2 * NVMe over Fabrics loopback device.
3 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
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.
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
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/scatterlist.h>
16 #include <linux/delay.h>
17 #include <linux/blk-mq.h>
18 #include <linux/nvme.h>
19 #include <linux/module.h>
20 #include <linux/parser.h>
21 #include <linux/t10-pi.h>
23 #include "../host/nvme.h"
24 #include "../host/fabrics.h"
26 #define NVME_LOOP_AQ_DEPTH 256
28 #define NVME_LOOP_MAX_SEGMENTS 256
31 * We handle AEN commands ourselves and don't even let the
32 * block layer know about them.
34 #define NVME_LOOP_NR_AEN_COMMANDS 1
35 #define NVME_LOOP_AQ_BLKMQ_DEPTH \
36 (NVME_LOOP_AQ_DEPTH - NVME_LOOP_NR_AEN_COMMANDS)
38 struct nvme_loop_iod {
39 struct nvme_request nvme_req;
40 struct nvme_command cmd;
41 struct nvme_completion rsp;
43 struct nvme_loop_queue *queue;
44 struct work_struct work;
45 struct sg_table sg_table;
46 struct scatterlist first_sgl[];
49 struct nvme_loop_ctrl {
51 struct nvme_loop_queue *queues;
54 struct blk_mq_tag_set admin_tag_set;
56 struct list_head list;
58 struct blk_mq_tag_set tag_set;
59 struct nvme_loop_iod async_event_iod;
60 struct nvme_ctrl ctrl;
62 struct nvmet_ctrl *target_ctrl;
63 struct work_struct delete_work;
64 struct work_struct reset_work;
67 static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl)
69 return container_of(ctrl, struct nvme_loop_ctrl, ctrl);
72 struct nvme_loop_queue {
73 struct nvmet_cq nvme_cq;
74 struct nvmet_sq nvme_sq;
75 struct nvme_loop_ctrl *ctrl;
78 static struct nvmet_port *nvmet_loop_port;
80 static LIST_HEAD(nvme_loop_ctrl_list);
81 static DEFINE_MUTEX(nvme_loop_ctrl_mutex);
83 static void nvme_loop_queue_response(struct nvmet_req *nvme_req);
84 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl);
86 static struct nvmet_fabrics_ops nvme_loop_ops;
88 static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue)
90 return queue - queue->ctrl->queues;
93 static void nvme_loop_complete_rq(struct request *req)
95 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
98 nvme_cleanup_cmd(req);
99 sg_free_table_chained(&iod->sg_table, true);
101 if (unlikely(req->errors)) {
102 if (nvme_req_needs_retry(req, req->errors)) {
103 nvme_requeue_req(req);
107 if (blk_rq_is_passthrough(req))
110 error = nvme_error_status(req->errors);
113 blk_mq_end_request(req, error);
116 static void nvme_loop_queue_response(struct nvmet_req *req)
118 struct nvme_loop_iod *iod =
119 container_of(req, struct nvme_loop_iod, req);
120 struct nvme_completion *cqe = &iod->rsp;
123 * AEN requests are special as they don't time out and can
124 * survive any kind of queue freeze and often don't respond to
125 * aborts. We don't even bother to allocate a struct request
126 * for them but rather special case them here.
128 if (unlikely(nvme_loop_queue_idx(iod->queue) == 0 &&
129 cqe->command_id >= NVME_LOOP_AQ_BLKMQ_DEPTH)) {
130 nvme_complete_async_event(&iod->queue->ctrl->ctrl, cqe->status,
133 struct request *rq = blk_mq_rq_from_pdu(iod);
135 iod->nvme_req.result = cqe->result;
136 blk_mq_complete_request(rq, le16_to_cpu(cqe->status) >> 1);
140 static void nvme_loop_execute_work(struct work_struct *work)
142 struct nvme_loop_iod *iod =
143 container_of(work, struct nvme_loop_iod, work);
145 iod->req.execute(&iod->req);
148 static enum blk_eh_timer_return
149 nvme_loop_timeout(struct request *rq, bool reserved)
151 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq);
153 /* queue error recovery */
154 schedule_work(&iod->queue->ctrl->reset_work);
156 /* fail with DNR on admin cmd timeout */
157 rq->errors = NVME_SC_ABORT_REQ | NVME_SC_DNR;
159 return BLK_EH_HANDLED;
162 static int nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
163 const struct blk_mq_queue_data *bd)
165 struct nvme_ns *ns = hctx->queue->queuedata;
166 struct nvme_loop_queue *queue = hctx->driver_data;
167 struct request *req = bd->rq;
168 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
171 ret = nvme_setup_cmd(ns, req, &iod->cmd);
172 if (ret != BLK_MQ_RQ_QUEUE_OK)
175 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
176 iod->req.port = nvmet_loop_port;
177 if (!nvmet_req_init(&iod->req, &queue->nvme_cq,
178 &queue->nvme_sq, &nvme_loop_ops)) {
179 nvme_cleanup_cmd(req);
180 blk_mq_start_request(req);
181 nvme_loop_queue_response(&iod->req);
182 return BLK_MQ_RQ_QUEUE_OK;
185 if (blk_rq_bytes(req)) {
186 iod->sg_table.sgl = iod->first_sgl;
187 ret = sg_alloc_table_chained(&iod->sg_table,
188 blk_rq_nr_phys_segments(req),
191 return BLK_MQ_RQ_QUEUE_BUSY;
193 iod->req.sg = iod->sg_table.sgl;
194 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl);
197 blk_mq_start_request(req);
199 schedule_work(&iod->work);
200 return BLK_MQ_RQ_QUEUE_OK;
203 static void nvme_loop_submit_async_event(struct nvme_ctrl *arg, int aer_idx)
205 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg);
206 struct nvme_loop_queue *queue = &ctrl->queues[0];
207 struct nvme_loop_iod *iod = &ctrl->async_event_iod;
209 memset(&iod->cmd, 0, sizeof(iod->cmd));
210 iod->cmd.common.opcode = nvme_admin_async_event;
211 iod->cmd.common.command_id = NVME_LOOP_AQ_BLKMQ_DEPTH;
212 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
214 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq,
216 dev_err(ctrl->ctrl.device, "failed async event work\n");
220 schedule_work(&iod->work);
223 static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl,
224 struct nvme_loop_iod *iod, unsigned int queue_idx)
226 BUG_ON(queue_idx >= ctrl->queue_count);
228 iod->req.cmd = &iod->cmd;
229 iod->req.rsp = &iod->rsp;
230 iod->queue = &ctrl->queues[queue_idx];
231 INIT_WORK(&iod->work, nvme_loop_execute_work);
235 static int nvme_loop_init_request(void *data, struct request *req,
236 unsigned int hctx_idx, unsigned int rq_idx,
237 unsigned int numa_node)
239 return nvme_loop_init_iod(data, blk_mq_rq_to_pdu(req), hctx_idx + 1);
242 static int nvme_loop_init_admin_request(void *data, struct request *req,
243 unsigned int hctx_idx, unsigned int rq_idx,
244 unsigned int numa_node)
246 return nvme_loop_init_iod(data, blk_mq_rq_to_pdu(req), 0);
249 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
250 unsigned int hctx_idx)
252 struct nvme_loop_ctrl *ctrl = data;
253 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1];
255 BUG_ON(hctx_idx >= ctrl->queue_count);
257 hctx->driver_data = queue;
261 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
262 unsigned int hctx_idx)
264 struct nvme_loop_ctrl *ctrl = data;
265 struct nvme_loop_queue *queue = &ctrl->queues[0];
267 BUG_ON(hctx_idx != 0);
269 hctx->driver_data = queue;
273 static struct blk_mq_ops nvme_loop_mq_ops = {
274 .queue_rq = nvme_loop_queue_rq,
275 .complete = nvme_loop_complete_rq,
276 .init_request = nvme_loop_init_request,
277 .init_hctx = nvme_loop_init_hctx,
278 .timeout = nvme_loop_timeout,
281 static struct blk_mq_ops nvme_loop_admin_mq_ops = {
282 .queue_rq = nvme_loop_queue_rq,
283 .complete = nvme_loop_complete_rq,
284 .init_request = nvme_loop_init_admin_request,
285 .init_hctx = nvme_loop_init_admin_hctx,
286 .timeout = nvme_loop_timeout,
289 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl)
291 blk_cleanup_queue(ctrl->ctrl.admin_q);
292 blk_mq_free_tag_set(&ctrl->admin_tag_set);
293 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
296 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl)
298 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
300 if (list_empty(&ctrl->list))
303 mutex_lock(&nvme_loop_ctrl_mutex);
304 list_del(&ctrl->list);
305 mutex_unlock(&nvme_loop_ctrl_mutex);
308 blk_cleanup_queue(ctrl->ctrl.connect_q);
309 blk_mq_free_tag_set(&ctrl->tag_set);
312 nvmf_free_options(nctrl->opts);
317 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl)
321 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
322 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops;
323 ctrl->admin_tag_set.queue_depth = NVME_LOOP_AQ_BLKMQ_DEPTH;
324 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */
325 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
326 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
327 SG_CHUNK_SIZE * sizeof(struct scatterlist);
328 ctrl->admin_tag_set.driver_data = ctrl;
329 ctrl->admin_tag_set.nr_hw_queues = 1;
330 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
332 ctrl->queues[0].ctrl = ctrl;
333 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq);
336 ctrl->queue_count = 1;
338 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
342 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
343 if (IS_ERR(ctrl->ctrl.admin_q)) {
344 error = PTR_ERR(ctrl->ctrl.admin_q);
345 goto out_free_tagset;
348 error = nvmf_connect_admin_queue(&ctrl->ctrl);
350 goto out_cleanup_queue;
352 error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap);
354 dev_err(ctrl->ctrl.device,
355 "prop_get NVME_REG_CAP failed\n");
356 goto out_cleanup_queue;
360 min_t(int, NVME_CAP_MQES(ctrl->cap) + 1, ctrl->ctrl.sqsize);
362 error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
364 goto out_cleanup_queue;
366 ctrl->ctrl.max_hw_sectors =
367 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9);
369 error = nvme_init_identify(&ctrl->ctrl);
371 goto out_cleanup_queue;
373 nvme_start_keep_alive(&ctrl->ctrl);
378 blk_cleanup_queue(ctrl->ctrl.admin_q);
380 blk_mq_free_tag_set(&ctrl->admin_tag_set);
382 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
386 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl)
390 nvme_stop_keep_alive(&ctrl->ctrl);
392 if (ctrl->queue_count > 1) {
393 nvme_stop_queues(&ctrl->ctrl);
394 blk_mq_tagset_busy_iter(&ctrl->tag_set,
395 nvme_cancel_request, &ctrl->ctrl);
397 for (i = 1; i < ctrl->queue_count; i++)
398 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
401 if (ctrl->ctrl.state == NVME_CTRL_LIVE)
402 nvme_shutdown_ctrl(&ctrl->ctrl);
404 blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
405 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
406 nvme_cancel_request, &ctrl->ctrl);
407 nvme_loop_destroy_admin_queue(ctrl);
410 static void nvme_loop_del_ctrl_work(struct work_struct *work)
412 struct nvme_loop_ctrl *ctrl = container_of(work,
413 struct nvme_loop_ctrl, delete_work);
415 nvme_uninit_ctrl(&ctrl->ctrl);
416 nvme_loop_shutdown_ctrl(ctrl);
417 nvme_put_ctrl(&ctrl->ctrl);
420 static int __nvme_loop_del_ctrl(struct nvme_loop_ctrl *ctrl)
422 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
425 if (!schedule_work(&ctrl->delete_work))
431 static int nvme_loop_del_ctrl(struct nvme_ctrl *nctrl)
433 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
436 ret = __nvme_loop_del_ctrl(ctrl);
440 flush_work(&ctrl->delete_work);
445 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl)
447 struct nvme_loop_ctrl *ctrl;
449 mutex_lock(&nvme_loop_ctrl_mutex);
450 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) {
451 if (ctrl->ctrl.cntlid == nctrl->cntlid)
452 __nvme_loop_del_ctrl(ctrl);
454 mutex_unlock(&nvme_loop_ctrl_mutex);
457 static void nvme_loop_reset_ctrl_work(struct work_struct *work)
459 struct nvme_loop_ctrl *ctrl = container_of(work,
460 struct nvme_loop_ctrl, reset_work);
464 nvme_loop_shutdown_ctrl(ctrl);
466 ret = nvme_loop_configure_admin_queue(ctrl);
470 for (i = 1; i <= ctrl->ctrl.opts->nr_io_queues; i++) {
471 ctrl->queues[i].ctrl = ctrl;
472 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq);
474 goto out_free_queues;
479 for (i = 1; i <= ctrl->ctrl.opts->nr_io_queues; i++) {
480 ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
482 goto out_free_queues;
485 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
486 WARN_ON_ONCE(!changed);
488 nvme_queue_scan(&ctrl->ctrl);
489 nvme_queue_async_events(&ctrl->ctrl);
491 nvme_start_queues(&ctrl->ctrl);
496 for (i = 1; i < ctrl->queue_count; i++)
497 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
498 nvme_loop_destroy_admin_queue(ctrl);
500 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
501 nvme_uninit_ctrl(&ctrl->ctrl);
502 nvme_put_ctrl(&ctrl->ctrl);
505 static int nvme_loop_reset_ctrl(struct nvme_ctrl *nctrl)
507 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
509 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
512 if (!schedule_work(&ctrl->reset_work))
515 flush_work(&ctrl->reset_work);
520 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
522 .module = THIS_MODULE,
524 .reg_read32 = nvmf_reg_read32,
525 .reg_read64 = nvmf_reg_read64,
526 .reg_write32 = nvmf_reg_write32,
527 .reset_ctrl = nvme_loop_reset_ctrl,
528 .free_ctrl = nvme_loop_free_ctrl,
529 .submit_async_event = nvme_loop_submit_async_event,
530 .delete_ctrl = nvme_loop_del_ctrl,
531 .get_subsysnqn = nvmf_get_subsysnqn,
534 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
536 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
539 ret = nvme_set_queue_count(&ctrl->ctrl, &opts->nr_io_queues);
540 if (ret || !opts->nr_io_queues)
543 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n",
546 for (i = 1; i <= opts->nr_io_queues; i++) {
547 ctrl->queues[i].ctrl = ctrl;
548 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq);
550 goto out_destroy_queues;
555 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
556 ctrl->tag_set.ops = &nvme_loop_mq_ops;
557 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
558 ctrl->tag_set.reserved_tags = 1; /* fabric connect */
559 ctrl->tag_set.numa_node = NUMA_NO_NODE;
560 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
561 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
562 SG_CHUNK_SIZE * sizeof(struct scatterlist);
563 ctrl->tag_set.driver_data = ctrl;
564 ctrl->tag_set.nr_hw_queues = ctrl->queue_count - 1;
565 ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
566 ctrl->ctrl.tagset = &ctrl->tag_set;
568 ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
570 goto out_destroy_queues;
572 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
573 if (IS_ERR(ctrl->ctrl.connect_q)) {
574 ret = PTR_ERR(ctrl->ctrl.connect_q);
575 goto out_free_tagset;
578 for (i = 1; i <= opts->nr_io_queues; i++) {
579 ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
581 goto out_cleanup_connect_q;
586 out_cleanup_connect_q:
587 blk_cleanup_queue(ctrl->ctrl.connect_q);
589 blk_mq_free_tag_set(&ctrl->tag_set);
591 for (i = 1; i < ctrl->queue_count; i++)
592 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
596 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
597 struct nvmf_ctrl_options *opts)
599 struct nvme_loop_ctrl *ctrl;
603 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
605 return ERR_PTR(-ENOMEM);
606 ctrl->ctrl.opts = opts;
607 INIT_LIST_HEAD(&ctrl->list);
609 INIT_WORK(&ctrl->delete_work, nvme_loop_del_ctrl_work);
610 INIT_WORK(&ctrl->reset_work, nvme_loop_reset_ctrl_work);
612 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops,
613 0 /* no quirks, we're perfect! */);
617 spin_lock_init(&ctrl->lock);
621 ctrl->ctrl.sqsize = opts->queue_size - 1;
622 ctrl->ctrl.kato = opts->kato;
624 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),
627 goto out_uninit_ctrl;
629 ret = nvme_loop_configure_admin_queue(ctrl);
631 goto out_free_queues;
633 if (opts->queue_size > ctrl->ctrl.maxcmd) {
634 /* warn if maxcmd is lower than queue_size */
635 dev_warn(ctrl->ctrl.device,
636 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
637 opts->queue_size, ctrl->ctrl.maxcmd);
638 opts->queue_size = ctrl->ctrl.maxcmd;
641 if (opts->nr_io_queues) {
642 ret = nvme_loop_create_io_queues(ctrl);
644 goto out_remove_admin_queue;
647 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0);
649 dev_info(ctrl->ctrl.device,
650 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
652 kref_get(&ctrl->ctrl.kref);
654 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
655 WARN_ON_ONCE(!changed);
657 mutex_lock(&nvme_loop_ctrl_mutex);
658 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list);
659 mutex_unlock(&nvme_loop_ctrl_mutex);
661 if (opts->nr_io_queues) {
662 nvme_queue_scan(&ctrl->ctrl);
663 nvme_queue_async_events(&ctrl->ctrl);
668 out_remove_admin_queue:
669 nvme_loop_destroy_admin_queue(ctrl);
673 nvme_uninit_ctrl(&ctrl->ctrl);
675 nvme_put_ctrl(&ctrl->ctrl);
681 static int nvme_loop_add_port(struct nvmet_port *port)
684 * XXX: disalow adding more than one port so
685 * there is no connection rejections when a
686 * a subsystem is assigned to a port for which
687 * loop doesn't have a pointer.
688 * This scenario would be possible if we allowed
689 * more than one port to be added and a subsystem
690 * was assigned to a port other than nvmet_loop_port.
696 nvmet_loop_port = port;
700 static void nvme_loop_remove_port(struct nvmet_port *port)
702 if (port == nvmet_loop_port)
703 nvmet_loop_port = NULL;
706 static struct nvmet_fabrics_ops nvme_loop_ops = {
707 .owner = THIS_MODULE,
708 .type = NVMF_TRTYPE_LOOP,
709 .add_port = nvme_loop_add_port,
710 .remove_port = nvme_loop_remove_port,
711 .queue_response = nvme_loop_queue_response,
712 .delete_ctrl = nvme_loop_delete_ctrl,
715 static struct nvmf_transport_ops nvme_loop_transport = {
717 .create_ctrl = nvme_loop_create_ctrl,
720 static int __init nvme_loop_init_module(void)
724 ret = nvmet_register_transport(&nvme_loop_ops);
727 return nvmf_register_transport(&nvme_loop_transport);
730 static void __exit nvme_loop_cleanup_module(void)
732 struct nvme_loop_ctrl *ctrl, *next;
734 nvmf_unregister_transport(&nvme_loop_transport);
735 nvmet_unregister_transport(&nvme_loop_ops);
737 mutex_lock(&nvme_loop_ctrl_mutex);
738 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list)
739 __nvme_loop_del_ctrl(ctrl);
740 mutex_unlock(&nvme_loop_ctrl_mutex);
742 flush_scheduled_work();
745 module_init(nvme_loop_init_module);
746 module_exit(nvme_loop_cleanup_module);
748 MODULE_LICENSE("GPL v2");
749 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */