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5
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7#include <linux/scatterlist.h>
8#include <linux/blk-mq.h>
9#include <linux/nvme.h>
10#include <linux/module.h>
11#include <linux/parser.h>
12#include "nvmet.h"
13#include "../host/nvme.h"
14#include "../host/fabrics.h"
15
16#define NVME_LOOP_MAX_SEGMENTS 256
17
18struct nvme_loop_iod {
19 struct nvme_request nvme_req;
20 struct nvme_command cmd;
21 struct nvme_completion cqe;
22 struct nvmet_req req;
23 struct nvme_loop_queue *queue;
24 struct work_struct work;
25 struct sg_table sg_table;
26 struct scatterlist first_sgl[];
27};
28
29struct nvme_loop_ctrl {
30 struct nvme_loop_queue *queues;
31
32 struct blk_mq_tag_set admin_tag_set;
33
34 struct list_head list;
35 struct blk_mq_tag_set tag_set;
36 struct nvme_loop_iod async_event_iod;
37 struct nvme_ctrl ctrl;
38
39 struct nvmet_port *port;
40};
41
42static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl)
43{
44 return container_of(ctrl, struct nvme_loop_ctrl, ctrl);
45}
46
47enum nvme_loop_queue_flags {
48 NVME_LOOP_Q_LIVE = 0,
49};
50
51struct nvme_loop_queue {
52 struct nvmet_cq nvme_cq;
53 struct nvmet_sq nvme_sq;
54 struct nvme_loop_ctrl *ctrl;
55 unsigned long flags;
56};
57
58static LIST_HEAD(nvme_loop_ports);
59static DEFINE_MUTEX(nvme_loop_ports_mutex);
60
61static LIST_HEAD(nvme_loop_ctrl_list);
62static DEFINE_MUTEX(nvme_loop_ctrl_mutex);
63
64static void nvme_loop_queue_response(struct nvmet_req *nvme_req);
65static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl);
66
67static const struct nvmet_fabrics_ops nvme_loop_ops;
68
69static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue)
70{
71 return queue - queue->ctrl->queues;
72}
73
74static void nvme_loop_complete_rq(struct request *req)
75{
76 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
77
78 sg_free_table_chained(&iod->sg_table, NVME_INLINE_SG_CNT);
79 nvme_complete_rq(req);
80}
81
82static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue)
83{
84 u32 queue_idx = nvme_loop_queue_idx(queue);
85
86 if (queue_idx == 0)
87 return queue->ctrl->admin_tag_set.tags[queue_idx];
88 return queue->ctrl->tag_set.tags[queue_idx - 1];
89}
90
91static void nvme_loop_queue_response(struct nvmet_req *req)
92{
93 struct nvme_loop_queue *queue =
94 container_of(req->sq, struct nvme_loop_queue, nvme_sq);
95 struct nvme_completion *cqe = req->cqe;
96
97
98
99
100
101
102
103 if (unlikely(nvme_is_aen_req(nvme_loop_queue_idx(queue),
104 cqe->command_id))) {
105 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
106 &cqe->result);
107 } else {
108 struct request *rq;
109
110 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id);
111 if (!rq) {
112 dev_err(queue->ctrl->ctrl.device,
113 "tag 0x%x on queue %d not found\n",
114 cqe->command_id, nvme_loop_queue_idx(queue));
115 return;
116 }
117
118 if (!nvme_try_complete_req(rq, cqe->status, cqe->result))
119 nvme_loop_complete_rq(rq);
120 }
121}
122
123static void nvme_loop_execute_work(struct work_struct *work)
124{
125 struct nvme_loop_iod *iod =
126 container_of(work, struct nvme_loop_iod, work);
127
128 iod->req.execute(&iod->req);
129}
130
131static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
132 const struct blk_mq_queue_data *bd)
133{
134 struct nvme_ns *ns = hctx->queue->queuedata;
135 struct nvme_loop_queue *queue = hctx->driver_data;
136 struct request *req = bd->rq;
137 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
138 bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags);
139 blk_status_t ret;
140
141 if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready))
142 return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req);
143
144 ret = nvme_setup_cmd(ns, req, &iod->cmd);
145 if (ret)
146 return ret;
147
148 blk_mq_start_request(req);
149 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
150 iod->req.port = queue->ctrl->port;
151 if (!nvmet_req_init(&iod->req, &queue->nvme_cq,
152 &queue->nvme_sq, &nvme_loop_ops))
153 return BLK_STS_OK;
154
155 if (blk_rq_nr_phys_segments(req)) {
156 iod->sg_table.sgl = iod->first_sgl;
157 if (sg_alloc_table_chained(&iod->sg_table,
158 blk_rq_nr_phys_segments(req),
159 iod->sg_table.sgl, NVME_INLINE_SG_CNT)) {
160 nvme_cleanup_cmd(req);
161 return BLK_STS_RESOURCE;
162 }
163
164 iod->req.sg = iod->sg_table.sgl;
165 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl);
166 iod->req.transfer_len = blk_rq_payload_bytes(req);
167 }
168
169 schedule_work(&iod->work);
170 return BLK_STS_OK;
171}
172
173static void nvme_loop_submit_async_event(struct nvme_ctrl *arg)
174{
175 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg);
176 struct nvme_loop_queue *queue = &ctrl->queues[0];
177 struct nvme_loop_iod *iod = &ctrl->async_event_iod;
178
179 memset(&iod->cmd, 0, sizeof(iod->cmd));
180 iod->cmd.common.opcode = nvme_admin_async_event;
181 iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH;
182 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
183
184 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq,
185 &nvme_loop_ops)) {
186 dev_err(ctrl->ctrl.device, "failed async event work\n");
187 return;
188 }
189
190 schedule_work(&iod->work);
191}
192
193static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl,
194 struct nvme_loop_iod *iod, unsigned int queue_idx)
195{
196 iod->req.cmd = &iod->cmd;
197 iod->req.cqe = &iod->cqe;
198 iod->queue = &ctrl->queues[queue_idx];
199 INIT_WORK(&iod->work, nvme_loop_execute_work);
200 return 0;
201}
202
203static int nvme_loop_init_request(struct blk_mq_tag_set *set,
204 struct request *req, unsigned int hctx_idx,
205 unsigned int numa_node)
206{
207 struct nvme_loop_ctrl *ctrl = set->driver_data;
208
209 nvme_req(req)->ctrl = &ctrl->ctrl;
210 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req),
211 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0);
212}
213
214static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
215 unsigned int hctx_idx)
216{
217 struct nvme_loop_ctrl *ctrl = data;
218 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1];
219
220 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
221
222 hctx->driver_data = queue;
223 return 0;
224}
225
226static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
227 unsigned int hctx_idx)
228{
229 struct nvme_loop_ctrl *ctrl = data;
230 struct nvme_loop_queue *queue = &ctrl->queues[0];
231
232 BUG_ON(hctx_idx != 0);
233
234 hctx->driver_data = queue;
235 return 0;
236}
237
238static const struct blk_mq_ops nvme_loop_mq_ops = {
239 .queue_rq = nvme_loop_queue_rq,
240 .complete = nvme_loop_complete_rq,
241 .init_request = nvme_loop_init_request,
242 .init_hctx = nvme_loop_init_hctx,
243};
244
245static const struct blk_mq_ops nvme_loop_admin_mq_ops = {
246 .queue_rq = nvme_loop_queue_rq,
247 .complete = nvme_loop_complete_rq,
248 .init_request = nvme_loop_init_request,
249 .init_hctx = nvme_loop_init_admin_hctx,
250};
251
252static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl)
253{
254 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags);
255 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
256 blk_cleanup_queue(ctrl->ctrl.admin_q);
257 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
258 blk_mq_free_tag_set(&ctrl->admin_tag_set);
259}
260
261static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl)
262{
263 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
264
265 if (list_empty(&ctrl->list))
266 goto free_ctrl;
267
268 mutex_lock(&nvme_loop_ctrl_mutex);
269 list_del(&ctrl->list);
270 mutex_unlock(&nvme_loop_ctrl_mutex);
271
272 if (nctrl->tagset) {
273 blk_cleanup_queue(ctrl->ctrl.connect_q);
274 blk_mq_free_tag_set(&ctrl->tag_set);
275 }
276 kfree(ctrl->queues);
277 nvmf_free_options(nctrl->opts);
278free_ctrl:
279 kfree(ctrl);
280}
281
282static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl)
283{
284 int i;
285
286 for (i = 1; i < ctrl->ctrl.queue_count; i++) {
287 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags);
288 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
289 }
290}
291
292static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl)
293{
294 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
295 unsigned int nr_io_queues;
296 int ret, i;
297
298 nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
299 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
300 if (ret || !nr_io_queues)
301 return ret;
302
303 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues);
304
305 for (i = 1; i <= nr_io_queues; i++) {
306 ctrl->queues[i].ctrl = ctrl;
307 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq);
308 if (ret)
309 goto out_destroy_queues;
310
311 ctrl->ctrl.queue_count++;
312 }
313
314 return 0;
315
316out_destroy_queues:
317 nvme_loop_destroy_io_queues(ctrl);
318 return ret;
319}
320
321static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl)
322{
323 int i, ret;
324
325 for (i = 1; i < ctrl->ctrl.queue_count; i++) {
326 ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false);
327 if (ret)
328 return ret;
329 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags);
330 }
331
332 return 0;
333}
334
335static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl)
336{
337 int error;
338
339 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
340 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops;
341 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH;
342 ctrl->admin_tag_set.reserved_tags = 2;
343 ctrl->admin_tag_set.numa_node = ctrl->ctrl.numa_node;
344 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
345 NVME_INLINE_SG_CNT * sizeof(struct scatterlist);
346 ctrl->admin_tag_set.driver_data = ctrl;
347 ctrl->admin_tag_set.nr_hw_queues = 1;
348 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
349 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED;
350
351 ctrl->queues[0].ctrl = ctrl;
352 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq);
353 if (error)
354 return error;
355 ctrl->ctrl.queue_count = 1;
356
357 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
358 if (error)
359 goto out_free_sq;
360 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set;
361
362 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set);
363 if (IS_ERR(ctrl->ctrl.fabrics_q)) {
364 error = PTR_ERR(ctrl->ctrl.fabrics_q);
365 goto out_free_tagset;
366 }
367
368 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
369 if (IS_ERR(ctrl->ctrl.admin_q)) {
370 error = PTR_ERR(ctrl->ctrl.admin_q);
371 goto out_cleanup_fabrics_q;
372 }
373
374 error = nvmf_connect_admin_queue(&ctrl->ctrl);
375 if (error)
376 goto out_cleanup_queue;
377
378 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags);
379
380 error = nvme_enable_ctrl(&ctrl->ctrl);
381 if (error)
382 goto out_cleanup_queue;
383
384 ctrl->ctrl.max_hw_sectors =
385 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9);
386
387 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
388
389 error = nvme_init_identify(&ctrl->ctrl);
390 if (error)
391 goto out_cleanup_queue;
392
393 return 0;
394
395out_cleanup_queue:
396 blk_cleanup_queue(ctrl->ctrl.admin_q);
397out_cleanup_fabrics_q:
398 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
399out_free_tagset:
400 blk_mq_free_tag_set(&ctrl->admin_tag_set);
401out_free_sq:
402 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
403 return error;
404}
405
406static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl)
407{
408 if (ctrl->ctrl.queue_count > 1) {
409 nvme_stop_queues(&ctrl->ctrl);
410 blk_mq_tagset_busy_iter(&ctrl->tag_set,
411 nvme_cancel_request, &ctrl->ctrl);
412 blk_mq_tagset_wait_completed_request(&ctrl->tag_set);
413 nvme_loop_destroy_io_queues(ctrl);
414 }
415
416 blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
417 if (ctrl->ctrl.state == NVME_CTRL_LIVE)
418 nvme_shutdown_ctrl(&ctrl->ctrl);
419
420 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
421 nvme_cancel_request, &ctrl->ctrl);
422 blk_mq_tagset_wait_completed_request(&ctrl->admin_tag_set);
423 nvme_loop_destroy_admin_queue(ctrl);
424}
425
426static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl)
427{
428 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl));
429}
430
431static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl)
432{
433 struct nvme_loop_ctrl *ctrl;
434
435 mutex_lock(&nvme_loop_ctrl_mutex);
436 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) {
437 if (ctrl->ctrl.cntlid == nctrl->cntlid)
438 nvme_delete_ctrl(&ctrl->ctrl);
439 }
440 mutex_unlock(&nvme_loop_ctrl_mutex);
441}
442
443static void nvme_loop_reset_ctrl_work(struct work_struct *work)
444{
445 struct nvme_loop_ctrl *ctrl =
446 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work);
447 int ret;
448
449 nvme_stop_ctrl(&ctrl->ctrl);
450 nvme_loop_shutdown_ctrl(ctrl);
451
452 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
453
454 WARN_ON_ONCE(1);
455 return;
456 }
457
458 ret = nvme_loop_configure_admin_queue(ctrl);
459 if (ret)
460 goto out_disable;
461
462 ret = nvme_loop_init_io_queues(ctrl);
463 if (ret)
464 goto out_destroy_admin;
465
466 ret = nvme_loop_connect_io_queues(ctrl);
467 if (ret)
468 goto out_destroy_io;
469
470 blk_mq_update_nr_hw_queues(&ctrl->tag_set,
471 ctrl->ctrl.queue_count - 1);
472
473 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE))
474 WARN_ON_ONCE(1);
475
476 nvme_start_ctrl(&ctrl->ctrl);
477
478 return;
479
480out_destroy_io:
481 nvme_loop_destroy_io_queues(ctrl);
482out_destroy_admin:
483 nvme_loop_destroy_admin_queue(ctrl);
484out_disable:
485 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
486 nvme_uninit_ctrl(&ctrl->ctrl);
487}
488
489static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
490 .name = "loop",
491 .module = THIS_MODULE,
492 .flags = NVME_F_FABRICS,
493 .reg_read32 = nvmf_reg_read32,
494 .reg_read64 = nvmf_reg_read64,
495 .reg_write32 = nvmf_reg_write32,
496 .free_ctrl = nvme_loop_free_ctrl,
497 .submit_async_event = nvme_loop_submit_async_event,
498 .delete_ctrl = nvme_loop_delete_ctrl_host,
499 .get_address = nvmf_get_address,
500};
501
502static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
503{
504 int ret;
505
506 ret = nvme_loop_init_io_queues(ctrl);
507 if (ret)
508 return ret;
509
510 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
511 ctrl->tag_set.ops = &nvme_loop_mq_ops;
512 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
513 ctrl->tag_set.reserved_tags = 1;
514 ctrl->tag_set.numa_node = ctrl->ctrl.numa_node;
515 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
516 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
517 NVME_INLINE_SG_CNT * sizeof(struct scatterlist);
518 ctrl->tag_set.driver_data = ctrl;
519 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1;
520 ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
521 ctrl->ctrl.tagset = &ctrl->tag_set;
522
523 ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
524 if (ret)
525 goto out_destroy_queues;
526
527 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
528 if (IS_ERR(ctrl->ctrl.connect_q)) {
529 ret = PTR_ERR(ctrl->ctrl.connect_q);
530 goto out_free_tagset;
531 }
532
533 ret = nvme_loop_connect_io_queues(ctrl);
534 if (ret)
535 goto out_cleanup_connect_q;
536
537 return 0;
538
539out_cleanup_connect_q:
540 blk_cleanup_queue(ctrl->ctrl.connect_q);
541out_free_tagset:
542 blk_mq_free_tag_set(&ctrl->tag_set);
543out_destroy_queues:
544 nvme_loop_destroy_io_queues(ctrl);
545 return ret;
546}
547
548static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl)
549{
550 struct nvmet_port *p, *found = NULL;
551
552 mutex_lock(&nvme_loop_ports_mutex);
553 list_for_each_entry(p, &nvme_loop_ports, entry) {
554
555 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) &&
556 strcmp(ctrl->opts->traddr, p->disc_addr.traddr))
557 continue;
558 found = p;
559 break;
560 }
561 mutex_unlock(&nvme_loop_ports_mutex);
562 return found;
563}
564
565static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
566 struct nvmf_ctrl_options *opts)
567{
568 struct nvme_loop_ctrl *ctrl;
569 int ret;
570
571 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
572 if (!ctrl)
573 return ERR_PTR(-ENOMEM);
574 ctrl->ctrl.opts = opts;
575 INIT_LIST_HEAD(&ctrl->list);
576
577 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work);
578
579 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops,
580 0 );
581 if (ret)
582 goto out_put_ctrl;
583
584 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING))
585 WARN_ON_ONCE(1);
586
587 ret = -ENOMEM;
588
589 ctrl->ctrl.sqsize = opts->queue_size - 1;
590 ctrl->ctrl.kato = opts->kato;
591 ctrl->port = nvme_loop_find_port(&ctrl->ctrl);
592
593 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),
594 GFP_KERNEL);
595 if (!ctrl->queues)
596 goto out_uninit_ctrl;
597
598 ret = nvme_loop_configure_admin_queue(ctrl);
599 if (ret)
600 goto out_free_queues;
601
602 if (opts->queue_size > ctrl->ctrl.maxcmd) {
603
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;
608 }
609
610 if (opts->nr_io_queues) {
611 ret = nvme_loop_create_io_queues(ctrl);
612 if (ret)
613 goto out_remove_admin_queue;
614 }
615
616 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0);
617
618 dev_info(ctrl->ctrl.device,
619 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
620
621 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE))
622 WARN_ON_ONCE(1);
623
624 mutex_lock(&nvme_loop_ctrl_mutex);
625 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list);
626 mutex_unlock(&nvme_loop_ctrl_mutex);
627
628 nvme_start_ctrl(&ctrl->ctrl);
629
630 return &ctrl->ctrl;
631
632out_remove_admin_queue:
633 nvme_loop_destroy_admin_queue(ctrl);
634out_free_queues:
635 kfree(ctrl->queues);
636out_uninit_ctrl:
637 nvme_uninit_ctrl(&ctrl->ctrl);
638out_put_ctrl:
639 nvme_put_ctrl(&ctrl->ctrl);
640 if (ret > 0)
641 ret = -EIO;
642 return ERR_PTR(ret);
643}
644
645static int nvme_loop_add_port(struct nvmet_port *port)
646{
647 mutex_lock(&nvme_loop_ports_mutex);
648 list_add_tail(&port->entry, &nvme_loop_ports);
649 mutex_unlock(&nvme_loop_ports_mutex);
650 return 0;
651}
652
653static void nvme_loop_remove_port(struct nvmet_port *port)
654{
655 mutex_lock(&nvme_loop_ports_mutex);
656 list_del_init(&port->entry);
657 mutex_unlock(&nvme_loop_ports_mutex);
658
659
660
661
662
663
664
665 flush_workqueue(nvme_delete_wq);
666}
667
668static const struct nvmet_fabrics_ops nvme_loop_ops = {
669 .owner = THIS_MODULE,
670 .type = NVMF_TRTYPE_LOOP,
671 .add_port = nvme_loop_add_port,
672 .remove_port = nvme_loop_remove_port,
673 .queue_response = nvme_loop_queue_response,
674 .delete_ctrl = nvme_loop_delete_ctrl,
675};
676
677static struct nvmf_transport_ops nvme_loop_transport = {
678 .name = "loop",
679 .module = THIS_MODULE,
680 .create_ctrl = nvme_loop_create_ctrl,
681 .allowed_opts = NVMF_OPT_TRADDR,
682};
683
684static int __init nvme_loop_init_module(void)
685{
686 int ret;
687
688 ret = nvmet_register_transport(&nvme_loop_ops);
689 if (ret)
690 return ret;
691
692 ret = nvmf_register_transport(&nvme_loop_transport);
693 if (ret)
694 nvmet_unregister_transport(&nvme_loop_ops);
695
696 return ret;
697}
698
699static void __exit nvme_loop_cleanup_module(void)
700{
701 struct nvme_loop_ctrl *ctrl, *next;
702
703 nvmf_unregister_transport(&nvme_loop_transport);
704 nvmet_unregister_transport(&nvme_loop_ops);
705
706 mutex_lock(&nvme_loop_ctrl_mutex);
707 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list)
708 nvme_delete_ctrl(&ctrl->ctrl);
709 mutex_unlock(&nvme_loop_ctrl_mutex);
710
711 flush_workqueue(nvme_delete_wq);
712}
713
714module_init(nvme_loop_init_module);
715module_exit(nvme_loop_cleanup_module);
716
717MODULE_LICENSE("GPL v2");
718MODULE_ALIAS("nvmet-transport-254");
719
