keeping */
1848         if (rnet != NULL) {
1849                 CERROR("Adding net %s will invalidate routing configuration\n",
1850                        nets);
1851                 rc = -EUSERS;
1852                 goto failed0;
1853         }
1854
1855         rc = lnet_ping_info_setup(&pinfo, &md_handle, 1 + lnet_get_ni_count(),
1856                                   false);
1857         if (rc != 0)
1858                 goto failed0;
1859
1860         list_del_init(&ni->ni_list);
1861
1862         rc = lnet_startup_lndni(ni, conf);
1863         if (rc != 0)
1864                 goto failed1;
1865
1866         if (ni->ni_lnd->lnd_accept != NULL) {
1867                 rc = lnet_acceptor_start();
1868                 if (rc < 0) {
1869                         /* shutdown the ni that we just started */
1870                         CERROR("Failed to start up acceptor thread\n");
1871                         lnet_shutdown_lndni(ni);
1872                         goto failed1;
1873                 }
1874         }
1875
1876         lnet_ping_target_update(pinfo, md_handle);
1877         mutex_unlock(&the_lnet.ln_api_mutex);
1878
1879         return 0;
1880
1881 failed1:
1882         lnet_ping_md_unlink(pinfo, &md_handle);
1883         lnet_ping_info_free(pinfo);
1884 failed0:
1885         mutex_unlock(&the_lnet.ln_api_mutex);
1886         while (!list_empty(&net_head)) {
1887                 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1888                 list_del_init(&ni->ni_list);
1889                 lnet_ni_free(ni);
1890         }
1891         return rc;
1892 }
1893
1894 int
1895 lnet_dyn_del_ni(__u32 net)
1896 {
1897         lnet_ni_t        *ni;
1898         lnet_ping_info_t *pinfo;
1899         lnet_handle_md_t  md_handle;
1900         int               rc;
1901
1902         /* don't allow userspace to shutdown the LOLND */
1903         if (LNET_NETTYP(net) == LOLND)
1904                 return -EINVAL;
1905
1906         mutex_lock(&the_lnet.ln_api_mutex);
1907         /* create and link a new ping info, before removing the old one */
1908         rc = lnet_ping_info_setup(&pinfo, &md_handle,
1909                                   lnet_get_ni_count() - 1, false);
1910         if (rc != 0)
1911                 goto out;
1912
1913         ni = lnet_net2ni(net);
1914         if (ni == NULL) {
1915                 rc = -EINVAL;
1916                 goto failed;
1917         }
1918
1919         /* decrement the reference counter taken by lnet_net2ni() */
1920         lnet_ni_decref_locked(ni, 0);
1921
1922         lnet_shutdown_lndni(ni);
1923
1924         if (lnet_count_acceptor_nis() == 0)
1925                 lnet_acceptor_stop();
1926
1927         lnet_ping_target_update(pinfo, md_handle);
1928         goto out;
1929 failed:
1930         lnet_ping_md_unlink(pinfo, &md_handle);
1931         lnet_ping_info_free(pinfo);
1932 out:
1933         mutex_unlock(&the_lnet.ln_api_mutex);
1934
1935         return rc;
1936 }
1937
1938 /**
1939  * LNet ioctl handler.
1940  *
1941  */
1942 int
1943 LNetCtl(unsigned int cmd, void *arg)
1944 {
1945         struct libcfs_ioctl_data *data = arg;
1946         struct lnet_ioctl_config_data *config;
1947         lnet_process_id_t         id = {0};
1948         lnet_ni_t                *ni;
1949         int                       rc;
1950
1951         CLASSERT(LIBCFS_IOC_DATA_MAX >= sizeof(struct lnet_ioctl_net_config) +
1952                                         sizeof(struct lnet_ioctl_config_data));
1953
1954         switch (cmd) {
1955         case IOC_LIBCFS_GET_NI:
1956                 rc = LNetGetId(data->ioc_count, &id);
1957                 data->ioc_nid = id.nid;
1958                 return rc;
1959
1960         case IOC_LIBCFS_FAIL_NID:
1961                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1962
1963         case IOC_LIBCFS_ADD_ROUTE:
1964                 config = arg;
1965
1966                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1967                         return -EINVAL;
1968
1969                 mutex_lock(&the_lnet.ln_api_mutex);
1970                 rc = lnet_add_route(config->cfg_net,
1971                                     config->cfg_config_u.cfg_route.rtr_hop,
1972                                     config->cfg_nid,
1973                                     config->cfg_config_u.cfg_route.
1974                                         rtr_priority);
1975                 if (rc == 0) {
1976                         rc = lnet_check_routes();
1977                         if (rc != 0)
1978                                 lnet_del_route(config->cfg_net,
1979                                                config->cfg_nid);
1980                 }
1981                 mutex_unlock(&the_lnet.ln_api_mutex);
1982                 return rc;
1983
1984         case IOC_LIBCFS_DEL_ROUTE:
1985                 config = arg;
1986
1987                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1988                         return -EINVAL;
1989
1990                 mutex_lock(&the_lnet.ln_api_mutex);
1991                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
1992                 mutex_unlock(&the_lnet.ln_api_mutex);
1993                 return rc;
1994
1995         case IOC_LIBCFS_GET_ROUTE:
1996                 config = arg;
1997
1998                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1999                         return -EINVAL;
2000
2001                 return lnet_get_route(config->cfg_count,
2002                                       &config->cfg_net,
2003                                       &config->cfg_config_u.cfg_route.rtr_hop,
2004                                       &config->cfg_nid,
2005                                       &config->cfg_config_u.cfg_route.rtr_flags,
2006                                       &config->cfg_config_u.cfg_route.
2007                                         rtr_priority);
2008
2009         case IOC_LIBCFS_GET_NET: {
2010                 size_t total = sizeof(*config) +
2011                                sizeof(struct lnet_ioctl_net_config);
2012                 config = arg;
2013
2014                 if (config->cfg_hdr.ioc_len < total)
2015                         return -EINVAL;
2016
2017                 return lnet_get_net_config(config);
2018         }
2019
2020         case IOC_LIBCFS_GET_LNET_STATS:
2021         {
2022                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
2023
2024                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
2025                         return -EINVAL;
2026
2027                 lnet_counters_get(&lnet_stats->st_cntrs);
2028                 return 0;
2029         }
2030
2031         case IOC_LIBCFS_CONFIG_RTR:
2032                 config = arg;
2033
2034                 if (config->cfg_hdr.ioc_len < sizeof(*config))
2035                         return -EINVAL;
2036
2037                 mutex_lock(&the_lnet.ln_api_mutex);
2038                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
2039                         rc = lnet_rtrpools_enable();
2040                         mutex_unlock(&the_lnet.ln_api_mutex);
2041                         return rc;
2042                 }
2043                 lnet_rtrpools_disable();
2044                 mutex_unlock(&the_lnet.ln_api_mutex);
2045                 return 0;
2046
2047         case IOC_LIBCFS_ADD_BUF:
2048                 config = arg;
2049
2050                 if (config->cfg_hdr.ioc_len < sizeof(*config))
2051                         return -EINVAL;
2052
2053                 mutex_lock(&the_lnet.ln_api_mutex);
2054                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.
2055                                                 buf_tiny,
2056                                           config->cfg_config_u.cfg_buffers.
2057                                                 buf_small,
2058                                           config->cfg_config_u.cfg_buffers.
2059                                                 buf_large);
2060                 mutex_unlock(&the_lnet.ln_api_mutex);
2061                 return rc;
2062
2063         case IOC_LIBCFS_GET_BUF: {
2064                 struct lnet_ioctl_pool_cfg *pool_cfg;
2065                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
2066
2067                 config = arg;
2068
2069                 if (config->cfg_hdr.ioc_len < total)
2070                         return -EINVAL;
2071
2072                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
2073                 return lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
2074         }
2075
2076         case IOC_LIBCFS_GET_PEER_INFO: {
2077                 struct lnet_ioctl_peer *peer_info = arg;
2078
2079                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
2080                         return -EINVAL;
2081
2082                 return lnet_get_peer_info(
2083                    peer_info->pr_count,
2084                    &peer_info->pr_nid,
2085                    peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
2086                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
2087                    &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
2088                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
2089                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
2090                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
2091                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_rtr_credits,
2092                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
2093         }
2094
2095         case IOC_LIBCFS_NOTIFY_ROUTER:
2096                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
2097                                    cfs_time_current() -
2098                                    cfs_time_seconds(cfs_time_current_sec() -
2099                                                     (time_t)data->ioc_u64[0]));
2100
2101         case IOC_LIBCFS_LNET_DIST:
2102                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
2103                 if (rc < 0 && rc != -EHOSTUNREACH)
2104                         return rc;
2105
2106                 data->ioc_u32[0] = rc;
2107                 return 0;
2108
2109         case IOC_LIBCFS_TESTPROTOCOMPAT:
2110                 lnet_net_lock(LNET_LOCK_EX);
2111                 the_lnet.ln_testprotocompat = data->ioc_flags;
2112                 lnet_net_unlock(LNET_LOCK_EX);
2113                 return 0;
2114
2115         case IOC_LIBCFS_LNET_FAULT:
2116                 return lnet_fault_ctl(data->ioc_flags, data);
2117
2118         case IOC_LIBCFS_PING:
2119                 id.nid = data->ioc_nid;
2120                 id.pid = data->ioc_u32[0];
2121                 rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
2122                                data->ioc_pbuf1,
2123                                data->ioc_plen1/sizeof(lnet_process_id_t));
2124                 if (rc < 0)
2125                         return rc;
2126                 data->ioc_count = rc;
2127                 return 0;
2128
2129         default:
2130                 ni = lnet_net2ni(data->ioc_net);
2131                 if (ni == NULL)
2132                         return -EINVAL;
2133
2134                 if (ni->ni_lnd->lnd_ctl == NULL)
2135                         rc = -EINVAL;
2136                 else
2137                         rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
2138
2139                 lnet_ni_decref(ni);
2140                 return rc;
2141         }
2142         /* not reached */
2143 }
2144 EXPORT_SYMBOL(LNetCtl);
2145
2146 void LNetDebugPeer(lnet_process_id_t id)
2147 {
2148         lnet_debug_peer(id.nid);
2149 }
2150 EXPORT_SYMBOL(LNetDebugPeer);
2151
2152 /**
2153  * Retrieve the lnet_process_id_t ID of LNet interface at \a index. Note that
2154  * all interfaces share a same PID, as requested by LNetNIInit().
2155  *
2156  * \param index Index of the interface to look up.
2157  * \param id On successful return, this location will hold the
2158  * lnet_process_id_t ID of the interface.
2159  *
2160  * \retval 0 If an interface exists at \a index.
2161  * \retval -ENOENT If no interface has been found.
2162  */
2163 int
2164 LNetGetId(unsigned int index, lnet_process_id_t *id)
2165 {
2166         struct lnet_ni   *ni;
2167         struct list_head *tmp;
2168         int               cpt;
2169         int               rc = -ENOENT;
2170
2171         LASSERT(the_lnet.ln_refcount > 0);
2172
2173         cpt = lnet_net_lock_current();
2174
2175         list_for_each(tmp, &the_lnet.ln_nis) {
2176                 if (index-- != 0)
2177                         continue;
2178
2179                 ni = list_entry(tmp, lnet_ni_t, ni_list);
2180
2181                 id->nid = ni->ni_nid;
2182                 id->pid = the_lnet.ln_pid;
2183                 rc = 0;
2184                 break;
2185         }
2186
2187         lnet_net_unlock(cpt);
2188         return rc;
2189 }
2190 EXPORT_SYMBOL(LNetGetId);
2191
2192 /**
2193  * Print a string representation of handle \a h into buffer \a str of
2194  * \a len bytes.
2195  */
2196 void
2197 LNetSnprintHandle(char *str, int len, lnet_handle_any_t h)
2198 {
2199         snprintf(str, len, "%#llx", h.cookie);
2200 }
2201 EXPORT_SYMBOL(LNetSnprintHandle);
2202
2203 static int
2204 lnet_ping(lnet_process_id_t id, int timeout_ms, lnet_process_id_t __user *ids,
2205           int n_ids)
2206 {
2207         lnet_handle_eq_t     eqh;
2208         lnet_handle_md_t     mdh;
2209         lnet_event_t         event;
2210         lnet_md_t            md = { NULL };
2211         int                  which;
2212         int                  unlinked = 0;
2213         int                  replied = 0;
2214         const int            a_long_time = 60000; /* mS */
2215         int                  infosz;
2216         lnet_ping_info_t    *info;
2217         lnet_process_id_t    tmpid;
2218         int                  i;
2219         int                  nob;
2220         int                  rc;
2221         int                  rc2;
2222         sigset_t         blocked;
2223
2224         infosz = offsetof(lnet_ping_info_t, pi_ni[n_ids]);
2225
2226         if (n_ids <= 0 ||
2227             id.nid == LNET_NID_ANY ||
2228             timeout_ms > 500000 ||              /* arbitrary limit! */
2229             n_ids > 20)                         /* arbitrary limit! */
2230                 return -EINVAL;
2231
2232         if (id.pid == LNET_PID_ANY)
2233                 id.pid = LNET_PID_LUSTRE;
2234
2235         LIBCFS_ALLOC(info, infosz);
2236         if (info == NULL)
2237                 return -ENOMEM;
2238
2239         /* NB 2 events max (including any unlink event) */
2240         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
2241         if (rc != 0) {
2242                 CERROR("Can't allocate EQ: %d\n", rc);
2243                 goto out_0;
2244         }
2245
2246         /* initialize md content */
2247         md.start     = info;
2248         md.length    = infosz;
2249         md.threshold = 2; /*GET/REPLY*/
2250         md.max_size  = 0;
2251         md.options   = LNET_MD_TRUNCATE;
2252         md.user_ptr  = NULL;
2253         md.eq_handle = eqh;
2254
2255         rc = LNetMDBind(md, LNET_UNLINK, &mdh);
2256         if (rc != 0) {
2257                 CERROR("Can't bind MD: %d\n", rc);
2258                 goto out_1;
2259         }
2260
2261         rc = LNetGet(LNET_NID_ANY, mdh, id,
2262                      LNET_RESERVED_PORTAL,
2263                      LNET_PROTO_PING_MATCHBITS, 0);
2264
2265         if (rc != 0) {
2266                 /* Don't CERROR; this could be deliberate! */
2267
2268                 rc2 = LNetMDUnlink(mdh);
2269                 LASSERT(rc2 == 0);
2270
2271                 /* NB must wait for the UNLINK event below... */
2272                 unlinked = 1;
2273                 timeout_ms = a_long_time;
2274         }
2275
2276         do {
2277                 /* MUST block for unlink to complete */
2278                 if (unlinked)
2279                         blocked = cfs_block_allsigs();
2280
2281                 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
2282
2283                 if (unlinked)
2284                         cfs_restore_sigs(blocked);
2285
2286                 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
2287                        (rc2 <= 0) ? -1 : event.type,
2288                        (rc2 <= 0) ? -1 : event.status,
2289                        (rc2 > 0 && event.unlinked) ? " unlinked" : "");
2290
2291                 LASSERT(rc2 != -EOVERFLOW);     /* can't miss anything */
2292
2293                 if (rc2 <= 0 || event.status != 0) {
2294                         /* timeout or error */
2295                         if (!replied && rc == 0)
2296                                 rc = (rc2 < 0) ? rc2 :
2297                                      (rc2 == 0) ? -ETIMEDOUT :
2298                                      event.status;
2299
2300                         if (!unlinked) {
2301                                 /* Ensure completion in finite time... */
2302                                 LNetMDUnlink(mdh);
2303                                 /* No assertion (racing with network) */
2304                                 unlinked = 1;
2305                                 timeout_ms = a_long_time;
2306                         } else if (rc2 == 0) {
2307                                 /* timed out waiting for unlink */
2308                                 CWARN("ping %s: late network completion\n",
2309                                       libcfs_id2str(id));
2310                         }
2311                 } else if (event.type == LNET_EVENT_REPLY) {
2312                         replied = 1;
2313                         rc = event.mlength;
2314                 }
2315
2316         } while (rc2 <= 0 || !event.unlinked);
2317
2318         if (!replied) {
2319                 if (rc >= 0)
2320                         CWARN("%s: Unexpected rc >= 0 but no reply!\n",
2321                               libcfs_id2str(id));
2322                 rc = -EIO;
2323                 goto out_1;
2324         }
2325
2326         nob = rc;
2327         LASSERT(nob >= 0 && nob <= infosz);
2328
2329         rc = -EPROTO;                           /* if I can't parse... */
2330
2331         if (nob < 8) {
2332                 /* can't check magic/version */
2333                 CERROR("%s: ping info too short %d\n",
2334                        libcfs_id2str(id), nob);
2335                 goto out_1;
2336         }
2337
2338         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
2339                 lnet_swap_pinginfo(info);
2340         } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
2341                 CERROR("%s: Unexpected magic %08x\n",
2342                        libcfs_id2str(id), info->pi_magic);
2343                 goto out_1;
2344         }
2345
2346         if ((info->pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
2347                 CERROR("%s: ping w/o NI status: 0x%x\n",
2348                        libcfs_id2str(id), info->pi_features);
2349                 goto out_1;
2350         }
2351
2352         if (nob < offsetof(lnet_ping_info_t, pi_ni[0])) {
2353                 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
2354                        nob, (int)offsetof(lnet_ping_info_t, pi_ni[0]));
2355                 goto out_1;
2356         }
2357
2358         if (info->pi_nnis < n_ids)
2359                 n_ids = info->pi_nnis;
2360
2361         if (nob < offsetof(lnet_ping_info_t, pi_ni[n_ids])) {
2362                 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
2363                        nob, (int)offsetof(lnet_ping_info_t, pi_ni[n_ids]));
2364                 goto out_1;
2365         }
2366
2367         rc = -EFAULT;                           /* If I SEGV... */
2368
2369         memset(&tmpid, 0, sizeof(tmpid));
2370         for (i = 0; i < n_ids; i++) {
2371                 tmpid.pid = info->pi_pid;
2372                 tmpid.nid = info->pi_ni[i].ns_nid;
2373                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
2374                         goto out_1;
2375         }
2376         rc = info->pi_nnis;
2377
2378  out_1:
2379         rc2 = LNetEQFree(eqh);
2380         if (rc2 != 0)
2381                 CERROR("rc2 %d\n", rc2);
2382         LASSERT(rc2 == 0);
2383
2384  out_0:
2385         LIBCFS_FREE(info, infosz);
2386         return rc;
2387 }