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 cqe; 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_port *port; 40 }; 41 42 static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) 43 { 44 return container_of(ctrl, struct nvme_loop_ctrl, ctrl); 45 } 46 47 enum nvme_loop_queue_flags { 48 NVME_LOOP_Q_LIVE = 0, 49 }; 50 51 struct nvme_loop_queue { 52 struct nvmet_cq nvme_cq; 53 struct nvmet_sq nvme_sq; 54 struct nvme_loop_ctrl *ctrl; 55 unsigned long flags; 56 }; 57 58 static LIST_HEAD(nvme_loop_ports); 59 static DEFINE_MUTEX(nvme_loop_ports_mutex); 60 61 static LIST_HEAD(nvme_loop_ctrl_list); 62 static DEFINE_MUTEX(nvme_loop_ctrl_mutex); 63 64 static void nvme_loop_queue_response(struct nvmet_req *nvme_req); 65 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); 66 67 static const struct nvmet_fabrics_ops nvme_loop_ops; 68 69 static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) 70 { 71 return queue - queue->ctrl->queues; 72 } 73 74 static void nvme_loop_complete_rq(struct request *req) 75 { 76 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 77 78 sg_free_table_chained(&iod->sg_table, NVME_INLINE_SG_CNT); 79 nvme_complete_rq(req); 80 } 81 82 static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) 83 { 84 u32 queue_idx = nvme_loop_queue_idx(queue); 85 86 if (queue_idx == 0) 87 return queue->ctrl->admin_tag_set.tags[queue_idx]; 88 return queue->ctrl->tag_set.tags[queue_idx - 1]; 89 } 90 91 static void nvme_loop_queue_response(struct nvmet_req *req) 92 { 93 struct nvme_loop_queue *queue = 94 container_of(req->sq, struct nvme_loop_queue, nvme_sq); 95 struct nvme_completion *cqe = req->cqe; 96 97 /* 98 * AEN requests are special as they don't time out and can 99 * survive any kind of queue freeze and often don't respond to 100 * aborts. We don't even bother to allocate a struct request 101 * for them but rather special case them here. 102 */ 103 if (unlikely(nvme_is_aen_req(nvme_loop_queue_idx(queue), 104 cqe->command_id))) { 105 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, 106 &cqe->result); 107 } else { 108 struct request *rq; 109 110 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); 111 if (!rq) { 112 dev_err(queue->ctrl->ctrl.device, 113 "tag 0x%x on queue %d not found\n", 114 cqe->command_id, nvme_loop_queue_idx(queue)); 115 return; 116 } 117 118 if (!nvme_try_complete_req(rq, cqe->status, cqe->result)) 119 nvme_loop_complete_rq(rq); 120 } 121 } 122 123 static void nvme_loop_execute_work(struct work_struct *work) 124 { 125 struct nvme_loop_iod *iod = 126 container_of(work, struct nvme_loop_iod, work); 127 128 iod->req.execute(&iod->req); 129 } 130 131 static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, 132 const struct blk_mq_queue_data *bd) 133 { 134 struct nvme_ns *ns = hctx->queue->queuedata; 135 struct nvme_loop_queue *queue = hctx->driver_data; 136 struct request *req = bd->rq; 137 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 138 bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags); 139 blk_status_t ret; 140 141 if (!nvme_check_ready(&queue->ctrl->ctrl, req, queue_ready)) 142 return nvme_fail_nonready_command(&queue->ctrl->ctrl, req); 143 144 ret = nvme_setup_cmd(ns, req); 145 if (ret) 146 return ret; 147 148 blk_mq_start_request(req); 149 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 150 iod->req.port = queue->ctrl->port; 151 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, 152 &queue->nvme_sq, &nvme_loop_ops)) 153 return BLK_STS_OK; 154 155 if (blk_rq_nr_phys_segments(req)) { 156 iod->sg_table.sgl = iod->first_sgl; 157 if (sg_alloc_table_chained(&iod->sg_table, 158 blk_rq_nr_phys_segments(req), 159 iod->sg_table.sgl, NVME_INLINE_SG_CNT)) { 160 nvme_cleanup_cmd(req); 161 return BLK_STS_RESOURCE; 162 } 163 164 iod->req.sg = iod->sg_table.sgl; 165 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); 166 iod->req.transfer_len = blk_rq_payload_bytes(req); 167 } 168 169 schedule_work(&iod->work); 170 return BLK_STS_OK; 171 } 172 173 static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) 174 { 175 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); 176 struct nvme_loop_queue *queue = &ctrl->queues[0]; 177 struct nvme_loop_iod *iod = &ctrl->async_event_iod; 178 179 memset(&iod->cmd, 0, sizeof(iod->cmd)); 180 iod->cmd.common.opcode = nvme_admin_async_event; 181 iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; 182 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 183 184 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, 185 &nvme_loop_ops)) { 186 dev_err(ctrl->ctrl.device, "failed async event work\n"); 187 return; 188 } 189 190 schedule_work(&iod->work); 191 } 192 193 static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, 194 struct nvme_loop_iod *iod, unsigned int queue_idx) 195 { 196 iod->req.cmd = &iod->cmd; 197 iod->req.cqe = &iod->cqe; 198 iod->queue = &ctrl->queues[queue_idx]; 199 INIT_WORK(&iod->work, nvme_loop_execute_work); 200 return 0; 201 } 202 203 static int nvme_loop_init_request(struct blk_mq_tag_set *set, 204 struct request *req, unsigned int hctx_idx, 205 unsigned int numa_node) 206 { 207 struct nvme_loop_ctrl *ctrl = set->driver_data; 208 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 209 210 nvme_req(req)->ctrl = &ctrl->ctrl; 211 nvme_req(req)->cmd = &iod->cmd; 212 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), 213 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); 214 } 215 216 static struct lock_class_key loop_hctx_fq_lock_key; 217 218 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 219 unsigned int hctx_idx) 220 { 221 struct nvme_loop_ctrl *ctrl = data; 222 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; 223 224 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); 225 226 /* 227 * flush_end_io() can be called recursively for us, so use our own 228 * lock class key for avoiding lockdep possible recursive locking, 229 * then we can remove the dynamically allocated lock class for each 230 * flush queue, that way may cause horrible boot delay. 231 */ 232 blk_mq_hctx_set_fq_lock_class(hctx, &loop_hctx_fq_lock_key); 233 234 hctx->driver_data = queue; 235 return 0; 236 } 237 238 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, 239 unsigned int hctx_idx) 240 { 241 struct nvme_loop_ctrl *ctrl = data; 242 struct nvme_loop_queue *queue = &ctrl->queues[0]; 243 244 BUG_ON(hctx_idx != 0); 245 246 hctx->driver_data = queue; 247 return 0; 248 } 249 250 static const struct blk_mq_ops nvme_loop_mq_ops = { 251 .queue_rq = nvme_loop_queue_rq, 252 .complete = nvme_loop_complete_rq, 253 .init_request = nvme_loop_init_request, 254 .init_hctx = nvme_loop_init_hctx, 255 }; 256 257 static const struct blk_mq_ops nvme_loop_admin_mq_ops = { 258 .queue_rq = nvme_loop_queue_rq, 259 .complete = nvme_loop_complete_rq, 260 .init_request = nvme_loop_init_request, 261 .init_hctx = nvme_loop_init_admin_hctx, 262 }; 263 264 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) 265 { 266 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 267 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 268 blk_cleanup_queue(ctrl->ctrl.admin_q); 269 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 270 blk_mq_free_tag_set(&ctrl->admin_tag_set); 271 } 272 273 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) 274 { 275 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); 276 277 if (list_empty(&ctrl->list)) 278 goto free_ctrl; 279 280 mutex_lock(&nvme_loop_ctrl_mutex); 281 list_del(&ctrl->list); 282 mutex_unlock(&nvme_loop_ctrl_mutex); 283 284 if (nctrl->tagset) { 285 blk_cleanup_queue(ctrl->ctrl.connect_q); 286 blk_mq_free_tag_set(&ctrl->tag_set); 287 } 288 kfree(ctrl->queues); 289 nvmf_free_options(nctrl->opts); 290 free_ctrl: 291 kfree(ctrl); 292 } 293 294 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) 295 { 296 int i; 297 298 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 299 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 300 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); 301 } 302 } 303 304 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) 305 { 306 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; 307 unsigned int nr_io_queues; 308 int ret, i; 309 310 nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); 311 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); 312 if (ret || !nr_io_queues) 313 return ret; 314 315 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); 316 317 for (i = 1; i <= nr_io_queues; i++) { 318 ctrl->queues[i].ctrl = ctrl; 319 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); 320 if (ret) 321 goto out_destroy_queues; 322 323 ctrl->ctrl.queue_count++; 324 } 325 326 return 0; 327 328 out_destroy_queues: 329 nvme_loop_destroy_io_queues(ctrl); 330 return ret; 331 } 332 333 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) 334 { 335 int i, ret; 336 337 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 338 ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false); 339 if (ret) 340 return ret; 341 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 342 } 343 344 return 0; 345 } 346 347 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) 348 { 349 int error; 350 351 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); 352 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; 353 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 354 ctrl->admin_tag_set.reserved_tags = NVMF_RESERVED_TAGS; 355 ctrl->admin_tag_set.numa_node = ctrl->ctrl.numa_node; 356 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 357 NVME_INLINE_SG_CNT * sizeof(struct scatterlist); 358 ctrl->admin_tag_set.driver_data = ctrl; 359 ctrl->admin_tag_set.nr_hw_queues = 1; 360 ctrl->admin_tag_set.timeout = NVME_ADMIN_TIMEOUT; 361 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; 362 363 ctrl->queues[0].ctrl = ctrl; 364 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); 365 if (error) 366 return error; 367 ctrl->ctrl.queue_count = 1; 368 369 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); 370 if (error) 371 goto out_free_sq; 372 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; 373 374 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set); 375 if (IS_ERR(ctrl->ctrl.fabrics_q)) { 376 error = PTR_ERR(ctrl->ctrl.fabrics_q); 377 goto out_free_tagset; 378 } 379 380 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); 381 if (IS_ERR(ctrl->ctrl.admin_q)) { 382 error = PTR_ERR(ctrl->ctrl.admin_q); 383 goto out_cleanup_fabrics_q; 384 } 385 386 error = nvmf_connect_admin_queue(&ctrl->ctrl); 387 if (error) 388 goto out_cleanup_queue; 389 390 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 391 392 error = nvme_enable_ctrl(&ctrl->ctrl); 393 if (error) 394 goto out_cleanup_queue; 395 396 ctrl->ctrl.max_hw_sectors = 397 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); 398 399 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); 400 401 error = nvme_init_ctrl_finish(&ctrl->ctrl); 402 if (error) 403 goto out_cleanup_queue; 404 405 return 0; 406 407 out_cleanup_queue: 408 blk_cleanup_queue(ctrl->ctrl.admin_q); 409 out_cleanup_fabrics_q: 410 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 411 out_free_tagset: 412 blk_mq_free_tag_set(&ctrl->admin_tag_set); 413 out_free_sq: 414 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 415 return error; 416 } 417 418 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) 419 { 420 if (ctrl->ctrl.queue_count > 1) { 421 nvme_stop_queues(&ctrl->ctrl); 422 blk_mq_tagset_busy_iter(&ctrl->tag_set, 423 nvme_cancel_request, &ctrl->ctrl); 424 blk_mq_tagset_wait_completed_request(&ctrl->tag_set); 425 nvme_loop_destroy_io_queues(ctrl); 426 } 427 428 blk_mq_quiesce_queue(ctrl->ctrl.admin_q); 429 if (ctrl->ctrl.state == NVME_CTRL_LIVE) 430 nvme_shutdown_ctrl(&ctrl->ctrl); 431 432 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, 433 nvme_cancel_request, &ctrl->ctrl); 434 blk_mq_tagset_wait_completed_request(&ctrl->admin_tag_set); 435 nvme_loop_destroy_admin_queue(ctrl); 436 } 437 438 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) 439 { 440 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); 441 } 442 443 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) 444 { 445 struct nvme_loop_ctrl *ctrl; 446 447 mutex_lock(&nvme_loop_ctrl_mutex); 448 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { 449 if (ctrl->ctrl.cntlid == nctrl->cntlid) 450 nvme_delete_ctrl(&ctrl->ctrl); 451 } 452 mutex_unlock(&nvme_loop_ctrl_mutex); 453 } 454 455 static void nvme_loop_reset_ctrl_work(struct work_struct *work) 456 { 457 struct nvme_loop_ctrl *ctrl = 458 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); 459 int ret; 460 461 nvme_stop_ctrl(&ctrl->ctrl); 462 nvme_loop_shutdown_ctrl(ctrl); 463 464 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { 465 /* state change failure should never happen */ 466 WARN_ON_ONCE(1); 467 return; 468 } 469 470 ret = nvme_loop_configure_admin_queue(ctrl); 471 if (ret) 472 goto out_disable; 473 474 ret = nvme_loop_init_io_queues(ctrl); 475 if (ret) 476 goto out_destroy_admin; 477 478 ret = nvme_loop_connect_io_queues(ctrl); 479 if (ret) 480 goto out_destroy_io; 481 482 blk_mq_update_nr_hw_queues(&ctrl->tag_set, 483 ctrl->ctrl.queue_count - 1); 484 485 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE)) 486 WARN_ON_ONCE(1); 487 488 nvme_start_ctrl(&ctrl->ctrl); 489 490 return; 491 492 out_destroy_io: 493 nvme_loop_destroy_io_queues(ctrl); 494 out_destroy_admin: 495 nvme_loop_destroy_admin_queue(ctrl); 496 out_disable: 497 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); 498 nvme_uninit_ctrl(&ctrl->ctrl); 499 } 500 501 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { 502 .name = "loop", 503 .module = THIS_MODULE, 504 .flags = NVME_F_FABRICS, 505 .reg_read32 = nvmf_reg_read32, 506 .reg_read64 = nvmf_reg_read64, 507 .reg_write32 = nvmf_reg_write32, 508 .free_ctrl = nvme_loop_free_ctrl, 509 .submit_async_event = nvme_loop_submit_async_event, 510 .delete_ctrl = nvme_loop_delete_ctrl_host, 511 .get_address = nvmf_get_address, 512 }; 513 514 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) 515 { 516 int ret; 517 518 ret = nvme_loop_init_io_queues(ctrl); 519 if (ret) 520 return ret; 521 522 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); 523 ctrl->tag_set.ops = &nvme_loop_mq_ops; 524 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; 525 ctrl->tag_set.reserved_tags = NVMF_RESERVED_TAGS; 526 ctrl->tag_set.numa_node = ctrl->ctrl.numa_node; 527 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 528 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 529 NVME_INLINE_SG_CNT * sizeof(struct scatterlist); 530 ctrl->tag_set.driver_data = ctrl; 531 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; 532 ctrl->tag_set.timeout = NVME_IO_TIMEOUT; 533 ctrl->ctrl.tagset = &ctrl->tag_set; 534 535 ret = blk_mq_alloc_tag_set(&ctrl->tag_set); 536 if (ret) 537 goto out_destroy_queues; 538 539 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); 540 if (IS_ERR(ctrl->ctrl.connect_q)) { 541 ret = PTR_ERR(ctrl->ctrl.connect_q); 542 goto out_free_tagset; 543 } 544 545 ret = nvme_loop_connect_io_queues(ctrl); 546 if (ret) 547 goto out_cleanup_connect_q; 548 549 return 0; 550 551 out_cleanup_connect_q: 552 blk_cleanup_queue(ctrl->ctrl.connect_q); 553 out_free_tagset: 554 blk_mq_free_tag_set(&ctrl->tag_set); 555 out_destroy_queues: 556 nvme_loop_destroy_io_queues(ctrl); 557 return ret; 558 } 559 560 static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) 561 { 562 struct nvmet_port *p, *found = NULL; 563 564 mutex_lock(&nvme_loop_ports_mutex); 565 list_for_each_entry(p, &nvme_loop_ports, entry) { 566 /* if no transport address is specified use the first port */ 567 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && 568 strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) 569 continue; 570 found = p; 571 break; 572 } 573 mutex_unlock(&nvme_loop_ports_mutex); 574 return found; 575 } 576 577 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 578 struct nvmf_ctrl_options *opts) 579 { 580 struct nvme_loop_ctrl *ctrl; 581 int ret; 582 583 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 584 if (!ctrl) 585 return ERR_PTR(-ENOMEM); 586 ctrl->ctrl.opts = opts; 587 INIT_LIST_HEAD(&ctrl->list); 588 589 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); 590 591 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, 592 0 /* no quirks, we're perfect! */); 593 if (ret) 594 goto out; 595 596 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) 597 WARN_ON_ONCE(1); 598 599 ret = -ENOMEM; 600 601 ctrl->ctrl.sqsize = opts->queue_size - 1; 602 ctrl->ctrl.kato = opts->kato; 603 ctrl->port = nvme_loop_find_port(&ctrl->ctrl); 604 605 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), 606 GFP_KERNEL); 607 if (!ctrl->queues) 608 goto out_uninit_ctrl; 609 610 ret = nvme_loop_configure_admin_queue(ctrl); 611 if (ret) 612 goto out_free_queues; 613 614 if (opts->queue_size > ctrl->ctrl.maxcmd) { 615 /* warn if maxcmd is lower than queue_size */ 616 dev_warn(ctrl->ctrl.device, 617 "queue_size %zu > ctrl maxcmd %u, clamping down\n", 618 opts->queue_size, ctrl->ctrl.maxcmd); 619 opts->queue_size = ctrl->ctrl.maxcmd; 620 } 621 622 if (opts->nr_io_queues) { 623 ret = nvme_loop_create_io_queues(ctrl); 624 if (ret) 625 goto out_remove_admin_queue; 626 } 627 628 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); 629 630 dev_info(ctrl->ctrl.device, 631 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); 632 633 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE)) 634 WARN_ON_ONCE(1); 635 636 mutex_lock(&nvme_loop_ctrl_mutex); 637 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); 638 mutex_unlock(&nvme_loop_ctrl_mutex); 639 640 nvme_start_ctrl(&ctrl->ctrl); 641 642 return &ctrl->ctrl; 643 644 out_remove_admin_queue: 645 nvme_loop_destroy_admin_queue(ctrl); 646 out_free_queues: 647 kfree(ctrl->queues); 648 out_uninit_ctrl: 649 nvme_uninit_ctrl(&ctrl->ctrl); 650 nvme_put_ctrl(&ctrl->ctrl); 651 out: 652 if (ret > 0) 653 ret = -EIO; 654 return ERR_PTR(ret); 655 } 656 657 static int nvme_loop_add_port(struct nvmet_port *port) 658 { 659 mutex_lock(&nvme_loop_ports_mutex); 660 list_add_tail(&port->entry, &nvme_loop_ports); 661 mutex_unlock(&nvme_loop_ports_mutex); 662 return 0; 663 } 664 665 static void nvme_loop_remove_port(struct nvmet_port *port) 666 { 667 mutex_lock(&nvme_loop_ports_mutex); 668 list_del_init(&port->entry); 669 mutex_unlock(&nvme_loop_ports_mutex); 670 671 /* 672 * Ensure any ctrls that are in the process of being 673 * deleted are in fact deleted before we return 674 * and free the port. This is to prevent active 675 * ctrls from using a port after it's freed. 676 */ 677 flush_workqueue(nvme_delete_wq); 678 } 679 680 static const struct nvmet_fabrics_ops nvme_loop_ops = { 681 .owner = THIS_MODULE, 682 .type = NVMF_TRTYPE_LOOP, 683 .add_port = nvme_loop_add_port, 684 .remove_port = nvme_loop_remove_port, 685 .queue_response = nvme_loop_queue_response, 686 .delete_ctrl = nvme_loop_delete_ctrl, 687 }; 688 689 static struct nvmf_transport_ops nvme_loop_transport = { 690 .name = "loop", 691 .module = THIS_MODULE, 692 .create_ctrl = nvme_loop_create_ctrl, 693 .allowed_opts = NVMF_OPT_TRADDR, 694 }; 695 696 static int __init nvme_loop_init_module(void) 697 { 698 int ret; 699 700 ret = nvmet_register_transport(&nvme_loop_ops); 701 if (ret) 702 return ret; 703 704 ret = nvmf_register_transport(&nvme_loop_transport); 705 if (ret) 706 nvmet_unregister_transport(&nvme_loop_ops); 707 708 return ret; 709 } 710 711 static void __exit nvme_loop_cleanup_module(void) 712 { 713 struct nvme_loop_ctrl *ctrl, *next; 714 715 nvmf_unregister_transport(&nvme_loop_transport); 716 nvmet_unregister_transport(&nvme_loop_ops); 717 718 mutex_lock(&nvme_loop_ctrl_mutex); 719 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) 720 nvme_delete_ctrl(&ctrl->ctrl); 721 mutex_unlock(&nvme_loop_ctrl_mutex); 722 723 flush_workqueue(nvme_delete_wq); 724 } 725 726 module_init(nvme_loop_init_module); 727 module_exit(nvme_loop_cleanup_module); 728 729 MODULE_LICENSE("GPL v2"); 730 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ 731