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 if (!nvme_end_request(rq, cqe->status, cqe->result)) 120 nvme_loop_complete_rq(rq); 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 iod->req.execute(&iod->req); 130 } 131 132 static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, 133 const struct blk_mq_queue_data *bd) 134 { 135 struct nvme_ns *ns = hctx->queue->queuedata; 136 struct nvme_loop_queue *queue = hctx->driver_data; 137 struct request *req = bd->rq; 138 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 139 bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags); 140 blk_status_t ret; 141 142 if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready)) 143 return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req); 144 145 ret = nvme_setup_cmd(ns, req, &iod->cmd); 146 if (ret) 147 return ret; 148 149 blk_mq_start_request(req); 150 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 151 iod->req.port = queue->ctrl->port; 152 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, 153 &queue->nvme_sq, &nvme_loop_ops)) 154 return BLK_STS_OK; 155 156 if (blk_rq_nr_phys_segments(req)) { 157 iod->sg_table.sgl = iod->first_sgl; 158 if (sg_alloc_table_chained(&iod->sg_table, 159 blk_rq_nr_phys_segments(req), 160 iod->sg_table.sgl, NVME_INLINE_SG_CNT)) { 161 nvme_cleanup_cmd(req); 162 return BLK_STS_RESOURCE; 163 } 164 165 iod->req.sg = iod->sg_table.sgl; 166 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); 167 iod->req.transfer_len = blk_rq_payload_bytes(req); 168 } 169 170 schedule_work(&iod->work); 171 return BLK_STS_OK; 172 } 173 174 static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) 175 { 176 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); 177 struct nvme_loop_queue *queue = &ctrl->queues[0]; 178 struct nvme_loop_iod *iod = &ctrl->async_event_iod; 179 180 memset(&iod->cmd, 0, sizeof(iod->cmd)); 181 iod->cmd.common.opcode = nvme_admin_async_event; 182 iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; 183 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 184 185 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, 186 &nvme_loop_ops)) { 187 dev_err(ctrl->ctrl.device, "failed async event work\n"); 188 return; 189 } 190 191 schedule_work(&iod->work); 192 } 193 194 static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, 195 struct nvme_loop_iod *iod, unsigned int queue_idx) 196 { 197 iod->req.cmd = &iod->cmd; 198 iod->req.cqe = &iod->cqe; 199 iod->queue = &ctrl->queues[queue_idx]; 200 INIT_WORK(&iod->work, nvme_loop_execute_work); 201 return 0; 202 } 203 204 static int nvme_loop_init_request(struct blk_mq_tag_set *set, 205 struct request *req, unsigned int hctx_idx, 206 unsigned int numa_node) 207 { 208 struct nvme_loop_ctrl *ctrl = set->driver_data; 209 210 nvme_req(req)->ctrl = &ctrl->ctrl; 211 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), 212 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); 213 } 214 215 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 216 unsigned int hctx_idx) 217 { 218 struct nvme_loop_ctrl *ctrl = data; 219 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; 220 221 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); 222 223 hctx->driver_data = queue; 224 return 0; 225 } 226 227 static int nvme_loop_init_admin_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[0]; 232 233 BUG_ON(hctx_idx != 0); 234 235 hctx->driver_data = queue; 236 return 0; 237 } 238 239 static const struct blk_mq_ops nvme_loop_mq_ops = { 240 .queue_rq = nvme_loop_queue_rq, 241 .complete = nvme_loop_complete_rq, 242 .init_request = nvme_loop_init_request, 243 .init_hctx = nvme_loop_init_hctx, 244 }; 245 246 static const struct blk_mq_ops nvme_loop_admin_mq_ops = { 247 .queue_rq = nvme_loop_queue_rq, 248 .complete = nvme_loop_complete_rq, 249 .init_request = nvme_loop_init_request, 250 .init_hctx = nvme_loop_init_admin_hctx, 251 }; 252 253 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) 254 { 255 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 256 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 257 blk_cleanup_queue(ctrl->ctrl.admin_q); 258 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 259 blk_mq_free_tag_set(&ctrl->admin_tag_set); 260 } 261 262 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) 263 { 264 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); 265 266 if (list_empty(&ctrl->list)) 267 goto free_ctrl; 268 269 mutex_lock(&nvme_loop_ctrl_mutex); 270 list_del(&ctrl->list); 271 mutex_unlock(&nvme_loop_ctrl_mutex); 272 273 if (nctrl->tagset) { 274 blk_cleanup_queue(ctrl->ctrl.connect_q); 275 blk_mq_free_tag_set(&ctrl->tag_set); 276 } 277 kfree(ctrl->queues); 278 nvmf_free_options(nctrl->opts); 279 free_ctrl: 280 kfree(ctrl); 281 } 282 283 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) 284 { 285 int i; 286 287 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 288 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 289 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); 290 } 291 } 292 293 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) 294 { 295 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; 296 unsigned int nr_io_queues; 297 int ret, i; 298 299 nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); 300 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); 301 if (ret || !nr_io_queues) 302 return ret; 303 304 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); 305 306 for (i = 1; i <= nr_io_queues; i++) { 307 ctrl->queues[i].ctrl = ctrl; 308 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); 309 if (ret) 310 goto out_destroy_queues; 311 312 ctrl->ctrl.queue_count++; 313 } 314 315 return 0; 316 317 out_destroy_queues: 318 nvme_loop_destroy_io_queues(ctrl); 319 return ret; 320 } 321 322 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) 323 { 324 int i, ret; 325 326 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 327 ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false); 328 if (ret) 329 return ret; 330 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 331 } 332 333 return 0; 334 } 335 336 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) 337 { 338 int error; 339 340 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); 341 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; 342 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 343 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ 344 ctrl->admin_tag_set.numa_node = ctrl->ctrl.numa_node; 345 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 346 NVME_INLINE_SG_CNT * sizeof(struct scatterlist); 347 ctrl->admin_tag_set.driver_data = ctrl; 348 ctrl->admin_tag_set.nr_hw_queues = 1; 349 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; 350 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; 351 352 ctrl->queues[0].ctrl = ctrl; 353 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); 354 if (error) 355 return error; 356 ctrl->ctrl.queue_count = 1; 357 358 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); 359 if (error) 360 goto out_free_sq; 361 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; 362 363 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set); 364 if (IS_ERR(ctrl->ctrl.fabrics_q)) { 365 error = PTR_ERR(ctrl->ctrl.fabrics_q); 366 goto out_free_tagset; 367 } 368 369 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); 370 if (IS_ERR(ctrl->ctrl.admin_q)) { 371 error = PTR_ERR(ctrl->ctrl.admin_q); 372 goto out_cleanup_fabrics_q; 373 } 374 375 error = nvmf_connect_admin_queue(&ctrl->ctrl); 376 if (error) 377 goto out_cleanup_queue; 378 379 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 380 381 error = nvme_enable_ctrl(&ctrl->ctrl); 382 if (error) 383 goto out_cleanup_queue; 384 385 ctrl->ctrl.max_hw_sectors = 386 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); 387 388 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); 389 390 error = nvme_init_identify(&ctrl->ctrl); 391 if (error) 392 goto out_cleanup_queue; 393 394 return 0; 395 396 out_cleanup_queue: 397 blk_cleanup_queue(ctrl->ctrl.admin_q); 398 out_cleanup_fabrics_q: 399 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 400 out_free_tagset: 401 blk_mq_free_tag_set(&ctrl->admin_tag_set); 402 out_free_sq: 403 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 404 return error; 405 } 406 407 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) 408 { 409 if (ctrl->ctrl.queue_count > 1) { 410 nvme_stop_queues(&ctrl->ctrl); 411 blk_mq_tagset_busy_iter(&ctrl->tag_set, 412 nvme_cancel_request, &ctrl->ctrl); 413 blk_mq_tagset_wait_completed_request(&ctrl->tag_set); 414 nvme_loop_destroy_io_queues(ctrl); 415 } 416 417 blk_mq_quiesce_queue(ctrl->ctrl.admin_q); 418 if (ctrl->ctrl.state == NVME_CTRL_LIVE) 419 nvme_shutdown_ctrl(&ctrl->ctrl); 420 421 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, 422 nvme_cancel_request, &ctrl->ctrl); 423 blk_mq_tagset_wait_completed_request(&ctrl->admin_tag_set); 424 nvme_loop_destroy_admin_queue(ctrl); 425 } 426 427 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) 428 { 429 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); 430 } 431 432 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) 433 { 434 struct nvme_loop_ctrl *ctrl; 435 436 mutex_lock(&nvme_loop_ctrl_mutex); 437 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { 438 if (ctrl->ctrl.cntlid == nctrl->cntlid) 439 nvme_delete_ctrl(&ctrl->ctrl); 440 } 441 mutex_unlock(&nvme_loop_ctrl_mutex); 442 } 443 444 static void nvme_loop_reset_ctrl_work(struct work_struct *work) 445 { 446 struct nvme_loop_ctrl *ctrl = 447 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); 448 bool changed; 449 int ret; 450 451 nvme_stop_ctrl(&ctrl->ctrl); 452 nvme_loop_shutdown_ctrl(ctrl); 453 454 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { 455 /* state change failure should never happen */ 456 WARN_ON_ONCE(1); 457 return; 458 } 459 460 ret = nvme_loop_configure_admin_queue(ctrl); 461 if (ret) 462 goto out_disable; 463 464 ret = nvme_loop_init_io_queues(ctrl); 465 if (ret) 466 goto out_destroy_admin; 467 468 ret = nvme_loop_connect_io_queues(ctrl); 469 if (ret) 470 goto out_destroy_io; 471 472 blk_mq_update_nr_hw_queues(&ctrl->tag_set, 473 ctrl->ctrl.queue_count - 1); 474 475 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 476 WARN_ON_ONCE(!changed); 477 478 nvme_start_ctrl(&ctrl->ctrl); 479 480 return; 481 482 out_destroy_io: 483 nvme_loop_destroy_io_queues(ctrl); 484 out_destroy_admin: 485 nvme_loop_destroy_admin_queue(ctrl); 486 out_disable: 487 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); 488 nvme_uninit_ctrl(&ctrl->ctrl); 489 } 490 491 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { 492 .name = "loop", 493 .module = THIS_MODULE, 494 .flags = NVME_F_FABRICS, 495 .reg_read32 = nvmf_reg_read32, 496 .reg_read64 = nvmf_reg_read64, 497 .reg_write32 = nvmf_reg_write32, 498 .free_ctrl = nvme_loop_free_ctrl, 499 .submit_async_event = nvme_loop_submit_async_event, 500 .delete_ctrl = nvme_loop_delete_ctrl_host, 501 .get_address = nvmf_get_address, 502 }; 503 504 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) 505 { 506 int ret; 507 508 ret = nvme_loop_init_io_queues(ctrl); 509 if (ret) 510 return ret; 511 512 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); 513 ctrl->tag_set.ops = &nvme_loop_mq_ops; 514 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; 515 ctrl->tag_set.reserved_tags = 1; /* fabric connect */ 516 ctrl->tag_set.numa_node = ctrl->ctrl.numa_node; 517 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 518 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 519 NVME_INLINE_SG_CNT * sizeof(struct scatterlist); 520 ctrl->tag_set.driver_data = ctrl; 521 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; 522 ctrl->tag_set.timeout = NVME_IO_TIMEOUT; 523 ctrl->ctrl.tagset = &ctrl->tag_set; 524 525 ret = blk_mq_alloc_tag_set(&ctrl->tag_set); 526 if (ret) 527 goto out_destroy_queues; 528 529 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); 530 if (IS_ERR(ctrl->ctrl.connect_q)) { 531 ret = PTR_ERR(ctrl->ctrl.connect_q); 532 goto out_free_tagset; 533 } 534 535 ret = nvme_loop_connect_io_queues(ctrl); 536 if (ret) 537 goto out_cleanup_connect_q; 538 539 return 0; 540 541 out_cleanup_connect_q: 542 blk_cleanup_queue(ctrl->ctrl.connect_q); 543 out_free_tagset: 544 blk_mq_free_tag_set(&ctrl->tag_set); 545 out_destroy_queues: 546 nvme_loop_destroy_io_queues(ctrl); 547 return ret; 548 } 549 550 static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) 551 { 552 struct nvmet_port *p, *found = NULL; 553 554 mutex_lock(&nvme_loop_ports_mutex); 555 list_for_each_entry(p, &nvme_loop_ports, entry) { 556 /* if no transport address is specified use the first port */ 557 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && 558 strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) 559 continue; 560 found = p; 561 break; 562 } 563 mutex_unlock(&nvme_loop_ports_mutex); 564 return found; 565 } 566 567 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 568 struct nvmf_ctrl_options *opts) 569 { 570 struct nvme_loop_ctrl *ctrl; 571 bool changed; 572 int ret; 573 574 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 575 if (!ctrl) 576 return ERR_PTR(-ENOMEM); 577 ctrl->ctrl.opts = opts; 578 INIT_LIST_HEAD(&ctrl->list); 579 580 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); 581 582 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, 583 0 /* no quirks, we're perfect! */); 584 if (ret) 585 goto out_put_ctrl; 586 587 ret = -ENOMEM; 588 589 ctrl->ctrl.sqsize = opts->queue_size - 1; 590 ctrl->ctrl.kato = opts->kato; 591 ctrl->port = nvme_loop_find_port(&ctrl->ctrl); 592 593 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), 594 GFP_KERNEL); 595 if (!ctrl->queues) 596 goto out_uninit_ctrl; 597 598 ret = nvme_loop_configure_admin_queue(ctrl); 599 if (ret) 600 goto out_free_queues; 601 602 if (opts->queue_size > ctrl->ctrl.maxcmd) { 603 /* warn if maxcmd is lower than queue_size */ 604 dev_warn(ctrl->ctrl.device, 605 "queue_size %zu > ctrl maxcmd %u, clamping down\n", 606 opts->queue_size, ctrl->ctrl.maxcmd); 607 opts->queue_size = ctrl->ctrl.maxcmd; 608 } 609 610 if (opts->nr_io_queues) { 611 ret = nvme_loop_create_io_queues(ctrl); 612 if (ret) 613 goto out_remove_admin_queue; 614 } 615 616 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); 617 618 dev_info(ctrl->ctrl.device, 619 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); 620 621 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 622 WARN_ON_ONCE(!changed); 623 624 mutex_lock(&nvme_loop_ctrl_mutex); 625 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); 626 mutex_unlock(&nvme_loop_ctrl_mutex); 627 628 nvme_start_ctrl(&ctrl->ctrl); 629 630 return &ctrl->ctrl; 631 632 out_remove_admin_queue: 633 nvme_loop_destroy_admin_queue(ctrl); 634 out_free_queues: 635 kfree(ctrl->queues); 636 out_uninit_ctrl: 637 nvme_uninit_ctrl(&ctrl->ctrl); 638 out_put_ctrl: 639 nvme_put_ctrl(&ctrl->ctrl); 640 if (ret > 0) 641 ret = -EIO; 642 return ERR_PTR(ret); 643 } 644 645 static int nvme_loop_add_port(struct nvmet_port *port) 646 { 647 mutex_lock(&nvme_loop_ports_mutex); 648 list_add_tail(&port->entry, &nvme_loop_ports); 649 mutex_unlock(&nvme_loop_ports_mutex); 650 return 0; 651 } 652 653 static void nvme_loop_remove_port(struct nvmet_port *port) 654 { 655 mutex_lock(&nvme_loop_ports_mutex); 656 list_del_init(&port->entry); 657 mutex_unlock(&nvme_loop_ports_mutex); 658 659 /* 660 * Ensure any ctrls that are in the process of being 661 * deleted are in fact deleted before we return 662 * and free the port. This is to prevent active 663 * ctrls from using a port after it's freed. 664 */ 665 flush_workqueue(nvme_delete_wq); 666 } 667 668 static const struct nvmet_fabrics_ops nvme_loop_ops = { 669 .owner = THIS_MODULE, 670 .type = NVMF_TRTYPE_LOOP, 671 .add_port = nvme_loop_add_port, 672 .remove_port = nvme_loop_remove_port, 673 .queue_response = nvme_loop_queue_response, 674 .delete_ctrl = nvme_loop_delete_ctrl, 675 }; 676 677 static struct nvmf_transport_ops nvme_loop_transport = { 678 .name = "loop", 679 .module = THIS_MODULE, 680 .create_ctrl = nvme_loop_create_ctrl, 681 .allowed_opts = NVMF_OPT_TRADDR, 682 }; 683 684 static int __init nvme_loop_init_module(void) 685 { 686 int ret; 687 688 ret = nvmet_register_transport(&nvme_loop_ops); 689 if (ret) 690 return ret; 691 692 ret = nvmf_register_transport(&nvme_loop_transport); 693 if (ret) 694 nvmet_unregister_transport(&nvme_loop_ops); 695 696 return ret; 697 } 698 699 static void __exit nvme_loop_cleanup_module(void) 700 { 701 struct nvme_loop_ctrl *ctrl, *next; 702 703 nvmf_unregister_transport(&nvme_loop_transport); 704 nvmet_unregister_transport(&nvme_loop_ops); 705 706 mutex_lock(&nvme_loop_ctrl_mutex); 707 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) 708 nvme_delete_ctrl(&ctrl->ctrl); 709 mutex_unlock(&nvme_loop_ctrl_mutex); 710 711 flush_workqueue(nvme_delete_wq); 712 } 713 714 module_init(nvme_loop_init_module); 715 module_exit(nvme_loop_cleanup_module); 716 717 MODULE_LICENSE("GPL v2"); 718 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ 719