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(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 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), 231 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); 232 } 233 234 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 235 unsigned int hctx_idx) 236 { 237 struct nvme_loop_ctrl *ctrl = data; 238 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; 239 240 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); 241 242 hctx->driver_data = queue; 243 return 0; 244 } 245 246 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, 247 unsigned int hctx_idx) 248 { 249 struct nvme_loop_ctrl *ctrl = data; 250 struct nvme_loop_queue *queue = &ctrl->queues[0]; 251 252 BUG_ON(hctx_idx != 0); 253 254 hctx->driver_data = queue; 255 return 0; 256 } 257 258 static const struct blk_mq_ops nvme_loop_mq_ops = { 259 .queue_rq = nvme_loop_queue_rq, 260 .complete = nvme_loop_complete_rq, 261 .init_request = nvme_loop_init_request, 262 .init_hctx = nvme_loop_init_hctx, 263 .timeout = nvme_loop_timeout, 264 }; 265 266 static const struct blk_mq_ops nvme_loop_admin_mq_ops = { 267 .queue_rq = nvme_loop_queue_rq, 268 .complete = nvme_loop_complete_rq, 269 .init_request = nvme_loop_init_request, 270 .init_hctx = nvme_loop_init_admin_hctx, 271 .timeout = nvme_loop_timeout, 272 }; 273 274 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) 275 { 276 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 277 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 278 blk_cleanup_queue(ctrl->ctrl.admin_q); 279 blk_mq_free_tag_set(&ctrl->admin_tag_set); 280 } 281 282 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) 283 { 284 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); 285 286 if (list_empty(&ctrl->list)) 287 goto free_ctrl; 288 289 mutex_lock(&nvme_loop_ctrl_mutex); 290 list_del(&ctrl->list); 291 mutex_unlock(&nvme_loop_ctrl_mutex); 292 293 if (nctrl->tagset) { 294 blk_cleanup_queue(ctrl->ctrl.connect_q); 295 blk_mq_free_tag_set(&ctrl->tag_set); 296 } 297 kfree(ctrl->queues); 298 nvmf_free_options(nctrl->opts); 299 free_ctrl: 300 kfree(ctrl); 301 } 302 303 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) 304 { 305 int i; 306 307 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 308 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 309 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); 310 } 311 } 312 313 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) 314 { 315 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; 316 unsigned int nr_io_queues; 317 int ret, i; 318 319 nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); 320 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); 321 if (ret || !nr_io_queues) 322 return ret; 323 324 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); 325 326 for (i = 1; i <= nr_io_queues; i++) { 327 ctrl->queues[i].ctrl = ctrl; 328 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); 329 if (ret) 330 goto out_destroy_queues; 331 332 ctrl->ctrl.queue_count++; 333 } 334 335 return 0; 336 337 out_destroy_queues: 338 nvme_loop_destroy_io_queues(ctrl); 339 return ret; 340 } 341 342 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) 343 { 344 int i, ret; 345 346 for (i = 1; i < ctrl->ctrl.queue_count; i++) { 347 ret = nvmf_connect_io_queue(&ctrl->ctrl, i); 348 if (ret) 349 return ret; 350 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); 351 } 352 353 return 0; 354 } 355 356 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) 357 { 358 int error; 359 360 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); 361 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; 362 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 363 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ 364 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; 365 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 366 SG_CHUNK_SIZE * sizeof(struct scatterlist); 367 ctrl->admin_tag_set.driver_data = ctrl; 368 ctrl->admin_tag_set.nr_hw_queues = 1; 369 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; 370 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; 371 372 ctrl->queues[0].ctrl = ctrl; 373 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); 374 if (error) 375 return error; 376 ctrl->ctrl.queue_count = 1; 377 378 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); 379 if (error) 380 goto out_free_sq; 381 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; 382 383 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); 384 if (IS_ERR(ctrl->ctrl.admin_q)) { 385 error = PTR_ERR(ctrl->ctrl.admin_q); 386 goto out_free_tagset; 387 } 388 389 error = nvmf_connect_admin_queue(&ctrl->ctrl); 390 if (error) 391 goto out_cleanup_queue; 392 393 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); 394 395 error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); 396 if (error) { 397 dev_err(ctrl->ctrl.device, 398 "prop_get NVME_REG_CAP failed\n"); 399 goto out_cleanup_queue; 400 } 401 402 ctrl->ctrl.sqsize = 403 min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); 404 405 error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); 406 if (error) 407 goto out_cleanup_queue; 408 409 ctrl->ctrl.max_hw_sectors = 410 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); 411 412 error = nvme_init_identify(&ctrl->ctrl); 413 if (error) 414 goto out_cleanup_queue; 415 416 return 0; 417 418 out_cleanup_queue: 419 blk_cleanup_queue(ctrl->ctrl.admin_q); 420 out_free_tagset: 421 blk_mq_free_tag_set(&ctrl->admin_tag_set); 422 out_free_sq: 423 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); 424 return error; 425 } 426 427 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) 428 { 429 if (ctrl->ctrl.queue_count > 1) { 430 nvme_stop_queues(&ctrl->ctrl); 431 blk_mq_tagset_busy_iter(&ctrl->tag_set, 432 nvme_cancel_request, &ctrl->ctrl); 433 nvme_loop_destroy_io_queues(ctrl); 434 } 435 436 if (ctrl->ctrl.state == NVME_CTRL_LIVE) 437 nvme_shutdown_ctrl(&ctrl->ctrl); 438 439 blk_mq_quiesce_queue(ctrl->ctrl.admin_q); 440 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, 441 nvme_cancel_request, &ctrl->ctrl); 442 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); 443 nvme_loop_destroy_admin_queue(ctrl); 444 } 445 446 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) 447 { 448 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); 449 } 450 451 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) 452 { 453 struct nvme_loop_ctrl *ctrl; 454 455 mutex_lock(&nvme_loop_ctrl_mutex); 456 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { 457 if (ctrl->ctrl.cntlid == nctrl->cntlid) 458 nvme_delete_ctrl(&ctrl->ctrl); 459 } 460 mutex_unlock(&nvme_loop_ctrl_mutex); 461 } 462 463 static void nvme_loop_reset_ctrl_work(struct work_struct *work) 464 { 465 struct nvme_loop_ctrl *ctrl = 466 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); 467 bool changed; 468 int ret; 469 470 nvme_stop_ctrl(&ctrl->ctrl); 471 nvme_loop_shutdown_ctrl(ctrl); 472 473 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { 474 /* state change failure should never happen */ 475 WARN_ON_ONCE(1); 476 return; 477 } 478 479 ret = nvme_loop_configure_admin_queue(ctrl); 480 if (ret) 481 goto out_disable; 482 483 ret = nvme_loop_init_io_queues(ctrl); 484 if (ret) 485 goto out_destroy_admin; 486 487 ret = nvme_loop_connect_io_queues(ctrl); 488 if (ret) 489 goto out_destroy_io; 490 491 blk_mq_update_nr_hw_queues(&ctrl->tag_set, 492 ctrl->ctrl.queue_count - 1); 493 494 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 495 WARN_ON_ONCE(!changed); 496 497 nvme_start_ctrl(&ctrl->ctrl); 498 499 return; 500 501 out_destroy_io: 502 nvme_loop_destroy_io_queues(ctrl); 503 out_destroy_admin: 504 nvme_loop_destroy_admin_queue(ctrl); 505 out_disable: 506 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); 507 nvme_uninit_ctrl(&ctrl->ctrl); 508 nvme_put_ctrl(&ctrl->ctrl); 509 } 510 511 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { 512 .name = "loop", 513 .module = THIS_MODULE, 514 .flags = NVME_F_FABRICS, 515 .reg_read32 = nvmf_reg_read32, 516 .reg_read64 = nvmf_reg_read64, 517 .reg_write32 = nvmf_reg_write32, 518 .free_ctrl = nvme_loop_free_ctrl, 519 .submit_async_event = nvme_loop_submit_async_event, 520 .delete_ctrl = nvme_loop_delete_ctrl_host, 521 .get_address = nvmf_get_address, 522 }; 523 524 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) 525 { 526 int ret; 527 528 ret = nvme_loop_init_io_queues(ctrl); 529 if (ret) 530 return ret; 531 532 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); 533 ctrl->tag_set.ops = &nvme_loop_mq_ops; 534 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; 535 ctrl->tag_set.reserved_tags = 1; /* fabric connect */ 536 ctrl->tag_set.numa_node = NUMA_NO_NODE; 537 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; 538 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + 539 SG_CHUNK_SIZE * sizeof(struct scatterlist); 540 ctrl->tag_set.driver_data = ctrl; 541 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; 542 ctrl->tag_set.timeout = NVME_IO_TIMEOUT; 543 ctrl->ctrl.tagset = &ctrl->tag_set; 544 545 ret = blk_mq_alloc_tag_set(&ctrl->tag_set); 546 if (ret) 547 goto out_destroy_queues; 548 549 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); 550 if (IS_ERR(ctrl->ctrl.connect_q)) { 551 ret = PTR_ERR(ctrl->ctrl.connect_q); 552 goto out_free_tagset; 553 } 554 555 ret = nvme_loop_connect_io_queues(ctrl); 556 if (ret) 557 goto out_cleanup_connect_q; 558 559 return 0; 560 561 out_cleanup_connect_q: 562 blk_cleanup_queue(ctrl->ctrl.connect_q); 563 out_free_tagset: 564 blk_mq_free_tag_set(&ctrl->tag_set); 565 out_destroy_queues: 566 nvme_loop_destroy_io_queues(ctrl); 567 return ret; 568 } 569 570 static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) 571 { 572 struct nvmet_port *p, *found = NULL; 573 574 mutex_lock(&nvme_loop_ports_mutex); 575 list_for_each_entry(p, &nvme_loop_ports, entry) { 576 /* if no transport address is specified use the first port */ 577 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && 578 strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) 579 continue; 580 found = p; 581 break; 582 } 583 mutex_unlock(&nvme_loop_ports_mutex); 584 return found; 585 } 586 587 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, 588 struct nvmf_ctrl_options *opts) 589 { 590 struct nvme_loop_ctrl *ctrl; 591 bool changed; 592 int ret; 593 594 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 595 if (!ctrl) 596 return ERR_PTR(-ENOMEM); 597 ctrl->ctrl.opts = opts; 598 INIT_LIST_HEAD(&ctrl->list); 599 600 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); 601 602 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, 603 0 /* no quirks, we're perfect! */); 604 if (ret) 605 goto out_put_ctrl; 606 607 ret = -ENOMEM; 608 609 ctrl->ctrl.sqsize = opts->queue_size - 1; 610 ctrl->ctrl.kato = opts->kato; 611 ctrl->port = nvme_loop_find_port(&ctrl->ctrl); 612 613 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), 614 GFP_KERNEL); 615 if (!ctrl->queues) 616 goto out_uninit_ctrl; 617 618 ret = nvme_loop_configure_admin_queue(ctrl); 619 if (ret) 620 goto out_free_queues; 621 622 if (opts->queue_size > ctrl->ctrl.maxcmd) { 623 /* warn if maxcmd is lower than queue_size */ 624 dev_warn(ctrl->ctrl.device, 625 "queue_size %zu > ctrl maxcmd %u, clamping down\n", 626 opts->queue_size, ctrl->ctrl.maxcmd); 627 opts->queue_size = ctrl->ctrl.maxcmd; 628 } 629 630 if (opts->nr_io_queues) { 631 ret = nvme_loop_create_io_queues(ctrl); 632 if (ret) 633 goto out_remove_admin_queue; 634 } 635 636 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); 637 638 dev_info(ctrl->ctrl.device, 639 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); 640 641 nvme_get_ctrl(&ctrl->ctrl); 642 643 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); 644 WARN_ON_ONCE(!changed); 645 646 mutex_lock(&nvme_loop_ctrl_mutex); 647 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); 648 mutex_unlock(&nvme_loop_ctrl_mutex); 649 650 nvme_start_ctrl(&ctrl->ctrl); 651 652 return &ctrl->ctrl; 653 654 out_remove_admin_queue: 655 nvme_loop_destroy_admin_queue(ctrl); 656 out_free_queues: 657 kfree(ctrl->queues); 658 out_uninit_ctrl: 659 nvme_uninit_ctrl(&ctrl->ctrl); 660 out_put_ctrl: 661 nvme_put_ctrl(&ctrl->ctrl); 662 if (ret > 0) 663 ret = -EIO; 664 return ERR_PTR(ret); 665 } 666 667 static int nvme_loop_add_port(struct nvmet_port *port) 668 { 669 mutex_lock(&nvme_loop_ports_mutex); 670 list_add_tail(&port->entry, &nvme_loop_ports); 671 mutex_unlock(&nvme_loop_ports_mutex); 672 return 0; 673 } 674 675 static void nvme_loop_remove_port(struct nvmet_port *port) 676 { 677 mutex_lock(&nvme_loop_ports_mutex); 678 list_del_init(&port->entry); 679 mutex_unlock(&nvme_loop_ports_mutex); 680 } 681 682 static const struct nvmet_fabrics_ops nvme_loop_ops = { 683 .owner = THIS_MODULE, 684 .type = NVMF_TRTYPE_LOOP, 685 .add_port = nvme_loop_add_port, 686 .remove_port = nvme_loop_remove_port, 687 .queue_response = nvme_loop_queue_response, 688 .delete_ctrl = nvme_loop_delete_ctrl, 689 }; 690 691 static struct nvmf_transport_ops nvme_loop_transport = { 692 .name = "loop", 693 .module = THIS_MODULE, 694 .create_ctrl = nvme_loop_create_ctrl, 695 .allowed_opts = NVMF_OPT_TRADDR, 696 }; 697 698 static int __init nvme_loop_init_module(void) 699 { 700 int ret; 701 702 ret = nvmet_register_transport(&nvme_loop_ops); 703 if (ret) 704 return ret; 705 706 ret = nvmf_register_transport(&nvme_loop_transport); 707 if (ret) 708 nvmet_unregister_transport(&nvme_loop_ops); 709 710 return ret; 711 } 712 713 static void __exit nvme_loop_cleanup_module(void) 714 { 715 struct nvme_loop_ctrl *ctrl, *next; 716 717 nvmf_unregister_transport(&nvme_loop_transport); 718 nvmet_unregister_transport(&nvme_loop_ops); 719 720 mutex_lock(&nvme_loop_ctrl_mutex); 721 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) 722 nvme_delete_ctrl(&ctrl->ctrl); 723 mutex_unlock(&nvme_loop_ctrl_mutex); 724 725 flush_workqueue(nvme_delete_wq); 726 } 727 728 module_init(nvme_loop_init_module); 729 module_exit(nvme_loop_cleanup_module); 730 731 MODULE_LICENSE("GPL v2"); 732 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ 733