lnet/lnet/api-ni.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.sf.net/projects/lustre/
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #define DEBUG_SUBSYSTEM S_LNET
  23 #include <lnet/lib-lnet.h>
  24
  25 #ifdef __KERNEL__
  26 #define D_LNI D_CONSOLE
  27 #else
  28 #define D_LNI D_CONFIG
  29 #endif
  30
  31 lnet_t      the_lnet;                           /* THE state of the network */
  32
  33 #ifdef __KERNEL__
  34
  35 static char *ip2nets = "";
  36 CFS_MODULE_PARM(ip2nets, "s", charp, 0444,
  37                 "LNET network <- IP table");
  38
  39 static char *networks = "";
  40 CFS_MODULE_PARM(networks, "s", charp, 0444,
  41                 "local networks");
  42
  43 static char *routes = "";
  44 CFS_MODULE_PARM(routes, "s", charp, 0444,
  45                 "routes to non-local networks");
  46
  47 static char *portals_compatibility = "none";
  48 CFS_MODULE_PARM(portals_compatibility, "s", charp, 0444,
  49                 "wire protocol compatibility: 'strong'|'weak'|'none'");
  50
  51 char *
  52 lnet_get_routes(void)
  53 {
  54         return routes;
  55 }
  56
  57 char *
  58 lnet_get_networks(void)
  59 {
  60         char   *nets;
  61         int     rc;
  62
  63         if (*networks != 0 && *ip2nets != 0) {
  64                 LCONSOLE_ERROR("Please specify EITHER 'networks' or 'ip2nets'"
  65                                " but not both at once\n");
  66                 return NULL;
  67         }
  68
  69         if (*ip2nets != 0) {
  70                 rc = lnet_parse_ip2nets(&nets, ip2nets);
  71                 return (rc == 0) ? nets : NULL;
  72         }
  73
  74         if (*networks != 0)
  75                 return networks;
  76
  77         return "tcp";
  78 }
  79
  80 int
  81 lnet_get_portals_compatibility(void)
  82 {
  83         if (!strcmp(portals_compatibility, "none")) {
  84                 return 0;
  85         }
  86
  87         if (!strcmp(portals_compatibility, "weak")) {
  88                 return 1;
  89                 LCONSOLE_WARN("Starting in weak portals-compatible mode\n");
  90         }
  91
  92         if (!strcmp(portals_compatibility, "strong")) {
  93                 return 2;
  94                 LCONSOLE_WARN("Starting in strong portals-compatible mode\n");
  95         }
  96
  97         LCONSOLE_ERROR("portals_compatibility=\"%s\" not supported\n",
  98                        portals_compatibility);
  99         return -EINVAL;
 100 }
 101
 102 void
 103 lnet_init_locks(void)
 104 {
 105         spin_lock_init (&the_lnet.ln_lock);
 106         cfs_waitq_init (&the_lnet.ln_waitq);
 107         init_mutex(&the_lnet.ln_lnd_mutex);
 108         init_mutex(&the_lnet.ln_api_mutex);
 109 }
 110
 111 void
 112 lnet_fini_locks(void)
 113 {
 114 }
 115
 116 #else
 117
 118 char *
 119 lnet_get_routes(void)
 120 {
 121         char *str = getenv("LNET_ROUTES");
 122
 123         return (str == NULL) ? "" : str;
 124 }
 125
 126 char *
 127 lnet_get_networks (void)
 128 {
 129         static char       default_networks[256];
 130         char             *networks = getenv ("LNET_NETWORKS");
 131         char             *ip2nets  = getenv ("LNET_IP2NETS");
 132         char             *str;
 133         char             *sep;
 134         int               len;
 135         int               nob;
 136         int               rc;
 137         struct list_head *tmp;
 138
 139 #ifdef NOT_YET
 140         if (networks != NULL && ip2nets != NULL) {
 141                 LCONSOLE_ERROR("Please set EITHER 'LNET_NETWORKS' or "
 142                                "'LNET_IP2NETS' but not both at once\n");
 143                 return NULL;
 144         }
 145
 146         if (ip2nets != NULL) {
 147                 rc = lnet_parse_ip2nets(&networks, ip2nets);
 148                 return (rc == 0) ? networks : NULL;
 149         }
 150 #else
 151         ip2nets = NULL;
 152         rc = 0;
 153 #endif
 154         if (networks != NULL)
 155                 return networks;
 156
 157         /* In userland, the default 'networks=' is the list of known net types */
 158
 159         len = sizeof(default_networks);
 160         str = default_networks;
 161         *str = 0;
 162         sep = "";
 163
 164         list_for_each (tmp, &the_lnet.ln_lnds) {
 165                         lnd_t *lnd = list_entry(tmp, lnd_t, lnd_list);
 166
 167                         nob = snprintf(str, len, "%s%s", sep,
 168                                        libcfs_lnd2str(lnd->lnd_type));
 169                         len -= nob;
 170                         if (len < 0) {
 171                                 /* overflowed the string; leave it where it was */
 172                                 *str = 0;
 173                                 break;
 174                         }
 175
 176                         str += nob;
 177                         sep = ",";
 178         }
 179
 180         return default_networks;
 181 }
 182
 183 int
 184 lnet_get_portals_compatibility(void)
 185 {
 186         return 0;
 187 }
 188
 189 # if !HAVE_LIBPTHREAD
 190
 191 void lnet_init_locks(void)
 192 {
 193         the_lnet.ln_lock = 0;
 194         the_lnet.ln_lnd_mutex = 0;
 195         the_lnet.ln_api_mutex = 0;
 196 }
 197
 198 void lnet_fini_locks(void)
 199 {
 200         LASSERT (the_lnet.ln_api_mutex == 0);
 201         LASSERT (the_lnet.ln_lnd_mutex == 0);
 202         LASSERT (the_lnet.ln_lock == 0);
 203 }
 204
 205 # else
 206
 207 void lnet_init_locks(void)
 208 {
 209         pthread_cond_init(&the_lnet.ln_cond, NULL);
 210         pthread_mutex_init(&the_lnet.ln_lock, NULL);
 211         pthread_mutex_init(&the_lnet.ln_lnd_mutex, NULL);
 212         pthread_mutex_init(&the_lnet.ln_api_mutex, NULL);
 213 }
 214
 215 void lnet_fini_locks(void)
 216 {
 217         pthread_mutex_destroy(&the_lnet.ln_api_mutex);
 218         pthread_mutex_destroy(&the_lnet.ln_lnd_mutex);
 219         pthread_mutex_destroy(&the_lnet.ln_lock);
 220         pthread_cond_destroy(&the_lnet.ln_cond);
 221 }
 222
 223 # endif
 224 #endif
 225
 226 void lnet_assert_wire_constants (void)
 227 {
 228         /* Wire protocol assertions generated by 'wirecheck'
 229          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 230          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 231          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
 232
 233         /* Constants... */
 234         CLASSERT (LNET_PROTO_TCP_MAGIC == 0xeebc0ded);
 235         CLASSERT (LNET_PROTO_TCP_VERSION_MAJOR == 1);
 236         CLASSERT (LNET_PROTO_TCP_VERSION_MINOR == 0);
 237         CLASSERT (LNET_MSG_ACK == 0);
 238         CLASSERT (LNET_MSG_PUT == 1);
 239         CLASSERT (LNET_MSG_GET == 2);
 240         CLASSERT (LNET_MSG_REPLY == 3);
 241         CLASSERT (LNET_MSG_HELLO == 4);
 242
 243         /* Checks for struct ptl_handle_wire_t */
 244         CLASSERT ((int)sizeof(lnet_handle_wire_t) == 16);
 245         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_interface_cookie) == 0);
 246         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_interface_cookie) == 8);
 247         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_object_cookie) == 8);
 248         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_object_cookie) == 8);
 249
 250         /* Checks for struct lnet_magicversion_t */
 251         CLASSERT ((int)sizeof(lnet_magicversion_t) == 8);
 252         CLASSERT ((int)offsetof(lnet_magicversion_t, magic) == 0);
 253         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->magic) == 4);
 254         CLASSERT ((int)offsetof(lnet_magicversion_t, version_major) == 4);
 255         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_major) == 2);
 256         CLASSERT ((int)offsetof(lnet_magicversion_t, version_minor) == 6);
 257         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_minor) == 2);
 258
 259         /* Checks for struct lnet_hdr_t */
 260         CLASSERT ((int)sizeof(lnet_hdr_t) == 72);
 261         CLASSERT ((int)offsetof(lnet_hdr_t, dest_nid) == 0);
 262         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_nid) == 8);
 263         CLASSERT ((int)offsetof(lnet_hdr_t, src_nid) == 8);
 264         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_nid) == 8);
 265         CLASSERT ((int)offsetof(lnet_hdr_t, dest_pid) == 16);
 266         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_pid) == 4);
 267         CLASSERT ((int)offsetof(lnet_hdr_t, src_pid) == 20);
 268         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_pid) == 4);
 269         CLASSERT ((int)offsetof(lnet_hdr_t, type) == 24);
 270         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->type) == 4);
 271         CLASSERT ((int)offsetof(lnet_hdr_t, payload_length) == 28);
 272         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->payload_length) == 4);
 273         CLASSERT ((int)offsetof(lnet_hdr_t, msg) == 32);
 274         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg) == 40);
 275
 276         /* Ack */
 277         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.dst_wmd) == 32);
 278         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.dst_wmd) == 16);
 279         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.match_bits) == 48);
 280         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.match_bits) == 8);
 281         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.mlength) == 56);
 282         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.mlength) == 4);
 283
 284         /* Put */
 285         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ack_wmd) == 32);
 286         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ack_wmd) == 16);
 287         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.match_bits) == 48);
 288         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.match_bits) == 8);
 289         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.hdr_data) == 56);
 290         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.hdr_data) == 8);
 291         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ptl_index) == 64);
 292         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ptl_index) == 4);
 293         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.offset) == 68);
 294         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.offset) == 4);
 295
 296         /* Get */
 297         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.return_wmd) == 32);
 298         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.return_wmd) == 16);
 299         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.match_bits) == 48);
 300         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.match_bits) == 8);
 301         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.ptl_index) == 56);
 302         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.ptl_index) == 4);
 303         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.src_offset) == 60);
 304         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.src_offset) == 4);
 305         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.sink_length) == 64);
 306         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.sink_length) == 4);
 307
 308         /* Reply */
 309         CLASSERT ((int)offsetof(lnet_hdr_t, msg.reply.dst_wmd) == 32);
 310         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.reply.dst_wmd) == 16);
 311
 312         /* Hello */
 313         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.incarnation) == 32);
 314         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.incarnation) == 8);
 315         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.type) == 40);
 316         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.type) == 4);
 317 }
 318
 319 lnd_t *
 320 lnet_find_lnd_by_type (int type)
 321 {
 322         lnd_t              *lnd;
 323         struct list_head   *tmp;
 324
 325         /* holding lnd mutex */
 326         list_for_each (tmp, &the_lnet.ln_lnds) {
 327                 lnd = list_entry(tmp, lnd_t, lnd_list);
 328
 329                 if (lnd->lnd_type == type)
 330                         return lnd;
 331         }
 332
 333         return NULL;
 334 }
 335
 336 void
 337 lnet_register_lnd (lnd_t *lnd)
 338 {
 339         LNET_MUTEX_DOWN(&the_lnet.ln_lnd_mutex);
 340
 341         LASSERT (the_lnet.ln_init);
 342         LASSERT (libcfs_isknown_lnd(lnd->lnd_type));
 343         LASSERT (lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 344
 345         list_add_tail (&lnd->lnd_list, &the_lnet.ln_lnds);
 346         lnd->lnd_refcount = 0;
 347
 348         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 349
 350         LNET_MUTEX_UP(&the_lnet.ln_lnd_mutex);
 351 }
 352
 353 void
 354 lnet_unregister_lnd (lnd_t *lnd)
 355 {
 356         LNET_MUTEX_DOWN(&the_lnet.ln_lnd_mutex);
 357
 358         LASSERT (the_lnet.ln_init);
 359         LASSERT (lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 360         LASSERT (lnd->lnd_refcount == 0);
 361
 362         list_del (&lnd->lnd_list);
 363         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 364
 365         LNET_MUTEX_UP(&the_lnet.ln_lnd_mutex);
 366 }
 367
 368 #ifndef LNET_USE_LIB_FREELIST
 369
 370 int
 371 lnet_descriptor_setup (void)
 372 {
 373         return 0;
 374 }
 375
 376 void
 377 lnet_descriptor_cleanup (void)
 378 {
 379 }
 380
 381 #else
 382
 383 int
 384 lnet_freelist_init (lnet_freelist_t *fl, int n, int size)
 385 {
 386         char *space;
 387
 388         LASSERT (n > 0);
 389
 390         size += offsetof (lnet_freeobj_t, fo_contents);
 391
 392         LIBCFS_ALLOC(space, n * size);
 393         if (space == NULL)
 394                 return (-ENOMEM);
 395
 396         CFS_INIT_LIST_HEAD (&fl->fl_list);
 397         fl->fl_objs = space;
 398         fl->fl_nobjs = n;
 399         fl->fl_objsize = size;
 400
 401         do
 402         {
 403                 memset (space, 0, size);
 404                 list_add ((struct list_head *)space, &fl->fl_list);
 405                 space += size;
 406         } while (--n != 0);
 407
 408         return (0);
 409 }
 410
 411 void
 412 lnet_freelist_fini (lnet_freelist_t *fl)
 413 {
 414         struct list_head *el;
 415         int               count;
 416
 417         if (fl->fl_nobjs == 0)
 418                 return;
 419
 420         count = 0;
 421         for (el = fl->fl_list.next; el != &fl->fl_list; el = el->next)
 422                 count++;
 423
 424         LASSERT (count == fl->fl_nobjs);
 425
 426         LIBCFS_FREE(fl->fl_objs, fl->fl_nobjs * fl->fl_objsize);
 427         memset (fl, 0, sizeof (fl));
 428 }
 429
 430 int
 431 lnet_descriptor_setup (void)
 432 {
 433         /* NB on failure caller must still call lnet_descriptor_cleanup */
 434         /*               ******                                         */
 435         int        rc;
 436
 437         memset (&the_lnet.ln_free_mes,  0, sizeof (the_lnet.ln_free_mes));
 438         memset (&the_lnet.ln_free_msgs, 0, sizeof (the_lnet.ln_free_msgs));
 439         memset (&the_lnet.ln_free_mds,  0, sizeof (the_lnet.ln_free_mds));
 440         memset (&the_lnet.ln_free_eqs,  0, sizeof (the_lnet.ln_free_eqs));
 441
 442         rc = lnet_freelist_init(&the_lnet.ln_free_mes,
 443                                 MAX_MES, sizeof (lnet_me_t));
 444         if (rc != 0)
 445                 return (rc);
 446
 447         rc = lnet_freelist_init(&the_lnet.ln_free_msgs,
 448                                 MAX_MSGS, sizeof (lnet_msg_t));
 449         if (rc != 0)
 450                 return (rc);
 451
 452         rc = lnet_freelist_init(&the_lnet.ln_free_mds,
 453                                 MAX_MDS, sizeof (lnet_libmd_t));
 454         if (rc != 0)
 455                 return (rc);
 456
 457         rc = lnet_freelist_init(&the_lnet.ln_free_eqs,
 458                                 MAX_EQS, sizeof (lnet_eq_t));
 459         return (rc);
 460 }
 461
 462 void
 463 lnet_descriptor_cleanup (void)
 464 {
 465         lnet_freelist_fini (&the_lnet.ln_free_mes);
 466         lnet_freelist_fini (&the_lnet.ln_free_msgs);
 467         lnet_freelist_fini (&the_lnet.ln_free_mds);
 468         lnet_freelist_fini (&the_lnet.ln_free_eqs);
 469 }
 470
 471 #endif
 472
 473 __u64
 474 lnet_create_interface_cookie (void)
 475 {
 476         /* NB the interface cookie in wire handles guards against delayed
 477          * replies and ACKs appearing valid after reboot. Initialisation time,
 478          * even if it's only implemented to millisecond resolution is probably
 479          * easily good enough. */
 480         struct timeval tv;
 481         __u64          cookie;
 482 #ifndef __KERNEL__
 483         int            rc = gettimeofday (&tv, NULL);
 484         LASSERT (rc == 0);
 485 #else
 486         do_gettimeofday(&tv);
 487 #endif
 488         cookie = tv.tv_sec;
 489         cookie *= 1000000;
 490         cookie += tv.tv_usec;
 491         return cookie;
 492 }
 493
 494 int
 495 lnet_setup_handle_hash (void)
 496 {
 497         int       i;
 498
 499         /* Arbitrary choice of hash table size */
 500 #ifdef __KERNEL__
 501         the_lnet.ln_lh_hash_size = CFS_PAGE_SIZE / sizeof (struct list_head);
 502 #else
 503         the_lnet.ln_lh_hash_size = (MAX_MES + MAX_MDS + MAX_EQS)/4;
 504 #endif
 505         LIBCFS_ALLOC(the_lnet.ln_lh_hash_table,
 506                      the_lnet.ln_lh_hash_size * sizeof (struct list_head));
 507         if (the_lnet.ln_lh_hash_table == NULL)
 508                 return (-ENOMEM);
 509
 510         for (i = 0; i < the_lnet.ln_lh_hash_size; i++)
 511                 CFS_INIT_LIST_HEAD (&the_lnet.ln_lh_hash_table[i]);
 512
 513         the_lnet.ln_next_object_cookie = LNET_COOKIE_TYPES;
 514
 515         return (0);
 516 }
 517
 518 void
 519 lnet_cleanup_handle_hash (void)
 520 {
 521         if (the_lnet.ln_lh_hash_table == NULL)
 522                 return;
 523
 524         LIBCFS_FREE(the_lnet.ln_lh_hash_table,
 525                     the_lnet.ln_lh_hash_size * sizeof (struct list_head));
 526 }
 527
 528 lnet_libhandle_t *
 529 lnet_lookup_cookie (__u64 cookie, int type)
 530 {
 531         /* ALWAYS called with LNET_LOCK held */
 532         struct list_head    *list;
 533         struct list_head    *el;
 534         unsigned int         hash;
 535
 536         if ((cookie & (LNET_COOKIE_TYPES - 1)) != type)
 537                 return (NULL);
 538
 539         hash = ((unsigned int)cookie) % the_lnet.ln_lh_hash_size;
 540         list = &the_lnet.ln_lh_hash_table[hash];
 541
 542         list_for_each (el, list) {
 543                 lnet_libhandle_t *lh = list_entry (el, lnet_libhandle_t,
 544                                                   lh_hash_chain);
 545
 546                 if (lh->lh_cookie == cookie)
 547                         return (lh);
 548         }
 549
 550         return (NULL);
 551 }
 552
 553 void
 554 lnet_initialise_handle (lnet_libhandle_t *lh, int type)
 555 {
 556         /* ALWAYS called with LNET_LOCK held */
 557         unsigned int    hash;
 558
 559         LASSERT (type >= 0 && type < LNET_COOKIE_TYPES);
 560         lh->lh_cookie = the_lnet.ln_next_object_cookie | type;
 561         the_lnet.ln_next_object_cookie += LNET_COOKIE_TYPES;
 562
 563         hash = ((unsigned int)lh->lh_cookie) % the_lnet.ln_lh_hash_size;
 564         list_add (&lh->lh_hash_chain, &the_lnet.ln_lh_hash_table[hash]);
 565 }
 566
 567 void
 568 lnet_invalidate_handle (lnet_libhandle_t *lh)
 569 {
 570         /* ALWAYS called with LNET_LOCK held */
 571         list_del (&lh->lh_hash_chain);
 572 }
 573
 574 int
 575 lnet_init_finalizers(void)
 576 {
 577 #ifdef __KERNEL__
 578         int    i;
 579
 580         the_lnet.ln_nfinalizers = num_online_cpus();
 581
 582         LIBCFS_ALLOC(the_lnet.ln_finalizers,
 583                      the_lnet.ln_nfinalizers *
 584                      sizeof(*the_lnet.ln_finalizers));
 585         if (the_lnet.ln_finalizers == NULL) {
 586                 CERROR("Can't allocate ln_finalizers\n");
 587                 return -ENOMEM;
 588         }
 589
 590         for (i = 0; i < the_lnet.ln_nfinalizers; i++)
 591                 the_lnet.ln_finalizers[i] = NULL;
 592 #else
 593         the_lnet.ln_finalizing = 0;
 594 #endif
 595
 596         CFS_INIT_LIST_HEAD(&the_lnet.ln_finalizeq);
 597         return 0;
 598 }
 599
 600 void
 601 lnet_fini_finalizers(void)
 602 {
 603 #ifdef __KERNEL__
 604         int    i;
 605
 606         for (i = 0; i < the_lnet.ln_nfinalizers; i++)
 607                 LASSERT (the_lnet.ln_finalizers[i] == NULL);
 608
 609         LIBCFS_FREE(the_lnet.ln_finalizers,
 610                     the_lnet.ln_nfinalizers *
 611                     sizeof(*the_lnet.ln_finalizers));
 612 #else
 613         LASSERT (!the_lnet.ln_finalizing);
 614 #endif
 615         LASSERT (list_empty(&the_lnet.ln_finalizeq));
 616 }
 617
 618 int
 619 lnet_prepare(lnet_pid_t requested_pid)
 620 {
 621         /* Prepare to bring up the network */
 622         int               rc = 0;
 623         int               i;
 624
 625         LASSERT (the_lnet.ln_refcount == 0);
 626
 627         the_lnet.ln_routing = 0;
 628
 629 #ifdef __KERNEL__
 630         LASSERT ((requested_pid & LNET_PID_USERFLAG) == 0);
 631         the_lnet.ln_pid = requested_pid;
 632 #else
 633         /* My PID must be unique on this node and flag I'm userspace */
 634         the_lnet.ln_pid = getpid() | LNET_PID_USERFLAG;
 635 #endif
 636
 637         rc = lnet_descriptor_setup();
 638         if (rc != 0)
 639                 goto failed0;
 640
 641         memset(&the_lnet.ln_counters, 0,
 642                sizeof(the_lnet.ln_counters));
 643
 644         CFS_INIT_LIST_HEAD (&the_lnet.ln_active_msgs);
 645         CFS_INIT_LIST_HEAD (&the_lnet.ln_active_mds);
 646         CFS_INIT_LIST_HEAD (&the_lnet.ln_active_eqs);
 647         CFS_INIT_LIST_HEAD (&the_lnet.ln_test_peers);
 648         CFS_INIT_LIST_HEAD (&the_lnet.ln_nis);
 649         CFS_INIT_LIST_HEAD (&the_lnet.ln_zombie_nis);
 650         CFS_INIT_LIST_HEAD (&the_lnet.ln_remote_nets);
 651         CFS_INIT_LIST_HEAD (&the_lnet.ln_routers);
 652
 653         the_lnet.ln_interface_cookie = lnet_create_interface_cookie();
 654
 655         lnet_init_rtrpools();
 656
 657         rc = lnet_setup_handle_hash ();
 658         if (rc != 0)
 659                 goto failed0;
 660
 661         rc = lnet_create_peer_table();
 662         if (rc != 0)
 663                 goto failed1;
 664
 665         rc = lnet_init_finalizers();
 666         if (rc != 0)
 667                 goto failed2;
 668
 669         the_lnet.ln_nportals = MAX_PORTALS;
 670         LIBCFS_ALLOC(the_lnet.ln_portals,
 671                      the_lnet.ln_nportals *
 672                      sizeof(*the_lnet.ln_portals));
 673         if (the_lnet.ln_portals == NULL) {
 674                 rc = -ENOMEM;
 675                 goto failed3;
 676         }
 677
 678         for (i = 0; i < the_lnet.ln_nportals; i++) {
 679                 CFS_INIT_LIST_HEAD(&(the_lnet.ln_portals[i].ptl_ml));
 680                 CFS_INIT_LIST_HEAD(&(the_lnet.ln_portals[i].ptl_msgq));
 681                 the_lnet.ln_portals[i].ptl_options = 0;
 682         }
 683
 684         return 0;
 685
 686  failed3:
 687         lnet_fini_finalizers();
 688  failed2:
 689         lnet_destroy_peer_table();
 690  failed1:
 691         lnet_cleanup_handle_hash();
 692  failed0:
 693         lnet_descriptor_cleanup();
 694         return rc;
 695 }
 696
 697 int
 698 lnet_unprepare (void)
 699 {
 700         int       idx;
 701
 702         /* NB no LNET_LOCK since this is the last reference.  All LND instances
 703          * have shut down already, so it is safe to unlink and free all
 704          * descriptors, even those that appear committed to a network op (eg MD
 705          * with non-zero pending count) */
 706
 707         lnet_fail_nid(LNET_NID_ANY, 0);
 708
 709         LASSERT (list_empty(&the_lnet.ln_test_peers));
 710         LASSERT (the_lnet.ln_refcount == 0);
 711         LASSERT (list_empty(&the_lnet.ln_nis));
 712         LASSERT (list_empty(&the_lnet.ln_zombie_nis));
 713         LASSERT (the_lnet.ln_nzombie_nis == 0);
 714
 715         for (idx = 0; idx < the_lnet.ln_nportals; idx++) {
 716
 717                 LNetClearLazyPortal(idx);
 718                 LASSERT (list_empty(&the_lnet.ln_portals[idx].ptl_msgq));
 719
 720                 while (!list_empty (&the_lnet.ln_portals[idx].ptl_ml)) {
 721                         lnet_me_t *me = list_entry (the_lnet.ln_portals[idx].ptl_ml.next,
 722                                                     lnet_me_t, me_list);
 723
 724                         CERROR ("Active me %p on exit\n", me);
 725                         list_del (&me->me_list);
 726                         lnet_me_free (me);
 727                 }
 728         }
 729
 730         while (!list_empty (&the_lnet.ln_active_mds)) {
 731                 lnet_libmd_t *md = list_entry (the_lnet.ln_active_mds.next,
 732                                                lnet_libmd_t, md_list);
 733
 734                 CERROR ("Active md %p on exit\n", md);
 735                 list_del (&md->md_list);
 736                 lnet_md_free (md);
 737         }
 738
 739         while (!list_empty (&the_lnet.ln_active_eqs)) {
 740                 lnet_eq_t *eq = list_entry (the_lnet.ln_active_eqs.next,
 741                                             lnet_eq_t, eq_list);
 742
 743                 CERROR ("Active eq %p on exit\n", eq);
 744                 list_del (&eq->eq_list);
 745                 lnet_eq_free (eq);
 746         }
 747
 748         while (!list_empty (&the_lnet.ln_active_msgs)) {
 749                 lnet_msg_t *msg = list_entry (the_lnet.ln_active_msgs.next,
 750                                               lnet_msg_t, msg_activelist);
 751
 752                 CERROR ("Active msg %p on exit\n", msg);
 753                 LASSERT (msg->msg_onactivelist);
 754                 list_del (&msg->msg_activelist);
 755                 lnet_msg_free (msg);
 756         }
 757
 758         LIBCFS_FREE(the_lnet.ln_portals,
 759                     the_lnet.ln_nportals * sizeof(*the_lnet.ln_portals));
 760
 761         lnet_free_rtrpools();
 762         lnet_fini_finalizers();
 763         lnet_destroy_peer_table();
 764         lnet_cleanup_handle_hash();
 765         lnet_descriptor_cleanup();
 766
 767         return (0);
 768 }
 769
 770 lnet_ni_t  *
 771 lnet_net2ni_locked (__u32 net)
 772 {
 773         struct list_head *tmp;
 774         lnet_ni_t        *ni;
 775
 776         list_for_each (tmp, &the_lnet.ln_nis) {
 777                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 778
 779                 if (lnet_ptlcompat_matchnet(LNET_NIDNET(ni->ni_nid), net)) {
 780                         lnet_ni_addref_locked(ni);
 781                         return ni;
 782                 }
 783         }
 784
 785         return NULL;
 786 }
 787
 788 int
 789 lnet_islocalnet (__u32 net)
 790 {
 791         lnet_ni_t        *ni;
 792
 793         LNET_LOCK();
 794         ni = lnet_net2ni_locked(net);
 795         if (ni != NULL)
 796                 lnet_ni_decref_locked(ni);
 797         LNET_UNLOCK();
 798
 799         return ni != NULL;
 800 }
 801
 802 lnet_ni_t  *
 803 lnet_nid2ni_locked (lnet_nid_t nid)
 804 {
 805         struct list_head *tmp;
 806         lnet_ni_t        *ni;
 807
 808         list_for_each (tmp, &the_lnet.ln_nis) {
 809                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 810
 811                 if (lnet_ptlcompat_matchnid(ni->ni_nid, nid)) {
 812                         lnet_ni_addref_locked(ni);
 813                         return ni;
 814                 }
 815         }
 816
 817         return NULL;
 818 }
 819
 820 int
 821 lnet_islocalnid (lnet_nid_t nid)
 822 {
 823         lnet_ni_t     *ni;
 824
 825         LNET_LOCK();
 826         ni = lnet_nid2ni_locked(nid);
 827         if (ni != NULL)
 828                 lnet_ni_decref_locked(ni);
 829         LNET_UNLOCK();
 830
 831         return ni != NULL;
 832 }
 833
 834 int
 835 lnet_count_acceptor_nis (lnet_ni_t **first_ni)
 836 {
 837         /* Return the # of NIs that need the acceptor.  Return the first one in
 838          * *first_ni so the acceptor can pass it connections "blind" to retain
 839          * binary compatibility. */
 840         int                count = 0;
 841 #ifdef __KERNEL__
 842         struct list_head  *tmp;
 843         lnet_ni_t         *ni;
 844
 845         LNET_LOCK();
 846         list_for_each (tmp, &the_lnet.ln_nis) {
 847                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 848
 849                 if (ni->ni_lnd->lnd_accept != NULL) {
 850                         /* This LND uses the acceptor */
 851                         if (count == 0 && first_ni != NULL) {
 852                                 lnet_ni_addref_locked(ni);
 853                                 *first_ni = ni;
 854                         }
 855                         count++;
 856                 }
 857         }
 858
 859         LNET_UNLOCK();
 860 #endif
 861         return count;
 862 }
 863
 864 void
 865 lnet_shutdown_lndnis (void)
 866 {
 867         int                i;
 868         int                islo;
 869         lnet_ni_t         *ni;
 870
 871         /* NB called holding the global mutex */
 872
 873         /* All quiet on the API front */
 874         LASSERT (!the_lnet.ln_shutdown);
 875         LASSERT (the_lnet.ln_refcount == 0);
 876         LASSERT (list_empty(&the_lnet.ln_zombie_nis));
 877         LASSERT (the_lnet.ln_nzombie_nis == 0);
 878         LASSERT (list_empty(&the_lnet.ln_remote_nets));
 879
 880         LNET_LOCK();
 881         the_lnet.ln_shutdown = 1;               /* flag shutdown */
 882
 883         /* Unlink NIs from the global table */
 884         while (!list_empty(&the_lnet.ln_nis)) {
 885                 ni = list_entry(the_lnet.ln_nis.next,
 886                                 lnet_ni_t, ni_list);
 887                 list_del (&ni->ni_list);
 888
 889                 the_lnet.ln_nzombie_nis++;
 890                 lnet_ni_decref_locked(ni); /* drop apini's ref */
 891         }
 892
 893         /* Drop the cached eqwait NI. */
 894         if (the_lnet.ln_eqwaitni != NULL) {
 895                 lnet_ni_decref_locked(the_lnet.ln_eqwaitni);
 896                 the_lnet.ln_eqwaitni = NULL;
 897         }
 898
 899         /* Drop the cached loopback NI. */
 900         if (the_lnet.ln_loni != NULL) {
 901                 lnet_ni_decref_locked(the_lnet.ln_loni);
 902                 the_lnet.ln_loni = NULL;
 903         }
 904
 905         LNET_UNLOCK();
 906         /* Clear the peer table and wait for all peers to go (they hold refs on
 907          * their NIs) */
 908
 909         lnet_clear_peer_table();
 910
 911         LNET_LOCK();
 912         /* Now wait for the NI's I just nuked to show up on apini_zombie_nis
 913          * and shut them down in guaranteed thread context */
 914         i = 2;
 915         while (the_lnet.ln_nzombie_nis != 0) {
 916
 917                 while (list_empty(&the_lnet.ln_zombie_nis)) {
 918                         LNET_UNLOCK();
 919                         ++i;
 920                         if ((i & (-i)) == i)
 921                                 CDEBUG(D_WARNING,"Waiting for %d zombie NIs\n",
 922                                        the_lnet.ln_nzombie_nis);
 923                         cfs_pause(cfs_time_seconds(1));
 924                         LNET_LOCK();
 925                 }
 926
 927                 ni = list_entry(the_lnet.ln_zombie_nis.next,
 928                                 lnet_ni_t, ni_list);
 929                 list_del(&ni->ni_list);
 930                 ni->ni_lnd->lnd_refcount--;
 931
 932                 LNET_UNLOCK();
 933
 934                 islo = ni->ni_lnd->lnd_type == LOLND;
 935
 936                 LASSERT (!in_interrupt ());
 937                 (ni->ni_lnd->lnd_shutdown)(ni);
 938
 939                 /* can't deref lnd anymore now; it might have unregistered
 940                  * itself...  */
 941
 942                 if (!islo)
 943                         CDEBUG(D_LNI, "Removed LNI %s\n",
 944                                libcfs_nid2str(ni->ni_nid));
 945
 946                 LIBCFS_FREE(ni, sizeof(*ni));
 947
 948                 LNET_LOCK();
 949                 the_lnet.ln_nzombie_nis--;
 950         }
 951
 952         the_lnet.ln_shutdown = 0;
 953         LNET_UNLOCK();
 954
 955         if (the_lnet.ln_network_tokens != NULL) {
 956                 LIBCFS_FREE(the_lnet.ln_network_tokens,
 957                             the_lnet.ln_network_tokens_nob);
 958                 the_lnet.ln_network_tokens = NULL;
 959         }
 960 }
 961
 962 int
 963 lnet_startup_lndnis (void)
 964 {
 965         lnd_t             *lnd;
 966         lnet_ni_t         *ni;
 967         struct list_head   nilist;
 968         int                rc = 0;
 969         int                lnd_type;
 970         int                nicount = 0;
 971         char              *nets = lnet_get_networks();
 972
 973         INIT_LIST_HEAD(&nilist);
 974
 975         if (nets == NULL)
 976                 goto failed;
 977
 978         rc = lnet_parse_networks(&nilist, nets);
 979         if (rc != 0)
 980                 goto failed;
 981
 982         while (!list_empty(&nilist)) {
 983                 ni = list_entry(nilist.next, lnet_ni_t, ni_list);
 984                 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
 985
 986                 LASSERT (libcfs_isknown_lnd(lnd_type));
 987
 988                 LNET_MUTEX_DOWN(&the_lnet.ln_lnd_mutex);
 989                 lnd = lnet_find_lnd_by_type(lnd_type);
 990
 991 #ifdef __KERNEL__
 992                 if (lnd == NULL) {
 993                         LNET_MUTEX_UP(&the_lnet.ln_lnd_mutex);
 994                         rc = request_module(libcfs_lnd2modname(lnd_type));
 995                         LNET_MUTEX_DOWN(&the_lnet.ln_lnd_mutex);
 996
 997                         lnd = lnet_find_lnd_by_type(lnd_type);
 998                         if (lnd == NULL) {
 999                                 LNET_MUTEX_UP(&the_lnet.ln_lnd_mutex);
1000                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
1001                                        libcfs_lnd2str(lnd_type),
1002                                        libcfs_lnd2modname(lnd_type), rc);
1003 #ifndef CONFIG_KMOD
1004                                 LCONSOLE_ERROR("Your kernel must be compiled "
1005                                                "with CONFIG_KMOD set for "
1006                                                "automatic module loading.");
1007 #endif
1008                                 goto failed;
1009                         }
1010                 }
1011 #else
1012                 if (lnd == NULL) {
1013                         LNET_MUTEX_UP(&the_lnet.ln_lnd_mutex);
1014                         CERROR("LND %s not supported\n",
1015                                libcfs_lnd2str(lnd_type));
1016                         goto failed;
1017                 }
1018 #endif
1019
1020                 ni->ni_refcount = 1;
1021
1022                 LNET_LOCK();
1023                 lnd->lnd_refcount++;
1024                 LNET_UNLOCK();
1025
1026                 ni->ni_lnd = lnd;
1027
1028                 rc = (lnd->lnd_startup)(ni);
1029
1030                 LNET_MUTEX_UP(&the_lnet.ln_lnd_mutex);
1031
1032                 if (rc != 0) {
1033                         LCONSOLE_ERROR("Error %d starting up LNI %s\n",
1034                                        rc, libcfs_lnd2str(lnd->lnd_type));
1035                         LNET_LOCK();
1036                         lnd->lnd_refcount--;
1037                         LNET_UNLOCK();
1038                         goto failed;
1039                 }
1040
1041                 list_del(&ni->ni_list);
1042
1043                 LNET_LOCK();
1044                 list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1045                 LNET_UNLOCK();
1046
1047                 if (lnd->lnd_type == LOLND) {
1048                         lnet_ni_addref(ni);
1049                         LASSERT (the_lnet.ln_loni == NULL);
1050                         the_lnet.ln_loni = ni;
1051                         continue;
1052                 }
1053
1054 #ifndef __KERNEL__
1055                 if (lnd->lnd_wait != NULL) {
1056                         if (the_lnet.ln_eqwaitni == NULL) {
1057                                 lnet_ni_addref(ni);
1058                                 the_lnet.ln_eqwaitni = ni;
1059                         }
1060                 } else {
1061 # if !HAVE_LIBPTHREAD
1062                         LCONSOLE_ERROR("LND %s not supported in a "
1063                                        "single-threaded runtime\n",
1064                                        libcfs_lnd2str(lnd_type));
1065                         goto failed;
1066 # endif
1067                 }
1068 #endif
1069                 if (ni->ni_peertxcredits == 0 ||
1070                     ni->ni_maxtxcredits == 0) {
1071                         LCONSOLE_ERROR("LNI %s has no %scredits\n",
1072                                        libcfs_lnd2str(lnd->lnd_type),
1073                                        ni->ni_peertxcredits == 0 ?
1074                                        "" : "per-peer ");
1075                         goto failed;
1076                 }
1077
1078                 ni->ni_txcredits = ni->ni_mintxcredits = ni->ni_maxtxcredits;
1079
1080                 CDEBUG(D_LNI, "Added LNI %s [%d/%d]\n",
1081                        libcfs_nid2str(ni->ni_nid),
1082                        ni->ni_peertxcredits, ni->ni_txcredits);
1083
1084                 /* Handle nidstrings for network 0 just like this one */
1085                 if (the_lnet.ln_ptlcompat > 0) {
1086                         if (nicount > 0) {
1087                                 LCONSOLE_ERROR("Can't run > 1 network when "
1088                                                "portals_compatibility is set\n");
1089                                 goto failed;
1090                         }
1091                         libcfs_setnet0alias(lnd->lnd_type);
1092                 }
1093
1094                 nicount++;
1095         }
1096
1097         if (the_lnet.ln_eqwaitni != NULL && nicount > 1) {
1098                 lnd_type = the_lnet.ln_eqwaitni->ni_lnd->lnd_type;
1099                 LCONSOLE_ERROR("LND %s can only run single-network\n",
1100                                libcfs_lnd2str(lnd_type));
1101                 goto failed;
1102         }
1103
1104         return 0;
1105
1106  failed:
1107         lnet_shutdown_lndnis();
1108
1109         while (!list_empty(&nilist)) {
1110                 ni = list_entry(nilist.next, lnet_ni_t, ni_list);
1111                 list_del(&ni->ni_list);
1112                 LIBCFS_FREE(ni, sizeof(*ni));
1113         }
1114
1115         return -ENETDOWN;
1116 }
1117
1118 int
1119 LNetInit(void)
1120 {
1121         int    rc;
1122
1123         lnet_assert_wire_constants ();
1124         LASSERT (!the_lnet.ln_init);
1125
1126         memset(&the_lnet, 0, sizeof(the_lnet));
1127
1128         rc = lnet_get_portals_compatibility();
1129         if (rc < 0)
1130                 return rc;
1131
1132         lnet_init_locks();
1133         CFS_INIT_LIST_HEAD(&the_lnet.ln_lnds);
1134         the_lnet.ln_ptlcompat = rc;
1135         the_lnet.ln_refcount = 0;
1136         the_lnet.ln_init = 1;
1137
1138 #ifdef __KERNEL__
1139         /* All LNDs apart from the LOLND are in separate modules.  They
1140          * register themselves when their module loads, and unregister
1141          * themselves when their module is unloaded. */
1142 #else
1143         /* Register LNDs
1144          * NB the order here determines default 'networks=' order */
1145 # ifdef CRAY_XT3
1146         LNET_REGISTER_ULND(the_ptllnd);
1147 # endif
1148 # if HAVE_LIBPTHREAD
1149         LNET_REGISTER_ULND(the_tcplnd);
1150 # endif
1151 #endif
1152         lnet_register_lnd(&the_lolnd);
1153         return 0;
1154 }
1155
1156 void
1157 LNetFini(void)
1158 {
1159         LASSERT (the_lnet.ln_init);
1160         LASSERT (the_lnet.ln_refcount == 0);
1161
1162         while (!list_empty(&the_lnet.ln_lnds))
1163                 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1164                                                lnd_t, lnd_list));
1165         lnet_fini_locks();
1166
1167         the_lnet.ln_init = 0;
1168 }
1169
1170 int
1171 LNetNIInit(lnet_pid_t requested_pid)
1172 {
1173         int         im_a_router = 0;
1174         int         rc;
1175
1176         LNET_MUTEX_DOWN(&the_lnet.ln_api_mutex);
1177
1178         LASSERT (the_lnet.ln_init);
1179         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1180
1181         if (the_lnet.ln_refcount > 0) {
1182                 rc = the_lnet.ln_refcount++;
1183                 goto out;
1184         }
1185
1186         if (requested_pid == LNET_PID_ANY) {
1187                 /* Don't instantiate LNET just for me */
1188                 rc = -ENETDOWN;
1189                 goto failed0;
1190         }
1191
1192         rc = lnet_prepare(requested_pid);
1193         if (rc != 0)
1194                 goto failed0;
1195
1196         rc = lnet_startup_lndnis();
1197         if (rc != 0)
1198                 goto failed1;
1199
1200         rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1201         if (rc != 0)
1202                 goto failed2;
1203
1204         rc = lnet_check_routes();
1205         if (rc != 0)
1206                 goto failed2;
1207
1208         rc = lnet_alloc_rtrpools(im_a_router);
1209         if (rc != 0)
1210                 goto failed2;
1211
1212         rc = lnet_acceptor_start();
1213         if (rc != 0)
1214                 goto failed2;
1215
1216         the_lnet.ln_refcount = 1;
1217         /* Now I may use my own API functions... */
1218
1219         rc = lnet_router_checker_start();
1220         if (rc != 0)
1221                 goto failed3;
1222
1223         rc = lnet_ping_target_init();
1224         if (rc != 0)
1225                 goto failed4;
1226
1227         lnet_proc_init();
1228         goto out;
1229
1230  failed4:
1231         lnet_router_checker_stop();
1232  failed3:
1233         the_lnet.ln_refcount = 0;
1234         lnet_acceptor_stop();
1235  failed2:
1236         lnet_destroy_routes();
1237         lnet_shutdown_lndnis();
1238  failed1:
1239         lnet_unprepare();
1240  failed0:
1241         LASSERT (rc < 0);
1242  out:
1243         LNET_MUTEX_UP(&the_lnet.ln_api_mutex);
1244         return rc;
1245 }
1246
1247 int
1248 LNetNIFini()
1249 {
1250         LNET_MUTEX_DOWN(&the_lnet.ln_api_mutex);
1251
1252         LASSERT (the_lnet.ln_init);
1253         LASSERT (the_lnet.ln_refcount > 0);
1254
1255         if (the_lnet.ln_refcount != 1) {
1256                 the_lnet.ln_refcount--;
1257         } else {
1258                 LASSERT (!the_lnet.ln_niinit_self);
1259
1260                 lnet_proc_fini();
1261                 lnet_ping_target_fini();
1262                 lnet_router_checker_stop();
1263
1264                 /* Teardown fns that use my own API functions BEFORE here */
1265                 the_lnet.ln_refcount = 0;
1266
1267                 lnet_acceptor_stop();
1268                 lnet_destroy_routes();
1269                 lnet_shutdown_lndnis();
1270                 lnet_unprepare();
1271         }
1272
1273         LNET_MUTEX_UP(&the_lnet.ln_api_mutex);
1274         return 0;
1275 }
1276
1277 int
1278 LNetCtl(unsigned int cmd, void *arg)
1279 {
1280         struct libcfs_ioctl_data *data = arg;
1281         lnet_process_id_t         id;
1282         lnet_ni_t                *ni;
1283         int                       rc;
1284
1285         LASSERT (the_lnet.ln_init);
1286         LASSERT (the_lnet.ln_refcount > 0);
1287
1288         switch (cmd) {
1289         case IOC_LIBCFS_GET_NI:
1290                 rc = LNetGetId(data->ioc_count, &id);
1291                 data->ioc_nid = id.nid;
1292                 return rc;
1293
1294         case IOC_LIBCFS_FAIL_NID:
1295                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1296
1297         case IOC_LIBCFS_ADD_ROUTE:
1298                 rc = lnet_add_route(data->ioc_net, data->ioc_count,
1299                                     data->ioc_nid);
1300                 return (rc != 0) ? rc : lnet_check_routes();
1301
1302         case IOC_LIBCFS_DEL_ROUTE:
1303                 return lnet_del_route(data->ioc_net, data->ioc_nid);
1304
1305         case IOC_LIBCFS_GET_ROUTE:
1306                 return lnet_get_route(data->ioc_count,
1307                                       &data->ioc_net, &data->ioc_count,
1308                                       &data->ioc_nid, &data->ioc_flags);
1309         case IOC_LIBCFS_NOTIFY_ROUTER:
1310                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
1311                                    (time_t)data->ioc_u64[0]);
1312
1313         case IOC_LIBCFS_PORTALS_COMPATIBILITY:
1314                 return the_lnet.ln_ptlcompat;
1315
1316         case IOC_LIBCFS_LNET_DIST:
1317                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
1318                 if (rc < 0 && rc != -EHOSTUNREACH)
1319                         return rc;
1320
1321                 data->ioc_u32[0] = rc;
1322                 return 0;
1323
1324         case IOC_LIBCFS_TESTPROTOCOMPAT:
1325                 LNET_LOCK();
1326                 the_lnet.ln_testprotocompat = data->ioc_flags;
1327                 LNET_UNLOCK();
1328                 return 0;
1329
1330         case IOC_LIBCFS_PING:
1331                 rc = lnet_ping((lnet_process_id_t) {.nid = data->ioc_nid,
1332                                                     .pid = data->ioc_u32[0]},
1333                                data->ioc_u32[1], /* timeout */
1334                                (lnet_process_id_t *)data->ioc_pbuf1,
1335                                data->ioc_plen1/sizeof(lnet_process_id_t));
1336                 if (rc < 0)
1337                         return rc;
1338                 data->ioc_count = rc;
1339                 return 0;
1340
1341         case IOC_LIBCFS_DEBUG_PEER: {
1342                 /* CAVEAT EMPTOR: this one designed for calling directly; not
1343                  * via an ioctl */
1344                 lnet_process_id_t *id = arg;
1345
1346                 lnet_debug_peer(id->nid);
1347
1348                 ni = lnet_net2ni(LNET_NIDNET(id->nid));
1349                 if (ni == NULL) {
1350                         CDEBUG(D_WARNING, "No NI for %s\n", libcfs_id2str(*id));
1351                 } else {
1352                         if (ni->ni_lnd->lnd_ctl == NULL) {
1353                                 CDEBUG(D_WARNING, "No ctl for %s\n",
1354                                        libcfs_id2str(*id));
1355                         } else {
1356                                 (void)ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1357                         }
1358
1359                         lnet_ni_decref(ni);
1360                 }
1361                 return 0;
1362         }
1363
1364         default:
1365                 ni = lnet_net2ni(data->ioc_net);
1366                 if (ni == NULL)
1367                         return -EINVAL;
1368
1369                 if (ni->ni_lnd->lnd_ctl == NULL)
1370                         rc = -EINVAL;
1371                 else
1372                         rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1373
1374                 lnet_ni_decref(ni);
1375                 return rc;
1376         }
1377         /* not reached */
1378 }
1379
1380 int
1381 LNetGetId(unsigned int index, lnet_process_id_t *id)
1382 {
1383         lnet_ni_t        *ni;
1384         struct list_head *tmp;
1385         int               rc = -ENOENT;
1386
1387         LASSERT (the_lnet.ln_init);
1388         LASSERT (the_lnet.ln_refcount > 0);
1389
1390         LNET_LOCK();
1391
1392         list_for_each(tmp, &the_lnet.ln_nis) {
1393                 if (index-- != 0)
1394                         continue;
1395
1396                 ni = list_entry(tmp, lnet_ni_t, ni_list);
1397
1398                 id->nid = ni->ni_nid;
1399                 id->pid = the_lnet.ln_pid;
1400                 rc = 0;
1401                 break;
1402         }
1403
1404         LNET_UNLOCK();
1405
1406         return rc;
1407 }
1408
1409 void
1410 LNetSnprintHandle(char *str, int len, lnet_handle_any_t h)
1411 {
1412         snprintf(str, len, LPX64, h.cookie);
1413 }
1414
1415
1416 int
1417 lnet_ping_target_init(void)
1418 {
1419         lnet_handle_me_t  meh;
1420         lnet_process_id_t id;
1421         int               rc;
1422         int               rc2;
1423         int               n;
1424         int               infosz;
1425         int               i;
1426
1427         for (n = 0; ; n++) {
1428                 rc = LNetGetId(n, &id);
1429                 if (rc == -ENOENT)
1430                         break;
1431
1432                 LASSERT (rc == 0);
1433         }
1434
1435         infosz = offsetof(lnet_ping_info_t, pi_nid[n]);
1436         LIBCFS_ALLOC(the_lnet.ln_ping_info, infosz);
1437         if (the_lnet.ln_ping_info == NULL) {
1438                 CERROR("Can't allocate ping info[%d]\n", n);
1439                 return -ENOMEM;
1440         }
1441
1442         the_lnet.ln_ping_info->pi_magic   = LNET_PROTO_PING_MAGIC;
1443         the_lnet.ln_ping_info->pi_version = LNET_PROTO_PING_VERSION;
1444         the_lnet.ln_ping_info->pi_pid     = the_lnet.ln_pid;
1445         the_lnet.ln_ping_info->pi_nnids   = n;
1446
1447         for (i = 0; i < n; i++) {
1448                 rc = LNetGetId(i, &id);
1449                 LASSERT (rc == 0);
1450                 the_lnet.ln_ping_info->pi_nid[i] = id.nid;
1451         }
1452
1453         /* We can have a tiny EQ since we only need to see the unlink event on
1454          * teardown, which by definition is the last one! */
1455         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &the_lnet.ln_ping_target_eq);
1456         if (rc != 0) {
1457                 CERROR("Can't allocate ping EQ: %d\n", rc);
1458                 goto failed_0;
1459         }
1460
1461         rc = LNetMEAttach(LNET_RESERVED_PORTAL,
1462                           (lnet_process_id_t){.nid = LNET_NID_ANY,
1463                                               .pid = LNET_PID_ANY},
1464                           LNET_PROTO_PING_MATCHBITS, 0LL,
1465                           LNET_UNLINK, LNET_INS_AFTER,
1466                           &meh);
1467         if (rc != 0) {
1468                 CERROR("Can't create ping ME: %d\n", rc);
1469                 goto failed_1;
1470         }
1471
1472         rc = LNetMDAttach(meh,
1473                           (lnet_md_t){.start = the_lnet.ln_ping_info,
1474                                       .length = infosz,
1475                                       .threshold = LNET_MD_THRESH_INF,
1476                                       .options = (LNET_MD_OP_GET |
1477                                                   LNET_MD_TRUNCATE |
1478                                                   LNET_MD_MANAGE_REMOTE),
1479                                       .eq_handle = the_lnet.ln_ping_target_eq},
1480                           LNET_RETAIN,
1481                           &the_lnet.ln_ping_target_md);
1482         if (rc != 0) {
1483                 CERROR("Can't attach ping MD: %d\n", rc);
1484                 goto failed_2;
1485         }
1486
1487         return 0;
1488
1489  failed_2:
1490         rc2 = LNetMEUnlink(meh);
1491         LASSERT (rc2 == 0);
1492  failed_1:
1493         rc2 = LNetEQFree(the_lnet.ln_ping_target_eq);
1494         LASSERT (rc2 == 0);
1495  failed_0:
1496         LIBCFS_FREE(the_lnet.ln_ping_info, infosz);
1497
1498         return rc;
1499 }
1500
1501 void
1502 lnet_ping_target_fini(void)
1503 {
1504         lnet_event_t    event;
1505         int             rc;
1506         int             which;
1507         int             timeout_ms = 1000;
1508         cfs_sigset_t    blocked = cfs_block_allsigs();
1509
1510         LNetMDUnlink(the_lnet.ln_ping_target_md);
1511         /* NB md could be busy; this just starts the unlink */
1512
1513         for (;;) {
1514                 rc = LNetEQPoll(&the_lnet.ln_ping_target_eq, 1,
1515                                 timeout_ms, &event, &which);
1516
1517                 /* I expect overflow... */
1518                 LASSERT (rc >= 0 || rc == -EOVERFLOW);
1519
1520                 if (rc == 0) {
1521                         /* timed out: provide a diagnostic */
1522                         CWARN("Still waiting for ping MD to unlink\n");
1523                         timeout_ms *= 2;
1524                         continue;
1525                 }
1526
1527                 /* Got a valid event */
1528                 if (event.unlinked)
1529                         break;
1530         }
1531
1532         rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1533         LASSERT (rc == 0);
1534
1535         LIBCFS_FREE(the_lnet.ln_ping_info,
1536                     offsetof(lnet_ping_info_t,
1537                              pi_nid[the_lnet.ln_ping_info->pi_nnids]));
1538
1539         cfs_restore_sigs(blocked);
1540 }
1541
1542 int
1543 lnet_ping (lnet_process_id_t id, int timeout_ms, lnet_process_id_t *ids, int n_ids)
1544 {
1545         lnet_handle_eq_t     eqh;
1546         lnet_handle_md_t     mdh;
1547         lnet_event_t         event;
1548         int                  which;
1549         int                  unlinked = 0;
1550         int                  replied = 0;
1551         const int            a_long_time = 60000; /* mS */
1552         int                  infosz = offsetof(lnet_ping_info_t, pi_nid[n_ids]);
1553         lnet_ping_info_t    *info;
1554         lnet_process_id_t    tmpid;
1555         int                  i;
1556         int                  nob;
1557         int                  rc;
1558         int                  rc2;
1559         cfs_sigset_t         blocked;
1560
1561         if (n_ids <= 0 ||
1562             id.nid == LNET_NID_ANY ||
1563             timeout_ms > 500000 ||              /* arbitrary limit! */
1564             n_ids > 20)                         /* arbitrary limit! */
1565                 return -EINVAL;
1566
1567         if (id.pid == LNET_PID_ANY)
1568                 id.pid = LUSTRE_SRV_LNET_PID;
1569
1570         LIBCFS_ALLOC(info, infosz);
1571         if (info == NULL)
1572                 return -ENOMEM;
1573
1574         /* NB 2 events max (including any unlink event) */
1575         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
1576         if (rc != 0) {
1577                 CERROR("Can't allocate EQ: %d\n", rc);
1578                 goto out_0;
1579         }
1580
1581         rc = LNetMDBind((lnet_md_t){.start = info,
1582                                     .length = infosz,
1583                                     .threshold = 2, /* GET/REPLY */
1584                                     .options = LNET_MD_TRUNCATE,
1585                                     .eq_handle = eqh},
1586                         LNET_UNLINK,
1587                         &mdh);
1588         if (rc != 0) {
1589                 CERROR("Can't bind MD: %d\n", rc);
1590                 goto out_1;
1591         }
1592
1593         rc = LNetGet(LNET_NID_ANY, mdh, id,
1594                      LNET_RESERVED_PORTAL,
1595                      LNET_PROTO_PING_MATCHBITS, 0);
1596
1597         if (rc != 0) {
1598                 /* Don't CERROR; this could be deliberate! */
1599
1600                 rc2 = LNetMDUnlink(mdh);
1601                 LASSERT (rc2 == 0);
1602
1603                 /* NB must wait for the UNLINK event below... */
1604                 unlinked = 1;
1605                 timeout_ms = a_long_time;
1606         }
1607
1608         do {
1609                 /* MUST block for unlink to complete */
1610                 if (unlinked)
1611                         blocked = cfs_block_allsigs();
1612
1613                 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
1614
1615                 if (unlinked)
1616                         cfs_restore_sigs(blocked);
1617
1618                 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
1619                        (rc2 <= 0) ? -1 : event.type,
1620                        (rc2 <= 0) ? -1 : event.status,
1621                        (rc2 > 0 && event.unlinked) ? " unlinked" : "");
1622
1623                 LASSERT (rc2 != -EOVERFLOW);     /* can't miss anything */
1624
1625                 if (rc2 <= 0 || event.status != 0) {
1626                         /* timeout or error */
1627                         if (!replied && rc == 0)
1628                                 rc = (rc2 < 0) ? rc2 :
1629                                      (rc2 == 0) ? -ETIMEDOUT :
1630                                      event.status;
1631
1632                         if (!unlinked) {
1633                                 /* Ensure completion in finite time... */
1634                                 LNetMDUnlink(mdh);
1635                                 /* No assertion (racing with network) */
1636                                 unlinked = 1;
1637                                 timeout_ms = a_long_time;
1638                         } else if (rc2 == 0) {
1639                                 /* timed out waiting for unlink */
1640                                 CWARN("ping %s: late network completion\n",
1641                                       libcfs_id2str(id));
1642                         }
1643
1644                 } else if (event.type == LNET_EVENT_REPLY) {
1645                         replied = 1;
1646                         rc = event.mlength;
1647                 }
1648
1649         } while (rc2 <= 0 || !event.unlinked);
1650
1651         if (!replied) {
1652                 if (rc >= 0)
1653                         CWARN("%s: Unexpected rc >= 0 but no reply!\n",
1654                               libcfs_id2str(id));
1655                 rc = -EIO;
1656                 goto out_1;
1657         }
1658
1659         nob = rc;
1660         LASSERT (nob >= 0 && nob <= infosz);
1661
1662         rc = -EPROTO;                           /* if I can't parse... */
1663
1664         if (nob < 8) {
1665                 /* can't check magic/version */
1666                 CERROR("%s: ping info too short %d\n",
1667                        libcfs_id2str(id), nob);
1668                 goto out_1;
1669         }
1670
1671         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
1672                 /* NB I might be swabbing garbage until I check below, but it
1673                  * doesn't matter */
1674                 __swab32s(&info->pi_version);
1675                 __swab32s(&info->pi_pid);
1676                 __swab32s(&info->pi_nnids);
1677                 for (i = 0; i < info->pi_nnids && i < n_ids; i++)
1678                         __swab64s(&info->pi_nid[i]);
1679
1680         } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
1681                 CERROR("%s: Unexpected magic %08x\n",
1682                        libcfs_id2str(id), info->pi_magic);
1683                 goto out_1;
1684         }
1685
1686         if (info->pi_version != LNET_PROTO_PING_VERSION) {
1687                 CERROR("%s: Unexpected version 0x%x\n",
1688                        libcfs_id2str(id), info->pi_version);
1689                 goto out_1;
1690         }
1691
1692         if (nob < offsetof(lnet_ping_info_t, pi_nid[0])) {
1693                 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
1694                        nob, (int)offsetof(lnet_ping_info_t, pi_nid[0]));
1695                 goto out_1;
1696         }
1697
1698         if (info->pi_nnids < n_ids)
1699                 n_ids = info->pi_nnids;
1700
1701         if (nob < offsetof(lnet_ping_info_t, pi_nid[n_ids])) {
1702                 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
1703                        nob, (int)offsetof(lnet_ping_info_t, pi_nid[n_ids]));
1704                 goto out_1;
1705         }
1706
1707         rc = -EFAULT;                           /* If I SEGV... */
1708
1709         for (i = 0; i < n_ids; i++) {
1710                 tmpid.pid = info->pi_pid;
1711                 tmpid.nid = info->pi_nid[i];
1712 #ifdef __KERNEL__
1713                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
1714                         goto out_1;
1715 #else
1716                 ids[i] = tmpid;
1717 #endif
1718         }
1719         rc = info->pi_nnids;
1720
1721  out_1:
1722         rc2 = LNetEQFree(eqh);
1723         if (rc2 != 0)
1724                 CERROR("rc2 %d\n", rc2);
1725         LASSERT (rc2 == 0);
1726
1727  out_0:
1728         LIBCFS_FREE(info, infosz);
1729         return rc;
1730 }