blob: f657a12bf1fef32922b242ce9fe5bb69b558f7b4 [file] [log] [blame]
David Brazdil0f672f62019-12-10 10:32:29 +00001// SPDX-License-Identifier: GPL-2.0
Andrew Scullb4b6d4a2019-01-02 15:54:55 +00002/*
3 * NVMe over Fabrics loopback device.
4 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
Andrew Scullb4b6d4a2019-01-02 15:54:55 +00005 */
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;
David Brazdil0f672f62019-12-10 10:32:29 +000021 struct nvme_completion cqe;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000022 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_ctrl *target_ctrl;
40 struct nvmet_port *port;
41};
42
43static 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
48enum nvme_loop_queue_flags {
49 NVME_LOOP_Q_LIVE = 0,
50};
51
52struct 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
59static LIST_HEAD(nvme_loop_ports);
60static DEFINE_MUTEX(nvme_loop_ports_mutex);
61
62static LIST_HEAD(nvme_loop_ctrl_list);
63static DEFINE_MUTEX(nvme_loop_ctrl_mutex);
64
65static void nvme_loop_queue_response(struct nvmet_req *nvme_req);
66static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl);
67
68static const struct nvmet_fabrics_ops nvme_loop_ops;
69
70static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue)
71{
72 return queue - queue->ctrl->queues;
73}
74
75static void nvme_loop_complete_rq(struct request *req)
76{
77 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
78
79 nvme_cleanup_cmd(req);
David Brazdil0f672f62019-12-10 10:32:29 +000080 sg_free_table_chained(&iod->sg_table, SG_CHUNK_SIZE);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000081 nvme_complete_rq(req);
82}
83
84static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue)
85{
86 u32 queue_idx = nvme_loop_queue_idx(queue);
87
88 if (queue_idx == 0)
89 return queue->ctrl->admin_tag_set.tags[queue_idx];
90 return queue->ctrl->tag_set.tags[queue_idx - 1];
91}
92
93static void nvme_loop_queue_response(struct nvmet_req *req)
94{
95 struct nvme_loop_queue *queue =
96 container_of(req->sq, struct nvme_loop_queue, nvme_sq);
David Brazdil0f672f62019-12-10 10:32:29 +000097 struct nvme_completion *cqe = req->cqe;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000098
99 /*
100 * AEN requests are special as they don't time out and can
101 * survive any kind of queue freeze and often don't respond to
102 * aborts. We don't even bother to allocate a struct request
103 * for them but rather special case them here.
104 */
105 if (unlikely(nvme_loop_queue_idx(queue) == 0 &&
106 cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) {
107 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
108 &cqe->result);
109 } else {
110 struct request *rq;
111
112 rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id);
113 if (!rq) {
114 dev_err(queue->ctrl->ctrl.device,
115 "tag 0x%x on queue %d not found\n",
116 cqe->command_id, nvme_loop_queue_idx(queue));
117 return;
118 }
119
120 nvme_end_request(rq, cqe->status, cqe->result);
121 }
122}
123
124static void nvme_loop_execute_work(struct work_struct *work)
125{
126 struct nvme_loop_iod *iod =
127 container_of(work, struct nvme_loop_iod, work);
128
129 nvmet_req_execute(&iod->req);
130}
131
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000132static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
133 const struct blk_mq_queue_data *bd)
134{
135 struct nvme_ns *ns = hctx->queue->queuedata;
136 struct nvme_loop_queue *queue = hctx->driver_data;
137 struct request *req = bd->rq;
138 struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
139 bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags);
140 blk_status_t ret;
141
142 if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready))
143 return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req);
144
145 ret = nvme_setup_cmd(ns, req, &iod->cmd);
146 if (ret)
147 return ret;
148
149 blk_mq_start_request(req);
150 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
151 iod->req.port = queue->ctrl->port;
152 if (!nvmet_req_init(&iod->req, &queue->nvme_cq,
153 &queue->nvme_sq, &nvme_loop_ops))
154 return BLK_STS_OK;
155
156 if (blk_rq_nr_phys_segments(req)) {
157 iod->sg_table.sgl = iod->first_sgl;
158 if (sg_alloc_table_chained(&iod->sg_table,
159 blk_rq_nr_phys_segments(req),
David Brazdil0f672f62019-12-10 10:32:29 +0000160 iod->sg_table.sgl, SG_CHUNK_SIZE)) {
161 nvme_cleanup_cmd(req);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000162 return BLK_STS_RESOURCE;
David Brazdil0f672f62019-12-10 10:32:29 +0000163 }
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000164
165 iod->req.sg = iod->sg_table.sgl;
166 iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl);
167 iod->req.transfer_len = blk_rq_payload_bytes(req);
168 }
169
170 schedule_work(&iod->work);
171 return BLK_STS_OK;
172}
173
174static void nvme_loop_submit_async_event(struct nvme_ctrl *arg)
175{
176 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg);
177 struct nvme_loop_queue *queue = &ctrl->queues[0];
178 struct nvme_loop_iod *iod = &ctrl->async_event_iod;
179
180 memset(&iod->cmd, 0, sizeof(iod->cmd));
181 iod->cmd.common.opcode = nvme_admin_async_event;
182 iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH;
183 iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
184
185 if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq,
186 &nvme_loop_ops)) {
187 dev_err(ctrl->ctrl.device, "failed async event work\n");
188 return;
189 }
190
191 schedule_work(&iod->work);
192}
193
194static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl,
195 struct nvme_loop_iod *iod, unsigned int queue_idx)
196{
197 iod->req.cmd = &iod->cmd;
David Brazdil0f672f62019-12-10 10:32:29 +0000198 iod->req.cqe = &iod->cqe;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000199 iod->queue = &ctrl->queues[queue_idx];
200 INIT_WORK(&iod->work, nvme_loop_execute_work);
201 return 0;
202}
203
204static int nvme_loop_init_request(struct blk_mq_tag_set *set,
205 struct request *req, unsigned int hctx_idx,
206 unsigned int numa_node)
207{
208 struct nvme_loop_ctrl *ctrl = set->driver_data;
209
210 nvme_req(req)->ctrl = &ctrl->ctrl;
211 return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req),
212 (set == &ctrl->tag_set) ? hctx_idx + 1 : 0);
213}
214
215static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
216 unsigned int hctx_idx)
217{
218 struct nvme_loop_ctrl *ctrl = data;
219 struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1];
220
221 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
222
223 hctx->driver_data = queue;
224 return 0;
225}
226
227static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
228 unsigned int hctx_idx)
229{
230 struct nvme_loop_ctrl *ctrl = data;
231 struct nvme_loop_queue *queue = &ctrl->queues[0];
232
233 BUG_ON(hctx_idx != 0);
234
235 hctx->driver_data = queue;
236 return 0;
237}
238
239static const struct blk_mq_ops nvme_loop_mq_ops = {
240 .queue_rq = nvme_loop_queue_rq,
241 .complete = nvme_loop_complete_rq,
242 .init_request = nvme_loop_init_request,
243 .init_hctx = nvme_loop_init_hctx,
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000244};
245
246static const struct blk_mq_ops nvme_loop_admin_mq_ops = {
247 .queue_rq = nvme_loop_queue_rq,
248 .complete = nvme_loop_complete_rq,
249 .init_request = nvme_loop_init_request,
250 .init_hctx = nvme_loop_init_admin_hctx,
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000251};
252
253static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl)
254{
Olivier Deprez0e641232021-09-23 10:07:05 +0200255 if (!test_and_clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags))
256 return;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000257 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
258 blk_cleanup_queue(ctrl->ctrl.admin_q);
David Brazdil0f672f62019-12-10 10:32:29 +0000259 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000260 blk_mq_free_tag_set(&ctrl->admin_tag_set);
261}
262
263static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl)
264{
265 struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
266
267 if (list_empty(&ctrl->list))
268 goto free_ctrl;
269
270 mutex_lock(&nvme_loop_ctrl_mutex);
271 list_del(&ctrl->list);
272 mutex_unlock(&nvme_loop_ctrl_mutex);
273
274 if (nctrl->tagset) {
275 blk_cleanup_queue(ctrl->ctrl.connect_q);
276 blk_mq_free_tag_set(&ctrl->tag_set);
277 }
278 kfree(ctrl->queues);
279 nvmf_free_options(nctrl->opts);
280free_ctrl:
281 kfree(ctrl);
282}
283
284static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl)
285{
286 int i;
287
288 for (i = 1; i < ctrl->ctrl.queue_count; i++) {
289 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags);
290 nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
291 }
Olivier Deprez0e641232021-09-23 10:07:05 +0200292 ctrl->ctrl.queue_count = 1;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000293}
294
295static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl)
296{
297 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
298 unsigned int nr_io_queues;
299 int ret, i;
300
301 nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
302 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
303 if (ret || !nr_io_queues)
304 return ret;
305
306 dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues);
307
308 for (i = 1; i <= nr_io_queues; i++) {
309 ctrl->queues[i].ctrl = ctrl;
310 ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq);
311 if (ret)
312 goto out_destroy_queues;
313
314 ctrl->ctrl.queue_count++;
315 }
316
317 return 0;
318
319out_destroy_queues:
320 nvme_loop_destroy_io_queues(ctrl);
321 return ret;
322}
323
324static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl)
325{
326 int i, ret;
327
328 for (i = 1; i < ctrl->ctrl.queue_count; i++) {
David Brazdil0f672f62019-12-10 10:32:29 +0000329 ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000330 if (ret)
331 return ret;
332 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags);
333 }
334
335 return 0;
336}
337
338static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl)
339{
340 int error;
341
342 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
343 ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops;
344 ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH;
345 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */
346 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
347 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
348 SG_CHUNK_SIZE * sizeof(struct scatterlist);
349 ctrl->admin_tag_set.driver_data = ctrl;
350 ctrl->admin_tag_set.nr_hw_queues = 1;
351 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
352 ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED;
353
354 ctrl->queues[0].ctrl = ctrl;
355 error = nvmet_sq_init(&ctrl->queues[0].nvme_sq);
356 if (error)
357 return error;
358 ctrl->ctrl.queue_count = 1;
359
360 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
361 if (error)
362 goto out_free_sq;
363 ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set;
364
David Brazdil0f672f62019-12-10 10:32:29 +0000365 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set);
366 if (IS_ERR(ctrl->ctrl.fabrics_q)) {
367 error = PTR_ERR(ctrl->ctrl.fabrics_q);
368 goto out_free_tagset;
369 }
370
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000371 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
372 if (IS_ERR(ctrl->ctrl.admin_q)) {
373 error = PTR_ERR(ctrl->ctrl.admin_q);
David Brazdil0f672f62019-12-10 10:32:29 +0000374 goto out_cleanup_fabrics_q;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000375 }
376
377 error = nvmf_connect_admin_queue(&ctrl->ctrl);
378 if (error)
379 goto out_cleanup_queue;
380
381 set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags);
382
David Brazdil0f672f62019-12-10 10:32:29 +0000383 error = nvme_enable_ctrl(&ctrl->ctrl);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000384 if (error)
385 goto out_cleanup_queue;
386
387 ctrl->ctrl.max_hw_sectors =
388 (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9);
389
David Brazdil0f672f62019-12-10 10:32:29 +0000390 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
391
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000392 error = nvme_init_identify(&ctrl->ctrl);
393 if (error)
394 goto out_cleanup_queue;
395
396 return 0;
397
398out_cleanup_queue:
Olivier Deprez0e641232021-09-23 10:07:05 +0200399 clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000400 blk_cleanup_queue(ctrl->ctrl.admin_q);
David Brazdil0f672f62019-12-10 10:32:29 +0000401out_cleanup_fabrics_q:
402 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000403out_free_tagset:
404 blk_mq_free_tag_set(&ctrl->admin_tag_set);
405out_free_sq:
406 nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
407 return error;
408}
409
410static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl)
411{
412 if (ctrl->ctrl.queue_count > 1) {
413 nvme_stop_queues(&ctrl->ctrl);
414 blk_mq_tagset_busy_iter(&ctrl->tag_set,
415 nvme_cancel_request, &ctrl->ctrl);
David Brazdil0f672f62019-12-10 10:32:29 +0000416 blk_mq_tagset_wait_completed_request(&ctrl->tag_set);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000417 nvme_loop_destroy_io_queues(ctrl);
418 }
419
David Brazdil0f672f62019-12-10 10:32:29 +0000420 blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000421 if (ctrl->ctrl.state == NVME_CTRL_LIVE)
422 nvme_shutdown_ctrl(&ctrl->ctrl);
423
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000424 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
425 nvme_cancel_request, &ctrl->ctrl);
David Brazdil0f672f62019-12-10 10:32:29 +0000426 blk_mq_tagset_wait_completed_request(&ctrl->admin_tag_set);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000427 nvme_loop_destroy_admin_queue(ctrl);
428}
429
430static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl)
431{
432 nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl));
433}
434
435static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl)
436{
437 struct nvme_loop_ctrl *ctrl;
438
439 mutex_lock(&nvme_loop_ctrl_mutex);
440 list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) {
441 if (ctrl->ctrl.cntlid == nctrl->cntlid)
442 nvme_delete_ctrl(&ctrl->ctrl);
443 }
444 mutex_unlock(&nvme_loop_ctrl_mutex);
445}
446
447static void nvme_loop_reset_ctrl_work(struct work_struct *work)
448{
449 struct nvme_loop_ctrl *ctrl =
450 container_of(work, struct nvme_loop_ctrl, ctrl.reset_work);
451 bool changed;
452 int ret;
453
454 nvme_stop_ctrl(&ctrl->ctrl);
455 nvme_loop_shutdown_ctrl(ctrl);
456
457 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
458 /* state change failure should never happen */
459 WARN_ON_ONCE(1);
460 return;
461 }
462
463 ret = nvme_loop_configure_admin_queue(ctrl);
464 if (ret)
465 goto out_disable;
466
467 ret = nvme_loop_init_io_queues(ctrl);
468 if (ret)
469 goto out_destroy_admin;
470
471 ret = nvme_loop_connect_io_queues(ctrl);
472 if (ret)
473 goto out_destroy_io;
474
475 blk_mq_update_nr_hw_queues(&ctrl->tag_set,
476 ctrl->ctrl.queue_count - 1);
477
478 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
479 WARN_ON_ONCE(!changed);
480
481 nvme_start_ctrl(&ctrl->ctrl);
482
483 return;
484
485out_destroy_io:
486 nvme_loop_destroy_io_queues(ctrl);
487out_destroy_admin:
488 nvme_loop_destroy_admin_queue(ctrl);
489out_disable:
490 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
491 nvme_uninit_ctrl(&ctrl->ctrl);
492 nvme_put_ctrl(&ctrl->ctrl);
493}
494
495static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
496 .name = "loop",
497 .module = THIS_MODULE,
498 .flags = NVME_F_FABRICS,
499 .reg_read32 = nvmf_reg_read32,
500 .reg_read64 = nvmf_reg_read64,
501 .reg_write32 = nvmf_reg_write32,
502 .free_ctrl = nvme_loop_free_ctrl,
503 .submit_async_event = nvme_loop_submit_async_event,
504 .delete_ctrl = nvme_loop_delete_ctrl_host,
505 .get_address = nvmf_get_address,
506};
507
508static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
509{
510 int ret;
511
512 ret = nvme_loop_init_io_queues(ctrl);
513 if (ret)
514 return ret;
515
516 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
517 ctrl->tag_set.ops = &nvme_loop_mq_ops;
518 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
519 ctrl->tag_set.reserved_tags = 1; /* fabric connect */
520 ctrl->tag_set.numa_node = NUMA_NO_NODE;
521 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
522 ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
523 SG_CHUNK_SIZE * sizeof(struct scatterlist);
524 ctrl->tag_set.driver_data = ctrl;
525 ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1;
526 ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
527 ctrl->ctrl.tagset = &ctrl->tag_set;
528
529 ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
530 if (ret)
531 goto out_destroy_queues;
532
533 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
534 if (IS_ERR(ctrl->ctrl.connect_q)) {
535 ret = PTR_ERR(ctrl->ctrl.connect_q);
536 goto out_free_tagset;
537 }
538
539 ret = nvme_loop_connect_io_queues(ctrl);
540 if (ret)
541 goto out_cleanup_connect_q;
542
543 return 0;
544
545out_cleanup_connect_q:
546 blk_cleanup_queue(ctrl->ctrl.connect_q);
547out_free_tagset:
548 blk_mq_free_tag_set(&ctrl->tag_set);
549out_destroy_queues:
550 nvme_loop_destroy_io_queues(ctrl);
551 return ret;
552}
553
554static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl)
555{
556 struct nvmet_port *p, *found = NULL;
557
558 mutex_lock(&nvme_loop_ports_mutex);
559 list_for_each_entry(p, &nvme_loop_ports, entry) {
560 /* if no transport address is specified use the first port */
561 if ((ctrl->opts->mask & NVMF_OPT_TRADDR) &&
562 strcmp(ctrl->opts->traddr, p->disc_addr.traddr))
563 continue;
564 found = p;
565 break;
566 }
567 mutex_unlock(&nvme_loop_ports_mutex);
568 return found;
569}
570
571static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
572 struct nvmf_ctrl_options *opts)
573{
574 struct nvme_loop_ctrl *ctrl;
575 bool changed;
576 int ret;
577
578 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
579 if (!ctrl)
580 return ERR_PTR(-ENOMEM);
581 ctrl->ctrl.opts = opts;
582 INIT_LIST_HEAD(&ctrl->list);
583
584 INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work);
585
586 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops,
587 0 /* no quirks, we're perfect! */);
588 if (ret)
589 goto out_put_ctrl;
590
591 ret = -ENOMEM;
592
593 ctrl->ctrl.sqsize = opts->queue_size - 1;
594 ctrl->ctrl.kato = opts->kato;
595 ctrl->port = nvme_loop_find_port(&ctrl->ctrl);
596
597 ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),
598 GFP_KERNEL);
599 if (!ctrl->queues)
600 goto out_uninit_ctrl;
601
602 ret = nvme_loop_configure_admin_queue(ctrl);
603 if (ret)
604 goto out_free_queues;
605
606 if (opts->queue_size > ctrl->ctrl.maxcmd) {
607 /* warn if maxcmd is lower than queue_size */
608 dev_warn(ctrl->ctrl.device,
609 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
610 opts->queue_size, ctrl->ctrl.maxcmd);
611 opts->queue_size = ctrl->ctrl.maxcmd;
612 }
613
614 if (opts->nr_io_queues) {
615 ret = nvme_loop_create_io_queues(ctrl);
616 if (ret)
617 goto out_remove_admin_queue;
618 }
619
620 nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0);
621
622 dev_info(ctrl->ctrl.device,
623 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
624
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000625 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
626 WARN_ON_ONCE(!changed);
627
628 mutex_lock(&nvme_loop_ctrl_mutex);
629 list_add_tail(&ctrl->list, &nvme_loop_ctrl_list);
630 mutex_unlock(&nvme_loop_ctrl_mutex);
631
632 nvme_start_ctrl(&ctrl->ctrl);
633
634 return &ctrl->ctrl;
635
636out_remove_admin_queue:
637 nvme_loop_destroy_admin_queue(ctrl);
638out_free_queues:
639 kfree(ctrl->queues);
640out_uninit_ctrl:
641 nvme_uninit_ctrl(&ctrl->ctrl);
Olivier Deprez0e641232021-09-23 10:07:05 +0200642 nvme_put_ctrl(&ctrl->ctrl);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000643out_put_ctrl:
644 nvme_put_ctrl(&ctrl->ctrl);
645 if (ret > 0)
646 ret = -EIO;
647 return ERR_PTR(ret);
648}
649
650static int nvme_loop_add_port(struct nvmet_port *port)
651{
652 mutex_lock(&nvme_loop_ports_mutex);
653 list_add_tail(&port->entry, &nvme_loop_ports);
654 mutex_unlock(&nvme_loop_ports_mutex);
655 return 0;
656}
657
658static void nvme_loop_remove_port(struct nvmet_port *port)
659{
660 mutex_lock(&nvme_loop_ports_mutex);
661 list_del_init(&port->entry);
662 mutex_unlock(&nvme_loop_ports_mutex);
David Brazdil0f672f62019-12-10 10:32:29 +0000663
664 /*
665 * Ensure any ctrls that are in the process of being
666 * deleted are in fact deleted before we return
667 * and free the port. This is to prevent active
668 * ctrls from using a port after it's freed.
669 */
670 flush_workqueue(nvme_delete_wq);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000671}
672
673static const 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,
680};
681
682static struct nvmf_transport_ops nvme_loop_transport = {
683 .name = "loop",
684 .module = THIS_MODULE,
685 .create_ctrl = nvme_loop_create_ctrl,
686 .allowed_opts = NVMF_OPT_TRADDR,
687};
688
689static int __init nvme_loop_init_module(void)
690{
691 int ret;
692
693 ret = nvmet_register_transport(&nvme_loop_ops);
694 if (ret)
695 return ret;
696
697 ret = nvmf_register_transport(&nvme_loop_transport);
698 if (ret)
699 nvmet_unregister_transport(&nvme_loop_ops);
700
701 return ret;
702}
703
704static void __exit nvme_loop_cleanup_module(void)
705{
706 struct nvme_loop_ctrl *ctrl, *next;
707
708 nvmf_unregister_transport(&nvme_loop_transport);
709 nvmet_unregister_transport(&nvme_loop_ops);
710
711 mutex_lock(&nvme_loop_ctrl_mutex);
712 list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list)
713 nvme_delete_ctrl(&ctrl->ctrl);
714 mutex_unlock(&nvme_loop_ctrl_mutex);
715
716 flush_workqueue(nvme_delete_wq);
717}
718
719module_init(nvme_loop_init_module);
720module_exit(nvme_loop_cleanup_module);
721
722MODULE_LICENSE("GPL v2");
723MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */