1 /* 2 * NVMe over Fabrics loopback device. 3 * Copyright (c) 2015-2016 HGST, a Western Digital Company. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 */ 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 15 #include <linux/scatterlist.h> 16 #include <linux/blk-mq.h> 17 #include <linux/nvme.h> 18 #include <linux/module.h> 19 #include <linux/parser.h> 20 #include "nvmet.h" 21 #include "../host/nvme.h" 22 #include "../host/fabrics.h" 23 24 #define NVME_LOOP_MAX_SEGMENTS 256 25 26 struct nvme_loop_iod { 27 struct nvme_request nvme_req; 28 struct nvme_command cmd; 29 struct nvme_completion rsp; 30 struct nvmet_req req; 31 struct nvme_loop_queue *queue; 32 struct work_struct work; 33 struct sg_table sg_table; 34 struct scatterlist first_sgl[]; 35 }; 36 37 struct nvme_loop_ctrl { 38 struct nvme_loop_queue *queues; 39 40 struct blk_mq_tag_set admin_tag_set; 41 42 struct list_head list; 43 struct blk_mq_tag_set tag_set; 44 struct nvme_loop_iod async_event_iod; 45 struct nvme_ctrl ctrl; 46 47 struct nvmet_ctrl *target_ctrl; 48 }; 49 50 static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) 51 { 52 return container_of(ctrl, struct nvme_loop_ctrl, ctrl); 53 } 54 55 enum nvme_loop_queue_flags { 56 NVME_LOOP_Q_LIVE = 0, 57 }; 58 59 struct nvme_loop_queue { 60 struct nvmet_cq nvme_cq; 61 struct nvmet_sq nvme_sq; 62 struct nvme_loop_ctrl *ctrl; 63 unsigned long flags; 64 }; 65 66 static struct nvmet_port *nvmet_loop_port; 67 68 static LIST_HEAD(nvme_loop_ctrl_list); 69 static DEFINE_MUTEX(nvme_loop_ctrl_mutex); 70 71 static void nvme_loop_queue_response(struct nvmet_req *nvme_req); 72 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); 73 74 static const struct nvmet_fabrics_ops nvme_loop_ops; 75 76 static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) 77 { 78 return queue - queue->ctrl->queues; 79 } 80 81 static void nvme_loop_complete_rq(struct request *req) 82 { 83 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 84 85 nvme_cleanup_cmd(req); 86 sg_free_table_chained(&iod->sg_table, true); 87 nvme_complete_rq(req); 88 } 89 90 static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) 91 { 92 u32 queue_idx = nvme_loop_queue_idx(queue); 93 94 if (queue_idx == 0) 95 return queue->ctrl->admin_tag_set.tags[queue_idx]; 96 return queue->ctrl->tag_set.tags[queue_idx - 1]; 97 } 98 99 static void nvme_loop_queue_response(struct nvmet_req *req) 100 { 101 struct nvme_loop_queue *queue = 102 container_of(req->sq, struct nvme_loop_queue, nvme_sq); 103 struct nvme_completion *cqe = req->rsp; 104 105 /* 106 * AEN requests are special as they don't time out and can 107 * survive any kind of queue freeze and often don't respond to 108 * aborts. We don't even bother to allocate a struct request 109 * for them but rather special case them here. 110 */ 111 if (unlikely(nvme_loop_queue_idx(queue) == 0 && 112 cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { 113 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, 114 &cqe->result); 115 } else { 116 struct request *rq; 117 118 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); 119 if (!rq) { 120 dev_err(queue->ctrl->ctrl.device, 121 "tag 0x%x on queue %d not found\n", 122 cqe->command_id, nvme_loop_queue_idx(queue)); 123 return; 124 } 125 126 nvme_end_request(rq, cqe->status, cqe->result); 127 } 128 } 129 130 static void nvme_loop_execute_work(struct work_struct *work) 131 { 132 struct nvme_loop_iod *iod = 133 container_of(work, struct nvme_loop_iod, work); 134 135 nvmet_req_execute(&iod->req); 136 } 137 138 static enum blk_eh_timer_return 139 nvme_loop_timeout(struct request *rq, bool reserved) 140 { 141 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq); 142 143 /* queue error recovery */ 144 nvme_reset_ctrl(&iod->queue->ctrl->ctrl); 145 146 /* fail with DNR on admin cmd timeout */ 147 nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR; 148 149 return BLK_EH_HANDLED; 150 } 151 152 static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, 153 const struct blk_mq_queue_data *bd) 154 { 155 struct nvme_ns *ns = hctx->queue->queuedata; 156 struct nvme_loop_queue *queue = hctx->driver_data; 157 struct request *req = bd->rq; 158 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 159 blk_status_t ret; 160 161 ret = nvmf_check_if_ready(&queue->ctrl->ctrl, req, 162 test_bit(NVME_LOOP_Q_LIVE, &queue->flags), true); 163 if (unlikely(ret)) 164 return ret; 165 166 ret = nvme_setup_cmd(ns, req, &iod->cmd); 167 if (ret) 168 return ret; 169 170 blk_mq_start_request(req); 171 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 172 iod->req.port = nvmet_loop_port; 173 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, 174 &queue->nvme_sq, &nvme_loop_ops)) 175 return BLK_STS_OK; 176 177 if (blk_rq_payload_bytes(req)) { 178 iod->sg_table.sgl = iod->first_sgl; 179 if (sg_alloc_table_chained(&iod->sg_table, 180 blk_rq_nr_phys_segments(req), 181 iod->sg_table.sgl)) 182 return BLK_STS_RESOURCE; 183 184 iod->req.sg = iod->sg_table.sgl; 185 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); 186 iod->req.transfer_len = blk_rq_payload_bytes(req); 187 } 188 189 schedule_work(&iod->work); 190 return BLK_STS_OK; 191 } 192 193 static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) 194 { 195 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); 196 struct nvme_loop_queue *queue = &ctrl->queues[0]; 197 struct nvme_loop_iod *iod = &ctrl->async_event_iod; 198 199 memset(&iod->cmd, 0, sizeof(iod->cmd)); 200 iod->cmd.common.opcode = nvme_admin_async_event; 201 iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; 202 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 203 204 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, 205 &nvme_loop_ops)) { 206 dev_err(ctrl->ctrl.device, "failed async event work\n"); 207 return; 208 } 209 210 schedule_work(&iod->work); 211 } 212 213 static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, 214 struct nvme_loop_iod *iod, unsigned int queue_idx) 215 { 216 iod->req.cmd = &iod->cmd; 217 iod->req.rsp = &iod->rsp; 218 iod->queue = &ctrl->queues[queue_idx]; 219 INIT_WORK(&iod->work, nvme_loop_execute_work); 220 return 0; 221 } 222 223 static int nvme_loop_init_request(struct blk_mq_tag_set *set, 224 struct request *req, unsigned int hctx_idx, 225 unsigned int numa_node) 226 { 227 struct nvme_loop_ctrl *ctrl = set->driver_data; 228 229 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), 230 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); 231 } 232 233 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 234 unsigned int hctx_idx) 235 { 236 struct nvme_loop_ctrl *ctrl = data; 237 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; 238 239 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); 240 241 hctx->driver_data = queue; 242 return 0; 243 } 244 245 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, 246 unsigned int hctx_idx) 247 { 248 struct nvme_loop_ctrl *ctrl = data; 249 struct nvme_loop_queue *queue = &ctrl->queues[0]; 250 251 BUG_ON(hctx_idx != 0); 252 253 hctx->driver_data = queue; 254 return 0; 255 } 256 257 static const struct blk_mq_ops nvme_loop_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_hctx, 262 .timeout = nvme_loop_timeout, 263 }; 264 265 static const struct blk_mq_ops nvme_loop_admin_mq_ops = { 266 .queue_rq = nvme_loop_queue_rq, 267 .complete = nvme_loop_complete_rq, 268 .init_request = nvme_loop_init_request, 269 .init_hctx = nvme_loop_init_admin_hctx, 270 .timeout = nvme_loop_timeout, 271 }; 272 273 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) 274 { 275 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 276 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 277 blk_cleanup_queue(ctrl->ctrl.admin_q); 278 blk_mq_free_tag_set(&ctrl->admin_tag_set); 279 } 280 281 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) 282 { 283 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); 284 285 if (list_empty(&ctrl->list)) 286 goto free_ctrl; 287 288 mutex_lock(&nvme_loop_ctrl_mutex); 289 list_del(&ctrl->list); 290 mutex_unlock(&nvme_loop_ctrl_mutex); 291 292 if (nctrl->tagset) { 293 blk_cleanup_queue(ctrl->ctrl.connect_q); 294 blk_mq_free_tag_set(&ctrl->tag_set); 295 } 296 kfree(ctrl->queues); 297 nvmf_free_options(nctrl->opts); 298 free_ctrl: 299 kfree(ctrl); 300 } 301 302 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) 303 { 304 int i; 305 306 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 307 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 308 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); 309 } 310 } 311 312 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) 313 { 314 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; 315 unsigned int nr_io_queues; 316 int ret, i; 317 318 nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); 319 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); 320 if (ret || !nr_io_queues) 321 return ret; 322 323 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); 324 325 for (i = 1; i <= nr_io_queues; i++) { 326 ctrl->queues[i].ctrl = ctrl; 327 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); 328 if (ret) 329 goto out_destroy_queues; 330 331 ctrl->ctrl.queue_count++; 332 } 333 334 return 0; 335 336 out_destroy_queues: 337 nvme_loop_destroy_io_queues(ctrl); 338 return ret; 339 } 340 341 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) 342 { 343 int i, ret; 344 345 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 346 ret = nvmf_connect_io_queue(&ctrl->ctrl, i); 347 if (ret) 348 return ret; 349 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 350 } 351 352 return 0; 353 } 354 355 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) 356 { 357 int error; 358 359 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); 360 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; 361 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 362 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ 363 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; 364 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 365 SG_CHUNK_SIZE * sizeof(struct scatterlist); 366 ctrl->admin_tag_set.driver_data = ctrl; 367 ctrl->admin_tag_set.nr_hw_queues = 1; 368 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; 369 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; 370 371 ctrl->queues[0].ctrl = ctrl; 372 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); 373 if (error) 374 return error; 375 ctrl->ctrl.queue_count = 1; 376 377 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); 378 if (error) 379 goto out_free_sq; 380 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; 381 382 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); 383 if (IS_ERR(ctrl->ctrl.admin_q)) { 384 error = PTR_ERR(ctrl->ctrl.admin_q); 385 goto out_free_tagset; 386 } 387 388 error = nvmf_connect_admin_queue(&ctrl->ctrl); 389 if (error) 390 goto out_cleanup_queue; 391 392 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 393 394 error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); 395 if (error) { 396 dev_err(ctrl->ctrl.device, 397 "prop_get NVME_REG_CAP failed\n"); 398 goto out_cleanup_queue; 399 } 400 401 ctrl->ctrl.sqsize = 402 min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); 403 404 error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); 405 if (error) 406 goto out_cleanup_queue; 407 408 ctrl->ctrl.max_hw_sectors = 409 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); 410 411 error = nvme_init_identify(&ctrl->ctrl); 412 if (error) 413 goto out_cleanup_queue; 414 415 return 0; 416 417 out_cleanup_queue: 418 blk_cleanup_queue(ctrl->ctrl.admin_q); 419 out_free_tagset: 420 blk_mq_free_tag_set(&ctrl->admin_tag_set); 421 out_free_sq: 422 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 423 return error; 424 } 425 426 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) 427 { 428 if (ctrl->ctrl.queue_count > 1) { 429 nvme_stop_queues(&ctrl->ctrl); 430 blk_mq_tagset_busy_iter(&ctrl->tag_set, 431 nvme_cancel_request, &ctrl->ctrl); 432 nvme_loop_destroy_io_queues(ctrl); 433 } 434 435 if (ctrl->ctrl.state == NVME_CTRL_LIVE) 436 nvme_shutdown_ctrl(&ctrl->ctrl); 437 438 blk_mq_quiesce_queue(ctrl->ctrl.admin_q); 439 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, 440 nvme_cancel_request, &ctrl->ctrl); 441 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); 442 nvme_loop_destroy_admin_queue(ctrl); 443 } 444 445 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) 446 { 447 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); 448 } 449 450 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) 451 { 452 struct nvme_loop_ctrl *ctrl; 453 454 mutex_lock(&nvme_loop_ctrl_mutex); 455 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { 456 if (ctrl->ctrl.cntlid == nctrl->cntlid) 457 nvme_delete_ctrl(&ctrl->ctrl); 458 } 459 mutex_unlock(&nvme_loop_ctrl_mutex); 460 } 461 462 static void nvme_loop_reset_ctrl_work(struct work_struct *work) 463 { 464 struct nvme_loop_ctrl *ctrl = 465 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); 466 bool changed; 467 int ret; 468 469 nvme_stop_ctrl(&ctrl->ctrl); 470 nvme_loop_shutdown_ctrl(ctrl); 471 472 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { 473 /* state change failure should never happen */ 474 WARN_ON_ONCE(1); 475 return; 476 } 477 478 ret = nvme_loop_configure_admin_queue(ctrl); 479 if (ret) 480 goto out_disable; 481 482 ret = nvme_loop_init_io_queues(ctrl); 483 if (ret) 484 goto out_destroy_admin; 485 486 ret = nvme_loop_connect_io_queues(ctrl); 487 if (ret) 488 goto out_destroy_io; 489 490 blk_mq_update_nr_hw_queues(&ctrl->tag_set, 491 ctrl->ctrl.queue_count - 1); 492 493 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 494 WARN_ON_ONCE(!changed); 495 496 nvme_start_ctrl(&ctrl->ctrl); 497 498 return; 499 500 out_destroy_io: 501 nvme_loop_destroy_io_queues(ctrl); 502 out_destroy_admin: 503 nvme_loop_destroy_admin_queue(ctrl); 504 out_disable: 505 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); 506 nvme_uninit_ctrl(&ctrl->ctrl); 507 nvme_put_ctrl(&ctrl->ctrl); 508 } 509 510 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { 511 .name = "loop", 512 .module = THIS_MODULE, 513 .flags = NVME_F_FABRICS, 514 .reg_read32 = nvmf_reg_read32, 515 .reg_read64 = nvmf_reg_read64, 516 .reg_write32 = nvmf_reg_write32, 517 .free_ctrl = nvme_loop_free_ctrl, 518 .submit_async_event = nvme_loop_submit_async_event, 519 .delete_ctrl = nvme_loop_delete_ctrl_host, 520 }; 521 522 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) 523 { 524 int ret; 525 526 ret = nvme_loop_init_io_queues(ctrl); 527 if (ret) 528 return ret; 529 530 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); 531 ctrl->tag_set.ops = &nvme_loop_mq_ops; 532 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; 533 ctrl->tag_set.reserved_tags = 1; /* fabric connect */ 534 ctrl->tag_set.numa_node = NUMA_NO_NODE; 535 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 536 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 537 SG_CHUNK_SIZE * sizeof(struct scatterlist); 538 ctrl->tag_set.driver_data = ctrl; 539 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; 540 ctrl->tag_set.timeout = NVME_IO_TIMEOUT; 541 ctrl->ctrl.tagset = &ctrl->tag_set; 542 543 ret = blk_mq_alloc_tag_set(&ctrl->tag_set); 544 if (ret) 545 goto out_destroy_queues; 546 547 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); 548 if (IS_ERR(ctrl->ctrl.connect_q)) { 549 ret = PTR_ERR(ctrl->ctrl.connect_q); 550 goto out_free_tagset; 551 } 552 553 ret = nvme_loop_connect_io_queues(ctrl); 554 if (ret) 555 goto out_cleanup_connect_q; 556 557 return 0; 558 559 out_cleanup_connect_q: 560 blk_cleanup_queue(ctrl->ctrl.connect_q); 561 out_free_tagset: 562 blk_mq_free_tag_set(&ctrl->tag_set); 563 out_destroy_queues: 564 nvme_loop_destroy_io_queues(ctrl); 565 return ret; 566 } 567 568 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 569 struct nvmf_ctrl_options *opts) 570 { 571 struct nvme_loop_ctrl *ctrl; 572 bool changed; 573 int ret; 574 575 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 576 if (!ctrl) 577 return ERR_PTR(-ENOMEM); 578 ctrl->ctrl.opts = opts; 579 INIT_LIST_HEAD(&ctrl->list); 580 581 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); 582 583 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, 584 0 /* no quirks, we're perfect! */); 585 if (ret) 586 goto out_put_ctrl; 587 588 ret = -ENOMEM; 589 590 ctrl->ctrl.sqsize = opts->queue_size - 1; 591 ctrl->ctrl.kato = opts->kato; 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 nvme_get_ctrl(&ctrl->ctrl); 622 623 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 624 WARN_ON_ONCE(!changed); 625 626 mutex_lock(&nvme_loop_ctrl_mutex); 627 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); 628 mutex_unlock(&nvme_loop_ctrl_mutex); 629 630 nvme_start_ctrl(&ctrl->ctrl); 631 632 return &ctrl->ctrl; 633 634 out_remove_admin_queue: 635 nvme_loop_destroy_admin_queue(ctrl); 636 out_free_queues: 637 kfree(ctrl->queues); 638 out_uninit_ctrl: 639 nvme_uninit_ctrl(&ctrl->ctrl); 640 out_put_ctrl: 641 nvme_put_ctrl(&ctrl->ctrl); 642 if (ret > 0) 643 ret = -EIO; 644 return ERR_PTR(ret); 645 } 646 647 static int nvme_loop_add_port(struct nvmet_port *port) 648 { 649 /* 650 * XXX: disalow adding more than one port so 651 * there is no connection rejections when a 652 * a subsystem is assigned to a port for which 653 * loop doesn't have a pointer. 654 * This scenario would be possible if we allowed 655 * more than one port to be added and a subsystem 656 * was assigned to a port other than nvmet_loop_port. 657 */ 658 659 if (nvmet_loop_port) 660 return -EPERM; 661 662 nvmet_loop_port = port; 663 return 0; 664 } 665 666 static void nvme_loop_remove_port(struct nvmet_port *port) 667 { 668 if (port == nvmet_loop_port) 669 nvmet_loop_port = NULL; 670 } 671 672 static const struct nvmet_fabrics_ops nvme_loop_ops = { 673 .owner = THIS_MODULE, 674 .type = NVMF_TRTYPE_LOOP, 675 .add_port = nvme_loop_add_port, 676 .remove_port = nvme_loop_remove_port, 677 .queue_response = nvme_loop_queue_response, 678 .delete_ctrl = nvme_loop_delete_ctrl, 679 }; 680 681 static struct nvmf_transport_ops nvme_loop_transport = { 682 .name = "loop", 683 .module = THIS_MODULE, 684 .create_ctrl = nvme_loop_create_ctrl, 685 }; 686 687 static int __init nvme_loop_init_module(void) 688 { 689 int ret; 690 691 ret = nvmet_register_transport(&nvme_loop_ops); 692 if (ret) 693 return ret; 694 695 ret = nvmf_register_transport(&nvme_loop_transport); 696 if (ret) 697 nvmet_unregister_transport(&nvme_loop_ops); 698 699 return ret; 700 } 701 702 static void __exit nvme_loop_cleanup_module(void) 703 { 704 struct nvme_loop_ctrl *ctrl, *next; 705 706 nvmf_unregister_transport(&nvme_loop_transport); 707 nvmet_unregister_transport(&nvme_loop_ops); 708 709 mutex_lock(&nvme_loop_ctrl_mutex); 710 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) 711 nvme_delete_ctrl(&ctrl->ctrl); 712 mutex_unlock(&nvme_loop_ctrl_mutex); 713 714 flush_workqueue(nvme_delete_wq); 715 } 716 717 module_init(nvme_loop_init_module); 718 module_exit(nvme_loop_cleanup_module); 719 720 MODULE_LICENSE("GPL v2"); 721 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ 722