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 struct nvmet_port *port; 49 }; 50 51 static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) 52 { 53 return container_of(ctrl, struct nvme_loop_ctrl, ctrl); 54 } 55 56 enum nvme_loop_queue_flags { 57 NVME_LOOP_Q_LIVE = 0, 58 }; 59 60 struct nvme_loop_queue { 61 struct nvmet_cq nvme_cq; 62 struct nvmet_sq nvme_sq; 63 struct nvme_loop_ctrl *ctrl; 64 unsigned long flags; 65 }; 66 67 static LIST_HEAD(nvme_loop_ports); 68 static DEFINE_MUTEX(nvme_loop_ports_mutex); 69 70 static LIST_HEAD(nvme_loop_ctrl_list); 71 static DEFINE_MUTEX(nvme_loop_ctrl_mutex); 72 73 static void nvme_loop_queue_response(struct nvmet_req *nvme_req); 74 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); 75 76 static const struct nvmet_fabrics_ops nvme_loop_ops; 77 78 static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) 79 { 80 return queue - queue->ctrl->queues; 81 } 82 83 static void nvme_loop_complete_rq(struct request *req) 84 { 85 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 86 87 nvme_cleanup_cmd(req); 88 sg_free_table_chained(&iod->sg_table, true); 89 nvme_complete_rq(req); 90 } 91 92 static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) 93 { 94 u32 queue_idx = nvme_loop_queue_idx(queue); 95 96 if (queue_idx == 0) 97 return queue->ctrl->admin_tag_set.tags[queue_idx]; 98 return queue->ctrl->tag_set.tags[queue_idx - 1]; 99 } 100 101 static void nvme_loop_queue_response(struct nvmet_req *req) 102 { 103 struct nvme_loop_queue *queue = 104 container_of(req->sq, struct nvme_loop_queue, nvme_sq); 105 struct nvme_completion *cqe = req->rsp; 106 107 /* 108 * AEN requests are special as they don't time out and can 109 * survive any kind of queue freeze and often don't respond to 110 * aborts. We don't even bother to allocate a struct request 111 * for them but rather special case them here. 112 */ 113 if (unlikely(nvme_loop_queue_idx(queue) == 0 && 114 cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { 115 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, 116 &cqe->result); 117 } else { 118 struct request *rq; 119 120 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); 121 if (!rq) { 122 dev_err(queue->ctrl->ctrl.device, 123 "tag 0x%x on queue %d not found\n", 124 cqe->command_id, nvme_loop_queue_idx(queue)); 125 return; 126 } 127 128 nvme_end_request(rq, cqe->status, cqe->result); 129 } 130 } 131 132 static void nvme_loop_execute_work(struct work_struct *work) 133 { 134 struct nvme_loop_iod *iod = 135 container_of(work, struct nvme_loop_iod, work); 136 137 nvmet_req_execute(&iod->req); 138 } 139 140 static enum blk_eh_timer_return 141 nvme_loop_timeout(struct request *rq, bool reserved) 142 { 143 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq); 144 145 /* queue error recovery */ 146 nvme_reset_ctrl(&iod->queue->ctrl->ctrl); 147 148 /* fail with DNR on admin cmd timeout */ 149 nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR; 150 151 return BLK_EH_DONE; 152 } 153 154 static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, 155 const struct blk_mq_queue_data *bd) 156 { 157 struct nvme_ns *ns = hctx->queue->queuedata; 158 struct nvme_loop_queue *queue = hctx->driver_data; 159 struct request *req = bd->rq; 160 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); 161 bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags); 162 blk_status_t ret; 163 164 if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready)) 165 return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req); 166 167 ret = nvme_setup_cmd(ns, req, &iod->cmd); 168 if (ret) 169 return ret; 170 171 blk_mq_start_request(req); 172 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 173 iod->req.port = queue->ctrl->port; 174 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, 175 &queue->nvme_sq, &nvme_loop_ops)) 176 return BLK_STS_OK; 177 178 if (blk_rq_nr_phys_segments(req)) { 179 iod->sg_table.sgl = iod->first_sgl; 180 if (sg_alloc_table_chained(&iod->sg_table, 181 blk_rq_nr_phys_segments(req), 182 iod->sg_table.sgl)) 183 return BLK_STS_RESOURCE; 184 185 iod->req.sg = iod->sg_table.sgl; 186 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); 187 iod->req.transfer_len = blk_rq_payload_bytes(req); 188 } 189 190 schedule_work(&iod->work); 191 return BLK_STS_OK; 192 } 193 194 static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) 195 { 196 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); 197 struct nvme_loop_queue *queue = &ctrl->queues[0]; 198 struct nvme_loop_iod *iod = &ctrl->async_event_iod; 199 200 memset(&iod->cmd, 0, sizeof(iod->cmd)); 201 iod->cmd.common.opcode = nvme_admin_async_event; 202 iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; 203 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; 204 205 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, 206 &nvme_loop_ops)) { 207 dev_err(ctrl->ctrl.device, "failed async event work\n"); 208 return; 209 } 210 211 schedule_work(&iod->work); 212 } 213 214 static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, 215 struct nvme_loop_iod *iod, unsigned int queue_idx) 216 { 217 iod->req.cmd = &iod->cmd; 218 iod->req.rsp = &iod->rsp; 219 iod->queue = &ctrl->queues[queue_idx]; 220 INIT_WORK(&iod->work, nvme_loop_execute_work); 221 return 0; 222 } 223 224 static int nvme_loop_init_request(struct blk_mq_tag_set *set, 225 struct request *req, unsigned int hctx_idx, 226 unsigned int numa_node) 227 { 228 struct nvme_loop_ctrl *ctrl = set->driver_data; 229 230 nvme_req(req)->ctrl = &ctrl->ctrl; 231 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), 232 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); 233 } 234 235 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 236 unsigned int hctx_idx) 237 { 238 struct nvme_loop_ctrl *ctrl = data; 239 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; 240 241 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); 242 243 hctx->driver_data = queue; 244 return 0; 245 } 246 247 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, 248 unsigned int hctx_idx) 249 { 250 struct nvme_loop_ctrl *ctrl = data; 251 struct nvme_loop_queue *queue = &ctrl->queues[0]; 252 253 BUG_ON(hctx_idx != 0); 254 255 hctx->driver_data = queue; 256 return 0; 257 } 258 259 static const struct blk_mq_ops nvme_loop_mq_ops = { 260 .queue_rq = nvme_loop_queue_rq, 261 .complete = nvme_loop_complete_rq, 262 .init_request = nvme_loop_init_request, 263 .init_hctx = nvme_loop_init_hctx, 264 .timeout = nvme_loop_timeout, 265 }; 266 267 static const struct blk_mq_ops nvme_loop_admin_mq_ops = { 268 .queue_rq = nvme_loop_queue_rq, 269 .complete = nvme_loop_complete_rq, 270 .init_request = nvme_loop_init_request, 271 .init_hctx = nvme_loop_init_admin_hctx, 272 .timeout = nvme_loop_timeout, 273 }; 274 275 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) 276 { 277 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 278 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 279 blk_cleanup_queue(ctrl->ctrl.admin_q); 280 blk_mq_free_tag_set(&ctrl->admin_tag_set); 281 } 282 283 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) 284 { 285 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); 286 287 if (list_empty(&ctrl->list)) 288 goto free_ctrl; 289 290 mutex_lock(&nvme_loop_ctrl_mutex); 291 list_del(&ctrl->list); 292 mutex_unlock(&nvme_loop_ctrl_mutex); 293 294 if (nctrl->tagset) { 295 blk_cleanup_queue(ctrl->ctrl.connect_q); 296 blk_mq_free_tag_set(&ctrl->tag_set); 297 } 298 kfree(ctrl->queues); 299 nvmf_free_options(nctrl->opts); 300 free_ctrl: 301 kfree(ctrl); 302 } 303 304 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) 305 { 306 int i; 307 308 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 309 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 310 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); 311 } 312 } 313 314 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) 315 { 316 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; 317 unsigned int nr_io_queues; 318 int ret, i; 319 320 nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); 321 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); 322 if (ret || !nr_io_queues) 323 return ret; 324 325 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); 326 327 for (i = 1; i <= nr_io_queues; i++) { 328 ctrl->queues[i].ctrl = ctrl; 329 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); 330 if (ret) 331 goto out_destroy_queues; 332 333 ctrl->ctrl.queue_count++; 334 } 335 336 return 0; 337 338 out_destroy_queues: 339 nvme_loop_destroy_io_queues(ctrl); 340 return ret; 341 } 342 343 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) 344 { 345 int i, ret; 346 347 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 348 ret = nvmf_connect_io_queue(&ctrl->ctrl, i); 349 if (ret) 350 return ret; 351 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 352 } 353 354 return 0; 355 } 356 357 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) 358 { 359 int error; 360 361 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); 362 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; 363 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 364 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ 365 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; 366 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 367 SG_CHUNK_SIZE * sizeof(struct scatterlist); 368 ctrl->admin_tag_set.driver_data = ctrl; 369 ctrl->admin_tag_set.nr_hw_queues = 1; 370 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; 371 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; 372 373 ctrl->queues[0].ctrl = ctrl; 374 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); 375 if (error) 376 return error; 377 ctrl->ctrl.queue_count = 1; 378 379 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); 380 if (error) 381 goto out_free_sq; 382 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; 383 384 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); 385 if (IS_ERR(ctrl->ctrl.admin_q)) { 386 error = PTR_ERR(ctrl->ctrl.admin_q); 387 goto out_free_tagset; 388 } 389 390 error = nvmf_connect_admin_queue(&ctrl->ctrl); 391 if (error) 392 goto out_cleanup_queue; 393 394 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 395 396 error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); 397 if (error) { 398 dev_err(ctrl->ctrl.device, 399 "prop_get NVME_REG_CAP failed\n"); 400 goto out_cleanup_queue; 401 } 402 403 ctrl->ctrl.sqsize = 404 min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); 405 406 error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); 407 if (error) 408 goto out_cleanup_queue; 409 410 ctrl->ctrl.max_hw_sectors = 411 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); 412 413 error = nvme_init_identify(&ctrl->ctrl); 414 if (error) 415 goto out_cleanup_queue; 416 417 return 0; 418 419 out_cleanup_queue: 420 blk_cleanup_queue(ctrl->ctrl.admin_q); 421 out_free_tagset: 422 blk_mq_free_tag_set(&ctrl->admin_tag_set); 423 out_free_sq: 424 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 425 return error; 426 } 427 428 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) 429 { 430 if (ctrl->ctrl.queue_count > 1) { 431 nvme_stop_queues(&ctrl->ctrl); 432 blk_mq_tagset_busy_iter(&ctrl->tag_set, 433 nvme_cancel_request, &ctrl->ctrl); 434 nvme_loop_destroy_io_queues(ctrl); 435 } 436 437 if (ctrl->ctrl.state == NVME_CTRL_LIVE) 438 nvme_shutdown_ctrl(&ctrl->ctrl); 439 440 blk_mq_quiesce_queue(ctrl->ctrl.admin_q); 441 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, 442 nvme_cancel_request, &ctrl->ctrl); 443 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); 444 nvme_loop_destroy_admin_queue(ctrl); 445 } 446 447 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) 448 { 449 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); 450 } 451 452 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) 453 { 454 struct nvme_loop_ctrl *ctrl; 455 456 mutex_lock(&nvme_loop_ctrl_mutex); 457 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { 458 if (ctrl->ctrl.cntlid == nctrl->cntlid) 459 nvme_delete_ctrl(&ctrl->ctrl); 460 } 461 mutex_unlock(&nvme_loop_ctrl_mutex); 462 } 463 464 static void nvme_loop_reset_ctrl_work(struct work_struct *work) 465 { 466 struct nvme_loop_ctrl *ctrl = 467 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); 468 bool changed; 469 int ret; 470 471 nvme_stop_ctrl(&ctrl->ctrl); 472 nvme_loop_shutdown_ctrl(ctrl); 473 474 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { 475 /* state change failure should never happen */ 476 WARN_ON_ONCE(1); 477 return; 478 } 479 480 ret = nvme_loop_configure_admin_queue(ctrl); 481 if (ret) 482 goto out_disable; 483 484 ret = nvme_loop_init_io_queues(ctrl); 485 if (ret) 486 goto out_destroy_admin; 487 488 ret = nvme_loop_connect_io_queues(ctrl); 489 if (ret) 490 goto out_destroy_io; 491 492 blk_mq_update_nr_hw_queues(&ctrl->tag_set, 493 ctrl->ctrl.queue_count - 1); 494 495 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 496 WARN_ON_ONCE(!changed); 497 498 nvme_start_ctrl(&ctrl->ctrl); 499 500 return; 501 502 out_destroy_io: 503 nvme_loop_destroy_io_queues(ctrl); 504 out_destroy_admin: 505 nvme_loop_destroy_admin_queue(ctrl); 506 out_disable: 507 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); 508 nvme_uninit_ctrl(&ctrl->ctrl); 509 nvme_put_ctrl(&ctrl->ctrl); 510 } 511 512 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { 513 .name = "loop", 514 .module = THIS_MODULE, 515 .flags = NVME_F_FABRICS, 516 .reg_read32 = nvmf_reg_read32, 517 .reg_read64 = nvmf_reg_read64, 518 .reg_write32 = nvmf_reg_write32, 519 .free_ctrl = nvme_loop_free_ctrl, 520 .submit_async_event = nvme_loop_submit_async_event, 521 .delete_ctrl = nvme_loop_delete_ctrl_host, 522 .get_address = nvmf_get_address, 523 }; 524 525 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) 526 { 527 int ret; 528 529 ret = nvme_loop_init_io_queues(ctrl); 530 if (ret) 531 return ret; 532 533 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); 534 ctrl->tag_set.ops = &nvme_loop_mq_ops; 535 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; 536 ctrl->tag_set.reserved_tags = 1; /* fabric connect */ 537 ctrl->tag_set.numa_node = NUMA_NO_NODE; 538 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 539 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 540 SG_CHUNK_SIZE * sizeof(struct scatterlist); 541 ctrl->tag_set.driver_data = ctrl; 542 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; 543 ctrl->tag_set.timeout = NVME_IO_TIMEOUT; 544 ctrl->ctrl.tagset = &ctrl->tag_set; 545 546 ret = blk_mq_alloc_tag_set(&ctrl->tag_set); 547 if (ret) 548 goto out_destroy_queues; 549 550 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); 551 if (IS_ERR(ctrl->ctrl.connect_q)) { 552 ret = PTR_ERR(ctrl->ctrl.connect_q); 553 goto out_free_tagset; 554 } 555 556 ret = nvme_loop_connect_io_queues(ctrl); 557 if (ret) 558 goto out_cleanup_connect_q; 559 560 return 0; 561 562 out_cleanup_connect_q: 563 blk_cleanup_queue(ctrl->ctrl.connect_q); 564 out_free_tagset: 565 blk_mq_free_tag_set(&ctrl->tag_set); 566 out_destroy_queues: 567 nvme_loop_destroy_io_queues(ctrl); 568 return ret; 569 } 570 571 static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) 572 { 573 struct nvmet_port *p, *found = NULL; 574 575 mutex_lock(&nvme_loop_ports_mutex); 576 list_for_each_entry(p, &nvme_loop_ports, entry) { 577 /* if no transport address is specified use the first port */ 578 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && 579 strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) 580 continue; 581 found = p; 582 break; 583 } 584 mutex_unlock(&nvme_loop_ports_mutex); 585 return found; 586 } 587 588 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 589 struct nvmf_ctrl_options *opts) 590 { 591 struct nvme_loop_ctrl *ctrl; 592 bool changed; 593 int ret; 594 595 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 596 if (!ctrl) 597 return ERR_PTR(-ENOMEM); 598 ctrl->ctrl.opts = opts; 599 INIT_LIST_HEAD(&ctrl->list); 600 601 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); 602 603 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, 604 0 /* no quirks, we're perfect! */); 605 if (ret) 606 goto out_put_ctrl; 607 608 ret = -ENOMEM; 609 610 ctrl->ctrl.sqsize = opts->queue_size - 1; 611 ctrl->ctrl.kato = opts->kato; 612 ctrl->port = nvme_loop_find_port(&ctrl->ctrl); 613 614 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), 615 GFP_KERNEL); 616 if (!ctrl->queues) 617 goto out_uninit_ctrl; 618 619 ret = nvme_loop_configure_admin_queue(ctrl); 620 if (ret) 621 goto out_free_queues; 622 623 if (opts->queue_size > ctrl->ctrl.maxcmd) { 624 /* warn if maxcmd is lower than queue_size */ 625 dev_warn(ctrl->ctrl.device, 626 "queue_size %zu > ctrl maxcmd %u, clamping down\n", 627 opts->queue_size, ctrl->ctrl.maxcmd); 628 opts->queue_size = ctrl->ctrl.maxcmd; 629 } 630 631 if (opts->nr_io_queues) { 632 ret = nvme_loop_create_io_queues(ctrl); 633 if (ret) 634 goto out_remove_admin_queue; 635 } 636 637 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); 638 639 dev_info(ctrl->ctrl.device, 640 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); 641 642 nvme_get_ctrl(&ctrl->ctrl); 643 644 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 645 WARN_ON_ONCE(!changed); 646 647 mutex_lock(&nvme_loop_ctrl_mutex); 648 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); 649 mutex_unlock(&nvme_loop_ctrl_mutex); 650 651 nvme_start_ctrl(&ctrl->ctrl); 652 653 return &ctrl->ctrl; 654 655 out_remove_admin_queue: 656 nvme_loop_destroy_admin_queue(ctrl); 657 out_free_queues: 658 kfree(ctrl->queues); 659 out_uninit_ctrl: 660 nvme_uninit_ctrl(&ctrl->ctrl); 661 out_put_ctrl: 662 nvme_put_ctrl(&ctrl->ctrl); 663 if (ret > 0) 664 ret = -EIO; 665 return ERR_PTR(ret); 666 } 667 668 static int nvme_loop_add_port(struct nvmet_port *port) 669 { 670 mutex_lock(&nvme_loop_ports_mutex); 671 list_add_tail(&port->entry, &nvme_loop_ports); 672 mutex_unlock(&nvme_loop_ports_mutex); 673 return 0; 674 } 675 676 static void nvme_loop_remove_port(struct nvmet_port *port) 677 { 678 mutex_lock(&nvme_loop_ports_mutex); 679 list_del_init(&port->entry); 680 mutex_unlock(&nvme_loop_ports_mutex); 681 } 682 683 static const struct nvmet_fabrics_ops nvme_loop_ops = { 684 .owner = THIS_MODULE, 685 .type = NVMF_TRTYPE_LOOP, 686 .add_port = nvme_loop_add_port, 687 .remove_port = nvme_loop_remove_port, 688 .queue_response = nvme_loop_queue_response, 689 .delete_ctrl = nvme_loop_delete_ctrl, 690 }; 691 692 static struct nvmf_transport_ops nvme_loop_transport = { 693 .name = "loop", 694 .module = THIS_MODULE, 695 .create_ctrl = nvme_loop_create_ctrl, 696 .allowed_opts = NVMF_OPT_TRADDR, 697 }; 698 699 static int __init nvme_loop_init_module(void) 700 { 701 int ret; 702 703 ret = nvmet_register_transport(&nvme_loop_ops); 704 if (ret) 705 return ret; 706 707 ret = nvmf_register_transport(&nvme_loop_transport); 708 if (ret) 709 nvmet_unregister_transport(&nvme_loop_ops); 710 711 return ret; 712 } 713 714 static void __exit nvme_loop_cleanup_module(void) 715 { 716 struct nvme_loop_ctrl *ctrl, *next; 717 718 nvmf_unregister_transport(&nvme_loop_transport); 719 nvmet_unregister_transport(&nvme_loop_ops); 720 721 mutex_lock(&nvme_loop_ctrl_mutex); 722 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) 723 nvme_delete_ctrl(&ctrl->ctrl); 724 mutex_unlock(&nvme_loop_ctrl_mutex); 725 726 flush_workqueue(nvme_delete_wq); 727 } 728 729 module_init(nvme_loop_init_module); 730 module_exit(nvme_loop_cleanup_module); 731 732 MODULE_LICENSE("GPL v2"); 733 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ 734