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 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 inline blk_status_t
nvme_loop_is_ready(struct nvme_loop_queue
*queue
,
155 if (unlikely(!test_bit(NVME_LOOP_Q_LIVE
, &queue
->flags
)))
156 return nvmf_check_init_req(&queue
->ctrl
->ctrl
, rq
);
160 static blk_status_t
nvme_loop_queue_rq(struct blk_mq_hw_ctx
*hctx
,
161 const struct blk_mq_queue_data
*bd
)
163 struct nvme_ns
*ns
= hctx
->queue
->queuedata
;
164 struct nvme_loop_queue
*queue
= hctx
->driver_data
;
165 struct request
*req
= bd
->rq
;
166 struct nvme_loop_iod
*iod
= blk_mq_rq_to_pdu(req
);
169 ret
= nvme_loop_is_ready(queue
, req
);
173 ret
= nvme_setup_cmd(ns
, req
, &iod
->cmd
);
177 blk_mq_start_request(req
);
178 iod
->cmd
.common
.flags
|= NVME_CMD_SGL_METABUF
;
179 iod
->req
.port
= nvmet_loop_port
;
180 if (!nvmet_req_init(&iod
->req
, &queue
->nvme_cq
,
181 &queue
->nvme_sq
, &nvme_loop_ops
))
184 if (blk_rq_bytes(req
)) {
185 iod
->sg_table
.sgl
= iod
->first_sgl
;
186 if (sg_alloc_table_chained(&iod
->sg_table
,
187 blk_rq_nr_phys_segments(req
),
189 return BLK_STS_RESOURCE
;
191 iod
->req
.sg
= iod
->sg_table
.sgl
;
192 iod
->req
.sg_cnt
= blk_rq_map_sg(req
->q
, req
, iod
->sg_table
.sgl
);
193 iod
->req
.transfer_len
= blk_rq_bytes(req
);
196 schedule_work(&iod
->work
);
200 static void nvme_loop_submit_async_event(struct nvme_ctrl
*arg
)
202 struct nvme_loop_ctrl
*ctrl
= to_loop_ctrl(arg
);
203 struct nvme_loop_queue
*queue
= &ctrl
->queues
[0];
204 struct nvme_loop_iod
*iod
= &ctrl
->async_event_iod
;
206 memset(&iod
->cmd
, 0, sizeof(iod
->cmd
));
207 iod
->cmd
.common
.opcode
= nvme_admin_async_event
;
208 iod
->cmd
.common
.command_id
= NVME_AQ_BLK_MQ_DEPTH
;
209 iod
->cmd
.common
.flags
|= NVME_CMD_SGL_METABUF
;
211 if (!nvmet_req_init(&iod
->req
, &queue
->nvme_cq
, &queue
->nvme_sq
,
213 dev_err(ctrl
->ctrl
.device
, "failed async event work\n");
217 schedule_work(&iod
->work
);
220 static int nvme_loop_init_iod(struct nvme_loop_ctrl
*ctrl
,
221 struct nvme_loop_iod
*iod
, unsigned int queue_idx
)
223 iod
->req
.cmd
= &iod
->cmd
;
224 iod
->req
.rsp
= &iod
->rsp
;
225 iod
->queue
= &ctrl
->queues
[queue_idx
];
226 INIT_WORK(&iod
->work
, nvme_loop_execute_work
);
230 static int nvme_loop_init_request(struct blk_mq_tag_set
*set
,
231 struct request
*req
, unsigned int hctx_idx
,
232 unsigned int numa_node
)
234 struct nvme_loop_ctrl
*ctrl
= set
->driver_data
;
236 return nvme_loop_init_iod(ctrl
, blk_mq_rq_to_pdu(req
),
237 (set
== &ctrl
->tag_set
) ? hctx_idx
+ 1 : 0);
240 static int nvme_loop_init_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
241 unsigned int hctx_idx
)
243 struct nvme_loop_ctrl
*ctrl
= data
;
244 struct nvme_loop_queue
*queue
= &ctrl
->queues
[hctx_idx
+ 1];
246 BUG_ON(hctx_idx
>= ctrl
->ctrl
.queue_count
);
248 hctx
->driver_data
= queue
;
252 static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
253 unsigned int hctx_idx
)
255 struct nvme_loop_ctrl
*ctrl
= data
;
256 struct nvme_loop_queue
*queue
= &ctrl
->queues
[0];
258 BUG_ON(hctx_idx
!= 0);
260 hctx
->driver_data
= queue
;
264 static const struct blk_mq_ops nvme_loop_mq_ops
= {
265 .queue_rq
= nvme_loop_queue_rq
,
266 .complete
= nvme_loop_complete_rq
,
267 .init_request
= nvme_loop_init_request
,
268 .init_hctx
= nvme_loop_init_hctx
,
269 .timeout
= nvme_loop_timeout
,
272 static const struct blk_mq_ops nvme_loop_admin_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_admin_hctx
,
277 .timeout
= nvme_loop_timeout
,
280 static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl
*ctrl
)
282 clear_bit(NVME_LOOP_Q_LIVE
, &ctrl
->queues
[0].flags
);
283 nvmet_sq_destroy(&ctrl
->queues
[0].nvme_sq
);
284 blk_cleanup_queue(ctrl
->ctrl
.admin_q
);
285 blk_mq_free_tag_set(&ctrl
->admin_tag_set
);
288 static void nvme_loop_free_ctrl(struct nvme_ctrl
*nctrl
)
290 struct nvme_loop_ctrl
*ctrl
= to_loop_ctrl(nctrl
);
292 if (list_empty(&ctrl
->list
))
295 mutex_lock(&nvme_loop_ctrl_mutex
);
296 list_del(&ctrl
->list
);
297 mutex_unlock(&nvme_loop_ctrl_mutex
);
300 blk_cleanup_queue(ctrl
->ctrl
.connect_q
);
301 blk_mq_free_tag_set(&ctrl
->tag_set
);
304 nvmf_free_options(nctrl
->opts
);
309 static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl
*ctrl
)
313 for (i
= 1; i
< ctrl
->ctrl
.queue_count
; i
++) {
314 clear_bit(NVME_LOOP_Q_LIVE
, &ctrl
->queues
[i
].flags
);
315 nvmet_sq_destroy(&ctrl
->queues
[i
].nvme_sq
);
319 static int nvme_loop_init_io_queues(struct nvme_loop_ctrl
*ctrl
)
321 struct nvmf_ctrl_options
*opts
= ctrl
->ctrl
.opts
;
322 unsigned int nr_io_queues
;
325 nr_io_queues
= min(opts
->nr_io_queues
, num_online_cpus());
326 ret
= nvme_set_queue_count(&ctrl
->ctrl
, &nr_io_queues
);
327 if (ret
|| !nr_io_queues
)
330 dev_info(ctrl
->ctrl
.device
, "creating %d I/O queues.\n", nr_io_queues
);
332 for (i
= 1; i
<= nr_io_queues
; i
++) {
333 ctrl
->queues
[i
].ctrl
= ctrl
;
334 ret
= nvmet_sq_init(&ctrl
->queues
[i
].nvme_sq
);
336 goto out_destroy_queues
;
338 ctrl
->ctrl
.queue_count
++;
344 nvme_loop_destroy_io_queues(ctrl
);
348 static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl
*ctrl
)
352 for (i
= 1; i
< ctrl
->ctrl
.queue_count
; i
++) {
353 ret
= nvmf_connect_io_queue(&ctrl
->ctrl
, i
);
356 set_bit(NVME_LOOP_Q_LIVE
, &ctrl
->queues
[i
].flags
);
362 static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl
*ctrl
)
366 memset(&ctrl
->admin_tag_set
, 0, sizeof(ctrl
->admin_tag_set
));
367 ctrl
->admin_tag_set
.ops
= &nvme_loop_admin_mq_ops
;
368 ctrl
->admin_tag_set
.queue_depth
= NVME_AQ_MQ_TAG_DEPTH
;
369 ctrl
->admin_tag_set
.reserved_tags
= 2; /* connect + keep-alive */
370 ctrl
->admin_tag_set
.numa_node
= NUMA_NO_NODE
;
371 ctrl
->admin_tag_set
.cmd_size
= sizeof(struct nvme_loop_iod
) +
372 SG_CHUNK_SIZE
* sizeof(struct scatterlist
);
373 ctrl
->admin_tag_set
.driver_data
= ctrl
;
374 ctrl
->admin_tag_set
.nr_hw_queues
= 1;
375 ctrl
->admin_tag_set
.timeout
= ADMIN_TIMEOUT
;
376 ctrl
->admin_tag_set
.flags
= BLK_MQ_F_NO_SCHED
;
378 ctrl
->queues
[0].ctrl
= ctrl
;
379 error
= nvmet_sq_init(&ctrl
->queues
[0].nvme_sq
);
382 ctrl
->ctrl
.queue_count
= 1;
384 error
= blk_mq_alloc_tag_set(&ctrl
->admin_tag_set
);
387 ctrl
->ctrl
.admin_tagset
= &ctrl
->admin_tag_set
;
389 ctrl
->ctrl
.admin_q
= blk_mq_init_queue(&ctrl
->admin_tag_set
);
390 if (IS_ERR(ctrl
->ctrl
.admin_q
)) {
391 error
= PTR_ERR(ctrl
->ctrl
.admin_q
);
392 goto out_free_tagset
;
395 error
= nvmf_connect_admin_queue(&ctrl
->ctrl
);
397 goto out_cleanup_queue
;
399 set_bit(NVME_LOOP_Q_LIVE
, &ctrl
->queues
[0].flags
);
401 error
= nvmf_reg_read64(&ctrl
->ctrl
, NVME_REG_CAP
, &ctrl
->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
->ctrl
.cap
), ctrl
->ctrl
.sqsize
);
411 error
= nvme_enable_ctrl(&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
;
425 blk_cleanup_queue(ctrl
->ctrl
.admin_q
);
427 blk_mq_free_tag_set(&ctrl
->admin_tag_set
);
429 nvmet_sq_destroy(&ctrl
->queues
[0].nvme_sq
);
433 static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl
*ctrl
)
435 if (ctrl
->ctrl
.queue_count
> 1) {
436 nvme_stop_queues(&ctrl
->ctrl
);
437 blk_mq_tagset_busy_iter(&ctrl
->tag_set
,
438 nvme_cancel_request
, &ctrl
->ctrl
);
439 nvme_loop_destroy_io_queues(ctrl
);
442 if (ctrl
->ctrl
.state
== NVME_CTRL_LIVE
)
443 nvme_shutdown_ctrl(&ctrl
->ctrl
);
445 blk_mq_quiesce_queue(ctrl
->ctrl
.admin_q
);
446 blk_mq_tagset_busy_iter(&ctrl
->admin_tag_set
,
447 nvme_cancel_request
, &ctrl
->ctrl
);
448 blk_mq_unquiesce_queue(ctrl
->ctrl
.admin_q
);
449 nvme_loop_destroy_admin_queue(ctrl
);
452 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl
*ctrl
)
454 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl
));
457 static void nvme_loop_delete_ctrl(struct nvmet_ctrl
*nctrl
)
459 struct nvme_loop_ctrl
*ctrl
;
461 mutex_lock(&nvme_loop_ctrl_mutex
);
462 list_for_each_entry(ctrl
, &nvme_loop_ctrl_list
, list
) {
463 if (ctrl
->ctrl
.cntlid
== nctrl
->cntlid
)
464 nvme_delete_ctrl(&ctrl
->ctrl
);
466 mutex_unlock(&nvme_loop_ctrl_mutex
);
469 static void nvme_loop_reset_ctrl_work(struct work_struct
*work
)
471 struct nvme_loop_ctrl
*ctrl
=
472 container_of(work
, struct nvme_loop_ctrl
, ctrl
.reset_work
);
476 nvme_stop_ctrl(&ctrl
->ctrl
);
477 nvme_loop_shutdown_ctrl(ctrl
);
479 ret
= nvme_loop_configure_admin_queue(ctrl
);
483 ret
= nvme_loop_init_io_queues(ctrl
);
485 goto out_destroy_admin
;
487 ret
= nvme_loop_connect_io_queues(ctrl
);
491 blk_mq_update_nr_hw_queues(&ctrl
->tag_set
,
492 ctrl
->ctrl
.queue_count
- 1);
494 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
495 WARN_ON_ONCE(!changed
);
497 nvme_start_ctrl(&ctrl
->ctrl
);
502 nvme_loop_destroy_io_queues(ctrl
);
504 nvme_loop_destroy_admin_queue(ctrl
);
506 dev_warn(ctrl
->ctrl
.device
, "Removing after reset failure\n");
507 nvme_uninit_ctrl(&ctrl
->ctrl
);
508 nvme_put_ctrl(&ctrl
->ctrl
);
511 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops
= {
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
,
523 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl
*ctrl
)
527 ret
= nvme_loop_init_io_queues(ctrl
);
531 memset(&ctrl
->tag_set
, 0, sizeof(ctrl
->tag_set
));
532 ctrl
->tag_set
.ops
= &nvme_loop_mq_ops
;
533 ctrl
->tag_set
.queue_depth
= ctrl
->ctrl
.opts
->queue_size
;
534 ctrl
->tag_set
.reserved_tags
= 1; /* fabric connect */
535 ctrl
->tag_set
.numa_node
= NUMA_NO_NODE
;
536 ctrl
->tag_set
.flags
= BLK_MQ_F_SHOULD_MERGE
;
537 ctrl
->tag_set
.cmd_size
= sizeof(struct nvme_loop_iod
) +
538 SG_CHUNK_SIZE
* sizeof(struct scatterlist
);
539 ctrl
->tag_set
.driver_data
= ctrl
;
540 ctrl
->tag_set
.nr_hw_queues
= ctrl
->ctrl
.queue_count
- 1;
541 ctrl
->tag_set
.timeout
= NVME_IO_TIMEOUT
;
542 ctrl
->ctrl
.tagset
= &ctrl
->tag_set
;
544 ret
= blk_mq_alloc_tag_set(&ctrl
->tag_set
);
546 goto out_destroy_queues
;
548 ctrl
->ctrl
.connect_q
= blk_mq_init_queue(&ctrl
->tag_set
);
549 if (IS_ERR(ctrl
->ctrl
.connect_q
)) {
550 ret
= PTR_ERR(ctrl
->ctrl
.connect_q
);
551 goto out_free_tagset
;
554 ret
= nvme_loop_connect_io_queues(ctrl
);
556 goto out_cleanup_connect_q
;
560 out_cleanup_connect_q
:
561 blk_cleanup_queue(ctrl
->ctrl
.connect_q
);
563 blk_mq_free_tag_set(&ctrl
->tag_set
);
565 nvme_loop_destroy_io_queues(ctrl
);
569 static struct nvme_ctrl
*nvme_loop_create_ctrl(struct device
*dev
,
570 struct nvmf_ctrl_options
*opts
)
572 struct nvme_loop_ctrl
*ctrl
;
576 ctrl
= kzalloc(sizeof(*ctrl
), GFP_KERNEL
);
578 return ERR_PTR(-ENOMEM
);
579 ctrl
->ctrl
.opts
= opts
;
580 INIT_LIST_HEAD(&ctrl
->list
);
582 INIT_WORK(&ctrl
->ctrl
.reset_work
, nvme_loop_reset_ctrl_work
);
584 ret
= nvme_init_ctrl(&ctrl
->ctrl
, dev
, &nvme_loop_ctrl_ops
,
585 0 /* no quirks, we're perfect! */);
591 ctrl
->ctrl
.sqsize
= opts
->queue_size
- 1;
592 ctrl
->ctrl
.kato
= opts
->kato
;
594 ctrl
->queues
= kcalloc(opts
->nr_io_queues
+ 1, sizeof(*ctrl
->queues
),
597 goto out_uninit_ctrl
;
599 ret
= nvme_loop_configure_admin_queue(ctrl
);
601 goto out_free_queues
;
603 if (opts
->queue_size
> ctrl
->ctrl
.maxcmd
) {
604 /* warn if maxcmd is lower than queue_size */
605 dev_warn(ctrl
->ctrl
.device
,
606 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
607 opts
->queue_size
, ctrl
->ctrl
.maxcmd
);
608 opts
->queue_size
= ctrl
->ctrl
.maxcmd
;
611 if (opts
->nr_io_queues
) {
612 ret
= nvme_loop_create_io_queues(ctrl
);
614 goto out_remove_admin_queue
;
617 nvme_loop_init_iod(ctrl
, &ctrl
->async_event_iod
, 0);
619 dev_info(ctrl
->ctrl
.device
,
620 "new ctrl: \"%s\"\n", ctrl
->ctrl
.opts
->subsysnqn
);
622 nvme_get_ctrl(&ctrl
->ctrl
);
624 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
625 WARN_ON_ONCE(!changed
);
627 mutex_lock(&nvme_loop_ctrl_mutex
);
628 list_add_tail(&ctrl
->list
, &nvme_loop_ctrl_list
);
629 mutex_unlock(&nvme_loop_ctrl_mutex
);
631 nvme_start_ctrl(&ctrl
->ctrl
);
635 out_remove_admin_queue
:
636 nvme_loop_destroy_admin_queue(ctrl
);
640 nvme_uninit_ctrl(&ctrl
->ctrl
);
642 nvme_put_ctrl(&ctrl
->ctrl
);
648 static int nvme_loop_add_port(struct nvmet_port
*port
)
651 * XXX: disalow adding more than one port so
652 * there is no connection rejections when a
653 * a subsystem is assigned to a port for which
654 * loop doesn't have a pointer.
655 * This scenario would be possible if we allowed
656 * more than one port to be added and a subsystem
657 * was assigned to a port other than nvmet_loop_port.
663 nvmet_loop_port
= port
;
667 static void nvme_loop_remove_port(struct nvmet_port
*port
)
669 if (port
== nvmet_loop_port
)
670 nvmet_loop_port
= NULL
;
673 static struct nvmet_fabrics_ops nvme_loop_ops
= {
674 .owner
= THIS_MODULE
,
675 .type
= NVMF_TRTYPE_LOOP
,
676 .add_port
= nvme_loop_add_port
,
677 .remove_port
= nvme_loop_remove_port
,
678 .queue_response
= nvme_loop_queue_response
,
679 .delete_ctrl
= nvme_loop_delete_ctrl
,
682 static struct nvmf_transport_ops nvme_loop_transport
= {
684 .module
= THIS_MODULE
,
685 .create_ctrl
= nvme_loop_create_ctrl
,
688 static int __init
nvme_loop_init_module(void)
692 ret
= nvmet_register_transport(&nvme_loop_ops
);
696 ret
= nvmf_register_transport(&nvme_loop_transport
);
698 nvmet_unregister_transport(&nvme_loop_ops
);
703 static void __exit
nvme_loop_cleanup_module(void)
705 struct nvme_loop_ctrl
*ctrl
, *next
;
707 nvmf_unregister_transport(&nvme_loop_transport
);
708 nvmet_unregister_transport(&nvme_loop_ops
);
710 mutex_lock(&nvme_loop_ctrl_mutex
);
711 list_for_each_entry_safe(ctrl
, next
, &nvme_loop_ctrl_list
, list
)
712 nvme_delete_ctrl(&ctrl
->ctrl
);
713 mutex_unlock(&nvme_loop_ctrl_mutex
);
715 flush_workqueue(nvme_wq
);
718 module_init(nvme_loop_init_module
);
719 module_exit(nvme_loop_cleanup_module
);
721 MODULE_LICENSE("GPL v2");
722 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */