1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) Intel Corporation. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include "spdk/stdinc.h" 35 36 #include "nvmf_internal.h" 37 #include "transport.h" 38 39 #include "spdk/event.h" 40 #include "spdk/likely.h" 41 #include "spdk/string.h" 42 #include "spdk/trace.h" 43 #include "spdk/nvmf_spec.h" 44 #include "spdk/uuid.h" 45 46 #include "spdk/bdev_module.h" 47 #include "spdk_internal/log.h" 48 #include "spdk_internal/utf.h" 49 50 /* 51 * States for parsing valid domains in NQNs according to RFC 1034 52 */ 53 enum spdk_nvmf_nqn_domain_states { 54 /* First character of a domain must be a letter */ 55 SPDK_NVMF_DOMAIN_ACCEPT_LETTER = 0, 56 57 /* Subsequent characters can be any of letter, digit, or hyphen */ 58 SPDK_NVMF_DOMAIN_ACCEPT_LDH = 1, 59 60 /* A domain label must end with either a letter or digit */ 61 SPDK_NVMF_DOMAIN_ACCEPT_ANY = 2 62 }; 63 64 /* Returns true if is a valid ASCII string as defined by the NVMe spec */ 65 static bool 66 spdk_nvmf_valid_ascii_string(const void *buf, size_t size) 67 { 68 const uint8_t *str = buf; 69 size_t i; 70 71 for (i = 0; i < size; i++) { 72 if (str[i] < 0x20 || str[i] > 0x7E) { 73 return false; 74 } 75 } 76 77 return true; 78 } 79 80 static bool 81 spdk_nvmf_valid_nqn(const char *nqn) 82 { 83 size_t len; 84 struct spdk_uuid uuid_value; 85 uint32_t i; 86 int bytes_consumed; 87 uint32_t domain_label_length; 88 char *reverse_domain_end; 89 uint32_t reverse_domain_end_index; 90 enum spdk_nvmf_nqn_domain_states domain_state = SPDK_NVMF_DOMAIN_ACCEPT_LETTER; 91 92 /* Check for length requirements */ 93 len = strlen(nqn); 94 if (len > SPDK_NVMF_NQN_MAX_LEN) { 95 SPDK_ERRLOG("Invalid NQN \"%s\": length %zu > max %d\n", nqn, len, SPDK_NVMF_NQN_MAX_LEN); 96 return false; 97 } 98 99 /* The nqn must be at least as long as SPDK_NVMF_NQN_MIN_LEN to contain the necessary prefix. */ 100 if (len < SPDK_NVMF_NQN_MIN_LEN) { 101 SPDK_ERRLOG("Invalid NQN \"%s\": length %zu < min %d\n", nqn, len, SPDK_NVMF_NQN_MIN_LEN); 102 return false; 103 } 104 105 /* Check for discovery controller nqn */ 106 if (!strcmp(nqn, SPDK_NVMF_DISCOVERY_NQN)) { 107 return true; 108 } 109 110 /* Check for equality with the generic nqn structure of the form "nqn.2014-08.org.nvmexpress:uuid:11111111-2222-3333-4444-555555555555" */ 111 if (!strncmp(nqn, SPDK_NVMF_NQN_UUID_PRE, SPDK_NVMF_NQN_UUID_PRE_LEN)) { 112 if (len != SPDK_NVMF_NQN_UUID_PRE_LEN + SPDK_NVMF_UUID_STRING_LEN) { 113 SPDK_ERRLOG("Invalid NQN \"%s\": uuid is not the correct length\n", nqn); 114 return false; 115 } 116 117 if (spdk_uuid_parse(&uuid_value, &nqn[SPDK_NVMF_NQN_UUID_PRE_LEN])) { 118 SPDK_ERRLOG("Invalid NQN \"%s\": uuid is not formatted correctly\n", nqn); 119 return false; 120 } 121 return true; 122 } 123 124 /* If the nqn does not match the uuid structure, the next several checks validate the form "nqn.yyyy-mm.reverse.domain:user-string" */ 125 126 if (strncmp(nqn, "nqn.", 4) != 0) { 127 SPDK_ERRLOG("Invalid NQN \"%s\": NQN must begin with \"nqn.\".\n", nqn); 128 return false; 129 } 130 131 /* Check for yyyy-mm. */ 132 if (!(isdigit(nqn[4]) && isdigit(nqn[5]) && isdigit(nqn[6]) && isdigit(nqn[7]) && 133 nqn[8] == '-' && isdigit(nqn[9]) && isdigit(nqn[10]) && nqn[11] == '.')) { 134 SPDK_ERRLOG("Invalid date code in NQN \"%s\"\n", nqn); 135 return false; 136 } 137 138 reverse_domain_end = strchr(nqn, ':'); 139 if (reverse_domain_end != NULL && (reverse_domain_end_index = reverse_domain_end - nqn) < len - 1) { 140 } else { 141 SPDK_ERRLOG("Invalid NQN \"%s\". NQN must contain user specified name with a ':' as a prefix.\n", 142 nqn); 143 return false; 144 } 145 146 /* Check for valid reverse domain */ 147 domain_label_length = 0; 148 for (i = 12; i < reverse_domain_end_index; i++) { 149 if (domain_label_length > SPDK_DOMAIN_LABEL_MAX_LEN) { 150 SPDK_ERRLOG("Invalid domain name in NQN \"%s\". At least one Label is too long.\n", nqn); 151 return false; 152 } 153 154 switch (domain_state) { 155 156 case SPDK_NVMF_DOMAIN_ACCEPT_LETTER: { 157 if (isalpha(nqn[i])) { 158 domain_state = SPDK_NVMF_DOMAIN_ACCEPT_ANY; 159 domain_label_length++; 160 break; 161 } else { 162 SPDK_ERRLOG("Invalid domain name in NQN \"%s\". Label names must start with a letter.\n", nqn); 163 return false; 164 } 165 } 166 167 case SPDK_NVMF_DOMAIN_ACCEPT_LDH: { 168 if (isalpha(nqn[i]) || isdigit(nqn[i])) { 169 domain_state = SPDK_NVMF_DOMAIN_ACCEPT_ANY; 170 domain_label_length++; 171 break; 172 } else if (nqn[i] == '-') { 173 if (i == reverse_domain_end_index - 1) { 174 SPDK_ERRLOG("Invalid domain name in NQN \"%s\". Label names must end with an alphanumeric symbol.\n", 175 nqn); 176 return false; 177 } 178 domain_state = SPDK_NVMF_DOMAIN_ACCEPT_LDH; 179 domain_label_length++; 180 break; 181 } else if (nqn[i] == '.') { 182 SPDK_ERRLOG("Invalid domain name in NQN \"%s\". Label names must end with an alphanumeric symbol.\n", 183 nqn); 184 return false; 185 } else { 186 SPDK_ERRLOG("Invalid domain name in NQN \"%s\". Label names must contain only [a-z,A-Z,0-9,'-','.'].\n", 187 nqn); 188 return false; 189 } 190 } 191 192 case SPDK_NVMF_DOMAIN_ACCEPT_ANY: { 193 if (isalpha(nqn[i]) || isdigit(nqn[i])) { 194 domain_state = SPDK_NVMF_DOMAIN_ACCEPT_ANY; 195 domain_label_length++; 196 break; 197 } else if (nqn[i] == '-') { 198 if (i == reverse_domain_end_index - 1) { 199 SPDK_ERRLOG("Invalid domain name in NQN \"%s\". Label names must end with an alphanumeric symbol.\n", 200 nqn); 201 return false; 202 } 203 domain_state = SPDK_NVMF_DOMAIN_ACCEPT_LDH; 204 domain_label_length++; 205 break; 206 } else if (nqn[i] == '.') { 207 domain_state = SPDK_NVMF_DOMAIN_ACCEPT_LETTER; 208 domain_label_length = 0; 209 break; 210 } else { 211 SPDK_ERRLOG("Invalid domain name in NQN \"%s\". Label names must contain only [a-z,A-Z,0-9,'-','.'].\n", 212 nqn); 213 return false; 214 } 215 } 216 } 217 } 218 219 i = reverse_domain_end_index + 1; 220 while (i < len) { 221 bytes_consumed = utf8_valid(&nqn[i], &nqn[len]); 222 if (bytes_consumed <= 0) { 223 SPDK_ERRLOG("Invalid domain name in NQN \"%s\". Label names must contain only valid utf-8.\n", nqn); 224 return false; 225 } 226 227 i += bytes_consumed; 228 } 229 return true; 230 } 231 232 struct spdk_nvmf_subsystem * 233 spdk_nvmf_subsystem_create(struct spdk_nvmf_tgt *tgt, 234 const char *nqn, 235 enum spdk_nvmf_subtype type, 236 uint32_t num_ns) 237 { 238 struct spdk_nvmf_subsystem *subsystem; 239 uint32_t sid; 240 241 if (spdk_nvmf_tgt_find_subsystem(tgt, nqn)) { 242 SPDK_ERRLOG("Subsystem NQN '%s' already exists\n", nqn); 243 return NULL; 244 } 245 246 if (!spdk_nvmf_valid_nqn(nqn)) { 247 return NULL; 248 } 249 250 if (type == SPDK_NVMF_SUBTYPE_DISCOVERY && num_ns != 0) { 251 SPDK_ERRLOG("Discovery subsystem cannot have namespaces.\n"); 252 return NULL; 253 } 254 255 /* Find a free subsystem id (sid) */ 256 for (sid = 0; sid < tgt->opts.max_subsystems; sid++) { 257 if (tgt->subsystems[sid] == NULL) { 258 break; 259 } 260 } 261 if (sid >= tgt->opts.max_subsystems) { 262 return NULL; 263 } 264 265 subsystem = calloc(1, sizeof(struct spdk_nvmf_subsystem)); 266 if (subsystem == NULL) { 267 return NULL; 268 } 269 270 subsystem->thread = spdk_get_thread(); 271 subsystem->state = SPDK_NVMF_SUBSYSTEM_INACTIVE; 272 subsystem->tgt = tgt; 273 subsystem->id = sid; 274 subsystem->subtype = type; 275 subsystem->max_nsid = num_ns; 276 subsystem->max_allowed_nsid = num_ns; 277 subsystem->next_cntlid = 0; 278 snprintf(subsystem->subnqn, sizeof(subsystem->subnqn), "%s", nqn); 279 TAILQ_INIT(&subsystem->listeners); 280 TAILQ_INIT(&subsystem->hosts); 281 TAILQ_INIT(&subsystem->ctrlrs); 282 283 if (num_ns != 0) { 284 subsystem->ns = calloc(num_ns, sizeof(struct spdk_nvmf_ns *)); 285 if (subsystem->ns == NULL) { 286 SPDK_ERRLOG("Namespace memory allocation failed\n"); 287 free(subsystem); 288 return NULL; 289 } 290 } 291 292 memset(subsystem->sn, '0', sizeof(subsystem->sn) - 1); 293 subsystem->sn[sizeof(subsystem->sn) - 1] = '\n'; 294 295 tgt->subsystems[sid] = subsystem; 296 tgt->discovery_genctr++; 297 298 return subsystem; 299 } 300 301 static void 302 _spdk_nvmf_subsystem_remove_host(struct spdk_nvmf_subsystem *subsystem, struct spdk_nvmf_host *host) 303 { 304 TAILQ_REMOVE(&subsystem->hosts, host, link); 305 free(host->nqn); 306 free(host); 307 } 308 309 static int _spdk_nvmf_subsystem_remove_ns(struct spdk_nvmf_subsystem *subsystem, uint32_t nsid); 310 311 void 312 spdk_nvmf_subsystem_destroy(struct spdk_nvmf_subsystem *subsystem) 313 { 314 struct spdk_nvmf_listener *listener, *listener_tmp; 315 struct spdk_nvmf_host *host, *host_tmp; 316 struct spdk_nvmf_ctrlr *ctrlr, *ctrlr_tmp; 317 struct spdk_nvmf_ns *ns; 318 319 if (!subsystem) { 320 return; 321 } 322 323 assert(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE); 324 325 SPDK_DEBUGLOG(SPDK_LOG_NVMF, "subsystem is %p\n", subsystem); 326 327 TAILQ_FOREACH_SAFE(listener, &subsystem->listeners, link, listener_tmp) { 328 TAILQ_REMOVE(&subsystem->listeners, listener, link); 329 free(listener); 330 } 331 332 TAILQ_FOREACH_SAFE(host, &subsystem->hosts, link, host_tmp) { 333 _spdk_nvmf_subsystem_remove_host(subsystem, host); 334 } 335 336 TAILQ_FOREACH_SAFE(ctrlr, &subsystem->ctrlrs, link, ctrlr_tmp) { 337 spdk_nvmf_ctrlr_destruct(ctrlr); 338 } 339 340 ns = spdk_nvmf_subsystem_get_first_ns(subsystem); 341 while (ns != NULL) { 342 struct spdk_nvmf_ns *next_ns = spdk_nvmf_subsystem_get_next_ns(subsystem, ns); 343 344 _spdk_nvmf_subsystem_remove_ns(subsystem, ns->opts.nsid); 345 ns = next_ns; 346 } 347 348 free(subsystem->ns); 349 350 subsystem->tgt->subsystems[subsystem->id] = NULL; 351 subsystem->tgt->discovery_genctr++; 352 353 free(subsystem); 354 } 355 356 static int 357 spdk_nvmf_subsystem_set_state(struct spdk_nvmf_subsystem *subsystem, 358 enum spdk_nvmf_subsystem_state state) 359 { 360 enum spdk_nvmf_subsystem_state actual_old_state, expected_old_state; 361 362 switch (state) { 363 case SPDK_NVMF_SUBSYSTEM_INACTIVE: 364 expected_old_state = SPDK_NVMF_SUBSYSTEM_DEACTIVATING; 365 break; 366 case SPDK_NVMF_SUBSYSTEM_ACTIVATING: 367 expected_old_state = SPDK_NVMF_SUBSYSTEM_INACTIVE; 368 break; 369 case SPDK_NVMF_SUBSYSTEM_ACTIVE: 370 expected_old_state = SPDK_NVMF_SUBSYSTEM_ACTIVATING; 371 break; 372 case SPDK_NVMF_SUBSYSTEM_PAUSING: 373 expected_old_state = SPDK_NVMF_SUBSYSTEM_ACTIVE; 374 break; 375 case SPDK_NVMF_SUBSYSTEM_PAUSED: 376 expected_old_state = SPDK_NVMF_SUBSYSTEM_PAUSING; 377 break; 378 case SPDK_NVMF_SUBSYSTEM_RESUMING: 379 expected_old_state = SPDK_NVMF_SUBSYSTEM_PAUSED; 380 break; 381 case SPDK_NVMF_SUBSYSTEM_DEACTIVATING: 382 expected_old_state = SPDK_NVMF_SUBSYSTEM_ACTIVE; 383 break; 384 default: 385 assert(false); 386 return -1; 387 } 388 389 actual_old_state = __sync_val_compare_and_swap(&subsystem->state, expected_old_state, state); 390 if (actual_old_state != expected_old_state) { 391 if (actual_old_state == SPDK_NVMF_SUBSYSTEM_RESUMING && 392 state == SPDK_NVMF_SUBSYSTEM_ACTIVE) { 393 expected_old_state = SPDK_NVMF_SUBSYSTEM_RESUMING; 394 } 395 /* This is for the case when activating the subsystem fails. */ 396 if (actual_old_state == SPDK_NVMF_SUBSYSTEM_ACTIVATING && 397 state == SPDK_NVMF_SUBSYSTEM_DEACTIVATING) { 398 expected_old_state = SPDK_NVMF_SUBSYSTEM_ACTIVATING; 399 } 400 actual_old_state = __sync_val_compare_and_swap(&subsystem->state, expected_old_state, state); 401 } 402 assert(actual_old_state == expected_old_state); 403 return actual_old_state - expected_old_state; 404 } 405 406 struct subsystem_state_change_ctx { 407 struct spdk_nvmf_subsystem *subsystem; 408 409 enum spdk_nvmf_subsystem_state requested_state; 410 411 spdk_nvmf_subsystem_state_change_done cb_fn; 412 void *cb_arg; 413 }; 414 415 static void 416 subsystem_state_change_done(struct spdk_io_channel_iter *i, int status) 417 { 418 struct subsystem_state_change_ctx *ctx = spdk_io_channel_iter_get_ctx(i); 419 420 if (status == 0) { 421 status = spdk_nvmf_subsystem_set_state(ctx->subsystem, ctx->requested_state); 422 if (status) { 423 status = -1; 424 } 425 } 426 427 if (ctx->cb_fn) { 428 ctx->cb_fn(ctx->subsystem, ctx->cb_arg, status); 429 } 430 free(ctx); 431 } 432 433 static void 434 subsystem_state_change_continue(void *ctx, int status) 435 { 436 struct spdk_io_channel_iter *i = ctx; 437 spdk_for_each_channel_continue(i, status); 438 } 439 440 static void 441 subsystem_state_change_on_pg(struct spdk_io_channel_iter *i) 442 { 443 struct subsystem_state_change_ctx *ctx; 444 struct spdk_io_channel *ch; 445 struct spdk_nvmf_poll_group *group; 446 447 ctx = spdk_io_channel_iter_get_ctx(i); 448 ch = spdk_io_channel_iter_get_channel(i); 449 group = spdk_io_channel_get_ctx(ch); 450 451 switch (ctx->requested_state) { 452 case SPDK_NVMF_SUBSYSTEM_INACTIVE: 453 spdk_nvmf_poll_group_remove_subsystem(group, ctx->subsystem, subsystem_state_change_continue, i); 454 break; 455 case SPDK_NVMF_SUBSYSTEM_ACTIVE: 456 if (ctx->subsystem->state == SPDK_NVMF_SUBSYSTEM_ACTIVATING) { 457 spdk_nvmf_poll_group_add_subsystem(group, ctx->subsystem, subsystem_state_change_continue, i); 458 } else if (ctx->subsystem->state == SPDK_NVMF_SUBSYSTEM_RESUMING) { 459 spdk_nvmf_poll_group_resume_subsystem(group, ctx->subsystem, subsystem_state_change_continue, i); 460 } 461 break; 462 case SPDK_NVMF_SUBSYSTEM_PAUSED: 463 spdk_nvmf_poll_group_pause_subsystem(group, ctx->subsystem, subsystem_state_change_continue, i); 464 break; 465 default: 466 assert(false); 467 break; 468 } 469 } 470 471 static int 472 spdk_nvmf_subsystem_state_change(struct spdk_nvmf_subsystem *subsystem, 473 enum spdk_nvmf_subsystem_state requested_state, 474 spdk_nvmf_subsystem_state_change_done cb_fn, 475 void *cb_arg) 476 { 477 struct subsystem_state_change_ctx *ctx; 478 enum spdk_nvmf_subsystem_state intermediate_state; 479 int rc; 480 481 switch (requested_state) { 482 case SPDK_NVMF_SUBSYSTEM_INACTIVE: 483 intermediate_state = SPDK_NVMF_SUBSYSTEM_DEACTIVATING; 484 break; 485 case SPDK_NVMF_SUBSYSTEM_ACTIVE: 486 if (subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED) { 487 intermediate_state = SPDK_NVMF_SUBSYSTEM_RESUMING; 488 } else { 489 intermediate_state = SPDK_NVMF_SUBSYSTEM_ACTIVATING; 490 } 491 break; 492 case SPDK_NVMF_SUBSYSTEM_PAUSED: 493 intermediate_state = SPDK_NVMF_SUBSYSTEM_PAUSING; 494 break; 495 default: 496 assert(false); 497 return -EINVAL; 498 } 499 500 ctx = calloc(1, sizeof(*ctx)); 501 if (!ctx) { 502 return -ENOMEM; 503 } 504 505 rc = spdk_nvmf_subsystem_set_state(subsystem, intermediate_state); 506 if (rc) { 507 free(ctx); 508 return rc; 509 } 510 511 ctx->subsystem = subsystem; 512 ctx->requested_state = requested_state; 513 ctx->cb_fn = cb_fn; 514 ctx->cb_arg = cb_arg; 515 516 spdk_for_each_channel(subsystem->tgt, 517 subsystem_state_change_on_pg, 518 ctx, 519 subsystem_state_change_done); 520 521 return 0; 522 } 523 524 int 525 spdk_nvmf_subsystem_start(struct spdk_nvmf_subsystem *subsystem, 526 spdk_nvmf_subsystem_state_change_done cb_fn, 527 void *cb_arg) 528 { 529 return spdk_nvmf_subsystem_state_change(subsystem, SPDK_NVMF_SUBSYSTEM_ACTIVE, cb_fn, cb_arg); 530 } 531 532 int 533 spdk_nvmf_subsystem_stop(struct spdk_nvmf_subsystem *subsystem, 534 spdk_nvmf_subsystem_state_change_done cb_fn, 535 void *cb_arg) 536 { 537 return spdk_nvmf_subsystem_state_change(subsystem, SPDK_NVMF_SUBSYSTEM_INACTIVE, cb_fn, cb_arg); 538 } 539 540 int 541 spdk_nvmf_subsystem_pause(struct spdk_nvmf_subsystem *subsystem, 542 spdk_nvmf_subsystem_state_change_done cb_fn, 543 void *cb_arg) 544 { 545 return spdk_nvmf_subsystem_state_change(subsystem, SPDK_NVMF_SUBSYSTEM_PAUSED, cb_fn, cb_arg); 546 } 547 548 int 549 spdk_nvmf_subsystem_resume(struct spdk_nvmf_subsystem *subsystem, 550 spdk_nvmf_subsystem_state_change_done cb_fn, 551 void *cb_arg) 552 { 553 return spdk_nvmf_subsystem_state_change(subsystem, SPDK_NVMF_SUBSYSTEM_ACTIVE, cb_fn, cb_arg); 554 } 555 556 struct spdk_nvmf_subsystem * 557 spdk_nvmf_subsystem_get_first(struct spdk_nvmf_tgt *tgt) 558 { 559 struct spdk_nvmf_subsystem *subsystem; 560 uint32_t sid; 561 562 for (sid = 0; sid < tgt->opts.max_subsystems; sid++) { 563 subsystem = tgt->subsystems[sid]; 564 if (subsystem) { 565 return subsystem; 566 } 567 } 568 569 return NULL; 570 } 571 572 struct spdk_nvmf_subsystem * 573 spdk_nvmf_subsystem_get_next(struct spdk_nvmf_subsystem *subsystem) 574 { 575 uint32_t sid; 576 struct spdk_nvmf_tgt *tgt; 577 578 if (!subsystem) { 579 return NULL; 580 } 581 582 tgt = subsystem->tgt; 583 584 for (sid = subsystem->id + 1; sid < tgt->opts.max_subsystems; sid++) { 585 subsystem = tgt->subsystems[sid]; 586 if (subsystem) { 587 return subsystem; 588 } 589 } 590 591 return NULL; 592 } 593 594 static struct spdk_nvmf_host * 595 _spdk_nvmf_subsystem_find_host(struct spdk_nvmf_subsystem *subsystem, const char *hostnqn) 596 { 597 struct spdk_nvmf_host *host = NULL; 598 599 TAILQ_FOREACH(host, &subsystem->hosts, link) { 600 if (strcmp(hostnqn, host->nqn) == 0) { 601 return host; 602 } 603 } 604 605 return NULL; 606 } 607 608 int 609 spdk_nvmf_subsystem_add_host(struct spdk_nvmf_subsystem *subsystem, const char *hostnqn) 610 { 611 struct spdk_nvmf_host *host; 612 613 if (!spdk_nvmf_valid_nqn(hostnqn)) { 614 return -EINVAL; 615 } 616 617 if (!(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE || 618 subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED)) { 619 return -EAGAIN; 620 } 621 622 if (_spdk_nvmf_subsystem_find_host(subsystem, hostnqn)) { 623 /* This subsystem already allows the specified host. */ 624 return 0; 625 } 626 627 host = calloc(1, sizeof(*host)); 628 if (!host) { 629 return -ENOMEM; 630 } 631 host->nqn = strdup(hostnqn); 632 if (!host->nqn) { 633 free(host); 634 return -ENOMEM; 635 } 636 637 TAILQ_INSERT_HEAD(&subsystem->hosts, host, link); 638 subsystem->tgt->discovery_genctr++; 639 640 return 0; 641 } 642 643 int 644 spdk_nvmf_subsystem_remove_host(struct spdk_nvmf_subsystem *subsystem, const char *hostnqn) 645 { 646 struct spdk_nvmf_host *host; 647 648 if (!(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE || 649 subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED)) { 650 return -EAGAIN; 651 } 652 653 host = _spdk_nvmf_subsystem_find_host(subsystem, hostnqn); 654 if (host == NULL) { 655 return -ENOENT; 656 } 657 658 _spdk_nvmf_subsystem_remove_host(subsystem, host); 659 return 0; 660 } 661 662 int 663 spdk_nvmf_subsystem_set_allow_any_host(struct spdk_nvmf_subsystem *subsystem, bool allow_any_host) 664 { 665 if (!(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE || 666 subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED)) { 667 return -EAGAIN; 668 } 669 670 subsystem->allow_any_host = allow_any_host; 671 672 return 0; 673 } 674 675 bool 676 spdk_nvmf_subsystem_get_allow_any_host(const struct spdk_nvmf_subsystem *subsystem) 677 { 678 return subsystem->allow_any_host; 679 } 680 681 bool 682 spdk_nvmf_subsystem_host_allowed(struct spdk_nvmf_subsystem *subsystem, const char *hostnqn) 683 { 684 if (!hostnqn) { 685 return false; 686 } 687 688 if (subsystem->allow_any_host) { 689 return true; 690 } 691 692 return _spdk_nvmf_subsystem_find_host(subsystem, hostnqn) != NULL; 693 } 694 695 struct spdk_nvmf_host * 696 spdk_nvmf_subsystem_get_first_host(struct spdk_nvmf_subsystem *subsystem) 697 { 698 return TAILQ_FIRST(&subsystem->hosts); 699 } 700 701 702 struct spdk_nvmf_host * 703 spdk_nvmf_subsystem_get_next_host(struct spdk_nvmf_subsystem *subsystem, 704 struct spdk_nvmf_host *prev_host) 705 { 706 return TAILQ_NEXT(prev_host, link); 707 } 708 709 const char * 710 spdk_nvmf_host_get_nqn(struct spdk_nvmf_host *host) 711 { 712 return host->nqn; 713 } 714 715 static struct spdk_nvmf_listener * 716 _spdk_nvmf_subsystem_find_listener(struct spdk_nvmf_subsystem *subsystem, 717 const struct spdk_nvme_transport_id *trid) 718 { 719 struct spdk_nvmf_listener *listener; 720 721 TAILQ_FOREACH(listener, &subsystem->listeners, link) { 722 if (spdk_nvme_transport_id_compare(&listener->trid, trid) == 0) { 723 return listener; 724 } 725 } 726 727 return NULL; 728 } 729 730 int 731 spdk_nvmf_subsystem_add_listener(struct spdk_nvmf_subsystem *subsystem, 732 struct spdk_nvme_transport_id *trid) 733 { 734 struct spdk_nvmf_transport *transport; 735 struct spdk_nvmf_listener *listener; 736 737 if (!(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE || 738 subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED)) { 739 return -EAGAIN; 740 } 741 742 if (_spdk_nvmf_subsystem_find_listener(subsystem, trid)) { 743 /* Listener already exists in this subsystem */ 744 return 0; 745 } 746 747 transport = spdk_nvmf_tgt_get_transport(subsystem->tgt, trid->trtype); 748 if (transport == NULL) { 749 SPDK_ERRLOG("Unknown transport type %d\n", trid->trtype); 750 return -EINVAL; 751 } 752 753 listener = calloc(1, sizeof(*listener)); 754 if (!listener) { 755 return -ENOMEM; 756 } 757 758 listener->trid = *trid; 759 listener->transport = transport; 760 761 TAILQ_INSERT_HEAD(&subsystem->listeners, listener, link); 762 763 return 0; 764 } 765 766 int 767 spdk_nvmf_subsystem_remove_listener(struct spdk_nvmf_subsystem *subsystem, 768 const struct spdk_nvme_transport_id *trid) 769 { 770 struct spdk_nvmf_listener *listener; 771 772 if (!(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE || 773 subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED)) { 774 return -EAGAIN; 775 } 776 777 listener = _spdk_nvmf_subsystem_find_listener(subsystem, trid); 778 if (listener == NULL) { 779 return -ENOENT; 780 } 781 782 TAILQ_REMOVE(&subsystem->listeners, listener, link); 783 free(listener); 784 785 return 0; 786 } 787 788 /* 789 * TODO: this is the whitelist and will be called during connection setup 790 */ 791 bool 792 spdk_nvmf_subsystem_listener_allowed(struct spdk_nvmf_subsystem *subsystem, 793 struct spdk_nvme_transport_id *trid) 794 { 795 struct spdk_nvmf_listener *listener; 796 797 if (TAILQ_EMPTY(&subsystem->listeners)) { 798 return true; 799 } 800 801 TAILQ_FOREACH(listener, &subsystem->listeners, link) { 802 if (spdk_nvme_transport_id_compare(&listener->trid, trid) == 0) { 803 return true; 804 } 805 } 806 807 return false; 808 } 809 810 struct spdk_nvmf_listener * 811 spdk_nvmf_subsystem_get_first_listener(struct spdk_nvmf_subsystem *subsystem) 812 { 813 return TAILQ_FIRST(&subsystem->listeners); 814 } 815 816 struct spdk_nvmf_listener * 817 spdk_nvmf_subsystem_get_next_listener(struct spdk_nvmf_subsystem *subsystem, 818 struct spdk_nvmf_listener *prev_listener) 819 { 820 return TAILQ_NEXT(prev_listener, link); 821 } 822 823 const struct spdk_nvme_transport_id * 824 spdk_nvmf_listener_get_trid(struct spdk_nvmf_listener *listener) 825 { 826 return &listener->trid; 827 } 828 829 struct subsystem_update_ns_ctx { 830 struct spdk_nvmf_subsystem *subsystem; 831 832 spdk_nvmf_subsystem_state_change_done cb_fn; 833 void *cb_arg; 834 }; 835 836 static void 837 subsystem_update_ns_done(struct spdk_io_channel_iter *i, int status) 838 { 839 struct subsystem_update_ns_ctx *ctx = spdk_io_channel_iter_get_ctx(i); 840 841 if (ctx->cb_fn) { 842 ctx->cb_fn(ctx->subsystem, ctx->cb_arg, status); 843 } 844 free(ctx); 845 } 846 847 static void 848 subsystem_update_ns_on_pg(struct spdk_io_channel_iter *i) 849 { 850 int rc; 851 struct subsystem_update_ns_ctx *ctx; 852 struct spdk_nvmf_poll_group *group; 853 struct spdk_nvmf_subsystem *subsystem; 854 855 ctx = spdk_io_channel_iter_get_ctx(i); 856 group = spdk_io_channel_get_ctx(spdk_io_channel_iter_get_channel(i)); 857 subsystem = ctx->subsystem; 858 859 rc = spdk_nvmf_poll_group_update_subsystem(group, subsystem); 860 spdk_for_each_channel_continue(i, rc); 861 } 862 863 static int 864 spdk_nvmf_subsystem_update_ns(struct spdk_nvmf_subsystem *subsystem, spdk_channel_for_each_cpl cpl, 865 void *ctx) 866 { 867 spdk_for_each_channel(subsystem->tgt, 868 subsystem_update_ns_on_pg, 869 ctx, 870 cpl); 871 872 return 0; 873 } 874 875 static void 876 spdk_nvmf_subsystem_ns_changed(struct spdk_nvmf_subsystem *subsystem, uint32_t nsid) 877 { 878 struct spdk_nvmf_ctrlr *ctrlr; 879 880 TAILQ_FOREACH(ctrlr, &subsystem->ctrlrs, link) { 881 spdk_nvmf_ctrlr_ns_changed(ctrlr, nsid); 882 } 883 } 884 885 static int 886 _spdk_nvmf_subsystem_remove_ns(struct spdk_nvmf_subsystem *subsystem, uint32_t nsid) 887 { 888 struct spdk_nvmf_ns *ns; 889 890 assert(subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED || 891 subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE); 892 893 if (nsid == 0 || nsid > subsystem->max_nsid) { 894 return -1; 895 } 896 897 if (!(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE || 898 subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED)) { 899 return -1; 900 } 901 902 ns = subsystem->ns[nsid - 1]; 903 if (!ns) { 904 return -1; 905 } 906 907 subsystem->ns[nsid - 1] = NULL; 908 909 spdk_bdev_module_release_bdev(ns->bdev); 910 spdk_bdev_close(ns->desc); 911 free(ns); 912 913 spdk_nvmf_subsystem_ns_changed(subsystem, nsid); 914 915 return 0; 916 } 917 918 int 919 spdk_nvmf_subsystem_remove_ns(struct spdk_nvmf_subsystem *subsystem, uint32_t nsid, 920 spdk_nvmf_subsystem_state_change_done cb_fn, void *cb_arg) 921 { 922 int rc; 923 struct subsystem_update_ns_ctx *ctx; 924 925 rc = _spdk_nvmf_subsystem_remove_ns(subsystem, nsid); 926 if (rc < 0) { 927 return rc; 928 } 929 930 ctx = calloc(1, sizeof(*ctx)); 931 932 if (ctx == NULL) { 933 return -ENOMEM; 934 } 935 936 ctx->subsystem = subsystem; 937 ctx->cb_fn = cb_fn; 938 ctx->cb_arg = cb_arg; 939 940 spdk_nvmf_subsystem_update_ns(subsystem, subsystem_update_ns_done, ctx); 941 942 return 0; 943 } 944 945 static void 946 _spdk_nvmf_ns_hot_remove_done(struct spdk_nvmf_subsystem *subsystem, void *cb_arg, int status) 947 { 948 if (status != 0) { 949 SPDK_ERRLOG("Failed to make changes to NVMe-oF subsystem with id %u\n", subsystem->id); 950 } 951 spdk_nvmf_subsystem_resume(subsystem, NULL, NULL); 952 } 953 954 static void 955 _spdk_nvmf_ns_hot_remove(struct spdk_nvmf_subsystem *subsystem, 956 void *cb_arg, int status) 957 { 958 struct spdk_nvmf_ns *ns = cb_arg; 959 960 spdk_nvmf_subsystem_remove_ns(subsystem, ns->opts.nsid, _spdk_nvmf_ns_hot_remove_done, 961 subsystem); 962 } 963 964 static void 965 spdk_nvmf_ns_hot_remove(void *remove_ctx) 966 { 967 struct spdk_nvmf_ns *ns = remove_ctx; 968 int rc; 969 970 rc = spdk_nvmf_subsystem_pause(ns->subsystem, _spdk_nvmf_ns_hot_remove, ns); 971 if (rc) { 972 SPDK_ERRLOG("Unable to pause subsystem to process namespace removal!\n"); 973 } 974 } 975 976 void 977 spdk_nvmf_ns_opts_get_defaults(struct spdk_nvmf_ns_opts *opts, size_t opts_size) 978 { 979 /* All current fields are set to 0 by default. */ 980 memset(opts, 0, opts_size); 981 } 982 983 /* Dummy bdev module used to to claim bdevs. */ 984 static struct spdk_bdev_module ns_bdev_module = { 985 .name = "NVMe-oF Target", 986 }; 987 988 uint32_t 989 spdk_nvmf_subsystem_add_ns(struct spdk_nvmf_subsystem *subsystem, struct spdk_bdev *bdev, 990 const struct spdk_nvmf_ns_opts *user_opts, size_t opts_size) 991 { 992 struct spdk_nvmf_ns_opts opts; 993 struct spdk_nvmf_ns *ns; 994 int rc; 995 996 if (!(subsystem->state == SPDK_NVMF_SUBSYSTEM_INACTIVE || 997 subsystem->state == SPDK_NVMF_SUBSYSTEM_PAUSED)) { 998 return 0; 999 } 1000 1001 spdk_nvmf_ns_opts_get_defaults(&opts, sizeof(opts)); 1002 if (user_opts) { 1003 memcpy(&opts, user_opts, spdk_min(sizeof(opts), opts_size)); 1004 } 1005 1006 if (spdk_mem_all_zero(&opts.uuid, sizeof(opts.uuid))) { 1007 opts.uuid = *spdk_bdev_get_uuid(bdev); 1008 } 1009 1010 if (opts.nsid == SPDK_NVME_GLOBAL_NS_TAG) { 1011 SPDK_ERRLOG("Invalid NSID %" PRIu32 "\n", opts.nsid); 1012 return 0; 1013 } 1014 1015 if (opts.nsid == 0) { 1016 /* 1017 * NSID not specified - find a free index. 1018 * 1019 * If no free slots are found, opts.nsid will be subsystem->max_nsid + 1, which will 1020 * expand max_nsid if possible. 1021 */ 1022 for (opts.nsid = 1; opts.nsid <= subsystem->max_nsid; opts.nsid++) { 1023 if (_spdk_nvmf_subsystem_get_ns(subsystem, opts.nsid) == NULL) { 1024 break; 1025 } 1026 } 1027 } 1028 1029 if (_spdk_nvmf_subsystem_get_ns(subsystem, opts.nsid)) { 1030 SPDK_ERRLOG("Requested NSID %" PRIu32 " already in use\n", opts.nsid); 1031 return 0; 1032 } 1033 1034 if (opts.nsid > subsystem->max_nsid) { 1035 struct spdk_nvmf_ns **new_ns_array; 1036 1037 /* If MaxNamespaces was specified, we can't extend max_nsid beyond it. */ 1038 if (subsystem->max_allowed_nsid > 0 && opts.nsid > subsystem->max_allowed_nsid) { 1039 SPDK_ERRLOG("Can't extend NSID range above MaxNamespaces\n"); 1040 return 0; 1041 } 1042 1043 /* If a controller is connected, we can't change NN. */ 1044 if (!TAILQ_EMPTY(&subsystem->ctrlrs)) { 1045 SPDK_ERRLOG("Can't extend NSID range while controllers are connected\n"); 1046 return 0; 1047 } 1048 1049 new_ns_array = realloc(subsystem->ns, sizeof(struct spdk_nvmf_ns *) * opts.nsid); 1050 if (new_ns_array == NULL) { 1051 SPDK_ERRLOG("Memory allocation error while resizing namespace array.\n"); 1052 return 0; 1053 } 1054 1055 memset(new_ns_array + subsystem->max_nsid, 0, 1056 sizeof(struct spdk_nvmf_ns *) * (opts.nsid - subsystem->max_nsid)); 1057 subsystem->ns = new_ns_array; 1058 subsystem->max_nsid = opts.nsid; 1059 } 1060 1061 ns = calloc(1, sizeof(*ns)); 1062 if (ns == NULL) { 1063 SPDK_ERRLOG("Namespace allocation failed\n"); 1064 return 0; 1065 } 1066 1067 ns->bdev = bdev; 1068 ns->opts = opts; 1069 ns->subsystem = subsystem; 1070 rc = spdk_bdev_open(bdev, true, spdk_nvmf_ns_hot_remove, ns, &ns->desc); 1071 if (rc != 0) { 1072 SPDK_ERRLOG("Subsystem %s: bdev %s cannot be opened, error=%d\n", 1073 subsystem->subnqn, spdk_bdev_get_name(bdev), rc); 1074 free(ns); 1075 return 0; 1076 } 1077 rc = spdk_bdev_module_claim_bdev(bdev, ns->desc, &ns_bdev_module); 1078 if (rc != 0) { 1079 spdk_bdev_close(ns->desc); 1080 free(ns); 1081 return 0; 1082 } 1083 subsystem->ns[opts.nsid - 1] = ns; 1084 1085 SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Subsystem %s: bdev %s assigned nsid %" PRIu32 "\n", 1086 spdk_nvmf_subsystem_get_nqn(subsystem), 1087 spdk_bdev_get_name(bdev), 1088 opts.nsid); 1089 1090 spdk_nvmf_subsystem_ns_changed(subsystem, opts.nsid); 1091 1092 return opts.nsid; 1093 } 1094 1095 static uint32_t 1096 spdk_nvmf_subsystem_get_next_allocated_nsid(struct spdk_nvmf_subsystem *subsystem, 1097 uint32_t prev_nsid) 1098 { 1099 uint32_t nsid; 1100 1101 if (prev_nsid >= subsystem->max_nsid) { 1102 return 0; 1103 } 1104 1105 for (nsid = prev_nsid + 1; nsid <= subsystem->max_nsid; nsid++) { 1106 if (subsystem->ns[nsid - 1]) { 1107 return nsid; 1108 } 1109 } 1110 1111 return 0; 1112 } 1113 1114 struct spdk_nvmf_ns * 1115 spdk_nvmf_subsystem_get_first_ns(struct spdk_nvmf_subsystem *subsystem) 1116 { 1117 uint32_t first_nsid; 1118 1119 first_nsid = spdk_nvmf_subsystem_get_next_allocated_nsid(subsystem, 0); 1120 return _spdk_nvmf_subsystem_get_ns(subsystem, first_nsid); 1121 } 1122 1123 struct spdk_nvmf_ns * 1124 spdk_nvmf_subsystem_get_next_ns(struct spdk_nvmf_subsystem *subsystem, 1125 struct spdk_nvmf_ns *prev_ns) 1126 { 1127 uint32_t next_nsid; 1128 1129 next_nsid = spdk_nvmf_subsystem_get_next_allocated_nsid(subsystem, prev_ns->opts.nsid); 1130 return _spdk_nvmf_subsystem_get_ns(subsystem, next_nsid); 1131 } 1132 1133 struct spdk_nvmf_ns * 1134 spdk_nvmf_subsystem_get_ns(struct spdk_nvmf_subsystem *subsystem, uint32_t nsid) 1135 { 1136 return _spdk_nvmf_subsystem_get_ns(subsystem, nsid); 1137 } 1138 1139 uint32_t 1140 spdk_nvmf_ns_get_id(const struct spdk_nvmf_ns *ns) 1141 { 1142 return ns->opts.nsid; 1143 } 1144 1145 struct spdk_bdev * 1146 spdk_nvmf_ns_get_bdev(struct spdk_nvmf_ns *ns) 1147 { 1148 return ns->bdev; 1149 } 1150 1151 void 1152 spdk_nvmf_ns_get_opts(const struct spdk_nvmf_ns *ns, struct spdk_nvmf_ns_opts *opts, 1153 size_t opts_size) 1154 { 1155 memset(opts, 0, opts_size); 1156 memcpy(opts, &ns->opts, spdk_min(sizeof(ns->opts), opts_size)); 1157 } 1158 1159 const char * 1160 spdk_nvmf_subsystem_get_sn(const struct spdk_nvmf_subsystem *subsystem) 1161 { 1162 return subsystem->sn; 1163 } 1164 1165 int 1166 spdk_nvmf_subsystem_set_sn(struct spdk_nvmf_subsystem *subsystem, const char *sn) 1167 { 1168 size_t len, max_len; 1169 1170 max_len = sizeof(subsystem->sn) - 1; 1171 len = strlen(sn); 1172 if (len > max_len) { 1173 SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Invalid sn \"%s\": length %zu > max %zu\n", 1174 sn, len, max_len); 1175 return -1; 1176 } 1177 1178 if (!spdk_nvmf_valid_ascii_string(sn, len)) { 1179 SPDK_DEBUGLOG(SPDK_LOG_NVMF, "Non-ASCII sn\n"); 1180 SPDK_TRACEDUMP(SPDK_LOG_NVMF, "sn", sn, len); 1181 return -1; 1182 } 1183 1184 snprintf(subsystem->sn, sizeof(subsystem->sn), "%s", sn); 1185 1186 return 0; 1187 } 1188 1189 const char * 1190 spdk_nvmf_subsystem_get_nqn(struct spdk_nvmf_subsystem *subsystem) 1191 { 1192 return subsystem->subnqn; 1193 } 1194 1195 /* Workaround for astyle formatting bug */ 1196 typedef enum spdk_nvmf_subtype nvmf_subtype_t; 1197 1198 nvmf_subtype_t 1199 spdk_nvmf_subsystem_get_type(struct spdk_nvmf_subsystem *subsystem) 1200 { 1201 return subsystem->subtype; 1202 } 1203 1204 static uint16_t 1205 spdk_nvmf_subsystem_gen_cntlid(struct spdk_nvmf_subsystem *subsystem) 1206 { 1207 int count; 1208 1209 /* 1210 * In the worst case, we might have to try all CNTLID values between 1 and 0xFFF0 - 1 1211 * before we find one that is unused (or find that all values are in use). 1212 */ 1213 for (count = 0; count < 0xFFF0 - 1; count++) { 1214 subsystem->next_cntlid++; 1215 if (subsystem->next_cntlid >= 0xFFF0) { 1216 /* The spec reserves cntlid values in the range FFF0h to FFFFh. */ 1217 subsystem->next_cntlid = 1; 1218 } 1219 1220 /* Check if a controller with this cntlid currently exists. */ 1221 if (spdk_nvmf_subsystem_get_ctrlr(subsystem, subsystem->next_cntlid) == NULL) { 1222 /* Found unused cntlid */ 1223 return subsystem->next_cntlid; 1224 } 1225 } 1226 1227 /* All valid cntlid values are in use. */ 1228 return 0xFFFF; 1229 } 1230 1231 int 1232 spdk_nvmf_subsystem_add_ctrlr(struct spdk_nvmf_subsystem *subsystem, struct spdk_nvmf_ctrlr *ctrlr) 1233 { 1234 ctrlr->cntlid = spdk_nvmf_subsystem_gen_cntlid(subsystem); 1235 if (ctrlr->cntlid == 0xFFFF) { 1236 /* Unable to get a cntlid */ 1237 SPDK_ERRLOG("Reached max simultaneous ctrlrs\n"); 1238 return -EBUSY; 1239 } 1240 1241 TAILQ_INSERT_TAIL(&subsystem->ctrlrs, ctrlr, link); 1242 1243 return 0; 1244 } 1245 1246 void 1247 spdk_nvmf_subsystem_remove_ctrlr(struct spdk_nvmf_subsystem *subsystem, 1248 struct spdk_nvmf_ctrlr *ctrlr) 1249 { 1250 assert(subsystem == ctrlr->subsys); 1251 TAILQ_REMOVE(&subsystem->ctrlrs, ctrlr, link); 1252 } 1253 1254 struct spdk_nvmf_ctrlr * 1255 spdk_nvmf_subsystem_get_ctrlr(struct spdk_nvmf_subsystem *subsystem, uint16_t cntlid) 1256 { 1257 struct spdk_nvmf_ctrlr *ctrlr; 1258 1259 TAILQ_FOREACH(ctrlr, &subsystem->ctrlrs, link) { 1260 if (ctrlr->cntlid == cntlid) { 1261 return ctrlr; 1262 } 1263 } 1264 1265 return NULL; 1266 } 1267 1268 uint32_t 1269 spdk_nvmf_subsystem_get_max_namespaces(const struct spdk_nvmf_subsystem *subsystem) 1270 { 1271 return subsystem->max_allowed_nsid; 1272 } 1273