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 nvme_cleanup_cmd(req); 80 sg_free_table_chained(&iod->sg_table, SG_CHUNK_SIZE); 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->cqe; 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 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, SG_CHUNK_SIZE)) 161 return BLK_STS_RESOURCE; 162 163 iod->req.sg = iod->sg_table.sgl; 164 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); 165 iod->req.transfer_len = blk_rq_payload_bytes(req); 166 } 167 168 schedule_work(&iod->work); 169 return BLK_STS_OK; 170 } 171 172 static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) 173 { 174 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); 175 struct nvme_loop_queue *queue = &ctrl->queues[0]; 176 struct nvme_loop_iod *iod = &ctrl->async_event_iod; 177 178 memset(&iod->cmd, 0, sizeof(iod->cmd)); 179 iod->cmd.common.opcode = nvme_admin_async_event; 180 iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; 181 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 182 183 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, 184 &nvme_loop_ops)) { 185 dev_err(ctrl->ctrl.device, "failed async event work\n"); 186 return; 187 } 188 189 schedule_work(&iod->work); 190 } 191 192 static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, 193 struct nvme_loop_iod *iod, unsigned int queue_idx) 194 { 195 iod->req.cmd = &iod->cmd; 196 iod->req.cqe = &iod->cqe; 197 iod->queue = &ctrl->queues[queue_idx]; 198 INIT_WORK(&iod->work, nvme_loop_execute_work); 199 return 0; 200 } 201 202 static int nvme_loop_init_request(struct blk_mq_tag_set *set, 203 struct request *req, unsigned int hctx_idx, 204 unsigned int numa_node) 205 { 206 struct nvme_loop_ctrl *ctrl = set->driver_data; 207 208 nvme_req(req)->ctrl = &ctrl->ctrl; 209 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), 210 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); 211 } 212 213 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 214 unsigned int hctx_idx) 215 { 216 struct nvme_loop_ctrl *ctrl = data; 217 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; 218 219 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); 220 221 hctx->driver_data = queue; 222 return 0; 223 } 224 225 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, 226 unsigned int hctx_idx) 227 { 228 struct nvme_loop_ctrl *ctrl = data; 229 struct nvme_loop_queue *queue = &ctrl->queues[0]; 230 231 BUG_ON(hctx_idx != 0); 232 233 hctx->driver_data = queue; 234 return 0; 235 } 236 237 static const struct blk_mq_ops nvme_loop_mq_ops = { 238 .queue_rq = nvme_loop_queue_rq, 239 .complete = nvme_loop_complete_rq, 240 .init_request = nvme_loop_init_request, 241 .init_hctx = nvme_loop_init_hctx, 242 }; 243 244 static const struct blk_mq_ops nvme_loop_admin_mq_ops = { 245 .queue_rq = nvme_loop_queue_rq, 246 .complete = nvme_loop_complete_rq, 247 .init_request = nvme_loop_init_request, 248 .init_hctx = nvme_loop_init_admin_hctx, 249 }; 250 251 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) 252 { 253 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 254 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 255 blk_cleanup_queue(ctrl->ctrl.admin_q); 256 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 257 blk_mq_free_tag_set(&ctrl->admin_tag_set); 258 } 259 260 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) 261 { 262 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); 263 264 if (list_empty(&ctrl->list)) 265 goto free_ctrl; 266 267 mutex_lock(&nvme_loop_ctrl_mutex); 268 list_del(&ctrl->list); 269 mutex_unlock(&nvme_loop_ctrl_mutex); 270 271 if (nctrl->tagset) { 272 blk_cleanup_queue(ctrl->ctrl.connect_q); 273 blk_mq_free_tag_set(&ctrl->tag_set); 274 } 275 kfree(ctrl->queues); 276 nvmf_free_options(nctrl->opts); 277 free_ctrl: 278 kfree(ctrl); 279 } 280 281 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) 282 { 283 int i; 284 285 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 286 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 287 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); 288 } 289 } 290 291 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) 292 { 293 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; 294 unsigned int nr_io_queues; 295 int ret, i; 296 297 nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); 298 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); 299 if (ret || !nr_io_queues) 300 return ret; 301 302 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); 303 304 for (i = 1; i <= nr_io_queues; i++) { 305 ctrl->queues[i].ctrl = ctrl; 306 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); 307 if (ret) 308 goto out_destroy_queues; 309 310 ctrl->ctrl.queue_count++; 311 } 312 313 return 0; 314 315 out_destroy_queues: 316 nvme_loop_destroy_io_queues(ctrl); 317 return ret; 318 } 319 320 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) 321 { 322 int i, ret; 323 324 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 325 ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false); 326 if (ret) 327 return ret; 328 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 329 } 330 331 return 0; 332 } 333 334 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) 335 { 336 int error; 337 338 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); 339 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; 340 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 341 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ 342 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; 343 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 344 SG_CHUNK_SIZE * sizeof(struct scatterlist); 345 ctrl->admin_tag_set.driver_data = ctrl; 346 ctrl->admin_tag_set.nr_hw_queues = 1; 347 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; 348 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; 349 350 ctrl->queues[0].ctrl = ctrl; 351 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); 352 if (error) 353 return error; 354 ctrl->ctrl.queue_count = 1; 355 356 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); 357 if (error) 358 goto out_free_sq; 359 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; 360 361 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set); 362 if (IS_ERR(ctrl->ctrl.fabrics_q)) { 363 error = PTR_ERR(ctrl->ctrl.fabrics_q); 364 goto out_free_tagset; 365 } 366 367 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); 368 if (IS_ERR(ctrl->ctrl.admin_q)) { 369 error = PTR_ERR(ctrl->ctrl.admin_q); 370 goto out_cleanup_fabrics_q; 371 } 372 373 error = nvmf_connect_admin_queue(&ctrl->ctrl); 374 if (error) 375 goto out_cleanup_queue; 376 377 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 378 379 error = nvme_enable_ctrl(&ctrl->ctrl); 380 if (error) 381 goto out_cleanup_queue; 382 383 ctrl->ctrl.max_hw_sectors = 384 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); 385 386 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); 387 388 error = nvme_init_identify(&ctrl->ctrl); 389 if (error) 390 goto out_cleanup_queue; 391 392 return 0; 393 394 out_cleanup_queue: 395 blk_cleanup_queue(ctrl->ctrl.admin_q); 396 out_cleanup_fabrics_q: 397 blk_cleanup_queue(ctrl->ctrl.fabrics_q); 398 out_free_tagset: 399 blk_mq_free_tag_set(&ctrl->admin_tag_set); 400 out_free_sq: 401 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 402 return error; 403 } 404 405 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) 406 { 407 if (ctrl->ctrl.queue_count > 1) { 408 nvme_stop_queues(&ctrl->ctrl); 409 blk_mq_tagset_busy_iter(&ctrl->tag_set, 410 nvme_cancel_request, &ctrl->ctrl); 411 blk_mq_tagset_wait_completed_request(&ctrl->tag_set); 412 nvme_loop_destroy_io_queues(ctrl); 413 } 414 415 blk_mq_quiesce_queue(ctrl->ctrl.admin_q); 416 if (ctrl->ctrl.state == NVME_CTRL_LIVE) 417 nvme_shutdown_ctrl(&ctrl->ctrl); 418 419 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, 420 nvme_cancel_request, &ctrl->ctrl); 421 blk_mq_tagset_wait_completed_request(&ctrl->admin_tag_set); 422 nvme_loop_destroy_admin_queue(ctrl); 423 } 424 425 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) 426 { 427 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); 428 } 429 430 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) 431 { 432 struct nvme_loop_ctrl *ctrl; 433 434 mutex_lock(&nvme_loop_ctrl_mutex); 435 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { 436 if (ctrl->ctrl.cntlid == nctrl->cntlid) 437 nvme_delete_ctrl(&ctrl->ctrl); 438 } 439 mutex_unlock(&nvme_loop_ctrl_mutex); 440 } 441 442 static void nvme_loop_reset_ctrl_work(struct work_struct *work) 443 { 444 struct nvme_loop_ctrl *ctrl = 445 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); 446 bool changed; 447 int ret; 448 449 nvme_stop_ctrl(&ctrl->ctrl); 450 nvme_loop_shutdown_ctrl(ctrl); 451 452 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { 453 /* state change failure should never happen */ 454 WARN_ON_ONCE(1); 455 return; 456 } 457 458 ret = nvme_loop_configure_admin_queue(ctrl); 459 if (ret) 460 goto out_disable; 461 462 ret = nvme_loop_init_io_queues(ctrl); 463 if (ret) 464 goto out_destroy_admin; 465 466 ret = nvme_loop_connect_io_queues(ctrl); 467 if (ret) 468 goto out_destroy_io; 469 470 blk_mq_update_nr_hw_queues(&ctrl->tag_set, 471 ctrl->ctrl.queue_count - 1); 472 473 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 474 WARN_ON_ONCE(!changed); 475 476 nvme_start_ctrl(&ctrl->ctrl); 477 478 return; 479 480 out_destroy_io: 481 nvme_loop_destroy_io_queues(ctrl); 482 out_destroy_admin: 483 nvme_loop_destroy_admin_queue(ctrl); 484 out_disable: 485 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); 486 nvme_uninit_ctrl(&ctrl->ctrl); 487 nvme_put_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 = NUMA_NO_NODE; 516 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 517 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 518 SG_CHUNK_SIZE * 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 nvme_get_ctrl(&ctrl->ctrl); 621 622 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 623 WARN_ON_ONCE(!changed); 624 625 mutex_lock(&nvme_loop_ctrl_mutex); 626 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); 627 mutex_unlock(&nvme_loop_ctrl_mutex); 628 629 nvme_start_ctrl(&ctrl->ctrl); 630 631 return &ctrl->ctrl; 632 633 out_remove_admin_queue: 634 nvme_loop_destroy_admin_queue(ctrl); 635 out_free_queues: 636 kfree(ctrl->queues); 637 out_uninit_ctrl: 638 nvme_uninit_ctrl(&ctrl->ctrl); 639 out_put_ctrl: 640 nvme_put_ctrl(&ctrl->ctrl); 641 if (ret > 0) 642 ret = -EIO; 643 return ERR_PTR(ret); 644 } 645 646 static int nvme_loop_add_port(struct nvmet_port *port) 647 { 648 mutex_lock(&nvme_loop_ports_mutex); 649 list_add_tail(&port->entry, &nvme_loop_ports); 650 mutex_unlock(&nvme_loop_ports_mutex); 651 return 0; 652 } 653 654 static void nvme_loop_remove_port(struct nvmet_port *port) 655 { 656 mutex_lock(&nvme_loop_ports_mutex); 657 list_del_init(&port->entry); 658 mutex_unlock(&nvme_loop_ports_mutex); 659 660 /* 661 * Ensure any ctrls that are in the process of being 662 * deleted are in fact deleted before we return 663 * and free the port. This is to prevent active 664 * ctrls from using a port after it's freed. 665 */ 666 flush_workqueue(nvme_delete_wq); 667 } 668 669 static const struct nvmet_fabrics_ops nvme_loop_ops = { 670 .owner = THIS_MODULE, 671 .type = NVMF_TRTYPE_LOOP, 672 .add_port = nvme_loop_add_port, 673 .remove_port = nvme_loop_remove_port, 674 .queue_response = nvme_loop_queue_response, 675 .delete_ctrl = nvme_loop_delete_ctrl, 676 }; 677 678 static struct nvmf_transport_ops nvme_loop_transport = { 679 .name = "loop", 680 .module = THIS_MODULE, 681 .create_ctrl = nvme_loop_create_ctrl, 682 .allowed_opts = NVMF_OPT_TRADDR, 683 }; 684 685 static int __init nvme_loop_init_module(void) 686 { 687 int ret; 688 689 ret = nvmet_register_transport(&nvme_loop_ops); 690 if (ret) 691 return ret; 692 693 ret = nvmf_register_transport(&nvme_loop_transport); 694 if (ret) 695 nvmet_unregister_transport(&nvme_loop_ops); 696 697 return ret; 698 } 699 700 static void __exit nvme_loop_cleanup_module(void) 701 { 702 struct nvme_loop_ctrl *ctrl, *next; 703 704 nvmf_unregister_transport(&nvme_loop_transport); 705 nvmet_unregister_transport(&nvme_loop_ops); 706 707 mutex_lock(&nvme_loop_ctrl_mutex); 708 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) 709 nvme_delete_ctrl(&ctrl->ctrl); 710 mutex_unlock(&nvme_loop_ctrl_mutex); 711 712 flush_workqueue(nvme_delete_wq); 713 } 714 715 module_init(nvme_loop_init_module); 716 module_exit(nvme_loop_cleanup_module); 717 718 MODULE_LICENSE("GPL v2"); 719 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ 720