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 (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready)) 142 return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req); 143 144 ret = nvme_setup_cmd(ns, req, &iod->cmd); 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; 208 209 nvme_req(req)->ctrl = &ctrl->ctrl; 210 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), 211 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); 212 } 213 214 static struct lock_class_key loop_hctx_fq_lock_key; 215 216 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 217 unsigned int hctx_idx) 218 { 219 struct nvme_loop_ctrl *ctrl = data; 220 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; 221 222 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); 223 224 /* 225 * flush_end_io() can be called recursively for us, so use our own 226 * lock class key for avoiding lockdep possible recursive locking, 227 * then we can remove the dynamically allocated lock class for each 228 * flush queue, that way may cause horrible boot delay. 229 */ 230 blk_mq_hctx_set_fq_lock_class(hctx, &loop_hctx_fq_lock_key); 231 232 hctx->driver_data = queue; 233 return 0; 234 } 235 236 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, 237 unsigned int hctx_idx) 238 { 239 struct nvme_loop_ctrl *ctrl = data; 240 struct nvme_loop_queue *queue = &ctrl->queues[0]; 241 242 BUG_ON(hctx_idx != 0); 243 244 hctx->driver_data = queue; 245 return 0; 246 } 247 248 static const struct blk_mq_ops nvme_loop_mq_ops = { 249 .queue_rq = nvme_loop_queue_rq, 250 .complete = nvme_loop_complete_rq, 251 .init_request = nvme_loop_init_request, 252 .init_hctx = nvme_loop_init_hctx, 253 }; 254 255 static const struct blk_mq_ops nvme_loop_admin_mq_ops = { 256 .queue_rq = nvme_loop_queue_rq, 257 .complete = nvme_loop_complete_rq, 258 .init_request = nvme_loop_init_request, 259 .init_hctx = nvme_loop_init_admin_hctx, 260 }; 261 262 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) 263 { 264 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 265 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 266 blk_cleanup_queue(ctrl->ctrl.admin_q); 267 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 268 blk_mq_free_tag_set(&ctrl->admin_tag_set); 269 } 270 271 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) 272 { 273 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); 274 275 if (list_empty(&ctrl->list)) 276 goto free_ctrl; 277 278 mutex_lock(&nvme_loop_ctrl_mutex); 279 list_del(&ctrl->list); 280 mutex_unlock(&nvme_loop_ctrl_mutex); 281 282 if (nctrl->tagset) { 283 blk_cleanup_queue(ctrl->ctrl.connect_q); 284 blk_mq_free_tag_set(&ctrl->tag_set); 285 } 286 kfree(ctrl->queues); 287 nvmf_free_options(nctrl->opts); 288 free_ctrl: 289 kfree(ctrl); 290 } 291 292 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) 293 { 294 int i; 295 296 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 297 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 298 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); 299 } 300 } 301 302 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) 303 { 304 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; 305 unsigned int nr_io_queues; 306 int ret, i; 307 308 nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); 309 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); 310 if (ret || !nr_io_queues) 311 return ret; 312 313 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); 314 315 for (i = 1; i <= nr_io_queues; i++) { 316 ctrl->queues[i].ctrl = ctrl; 317 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); 318 if (ret) 319 goto out_destroy_queues; 320 321 ctrl->ctrl.queue_count++; 322 } 323 324 return 0; 325 326 out_destroy_queues: 327 nvme_loop_destroy_io_queues(ctrl); 328 return ret; 329 } 330 331 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) 332 { 333 int i, ret; 334 335 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 336 ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false); 337 if (ret) 338 return ret; 339 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 340 } 341 342 return 0; 343 } 344 345 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) 346 { 347 int error; 348 349 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); 350 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; 351 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 352 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ 353 ctrl->admin_tag_set.numa_node = ctrl->ctrl.numa_node; 354 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 355 NVME_INLINE_SG_CNT * sizeof(struct scatterlist); 356 ctrl->admin_tag_set.driver_data = ctrl; 357 ctrl->admin_tag_set.nr_hw_queues = 1; 358 ctrl->admin_tag_set.timeout = NVME_ADMIN_TIMEOUT; 359 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; 360 361 ctrl->queues[0].ctrl = ctrl; 362 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); 363 if (error) 364 return error; 365 ctrl->ctrl.queue_count = 1; 366 367 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); 368 if (error) 369 goto out_free_sq; 370 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; 371 372 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set); 373 if (IS_ERR(ctrl->ctrl.fabrics_q)) { 374 error = PTR_ERR(ctrl->ctrl.fabrics_q); 375 goto out_free_tagset; 376 } 377 378 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); 379 if (IS_ERR(ctrl->ctrl.admin_q)) { 380 error = PTR_ERR(ctrl->ctrl.admin_q); 381 goto out_cleanup_fabrics_q; 382 } 383 384 error = nvmf_connect_admin_queue(&ctrl->ctrl); 385 if (error) 386 goto out_cleanup_queue; 387 388 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 389 390 error = nvme_enable_ctrl(&ctrl->ctrl); 391 if (error) 392 goto out_cleanup_queue; 393 394 ctrl->ctrl.max_hw_sectors = 395 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); 396 397 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); 398 399 error = nvme_init_identify(&ctrl->ctrl); 400 if (error) 401 goto out_cleanup_queue; 402 403 return 0; 404 405 out_cleanup_queue: 406 blk_cleanup_queue(ctrl->ctrl.admin_q); 407 out_cleanup_fabrics_q: 408 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 409 out_free_tagset: 410 blk_mq_free_tag_set(&ctrl->admin_tag_set); 411 out_free_sq: 412 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 413 return error; 414 } 415 416 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) 417 { 418 if (ctrl->ctrl.queue_count > 1) { 419 nvme_stop_queues(&ctrl->ctrl); 420 blk_mq_tagset_busy_iter(&ctrl->tag_set, 421 nvme_cancel_request, &ctrl->ctrl); 422 blk_mq_tagset_wait_completed_request(&ctrl->tag_set); 423 nvme_loop_destroy_io_queues(ctrl); 424 } 425 426 blk_mq_quiesce_queue(ctrl->ctrl.admin_q); 427 if (ctrl->ctrl.state == NVME_CTRL_LIVE) 428 nvme_shutdown_ctrl(&ctrl->ctrl); 429 430 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, 431 nvme_cancel_request, &ctrl->ctrl); 432 blk_mq_tagset_wait_completed_request(&ctrl->admin_tag_set); 433 nvme_loop_destroy_admin_queue(ctrl); 434 } 435 436 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) 437 { 438 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); 439 } 440 441 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) 442 { 443 struct nvme_loop_ctrl *ctrl; 444 445 mutex_lock(&nvme_loop_ctrl_mutex); 446 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { 447 if (ctrl->ctrl.cntlid == nctrl->cntlid) 448 nvme_delete_ctrl(&ctrl->ctrl); 449 } 450 mutex_unlock(&nvme_loop_ctrl_mutex); 451 } 452 453 static void nvme_loop_reset_ctrl_work(struct work_struct *work) 454 { 455 struct nvme_loop_ctrl *ctrl = 456 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); 457 int ret; 458 459 nvme_stop_ctrl(&ctrl->ctrl); 460 nvme_loop_shutdown_ctrl(ctrl); 461 462 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { 463 /* state change failure should never happen */ 464 WARN_ON_ONCE(1); 465 return; 466 } 467 468 ret = nvme_loop_configure_admin_queue(ctrl); 469 if (ret) 470 goto out_disable; 471 472 ret = nvme_loop_init_io_queues(ctrl); 473 if (ret) 474 goto out_destroy_admin; 475 476 ret = nvme_loop_connect_io_queues(ctrl); 477 if (ret) 478 goto out_destroy_io; 479 480 blk_mq_update_nr_hw_queues(&ctrl->tag_set, 481 ctrl->ctrl.queue_count - 1); 482 483 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE)) 484 WARN_ON_ONCE(1); 485 486 nvme_start_ctrl(&ctrl->ctrl); 487 488 return; 489 490 out_destroy_io: 491 nvme_loop_destroy_io_queues(ctrl); 492 out_destroy_admin: 493 nvme_loop_destroy_admin_queue(ctrl); 494 out_disable: 495 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); 496 nvme_uninit_ctrl(&ctrl->ctrl); 497 } 498 499 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { 500 .name = "loop", 501 .module = THIS_MODULE, 502 .flags = NVME_F_FABRICS, 503 .reg_read32 = nvmf_reg_read32, 504 .reg_read64 = nvmf_reg_read64, 505 .reg_write32 = nvmf_reg_write32, 506 .free_ctrl = nvme_loop_free_ctrl, 507 .submit_async_event = nvme_loop_submit_async_event, 508 .delete_ctrl = nvme_loop_delete_ctrl_host, 509 .get_address = nvmf_get_address, 510 }; 511 512 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) 513 { 514 int ret; 515 516 ret = nvme_loop_init_io_queues(ctrl); 517 if (ret) 518 return ret; 519 520 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); 521 ctrl->tag_set.ops = &nvme_loop_mq_ops; 522 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; 523 ctrl->tag_set.reserved_tags = 1; /* fabric connect */ 524 ctrl->tag_set.numa_node = ctrl->ctrl.numa_node; 525 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 526 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 527 NVME_INLINE_SG_CNT * sizeof(struct scatterlist); 528 ctrl->tag_set.driver_data = ctrl; 529 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; 530 ctrl->tag_set.timeout = NVME_IO_TIMEOUT; 531 ctrl->ctrl.tagset = &ctrl->tag_set; 532 533 ret = blk_mq_alloc_tag_set(&ctrl->tag_set); 534 if (ret) 535 goto out_destroy_queues; 536 537 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); 538 if (IS_ERR(ctrl->ctrl.connect_q)) { 539 ret = PTR_ERR(ctrl->ctrl.connect_q); 540 goto out_free_tagset; 541 } 542 543 ret = nvme_loop_connect_io_queues(ctrl); 544 if (ret) 545 goto out_cleanup_connect_q; 546 547 return 0; 548 549 out_cleanup_connect_q: 550 blk_cleanup_queue(ctrl->ctrl.connect_q); 551 out_free_tagset: 552 blk_mq_free_tag_set(&ctrl->tag_set); 553 out_destroy_queues: 554 nvme_loop_destroy_io_queues(ctrl); 555 return ret; 556 } 557 558 static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) 559 { 560 struct nvmet_port *p, *found = NULL; 561 562 mutex_lock(&nvme_loop_ports_mutex); 563 list_for_each_entry(p, &nvme_loop_ports, entry) { 564 /* if no transport address is specified use the first port */ 565 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && 566 strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) 567 continue; 568 found = p; 569 break; 570 } 571 mutex_unlock(&nvme_loop_ports_mutex); 572 return found; 573 } 574 575 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 576 struct nvmf_ctrl_options *opts) 577 { 578 struct nvme_loop_ctrl *ctrl; 579 int ret; 580 581 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 582 if (!ctrl) 583 return ERR_PTR(-ENOMEM); 584 ctrl->ctrl.opts = opts; 585 INIT_LIST_HEAD(&ctrl->list); 586 587 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); 588 589 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, 590 0 /* no quirks, we're perfect! */); 591 if (ret) 592 goto out; 593 594 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) 595 WARN_ON_ONCE(1); 596 597 ret = -ENOMEM; 598 599 ctrl->ctrl.sqsize = opts->queue_size - 1; 600 ctrl->ctrl.kato = opts->kato; 601 ctrl->port = nvme_loop_find_port(&ctrl->ctrl); 602 603 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), 604 GFP_KERNEL); 605 if (!ctrl->queues) 606 goto out_uninit_ctrl; 607 608 ret = nvme_loop_configure_admin_queue(ctrl); 609 if (ret) 610 goto out_free_queues; 611 612 if (opts->queue_size > ctrl->ctrl.maxcmd) { 613 /* warn if maxcmd is lower than queue_size */ 614 dev_warn(ctrl->ctrl.device, 615 "queue_size %zu > ctrl maxcmd %u, clamping down\n", 616 opts->queue_size, ctrl->ctrl.maxcmd); 617 opts->queue_size = ctrl->ctrl.maxcmd; 618 } 619 620 if (opts->nr_io_queues) { 621 ret = nvme_loop_create_io_queues(ctrl); 622 if (ret) 623 goto out_remove_admin_queue; 624 } 625 626 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); 627 628 dev_info(ctrl->ctrl.device, 629 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); 630 631 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE)) 632 WARN_ON_ONCE(1); 633 634 mutex_lock(&nvme_loop_ctrl_mutex); 635 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); 636 mutex_unlock(&nvme_loop_ctrl_mutex); 637 638 nvme_start_ctrl(&ctrl->ctrl); 639 640 return &ctrl->ctrl; 641 642 out_remove_admin_queue: 643 nvme_loop_destroy_admin_queue(ctrl); 644 out_free_queues: 645 kfree(ctrl->queues); 646 out_uninit_ctrl: 647 nvme_uninit_ctrl(&ctrl->ctrl); 648 nvme_put_ctrl(&ctrl->ctrl); 649 out: 650 if (ret > 0) 651 ret = -EIO; 652 return ERR_PTR(ret); 653 } 654 655 static int nvme_loop_add_port(struct nvmet_port *port) 656 { 657 mutex_lock(&nvme_loop_ports_mutex); 658 list_add_tail(&port->entry, &nvme_loop_ports); 659 mutex_unlock(&nvme_loop_ports_mutex); 660 return 0; 661 } 662 663 static void nvme_loop_remove_port(struct nvmet_port *port) 664 { 665 mutex_lock(&nvme_loop_ports_mutex); 666 list_del_init(&port->entry); 667 mutex_unlock(&nvme_loop_ports_mutex); 668 669 /* 670 * Ensure any ctrls that are in the process of being 671 * deleted are in fact deleted before we return 672 * and free the port. This is to prevent active 673 * ctrls from using a port after it's freed. 674 */ 675 flush_workqueue(nvme_delete_wq); 676 } 677 678 static const struct nvmet_fabrics_ops nvme_loop_ops = { 679 .owner = THIS_MODULE, 680 .type = NVMF_TRTYPE_LOOP, 681 .add_port = nvme_loop_add_port, 682 .remove_port = nvme_loop_remove_port, 683 .queue_response = nvme_loop_queue_response, 684 .delete_ctrl = nvme_loop_delete_ctrl, 685 }; 686 687 static struct nvmf_transport_ops nvme_loop_transport = { 688 .name = "loop", 689 .module = THIS_MODULE, 690 .create_ctrl = nvme_loop_create_ctrl, 691 .allowed_opts = NVMF_OPT_TRADDR, 692 }; 693 694 static int __init nvme_loop_init_module(void) 695 { 696 int ret; 697 698 ret = nvmet_register_transport(&nvme_loop_ops); 699 if (ret) 700 return ret; 701 702 ret = nvmf_register_transport(&nvme_loop_transport); 703 if (ret) 704 nvmet_unregister_transport(&nvme_loop_ops); 705 706 return ret; 707 } 708 709 static void __exit nvme_loop_cleanup_module(void) 710 { 711 struct nvme_loop_ctrl *ctrl, *next; 712 713 nvmf_unregister_transport(&nvme_loop_transport); 714 nvmet_unregister_transport(&nvme_loop_ops); 715 716 mutex_lock(&nvme_loop_ctrl_mutex); 717 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) 718 nvme_delete_ctrl(&ctrl->ctrl); 719 mutex_unlock(&nvme_loop_ctrl_mutex); 720 721 flush_workqueue(nvme_delete_wq); 722 } 723 724 module_init(nvme_loop_init_module); 725 module_exit(nvme_loop_cleanup_module); 726 727 MODULE_LICENSE("GPL v2"); 728 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ 729