drivers/nvme/target/admin-cmd.c

   1 /*
   2  * NVMe admin command implementation.
   3  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15 #include <linux/module.h>
  16 #include <linux/rculist.h>
  17
  18 #include <generated/utsrelease.h>
  19 #include <asm/unaligned.h>
  20 #include "nvmet.h"
  21
  22 u32 nvmet_get_log_page_len(struct nvme_command *cmd)
  23 {
  24         u32 len = le16_to_cpu(cmd->get_log_page.numdu);
  25
  26         len <<= 16;
  27         len += le16_to_cpu(cmd->get_log_page.numdl);
  28         /* NUMD is a 0's based value */
  29         len += 1;
  30         len *= sizeof(u32);
  31
  32         return len;
  33 }
  34
  35 static void nvmet_execute_get_log_page_noop(struct nvmet_req *req)
  36 {
  37         nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->data_len));
  38 }
  39
  40 static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
  41                 struct nvme_smart_log *slog)
  42 {
  43         struct nvmet_ns *ns;
  44         u64 host_reads, host_writes, data_units_read, data_units_written;
  45
  46         ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid);
  47         if (!ns) {
  48                 pr_err("nvmet : Could not find namespace id : %d\n",
  49                                 le32_to_cpu(req->cmd->get_log_page.nsid));
  50                 return NVME_SC_INVALID_NS;
  51         }
  52
  53         /* we don't have the right data for file backed ns */
  54         if (!ns->bdev)
  55                 goto out;
  56
  57         host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]);
  58         data_units_read = part_stat_read(ns->bdev->bd_part, sectors[READ]);
  59         host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]);
  60         data_units_written = part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
  61
  62         put_unaligned_le64(host_reads, &slog->host_reads[0]);
  63         put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
  64         put_unaligned_le64(host_writes, &slog->host_writes[0]);
  65         put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
  66 out:
  67         nvmet_put_namespace(ns);
  68
  69         return NVME_SC_SUCCESS;
  70 }
  71
  72 static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
  73                 struct nvme_smart_log *slog)
  74 {
  75         u64 host_reads = 0, host_writes = 0;
  76         u64 data_units_read = 0, data_units_written = 0;
  77         struct nvmet_ns *ns;
  78         struct nvmet_ctrl *ctrl;
  79
  80         ctrl = req->sq->ctrl;
  81
  82         rcu_read_lock();
  83         list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
  84                 /* we don't have the right data for file backed ns */
  85                 if (!ns->bdev)
  86                         continue;
  87                 host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]);
  88                 data_units_read +=
  89                         part_stat_read(ns->bdev->bd_part, sectors[READ]);
  90                 host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]);
  91                 data_units_written +=
  92                         part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
  93
  94         }
  95         rcu_read_unlock();
  96
  97         put_unaligned_le64(host_reads, &slog->host_reads[0]);
  98         put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
  99         put_unaligned_le64(host_writes, &slog->host_writes[0]);
 100         put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
 101
 102         return NVME_SC_SUCCESS;
 103 }
 104
 105 static void nvmet_execute_get_log_page_smart(struct nvmet_req *req)
 106 {
 107         struct nvme_smart_log *log;
 108         u16 status = NVME_SC_INTERNAL;
 109
 110         if (req->data_len != sizeof(*log))
 111                 goto out;
 112
 113         log = kzalloc(sizeof(*log), GFP_KERNEL);
 114         if (!log)
 115                 goto out;
 116
 117         if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL))
 118                 status = nvmet_get_smart_log_all(req, log);
 119         else
 120                 status = nvmet_get_smart_log_nsid(req, log);
 121         if (status)
 122                 goto out_free_log;
 123
 124         status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
 125 out_free_log:
 126         kfree(log);
 127 out:
 128         nvmet_req_complete(req, status);
 129 }
 130
 131 static void nvmet_execute_get_log_cmd_effects_ns(struct nvmet_req *req)
 132 {
 133         u16 status = NVME_SC_INTERNAL;
 134         struct nvme_effects_log *log;
 135
 136         log = kzalloc(sizeof(*log), GFP_KERNEL);
 137         if (!log)
 138                 goto out;
 139
 140         log->acs[nvme_admin_get_log_page]       = cpu_to_le32(1 << 0);
 141         log->acs[nvme_admin_identify]           = cpu_to_le32(1 << 0);
 142         log->acs[nvme_admin_abort_cmd]          = cpu_to_le32(1 << 0);
 143         log->acs[nvme_admin_set_features]       = cpu_to_le32(1 << 0);
 144         log->acs[nvme_admin_get_features]       = cpu_to_le32(1 << 0);
 145         log->acs[nvme_admin_async_event]        = cpu_to_le32(1 << 0);
 146         log->acs[nvme_admin_keep_alive]         = cpu_to_le32(1 << 0);
 147
 148         log->iocs[nvme_cmd_read]                = cpu_to_le32(1 << 0);
 149         log->iocs[nvme_cmd_write]               = cpu_to_le32(1 << 0);
 150         log->iocs[nvme_cmd_flush]               = cpu_to_le32(1 << 0);
 151         log->iocs[nvme_cmd_dsm]                 = cpu_to_le32(1 << 0);
 152         log->iocs[nvme_cmd_write_zeroes]        = cpu_to_le32(1 << 0);
 153
 154         status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
 155
 156         kfree(log);
 157 out:
 158         nvmet_req_complete(req, status);
 159 }
 160
 161 static void nvmet_execute_get_log_changed_ns(struct nvmet_req *req)
 162 {
 163         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 164         u16 status = NVME_SC_INTERNAL;
 165         size_t len;
 166
 167         if (req->data_len != NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32))
 168                 goto out;
 169
 170         mutex_lock(&ctrl->lock);
 171         if (ctrl->nr_changed_ns == U32_MAX)
 172                 len = sizeof(__le32);
 173         else
 174                 len = ctrl->nr_changed_ns * sizeof(__le32);
 175         status = nvmet_copy_to_sgl(req, 0, ctrl->changed_ns_list, len);
 176         if (!status)
 177                 status = nvmet_zero_sgl(req, len, req->data_len - len);
 178         ctrl->nr_changed_ns = 0;
 179         clear_bit(NVME_AEN_CFG_NS_ATTR, &ctrl->aen_masked);
 180         mutex_unlock(&ctrl->lock);
 181 out:
 182         nvmet_req_complete(req, status);
 183 }
 184
 185 static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 186 {
 187         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 188         struct nvme_id_ctrl *id;
 189         u16 status = 0;
 190         const char model[] = "Linux";
 191
 192         id = kzalloc(sizeof(*id), GFP_KERNEL);
 193         if (!id) {
 194                 status = NVME_SC_INTERNAL;
 195                 goto out;
 196         }
 197
 198         /* XXX: figure out how to assign real vendors IDs. */
 199         id->vid = 0;
 200         id->ssvid = 0;
 201
 202         memset(id->sn, ' ', sizeof(id->sn));
 203         bin2hex(id->sn, &ctrl->subsys->serial,
 204                 min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2));
 205         memcpy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1, ' ');
 206         memcpy_and_pad(id->fr, sizeof(id->fr),
 207                        UTS_RELEASE, strlen(UTS_RELEASE), ' ');
 208
 209         id->rab = 6;
 210
 211         /*
 212          * XXX: figure out how we can assign a IEEE OUI, but until then
 213          * the safest is to leave it as zeroes.
 214          */
 215
 216         /* we support multiple ports and multiples hosts: */
 217         id->cmic = (1 << 0) | (1 << 1);
 218
 219         /* no limit on data transfer sizes for now */
 220         id->mdts = 0;
 221         id->cntlid = cpu_to_le16(ctrl->cntlid);
 222         id->ver = cpu_to_le32(ctrl->subsys->ver);
 223
 224         /* XXX: figure out what to do about RTD3R/RTD3 */
 225         id->oaes = cpu_to_le32(NVMET_AEN_CFG_OPTIONAL);
 226         id->ctratt = cpu_to_le32(1 << 0);
 227
 228         id->oacs = 0;
 229
 230         /*
 231          * We don't really have a practical limit on the number of abort
 232          * comands.  But we don't do anything useful for abort either, so
 233          * no point in allowing more abort commands than the spec requires.
 234          */
 235         id->acl = 3;
 236
 237         id->aerl = NVMET_ASYNC_EVENTS - 1;
 238
 239         /* first slot is read-only, only one slot supported */
 240         id->frmw = (1 << 0) | (1 << 1);
 241         id->lpa = (1 << 0) | (1 << 1) | (1 << 2);
 242         id->elpe = NVMET_ERROR_LOG_SLOTS - 1;
 243         id->npss = 0;
 244
 245         /* We support keep-alive timeout in granularity of seconds */
 246         id->kas = cpu_to_le16(NVMET_KAS);
 247
 248         id->sqes = (0x6 << 4) | 0x6;
 249         id->cqes = (0x4 << 4) | 0x4;
 250
 251         /* no enforcement soft-limit for maxcmd - pick arbitrary high value */
 252         id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
 253
 254         id->nn = cpu_to_le32(ctrl->subsys->max_nsid);
 255         id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM |
 256                         NVME_CTRL_ONCS_WRITE_ZEROES);
 257
 258         /* XXX: don't report vwc if the underlying device is write through */
 259         id->vwc = NVME_CTRL_VWC_PRESENT;
 260
 261         /*
 262          * We can't support atomic writes bigger than a LBA without support
 263          * from the backend device.
 264          */
 265         id->awun = 0;
 266         id->awupf = 0;
 267
 268         id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
 269         if (ctrl->ops->has_keyed_sgls)
 270                 id->sgls |= cpu_to_le32(1 << 2);
 271         if (req->port->inline_data_size)
 272                 id->sgls |= cpu_to_le32(1 << 20);
 273
 274         strcpy(id->subnqn, ctrl->subsys->subsysnqn);
 275
 276         /* Max command capsule size is sqe + single page of in-capsule data */
 277         id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) +
 278                                   req->port->inline_data_size) / 16);
 279         /* Max response capsule size is cqe */
 280         id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
 281
 282         id->msdbd = ctrl->ops->msdbd;
 283
 284         /*
 285          * Meh, we don't really support any power state.  Fake up the same
 286          * values that qemu does.
 287          */
 288         id->psd[0].max_power = cpu_to_le16(0x9c4);
 289         id->psd[0].entry_lat = cpu_to_le32(0x10);
 290         id->psd[0].exit_lat = cpu_to_le32(0x4);
 291
 292         status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
 293
 294         kfree(id);
 295 out:
 296         nvmet_req_complete(req, status);
 297 }
 298
 299 static void nvmet_execute_identify_ns(struct nvmet_req *req)
 300 {
 301         struct nvmet_ns *ns;
 302         struct nvme_id_ns *id;
 303         u16 status = 0;
 304
 305         if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
 306                 status = NVME_SC_INVALID_NS | NVME_SC_DNR;
 307                 goto out;
 308         }
 309
 310         id = kzalloc(sizeof(*id), GFP_KERNEL);
 311         if (!id) {
 312                 status = NVME_SC_INTERNAL;
 313                 goto out;
 314         }
 315
 316         /* return an all zeroed buffer if we can't find an active namespace */
 317         ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
 318         if (!ns)
 319                 goto done;
 320
 321         /*
 322          * nuse = ncap = nsze isn't always true, but we have no way to find
 323          * that out from the underlying device.
 324          */
 325         id->ncap = id->nuse = id->nsze =
 326                 cpu_to_le64(ns->size >> ns->blksize_shift);
 327
 328         /*
 329          * We just provide a single LBA format that matches what the
 330          * underlying device reports.
 331          */
 332         id->nlbaf = 0;
 333         id->flbas = 0;
 334
 335         /*
 336          * Our namespace might always be shared.  Not just with other
 337          * controllers, but also with any other user of the block device.
 338          */
 339         id->nmic = (1 << 0);
 340
 341         memcpy(&id->nguid, &ns->nguid, sizeof(id->nguid));
 342
 343         id->lbaf[0].ds = ns->blksize_shift;
 344
 345         nvmet_put_namespace(ns);
 346 done:
 347         status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
 348         kfree(id);
 349 out:
 350         nvmet_req_complete(req, status);
 351 }
 352
 353 static void nvmet_execute_identify_nslist(struct nvmet_req *req)
 354 {
 355         static const int buf_size = NVME_IDENTIFY_DATA_SIZE;
 356         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 357         struct nvmet_ns *ns;
 358         u32 min_nsid = le32_to_cpu(req->cmd->identify.nsid);
 359         __le32 *list;
 360         u16 status = 0;
 361         int i = 0;
 362
 363         list = kzalloc(buf_size, GFP_KERNEL);
 364         if (!list) {
 365                 status = NVME_SC_INTERNAL;
 366                 goto out;
 367         }
 368
 369         rcu_read_lock();
 370         list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
 371                 if (ns->nsid <= min_nsid)
 372                         continue;
 373                 list[i++] = cpu_to_le32(ns->nsid);
 374                 if (i == buf_size / sizeof(__le32))
 375                         break;
 376         }
 377         rcu_read_unlock();
 378
 379         status = nvmet_copy_to_sgl(req, 0, list, buf_size);
 380
 381         kfree(list);
 382 out:
 383         nvmet_req_complete(req, status);
 384 }
 385
 386 static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
 387                                     void *id, off_t *off)
 388 {
 389         struct nvme_ns_id_desc desc = {
 390                 .nidt = type,
 391                 .nidl = len,
 392         };
 393         u16 status;
 394
 395         status = nvmet_copy_to_sgl(req, *off, &desc, sizeof(desc));
 396         if (status)
 397                 return status;
 398         *off += sizeof(desc);
 399
 400         status = nvmet_copy_to_sgl(req, *off, id, len);
 401         if (status)
 402                 return status;
 403         *off += len;
 404
 405         return 0;
 406 }
 407
 408 static void nvmet_execute_identify_desclist(struct nvmet_req *req)
 409 {
 410         struct nvmet_ns *ns;
 411         u16 status = 0;
 412         off_t off = 0;
 413
 414         ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
 415         if (!ns) {
 416                 status = NVME_SC_INVALID_NS | NVME_SC_DNR;
 417                 goto out;
 418         }
 419
 420         if (memchr_inv(&ns->uuid, 0, sizeof(ns->uuid))) {
 421                 status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID,
 422                                                   NVME_NIDT_UUID_LEN,
 423                                                   &ns->uuid, &off);
 424                 if (status)
 425                         goto out_put_ns;
 426         }
 427         if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) {
 428                 status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID,
 429                                                   NVME_NIDT_NGUID_LEN,
 430                                                   &ns->nguid, &off);
 431                 if (status)
 432                         goto out_put_ns;
 433         }
 434
 435         if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off,
 436                         off) != NVME_IDENTIFY_DATA_SIZE - off)
 437                 status = NVME_SC_INTERNAL | NVME_SC_DNR;
 438 out_put_ns:
 439         nvmet_put_namespace(ns);
 440 out:
 441         nvmet_req_complete(req, status);
 442 }
 443
 444 /*
 445  * A "minimum viable" abort implementation: the command is mandatory in the
 446  * spec, but we are not required to do any useful work.  We couldn't really
 447  * do a useful abort, so don't bother even with waiting for the command
 448  * to be exectuted and return immediately telling the command to abort
 449  * wasn't found.
 450  */
 451 static void nvmet_execute_abort(struct nvmet_req *req)
 452 {
 453         nvmet_set_result(req, 1);
 454         nvmet_req_complete(req, 0);
 455 }
 456
 457 static void nvmet_execute_set_features(struct nvmet_req *req)
 458 {
 459         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 460         u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]);
 461         u32 val32;
 462         u16 status = 0;
 463
 464         switch (cdw10 & 0xff) {
 465         case NVME_FEAT_NUM_QUEUES:
 466                 nvmet_set_result(req,
 467                         (subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16));
 468                 break;
 469         case NVME_FEAT_KATO:
 470                 val32 = le32_to_cpu(req->cmd->common.cdw10[1]);
 471                 req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000);
 472                 nvmet_set_result(req, req->sq->ctrl->kato);
 473                 break;
 474         case NVME_FEAT_ASYNC_EVENT:
 475                 val32 = le32_to_cpu(req->cmd->common.cdw10[1]);
 476                 if (val32 & ~NVMET_AEN_CFG_ALL) {
 477                         status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 478                         break;
 479                 }
 480
 481                 WRITE_ONCE(req->sq->ctrl->aen_enabled, val32);
 482                 nvmet_set_result(req, val32);
 483                 break;
 484         case NVME_FEAT_HOST_ID:
 485                 status = NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
 486                 break;
 487         default:
 488                 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 489                 break;
 490         }
 491
 492         nvmet_req_complete(req, status);
 493 }
 494
 495 static void nvmet_execute_get_features(struct nvmet_req *req)
 496 {
 497         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 498         u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]);
 499         u16 status = 0;
 500
 501         switch (cdw10 & 0xff) {
 502         /*
 503          * These features are mandatory in the spec, but we don't
 504          * have a useful way to implement them.  We'll eventually
 505          * need to come up with some fake values for these.
 506          */
 507 #if 0
 508         case NVME_FEAT_ARBITRATION:
 509                 break;
 510         case NVME_FEAT_POWER_MGMT:
 511                 break;
 512         case NVME_FEAT_TEMP_THRESH:
 513                 break;
 514         case NVME_FEAT_ERR_RECOVERY:
 515                 break;
 516         case NVME_FEAT_IRQ_COALESCE:
 517                 break;
 518         case NVME_FEAT_IRQ_CONFIG:
 519                 break;
 520         case NVME_FEAT_WRITE_ATOMIC:
 521                 break;
 522 #endif
 523         case NVME_FEAT_ASYNC_EVENT:
 524                 nvmet_set_result(req, READ_ONCE(req->sq->ctrl->aen_enabled));
 525                 break;
 526         case NVME_FEAT_VOLATILE_WC:
 527                 nvmet_set_result(req, 1);
 528                 break;
 529         case NVME_FEAT_NUM_QUEUES:
 530                 nvmet_set_result(req,
 531                         (subsys->max_qid-1) | ((subsys->max_qid-1) << 16));
 532                 break;
 533         case NVME_FEAT_KATO:
 534                 nvmet_set_result(req, req->sq->ctrl->kato * 1000);
 535                 break;
 536         case NVME_FEAT_HOST_ID:
 537                 /* need 128-bit host identifier flag */
 538                 if (!(req->cmd->common.cdw10[1] & cpu_to_le32(1 << 0))) {
 539                         status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 540                         break;
 541                 }
 542
 543                 status = nvmet_copy_to_sgl(req, 0, &req->sq->ctrl->hostid,
 544                                 sizeof(req->sq->ctrl->hostid));
 545                 break;
 546         default:
 547                 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 548                 break;
 549         }
 550
 551         nvmet_req_complete(req, status);
 552 }
 553
 554 static void nvmet_execute_async_event(struct nvmet_req *req)
 555 {
 556         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 557
 558         mutex_lock(&ctrl->lock);
 559         if (ctrl->nr_async_event_cmds >= NVMET_ASYNC_EVENTS) {
 560                 mutex_unlock(&ctrl->lock);
 561                 nvmet_req_complete(req, NVME_SC_ASYNC_LIMIT | NVME_SC_DNR);
 562                 return;
 563         }
 564         ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req;
 565         mutex_unlock(&ctrl->lock);
 566
 567         schedule_work(&ctrl->async_event_work);
 568 }
 569
 570 static void nvmet_execute_keep_alive(struct nvmet_req *req)
 571 {
 572         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 573
 574         pr_debug("ctrl %d update keep-alive timer for %d secs\n",
 575                 ctrl->cntlid, ctrl->kato);
 576
 577         mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
 578         nvmet_req_complete(req, 0);
 579 }
 580
 581 u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
 582 {
 583         struct nvme_command *cmd = req->cmd;
 584         u16 ret;
 585
 586         ret = nvmet_check_ctrl_status(req, cmd);
 587         if (unlikely(ret))
 588                 return ret;
 589
 590         switch (cmd->common.opcode) {
 591         case nvme_admin_get_log_page:
 592                 req->data_len = nvmet_get_log_page_len(cmd);
 593
 594                 switch (cmd->get_log_page.lid) {
 595                 case NVME_LOG_ERROR:
 596                         /*
 597                          * We currently never set the More bit in the status
 598                          * field, so all error log entries are invalid and can
 599                          * be zeroed out.  This is called a minum viable
 600                          * implementation (TM) of this mandatory log page.
 601                          */
 602                         req->execute = nvmet_execute_get_log_page_noop;
 603                         return 0;
 604                 case NVME_LOG_SMART:
 605                         req->execute = nvmet_execute_get_log_page_smart;
 606                         return 0;
 607                 case NVME_LOG_FW_SLOT:
 608                         /*
 609                          * We only support a single firmware slot which always
 610                          * is active, so we can zero out the whole firmware slot
 611                          * log and still claim to fully implement this mandatory
 612                          * log page.
 613                          */
 614                         req->execute = nvmet_execute_get_log_page_noop;
 615                         return 0;
 616                 case NVME_LOG_CHANGED_NS:
 617                         req->execute = nvmet_execute_get_log_changed_ns;
 618                         return 0;
 619                 case NVME_LOG_CMD_EFFECTS:
 620                         req->execute = nvmet_execute_get_log_cmd_effects_ns;
 621                         return 0;
 622                 }
 623                 break;
 624         case nvme_admin_identify:
 625                 req->data_len = NVME_IDENTIFY_DATA_SIZE;
 626                 switch (cmd->identify.cns) {
 627                 case NVME_ID_CNS_NS:
 628                         req->execute = nvmet_execute_identify_ns;
 629                         return 0;
 630                 case NVME_ID_CNS_CTRL:
 631                         req->execute = nvmet_execute_identify_ctrl;
 632                         return 0;
 633                 case NVME_ID_CNS_NS_ACTIVE_LIST:
 634                         req->execute = nvmet_execute_identify_nslist;
 635                         return 0;
 636                 case NVME_ID_CNS_NS_DESC_LIST:
 637                         req->execute = nvmet_execute_identify_desclist;
 638                         return 0;
 639                 }
 640                 break;
 641         case nvme_admin_abort_cmd:
 642                 req->execute = nvmet_execute_abort;
 643                 req->data_len = 0;
 644                 return 0;
 645         case nvme_admin_set_features:
 646                 req->execute = nvmet_execute_set_features;
 647                 req->data_len = 0;
 648                 return 0;
 649         case nvme_admin_get_features:
 650                 req->execute = nvmet_execute_get_features;
 651                 req->data_len = 0;
 652                 return 0;
 653         case nvme_admin_async_event:
 654                 req->execute = nvmet_execute_async_event;
 655                 req->data_len = 0;
 656                 return 0;
 657         case nvme_admin_keep_alive:
 658                 req->execute = nvmet_execute_keep_alive;
 659                 req->data_len = 0;
 660                 return 0;
 661         }
 662
 663         pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
 664                req->sq->qid);
 665         return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
 666 }