drivers/staging/lustre/lnet/lnet/api-ni.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.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, 2015, 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 <linux/lnet/lib-lnet.h>
  38 #include <uapi/linux/lnet/lnet-dlc.h>
  39
  40 #define D_LNI D_CONSOLE
  41
  42 struct lnet the_lnet;           /* THE state of the network */
  43 EXPORT_SYMBOL(the_lnet);
  44
  45 static char *ip2nets = "";
  46 module_param(ip2nets, charp, 0444);
  47 MODULE_PARM_DESC(ip2nets, "LNET network <- IP table");
  48
  49 static char *networks = "";
  50 module_param(networks, charp, 0444);
  51 MODULE_PARM_DESC(networks, "local networks");
  52
  53 static char *routes = "";
  54 module_param(routes, charp, 0444);
  55 MODULE_PARM_DESC(routes, "routes to non-local networks");
  56
  57 static int rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
  58 module_param(rnet_htable_size, int, 0444);
  59 MODULE_PARM_DESC(rnet_htable_size, "size of remote network hash table");
  60
  61 static int lnet_ping(struct lnet_process_id id, int timeout_ms,
  62                      struct lnet_process_id __user *ids, int n_ids);
  63
  64 static char *
  65 lnet_get_routes(void)
  66 {
  67         return routes;
  68 }
  69
  70 static char *
  71 lnet_get_networks(void)
  72 {
  73         char *nets;
  74         int rc;
  75
  76         if (*networks && *ip2nets) {
  77                 LCONSOLE_ERROR_MSG(0x101, "Please specify EITHER 'networks' or 'ip2nets' but not both at once\n");
  78                 return NULL;
  79         }
  80
  81         if (*ip2nets) {
  82                 rc = lnet_parse_ip2nets(&nets, ip2nets);
  83                 return !rc ? nets : NULL;
  84         }
  85
  86         if (*networks)
  87                 return networks;
  88
  89         return "tcp";
  90 }
  91
  92 static void
  93 lnet_init_locks(void)
  94 {
  95         spin_lock_init(&the_lnet.ln_eq_wait_lock);
  96         init_waitqueue_head(&the_lnet.ln_eq_waitq);
  97         init_waitqueue_head(&the_lnet.ln_rc_waitq);
  98         mutex_init(&the_lnet.ln_lnd_mutex);
  99         mutex_init(&the_lnet.ln_api_mutex);
 100 }
 101
 102 static int
 103 lnet_create_remote_nets_table(void)
 104 {
 105         int i;
 106         struct list_head *hash;
 107
 108         LASSERT(!the_lnet.ln_remote_nets_hash);
 109         LASSERT(the_lnet.ln_remote_nets_hbits > 0);
 110         LIBCFS_ALLOC(hash, LNET_REMOTE_NETS_HASH_SIZE * sizeof(*hash));
 111         if (!hash) {
 112                 CERROR("Failed to create remote nets hash table\n");
 113                 return -ENOMEM;
 114         }
 115
 116         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 117                 INIT_LIST_HEAD(&hash[i]);
 118         the_lnet.ln_remote_nets_hash = hash;
 119         return 0;
 120 }
 121
 122 static void
 123 lnet_destroy_remote_nets_table(void)
 124 {
 125         int i;
 126
 127         if (!the_lnet.ln_remote_nets_hash)
 128                 return;
 129
 130         for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++)
 131                 LASSERT(list_empty(&the_lnet.ln_remote_nets_hash[i]));
 132
 133         LIBCFS_FREE(the_lnet.ln_remote_nets_hash,
 134                     LNET_REMOTE_NETS_HASH_SIZE *
 135                     sizeof(the_lnet.ln_remote_nets_hash[0]));
 136         the_lnet.ln_remote_nets_hash = NULL;
 137 }
 138
 139 static void
 140 lnet_destroy_locks(void)
 141 {
 142         if (the_lnet.ln_res_lock) {
 143                 cfs_percpt_lock_free(the_lnet.ln_res_lock);
 144                 the_lnet.ln_res_lock = NULL;
 145         }
 146
 147         if (the_lnet.ln_net_lock) {
 148                 cfs_percpt_lock_free(the_lnet.ln_net_lock);
 149                 the_lnet.ln_net_lock = NULL;
 150         }
 151 }
 152
 153 static int
 154 lnet_create_locks(void)
 155 {
 156         lnet_init_locks();
 157
 158         the_lnet.ln_res_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 159         if (!the_lnet.ln_res_lock)
 160                 goto failed;
 161
 162         the_lnet.ln_net_lock = cfs_percpt_lock_alloc(lnet_cpt_table());
 163         if (!the_lnet.ln_net_lock)
 164                 goto failed;
 165
 166         return 0;
 167
 168  failed:
 169         lnet_destroy_locks();
 170         return -ENOMEM;
 171 }
 172
 173 static void lnet_assert_wire_constants(void)
 174 {
 175         /*
 176          * Wire protocol assertions generated by 'wirecheck'
 177          * running on Linux robert.bartonsoftware.com 2.6.8-1.521
 178          * #1 Mon Aug 16 09:01:18 EDT 2004 i686 athlon i386 GNU/Linux
 179          * with gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7)
 180          */
 181
 182         /* Constants... */
 183         BUILD_BUG_ON(LNET_PROTO_TCP_MAGIC != 0xeebc0ded);
 184         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MAJOR != 1);
 185         BUILD_BUG_ON(LNET_PROTO_TCP_VERSION_MINOR != 0);
 186         BUILD_BUG_ON(LNET_MSG_ACK != 0);
 187         BUILD_BUG_ON(LNET_MSG_PUT != 1);
 188         BUILD_BUG_ON(LNET_MSG_GET != 2);
 189         BUILD_BUG_ON(LNET_MSG_REPLY != 3);
 190         BUILD_BUG_ON(LNET_MSG_HELLO != 4);
 191
 192         /* Checks for struct ptl_handle_wire_t */
 193         BUILD_BUG_ON((int)sizeof(struct lnet_handle_wire) != 16);
 194         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire, wh_interface_cookie) != 0);
 195         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_interface_cookie) != 8);
 196         BUILD_BUG_ON((int)offsetof(struct lnet_handle_wire, wh_object_cookie) != 8);
 197         BUILD_BUG_ON((int)sizeof(((struct lnet_handle_wire *)0)->wh_object_cookie) != 8);
 198
 199         /* Checks for struct struct lnet_magicversion */
 200         BUILD_BUG_ON((int)sizeof(struct lnet_magicversion) != 8);
 201         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, magic) != 0);
 202         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->magic) != 4);
 203         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, version_major) != 4);
 204         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_major) != 2);
 205         BUILD_BUG_ON((int)offsetof(struct lnet_magicversion, version_minor) != 6);
 206         BUILD_BUG_ON((int)sizeof(((struct lnet_magicversion *)0)->version_minor) != 2);
 207
 208         /* Checks for struct struct lnet_hdr */
 209         BUILD_BUG_ON((int)sizeof(struct lnet_hdr) != 72);
 210         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_nid) != 0);
 211         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_nid) != 8);
 212         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_nid) != 8);
 213         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_nid) != 8);
 214         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, dest_pid) != 16);
 215         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->dest_pid) != 4);
 216         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, src_pid) != 20);
 217         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->src_pid) != 4);
 218         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, type) != 24);
 219         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->type) != 4);
 220         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, payload_length) != 28);
 221         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->payload_length) != 4);
 222         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg) != 32);
 223         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg) != 40);
 224
 225         /* Ack */
 226         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.dst_wmd) != 32);
 227         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.dst_wmd) != 16);
 228         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.match_bits) != 48);
 229         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.match_bits) != 8);
 230         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.ack.mlength) != 56);
 231         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.ack.mlength) != 4);
 232
 233         /* Put */
 234         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ack_wmd) != 32);
 235         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ack_wmd) != 16);
 236         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.match_bits) != 48);
 237         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.match_bits) != 8);
 238         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.hdr_data) != 56);
 239         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.hdr_data) != 8);
 240         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.ptl_index) != 64);
 241         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.ptl_index) != 4);
 242         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.put.offset) != 68);
 243         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.put.offset) != 4);
 244
 245         /* Get */
 246         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.return_wmd) != 32);
 247         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.return_wmd) != 16);
 248         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.match_bits) != 48);
 249         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.match_bits) != 8);
 250         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.ptl_index) != 56);
 251         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.ptl_index) != 4);
 252         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.src_offset) != 60);
 253         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.src_offset) != 4);
 254         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.get.sink_length) != 64);
 255         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.get.sink_length) != 4);
 256
 257         /* Reply */
 258         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.reply.dst_wmd) != 32);
 259         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.reply.dst_wmd) != 16);
 260
 261         /* Hello */
 262         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.incarnation) != 32);
 263         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.incarnation) != 8);
 264         BUILD_BUG_ON((int)offsetof(struct lnet_hdr, msg.hello.type) != 40);
 265         BUILD_BUG_ON((int)sizeof(((struct lnet_hdr *)0)->msg.hello.type) != 4);
 266 }
 267
 268 static struct lnet_lnd *
 269 lnet_find_lnd_by_type(__u32 type)
 270 {
 271         struct lnet_lnd *lnd;
 272         struct list_head *tmp;
 273
 274         /* holding lnd mutex */
 275         list_for_each(tmp, &the_lnet.ln_lnds) {
 276                 lnd = list_entry(tmp, struct lnet_lnd, lnd_list);
 277
 278                 if (lnd->lnd_type == type)
 279                         return lnd;
 280         }
 281
 282         return NULL;
 283 }
 284
 285 void
 286 lnet_register_lnd(struct lnet_lnd *lnd)
 287 {
 288         mutex_lock(&the_lnet.ln_lnd_mutex);
 289
 290         LASSERT(libcfs_isknown_lnd(lnd->lnd_type));
 291         LASSERT(!lnet_find_lnd_by_type(lnd->lnd_type));
 292
 293         list_add_tail(&lnd->lnd_list, &the_lnet.ln_lnds);
 294         lnd->lnd_refcount = 0;
 295
 296         CDEBUG(D_NET, "%s LND registered\n", libcfs_lnd2str(lnd->lnd_type));
 297
 298         mutex_unlock(&the_lnet.ln_lnd_mutex);
 299 }
 300 EXPORT_SYMBOL(lnet_register_lnd);
 301
 302 void
 303 lnet_unregister_lnd(struct lnet_lnd *lnd)
 304 {
 305         mutex_lock(&the_lnet.ln_lnd_mutex);
 306
 307         LASSERT(lnet_find_lnd_by_type(lnd->lnd_type) == lnd);
 308         LASSERT(!lnd->lnd_refcount);
 309
 310         list_del(&lnd->lnd_list);
 311         CDEBUG(D_NET, "%s LND unregistered\n", libcfs_lnd2str(lnd->lnd_type));
 312
 313         mutex_unlock(&the_lnet.ln_lnd_mutex);
 314 }
 315 EXPORT_SYMBOL(lnet_unregister_lnd);
 316
 317 void
 318 lnet_counters_get(struct lnet_counters *counters)
 319 {
 320         struct lnet_counters *ctr;
 321         int i;
 322
 323         memset(counters, 0, sizeof(*counters));
 324
 325         lnet_net_lock(LNET_LOCK_EX);
 326
 327         cfs_percpt_for_each(ctr, i, the_lnet.ln_counters) {
 328                 counters->msgs_max     += ctr->msgs_max;
 329                 counters->msgs_alloc   += ctr->msgs_alloc;
 330                 counters->errors       += ctr->errors;
 331                 counters->send_count   += ctr->send_count;
 332                 counters->recv_count   += ctr->recv_count;
 333                 counters->route_count  += ctr->route_count;
 334                 counters->drop_count   += ctr->drop_count;
 335                 counters->send_length  += ctr->send_length;
 336                 counters->recv_length  += ctr->recv_length;
 337                 counters->route_length += ctr->route_length;
 338                 counters->drop_length  += ctr->drop_length;
 339         }
 340         lnet_net_unlock(LNET_LOCK_EX);
 341 }
 342 EXPORT_SYMBOL(lnet_counters_get);
 343
 344 void
 345 lnet_counters_reset(void)
 346 {
 347         struct lnet_counters *counters;
 348         int i;
 349
 350         lnet_net_lock(LNET_LOCK_EX);
 351
 352         cfs_percpt_for_each(counters, i, the_lnet.ln_counters)
 353                 memset(counters, 0, sizeof(struct lnet_counters));
 354
 355         lnet_net_unlock(LNET_LOCK_EX);
 356 }
 357
 358 static char *
 359 lnet_res_type2str(int type)
 360 {
 361         switch (type) {
 362         default:
 363                 LBUG();
 364         case LNET_COOKIE_TYPE_MD:
 365                 return "MD";
 366         case LNET_COOKIE_TYPE_ME:
 367                 return "ME";
 368         case LNET_COOKIE_TYPE_EQ:
 369                 return "EQ";
 370         }
 371 }
 372
 373 static void
 374 lnet_res_container_cleanup(struct lnet_res_container *rec)
 375 {
 376         int count = 0;
 377
 378         if (!rec->rec_type) /* not set yet, it's uninitialized */
 379                 return;
 380
 381         while (!list_empty(&rec->rec_active)) {
 382                 struct list_head *e = rec->rec_active.next;
 383
 384                 list_del_init(e);
 385                 if (rec->rec_type == LNET_COOKIE_TYPE_EQ) {
 386                         lnet_eq_free(list_entry(e, struct lnet_eq, eq_list));
 387
 388                 } else if (rec->rec_type == LNET_COOKIE_TYPE_MD) {
 389                         lnet_md_free(list_entry(e, struct lnet_libmd, md_list));
 390
 391                 } else { /* NB: Active MEs should be attached on portals */
 392                         LBUG();
 393                 }
 394                 count++;
 395         }
 396
 397         if (count > 0) {
 398                 /*
 399                  * Found alive MD/ME/EQ, user really should unlink/free
 400                  * all of them before finalize LNet, but if someone didn't,
 401                  * we have to recycle garbage for him
 402                  */
 403                 CERROR("%d active elements on exit of %s container\n",
 404                        count, lnet_res_type2str(rec->rec_type));
 405         }
 406
 407         if (rec->rec_lh_hash) {
 408                 LIBCFS_FREE(rec->rec_lh_hash,
 409                             LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 410                 rec->rec_lh_hash = NULL;
 411         }
 412
 413         rec->rec_type = 0; /* mark it as finalized */
 414 }
 415
 416 static int
 417 lnet_res_container_setup(struct lnet_res_container *rec, int cpt, int type)
 418 {
 419         int rc = 0;
 420         int i;
 421
 422         LASSERT(!rec->rec_type);
 423
 424         rec->rec_type = type;
 425         INIT_LIST_HEAD(&rec->rec_active);
 426         rec->rec_lh_cookie = (cpt << LNET_COOKIE_TYPE_BITS) | type;
 427
 428         /* Arbitrary choice of hash table size */
 429         LIBCFS_CPT_ALLOC(rec->rec_lh_hash, lnet_cpt_table(), cpt,
 430                          LNET_LH_HASH_SIZE * sizeof(rec->rec_lh_hash[0]));
 431         if (!rec->rec_lh_hash) {
 432                 rc = -ENOMEM;
 433                 goto out;
 434         }
 435
 436         for (i = 0; i < LNET_LH_HASH_SIZE; i++)
 437                 INIT_LIST_HEAD(&rec->rec_lh_hash[i]);
 438
 439         return 0;
 440
 441 out:
 442         CERROR("Failed to setup %s resource container\n",
 443                lnet_res_type2str(type));
 444         lnet_res_container_cleanup(rec);
 445         return rc;
 446 }
 447
 448 static void
 449 lnet_res_containers_destroy(struct lnet_res_container **recs)
 450 {
 451         struct lnet_res_container *rec;
 452         int i;
 453
 454         cfs_percpt_for_each(rec, i, recs)
 455                 lnet_res_container_cleanup(rec);
 456
 457         cfs_percpt_free(recs);
 458 }
 459
 460 static struct lnet_res_container **
 461 lnet_res_containers_create(int type)
 462 {
 463         struct lnet_res_container **recs;
 464         struct lnet_res_container *rec;
 465         int rc;
 466         int i;
 467
 468         recs = cfs_percpt_alloc(lnet_cpt_table(), sizeof(*rec));
 469         if (!recs) {
 470                 CERROR("Failed to allocate %s resource containers\n",
 471                        lnet_res_type2str(type));
 472                 return NULL;
 473         }
 474
 475         cfs_percpt_for_each(rec, i, recs) {
 476                 rc = lnet_res_container_setup(rec, i, type);
 477                 if (rc) {
 478                         lnet_res_containers_destroy(recs);
 479                         return NULL;
 480                 }
 481         }
 482
 483         return recs;
 484 }
 485
 486 struct lnet_libhandle *
 487 lnet_res_lh_lookup(struct lnet_res_container *rec, __u64 cookie)
 488 {
 489         /* ALWAYS called with lnet_res_lock held */
 490         struct list_head *head;
 491         struct lnet_libhandle *lh;
 492         unsigned int hash;
 493
 494         if ((cookie & LNET_COOKIE_MASK) != rec->rec_type)
 495                 return NULL;
 496
 497         hash = cookie >> (LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS);
 498         head = &rec->rec_lh_hash[hash & LNET_LH_HASH_MASK];
 499
 500         list_for_each_entry(lh, head, lh_hash_chain) {
 501                 if (lh->lh_cookie == cookie)
 502                         return lh;
 503         }
 504
 505         return NULL;
 506 }
 507
 508 void
 509 lnet_res_lh_initialize(struct lnet_res_container *rec,
 510                        struct lnet_libhandle *lh)
 511 {
 512         /* ALWAYS called with lnet_res_lock held */
 513         unsigned int ibits = LNET_COOKIE_TYPE_BITS + LNET_CPT_BITS;
 514         unsigned int hash;
 515
 516         lh->lh_cookie = rec->rec_lh_cookie;
 517         rec->rec_lh_cookie += 1 << ibits;
 518
 519         hash = (lh->lh_cookie >> ibits) & LNET_LH_HASH_MASK;
 520
 521         list_add(&lh->lh_hash_chain, &rec->rec_lh_hash[hash]);
 522 }
 523
 524 static int lnet_unprepare(void);
 525
 526 static int
 527 lnet_prepare(lnet_pid_t requested_pid)
 528 {
 529         /* Prepare to bring up the network */
 530         struct lnet_res_container **recs;
 531         int rc = 0;
 532
 533         if (requested_pid == LNET_PID_ANY) {
 534                 /* Don't instantiate LNET just for me */
 535                 return -ENETDOWN;
 536         }
 537
 538         LASSERT(!the_lnet.ln_refcount);
 539
 540         the_lnet.ln_routing = 0;
 541
 542         LASSERT(!(requested_pid & LNET_PID_USERFLAG));
 543         the_lnet.ln_pid = requested_pid;
 544
 545         INIT_LIST_HEAD(&the_lnet.ln_test_peers);
 546         INIT_LIST_HEAD(&the_lnet.ln_nis);
 547         INIT_LIST_HEAD(&the_lnet.ln_nis_cpt);
 548         INIT_LIST_HEAD(&the_lnet.ln_nis_zombie);
 549         INIT_LIST_HEAD(&the_lnet.ln_routers);
 550         INIT_LIST_HEAD(&the_lnet.ln_drop_rules);
 551         INIT_LIST_HEAD(&the_lnet.ln_delay_rules);
 552
 553         rc = lnet_create_remote_nets_table();
 554         if (rc)
 555                 goto failed;
 556         /*
 557          * NB the interface cookie in wire handles guards against delayed
 558          * replies and ACKs appearing valid after reboot.
 559          */
 560         the_lnet.ln_interface_cookie = ktime_get_ns();
 561
 562         the_lnet.ln_counters = cfs_percpt_alloc(lnet_cpt_table(),
 563                                                 sizeof(struct lnet_counters));
 564         if (!the_lnet.ln_counters) {
 565                 CERROR("Failed to allocate counters for LNet\n");
 566                 rc = -ENOMEM;
 567                 goto failed;
 568         }
 569
 570         rc = lnet_peer_tables_create();
 571         if (rc)
 572                 goto failed;
 573
 574         rc = lnet_msg_containers_create();
 575         if (rc)
 576                 goto failed;
 577
 578         rc = lnet_res_container_setup(&the_lnet.ln_eq_container, 0,
 579                                       LNET_COOKIE_TYPE_EQ);
 580         if (rc)
 581                 goto failed;
 582
 583         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_ME);
 584         if (!recs) {
 585                 rc = -ENOMEM;
 586                 goto failed;
 587         }
 588
 589         the_lnet.ln_me_containers = recs;
 590
 591         recs = lnet_res_containers_create(LNET_COOKIE_TYPE_MD);
 592         if (!recs) {
 593                 rc = -ENOMEM;
 594                 goto failed;
 595         }
 596
 597         the_lnet.ln_md_containers = recs;
 598
 599         rc = lnet_portals_create();
 600         if (rc) {
 601                 CERROR("Failed to create portals for LNet: %d\n", rc);
 602                 goto failed;
 603         }
 604
 605         return 0;
 606
 607  failed:
 608         lnet_unprepare();
 609         return rc;
 610 }
 611
 612 static int
 613 lnet_unprepare(void)
 614 {
 615         /*
 616          * NB no LNET_LOCK since this is the last reference.  All LND instances
 617          * have shut down already, so it is safe to unlink and free all
 618          * descriptors, even those that appear committed to a network op (eg MD
 619          * with non-zero pending count)
 620          */
 621         lnet_fail_nid(LNET_NID_ANY, 0);
 622
 623         LASSERT(!the_lnet.ln_refcount);
 624         LASSERT(list_empty(&the_lnet.ln_test_peers));
 625         LASSERT(list_empty(&the_lnet.ln_nis));
 626         LASSERT(list_empty(&the_lnet.ln_nis_cpt));
 627         LASSERT(list_empty(&the_lnet.ln_nis_zombie));
 628
 629         lnet_portals_destroy();
 630
 631         if (the_lnet.ln_md_containers) {
 632                 lnet_res_containers_destroy(the_lnet.ln_md_containers);
 633                 the_lnet.ln_md_containers = NULL;
 634         }
 635
 636         if (the_lnet.ln_me_containers) {
 637                 lnet_res_containers_destroy(the_lnet.ln_me_containers);
 638                 the_lnet.ln_me_containers = NULL;
 639         }
 640
 641         lnet_res_container_cleanup(&the_lnet.ln_eq_container);
 642
 643         lnet_msg_containers_destroy();
 644         lnet_peer_tables_destroy();
 645         lnet_rtrpools_free(0);
 646
 647         if (the_lnet.ln_counters) {
 648                 cfs_percpt_free(the_lnet.ln_counters);
 649                 the_lnet.ln_counters = NULL;
 650         }
 651         lnet_destroy_remote_nets_table();
 652
 653         return 0;
 654 }
 655
 656 struct lnet_ni  *
 657 lnet_net2ni_locked(__u32 net, int cpt)
 658 {
 659         struct list_head *tmp;
 660         struct lnet_ni *ni;
 661
 662         LASSERT(cpt != LNET_LOCK_EX);
 663
 664         list_for_each(tmp, &the_lnet.ln_nis) {
 665                 ni = list_entry(tmp, struct lnet_ni, ni_list);
 666
 667                 if (LNET_NIDNET(ni->ni_nid) == net) {
 668                         lnet_ni_addref_locked(ni, cpt);
 669                         return ni;
 670                 }
 671         }
 672
 673         return NULL;
 674 }
 675
 676 struct lnet_ni *
 677 lnet_net2ni(__u32 net)
 678 {
 679         struct lnet_ni *ni;
 680
 681         lnet_net_lock(0);
 682         ni = lnet_net2ni_locked(net, 0);
 683         lnet_net_unlock(0);
 684
 685         return ni;
 686 }
 687 EXPORT_SYMBOL(lnet_net2ni);
 688
 689 static unsigned int
 690 lnet_nid_cpt_hash(lnet_nid_t nid, unsigned int number)
 691 {
 692         __u64 key = nid;
 693         unsigned int val;
 694
 695         LASSERT(number >= 1 && number <= LNET_CPT_NUMBER);
 696
 697         if (number == 1)
 698                 return 0;
 699
 700         val = hash_long(key, LNET_CPT_BITS);
 701         /* NB: LNET_CP_NUMBER doesn't have to be PO2 */
 702         if (val < number)
 703                 return val;
 704
 705         return (unsigned int)(key + val + (val >> 1)) % number;
 706 }
 707
 708 int
 709 lnet_cpt_of_nid_locked(lnet_nid_t nid)
 710 {
 711         struct lnet_ni *ni;
 712
 713         /* must called with hold of lnet_net_lock */
 714         if (LNET_CPT_NUMBER == 1)
 715                 return 0; /* the only one */
 716
 717         /* take lnet_net_lock(any) would be OK */
 718         if (!list_empty(&the_lnet.ln_nis_cpt)) {
 719                 list_for_each_entry(ni, &the_lnet.ln_nis_cpt, ni_cptlist) {
 720                         if (LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid))
 721                                 continue;
 722
 723                         LASSERT(ni->ni_cpts);
 724                         return ni->ni_cpts[lnet_nid_cpt_hash
 725                                            (nid, ni->ni_ncpts)];
 726                 }
 727         }
 728
 729         return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 730 }
 731
 732 int
 733 lnet_cpt_of_nid(lnet_nid_t nid)
 734 {
 735         int cpt;
 736         int cpt2;
 737
 738         if (LNET_CPT_NUMBER == 1)
 739                 return 0; /* the only one */
 740
 741         if (list_empty(&the_lnet.ln_nis_cpt))
 742                 return lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
 743
 744         cpt = lnet_net_lock_current();
 745         cpt2 = lnet_cpt_of_nid_locked(nid);
 746         lnet_net_unlock(cpt);
 747
 748         return cpt2;
 749 }
 750 EXPORT_SYMBOL(lnet_cpt_of_nid);
 751
 752 int
 753 lnet_islocalnet(__u32 net)
 754 {
 755         struct lnet_ni *ni;
 756         int cpt;
 757
 758         cpt = lnet_net_lock_current();
 759
 760         ni = lnet_net2ni_locked(net, cpt);
 761         if (ni)
 762                 lnet_ni_decref_locked(ni, cpt);
 763
 764         lnet_net_unlock(cpt);
 765
 766         return !!ni;
 767 }
 768
 769 struct lnet_ni  *
 770 lnet_nid2ni_locked(lnet_nid_t nid, int cpt)
 771 {
 772         struct lnet_ni *ni;
 773         struct list_head *tmp;
 774
 775         LASSERT(cpt != LNET_LOCK_EX);
 776
 777         list_for_each(tmp, &the_lnet.ln_nis) {
 778                 ni = list_entry(tmp, struct lnet_ni, ni_list);
 779
 780                 if (ni->ni_nid == nid) {
 781                         lnet_ni_addref_locked(ni, cpt);
 782                         return ni;
 783                 }
 784         }
 785
 786         return NULL;
 787 }
 788
 789 int
 790 lnet_islocalnid(lnet_nid_t nid)
 791 {
 792         struct lnet_ni *ni;
 793         int cpt;
 794
 795         cpt = lnet_net_lock_current();
 796         ni = lnet_nid2ni_locked(nid, cpt);
 797         if (ni)
 798                 lnet_ni_decref_locked(ni, cpt);
 799         lnet_net_unlock(cpt);
 800
 801         return !!ni;
 802 }
 803
 804 int
 805 lnet_count_acceptor_nis(void)
 806 {
 807         /* Return the # of NIs that need the acceptor. */
 808         int count = 0;
 809         struct list_head *tmp;
 810         struct lnet_ni *ni;
 811         int cpt;
 812
 813         cpt = lnet_net_lock_current();
 814         list_for_each(tmp, &the_lnet.ln_nis) {
 815                 ni = list_entry(tmp, struct lnet_ni, ni_list);
 816
 817                 if (ni->ni_lnd->lnd_accept)
 818                         count++;
 819         }
 820
 821         lnet_net_unlock(cpt);
 822
 823         return count;
 824 }
 825
 826 static struct lnet_ping_info *
 827 lnet_ping_info_create(int num_ni)
 828 {
 829         struct lnet_ping_info *ping_info;
 830         unsigned int infosz;
 831
 832         infosz = offsetof(struct lnet_ping_info, pi_ni[num_ni]);
 833         LIBCFS_ALLOC(ping_info, infosz);
 834         if (!ping_info) {
 835                 CERROR("Can't allocate ping info[%d]\n", num_ni);
 836                 return NULL;
 837         }
 838
 839         ping_info->pi_nnis = num_ni;
 840         ping_info->pi_pid = the_lnet.ln_pid;
 841         ping_info->pi_magic = LNET_PROTO_PING_MAGIC;
 842         ping_info->pi_features = LNET_PING_FEAT_NI_STATUS;
 843
 844         return ping_info;
 845 }
 846
 847 static inline int
 848 lnet_get_ni_count(void)
 849 {
 850         struct lnet_ni *ni;
 851         int count = 0;
 852
 853         lnet_net_lock(0);
 854
 855         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list)
 856                 count++;
 857
 858         lnet_net_unlock(0);
 859
 860         return count;
 861 }
 862
 863 static inline void
 864 lnet_ping_info_free(struct lnet_ping_info *pinfo)
 865 {
 866         LIBCFS_FREE(pinfo,
 867                     offsetof(struct lnet_ping_info,
 868                              pi_ni[pinfo->pi_nnis]));
 869 }
 870
 871 static void
 872 lnet_ping_info_destroy(void)
 873 {
 874         struct lnet_ni *ni;
 875
 876         lnet_net_lock(LNET_LOCK_EX);
 877
 878         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
 879                 lnet_ni_lock(ni);
 880                 ni->ni_status = NULL;
 881                 lnet_ni_unlock(ni);
 882         }
 883
 884         lnet_ping_info_free(the_lnet.ln_ping_info);
 885         the_lnet.ln_ping_info = NULL;
 886
 887         lnet_net_unlock(LNET_LOCK_EX);
 888 }
 889
 890 static void
 891 lnet_ping_event_handler(struct lnet_event *event)
 892 {
 893         struct lnet_ping_info *pinfo = event->md.user_ptr;
 894
 895         if (event->unlinked)
 896                 pinfo->pi_features = LNET_PING_FEAT_INVAL;
 897 }
 898
 899 static int
 900 lnet_ping_info_setup(struct lnet_ping_info **ppinfo,
 901                      struct lnet_handle_md *md_handle,
 902                      int ni_count, bool set_eq)
 903 {
 904         struct lnet_process_id id = {LNET_NID_ANY, LNET_PID_ANY};
 905         struct lnet_handle_me me_handle;
 906         struct lnet_md md = { NULL };
 907         int rc, rc2;
 908
 909         if (set_eq) {
 910                 rc = LNetEQAlloc(0, lnet_ping_event_handler,
 911                                  &the_lnet.ln_ping_target_eq);
 912                 if (rc) {
 913                         CERROR("Can't allocate ping EQ: %d\n", rc);
 914                         return rc;
 915                 }
 916         }
 917
 918         *ppinfo = lnet_ping_info_create(ni_count);
 919         if (!*ppinfo) {
 920                 rc = -ENOMEM;
 921                 goto failed_0;
 922         }
 923
 924         rc = LNetMEAttach(LNET_RESERVED_PORTAL, id,
 925                           LNET_PROTO_PING_MATCHBITS, 0,
 926                           LNET_UNLINK, LNET_INS_AFTER,
 927                           &me_handle);
 928         if (rc) {
 929                 CERROR("Can't create ping ME: %d\n", rc);
 930                 goto failed_1;
 931         }
 932
 933         /* initialize md content */
 934         md.start = *ppinfo;
 935         md.length = offsetof(struct lnet_ping_info,
 936                              pi_ni[(*ppinfo)->pi_nnis]);
 937         md.threshold = LNET_MD_THRESH_INF;
 938         md.max_size = 0;
 939         md.options = LNET_MD_OP_GET | LNET_MD_TRUNCATE |
 940                      LNET_MD_MANAGE_REMOTE;
 941         md.user_ptr  = NULL;
 942         md.eq_handle = the_lnet.ln_ping_target_eq;
 943         md.user_ptr = *ppinfo;
 944
 945         rc = LNetMDAttach(me_handle, md, LNET_RETAIN, md_handle);
 946         if (rc) {
 947                 CERROR("Can't attach ping MD: %d\n", rc);
 948                 goto failed_2;
 949         }
 950
 951         return 0;
 952
 953 failed_2:
 954         rc2 = LNetMEUnlink(me_handle);
 955         LASSERT(!rc2);
 956 failed_1:
 957         lnet_ping_info_free(*ppinfo);
 958         *ppinfo = NULL;
 959 failed_0:
 960         if (set_eq)
 961                 LNetEQFree(the_lnet.ln_ping_target_eq);
 962         return rc;
 963 }
 964
 965 static void
 966 lnet_ping_md_unlink(struct lnet_ping_info *pinfo,
 967                     struct lnet_handle_md *md_handle)
 968 {
 969         sigset_t blocked = cfs_block_allsigs();
 970
 971         LNetMDUnlink(*md_handle);
 972         LNetInvalidateMDHandle(md_handle);
 973
 974         /* NB md could be busy; this just starts the unlink */
 975         while (pinfo->pi_features != LNET_PING_FEAT_INVAL) {
 976                 CDEBUG(D_NET, "Still waiting for ping MD to unlink\n");
 977                 set_current_state(TASK_UNINTERRUPTIBLE);
 978                 schedule_timeout(cfs_time_seconds(1));
 979         }
 980
 981         cfs_restore_sigs(blocked);
 982 }
 983
 984 static void
 985 lnet_ping_info_install_locked(struct lnet_ping_info *ping_info)
 986 {
 987         struct lnet_ni_status *ns;
 988         struct lnet_ni *ni;
 989         int i = 0;
 990
 991         list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) {
 992                 LASSERT(i < ping_info->pi_nnis);
 993
 994                 ns = &ping_info->pi_ni[i];
 995
 996                 ns->ns_nid = ni->ni_nid;
 997
 998                 lnet_ni_lock(ni);
 999                 ns->ns_status = (ni->ni_status) ?
1000                                  ni->ni_status->ns_status : LNET_NI_STATUS_UP;
1001                 ni->ni_status = ns;
1002                 lnet_ni_unlock(ni);
1003
1004                 i++;
1005         }
1006 }
1007
1008 static void
1009 lnet_ping_target_update(struct lnet_ping_info *pinfo,
1010                         struct lnet_handle_md md_handle)
1011 {
1012         struct lnet_ping_info *old_pinfo = NULL;
1013         struct lnet_handle_md old_md;
1014
1015         /* switch the NIs to point to the new ping info created */
1016         lnet_net_lock(LNET_LOCK_EX);
1017
1018         if (!the_lnet.ln_routing)
1019                 pinfo->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
1020         lnet_ping_info_install_locked(pinfo);
1021
1022         if (the_lnet.ln_ping_info) {
1023                 old_pinfo = the_lnet.ln_ping_info;
1024                 old_md = the_lnet.ln_ping_target_md;
1025         }
1026         the_lnet.ln_ping_target_md = md_handle;
1027         the_lnet.ln_ping_info = pinfo;
1028
1029         lnet_net_unlock(LNET_LOCK_EX);
1030
1031         if (old_pinfo) {
1032                 /* unlink the old ping info */
1033                 lnet_ping_md_unlink(old_pinfo, &old_md);
1034                 lnet_ping_info_free(old_pinfo);
1035         }
1036 }
1037
1038 static void
1039 lnet_ping_target_fini(void)
1040 {
1041         int rc;
1042
1043         lnet_ping_md_unlink(the_lnet.ln_ping_info,
1044                             &the_lnet.ln_ping_target_md);
1045
1046         rc = LNetEQFree(the_lnet.ln_ping_target_eq);
1047         LASSERT(!rc);
1048
1049         lnet_ping_info_destroy();
1050 }
1051
1052 static int
1053 lnet_ni_tq_credits(struct lnet_ni *ni)
1054 {
1055         int credits;
1056
1057         LASSERT(ni->ni_ncpts >= 1);
1058
1059         if (ni->ni_ncpts == 1)
1060                 return ni->ni_maxtxcredits;
1061
1062         credits = ni->ni_maxtxcredits / ni->ni_ncpts;
1063         credits = max(credits, 8 * ni->ni_peertxcredits);
1064         credits = min(credits, ni->ni_maxtxcredits);
1065
1066         return credits;
1067 }
1068
1069 static void
1070 lnet_ni_unlink_locked(struct lnet_ni *ni)
1071 {
1072         if (!list_empty(&ni->ni_cptlist)) {
1073                 list_del_init(&ni->ni_cptlist);
1074                 lnet_ni_decref_locked(ni, 0);
1075         }
1076
1077         /* move it to zombie list and nobody can find it anymore */
1078         LASSERT(!list_empty(&ni->ni_list));
1079         list_move(&ni->ni_list, &the_lnet.ln_nis_zombie);
1080         lnet_ni_decref_locked(ni, 0);   /* drop ln_nis' ref */
1081 }
1082
1083 static void
1084 lnet_clear_zombies_nis_locked(void)
1085 {
1086         int i;
1087         int islo;
1088         struct lnet_ni *ni;
1089         struct lnet_ni *temp;
1090
1091         /*
1092          * Now wait for the NI's I just nuked to show up on ln_zombie_nis
1093          * and shut them down in guaranteed thread context
1094          */
1095         i = 2;
1096         list_for_each_entry_safe(ni, temp, &the_lnet.ln_nis_zombie, ni_list) {
1097                 int *ref;
1098                 int j;
1099
1100                 list_del_init(&ni->ni_list);
1101                 cfs_percpt_for_each(ref, j, ni->ni_refs) {
1102                         if (!*ref)
1103                                 continue;
1104                         /* still busy, add it back to zombie list */
1105                         list_add(&ni->ni_list, &the_lnet.ln_nis_zombie);
1106                         break;
1107                 }
1108
1109                 if (!list_empty(&ni->ni_list)) {
1110                         lnet_net_unlock(LNET_LOCK_EX);
1111                         ++i;
1112                         if ((i & (-i)) == i) {
1113                                 CDEBUG(D_WARNING, "Waiting for zombie LNI %s\n",
1114                                        libcfs_nid2str(ni->ni_nid));
1115                         }
1116                         set_current_state(TASK_UNINTERRUPTIBLE);
1117                         schedule_timeout(cfs_time_seconds(1));
1118                         lnet_net_lock(LNET_LOCK_EX);
1119                         continue;
1120                 }
1121
1122                 ni->ni_lnd->lnd_refcount--;
1123                 lnet_net_unlock(LNET_LOCK_EX);
1124
1125                 islo = ni->ni_lnd->lnd_type == LOLND;
1126
1127                 LASSERT(!in_interrupt());
1128                 ni->ni_lnd->lnd_shutdown(ni);
1129
1130                 /*
1131                  * can't deref lnd anymore now; it might have unregistered
1132                  * itself...
1133                  */
1134                 if (!islo)
1135                         CDEBUG(D_LNI, "Removed LNI %s\n",
1136                                libcfs_nid2str(ni->ni_nid));
1137
1138                 lnet_ni_free(ni);
1139                 i = 2;
1140
1141                 lnet_net_lock(LNET_LOCK_EX);
1142         }
1143 }
1144
1145 static void
1146 lnet_shutdown_lndnis(void)
1147 {
1148         struct lnet_ni *ni;
1149         struct lnet_ni *temp;
1150         int i;
1151
1152         /* NB called holding the global mutex */
1153
1154         /* All quiet on the API front */
1155         LASSERT(!the_lnet.ln_shutdown);
1156         LASSERT(!the_lnet.ln_refcount);
1157         LASSERT(list_empty(&the_lnet.ln_nis_zombie));
1158
1159         lnet_net_lock(LNET_LOCK_EX);
1160         the_lnet.ln_shutdown = 1;       /* flag shutdown */
1161
1162         /* Unlink NIs from the global table */
1163         list_for_each_entry_safe(ni, temp, &the_lnet.ln_nis, ni_list) {
1164                 lnet_ni_unlink_locked(ni);
1165         }
1166
1167         /* Drop the cached loopback NI. */
1168         if (the_lnet.ln_loni) {
1169                 lnet_ni_decref_locked(the_lnet.ln_loni, 0);
1170                 the_lnet.ln_loni = NULL;
1171         }
1172
1173         lnet_net_unlock(LNET_LOCK_EX);
1174
1175         /*
1176          * Clear lazy portals and drop delayed messages which hold refs
1177          * on their lnet_msg::msg_rxpeer
1178          */
1179         for (i = 0; i < the_lnet.ln_nportals; i++)
1180                 LNetClearLazyPortal(i);
1181
1182         /*
1183          * Clear the peer table and wait for all peers to go (they hold refs on
1184          * their NIs)
1185          */
1186         lnet_peer_tables_cleanup(NULL);
1187
1188         lnet_net_lock(LNET_LOCK_EX);
1189
1190         lnet_clear_zombies_nis_locked();
1191         the_lnet.ln_shutdown = 0;
1192         lnet_net_unlock(LNET_LOCK_EX);
1193 }
1194
1195 /* shutdown down the NI and release refcount */
1196 static void
1197 lnet_shutdown_lndni(struct lnet_ni *ni)
1198 {
1199         int i;
1200
1201         lnet_net_lock(LNET_LOCK_EX);
1202         lnet_ni_unlink_locked(ni);
1203         lnet_net_unlock(LNET_LOCK_EX);
1204
1205         /* clear messages for this NI on the lazy portal */
1206         for (i = 0; i < the_lnet.ln_nportals; i++)
1207                 lnet_clear_lazy_portal(ni, i, "Shutting down NI");
1208
1209         /* Do peer table cleanup for this ni */
1210         lnet_peer_tables_cleanup(ni);
1211
1212         lnet_net_lock(LNET_LOCK_EX);
1213         lnet_clear_zombies_nis_locked();
1214         lnet_net_unlock(LNET_LOCK_EX);
1215 }
1216
1217 static int
1218 lnet_startup_lndni(struct lnet_ni *ni, struct lnet_ioctl_config_data *conf)
1219 {
1220         struct lnet_ioctl_config_lnd_tunables *lnd_tunables = NULL;
1221         int rc = -EINVAL;
1222         int lnd_type;
1223         struct lnet_lnd *lnd;
1224         struct lnet_tx_queue *tq;
1225         int i;
1226
1227         lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
1228
1229         LASSERT(libcfs_isknown_lnd(lnd_type));
1230
1231         if (lnd_type == CIBLND || lnd_type == OPENIBLND ||
1232             lnd_type == IIBLND || lnd_type == VIBLND) {
1233                 CERROR("LND %s obsoleted\n", libcfs_lnd2str(lnd_type));
1234                 goto failed0;
1235         }
1236
1237         /* Make sure this new NI is unique. */
1238         lnet_net_lock(LNET_LOCK_EX);
1239         rc = lnet_net_unique(LNET_NIDNET(ni->ni_nid), &the_lnet.ln_nis);
1240         lnet_net_unlock(LNET_LOCK_EX);
1241         if (!rc) {
1242                 if (lnd_type == LOLND) {
1243                         lnet_ni_free(ni);
1244                         return 0;
1245                 }
1246
1247                 CERROR("Net %s is not unique\n",
1248                        libcfs_net2str(LNET_NIDNET(ni->ni_nid)));
1249                 rc = -EEXIST;
1250                 goto failed0;
1251         }
1252
1253         mutex_lock(&the_lnet.ln_lnd_mutex);
1254         lnd = lnet_find_lnd_by_type(lnd_type);
1255
1256         if (!lnd) {
1257                 mutex_unlock(&the_lnet.ln_lnd_mutex);
1258                 rc = request_module("%s", libcfs_lnd2modname(lnd_type));
1259                 mutex_lock(&the_lnet.ln_lnd_mutex);
1260
1261                 lnd = lnet_find_lnd_by_type(lnd_type);
1262                 if (!lnd) {
1263                         mutex_unlock(&the_lnet.ln_lnd_mutex);
1264                         CERROR("Can't load LND %s, module %s, rc=%d\n",
1265                                libcfs_lnd2str(lnd_type),
1266                                libcfs_lnd2modname(lnd_type), rc);
1267                         rc = -EINVAL;
1268                         goto failed0;
1269                 }
1270         }
1271
1272         lnet_net_lock(LNET_LOCK_EX);
1273         lnd->lnd_refcount++;
1274         lnet_net_unlock(LNET_LOCK_EX);
1275
1276         ni->ni_lnd = lnd;
1277
1278         if (conf && conf->cfg_hdr.ioc_len > sizeof(*conf))
1279                 lnd_tunables = (struct lnet_ioctl_config_lnd_tunables *)conf->cfg_bulk;
1280
1281         if (lnd_tunables) {
1282                 LIBCFS_ALLOC(ni->ni_lnd_tunables,
1283                              sizeof(*ni->ni_lnd_tunables));
1284                 if (!ni->ni_lnd_tunables) {
1285                         mutex_unlock(&the_lnet.ln_lnd_mutex);
1286                         rc = -ENOMEM;
1287                         goto failed0;
1288                 }
1289                 memcpy(ni->ni_lnd_tunables, lnd_tunables,
1290                        sizeof(*ni->ni_lnd_tunables));
1291         }
1292
1293         /*
1294          * If given some LND tunable parameters, parse those now to
1295          * override the values in the NI structure.
1296          */
1297         if (conf) {
1298                 if (conf->cfg_config_u.cfg_net.net_peer_rtr_credits >= 0)
1299                         ni->ni_peerrtrcredits =
1300                                 conf->cfg_config_u.cfg_net.net_peer_rtr_credits;
1301                 if (conf->cfg_config_u.cfg_net.net_peer_timeout >= 0)
1302                         ni->ni_peertimeout =
1303                                 conf->cfg_config_u.cfg_net.net_peer_timeout;
1304                 if (conf->cfg_config_u.cfg_net.net_peer_tx_credits != -1)
1305                         ni->ni_peertxcredits =
1306                                 conf->cfg_config_u.cfg_net.net_peer_tx_credits;
1307                 if (conf->cfg_config_u.cfg_net.net_max_tx_credits >= 0)
1308                         ni->ni_maxtxcredits =
1309                                 conf->cfg_config_u.cfg_net.net_max_tx_credits;
1310         }
1311
1312         rc = lnd->lnd_startup(ni);
1313
1314         mutex_unlock(&the_lnet.ln_lnd_mutex);
1315
1316         if (rc) {
1317                 LCONSOLE_ERROR_MSG(0x105, "Error %d starting up LNI %s\n",
1318                                    rc, libcfs_lnd2str(lnd->lnd_type));
1319                 lnet_net_lock(LNET_LOCK_EX);
1320                 lnd->lnd_refcount--;
1321                 lnet_net_unlock(LNET_LOCK_EX);
1322                 goto failed0;
1323         }
1324
1325         LASSERT(ni->ni_peertimeout <= 0 || lnd->lnd_query);
1326
1327         lnet_net_lock(LNET_LOCK_EX);
1328         /* refcount for ln_nis */
1329         lnet_ni_addref_locked(ni, 0);
1330         list_add_tail(&ni->ni_list, &the_lnet.ln_nis);
1331         if (ni->ni_cpts) {
1332                 lnet_ni_addref_locked(ni, 0);
1333                 list_add_tail(&ni->ni_cptlist, &the_lnet.ln_nis_cpt);
1334         }
1335
1336         lnet_net_unlock(LNET_LOCK_EX);
1337
1338         if (lnd->lnd_type == LOLND) {
1339                 lnet_ni_addref(ni);
1340                 LASSERT(!the_lnet.ln_loni);
1341                 the_lnet.ln_loni = ni;
1342                 return 0;
1343         }
1344
1345         if (!ni->ni_peertxcredits || !ni->ni_maxtxcredits) {
1346                 LCONSOLE_ERROR_MSG(0x107, "LNI %s has no %scredits\n",
1347                                    libcfs_lnd2str(lnd->lnd_type),
1348                                    !ni->ni_peertxcredits ?
1349                                    "" : "per-peer ");
1350                 /*
1351                  * shutdown the NI since if we get here then it must've already
1352                  * been started
1353                  */
1354                 lnet_shutdown_lndni(ni);
1355                 return -EINVAL;
1356         }
1357
1358         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
1359                 tq->tq_credits_min =
1360                 tq->tq_credits_max =
1361                 tq->tq_credits = lnet_ni_tq_credits(ni);
1362         }
1363
1364         CDEBUG(D_LNI, "Added LNI %s [%d/%d/%d/%d]\n",
1365                libcfs_nid2str(ni->ni_nid), ni->ni_peertxcredits,
1366                lnet_ni_tq_credits(ni) * LNET_CPT_NUMBER,
1367                ni->ni_peerrtrcredits, ni->ni_peertimeout);
1368
1369         return 0;
1370 failed0:
1371         lnet_ni_free(ni);
1372         return rc;
1373 }
1374
1375 static int
1376 lnet_startup_lndnis(struct list_head *nilist)
1377 {
1378         struct lnet_ni *ni;
1379         int rc;
1380         int ni_count = 0;
1381
1382         while (!list_empty(nilist)) {
1383                 ni = list_entry(nilist->next, struct lnet_ni, ni_list);
1384                 list_del(&ni->ni_list);
1385                 rc = lnet_startup_lndni(ni, NULL);
1386
1387                 if (rc < 0)
1388                         goto failed;
1389
1390                 ni_count++;
1391         }
1392
1393         return ni_count;
1394 failed:
1395         lnet_shutdown_lndnis();
1396
1397         return rc;
1398 }
1399
1400 /**
1401  * Initialize LNet library.
1402  *
1403  * Automatically called at module loading time. Caller has to call
1404  * lnet_lib_exit() after a call to lnet_lib_init(), if and only if the
1405  * latter returned 0. It must be called exactly once.
1406  *
1407  * \retval 0 on success
1408  * \retval -ve on failures.
1409  */
1410 int lnet_lib_init(void)
1411 {
1412         int rc;
1413
1414         lnet_assert_wire_constants();
1415
1416         memset(&the_lnet, 0, sizeof(the_lnet));
1417
1418         /* refer to global cfs_cpt_table for now */
1419         the_lnet.ln_cpt_table   = cfs_cpt_table;
1420         the_lnet.ln_cpt_number  = cfs_cpt_number(cfs_cpt_table);
1421
1422         LASSERT(the_lnet.ln_cpt_number > 0);
1423         if (the_lnet.ln_cpt_number > LNET_CPT_MAX) {
1424                 /* we are under risk of consuming all lh_cookie */
1425                 CERROR("Can't have %d CPTs for LNet (max allowed is %d), please change setting of CPT-table and retry\n",
1426                        the_lnet.ln_cpt_number, LNET_CPT_MAX);
1427                 return -E2BIG;
1428         }
1429
1430         while ((1 << the_lnet.ln_cpt_bits) < the_lnet.ln_cpt_number)
1431                 the_lnet.ln_cpt_bits++;
1432
1433         rc = lnet_create_locks();
1434         if (rc) {
1435                 CERROR("Can't create LNet global locks: %d\n", rc);
1436                 return rc;
1437         }
1438
1439         the_lnet.ln_refcount = 0;
1440         LNetInvalidateEQHandle(&the_lnet.ln_rc_eqh);
1441         INIT_LIST_HEAD(&the_lnet.ln_lnds);
1442         INIT_LIST_HEAD(&the_lnet.ln_rcd_zombie);
1443         INIT_LIST_HEAD(&the_lnet.ln_rcd_deathrow);
1444
1445         /*
1446          * The hash table size is the number of bits it takes to express the set
1447          * ln_num_routes, minus 1 (better to under estimate than over so we
1448          * don't waste memory).
1449          */
1450         if (rnet_htable_size <= 0)
1451                 rnet_htable_size = LNET_REMOTE_NETS_HASH_DEFAULT;
1452         else if (rnet_htable_size > LNET_REMOTE_NETS_HASH_MAX)
1453                 rnet_htable_size = LNET_REMOTE_NETS_HASH_MAX;
1454         the_lnet.ln_remote_nets_hbits = max_t(int, 1,
1455                                            order_base_2(rnet_htable_size) - 1);
1456
1457         /*
1458          * All LNDs apart from the LOLND are in separate modules.  They
1459          * register themselves when their module loads, and unregister
1460          * themselves when their module is unloaded.
1461          */
1462         lnet_register_lnd(&the_lolnd);
1463         return 0;
1464 }
1465
1466 /**
1467  * Finalize LNet library.
1468  *
1469  * \pre lnet_lib_init() called with success.
1470  * \pre All LNet users called LNetNIFini() for matching LNetNIInit() calls.
1471  */
1472 void lnet_lib_exit(void)
1473 {
1474         LASSERT(!the_lnet.ln_refcount);
1475
1476         while (!list_empty(&the_lnet.ln_lnds))
1477                 lnet_unregister_lnd(list_entry(the_lnet.ln_lnds.next,
1478                                                struct lnet_lnd, lnd_list));
1479         lnet_destroy_locks();
1480 }
1481
1482 /**
1483  * Set LNet PID and start LNet interfaces, routing, and forwarding.
1484  *
1485  * Users must call this function at least once before any other functions.
1486  * For each successful call there must be a corresponding call to
1487  * LNetNIFini(). For subsequent calls to LNetNIInit(), \a requested_pid is
1488  * ignored.
1489  *
1490  * The PID used by LNet may be different from the one requested.
1491  * See LNetGetId().
1492  *
1493  * \param requested_pid PID requested by the caller.
1494  *
1495  * \return >= 0 on success, and < 0 error code on failures.
1496  */
1497 int
1498 LNetNIInit(lnet_pid_t requested_pid)
1499 {
1500         int im_a_router = 0;
1501         int rc;
1502         int ni_count;
1503         struct lnet_ping_info *pinfo;
1504         struct lnet_handle_md md_handle;
1505         struct list_head net_head;
1506
1507         INIT_LIST_HEAD(&net_head);
1508
1509         mutex_lock(&the_lnet.ln_api_mutex);
1510
1511         CDEBUG(D_OTHER, "refs %d\n", the_lnet.ln_refcount);
1512
1513         if (the_lnet.ln_refcount > 0) {
1514                 rc = the_lnet.ln_refcount++;
1515                 mutex_unlock(&the_lnet.ln_api_mutex);
1516                 return rc;
1517         }
1518
1519         rc = lnet_prepare(requested_pid);
1520         if (rc) {
1521                 mutex_unlock(&the_lnet.ln_api_mutex);
1522                 return rc;
1523         }
1524
1525         /* Add in the loopback network */
1526         if (!lnet_ni_alloc(LNET_MKNET(LOLND, 0), NULL, &net_head)) {
1527                 rc = -ENOMEM;
1528                 goto err_empty_list;
1529         }
1530
1531         /*
1532          * If LNet is being initialized via DLC it is possible
1533          * that the user requests not to load module parameters (ones which
1534          * are supported by DLC) on initialization.  Therefore, make sure not
1535          * to load networks, routes and forwarding from module parameters
1536          * in this case. On cleanup in case of failure only clean up
1537          * routes if it has been loaded
1538          */
1539         if (!the_lnet.ln_nis_from_mod_params) {
1540                 rc = lnet_parse_networks(&net_head, lnet_get_networks());
1541                 if (rc < 0)
1542                         goto err_empty_list;
1543         }
1544
1545         ni_count = lnet_startup_lndnis(&net_head);
1546         if (ni_count < 0) {
1547                 rc = ni_count;
1548                 goto err_empty_list;
1549         }
1550
1551         if (!the_lnet.ln_nis_from_mod_params) {
1552                 rc = lnet_parse_routes(lnet_get_routes(), &im_a_router);
1553                 if (rc)
1554                         goto err_shutdown_lndnis;
1555
1556                 rc = lnet_check_routes();
1557                 if (rc)
1558                         goto err_destroy_routes;
1559
1560                 rc = lnet_rtrpools_alloc(im_a_router);
1561                 if (rc)
1562                         goto err_destroy_routes;
1563         }
1564
1565         rc = lnet_acceptor_start();
1566         if (rc)
1567                 goto err_destroy_routes;
1568
1569         the_lnet.ln_refcount = 1;
1570         /* Now I may use my own API functions... */
1571
1572         rc = lnet_ping_info_setup(&pinfo, &md_handle, ni_count, true);
1573         if (rc)
1574                 goto err_acceptor_stop;
1575
1576         lnet_ping_target_update(pinfo, md_handle);
1577
1578         rc = lnet_router_checker_start();
1579         if (rc)
1580                 goto err_stop_ping;
1581
1582         lnet_fault_init();
1583         lnet_router_debugfs_init();
1584
1585         mutex_unlock(&the_lnet.ln_api_mutex);
1586
1587         return 0;
1588
1589 err_stop_ping:
1590         lnet_ping_target_fini();
1591 err_acceptor_stop:
1592         the_lnet.ln_refcount = 0;
1593         lnet_acceptor_stop();
1594 err_destroy_routes:
1595         if (!the_lnet.ln_nis_from_mod_params)
1596                 lnet_destroy_routes();
1597 err_shutdown_lndnis:
1598         lnet_shutdown_lndnis();
1599 err_empty_list:
1600         lnet_unprepare();
1601         LASSERT(rc < 0);
1602         mutex_unlock(&the_lnet.ln_api_mutex);
1603         while (!list_empty(&net_head)) {
1604                 struct lnet_ni *ni;
1605
1606                 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1607                 list_del_init(&ni->ni_list);
1608                 lnet_ni_free(ni);
1609         }
1610         return rc;
1611 }
1612 EXPORT_SYMBOL(LNetNIInit);
1613
1614 /**
1615  * Stop LNet interfaces, routing, and forwarding.
1616  *
1617  * Users must call this function once for each successful call to LNetNIInit().
1618  * Once the LNetNIFini() operation has been started, the results of pending
1619  * API operations are undefined.
1620  *
1621  * \return always 0 for current implementation.
1622  */
1623 int
1624 LNetNIFini(void)
1625 {
1626         mutex_lock(&the_lnet.ln_api_mutex);
1627
1628         LASSERT(the_lnet.ln_refcount > 0);
1629
1630         if (the_lnet.ln_refcount != 1) {
1631                 the_lnet.ln_refcount--;
1632         } else {
1633                 LASSERT(!the_lnet.ln_niinit_self);
1634
1635                 lnet_fault_fini();
1636                 lnet_router_debugfs_fini();
1637                 lnet_router_checker_stop();
1638                 lnet_ping_target_fini();
1639
1640                 /* Teardown fns that use my own API functions BEFORE here */
1641                 the_lnet.ln_refcount = 0;
1642
1643                 lnet_acceptor_stop();
1644                 lnet_destroy_routes();
1645                 lnet_shutdown_lndnis();
1646                 lnet_unprepare();
1647         }
1648
1649         mutex_unlock(&the_lnet.ln_api_mutex);
1650         return 0;
1651 }
1652 EXPORT_SYMBOL(LNetNIFini);
1653
1654 /**
1655  * Grabs the ni data from the ni structure and fills the out
1656  * parameters
1657  *
1658  * \param[in] ni network       interface structure
1659  * \param[out] config          NI configuration
1660  */
1661 static void
1662 lnet_fill_ni_info(struct lnet_ni *ni, struct lnet_ioctl_config_data *config)
1663 {
1664         struct lnet_ioctl_config_lnd_tunables *lnd_cfg = NULL;
1665         struct lnet_ioctl_net_config *net_config;
1666         size_t min_size, tunable_size = 0;
1667         int i;
1668
1669         if (!ni || !config)
1670                 return;
1671
1672         net_config = (struct lnet_ioctl_net_config *)config->cfg_bulk;
1673         if (!net_config)
1674                 return;
1675
1676         BUILD_BUG_ON(ARRAY_SIZE(ni->ni_interfaces) !=
1677                      ARRAY_SIZE(net_config->ni_interfaces));
1678
1679         for (i = 0; i < ARRAY_SIZE(ni->ni_interfaces); i++) {
1680                 if (!ni->ni_interfaces[i])
1681                         break;
1682
1683                 strncpy(net_config->ni_interfaces[i],
1684                         ni->ni_interfaces[i],
1685                         sizeof(net_config->ni_interfaces[i]));
1686         }
1687
1688         config->cfg_nid = ni->ni_nid;
1689         config->cfg_config_u.cfg_net.net_peer_timeout = ni->ni_peertimeout;
1690         config->cfg_config_u.cfg_net.net_max_tx_credits = ni->ni_maxtxcredits;
1691         config->cfg_config_u.cfg_net.net_peer_tx_credits = ni->ni_peertxcredits;
1692         config->cfg_config_u.cfg_net.net_peer_rtr_credits = ni->ni_peerrtrcredits;
1693
1694         net_config->ni_status = ni->ni_status->ns_status;
1695
1696         if (ni->ni_cpts) {
1697                 int num_cpts = min(ni->ni_ncpts, LNET_MAX_SHOW_NUM_CPT);
1698
1699                 for (i = 0; i < num_cpts; i++)
1700                         net_config->ni_cpts[i] = ni->ni_cpts[i];
1701
1702                 config->cfg_ncpts = num_cpts;
1703         }
1704
1705         /*
1706          * See if user land tools sent in a newer and larger version
1707          * of struct lnet_tunables than what the kernel uses.
1708          */
1709         min_size = sizeof(*config) + sizeof(*net_config);
1710
1711         if (config->cfg_hdr.ioc_len > min_size)
1712                 tunable_size = config->cfg_hdr.ioc_len - min_size;
1713
1714         /* Don't copy to much data to user space */
1715         min_size = min(tunable_size, sizeof(*ni->ni_lnd_tunables));
1716         lnd_cfg = (struct lnet_ioctl_config_lnd_tunables *)net_config->cfg_bulk;
1717
1718         if (ni->ni_lnd_tunables && lnd_cfg && min_size) {
1719                 memcpy(lnd_cfg, ni->ni_lnd_tunables, min_size);
1720                 config->cfg_config_u.cfg_net.net_interface_count = 1;
1721
1722                 /* Tell user land that kernel side has less data */
1723                 if (tunable_size > sizeof(*ni->ni_lnd_tunables)) {
1724                         min_size = tunable_size - sizeof(ni->ni_lnd_tunables);
1725                         config->cfg_hdr.ioc_len -= min_size;
1726                 }
1727         }
1728 }
1729
1730 static int
1731 lnet_get_net_config(struct lnet_ioctl_config_data *config)
1732 {
1733         struct lnet_ni *ni;
1734         struct list_head *tmp;
1735         int idx = config->cfg_count;
1736         int cpt, i = 0;
1737         int rc = -ENOENT;
1738
1739         cpt = lnet_net_lock_current();
1740
1741         list_for_each(tmp, &the_lnet.ln_nis) {
1742                 if (i++ != idx)
1743                         continue;
1744
1745                 ni = list_entry(tmp, struct lnet_ni, ni_list);
1746                 lnet_ni_lock(ni);
1747                 lnet_fill_ni_info(ni, config);
1748                 lnet_ni_unlock(ni);
1749                 rc = 0;
1750                 break;
1751         }
1752
1753         lnet_net_unlock(cpt);
1754         return rc;
1755 }
1756
1757 int
1758 lnet_dyn_add_ni(lnet_pid_t requested_pid, struct lnet_ioctl_config_data *conf)
1759 {
1760         char *nets = conf->cfg_config_u.cfg_net.net_intf;
1761         struct lnet_ping_info *pinfo;
1762         struct lnet_handle_md md_handle;
1763         struct lnet_ni *ni;
1764         struct list_head net_head;
1765         struct lnet_remotenet *rnet;
1766         int rc;
1767
1768         INIT_LIST_HEAD(&net_head);
1769
1770         /* Create a ni structure for the network string */
1771         rc = lnet_parse_networks(&net_head, nets);
1772         if (rc <= 0)
1773                 return !rc ? -EINVAL : rc;
1774
1775         mutex_lock(&the_lnet.ln_api_mutex);
1776
1777         if (rc > 1) {
1778                 rc = -EINVAL; /* only add one interface per call */
1779                 goto failed0;
1780         }
1781
1782         ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1783
1784         lnet_net_lock(LNET_LOCK_EX);
1785         rnet = lnet_find_net_locked(LNET_NIDNET(ni->ni_nid));
1786         lnet_net_unlock(LNET_LOCK_EX);
1787         /*
1788          * make sure that the net added doesn't invalidate the current
1789          * configuration LNet is keeping
1790          */
1791         if (rnet) {
1792                 CERROR("Adding net %s will invalidate routing configuration\n",
1793                        nets);
1794                 rc = -EUSERS;
1795                 goto failed0;
1796         }
1797
1798         rc = lnet_ping_info_setup(&pinfo, &md_handle, 1 + lnet_get_ni_count(),
1799                                   false);
1800         if (rc)
1801                 goto failed0;
1802
1803         list_del_init(&ni->ni_list);
1804
1805         rc = lnet_startup_lndni(ni, conf);
1806         if (rc)
1807                 goto failed1;
1808
1809         if (ni->ni_lnd->lnd_accept) {
1810                 rc = lnet_acceptor_start();
1811                 if (rc < 0) {
1812                         /* shutdown the ni that we just started */
1813                         CERROR("Failed to start up acceptor thread\n");
1814                         lnet_shutdown_lndni(ni);
1815                         goto failed1;
1816                 }
1817         }
1818
1819         lnet_ping_target_update(pinfo, md_handle);
1820         mutex_unlock(&the_lnet.ln_api_mutex);
1821
1822         return 0;
1823
1824 failed1:
1825         lnet_ping_md_unlink(pinfo, &md_handle);
1826         lnet_ping_info_free(pinfo);
1827 failed0:
1828         mutex_unlock(&the_lnet.ln_api_mutex);
1829         while (!list_empty(&net_head)) {
1830                 ni = list_entry(net_head.next, struct lnet_ni, ni_list);
1831                 list_del_init(&ni->ni_list);
1832                 lnet_ni_free(ni);
1833         }
1834         return rc;
1835 }
1836
1837 int
1838 lnet_dyn_del_ni(__u32 net)
1839 {
1840         struct lnet_ni *ni;
1841         struct lnet_ping_info *pinfo;
1842         struct lnet_handle_md md_handle;
1843         int rc;
1844
1845         /* don't allow userspace to shutdown the LOLND */
1846         if (LNET_NETTYP(net) == LOLND)
1847                 return -EINVAL;
1848
1849         mutex_lock(&the_lnet.ln_api_mutex);
1850         /* create and link a new ping info, before removing the old one */
1851         rc = lnet_ping_info_setup(&pinfo, &md_handle,
1852                                   lnet_get_ni_count() - 1, false);
1853         if (rc)
1854                 goto out;
1855
1856         ni = lnet_net2ni(net);
1857         if (!ni) {
1858                 rc = -EINVAL;
1859                 goto failed;
1860         }
1861
1862         /* decrement the reference counter taken by lnet_net2ni() */
1863         lnet_ni_decref_locked(ni, 0);
1864
1865         lnet_shutdown_lndni(ni);
1866
1867         if (!lnet_count_acceptor_nis())
1868                 lnet_acceptor_stop();
1869
1870         lnet_ping_target_update(pinfo, md_handle);
1871         goto out;
1872 failed:
1873         lnet_ping_md_unlink(pinfo, &md_handle);
1874         lnet_ping_info_free(pinfo);
1875 out:
1876         mutex_unlock(&the_lnet.ln_api_mutex);
1877
1878         return rc;
1879 }
1880
1881 /**
1882  * LNet ioctl handler.
1883  *
1884  */
1885 int
1886 LNetCtl(unsigned int cmd, void *arg)
1887 {
1888         struct libcfs_ioctl_data *data = arg;
1889         struct lnet_ioctl_config_data *config;
1890         struct lnet_process_id id = {0};
1891         struct lnet_ni *ni;
1892         int rc;
1893         unsigned long secs_passed;
1894
1895         BUILD_BUG_ON(LIBCFS_IOC_DATA_MAX <
1896                      sizeof(struct lnet_ioctl_net_config) +
1897                      sizeof(struct lnet_ioctl_config_data));
1898
1899         switch (cmd) {
1900         case IOC_LIBCFS_GET_NI:
1901                 rc = LNetGetId(data->ioc_count, &id);
1902                 data->ioc_nid = id.nid;
1903                 return rc;
1904
1905         case IOC_LIBCFS_FAIL_NID:
1906                 return lnet_fail_nid(data->ioc_nid, data->ioc_count);
1907
1908         case IOC_LIBCFS_ADD_ROUTE:
1909                 config = arg;
1910
1911                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1912                         return -EINVAL;
1913
1914                 mutex_lock(&the_lnet.ln_api_mutex);
1915                 rc = lnet_add_route(config->cfg_net,
1916                                     config->cfg_config_u.cfg_route.rtr_hop,
1917                                     config->cfg_nid,
1918                                     config->cfg_config_u.cfg_route.rtr_priority);
1919                 if (!rc) {
1920                         rc = lnet_check_routes();
1921                         if (rc)
1922                                 lnet_del_route(config->cfg_net,
1923                                                config->cfg_nid);
1924                 }
1925                 mutex_unlock(&the_lnet.ln_api_mutex);
1926                 return rc;
1927
1928         case IOC_LIBCFS_DEL_ROUTE:
1929                 config = arg;
1930
1931                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1932                         return -EINVAL;
1933
1934                 mutex_lock(&the_lnet.ln_api_mutex);
1935                 rc = lnet_del_route(config->cfg_net, config->cfg_nid);
1936                 mutex_unlock(&the_lnet.ln_api_mutex);
1937                 return rc;
1938
1939         case IOC_LIBCFS_GET_ROUTE:
1940                 config = arg;
1941
1942                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1943                         return -EINVAL;
1944
1945                 return lnet_get_route(config->cfg_count,
1946                                       &config->cfg_net,
1947                                       &config->cfg_config_u.cfg_route.rtr_hop,
1948                                       &config->cfg_nid,
1949                                       &config->cfg_config_u.cfg_route.rtr_flags,
1950                                       &config->cfg_config_u.cfg_route.rtr_priority);
1951
1952         case IOC_LIBCFS_GET_NET: {
1953                 size_t total = sizeof(*config) +
1954                                sizeof(struct lnet_ioctl_net_config);
1955                 config = arg;
1956
1957                 if (config->cfg_hdr.ioc_len < total)
1958                         return -EINVAL;
1959
1960                 return lnet_get_net_config(config);
1961         }
1962
1963         case IOC_LIBCFS_GET_LNET_STATS: {
1964                 struct lnet_ioctl_lnet_stats *lnet_stats = arg;
1965
1966                 if (lnet_stats->st_hdr.ioc_len < sizeof(*lnet_stats))
1967                         return -EINVAL;
1968
1969                 lnet_counters_get(&lnet_stats->st_cntrs);
1970                 return 0;
1971         }
1972
1973         case IOC_LIBCFS_CONFIG_RTR:
1974                 config = arg;
1975
1976                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1977                         return -EINVAL;
1978
1979                 mutex_lock(&the_lnet.ln_api_mutex);
1980                 if (config->cfg_config_u.cfg_buffers.buf_enable) {
1981                         rc = lnet_rtrpools_enable();
1982                         mutex_unlock(&the_lnet.ln_api_mutex);
1983                         return rc;
1984                 }
1985                 lnet_rtrpools_disable();
1986                 mutex_unlock(&the_lnet.ln_api_mutex);
1987                 return 0;
1988
1989         case IOC_LIBCFS_ADD_BUF:
1990                 config = arg;
1991
1992                 if (config->cfg_hdr.ioc_len < sizeof(*config))
1993                         return -EINVAL;
1994
1995                 mutex_lock(&the_lnet.ln_api_mutex);
1996                 rc = lnet_rtrpools_adjust(config->cfg_config_u.cfg_buffers.buf_tiny,
1997                                           config->cfg_config_u.cfg_buffers.buf_small,
1998                                           config->cfg_config_u.cfg_buffers.buf_large);
1999                 mutex_unlock(&the_lnet.ln_api_mutex);
2000                 return rc;
2001
2002         case IOC_LIBCFS_GET_BUF: {
2003                 struct lnet_ioctl_pool_cfg *pool_cfg;
2004                 size_t total = sizeof(*config) + sizeof(*pool_cfg);
2005
2006                 config = arg;
2007
2008                 if (config->cfg_hdr.ioc_len < total)
2009                         return -EINVAL;
2010
2011                 pool_cfg = (struct lnet_ioctl_pool_cfg *)config->cfg_bulk;
2012                 return lnet_get_rtr_pool_cfg(config->cfg_count, pool_cfg);
2013         }
2014
2015         case IOC_LIBCFS_GET_PEER_INFO: {
2016                 struct lnet_ioctl_peer *peer_info = arg;
2017
2018                 if (peer_info->pr_hdr.ioc_len < sizeof(*peer_info))
2019                         return -EINVAL;
2020
2021                 return lnet_get_peer_info(peer_info->pr_count,
2022                         &peer_info->pr_nid,
2023                         peer_info->pr_lnd_u.pr_peer_credits.cr_aliveness,
2024                         &peer_info->pr_lnd_u.pr_peer_credits.cr_ncpt,
2025                         &peer_info->pr_lnd_u.pr_peer_credits.cr_refcount,
2026                         &peer_info->pr_lnd_u.pr_peer_credits.cr_ni_peer_tx_credits,
2027                         &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_credits,
2028                         &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_rtr_credits,
2029                         &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_min_rtr_credits,
2030                         &peer_info->pr_lnd_u.pr_peer_credits.cr_peer_tx_qnob);
2031         }
2032
2033         case IOC_LIBCFS_NOTIFY_ROUTER:
2034                 secs_passed = (ktime_get_real_seconds() - data->ioc_u64[0]);
2035                 secs_passed *= msecs_to_jiffies(MSEC_PER_SEC);
2036
2037                 return lnet_notify(NULL, data->ioc_nid, data->ioc_flags,
2038                                    jiffies - secs_passed);
2039
2040         case IOC_LIBCFS_LNET_DIST:
2041                 rc = LNetDist(data->ioc_nid, &data->ioc_nid, &data->ioc_u32[1]);
2042                 if (rc < 0 && rc != -EHOSTUNREACH)
2043                         return rc;
2044
2045                 data->ioc_u32[0] = rc;
2046                 return 0;
2047
2048         case IOC_LIBCFS_TESTPROTOCOMPAT:
2049                 lnet_net_lock(LNET_LOCK_EX);
2050                 the_lnet.ln_testprotocompat = data->ioc_flags;
2051                 lnet_net_unlock(LNET_LOCK_EX);
2052                 return 0;
2053
2054         case IOC_LIBCFS_LNET_FAULT:
2055                 return lnet_fault_ctl(data->ioc_flags, data);
2056
2057         case IOC_LIBCFS_PING:
2058                 id.nid = data->ioc_nid;
2059                 id.pid = data->ioc_u32[0];
2060                 rc = lnet_ping(id, data->ioc_u32[1], /* timeout */
2061                                data->ioc_pbuf1,
2062                                data->ioc_plen1 / sizeof(struct lnet_process_id));
2063                 if (rc < 0)
2064                         return rc;
2065                 data->ioc_count = rc;
2066                 return 0;
2067
2068         default:
2069                 ni = lnet_net2ni(data->ioc_net);
2070                 if (!ni)
2071                         return -EINVAL;
2072
2073                 if (!ni->ni_lnd->lnd_ctl)
2074                         rc = -EINVAL;
2075                 else
2076                         rc = ni->ni_lnd->lnd_ctl(ni, cmd, arg);
2077
2078                 lnet_ni_decref(ni);
2079                 return rc;
2080         }
2081         /* not reached */
2082 }
2083 EXPORT_SYMBOL(LNetCtl);
2084
2085 void LNetDebugPeer(struct lnet_process_id id)
2086 {
2087         lnet_debug_peer(id.nid);
2088 }
2089 EXPORT_SYMBOL(LNetDebugPeer);
2090
2091 /**
2092  * Retrieve the lnet_process_id ID of LNet interface at \a index. Note that
2093  * all interfaces share a same PID, as requested by LNetNIInit().
2094  *
2095  * \param index Index of the interface to look up.
2096  * \param id On successful return, this location will hold the
2097  * lnet_process_id ID of the interface.
2098  *
2099  * \retval 0 If an interface exists at \a index.
2100  * \retval -ENOENT If no interface has been found.
2101  */
2102 int
2103 LNetGetId(unsigned int index, struct lnet_process_id *id)
2104 {
2105         struct lnet_ni *ni;
2106         struct list_head *tmp;
2107         int cpt;
2108         int rc = -ENOENT;
2109
2110         LASSERT(the_lnet.ln_refcount > 0);
2111
2112         cpt = lnet_net_lock_current();
2113
2114         list_for_each(tmp, &the_lnet.ln_nis) {
2115                 if (index--)
2116                         continue;
2117
2118                 ni = list_entry(tmp, struct lnet_ni, ni_list);
2119
2120                 id->nid = ni->ni_nid;
2121                 id->pid = the_lnet.ln_pid;
2122                 rc = 0;
2123                 break;
2124         }
2125
2126         lnet_net_unlock(cpt);
2127         return rc;
2128 }
2129 EXPORT_SYMBOL(LNetGetId);
2130
2131 static int lnet_ping(struct lnet_process_id id, int timeout_ms,
2132                      struct lnet_process_id __user *ids, int n_ids)
2133 {
2134         struct lnet_handle_eq eqh;
2135         struct lnet_handle_md mdh;
2136         struct lnet_event event;
2137         struct lnet_md md = { NULL };
2138         int which;
2139         int unlinked = 0;
2140         int replied = 0;
2141         const int a_long_time = 60000; /* mS */
2142         int infosz;
2143         struct lnet_ping_info *info;
2144         struct lnet_process_id tmpid;
2145         int i;
2146         int nob;
2147         int rc;
2148         int rc2;
2149         sigset_t blocked;
2150
2151         infosz = offsetof(struct lnet_ping_info, pi_ni[n_ids]);
2152
2153         if (n_ids <= 0 ||
2154             id.nid == LNET_NID_ANY ||
2155             timeout_ms > 500000 ||            /* arbitrary limit! */
2156             n_ids > 20)                  /* arbitrary limit! */
2157                 return -EINVAL;
2158
2159         if (id.pid == LNET_PID_ANY)
2160                 id.pid = LNET_PID_LUSTRE;
2161
2162         LIBCFS_ALLOC(info, infosz);
2163         if (!info)
2164                 return -ENOMEM;
2165
2166         /* NB 2 events max (including any unlink event) */
2167         rc = LNetEQAlloc(2, LNET_EQ_HANDLER_NONE, &eqh);
2168         if (rc) {
2169                 CERROR("Can't allocate EQ: %d\n", rc);
2170                 goto out_0;
2171         }
2172
2173         /* initialize md content */
2174         md.start     = info;
2175         md.length    = infosz;
2176         md.threshold = 2; /*GET/REPLY*/
2177         md.max_size  = 0;
2178         md.options   = LNET_MD_TRUNCATE;
2179         md.user_ptr  = NULL;
2180         md.eq_handle = eqh;
2181
2182         rc = LNetMDBind(md, LNET_UNLINK, &mdh);
2183         if (rc) {
2184                 CERROR("Can't bind MD: %d\n", rc);
2185                 goto out_1;
2186         }
2187
2188         rc = LNetGet(LNET_NID_ANY, mdh, id,
2189                      LNET_RESERVED_PORTAL,
2190                      LNET_PROTO_PING_MATCHBITS, 0);
2191
2192         if (rc) {
2193                 /* Don't CERROR; this could be deliberate! */
2194
2195                 rc2 = LNetMDUnlink(mdh);
2196                 LASSERT(!rc2);
2197
2198                 /* NB must wait for the UNLINK event below... */
2199                 unlinked = 1;
2200                 timeout_ms = a_long_time;
2201         }
2202
2203         do {
2204                 /* MUST block for unlink to complete */
2205                 if (unlinked)
2206                         blocked = cfs_block_allsigs();
2207
2208                 rc2 = LNetEQPoll(&eqh, 1, timeout_ms, &event, &which);
2209
2210                 if (unlinked)
2211                         cfs_restore_sigs(blocked);
2212
2213                 CDEBUG(D_NET, "poll %d(%d %d)%s\n", rc2,
2214                        (rc2 <= 0) ? -1 : event.type,
2215                        (rc2 <= 0) ? -1 : event.status,
2216                        (rc2 > 0 && event.unlinked) ? " unlinked" : "");
2217
2218                 LASSERT(rc2 != -EOVERFLOW);     /* can't miss anything */
2219
2220                 if (rc2 <= 0 || event.status) {
2221                         /* timeout or error */
2222                         if (!replied && !rc)
2223                                 rc = (rc2 < 0) ? rc2 :
2224                                      !rc2 ? -ETIMEDOUT :
2225                                      event.status;
2226
2227                         if (!unlinked) {
2228                                 /* Ensure completion in finite time... */
2229                                 LNetMDUnlink(mdh);
2230                                 /* No assertion (racing with network) */
2231                                 unlinked = 1;
2232                                 timeout_ms = a_long_time;
2233                         } else if (!rc2) {
2234                                 /* timed out waiting for unlink */
2235                                 CWARN("ping %s: late network completion\n",
2236                                       libcfs_id2str(id));
2237                         }
2238                 } else if (event.type == LNET_EVENT_REPLY) {
2239                         replied = 1;
2240                         rc = event.mlength;
2241                 }
2242
2243         } while (rc2 <= 0 || !event.unlinked);
2244
2245         if (!replied) {
2246                 if (rc >= 0)
2247                         CWARN("%s: Unexpected rc >= 0 but no reply!\n",
2248                               libcfs_id2str(id));
2249                 rc = -EIO;
2250                 goto out_1;
2251         }
2252
2253         nob = rc;
2254         LASSERT(nob >= 0 && nob <= infosz);
2255
2256         rc = -EPROTO;                      /* if I can't parse... */
2257
2258         if (nob < 8) {
2259                 /* can't check magic/version */
2260                 CERROR("%s: ping info too short %d\n",
2261                        libcfs_id2str(id), nob);
2262                 goto out_1;
2263         }
2264
2265         if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
2266                 lnet_swap_pinginfo(info);
2267         } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
2268                 CERROR("%s: Unexpected magic %08x\n",
2269                        libcfs_id2str(id), info->pi_magic);
2270                 goto out_1;
2271         }
2272
2273         if (!(info->pi_features & LNET_PING_FEAT_NI_STATUS)) {
2274                 CERROR("%s: ping w/o NI status: 0x%x\n",
2275                        libcfs_id2str(id), info->pi_features);
2276                 goto out_1;
2277         }
2278
2279         if (nob < offsetof(struct lnet_ping_info, pi_ni[0])) {
2280                 CERROR("%s: Short reply %d(%d min)\n", libcfs_id2str(id),
2281                        nob, (int)offsetof(struct lnet_ping_info, pi_ni[0]));
2282                 goto out_1;
2283         }
2284
2285         if (info->pi_nnis < n_ids)
2286                 n_ids = info->pi_nnis;
2287
2288         if (nob < offsetof(struct lnet_ping_info, pi_ni[n_ids])) {
2289                 CERROR("%s: Short reply %d(%d expected)\n", libcfs_id2str(id),
2290                        nob, (int)offsetof(struct lnet_ping_info, pi_ni[n_ids]));
2291                 goto out_1;
2292         }
2293
2294         rc = -EFAULT;                      /* If I SEGV... */
2295
2296         memset(&tmpid, 0, sizeof(tmpid));
2297         for (i = 0; i < n_ids; i++) {
2298                 tmpid.pid = info->pi_pid;
2299                 tmpid.nid = info->pi_ni[i].ns_nid;
2300                 if (copy_to_user(&ids[i], &tmpid, sizeof(tmpid)))
2301                         goto out_1;
2302         }
2303         rc = info->pi_nnis;
2304
2305  out_1:
2306         rc2 = LNetEQFree(eqh);
2307         if (rc2)
2308                 CERROR("rc2 %d\n", rc2);
2309         LASSERT(!rc2);
2310
2311  out_0:
2312         LIBCFS_FREE(info, infosz);
2313         return rc;
2314 }