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dm writecache: add cond_resched to loop in persistent_memory_claim()
[linux/fpc-iii.git] / drivers / nvme / target / loop.c
blob0d54e730cbf2a72e9783112779817351ecd40063
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NVMe over Fabrics loopback device.
4 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
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
18 struct 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
29 struct 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_ctrl *target_ctrl;
40 struct nvmet_port *port;
41 };
42
43 static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl)
44 {
45 return container_of(ctrl, struct nvme_loop_ctrl, ctrl);
46 }
47
48 enum nvme_loop_queue_flags {
49 NVME_LOOP_Q_LIVE = 0,
50 };
51
52 struct nvme_loop_queue {
53 struct nvmet_cq nvme_cq;
54 struct nvmet_sq nvme_sq;
55 struct nvme_loop_ctrl *ctrl;
56 unsigned long flags;
57 };
58
59 static LIST_HEAD(nvme_loop_ports);
60 static DEFINE_MUTEX(nvme_loop_ports_mutex);
61
62 static LIST_HEAD(nvme_loop_ctrl_list);
63 static DEFINE_MUTEX(nvme_loop_ctrl_mutex);
64
65 static void nvme_loop_queue_response(struct nvmet_req *nvme_req);
66 static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl);
67
68 static const struct nvmet_fabrics_ops nvme_loop_ops;
69
70 static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue)
71 {
72 return queue - queue->ctrl->queues;
73 }
74
75 static void nvme_loop_complete_rq(struct request *req)
76 {
77 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
78
79 sg_free_table_chained(&iod->sg_table, NVME_INLINE_SG_CNT);
80 nvme_complete_rq(req);
81 }
82
83 static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue)
84 {
85 u32 queue_idx = nvme_loop_queue_idx(queue);
86
87 if (queue_idx == 0)
88 return queue->ctrl->admin_tag_set.tags[queue_idx];
89 return queue->ctrl->tag_set.tags[queue_idx - 1];
90 }
91
92 static void nvme_loop_queue_response(struct nvmet_req *req)
93 {
94 struct nvme_loop_queue *queue =
95 container_of(req->sq, struct nvme_loop_queue, nvme_sq);
96 struct nvme_completion *cqe = req->cqe;
97
98 /*
99 * AEN requests are special as they don't time out and can
100 * survive any kind of queue freeze and often don't respond to
101 * aborts. We don't even bother to allocate a struct request
102 * for them but rather special case them here.
103 */
104 if (unlikely(nvme_is_aen_req(nvme_loop_queue_idx(queue),
105 cqe->command_id))) {
106 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
107 &cqe->result);
108 } else {
109 struct request *rq;
110
111 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id);
112 if (!rq) {
113 dev_err(queue->ctrl->ctrl.device,
114 "tag 0x%x on queue %d not found\n",
115 cqe->command_id, nvme_loop_queue_idx(queue));
116 return;
117 }
118
119 nvme_end_request(rq, cqe->status, cqe->result);
120 }
121 }
122
123 static 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
131 static 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
173 static 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
193 static 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
203 static 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
214 static 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
226 static 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
238 static 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
245 static 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
252 static 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
261 static 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);
278 free_ctrl:
279 kfree(ctrl);
280 }
281
282 static 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
292 static 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
316 out_destroy_queues:
317 nvme_loop_destroy_io_queues(ctrl);
318 return ret;
319 }
320
321 static 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
335 static 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; /* connect + keep-alive */
343 ctrl->admin_tag_set.numa_node = NUMA_NO_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
395 out_cleanup_queue:
396 blk_cleanup_queue(ctrl->ctrl.admin_q);
397 out_cleanup_fabrics_q:
398 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
399 out_free_tagset:
400 blk_mq_free_tag_set(&ctrl->admin_tag_set);
401 out_free_sq:
402 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
403 return error;
404 }
405
406 static 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
426 static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl)
427 {
428 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl));
429 }
430
431 static 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
443 static 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 bool changed;
448 int ret;
449
450 nvme_stop_ctrl(&ctrl->ctrl);
451 nvme_loop_shutdown_ctrl(ctrl);
452
453 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
454 /* state change failure should never happen */
455 WARN_ON_ONCE(1);
456 return;
457 }
458
459 ret = nvme_loop_configure_admin_queue(ctrl);
460 if (ret)
461 goto out_disable;
462
463 ret = nvme_loop_init_io_queues(ctrl);
464 if (ret)
465 goto out_destroy_admin;
466
467 ret = nvme_loop_connect_io_queues(ctrl);
468 if (ret)
469 goto out_destroy_io;
470
471 blk_mq_update_nr_hw_queues(&ctrl->tag_set,
472 ctrl->ctrl.queue_count - 1);
473
474 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
475 WARN_ON_ONCE(!changed);
476
477 nvme_start_ctrl(&ctrl->ctrl);
478
479 return;
480
481 out_destroy_io:
482 nvme_loop_destroy_io_queues(ctrl);
483 out_destroy_admin:
484 nvme_loop_destroy_admin_queue(ctrl);
485 out_disable:
486 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
487 nvme_uninit_ctrl(&ctrl->ctrl);
488 }
489
490 static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
491 .name = "loop",
492 .module = THIS_MODULE,
493 .flags = NVME_F_FABRICS,
494 .reg_read32 = nvmf_reg_read32,
495 .reg_read64 = nvmf_reg_read64,
496 .reg_write32 = nvmf_reg_write32,
497 .free_ctrl = nvme_loop_free_ctrl,
498 .submit_async_event = nvme_loop_submit_async_event,
499 .delete_ctrl = nvme_loop_delete_ctrl_host,
500 .get_address = nvmf_get_address,
501 };
502
503 static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
504 {
505 int ret;
506
507 ret = nvme_loop_init_io_queues(ctrl);
508 if (ret)
509 return ret;
510
511 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
512 ctrl->tag_set.ops = &nvme_loop_mq_ops;
513 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
514 ctrl->tag_set.reserved_tags = 1; /* fabric connect */
515 ctrl->tag_set.numa_node = NUMA_NO_NODE;
516 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
517 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
518 NVME_INLINE_SG_CNT * sizeof(struct scatterlist);
519 ctrl->tag_set.driver_data = ctrl;
520 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1;
521 ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
522 ctrl->ctrl.tagset = &ctrl->tag_set;
523
524 ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
525 if (ret)
526 goto out_destroy_queues;
527
528 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
529 if (IS_ERR(ctrl->ctrl.connect_q)) {
530 ret = PTR_ERR(ctrl->ctrl.connect_q);
531 goto out_free_tagset;
532 }
533
534 ret = nvme_loop_connect_io_queues(ctrl);
535 if (ret)
536 goto out_cleanup_connect_q;
537
538 return 0;
539
540 out_cleanup_connect_q:
541 blk_cleanup_queue(ctrl->ctrl.connect_q);
542 out_free_tagset:
543 blk_mq_free_tag_set(&ctrl->tag_set);
544 out_destroy_queues:
545 nvme_loop_destroy_io_queues(ctrl);
546 return ret;
547 }
548
549 static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl)
550 {
551 struct nvmet_port *p, *found = NULL;
552
553 mutex_lock(&nvme_loop_ports_mutex);
554 list_for_each_entry(p, &nvme_loop_ports, entry) {
555 /* if no transport address is specified use the first port */
556 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) &&
557 strcmp(ctrl->opts->traddr, p->disc_addr.traddr))
558 continue;
559 found = p;
560 break;
561 }
562 mutex_unlock(&nvme_loop_ports_mutex);
563 return found;
564 }
565
566 static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
567 struct nvmf_ctrl_options *opts)
568 {
569 struct nvme_loop_ctrl *ctrl;
570 bool changed;
571 int ret;
572
573 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
574 if (!ctrl)
575 return ERR_PTR(-ENOMEM);
576 ctrl->ctrl.opts = opts;
577 INIT_LIST_HEAD(&ctrl->list);
578
579 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work);
580
581 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops,
582 0 /* no quirks, we're perfect! */);
583 if (ret)
584 goto out_put_ctrl;
585
586 ret = -ENOMEM;
587
588 ctrl->ctrl.sqsize = opts->queue_size - 1;
589 ctrl->ctrl.kato = opts->kato;
590 ctrl->port = nvme_loop_find_port(&ctrl->ctrl);
591
592 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),
593 GFP_KERNEL);
594 if (!ctrl->queues)
595 goto out_uninit_ctrl;
596
597 ret = nvme_loop_configure_admin_queue(ctrl);
598 if (ret)
599 goto out_free_queues;
600
601 if (opts->queue_size > ctrl->ctrl.maxcmd) {
602 /* warn if maxcmd is lower than queue_size */
603 dev_warn(ctrl->ctrl.device,
604 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
605 opts->queue_size, ctrl->ctrl.maxcmd);
606 opts->queue_size = ctrl->ctrl.maxcmd;
607 }
608
609 if (opts->nr_io_queues) {
610 ret = nvme_loop_create_io_queues(ctrl);
611 if (ret)
612 goto out_remove_admin_queue;
613 }
614
615 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0);
616
617 dev_info(ctrl->ctrl.device,
618 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
619
620 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
621 WARN_ON_ONCE(!changed);
622
623 mutex_lock(&nvme_loop_ctrl_mutex);
624 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list);
625 mutex_unlock(&nvme_loop_ctrl_mutex);
626
627 nvme_start_ctrl(&ctrl->ctrl);
628
629 return &ctrl->ctrl;
630
631 out_remove_admin_queue:
632 nvme_loop_destroy_admin_queue(ctrl);
633 out_free_queues:
634 kfree(ctrl->queues);
635 out_uninit_ctrl:
636 nvme_uninit_ctrl(&ctrl->ctrl);
637 out_put_ctrl:
638 nvme_put_ctrl(&ctrl->ctrl);
639 if (ret > 0)
640 ret = -EIO;
641 return ERR_PTR(ret);
642 }
643
644 static int nvme_loop_add_port(struct nvmet_port *port)
645 {
646 mutex_lock(&nvme_loop_ports_mutex);
647 list_add_tail(&port->entry, &nvme_loop_ports);
648 mutex_unlock(&nvme_loop_ports_mutex);
649 return 0;
650 }
651
652 static void nvme_loop_remove_port(struct nvmet_port *port)
653 {
654 mutex_lock(&nvme_loop_ports_mutex);
655 list_del_init(&port->entry);
656 mutex_unlock(&nvme_loop_ports_mutex);
657
658 /*
659 * Ensure any ctrls that are in the process of being
660 * deleted are in fact deleted before we return
661 * and free the port. This is to prevent active
662 * ctrls from using a port after it's freed.
663 */
664 flush_workqueue(nvme_delete_wq);
665 }
666
667 static const struct nvmet_fabrics_ops nvme_loop_ops = {
668 .owner = THIS_MODULE,
669 .type = NVMF_TRTYPE_LOOP,
670 .add_port = nvme_loop_add_port,
671 .remove_port = nvme_loop_remove_port,
672 .queue_response = nvme_loop_queue_response,
673 .delete_ctrl = nvme_loop_delete_ctrl,
674 };
675
676 static struct nvmf_transport_ops nvme_loop_transport = {
677 .name = "loop",
678 .module = THIS_MODULE,
679 .create_ctrl = nvme_loop_create_ctrl,
680 .allowed_opts = NVMF_OPT_TRADDR,
681 };
682
683 static int __init nvme_loop_init_module(void)
684 {
685 int ret;
686
687 ret = nvmet_register_transport(&nvme_loop_ops);
688 if (ret)
689 return ret;
690
691 ret = nvmf_register_transport(&nvme_loop_transport);
692 if (ret)
693 nvmet_unregister_transport(&nvme_loop_ops);
694
695 return ret;
696 }
697
698 static void __exit nvme_loop_cleanup_module(void)
699 {
700 struct nvme_loop_ctrl *ctrl, *next;
701
702 nvmf_unregister_transport(&nvme_loop_transport);
703 nvmet_unregister_transport(&nvme_loop_ops);
704
705 mutex_lock(&nvme_loop_ctrl_mutex);
706 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list)
707 nvme_delete_ctrl(&ctrl->ctrl);
708 mutex_unlock(&nvme_loop_ctrl_mutex);
709
710 flush_workqueue(nvme_delete_wq);
711 }
712
713 module_init(nvme_loop_init_module);
714 module_exit(nvme_loop_cleanup_module);
715
716 MODULE_LICENSE("GPL v2");
717 MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */
Linux with added FPC-III support