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 */