lnet/lnet/api-ni.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2016, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_LNET
  34 #include <linux/log2.h>
  35 #include <linux/ktime.h>
  36
  37 #include <lnet/lib-lnet.h>
  38
  39 #define D_LNI D_CONSOLE
  40
  41 struct lnet the_lnet;           /* THE state of the network */
  42 EXPORT_SYMBOL(the_lnet);
  43
  44 static char *ip2nets = "";
  45 module_param(ip2nets, charp, 0444);
  46 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
  47
  48 static char *networks = "";
  49 module_param(networks, charp, 0444);
  50 MODULE_PARM_DESC(networks, "local networks");
  51
  52 static char *routes = "";
  53 module_param(routes, charp, 0444);
  54 MODULE_PARM_DESC(routes, "routes to non-local networks");
  55
  56 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
  57 module_param(rnet_htable_size, int, 0444);
  58 MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
  59
  60 static int use_tcp_bonding = false;
  61 module_param(use_tcp_bonding, int, 0444);
  62 MODULE_PARM_DESC(use_tcp_bonding,
  63                  "Set to 1 to use socklnd bonding. 0 to use Multi-Rail");
  64
  65 unsigned int lnet_numa_range = 0;
  66 module_param(lnet_numa_range, uint, 0444);
  67 MODULE_PARM_DESC(lnet_numa_range,
  68                 "NUMA range to consider during Multi-Rail selection");
  69
  70 /*
  71  * This sequence number keeps track of how many times DLC was used to
  72  * update the local NIs. It is incremented when a NI is added or
  73  * removed and checked when sending a message to determine if there is
  74  * a need to re-run the selection algorithm. See lnet_select_pathway()
  75  * for more details on its usage.
  76  */
  77 static atomic_t lnet_dlc_seq_no = ATOMIC_INIT(0);
  78
  79 static int lnet_ping(struct lnet_process_id id, signed long timeout,
  80                      struct lnet_process_id __user *ids, int n_ids);
  81
  82 static char *
  83 lnet_get_routes(void)
  84 {
  85         return routes;
  86 }
  87
  88 static char *
  89 lnet_get_networks(void)
  90 {
  91         char   *nets;
  92         int     rc;
  93
  94         if (*networks != 0 && *ip2nets != 0) {
  95                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or "
  96                                    "'ip2nets' but not both at once\n");
  97                 return NULL;
  98         }
  99
 100         if (*ip2nets != 0) {
 101                 rc = lnet_parse_ip2nets(&nets, ip2nets);
 102                 return (rc == 0) ? nets : NULL;
 103         }
 104
 105         if (*networks != 0)
 106                 return networks;
 107
 108         return "tcp";
 109 }
 110
 111 static void
 112 lnet_init_locks(void)
 113 {
 114         spin_lock_init(&the_lnet.ln_eq_wait_lock);
 115         init_waitqueue_head(&the_lnet.ln_eq_waitq);
 116         init_waitqueue_head(&the_lnet.ln_rc_waitq);
 117         mutex_init(&the_lnet.ln_lnd_mutex);
 118         mutex_init(&the_lnet.ln_api_mutex);
 119 }
 120
 121 static void
 122 lnet_fini_locks(void)
 123 {
 124 }
 125
 126 struct kmem_cache *lnet_mes_cachep;        /* MEs kmem_cache */
 127 struct kmem_cache *lnet_small_mds_cachep;  /* <= LNET_SMALL_MD_SIZE bytes
 128                                             *  MDs kmem_cache */
 129
 130 static int
 131 lnet_descriptor_setup(void)
 132 {
 133         /* create specific kmem_cache for MEs and small MDs (i.e., originally
 134          * allocated in <size-xxx> kmem_cache).
 135          */
 136         lnet_mes_cachep = kmem_cache_create("lnet_MEs", sizeof(struct lnet_me),
 137                                             0, 0, NULL);
 138         if (!lnet_mes_cachep)
 139                 return -ENOMEM;
 140
 141         lnet_small_mds_cachep = kmem_cache_create("lnet_small_MDs",
 142                                                   LNET_SMALL_MD_SIZE, 0, 0,
 143                                                   NULL);
 144         if (!lnet_small_mds_cachep)
 145                 return -ENOMEM;
 146
 147         return 0;
 148 }
 149
 150 static void
 151 lnet_descriptor_cleanup(void)
 152 {
 153
 154         if (lnet_small_mds_cachep) {
 155                 kmem_cache_destroy(lnet_small_mds_cachep);
 156                 lnet_small_mds_cachep = NULL;
 157         }
 158
 159         if (lnet_mes_cachep) {
 160                 kmem_cache_destroy(lnet_mes_cachep);
 161                 lnet_mes_cachep = NULL;
 162         }
 163 }
 164
 165 static int
 166 lnet_create_remote_nets_table(void)
 167 {
 168         int               i;
 169         struct list_head *hash;
 170
 171         LASSERT(the_lnet.ln_remote_nets_hash == NULL);
 172         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 173         LIBCFS_ALLOC(hash, LNET_REMOTE_NETS_HASH_SIZE * sizeof(*hash));
 174         if (hash == NULL) {
 175                 CERROR("Failed to create remote nets hash table\n");
 176                 return -ENOMEM;
 177         }
 178
 179         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 180                 INIT_LIST_HEAD(&hash[i]);
 181         the_lnet.ln_remote_nets_hash = hash;
 182         return 0;
 183 }
 184
 185 static void
 186 lnet_destroy_remote_nets_table(void)
 187 {
 188         int i;
 189
 190         if (the_lnet.ln_remote_nets_hash == NULL)
 191                 return;
 192
 193         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 194                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 195
 196         LIBCFS_FREE(the_lnet.ln_remote_nets_hash,
 197                     LNET_REMOTE_NETS_HASH_SIZE *
 198                     sizeof(the_lnet.ln_remote_nets_hash[0]));
 199         the_lnet.ln_remote_nets_hash = NULL;
 200 }
 201
 202 static void
 203 lnet_destroy_locks(void)
 204 {
 205         if (the_lnet.ln_res_lock != NULL) {
 206                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 207                 the_lnet.ln_res_lock = NULL;
 208         }
 209
 210         if (the_lnet.ln_net_lock != NULL) {
 211                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 212                 the_lnet.ln_net_lock = NULL;
 213         }
 214
 215         lnet_fini_locks();
 216 }
 217
 218 static int
 219 lnet_create_locks(void)
 220 {
 221         lnet_init_locks();
 222
 223         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 224         if (the_lnet.ln_res_lock == NULL)
 225                 goto failed;
 226
 227         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 228         if (the_lnet.ln_net_lock == NULL)
 229                 goto failed;
 230
 231         return 0;
 232
 233  failed:
 234         lnet_destroy_locks();
 235         return -ENOMEM;
 236 }
 237
 238 static void lnet_assert_wire_constants(void)
 239 {
 240         /* Wire protocol assertions generated by 'wirecheck'
 241          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 242          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 243          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7) */
 244
 245         /* Constants... */
 246         CLASSERT(LNET_PROTO_TCP_MAGIC == 0xeebc0ded);
 247         CLASSERT(LNET_PROTO_TCP_VERSION_MAJOR == 1);
 248         CLASSERT(LNET_PROTO_TCP_VERSION_MINOR == 0);
 249         CLASSERT(LNET_MSG_ACK == 0);
 250         CLASSERT(LNET_MSG_PUT == 1);
 251         CLASSERT(LNET_MSG_GET == 2);
 252         CLASSERT(LNET_MSG_REPLY == 3);
 253         CLASSERT(LNET_MSG_HELLO == 4);
 254
 255         /* Checks for struct lnet_handle_wire */
 256         CLASSERT((int)sizeof(struct lnet_handle_wire) == 16);
 257         CLASSERT((int)offsetof(struct lnet_handle_wire, wh_interface_cookie) == 0);
 258         CLASSERT((int)sizeof(((struct lnet_handle_wire *)0)->wh_interface_cookie) == 8);
 259         CLASSERT((int)offsetof(struct lnet_handle_wire, wh_object_cookie) == 8);
 260         CLASSERT((int)sizeof(((struct lnet_handle_wire *)0)->wh_object_cookie) == 8);
 261
 262         /* Checks for struct struct lnet_magicversion */
 263         CLASSERT((int)sizeof(struct lnet_magicversion) == 8);
 264         CLASSERT((int)offsetof(struct lnet_magicversion, magic) == 0);
 265         CLASSERT((int)sizeof(((struct lnet_magicversion *)0)->magic) == 4);
 266         CLASSERT((int)offsetof(struct lnet_magicversion, version_major) == 4);
 267         CLASSERT((int)sizeof(((struct lnet_magicversion *)0)->version_major) == 2);
 268         CLASSERT((int)offsetof(struct lnet_magicversion, version_minor) == 6);
 269         CLASSERT((int)sizeof(((struct lnet_magicversion *)0)->version_minor) == 2);
 270
 271         /* Checks for struct struct lnet_hdr */
 272         CLASSERT((int)sizeof(struct lnet_hdr) == 72);
 273         CLASSERT((int)offsetof(struct lnet_hdr, dest_nid) == 0);
 274         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->dest_nid) == 8);
 275         CLASSERT((int)offsetof(struct lnet_hdr, src_nid) == 8);
 276         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->src_nid) == 8);
 277         CLASSERT((int)offsetof(struct lnet_hdr, dest_pid) == 16);
 278         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->dest_pid) == 4);
 279         CLASSERT((int)offsetof(struct lnet_hdr, src_pid) == 20);
 280         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->src_pid) == 4);
 281         CLASSERT((int)offsetof(struct lnet_hdr, type) == 24);
 282         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->type) == 4);
 283         CLASSERT((int)offsetof(struct lnet_hdr, payload_length) == 28);
 284         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->payload_length) == 4);
 285         CLASSERT((int)offsetof(struct lnet_hdr, msg) == 32);
 286         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg) == 40);
 287
 288         /* Ack */
 289         CLASSERT((int)offsetof(struct lnet_hdr, msg.ack.dst_wmd) == 32);
 290         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.ack.dst_wmd) == 16);
 291         CLASSERT((int)offsetof(struct lnet_hdr, msg.ack.match_bits) == 48);
 292         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.ack.match_bits) == 8);
 293         CLASSERT((int)offsetof(struct lnet_hdr, msg.ack.mlength) == 56);
 294         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.ack.mlength) == 4);
 295
 296         /* Put */
 297         CLASSERT((int)offsetof(struct lnet_hdr, msg.put.ack_wmd) == 32);
 298         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.put.ack_wmd) == 16);
 299         CLASSERT((int)offsetof(struct lnet_hdr, msg.put.match_bits) == 48);
 300         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.put.match_bits) == 8);
 301         CLASSERT((int)offsetof(struct lnet_hdr, msg.put.hdr_data) == 56);
 302         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.put.hdr_data) == 8);
 303         CLASSERT((int)offsetof(struct lnet_hdr, msg.put.ptl_index) == 64);
 304         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.put.ptl_index) == 4);
 305         CLASSERT((int)offsetof(struct lnet_hdr, msg.put.offset) == 68);
 306         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.put.offset) == 4);
 307
 308         /* Get */
 309         CLASSERT((int)offsetof(struct lnet_hdr, msg.get.return_wmd) == 32);
 310         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.get.return_wmd) == 16);
 311         CLASSERT((int)offsetof(struct lnet_hdr, msg.get.match_bits) == 48);
 312         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.get.match_bits) == 8);
 313         CLASSERT((int)offsetof(struct lnet_hdr, msg.get.ptl_index) == 56);
 314         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.get.ptl_index) == 4);
 315         CLASSERT((int)offsetof(struct lnet_hdr, msg.get.src_offset) == 60);
 316         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.get.src_offset) == 4);
 317         CLASSERT((int)offsetof(struct lnet_hdr, msg.get.sink_length) == 64);
 318         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.get.sink_length) == 4);
 319
 320         /* Reply */
 321         CLASSERT((int)offsetof(struct lnet_hdr, msg.reply.dst_wmd) == 32);
 322         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.reply.dst_wmd) == 16);
 323
 324         /* Hello */
 325         CLASSERT((int)offsetof(struct lnet_hdr, msg.hello.incarnation) == 32);
 326         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.hello.incarnation) == 8);
 327         CLASSERT((int)offsetof(struct lnet_hdr, msg.hello.type) == 40);
 328         CLASSERT((int)sizeof(((struct lnet_hdr *)0)->msg.hello.type) == 4);
 329 }
 330
 331 static struct lnet_lnd *lnet_find_lnd_by_type(__u32 type)
 332 {
 333         struct lnet_lnd *lnd;
 334         struct list_head *tmp;
 335
 336         /* holding lnd mutex */
 337         list_for_each(tmp, &the_lnet.ln_lnds) {
 338                 lnd = list_entry(tmp, struct lnet_lnd, lnd_list);
 339
 340                 if (lnd->lnd_type == type)
 341                         return lnd;
 342         }
 343         return NULL;
 344 }
 345
 346 void
 347 lnet_register_lnd(struct lnet_lnd *lnd)
 348 {
 349         mutex_lock(&the_lnet.ln_lnd_mutex);
 350
 351         LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
 352         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == NULL);
 353
 354         list_add_tail(&lnd->lnd_list, &the_lnet.ln_lnds);
 355         lnd->lnd_refcount = 0;
 356
 357         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 358
 359         mutex_unlock(&the_lnet.ln_lnd_mutex);
 360 }
 361 EXPORT_SYMBOL(lnet_register_lnd);
 362
 363 void
 364 lnet_unregister_lnd(struct lnet_lnd *lnd)
 365 {
 366         mutex_lock(&the_lnet.ln_lnd_mutex);
 367
 368         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 369         LASSERT(lnd->lnd_refcount == 0);
 370
 371         list_del(&lnd->lnd_list);
 372         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 373
 374         mutex_unlock(&the_lnet.ln_lnd_mutex);
 375 }
 376 EXPORT_SYMBOL(lnet_unregister_lnd);
 377
 378 void
 379 lnet_counters_get(struct lnet_counters *counters)
 380 {
 381         struct lnet_counters *ctr;
 382         int             i;
 383
 384         memset(counters, 0, sizeof(*counters));
 385
 386         lnet_net_lock(LNET_LOCK_EX);
 387
 388         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 389                 counters->msgs_max     += ctr->msgs_max;
 390                 counters->msgs_alloc   += ctr->msgs_alloc;
 391                 counters->errors       += ctr->errors;
 392                 counters->send_count   += ctr->send_count;
 393                 counters->recv_count   += ctr->recv_count;
 394                 counters->route_count  += ctr->route_count;
 395                 counters->drop_count   += ctr->drop_count;
 396                 counters->send_length  += ctr->send_length;
 397                 counters->recv_length  += ctr->recv_length;
 398                 counters->route_length += ctr->route_length;
 399                 counters->drop_length  += ctr->drop_length;
 400
 401         }
 402         lnet_net_unlock(LNET_LOCK_EX);
 403 }
 404 EXPORT_SYMBOL(lnet_counters_get);
 405
 406 void
 407 lnet_counters_reset(void)
 408 {
 409         struct lnet_counters *counters;
 410         int             i;
 411
 412         lnet_net_lock(LNET_LOCK_EX);
 413
 414         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
 415                 memset(counters, 0, sizeof(struct lnet_counters));
 416
 417         lnet_net_unlock(LNET_LOCK_EX);
 418 }
 419
 420 static char *
 421 lnet_res_type2str(int type)
 422 {
 423         switch (type) {
 424         default:
 425                 LBUG();
 426         case LNET_COOKIE_TYPE_MD:
 427                 return "MD";
 428         case LNET_COOKIE_TYPE_ME:
 429                 return "ME";
 430         case LNET_COOKIE_TYPE_EQ:
 431                 return "EQ";
 432         }
 433 }
 434
 435 static void
 436 lnet_res_container_cleanup(struct lnet_res_container *rec)
 437 {
 438         int     count = 0;
 439
 440         if (rec->rec_type == 0) /* not set yet, it's uninitialized */
 441                 return;
 442
 443         while (!list_empty(&rec->rec_active)) {
 444                 struct list_head *e = rec->rec_active.next;
 445
 446                 list_del_init(e);
 447                 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
 448                         lnet_eq_free(list_entry(e, struct lnet_eq, eq_list));
 449
 450                 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
 451                         lnet_md_free(list_entry(e, struct lnet_libmd, md_list));
 452
 453                 } else { /* NB: Active MEs should be attached on portals */
 454                         LBUG();
 455                 }
 456                 count++;
 457         }
 458
 459         if (count > 0) {
 460                 /* Found alive MD/ME/EQ, user really should unlink/free
 461                  * all of them before finalize LNet, but if someone didn't,
 462                  * we have to recycle garbage for him */
 463                 CERROR("%d active elements on exit of %s container\n",
 464                        count, lnet_res_type2str(rec->rec_type));
 465         }
 466
 467         if (rec->rec_lh_hash != NULL) {
 468                 LIBCFS_FREE(rec->rec_lh_hash,
 469                             LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 470                 rec->rec_lh_hash = NULL;
 471         }
 472
 473         rec->rec_type = 0; /* mark it as finalized */
 474 }
 475
 476 static int
 477 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
 478 {
 479         int     rc = 0;
 480         int     i;
 481
 482         LASSERT(rec->rec_type == 0);
 483
 484         rec->rec_type = type;
 485         INIT_LIST_HEAD(&rec->rec_active);
 486
 487         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
 488
 489         /* Arbitrary choice of hash table size */
 490         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
 491                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 492         if (rec->rec_lh_hash == NULL) {
 493                 rc = -ENOMEM;
 494                 goto out;
 495         }
 496
 497         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
 498                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
 499
 500         return 0;
 501
 502 out:
 503         CERROR("Failed to setup %s resource container\n",
 504                lnet_res_type2str(type));
 505         lnet_res_container_cleanup(rec);
 506         return rc;
 507 }
 508
 509 static void
 510 lnet_res_containers_destroy(struct lnet_res_container **recs)
 511 {
 512         struct lnet_res_container       *rec;
 513         int                             i;
 514
 515         cfs_percpt_for_each(rec, i, recs)
 516                 lnet_res_container_cleanup(rec);
 517
 518         cfs_percpt_free(recs);
 519 }
 520
 521 static struct lnet_res_container **
 522 lnet_res_containers_create(int type)
 523 {
 524         struct lnet_res_container       **recs;
 525         struct lnet_res_container       *rec;
 526         int                             rc;
 527         int                             i;
 528
 529         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
 530         if (recs == NULL) {
 531                 CERROR("Failed to allocate %s resource containers\n",
 532                        lnet_res_type2str(type));
 533                 return NULL;
 534         }
 535
 536         cfs_percpt_for_each(rec, i, recs) {
 537                 rc = lnet_res_container_setup(rec, i, type);
 538                 if (rc != 0) {
 539                         lnet_res_containers_destroy(recs);
 540                         return NULL;
 541                 }
 542         }
 543
 544         return recs;
 545 }
 546
 547 struct lnet_libhandle *
 548 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
 549 {
 550         /* ALWAYS called with lnet_res_lock held */
 551         struct list_head        *head;
 552         struct lnet_libhandle   *lh;
 553         unsigned int            hash;
 554
 555         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
 556                 return NULL;
 557
 558         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
 559         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
 560
 561         list_for_each_entry(lh, head, lh_hash_chain) {
 562                 if (lh->lh_cookie == cookie)
 563                         return lh;
 564         }
 565
 566         return NULL;
 567 }
 568
 569 void
 570 lnet_res_lh_initialize(struct lnet_res_container *rec,
 571                        struct lnet_libhandle *lh)
 572 {
 573         /* ALWAYS called with lnet_res_lock held */
 574         unsigned int    ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
 575         unsigned int    hash;
 576
 577         lh->lh_cookie = rec->rec_lh_cookie;
 578         rec->rec_lh_cookie += 1 << ibits;
 579
 580         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
 581
 582         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
 583 }
 584
 585 static int lnet_unprepare(void);
 586
 587 static int
 588 lnet_prepare(lnet_pid_t requested_pid)
 589 {
 590         /* Prepare to bring up the network */
 591         struct lnet_res_container **recs;
 592         int                       rc = 0;
 593
 594         if (requested_pid == LNET_PID_ANY) {
 595                 /* Don't instantiate LNET just for me */
 596                 return -ENETDOWN;
 597         }
 598
 599         LASSERT(the_lnet.ln_refcount == 0);
 600
 601         the_lnet.ln_routing = 0;
 602
 603         LASSERT((requested_pid & LNET_PID_USERFLAG) == 0);
 604         the_lnet.ln_pid = requested_pid;
 605
 606         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
 607         INIT_LIST_HEAD(&the_lnet.ln_peers);
 608         INIT_LIST_HEAD(&the_lnet.ln_remote_peer_ni_list);
 609         INIT_LIST_HEAD(&the_lnet.ln_nets);
 610         INIT_LIST_HEAD(&the_lnet.ln_routers);
 611         INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
 612         INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
 613
 614         rc = lnet_descriptor_setup();
 615         if (rc != 0)
 616                 goto failed;
 617
 618         rc = lnet_create_remote_nets_table();
 619         if (rc != 0)
 620                 goto failed;
 621
 622         /*
 623          * NB the interface cookie in wire handles guards against delayed
 624          * replies and ACKs appearing valid after reboot.
 625          */
 626         the_lnet.ln_interface_cookie = ktime_get_real_ns();
 627
 628         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
 629                                                 sizeof(struct lnet_counters));
 630         if (the_lnet.ln_counters == NULL) {
 631                 CERROR("Failed to allocate counters for LNet\n");
 632                 rc = -ENOMEM;
 633                 goto failed;
 634         }
 635
 636         rc = lnet_peer_tables_create();
 637         if (rc != 0)
 638                 goto failed;
 639
 640         rc = lnet_msg_containers_create();
 641         if (rc != 0)
 642                 goto failed;
 643
 644         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
 645                                       LNET_COOKIE_TYPE_EQ);
 646         if (rc != 0)
 647                 goto failed;
 648
 649         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME);
 650         if (recs == NULL) {
 651                 rc = -ENOMEM;
 652                 goto failed;
 653         }
 654
 655         the_lnet.ln_me_containers = recs;
 656
 657         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
 658         if (recs == NULL) {
 659                 rc = -ENOMEM;
 660                 goto failed;
 661         }
 662
 663         the_lnet.ln_md_containers = recs;
 664
 665         rc = lnet_portals_create();
 666         if (rc != 0) {
 667                 CERROR("Failed to create portals for LNet: %d\n", rc);
 668                 goto failed;
 669         }
 670
 671         return 0;
 672
 673  failed:
 674         lnet_unprepare();
 675         return rc;
 676 }
 677
 678 static int
 679 lnet_unprepare (void)
 680 {
 681         /* NB no LNET_LOCK since this is the last reference.  All LND instances
 682          * have shut down already, so it is safe to unlink and free all
 683          * descriptors, even those that appear committed to a network op (eg MD
 684          * with non-zero pending count) */
 685
 686         lnet_fail_nid(LNET_NID_ANY, 0);
 687
 688         LASSERT(the_lnet.ln_refcount == 0);
 689         LASSERT(list_empty(&the_lnet.ln_test_peers));
 690         LASSERT(list_empty(&the_lnet.ln_nets));
 691
 692         lnet_portals_destroy();
 693
 694         if (the_lnet.ln_md_containers != NULL) {
 695                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
 696                 the_lnet.ln_md_containers = NULL;
 697         }
 698
 699         if (the_lnet.ln_me_containers != NULL) {
 700                 lnet_res_containers_destroy(the_lnet.ln_me_containers);
 701                 the_lnet.ln_me_containers = NULL;
 702         }
 703
 704         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
 705
 706         lnet_msg_containers_destroy();
 707         lnet_peer_uninit();
 708         lnet_rtrpools_free(0);
 709
 710         if (the_lnet.ln_counters != NULL) {
 711                 cfs_percpt_free(the_lnet.ln_counters);
 712                 the_lnet.ln_counters = NULL;
 713         }
 714         lnet_destroy_remote_nets_table();
 715         lnet_descriptor_cleanup();
 716
 717         return 0;
 718 }
 719
 720 struct lnet_ni  *
 721 lnet_net2ni_locked(__u32 net_id, int cpt)
 722 {
 723         struct lnet_ni   *ni;
 724         struct lnet_net  *net;
 725
 726         LASSERT(cpt != LNET_LOCK_EX);
 727
 728         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 729                 if (net->net_id == net_id) {
 730                         ni = list_entry(net->net_ni_list.next, struct lnet_ni,
 731                                         ni_netlist);
 732                         return ni;
 733                 }
 734         }
 735
 736         return NULL;
 737 }
 738
 739 struct lnet_ni *
 740 lnet_net2ni_addref(__u32 net)
 741 {
 742         struct lnet_ni *ni;
 743
 744         lnet_net_lock(0);
 745         ni = lnet_net2ni_locked(net, 0);
 746         if (ni)
 747                 lnet_ni_addref_locked(ni, 0);
 748         lnet_net_unlock(0);
 749
 750         return ni;
 751 }
 752 EXPORT_SYMBOL(lnet_net2ni_addref);
 753
 754 struct lnet_net *
 755 lnet_get_net_locked(__u32 net_id)
 756 {
 757         struct lnet_net  *net;
 758
 759         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 760                 if (net->net_id == net_id)
 761                         return net;
 762         }
 763
 764         return NULL;
 765 }
 766
 767 unsigned int
 768 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
 769 {
 770         __u64           key = nid;
 771         unsigned int    val;
 772
 773         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
 774
 775         if (number == 1)
 776                 return 0;
 777
 778         val = hash_long(key, LNET_CPT_BITS);
 779         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
 780         if (val < number)
 781                 return val;
 782
 783         return (unsigned int)(key + val + (val >> 1)) % number;
 784 }
 785
 786 int
 787 lnet_cpt_of_nid_locked(lnet_nid_t nid, struct lnet_ni *ni)
 788 {
 789         struct lnet_net *net;
 790
 791         /* must called with hold of lnet_net_lock */
 792         if (LNET_CPT_NUMBER == 1)
 793                 return 0; /* the only one */
 794
 795         /*
 796          * If NI is provided then use the CPT identified in the NI cpt
 797          * list if one exists. If one doesn't exist, then that NI is
 798          * associated with all CPTs and it follows that the net it belongs
 799          * to is implicitly associated with all CPTs, so just hash the nid
 800          * and return that.
 801          */
 802         if (ni != NULL) {
 803                 if (ni->ni_cpts != NULL)
 804                         return ni->ni_cpts[lnet_nid_cpt_hash(nid,
 805                                                              ni->ni_ncpts)];
 806                 else
 807                         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 808         }
 809
 810         /* no NI provided so look at the net */
 811         net = lnet_get_net_locked(LNET_NIDNET(nid));
 812
 813         if (net != NULL && net->net_cpts != NULL) {
 814                 return net->net_cpts[lnet_nid_cpt_hash(nid, net->net_ncpts)];
 815         }
 816
 817         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 818 }
 819
 820 int
 821 lnet_cpt_of_nid(lnet_nid_t nid, struct lnet_ni *ni)
 822 {
 823         int     cpt;
 824         int     cpt2;
 825
 826         if (LNET_CPT_NUMBER == 1)
 827                 return 0; /* the only one */
 828
 829         cpt = lnet_net_lock_current();
 830
 831         cpt2 = lnet_cpt_of_nid_locked(nid, ni);
 832
 833         lnet_net_unlock(cpt);
 834
 835         return cpt2;
 836 }
 837 EXPORT_SYMBOL(lnet_cpt_of_nid);
 838
 839 int
 840 lnet_islocalnet(__u32 net_id)
 841 {
 842         struct lnet_net *net;
 843         int             cpt;
 844         bool            local;
 845
 846         cpt = lnet_net_lock_current();
 847
 848         net = lnet_get_net_locked(net_id);
 849
 850         local = net != NULL;
 851
 852         lnet_net_unlock(cpt);
 853
 854         return local;
 855 }
 856
 857 bool
 858 lnet_is_ni_healthy_locked(struct lnet_ni *ni)
 859 {
 860         if (ni->ni_state == LNET_NI_STATE_ACTIVE ||
 861             ni->ni_state == LNET_NI_STATE_DEGRADED)
 862                 return true;
 863
 864         return false;
 865 }
 866
 867 struct lnet_ni  *
 868 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
 869 {
 870         struct lnet_net  *net;
 871         struct lnet_ni   *ni;
 872
 873         LASSERT(cpt != LNET_LOCK_EX);
 874
 875         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 876                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 877                         if (ni->ni_nid == nid)
 878                                 return ni;
 879                 }
 880         }
 881
 882         return NULL;
 883 }
 884
 885 struct lnet_ni *
 886 lnet_nid2ni_addref(lnet_nid_t nid)
 887 {
 888         struct lnet_ni *ni;
 889
 890         lnet_net_lock(0);
 891         ni = lnet_nid2ni_locked(nid, 0);
 892         if (ni)
 893                 lnet_ni_addref_locked(ni, 0);
 894         lnet_net_unlock(0);
 895
 896         return ni;
 897 }
 898 EXPORT_SYMBOL(lnet_nid2ni_addref);
 899
 900 int
 901 lnet_islocalnid(lnet_nid_t nid)
 902 {
 903         struct lnet_ni  *ni;
 904         int             cpt;
 905
 906         cpt = lnet_net_lock_current();
 907         ni = lnet_nid2ni_locked(nid, cpt);
 908         lnet_net_unlock(cpt);
 909
 910         return ni != NULL;
 911 }
 912
 913 int
 914 lnet_count_acceptor_nets(void)
 915 {
 916         /* Return the # of NIs that need the acceptor. */
 917         int              count = 0;
 918         struct lnet_net  *net;
 919         int              cpt;
 920
 921         cpt = lnet_net_lock_current();
 922         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 923                 /* all socklnd type networks should have the acceptor
 924                  * thread started */
 925                 if (net->net_lnd->lnd_accept != NULL)
 926                         count++;
 927         }
 928
 929         lnet_net_unlock(cpt);
 930
 931         return count;
 932 }
 933
 934 static struct lnet_ping_info *
 935 lnet_ping_info_create(int num_ni)
 936 {
 937         struct lnet_ping_info *ping_info;
 938         unsigned int     infosz;
 939
 940         infosz = offsetof(struct lnet_ping_info, pi_ni[num_ni]);
 941         LIBCFS_ALLOC(ping_info, infosz);
 942         if (ping_info == NULL) {
 943                 CERROR("Can't allocate ping info[%d]\n", num_ni);
 944                 return NULL;
 945         }
 946
 947         ping_info->pi_nnis = num_ni;
 948         ping_info->pi_pid = the_lnet.ln_pid;
 949         ping_info->pi_magic = LNET_PROTO_PING_MAGIC;
 950         ping_info->pi_features = LNET_PING_FEAT_NI_STATUS;
 951
 952         return ping_info;
 953 }
 954
 955 static inline int
 956 lnet_get_net_ni_count_locked(struct lnet_net *net)
 957 {
 958         struct lnet_ni  *ni;
 959         int             count = 0;
 960
 961         list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
 962                 count++;
 963
 964         return count;
 965 }
 966
 967 static inline int
 968 lnet_get_net_ni_count_pre(struct lnet_net *net)
 969 {
 970         struct lnet_ni  *ni;
 971         int             count = 0;
 972
 973         list_for_each_entry(ni, &net->net_ni_added, ni_netlist)
 974                 count++;
 975
 976         return count;
 977 }
 978
 979 static inline int
 980 lnet_get_ni_count(void)
 981 {
 982         struct lnet_ni  *ni;
 983         struct lnet_net *net;
 984         int             count = 0;
 985
 986         lnet_net_lock(0);
 987
 988         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 989                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist)
 990                         count++;
 991         }
 992
 993         lnet_net_unlock(0);
 994
 995         return count;
 996 }
 997
 998 static inline void
 999 lnet_ping_info_free(struct lnet_ping_info *pinfo)
1000 {
1001         LIBCFS_FREE(pinfo,
1002                     offsetof(struct lnet_ping_info,
1003                              pi_ni[pinfo->pi_nnis]));
1004 }
1005
1006 static void
1007 lnet_ping_info_destroy(void)
1008 {
1009         struct lnet_net *net;
1010         struct lnet_ni  *ni;
1011
1012         lnet_net_lock(LNET_LOCK_EX);
1013
1014         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1015                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1016                         lnet_ni_lock(ni);
1017                         ni->ni_status = NULL;
1018                         lnet_ni_unlock(ni);
1019                 }
1020         }
1021
1022         lnet_ping_info_free(the_lnet.ln_ping_info);
1023         the_lnet.ln_ping_info = NULL;
1024
1025         lnet_net_unlock(LNET_LOCK_EX);
1026 }
1027
1028 static void
1029 lnet_ping_event_handler(struct lnet_event *event)
1030 {
1031         struct lnet_ping_info *pinfo = event->md.user_ptr;
1032
1033         if (event->unlinked)
1034                 pinfo->pi_features = LNET_PING_FEAT_INVAL;
1035 }
1036
1037 static int
1038 lnet_ping_info_setup(struct lnet_ping_info **ppinfo,
1039                      struct lnet_handle_md *md_handle,
1040                      int ni_count, bool set_eq)
1041 {
1042         struct lnet_process_id id = {
1043                 .nid = LNET_NID_ANY,
1044                 .pid = LNET_PID_ANY
1045         };
1046         struct lnet_handle_me me_handle;
1047         struct lnet_md md = { NULL };
1048         int rc, rc2;
1049
1050         if (set_eq) {
1051                 rc = LNetEQAlloc(0, lnet_ping_event_handler,
1052                                  &the_lnet.ln_ping_target_eq);
1053                 if (rc != 0) {
1054                         CERROR("Can't allocate ping EQ: %d\n", rc);
1055                         return rc;
1056                 }
1057         }
1058
1059         *ppinfo = lnet_ping_info_create(ni_count);
1060         if (*ppinfo == NULL) {
1061                 rc = -ENOMEM;
1062                 goto failed_0;
1063         }
1064
1065         rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
1066                           LNET_PROTO_PING_MATCHBITS, 0,
1067                           LNET_UNLINK, LNET_INS_AFTER,
1068                           &me_handle);
1069         if (rc != 0) {
1070                 CERROR("Can't create ping ME: %d\n", rc);
1071                 goto failed_1;
1072         }
1073
1074         /* initialize md content */
1075         md.start     = *ppinfo;
1076         md.length    = offsetof(struct lnet_ping_info,
1077                                 pi_ni[(*ppinfo)->pi_nnis]);
1078         md.threshold = LNET_MD_THRESH_INF;
1079         md.max_size  = 0;
1080         md.options   = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
1081                        LNET_MD_MANAGE_REMOTE;
1082         md.user_ptr  = NULL;
1083         md.eq_handle = the_lnet.ln_ping_target_eq;
1084         md.user_ptr = *ppinfo;
1085
1086         rc = LNetMDAttach(me_handle, md, LNET_RETAIN, md_handle);
1087         if (rc != 0) {
1088                 CERROR("Can't attach ping MD: %d\n", rc);
1089                 goto failed_2;
1090         }
1091
1092         return 0;
1093
1094 failed_2:
1095         rc2 = LNetMEUnlink(me_handle);
1096         LASSERT(rc2 == 0);
1097 failed_1:
1098         lnet_ping_info_free(*ppinfo);
1099         *ppinfo = NULL;
1100 failed_0:
1101         if (set_eq)
1102                 LNetEQFree(the_lnet.ln_ping_target_eq);
1103         return rc;
1104 }
1105
1106 static void
1107 lnet_ping_md_unlink(struct lnet_ping_info *pinfo, struct lnet_handle_md *md_handle)
1108 {
1109         sigset_t        blocked = cfs_block_allsigs();
1110
1111         LNetMDUnlink(*md_handle);
1112         LNetInvalidateMDHandle(md_handle);
1113
1114         /* NB md could be busy; this just starts the unlink */
1115         while (pinfo->pi_features != LNET_PING_FEAT_INVAL) {
1116                 CDEBUG(D_NET, "Still waiting for ping MD to unlink\n");
1117                 set_current_state(TASK_UNINTERRUPTIBLE);
1118                 schedule_timeout(cfs_time_seconds(1));
1119         }
1120
1121         cfs_restore_sigs(blocked);
1122 }
1123
1124 static void
1125 lnet_ping_info_install_locked(struct lnet_ping_info *ping_info)
1126 {
1127         int                     i;
1128         struct lnet_ni          *ni;
1129         struct lnet_net         *net;
1130         struct lnet_ni_status *ns;
1131
1132         i = 0;
1133         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
1134                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
1135                         LASSERT(i < ping_info->pi_nnis);
1136
1137                         ns = &ping_info->pi_ni[i];
1138
1139                         ns->ns_nid = ni->ni_nid;
1140
1141                         lnet_ni_lock(ni);
1142                         ns->ns_status = (ni->ni_status != NULL) ?
1143                                         ni->ni_status->ns_status :
1144                                                 LNET_NI_STATUS_UP;
1145                         ni->ni_status = ns;
1146                         lnet_ni_unlock(ni);
1147
1148                         i++;
1149                 }
1150
1151         }
1152 }
1153
1154 static void
1155 lnet_ping_target_update(struct lnet_ping_info *pinfo,
1156                         struct lnet_handle_md md_handle)
1157 {
1158         struct lnet_ping_info *old_pinfo = NULL;
1159         struct lnet_handle_md old_md;
1160
1161         /* switch the NIs to point to the new ping info created */
1162         lnet_net_lock(LNET_LOCK_EX);
1163
1164         if (!the_lnet.ln_routing)
1165                 pinfo->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1166         lnet_ping_info_install_locked(pinfo);
1167
1168         if (the_lnet.ln_ping_info != NULL) {
1169                 old_pinfo = the_lnet.ln_ping_info;
1170                 old_md = the_lnet.ln_ping_target_md;
1171         }
1172         the_lnet.ln_ping_target_md = md_handle;
1173         the_lnet.ln_ping_info = pinfo;
1174
1175         lnet_net_unlock(LNET_LOCK_EX);
1176
1177         if (old_pinfo != NULL) {
1178                 /* unlink the old ping info */
1179                 lnet_ping_md_unlink(old_pinfo, &old_md);
1180                 lnet_ping_info_free(old_pinfo);
1181         }
1182 }
1183
1184 static void
1185 lnet_ping_target_fini(void)
1186 {
1187         int             rc;
1188
1189         lnet_ping_md_unlink(the_lnet.ln_ping_info,
1190                             &the_lnet.ln_ping_target_md);
1191
1192         rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1193         LASSERT(rc == 0);
1194
1195         lnet_ping_info_destroy();
1196 }
1197
1198 static int
1199 lnet_ni_tq_credits(struct lnet_ni *ni)
1200 {
1201         int     credits;
1202
1203         LASSERT(ni->ni_ncpts >= 1);
1204
1205         if (ni->ni_ncpts == 1)
1206                 return ni->ni_net->net_tunables.lct_max_tx_credits;
1207
1208         credits = ni->ni_net->net_tunables.lct_max_tx_credits / ni->ni_ncpts;
1209         credits = max(credits, 8 * ni->ni_net->net_tunables.lct_peer_tx_credits);
1210         credits = min(credits, ni->ni_net->net_tunables.lct_max_tx_credits);
1211
1212         return credits;
1213 }
1214
1215 static void
1216 lnet_ni_unlink_locked(struct lnet_ni *ni)
1217 {
1218         if (!list_empty(&ni->ni_cptlist)) {
1219                 list_del_init(&ni->ni_cptlist);
1220                 lnet_ni_decref_locked(ni, 0);
1221         }
1222
1223         /* move it to zombie list and nobody can find it anymore */
1224         LASSERT(!list_empty(&ni->ni_netlist));
1225         list_move(&ni->ni_netlist, &ni->ni_net->net_ni_zombie);
1226         lnet_ni_decref_locked(ni, 0);
1227 }
1228
1229 static void
1230 lnet_clear_zombies_nis_locked(struct lnet_net *net)
1231 {
1232         int             i;
1233         int             islo;
1234         struct lnet_ni  *ni;
1235         struct list_head *zombie_list = &net->net_ni_zombie;
1236
1237         /*
1238          * Now wait for the NIs I just nuked to show up on the zombie
1239          * list and shut them down in guaranteed thread context
1240          */
1241         i = 2;
1242         while (!list_empty(zombie_list)) {
1243                 int     *ref;
1244                 int     j;
1245
1246                 ni = list_entry(zombie_list->next,
1247                                 struct lnet_ni, ni_netlist);
1248                 list_del_init(&ni->ni_netlist);
1249                 /* the ni should be in deleting state. If it's not it's
1250                  * a bug */
1251                 LASSERT(ni->ni_state == LNET_NI_STATE_DELETING);
1252                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
1253                         if (*ref == 0)
1254                                 continue;
1255                         /* still busy, add it back to zombie list */
1256                         list_add(&ni->ni_netlist, zombie_list);
1257                         break;
1258                 }
1259
1260                 if (!list_empty(&ni->ni_netlist)) {
1261                         lnet_net_unlock(LNET_LOCK_EX);
1262                         ++i;
1263                         if ((i & (-i)) == i) {
1264                                 CDEBUG(D_WARNING,
1265                                        "Waiting for zombie LNI %s\n",
1266                                        libcfs_nid2str(ni->ni_nid));
1267                         }
1268                         set_current_state(TASK_UNINTERRUPTIBLE);
1269                         schedule_timeout(cfs_time_seconds(1));
1270                         lnet_net_lock(LNET_LOCK_EX);
1271                         continue;
1272                 }
1273
1274                 lnet_net_unlock(LNET_LOCK_EX);
1275
1276                 islo = ni->ni_net->net_lnd->lnd_type == LOLND;
1277
1278                 LASSERT(!in_interrupt());
1279                 (net->net_lnd->lnd_shutdown)(ni);
1280
1281                 if (!islo)
1282                         CDEBUG(D_LNI, "Removed LNI %s\n",
1283                               libcfs_nid2str(ni->ni_nid));
1284
1285                 lnet_ni_free(ni);
1286                 i = 2;
1287                 lnet_net_lock(LNET_LOCK_EX);
1288         }
1289 }
1290
1291 /* shutdown down the NI and release refcount */
1292 static void
1293 lnet_shutdown_lndni(struct lnet_ni *ni)
1294 {
1295         int i;
1296         struct lnet_net *net = ni->ni_net;
1297
1298         lnet_net_lock(LNET_LOCK_EX);
1299         ni->ni_state = LNET_NI_STATE_DELETING;
1300         lnet_ni_unlink_locked(ni);
1301         lnet_incr_dlc_seq();
1302         lnet_net_unlock(LNET_LOCK_EX);
1303
1304         /* clear messages for this NI on the lazy portal */
1305         for (i = 0; i < the_lnet.ln_nportals; i++)
1306                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
1307
1308         lnet_net_lock(LNET_LOCK_EX);
1309         lnet_clear_zombies_nis_locked(net);
1310         lnet_net_unlock(LNET_LOCK_EX);
1311 }
1312
1313 static void
1314 lnet_shutdown_lndnet(struct lnet_net *net)
1315 {
1316         struct lnet_ni *ni;
1317
1318         lnet_net_lock(LNET_LOCK_EX);
1319
1320         net->net_state = LNET_NET_STATE_DELETING;
1321
1322         list_del_init(&net->net_list);
1323
1324         while (!list_empty(&net->net_ni_list)) {
1325                 ni = list_entry(net->net_ni_list.next,
1326                                 struct lnet_ni, ni_netlist);
1327                 lnet_net_unlock(LNET_LOCK_EX);
1328                 lnet_shutdown_lndni(ni);
1329                 lnet_net_lock(LNET_LOCK_EX);
1330         }
1331
1332         lnet_net_unlock(LNET_LOCK_EX);
1333
1334         /* Do peer table cleanup for this net */
1335         lnet_peer_tables_cleanup(net);
1336
1337         lnet_net_lock(LNET_LOCK_EX);
1338         /*
1339          * decrement ref count on lnd only when the entire network goes
1340          * away
1341          */
1342         net->net_lnd->lnd_refcount--;
1343
1344         lnet_net_unlock(LNET_LOCK_EX);
1345
1346         lnet_net_free(net);
1347 }
1348
1349 static void
1350 lnet_shutdown_lndnets(void)
1351 {
1352         struct lnet_net *net;
1353
1354         /* NB called holding the global mutex */
1355
1356         /* All quiet on the API front */
1357         LASSERT(!the_lnet.ln_shutdown);
1358         LASSERT(the_lnet.ln_refcount == 0);
1359
1360         lnet_net_lock(LNET_LOCK_EX);
1361         the_lnet.ln_shutdown = 1;       /* flag shutdown */
1362
1363         while (!list_empty(&the_lnet.ln_nets)) {
1364                 /*
1365                  * move the nets to the zombie list to avoid them being
1366                  * picked up for new work. LONET is also included in the
1367                  * Nets that will be moved to the zombie list
1368                  */
1369                 net = list_entry(the_lnet.ln_nets.next,
1370                                  struct lnet_net, net_list);
1371                 list_move(&net->net_list, &the_lnet.ln_net_zombie);
1372         }
1373
1374         /* Drop the cached loopback Net. */
1375         if (the_lnet.ln_loni != NULL) {
1376                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
1377                 the_lnet.ln_loni = NULL;
1378         }
1379         lnet_net_unlock(LNET_LOCK_EX);
1380
1381         /* iterate through the net zombie list and delete each net */
1382         while (!list_empty(&the_lnet.ln_net_zombie)) {
1383                 net = list_entry(the_lnet.ln_net_zombie.next,
1384                                  struct lnet_net, net_list);
1385                 lnet_shutdown_lndnet(net);
1386         }
1387
1388         lnet_net_lock(LNET_LOCK_EX);
1389         the_lnet.ln_shutdown = 0;
1390         lnet_net_unlock(LNET_LOCK_EX);
1391 }
1392
1393 static int
1394 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_lnd_tunables *tun)
1395 {
1396         int                     rc = -EINVAL;
1397         struct lnet_tx_queue    *tq;
1398         int                     i;
1399         struct lnet_net         *net = ni->ni_net;
1400
1401         mutex_lock(&the_lnet.ln_lnd_mutex);
1402
1403         if (tun) {
1404                 memcpy(&ni->ni_lnd_tunables, tun, sizeof(*tun));
1405                 ni->ni_lnd_tunables_set = true;
1406         }
1407
1408         rc = (net->net_lnd->lnd_startup)(ni);
1409
1410         mutex_unlock(&the_lnet.ln_lnd_mutex);
1411
1412         if (rc != 0) {
1413                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
1414                                    rc, libcfs_lnd2str(net->net_lnd->lnd_type));
1415                 lnet_net_lock(LNET_LOCK_EX);
1416                 net->net_lnd->lnd_refcount--;
1417                 lnet_net_unlock(LNET_LOCK_EX);
1418                 goto failed0;
1419         }
1420
1421         ni->ni_state = LNET_NI_STATE_ACTIVE;
1422
1423         /* We keep a reference on the loopback net through the loopback NI */
1424         if (net->net_lnd->lnd_type == LOLND) {
1425                 lnet_ni_addref(ni);
1426                 LASSERT(the_lnet.ln_loni == NULL);
1427                 the_lnet.ln_loni = ni;
1428                 ni->ni_net->net_tunables.lct_peer_tx_credits = 0;
1429                 ni->ni_net->net_tunables.lct_peer_rtr_credits = 0;
1430                 ni->ni_net->net_tunables.lct_max_tx_credits = 0;
1431                 ni->ni_net->net_tunables.lct_peer_timeout = 0;
1432                 return 0;
1433         }
1434
1435         if (ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ||
1436             ni->ni_net->net_tunables.lct_max_tx_credits == 0) {
1437                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1438                                    libcfs_lnd2str(net->net_lnd->lnd_type),
1439                                    ni->ni_net->net_tunables.lct_peer_tx_credits == 0 ?
1440                                         "" : "per-peer ");
1441                 /* shutdown the NI since if we get here then it must've already
1442                  * been started
1443                  */
1444                 lnet_shutdown_lndni(ni);
1445                 return -EINVAL;
1446         }
1447
1448         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1449                 tq->tq_credits_min =
1450                 tq->tq_credits_max =
1451                 tq->tq_credits = lnet_ni_tq_credits(ni);
1452         }
1453
1454         atomic_set(&ni->ni_tx_credits,
1455                    lnet_ni_tq_credits(ni) * ni->ni_ncpts);
1456
1457         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1458                 libcfs_nid2str(ni->ni_nid),
1459                 ni->ni_net->net_tunables.lct_peer_tx_credits,
1460                 lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1461                 ni->ni_net->net_tunables.lct_peer_rtr_credits,
1462                 ni->ni_net->net_tunables.lct_peer_timeout);
1463
1464         return 0;
1465 failed0:
1466         lnet_ni_free(ni);
1467         return rc;
1468 }
1469
1470 static int
1471 lnet_startup_lndnet(struct lnet_net *net, struct lnet_lnd_tunables *tun)
1472 {
1473         struct lnet_ni *ni;
1474         struct lnet_net *net_l = NULL;
1475         struct list_head        local_ni_list;
1476         int                     rc;
1477         int                     ni_count = 0;
1478         __u32                   lnd_type;
1479         struct lnet_lnd *lnd;
1480         int                     peer_timeout =
1481                 net->net_tunables.lct_peer_timeout;
1482         int                     maxtxcredits =
1483                 net->net_tunables.lct_max_tx_credits;
1484         int                     peerrtrcredits =
1485                 net->net_tunables.lct_peer_rtr_credits;
1486
1487         INIT_LIST_HEAD(&local_ni_list);
1488
1489         /*
1490          * make sure that this net is unique. If it isn't then
1491          * we are adding interfaces to an already existing network, and
1492          * 'net' is just a convenient way to pass in the list.
1493          * if it is unique we need to find the LND and load it if
1494          * necessary.
1495          */
1496         if (lnet_net_unique(net->net_id, &the_lnet.ln_nets, &net_l)) {
1497                 lnd_type = LNET_NETTYP(net->net_id);
1498
1499                 LASSERT(libcfs_isknown_lnd(lnd_type));
1500
1501                 mutex_lock(&the_lnet.ln_lnd_mutex);
1502                 lnd = lnet_find_lnd_by_type(lnd_type);
1503
1504                 if (lnd == NULL) {
1505                         mutex_unlock(&the_lnet.ln_lnd_mutex);
1506                         rc = request_module("%s", libcfs_lnd2modname(lnd_type));
1507                         mutex_lock(&the_lnet.ln_lnd_mutex);
1508
1509                         lnd = lnet_find_lnd_by_type(lnd_type);
1510                         if (lnd == NULL) {
1511                                 mutex_unlock(&the_lnet.ln_lnd_mutex);
1512                                 CERROR("Can't load LND %s, module %s, rc=%d\n",
1513                                 libcfs_lnd2str(lnd_type),
1514                                 libcfs_lnd2modname(lnd_type), rc);
1515 #ifndef HAVE_MODULE_LOADING_SUPPORT
1516                                 LCONSOLE_ERROR_MSG(0x104, "Your kernel must be "
1517                                                 "compiled with kernel module "
1518                                                 "loading support.");
1519 #endif
1520                                 rc = -EINVAL;
1521                                 goto failed0;
1522                         }
1523                 }
1524
1525                 lnet_net_lock(LNET_LOCK_EX);
1526                 lnd->lnd_refcount++;
1527                 lnet_net_unlock(LNET_LOCK_EX);
1528
1529                 net->net_lnd = lnd;
1530
1531                 mutex_unlock(&the_lnet.ln_lnd_mutex);
1532
1533                 net_l = net;
1534         }
1535
1536         /*
1537          * net_l: if the network being added is unique then net_l
1538          *        will point to that network
1539          *        if the network being added is not unique then
1540          *        net_l points to the existing network.
1541          *
1542          * When we enter the loop below, we'll pick NIs off he
1543          * network beign added and start them up, then add them to
1544          * a local ni list. Once we've successfully started all
1545          * the NIs then we join the local NI list (of started up
1546          * networks) with the net_l->net_ni_list, which should
1547          * point to the correct network to add the new ni list to
1548          *
1549          * If any of the new NIs fail to start up, then we want to
1550          * iterate through the local ni list, which should include
1551          * any NIs which were successfully started up, and shut
1552          * them down.
1553          *
1554          * After than we want to delete the network being added,
1555          * to avoid a memory leak.
1556          */
1557
1558         /*
1559          * When a network uses TCP bonding then all its interfaces
1560          * must be specified when the network is first defined: the
1561          * TCP bonding code doesn't allow for interfaces to be added
1562          * or removed.
1563          */
1564         if (net_l != net && net_l != NULL && use_tcp_bonding &&
1565             LNET_NETTYP(net_l->net_id) == SOCKLND) {
1566                 rc = -EINVAL;
1567                 goto failed0;
1568         }
1569
1570         while (!list_empty(&net->net_ni_added)) {
1571                 ni = list_entry(net->net_ni_added.next, struct lnet_ni,
1572                                 ni_netlist);
1573                 list_del_init(&ni->ni_netlist);
1574
1575                 /* make sure that the the NI we're about to start
1576                  * up is actually unique. if it's not fail. */
1577                 if (!lnet_ni_unique_net(&net_l->net_ni_list,
1578                                         ni->ni_interfaces[0])) {
1579                         rc = -EINVAL;
1580                         goto failed1;
1581                 }
1582
1583                 /* adjust the pointer the parent network, just in case it
1584                  * the net is a duplicate */
1585                 ni->ni_net = net_l;
1586
1587                 rc = lnet_startup_lndni(ni, tun);
1588
1589                 LASSERT(ni->ni_net->net_tunables.lct_peer_timeout <= 0 ||
1590                         ni->ni_net->net_lnd->lnd_query != NULL);
1591
1592                 if (rc < 0)
1593                         goto failed1;
1594
1595                 lnet_ni_addref(ni);
1596                 list_add_tail(&ni->ni_netlist, &local_ni_list);
1597
1598                 ni_count++;
1599         }
1600
1601         lnet_net_lock(LNET_LOCK_EX);
1602         list_splice_tail(&local_ni_list, &net_l->net_ni_list);
1603         lnet_incr_dlc_seq();
1604         lnet_net_unlock(LNET_LOCK_EX);
1605
1606         /* if the network is not unique then we don't want to keep
1607          * it around after we're done. Free it. Otherwise add that
1608          * net to the global the_lnet.ln_nets */
1609         if (net_l != net && net_l != NULL) {
1610                 /*
1611                  * TODO - note. currently the tunables can not be updated
1612                  * once added
1613                  */
1614                 lnet_net_free(net);
1615         } else {
1616                 net->net_state = LNET_NET_STATE_ACTIVE;
1617                 /*
1618                  * restore tunables after it has been overwitten by the
1619                  * lnd
1620                  */
1621                 if (peer_timeout != -1)
1622                         net->net_tunables.lct_peer_timeout = peer_timeout;
1623                 if (maxtxcredits != -1)
1624                         net->net_tunables.lct_max_tx_credits = maxtxcredits;
1625                 if (peerrtrcredits != -1)
1626                         net->net_tunables.lct_peer_rtr_credits = peerrtrcredits;
1627
1628                 lnet_net_lock(LNET_LOCK_EX);
1629                 list_add_tail(&net->net_list, &the_lnet.ln_nets);
1630                 lnet_net_unlock(LNET_LOCK_EX);
1631         }
1632
1633         return ni_count;
1634
1635 failed1:
1636         /*
1637          * shutdown the new NIs that are being started up
1638          * free the NET being started
1639          */
1640         while (!list_empty(&local_ni_list)) {
1641                 ni = list_entry(local_ni_list.next, struct lnet_ni,
1642                                 ni_netlist);
1643
1644                 lnet_shutdown_lndni(ni);
1645         }
1646
1647 failed0:
1648         lnet_net_free(net);
1649
1650         return rc;
1651 }
1652
1653 static int
1654 lnet_startup_lndnets(struct list_head *netlist)
1655 {
1656         struct lnet_net         *net;
1657         int                     rc;
1658         int                     ni_count = 0;
1659
1660         while (!list_empty(netlist)) {
1661                 net = list_entry(netlist->next, struct lnet_net, net_list);
1662                 list_del_init(&net->net_list);
1663
1664                 rc = lnet_startup_lndnet(net, NULL);
1665
1666                 if (rc < 0)
1667                         goto failed;
1668
1669                 ni_count += rc;
1670         }
1671
1672         return ni_count;
1673 failed:
1674         lnet_shutdown_lndnets();
1675
1676         return rc;
1677 }
1678
1679 /**
1680  * Initialize LNet library.
1681  *
1682  * Automatically called at module loading time. Caller has to call
1683  * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
1684  * latter returned 0. It must be called exactly once.
1685  *
1686  * \retval 0 on success
1687  * \retval -ve on failures.
1688  */
1689 int lnet_lib_init(void)
1690 {
1691         int rc;
1692
1693         lnet_assert_wire_constants();
1694
1695         memset(&the_lnet, 0, sizeof(the_lnet));
1696
1697         /* refer to global cfs_cpt_table for now */
1698         the_lnet.ln_cpt_table   = cfs_cpt_table;
1699         the_lnet.ln_cpt_number  = cfs_cpt_number(cfs_cpt_table);
1700
1701         LASSERT(the_lnet.ln_cpt_number > 0);
1702         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1703                 /* we are under risk of consuming all lh_cookie */
1704                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), "
1705                        "please change setting of CPT-table and retry\n",
1706                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
1707                 return -E2BIG;
1708         }
1709
1710         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1711                 the_lnet.ln_cpt_bits++;
1712
1713         rc = lnet_create_locks();
1714         if (rc != 0) {
1715                 CERROR("Can't create LNet global locks: %d\n", rc);
1716                 return rc;
1717         }
1718
1719         the_lnet.ln_refcount = 0;
1720         LNetInvalidateEQHandle(&the_lnet.ln_rc_eqh);
1721         INIT_LIST_HEAD(&the_lnet.ln_lnds);
1722         INIT_LIST_HEAD(&the_lnet.ln_net_zombie);
1723         INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1724         INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1725
1726         /* The hash table size is the number of bits it takes to express the set
1727          * ln_num_routes, minus 1 (better to under estimate than over so we
1728          * don't waste memory). */
1729         if (rnet_htable_size <= 0)
1730                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
1731         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
1732                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
1733         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
1734                                            order_base_2(rnet_htable_size) - 1);
1735
1736         /* All LNDs apart from the LOLND are in separate modules.  They
1737          * register themselves when their module loads, and unregister
1738          * themselves when their module is unloaded. */
1739         lnet_register_lnd(&the_lolnd);
1740         return 0;
1741 }
1742
1743 /**
1744  * Finalize LNet library.
1745  *
1746  * \pre lnet_lib_init() called with success.
1747  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1748  */
1749 void lnet_lib_exit(void)
1750 {
1751         LASSERT(the_lnet.ln_refcount == 0);
1752
1753         while (!list_empty(&the_lnet.ln_lnds))
1754                 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1755                                                struct lnet_lnd, lnd_list));
1756         lnet_destroy_locks();
1757 }
1758
1759 /**
1760  * Set LNet PID and start LNet interfaces, routing, and forwarding.
1761  *
1762  * Users must call this function at least once before any other functions.
1763  * For each successful call there must be a corresponding call to
1764  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1765  * ignored.
1766  *
1767  * The PID used by LNet may be different from the one requested.
1768  * See LNetGetId().
1769  *
1770  * \param requested_pid PID requested by the caller.
1771  *
1772  * \return >= 0 on success, and < 0 error code on failures.
1773  */
1774 int
1775 LNetNIInit(lnet_pid_t requested_pid)
1776 {
1777         int                     im_a_router = 0;
1778         int                     rc;
1779         int                     ni_count;
1780         struct lnet_ping_info   *pinfo;
1781         struct lnet_handle_md   md_handle;
1782         struct list_head        net_head;
1783         struct lnet_net         *net;
1784
1785         INIT_LIST_HEAD(&net_head);
1786
1787         mutex_lock(&the_lnet.ln_api_mutex);
1788
1789         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1790
1791         if (the_lnet.ln_refcount > 0) {
1792                 rc = the_lnet.ln_refcount++;
1793                 mutex_unlock(&the_lnet.ln_api_mutex);
1794                 return rc;
1795         }
1796
1797         rc = lnet_prepare(requested_pid);
1798         if (rc != 0) {
1799                 mutex_unlock(&the_lnet.ln_api_mutex);
1800                 return rc;
1801         }
1802
1803         /* create a network for Loopback network */
1804         net = lnet_net_alloc(LNET_MKNET(LOLND, 0), &net_head);
1805         if (net == NULL) {
1806                 rc = -ENOMEM;
1807                 goto err_empty_list;
1808         }
1809
1810         /* Add in the loopback NI */
1811         if (lnet_ni_alloc(net, NULL, NULL) == NULL) {
1812                 rc = -ENOMEM;
1813                 goto err_empty_list;
1814         }
1815
1816         /* If LNet is being initialized via DLC it is possible
1817          * that the user requests not to load module parameters (ones which
1818          * are supported by DLC) on initialization.  Therefore, make sure not
1819          * to load networks, routes and forwarding from module parameters
1820          * in this case.  On cleanup in case of failure only clean up
1821          * routes if it has been loaded */
1822         if (!the_lnet.ln_nis_from_mod_params) {
1823                 rc = lnet_parse_networks(&net_head, lnet_get_networks(),
1824                                          use_tcp_bonding);
1825                 if (rc < 0)
1826                         goto err_empty_list;
1827         }
1828
1829         ni_count = lnet_startup_lndnets(&net_head);
1830         if (ni_count < 0) {
1831                 rc = ni_count;
1832                 goto err_empty_list;
1833         }
1834
1835         if (!the_lnet.ln_nis_from_mod_params) {
1836                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1837                 if (rc != 0)
1838                         goto err_shutdown_lndnis;
1839
1840                 rc = lnet_check_routes();
1841                 if (rc != 0)
1842                         goto err_destroy_routes;
1843
1844                 rc = lnet_rtrpools_alloc(im_a_router);
1845                 if (rc != 0)
1846                         goto err_destroy_routes;
1847         }
1848
1849         rc = lnet_acceptor_start();
1850         if (rc != 0)
1851                 goto err_destroy_routes;
1852
1853         the_lnet.ln_refcount = 1;
1854         /* Now I may use my own API functions... */
1855
1856         rc = lnet_ping_info_setup(&pinfo, &md_handle, ni_count, true);
1857         if (rc != 0)
1858                 goto err_acceptor_stop;
1859
1860         lnet_ping_target_update(pinfo, md_handle);
1861
1862         rc = lnet_router_checker_start();
1863         if (rc != 0)
1864                 goto err_stop_ping;
1865
1866         lnet_fault_init();
1867         lnet_proc_init();
1868
1869         mutex_unlock(&the_lnet.ln_api_mutex);
1870
1871         return 0;
1872
1873 err_stop_ping:
1874         lnet_ping_target_fini();
1875 err_acceptor_stop:
1876         the_lnet.ln_refcount = 0;
1877         lnet_acceptor_stop();
1878 err_destroy_routes:
1879         if (!the_lnet.ln_nis_from_mod_params)
1880                 lnet_destroy_routes();
1881 err_shutdown_lndnis:
1882         lnet_shutdown_lndnets();
1883 err_empty_list:
1884         lnet_unprepare();
1885         LASSERT(rc < 0);
1886         mutex_unlock(&the_lnet.ln_api_mutex);
1887         while (!list_empty(&net_head)) {
1888                 struct lnet_net *net;
1889
1890                 net = list_entry(net_head.next, struct lnet_net, net_list);
1891                 list_del_init(&net->net_list);
1892                 lnet_net_free(net);
1893         }
1894         return rc;
1895 }
1896 EXPORT_SYMBOL(LNetNIInit);
1897
1898 /**
1899  * Stop LNet interfaces, routing, and forwarding.
1900  *
1901  * Users must call this function once for each successful call to LNetNIInit().
1902  * Once the LNetNIFini() operation has been started, the results of pending
1903  * API operations are undefined.
1904  *
1905  * \return always 0 for current implementation.
1906  */
1907 int
1908 LNetNIFini()
1909 {
1910         mutex_lock(&the_lnet.ln_api_mutex);
1911
1912         LASSERT(the_lnet.ln_refcount > 0);
1913
1914         if (the_lnet.ln_refcount != 1) {
1915                 the_lnet.ln_refcount--;
1916         } else {
1917                 LASSERT(!the_lnet.ln_niinit_self);
1918
1919                 lnet_fault_fini();
1920
1921                 lnet_proc_fini();
1922                 lnet_router_checker_stop();
1923                 lnet_ping_target_fini();
1924
1925                 /* Teardown fns that use my own API functions BEFORE here */
1926                 the_lnet.ln_refcount = 0;
1927
1928                 lnet_acceptor_stop();
1929                 lnet_destroy_routes();
1930                 lnet_shutdown_lndnets();
1931                 lnet_unprepare();
1932         }
1933
1934         mutex_unlock(&the_lnet.ln_api_mutex);
1935         return 0;
1936 }
1937 EXPORT_SYMBOL(LNetNIFini);
1938
1939 /**
1940  * Grabs the ni data from the ni structure and fills the out
1941  * parameters
1942  *
1943  * \param[in] ni network        interface structure
1944  * \param[out] cfg_ni           NI config information
1945  * \param[out] tun              network and LND tunables
1946  */
1947 static void
1948 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_ni *cfg_ni,
1949                    struct lnet_ioctl_config_lnd_tunables *tun,
1950                    struct lnet_ioctl_element_stats *stats,
1951                    __u32 tun_size)
1952 {
1953         size_t min_size = 0;
1954         int i;
1955
1956         if (!ni || !cfg_ni || !tun)
1957                 return;
1958
1959         if (ni->ni_interfaces[0] != NULL) {
1960                 for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
1961                         if (ni->ni_interfaces[i] != NULL) {
1962                                 strncpy(cfg_ni->lic_ni_intf[i],
1963                                         ni->ni_interfaces[i],
1964                                         sizeof(cfg_ni->lic_ni_intf[i]));
1965                         }
1966                 }
1967         }
1968
1969         cfg_ni->lic_nid = ni->ni_nid;
1970         cfg_ni->lic_status = ni->ni_status->ns_status;
1971         cfg_ni->lic_tcp_bonding = use_tcp_bonding;
1972         cfg_ni->lic_dev_cpt = ni->ni_dev_cpt;
1973
1974         memcpy(&tun->lt_cmn, &ni->ni_net->net_tunables, sizeof(tun->lt_cmn));
1975
1976         if (stats) {
1977                 stats->iel_send_count = atomic_read(&ni->ni_stats.send_count);
1978                 stats->iel_recv_count = atomic_read(&ni->ni_stats.recv_count);
1979         }
1980
1981         /*
1982          * tun->lt_tun will always be present, but in order to be
1983          * backwards compatible, we need to deal with the cases when
1984          * tun->lt_tun is smaller than what the kernel has, because it
1985          * comes from an older version of a userspace program, then we'll
1986          * need to copy as much information as we have available space.
1987          */
1988         min_size = tun_size - sizeof(tun->lt_cmn);
1989         memcpy(&tun->lt_tun, &ni->ni_lnd_tunables, min_size);
1990
1991         /* copy over the cpts */
1992         if (ni->ni_ncpts == LNET_CPT_NUMBER &&
1993             ni->ni_cpts == NULL)  {
1994                 for (i = 0; i < ni->ni_ncpts; i++)
1995                         cfg_ni->lic_cpts[i] = i;
1996         } else {
1997                 for (i = 0;
1998                      ni->ni_cpts != NULL && i < ni->ni_ncpts &&
1999                      i < LNET_MAX_SHOW_NUM_CPT;
2000                      i++)
2001                         cfg_ni->lic_cpts[i] = ni->ni_cpts[i];
2002         }
2003         cfg_ni->lic_ncpts = ni->ni_ncpts;
2004 }
2005
2006 /**
2007  * NOTE: This is a legacy function left in the code to be backwards
2008  * compatible with older userspace programs. It should eventually be
2009  * removed.
2010  *
2011  * Grabs the ni data from the ni structure and fills the out
2012  * parameters
2013  *
2014  * \param[in] ni network        interface structure
2015  * \param[out] config           config information
2016  */
2017 static void
2018 lnet_fill_ni_info_legacy(struct lnet_ni *ni,
2019                          struct lnet_ioctl_config_data *config)
2020 {
2021         struct lnet_ioctl_net_config *net_config;
2022         struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
2023         size_t min_size, tunable_size = 0;
2024         int i;
2025
2026         if (!ni || !config)
2027                 return;
2028
2029         net_config = (struct lnet_ioctl_net_config *) config->cfg_bulk;
2030         if (!net_config)
2031                 return;
2032
2033         BUILD_BUG_ON(ARRAY_SIZE(ni->ni_interfaces) !=
2034                      ARRAY_SIZE(net_config->ni_interfaces));
2035
2036         for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
2037                 if (!ni->ni_interfaces[i])
2038                         break;
2039
2040                 strncpy(net_config->ni_interfaces[i],
2041                         ni->ni_interfaces[i],
2042                         sizeof(net_config->ni_interfaces[i]));
2043         }
2044
2045         config->cfg_nid = ni->ni_nid;
2046         config->cfg_config_u.cfg_net.net_peer_timeout =
2047                 ni->ni_net->net_tunables.lct_peer_timeout;
2048         config->cfg_config_u.cfg_net.net_max_tx_credits =
2049                 ni->ni_net->net_tunables.lct_max_tx_credits;
2050         config->cfg_config_u.cfg_net.net_peer_tx_credits =
2051                 ni->ni_net->net_tunables.lct_peer_tx_credits;
2052         config->cfg_config_u.cfg_net.net_peer_rtr_credits =
2053                 ni->ni_net->net_tunables.lct_peer_rtr_credits;
2054
2055         net_config->ni_status = ni->ni_status->ns_status;
2056
2057         if (ni->ni_cpts) {
2058                 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
2059
2060                 for (i = 0; i < num_cpts; i++)
2061                         net_config->ni_cpts[i] = ni->ni_cpts[i];
2062
2063                 config->cfg_ncpts = num_cpts;
2064         }
2065
2066         /*
2067          * See if user land tools sent in a newer and larger version
2068          * of struct lnet_tunables than what the kernel uses.
2069          */
2070         min_size = sizeof(*config) + sizeof(*net_config);
2071
2072         if (config->cfg_hdr.ioc_len > min_size)
2073                 tunable_size = config->cfg_hdr.ioc_len - min_size;
2074
2075         /* Don't copy too much data to user space */
2076         min_size = min(tunable_size, sizeof(ni->ni_lnd_tunables));
2077         lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
2078
2079         if (lnd_cfg && min_size) {
2080                 memcpy(&lnd_cfg->lt_tun, &ni->ni_lnd_tunables, min_size);
2081                 config->cfg_config_u.cfg_net.net_interface_count = 1;
2082
2083                 /* Tell user land that kernel side has less data */
2084                 if (tunable_size > sizeof(ni->ni_lnd_tunables)) {
2085                         min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
2086                         config->cfg_hdr.ioc_len -= min_size;
2087                 }
2088         }
2089 }
2090
2091 struct lnet_ni *
2092 lnet_get_ni_idx_locked(int idx)
2093 {
2094         struct lnet_ni          *ni;
2095         struct lnet_net         *net;
2096
2097         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
2098                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
2099                         if (idx-- == 0)
2100                                 return ni;
2101                 }
2102         }
2103
2104         return NULL;
2105 }
2106
2107 struct lnet_ni *
2108 lnet_get_next_ni_locked(struct lnet_net *mynet, struct lnet_ni *prev)
2109 {
2110         struct lnet_ni          *ni;
2111         struct lnet_net         *net = mynet;
2112
2113         if (prev == NULL) {
2114                 if (net == NULL)
2115                         net = list_entry(the_lnet.ln_nets.next, struct lnet_net,
2116                                         net_list);
2117                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2118                                 ni_netlist);
2119
2120                 return ni;
2121         }
2122
2123         if (prev->ni_netlist.next == &prev->ni_net->net_ni_list) {
2124                 /* if you reached the end of the ni list and the net is
2125                  * specified, then there are no more nis in that net */
2126                 if (net != NULL)
2127                         return NULL;
2128
2129                 /* we reached the end of this net ni list. move to the
2130                  * next net */
2131                 if (prev->ni_net->net_list.next == &the_lnet.ln_nets)
2132                         /* no more nets and no more NIs. */
2133                         return NULL;
2134
2135                 /* get the next net */
2136                 net = list_entry(prev->ni_net->net_list.next, struct lnet_net,
2137                                  net_list);
2138                 /* get the ni on it */
2139                 ni = list_entry(net->net_ni_list.next, struct lnet_ni,
2140                                 ni_netlist);
2141
2142                 return ni;
2143         }
2144
2145         /* there are more nis left */
2146         ni = list_entry(prev->ni_netlist.next, struct lnet_ni, ni_netlist);
2147
2148         return ni;
2149 }
2150
2151 int
2152 lnet_get_net_config(struct lnet_ioctl_config_data *config)
2153 {
2154         struct lnet_ni *ni;
2155         int cpt;
2156         int rc = -ENOENT;
2157         int idx = config->cfg_count;
2158
2159         cpt = lnet_net_lock_current();
2160
2161         ni = lnet_get_ni_idx_locked(idx);
2162
2163         if (ni != NULL) {
2164                 rc = 0;
2165                 lnet_ni_lock(ni);
2166                 lnet_fill_ni_info_legacy(ni, config);
2167                 lnet_ni_unlock(ni);
2168         }
2169
2170         lnet_net_unlock(cpt);
2171         return rc;
2172 }
2173
2174 int
2175 lnet_get_ni_config(struct lnet_ioctl_config_ni *cfg_ni,
2176                    struct lnet_ioctl_config_lnd_tunables *tun,
2177                    struct lnet_ioctl_element_stats *stats,
2178                    __u32 tun_size)
2179 {
2180         struct lnet_ni          *ni;
2181         int                     cpt;
2182         int                     rc = -ENOENT;
2183
2184         if (!cfg_ni || !tun || !stats)
2185                 return -EINVAL;
2186
2187         cpt = lnet_net_lock_current();
2188
2189         ni = lnet_get_ni_idx_locked(cfg_ni->lic_idx);
2190
2191         if (ni) {
2192                 rc = 0;
2193                 lnet_ni_lock(ni);
2194                 lnet_fill_ni_info(ni, cfg_ni, tun, stats, tun_size);
2195                 lnet_ni_unlock(ni);
2196         }
2197
2198         lnet_net_unlock(cpt);
2199         return rc;
2200 }
2201
2202 static int lnet_add_net_common(struct lnet_net *net,
2203                                struct lnet_ioctl_config_lnd_tunables *tun)
2204 {
2205         __u32                   net_id;
2206         struct lnet_ping_info   *pinfo;
2207         struct lnet_handle_md   md_handle;
2208         int                     rc;
2209         struct lnet_remotenet *rnet;
2210         int                     net_ni_count;
2211         int                     num_acceptor_nets;
2212
2213         lnet_net_lock(LNET_LOCK_EX);
2214         rnet = lnet_find_rnet_locked(net->net_id);
2215         lnet_net_unlock(LNET_LOCK_EX);
2216         /*
2217          * make sure that the net added doesn't invalidate the current
2218          * configuration LNet is keeping
2219          */
2220         if (rnet) {
2221                 CERROR("Adding net %s will invalidate routing configuration\n",
2222                        libcfs_net2str(net->net_id));
2223                 lnet_net_free(net);
2224                 return -EUSERS;
2225         }
2226
2227         /*
2228          * make sure you calculate the correct number of slots in the ping
2229          * info. Since the ping info is a flattened list of all the NIs,
2230          * we should allocate enough slots to accomodate the number of NIs
2231          * which will be added.
2232          *
2233          * since ni hasn't been configured yet, use
2234          * lnet_get_net_ni_count_pre() which checks the net_ni_added list
2235          */
2236         net_ni_count = lnet_get_net_ni_count_pre(net);
2237
2238         rc = lnet_ping_info_setup(&pinfo, &md_handle,
2239                                   net_ni_count + lnet_get_ni_count(),
2240                                   false);
2241         if (rc < 0) {
2242                 lnet_net_free(net);
2243                 return rc;
2244         }
2245
2246         if (tun)
2247                 memcpy(&net->net_tunables,
2248                        &tun->lt_cmn, sizeof(net->net_tunables));
2249         else
2250                 memset(&net->net_tunables, -1, sizeof(net->net_tunables));
2251
2252         /*
2253          * before starting this network get a count of the current TCP
2254          * networks which require the acceptor thread running. If that
2255          * count is == 0 before we start up this network, then we'd want to
2256          * start up the acceptor thread after starting up this network
2257          */
2258         num_acceptor_nets = lnet_count_acceptor_nets();
2259
2260         net_id = net->net_id;
2261
2262         rc = lnet_startup_lndnet(net,
2263                                  (tun) ? &tun->lt_tun : NULL);
2264         if (rc < 0)
2265                 goto failed;
2266
2267         lnet_net_lock(LNET_LOCK_EX);
2268         net = lnet_get_net_locked(net_id);
2269         lnet_net_unlock(LNET_LOCK_EX);
2270
2271         LASSERT(net);
2272
2273         /*
2274          * Start the acceptor thread if this is the first network
2275          * being added that requires the thread.
2276          */
2277         if (net->net_lnd->lnd_accept && num_acceptor_nets == 0) {
2278                 rc = lnet_acceptor_start();
2279                 if (rc < 0) {
2280                         /* shutdown the net that we just started */
2281                         CERROR("Failed to start up acceptor thread\n");
2282                         lnet_shutdown_lndnet(net);
2283                         goto failed;
2284                 }
2285         }
2286
2287         lnet_net_lock(LNET_LOCK_EX);
2288         lnet_peer_net_added(net);
2289         lnet_net_unlock(LNET_LOCK_EX);
2290
2291         lnet_ping_target_update(pinfo, md_handle);
2292
2293         return 0;
2294
2295 failed:
2296         lnet_ping_md_unlink(pinfo, &md_handle);
2297         lnet_ping_info_free(pinfo);
2298         return rc;
2299 }
2300
2301 static int lnet_handle_legacy_ip2nets(char *ip2nets,
2302                                       struct lnet_ioctl_config_lnd_tunables *tun)
2303 {
2304         struct lnet_net *net;
2305         char *nets;
2306         int rc;
2307         struct list_head net_head;
2308
2309         INIT_LIST_HEAD(&net_head);
2310
2311         rc = lnet_parse_ip2nets(&nets, ip2nets);
2312         if (rc < 0)
2313                 return rc;
2314
2315         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
2316         if (rc < 0)
2317                 return rc;
2318
2319         mutex_lock(&the_lnet.ln_api_mutex);
2320         while (!list_empty(&net_head)) {
2321                 net = list_entry(net_head.next, struct lnet_net, net_list);
2322                 list_del_init(&net->net_list);
2323                 rc = lnet_add_net_common(net, tun);
2324                 if (rc < 0)
2325                         goto out;
2326         }
2327
2328 out:
2329         mutex_unlock(&the_lnet.ln_api_mutex);
2330
2331         while (!list_empty(&net_head)) {
2332                 net = list_entry(net_head.next, struct lnet_net, net_list);
2333                 list_del_init(&net->net_list);
2334                 lnet_net_free(net);
2335         }
2336         return rc;
2337 }
2338
2339 int lnet_dyn_add_ni(struct lnet_ioctl_config_ni *conf)
2340 {
2341         struct lnet_net *net;
2342         struct lnet_ni *ni;
2343         struct lnet_ioctl_config_lnd_tunables *tun = NULL;
2344         int rc, i;
2345         __u32 net_id;
2346
2347         /* get the tunables if they are available */
2348         if (conf->lic_cfg_hdr.ioc_len >=
2349             sizeof(*conf) + sizeof(*tun))
2350                 tun = (struct lnet_ioctl_config_lnd_tunables *)
2351                         conf->lic_bulk;
2352
2353         /* handle legacy ip2nets from DLC */
2354         if (conf->lic_legacy_ip2nets[0] != '\0')
2355                 return lnet_handle_legacy_ip2nets(conf->lic_legacy_ip2nets,
2356                                                   tun);
2357
2358         net_id = LNET_NIDNET(conf->lic_nid);
2359
2360         net = lnet_net_alloc(net_id, NULL);
2361         if (!net)
2362                 return -ENOMEM;
2363
2364         for (i = 0; i < conf->lic_ncpts; i++) {
2365                 if (conf->lic_cpts[i] >= LNET_CPT_NUMBER)
2366                         return -EINVAL;
2367         }
2368
2369         ni = lnet_ni_alloc_w_cpt_array(net, conf->lic_cpts, conf->lic_ncpts,
2370                                        conf->lic_ni_intf[0]);
2371         if (!ni)
2372                 return -ENOMEM;
2373
2374         mutex_lock(&the_lnet.ln_api_mutex);
2375
2376         rc = lnet_add_net_common(net, tun);
2377
2378         mutex_unlock(&the_lnet.ln_api_mutex);
2379
2380         return rc;
2381 }
2382
2383 int lnet_dyn_del_ni(struct lnet_ioctl_config_ni *conf)
2384 {
2385         struct lnet_net  *net;
2386         struct lnet_ni *ni;
2387         __u32 net_id = LNET_NIDNET(conf->lic_nid);
2388         struct lnet_ping_info *pinfo;
2389         struct lnet_handle_md md_handle;
2390         int               rc;
2391         int               net_count;
2392         __u32             addr;
2393
2394         /* don't allow userspace to shutdown the LOLND */
2395         if (LNET_NETTYP(net_id) == LOLND)
2396                 return -EINVAL;
2397
2398         mutex_lock(&the_lnet.ln_api_mutex);
2399
2400         lnet_net_lock(0);
2401
2402         net = lnet_get_net_locked(net_id);
2403         if (!net) {
2404                 CERROR("net %s not found\n",
2405                        libcfs_net2str(net_id));
2406                 rc = -ENOENT;
2407                 goto net_unlock;
2408         }
2409
2410         addr = LNET_NIDADDR(conf->lic_nid);
2411         if (addr == 0) {
2412                 /* remove the entire net */
2413                 net_count = lnet_get_net_ni_count_locked(net);
2414
2415                 lnet_net_unlock(0);
2416
2417                 /* create and link a new ping info, before removing the old one */
2418                 rc = lnet_ping_info_setup(&pinfo, &md_handle,
2419                                         lnet_get_ni_count() - net_count,
2420                                         false);
2421                 if (rc != 0)
2422                         goto out;
2423
2424                 lnet_shutdown_lndnet(net);
2425
2426                 if (lnet_count_acceptor_nets() == 0)
2427                         lnet_acceptor_stop();
2428
2429                 lnet_ping_target_update(pinfo, md_handle);
2430
2431                 goto out;
2432         }
2433
2434         ni = lnet_nid2ni_locked(conf->lic_nid, 0);
2435         if (!ni) {
2436                 CERROR("nid %s not found \n",
2437                        libcfs_nid2str(conf->lic_nid));
2438                 rc = -ENOENT;
2439                 goto net_unlock;
2440         }
2441
2442         net_count = lnet_get_net_ni_count_locked(net);
2443
2444         lnet_net_unlock(0);
2445
2446         /* create and link a new ping info, before removing the old one */
2447         rc = lnet_ping_info_setup(&pinfo, &md_handle,
2448                                   lnet_get_ni_count() - 1, false);
2449         if (rc != 0)
2450                 goto out;
2451
2452         lnet_shutdown_lndni(ni);
2453
2454         if (lnet_count_acceptor_nets() == 0)
2455                 lnet_acceptor_stop();
2456
2457         lnet_ping_target_update(pinfo, md_handle);
2458
2459         /* check if the net is empty and remove it if it is */
2460         if (net_count == 1)
2461                 lnet_shutdown_lndnet(net);
2462
2463         goto out;
2464
2465 net_unlock:
2466         lnet_net_unlock(0);
2467 out:
2468         mutex_unlock(&the_lnet.ln_api_mutex);
2469
2470         return rc;
2471 }
2472
2473 /*
2474  * lnet_dyn_add_net and lnet_dyn_del_net are now deprecated.
2475  * They are only expected to be called for unique networks.
2476  * That can be as a result of older DLC library
2477  * calls. Multi-Rail DLC and beyond no longer uses these APIs.
2478  */
2479 int
2480 lnet_dyn_add_net(struct lnet_ioctl_config_data *conf)
2481 {
2482         struct lnet_net         *net;
2483         struct list_head        net_head;
2484         int                     rc;
2485         struct lnet_ioctl_config_lnd_tunables tun;
2486         char *nets = conf->cfg_config_u.cfg_net.net_intf;
2487
2488         INIT_LIST_HEAD(&net_head);
2489
2490         /* Create a net/ni structures for the network string */
2491         rc = lnet_parse_networks(&net_head, nets, use_tcp_bonding);
2492         if (rc <= 0)
2493                 return rc == 0 ? -EINVAL : rc;
2494
2495         mutex_lock(&the_lnet.ln_api_mutex);
2496
2497         if (rc > 1) {
2498                 rc = -EINVAL; /* only add one network per call */
2499                 goto failed;
2500         }
2501
2502         net = list_entry(net_head.next, struct lnet_net, net_list);
2503         list_del_init(&net->net_list);
2504
2505         LASSERT(lnet_net_unique(net->net_id, &the_lnet.ln_nets, NULL));
2506
2507         memset(&tun, 0, sizeof(tun));
2508
2509         tun.lt_cmn.lct_peer_timeout =
2510           conf->cfg_config_u.cfg_net.net_peer_timeout;
2511         tun.lt_cmn.lct_peer_tx_credits =
2512           conf->cfg_config_u.cfg_net.net_peer_tx_credits;
2513         tun.lt_cmn.lct_peer_rtr_credits =
2514           conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
2515         tun.lt_cmn.lct_max_tx_credits =
2516           conf->cfg_config_u.cfg_net.net_max_tx_credits;
2517
2518         rc = lnet_add_net_common(net, &tun);
2519         if (rc != 0)
2520                 goto failed;
2521
2522         return 0;
2523
2524 failed:
2525         mutex_unlock(&the_lnet.ln_api_mutex);
2526         while (!list_empty(&net_head)) {
2527                 net = list_entry(net_head.next, struct lnet_net, net_list);
2528                 list_del_init(&net->net_list);
2529                 lnet_net_free(net);
2530         }
2531         return rc;
2532 }
2533
2534 int
2535 lnet_dyn_del_net(__u32 net_id)
2536 {
2537         struct lnet_net  *net;
2538         struct lnet_ping_info *pinfo;
2539         struct lnet_handle_md md_handle;
2540         int               rc;
2541         int               net_ni_count;
2542
2543         /* don't allow userspace to shutdown the LOLND */
2544         if (LNET_NETTYP(net_id) == LOLND)
2545                 return -EINVAL;
2546
2547         mutex_lock(&the_lnet.ln_api_mutex);
2548
2549         lnet_net_lock(0);
2550
2551         net = lnet_get_net_locked(net_id);
2552         if (net == NULL) {
2553                 rc = -EINVAL;
2554                 goto out;
2555         }
2556
2557         net_ni_count = lnet_get_net_ni_count_locked(net);
2558
2559         lnet_net_unlock(0);
2560
2561         /* create and link a new ping info, before removing the old one */
2562         rc = lnet_ping_info_setup(&pinfo, &md_handle,
2563                                   lnet_get_ni_count() - net_ni_count, false);
2564         if (rc != 0)
2565                 goto out;
2566
2567         lnet_shutdown_lndnet(net);
2568
2569         if (lnet_count_acceptor_nets() == 0)
2570                 lnet_acceptor_stop();
2571
2572         lnet_ping_target_update(pinfo, md_handle);
2573
2574 out:
2575         mutex_unlock(&the_lnet.ln_api_mutex);
2576
2577         return rc;
2578 }
2579
2580 void lnet_incr_dlc_seq(void)
2581 {
2582         atomic_inc(&lnet_dlc_seq_no);
2583 }
2584
2585 __u32 lnet_get_dlc_seq_locked(void)
2586 {
2587         return atomic_read(&lnet_dlc_seq_no);
2588 }
2589
2590 /**
2591  * LNet ioctl handler.
2592  *
2593  */
2594 int
2595 LNetCtl(unsigned int cmd, void *arg)
2596 {
2597         struct libcfs_ioctl_data *data = arg;
2598         struct lnet_ioctl_config_data *config;
2599         struct lnet_process_id    id = {0};
2600         struct lnet_ni           *ni;
2601         int                       rc;
2602
2603         BUILD_BUG_ON(sizeof(struct lnet_ioctl_net_config) +
2604                      sizeof(struct lnet_ioctl_config_data) > LIBCFS_IOC_DATA_MAX);
2605
2606         switch (cmd) {
2607         case IOC_LIBCFS_GET_NI:
2608                 rc = LNetGetId(data->ioc_count, &id);
2609                 data->ioc_nid = id.nid;
2610                 return rc;
2611
2612         case IOC_LIBCFS_FAIL_NID:
2613                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
2614
2615         case IOC_LIBCFS_ADD_ROUTE:
2616                 config = arg;
2617
2618                 if (config->cfg_hdr.ioc_len < sizeof(*config))
2619                         return -EINVAL;
2620
2621                 mutex_lock(&the_lnet.ln_api_mutex);
2622                 rc = lnet_add_route(config->cfg_net,
2623                                     config->cfg_config_u.cfg_route.rtr_hop,
2624                                     config->cfg_nid,
2625                                     config->cfg_config_u.cfg_route.
2626                                         rtr_priority);
2627                 if (rc == 0) {
2628                         rc = lnet_check_routes();
2629                         if (rc != 0)
2630                                 lnet_del_route(config->cfg_net,
2631                                                config->cfg_nid);
2632                 }
2633                 mutex_unlock(&the_lnet.ln_api_mutex);
2634                 return rc;
2635
2636         case IOC_LIBCFS_DEL_ROUTE:
2637                 config = arg;
2638
2639                 if (config->cfg_hdr.ioc_len < sizeof(*config))
2640                         return -EINVAL;
2641
2642                 mutex_lock(&the_lnet.ln_api_mutex);
2643                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
2644                 mutex_unlock(&the_lnet.ln_api_mutex);
2645                 return rc;
2646
2647         case IOC_LIBCFS_GET_ROUTE:
2648                 config = arg;
2649
2650                 if (config->cfg_hdr.ioc_len < sizeof(*config))
2651                         return -EINVAL;
2652
2653                 mutex_lock(&the_lnet.ln_api_mutex);
2654                 rc = lnet_get_route(config->cfg_count,
2655                                     &config->cfg_net,
2656                                     &config->cfg_config_u.cfg_route.rtr_hop,
2657                                     &config->cfg_nid,
2658                                     &config->cfg_config_u.cfg_route.rtr_flags,
2659                                     &config->cfg_config_u.cfg_route.
2660                                         rtr_priority);
2661                 mutex_unlock(&the_lnet.ln_api_mutex);
2662                 return rc;
2663
2664         case IOC_LIBCFS_GET_LOCAL_NI: {
2665                 struct lnet_ioctl_config_ni *cfg_ni;
2666                 struct lnet_ioctl_config_lnd_tunables *tun = NULL;
2667                 struct lnet_ioctl_element_stats *stats;
2668                 __u32 tun_size;
2669
2670                 cfg_ni = arg;
2671                 /* get the tunables if they are available */
2672                 if (cfg_ni->lic_cfg_hdr.ioc_len <
2673                     sizeof(*cfg_ni) + sizeof(*stats)+ sizeof(*tun))
2674                         return -EINVAL;
2675
2676                 stats = (struct lnet_ioctl_element_stats *)
2677                         cfg_ni->lic_bulk;
2678                 tun = (struct lnet_ioctl_config_lnd_tunables *)
2679                                 (cfg_ni->lic_bulk + sizeof(*stats));
2680
2681                 tun_size = cfg_ni->lic_cfg_hdr.ioc_len - sizeof(*cfg_ni) -
2682                         sizeof(*stats);
2683
2684                 mutex_lock(&the_lnet.ln_api_mutex);
2685                 rc = lnet_get_ni_config(cfg_ni, tun, stats, tun_size);
2686                 mutex_unlock(&the_lnet.ln_api_mutex);
2687                 return rc;
2688         }
2689
2690         case IOC_LIBCFS_GET_NET: {
2691                 size_t total = sizeof(*config) +
2692                                sizeof(struct lnet_ioctl_net_config);
2693                 config = arg;
2694
2695                 if (config->cfg_hdr.ioc_len < total)
2696                         return -EINVAL;
2697
2698                 mutex_lock(&the_lnet.ln_api_mutex);
2699                 rc = lnet_get_net_config(config);
2700                 mutex_unlock(&the_lnet.ln_api_mutex);
2701                 return rc;
2702         }
2703
2704         case IOC_LIBCFS_GET_LNET_STATS:
2705         {
2706                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
2707
2708                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
2709                         return -EINVAL;
2710
2711                 mutex_lock(&the_lnet.ln_api_mutex);
2712                 lnet_counters_get(&lnet_stats->st_cntrs);
2713                 mutex_unlock(&the_lnet.ln_api_mutex);
2714                 return 0;
2715         }
2716
2717         case IOC_LIBCFS_CONFIG_RTR:
2718                 config = arg;
2719
2720                 if (config->cfg_hdr.ioc_len < sizeof(*config))
2721                         return -EINVAL;
2722
2723                 mutex_lock(&the_lnet.ln_api_mutex);
2724                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
2725                         rc = lnet_rtrpools_enable();
2726                         mutex_unlock(&the_lnet.ln_api_mutex);
2727                         return rc;
2728                 }
2729                 lnet_rtrpools_disable();
2730                 mutex_unlock(&the_lnet.ln_api_mutex);
2731                 return 0;
2732
2733         case IOC_LIBCFS_ADD_BUF:
2734                 config = arg;
2735
2736                 if (config->cfg_hdr.ioc_len < sizeof(*config))
2737                         return -EINVAL;
2738
2739                 mutex_lock(&the_lnet.ln_api_mutex);
2740                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.
2741                                                 buf_tiny,
2742                                           config->cfg_config_u.cfg_buffers.
2743                                                 buf_small,
2744                                           config->cfg_config_u.cfg_buffers.
2745                                                 buf_large);
2746                 mutex_unlock(&the_lnet.ln_api_mutex);
2747                 return rc;
2748
2749         case IOC_LIBCFS_SET_NUMA_RANGE: {
2750                 struct lnet_ioctl_numa_range *numa;
2751                 numa = arg;
2752                 if (numa->nr_hdr.ioc_len != sizeof(*numa))
2753                         return -EINVAL;
2754                 mutex_lock(&the_lnet.ln_api_mutex);
2755                 lnet_numa_range = numa->nr_range;
2756                 mutex_unlock(&the_lnet.ln_api_mutex);
2757                 return 0;
2758         }
2759
2760         case IOC_LIBCFS_GET_NUMA_RANGE: {
2761                 struct lnet_ioctl_numa_range *numa;
2762                 numa = arg;
2763                 if (numa->nr_hdr.ioc_len != sizeof(*numa))
2764                         return -EINVAL;
2765                 numa->nr_range = lnet_numa_range;
2766                 return 0;
2767         }
2768
2769         case IOC_LIBCFS_GET_BUF: {
2770                 struct lnet_ioctl_pool_cfg *pool_cfg;
2771                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
2772
2773                 config = arg;
2774
2775                 if (config->cfg_hdr.ioc_len < total)
2776                         return -EINVAL;
2777
2778                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
2779
2780                 mutex_lock(&the_lnet.ln_api_mutex);
2781                 rc = lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
2782                 mutex_unlock(&the_lnet.ln_api_mutex);
2783                 return rc;
2784         }
2785
2786         case IOC_LIBCFS_ADD_PEER_NI: {
2787                 struct lnet_ioctl_peer_cfg *cfg = arg;
2788
2789                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
2790                         return -EINVAL;
2791
2792                 mutex_lock(&the_lnet.ln_api_mutex);
2793                 rc = lnet_add_peer_ni_to_peer(cfg->prcfg_prim_nid,
2794                                               cfg->prcfg_cfg_nid,
2795                                               cfg->prcfg_mr);
2796                 mutex_unlock(&the_lnet.ln_api_mutex);
2797                 return rc;
2798         }
2799
2800         case IOC_LIBCFS_DEL_PEER_NI: {
2801                 struct lnet_ioctl_peer_cfg *cfg = arg;
2802
2803                 if (cfg->prcfg_hdr.ioc_len < sizeof(*cfg))
2804                         return -EINVAL;
2805
2806                 mutex_lock(&the_lnet.ln_api_mutex);
2807                 rc = lnet_del_peer_ni_from_peer(cfg->prcfg_prim_nid,
2808                                                 cfg->prcfg_cfg_nid);
2809                 mutex_unlock(&the_lnet.ln_api_mutex);
2810                 return rc;
2811         }
2812
2813         case IOC_LIBCFS_GET_PEER_INFO: {
2814                 struct lnet_ioctl_peer *peer_info = arg;
2815
2816                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
2817                         return -EINVAL;
2818
2819                 mutex_lock(&the_lnet.ln_api_mutex);
2820                 rc = lnet_get_peer_ni_info(
2821                    peer_info->pr_count,
2822                    &peer_info->pr_nid,
2823                    peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
2824                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
2825                    &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
2826                    &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
2827                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
2828                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
2829                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_tx_credits,
2830                    &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
2831                 mutex_unlock(&the_lnet.ln_api_mutex);
2832                 return rc;
2833         }
2834
2835         case IOC_LIBCFS_GET_PEER_NI: {
2836                 struct lnet_ioctl_peer_cfg *cfg = arg;
2837                 struct lnet_peer_ni_credit_info __user *lpni_cri;
2838                 struct lnet_ioctl_element_stats __user *lpni_stats;
2839                 size_t usr_size = sizeof(*lpni_cri) + sizeof(*lpni_stats);
2840
2841                 if ((cfg->prcfg_hdr.ioc_len != sizeof(*cfg)) ||
2842                     (cfg->prcfg_size != usr_size))
2843                         return -EINVAL;
2844
2845                 lpni_cri = cfg->prcfg_bulk;
2846                 lpni_stats = cfg->prcfg_bulk + sizeof(*lpni_cri);
2847
2848                 mutex_lock(&the_lnet.ln_api_mutex);
2849                 rc = lnet_get_peer_info(cfg->prcfg_count, &cfg->prcfg_prim_nid,
2850                                         &cfg->prcfg_cfg_nid, &cfg->prcfg_mr,
2851                                         lpni_cri, lpni_stats);
2852                 mutex_unlock(&the_lnet.ln_api_mutex);
2853                 return rc;
2854         }
2855
2856         case IOC_LIBCFS_NOTIFY_ROUTER: {
2857                 unsigned long jiffies_passed;
2858
2859                 jiffies_passed = ktime_get_real_seconds() - data->ioc_u64[0];
2860                 jiffies_passed = cfs_time_seconds(jiffies_passed);
2861
2862                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
2863                                    jiffies - jiffies_passed);
2864         }
2865
2866         case IOC_LIBCFS_LNET_DIST:
2867                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
2868                 if (rc < 0 && rc != -EHOSTUNREACH)
2869                         return rc;
2870
2871                 data->ioc_u32[0] = rc;
2872                 return 0;
2873
2874         case IOC_LIBCFS_TESTPROTOCOMPAT:
2875                 lnet_net_lock(LNET_LOCK_EX);
2876                 the_lnet.ln_testprotocompat = data->ioc_flags;
2877                 lnet_net_unlock(LNET_LOCK_EX);
2878                 return 0;
2879
2880         case IOC_LIBCFS_LNET_FAULT:
2881                 return lnet_fault_ctl(data->ioc_flags, data);
2882
2883         case IOC_LIBCFS_PING: {
2884                 signed long timeout;
2885
2886                 id.nid = data->ioc_nid;
2887                 id.pid = data->ioc_u32[0];
2888
2889                 /* Don't block longer than 2 minutes */
2890                 if (data->ioc_u32[1] > 120 * MSEC_PER_SEC)
2891                         return -EINVAL;
2892
2893                 /* If timestamp is negative then disable timeout */
2894                 if ((s32)data->ioc_u32[1] < 0)
2895                         timeout = MAX_SCHEDULE_TIMEOUT;
2896                 else
2897                         timeout = msecs_to_jiffies(data->ioc_u32[1]);
2898
2899                 rc = lnet_ping(id, timeout, data->ioc_pbuf1,
2900                                data->ioc_plen1 / sizeof(struct lnet_process_id));
2901                 if (rc < 0)
2902                         return rc;
2903                 data->ioc_count = rc;
2904                 return 0;
2905         }
2906
2907         default:
2908                 ni = lnet_net2ni_addref(data->ioc_net);
2909                 if (ni == NULL)
2910                         return -EINVAL;
2911
2912                 if (ni->ni_net->net_lnd->lnd_ctl == NULL)
2913                         rc = -EINVAL;
2914                 else
2915                         rc = ni->ni_net->net_lnd->lnd_ctl(ni, cmd, arg);
2916
2917                 lnet_ni_decref(ni);
2918                 return rc;
2919         }
2920         /* not reached */
2921 }
2922 EXPORT_SYMBOL(LNetCtl);
2923
2924 void LNetDebugPeer(struct lnet_process_id id)
2925 {
2926         lnet_debug_peer(id.nid);
2927 }
2928 EXPORT_SYMBOL(LNetDebugPeer);
2929
2930 /**
2931  * Retrieve the struct lnet_process_id ID of LNet interface at \a index.
2932  * Note that all interfaces share a same PID, as requested by LNetNIInit().
2933  *
2934  * \param index Index of the interface to look up.
2935  * \param id On successful return, this location will hold the
2936  * struct lnet_process_id ID of the interface.
2937  *
2938  * \retval 0 If an interface exists at \a index.
2939  * \retval -ENOENT If no interface has been found.
2940  */
2941 int
2942 LNetGetId(unsigned int index, struct lnet_process_id *id)
2943 {
2944         struct lnet_ni   *ni;
2945         struct lnet_net  *net;
2946         int               cpt;
2947         int               rc = -ENOENT;
2948
2949         LASSERT(the_lnet.ln_refcount > 0);
2950
2951         cpt = lnet_net_lock_current();
2952
2953         list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
2954                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
2955                         if (index-- != 0)
2956                                 continue;
2957
2958                         id->nid = ni->ni_nid;
2959                         id->pid = the_lnet.ln_pid;
2960                         rc = 0;
2961                         break;
2962                 }
2963         }
2964
2965         lnet_net_unlock(cpt);
2966         return rc;
2967 }
2968 EXPORT_SYMBOL(LNetGetId);
2969
2970 static int lnet_ping(struct lnet_process_id id, signed long timeout,
2971                      struct lnet_process_id __user *ids, int n_ids)
2972 {
2973         struct lnet_handle_eq eqh;
2974         struct lnet_handle_md mdh;
2975         struct lnet_event event;
2976         struct lnet_md md = { NULL };
2977         int                  which;
2978         int                  unlinked = 0;
2979         int                  replied = 0;
2980         const signed long a_long_time = msecs_to_jiffies(60 * MSEC_PER_SEC);
2981         int                  infosz;
2982         struct lnet_ping_info *info;
2983         struct lnet_process_id tmpid;
2984         int                  i;
2985         int                  nob;
2986         int                  rc;
2987         int                  rc2;
2988         sigset_t         blocked;
2989
2990         infosz = offsetof(struct lnet_ping_info, pi_ni[n_ids]);
2991
2992         /* n_ids limit is arbitrary */
2993         if (n_ids <= 0 || n_ids > 20 || id.nid == LNET_NID_ANY)
2994                 return -EINVAL;
2995
2996         if (id.pid == LNET_PID_ANY)
2997                 id.pid = LNET_PID_LUSTRE;
2998
2999         LIBCFS_ALLOC(info, infosz);
3000         if (info == NULL)
3001                 return -ENOMEM;
3002
3003         /* NB 2 events max (including any unlink event) */
3004         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
3005         if (rc != 0) {
3006                 CERROR("Can't allocate EQ: %d\n", rc);
3007                 goto out_0;
3008         }
3009
3010         /* initialize md content */
3011         md.start     = info;
3012         md.length    = infosz;
3013         md.threshold = 2; /*GET/REPLY*/
3014         md.max_size  = 0;
3015         md.options   = LNET_MD_TRUNCATE;
3016         md.user_ptr  = NULL;
3017         md.eq_handle = eqh;
3018
3019         rc = LNetMDBind(md, LNET_UNLINK, &mdh);
3020         if (rc != 0) {
3021                 CERROR("Can't bind MD: %d\n", rc);
3022                 goto out_1;
3023         }
3024
3025         rc = LNetGet(LNET_NID_ANY, mdh, id,
3026                      LNET_RESERVED_PORTAL,
3027                      LNET_PROTO_PING_MATCHBITS, 0);
3028
3029         if (rc != 0) {
3030                 /* Don't CERROR; this could be deliberate! */
3031
3032                 rc2 = LNetMDUnlink(mdh);
3033                 LASSERT(rc2 == 0);
3034
3035                 /* NB must wait for the UNLINK event below... */
3036                 unlinked = 1;
3037                 timeout = a_long_time;
3038         }
3039
3040         do {
3041                 /* MUST block for unlink to complete */
3042                 if (unlinked)
3043                         blocked = cfs_block_allsigs();
3044
3045                 rc2 = LNetEQPoll(&eqh, 1, timeout, &event, &which);
3046
3047                 if (unlinked)
3048                         cfs_restore_sigs(blocked);
3049
3050                 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
3051                        (rc2 <= 0) ? -1 : event.type,
3052                        (rc2 <= 0) ? -1 : event.status,
3053                        (rc2 > 0 && event.unlinked) ? " unlinked" : "");
3054
3055                 LASSERT(rc2 != -EOVERFLOW);     /* can't miss anything */
3056
3057                 if (rc2 <= 0 || event.status != 0) {
3058                         /* timeout or error */
3059                         if (!replied && rc == 0)
3060                                 rc = (rc2 < 0) ? rc2 :
3061                                      (rc2 == 0) ? -ETIMEDOUT :
3062                                      event.status;
3063
3064                         if (!unlinked) {
3065                                 /* Ensure completion in finite time... */
3066                                 LNetMDUnlink(mdh);
3067                                 /* No assertion (racing with network) */
3068                                 unlinked = 1;
3069                                 timeout = a_long_time;
3070                         } else if (rc2 == 0) {
3071                                 /* timed out waiting for unlink */
3072                                 CWARN("ping %s: late network completion\n",
3073                                       libcfs_id2str(id));
3074                         }
3075                 } else if (event.type == LNET_EVENT_REPLY) {
3076                         replied = 1;
3077                         rc = event.mlength;
3078                 }
3079
3080         } while (rc2 <= 0 || !event.unlinked);
3081
3082         if (!replied) {
3083                 if (rc >= 0)
3084                         CWARN("%s: Unexpected rc >= 0 but no reply!\n",
3085                               libcfs_id2str(id));
3086                 rc = -EIO;
3087                 goto out_1;
3088         }
3089
3090         nob = rc;
3091         LASSERT(nob >= 0 && nob <= infosz);
3092
3093         rc = -EPROTO;                           /* if I can't parse... */
3094
3095         if (nob < 8) {
3096                 /* can't check magic/version */
3097                 CERROR("%s: ping info too short %d\n",
3098                        libcfs_id2str(id), nob);
3099                 goto out_1;
3100         }
3101
3102         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
3103                 lnet_swap_pinginfo(info);
3104         } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
3105                 CERROR("%s: Unexpected magic %08x\n",
3106                        libcfs_id2str(id), info->pi_magic);
3107                 goto out_1;
3108         }
3109
3110         if ((info->pi_features & LNET_PING_FEAT_NI_STATUS) == 0) {
3111                 CERROR("%s: ping w/o NI status: 0x%x\n",
3112                        libcfs_id2str(id), info->pi_features);
3113                 goto out_1;
3114         }
3115
3116         if (nob < offsetof(struct lnet_ping_info, pi_ni[0])) {
3117                 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
3118                        nob, (int)offsetof(struct lnet_ping_info, pi_ni[0]));
3119                 goto out_1;
3120         }
3121
3122         if (info->pi_nnis < n_ids)
3123                 n_ids = info->pi_nnis;
3124
3125         if (nob < offsetof(struct lnet_ping_info, pi_ni[n_ids])) {
3126                 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
3127                        nob, (int)offsetof(struct lnet_ping_info, pi_ni[n_ids]));
3128                 goto out_1;
3129         }
3130
3131         rc = -EFAULT;                           /* If I SEGV... */
3132
3133         memset(&tmpid, 0, sizeof(tmpid));
3134         for (i = 0; i < n_ids; i++) {
3135                 tmpid.pid = info->pi_pid;
3136                 tmpid.nid = info->pi_ni[i].ns_nid;
3137                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
3138                         goto out_1;
3139         }
3140         rc = info->pi_nnis;
3141
3142  out_1:
3143         rc2 = LNetEQFree(eqh);
3144         if (rc2 != 0)
3145                 CERROR("rc2 %d\n", rc2);
3146         LASSERT(rc2 == 0);
3147
3148  out_0:
3149         LIBCFS_FREE(info, infosz);
3150         return rc;
3151 }