drivers/staging/lustre/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, 2012, 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 "../../include/linux/lnet/lib-lnet.h"
  39 #include <linux/log2.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
  47 static char *ip2nets = "";
  48 module_param(ip2nets, charp, 0444);
  49 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
  50
  51 static char *networks = "";
  52 module_param(networks, charp, 0444);
  53 MODULE_PARM_DESC(networks, "local networks");
  54
  55 static char *routes = "";
  56 module_param(routes, charp, 0444);
  57 MODULE_PARM_DESC(routes, "routes to non-local networks");
  58
  59 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
  60 module_param(rnet_htable_size, int, 0444);
  61 MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
  62
  63 static char *
  64 lnet_get_routes(void)
  65 {
  66         return routes;
  67 }
  68
  69 static char *
  70 lnet_get_networks(void)
  71 {
  72         char   *nets;
  73         int     rc;
  74
  75         if (*networks != 0 && *ip2nets != 0) {
  76                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
  77                                    "'ip2nets' but not both at once\n");
  78                 return NULL;
  79         }
  80
  81         if (*ip2nets != 0) {
  82                 rc = lnet_parse_ip2nets(&nets, ip2nets);
  83                 return (rc == 0) ? nets : NULL;
  84         }
  85
  86         if (*networks != 0)
  87                 return networks;
  88
  89         return "tcp";
  90 }
  91
  92 static void
  93 lnet_init_locks(void)
  94 {
  95         spin_lock_init(&the_lnet.ln_eq_wait_lock);
  96         init_waitqueue_head(&the_lnet.ln_eq_waitq);
  97         mutex_init(&the_lnet.ln_lnd_mutex);
  98         mutex_init(&the_lnet.ln_api_mutex);
  99 }
 100
 101 static void
 102 lnet_fini_locks(void)
 103 {
 104 }
 105
 106
 107 static int
 108 lnet_create_remote_nets_table(void)
 109 {
 110         int             i;
 111         struct list_head        *hash;
 112
 113         LASSERT(the_lnet.ln_remote_nets_hash == NULL);
 114         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 115         LIBCFS_ALLOC(hash, LNET_REMOTE_NETS_HASH_SIZE * sizeof(*hash));
 116         if (hash == NULL) {
 117                 CERROR("Failed to create remote nets hash table\n");
 118                 return -ENOMEM;
 119         }
 120
 121         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 122                 INIT_LIST_HEAD(&hash[i]);
 123         the_lnet.ln_remote_nets_hash = hash;
 124         return 0;
 125 }
 126
 127 static void
 128 lnet_destroy_remote_nets_table(void)
 129 {
 130         int i;
 131
 132         if (the_lnet.ln_remote_nets_hash == NULL)
 133                 return;
 134
 135         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 136                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 137
 138         LIBCFS_FREE(the_lnet.ln_remote_nets_hash,
 139                     LNET_REMOTE_NETS_HASH_SIZE *
 140                     sizeof(the_lnet.ln_remote_nets_hash[0]));
 141         the_lnet.ln_remote_nets_hash = NULL;
 142 }
 143
 144 static void
 145 lnet_destroy_locks(void)
 146 {
 147         if (the_lnet.ln_res_lock != NULL) {
 148                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 149                 the_lnet.ln_res_lock = NULL;
 150         }
 151
 152         if (the_lnet.ln_net_lock != NULL) {
 153                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 154                 the_lnet.ln_net_lock = NULL;
 155         }
 156
 157         lnet_fini_locks();
 158 }
 159
 160 static int
 161 lnet_create_locks(void)
 162 {
 163         lnet_init_locks();
 164
 165         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 166         if (the_lnet.ln_res_lock == NULL)
 167                 goto failed;
 168
 169         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 170         if (the_lnet.ln_net_lock == NULL)
 171                 goto failed;
 172
 173         return 0;
 174
 175  failed:
 176         lnet_destroy_locks();
 177         return -ENOMEM;
 178 }
 179
 180 static void lnet_assert_wire_constants (void)
 181 {
 182         /* Wire protocol assertions generated by 'wirecheck'
 183          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 184          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 185          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
 186
 187         /* Constants... */
 188         CLASSERT (LNET_PROTO_TCP_MAGIC == 0xeebc0ded);
 189         CLASSERT (LNET_PROTO_TCP_VERSION_MAJOR == 1);
 190         CLASSERT (LNET_PROTO_TCP_VERSION_MINOR == 0);
 191         CLASSERT (LNET_MSG_ACK == 0);
 192         CLASSERT (LNET_MSG_PUT == 1);
 193         CLASSERT (LNET_MSG_GET == 2);
 194         CLASSERT (LNET_MSG_REPLY == 3);
 195         CLASSERT (LNET_MSG_HELLO == 4);
 196
 197         /* Checks for struct ptl_handle_wire_t */
 198         CLASSERT ((int)sizeof(lnet_handle_wire_t) == 16);
 199         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_interface_cookie) == 0);
 200         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_interface_cookie) == 8);
 201         CLASSERT ((int)offsetof(lnet_handle_wire_t, wh_object_cookie) == 8);
 202         CLASSERT ((int)sizeof(((lnet_handle_wire_t *)0)->wh_object_cookie) == 8);
 203
 204         /* Checks for struct lnet_magicversion_t */
 205         CLASSERT ((int)sizeof(lnet_magicversion_t) == 8);
 206         CLASSERT ((int)offsetof(lnet_magicversion_t, magic) == 0);
 207         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->magic) == 4);
 208         CLASSERT ((int)offsetof(lnet_magicversion_t, version_major) == 4);
 209         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_major) == 2);
 210         CLASSERT ((int)offsetof(lnet_magicversion_t, version_minor) == 6);
 211         CLASSERT ((int)sizeof(((lnet_magicversion_t *)0)->version_minor) == 2);
 212
 213         /* Checks for struct lnet_hdr_t */
 214         CLASSERT ((int)sizeof(lnet_hdr_t) == 72);
 215         CLASSERT ((int)offsetof(lnet_hdr_t, dest_nid) == 0);
 216         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_nid) == 8);
 217         CLASSERT ((int)offsetof(lnet_hdr_t, src_nid) == 8);
 218         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_nid) == 8);
 219         CLASSERT ((int)offsetof(lnet_hdr_t, dest_pid) == 16);
 220         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->dest_pid) == 4);
 221         CLASSERT ((int)offsetof(lnet_hdr_t, src_pid) == 20);
 222         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->src_pid) == 4);
 223         CLASSERT ((int)offsetof(lnet_hdr_t, type) == 24);
 224         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->type) == 4);
 225         CLASSERT ((int)offsetof(lnet_hdr_t, payload_length) == 28);
 226         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->payload_length) == 4);
 227         CLASSERT ((int)offsetof(lnet_hdr_t, msg) == 32);
 228         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg) == 40);
 229
 230         /* Ack */
 231         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.dst_wmd) == 32);
 232         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.dst_wmd) == 16);
 233         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.match_bits) == 48);
 234         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.match_bits) == 8);
 235         CLASSERT ((int)offsetof(lnet_hdr_t, msg.ack.mlength) == 56);
 236         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.ack.mlength) == 4);
 237
 238         /* Put */
 239         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ack_wmd) == 32);
 240         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ack_wmd) == 16);
 241         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.match_bits) == 48);
 242         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.match_bits) == 8);
 243         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.hdr_data) == 56);
 244         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.hdr_data) == 8);
 245         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.ptl_index) == 64);
 246         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.ptl_index) == 4);
 247         CLASSERT ((int)offsetof(lnet_hdr_t, msg.put.offset) == 68);
 248         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.put.offset) == 4);
 249
 250         /* Get */
 251         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.return_wmd) == 32);
 252         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.return_wmd) == 16);
 253         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.match_bits) == 48);
 254         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.match_bits) == 8);
 255         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.ptl_index) == 56);
 256         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.ptl_index) == 4);
 257         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.src_offset) == 60);
 258         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.src_offset) == 4);
 259         CLASSERT ((int)offsetof(lnet_hdr_t, msg.get.sink_length) == 64);
 260         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.get.sink_length) == 4);
 261
 262         /* Reply */
 263         CLASSERT ((int)offsetof(lnet_hdr_t, msg.reply.dst_wmd) == 32);
 264         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.reply.dst_wmd) == 16);
 265
 266         /* Hello */
 267         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.incarnation) == 32);
 268         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.incarnation) == 8);
 269         CLASSERT ((int)offsetof(lnet_hdr_t, msg.hello.type) == 40);
 270         CLASSERT ((int)sizeof(((lnet_hdr_t *)0)->msg.hello.type) == 4);
 271 }
 272
 273 static lnd_t *
 274 lnet_find_lnd_by_type (int type)
 275 {
 276         lnd_t         *lnd;
 277         struct list_head         *tmp;
 278
 279         /* holding lnd mutex */
 280         list_for_each (tmp, &the_lnet.ln_lnds) {
 281                 lnd = list_entry(tmp, lnd_t, lnd_list);
 282
 283                 if ((int)lnd->lnd_type == type)
 284                         return lnd;
 285         }
 286
 287         return NULL;
 288 }
 289
 290 void
 291 lnet_register_lnd (lnd_t *lnd)
 292 {
 293         LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
 294
 295         LASSERT (the_lnet.ln_init);
 296         LASSERT (libcfs_isknown_lnd(lnd->lnd_type));
 297         LASSERT (lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 298
 299         list_add_tail (&lnd->lnd_list, &the_lnet.ln_lnds);
 300         lnd->lnd_refcount = 0;
 301
 302         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 303
 304         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
 305 }
 306 EXPORT_SYMBOL(lnet_register_lnd);
 307
 308 void
 309 lnet_unregister_lnd (lnd_t *lnd)
 310 {
 311         LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
 312
 313         LASSERT (the_lnet.ln_init);
 314         LASSERT (lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 315         LASSERT (lnd->lnd_refcount == 0);
 316
 317         list_del (&lnd->lnd_list);
 318         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 319
 320         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
 321 }
 322 EXPORT_SYMBOL(lnet_unregister_lnd);
 323
 324 void
 325 lnet_counters_get(lnet_counters_t *counters)
 326 {
 327         lnet_counters_t *ctr;
 328         int             i;
 329
 330         memset(counters, 0, sizeof(*counters));
 331
 332         lnet_net_lock(LNET_LOCK_EX);
 333
 334         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 335                 counters->msgs_max     += ctr->msgs_max;
 336                 counters->msgs_alloc   += ctr->msgs_alloc;
 337                 counters->errors       += ctr->errors;
 338                 counters->send_count   += ctr->send_count;
 339                 counters->recv_count   += ctr->recv_count;
 340                 counters->route_count  += ctr->route_count;
 341                 counters->drop_count   += ctr->drop_count;
 342                 counters->send_length  += ctr->send_length;
 343                 counters->recv_length  += ctr->recv_length;
 344                 counters->route_length += ctr->route_length;
 345                 counters->drop_length  += ctr->drop_length;
 346
 347         }
 348         lnet_net_unlock(LNET_LOCK_EX);
 349 }
 350 EXPORT_SYMBOL(lnet_counters_get);
 351
 352 void
 353 lnet_counters_reset(void)
 354 {
 355         lnet_counters_t *counters;
 356         int             i;
 357
 358         lnet_net_lock(LNET_LOCK_EX);
 359
 360         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
 361                 memset(counters, 0, sizeof(lnet_counters_t));
 362
 363         lnet_net_unlock(LNET_LOCK_EX);
 364 }
 365 EXPORT_SYMBOL(lnet_counters_reset);
 366
 367 #ifdef LNET_USE_LIB_FREELIST
 368
 369 int
 370 lnet_freelist_init (lnet_freelist_t *fl, int n, int size)
 371 {
 372         char *space;
 373
 374         LASSERT (n > 0);
 375
 376         size += offsetof (lnet_freeobj_t, fo_contents);
 377
 378         LIBCFS_ALLOC(space, n * size);
 379         if (space == NULL)
 380                 return -ENOMEM;
 381
 382         INIT_LIST_HEAD (&fl->fl_list);
 383         fl->fl_objs = space;
 384         fl->fl_nobjs = n;
 385         fl->fl_objsize = size;
 386
 387         do {
 388                 memset (space, 0, size);
 389                 list_add ((struct list_head *)space, &fl->fl_list);
 390                 space += size;
 391         } while (--n != 0);
 392
 393         return 0;
 394 }
 395
 396 void
 397 lnet_freelist_fini (lnet_freelist_t *fl)
 398 {
 399         struct list_head       *el;
 400         int            count;
 401
 402         if (fl->fl_nobjs == 0)
 403                 return;
 404
 405         count = 0;
 406         for (el = fl->fl_list.next; el != &fl->fl_list; el = el->next)
 407                 count++;
 408
 409         LASSERT (count == fl->fl_nobjs);
 410
 411         LIBCFS_FREE(fl->fl_objs, fl->fl_nobjs * fl->fl_objsize);
 412         memset (fl, 0, sizeof (*fl));
 413 }
 414
 415 #endif /* LNET_USE_LIB_FREELIST */
 416
 417 static __u64
 418 lnet_create_interface_cookie (void)
 419 {
 420         /* NB the interface cookie in wire handles guards against delayed
 421          * replies and ACKs appearing valid after reboot. Initialisation time,
 422          * even if it's only implemented to millisecond resolution is probably
 423          * easily good enough. */
 424         struct timeval tv;
 425         __u64     cookie;
 426         do_gettimeofday(&tv);
 427         cookie = tv.tv_sec;
 428         cookie *= 1000000;
 429         cookie += tv.tv_usec;
 430         return cookie;
 431 }
 432
 433 static char *
 434 lnet_res_type2str(int type)
 435 {
 436         switch (type) {
 437         default:
 438                 LBUG();
 439         case LNET_COOKIE_TYPE_MD:
 440                 return "MD";
 441         case LNET_COOKIE_TYPE_ME:
 442                 return "ME";
 443         case LNET_COOKIE_TYPE_EQ:
 444                 return "EQ";
 445         }
 446 }
 447
 448 static void
 449 lnet_res_container_cleanup(struct lnet_res_container *rec)
 450 {
 451         int     count = 0;
 452
 453         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
 454                 return;
 455
 456         while (!list_empty(&rec->rec_active)) {
 457                 struct list_head *e = rec->rec_active.next;
 458
 459                 list_del_init(e);
 460                 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
 461                         lnet_eq_free(list_entry(e, lnet_eq_t, eq_list));
 462
 463                 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
 464                         lnet_md_free(list_entry(e, lnet_libmd_t, md_list));
 465
 466                 } else { /* NB: Active MEs should be attached on portals */
 467                         LBUG();
 468                 }
 469                 count++;
 470         }
 471
 472         if (count > 0) {
 473                 /* Found alive MD/ME/EQ, user really should unlink/free
 474                  * all of them before finalize LNet, but if someone didn't,
 475                  * we have to recycle garbage for him */
 476                 CERROR("%d active elements on exit of %s container\n",
 477                        count, lnet_res_type2str(rec->rec_type));
 478         }
 479
 480 #ifdef LNET_USE_LIB_FREELIST
 481         lnet_freelist_fini(&rec->rec_freelist);
 482 #endif
 483         if (rec->rec_lh_hash != NULL) {
 484                 LIBCFS_FREE(rec->rec_lh_hash,
 485                             LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 486                 rec->rec_lh_hash = NULL;
 487         }
 488
 489         rec->rec_type = 0; /* mark it as finalized */
 490 }
 491
 492 static int
 493 lnet_res_container_setup(struct lnet_res_container *rec,
 494                          int cpt, int type, int objnum, int objsz)
 495 {
 496         int     rc = 0;
 497         int     i;
 498
 499         LASSERT(rec->rec_type == 0);
 500
 501         rec->rec_type = type;
 502         INIT_LIST_HEAD(&rec->rec_active);
 503
 504 #ifdef LNET_USE_LIB_FREELIST
 505         memset(&rec->rec_freelist, 0, sizeof(rec->rec_freelist));
 506         rc = lnet_freelist_init(&rec->rec_freelist, objnum, objsz);
 507         if (rc != 0)
 508                 goto out;
 509 #endif
 510         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
 511
 512         /* Arbitrary choice of hash table size */
 513         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
 514                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 515         if (rec->rec_lh_hash == NULL) {
 516                 rc = -ENOMEM;
 517                 goto out;
 518         }
 519
 520         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
 521                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
 522
 523         return 0;
 524
 525 out:
 526         CERROR("Failed to setup %s resource container\n",
 527                lnet_res_type2str(type));
 528         lnet_res_container_cleanup(rec);
 529         return rc;
 530 }
 531
 532 static void
 533 lnet_res_containers_destroy(struct lnet_res_container **recs)
 534 {
 535         struct lnet_res_container       *rec;
 536         int                             i;
 537
 538         cfs_percpt_for_each(rec, i, recs)
 539                 lnet_res_container_cleanup(rec);
 540
 541         cfs_percpt_free(recs);
 542 }
 543
 544 static struct lnet_res_container **
 545 lnet_res_containers_create(int type, int objnum, int objsz)
 546 {
 547         struct lnet_res_container       **recs;
 548         struct lnet_res_container       *rec;
 549         int                             rc;
 550         int                             i;
 551
 552         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
 553         if (recs == NULL) {
 554                 CERROR("Failed to allocate %s resource containers\n",
 555                        lnet_res_type2str(type));
 556                 return NULL;
 557         }
 558
 559         cfs_percpt_for_each(rec, i, recs) {
 560                 rc = lnet_res_container_setup(rec, i, type, objnum, objsz);
 561                 if (rc != 0) {
 562                         lnet_res_containers_destroy(recs);
 563                         return NULL;
 564                 }
 565         }
 566
 567         return recs;
 568 }
 569
 570 lnet_libhandle_t *
 571 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
 572 {
 573         /* ALWAYS called with lnet_res_lock held */
 574         struct list_head                *head;
 575         lnet_libhandle_t        *lh;
 576         unsigned int            hash;
 577
 578         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
 579                 return NULL;
 580
 581         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
 582         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
 583
 584         list_for_each_entry(lh, head, lh_hash_chain) {
 585                 if (lh->lh_cookie == cookie)
 586                         return lh;
 587         }
 588
 589         return NULL;
 590 }
 591
 592 void
 593 lnet_res_lh_initialize(struct lnet_res_container *rec, lnet_libhandle_t *lh)
 594 {
 595         /* ALWAYS called with lnet_res_lock held */
 596         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
 597         unsigned int    hash;
 598
 599         lh->lh_cookie = rec->rec_lh_cookie;
 600         rec->rec_lh_cookie += 1 << ibits;
 601
 602         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
 603
 604         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
 605 }
 606
 607
 608 int lnet_unprepare(void);
 609
 610 static int
 611 lnet_prepare(lnet_pid_t requested_pid)
 612 {
 613         /* Prepare to bring up the network */
 614         struct lnet_res_container **recs;
 615         int                       rc = 0;
 616
 617         LASSERT (the_lnet.ln_refcount == 0);
 618
 619         the_lnet.ln_routing = 0;
 620
 621         LASSERT ((requested_pid & LNET_PID_USERFLAG) == 0);
 622         the_lnet.ln_pid = requested_pid;
 623
 624         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
 625         INIT_LIST_HEAD(&the_lnet.ln_nis);
 626         INIT_LIST_HEAD(&the_lnet.ln_nis_cpt);
 627         INIT_LIST_HEAD(&the_lnet.ln_nis_zombie);
 628         INIT_LIST_HEAD(&the_lnet.ln_routers);
 629
 630         rc = lnet_create_remote_nets_table();
 631         if (rc != 0)
 632                 goto failed;
 633
 634         the_lnet.ln_interface_cookie = lnet_create_interface_cookie();
 635
 636         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
 637                                                 sizeof(lnet_counters_t));
 638         if (the_lnet.ln_counters == NULL) {
 639                 CERROR("Failed to allocate counters for LNet\n");
 640                 rc = -ENOMEM;
 641                 goto failed;
 642         }
 643
 644         rc = lnet_peer_tables_create();
 645         if (rc != 0)
 646                 goto failed;
 647
 648         rc = lnet_msg_containers_create();
 649         if (rc != 0)
 650                 goto failed;
 651
 652         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
 653                                       LNET_COOKIE_TYPE_EQ, LNET_FL_MAX_EQS,
 654                                       sizeof(lnet_eq_t));
 655         if (rc != 0)
 656                 goto failed;
 657
 658         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME, LNET_FL_MAX_MES,
 659                                           sizeof(lnet_me_t));
 660         if (recs == NULL)
 661                 goto failed;
 662
 663         the_lnet.ln_me_containers = recs;
 664
 665         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD, LNET_FL_MAX_MDS,
 666                                           sizeof(lnet_libmd_t));
 667         if (recs == NULL)
 668                 goto failed;
 669
 670         the_lnet.ln_md_containers = recs;
 671
 672         rc = lnet_portals_create();
 673         if (rc != 0) {
 674                 CERROR("Failed to create portals for LNet: %d\n", rc);
 675                 goto failed;
 676         }
 677
 678         return 0;
 679
 680  failed:
 681         lnet_unprepare();
 682         return rc;
 683 }
 684
 685 int
 686 lnet_unprepare (void)
 687 {
 688         /* NB no LNET_LOCK since this is the last reference.  All LND instances
 689          * have shut down already, so it is safe to unlink and free all
 690          * descriptors, even those that appear committed to a network op (eg MD
 691          * with non-zero pending count) */
 692
 693         lnet_fail_nid(LNET_NID_ANY, 0);
 694
 695         LASSERT(the_lnet.ln_refcount == 0);
 696         LASSERT(list_empty(&the_lnet.ln_test_peers));
 697         LASSERT(list_empty(&the_lnet.ln_nis));
 698         LASSERT(list_empty(&the_lnet.ln_nis_cpt));
 699         LASSERT(list_empty(&the_lnet.ln_nis_zombie));
 700
 701         lnet_portals_destroy();
 702
 703         if (the_lnet.ln_md_containers != NULL) {
 704                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
 705                 the_lnet.ln_md_containers = NULL;
 706         }
 707
 708         if (the_lnet.ln_me_containers != NULL) {
 709                 lnet_res_containers_destroy(the_lnet.ln_me_containers);
 710                 the_lnet.ln_me_containers = NULL;
 711         }
 712
 713         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
 714
 715         lnet_msg_containers_destroy();
 716         lnet_peer_tables_destroy();
 717         lnet_rtrpools_free();
 718
 719         if (the_lnet.ln_counters != NULL) {
 720                 cfs_percpt_free(the_lnet.ln_counters);
 721                 the_lnet.ln_counters = NULL;
 722         }
 723         lnet_destroy_remote_nets_table();
 724
 725         return 0;
 726 }
 727
 728 lnet_ni_t  *
 729 lnet_net2ni_locked(__u32 net, int cpt)
 730 {
 731         struct list_head        *tmp;
 732         lnet_ni_t       *ni;
 733
 734         LASSERT(cpt != LNET_LOCK_EX);
 735
 736         list_for_each(tmp, &the_lnet.ln_nis) {
 737                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 738
 739                 if (LNET_NIDNET(ni->ni_nid) == net) {
 740                         lnet_ni_addref_locked(ni, cpt);
 741                         return ni;
 742                 }
 743         }
 744
 745         return NULL;
 746 }
 747
 748 lnet_ni_t *
 749 lnet_net2ni(__u32 net)
 750 {
 751         lnet_ni_t *ni;
 752
 753         lnet_net_lock(0);
 754         ni = lnet_net2ni_locked(net, 0);
 755         lnet_net_unlock(0);
 756
 757         return ni;
 758 }
 759 EXPORT_SYMBOL(lnet_net2ni);
 760
 761 static unsigned int
 762 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
 763 {
 764         __u64           key = nid;
 765         unsigned int    val;
 766
 767         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
 768
 769         if (number == 1)
 770                 return 0;
 771
 772         val = hash_long(key, LNET_CPT_BITS);
 773         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
 774         if (val < number)
 775                 return val;
 776
 777         return (unsigned int)(key + val + (val >> 1)) % number;
 778 }
 779
 780 int
 781 lnet_cpt_of_nid_locked(lnet_nid_t nid)
 782 {
 783         struct lnet_ni *ni;
 784
 785         /* must called with hold of lnet_net_lock */
 786         if (LNET_CPT_NUMBER == 1)
 787                 return 0; /* the only one */
 788
 789         /* take lnet_net_lock(any) would be OK */
 790         if (!list_empty(&the_lnet.ln_nis_cpt)) {
 791                 list_for_each_entry(ni, &the_lnet.ln_nis_cpt, ni_cptlist) {
 792                         if (LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid))
 793                                 continue;
 794
 795                         LASSERT(ni->ni_cpts != NULL);
 796                         return ni->ni_cpts[lnet_nid_cpt_hash
 797                                            (nid, ni->ni_ncpts)];
 798                 }
 799         }
 800
 801         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 802 }
 803
 804 int
 805 lnet_cpt_of_nid(lnet_nid_t nid)
 806 {
 807         int     cpt;
 808         int     cpt2;
 809
 810         if (LNET_CPT_NUMBER == 1)
 811                 return 0; /* the only one */
 812
 813         if (list_empty(&the_lnet.ln_nis_cpt))
 814                 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 815
 816         cpt = lnet_net_lock_current();
 817         cpt2 = lnet_cpt_of_nid_locked(nid);
 818         lnet_net_unlock(cpt);
 819
 820         return cpt2;
 821 }
 822 EXPORT_SYMBOL(lnet_cpt_of_nid);
 823
 824 int
 825 lnet_islocalnet(__u32 net)
 826 {
 827         struct lnet_ni  *ni;
 828         int             cpt;
 829
 830         cpt = lnet_net_lock_current();
 831
 832         ni = lnet_net2ni_locked(net, cpt);
 833         if (ni != NULL)
 834                 lnet_ni_decref_locked(ni, cpt);
 835
 836         lnet_net_unlock(cpt);
 837
 838         return ni != NULL;
 839 }
 840
 841 lnet_ni_t  *
 842 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
 843 {
 844         struct lnet_ni  *ni;
 845         struct list_head        *tmp;
 846
 847         LASSERT(cpt != LNET_LOCK_EX);
 848
 849         list_for_each(tmp, &the_lnet.ln_nis) {
 850                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 851
 852                 if (ni->ni_nid == nid) {
 853                         lnet_ni_addref_locked(ni, cpt);
 854                         return ni;
 855                 }
 856         }
 857
 858         return NULL;
 859 }
 860
 861 int
 862 lnet_islocalnid(lnet_nid_t nid)
 863 {
 864         struct lnet_ni  *ni;
 865         int             cpt;
 866
 867         cpt = lnet_net_lock_current();
 868         ni = lnet_nid2ni_locked(nid, cpt);
 869         if (ni != NULL)
 870                 lnet_ni_decref_locked(ni, cpt);
 871         lnet_net_unlock(cpt);
 872
 873         return ni != NULL;
 874 }
 875
 876 int
 877 lnet_count_acceptor_nis (void)
 878 {
 879         /* Return the # of NIs that need the acceptor. */
 880         int             count = 0;
 881         struct list_head        *tmp;
 882         struct lnet_ni  *ni;
 883         int             cpt;
 884
 885         cpt = lnet_net_lock_current();
 886         list_for_each(tmp, &the_lnet.ln_nis) {
 887                 ni = list_entry(tmp, lnet_ni_t, ni_list);
 888
 889                 if (ni->ni_lnd->lnd_accept != NULL)
 890                         count++;
 891         }
 892
 893         lnet_net_unlock(cpt);
 894
 895         return count;
 896 }
 897
 898 static int
 899 lnet_ni_tq_credits(lnet_ni_t *ni)
 900 {
 901         int     credits;
 902
 903         LASSERT(ni->ni_ncpts >= 1);
 904
 905         if (ni->ni_ncpts == 1)
 906                 return ni->ni_maxtxcredits;
 907
 908         credits = ni->ni_maxtxcredits / ni->ni_ncpts;
 909         credits = max(credits, 8 * ni->ni_peertxcredits);
 910         credits = min(credits, ni->ni_maxtxcredits);
 911
 912         return credits;
 913 }
 914
 915 static void
 916 lnet_shutdown_lndnis (void)
 917 {
 918         int             i;
 919         int             islo;
 920         lnet_ni_t        *ni;
 921
 922         /* NB called holding the global mutex */
 923
 924         /* All quiet on the API front */
 925         LASSERT(!the_lnet.ln_shutdown);
 926         LASSERT(the_lnet.ln_refcount == 0);
 927         LASSERT(list_empty(&the_lnet.ln_nis_zombie));
 928
 929         lnet_net_lock(LNET_LOCK_EX);
 930         the_lnet.ln_shutdown = 1;       /* flag shutdown */
 931
 932         /* Unlink NIs from the global table */
 933         while (!list_empty(&the_lnet.ln_nis)) {
 934                 ni = list_entry(the_lnet.ln_nis.next,
 935                                     lnet_ni_t, ni_list);
 936                 /* move it to zombie list and nobody can find it anymore */
 937                 list_move(&ni->ni_list, &the_lnet.ln_nis_zombie);
 938                 lnet_ni_decref_locked(ni, 0);   /* drop ln_nis' ref */
 939
 940                 if (!list_empty(&ni->ni_cptlist)) {
 941                         list_del_init(&ni->ni_cptlist);
 942                         lnet_ni_decref_locked(ni, 0);
 943                 }
 944         }
 945
 946         /* Drop the cached eqwait NI. */
 947         if (the_lnet.ln_eq_waitni != NULL) {
 948                 lnet_ni_decref_locked(the_lnet.ln_eq_waitni, 0);
 949                 the_lnet.ln_eq_waitni = NULL;
 950         }
 951
 952         /* Drop the cached loopback NI. */
 953         if (the_lnet.ln_loni != NULL) {
 954                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
 955                 the_lnet.ln_loni = NULL;
 956         }
 957
 958         lnet_net_unlock(LNET_LOCK_EX);
 959
 960         /* Clear lazy portals and drop delayed messages which hold refs
 961          * on their lnet_msg_t::msg_rxpeer */
 962         for (i = 0; i < the_lnet.ln_nportals; i++)
 963                 LNetClearLazyPortal(i);
 964
 965         /* Clear the peer table and wait for all peers to go (they hold refs on
 966          * their NIs) */
 967         lnet_peer_tables_cleanup();
 968
 969         lnet_net_lock(LNET_LOCK_EX);
 970         /* Now wait for the NI's I just nuked to show up on ln_zombie_nis
 971          * and shut them down in guaranteed thread context */
 972         i = 2;
 973         while (!list_empty(&the_lnet.ln_nis_zombie)) {
 974                 int     *ref;
 975                 int     j;
 976
 977                 ni = list_entry(the_lnet.ln_nis_zombie.next,
 978                                     lnet_ni_t, ni_list);
 979                 list_del_init(&ni->ni_list);
 980                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
 981                         if (*ref == 0)
 982                                 continue;
 983                         /* still busy, add it back to zombie list */
 984                         list_add(&ni->ni_list, &the_lnet.ln_nis_zombie);
 985                         break;
 986                 }
 987
 988                 if (!list_empty(&ni->ni_list)) {
 989                         lnet_net_unlock(LNET_LOCK_EX);
 990                         ++i;
 991                         if ((i & (-i)) == i) {
 992                                 CDEBUG(D_WARNING, "Waiting for zombie LNI %s\n",
 993                                        libcfs_nid2str(ni->ni_nid));
 994                         }
 995                         set_current_state(TASK_UNINTERRUPTIBLE);
 996                         schedule_timeout(cfs_time_seconds(1));
 997                         lnet_net_lock(LNET_LOCK_EX);
 998                         continue;
 999                 }
1000
1001                 ni->ni_lnd->lnd_refcount--;
1002                 lnet_net_unlock(LNET_LOCK_EX);
1003
1004                 islo = ni->ni_lnd->lnd_type == LOLND;
1005
1006                 LASSERT (!in_interrupt ());
1007                 (ni->ni_lnd->lnd_shutdown)(ni);
1008
1009                 /* can't deref lnd anymore now; it might have unregistered
1010                  * itself...  */
1011
1012                 if (!islo)
1013                         CDEBUG(D_LNI, "Removed LNI %s\n",
1014                                libcfs_nid2str(ni->ni_nid));
1015
1016                 lnet_ni_free(ni);
1017                 i = 2;
1018
1019                 lnet_net_lock(LNET_LOCK_EX);
1020         }
1021
1022         the_lnet.ln_shutdown = 0;
1023         lnet_net_unlock(LNET_LOCK_EX);
1024
1025         if (the_lnet.ln_network_tokens != NULL) {
1026                 LIBCFS_FREE(the_lnet.ln_network_tokens,
1027                             the_lnet.ln_network_tokens_nob);
1028                 the_lnet.ln_network_tokens = NULL;
1029         }
1030 }
1031
1032 static int
1033 lnet_startup_lndnis (void)
1034 {
1035         lnd_t                   *lnd;
1036         struct lnet_ni          *ni;
1037         struct lnet_tx_queue    *tq;
1038         struct list_head                nilist;
1039         int                     i;
1040         int             rc = 0;
1041         int             lnd_type;
1042         int             nicount = 0;
1043         char          *nets = lnet_get_networks();
1044
1045         INIT_LIST_HEAD(&nilist);
1046
1047         if (nets == NULL)
1048                 goto failed;
1049
1050         rc = lnet_parse_networks(&nilist, nets);
1051         if (rc != 0)
1052                 goto failed;
1053
1054         while (!list_empty(&nilist)) {
1055                 ni = list_entry(nilist.next, lnet_ni_t, ni_list);
1056                 lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
1057
1058                 LASSERT (libcfs_isknown_lnd(lnd_type));
1059
1060                 if (lnd_type == CIBLND    ||
1061                     lnd_type == OPENIBLND ||
1062                     lnd_type == IIBLND    ||
1063                     lnd_type == VIBLND) {
1064                         CERROR("LND %s obsoleted\n",
1065                                libcfs_lnd2str(lnd_type));
1066                         goto failed;
1067                 }
1068
1069                 LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1070                 lnd = lnet_find_lnd_by_type(lnd_type);
1071
1072                 if (lnd == NULL) {
1073                         LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1074                         rc = request_module("%s",
1075                                                 libcfs_lnd2modname(lnd_type));
1076                         LNET_MUTEX_LOCK(&the_lnet.ln_lnd_mutex);
1077
1078                         lnd = lnet_find_lnd_by_type(lnd_type);
1079                         if (lnd == NULL) {
1080                                 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1081                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
1082                                        libcfs_lnd2str(lnd_type),
1083                                        libcfs_lnd2modname(lnd_type), rc);
1084                                 goto failed;
1085                         }
1086                 }
1087
1088                 lnet_net_lock(LNET_LOCK_EX);
1089                 lnd->lnd_refcount++;
1090                 lnet_net_unlock(LNET_LOCK_EX);
1091
1092                 ni->ni_lnd = lnd;
1093
1094                 rc = (lnd->lnd_startup)(ni);
1095
1096                 LNET_MUTEX_UNLOCK(&the_lnet.ln_lnd_mutex);
1097
1098                 if (rc != 0) {
1099                         LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s"
1100                                            "\n",
1101                                            rc, libcfs_lnd2str(lnd->lnd_type));
1102                         lnet_net_lock(LNET_LOCK_EX);
1103                         lnd->lnd_refcount--;
1104                         lnet_net_unlock(LNET_LOCK_EX);
1105                         goto failed;
1106                 }
1107
1108                 LASSERT (ni->ni_peertimeout <= 0 || lnd->lnd_query != NULL);
1109
1110                 list_del(&ni->ni_list);
1111
1112                 lnet_net_lock(LNET_LOCK_EX);
1113                 /* refcount for ln_nis */
1114                 lnet_ni_addref_locked(ni, 0);
1115                 list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1116                 if (ni->ni_cpts != NULL) {
1117                         list_add_tail(&ni->ni_cptlist,
1118                                           &the_lnet.ln_nis_cpt);
1119                         lnet_ni_addref_locked(ni, 0);
1120                 }
1121
1122                 lnet_net_unlock(LNET_LOCK_EX);
1123
1124                 if (lnd->lnd_type == LOLND) {
1125                         lnet_ni_addref(ni);
1126                         LASSERT (the_lnet.ln_loni == NULL);
1127                         the_lnet.ln_loni = ni;
1128                         continue;
1129                 }
1130
1131                 if (ni->ni_peertxcredits == 0 ||
1132                     ni->ni_maxtxcredits == 0) {
1133                         LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1134                                            libcfs_lnd2str(lnd->lnd_type),
1135                                            ni->ni_peertxcredits == 0 ?
1136                                            "" : "per-peer ");
1137                         goto failed;
1138                 }
1139
1140                 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1141                         tq->tq_credits_min =
1142                         tq->tq_credits_max =
1143                         tq->tq_credits = lnet_ni_tq_credits(ni);
1144                 }
1145
1146                 CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1147                        libcfs_nid2str(ni->ni_nid), ni->ni_peertxcredits,
1148                        lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1149                        ni->ni_peerrtrcredits, ni->ni_peertimeout);
1150
1151                 nicount++;
1152         }
1153
1154         if (the_lnet.ln_eq_waitni != NULL && nicount > 1) {
1155                 lnd_type = the_lnet.ln_eq_waitni->ni_lnd->lnd_type;
1156                 LCONSOLE_ERROR_MSG(0x109, "LND %s can only run single-network"
1157                                    "\n",
1158                                    libcfs_lnd2str(lnd_type));
1159                 goto failed;
1160         }
1161
1162         return 0;
1163
1164  failed:
1165         lnet_shutdown_lndnis();
1166
1167         while (!list_empty(&nilist)) {
1168                 ni = list_entry(nilist.next, lnet_ni_t, ni_list);
1169                 list_del(&ni->ni_list);
1170                 lnet_ni_free(ni);
1171         }
1172
1173         return -ENETDOWN;
1174 }
1175
1176 /**
1177  * Initialize LNet library.
1178  *
1179  * Only userspace program needs to call this function - it's automatically
1180  * called in the kernel at module loading time. Caller has to call LNetFini()
1181  * after a call to LNetInit(), if and only if the latter returned 0. It must
1182  * be called exactly once.
1183  *
1184  * \return 0 on success, and -ve on failures.
1185  */
1186 int
1187 LNetInit(void)
1188 {
1189         int     rc;
1190
1191         lnet_assert_wire_constants();
1192         LASSERT(!the_lnet.ln_init);
1193
1194         memset(&the_lnet, 0, sizeof(the_lnet));
1195
1196         /* refer to global cfs_cpt_table for now */
1197         the_lnet.ln_cpt_table   = cfs_cpt_table;
1198         the_lnet.ln_cpt_number  = cfs_cpt_number(cfs_cpt_table);
1199
1200         LASSERT(the_lnet.ln_cpt_number > 0);
1201         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1202                 /* we are under risk of consuming all lh_cookie */
1203                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
1204                        "please change setting of CPT-table and retry\n",
1205                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
1206                 return -1;
1207         }
1208
1209         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1210                 the_lnet.ln_cpt_bits++;
1211
1212         rc = lnet_create_locks();
1213         if (rc != 0) {
1214                 CERROR("Can't create LNet global locks: %d\n", rc);
1215                 return -1;
1216         }
1217
1218         the_lnet.ln_refcount = 0;
1219         the_lnet.ln_init = 1;
1220         LNetInvalidateHandle(&the_lnet.ln_rc_eqh);
1221         INIT_LIST_HEAD(&the_lnet.ln_lnds);
1222         INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1223         INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1224
1225         /* The hash table size is the number of bits it takes to express the set
1226          * ln_num_routes, minus 1 (better to under estimate than over so we
1227          * don't waste memory). */
1228         if (rnet_htable_size <= 0)
1229                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
1230         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
1231                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
1232         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
1233                                            order_base_2(rnet_htable_size) - 1);
1234
1235         /* All LNDs apart from the LOLND are in separate modules.  They
1236          * register themselves when their module loads, and unregister
1237          * themselves when their module is unloaded. */
1238         lnet_register_lnd(&the_lolnd);
1239         return 0;
1240 }
1241 EXPORT_SYMBOL(LNetInit);
1242
1243 /**
1244  * Finalize LNet library.
1245  *
1246  * Only userspace program needs to call this function. It can be called
1247  * at most once.
1248  *
1249  * \pre LNetInit() called with success.
1250  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1251  */
1252 void
1253 LNetFini(void)
1254 {
1255         LASSERT(the_lnet.ln_init);
1256         LASSERT(the_lnet.ln_refcount == 0);
1257
1258         while (!list_empty(&the_lnet.ln_lnds))
1259                 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1260                                                    lnd_t, lnd_list));
1261         lnet_destroy_locks();
1262
1263         the_lnet.ln_init = 0;
1264 }
1265 EXPORT_SYMBOL(LNetFini);
1266
1267 /**
1268  * Set LNet PID and start LNet interfaces, routing, and forwarding.
1269  *
1270  * Userspace program should call this after a successful call to LNetInit().
1271  * Users must call this function at least once before any other functions.
1272  * For each successful call there must be a corresponding call to
1273  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1274  * ignored.
1275  *
1276  * The PID used by LNet may be different from the one requested.
1277  * See LNetGetId().
1278  *
1279  * \param requested_pid PID requested by the caller.
1280  *
1281  * \return >= 0 on success, and < 0 error code on failures.
1282  */
1283 int
1284 LNetNIInit(lnet_pid_t requested_pid)
1285 {
1286         int      im_a_router = 0;
1287         int      rc;
1288
1289         LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1290
1291         LASSERT (the_lnet.ln_init);
1292         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1293
1294         if (the_lnet.ln_refcount > 0) {
1295                 rc = the_lnet.ln_refcount++;
1296                 goto out;
1297         }
1298
1299         lnet_get_tunables();
1300
1301         if (requested_pid == LNET_PID_ANY) {
1302                 /* Don't instantiate LNET just for me */
1303                 rc = -ENETDOWN;
1304                 goto failed0;
1305         }
1306
1307         rc = lnet_prepare(requested_pid);
1308         if (rc != 0)
1309                 goto failed0;
1310
1311         rc = lnet_startup_lndnis();
1312         if (rc != 0)
1313                 goto failed1;
1314
1315         rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1316         if (rc != 0)
1317                 goto failed2;
1318
1319         rc = lnet_check_routes();
1320         if (rc != 0)
1321                 goto failed2;
1322
1323         rc = lnet_rtrpools_alloc(im_a_router);
1324         if (rc != 0)
1325                 goto failed2;
1326
1327         rc = lnet_acceptor_start();
1328         if (rc != 0)
1329                 goto failed2;
1330
1331         the_lnet.ln_refcount = 1;
1332         /* Now I may use my own API functions... */
1333
1334         /* NB router checker needs the_lnet.ln_ping_info in
1335          * lnet_router_checker -> lnet_update_ni_status_locked */
1336         rc = lnet_ping_target_init();
1337         if (rc != 0)
1338                 goto failed3;
1339
1340         rc = lnet_router_checker_start();
1341         if (rc != 0)
1342                 goto failed4;
1343
1344         lnet_proc_init();
1345         goto out;
1346
1347  failed4:
1348         lnet_ping_target_fini();
1349  failed3:
1350         the_lnet.ln_refcount = 0;
1351         lnet_acceptor_stop();
1352  failed2:
1353         lnet_destroy_routes();
1354         lnet_shutdown_lndnis();
1355  failed1:
1356         lnet_unprepare();
1357  failed0:
1358         LASSERT (rc < 0);
1359  out:
1360         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1361         return rc;
1362 }
1363 EXPORT_SYMBOL(LNetNIInit);
1364
1365 /**
1366  * Stop LNet interfaces, routing, and forwarding.
1367  *
1368  * Users must call this function once for each successful call to LNetNIInit().
1369  * Once the LNetNIFini() operation has been started, the results of pending
1370  * API operations are undefined.
1371  *
1372  * \return always 0 for current implementation.
1373  */
1374 int
1375 LNetNIFini(void)
1376 {
1377         LNET_MUTEX_LOCK(&the_lnet.ln_api_mutex);
1378
1379         LASSERT (the_lnet.ln_init);
1380         LASSERT (the_lnet.ln_refcount > 0);
1381
1382         if (the_lnet.ln_refcount != 1) {
1383                 the_lnet.ln_refcount--;
1384         } else {
1385                 LASSERT (!the_lnet.ln_niinit_self);
1386
1387                 lnet_proc_fini();
1388                 lnet_router_checker_stop();
1389                 lnet_ping_target_fini();
1390
1391                 /* Teardown fns that use my own API functions BEFORE here */
1392                 the_lnet.ln_refcount = 0;
1393
1394                 lnet_acceptor_stop();
1395                 lnet_destroy_routes();
1396                 lnet_shutdown_lndnis();
1397                 lnet_unprepare();
1398         }
1399
1400         LNET_MUTEX_UNLOCK(&the_lnet.ln_api_mutex);
1401         return 0;
1402 }
1403 EXPORT_SYMBOL(LNetNIFini);
1404
1405 /**
1406  * This is an ugly hack to export IOC_LIBCFS_DEBUG_PEER and
1407  * IOC_LIBCFS_PORTALS_COMPATIBILITY commands to users, by tweaking the LNet
1408  * internal ioctl handler.
1409  *
1410  * IOC_LIBCFS_PORTALS_COMPATIBILITY is now deprecated, don't use it.
1411  *
1412  * \param cmd IOC_LIBCFS_DEBUG_PEER to print debugging data about a peer.
1413  * The data will be printed to system console. Don't use it excessively.
1414  * \param arg A pointer to lnet_process_id_t, process ID of the peer.
1415  *
1416  * \return Always return 0 when called by users directly (i.e., not via ioctl).
1417  */
1418 int
1419 LNetCtl(unsigned int cmd, void *arg)
1420 {
1421         struct libcfs_ioctl_data *data = arg;
1422         lnet_process_id_t        id = {0};
1423         lnet_ni_t               *ni;
1424         int                    rc;
1425
1426         LASSERT (the_lnet.ln_init);
1427         LASSERT (the_lnet.ln_refcount > 0);
1428
1429         switch (cmd) {
1430         case IOC_LIBCFS_GET_NI:
1431                 rc = LNetGetId(data->ioc_count, &id);
1432                 data->ioc_nid = id.nid;
1433                 return rc;
1434
1435         case IOC_LIBCFS_FAIL_NID:
1436                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1437
1438         case IOC_LIBCFS_ADD_ROUTE:
1439                 rc = lnet_add_route(data->ioc_net, data->ioc_count,
1440                                     data->ioc_nid, data->ioc_priority);
1441                 return (rc != 0) ? rc : lnet_check_routes();
1442
1443         case IOC_LIBCFS_DEL_ROUTE:
1444                 return lnet_del_route(data->ioc_net, data->ioc_nid);
1445
1446         case IOC_LIBCFS_GET_ROUTE:
1447                 return lnet_get_route(data->ioc_count,
1448                                       &data->ioc_net, &data->ioc_count,
1449                                       &data->ioc_nid, &data->ioc_flags,
1450                                       &data->ioc_priority);
1451         case IOC_LIBCFS_NOTIFY_ROUTER:
1452                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
1453                                    cfs_time_current() -
1454                                    cfs_time_seconds(get_seconds() -
1455                                                     (time_t)data->ioc_u64[0]));
1456
1457         case IOC_LIBCFS_PORTALS_COMPATIBILITY:
1458                 /* This can be removed once lustre stops calling it */
1459                 return 0;
1460
1461         case IOC_LIBCFS_LNET_DIST:
1462                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
1463                 if (rc < 0 && rc != -EHOSTUNREACH)
1464                         return rc;
1465
1466                 data->ioc_u32[0] = rc;
1467                 return 0;
1468
1469         case IOC_LIBCFS_TESTPROTOCOMPAT:
1470                 lnet_net_lock(LNET_LOCK_EX);
1471                 the_lnet.ln_testprotocompat = data->ioc_flags;
1472                 lnet_net_unlock(LNET_LOCK_EX);
1473                 return 0;
1474
1475         case IOC_LIBCFS_PING:
1476                 id.nid = data->ioc_nid;
1477                 id.pid = data->ioc_u32[0];
1478                 rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
1479                                (lnet_process_id_t *)data->ioc_pbuf1,
1480                                data->ioc_plen1/sizeof(lnet_process_id_t));
1481                 if (rc < 0)
1482                         return rc;
1483                 data->ioc_count = rc;
1484                 return 0;
1485
1486         case IOC_LIBCFS_DEBUG_PEER: {
1487                 /* CAVEAT EMPTOR: this one designed for calling directly; not
1488                  * via an ioctl */
1489                 id = *((lnet_process_id_t *) arg);
1490
1491                 lnet_debug_peer(id.nid);
1492
1493                 ni = lnet_net2ni(LNET_NIDNET(id.nid));
1494                 if (ni == NULL) {
1495                         CDEBUG(D_WARNING, "No NI for %s\n", libcfs_id2str(id));
1496                 } else {
1497                         if (ni->ni_lnd->lnd_ctl == NULL) {
1498                                 CDEBUG(D_WARNING, "No ctl for %s\n",
1499                                        libcfs_id2str(id));
1500                         } else {
1501                                 (void)ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1502                         }
1503
1504                         lnet_ni_decref(ni);
1505                 }
1506                 return 0;
1507         }
1508
1509         default:
1510                 ni = lnet_net2ni(data->ioc_net);
1511                 if (ni == NULL)
1512                         return -EINVAL;
1513
1514                 if (ni->ni_lnd->lnd_ctl == NULL)
1515                         rc = -EINVAL;
1516                 else
1517                         rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
1518
1519                 lnet_ni_decref(ni);
1520                 return rc;
1521         }
1522         /* not reached */
1523 }
1524 EXPORT_SYMBOL(LNetCtl);
1525
1526 /**
1527  * Retrieve the lnet_process_id_t ID of LNet interface at \a index. Note that
1528  * all interfaces share a same PID, as requested by LNetNIInit().
1529  *
1530  * \param index Index of the interface to look up.
1531  * \param id On successful return, this location will hold the
1532  * lnet_process_id_t ID of the interface.
1533  *
1534  * \retval 0 If an interface exists at \a index.
1535  * \retval -ENOENT If no interface has been found.
1536  */
1537 int
1538 LNetGetId(unsigned int index, lnet_process_id_t *id)
1539 {
1540         struct lnet_ni  *ni;
1541         struct list_head        *tmp;
1542         int             cpt;
1543         int             rc = -ENOENT;
1544
1545         LASSERT(the_lnet.ln_init);
1546
1547         /* LNetNI initilization failed? */
1548         if (the_lnet.ln_refcount == 0)
1549                 return rc;
1550
1551         cpt = lnet_net_lock_current();
1552
1553         list_for_each(tmp, &the_lnet.ln_nis) {
1554                 if (index-- != 0)
1555                         continue;
1556
1557                 ni = list_entry(tmp, lnet_ni_t, ni_list);
1558
1559                 id->nid = ni->ni_nid;
1560                 id->pid = the_lnet.ln_pid;
1561                 rc = 0;
1562                 break;
1563         }
1564
1565         lnet_net_unlock(cpt);
1566         return rc;
1567 }
1568 EXPORT_SYMBOL(LNetGetId);
1569
1570 /**
1571  * Print a string representation of handle \a h into buffer \a str of
1572  * \a len bytes.
1573  */
1574 void
1575 LNetSnprintHandle(char *str, int len, lnet_handle_any_t h)
1576 {
1577         snprintf(str, len, "%#llx", h.cookie);
1578 }
1579 EXPORT_SYMBOL(LNetSnprintHandle);
1580
1581 static int
1582 lnet_create_ping_info(void)
1583 {
1584         int            i;
1585         int            n;
1586         int            rc;
1587         unsigned int      infosz;
1588         lnet_ni_t       *ni;
1589         lnet_process_id_t id;
1590         lnet_ping_info_t *pinfo;
1591
1592         for (n = 0; ; n++) {
1593                 rc = LNetGetId(n, &id);
1594                 if (rc == -ENOENT)
1595                         break;
1596
1597                 LASSERT (rc == 0);
1598         }
1599
1600         infosz = offsetof(lnet_ping_info_t, pi_ni[n]);
1601         LIBCFS_ALLOC(pinfo, infosz);
1602         if (pinfo == NULL) {
1603                 CERROR("Can't allocate ping info[%d]\n", n);
1604                 return -ENOMEM;
1605         }
1606
1607         pinfo->pi_nnis    = n;
1608         pinfo->pi_pid     = the_lnet.ln_pid;
1609         pinfo->pi_magic   = LNET_PROTO_PING_MAGIC;
1610         pinfo->pi_features = LNET_PING_FEAT_NI_STATUS;
1611
1612         for (i = 0; i < n; i++) {
1613                 lnet_ni_status_t *ns = &pinfo->pi_ni[i];
1614
1615                 rc = LNetGetId(i, &id);
1616                 LASSERT (rc == 0);
1617
1618                 ns->ns_nid    = id.nid;
1619                 ns->ns_status = LNET_NI_STATUS_UP;
1620
1621                 lnet_net_lock(0);
1622
1623                 ni = lnet_nid2ni_locked(id.nid, 0);
1624                 LASSERT(ni != NULL);
1625
1626                 lnet_ni_lock(ni);
1627                 LASSERT(ni->ni_status == NULL);
1628                 ni->ni_status = ns;
1629                 lnet_ni_unlock(ni);
1630
1631                 lnet_ni_decref_locked(ni, 0);
1632                 lnet_net_unlock(0);
1633         }
1634
1635         the_lnet.ln_ping_info = pinfo;
1636         return 0;
1637 }
1638
1639 static void
1640 lnet_destroy_ping_info(void)
1641 {
1642         struct lnet_ni  *ni;
1643
1644         lnet_net_lock(0);
1645
1646         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
1647                 lnet_ni_lock(ni);
1648                 ni->ni_status = NULL;
1649                 lnet_ni_unlock(ni);
1650         }
1651
1652         lnet_net_unlock(0);
1653
1654         LIBCFS_FREE(the_lnet.ln_ping_info,
1655                     offsetof(lnet_ping_info_t,
1656                              pi_ni[the_lnet.ln_ping_info->pi_nnis]));
1657         the_lnet.ln_ping_info = NULL;
1658         return;
1659 }
1660
1661 int
1662 lnet_ping_target_init(void)
1663 {
1664         lnet_md_t        md = { NULL };
1665         lnet_handle_me_t  meh;
1666         lnet_process_id_t id;
1667         int            rc;
1668         int            rc2;
1669         int            infosz;
1670
1671         rc = lnet_create_ping_info();
1672         if (rc != 0)
1673                 return rc;
1674
1675         /* We can have a tiny EQ since we only need to see the unlink event on
1676          * teardown, which by definition is the last one! */
1677         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &the_lnet.ln_ping_target_eq);
1678         if (rc != 0) {
1679                 CERROR("Can't allocate ping EQ: %d\n", rc);
1680                 goto failed_0;
1681         }
1682
1683         memset(&id, 0, sizeof(lnet_process_id_t));
1684         id.nid = LNET_NID_ANY;
1685         id.pid = LNET_PID_ANY;
1686
1687         rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1688                           LNET_PROTO_PING_MATCHBITS, 0,
1689                           LNET_UNLINK, LNET_INS_AFTER,
1690                           &meh);
1691         if (rc != 0) {
1692                 CERROR("Can't create ping ME: %d\n", rc);
1693                 goto failed_1;
1694         }
1695
1696         /* initialize md content */
1697         infosz = offsetof(lnet_ping_info_t,
1698                           pi_ni[the_lnet.ln_ping_info->pi_nnis]);
1699         md.start     = the_lnet.ln_ping_info;
1700         md.length    = infosz;
1701         md.threshold = LNET_MD_THRESH_INF;
1702         md.max_size  = 0;
1703         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1704                        LNET_MD_MANAGE_REMOTE;
1705         md.user_ptr  = NULL;
1706         md.eq_handle = the_lnet.ln_ping_target_eq;
1707
1708         rc = LNetMDAttach(meh, md,
1709                           LNET_RETAIN,
1710                           &the_lnet.ln_ping_target_md);
1711         if (rc != 0) {
1712                 CERROR("Can't attach ping MD: %d\n", rc);
1713                 goto failed_2;
1714         }
1715
1716         return 0;
1717
1718  failed_2:
1719         rc2 = LNetMEUnlink(meh);
1720         LASSERT (rc2 == 0);
1721  failed_1:
1722         rc2 = LNetEQFree(the_lnet.ln_ping_target_eq);
1723         LASSERT (rc2 == 0);
1724  failed_0:
1725         lnet_destroy_ping_info();
1726         return rc;
1727 }
1728
1729 void
1730 lnet_ping_target_fini(void)
1731 {
1732         lnet_event_t    event;
1733         int          rc;
1734         int          which;
1735         int          timeout_ms = 1000;
1736         sigset_t    blocked = cfs_block_allsigs();
1737
1738         LNetMDUnlink(the_lnet.ln_ping_target_md);
1739         /* NB md could be busy; this just starts the unlink */
1740
1741         for (;;) {
1742                 rc = LNetEQPoll(&the_lnet.ln_ping_target_eq, 1,
1743                                 timeout_ms, &event, &which);
1744
1745                 /* I expect overflow... */
1746                 LASSERT (rc >= 0 || rc == -EOVERFLOW);
1747
1748                 if (rc == 0) {
1749                         /* timed out: provide a diagnostic */
1750                         CWARN("Still waiting for ping MD to unlink\n");
1751                         timeout_ms *= 2;
1752                         continue;
1753                 }
1754
1755                 /* Got a valid event */
1756                 if (event.unlinked)
1757                         break;
1758         }
1759
1760         rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1761         LASSERT (rc == 0);
1762         lnet_destroy_ping_info();
1763         cfs_restore_sigs(blocked);
1764 }
1765
1766 int
1767 lnet_ping (lnet_process_id_t id, int timeout_ms, lnet_process_id_t *ids, int n_ids)
1768 {
1769         lnet_handle_eq_t     eqh;
1770         lnet_handle_md_t     mdh;
1771         lnet_event_t     event;
1772         lnet_md_t           md = { NULL };
1773         int               which;
1774         int               unlinked = 0;
1775         int               replied = 0;
1776         const int           a_long_time = 60000; /* mS */
1777         int               infosz = offsetof(lnet_ping_info_t, pi_ni[n_ids]);
1778         lnet_ping_info_t    *info;
1779         lnet_process_id_t    tmpid;
1780         int               i;
1781         int               nob;
1782         int               rc;
1783         int               rc2;
1784         sigset_t         blocked;
1785
1786         if (n_ids <= 0 ||
1787             id.nid == LNET_NID_ANY ||
1788             timeout_ms > 500000 ||            /* arbitrary limit! */
1789             n_ids > 20)                  /* arbitrary limit! */
1790                 return -EINVAL;
1791
1792         if (id.pid == LNET_PID_ANY)
1793                 id.pid = LUSTRE_SRV_LNET_PID;
1794
1795         LIBCFS_ALLOC(info, infosz);
1796         if (info == NULL)
1797                 return -ENOMEM;
1798
1799         /* NB 2 events max (including any unlink event) */
1800         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
1801         if (rc != 0) {
1802                 CERROR("Can't allocate EQ: %d\n", rc);
1803                 goto out_0;
1804         }
1805
1806         /* initialize md content */
1807         md.start     = info;
1808         md.length    = infosz;
1809         md.threshold = 2; /*GET/REPLY*/
1810         md.max_size  = 0;
1811         md.options   = LNET_MD_TRUNCATE;
1812         md.user_ptr  = NULL;
1813         md.eq_handle = eqh;
1814
1815         rc = LNetMDBind(md, LNET_UNLINK, &mdh);
1816         if (rc != 0) {
1817                 CERROR("Can't bind MD: %d\n", rc);
1818                 goto out_1;
1819         }
1820
1821         rc = LNetGet(LNET_NID_ANY, mdh, id,
1822                      LNET_RESERVED_PORTAL,
1823                      LNET_PROTO_PING_MATCHBITS, 0);
1824
1825         if (rc != 0) {
1826                 /* Don't CERROR; this could be deliberate! */
1827
1828                 rc2 = LNetMDUnlink(mdh);
1829                 LASSERT (rc2 == 0);
1830
1831                 /* NB must wait for the UNLINK event below... */
1832                 unlinked = 1;
1833                 timeout_ms = a_long_time;
1834         }
1835
1836         do {
1837                 /* MUST block for unlink to complete */
1838                 if (unlinked)
1839                         blocked = cfs_block_allsigs();
1840
1841                 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
1842
1843                 if (unlinked)
1844                         cfs_restore_sigs(blocked);
1845
1846                 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
1847                        (rc2 <= 0) ? -1 : event.type,
1848                        (rc2 <= 0) ? -1 : event.status,
1849                        (rc2 > 0 && event.unlinked) ? " unlinked" : "");
1850
1851                 LASSERT (rc2 != -EOVERFLOW);     /* can't miss anything */
1852
1853                 if (rc2 <= 0 || event.status != 0) {
1854                         /* timeout or error */
1855                         if (!replied && rc == 0)
1856                                 rc = (rc2 < 0) ? rc2 :
1857                                      (rc2 == 0) ? -ETIMEDOUT :
1858                                      event.status;
1859
1860                         if (!unlinked) {
1861                                 /* Ensure completion in finite time... */
1862                                 LNetMDUnlink(mdh);
1863                                 /* No assertion (racing with network) */
1864                                 unlinked = 1;
1865                                 timeout_ms = a_long_time;
1866                         } else if (rc2 == 0) {
1867                                 /* timed out waiting for unlink */
1868                                 CWARN("ping %s: late network completion\n",
1869                                       libcfs_id2str(id));
1870                         }
1871                 } else if (event.type == LNET_EVENT_REPLY) {
1872                         replied = 1;
1873                         rc = event.mlength;
1874                 }
1875
1876         } while (rc2 <= 0 || !event.unlinked);
1877
1878         if (!replied) {
1879                 if (rc >= 0)
1880                         CWARN("%s: Unexpected rc >= 0 but no reply!\n",
1881                               libcfs_id2str(id));
1882                 rc = -EIO;
1883                 goto out_1;
1884         }
1885
1886         nob = rc;
1887         LASSERT (nob >= 0 && nob <= infosz);
1888
1889         rc = -EPROTO;                      /* if I can't parse... */
1890
1891         if (nob < 8) {
1892                 /* can't check magic/version */
1893                 CERROR("%s: ping info too short %d\n",
1894                        libcfs_id2str(id), nob);
1895                 goto out_1;
1896         }
1897
1898         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
1899                 lnet_swap_pinginfo(info);
1900         } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
1901                 CERROR("%s: Unexpected magic %08x\n",
1902                        libcfs_id2str(id), info->pi_magic);
1903                 goto out_1;
1904         }
1905
1906         if ((info->pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
1907                 CERROR("%s: ping w/o NI status: 0x%x\n",
1908                        libcfs_id2str(id), info->pi_features);
1909                 goto out_1;
1910         }
1911
1912         if (nob < offsetof(lnet_ping_info_t, pi_ni[0])) {
1913                 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
1914                        nob, (int)offsetof(lnet_ping_info_t, pi_ni[0]));
1915                 goto out_1;
1916         }
1917
1918         if (info->pi_nnis < n_ids)
1919                 n_ids = info->pi_nnis;
1920
1921         if (nob < offsetof(lnet_ping_info_t, pi_ni[n_ids])) {
1922                 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
1923                        nob, (int)offsetof(lnet_ping_info_t, pi_ni[n_ids]));
1924                 goto out_1;
1925         }
1926
1927         rc = -EFAULT;                      /* If I SEGV... */
1928
1929         memset(&tmpid, 0, sizeof(tmpid));
1930         for (i = 0; i < n_ids; i++) {
1931                 tmpid.pid = info->pi_pid;
1932                 tmpid.nid = info->pi_ni[i].ns_nid;
1933                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
1934                         goto out_1;
1935         }
1936         rc = info->pi_nnis;
1937
1938  out_1:
1939         rc2 = LNetEQFree(eqh);
1940         if (rc2 != 0)
1941                 CERROR("rc2 %d\n", rc2);
1942         LASSERT (rc2 == 0);
1943
1944  out_0:
1945         LIBCFS_FREE(info, infosz);
1946         return rc;
1947 }