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 iod->req.cmd = &iod->cmd;
227 iod->req.rsp = &iod->rsp;
228 iod->queue = &ctrl->queues[queue_idx];
229 INIT_WORK(&iod->work, nvme_loop_execute_work);
233 static int nvme_loop_init_request(void *data, struct request *req,
234 unsigned int hctx_idx, unsigned int rq_idx,
235 unsigned int numa_node)
237 return nvme_loop_init_iod(data, blk_mq_rq_to_pdu(req), hctx_idx + 1);
240 static int nvme_loop_init_admin_request(void *data, struct request *req,
241 unsigned int hctx_idx, unsigned int rq_idx,
242 unsigned int numa_node)
244 return nvme_loop_init_iod(data, blk_mq_rq_to_pdu(req), 0);
247 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
248 unsigned int hctx_idx)
250 struct nvme_loop_ctrl *ctrl = data;
251 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1];
253 BUG_ON(hctx_idx >= ctrl->queue_count);
255 hctx->driver_data = queue;
259 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
260 unsigned int hctx_idx)
262 struct nvme_loop_ctrl *ctrl = data;
263 struct nvme_loop_queue *queue = &ctrl->queues[0];
265 BUG_ON(hctx_idx != 0);
267 hctx->driver_data = queue;
271 static struct blk_mq_ops nvme_loop_mq_ops = {
272 .queue_rq = nvme_loop_queue_rq,
273 .complete = nvme_loop_complete_rq,
274 .init_request = nvme_loop_init_request,
275 .init_hctx = nvme_loop_init_hctx,
276 .timeout = nvme_loop_timeout,
279 static struct blk_mq_ops nvme_loop_admin_mq_ops = {
280 .queue_rq = nvme_loop_queue_rq,
281 .complete = nvme_loop_complete_rq,
282 .init_request = nvme_loop_init_admin_request,
283 .init_hctx = nvme_loop_init_admin_hctx,
284 .timeout = nvme_loop_timeout,
287 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl)
289 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
290 blk_cleanup_queue(ctrl->ctrl.admin_q);
291 blk_mq_free_tag_set(&ctrl->admin_tag_set);
294 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl)
296 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
298 if (list_empty(&ctrl->list))
301 mutex_lock(&nvme_loop_ctrl_mutex);
302 list_del(&ctrl->list);
303 mutex_unlock(&nvme_loop_ctrl_mutex);
306 blk_cleanup_queue(ctrl->ctrl.connect_q);
307 blk_mq_free_tag_set(&ctrl->tag_set);
310 nvmf_free_options(nctrl->opts);
315 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl)
319 for (i = 1; i < ctrl->queue_count; i++)
320 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
323 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl)
325 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
326 unsigned int nr_io_queues;
329 nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
330 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
331 if (ret || !nr_io_queues)
334 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues);
336 for (i = 1; i <= nr_io_queues; i++) {
337 ctrl->queues[i].ctrl = ctrl;
338 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq);
340 goto out_destroy_queues;
348 nvme_loop_destroy_io_queues(ctrl);
352 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl)
356 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
357 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops;
358 ctrl->admin_tag_set.queue_depth = NVME_LOOP_AQ_BLKMQ_DEPTH;
359 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */
360 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
361 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
362 SG_CHUNK_SIZE * sizeof(struct scatterlist);
363 ctrl->admin_tag_set.driver_data = ctrl;
364 ctrl->admin_tag_set.nr_hw_queues = 1;
365 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
367 ctrl->queues[0].ctrl = ctrl;
368 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq);
371 ctrl->queue_count = 1;
373 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
377 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
378 if (IS_ERR(ctrl->ctrl.admin_q)) {
379 error = PTR_ERR(ctrl->ctrl.admin_q);
380 goto out_free_tagset;
383 error = nvmf_connect_admin_queue(&ctrl->ctrl);
385 goto out_cleanup_queue;
387 error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap);
389 dev_err(ctrl->ctrl.device,
390 "prop_get NVME_REG_CAP failed\n");
391 goto out_cleanup_queue;
395 min_t(int, NVME_CAP_MQES(ctrl->cap) + 1, ctrl->ctrl.sqsize);
397 error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
399 goto out_cleanup_queue;
401 ctrl->ctrl.max_hw_sectors =
402 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9);
404 error = nvme_init_identify(&ctrl->ctrl);
406 goto out_cleanup_queue;
408 nvme_start_keep_alive(&ctrl->ctrl);
413 blk_cleanup_queue(ctrl->ctrl.admin_q);
415 blk_mq_free_tag_set(&ctrl->admin_tag_set);
417 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
421 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl)
423 nvme_stop_keep_alive(&ctrl->ctrl);
425 if (ctrl->queue_count > 1) {
426 nvme_stop_queues(&ctrl->ctrl);
427 blk_mq_tagset_busy_iter(&ctrl->tag_set,
428 nvme_cancel_request, &ctrl->ctrl);
429 nvme_loop_destroy_io_queues(ctrl);
432 if (ctrl->ctrl.state == NVME_CTRL_LIVE)
433 nvme_shutdown_ctrl(&ctrl->ctrl);
435 blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
436 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
437 nvme_cancel_request, &ctrl->ctrl);
438 nvme_loop_destroy_admin_queue(ctrl);
441 static void nvme_loop_del_ctrl_work(struct work_struct *work)
443 struct nvme_loop_ctrl *ctrl = container_of(work,
444 struct nvme_loop_ctrl, delete_work);
446 nvme_uninit_ctrl(&ctrl->ctrl);
447 nvme_loop_shutdown_ctrl(ctrl);
448 nvme_put_ctrl(&ctrl->ctrl);
451 static int __nvme_loop_del_ctrl(struct nvme_loop_ctrl *ctrl)
453 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
456 if (!schedule_work(&ctrl->delete_work))
462 static int nvme_loop_del_ctrl(struct nvme_ctrl *nctrl)
464 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
467 ret = __nvme_loop_del_ctrl(ctrl);
471 flush_work(&ctrl->delete_work);
476 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl)
478 struct nvme_loop_ctrl *ctrl;
480 mutex_lock(&nvme_loop_ctrl_mutex);
481 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) {
482 if (ctrl->ctrl.cntlid == nctrl->cntlid)
483 __nvme_loop_del_ctrl(ctrl);
485 mutex_unlock(&nvme_loop_ctrl_mutex);
488 static void nvme_loop_reset_ctrl_work(struct work_struct *work)
490 struct nvme_loop_ctrl *ctrl = container_of(work,
491 struct nvme_loop_ctrl, reset_work);
495 nvme_loop_shutdown_ctrl(ctrl);
497 ret = nvme_loop_configure_admin_queue(ctrl);
501 ret = nvme_loop_init_io_queues(ctrl);
503 goto out_destroy_admin;
505 for (i = 1; i < ctrl->queue_count; i++) {
506 ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
511 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
512 WARN_ON_ONCE(!changed);
514 nvme_queue_scan(&ctrl->ctrl);
515 nvme_queue_async_events(&ctrl->ctrl);
517 nvme_start_queues(&ctrl->ctrl);
522 nvme_loop_destroy_io_queues(ctrl);
524 nvme_loop_destroy_admin_queue(ctrl);
526 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
527 nvme_uninit_ctrl(&ctrl->ctrl);
528 nvme_put_ctrl(&ctrl->ctrl);
531 static int nvme_loop_reset_ctrl(struct nvme_ctrl *nctrl)
533 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
535 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
538 if (!schedule_work(&ctrl->reset_work))
541 flush_work(&ctrl->reset_work);
546 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
548 .module = THIS_MODULE,
550 .reg_read32 = nvmf_reg_read32,
551 .reg_read64 = nvmf_reg_read64,
552 .reg_write32 = nvmf_reg_write32,
553 .reset_ctrl = nvme_loop_reset_ctrl,
554 .free_ctrl = nvme_loop_free_ctrl,
555 .submit_async_event = nvme_loop_submit_async_event,
556 .delete_ctrl = nvme_loop_del_ctrl,
557 .get_subsysnqn = nvmf_get_subsysnqn,
560 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
564 ret = nvme_loop_init_io_queues(ctrl);
568 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
569 ctrl->tag_set.ops = &nvme_loop_mq_ops;
570 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
571 ctrl->tag_set.reserved_tags = 1; /* fabric connect */
572 ctrl->tag_set.numa_node = NUMA_NO_NODE;
573 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
574 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
575 SG_CHUNK_SIZE * sizeof(struct scatterlist);
576 ctrl->tag_set.driver_data = ctrl;
577 ctrl->tag_set.nr_hw_queues = ctrl->queue_count - 1;
578 ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
579 ctrl->ctrl.tagset = &ctrl->tag_set;
581 ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
583 goto out_destroy_queues;
585 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
586 if (IS_ERR(ctrl->ctrl.connect_q)) {
587 ret = PTR_ERR(ctrl->ctrl.connect_q);
588 goto out_free_tagset;
591 for (i = 1; i < ctrl->queue_count; i++) {
592 ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
594 goto out_cleanup_connect_q;
599 out_cleanup_connect_q:
600 blk_cleanup_queue(ctrl->ctrl.connect_q);
602 blk_mq_free_tag_set(&ctrl->tag_set);
604 nvme_loop_destroy_io_queues(ctrl);
608 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
609 struct nvmf_ctrl_options *opts)
611 struct nvme_loop_ctrl *ctrl;
615 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
617 return ERR_PTR(-ENOMEM);
618 ctrl->ctrl.opts = opts;
619 INIT_LIST_HEAD(&ctrl->list);
621 INIT_WORK(&ctrl->delete_work, nvme_loop_del_ctrl_work);
622 INIT_WORK(&ctrl->reset_work, nvme_loop_reset_ctrl_work);
624 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops,
625 0 /* no quirks, we're perfect! */);
629 spin_lock_init(&ctrl->lock);
633 ctrl->ctrl.sqsize = opts->queue_size - 1;
634 ctrl->ctrl.kato = opts->kato;
636 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),
639 goto out_uninit_ctrl;
641 ret = nvme_loop_configure_admin_queue(ctrl);
643 goto out_free_queues;
645 if (opts->queue_size > ctrl->ctrl.maxcmd) {
646 /* warn if maxcmd is lower than queue_size */
647 dev_warn(ctrl->ctrl.device,
648 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
649 opts->queue_size, ctrl->ctrl.maxcmd);
650 opts->queue_size = ctrl->ctrl.maxcmd;
653 if (opts->nr_io_queues) {
654 ret = nvme_loop_create_io_queues(ctrl);
656 goto out_remove_admin_queue;
659 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0);
661 dev_info(ctrl->ctrl.device,
662 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
664 kref_get(&ctrl->ctrl.kref);
666 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
667 WARN_ON_ONCE(!changed);
669 mutex_lock(&nvme_loop_ctrl_mutex);
670 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list);
671 mutex_unlock(&nvme_loop_ctrl_mutex);
673 if (opts->nr_io_queues) {
674 nvme_queue_scan(&ctrl->ctrl);
675 nvme_queue_async_events(&ctrl->ctrl);
680 out_remove_admin_queue:
681 nvme_loop_destroy_admin_queue(ctrl);
685 nvme_uninit_ctrl(&ctrl->ctrl);
687 nvme_put_ctrl(&ctrl->ctrl);
693 static int nvme_loop_add_port(struct nvmet_port *port)
696 * XXX: disalow adding more than one port so
697 * there is no connection rejections when a
698 * a subsystem is assigned to a port for which
699 * loop doesn't have a pointer.
700 * This scenario would be possible if we allowed
701 * more than one port to be added and a subsystem
702 * was assigned to a port other than nvmet_loop_port.
708 nvmet_loop_port = port;
712 static void nvme_loop_remove_port(struct nvmet_port *port)
714 if (port == nvmet_loop_port)
715 nvmet_loop_port = NULL;
718 static struct nvmet_fabrics_ops nvme_loop_ops = {
719 .owner = THIS_MODULE,
720 .type = NVMF_TRTYPE_LOOP,
721 .add_port = nvme_loop_add_port,
722 .remove_port = nvme_loop_remove_port,
723 .queue_response = nvme_loop_queue_response,
724 .delete_ctrl = nvme_loop_delete_ctrl,
727 static struct nvmf_transport_ops nvme_loop_transport = {
729 .create_ctrl = nvme_loop_create_ctrl,
732 static int __init nvme_loop_init_module(void)
736 ret = nvmet_register_transport(&nvme_loop_ops);
739 return nvmf_register_transport(&nvme_loop_transport);
742 static void __exit nvme_loop_cleanup_module(void)
744 struct nvme_loop_ctrl *ctrl, *next;
746 nvmf_unregister_transport(&nvme_loop_transport);
747 nvmet_unregister_transport(&nvme_loop_ops);
749 mutex_lock(&nvme_loop_ctrl_mutex);
750 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list)
751 __nvme_loop_del_ctrl(ctrl);
752 mutex_unlock(&nvme_loop_ctrl_mutex);
754 flush_scheduled_work();
757 module_init(nvme_loop_init_module);
758 module_exit(nvme_loop_cleanup_module);
760 MODULE_LICENSE("GPL v2");
761 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */