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/blk-mq.h>
17 #include <linux/nvme.h>
18 #include <linux/module.h>
19 #include <linux/parser.h>
21 #include "../host/nvme.h"
22 #include "../host/fabrics.h"
24 #define NVME_LOOP_AQ_DEPTH 256
26 #define NVME_LOOP_MAX_SEGMENTS 256
29 * We handle AEN commands ourselves and don't even let the
30 * block layer know about them.
32 #define NVME_LOOP_NR_AEN_COMMANDS 1
33 #define NVME_LOOP_AQ_BLKMQ_DEPTH \
34 (NVME_LOOP_AQ_DEPTH - NVME_LOOP_NR_AEN_COMMANDS)
36 struct nvme_loop_iod {
37 struct nvme_request nvme_req;
38 struct nvme_command cmd;
39 struct nvme_completion rsp;
41 struct nvme_loop_queue *queue;
42 struct work_struct work;
43 struct sg_table sg_table;
44 struct scatterlist first_sgl[];
47 struct nvme_loop_ctrl {
49 struct nvme_loop_queue *queues;
52 struct blk_mq_tag_set admin_tag_set;
54 struct list_head list;
56 struct blk_mq_tag_set tag_set;
57 struct nvme_loop_iod async_event_iod;
58 struct nvme_ctrl ctrl;
60 struct nvmet_ctrl *target_ctrl;
61 struct work_struct delete_work;
62 struct work_struct reset_work;
65 static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl)
67 return container_of(ctrl, struct nvme_loop_ctrl, ctrl);
70 struct nvme_loop_queue {
71 struct nvmet_cq nvme_cq;
72 struct nvmet_sq nvme_sq;
73 struct nvme_loop_ctrl *ctrl;
76 static struct nvmet_port *nvmet_loop_port;
78 static LIST_HEAD(nvme_loop_ctrl_list);
79 static DEFINE_MUTEX(nvme_loop_ctrl_mutex);
81 static void nvme_loop_queue_response(struct nvmet_req *nvme_req);
82 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl);
84 static struct nvmet_fabrics_ops nvme_loop_ops;
86 static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue)
88 return queue - queue->ctrl->queues;
91 static void nvme_loop_complete_rq(struct request *req)
93 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
95 nvme_cleanup_cmd(req);
96 sg_free_table_chained(&iod->sg_table, true);
97 nvme_complete_rq(req);
100 static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue)
102 u32 queue_idx = nvme_loop_queue_idx(queue);
105 return queue->ctrl->admin_tag_set.tags[queue_idx];
106 return queue->ctrl->tag_set.tags[queue_idx - 1];
109 static void nvme_loop_queue_response(struct nvmet_req *req)
111 struct nvme_loop_queue *queue =
112 container_of(req->sq, struct nvme_loop_queue, nvme_sq);
113 struct nvme_completion *cqe = req->rsp;
116 * AEN requests are special as they don't time out and can
117 * survive any kind of queue freeze and often don't respond to
118 * aborts. We don't even bother to allocate a struct request
119 * for them but rather special case them here.
121 if (unlikely(nvme_loop_queue_idx(queue) == 0 &&
122 cqe->command_id >= NVME_LOOP_AQ_BLKMQ_DEPTH)) {
123 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
128 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id);
130 dev_err(queue->ctrl->ctrl.device,
131 "tag 0x%x on queue %d not found\n",
132 cqe->command_id, nvme_loop_queue_idx(queue));
136 nvme_end_request(rq, cqe->status, cqe->result);
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 nvme_req(rq)->status = 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(struct blk_mq_tag_set *set,
234 struct request *req, unsigned int hctx_idx,
235 unsigned int numa_node)
237 return nvme_loop_init_iod(set->driver_data, blk_mq_rq_to_pdu(req),
241 static int nvme_loop_init_admin_request(struct blk_mq_tag_set *set,
242 struct request *req, unsigned int hctx_idx,
243 unsigned int numa_node)
245 return nvme_loop_init_iod(set->driver_data, blk_mq_rq_to_pdu(req), 0);
248 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
249 unsigned int hctx_idx)
251 struct nvme_loop_ctrl *ctrl = data;
252 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1];
254 BUG_ON(hctx_idx >= ctrl->queue_count);
256 hctx->driver_data = queue;
260 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
261 unsigned int hctx_idx)
263 struct nvme_loop_ctrl *ctrl = data;
264 struct nvme_loop_queue *queue = &ctrl->queues[0];
266 BUG_ON(hctx_idx != 0);
268 hctx->driver_data = queue;
272 static const struct blk_mq_ops nvme_loop_mq_ops = {
273 .queue_rq = nvme_loop_queue_rq,
274 .complete = nvme_loop_complete_rq,
275 .init_request = nvme_loop_init_request,
276 .init_hctx = nvme_loop_init_hctx,
277 .timeout = nvme_loop_timeout,
280 static const struct blk_mq_ops nvme_loop_admin_mq_ops = {
281 .queue_rq = nvme_loop_queue_rq,
282 .complete = nvme_loop_complete_rq,
283 .init_request = nvme_loop_init_admin_request,
284 .init_hctx = nvme_loop_init_admin_hctx,
285 .timeout = nvme_loop_timeout,
288 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl)
290 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
291 blk_cleanup_queue(ctrl->ctrl.admin_q);
292 blk_mq_free_tag_set(&ctrl->admin_tag_set);
295 static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl)
297 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
299 if (list_empty(&ctrl->list))
302 mutex_lock(&nvme_loop_ctrl_mutex);
303 list_del(&ctrl->list);
304 mutex_unlock(&nvme_loop_ctrl_mutex);
307 blk_cleanup_queue(ctrl->ctrl.connect_q);
308 blk_mq_free_tag_set(&ctrl->tag_set);
311 nvmf_free_options(nctrl->opts);
316 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl)
320 for (i = 1; i < ctrl->queue_count; i++)
321 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
324 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl)
326 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
327 unsigned int nr_io_queues;
330 nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
331 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
332 if (ret || !nr_io_queues)
335 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues);
337 for (i = 1; i <= nr_io_queues; i++) {
338 ctrl->queues[i].ctrl = ctrl;
339 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq);
341 goto out_destroy_queues;
349 nvme_loop_destroy_io_queues(ctrl);
353 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl)
357 for (i = 1; i < ctrl->queue_count; i++) {
358 ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
366 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl)
370 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
371 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops;
372 ctrl->admin_tag_set.queue_depth = NVME_LOOP_AQ_BLKMQ_DEPTH;
373 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */
374 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
375 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
376 SG_CHUNK_SIZE * sizeof(struct scatterlist);
377 ctrl->admin_tag_set.driver_data = ctrl;
378 ctrl->admin_tag_set.nr_hw_queues = 1;
379 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
381 ctrl->queues[0].ctrl = ctrl;
382 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq);
385 ctrl->queue_count = 1;
387 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
391 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
392 if (IS_ERR(ctrl->ctrl.admin_q)) {
393 error = PTR_ERR(ctrl->ctrl.admin_q);
394 goto out_free_tagset;
397 error = nvmf_connect_admin_queue(&ctrl->ctrl);
399 goto out_cleanup_queue;
401 error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap);
403 dev_err(ctrl->ctrl.device,
404 "prop_get NVME_REG_CAP failed\n");
405 goto out_cleanup_queue;
409 min_t(int, NVME_CAP_MQES(ctrl->cap), ctrl->ctrl.sqsize);
411 error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
413 goto out_cleanup_queue;
415 ctrl->ctrl.max_hw_sectors =
416 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9);
418 error = nvme_init_identify(&ctrl->ctrl);
420 goto out_cleanup_queue;
422 nvme_start_keep_alive(&ctrl->ctrl);
427 blk_cleanup_queue(ctrl->ctrl.admin_q);
429 blk_mq_free_tag_set(&ctrl->admin_tag_set);
431 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
435 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl)
437 nvme_stop_keep_alive(&ctrl->ctrl);
439 if (ctrl->queue_count > 1) {
440 nvme_stop_queues(&ctrl->ctrl);
441 blk_mq_tagset_busy_iter(&ctrl->tag_set,
442 nvme_cancel_request, &ctrl->ctrl);
443 nvme_loop_destroy_io_queues(ctrl);
446 if (ctrl->ctrl.state == NVME_CTRL_LIVE)
447 nvme_shutdown_ctrl(&ctrl->ctrl);
449 blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
450 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
451 nvme_cancel_request, &ctrl->ctrl);
452 nvme_loop_destroy_admin_queue(ctrl);
455 static void nvme_loop_del_ctrl_work(struct work_struct *work)
457 struct nvme_loop_ctrl *ctrl = container_of(work,
458 struct nvme_loop_ctrl, delete_work);
460 nvme_uninit_ctrl(&ctrl->ctrl);
461 nvme_loop_shutdown_ctrl(ctrl);
462 nvme_put_ctrl(&ctrl->ctrl);
465 static int __nvme_loop_del_ctrl(struct nvme_loop_ctrl *ctrl)
467 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
470 if (!schedule_work(&ctrl->delete_work))
476 static int nvme_loop_del_ctrl(struct nvme_ctrl *nctrl)
478 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
481 ret = __nvme_loop_del_ctrl(ctrl);
485 flush_work(&ctrl->delete_work);
490 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl)
492 struct nvme_loop_ctrl *ctrl;
494 mutex_lock(&nvme_loop_ctrl_mutex);
495 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) {
496 if (ctrl->ctrl.cntlid == nctrl->cntlid)
497 __nvme_loop_del_ctrl(ctrl);
499 mutex_unlock(&nvme_loop_ctrl_mutex);
502 static void nvme_loop_reset_ctrl_work(struct work_struct *work)
504 struct nvme_loop_ctrl *ctrl = container_of(work,
505 struct nvme_loop_ctrl, reset_work);
509 nvme_loop_shutdown_ctrl(ctrl);
511 ret = nvme_loop_configure_admin_queue(ctrl);
515 ret = nvme_loop_init_io_queues(ctrl);
517 goto out_destroy_admin;
519 ret = nvme_loop_connect_io_queues(ctrl);
523 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
524 WARN_ON_ONCE(!changed);
526 nvme_queue_scan(&ctrl->ctrl);
527 nvme_queue_async_events(&ctrl->ctrl);
529 nvme_start_queues(&ctrl->ctrl);
534 nvme_loop_destroy_io_queues(ctrl);
536 nvme_loop_destroy_admin_queue(ctrl);
538 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
539 nvme_uninit_ctrl(&ctrl->ctrl);
540 nvme_put_ctrl(&ctrl->ctrl);
543 static int nvme_loop_reset_ctrl(struct nvme_ctrl *nctrl)
545 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
547 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
550 if (!schedule_work(&ctrl->reset_work))
553 flush_work(&ctrl->reset_work);
558 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
560 .module = THIS_MODULE,
562 .reg_read32 = nvmf_reg_read32,
563 .reg_read64 = nvmf_reg_read64,
564 .reg_write32 = nvmf_reg_write32,
565 .reset_ctrl = nvme_loop_reset_ctrl,
566 .free_ctrl = nvme_loop_free_ctrl,
567 .submit_async_event = nvme_loop_submit_async_event,
568 .delete_ctrl = nvme_loop_del_ctrl,
569 .get_subsysnqn = nvmf_get_subsysnqn,
572 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
576 ret = nvme_loop_init_io_queues(ctrl);
580 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
581 ctrl->tag_set.ops = &nvme_loop_mq_ops;
582 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
583 ctrl->tag_set.reserved_tags = 1; /* fabric connect */
584 ctrl->tag_set.numa_node = NUMA_NO_NODE;
585 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
586 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
587 SG_CHUNK_SIZE * sizeof(struct scatterlist);
588 ctrl->tag_set.driver_data = ctrl;
589 ctrl->tag_set.nr_hw_queues = ctrl->queue_count - 1;
590 ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
591 ctrl->ctrl.tagset = &ctrl->tag_set;
593 ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
595 goto out_destroy_queues;
597 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
598 if (IS_ERR(ctrl->ctrl.connect_q)) {
599 ret = PTR_ERR(ctrl->ctrl.connect_q);
600 goto out_free_tagset;
603 ret = nvme_loop_connect_io_queues(ctrl);
605 goto out_cleanup_connect_q;
609 out_cleanup_connect_q:
610 blk_cleanup_queue(ctrl->ctrl.connect_q);
612 blk_mq_free_tag_set(&ctrl->tag_set);
614 nvme_loop_destroy_io_queues(ctrl);
618 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
619 struct nvmf_ctrl_options *opts)
621 struct nvme_loop_ctrl *ctrl;
625 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
627 return ERR_PTR(-ENOMEM);
628 ctrl->ctrl.opts = opts;
629 INIT_LIST_HEAD(&ctrl->list);
631 INIT_WORK(&ctrl->delete_work, nvme_loop_del_ctrl_work);
632 INIT_WORK(&ctrl->reset_work, nvme_loop_reset_ctrl_work);
634 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops,
635 0 /* no quirks, we're perfect! */);
639 spin_lock_init(&ctrl->lock);
643 ctrl->ctrl.sqsize = opts->queue_size - 1;
644 ctrl->ctrl.kato = opts->kato;
646 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),
649 goto out_uninit_ctrl;
651 ret = nvme_loop_configure_admin_queue(ctrl);
653 goto out_free_queues;
655 if (opts->queue_size > ctrl->ctrl.maxcmd) {
656 /* warn if maxcmd is lower than queue_size */
657 dev_warn(ctrl->ctrl.device,
658 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
659 opts->queue_size, ctrl->ctrl.maxcmd);
660 opts->queue_size = ctrl->ctrl.maxcmd;
663 if (opts->nr_io_queues) {
664 ret = nvme_loop_create_io_queues(ctrl);
666 goto out_remove_admin_queue;
669 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0);
671 dev_info(ctrl->ctrl.device,
672 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
674 kref_get(&ctrl->ctrl.kref);
676 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
677 WARN_ON_ONCE(!changed);
679 mutex_lock(&nvme_loop_ctrl_mutex);
680 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list);
681 mutex_unlock(&nvme_loop_ctrl_mutex);
683 if (opts->nr_io_queues) {
684 nvme_queue_scan(&ctrl->ctrl);
685 nvme_queue_async_events(&ctrl->ctrl);
690 out_remove_admin_queue:
691 nvme_loop_destroy_admin_queue(ctrl);
695 nvme_uninit_ctrl(&ctrl->ctrl);
697 nvme_put_ctrl(&ctrl->ctrl);
703 static int nvme_loop_add_port(struct nvmet_port *port)
706 * XXX: disalow adding more than one port so
707 * there is no connection rejections when a
708 * a subsystem is assigned to a port for which
709 * loop doesn't have a pointer.
710 * This scenario would be possible if we allowed
711 * more than one port to be added and a subsystem
712 * was assigned to a port other than nvmet_loop_port.
718 nvmet_loop_port = port;
722 static void nvme_loop_remove_port(struct nvmet_port *port)
724 if (port == nvmet_loop_port)
725 nvmet_loop_port = NULL;
728 static struct nvmet_fabrics_ops nvme_loop_ops = {
729 .owner = THIS_MODULE,
730 .type = NVMF_TRTYPE_LOOP,
731 .add_port = nvme_loop_add_port,
732 .remove_port = nvme_loop_remove_port,
733 .queue_response = nvme_loop_queue_response,
734 .delete_ctrl = nvme_loop_delete_ctrl,
737 static struct nvmf_transport_ops nvme_loop_transport = {
739 .create_ctrl = nvme_loop_create_ctrl,
742 static int __init nvme_loop_init_module(void)
746 ret = nvmet_register_transport(&nvme_loop_ops);
750 ret = nvmf_register_transport(&nvme_loop_transport);
752 nvmet_unregister_transport(&nvme_loop_ops);
757 static void __exit nvme_loop_cleanup_module(void)
759 struct nvme_loop_ctrl *ctrl, *next;
761 nvmf_unregister_transport(&nvme_loop_transport);
762 nvmet_unregister_transport(&nvme_loop_ops);
764 mutex_lock(&nvme_loop_ctrl_mutex);
765 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list)
766 __nvme_loop_del_ctrl(ctrl);
767 mutex_unlock(&nvme_loop_ctrl_mutex);
769 flush_scheduled_work();
772 module_init(nvme_loop_init_module);
773 module_exit(nvme_loop_cleanup_module);
775 MODULE_LICENSE("GPL v2");
776 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */