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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>
20#include "nvmet.h"
21#include "../host/nvme.h"
22#include "../host/fabrics.h"
23
24#define NVME_LOOP_MAX_SEGMENTS 256
25
26
27
28
29
30#define NVME_LOOP_NR_AEN_COMMANDS 1
31#define NVME_LOOP_AQ_BLKMQ_DEPTH \
32 (NVME_AQ_DEPTH - NVME_LOOP_NR_AEN_COMMANDS)
33
34struct nvme_loop_iod {
35 struct nvme_request nvme_req;
36 struct nvme_command cmd;
37 struct nvme_completion rsp;
38 struct nvmet_req req;
39 struct nvme_loop_queue *queue;
40 struct work_struct work;
41 struct sg_table sg_table;
42 struct scatterlist first_sgl[];
43};
44
45struct nvme_loop_ctrl {
46 struct nvme_loop_queue *queues;
47
48 struct blk_mq_tag_set admin_tag_set;
49
50 struct list_head list;
51 struct blk_mq_tag_set tag_set;
52 struct nvme_loop_iod async_event_iod;
53 struct nvme_ctrl ctrl;
54
55 struct nvmet_ctrl *target_ctrl;
56 struct work_struct delete_work;
57};
58
59static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl)
60{
61 return container_of(ctrl, struct nvme_loop_ctrl, ctrl);
62}
63
64struct nvme_loop_queue {
65 struct nvmet_cq nvme_cq;
66 struct nvmet_sq nvme_sq;
67 struct nvme_loop_ctrl *ctrl;
68};
69
70static struct nvmet_port *nvmet_loop_port;
71
72static LIST_HEAD(nvme_loop_ctrl_list);
73static DEFINE_MUTEX(nvme_loop_ctrl_mutex);
74
75static void nvme_loop_queue_response(struct nvmet_req *nvme_req);
76static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl);
77
78static struct nvmet_fabrics_ops nvme_loop_ops;
79
80static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue)
81{
82 return queue - queue->ctrl->queues;
83}
84
85static void nvme_loop_complete_rq(struct request *req)
86{
87 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
88
89 nvme_cleanup_cmd(req);
90 sg_free_table_chained(&iod->sg_table, true);
91 nvme_complete_rq(req);
92}
93
94static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue)
95{
96 u32 queue_idx = nvme_loop_queue_idx(queue);
97
98 if (queue_idx == 0)
99 return queue->ctrl->admin_tag_set.tags[queue_idx];
100 return queue->ctrl->tag_set.tags[queue_idx - 1];
101}
102
103static void nvme_loop_queue_response(struct nvmet_req *req)
104{
105 struct nvme_loop_queue *queue =
106 container_of(req->sq, struct nvme_loop_queue, nvme_sq);
107 struct nvme_completion *cqe = req->rsp;
108
109
110
111
112
113
114
115 if (unlikely(nvme_loop_queue_idx(queue) == 0 &&
116 cqe->command_id >= NVME_LOOP_AQ_BLKMQ_DEPTH)) {
117 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
118 &cqe->result);
119 } else {
120 struct request *rq;
121
122 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id);
123 if (!rq) {
124 dev_err(queue->ctrl->ctrl.device,
125 "tag 0x%x on queue %d not found\n",
126 cqe->command_id, nvme_loop_queue_idx(queue));
127 return;
128 }
129
130 nvme_end_request(rq, cqe->status, cqe->result);
131 }
132}
133
134static void nvme_loop_execute_work(struct work_struct *work)
135{
136 struct nvme_loop_iod *iod =
137 container_of(work, struct nvme_loop_iod, work);
138
139 iod->req.execute(&iod->req);
140}
141
142static enum blk_eh_timer_return
143nvme_loop_timeout(struct request *rq, bool reserved)
144{
145 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq);
146
147
148 nvme_reset_ctrl(&iod->queue->ctrl->ctrl);
149
150
151 nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR;
152
153 return BLK_EH_HANDLED;
154}
155
156static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
157 const struct blk_mq_queue_data *bd)
158{
159 struct nvme_ns *ns = hctx->queue->queuedata;
160 struct nvme_loop_queue *queue = hctx->driver_data;
161 struct request *req = bd->rq;
162 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
163 blk_status_t ret;
164
165 ret = nvme_setup_cmd(ns, req, &iod->cmd);
166 if (ret)
167 return ret;
168
169 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
170 iod->req.port = nvmet_loop_port;
171 if (!nvmet_req_init(&iod->req, &queue->nvme_cq,
172 &queue->nvme_sq, &nvme_loop_ops)) {
173 nvme_cleanup_cmd(req);
174 blk_mq_start_request(req);
175 nvme_loop_queue_response(&iod->req);
176 return BLK_STS_OK;
177 }
178
179 if (blk_rq_bytes(req)) {
180 iod->sg_table.sgl = iod->first_sgl;
181 if (sg_alloc_table_chained(&iod->sg_table,
182 blk_rq_nr_phys_segments(req),
183 iod->sg_table.sgl))
184 return BLK_STS_RESOURCE;
185
186 iod->req.sg = iod->sg_table.sgl;
187 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl);
188 }
189
190 blk_mq_start_request(req);
191
192 schedule_work(&iod->work);
193 return BLK_STS_OK;
194}
195
196static void nvme_loop_submit_async_event(struct nvme_ctrl *arg, int aer_idx)
197{
198 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg);
199 struct nvme_loop_queue *queue = &ctrl->queues[0];
200 struct nvme_loop_iod *iod = &ctrl->async_event_iod;
201
202 memset(&iod->cmd, 0, sizeof(iod->cmd));
203 iod->cmd.common.opcode = nvme_admin_async_event;
204 iod->cmd.common.command_id = NVME_LOOP_AQ_BLKMQ_DEPTH;
205 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
206
207 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq,
208 &nvme_loop_ops)) {
209 dev_err(ctrl->ctrl.device, "failed async event work\n");
210 return;
211 }
212
213 schedule_work(&iod->work);
214}
215
216static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl,
217 struct nvme_loop_iod *iod, unsigned int queue_idx)
218{
219 iod->req.cmd = &iod->cmd;
220 iod->req.rsp = &iod->rsp;
221 iod->queue = &ctrl->queues[queue_idx];
222 INIT_WORK(&iod->work, nvme_loop_execute_work);
223 return 0;
224}
225
226static int nvme_loop_init_request(struct blk_mq_tag_set *set,
227 struct request *req, unsigned int hctx_idx,
228 unsigned int numa_node)
229{
230 struct nvme_loop_ctrl *ctrl = set->driver_data;
231
232 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req),
233 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0);
234}
235
236static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
237 unsigned int hctx_idx)
238{
239 struct nvme_loop_ctrl *ctrl = data;
240 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1];
241
242 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
243
244 hctx->driver_data = queue;
245 return 0;
246}
247
248static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
249 unsigned int hctx_idx)
250{
251 struct nvme_loop_ctrl *ctrl = data;
252 struct nvme_loop_queue *queue = &ctrl->queues[0];
253
254 BUG_ON(hctx_idx != 0);
255
256 hctx->driver_data = queue;
257 return 0;
258}
259
260static const struct blk_mq_ops nvme_loop_mq_ops = {
261 .queue_rq = nvme_loop_queue_rq,
262 .complete = nvme_loop_complete_rq,
263 .init_request = nvme_loop_init_request,
264 .init_hctx = nvme_loop_init_hctx,
265 .timeout = nvme_loop_timeout,
266};
267
268static const struct blk_mq_ops nvme_loop_admin_mq_ops = {
269 .queue_rq = nvme_loop_queue_rq,
270 .complete = nvme_loop_complete_rq,
271 .init_request = nvme_loop_init_request,
272 .init_hctx = nvme_loop_init_admin_hctx,
273 .timeout = nvme_loop_timeout,
274};
275
276static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl)
277{
278 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
279 blk_cleanup_queue(ctrl->ctrl.admin_q);
280 blk_mq_free_tag_set(&ctrl->admin_tag_set);
281}
282
283static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl)
284{
285 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
286
287 if (list_empty(&ctrl->list))
288 goto free_ctrl;
289
290 mutex_lock(&nvme_loop_ctrl_mutex);
291 list_del(&ctrl->list);
292 mutex_unlock(&nvme_loop_ctrl_mutex);
293
294 if (nctrl->tagset) {
295 blk_cleanup_queue(ctrl->ctrl.connect_q);
296 blk_mq_free_tag_set(&ctrl->tag_set);
297 }
298 kfree(ctrl->queues);
299 nvmf_free_options(nctrl->opts);
300free_ctrl:
301 kfree(ctrl);
302}
303
304static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl)
305{
306 int i;
307
308 for (i = 1; i < ctrl->ctrl.queue_count; i++)
309 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
310}
311
312static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl)
313{
314 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
315 unsigned int nr_io_queues;
316 int ret, i;
317
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)
321 return ret;
322
323 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues);
324
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);
328 if (ret)
329 goto out_destroy_queues;
330
331 ctrl->ctrl.queue_count++;
332 }
333
334 return 0;
335
336out_destroy_queues:
337 nvme_loop_destroy_io_queues(ctrl);
338 return ret;
339}
340
341static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl)
342{
343 int i, ret;
344
345 for (i = 1; i < ctrl->ctrl.queue_count; i++) {
346 ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
347 if (ret)
348 return ret;
349 }
350
351 return 0;
352}
353
354static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl)
355{
356 int error;
357
358 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
359 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops;
360 ctrl->admin_tag_set.queue_depth = NVME_LOOP_AQ_BLKMQ_DEPTH;
361 ctrl->admin_tag_set.reserved_tags = 2;
362 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
363 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
364 SG_CHUNK_SIZE * sizeof(struct scatterlist);
365 ctrl->admin_tag_set.driver_data = ctrl;
366 ctrl->admin_tag_set.nr_hw_queues = 1;
367 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
368
369 ctrl->queues[0].ctrl = ctrl;
370 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq);
371 if (error)
372 return error;
373 ctrl->ctrl.queue_count = 1;
374
375 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
376 if (error)
377 goto out_free_sq;
378 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set;
379
380 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
381 if (IS_ERR(ctrl->ctrl.admin_q)) {
382 error = PTR_ERR(ctrl->ctrl.admin_q);
383 goto out_free_tagset;
384 }
385
386 error = nvmf_connect_admin_queue(&ctrl->ctrl);
387 if (error)
388 goto out_cleanup_queue;
389
390 error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap);
391 if (error) {
392 dev_err(ctrl->ctrl.device,
393 "prop_get NVME_REG_CAP failed\n");
394 goto out_cleanup_queue;
395 }
396
397 ctrl->ctrl.sqsize =
398 min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize);
399
400 error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
401 if (error)
402 goto out_cleanup_queue;
403
404 ctrl->ctrl.max_hw_sectors =
405 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9);
406
407 error = nvme_init_identify(&ctrl->ctrl);
408 if (error)
409 goto out_cleanup_queue;
410
411 return 0;
412
413out_cleanup_queue:
414 blk_cleanup_queue(ctrl->ctrl.admin_q);
415out_free_tagset:
416 blk_mq_free_tag_set(&ctrl->admin_tag_set);
417out_free_sq:
418 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
419 return error;
420}
421
422static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl)
423{
424 if (ctrl->ctrl.queue_count > 1) {
425 nvme_stop_queues(&ctrl->ctrl);
426 blk_mq_tagset_busy_iter(&ctrl->tag_set,
427 nvme_cancel_request, &ctrl->ctrl);
428 nvme_loop_destroy_io_queues(ctrl);
429 }
430
431 if (ctrl->ctrl.state == NVME_CTRL_LIVE)
432 nvme_shutdown_ctrl(&ctrl->ctrl);
433
434 blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
435 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
436 nvme_cancel_request, &ctrl->ctrl);
437 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
438 nvme_loop_destroy_admin_queue(ctrl);
439}
440
441static void nvme_loop_del_ctrl_work(struct work_struct *work)
442{
443 struct nvme_loop_ctrl *ctrl = container_of(work,
444 struct nvme_loop_ctrl, delete_work);
445
446 nvme_stop_ctrl(&ctrl->ctrl);
447 nvme_remove_namespaces(&ctrl->ctrl);
448 nvme_loop_shutdown_ctrl(ctrl);
449 nvme_uninit_ctrl(&ctrl->ctrl);
450 nvme_put_ctrl(&ctrl->ctrl);
451}
452
453static int __nvme_loop_del_ctrl(struct nvme_loop_ctrl *ctrl)
454{
455 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
456 return -EBUSY;
457
458 if (!queue_work(nvme_wq, &ctrl->delete_work))
459 return -EBUSY;
460
461 return 0;
462}
463
464static int nvme_loop_del_ctrl(struct nvme_ctrl *nctrl)
465{
466 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
467 int ret;
468
469 ret = __nvme_loop_del_ctrl(ctrl);
470 if (ret)
471 return ret;
472
473 flush_work(&ctrl->delete_work);
474
475 return 0;
476}
477
478static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl)
479{
480 struct nvme_loop_ctrl *ctrl;
481
482 mutex_lock(&nvme_loop_ctrl_mutex);
483 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) {
484 if (ctrl->ctrl.cntlid == nctrl->cntlid)
485 __nvme_loop_del_ctrl(ctrl);
486 }
487 mutex_unlock(&nvme_loop_ctrl_mutex);
488}
489
490static void nvme_loop_reset_ctrl_work(struct work_struct *work)
491{
492 struct nvme_loop_ctrl *ctrl =
493 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work);
494 bool changed;
495 int ret;
496
497 nvme_stop_ctrl(&ctrl->ctrl);
498 nvme_loop_shutdown_ctrl(ctrl);
499
500 ret = nvme_loop_configure_admin_queue(ctrl);
501 if (ret)
502 goto out_disable;
503
504 ret = nvme_loop_init_io_queues(ctrl);
505 if (ret)
506 goto out_destroy_admin;
507
508 ret = nvme_loop_connect_io_queues(ctrl);
509 if (ret)
510 goto out_destroy_io;
511
512 blk_mq_update_nr_hw_queues(&ctrl->tag_set,
513 ctrl->ctrl.queue_count - 1);
514
515 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
516 WARN_ON_ONCE(!changed);
517
518 nvme_start_ctrl(&ctrl->ctrl);
519
520 return;
521
522out_destroy_io:
523 nvme_loop_destroy_io_queues(ctrl);
524out_destroy_admin:
525 nvme_loop_destroy_admin_queue(ctrl);
526out_disable:
527 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
528 nvme_uninit_ctrl(&ctrl->ctrl);
529 nvme_put_ctrl(&ctrl->ctrl);
530}
531
532static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
533 .name = "loop",
534 .module = THIS_MODULE,
535 .flags = NVME_F_FABRICS,
536 .reg_read32 = nvmf_reg_read32,
537 .reg_read64 = nvmf_reg_read64,
538 .reg_write32 = nvmf_reg_write32,
539 .free_ctrl = nvme_loop_free_ctrl,
540 .submit_async_event = nvme_loop_submit_async_event,
541 .delete_ctrl = nvme_loop_del_ctrl,
542};
543
544static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
545{
546 int ret;
547
548 ret = nvme_loop_init_io_queues(ctrl);
549 if (ret)
550 return ret;
551
552 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
553 ctrl->tag_set.ops = &nvme_loop_mq_ops;
554 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
555 ctrl->tag_set.reserved_tags = 1;
556 ctrl->tag_set.numa_node = NUMA_NO_NODE;
557 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
558 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
559 SG_CHUNK_SIZE * sizeof(struct scatterlist);
560 ctrl->tag_set.driver_data = ctrl;
561 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1;
562 ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
563 ctrl->ctrl.tagset = &ctrl->tag_set;
564
565 ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
566 if (ret)
567 goto out_destroy_queues;
568
569 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
570 if (IS_ERR(ctrl->ctrl.connect_q)) {
571 ret = PTR_ERR(ctrl->ctrl.connect_q);
572 goto out_free_tagset;
573 }
574
575 ret = nvme_loop_connect_io_queues(ctrl);
576 if (ret)
577 goto out_cleanup_connect_q;
578
579 return 0;
580
581out_cleanup_connect_q:
582 blk_cleanup_queue(ctrl->ctrl.connect_q);
583out_free_tagset:
584 blk_mq_free_tag_set(&ctrl->tag_set);
585out_destroy_queues:
586 nvme_loop_destroy_io_queues(ctrl);
587 return ret;
588}
589
590static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
591 struct nvmf_ctrl_options *opts)
592{
593 struct nvme_loop_ctrl *ctrl;
594 bool changed;
595 int ret;
596
597 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
598 if (!ctrl)
599 return ERR_PTR(-ENOMEM);
600 ctrl->ctrl.opts = opts;
601 INIT_LIST_HEAD(&ctrl->list);
602
603 INIT_WORK(&ctrl->delete_work, nvme_loop_del_ctrl_work);
604 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work);
605
606 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops,
607 0 );
608 if (ret)
609 goto out_put_ctrl;
610
611 ret = -ENOMEM;
612
613 ctrl->ctrl.sqsize = opts->queue_size - 1;
614 ctrl->ctrl.kato = opts->kato;
615
616 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),
617 GFP_KERNEL);
618 if (!ctrl->queues)
619 goto out_uninit_ctrl;
620
621 ret = nvme_loop_configure_admin_queue(ctrl);
622 if (ret)
623 goto out_free_queues;
624
625 if (opts->queue_size > ctrl->ctrl.maxcmd) {
626
627 dev_warn(ctrl->ctrl.device,
628 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
629 opts->queue_size, ctrl->ctrl.maxcmd);
630 opts->queue_size = ctrl->ctrl.maxcmd;
631 }
632
633 if (opts->nr_io_queues) {
634 ret = nvme_loop_create_io_queues(ctrl);
635 if (ret)
636 goto out_remove_admin_queue;
637 }
638
639 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0);
640
641 dev_info(ctrl->ctrl.device,
642 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
643
644 kref_get(&ctrl->ctrl.kref);
645
646 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
647 WARN_ON_ONCE(!changed);
648
649 mutex_lock(&nvme_loop_ctrl_mutex);
650 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list);
651 mutex_unlock(&nvme_loop_ctrl_mutex);
652
653 nvme_start_ctrl(&ctrl->ctrl);
654
655 return &ctrl->ctrl;
656
657out_remove_admin_queue:
658 nvme_loop_destroy_admin_queue(ctrl);
659out_free_queues:
660 kfree(ctrl->queues);
661out_uninit_ctrl:
662 nvme_uninit_ctrl(&ctrl->ctrl);
663out_put_ctrl:
664 nvme_put_ctrl(&ctrl->ctrl);
665 if (ret > 0)
666 ret = -EIO;
667 return ERR_PTR(ret);
668}
669
670static int nvme_loop_add_port(struct nvmet_port *port)
671{
672
673
674
675
676
677
678
679
680
681
682 if (nvmet_loop_port)
683 return -EPERM;
684
685 nvmet_loop_port = port;
686 return 0;
687}
688
689static void nvme_loop_remove_port(struct nvmet_port *port)
690{
691 if (port == nvmet_loop_port)
692 nvmet_loop_port = NULL;
693}
694
695static struct nvmet_fabrics_ops nvme_loop_ops = {
696 .owner = THIS_MODULE,
697 .type = NVMF_TRTYPE_LOOP,
698 .add_port = nvme_loop_add_port,
699 .remove_port = nvme_loop_remove_port,
700 .queue_response = nvme_loop_queue_response,
701 .delete_ctrl = nvme_loop_delete_ctrl,
702};
703
704static struct nvmf_transport_ops nvme_loop_transport = {
705 .name = "loop",
706 .create_ctrl = nvme_loop_create_ctrl,
707};
708
709static int __init nvme_loop_init_module(void)
710{
711 int ret;
712
713 ret = nvmet_register_transport(&nvme_loop_ops);
714 if (ret)
715 return ret;
716
717 ret = nvmf_register_transport(&nvme_loop_transport);
718 if (ret)
719 nvmet_unregister_transport(&nvme_loop_ops);
720
721 return ret;
722}
723
724static void __exit nvme_loop_cleanup_module(void)
725{
726 struct nvme_loop_ctrl *ctrl, *next;
727
728 nvmf_unregister_transport(&nvme_loop_transport);
729 nvmet_unregister_transport(&nvme_loop_ops);
730
731 mutex_lock(&nvme_loop_ctrl_mutex);
732 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list)
733 __nvme_loop_del_ctrl(ctrl);
734 mutex_unlock(&nvme_loop_ctrl_mutex);
735
736 flush_workqueue(nvme_wq);
737}
738
739module_init(nvme_loop_init_module);
740module_exit(nvme_loop_cleanup_module);
741
742MODULE_LICENSE("GPL v2");
743MODULE_ALIAS("nvmet-transport-254");
744