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_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 sg_free_table_chained(&iod->sg_table, NVME_INLINE_SG_CNT); 80 nvme_complete_rq(req); 81 } 82 83 static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) 84 { 85 u32 queue_idx = nvme_loop_queue_idx(queue); 86 87 if (queue_idx == 0) 88 return queue->ctrl->admin_tag_set.tags[queue_idx]; 89 return queue->ctrl->tag_set.tags[queue_idx - 1]; 90 } 91 92 static void nvme_loop_queue_response(struct nvmet_req *req) 93 { 94 struct nvme_loop_queue *queue = 95 container_of(req->sq, struct nvme_loop_queue, nvme_sq); 96 struct nvme_completion *cqe = req->cqe; 97 98 /* 99 * AEN requests are special as they don't time out and can 100 * survive any kind of queue freeze and often don't respond to 101 * aborts. We don't even bother to allocate a struct request 102 * for them but rather special case them here. 103 */ 104 if (unlikely(nvme_is_aen_req(nvme_loop_queue_idx(queue), 105 cqe->command_id))) { 106 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, 107 &cqe->result); 108 } else { 109 struct request *rq; 110 111 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); 112 if (!rq) { 113 dev_err(queue->ctrl->ctrl.device, 114 "tag 0x%x on queue %d not found\n", 115 cqe->command_id, nvme_loop_queue_idx(queue)); 116 return; 117 } 118 119 nvme_end_request(rq, cqe->status, cqe->result); 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 int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 215 unsigned int hctx_idx) 216 { 217 struct nvme_loop_ctrl *ctrl = data; 218 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; 219 220 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); 221 222 hctx->driver_data = queue; 223 return 0; 224 } 225 226 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, 227 unsigned int hctx_idx) 228 { 229 struct nvme_loop_ctrl *ctrl = data; 230 struct nvme_loop_queue *queue = &ctrl->queues[0]; 231 232 BUG_ON(hctx_idx != 0); 233 234 hctx->driver_data = queue; 235 return 0; 236 } 237 238 static const struct blk_mq_ops nvme_loop_mq_ops = { 239 .queue_rq = nvme_loop_queue_rq, 240 .complete = nvme_loop_complete_rq, 241 .init_request = nvme_loop_init_request, 242 .init_hctx = nvme_loop_init_hctx, 243 }; 244 245 static const struct blk_mq_ops nvme_loop_admin_mq_ops = { 246 .queue_rq = nvme_loop_queue_rq, 247 .complete = nvme_loop_complete_rq, 248 .init_request = nvme_loop_init_request, 249 .init_hctx = nvme_loop_init_admin_hctx, 250 }; 251 252 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) 253 { 254 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 255 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 256 blk_cleanup_queue(ctrl->ctrl.admin_q); 257 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 258 blk_mq_free_tag_set(&ctrl->admin_tag_set); 259 } 260 261 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) 262 { 263 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); 264 265 if (list_empty(&ctrl->list)) 266 goto free_ctrl; 267 268 mutex_lock(&nvme_loop_ctrl_mutex); 269 list_del(&ctrl->list); 270 mutex_unlock(&nvme_loop_ctrl_mutex); 271 272 if (nctrl->tagset) { 273 blk_cleanup_queue(ctrl->ctrl.connect_q); 274 blk_mq_free_tag_set(&ctrl->tag_set); 275 } 276 kfree(ctrl->queues); 277 nvmf_free_options(nctrl->opts); 278 free_ctrl: 279 kfree(ctrl); 280 } 281 282 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) 283 { 284 int i; 285 286 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 287 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 288 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); 289 } 290 } 291 292 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) 293 { 294 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; 295 unsigned int nr_io_queues; 296 int ret, i; 297 298 nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); 299 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); 300 if (ret || !nr_io_queues) 301 return ret; 302 303 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); 304 305 for (i = 1; i <= nr_io_queues; i++) { 306 ctrl->queues[i].ctrl = ctrl; 307 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); 308 if (ret) 309 goto out_destroy_queues; 310 311 ctrl->ctrl.queue_count++; 312 } 313 314 return 0; 315 316 out_destroy_queues: 317 nvme_loop_destroy_io_queues(ctrl); 318 return ret; 319 } 320 321 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) 322 { 323 int i, ret; 324 325 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 326 ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false); 327 if (ret) 328 return ret; 329 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 330 } 331 332 return 0; 333 } 334 335 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) 336 { 337 int error; 338 339 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); 340 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; 341 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 342 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ 343 ctrl->admin_tag_set.numa_node = ctrl->ctrl.numa_node; 344 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 345 NVME_INLINE_SG_CNT * sizeof(struct scatterlist); 346 ctrl->admin_tag_set.driver_data = ctrl; 347 ctrl->admin_tag_set.nr_hw_queues = 1; 348 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; 349 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; 350 351 ctrl->queues[0].ctrl = ctrl; 352 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); 353 if (error) 354 return error; 355 ctrl->ctrl.queue_count = 1; 356 357 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); 358 if (error) 359 goto out_free_sq; 360 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; 361 362 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set); 363 if (IS_ERR(ctrl->ctrl.fabrics_q)) { 364 error = PTR_ERR(ctrl->ctrl.fabrics_q); 365 goto out_free_tagset; 366 } 367 368 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); 369 if (IS_ERR(ctrl->ctrl.admin_q)) { 370 error = PTR_ERR(ctrl->ctrl.admin_q); 371 goto out_cleanup_fabrics_q; 372 } 373 374 error = nvmf_connect_admin_queue(&ctrl->ctrl); 375 if (error) 376 goto out_cleanup_queue; 377 378 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 379 380 error = nvme_enable_ctrl(&ctrl->ctrl); 381 if (error) 382 goto out_cleanup_queue; 383 384 ctrl->ctrl.max_hw_sectors = 385 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); 386 387 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); 388 389 error = nvme_init_identify(&ctrl->ctrl); 390 if (error) 391 goto out_cleanup_queue; 392 393 return 0; 394 395 out_cleanup_queue: 396 blk_cleanup_queue(ctrl->ctrl.admin_q); 397 out_cleanup_fabrics_q: 398 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 399 out_free_tagset: 400 blk_mq_free_tag_set(&ctrl->admin_tag_set); 401 out_free_sq: 402 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 403 return error; 404 } 405 406 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) 407 { 408 if (ctrl->ctrl.queue_count > 1) { 409 nvme_stop_queues(&ctrl->ctrl); 410 blk_mq_tagset_busy_iter(&ctrl->tag_set, 411 nvme_cancel_request, &ctrl->ctrl); 412 blk_mq_tagset_wait_completed_request(&ctrl->tag_set); 413 nvme_loop_destroy_io_queues(ctrl); 414 } 415 416 blk_mq_quiesce_queue(ctrl->ctrl.admin_q); 417 if (ctrl->ctrl.state == NVME_CTRL_LIVE) 418 nvme_shutdown_ctrl(&ctrl->ctrl); 419 420 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, 421 nvme_cancel_request, &ctrl->ctrl); 422 blk_mq_tagset_wait_completed_request(&ctrl->admin_tag_set); 423 nvme_loop_destroy_admin_queue(ctrl); 424 } 425 426 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) 427 { 428 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); 429 } 430 431 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) 432 { 433 struct nvme_loop_ctrl *ctrl; 434 435 mutex_lock(&nvme_loop_ctrl_mutex); 436 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { 437 if (ctrl->ctrl.cntlid == nctrl->cntlid) 438 nvme_delete_ctrl(&ctrl->ctrl); 439 } 440 mutex_unlock(&nvme_loop_ctrl_mutex); 441 } 442 443 static void nvme_loop_reset_ctrl_work(struct work_struct *work) 444 { 445 struct nvme_loop_ctrl *ctrl = 446 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); 447 bool changed; 448 int ret; 449 450 nvme_stop_ctrl(&ctrl->ctrl); 451 nvme_loop_shutdown_ctrl(ctrl); 452 453 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { 454 /* state change failure should never happen */ 455 WARN_ON_ONCE(1); 456 return; 457 } 458 459 ret = nvme_loop_configure_admin_queue(ctrl); 460 if (ret) 461 goto out_disable; 462 463 ret = nvme_loop_init_io_queues(ctrl); 464 if (ret) 465 goto out_destroy_admin; 466 467 ret = nvme_loop_connect_io_queues(ctrl); 468 if (ret) 469 goto out_destroy_io; 470 471 blk_mq_update_nr_hw_queues(&ctrl->tag_set, 472 ctrl->ctrl.queue_count - 1); 473 474 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 475 WARN_ON_ONCE(!changed); 476 477 nvme_start_ctrl(&ctrl->ctrl); 478 479 return; 480 481 out_destroy_io: 482 nvme_loop_destroy_io_queues(ctrl); 483 out_destroy_admin: 484 nvme_loop_destroy_admin_queue(ctrl); 485 out_disable: 486 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); 487 nvme_uninit_ctrl(&ctrl->ctrl); 488 } 489 490 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { 491 .name = "loop", 492 .module = THIS_MODULE, 493 .flags = NVME_F_FABRICS, 494 .reg_read32 = nvmf_reg_read32, 495 .reg_read64 = nvmf_reg_read64, 496 .reg_write32 = nvmf_reg_write32, 497 .free_ctrl = nvme_loop_free_ctrl, 498 .submit_async_event = nvme_loop_submit_async_event, 499 .delete_ctrl = nvme_loop_delete_ctrl_host, 500 .get_address = nvmf_get_address, 501 }; 502 503 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) 504 { 505 int ret; 506 507 ret = nvme_loop_init_io_queues(ctrl); 508 if (ret) 509 return ret; 510 511 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); 512 ctrl->tag_set.ops = &nvme_loop_mq_ops; 513 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; 514 ctrl->tag_set.reserved_tags = 1; /* fabric connect */ 515 ctrl->tag_set.numa_node = ctrl->ctrl.numa_node; 516 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 517 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 518 NVME_INLINE_SG_CNT * sizeof(struct scatterlist); 519 ctrl->tag_set.driver_data = ctrl; 520 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; 521 ctrl->tag_set.timeout = NVME_IO_TIMEOUT; 522 ctrl->ctrl.tagset = &ctrl->tag_set; 523 524 ret = blk_mq_alloc_tag_set(&ctrl->tag_set); 525 if (ret) 526 goto out_destroy_queues; 527 528 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); 529 if (IS_ERR(ctrl->ctrl.connect_q)) { 530 ret = PTR_ERR(ctrl->ctrl.connect_q); 531 goto out_free_tagset; 532 } 533 534 ret = nvme_loop_connect_io_queues(ctrl); 535 if (ret) 536 goto out_cleanup_connect_q; 537 538 return 0; 539 540 out_cleanup_connect_q: 541 blk_cleanup_queue(ctrl->ctrl.connect_q); 542 out_free_tagset: 543 blk_mq_free_tag_set(&ctrl->tag_set); 544 out_destroy_queues: 545 nvme_loop_destroy_io_queues(ctrl); 546 return ret; 547 } 548 549 static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) 550 { 551 struct nvmet_port *p, *found = NULL; 552 553 mutex_lock(&nvme_loop_ports_mutex); 554 list_for_each_entry(p, &nvme_loop_ports, entry) { 555 /* if no transport address is specified use the first port */ 556 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && 557 strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) 558 continue; 559 found = p; 560 break; 561 } 562 mutex_unlock(&nvme_loop_ports_mutex); 563 return found; 564 } 565 566 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 567 struct nvmf_ctrl_options *opts) 568 { 569 struct nvme_loop_ctrl *ctrl; 570 bool changed; 571 int ret; 572 573 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 574 if (!ctrl) 575 return ERR_PTR(-ENOMEM); 576 ctrl->ctrl.opts = opts; 577 INIT_LIST_HEAD(&ctrl->list); 578 579 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); 580 581 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, 582 0 /* no quirks, we're perfect! */); 583 if (ret) 584 goto out_put_ctrl; 585 586 ret = -ENOMEM; 587 588 ctrl->ctrl.sqsize = opts->queue_size - 1; 589 ctrl->ctrl.kato = opts->kato; 590 ctrl->port = nvme_loop_find_port(&ctrl->ctrl); 591 592 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), 593 GFP_KERNEL); 594 if (!ctrl->queues) 595 goto out_uninit_ctrl; 596 597 ret = nvme_loop_configure_admin_queue(ctrl); 598 if (ret) 599 goto out_free_queues; 600 601 if (opts->queue_size > ctrl->ctrl.maxcmd) { 602 /* warn if maxcmd is lower than queue_size */ 603 dev_warn(ctrl->ctrl.device, 604 "queue_size %zu > ctrl maxcmd %u, clamping down\n", 605 opts->queue_size, ctrl->ctrl.maxcmd); 606 opts->queue_size = ctrl->ctrl.maxcmd; 607 } 608 609 if (opts->nr_io_queues) { 610 ret = nvme_loop_create_io_queues(ctrl); 611 if (ret) 612 goto out_remove_admin_queue; 613 } 614 615 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); 616 617 dev_info(ctrl->ctrl.device, 618 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); 619 620 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 621 WARN_ON_ONCE(!changed); 622 623 mutex_lock(&nvme_loop_ctrl_mutex); 624 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); 625 mutex_unlock(&nvme_loop_ctrl_mutex); 626 627 nvme_start_ctrl(&ctrl->ctrl); 628 629 return &ctrl->ctrl; 630 631 out_remove_admin_queue: 632 nvme_loop_destroy_admin_queue(ctrl); 633 out_free_queues: 634 kfree(ctrl->queues); 635 out_uninit_ctrl: 636 nvme_uninit_ctrl(&ctrl->ctrl); 637 out_put_ctrl: 638 nvme_put_ctrl(&ctrl->ctrl); 639 if (ret > 0) 640 ret = -EIO; 641 return ERR_PTR(ret); 642 } 643 644 static int nvme_loop_add_port(struct nvmet_port *port) 645 { 646 mutex_lock(&nvme_loop_ports_mutex); 647 list_add_tail(&port->entry, &nvme_loop_ports); 648 mutex_unlock(&nvme_loop_ports_mutex); 649 return 0; 650 } 651 652 static void nvme_loop_remove_port(struct nvmet_port *port) 653 { 654 mutex_lock(&nvme_loop_ports_mutex); 655 list_del_init(&port->entry); 656 mutex_unlock(&nvme_loop_ports_mutex); 657 658 /* 659 * Ensure any ctrls that are in the process of being 660 * deleted are in fact deleted before we return 661 * and free the port. This is to prevent active 662 * ctrls from using a port after it's freed. 663 */ 664 flush_workqueue(nvme_delete_wq); 665 } 666 667 static const struct nvmet_fabrics_ops nvme_loop_ops = { 668 .owner = THIS_MODULE, 669 .type = NVMF_TRTYPE_LOOP, 670 .add_port = nvme_loop_add_port, 671 .remove_port = nvme_loop_remove_port, 672 .queue_response = nvme_loop_queue_response, 673 .delete_ctrl = nvme_loop_delete_ctrl, 674 }; 675 676 static struct nvmf_transport_ops nvme_loop_transport = { 677 .name = "loop", 678 .module = THIS_MODULE, 679 .create_ctrl = nvme_loop_create_ctrl, 680 .allowed_opts = NVMF_OPT_TRADDR, 681 }; 682 683 static int __init nvme_loop_init_module(void) 684 { 685 int ret; 686 687 ret = nvmet_register_transport(&nvme_loop_ops); 688 if (ret) 689 return ret; 690 691 ret = nvmf_register_transport(&nvme_loop_transport); 692 if (ret) 693 nvmet_unregister_transport(&nvme_loop_ops); 694 695 return ret; 696 } 697 698 static void __exit nvme_loop_cleanup_module(void) 699 { 700 struct nvme_loop_ctrl *ctrl, *next; 701 702 nvmf_unregister_transport(&nvme_loop_transport); 703 nvmet_unregister_transport(&nvme_loop_ops); 704 705 mutex_lock(&nvme_loop_ctrl_mutex); 706 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) 707 nvme_delete_ctrl(&ctrl->ctrl); 708 mutex_unlock(&nvme_loop_ctrl_mutex); 709 710 flush_workqueue(nvme_delete_wq); 711 } 712 713 module_init(nvme_loop_init_module); 714 module_exit(nvme_loop_cleanup_module); 715 716 MODULE_LICENSE("GPL v2"); 717 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ 718