drivers/nvme/host/fabrics.c

   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_find(const char *hostnqn)
  25 {
  26         struct nvmf_host *host;
  27
  28         list_for_each_entry(host, &nvmf_hosts, list) {
  29                 if (!strcmp(host->nqn, hostnqn))
  30                         return host;
  31         }
  32
  33         return NULL;
  34 }
  35
  36 static struct nvmf_host *nvmf_host_add(const char *hostnqn)
  37 {
  38         struct nvmf_host *host;
  39
  40         mutex_lock(&nvmf_hosts_mutex);
  41         host = __nvmf_host_find(hostnqn);
  42         if (host) {
  43                 kref_get(&host->ref);
  44                 goto out_unlock;
  45         }
  46
  47         host = kmalloc(sizeof(*host), GFP_KERNEL);
  48         if (!host)
  49                 goto out_unlock;
  50
  51         kref_init(&host->ref);
  52         strlcpy(host->nqn, hostnqn, NVMF_NQN_SIZE);
  53
  54         list_add_tail(&host->list, &nvmf_hosts);
  55 out_unlock:
  56         mutex_unlock(&nvmf_hosts_mutex);
  57         return host;
  58 }
  59
  60 static struct nvmf_host *nvmf_host_default(void)
  61 {
  62         struct nvmf_host *host;
  63
  64         host = kmalloc(sizeof(*host), GFP_KERNEL);
  65         if (!host)
  66                 return NULL;
  67
  68         kref_init(&host->ref);
  69         uuid_gen(&host->id);
  70         snprintf(host->nqn, NVMF_NQN_SIZE,
  71                 "nqn.2014-08.org.nvmexpress:uuid:%pUb", &host->id);
  72
  73         mutex_lock(&nvmf_hosts_mutex);
  74         list_add_tail(&host->list, &nvmf_hosts);
  75         mutex_unlock(&nvmf_hosts_mutex);
  76
  77         return host;
  78 }
  79
  80 static void nvmf_host_destroy(struct kref *ref)
  81 {
  82         struct nvmf_host *host = container_of(ref, struct nvmf_host, ref);
  83
  84         mutex_lock(&nvmf_hosts_mutex);
  85         list_del(&host->list);
  86         mutex_unlock(&nvmf_hosts_mutex);
  87
  88         kfree(host);
  89 }
  90
  91 static void nvmf_host_put(struct nvmf_host *host)
  92 {
  93         if (host)
  94                 kref_put(&host->ref, nvmf_host_destroy);
  95 }
  96
  97 /**
  98  * nvmf_get_address() -  Get address/port
  99  * @ctrl:       Host NVMe controller instance which we got the address
 100  * @buf:        OUTPUT parameter that will contain the address/port
 101  * @size:       buffer size
 102  */
 103 int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size)
 104 {
 105         int len = 0;
 106
 107         if (ctrl->opts->mask & NVMF_OPT_TRADDR)
 108                 len += scnprintf(buf, size, "traddr=%s", ctrl->opts->traddr);
 109         if (ctrl->opts->mask & NVMF_OPT_TRSVCID)
 110                 len += scnprintf(buf + len, size - len, "%strsvcid=%s",
 111                                 (len) ? "," : "", ctrl->opts->trsvcid);
 112         if (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)
 113                 len += scnprintf(buf + len, size - len, "%shost_traddr=%s",
 114                                 (len) ? "," : "", ctrl->opts->host_traddr);
 115         if (ctrl->opts->mask & NVMF_OPT_HOST_IFACE)
 116                 len += scnprintf(buf + len, size - len, "%shost_iface=%s",
 117                                 (len) ? "," : "", ctrl->opts->host_iface);
 118         len += scnprintf(buf + len, size - len, "\n");
 119
 120         return len;
 121 }
 122 EXPORT_SYMBOL_GPL(nvmf_get_address);
 123
 124 /**
 125  * nvmf_reg_read32() -  NVMe Fabrics "Property Get" API function.
 126  * @ctrl:       Host NVMe controller instance maintaining the admin
 127  *              queue used to submit the property read command to
 128  *              the allocated NVMe controller resource on the target system.
 129  * @off:        Starting offset value of the targeted property
 130  *              register (see the fabrics section of the NVMe standard).
 131  * @val:        OUTPUT parameter that will contain the value of
 132  *              the property after a successful read.
 133  *
 134  * Used by the host system to retrieve a 32-bit capsule property value
 135  * from an NVMe controller on the target system.
 136  *
 137  * ("Capsule property" is an "PCIe register concept" applied to the
 138  * NVMe fabrics space.)
 139  *
 140  * Return:
 141  *      0: successful read
 142  *      > 0: NVMe error status code
 143  *      < 0: Linux errno error code
 144  */
 145 int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
 146 {
 147         struct nvme_command cmd = { };
 148         union nvme_result res;
 149         int ret;
 150
 151         cmd.prop_get.opcode = nvme_fabrics_command;
 152         cmd.prop_get.fctype = nvme_fabrics_type_property_get;
 153         cmd.prop_get.offset = cpu_to_le32(off);
 154
 155         ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res, NULL, 0,
 156                         NVME_QID_ANY, 0, 0);
 157
 158         if (ret >= 0)
 159                 *val = le64_to_cpu(res.u64);
 160         if (unlikely(ret != 0))
 161                 dev_err(ctrl->device,
 162                         "Property Get error: %d, offset %#x\n",
 163                         ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
 164
 165         return ret;
 166 }
 167 EXPORT_SYMBOL_GPL(nvmf_reg_read32);
 168
 169 /**
 170  * nvmf_reg_read64() -  NVMe Fabrics "Property Get" API function.
 171  * @ctrl:       Host NVMe controller instance maintaining the admin
 172  *              queue used to submit the property read command to
 173  *              the allocated controller resource on the target system.
 174  * @off:        Starting offset value of the targeted property
 175  *              register (see the fabrics section of the NVMe standard).
 176  * @val:        OUTPUT parameter that will contain the value of
 177  *              the property after a successful read.
 178  *
 179  * Used by the host system to retrieve a 64-bit capsule property value
 180  * from an NVMe controller on the target system.
 181  *
 182  * ("Capsule property" is an "PCIe register concept" applied to the
 183  * NVMe fabrics space.)
 184  *
 185  * Return:
 186  *      0: successful read
 187  *      > 0: NVMe error status code
 188  *      < 0: Linux errno error code
 189  */
 190 int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
 191 {
 192         struct nvme_command cmd = { };
 193         union nvme_result res;
 194         int ret;
 195
 196         cmd.prop_get.opcode = nvme_fabrics_command;
 197         cmd.prop_get.fctype = nvme_fabrics_type_property_get;
 198         cmd.prop_get.attrib = 1;
 199         cmd.prop_get.offset = cpu_to_le32(off);
 200
 201         ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res, NULL, 0,
 202                         NVME_QID_ANY, 0, 0);
 203
 204         if (ret >= 0)
 205                 *val = le64_to_cpu(res.u64);
 206         if (unlikely(ret != 0))
 207                 dev_err(ctrl->device,
 208                         "Property Get error: %d, offset %#x\n",
 209                         ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
 210         return ret;
 211 }
 212 EXPORT_SYMBOL_GPL(nvmf_reg_read64);
 213
 214 /**
 215  * nvmf_reg_write32() -  NVMe Fabrics "Property Write" API function.
 216  * @ctrl:       Host NVMe controller instance maintaining the admin
 217  *              queue used to submit the property read command to
 218  *              the allocated NVMe controller resource on the target system.
 219  * @off:        Starting offset value of the targeted property
 220  *              register (see the fabrics section of the NVMe standard).
 221  * @val:        Input parameter that contains the value to be
 222  *              written to the property.
 223  *
 224  * Used by the NVMe host system to write a 32-bit capsule property value
 225  * to an NVMe controller on the target system.
 226  *
 227  * ("Capsule property" is an "PCIe register concept" applied to the
 228  * NVMe fabrics space.)
 229  *
 230  * Return:
 231  *      0: successful write
 232  *      > 0: NVMe error status code
 233  *      < 0: Linux errno error code
 234  */
 235 int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
 236 {
 237         struct nvme_command cmd = { };
 238         int ret;
 239
 240         cmd.prop_set.opcode = nvme_fabrics_command;
 241         cmd.prop_set.fctype = nvme_fabrics_type_property_set;
 242         cmd.prop_set.attrib = 0;
 243         cmd.prop_set.offset = cpu_to_le32(off);
 244         cmd.prop_set.value = cpu_to_le64(val);
 245
 246         ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, NULL, NULL, 0,
 247                         NVME_QID_ANY, 0, 0);
 248         if (unlikely(ret))
 249                 dev_err(ctrl->device,
 250                         "Property Set error: %d, offset %#x\n",
 251                         ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
 252         return ret;
 253 }
 254 EXPORT_SYMBOL_GPL(nvmf_reg_write32);
 255
 256 /**
 257  * nvmf_log_connect_error() - Error-parsing-diagnostic print out function for
 258  *                              connect() errors.
 259  * @ctrl:       The specific /dev/nvmeX device that had the error.
 260  * @errval:     Error code to be decoded in a more human-friendly
 261  *              printout.
 262  * @offset:     For use with the NVMe error code
 263  *              NVME_SC_CONNECT_INVALID_PARAM.
 264  * @cmd:        This is the SQE portion of a submission capsule.
 265  * @data:       This is the "Data" portion of a submission capsule.
 266  */
 267 static void nvmf_log_connect_error(struct nvme_ctrl *ctrl,
 268                 int errval, int offset, struct nvme_command *cmd,
 269                 struct nvmf_connect_data *data)
 270 {
 271         int err_sctype = errval & ~NVME_SC_DNR;
 272
 273         if (errval < 0) {
 274                 dev_err(ctrl->device,
 275                         "Connect command failed, errno: %d\n", errval);
 276                 return;
 277         }
 278
 279         switch (err_sctype) {
 280         case NVME_SC_CONNECT_INVALID_PARAM:
 281                 if (offset >> 16) {
 282                         char *inv_data = "Connect Invalid Data Parameter";
 283
 284                         switch (offset & 0xffff) {
 285                         case (offsetof(struct nvmf_connect_data, cntlid)):
 286                                 dev_err(ctrl->device,
 287                                         "%s, cntlid: %d\n",
 288                                         inv_data, data->cntlid);
 289                                 break;
 290                         case (offsetof(struct nvmf_connect_data, hostnqn)):
 291                                 dev_err(ctrl->device,
 292                                         "%s, hostnqn \"%s\"\n",
 293                                         inv_data, data->hostnqn);
 294                                 break;
 295                         case (offsetof(struct nvmf_connect_data, subsysnqn)):
 296                                 dev_err(ctrl->device,
 297                                         "%s, subsysnqn \"%s\"\n",
 298                                         inv_data, data->subsysnqn);
 299                                 break;
 300                         default:
 301                                 dev_err(ctrl->device,
 302                                         "%s, starting byte offset: %d\n",
 303                                        inv_data, offset & 0xffff);
 304                                 break;
 305                         }
 306                 } else {
 307                         char *inv_sqe = "Connect Invalid SQE Parameter";
 308
 309                         switch (offset) {
 310                         case (offsetof(struct nvmf_connect_command, qid)):
 311                                 dev_err(ctrl->device,
 312                                        "%s, qid %d\n",
 313                                         inv_sqe, cmd->connect.qid);
 314                                 break;
 315                         default:
 316                                 dev_err(ctrl->device,
 317                                         "%s, starting byte offset: %d\n",
 318                                         inv_sqe, offset);
 319                         }
 320                 }
 321                 break;
 322         case NVME_SC_CONNECT_INVALID_HOST:
 323                 dev_err(ctrl->device,
 324                         "Connect for subsystem %s is not allowed, hostnqn: %s\n",
 325                         data->subsysnqn, data->hostnqn);
 326                 break;
 327         case NVME_SC_CONNECT_CTRL_BUSY:
 328                 dev_err(ctrl->device,
 329                         "Connect command failed: controller is busy or not available\n");
 330                 break;
 331         case NVME_SC_CONNECT_FORMAT:
 332                 dev_err(ctrl->device,
 333                         "Connect incompatible format: %d",
 334                         cmd->connect.recfmt);
 335                 break;
 336         case NVME_SC_HOST_PATH_ERROR:
 337                 dev_err(ctrl->device,
 338                         "Connect command failed: host path error\n");
 339                 break;
 340         case NVME_SC_AUTH_REQUIRED:
 341                 dev_err(ctrl->device,
 342                         "Connect command failed: authentication required\n");
 343                 break;
 344         default:
 345                 dev_err(ctrl->device,
 346                         "Connect command failed, error wo/DNR bit: %d\n",
 347                         err_sctype);
 348                 break;
 349         }
 350 }
 351
 352 /**
 353  * nvmf_connect_admin_queue() - NVMe Fabrics Admin Queue "Connect"
 354  *                              API function.
 355  * @ctrl:       Host nvme controller instance used to request
 356  *              a new NVMe controller allocation on the target
 357  *              system and  establish an NVMe Admin connection to
 358  *              that controller.
 359  *
 360  * This function enables an NVMe host device to request a new allocation of
 361  * an NVMe controller resource on a target system as well establish a
 362  * fabrics-protocol connection of the NVMe Admin queue between the
 363  * host system device and the allocated NVMe controller on the
 364  * target system via a NVMe Fabrics "Connect" command.
 365  *
 366  * Return:
 367  *      0: success
 368  *      > 0: NVMe error status code
 369  *      < 0: Linux errno error code
 370  *
 371  */
 372 int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl)
 373 {
 374         struct nvme_command cmd = { };
 375         union nvme_result res;
 376         struct nvmf_connect_data *data;
 377         int ret;
 378         u32 result;
 379
 380         cmd.connect.opcode = nvme_fabrics_command;
 381         cmd.connect.fctype = nvme_fabrics_type_connect;
 382         cmd.connect.qid = 0;
 383         cmd.connect.sqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
 384
 385         /*
 386          * Set keep-alive timeout in seconds granularity (ms * 1000)
 387          */
 388         cmd.connect.kato = cpu_to_le32(ctrl->kato * 1000);
 389
 390         if (ctrl->opts->disable_sqflow)
 391                 cmd.connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW;
 392
 393         data = kzalloc(sizeof(*data), GFP_KERNEL);
 394         if (!data)
 395                 return -ENOMEM;
 396
 397         uuid_copy(&data->hostid, &ctrl->opts->host->id);
 398         data->cntlid = cpu_to_le16(0xffff);
 399         strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE);
 400         strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE);
 401
 402         ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res,
 403                         data, sizeof(*data), NVME_QID_ANY, 1,
 404                         BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
 405         if (ret) {
 406                 nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32),
 407                                        &cmd, data);
 408                 goto out_free_data;
 409         }
 410
 411         result = le32_to_cpu(res.u32);
 412         ctrl->cntlid = result & 0xFFFF;
 413         if ((result >> 16) & 0x3) {
 414                 /* Authentication required */
 415                 ret = nvme_auth_negotiate(ctrl, 0);
 416                 if (ret) {
 417                         dev_warn(ctrl->device,
 418                                  "qid 0: authentication setup failed\n");
 419                         ret = NVME_SC_AUTH_REQUIRED;
 420                         goto out_free_data;
 421                 }
 422                 ret = nvme_auth_wait(ctrl, 0);
 423                 if (ret)
 424                         dev_warn(ctrl->device,
 425                                  "qid 0: authentication failed\n");
 426                 else
 427                         dev_info(ctrl->device,
 428                                  "qid 0: authenticated\n");
 429         }
 430 out_free_data:
 431         kfree(data);
 432         return ret;
 433 }
 434 EXPORT_SYMBOL_GPL(nvmf_connect_admin_queue);
 435
 436 /**
 437  * nvmf_connect_io_queue() - NVMe Fabrics I/O Queue "Connect"
 438  *                           API function.
 439  * @ctrl:       Host nvme controller instance used to establish an
 440  *              NVMe I/O queue connection to the already allocated NVMe
 441  *              controller on the target system.
 442  * @qid:        NVMe I/O queue number for the new I/O connection between
 443  *              host and target (note qid == 0 is illegal as this is
 444  *              the Admin queue, per NVMe standard).
 445  *
 446  * This function issues a fabrics-protocol connection
 447  * of a NVMe I/O queue (via NVMe Fabrics "Connect" command)
 448  * between the host system device and the allocated NVMe controller
 449  * on the target system.
 450  *
 451  * Return:
 452  *      0: success
 453  *      > 0: NVMe error status code
 454  *      < 0: Linux errno error code
 455  */
 456 int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid)
 457 {
 458         struct nvme_command cmd = { };
 459         struct nvmf_connect_data *data;
 460         union nvme_result res;
 461         int ret;
 462         u32 result;
 463
 464         cmd.connect.opcode = nvme_fabrics_command;
 465         cmd.connect.fctype = nvme_fabrics_type_connect;
 466         cmd.connect.qid = cpu_to_le16(qid);
 467         cmd.connect.sqsize = cpu_to_le16(ctrl->sqsize);
 468
 469         if (ctrl->opts->disable_sqflow)
 470                 cmd.connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW;
 471
 472         data = kzalloc(sizeof(*data), GFP_KERNEL);
 473         if (!data)
 474                 return -ENOMEM;
 475
 476         uuid_copy(&data->hostid, &ctrl->opts->host->id);
 477         data->cntlid = cpu_to_le16(ctrl->cntlid);
 478         strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE);
 479         strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE);
 480
 481         ret = __nvme_submit_sync_cmd(ctrl->connect_q, &cmd, &res,
 482                         data, sizeof(*data), qid, 1,
 483                         BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
 484         if (ret) {
 485                 nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32),
 486                                        &cmd, data);
 487         }
 488         result = le32_to_cpu(res.u32);
 489         if ((result >> 16) & 2) {
 490                 /* Authentication required */
 491                 ret = nvme_auth_negotiate(ctrl, qid);
 492                 if (ret) {
 493                         dev_warn(ctrl->device,
 494                                  "qid %d: authentication setup failed\n", qid);
 495                         ret = NVME_SC_AUTH_REQUIRED;
 496                 } else {
 497                         ret = nvme_auth_wait(ctrl, qid);
 498                         if (ret)
 499                                 dev_warn(ctrl->device,
 500                                          "qid %u: authentication failed\n", qid);
 501                 }
 502         }
 503         kfree(data);
 504         return ret;
 505 }
 506 EXPORT_SYMBOL_GPL(nvmf_connect_io_queue);
 507
 508 bool nvmf_should_reconnect(struct nvme_ctrl *ctrl)
 509 {
 510         if (ctrl->opts->max_reconnects == -1 ||
 511             ctrl->nr_reconnects < ctrl->opts->max_reconnects)
 512                 return true;
 513
 514         return false;
 515 }
 516 EXPORT_SYMBOL_GPL(nvmf_should_reconnect);
 517
 518 /**
 519  * nvmf_register_transport() - NVMe Fabrics Library registration function.
 520  * @ops:        Transport ops instance to be registered to the
 521  *              common fabrics library.
 522  *
 523  * API function that registers the type of specific transport fabric
 524  * being implemented to the common NVMe fabrics library. Part of
 525  * the overall init sequence of starting up a fabrics driver.
 526  */
 527 int nvmf_register_transport(struct nvmf_transport_ops *ops)
 528 {
 529         if (!ops->create_ctrl)
 530                 return -EINVAL;
 531
 532         down_write(&nvmf_transports_rwsem);
 533         list_add_tail(&ops->entry, &nvmf_transports);
 534         up_write(&nvmf_transports_rwsem);
 535
 536         return 0;
 537 }
 538 EXPORT_SYMBOL_GPL(nvmf_register_transport);
 539
 540 /**
 541  * nvmf_unregister_transport() - NVMe Fabrics Library unregistration function.
 542  * @ops:        Transport ops instance to be unregistered from the
 543  *              common fabrics library.
 544  *
 545  * Fabrics API function that unregisters the type of specific transport
 546  * fabric being implemented from the common NVMe fabrics library.
 547  * Part of the overall exit sequence of unloading the implemented driver.
 548  */
 549 void nvmf_unregister_transport(struct nvmf_transport_ops *ops)
 550 {
 551         down_write(&nvmf_transports_rwsem);
 552         list_del(&ops->entry);
 553         up_write(&nvmf_transports_rwsem);
 554 }
 555 EXPORT_SYMBOL_GPL(nvmf_unregister_transport);
 556
 557 static struct nvmf_transport_ops *nvmf_lookup_transport(
 558                 struct nvmf_ctrl_options *opts)
 559 {
 560         struct nvmf_transport_ops *ops;
 561
 562         lockdep_assert_held(&nvmf_transports_rwsem);
 563
 564         list_for_each_entry(ops, &nvmf_transports, entry) {
 565                 if (strcmp(ops->name, opts->transport) == 0)
 566                         return ops;
 567         }
 568
 569         return NULL;
 570 }
 571
 572 static const match_table_t opt_tokens = {
 573         { NVMF_OPT_TRANSPORT,           "transport=%s"          },
 574         { NVMF_OPT_TRADDR,              "traddr=%s"             },
 575         { NVMF_OPT_TRSVCID,             "trsvcid=%s"            },
 576         { NVMF_OPT_NQN,                 "nqn=%s"                },
 577         { NVMF_OPT_QUEUE_SIZE,          "queue_size=%d"         },
 578         { NVMF_OPT_NR_IO_QUEUES,        "nr_io_queues=%d"       },
 579         { NVMF_OPT_RECONNECT_DELAY,     "reconnect_delay=%d"    },
 580         { NVMF_OPT_CTRL_LOSS_TMO,       "ctrl_loss_tmo=%d"      },
 581         { NVMF_OPT_KATO,                "keep_alive_tmo=%d"     },
 582         { NVMF_OPT_HOSTNQN,             "hostnqn=%s"            },
 583         { NVMF_OPT_HOST_TRADDR,         "host_traddr=%s"        },
 584         { NVMF_OPT_HOST_IFACE,          "host_iface=%s"         },
 585         { NVMF_OPT_HOST_ID,             "hostid=%s"             },
 586         { NVMF_OPT_DUP_CONNECT,         "duplicate_connect"     },
 587         { NVMF_OPT_DISABLE_SQFLOW,      "disable_sqflow"        },
 588         { NVMF_OPT_HDR_DIGEST,          "hdr_digest"            },
 589         { NVMF_OPT_DATA_DIGEST,         "data_digest"           },
 590         { NVMF_OPT_NR_WRITE_QUEUES,     "nr_write_queues=%d"    },
 591         { NVMF_OPT_NR_POLL_QUEUES,      "nr_poll_queues=%d"     },
 592         { NVMF_OPT_TOS,                 "tos=%d"                },
 593         { NVMF_OPT_FAIL_FAST_TMO,       "fast_io_fail_tmo=%d"   },
 594         { NVMF_OPT_DISCOVERY,           "discovery"             },
 595         { NVMF_OPT_DHCHAP_SECRET,       "dhchap_secret=%s"      },
 596         { NVMF_OPT_DHCHAP_CTRL_SECRET,  "dhchap_ctrl_secret=%s" },
 597         { NVMF_OPT_ERR,                 NULL                    }
 598 };
 599
 600 static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
 601                 const char *buf)
 602 {
 603         substring_t args[MAX_OPT_ARGS];
 604         char *options, *o, *p;
 605         int token, ret = 0;
 606         size_t nqnlen  = 0;
 607         int ctrl_loss_tmo = NVMF_DEF_CTRL_LOSS_TMO;
 608         uuid_t hostid;
 609
 610         /* Set defaults */
 611         opts->queue_size = NVMF_DEF_QUEUE_SIZE;
 612         opts->nr_io_queues = num_online_cpus();
 613         opts->reconnect_delay = NVMF_DEF_RECONNECT_DELAY;
 614         opts->kato = 0;
 615         opts->duplicate_connect = false;
 616         opts->fast_io_fail_tmo = NVMF_DEF_FAIL_FAST_TMO;
 617         opts->hdr_digest = false;
 618         opts->data_digest = false;
 619         opts->tos = -1; /* < 0 == use transport default */
 620
 621         options = o = kstrdup(buf, GFP_KERNEL);
 622         if (!options)
 623                 return -ENOMEM;
 624
 625         uuid_gen(&hostid);
 626
 627         while ((p = strsep(&o, ",\n")) != NULL) {
 628                 if (!*p)
 629                         continue;
 630
 631                 token = match_token(p, opt_tokens, args);
 632                 opts->mask |= token;
 633                 switch (token) {
 634                 case NVMF_OPT_TRANSPORT:
 635                         p = match_strdup(args);
 636                         if (!p) {
 637                                 ret = -ENOMEM;
 638                                 goto out;
 639                         }
 640                         kfree(opts->transport);
 641                         opts->transport = p;
 642                         break;
 643                 case NVMF_OPT_NQN:
 644                         p = match_strdup(args);
 645                         if (!p) {
 646                                 ret = -ENOMEM;
 647                                 goto out;
 648                         }
 649                         kfree(opts->subsysnqn);
 650                         opts->subsysnqn = p;
 651                         nqnlen = strlen(opts->subsysnqn);
 652                         if (nqnlen >= NVMF_NQN_SIZE) {
 653                                 pr_err("%s needs to be < %d bytes\n",
 654                                         opts->subsysnqn, NVMF_NQN_SIZE);
 655                                 ret = -EINVAL;
 656                                 goto out;
 657                         }
 658                         opts->discovery_nqn =
 659                                 !(strcmp(opts->subsysnqn,
 660                                          NVME_DISC_SUBSYS_NAME));
 661                         break;
 662                 case NVMF_OPT_TRADDR:
 663                         p = match_strdup(args);
 664                         if (!p) {
 665                                 ret = -ENOMEM;
 666                                 goto out;
 667                         }
 668                         kfree(opts->traddr);
 669                         opts->traddr = p;
 670                         break;
 671                 case NVMF_OPT_TRSVCID:
 672                         p = match_strdup(args);
 673                         if (!p) {
 674                                 ret = -ENOMEM;
 675                                 goto out;
 676                         }
 677                         kfree(opts->trsvcid);
 678                         opts->trsvcid = p;
 679                         break;
 680                 case NVMF_OPT_QUEUE_SIZE:
 681                         if (match_int(args, &token)) {
 682                                 ret = -EINVAL;
 683                                 goto out;
 684                         }
 685                         if (token < NVMF_MIN_QUEUE_SIZE ||
 686                             token > NVMF_MAX_QUEUE_SIZE) {
 687                                 pr_err("Invalid queue_size %d\n", token);
 688                                 ret = -EINVAL;
 689                                 goto out;
 690                         }
 691                         opts->queue_size = token;
 692                         break;
 693                 case NVMF_OPT_NR_IO_QUEUES:
 694                         if (match_int(args, &token)) {
 695                                 ret = -EINVAL;
 696                                 goto out;
 697                         }
 698                         if (token <= 0) {
 699                                 pr_err("Invalid number of IOQs %d\n", token);
 700                                 ret = -EINVAL;
 701                                 goto out;
 702                         }
 703                         if (opts->discovery_nqn) {
 704                                 pr_debug("Ignoring nr_io_queues value for discovery controller\n");
 705                                 break;
 706                         }
 707
 708                         opts->nr_io_queues = min_t(unsigned int,
 709                                         num_online_cpus(), token);
 710                         break;
 711                 case NVMF_OPT_KATO:
 712                         if (match_int(args, &token)) {
 713                                 ret = -EINVAL;
 714                                 goto out;
 715                         }
 716
 717                         if (token < 0) {
 718                                 pr_err("Invalid keep_alive_tmo %d\n", token);
 719                                 ret = -EINVAL;
 720                                 goto out;
 721                         } else if (token == 0 && !opts->discovery_nqn) {
 722                                 /* Allowed for debug */
 723                                 pr_warn("keep_alive_tmo 0 won't execute keep alives!!!\n");
 724                         }
 725                         opts->kato = token;
 726                         break;
 727                 case NVMF_OPT_CTRL_LOSS_TMO:
 728                         if (match_int(args, &token)) {
 729                                 ret = -EINVAL;
 730                                 goto out;
 731                         }
 732
 733                         if (token < 0)
 734                                 pr_warn("ctrl_loss_tmo < 0 will reconnect forever\n");
 735                         ctrl_loss_tmo = token;
 736                         break;
 737                 case NVMF_OPT_FAIL_FAST_TMO:
 738                         if (match_int(args, &token)) {
 739                                 ret = -EINVAL;
 740                                 goto out;
 741                         }
 742
 743                         if (token >= 0)
 744                                 pr_warn("I/O fail on reconnect controller after %d sec\n",
 745                                         token);
 746                         else
 747                                 token = -1;
 748
 749                         opts->fast_io_fail_tmo = token;
 750                         break;
 751                 case NVMF_OPT_HOSTNQN:
 752                         if (opts->host) {
 753                                 pr_err("hostnqn already user-assigned: %s\n",
 754                                        opts->host->nqn);
 755                                 ret = -EADDRINUSE;
 756                                 goto out;
 757                         }
 758                         p = match_strdup(args);
 759                         if (!p) {
 760                                 ret = -ENOMEM;
 761                                 goto out;
 762                         }
 763                         nqnlen = strlen(p);
 764                         if (nqnlen >= NVMF_NQN_SIZE) {
 765                                 pr_err("%s needs to be < %d bytes\n",
 766                                         p, NVMF_NQN_SIZE);
 767                                 kfree(p);
 768                                 ret = -EINVAL;
 769                                 goto out;
 770                         }
 771                         opts->host = nvmf_host_add(p);
 772                         kfree(p);
 773                         if (!opts->host) {
 774                                 ret = -ENOMEM;
 775                                 goto out;
 776                         }
 777                         break;
 778                 case NVMF_OPT_RECONNECT_DELAY:
 779                         if (match_int(args, &token)) {
 780                                 ret = -EINVAL;
 781                                 goto out;
 782                         }
 783                         if (token <= 0) {
 784                                 pr_err("Invalid reconnect_delay %d\n", token);
 785                                 ret = -EINVAL;
 786                                 goto out;
 787                         }
 788                         opts->reconnect_delay = token;
 789                         break;
 790                 case NVMF_OPT_HOST_TRADDR:
 791                         p = match_strdup(args);
 792                         if (!p) {
 793                                 ret = -ENOMEM;
 794                                 goto out;
 795                         }
 796                         kfree(opts->host_traddr);
 797                         opts->host_traddr = p;
 798                         break;
 799                 case NVMF_OPT_HOST_IFACE:
 800                         p = match_strdup(args);
 801                         if (!p) {
 802                                 ret = -ENOMEM;
 803                                 goto out;
 804                         }
 805                         kfree(opts->host_iface);
 806                         opts->host_iface = p;
 807                         break;
 808                 case NVMF_OPT_HOST_ID:
 809                         p = match_strdup(args);
 810                         if (!p) {
 811                                 ret = -ENOMEM;
 812                                 goto out;
 813                         }
 814                         ret = uuid_parse(p, &hostid);
 815                         if (ret) {
 816                                 pr_err("Invalid hostid %s\n", p);
 817                                 ret = -EINVAL;
 818                                 kfree(p);
 819                                 goto out;
 820                         }
 821                         kfree(p);
 822                         break;
 823                 case NVMF_OPT_DUP_CONNECT:
 824                         opts->duplicate_connect = true;
 825                         break;
 826                 case NVMF_OPT_DISABLE_SQFLOW:
 827                         opts->disable_sqflow = true;
 828                         break;
 829                 case NVMF_OPT_HDR_DIGEST:
 830                         opts->hdr_digest = true;
 831                         break;
 832                 case NVMF_OPT_DATA_DIGEST:
 833                         opts->data_digest = true;
 834                         break;
 835                 case NVMF_OPT_NR_WRITE_QUEUES:
 836                         if (match_int(args, &token)) {
 837                                 ret = -EINVAL;
 838                                 goto out;
 839                         }
 840                         if (token <= 0) {
 841                                 pr_err("Invalid nr_write_queues %d\n", token);
 842                                 ret = -EINVAL;
 843                                 goto out;
 844                         }
 845                         opts->nr_write_queues = token;
 846                         break;
 847                 case NVMF_OPT_NR_POLL_QUEUES:
 848                         if (match_int(args, &token)) {
 849                                 ret = -EINVAL;
 850                                 goto out;
 851                         }
 852                         if (token <= 0) {
 853                                 pr_err("Invalid nr_poll_queues %d\n", token);
 854                                 ret = -EINVAL;
 855                                 goto out;
 856                         }
 857                         opts->nr_poll_queues = token;
 858                         break;
 859                 case NVMF_OPT_TOS:
 860                         if (match_int(args, &token)) {
 861                                 ret = -EINVAL;
 862                                 goto out;
 863                         }
 864                         if (token < 0) {
 865                                 pr_err("Invalid type of service %d\n", token);
 866                                 ret = -EINVAL;
 867                                 goto out;
 868                         }
 869                         if (token > 255) {
 870                                 pr_warn("Clamping type of service to 255\n");
 871                                 token = 255;
 872                         }
 873                         opts->tos = token;
 874                         break;
 875                 case NVMF_OPT_DISCOVERY:
 876                         opts->discovery_nqn = true;
 877                         break;
 878                 case NVMF_OPT_DHCHAP_SECRET:
 879                         p = match_strdup(args);
 880                         if (!p) {
 881                                 ret = -ENOMEM;
 882                                 goto out;
 883                         }
 884                         if (strlen(p) < 11 || strncmp(p, "DHHC-1:", 7)) {
 885                                 pr_err("Invalid DH-CHAP secret %s\n", p);
 886                                 ret = -EINVAL;
 887                                 goto out;
 888                         }
 889                         kfree(opts->dhchap_secret);
 890                         opts->dhchap_secret = p;
 891                         break;
 892                 case NVMF_OPT_DHCHAP_CTRL_SECRET:
 893                         p = match_strdup(args);
 894                         if (!p) {
 895                                 ret = -ENOMEM;
 896                                 goto out;
 897                         }
 898                         if (strlen(p) < 11 || strncmp(p, "DHHC-1:", 7)) {
 899                                 pr_err("Invalid DH-CHAP secret %s\n", p);
 900                                 ret = -EINVAL;
 901                                 goto out;
 902                         }
 903                         kfree(opts->dhchap_ctrl_secret);
 904                         opts->dhchap_ctrl_secret = p;
 905                         break;
 906                 default:
 907                         pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n",
 908                                 p);
 909                         ret = -EINVAL;
 910                         goto out;
 911                 }
 912         }
 913
 914         if (opts->discovery_nqn) {
 915                 opts->nr_io_queues = 0;
 916                 opts->nr_write_queues = 0;
 917                 opts->nr_poll_queues = 0;
 918                 opts->duplicate_connect = true;
 919         } else {
 920                 if (!opts->kato)
 921                         opts->kato = NVME_DEFAULT_KATO;
 922         }
 923         if (ctrl_loss_tmo < 0) {
 924                 opts->max_reconnects = -1;
 925         } else {
 926                 opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo,
 927                                                 opts->reconnect_delay);
 928                 if (ctrl_loss_tmo < opts->fast_io_fail_tmo)
 929                         pr_warn("failfast tmo (%d) larger than controller loss tmo (%d)\n",
 930                                 opts->fast_io_fail_tmo, ctrl_loss_tmo);
 931         }
 932
 933         if (!opts->host) {
 934                 kref_get(&nvmf_default_host->ref);
 935                 opts->host = nvmf_default_host;
 936         }
 937
 938         uuid_copy(&opts->host->id, &hostid);
 939
 940 out:
 941         kfree(options);
 942         return ret;
 943 }
 944
 945 static int nvmf_check_required_opts(struct nvmf_ctrl_options *opts,
 946                 unsigned int required_opts)
 947 {
 948         if ((opts->mask & required_opts) != required_opts) {
 949                 unsigned int i;
 950
 951                 for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) {
 952                         if ((opt_tokens[i].token & required_opts) &&
 953                             !(opt_tokens[i].token & opts->mask)) {
 954                                 pr_warn("missing parameter '%s'\n",
 955                                         opt_tokens[i].pattern);
 956                         }
 957                 }
 958
 959                 return -EINVAL;
 960         }
 961
 962         return 0;
 963 }
 964
 965 bool nvmf_ip_options_match(struct nvme_ctrl *ctrl,
 966                 struct nvmf_ctrl_options *opts)
 967 {
 968         if (!nvmf_ctlr_matches_baseopts(ctrl, opts) ||
 969             strcmp(opts->traddr, ctrl->opts->traddr) ||
 970             strcmp(opts->trsvcid, ctrl->opts->trsvcid))
 971                 return false;
 972
 973         /*
 974          * Checking the local address is rough. In most cases, none is specified
 975          * and the host port is selected by the stack.
 976          *
 977          * Assume no match if:
 978          * -  local address is specified and address is not the same
 979          * -  local address is not specified but remote is, or vice versa
 980          *    (admin using specific host_traddr when it matters).
 981          */
 982         if ((opts->mask & NVMF_OPT_HOST_TRADDR) &&
 983             (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)) {
 984                 if (strcmp(opts->host_traddr, ctrl->opts->host_traddr))
 985                         return false;
 986         } else if ((opts->mask & NVMF_OPT_HOST_TRADDR) ||
 987                    (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)) {
 988                 return false;
 989         }
 990
 991         return true;
 992 }
 993 EXPORT_SYMBOL_GPL(nvmf_ip_options_match);
 994
 995 static int nvmf_check_allowed_opts(struct nvmf_ctrl_options *opts,
 996                 unsigned int allowed_opts)
 997 {
 998         if (opts->mask & ~allowed_opts) {
 999                 unsigned int i;
1000
1001                 for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) {
1002                         if ((opt_tokens[i].token & opts->mask) &&
1003                             (opt_tokens[i].token & ~allowed_opts)) {
1004                                 pr_warn("invalid parameter '%s'\n",
1005                                         opt_tokens[i].pattern);
1006                         }
1007                 }
1008
1009                 return -EINVAL;
1010         }
1011
1012         return 0;
1013 }
1014
1015 void nvmf_free_options(struct nvmf_ctrl_options *opts)
1016 {
1017         nvmf_host_put(opts->host);
1018         kfree(opts->transport);
1019         kfree(opts->traddr);
1020         kfree(opts->trsvcid);
1021         kfree(opts->subsysnqn);
1022         kfree(opts->host_traddr);
1023         kfree(opts->host_iface);
1024         kfree(opts->dhchap_secret);
1025         kfree(opts->dhchap_ctrl_secret);
1026         kfree(opts);
1027 }
1028 EXPORT_SYMBOL_GPL(nvmf_free_options);
1029
1030 #define NVMF_REQUIRED_OPTS      (NVMF_OPT_TRANSPORT | NVMF_OPT_NQN)
1031 #define NVMF_ALLOWED_OPTS       (NVMF_OPT_QUEUE_SIZE | NVMF_OPT_NR_IO_QUEUES | \
1032                                  NVMF_OPT_KATO | NVMF_OPT_HOSTNQN | \
1033                                  NVMF_OPT_HOST_ID | NVMF_OPT_DUP_CONNECT |\
1034                                  NVMF_OPT_DISABLE_SQFLOW | NVMF_OPT_DISCOVERY |\
1035                                  NVMF_OPT_FAIL_FAST_TMO | NVMF_OPT_DHCHAP_SECRET |\
1036                                  NVMF_OPT_DHCHAP_CTRL_SECRET)
1037
1038 static struct nvme_ctrl *
1039 nvmf_create_ctrl(struct device *dev, const char *buf)
1040 {
1041         struct nvmf_ctrl_options *opts;
1042         struct nvmf_transport_ops *ops;
1043         struct nvme_ctrl *ctrl;
1044         int ret;
1045
1046         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1047         if (!opts)
1048                 return ERR_PTR(-ENOMEM);
1049
1050         ret = nvmf_parse_options(opts, buf);
1051         if (ret)
1052                 goto out_free_opts;
1053
1054
1055         request_module("nvme-%s", opts->transport);
1056
1057         /*
1058          * Check the generic options first as we need a valid transport for
1059          * the lookup below.  Then clear the generic flags so that transport
1060          * drivers don't have to care about them.
1061          */
1062         ret = nvmf_check_required_opts(opts, NVMF_REQUIRED_OPTS);
1063         if (ret)
1064                 goto out_free_opts;
1065         opts->mask &= ~NVMF_REQUIRED_OPTS;
1066
1067         down_read(&nvmf_transports_rwsem);
1068         ops = nvmf_lookup_transport(opts);
1069         if (!ops) {
1070                 pr_info("no handler found for transport %s.\n",
1071                         opts->transport);
1072                 ret = -EINVAL;
1073                 goto out_unlock;
1074         }
1075
1076         if (!try_module_get(ops->module)) {
1077                 ret = -EBUSY;
1078                 goto out_unlock;
1079         }
1080         up_read(&nvmf_transports_rwsem);
1081
1082         ret = nvmf_check_required_opts(opts, ops->required_opts);
1083         if (ret)
1084                 goto out_module_put;
1085         ret = nvmf_check_allowed_opts(opts, NVMF_ALLOWED_OPTS |
1086                                 ops->allowed_opts | ops->required_opts);
1087         if (ret)
1088                 goto out_module_put;
1089
1090         ctrl = ops->create_ctrl(dev, opts);
1091         if (IS_ERR(ctrl)) {
1092                 ret = PTR_ERR(ctrl);
1093                 goto out_module_put;
1094         }
1095
1096         module_put(ops->module);
1097         return ctrl;
1098
1099 out_module_put:
1100         module_put(ops->module);
1101         goto out_free_opts;
1102 out_unlock:
1103         up_read(&nvmf_transports_rwsem);
1104 out_free_opts:
1105         nvmf_free_options(opts);
1106         return ERR_PTR(ret);
1107 }
1108
1109 static struct class *nvmf_class;
1110 static struct device *nvmf_device;
1111 static DEFINE_MUTEX(nvmf_dev_mutex);
1112
1113 static ssize_t nvmf_dev_write(struct file *file, const char __user *ubuf,
1114                 size_t count, loff_t *pos)
1115 {
1116         struct seq_file *seq_file = file->private_data;
1117         struct nvme_ctrl *ctrl;
1118         const char *buf;
1119         int ret = 0;
1120
1121         if (count > PAGE_SIZE)
1122                 return -ENOMEM;
1123
1124         buf = memdup_user_nul(ubuf, count);
1125         if (IS_ERR(buf))
1126                 return PTR_ERR(buf);
1127
1128         mutex_lock(&nvmf_dev_mutex);
1129         if (seq_file->private) {
1130                 ret = -EINVAL;
1131                 goto out_unlock;
1132         }
1133
1134         ctrl = nvmf_create_ctrl(nvmf_device, buf);
1135         if (IS_ERR(ctrl)) {
1136                 ret = PTR_ERR(ctrl);
1137                 goto out_unlock;
1138         }
1139
1140         seq_file->private = ctrl;
1141
1142 out_unlock:
1143         mutex_unlock(&nvmf_dev_mutex);
1144         kfree(buf);
1145         return ret ? ret : count;
1146 }
1147
1148 static void __nvmf_concat_opt_tokens(struct seq_file *seq_file)
1149 {
1150         const struct match_token *tok;
1151         int idx;
1152
1153         /*
1154          * Add dummy entries for instance and cntlid to
1155          * signal an invalid/non-existing controller
1156          */
1157         seq_puts(seq_file, "instance=-1,cntlid=-1");
1158         for (idx = 0; idx < ARRAY_SIZE(opt_tokens); idx++) {
1159                 tok = &opt_tokens[idx];
1160                 if (tok->token == NVMF_OPT_ERR)
1161                         continue;
1162                 seq_puts(seq_file, ",");
1163                 seq_puts(seq_file, tok->pattern);
1164         }
1165         seq_puts(seq_file, "\n");
1166 }
1167
1168 static int nvmf_dev_show(struct seq_file *seq_file, void *private)
1169 {
1170         struct nvme_ctrl *ctrl;
1171
1172         mutex_lock(&nvmf_dev_mutex);
1173         ctrl = seq_file->private;
1174         if (!ctrl) {
1175                 __nvmf_concat_opt_tokens(seq_file);
1176                 goto out_unlock;
1177         }
1178
1179         seq_printf(seq_file, "instance=%d,cntlid=%d\n",
1180                         ctrl->instance, ctrl->cntlid);
1181
1182 out_unlock:
1183         mutex_unlock(&nvmf_dev_mutex);
1184         return 0;
1185 }
1186
1187 static int nvmf_dev_open(struct inode *inode, struct file *file)
1188 {
1189         /*
1190          * The miscdevice code initializes file->private_data, but doesn't
1191          * make use of it later.
1192          */
1193         file->private_data = NULL;
1194         return single_open(file, nvmf_dev_show, NULL);
1195 }
1196
1197 static int nvmf_dev_release(struct inode *inode, struct file *file)
1198 {
1199         struct seq_file *seq_file = file->private_data;
1200         struct nvme_ctrl *ctrl = seq_file->private;
1201
1202         if (ctrl)
1203                 nvme_put_ctrl(ctrl);
1204         return single_release(inode, file);
1205 }
1206
1207 static const struct file_operations nvmf_dev_fops = {
1208         .owner          = THIS_MODULE,
1209         .write          = nvmf_dev_write,
1210         .read           = seq_read,
1211         .open           = nvmf_dev_open,
1212         .release        = nvmf_dev_release,
1213 };
1214
1215 static struct miscdevice nvmf_misc = {
1216         .minor          = MISC_DYNAMIC_MINOR,
1217         .name           = "nvme-fabrics",
1218         .fops           = &nvmf_dev_fops,
1219 };
1220
1221 static int __init nvmf_init(void)
1222 {
1223         int ret;
1224
1225         nvmf_default_host = nvmf_host_default();
1226         if (!nvmf_default_host)
1227                 return -ENOMEM;
1228
1229         nvmf_class = class_create(THIS_MODULE, "nvme-fabrics");
1230         if (IS_ERR(nvmf_class)) {
1231                 pr_err("couldn't register class nvme-fabrics\n");
1232                 ret = PTR_ERR(nvmf_class);
1233                 goto out_free_host;
1234         }
1235
1236         nvmf_device =
1237                 device_create(nvmf_class, NULL, MKDEV(0, 0), NULL, "ctl");
1238         if (IS_ERR(nvmf_device)) {
1239                 pr_err("couldn't create nvme-fabrics device!\n");
1240                 ret = PTR_ERR(nvmf_device);
1241                 goto out_destroy_class;
1242         }
1243
1244         ret = misc_register(&nvmf_misc);
1245         if (ret) {
1246                 pr_err("couldn't register misc device: %d\n", ret);
1247                 goto out_destroy_device;
1248         }
1249
1250         return 0;
1251
1252 out_destroy_device:
1253         device_destroy(nvmf_class, MKDEV(0, 0));
1254 out_destroy_class:
1255         class_destroy(nvmf_class);
1256 out_free_host:
1257         nvmf_host_put(nvmf_default_host);
1258         return ret;
1259 }
1260
1261 static void __exit nvmf_exit(void)
1262 {
1263         misc_deregister(&nvmf_misc);
1264         device_destroy(nvmf_class, MKDEV(0, 0));
1265         class_destroy(nvmf_class);
1266         nvmf_host_put(nvmf_default_host);
1267
1268         BUILD_BUG_ON(sizeof(struct nvmf_common_command) != 64);
1269         BUILD_BUG_ON(sizeof(struct nvmf_connect_command) != 64);
1270         BUILD_BUG_ON(sizeof(struct nvmf_property_get_command) != 64);
1271         BUILD_BUG_ON(sizeof(struct nvmf_property_set_command) != 64);
1272         BUILD_BUG_ON(sizeof(struct nvmf_auth_send_command) != 64);
1273         BUILD_BUG_ON(sizeof(struct nvmf_auth_receive_command) != 64);
1274         BUILD_BUG_ON(sizeof(struct nvmf_connect_data) != 1024);
1275         BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_negotiate_data) != 8);
1276         BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_challenge_data) != 16);
1277         BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_reply_data) != 16);
1278         BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_success1_data) != 16);
1279         BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_success2_data) != 16);
1280 }
1281
1282 MODULE_LICENSE("GPL v2");
1283
1284 module_init(nvmf_init);
1285 module_exit(nvmf_exit);