1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NVMe admin command implementation. 4 * Copyright (c) 2015-2016 HGST, a Western Digital Company. 5 */ 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 #include <linux/module.h> 8 #include <linux/rculist.h> 9 #include <linux/part_stat.h> 10 11 #include <generated/utsrelease.h> 12 #include <asm/unaligned.h> 13 #include "nvmet.h" 14 15 u32 nvmet_get_log_page_len(struct nvme_command *cmd) 16 { 17 u32 len = le16_to_cpu(cmd->get_log_page.numdu); 18 19 len <<= 16; 20 len += le16_to_cpu(cmd->get_log_page.numdl); 21 /* NUMD is a 0's based value */ 22 len += 1; 23 len *= sizeof(u32); 24 25 return len; 26 } 27 28 static u32 nvmet_feat_data_len(struct nvmet_req *req, u32 cdw10) 29 { 30 switch (cdw10 & 0xff) { 31 case NVME_FEAT_HOST_ID: 32 return sizeof(req->sq->ctrl->hostid); 33 default: 34 return 0; 35 } 36 } 37 38 u64 nvmet_get_log_page_offset(struct nvme_command *cmd) 39 { 40 return le64_to_cpu(cmd->get_log_page.lpo); 41 } 42 43 static void nvmet_execute_get_log_page_noop(struct nvmet_req *req) 44 { 45 nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->transfer_len)); 46 } 47 48 static void nvmet_execute_get_log_page_error(struct nvmet_req *req) 49 { 50 struct nvmet_ctrl *ctrl = req->sq->ctrl; 51 unsigned long flags; 52 off_t offset = 0; 53 u64 slot; 54 u64 i; 55 56 spin_lock_irqsave(&ctrl->error_lock, flags); 57 slot = ctrl->err_counter % NVMET_ERROR_LOG_SLOTS; 58 59 for (i = 0; i < NVMET_ERROR_LOG_SLOTS; i++) { 60 if (nvmet_copy_to_sgl(req, offset, &ctrl->slots[slot], 61 sizeof(struct nvme_error_slot))) 62 break; 63 64 if (slot == 0) 65 slot = NVMET_ERROR_LOG_SLOTS - 1; 66 else 67 slot--; 68 offset += sizeof(struct nvme_error_slot); 69 } 70 spin_unlock_irqrestore(&ctrl->error_lock, flags); 71 nvmet_req_complete(req, 0); 72 } 73 74 static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req, 75 struct nvme_smart_log *slog) 76 { 77 u64 host_reads, host_writes, data_units_read, data_units_written; 78 u16 status; 79 80 status = nvmet_req_find_ns(req); 81 if (status) 82 return status; 83 84 /* we don't have the right data for file backed ns */ 85 if (!req->ns->bdev) 86 return NVME_SC_SUCCESS; 87 88 host_reads = part_stat_read(req->ns->bdev, ios[READ]); 89 data_units_read = 90 DIV_ROUND_UP(part_stat_read(req->ns->bdev, sectors[READ]), 1000); 91 host_writes = part_stat_read(req->ns->bdev, ios[WRITE]); 92 data_units_written = 93 DIV_ROUND_UP(part_stat_read(req->ns->bdev, sectors[WRITE]), 1000); 94 95 put_unaligned_le64(host_reads, &slog->host_reads[0]); 96 put_unaligned_le64(data_units_read, &slog->data_units_read[0]); 97 put_unaligned_le64(host_writes, &slog->host_writes[0]); 98 put_unaligned_le64(data_units_written, &slog->data_units_written[0]); 99 100 return NVME_SC_SUCCESS; 101 } 102 103 static u16 nvmet_get_smart_log_all(struct nvmet_req *req, 104 struct nvme_smart_log *slog) 105 { 106 u64 host_reads = 0, host_writes = 0; 107 u64 data_units_read = 0, data_units_written = 0; 108 struct nvmet_ns *ns; 109 struct nvmet_ctrl *ctrl; 110 unsigned long idx; 111 112 ctrl = req->sq->ctrl; 113 xa_for_each(&ctrl->subsys->namespaces, idx, ns) { 114 /* we don't have the right data for file backed ns */ 115 if (!ns->bdev) 116 continue; 117 host_reads += part_stat_read(ns->bdev, ios[READ]); 118 data_units_read += DIV_ROUND_UP( 119 part_stat_read(ns->bdev, sectors[READ]), 1000); 120 host_writes += part_stat_read(ns->bdev, ios[WRITE]); 121 data_units_written += DIV_ROUND_UP( 122 part_stat_read(ns->bdev, sectors[WRITE]), 1000); 123 } 124 125 put_unaligned_le64(host_reads, &slog->host_reads[0]); 126 put_unaligned_le64(data_units_read, &slog->data_units_read[0]); 127 put_unaligned_le64(host_writes, &slog->host_writes[0]); 128 put_unaligned_le64(data_units_written, &slog->data_units_written[0]); 129 130 return NVME_SC_SUCCESS; 131 } 132 133 static void nvmet_execute_get_log_page_smart(struct nvmet_req *req) 134 { 135 struct nvme_smart_log *log; 136 u16 status = NVME_SC_INTERNAL; 137 unsigned long flags; 138 139 if (req->transfer_len != sizeof(*log)) 140 goto out; 141 142 log = kzalloc(sizeof(*log), GFP_KERNEL); 143 if (!log) 144 goto out; 145 146 if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL)) 147 status = nvmet_get_smart_log_all(req, log); 148 else 149 status = nvmet_get_smart_log_nsid(req, log); 150 if (status) 151 goto out_free_log; 152 153 spin_lock_irqsave(&req->sq->ctrl->error_lock, flags); 154 put_unaligned_le64(req->sq->ctrl->err_counter, 155 &log->num_err_log_entries); 156 spin_unlock_irqrestore(&req->sq->ctrl->error_lock, flags); 157 158 status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log)); 159 out_free_log: 160 kfree(log); 161 out: 162 nvmet_req_complete(req, status); 163 } 164 165 static void nvmet_get_cmd_effects_nvm(struct nvme_effects_log *log) 166 { 167 log->acs[nvme_admin_get_log_page] = cpu_to_le32(1 << 0); 168 log->acs[nvme_admin_identify] = cpu_to_le32(1 << 0); 169 log->acs[nvme_admin_abort_cmd] = cpu_to_le32(1 << 0); 170 log->acs[nvme_admin_set_features] = cpu_to_le32(1 << 0); 171 log->acs[nvme_admin_get_features] = cpu_to_le32(1 << 0); 172 log->acs[nvme_admin_async_event] = cpu_to_le32(1 << 0); 173 log->acs[nvme_admin_keep_alive] = cpu_to_le32(1 << 0); 174 175 log->iocs[nvme_cmd_read] = cpu_to_le32(1 << 0); 176 log->iocs[nvme_cmd_write] = cpu_to_le32(1 << 0); 177 log->iocs[nvme_cmd_flush] = cpu_to_le32(1 << 0); 178 log->iocs[nvme_cmd_dsm] = cpu_to_le32(1 << 0); 179 log->iocs[nvme_cmd_write_zeroes] = cpu_to_le32(1 << 0); 180 } 181 182 static void nvmet_execute_get_log_cmd_effects_ns(struct nvmet_req *req) 183 { 184 struct nvme_effects_log *log; 185 u16 status = NVME_SC_SUCCESS; 186 187 log = kzalloc(sizeof(*log), GFP_KERNEL); 188 if (!log) { 189 status = NVME_SC_INTERNAL; 190 goto out; 191 } 192 193 switch (req->cmd->get_log_page.csi) { 194 case NVME_CSI_NVM: 195 nvmet_get_cmd_effects_nvm(log); 196 break; 197 default: 198 status = NVME_SC_INVALID_LOG_PAGE; 199 goto free; 200 } 201 202 status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log)); 203 free: 204 kfree(log); 205 out: 206 nvmet_req_complete(req, status); 207 } 208 209 static void nvmet_execute_get_log_changed_ns(struct nvmet_req *req) 210 { 211 struct nvmet_ctrl *ctrl = req->sq->ctrl; 212 u16 status = NVME_SC_INTERNAL; 213 size_t len; 214 215 if (req->transfer_len != NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32)) 216 goto out; 217 218 mutex_lock(&ctrl->lock); 219 if (ctrl->nr_changed_ns == U32_MAX) 220 len = sizeof(__le32); 221 else 222 len = ctrl->nr_changed_ns * sizeof(__le32); 223 status = nvmet_copy_to_sgl(req, 0, ctrl->changed_ns_list, len); 224 if (!status) 225 status = nvmet_zero_sgl(req, len, req->transfer_len - len); 226 ctrl->nr_changed_ns = 0; 227 nvmet_clear_aen_bit(req, NVME_AEN_BIT_NS_ATTR); 228 mutex_unlock(&ctrl->lock); 229 out: 230 nvmet_req_complete(req, status); 231 } 232 233 static u32 nvmet_format_ana_group(struct nvmet_req *req, u32 grpid, 234 struct nvme_ana_group_desc *desc) 235 { 236 struct nvmet_ctrl *ctrl = req->sq->ctrl; 237 struct nvmet_ns *ns; 238 unsigned long idx; 239 u32 count = 0; 240 241 if (!(req->cmd->get_log_page.lsp & NVME_ANA_LOG_RGO)) { 242 xa_for_each(&ctrl->subsys->namespaces, idx, ns) 243 if (ns->anagrpid == grpid) 244 desc->nsids[count++] = cpu_to_le32(ns->nsid); 245 } 246 247 desc->grpid = cpu_to_le32(grpid); 248 desc->nnsids = cpu_to_le32(count); 249 desc->chgcnt = cpu_to_le64(nvmet_ana_chgcnt); 250 desc->state = req->port->ana_state[grpid]; 251 memset(desc->rsvd17, 0, sizeof(desc->rsvd17)); 252 return sizeof(struct nvme_ana_group_desc) + count * sizeof(__le32); 253 } 254 255 static void nvmet_execute_get_log_page_ana(struct nvmet_req *req) 256 { 257 struct nvme_ana_rsp_hdr hdr = { 0, }; 258 struct nvme_ana_group_desc *desc; 259 size_t offset = sizeof(struct nvme_ana_rsp_hdr); /* start beyond hdr */ 260 size_t len; 261 u32 grpid; 262 u16 ngrps = 0; 263 u16 status; 264 265 status = NVME_SC_INTERNAL; 266 desc = kmalloc(sizeof(struct nvme_ana_group_desc) + 267 NVMET_MAX_NAMESPACES * sizeof(__le32), GFP_KERNEL); 268 if (!desc) 269 goto out; 270 271 down_read(&nvmet_ana_sem); 272 for (grpid = 1; grpid <= NVMET_MAX_ANAGRPS; grpid++) { 273 if (!nvmet_ana_group_enabled[grpid]) 274 continue; 275 len = nvmet_format_ana_group(req, grpid, desc); 276 status = nvmet_copy_to_sgl(req, offset, desc, len); 277 if (status) 278 break; 279 offset += len; 280 ngrps++; 281 } 282 for ( ; grpid <= NVMET_MAX_ANAGRPS; grpid++) { 283 if (nvmet_ana_group_enabled[grpid]) 284 ngrps++; 285 } 286 287 hdr.chgcnt = cpu_to_le64(nvmet_ana_chgcnt); 288 hdr.ngrps = cpu_to_le16(ngrps); 289 nvmet_clear_aen_bit(req, NVME_AEN_BIT_ANA_CHANGE); 290 up_read(&nvmet_ana_sem); 291 292 kfree(desc); 293 294 /* copy the header last once we know the number of groups */ 295 status = nvmet_copy_to_sgl(req, 0, &hdr, sizeof(hdr)); 296 out: 297 nvmet_req_complete(req, status); 298 } 299 300 static void nvmet_execute_get_log_page(struct nvmet_req *req) 301 { 302 if (!nvmet_check_transfer_len(req, nvmet_get_log_page_len(req->cmd))) 303 return; 304 305 switch (req->cmd->get_log_page.lid) { 306 case NVME_LOG_ERROR: 307 return nvmet_execute_get_log_page_error(req); 308 case NVME_LOG_SMART: 309 return nvmet_execute_get_log_page_smart(req); 310 case NVME_LOG_FW_SLOT: 311 /* 312 * We only support a single firmware slot which always is 313 * active, so we can zero out the whole firmware slot log and 314 * still claim to fully implement this mandatory log page. 315 */ 316 return nvmet_execute_get_log_page_noop(req); 317 case NVME_LOG_CHANGED_NS: 318 return nvmet_execute_get_log_changed_ns(req); 319 case NVME_LOG_CMD_EFFECTS: 320 return nvmet_execute_get_log_cmd_effects_ns(req); 321 case NVME_LOG_ANA: 322 return nvmet_execute_get_log_page_ana(req); 323 } 324 pr_debug("unhandled lid %d on qid %d\n", 325 req->cmd->get_log_page.lid, req->sq->qid); 326 req->error_loc = offsetof(struct nvme_get_log_page_command, lid); 327 nvmet_req_complete(req, NVME_SC_INVALID_FIELD | NVME_SC_DNR); 328 } 329 330 static void nvmet_execute_identify_ctrl(struct nvmet_req *req) 331 { 332 struct nvmet_ctrl *ctrl = req->sq->ctrl; 333 struct nvmet_subsys *subsys = ctrl->subsys; 334 struct nvme_id_ctrl *id; 335 u32 cmd_capsule_size; 336 u16 status = 0; 337 338 if (!subsys->subsys_discovered) { 339 mutex_lock(&subsys->lock); 340 subsys->subsys_discovered = true; 341 mutex_unlock(&subsys->lock); 342 } 343 344 id = kzalloc(sizeof(*id), GFP_KERNEL); 345 if (!id) { 346 status = NVME_SC_INTERNAL; 347 goto out; 348 } 349 350 /* XXX: figure out how to assign real vendors IDs. */ 351 id->vid = 0; 352 id->ssvid = 0; 353 354 memcpy(id->sn, ctrl->subsys->serial, NVMET_SN_MAX_SIZE); 355 memcpy_and_pad(id->mn, sizeof(id->mn), subsys->model_number, 356 strlen(subsys->model_number), ' '); 357 memcpy_and_pad(id->fr, sizeof(id->fr), 358 UTS_RELEASE, strlen(UTS_RELEASE), ' '); 359 360 id->rab = 6; 361 362 /* 363 * XXX: figure out how we can assign a IEEE OUI, but until then 364 * the safest is to leave it as zeroes. 365 */ 366 367 /* we support multiple ports, multiples hosts and ANA: */ 368 id->cmic = (1 << 0) | (1 << 1) | (1 << 3); 369 370 /* Limit MDTS according to transport capability */ 371 if (ctrl->ops->get_mdts) 372 id->mdts = ctrl->ops->get_mdts(ctrl); 373 else 374 id->mdts = 0; 375 376 id->cntlid = cpu_to_le16(ctrl->cntlid); 377 id->ver = cpu_to_le32(ctrl->subsys->ver); 378 379 /* XXX: figure out what to do about RTD3R/RTD3 */ 380 id->oaes = cpu_to_le32(NVMET_AEN_CFG_OPTIONAL); 381 id->ctratt = cpu_to_le32(NVME_CTRL_ATTR_HID_128_BIT | 382 NVME_CTRL_ATTR_TBKAS); 383 384 id->oacs = 0; 385 386 /* 387 * We don't really have a practical limit on the number of abort 388 * comands. But we don't do anything useful for abort either, so 389 * no point in allowing more abort commands than the spec requires. 390 */ 391 id->acl = 3; 392 393 id->aerl = NVMET_ASYNC_EVENTS - 1; 394 395 /* first slot is read-only, only one slot supported */ 396 id->frmw = (1 << 0) | (1 << 1); 397 id->lpa = (1 << 0) | (1 << 1) | (1 << 2); 398 id->elpe = NVMET_ERROR_LOG_SLOTS - 1; 399 id->npss = 0; 400 401 /* We support keep-alive timeout in granularity of seconds */ 402 id->kas = cpu_to_le16(NVMET_KAS); 403 404 id->sqes = (0x6 << 4) | 0x6; 405 id->cqes = (0x4 << 4) | 0x4; 406 407 /* no enforcement soft-limit for maxcmd - pick arbitrary high value */ 408 id->maxcmd = cpu_to_le16(NVMET_MAX_CMD); 409 410 id->nn = cpu_to_le32(ctrl->subsys->max_nsid); 411 id->mnan = cpu_to_le32(NVMET_MAX_NAMESPACES); 412 id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM | 413 NVME_CTRL_ONCS_WRITE_ZEROES); 414 415 /* XXX: don't report vwc if the underlying device is write through */ 416 id->vwc = NVME_CTRL_VWC_PRESENT; 417 418 /* 419 * We can't support atomic writes bigger than a LBA without support 420 * from the backend device. 421 */ 422 id->awun = 0; 423 id->awupf = 0; 424 425 id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */ 426 if (ctrl->ops->flags & NVMF_KEYED_SGLS) 427 id->sgls |= cpu_to_le32(1 << 2); 428 if (req->port->inline_data_size) 429 id->sgls |= cpu_to_le32(1 << 20); 430 431 strlcpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn)); 432 433 /* 434 * Max command capsule size is sqe + in-capsule data size. 435 * Disable in-capsule data for Metadata capable controllers. 436 */ 437 cmd_capsule_size = sizeof(struct nvme_command); 438 if (!ctrl->pi_support) 439 cmd_capsule_size += req->port->inline_data_size; 440 id->ioccsz = cpu_to_le32(cmd_capsule_size / 16); 441 442 /* Max response capsule size is cqe */ 443 id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16); 444 445 id->msdbd = ctrl->ops->msdbd; 446 447 id->anacap = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4); 448 id->anatt = 10; /* random value */ 449 id->anagrpmax = cpu_to_le32(NVMET_MAX_ANAGRPS); 450 id->nanagrpid = cpu_to_le32(NVMET_MAX_ANAGRPS); 451 452 /* 453 * Meh, we don't really support any power state. Fake up the same 454 * values that qemu does. 455 */ 456 id->psd[0].max_power = cpu_to_le16(0x9c4); 457 id->psd[0].entry_lat = cpu_to_le32(0x10); 458 id->psd[0].exit_lat = cpu_to_le32(0x4); 459 460 id->nwpc = 1 << 0; /* write protect and no write protect */ 461 462 status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id)); 463 464 kfree(id); 465 out: 466 nvmet_req_complete(req, status); 467 } 468 469 static void nvmet_execute_identify_ns(struct nvmet_req *req) 470 { 471 struct nvme_id_ns *id; 472 u16 status; 473 474 if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) { 475 req->error_loc = offsetof(struct nvme_identify, nsid); 476 status = NVME_SC_INVALID_NS | NVME_SC_DNR; 477 goto out; 478 } 479 480 id = kzalloc(sizeof(*id), GFP_KERNEL); 481 if (!id) { 482 status = NVME_SC_INTERNAL; 483 goto out; 484 } 485 486 /* return an all zeroed buffer if we can't find an active namespace */ 487 status = nvmet_req_find_ns(req); 488 if (status) { 489 status = 0; 490 goto done; 491 } 492 493 nvmet_ns_revalidate(req->ns); 494 495 /* 496 * nuse = ncap = nsze isn't always true, but we have no way to find 497 * that out from the underlying device. 498 */ 499 id->ncap = id->nsze = 500 cpu_to_le64(req->ns->size >> req->ns->blksize_shift); 501 switch (req->port->ana_state[req->ns->anagrpid]) { 502 case NVME_ANA_INACCESSIBLE: 503 case NVME_ANA_PERSISTENT_LOSS: 504 break; 505 default: 506 id->nuse = id->nsze; 507 break; 508 } 509 510 if (req->ns->bdev) 511 nvmet_bdev_set_limits(req->ns->bdev, id); 512 513 /* 514 * We just provide a single LBA format that matches what the 515 * underlying device reports. 516 */ 517 id->nlbaf = 0; 518 id->flbas = 0; 519 520 /* 521 * Our namespace might always be shared. Not just with other 522 * controllers, but also with any other user of the block device. 523 */ 524 id->nmic = (1 << 0); 525 id->anagrpid = cpu_to_le32(req->ns->anagrpid); 526 527 memcpy(&id->nguid, &req->ns->nguid, sizeof(id->nguid)); 528 529 id->lbaf[0].ds = req->ns->blksize_shift; 530 531 if (req->sq->ctrl->pi_support && nvmet_ns_has_pi(req->ns)) { 532 id->dpc = NVME_NS_DPC_PI_FIRST | NVME_NS_DPC_PI_LAST | 533 NVME_NS_DPC_PI_TYPE1 | NVME_NS_DPC_PI_TYPE2 | 534 NVME_NS_DPC_PI_TYPE3; 535 id->mc = NVME_MC_EXTENDED_LBA; 536 id->dps = req->ns->pi_type; 537 id->flbas = NVME_NS_FLBAS_META_EXT; 538 id->lbaf[0].ms = cpu_to_le16(req->ns->metadata_size); 539 } 540 541 if (req->ns->readonly) 542 id->nsattr |= (1 << 0); 543 done: 544 if (!status) 545 status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id)); 546 547 kfree(id); 548 out: 549 nvmet_req_complete(req, status); 550 } 551 552 static void nvmet_execute_identify_nslist(struct nvmet_req *req) 553 { 554 static const int buf_size = NVME_IDENTIFY_DATA_SIZE; 555 struct nvmet_ctrl *ctrl = req->sq->ctrl; 556 struct nvmet_ns *ns; 557 unsigned long idx; 558 u32 min_nsid = le32_to_cpu(req->cmd->identify.nsid); 559 __le32 *list; 560 u16 status = 0; 561 int i = 0; 562 563 list = kzalloc(buf_size, GFP_KERNEL); 564 if (!list) { 565 status = NVME_SC_INTERNAL; 566 goto out; 567 } 568 569 xa_for_each(&ctrl->subsys->namespaces, idx, ns) { 570 if (ns->nsid <= min_nsid) 571 continue; 572 list[i++] = cpu_to_le32(ns->nsid); 573 if (i == buf_size / sizeof(__le32)) 574 break; 575 } 576 577 status = nvmet_copy_to_sgl(req, 0, list, buf_size); 578 579 kfree(list); 580 out: 581 nvmet_req_complete(req, status); 582 } 583 584 static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len, 585 void *id, off_t *off) 586 { 587 struct nvme_ns_id_desc desc = { 588 .nidt = type, 589 .nidl = len, 590 }; 591 u16 status; 592 593 status = nvmet_copy_to_sgl(req, *off, &desc, sizeof(desc)); 594 if (status) 595 return status; 596 *off += sizeof(desc); 597 598 status = nvmet_copy_to_sgl(req, *off, id, len); 599 if (status) 600 return status; 601 *off += len; 602 603 return 0; 604 } 605 606 static void nvmet_execute_identify_desclist(struct nvmet_req *req) 607 { 608 off_t off = 0; 609 u16 status; 610 611 status = nvmet_req_find_ns(req); 612 if (status) 613 goto out; 614 615 if (memchr_inv(&req->ns->uuid, 0, sizeof(req->ns->uuid))) { 616 status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID, 617 NVME_NIDT_UUID_LEN, 618 &req->ns->uuid, &off); 619 if (status) 620 goto out; 621 } 622 if (memchr_inv(req->ns->nguid, 0, sizeof(req->ns->nguid))) { 623 status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID, 624 NVME_NIDT_NGUID_LEN, 625 &req->ns->nguid, &off); 626 if (status) 627 goto out; 628 } 629 630 status = nvmet_copy_ns_identifier(req, NVME_NIDT_CSI, 631 NVME_NIDT_CSI_LEN, 632 &req->ns->csi, &off); 633 if (status) 634 goto out; 635 636 if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off, 637 off) != NVME_IDENTIFY_DATA_SIZE - off) 638 status = NVME_SC_INTERNAL | NVME_SC_DNR; 639 640 out: 641 nvmet_req_complete(req, status); 642 } 643 644 static bool nvmet_handle_identify_desclist(struct nvmet_req *req) 645 { 646 switch (req->cmd->identify.csi) { 647 case NVME_CSI_NVM: 648 nvmet_execute_identify_desclist(req); 649 return true; 650 default: 651 return false; 652 } 653 } 654 655 static void nvmet_execute_identify(struct nvmet_req *req) 656 { 657 if (!nvmet_check_transfer_len(req, NVME_IDENTIFY_DATA_SIZE)) 658 return; 659 660 switch (req->cmd->identify.cns) { 661 case NVME_ID_CNS_NS: 662 switch (req->cmd->identify.csi) { 663 case NVME_CSI_NVM: 664 return nvmet_execute_identify_ns(req); 665 default: 666 break; 667 } 668 break; 669 case NVME_ID_CNS_CTRL: 670 switch (req->cmd->identify.csi) { 671 case NVME_CSI_NVM: 672 return nvmet_execute_identify_ctrl(req); 673 } 674 break; 675 case NVME_ID_CNS_NS_ACTIVE_LIST: 676 switch (req->cmd->identify.csi) { 677 case NVME_CSI_NVM: 678 return nvmet_execute_identify_nslist(req); 679 default: 680 break; 681 } 682 break; 683 case NVME_ID_CNS_NS_DESC_LIST: 684 if (nvmet_handle_identify_desclist(req) == true) 685 return; 686 break; 687 } 688 689 nvmet_req_cns_error_complete(req); 690 } 691 692 /* 693 * A "minimum viable" abort implementation: the command is mandatory in the 694 * spec, but we are not required to do any useful work. We couldn't really 695 * do a useful abort, so don't bother even with waiting for the command 696 * to be exectuted and return immediately telling the command to abort 697 * wasn't found. 698 */ 699 static void nvmet_execute_abort(struct nvmet_req *req) 700 { 701 if (!nvmet_check_transfer_len(req, 0)) 702 return; 703 nvmet_set_result(req, 1); 704 nvmet_req_complete(req, 0); 705 } 706 707 static u16 nvmet_write_protect_flush_sync(struct nvmet_req *req) 708 { 709 u16 status; 710 711 if (req->ns->file) 712 status = nvmet_file_flush(req); 713 else 714 status = nvmet_bdev_flush(req); 715 716 if (status) 717 pr_err("write protect flush failed nsid: %u\n", req->ns->nsid); 718 return status; 719 } 720 721 static u16 nvmet_set_feat_write_protect(struct nvmet_req *req) 722 { 723 u32 write_protect = le32_to_cpu(req->cmd->common.cdw11); 724 struct nvmet_subsys *subsys = nvmet_req_subsys(req); 725 u16 status; 726 727 status = nvmet_req_find_ns(req); 728 if (status) 729 return status; 730 731 mutex_lock(&subsys->lock); 732 switch (write_protect) { 733 case NVME_NS_WRITE_PROTECT: 734 req->ns->readonly = true; 735 status = nvmet_write_protect_flush_sync(req); 736 if (status) 737 req->ns->readonly = false; 738 break; 739 case NVME_NS_NO_WRITE_PROTECT: 740 req->ns->readonly = false; 741 status = 0; 742 break; 743 default: 744 break; 745 } 746 747 if (!status) 748 nvmet_ns_changed(subsys, req->ns->nsid); 749 mutex_unlock(&subsys->lock); 750 return status; 751 } 752 753 u16 nvmet_set_feat_kato(struct nvmet_req *req) 754 { 755 u32 val32 = le32_to_cpu(req->cmd->common.cdw11); 756 757 nvmet_stop_keep_alive_timer(req->sq->ctrl); 758 req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000); 759 nvmet_start_keep_alive_timer(req->sq->ctrl); 760 761 nvmet_set_result(req, req->sq->ctrl->kato); 762 763 return 0; 764 } 765 766 u16 nvmet_set_feat_async_event(struct nvmet_req *req, u32 mask) 767 { 768 u32 val32 = le32_to_cpu(req->cmd->common.cdw11); 769 770 if (val32 & ~mask) { 771 req->error_loc = offsetof(struct nvme_common_command, cdw11); 772 return NVME_SC_INVALID_FIELD | NVME_SC_DNR; 773 } 774 775 WRITE_ONCE(req->sq->ctrl->aen_enabled, val32); 776 nvmet_set_result(req, val32); 777 778 return 0; 779 } 780 781 void nvmet_execute_set_features(struct nvmet_req *req) 782 { 783 struct nvmet_subsys *subsys = nvmet_req_subsys(req); 784 u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10); 785 u32 cdw11 = le32_to_cpu(req->cmd->common.cdw11); 786 u16 status = 0; 787 u16 nsqr; 788 u16 ncqr; 789 790 if (!nvmet_check_transfer_len(req, 0)) 791 return; 792 793 switch (cdw10 & 0xff) { 794 case NVME_FEAT_NUM_QUEUES: 795 ncqr = (cdw11 >> 16) & 0xffff; 796 nsqr = cdw11 & 0xffff; 797 if (ncqr == 0xffff || nsqr == 0xffff) { 798 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; 799 break; 800 } 801 nvmet_set_result(req, 802 (subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16)); 803 break; 804 case NVME_FEAT_KATO: 805 status = nvmet_set_feat_kato(req); 806 break; 807 case NVME_FEAT_ASYNC_EVENT: 808 status = nvmet_set_feat_async_event(req, NVMET_AEN_CFG_ALL); 809 break; 810 case NVME_FEAT_HOST_ID: 811 status = NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; 812 break; 813 case NVME_FEAT_WRITE_PROTECT: 814 status = nvmet_set_feat_write_protect(req); 815 break; 816 default: 817 req->error_loc = offsetof(struct nvme_common_command, cdw10); 818 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; 819 break; 820 } 821 822 nvmet_req_complete(req, status); 823 } 824 825 static u16 nvmet_get_feat_write_protect(struct nvmet_req *req) 826 { 827 struct nvmet_subsys *subsys = nvmet_req_subsys(req); 828 u32 result; 829 830 result = nvmet_req_find_ns(req); 831 if (result) 832 return result; 833 834 mutex_lock(&subsys->lock); 835 if (req->ns->readonly == true) 836 result = NVME_NS_WRITE_PROTECT; 837 else 838 result = NVME_NS_NO_WRITE_PROTECT; 839 nvmet_set_result(req, result); 840 mutex_unlock(&subsys->lock); 841 842 return 0; 843 } 844 845 void nvmet_get_feat_kato(struct nvmet_req *req) 846 { 847 nvmet_set_result(req, req->sq->ctrl->kato * 1000); 848 } 849 850 void nvmet_get_feat_async_event(struct nvmet_req *req) 851 { 852 nvmet_set_result(req, READ_ONCE(req->sq->ctrl->aen_enabled)); 853 } 854 855 void nvmet_execute_get_features(struct nvmet_req *req) 856 { 857 struct nvmet_subsys *subsys = nvmet_req_subsys(req); 858 u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10); 859 u16 status = 0; 860 861 if (!nvmet_check_transfer_len(req, nvmet_feat_data_len(req, cdw10))) 862 return; 863 864 switch (cdw10 & 0xff) { 865 /* 866 * These features are mandatory in the spec, but we don't 867 * have a useful way to implement them. We'll eventually 868 * need to come up with some fake values for these. 869 */ 870 #if 0 871 case NVME_FEAT_ARBITRATION: 872 break; 873 case NVME_FEAT_POWER_MGMT: 874 break; 875 case NVME_FEAT_TEMP_THRESH: 876 break; 877 case NVME_FEAT_ERR_RECOVERY: 878 break; 879 case NVME_FEAT_IRQ_COALESCE: 880 break; 881 case NVME_FEAT_IRQ_CONFIG: 882 break; 883 case NVME_FEAT_WRITE_ATOMIC: 884 break; 885 #endif 886 case NVME_FEAT_ASYNC_EVENT: 887 nvmet_get_feat_async_event(req); 888 break; 889 case NVME_FEAT_VOLATILE_WC: 890 nvmet_set_result(req, 1); 891 break; 892 case NVME_FEAT_NUM_QUEUES: 893 nvmet_set_result(req, 894 (subsys->max_qid-1) | ((subsys->max_qid-1) << 16)); 895 break; 896 case NVME_FEAT_KATO: 897 nvmet_get_feat_kato(req); 898 break; 899 case NVME_FEAT_HOST_ID: 900 /* need 128-bit host identifier flag */ 901 if (!(req->cmd->common.cdw11 & cpu_to_le32(1 << 0))) { 902 req->error_loc = 903 offsetof(struct nvme_common_command, cdw11); 904 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; 905 break; 906 } 907 908 status = nvmet_copy_to_sgl(req, 0, &req->sq->ctrl->hostid, 909 sizeof(req->sq->ctrl->hostid)); 910 break; 911 case NVME_FEAT_WRITE_PROTECT: 912 status = nvmet_get_feat_write_protect(req); 913 break; 914 default: 915 req->error_loc = 916 offsetof(struct nvme_common_command, cdw10); 917 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; 918 break; 919 } 920 921 nvmet_req_complete(req, status); 922 } 923 924 void nvmet_execute_async_event(struct nvmet_req *req) 925 { 926 struct nvmet_ctrl *ctrl = req->sq->ctrl; 927 928 if (!nvmet_check_transfer_len(req, 0)) 929 return; 930 931 mutex_lock(&ctrl->lock); 932 if (ctrl->nr_async_event_cmds >= NVMET_ASYNC_EVENTS) { 933 mutex_unlock(&ctrl->lock); 934 nvmet_req_complete(req, NVME_SC_ASYNC_LIMIT | NVME_SC_DNR); 935 return; 936 } 937 ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req; 938 mutex_unlock(&ctrl->lock); 939 940 schedule_work(&ctrl->async_event_work); 941 } 942 943 void nvmet_execute_keep_alive(struct nvmet_req *req) 944 { 945 struct nvmet_ctrl *ctrl = req->sq->ctrl; 946 u16 status = 0; 947 948 if (!nvmet_check_transfer_len(req, 0)) 949 return; 950 951 if (!ctrl->kato) { 952 status = NVME_SC_KA_TIMEOUT_INVALID; 953 goto out; 954 } 955 956 pr_debug("ctrl %d update keep-alive timer for %d secs\n", 957 ctrl->cntlid, ctrl->kato); 958 mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ); 959 out: 960 nvmet_req_complete(req, status); 961 } 962 963 u16 nvmet_parse_admin_cmd(struct nvmet_req *req) 964 { 965 struct nvme_command *cmd = req->cmd; 966 u16 ret; 967 968 if (nvme_is_fabrics(cmd)) 969 return nvmet_parse_fabrics_cmd(req); 970 if (nvmet_req_subsys(req)->type == NVME_NQN_DISC) 971 return nvmet_parse_discovery_cmd(req); 972 973 ret = nvmet_check_ctrl_status(req); 974 if (unlikely(ret)) 975 return ret; 976 977 if (nvmet_req_passthru_ctrl(req)) 978 return nvmet_parse_passthru_admin_cmd(req); 979 980 switch (cmd->common.opcode) { 981 case nvme_admin_get_log_page: 982 req->execute = nvmet_execute_get_log_page; 983 return 0; 984 case nvme_admin_identify: 985 req->execute = nvmet_execute_identify; 986 return 0; 987 case nvme_admin_abort_cmd: 988 req->execute = nvmet_execute_abort; 989 return 0; 990 case nvme_admin_set_features: 991 req->execute = nvmet_execute_set_features; 992 return 0; 993 case nvme_admin_get_features: 994 req->execute = nvmet_execute_get_features; 995 return 0; 996 case nvme_admin_async_event: 997 req->execute = nvmet_execute_async_event; 998 return 0; 999 case nvme_admin_keep_alive: 1000 req->execute = nvmet_execute_keep_alive; 1001 return 0; 1002 default: 1003 return nvmet_report_invalid_opcode(req); 1004 } 1005 } 1006