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_MAX_SEGMENTS 256
26 struct nvme_loop_iod
{
27 struct nvme_request nvme_req
;
28 struct nvme_command cmd
;
29 struct nvme_completion rsp
;
31 struct nvme_loop_queue
*queue
;
32 struct work_struct work
;
33 struct sg_table sg_table
;
34 struct scatterlist first_sgl
[];
37 struct nvme_loop_ctrl
{
38 struct nvme_loop_queue
*queues
;
40 struct blk_mq_tag_set admin_tag_set
;
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
;
47 struct nvmet_ctrl
*target_ctrl
;
50 static inline struct nvme_loop_ctrl
*to_loop_ctrl(struct nvme_ctrl
*ctrl
)
52 return container_of(ctrl
, struct nvme_loop_ctrl
, ctrl
);
55 enum nvme_loop_queue_flags
{
59 struct nvme_loop_queue
{
60 struct nvmet_cq nvme_cq
;
61 struct nvmet_sq nvme_sq
;
62 struct nvme_loop_ctrl
*ctrl
;
66 static struct nvmet_port
*nvmet_loop_port
;
68 static LIST_HEAD(nvme_loop_ctrl_list
);
69 static DEFINE_MUTEX(nvme_loop_ctrl_mutex
);
71 static void nvme_loop_queue_response(struct nvmet_req
*nvme_req
);
72 static void nvme_loop_delete_ctrl(struct nvmet_ctrl
*ctrl
);
74 static const struct nvmet_fabrics_ops nvme_loop_ops
;
76 static inline int nvme_loop_queue_idx(struct nvme_loop_queue
*queue
)
78 return queue
- queue
->ctrl
->queues
;
81 static void nvme_loop_complete_rq(struct request
*req
)
83 struct nvme_loop_iod
*iod
= blk_mq_rq_to_pdu(req
);
85 nvme_cleanup_cmd(req
);
86 sg_free_table_chained(&iod
->sg_table
, true);
87 nvme_complete_rq(req
);
90 static struct blk_mq_tags
*nvme_loop_tagset(struct nvme_loop_queue
*queue
)
92 u32 queue_idx
= nvme_loop_queue_idx(queue
);
95 return queue
->ctrl
->admin_tag_set
.tags
[queue_idx
];
96 return queue
->ctrl
->tag_set
.tags
[queue_idx
- 1];
99 static void nvme_loop_queue_response(struct nvmet_req
*req
)
101 struct nvme_loop_queue
*queue
=
102 container_of(req
->sq
, struct nvme_loop_queue
, nvme_sq
);
103 struct nvme_completion
*cqe
= req
->rsp
;
106 * AEN requests are special as they don't time out and can
107 * survive any kind of queue freeze and often don't respond to
108 * aborts. We don't even bother to allocate a struct request
109 * for them but rather special case them here.
111 if (unlikely(nvme_loop_queue_idx(queue
) == 0 &&
112 cqe
->command_id
>= NVME_AQ_BLK_MQ_DEPTH
)) {
113 nvme_complete_async_event(&queue
->ctrl
->ctrl
, cqe
->status
,
118 rq
= blk_mq_tag_to_rq(nvme_loop_tagset(queue
), cqe
->command_id
);
120 dev_err(queue
->ctrl
->ctrl
.device
,
121 "tag 0x%x on queue %d not found\n",
122 cqe
->command_id
, nvme_loop_queue_idx(queue
));
126 nvme_end_request(rq
, cqe
->status
, cqe
->result
);
130 static void nvme_loop_execute_work(struct work_struct
*work
)
132 struct nvme_loop_iod
*iod
=
133 container_of(work
, struct nvme_loop_iod
, work
);
135 nvmet_req_execute(&iod
->req
);
138 static enum blk_eh_timer_return
139 nvme_loop_timeout(struct request
*rq
, bool reserved
)
141 struct nvme_loop_iod
*iod
= blk_mq_rq_to_pdu(rq
);
143 /* queue error recovery */
144 nvme_reset_ctrl(&iod
->queue
->ctrl
->ctrl
);
146 /* fail with DNR on admin cmd timeout */
147 nvme_req(rq
)->status
= NVME_SC_ABORT_REQ
| NVME_SC_DNR
;
149 return BLK_EH_HANDLED
;
152 static blk_status_t
nvme_loop_queue_rq(struct blk_mq_hw_ctx
*hctx
,
153 const struct blk_mq_queue_data
*bd
)
155 struct nvme_ns
*ns
= hctx
->queue
->queuedata
;
156 struct nvme_loop_queue
*queue
= hctx
->driver_data
;
157 struct request
*req
= bd
->rq
;
158 struct nvme_loop_iod
*iod
= blk_mq_rq_to_pdu(req
);
161 ret
= nvmf_check_if_ready(&queue
->ctrl
->ctrl
, req
,
162 test_bit(NVME_LOOP_Q_LIVE
, &queue
->flags
), true);
166 ret
= nvme_setup_cmd(ns
, req
, &iod
->cmd
);
170 blk_mq_start_request(req
);
171 iod
->cmd
.common
.flags
|= NVME_CMD_SGL_METABUF
;
172 iod
->req
.port
= nvmet_loop_port
;
173 if (!nvmet_req_init(&iod
->req
, &queue
->nvme_cq
,
174 &queue
->nvme_sq
, &nvme_loop_ops
))
177 if (blk_rq_payload_bytes(req
)) {
178 iod
->sg_table
.sgl
= iod
->first_sgl
;
179 if (sg_alloc_table_chained(&iod
->sg_table
,
180 blk_rq_nr_phys_segments(req
),
182 return BLK_STS_RESOURCE
;
184 iod
->req
.sg
= iod
->sg_table
.sgl
;
185 iod
->req
.sg_cnt
= blk_rq_map_sg(req
->q
, req
, iod
->sg_table
.sgl
);
186 iod
->req
.transfer_len
= blk_rq_payload_bytes(req
);
189 schedule_work(&iod
->work
);
193 static void nvme_loop_submit_async_event(struct nvme_ctrl
*arg
)
195 struct nvme_loop_ctrl
*ctrl
= to_loop_ctrl(arg
);
196 struct nvme_loop_queue
*queue
= &ctrl
->queues
[0];
197 struct nvme_loop_iod
*iod
= &ctrl
->async_event_iod
;
199 memset(&iod
->cmd
, 0, sizeof(iod
->cmd
));
200 iod
->cmd
.common
.opcode
= nvme_admin_async_event
;
201 iod
->cmd
.common
.command_id
= NVME_AQ_BLK_MQ_DEPTH
;
202 iod
->cmd
.common
.flags
|= NVME_CMD_SGL_METABUF
;
204 if (!nvmet_req_init(&iod
->req
, &queue
->nvme_cq
, &queue
->nvme_sq
,
206 dev_err(ctrl
->ctrl
.device
, "failed async event work\n");
210 schedule_work(&iod
->work
);
213 static int nvme_loop_init_iod(struct nvme_loop_ctrl
*ctrl
,
214 struct nvme_loop_iod
*iod
, unsigned int queue_idx
)
216 iod
->req
.cmd
= &iod
->cmd
;
217 iod
->req
.rsp
= &iod
->rsp
;
218 iod
->queue
= &ctrl
->queues
[queue_idx
];
219 INIT_WORK(&iod
->work
, nvme_loop_execute_work
);
223 static int nvme_loop_init_request(struct blk_mq_tag_set
*set
,
224 struct request
*req
, unsigned int hctx_idx
,
225 unsigned int numa_node
)
227 struct nvme_loop_ctrl
*ctrl
= set
->driver_data
;
229 return nvme_loop_init_iod(ctrl
, blk_mq_rq_to_pdu(req
),
230 (set
== &ctrl
->tag_set
) ? hctx_idx
+ 1 : 0);
233 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
234 unsigned int hctx_idx
)
236 struct nvme_loop_ctrl
*ctrl
= data
;
237 struct nvme_loop_queue
*queue
= &ctrl
->queues
[hctx_idx
+ 1];
239 BUG_ON(hctx_idx
>= ctrl
->ctrl
.queue_count
);
241 hctx
->driver_data
= queue
;
245 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
246 unsigned int hctx_idx
)
248 struct nvme_loop_ctrl
*ctrl
= data
;
249 struct nvme_loop_queue
*queue
= &ctrl
->queues
[0];
251 BUG_ON(hctx_idx
!= 0);
253 hctx
->driver_data
= queue
;
257 static const struct blk_mq_ops nvme_loop_mq_ops
= {
258 .queue_rq
= nvme_loop_queue_rq
,
259 .complete
= nvme_loop_complete_rq
,
260 .init_request
= nvme_loop_init_request
,
261 .init_hctx
= nvme_loop_init_hctx
,
262 .timeout
= nvme_loop_timeout
,
265 static const struct blk_mq_ops nvme_loop_admin_mq_ops
= {
266 .queue_rq
= nvme_loop_queue_rq
,
267 .complete
= nvme_loop_complete_rq
,
268 .init_request
= nvme_loop_init_request
,
269 .init_hctx
= nvme_loop_init_admin_hctx
,
270 .timeout
= nvme_loop_timeout
,
273 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl
*ctrl
)
275 clear_bit(NVME_LOOP_Q_LIVE
, &ctrl
->queues
[0].flags
);
276 nvmet_sq_destroy(&ctrl
->queues
[0].nvme_sq
);
277 blk_cleanup_queue(ctrl
->ctrl
.admin_q
);
278 blk_mq_free_tag_set(&ctrl
->admin_tag_set
);
281 static void nvme_loop_free_ctrl(struct nvme_ctrl
*nctrl
)
283 struct nvme_loop_ctrl
*ctrl
= to_loop_ctrl(nctrl
);
285 if (list_empty(&ctrl
->list
))
288 mutex_lock(&nvme_loop_ctrl_mutex
);
289 list_del(&ctrl
->list
);
290 mutex_unlock(&nvme_loop_ctrl_mutex
);
293 blk_cleanup_queue(ctrl
->ctrl
.connect_q
);
294 blk_mq_free_tag_set(&ctrl
->tag_set
);
297 nvmf_free_options(nctrl
->opts
);
302 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl
*ctrl
)
306 for (i
= 1; i
< ctrl
->ctrl
.queue_count
; i
++) {
307 clear_bit(NVME_LOOP_Q_LIVE
, &ctrl
->queues
[i
].flags
);
308 nvmet_sq_destroy(&ctrl
->queues
[i
].nvme_sq
);
312 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl
*ctrl
)
314 struct nvmf_ctrl_options
*opts
= ctrl
->ctrl
.opts
;
315 unsigned int nr_io_queues
;
318 nr_io_queues
= min(opts
->nr_io_queues
, num_online_cpus());
319 ret
= nvme_set_queue_count(&ctrl
->ctrl
, &nr_io_queues
);
320 if (ret
|| !nr_io_queues
)
323 dev_info(ctrl
->ctrl
.device
, "creating %d I/O queues.\n", nr_io_queues
);
325 for (i
= 1; i
<= nr_io_queues
; i
++) {
326 ctrl
->queues
[i
].ctrl
= ctrl
;
327 ret
= nvmet_sq_init(&ctrl
->queues
[i
].nvme_sq
);
329 goto out_destroy_queues
;
331 ctrl
->ctrl
.queue_count
++;
337 nvme_loop_destroy_io_queues(ctrl
);
341 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl
*ctrl
)
345 for (i
= 1; i
< ctrl
->ctrl
.queue_count
; i
++) {
346 ret
= nvmf_connect_io_queue(&ctrl
->ctrl
, i
);
349 set_bit(NVME_LOOP_Q_LIVE
, &ctrl
->queues
[i
].flags
);
355 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl
*ctrl
)
359 memset(&ctrl
->admin_tag_set
, 0, sizeof(ctrl
->admin_tag_set
));
360 ctrl
->admin_tag_set
.ops
= &nvme_loop_admin_mq_ops
;
361 ctrl
->admin_tag_set
.queue_depth
= NVME_AQ_MQ_TAG_DEPTH
;
362 ctrl
->admin_tag_set
.reserved_tags
= 2; /* connect + keep-alive */
363 ctrl
->admin_tag_set
.numa_node
= NUMA_NO_NODE
;
364 ctrl
->admin_tag_set
.cmd_size
= sizeof(struct nvme_loop_iod
) +
365 SG_CHUNK_SIZE
* sizeof(struct scatterlist
);
366 ctrl
->admin_tag_set
.driver_data
= ctrl
;
367 ctrl
->admin_tag_set
.nr_hw_queues
= 1;
368 ctrl
->admin_tag_set
.timeout
= ADMIN_TIMEOUT
;
369 ctrl
->admin_tag_set
.flags
= BLK_MQ_F_NO_SCHED
;
371 ctrl
->queues
[0].ctrl
= ctrl
;
372 error
= nvmet_sq_init(&ctrl
->queues
[0].nvme_sq
);
375 ctrl
->ctrl
.queue_count
= 1;
377 error
= blk_mq_alloc_tag_set(&ctrl
->admin_tag_set
);
380 ctrl
->ctrl
.admin_tagset
= &ctrl
->admin_tag_set
;
382 ctrl
->ctrl
.admin_q
= blk_mq_init_queue(&ctrl
->admin_tag_set
);
383 if (IS_ERR(ctrl
->ctrl
.admin_q
)) {
384 error
= PTR_ERR(ctrl
->ctrl
.admin_q
);
385 goto out_free_tagset
;
388 error
= nvmf_connect_admin_queue(&ctrl
->ctrl
);
390 goto out_cleanup_queue
;
392 set_bit(NVME_LOOP_Q_LIVE
, &ctrl
->queues
[0].flags
);
394 error
= nvmf_reg_read64(&ctrl
->ctrl
, NVME_REG_CAP
, &ctrl
->ctrl
.cap
);
396 dev_err(ctrl
->ctrl
.device
,
397 "prop_get NVME_REG_CAP failed\n");
398 goto out_cleanup_queue
;
402 min_t(int, NVME_CAP_MQES(ctrl
->ctrl
.cap
), ctrl
->ctrl
.sqsize
);
404 error
= nvme_enable_ctrl(&ctrl
->ctrl
, ctrl
->ctrl
.cap
);
406 goto out_cleanup_queue
;
408 ctrl
->ctrl
.max_hw_sectors
=
409 (NVME_LOOP_MAX_SEGMENTS
- 1) << (PAGE_SHIFT
- 9);
411 error
= nvme_init_identify(&ctrl
->ctrl
);
413 goto out_cleanup_queue
;
418 blk_cleanup_queue(ctrl
->ctrl
.admin_q
);
420 blk_mq_free_tag_set(&ctrl
->admin_tag_set
);
422 nvmet_sq_destroy(&ctrl
->queues
[0].nvme_sq
);
426 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl
*ctrl
)
428 if (ctrl
->ctrl
.queue_count
> 1) {
429 nvme_stop_queues(&ctrl
->ctrl
);
430 blk_mq_tagset_busy_iter(&ctrl
->tag_set
,
431 nvme_cancel_request
, &ctrl
->ctrl
);
432 nvme_loop_destroy_io_queues(ctrl
);
435 if (ctrl
->ctrl
.state
== NVME_CTRL_LIVE
)
436 nvme_shutdown_ctrl(&ctrl
->ctrl
);
438 blk_mq_quiesce_queue(ctrl
->ctrl
.admin_q
);
439 blk_mq_tagset_busy_iter(&ctrl
->admin_tag_set
,
440 nvme_cancel_request
, &ctrl
->ctrl
);
441 blk_mq_unquiesce_queue(ctrl
->ctrl
.admin_q
);
442 nvme_loop_destroy_admin_queue(ctrl
);
445 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl
*ctrl
)
447 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl
));
450 static void nvme_loop_delete_ctrl(struct nvmet_ctrl
*nctrl
)
452 struct nvme_loop_ctrl
*ctrl
;
454 mutex_lock(&nvme_loop_ctrl_mutex
);
455 list_for_each_entry(ctrl
, &nvme_loop_ctrl_list
, list
) {
456 if (ctrl
->ctrl
.cntlid
== nctrl
->cntlid
)
457 nvme_delete_ctrl(&ctrl
->ctrl
);
459 mutex_unlock(&nvme_loop_ctrl_mutex
);
462 static void nvme_loop_reset_ctrl_work(struct work_struct
*work
)
464 struct nvme_loop_ctrl
*ctrl
=
465 container_of(work
, struct nvme_loop_ctrl
, ctrl
.reset_work
);
469 nvme_stop_ctrl(&ctrl
->ctrl
);
470 nvme_loop_shutdown_ctrl(ctrl
);
472 if (!nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_CONNECTING
)) {
473 /* state change failure should never happen */
478 ret
= nvme_loop_configure_admin_queue(ctrl
);
482 ret
= nvme_loop_init_io_queues(ctrl
);
484 goto out_destroy_admin
;
486 ret
= nvme_loop_connect_io_queues(ctrl
);
490 blk_mq_update_nr_hw_queues(&ctrl
->tag_set
,
491 ctrl
->ctrl
.queue_count
- 1);
493 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
494 WARN_ON_ONCE(!changed
);
496 nvme_start_ctrl(&ctrl
->ctrl
);
501 nvme_loop_destroy_io_queues(ctrl
);
503 nvme_loop_destroy_admin_queue(ctrl
);
505 dev_warn(ctrl
->ctrl
.device
, "Removing after reset failure\n");
506 nvme_uninit_ctrl(&ctrl
->ctrl
);
507 nvme_put_ctrl(&ctrl
->ctrl
);
510 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops
= {
512 .module
= THIS_MODULE
,
513 .flags
= NVME_F_FABRICS
,
514 .reg_read32
= nvmf_reg_read32
,
515 .reg_read64
= nvmf_reg_read64
,
516 .reg_write32
= nvmf_reg_write32
,
517 .free_ctrl
= nvme_loop_free_ctrl
,
518 .submit_async_event
= nvme_loop_submit_async_event
,
519 .delete_ctrl
= nvme_loop_delete_ctrl_host
,
522 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl
*ctrl
)
526 ret
= nvme_loop_init_io_queues(ctrl
);
530 memset(&ctrl
->tag_set
, 0, sizeof(ctrl
->tag_set
));
531 ctrl
->tag_set
.ops
= &nvme_loop_mq_ops
;
532 ctrl
->tag_set
.queue_depth
= ctrl
->ctrl
.opts
->queue_size
;
533 ctrl
->tag_set
.reserved_tags
= 1; /* fabric connect */
534 ctrl
->tag_set
.numa_node
= NUMA_NO_NODE
;
535 ctrl
->tag_set
.flags
= BLK_MQ_F_SHOULD_MERGE
;
536 ctrl
->tag_set
.cmd_size
= sizeof(struct nvme_loop_iod
) +
537 SG_CHUNK_SIZE
* sizeof(struct scatterlist
);
538 ctrl
->tag_set
.driver_data
= ctrl
;
539 ctrl
->tag_set
.nr_hw_queues
= ctrl
->ctrl
.queue_count
- 1;
540 ctrl
->tag_set
.timeout
= NVME_IO_TIMEOUT
;
541 ctrl
->ctrl
.tagset
= &ctrl
->tag_set
;
543 ret
= blk_mq_alloc_tag_set(&ctrl
->tag_set
);
545 goto out_destroy_queues
;
547 ctrl
->ctrl
.connect_q
= blk_mq_init_queue(&ctrl
->tag_set
);
548 if (IS_ERR(ctrl
->ctrl
.connect_q
)) {
549 ret
= PTR_ERR(ctrl
->ctrl
.connect_q
);
550 goto out_free_tagset
;
553 ret
= nvme_loop_connect_io_queues(ctrl
);
555 goto out_cleanup_connect_q
;
559 out_cleanup_connect_q
:
560 blk_cleanup_queue(ctrl
->ctrl
.connect_q
);
562 blk_mq_free_tag_set(&ctrl
->tag_set
);
564 nvme_loop_destroy_io_queues(ctrl
);
568 static struct nvme_ctrl
*nvme_loop_create_ctrl(struct device
*dev
,
569 struct nvmf_ctrl_options
*opts
)
571 struct nvme_loop_ctrl
*ctrl
;
575 ctrl
= kzalloc(sizeof(*ctrl
), GFP_KERNEL
);
577 return ERR_PTR(-ENOMEM
);
578 ctrl
->ctrl
.opts
= opts
;
579 INIT_LIST_HEAD(&ctrl
->list
);
581 INIT_WORK(&ctrl
->ctrl
.reset_work
, nvme_loop_reset_ctrl_work
);
583 ret
= nvme_init_ctrl(&ctrl
->ctrl
, dev
, &nvme_loop_ctrl_ops
,
584 0 /* no quirks, we're perfect! */);
590 ctrl
->ctrl
.sqsize
= opts
->queue_size
- 1;
591 ctrl
->ctrl
.kato
= opts
->kato
;
593 ctrl
->queues
= kcalloc(opts
->nr_io_queues
+ 1, sizeof(*ctrl
->queues
),
596 goto out_uninit_ctrl
;
598 ret
= nvme_loop_configure_admin_queue(ctrl
);
600 goto out_free_queues
;
602 if (opts
->queue_size
> ctrl
->ctrl
.maxcmd
) {
603 /* warn if maxcmd is lower than queue_size */
604 dev_warn(ctrl
->ctrl
.device
,
605 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
606 opts
->queue_size
, ctrl
->ctrl
.maxcmd
);
607 opts
->queue_size
= ctrl
->ctrl
.maxcmd
;
610 if (opts
->nr_io_queues
) {
611 ret
= nvme_loop_create_io_queues(ctrl
);
613 goto out_remove_admin_queue
;
616 nvme_loop_init_iod(ctrl
, &ctrl
->async_event_iod
, 0);
618 dev_info(ctrl
->ctrl
.device
,
619 "new ctrl: \"%s\"\n", ctrl
->ctrl
.opts
->subsysnqn
);
621 nvme_get_ctrl(&ctrl
->ctrl
);
623 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
624 WARN_ON_ONCE(!changed
);
626 mutex_lock(&nvme_loop_ctrl_mutex
);
627 list_add_tail(&ctrl
->list
, &nvme_loop_ctrl_list
);
628 mutex_unlock(&nvme_loop_ctrl_mutex
);
630 nvme_start_ctrl(&ctrl
->ctrl
);
634 out_remove_admin_queue
:
635 nvme_loop_destroy_admin_queue(ctrl
);
639 nvme_uninit_ctrl(&ctrl
->ctrl
);
641 nvme_put_ctrl(&ctrl
->ctrl
);
647 static int nvme_loop_add_port(struct nvmet_port
*port
)
650 * XXX: disalow adding more than one port so
651 * there is no connection rejections when a
652 * a subsystem is assigned to a port for which
653 * loop doesn't have a pointer.
654 * This scenario would be possible if we allowed
655 * more than one port to be added and a subsystem
656 * was assigned to a port other than nvmet_loop_port.
662 nvmet_loop_port
= port
;
666 static void nvme_loop_remove_port(struct nvmet_port
*port
)
668 if (port
== nvmet_loop_port
)
669 nvmet_loop_port
= NULL
;
672 static const struct nvmet_fabrics_ops nvme_loop_ops
= {
673 .owner
= THIS_MODULE
,
674 .type
= NVMF_TRTYPE_LOOP
,
675 .add_port
= nvme_loop_add_port
,
676 .remove_port
= nvme_loop_remove_port
,
677 .queue_response
= nvme_loop_queue_response
,
678 .delete_ctrl
= nvme_loop_delete_ctrl
,
681 static struct nvmf_transport_ops nvme_loop_transport
= {
683 .module
= THIS_MODULE
,
684 .create_ctrl
= nvme_loop_create_ctrl
,
687 static int __init
nvme_loop_init_module(void)
691 ret
= nvmet_register_transport(&nvme_loop_ops
);
695 ret
= nvmf_register_transport(&nvme_loop_transport
);
697 nvmet_unregister_transport(&nvme_loop_ops
);
702 static void __exit
nvme_loop_cleanup_module(void)
704 struct nvme_loop_ctrl
*ctrl
, *next
;
706 nvmf_unregister_transport(&nvme_loop_transport
);
707 nvmet_unregister_transport(&nvme_loop_ops
);
709 mutex_lock(&nvme_loop_ctrl_mutex
);
710 list_for_each_entry_safe(ctrl
, next
, &nvme_loop_ctrl_list
, list
)
711 nvme_delete_ctrl(&ctrl
->ctrl
);
712 mutex_unlock(&nvme_loop_ctrl_mutex
);
714 flush_workqueue(nvme_delete_wq
);
717 module_init(nvme_loop_init_module
);
718 module_exit(nvme_loop_cleanup_module
);
720 MODULE_LICENSE("GPL v2");
721 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */