1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NVMe over Fabrics common host code. 4 * Copyright (c) 2015-2016 HGST, a Western Digital Company. 5 */ 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 #include <linux/init.h> 8 #include <linux/miscdevice.h> 9 #include <linux/module.h> 10 #include <linux/mutex.h> 11 #include <linux/parser.h> 12 #include <linux/seq_file.h> 13 #include "nvme.h" 14 #include "fabrics.h" 15 16 static LIST_HEAD(nvmf_transports); 17 static DECLARE_RWSEM(nvmf_transports_rwsem); 18 19 static LIST_HEAD(nvmf_hosts); 20 static DEFINE_MUTEX(nvmf_hosts_mutex); 21 22 static struct nvmf_host *nvmf_default_host; 23 24 static struct nvmf_host *nvmf_host_alloc(const char *hostnqn, uuid_t *id) 25 { 26 struct nvmf_host *host; 27 28 host = kmalloc(sizeof(*host), GFP_KERNEL); 29 if (!host) 30 return NULL; 31 32 kref_init(&host->ref); 33 uuid_copy(&host->id, id); 34 strscpy(host->nqn, hostnqn, NVMF_NQN_SIZE); 35 36 return host; 37 } 38 39 static struct nvmf_host *nvmf_host_add(const char *hostnqn, uuid_t *id) 40 { 41 struct nvmf_host *host; 42 43 mutex_lock(&nvmf_hosts_mutex); 44 45 /* 46 * We have defined a host as how it is perceived by the target. 47 * Therefore, we don't allow different Host NQNs with the same Host ID. 48 * Similarly, we do not allow the usage of the same Host NQN with 49 * different Host IDs. This'll maintain unambiguous host identification. 50 */ 51 list_for_each_entry(host, &nvmf_hosts, list) { 52 bool same_hostnqn = !strcmp(host->nqn, hostnqn); 53 bool same_hostid = uuid_equal(&host->id, id); 54 55 if (same_hostnqn && same_hostid) { 56 kref_get(&host->ref); 57 goto out_unlock; 58 } 59 if (same_hostnqn) { 60 pr_err("found same hostnqn %s but different hostid %pUb\n", 61 hostnqn, id); 62 host = ERR_PTR(-EINVAL); 63 goto out_unlock; 64 } 65 if (same_hostid) { 66 pr_err("found same hostid %pUb but different hostnqn %s\n", 67 id, hostnqn); 68 host = ERR_PTR(-EINVAL); 69 goto out_unlock; 70 } 71 } 72 73 host = nvmf_host_alloc(hostnqn, id); 74 if (!host) { 75 host = ERR_PTR(-ENOMEM); 76 goto out_unlock; 77 } 78 79 list_add_tail(&host->list, &nvmf_hosts); 80 out_unlock: 81 mutex_unlock(&nvmf_hosts_mutex); 82 return host; 83 } 84 85 static struct nvmf_host *nvmf_host_default(void) 86 { 87 struct nvmf_host *host; 88 char nqn[NVMF_NQN_SIZE]; 89 uuid_t id; 90 91 uuid_gen(&id); 92 snprintf(nqn, NVMF_NQN_SIZE, 93 "nqn.2014-08.org.nvmexpress:uuid:%pUb", &id); 94 95 host = nvmf_host_alloc(nqn, &id); 96 if (!host) 97 return NULL; 98 99 mutex_lock(&nvmf_hosts_mutex); 100 list_add_tail(&host->list, &nvmf_hosts); 101 mutex_unlock(&nvmf_hosts_mutex); 102 103 return host; 104 } 105 106 static void nvmf_host_destroy(struct kref *ref) 107 { 108 struct nvmf_host *host = container_of(ref, struct nvmf_host, ref); 109 110 mutex_lock(&nvmf_hosts_mutex); 111 list_del(&host->list); 112 mutex_unlock(&nvmf_hosts_mutex); 113 114 kfree(host); 115 } 116 117 static void nvmf_host_put(struct nvmf_host *host) 118 { 119 if (host) 120 kref_put(&host->ref, nvmf_host_destroy); 121 } 122 123 /** 124 * nvmf_get_address() - Get address/port 125 * @ctrl: Host NVMe controller instance which we got the address 126 * @buf: OUTPUT parameter that will contain the address/port 127 * @size: buffer size 128 */ 129 int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size) 130 { 131 int len = 0; 132 133 if (ctrl->opts->mask & NVMF_OPT_TRADDR) 134 len += scnprintf(buf, size, "traddr=%s", ctrl->opts->traddr); 135 if (ctrl->opts->mask & NVMF_OPT_TRSVCID) 136 len += scnprintf(buf + len, size - len, "%strsvcid=%s", 137 (len) ? "," : "", ctrl->opts->trsvcid); 138 if (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR) 139 len += scnprintf(buf + len, size - len, "%shost_traddr=%s", 140 (len) ? "," : "", ctrl->opts->host_traddr); 141 if (ctrl->opts->mask & NVMF_OPT_HOST_IFACE) 142 len += scnprintf(buf + len, size - len, "%shost_iface=%s", 143 (len) ? "," : "", ctrl->opts->host_iface); 144 len += scnprintf(buf + len, size - len, "\n"); 145 146 return len; 147 } 148 EXPORT_SYMBOL_GPL(nvmf_get_address); 149 150 /** 151 * nvmf_reg_read32() - NVMe Fabrics "Property Get" API function. 152 * @ctrl: Host NVMe controller instance maintaining the admin 153 * queue used to submit the property read command to 154 * the allocated NVMe controller resource on the target system. 155 * @off: Starting offset value of the targeted property 156 * register (see the fabrics section of the NVMe standard). 157 * @val: OUTPUT parameter that will contain the value of 158 * the property after a successful read. 159 * 160 * Used by the host system to retrieve a 32-bit capsule property value 161 * from an NVMe controller on the target system. 162 * 163 * ("Capsule property" is an "PCIe register concept" applied to the 164 * NVMe fabrics space.) 165 * 166 * Return: 167 * 0: successful read 168 * > 0: NVMe error status code 169 * < 0: Linux errno error code 170 */ 171 int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val) 172 { 173 struct nvme_command cmd = { }; 174 union nvme_result res; 175 int ret; 176 177 cmd.prop_get.opcode = nvme_fabrics_command; 178 cmd.prop_get.fctype = nvme_fabrics_type_property_get; 179 cmd.prop_get.offset = cpu_to_le32(off); 180 181 ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res, NULL, 0, 182 NVME_QID_ANY, 0, 0); 183 184 if (ret >= 0) 185 *val = le64_to_cpu(res.u64); 186 if (unlikely(ret != 0)) 187 dev_err(ctrl->device, 188 "Property Get error: %d, offset %#x\n", 189 ret > 0 ? ret & ~NVME_SC_DNR : ret, off); 190 191 return ret; 192 } 193 EXPORT_SYMBOL_GPL(nvmf_reg_read32); 194 195 /** 196 * nvmf_reg_read64() - NVMe Fabrics "Property Get" API function. 197 * @ctrl: Host NVMe controller instance maintaining the admin 198 * queue used to submit the property read command to 199 * the allocated controller resource on the target system. 200 * @off: Starting offset value of the targeted property 201 * register (see the fabrics section of the NVMe standard). 202 * @val: OUTPUT parameter that will contain the value of 203 * the property after a successful read. 204 * 205 * Used by the host system to retrieve a 64-bit capsule property value 206 * from an NVMe controller on the target system. 207 * 208 * ("Capsule property" is an "PCIe register concept" applied to the 209 * NVMe fabrics space.) 210 * 211 * Return: 212 * 0: successful read 213 * > 0: NVMe error status code 214 * < 0: Linux errno error code 215 */ 216 int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) 217 { 218 struct nvme_command cmd = { }; 219 union nvme_result res; 220 int ret; 221 222 cmd.prop_get.opcode = nvme_fabrics_command; 223 cmd.prop_get.fctype = nvme_fabrics_type_property_get; 224 cmd.prop_get.attrib = 1; 225 cmd.prop_get.offset = cpu_to_le32(off); 226 227 ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res, NULL, 0, 228 NVME_QID_ANY, 0, 0); 229 230 if (ret >= 0) 231 *val = le64_to_cpu(res.u64); 232 if (unlikely(ret != 0)) 233 dev_err(ctrl->device, 234 "Property Get error: %d, offset %#x\n", 235 ret > 0 ? ret & ~NVME_SC_DNR : ret, off); 236 return ret; 237 } 238 EXPORT_SYMBOL_GPL(nvmf_reg_read64); 239 240 /** 241 * nvmf_reg_write32() - NVMe Fabrics "Property Write" API function. 242 * @ctrl: Host NVMe controller instance maintaining the admin 243 * queue used to submit the property read command to 244 * the allocated NVMe controller resource on the target system. 245 * @off: Starting offset value of the targeted property 246 * register (see the fabrics section of the NVMe standard). 247 * @val: Input parameter that contains the value to be 248 * written to the property. 249 * 250 * Used by the NVMe host system to write a 32-bit capsule property value 251 * to an NVMe controller on the target system. 252 * 253 * ("Capsule property" is an "PCIe register concept" applied to the 254 * NVMe fabrics space.) 255 * 256 * Return: 257 * 0: successful write 258 * > 0: NVMe error status code 259 * < 0: Linux errno error code 260 */ 261 int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val) 262 { 263 struct nvme_command cmd = { }; 264 int ret; 265 266 cmd.prop_set.opcode = nvme_fabrics_command; 267 cmd.prop_set.fctype = nvme_fabrics_type_property_set; 268 cmd.prop_set.attrib = 0; 269 cmd.prop_set.offset = cpu_to_le32(off); 270 cmd.prop_set.value = cpu_to_le64(val); 271 272 ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, NULL, NULL, 0, 273 NVME_QID_ANY, 0, 0); 274 if (unlikely(ret)) 275 dev_err(ctrl->device, 276 "Property Set error: %d, offset %#x\n", 277 ret > 0 ? ret & ~NVME_SC_DNR : ret, off); 278 return ret; 279 } 280 EXPORT_SYMBOL_GPL(nvmf_reg_write32); 281 282 /** 283 * nvmf_log_connect_error() - Error-parsing-diagnostic print out function for 284 * connect() errors. 285 * @ctrl: The specific /dev/nvmeX device that had the error. 286 * @errval: Error code to be decoded in a more human-friendly 287 * printout. 288 * @offset: For use with the NVMe error code 289 * NVME_SC_CONNECT_INVALID_PARAM. 290 * @cmd: This is the SQE portion of a submission capsule. 291 * @data: This is the "Data" portion of a submission capsule. 292 */ 293 static void nvmf_log_connect_error(struct nvme_ctrl *ctrl, 294 int errval, int offset, struct nvme_command *cmd, 295 struct nvmf_connect_data *data) 296 { 297 int err_sctype = errval & ~NVME_SC_DNR; 298 299 if (errval < 0) { 300 dev_err(ctrl->device, 301 "Connect command failed, errno: %d\n", errval); 302 return; 303 } 304 305 switch (err_sctype) { 306 case NVME_SC_CONNECT_INVALID_PARAM: 307 if (offset >> 16) { 308 char *inv_data = "Connect Invalid Data Parameter"; 309 310 switch (offset & 0xffff) { 311 case (offsetof(struct nvmf_connect_data, cntlid)): 312 dev_err(ctrl->device, 313 "%s, cntlid: %d\n", 314 inv_data, data->cntlid); 315 break; 316 case (offsetof(struct nvmf_connect_data, hostnqn)): 317 dev_err(ctrl->device, 318 "%s, hostnqn \"%s\"\n", 319 inv_data, data->hostnqn); 320 break; 321 case (offsetof(struct nvmf_connect_data, subsysnqn)): 322 dev_err(ctrl->device, 323 "%s, subsysnqn \"%s\"\n", 324 inv_data, data->subsysnqn); 325 break; 326 default: 327 dev_err(ctrl->device, 328 "%s, starting byte offset: %d\n", 329 inv_data, offset & 0xffff); 330 break; 331 } 332 } else { 333 char *inv_sqe = "Connect Invalid SQE Parameter"; 334 335 switch (offset) { 336 case (offsetof(struct nvmf_connect_command, qid)): 337 dev_err(ctrl->device, 338 "%s, qid %d\n", 339 inv_sqe, cmd->connect.qid); 340 break; 341 default: 342 dev_err(ctrl->device, 343 "%s, starting byte offset: %d\n", 344 inv_sqe, offset); 345 } 346 } 347 break; 348 case NVME_SC_CONNECT_INVALID_HOST: 349 dev_err(ctrl->device, 350 "Connect for subsystem %s is not allowed, hostnqn: %s\n", 351 data->subsysnqn, data->hostnqn); 352 break; 353 case NVME_SC_CONNECT_CTRL_BUSY: 354 dev_err(ctrl->device, 355 "Connect command failed: controller is busy or not available\n"); 356 break; 357 case NVME_SC_CONNECT_FORMAT: 358 dev_err(ctrl->device, 359 "Connect incompatible format: %d", 360 cmd->connect.recfmt); 361 break; 362 case NVME_SC_HOST_PATH_ERROR: 363 dev_err(ctrl->device, 364 "Connect command failed: host path error\n"); 365 break; 366 case NVME_SC_AUTH_REQUIRED: 367 dev_err(ctrl->device, 368 "Connect command failed: authentication required\n"); 369 break; 370 default: 371 dev_err(ctrl->device, 372 "Connect command failed, error wo/DNR bit: %d\n", 373 err_sctype); 374 break; 375 } 376 } 377 378 static struct nvmf_connect_data *nvmf_connect_data_prep(struct nvme_ctrl *ctrl, 379 u16 cntlid) 380 { 381 struct nvmf_connect_data *data; 382 383 data = kzalloc(sizeof(*data), GFP_KERNEL); 384 if (!data) 385 return NULL; 386 387 uuid_copy(&data->hostid, &ctrl->opts->host->id); 388 data->cntlid = cpu_to_le16(cntlid); 389 strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE); 390 strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE); 391 392 return data; 393 } 394 395 static void nvmf_connect_cmd_prep(struct nvme_ctrl *ctrl, u16 qid, 396 struct nvme_command *cmd) 397 { 398 cmd->connect.opcode = nvme_fabrics_command; 399 cmd->connect.fctype = nvme_fabrics_type_connect; 400 cmd->connect.qid = cpu_to_le16(qid); 401 402 if (qid) { 403 cmd->connect.sqsize = cpu_to_le16(ctrl->sqsize); 404 } else { 405 cmd->connect.sqsize = cpu_to_le16(NVME_AQ_DEPTH - 1); 406 407 /* 408 * set keep-alive timeout in seconds granularity (ms * 1000) 409 */ 410 cmd->connect.kato = cpu_to_le32(ctrl->kato * 1000); 411 } 412 413 if (ctrl->opts->disable_sqflow) 414 cmd->connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW; 415 } 416 417 /** 418 * nvmf_connect_admin_queue() - NVMe Fabrics Admin Queue "Connect" 419 * API function. 420 * @ctrl: Host nvme controller instance used to request 421 * a new NVMe controller allocation on the target 422 * system and establish an NVMe Admin connection to 423 * that controller. 424 * 425 * This function enables an NVMe host device to request a new allocation of 426 * an NVMe controller resource on a target system as well establish a 427 * fabrics-protocol connection of the NVMe Admin queue between the 428 * host system device and the allocated NVMe controller on the 429 * target system via a NVMe Fabrics "Connect" command. 430 * 431 * Return: 432 * 0: success 433 * > 0: NVMe error status code 434 * < 0: Linux errno error code 435 * 436 */ 437 int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl) 438 { 439 struct nvme_command cmd = { }; 440 union nvme_result res; 441 struct nvmf_connect_data *data; 442 int ret; 443 u32 result; 444 445 nvmf_connect_cmd_prep(ctrl, 0, &cmd); 446 447 data = nvmf_connect_data_prep(ctrl, 0xffff); 448 if (!data) 449 return -ENOMEM; 450 451 ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res, 452 data, sizeof(*data), NVME_QID_ANY, 1, 453 BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT); 454 if (ret) { 455 nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32), 456 &cmd, data); 457 goto out_free_data; 458 } 459 460 result = le32_to_cpu(res.u32); 461 ctrl->cntlid = result & 0xFFFF; 462 if (result & (NVME_CONNECT_AUTHREQ_ATR | NVME_CONNECT_AUTHREQ_ASCR)) { 463 /* Secure concatenation is not implemented */ 464 if (result & NVME_CONNECT_AUTHREQ_ASCR) { 465 dev_warn(ctrl->device, 466 "qid 0: secure concatenation is not supported\n"); 467 ret = NVME_SC_AUTH_REQUIRED; 468 goto out_free_data; 469 } 470 /* Authentication required */ 471 ret = nvme_auth_negotiate(ctrl, 0); 472 if (ret) { 473 dev_warn(ctrl->device, 474 "qid 0: authentication setup failed\n"); 475 ret = NVME_SC_AUTH_REQUIRED; 476 goto out_free_data; 477 } 478 ret = nvme_auth_wait(ctrl, 0); 479 if (ret) 480 dev_warn(ctrl->device, 481 "qid 0: authentication failed\n"); 482 else 483 dev_info(ctrl->device, 484 "qid 0: authenticated\n"); 485 } 486 out_free_data: 487 kfree(data); 488 return ret; 489 } 490 EXPORT_SYMBOL_GPL(nvmf_connect_admin_queue); 491 492 /** 493 * nvmf_connect_io_queue() - NVMe Fabrics I/O Queue "Connect" 494 * API function. 495 * @ctrl: Host nvme controller instance used to establish an 496 * NVMe I/O queue connection to the already allocated NVMe 497 * controller on the target system. 498 * @qid: NVMe I/O queue number for the new I/O connection between 499 * host and target (note qid == 0 is illegal as this is 500 * the Admin queue, per NVMe standard). 501 * 502 * This function issues a fabrics-protocol connection 503 * of a NVMe I/O queue (via NVMe Fabrics "Connect" command) 504 * between the host system device and the allocated NVMe controller 505 * on the target system. 506 * 507 * Return: 508 * 0: success 509 * > 0: NVMe error status code 510 * < 0: Linux errno error code 511 */ 512 int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid) 513 { 514 struct nvme_command cmd = { }; 515 struct nvmf_connect_data *data; 516 union nvme_result res; 517 int ret; 518 u32 result; 519 520 nvmf_connect_cmd_prep(ctrl, qid, &cmd); 521 522 data = nvmf_connect_data_prep(ctrl, ctrl->cntlid); 523 if (!data) 524 return -ENOMEM; 525 526 ret = __nvme_submit_sync_cmd(ctrl->connect_q, &cmd, &res, 527 data, sizeof(*data), qid, 1, 528 BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT); 529 if (ret) { 530 nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32), 531 &cmd, data); 532 } 533 result = le32_to_cpu(res.u32); 534 if (result & (NVME_CONNECT_AUTHREQ_ATR | NVME_CONNECT_AUTHREQ_ASCR)) { 535 /* Secure concatenation is not implemented */ 536 if (result & NVME_CONNECT_AUTHREQ_ASCR) { 537 dev_warn(ctrl->device, 538 "qid 0: secure concatenation is not supported\n"); 539 ret = NVME_SC_AUTH_REQUIRED; 540 goto out_free_data; 541 } 542 /* Authentication required */ 543 ret = nvme_auth_negotiate(ctrl, qid); 544 if (ret) { 545 dev_warn(ctrl->device, 546 "qid %d: authentication setup failed\n", qid); 547 ret = NVME_SC_AUTH_REQUIRED; 548 } else { 549 ret = nvme_auth_wait(ctrl, qid); 550 if (ret) 551 dev_warn(ctrl->device, 552 "qid %u: authentication failed\n", qid); 553 } 554 } 555 out_free_data: 556 kfree(data); 557 return ret; 558 } 559 EXPORT_SYMBOL_GPL(nvmf_connect_io_queue); 560 561 bool nvmf_should_reconnect(struct nvme_ctrl *ctrl) 562 { 563 if (ctrl->opts->max_reconnects == -1 || 564 ctrl->nr_reconnects < ctrl->opts->max_reconnects) 565 return true; 566 567 return false; 568 } 569 EXPORT_SYMBOL_GPL(nvmf_should_reconnect); 570 571 /** 572 * nvmf_register_transport() - NVMe Fabrics Library registration function. 573 * @ops: Transport ops instance to be registered to the 574 * common fabrics library. 575 * 576 * API function that registers the type of specific transport fabric 577 * being implemented to the common NVMe fabrics library. Part of 578 * the overall init sequence of starting up a fabrics driver. 579 */ 580 int nvmf_register_transport(struct nvmf_transport_ops *ops) 581 { 582 if (!ops->create_ctrl) 583 return -EINVAL; 584 585 down_write(&nvmf_transports_rwsem); 586 list_add_tail(&ops->entry, &nvmf_transports); 587 up_write(&nvmf_transports_rwsem); 588 589 return 0; 590 } 591 EXPORT_SYMBOL_GPL(nvmf_register_transport); 592 593 /** 594 * nvmf_unregister_transport() - NVMe Fabrics Library unregistration function. 595 * @ops: Transport ops instance to be unregistered from the 596 * common fabrics library. 597 * 598 * Fabrics API function that unregisters the type of specific transport 599 * fabric being implemented from the common NVMe fabrics library. 600 * Part of the overall exit sequence of unloading the implemented driver. 601 */ 602 void nvmf_unregister_transport(struct nvmf_transport_ops *ops) 603 { 604 down_write(&nvmf_transports_rwsem); 605 list_del(&ops->entry); 606 up_write(&nvmf_transports_rwsem); 607 } 608 EXPORT_SYMBOL_GPL(nvmf_unregister_transport); 609 610 static struct nvmf_transport_ops *nvmf_lookup_transport( 611 struct nvmf_ctrl_options *opts) 612 { 613 struct nvmf_transport_ops *ops; 614 615 lockdep_assert_held(&nvmf_transports_rwsem); 616 617 list_for_each_entry(ops, &nvmf_transports, entry) { 618 if (strcmp(ops->name, opts->transport) == 0) 619 return ops; 620 } 621 622 return NULL; 623 } 624 625 static const match_table_t opt_tokens = { 626 { NVMF_OPT_TRANSPORT, "transport=%s" }, 627 { NVMF_OPT_TRADDR, "traddr=%s" }, 628 { NVMF_OPT_TRSVCID, "trsvcid=%s" }, 629 { NVMF_OPT_NQN, "nqn=%s" }, 630 { NVMF_OPT_QUEUE_SIZE, "queue_size=%d" }, 631 { NVMF_OPT_NR_IO_QUEUES, "nr_io_queues=%d" }, 632 { NVMF_OPT_RECONNECT_DELAY, "reconnect_delay=%d" }, 633 { NVMF_OPT_CTRL_LOSS_TMO, "ctrl_loss_tmo=%d" }, 634 { NVMF_OPT_KATO, "keep_alive_tmo=%d" }, 635 { NVMF_OPT_HOSTNQN, "hostnqn=%s" }, 636 { NVMF_OPT_HOST_TRADDR, "host_traddr=%s" }, 637 { NVMF_OPT_HOST_IFACE, "host_iface=%s" }, 638 { NVMF_OPT_HOST_ID, "hostid=%s" }, 639 { NVMF_OPT_DUP_CONNECT, "duplicate_connect" }, 640 { NVMF_OPT_DISABLE_SQFLOW, "disable_sqflow" }, 641 { NVMF_OPT_HDR_DIGEST, "hdr_digest" }, 642 { NVMF_OPT_DATA_DIGEST, "data_digest" }, 643 { NVMF_OPT_NR_WRITE_QUEUES, "nr_write_queues=%d" }, 644 { NVMF_OPT_NR_POLL_QUEUES, "nr_poll_queues=%d" }, 645 { NVMF_OPT_TOS, "tos=%d" }, 646 { NVMF_OPT_FAIL_FAST_TMO, "fast_io_fail_tmo=%d" }, 647 { NVMF_OPT_DISCOVERY, "discovery" }, 648 { NVMF_OPT_DHCHAP_SECRET, "dhchap_secret=%s" }, 649 { NVMF_OPT_DHCHAP_CTRL_SECRET, "dhchap_ctrl_secret=%s" }, 650 { NVMF_OPT_ERR, NULL } 651 }; 652 653 static int nvmf_parse_options(struct nvmf_ctrl_options *opts, 654 const char *buf) 655 { 656 substring_t args[MAX_OPT_ARGS]; 657 char *options, *o, *p; 658 int token, ret = 0; 659 size_t nqnlen = 0; 660 int ctrl_loss_tmo = NVMF_DEF_CTRL_LOSS_TMO; 661 uuid_t hostid; 662 char hostnqn[NVMF_NQN_SIZE]; 663 664 /* Set defaults */ 665 opts->queue_size = NVMF_DEF_QUEUE_SIZE; 666 opts->nr_io_queues = num_online_cpus(); 667 opts->reconnect_delay = NVMF_DEF_RECONNECT_DELAY; 668 opts->kato = 0; 669 opts->duplicate_connect = false; 670 opts->fast_io_fail_tmo = NVMF_DEF_FAIL_FAST_TMO; 671 opts->hdr_digest = false; 672 opts->data_digest = false; 673 opts->tos = -1; /* < 0 == use transport default */ 674 675 options = o = kstrdup(buf, GFP_KERNEL); 676 if (!options) 677 return -ENOMEM; 678 679 /* use default host if not given by user space */ 680 uuid_copy(&hostid, &nvmf_default_host->id); 681 strscpy(hostnqn, nvmf_default_host->nqn, NVMF_NQN_SIZE); 682 683 while ((p = strsep(&o, ",\n")) != NULL) { 684 if (!*p) 685 continue; 686 687 token = match_token(p, opt_tokens, args); 688 opts->mask |= token; 689 switch (token) { 690 case NVMF_OPT_TRANSPORT: 691 p = match_strdup(args); 692 if (!p) { 693 ret = -ENOMEM; 694 goto out; 695 } 696 kfree(opts->transport); 697 opts->transport = p; 698 break; 699 case NVMF_OPT_NQN: 700 p = match_strdup(args); 701 if (!p) { 702 ret = -ENOMEM; 703 goto out; 704 } 705 kfree(opts->subsysnqn); 706 opts->subsysnqn = p; 707 nqnlen = strlen(opts->subsysnqn); 708 if (nqnlen >= NVMF_NQN_SIZE) { 709 pr_err("%s needs to be < %d bytes\n", 710 opts->subsysnqn, NVMF_NQN_SIZE); 711 ret = -EINVAL; 712 goto out; 713 } 714 opts->discovery_nqn = 715 !(strcmp(opts->subsysnqn, 716 NVME_DISC_SUBSYS_NAME)); 717 break; 718 case NVMF_OPT_TRADDR: 719 p = match_strdup(args); 720 if (!p) { 721 ret = -ENOMEM; 722 goto out; 723 } 724 kfree(opts->traddr); 725 opts->traddr = p; 726 break; 727 case NVMF_OPT_TRSVCID: 728 p = match_strdup(args); 729 if (!p) { 730 ret = -ENOMEM; 731 goto out; 732 } 733 kfree(opts->trsvcid); 734 opts->trsvcid = p; 735 break; 736 case NVMF_OPT_QUEUE_SIZE: 737 if (match_int(args, &token)) { 738 ret = -EINVAL; 739 goto out; 740 } 741 if (token < NVMF_MIN_QUEUE_SIZE || 742 token > NVMF_MAX_QUEUE_SIZE) { 743 pr_err("Invalid queue_size %d\n", token); 744 ret = -EINVAL; 745 goto out; 746 } 747 opts->queue_size = token; 748 break; 749 case NVMF_OPT_NR_IO_QUEUES: 750 if (match_int(args, &token)) { 751 ret = -EINVAL; 752 goto out; 753 } 754 if (token <= 0) { 755 pr_err("Invalid number of IOQs %d\n", token); 756 ret = -EINVAL; 757 goto out; 758 } 759 if (opts->discovery_nqn) { 760 pr_debug("Ignoring nr_io_queues value for discovery controller\n"); 761 break; 762 } 763 764 opts->nr_io_queues = min_t(unsigned int, 765 num_online_cpus(), token); 766 break; 767 case NVMF_OPT_KATO: 768 if (match_int(args, &token)) { 769 ret = -EINVAL; 770 goto out; 771 } 772 773 if (token < 0) { 774 pr_err("Invalid keep_alive_tmo %d\n", token); 775 ret = -EINVAL; 776 goto out; 777 } else if (token == 0 && !opts->discovery_nqn) { 778 /* Allowed for debug */ 779 pr_warn("keep_alive_tmo 0 won't execute keep alives!!!\n"); 780 } 781 opts->kato = token; 782 break; 783 case NVMF_OPT_CTRL_LOSS_TMO: 784 if (match_int(args, &token)) { 785 ret = -EINVAL; 786 goto out; 787 } 788 789 if (token < 0) 790 pr_warn("ctrl_loss_tmo < 0 will reconnect forever\n"); 791 ctrl_loss_tmo = token; 792 break; 793 case NVMF_OPT_FAIL_FAST_TMO: 794 if (match_int(args, &token)) { 795 ret = -EINVAL; 796 goto out; 797 } 798 799 if (token >= 0) 800 pr_warn("I/O fail on reconnect controller after %d sec\n", 801 token); 802 else 803 token = -1; 804 805 opts->fast_io_fail_tmo = token; 806 break; 807 case NVMF_OPT_HOSTNQN: 808 if (opts->host) { 809 pr_err("hostnqn already user-assigned: %s\n", 810 opts->host->nqn); 811 ret = -EADDRINUSE; 812 goto out; 813 } 814 p = match_strdup(args); 815 if (!p) { 816 ret = -ENOMEM; 817 goto out; 818 } 819 nqnlen = strlen(p); 820 if (nqnlen >= NVMF_NQN_SIZE) { 821 pr_err("%s needs to be < %d bytes\n", 822 p, NVMF_NQN_SIZE); 823 kfree(p); 824 ret = -EINVAL; 825 goto out; 826 } 827 strscpy(hostnqn, p, NVMF_NQN_SIZE); 828 kfree(p); 829 break; 830 case NVMF_OPT_RECONNECT_DELAY: 831 if (match_int(args, &token)) { 832 ret = -EINVAL; 833 goto out; 834 } 835 if (token <= 0) { 836 pr_err("Invalid reconnect_delay %d\n", token); 837 ret = -EINVAL; 838 goto out; 839 } 840 opts->reconnect_delay = token; 841 break; 842 case NVMF_OPT_HOST_TRADDR: 843 p = match_strdup(args); 844 if (!p) { 845 ret = -ENOMEM; 846 goto out; 847 } 848 kfree(opts->host_traddr); 849 opts->host_traddr = p; 850 break; 851 case NVMF_OPT_HOST_IFACE: 852 p = match_strdup(args); 853 if (!p) { 854 ret = -ENOMEM; 855 goto out; 856 } 857 kfree(opts->host_iface); 858 opts->host_iface = p; 859 break; 860 case NVMF_OPT_HOST_ID: 861 p = match_strdup(args); 862 if (!p) { 863 ret = -ENOMEM; 864 goto out; 865 } 866 ret = uuid_parse(p, &hostid); 867 if (ret) { 868 pr_err("Invalid hostid %s\n", p); 869 ret = -EINVAL; 870 kfree(p); 871 goto out; 872 } 873 kfree(p); 874 break; 875 case NVMF_OPT_DUP_CONNECT: 876 opts->duplicate_connect = true; 877 break; 878 case NVMF_OPT_DISABLE_SQFLOW: 879 opts->disable_sqflow = true; 880 break; 881 case NVMF_OPT_HDR_DIGEST: 882 opts->hdr_digest = true; 883 break; 884 case NVMF_OPT_DATA_DIGEST: 885 opts->data_digest = true; 886 break; 887 case NVMF_OPT_NR_WRITE_QUEUES: 888 if (match_int(args, &token)) { 889 ret = -EINVAL; 890 goto out; 891 } 892 if (token <= 0) { 893 pr_err("Invalid nr_write_queues %d\n", token); 894 ret = -EINVAL; 895 goto out; 896 } 897 opts->nr_write_queues = token; 898 break; 899 case NVMF_OPT_NR_POLL_QUEUES: 900 if (match_int(args, &token)) { 901 ret = -EINVAL; 902 goto out; 903 } 904 if (token <= 0) { 905 pr_err("Invalid nr_poll_queues %d\n", token); 906 ret = -EINVAL; 907 goto out; 908 } 909 opts->nr_poll_queues = token; 910 break; 911 case NVMF_OPT_TOS: 912 if (match_int(args, &token)) { 913 ret = -EINVAL; 914 goto out; 915 } 916 if (token < 0) { 917 pr_err("Invalid type of service %d\n", token); 918 ret = -EINVAL; 919 goto out; 920 } 921 if (token > 255) { 922 pr_warn("Clamping type of service to 255\n"); 923 token = 255; 924 } 925 opts->tos = token; 926 break; 927 case NVMF_OPT_DISCOVERY: 928 opts->discovery_nqn = true; 929 break; 930 case NVMF_OPT_DHCHAP_SECRET: 931 p = match_strdup(args); 932 if (!p) { 933 ret = -ENOMEM; 934 goto out; 935 } 936 if (strlen(p) < 11 || strncmp(p, "DHHC-1:", 7)) { 937 pr_err("Invalid DH-CHAP secret %s\n", p); 938 ret = -EINVAL; 939 goto out; 940 } 941 kfree(opts->dhchap_secret); 942 opts->dhchap_secret = p; 943 break; 944 case NVMF_OPT_DHCHAP_CTRL_SECRET: 945 p = match_strdup(args); 946 if (!p) { 947 ret = -ENOMEM; 948 goto out; 949 } 950 if (strlen(p) < 11 || strncmp(p, "DHHC-1:", 7)) { 951 pr_err("Invalid DH-CHAP secret %s\n", p); 952 ret = -EINVAL; 953 goto out; 954 } 955 kfree(opts->dhchap_ctrl_secret); 956 opts->dhchap_ctrl_secret = p; 957 break; 958 default: 959 pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n", 960 p); 961 ret = -EINVAL; 962 goto out; 963 } 964 } 965 966 if (opts->discovery_nqn) { 967 opts->nr_io_queues = 0; 968 opts->nr_write_queues = 0; 969 opts->nr_poll_queues = 0; 970 opts->duplicate_connect = true; 971 } else { 972 if (!opts->kato) 973 opts->kato = NVME_DEFAULT_KATO; 974 } 975 if (ctrl_loss_tmo < 0) { 976 opts->max_reconnects = -1; 977 } else { 978 opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo, 979 opts->reconnect_delay); 980 if (ctrl_loss_tmo < opts->fast_io_fail_tmo) 981 pr_warn("failfast tmo (%d) larger than controller loss tmo (%d)\n", 982 opts->fast_io_fail_tmo, ctrl_loss_tmo); 983 } 984 985 opts->host = nvmf_host_add(hostnqn, &hostid); 986 if (IS_ERR(opts->host)) { 987 ret = PTR_ERR(opts->host); 988 opts->host = NULL; 989 goto out; 990 } 991 992 out: 993 kfree(options); 994 return ret; 995 } 996 997 void nvmf_set_io_queues(struct nvmf_ctrl_options *opts, u32 nr_io_queues, 998 u32 io_queues[HCTX_MAX_TYPES]) 999 { 1000 if (opts->nr_write_queues && opts->nr_io_queues < nr_io_queues) { 1001 /* 1002 * separate read/write queues 1003 * hand out dedicated default queues only after we have 1004 * sufficient read queues. 1005 */ 1006 io_queues[HCTX_TYPE_READ] = opts->nr_io_queues; 1007 nr_io_queues -= io_queues[HCTX_TYPE_READ]; 1008 io_queues[HCTX_TYPE_DEFAULT] = 1009 min(opts->nr_write_queues, nr_io_queues); 1010 nr_io_queues -= io_queues[HCTX_TYPE_DEFAULT]; 1011 } else { 1012 /* 1013 * shared read/write queues 1014 * either no write queues were requested, or we don't have 1015 * sufficient queue count to have dedicated default queues. 1016 */ 1017 io_queues[HCTX_TYPE_DEFAULT] = 1018 min(opts->nr_io_queues, nr_io_queues); 1019 nr_io_queues -= io_queues[HCTX_TYPE_DEFAULT]; 1020 } 1021 1022 if (opts->nr_poll_queues && nr_io_queues) { 1023 /* map dedicated poll queues only if we have queues left */ 1024 io_queues[HCTX_TYPE_POLL] = 1025 min(opts->nr_poll_queues, nr_io_queues); 1026 } 1027 } 1028 EXPORT_SYMBOL_GPL(nvmf_set_io_queues); 1029 1030 void nvmf_map_queues(struct blk_mq_tag_set *set, struct nvme_ctrl *ctrl, 1031 u32 io_queues[HCTX_MAX_TYPES]) 1032 { 1033 struct nvmf_ctrl_options *opts = ctrl->opts; 1034 1035 if (opts->nr_write_queues && io_queues[HCTX_TYPE_READ]) { 1036 /* separate read/write queues */ 1037 set->map[HCTX_TYPE_DEFAULT].nr_queues = 1038 io_queues[HCTX_TYPE_DEFAULT]; 1039 set->map[HCTX_TYPE_DEFAULT].queue_offset = 0; 1040 set->map[HCTX_TYPE_READ].nr_queues = 1041 io_queues[HCTX_TYPE_READ]; 1042 set->map[HCTX_TYPE_READ].queue_offset = 1043 io_queues[HCTX_TYPE_DEFAULT]; 1044 } else { 1045 /* shared read/write queues */ 1046 set->map[HCTX_TYPE_DEFAULT].nr_queues = 1047 io_queues[HCTX_TYPE_DEFAULT]; 1048 set->map[HCTX_TYPE_DEFAULT].queue_offset = 0; 1049 set->map[HCTX_TYPE_READ].nr_queues = 1050 io_queues[HCTX_TYPE_DEFAULT]; 1051 set->map[HCTX_TYPE_READ].queue_offset = 0; 1052 } 1053 1054 blk_mq_map_queues(&set->map[HCTX_TYPE_DEFAULT]); 1055 blk_mq_map_queues(&set->map[HCTX_TYPE_READ]); 1056 if (opts->nr_poll_queues && io_queues[HCTX_TYPE_POLL]) { 1057 /* map dedicated poll queues only if we have queues left */ 1058 set->map[HCTX_TYPE_POLL].nr_queues = io_queues[HCTX_TYPE_POLL]; 1059 set->map[HCTX_TYPE_POLL].queue_offset = 1060 io_queues[HCTX_TYPE_DEFAULT] + 1061 io_queues[HCTX_TYPE_READ]; 1062 blk_mq_map_queues(&set->map[HCTX_TYPE_POLL]); 1063 } 1064 1065 dev_info(ctrl->device, 1066 "mapped %d/%d/%d default/read/poll queues.\n", 1067 io_queues[HCTX_TYPE_DEFAULT], 1068 io_queues[HCTX_TYPE_READ], 1069 io_queues[HCTX_TYPE_POLL]); 1070 } 1071 EXPORT_SYMBOL_GPL(nvmf_map_queues); 1072 1073 static int nvmf_check_required_opts(struct nvmf_ctrl_options *opts, 1074 unsigned int required_opts) 1075 { 1076 if ((opts->mask & required_opts) != required_opts) { 1077 unsigned int i; 1078 1079 for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) { 1080 if ((opt_tokens[i].token & required_opts) && 1081 !(opt_tokens[i].token & opts->mask)) { 1082 pr_warn("missing parameter '%s'\n", 1083 opt_tokens[i].pattern); 1084 } 1085 } 1086 1087 return -EINVAL; 1088 } 1089 1090 return 0; 1091 } 1092 1093 bool nvmf_ip_options_match(struct nvme_ctrl *ctrl, 1094 struct nvmf_ctrl_options *opts) 1095 { 1096 if (!nvmf_ctlr_matches_baseopts(ctrl, opts) || 1097 strcmp(opts->traddr, ctrl->opts->traddr) || 1098 strcmp(opts->trsvcid, ctrl->opts->trsvcid)) 1099 return false; 1100 1101 /* 1102 * Checking the local address or host interfaces is rough. 1103 * 1104 * In most cases, none is specified and the host port or 1105 * host interface is selected by the stack. 1106 * 1107 * Assume no match if: 1108 * - local address or host interface is specified and address 1109 * or host interface is not the same 1110 * - local address or host interface is not specified but 1111 * remote is, or vice versa (admin using specific 1112 * host_traddr/host_iface when it matters). 1113 */ 1114 if ((opts->mask & NVMF_OPT_HOST_TRADDR) && 1115 (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)) { 1116 if (strcmp(opts->host_traddr, ctrl->opts->host_traddr)) 1117 return false; 1118 } else if ((opts->mask & NVMF_OPT_HOST_TRADDR) || 1119 (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)) { 1120 return false; 1121 } 1122 1123 if ((opts->mask & NVMF_OPT_HOST_IFACE) && 1124 (ctrl->opts->mask & NVMF_OPT_HOST_IFACE)) { 1125 if (strcmp(opts->host_iface, ctrl->opts->host_iface)) 1126 return false; 1127 } else if ((opts->mask & NVMF_OPT_HOST_IFACE) || 1128 (ctrl->opts->mask & NVMF_OPT_HOST_IFACE)) { 1129 return false; 1130 } 1131 1132 return true; 1133 } 1134 EXPORT_SYMBOL_GPL(nvmf_ip_options_match); 1135 1136 static int nvmf_check_allowed_opts(struct nvmf_ctrl_options *opts, 1137 unsigned int allowed_opts) 1138 { 1139 if (opts->mask & ~allowed_opts) { 1140 unsigned int i; 1141 1142 for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) { 1143 if ((opt_tokens[i].token & opts->mask) && 1144 (opt_tokens[i].token & ~allowed_opts)) { 1145 pr_warn("invalid parameter '%s'\n", 1146 opt_tokens[i].pattern); 1147 } 1148 } 1149 1150 return -EINVAL; 1151 } 1152 1153 return 0; 1154 } 1155 1156 void nvmf_free_options(struct nvmf_ctrl_options *opts) 1157 { 1158 nvmf_host_put(opts->host); 1159 kfree(opts->transport); 1160 kfree(opts->traddr); 1161 kfree(opts->trsvcid); 1162 kfree(opts->subsysnqn); 1163 kfree(opts->host_traddr); 1164 kfree(opts->host_iface); 1165 kfree(opts->dhchap_secret); 1166 kfree(opts->dhchap_ctrl_secret); 1167 kfree(opts); 1168 } 1169 EXPORT_SYMBOL_GPL(nvmf_free_options); 1170 1171 #define NVMF_REQUIRED_OPTS (NVMF_OPT_TRANSPORT | NVMF_OPT_NQN) 1172 #define NVMF_ALLOWED_OPTS (NVMF_OPT_QUEUE_SIZE | NVMF_OPT_NR_IO_QUEUES | \ 1173 NVMF_OPT_KATO | NVMF_OPT_HOSTNQN | \ 1174 NVMF_OPT_HOST_ID | NVMF_OPT_DUP_CONNECT |\ 1175 NVMF_OPT_DISABLE_SQFLOW | NVMF_OPT_DISCOVERY |\ 1176 NVMF_OPT_FAIL_FAST_TMO | NVMF_OPT_DHCHAP_SECRET |\ 1177 NVMF_OPT_DHCHAP_CTRL_SECRET) 1178 1179 static struct nvme_ctrl * 1180 nvmf_create_ctrl(struct device *dev, const char *buf) 1181 { 1182 struct nvmf_ctrl_options *opts; 1183 struct nvmf_transport_ops *ops; 1184 struct nvme_ctrl *ctrl; 1185 int ret; 1186 1187 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 1188 if (!opts) 1189 return ERR_PTR(-ENOMEM); 1190 1191 ret = nvmf_parse_options(opts, buf); 1192 if (ret) 1193 goto out_free_opts; 1194 1195 1196 request_module("nvme-%s", opts->transport); 1197 1198 /* 1199 * Check the generic options first as we need a valid transport for 1200 * the lookup below. Then clear the generic flags so that transport 1201 * drivers don't have to care about them. 1202 */ 1203 ret = nvmf_check_required_opts(opts, NVMF_REQUIRED_OPTS); 1204 if (ret) 1205 goto out_free_opts; 1206 opts->mask &= ~NVMF_REQUIRED_OPTS; 1207 1208 down_read(&nvmf_transports_rwsem); 1209 ops = nvmf_lookup_transport(opts); 1210 if (!ops) { 1211 pr_info("no handler found for transport %s.\n", 1212 opts->transport); 1213 ret = -EINVAL; 1214 goto out_unlock; 1215 } 1216 1217 if (!try_module_get(ops->module)) { 1218 ret = -EBUSY; 1219 goto out_unlock; 1220 } 1221 up_read(&nvmf_transports_rwsem); 1222 1223 ret = nvmf_check_required_opts(opts, ops->required_opts); 1224 if (ret) 1225 goto out_module_put; 1226 ret = nvmf_check_allowed_opts(opts, NVMF_ALLOWED_OPTS | 1227 ops->allowed_opts | ops->required_opts); 1228 if (ret) 1229 goto out_module_put; 1230 1231 ctrl = ops->create_ctrl(dev, opts); 1232 if (IS_ERR(ctrl)) { 1233 ret = PTR_ERR(ctrl); 1234 goto out_module_put; 1235 } 1236 1237 module_put(ops->module); 1238 return ctrl; 1239 1240 out_module_put: 1241 module_put(ops->module); 1242 goto out_free_opts; 1243 out_unlock: 1244 up_read(&nvmf_transports_rwsem); 1245 out_free_opts: 1246 nvmf_free_options(opts); 1247 return ERR_PTR(ret); 1248 } 1249 1250 static struct class *nvmf_class; 1251 static struct device *nvmf_device; 1252 static DEFINE_MUTEX(nvmf_dev_mutex); 1253 1254 static ssize_t nvmf_dev_write(struct file *file, const char __user *ubuf, 1255 size_t count, loff_t *pos) 1256 { 1257 struct seq_file *seq_file = file->private_data; 1258 struct nvme_ctrl *ctrl; 1259 const char *buf; 1260 int ret = 0; 1261 1262 if (count > PAGE_SIZE) 1263 return -ENOMEM; 1264 1265 buf = memdup_user_nul(ubuf, count); 1266 if (IS_ERR(buf)) 1267 return PTR_ERR(buf); 1268 1269 mutex_lock(&nvmf_dev_mutex); 1270 if (seq_file->private) { 1271 ret = -EINVAL; 1272 goto out_unlock; 1273 } 1274 1275 ctrl = nvmf_create_ctrl(nvmf_device, buf); 1276 if (IS_ERR(ctrl)) { 1277 ret = PTR_ERR(ctrl); 1278 goto out_unlock; 1279 } 1280 1281 seq_file->private = ctrl; 1282 1283 out_unlock: 1284 mutex_unlock(&nvmf_dev_mutex); 1285 kfree(buf); 1286 return ret ? ret : count; 1287 } 1288 1289 static void __nvmf_concat_opt_tokens(struct seq_file *seq_file) 1290 { 1291 const struct match_token *tok; 1292 int idx; 1293 1294 /* 1295 * Add dummy entries for instance and cntlid to 1296 * signal an invalid/non-existing controller 1297 */ 1298 seq_puts(seq_file, "instance=-1,cntlid=-1"); 1299 for (idx = 0; idx < ARRAY_SIZE(opt_tokens); idx++) { 1300 tok = &opt_tokens[idx]; 1301 if (tok->token == NVMF_OPT_ERR) 1302 continue; 1303 seq_puts(seq_file, ","); 1304 seq_puts(seq_file, tok->pattern); 1305 } 1306 seq_puts(seq_file, "\n"); 1307 } 1308 1309 static int nvmf_dev_show(struct seq_file *seq_file, void *private) 1310 { 1311 struct nvme_ctrl *ctrl; 1312 1313 mutex_lock(&nvmf_dev_mutex); 1314 ctrl = seq_file->private; 1315 if (!ctrl) { 1316 __nvmf_concat_opt_tokens(seq_file); 1317 goto out_unlock; 1318 } 1319 1320 seq_printf(seq_file, "instance=%d,cntlid=%d\n", 1321 ctrl->instance, ctrl->cntlid); 1322 1323 out_unlock: 1324 mutex_unlock(&nvmf_dev_mutex); 1325 return 0; 1326 } 1327 1328 static int nvmf_dev_open(struct inode *inode, struct file *file) 1329 { 1330 /* 1331 * The miscdevice code initializes file->private_data, but doesn't 1332 * make use of it later. 1333 */ 1334 file->private_data = NULL; 1335 return single_open(file, nvmf_dev_show, NULL); 1336 } 1337 1338 static int nvmf_dev_release(struct inode *inode, struct file *file) 1339 { 1340 struct seq_file *seq_file = file->private_data; 1341 struct nvme_ctrl *ctrl = seq_file->private; 1342 1343 if (ctrl) 1344 nvme_put_ctrl(ctrl); 1345 return single_release(inode, file); 1346 } 1347 1348 static const struct file_operations nvmf_dev_fops = { 1349 .owner = THIS_MODULE, 1350 .write = nvmf_dev_write, 1351 .read = seq_read, 1352 .open = nvmf_dev_open, 1353 .release = nvmf_dev_release, 1354 }; 1355 1356 static struct miscdevice nvmf_misc = { 1357 .minor = MISC_DYNAMIC_MINOR, 1358 .name = "nvme-fabrics", 1359 .fops = &nvmf_dev_fops, 1360 }; 1361 1362 static int __init nvmf_init(void) 1363 { 1364 int ret; 1365 1366 nvmf_default_host = nvmf_host_default(); 1367 if (!nvmf_default_host) 1368 return -ENOMEM; 1369 1370 nvmf_class = class_create("nvme-fabrics"); 1371 if (IS_ERR(nvmf_class)) { 1372 pr_err("couldn't register class nvme-fabrics\n"); 1373 ret = PTR_ERR(nvmf_class); 1374 goto out_free_host; 1375 } 1376 1377 nvmf_device = 1378 device_create(nvmf_class, NULL, MKDEV(0, 0), NULL, "ctl"); 1379 if (IS_ERR(nvmf_device)) { 1380 pr_err("couldn't create nvme-fabrics device!\n"); 1381 ret = PTR_ERR(nvmf_device); 1382 goto out_destroy_class; 1383 } 1384 1385 ret = misc_register(&nvmf_misc); 1386 if (ret) { 1387 pr_err("couldn't register misc device: %d\n", ret); 1388 goto out_destroy_device; 1389 } 1390 1391 return 0; 1392 1393 out_destroy_device: 1394 device_destroy(nvmf_class, MKDEV(0, 0)); 1395 out_destroy_class: 1396 class_destroy(nvmf_class); 1397 out_free_host: 1398 nvmf_host_put(nvmf_default_host); 1399 return ret; 1400 } 1401 1402 static void __exit nvmf_exit(void) 1403 { 1404 misc_deregister(&nvmf_misc); 1405 device_destroy(nvmf_class, MKDEV(0, 0)); 1406 class_destroy(nvmf_class); 1407 nvmf_host_put(nvmf_default_host); 1408 1409 BUILD_BUG_ON(sizeof(struct nvmf_common_command) != 64); 1410 BUILD_BUG_ON(sizeof(struct nvmf_connect_command) != 64); 1411 BUILD_BUG_ON(sizeof(struct nvmf_property_get_command) != 64); 1412 BUILD_BUG_ON(sizeof(struct nvmf_property_set_command) != 64); 1413 BUILD_BUG_ON(sizeof(struct nvmf_auth_send_command) != 64); 1414 BUILD_BUG_ON(sizeof(struct nvmf_auth_receive_command) != 64); 1415 BUILD_BUG_ON(sizeof(struct nvmf_connect_data) != 1024); 1416 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_negotiate_data) != 8); 1417 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_challenge_data) != 16); 1418 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_reply_data) != 16); 1419 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_success1_data) != 16); 1420 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_success2_data) != 16); 1421 } 1422 1423 MODULE_LICENSE("GPL v2"); 1424 1425 module_init(nvmf_init); 1426 module_exit(nvmf_exit); 1427