1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NVMe over Fabrics loopback device. 4 * Copyright (c) 2015-2016 HGST, a Western Digital Company. 5 */ 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 #include <linux/scatterlist.h> 8 #include <linux/blk-mq.h> 9 #include <linux/nvme.h> 10 #include <linux/module.h> 11 #include <linux/parser.h> 12 #include "nvmet.h" 13 #include "../host/nvme.h" 14 #include "../host/fabrics.h" 15 16 #define NVME_LOOP_MAX_SEGMENTS 256 17 18 struct nvme_loop_iod { 19 struct nvme_request nvme_req; 20 struct nvme_command cmd; 21 struct nvme_completion rsp; 22 struct nvmet_req req; 23 struct nvme_loop_queue *queue; 24 struct work_struct work; 25 struct sg_table sg_table; 26 struct scatterlist first_sgl[]; 27 }; 28 29 struct nvme_loop_ctrl { 30 struct nvme_loop_queue *queues; 31 32 struct blk_mq_tag_set admin_tag_set; 33 34 struct list_head list; 35 struct blk_mq_tag_set tag_set; 36 struct nvme_loop_iod async_event_iod; 37 struct nvme_ctrl ctrl; 38 39 struct nvmet_ctrl *target_ctrl; 40 struct nvmet_port *port; 41 }; 42 43 static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) 44 { 45 return container_of(ctrl, struct nvme_loop_ctrl, ctrl); 46 } 47 48 enum nvme_loop_queue_flags { 49 NVME_LOOP_Q_LIVE = 0, 50 }; 51 52 struct nvme_loop_queue { 53 struct nvmet_cq nvme_cq; 54 struct nvmet_sq nvme_sq; 55 struct nvme_loop_ctrl *ctrl; 56 unsigned long flags; 57 }; 58 59 static LIST_HEAD(nvme_loop_ports); 60 static DEFINE_MUTEX(nvme_loop_ports_mutex); 61 62 static LIST_HEAD(nvme_loop_ctrl_list); 63 static DEFINE_MUTEX(nvme_loop_ctrl_mutex); 64 65 static void nvme_loop_queue_response(struct nvmet_req *nvme_req); 66 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); 67 68 static const struct nvmet_fabrics_ops nvme_loop_ops; 69 70 static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) 71 { 72 return queue - queue->ctrl->queues; 73 } 74 75 static void nvme_loop_complete_rq(struct request *req) 76 { 77 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 78 79 nvme_cleanup_cmd(req); 80 sg_free_table_chained(&iod->sg_table, true); 81 nvme_complete_rq(req); 82 } 83 84 static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) 85 { 86 u32 queue_idx = nvme_loop_queue_idx(queue); 87 88 if (queue_idx == 0) 89 return queue->ctrl->admin_tag_set.tags[queue_idx]; 90 return queue->ctrl->tag_set.tags[queue_idx - 1]; 91 } 92 93 static void nvme_loop_queue_response(struct nvmet_req *req) 94 { 95 struct nvme_loop_queue *queue = 96 container_of(req->sq, struct nvme_loop_queue, nvme_sq); 97 struct nvme_completion *cqe = req->rsp; 98 99 /* 100 * AEN requests are special as they don't time out and can 101 * survive any kind of queue freeze and often don't respond to 102 * aborts. We don't even bother to allocate a struct request 103 * for them but rather special case them here. 104 */ 105 if (unlikely(nvme_loop_queue_idx(queue) == 0 && 106 cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { 107 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, 108 &cqe->result); 109 } else { 110 struct request *rq; 111 112 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); 113 if (!rq) { 114 dev_err(queue->ctrl->ctrl.device, 115 "tag 0x%x on queue %d not found\n", 116 cqe->command_id, nvme_loop_queue_idx(queue)); 117 return; 118 } 119 120 nvme_end_request(rq, cqe->status, cqe->result); 121 } 122 } 123 124 static void nvme_loop_execute_work(struct work_struct *work) 125 { 126 struct nvme_loop_iod *iod = 127 container_of(work, struct nvme_loop_iod, work); 128 129 nvmet_req_execute(&iod->req); 130 } 131 132 static enum blk_eh_timer_return 133 nvme_loop_timeout(struct request *rq, bool reserved) 134 { 135 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq); 136 137 /* queue error recovery */ 138 nvme_reset_ctrl(&iod->queue->ctrl->ctrl); 139 140 /* fail with DNR on admin cmd timeout */ 141 nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR; 142 143 return BLK_EH_DONE; 144 } 145 146 static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, 147 const struct blk_mq_queue_data *bd) 148 { 149 struct nvme_ns *ns = hctx->queue->queuedata; 150 struct nvme_loop_queue *queue = hctx->driver_data; 151 struct request *req = bd->rq; 152 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 153 bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags); 154 blk_status_t ret; 155 156 if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready)) 157 return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req); 158 159 ret = nvme_setup_cmd(ns, req, &iod->cmd); 160 if (ret) 161 return ret; 162 163 blk_mq_start_request(req); 164 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 165 iod->req.port = queue->ctrl->port; 166 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, 167 &queue->nvme_sq, &nvme_loop_ops)) 168 return BLK_STS_OK; 169 170 if (blk_rq_nr_phys_segments(req)) { 171 iod->sg_table.sgl = iod->first_sgl; 172 if (sg_alloc_table_chained(&iod->sg_table, 173 blk_rq_nr_phys_segments(req), 174 iod->sg_table.sgl)) 175 return BLK_STS_RESOURCE; 176 177 iod->req.sg = iod->sg_table.sgl; 178 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); 179 iod->req.transfer_len = blk_rq_payload_bytes(req); 180 } 181 182 schedule_work(&iod->work); 183 return BLK_STS_OK; 184 } 185 186 static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) 187 { 188 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); 189 struct nvme_loop_queue *queue = &ctrl->queues[0]; 190 struct nvme_loop_iod *iod = &ctrl->async_event_iod; 191 192 memset(&iod->cmd, 0, sizeof(iod->cmd)); 193 iod->cmd.common.opcode = nvme_admin_async_event; 194 iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; 195 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 196 197 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, 198 &nvme_loop_ops)) { 199 dev_err(ctrl->ctrl.device, "failed async event work\n"); 200 return; 201 } 202 203 schedule_work(&iod->work); 204 } 205 206 static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, 207 struct nvme_loop_iod *iod, unsigned int queue_idx) 208 { 209 iod->req.cmd = &iod->cmd; 210 iod->req.rsp = &iod->rsp; 211 iod->queue = &ctrl->queues[queue_idx]; 212 INIT_WORK(&iod->work, nvme_loop_execute_work); 213 return 0; 214 } 215 216 static int nvme_loop_init_request(struct blk_mq_tag_set *set, 217 struct request *req, unsigned int hctx_idx, 218 unsigned int numa_node) 219 { 220 struct nvme_loop_ctrl *ctrl = set->driver_data; 221 222 nvme_req(req)->ctrl = &ctrl->ctrl; 223 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), 224 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); 225 } 226 227 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 228 unsigned int hctx_idx) 229 { 230 struct nvme_loop_ctrl *ctrl = data; 231 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; 232 233 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); 234 235 hctx->driver_data = queue; 236 return 0; 237 } 238 239 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, 240 unsigned int hctx_idx) 241 { 242 struct nvme_loop_ctrl *ctrl = data; 243 struct nvme_loop_queue *queue = &ctrl->queues[0]; 244 245 BUG_ON(hctx_idx != 0); 246 247 hctx->driver_data = queue; 248 return 0; 249 } 250 251 static const struct blk_mq_ops nvme_loop_mq_ops = { 252 .queue_rq = nvme_loop_queue_rq, 253 .complete = nvme_loop_complete_rq, 254 .init_request = nvme_loop_init_request, 255 .init_hctx = nvme_loop_init_hctx, 256 .timeout = nvme_loop_timeout, 257 }; 258 259 static const struct blk_mq_ops nvme_loop_admin_mq_ops = { 260 .queue_rq = nvme_loop_queue_rq, 261 .complete = nvme_loop_complete_rq, 262 .init_request = nvme_loop_init_request, 263 .init_hctx = nvme_loop_init_admin_hctx, 264 .timeout = nvme_loop_timeout, 265 }; 266 267 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) 268 { 269 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 270 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 271 blk_cleanup_queue(ctrl->ctrl.admin_q); 272 blk_mq_free_tag_set(&ctrl->admin_tag_set); 273 } 274 275 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) 276 { 277 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); 278 279 if (list_empty(&ctrl->list)) 280 goto free_ctrl; 281 282 mutex_lock(&nvme_loop_ctrl_mutex); 283 list_del(&ctrl->list); 284 mutex_unlock(&nvme_loop_ctrl_mutex); 285 286 if (nctrl->tagset) { 287 blk_cleanup_queue(ctrl->ctrl.connect_q); 288 blk_mq_free_tag_set(&ctrl->tag_set); 289 } 290 kfree(ctrl->queues); 291 nvmf_free_options(nctrl->opts); 292 free_ctrl: 293 kfree(ctrl); 294 } 295 296 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) 297 { 298 int i; 299 300 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 301 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 302 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); 303 } 304 } 305 306 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) 307 { 308 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; 309 unsigned int nr_io_queues; 310 int ret, i; 311 312 nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); 313 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); 314 if (ret || !nr_io_queues) 315 return ret; 316 317 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); 318 319 for (i = 1; i <= nr_io_queues; i++) { 320 ctrl->queues[i].ctrl = ctrl; 321 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); 322 if (ret) 323 goto out_destroy_queues; 324 325 ctrl->ctrl.queue_count++; 326 } 327 328 return 0; 329 330 out_destroy_queues: 331 nvme_loop_destroy_io_queues(ctrl); 332 return ret; 333 } 334 335 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) 336 { 337 int i, ret; 338 339 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 340 ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false); 341 if (ret) 342 return ret; 343 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 344 } 345 346 return 0; 347 } 348 349 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) 350 { 351 int error; 352 353 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); 354 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; 355 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 356 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ 357 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; 358 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 359 SG_CHUNK_SIZE * sizeof(struct scatterlist); 360 ctrl->admin_tag_set.driver_data = ctrl; 361 ctrl->admin_tag_set.nr_hw_queues = 1; 362 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; 363 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; 364 365 ctrl->queues[0].ctrl = ctrl; 366 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); 367 if (error) 368 return error; 369 ctrl->ctrl.queue_count = 1; 370 371 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); 372 if (error) 373 goto out_free_sq; 374 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; 375 376 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); 377 if (IS_ERR(ctrl->ctrl.admin_q)) { 378 error = PTR_ERR(ctrl->ctrl.admin_q); 379 goto out_free_tagset; 380 } 381 382 error = nvmf_connect_admin_queue(&ctrl->ctrl); 383 if (error) 384 goto out_cleanup_queue; 385 386 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 387 388 error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); 389 if (error) { 390 dev_err(ctrl->ctrl.device, 391 "prop_get NVME_REG_CAP failed\n"); 392 goto out_cleanup_queue; 393 } 394 395 ctrl->ctrl.sqsize = 396 min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); 397 398 error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); 399 if (error) 400 goto out_cleanup_queue; 401 402 ctrl->ctrl.max_hw_sectors = 403 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); 404 405 error = nvme_init_identify(&ctrl->ctrl); 406 if (error) 407 goto out_cleanup_queue; 408 409 return 0; 410 411 out_cleanup_queue: 412 blk_cleanup_queue(ctrl->ctrl.admin_q); 413 out_free_tagset: 414 blk_mq_free_tag_set(&ctrl->admin_tag_set); 415 out_free_sq: 416 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 417 return error; 418 } 419 420 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) 421 { 422 if (ctrl->ctrl.queue_count > 1) { 423 nvme_stop_queues(&ctrl->ctrl); 424 blk_mq_tagset_busy_iter(&ctrl->tag_set, 425 nvme_cancel_request, &ctrl->ctrl); 426 nvme_loop_destroy_io_queues(ctrl); 427 } 428 429 if (ctrl->ctrl.state == NVME_CTRL_LIVE) 430 nvme_shutdown_ctrl(&ctrl->ctrl); 431 432 blk_mq_quiesce_queue(ctrl->ctrl.admin_q); 433 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, 434 nvme_cancel_request, &ctrl->ctrl); 435 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); 436 nvme_loop_destroy_admin_queue(ctrl); 437 } 438 439 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) 440 { 441 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); 442 } 443 444 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) 445 { 446 struct nvme_loop_ctrl *ctrl; 447 448 mutex_lock(&nvme_loop_ctrl_mutex); 449 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { 450 if (ctrl->ctrl.cntlid == nctrl->cntlid) 451 nvme_delete_ctrl(&ctrl->ctrl); 452 } 453 mutex_unlock(&nvme_loop_ctrl_mutex); 454 } 455 456 static void nvme_loop_reset_ctrl_work(struct work_struct *work) 457 { 458 struct nvme_loop_ctrl *ctrl = 459 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); 460 bool changed; 461 int ret; 462 463 nvme_stop_ctrl(&ctrl->ctrl); 464 nvme_loop_shutdown_ctrl(ctrl); 465 466 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { 467 /* state change failure should never happen */ 468 WARN_ON_ONCE(1); 469 return; 470 } 471 472 ret = nvme_loop_configure_admin_queue(ctrl); 473 if (ret) 474 goto out_disable; 475 476 ret = nvme_loop_init_io_queues(ctrl); 477 if (ret) 478 goto out_destroy_admin; 479 480 ret = nvme_loop_connect_io_queues(ctrl); 481 if (ret) 482 goto out_destroy_io; 483 484 blk_mq_update_nr_hw_queues(&ctrl->tag_set, 485 ctrl->ctrl.queue_count - 1); 486 487 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 488 WARN_ON_ONCE(!changed); 489 490 nvme_start_ctrl(&ctrl->ctrl); 491 492 return; 493 494 out_destroy_io: 495 nvme_loop_destroy_io_queues(ctrl); 496 out_destroy_admin: 497 nvme_loop_destroy_admin_queue(ctrl); 498 out_disable: 499 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); 500 nvme_uninit_ctrl(&ctrl->ctrl); 501 nvme_put_ctrl(&ctrl->ctrl); 502 } 503 504 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { 505 .name = "loop", 506 .module = THIS_MODULE, 507 .flags = NVME_F_FABRICS, 508 .reg_read32 = nvmf_reg_read32, 509 .reg_read64 = nvmf_reg_read64, 510 .reg_write32 = nvmf_reg_write32, 511 .free_ctrl = nvme_loop_free_ctrl, 512 .submit_async_event = nvme_loop_submit_async_event, 513 .delete_ctrl = nvme_loop_delete_ctrl_host, 514 .get_address = nvmf_get_address, 515 }; 516 517 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) 518 { 519 int ret; 520 521 ret = nvme_loop_init_io_queues(ctrl); 522 if (ret) 523 return ret; 524 525 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); 526 ctrl->tag_set.ops = &nvme_loop_mq_ops; 527 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; 528 ctrl->tag_set.reserved_tags = 1; /* fabric connect */ 529 ctrl->tag_set.numa_node = NUMA_NO_NODE; 530 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 531 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 532 SG_CHUNK_SIZE * sizeof(struct scatterlist); 533 ctrl->tag_set.driver_data = ctrl; 534 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; 535 ctrl->tag_set.timeout = NVME_IO_TIMEOUT; 536 ctrl->ctrl.tagset = &ctrl->tag_set; 537 538 ret = blk_mq_alloc_tag_set(&ctrl->tag_set); 539 if (ret) 540 goto out_destroy_queues; 541 542 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); 543 if (IS_ERR(ctrl->ctrl.connect_q)) { 544 ret = PTR_ERR(ctrl->ctrl.connect_q); 545 goto out_free_tagset; 546 } 547 548 ret = nvme_loop_connect_io_queues(ctrl); 549 if (ret) 550 goto out_cleanup_connect_q; 551 552 return 0; 553 554 out_cleanup_connect_q: 555 blk_cleanup_queue(ctrl->ctrl.connect_q); 556 out_free_tagset: 557 blk_mq_free_tag_set(&ctrl->tag_set); 558 out_destroy_queues: 559 nvme_loop_destroy_io_queues(ctrl); 560 return ret; 561 } 562 563 static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) 564 { 565 struct nvmet_port *p, *found = NULL; 566 567 mutex_lock(&nvme_loop_ports_mutex); 568 list_for_each_entry(p, &nvme_loop_ports, entry) { 569 /* if no transport address is specified use the first port */ 570 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && 571 strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) 572 continue; 573 found = p; 574 break; 575 } 576 mutex_unlock(&nvme_loop_ports_mutex); 577 return found; 578 } 579 580 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 581 struct nvmf_ctrl_options *opts) 582 { 583 struct nvme_loop_ctrl *ctrl; 584 bool changed; 585 int ret; 586 587 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 588 if (!ctrl) 589 return ERR_PTR(-ENOMEM); 590 ctrl->ctrl.opts = opts; 591 INIT_LIST_HEAD(&ctrl->list); 592 593 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); 594 595 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, 596 0 /* no quirks, we're perfect! */); 597 if (ret) 598 goto out_put_ctrl; 599 600 ret = -ENOMEM; 601 602 ctrl->ctrl.sqsize = opts->queue_size - 1; 603 ctrl->ctrl.kato = opts->kato; 604 ctrl->port = nvme_loop_find_port(&ctrl->ctrl); 605 606 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), 607 GFP_KERNEL); 608 if (!ctrl->queues) 609 goto out_uninit_ctrl; 610 611 ret = nvme_loop_configure_admin_queue(ctrl); 612 if (ret) 613 goto out_free_queues; 614 615 if (opts->queue_size > ctrl->ctrl.maxcmd) { 616 /* warn if maxcmd is lower than queue_size */ 617 dev_warn(ctrl->ctrl.device, 618 "queue_size %zu > ctrl maxcmd %u, clamping down\n", 619 opts->queue_size, ctrl->ctrl.maxcmd); 620 opts->queue_size = ctrl->ctrl.maxcmd; 621 } 622 623 if (opts->nr_io_queues) { 624 ret = nvme_loop_create_io_queues(ctrl); 625 if (ret) 626 goto out_remove_admin_queue; 627 } 628 629 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); 630 631 dev_info(ctrl->ctrl.device, 632 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); 633 634 nvme_get_ctrl(&ctrl->ctrl); 635 636 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 637 WARN_ON_ONCE(!changed); 638 639 mutex_lock(&nvme_loop_ctrl_mutex); 640 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); 641 mutex_unlock(&nvme_loop_ctrl_mutex); 642 643 nvme_start_ctrl(&ctrl->ctrl); 644 645 return &ctrl->ctrl; 646 647 out_remove_admin_queue: 648 nvme_loop_destroy_admin_queue(ctrl); 649 out_free_queues: 650 kfree(ctrl->queues); 651 out_uninit_ctrl: 652 nvme_uninit_ctrl(&ctrl->ctrl); 653 out_put_ctrl: 654 nvme_put_ctrl(&ctrl->ctrl); 655 if (ret > 0) 656 ret = -EIO; 657 return ERR_PTR(ret); 658 } 659 660 static int nvme_loop_add_port(struct nvmet_port *port) 661 { 662 mutex_lock(&nvme_loop_ports_mutex); 663 list_add_tail(&port->entry, &nvme_loop_ports); 664 mutex_unlock(&nvme_loop_ports_mutex); 665 return 0; 666 } 667 668 static void nvme_loop_remove_port(struct nvmet_port *port) 669 { 670 mutex_lock(&nvme_loop_ports_mutex); 671 list_del_init(&port->entry); 672 mutex_unlock(&nvme_loop_ports_mutex); 673 } 674 675 static const struct nvmet_fabrics_ops nvme_loop_ops = { 676 .owner = THIS_MODULE, 677 .type = NVMF_TRTYPE_LOOP, 678 .add_port = nvme_loop_add_port, 679 .remove_port = nvme_loop_remove_port, 680 .queue_response = nvme_loop_queue_response, 681 .delete_ctrl = nvme_loop_delete_ctrl, 682 }; 683 684 static struct nvmf_transport_ops nvme_loop_transport = { 685 .name = "loop", 686 .module = THIS_MODULE, 687 .create_ctrl = nvme_loop_create_ctrl, 688 .allowed_opts = NVMF_OPT_TRADDR, 689 }; 690 691 static int __init nvme_loop_init_module(void) 692 { 693 int ret; 694 695 ret = nvmet_register_transport(&nvme_loop_ops); 696 if (ret) 697 return ret; 698 699 ret = nvmf_register_transport(&nvme_loop_transport); 700 if (ret) 701 nvmet_unregister_transport(&nvme_loop_ops); 702 703 return ret; 704 } 705 706 static void __exit nvme_loop_cleanup_module(void) 707 { 708 struct nvme_loop_ctrl *ctrl, *next; 709 710 nvmf_unregister_transport(&nvme_loop_transport); 711 nvmet_unregister_transport(&nvme_loop_ops); 712 713 mutex_lock(&nvme_loop_ctrl_mutex); 714 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) 715 nvme_delete_ctrl(&ctrl->ctrl); 716 mutex_unlock(&nvme_loop_ctrl_mutex); 717 718 flush_workqueue(nvme_delete_wq); 719 } 720 721 module_init(nvme_loop_init_module); 722 module_exit(nvme_loop_cleanup_module); 723 724 MODULE_LICENSE("GPL v2"); 725 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ 726