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Commit | Line | Data |
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3a85a5de CH |
1 | /* |
2 | * NVMe over Fabrics loopback device. | |
3 | * Copyright (c) 2015-2016 HGST, a Western Digital Company. | |
4 | * | |
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. | |
8 | * | |
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 | |
12 | * more details. | |
13 | */ | |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | #include <linux/scatterlist.h> | |
3a85a5de CH |
16 | #include <linux/blk-mq.h> |
17 | #include <linux/nvme.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/parser.h> | |
3a85a5de CH |
20 | #include "nvmet.h" |
21 | #include "../host/nvme.h" | |
22 | #include "../host/fabrics.h" | |
23 | ||
24 | #define NVME_LOOP_AQ_DEPTH 256 | |
25 | ||
26 | #define NVME_LOOP_MAX_SEGMENTS 256 | |
27 | ||
28 | /* | |
29 | * We handle AEN commands ourselves and don't even let the | |
30 | * block layer know about them. | |
31 | */ | |
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) | |
35 | ||
36 | struct nvme_loop_iod { | |
d49187e9 | 37 | struct nvme_request nvme_req; |
3a85a5de CH |
38 | struct nvme_command cmd; |
39 | struct nvme_completion rsp; | |
40 | struct nvmet_req req; | |
41 | struct nvme_loop_queue *queue; | |
42 | struct work_struct work; | |
43 | struct sg_table sg_table; | |
44 | struct scatterlist first_sgl[]; | |
45 | }; | |
46 | ||
47 | struct nvme_loop_ctrl { | |
48 | spinlock_t lock; | |
49 | struct nvme_loop_queue *queues; | |
50 | u32 queue_count; | |
51 | ||
52 | struct blk_mq_tag_set admin_tag_set; | |
53 | ||
54 | struct list_head list; | |
55 | u64 cap; | |
56 | struct blk_mq_tag_set tag_set; | |
57 | struct nvme_loop_iod async_event_iod; | |
58 | struct nvme_ctrl ctrl; | |
59 | ||
60 | struct nvmet_ctrl *target_ctrl; | |
61 | struct work_struct delete_work; | |
62 | struct work_struct reset_work; | |
63 | }; | |
64 | ||
65 | static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) | |
66 | { | |
67 | return container_of(ctrl, struct nvme_loop_ctrl, ctrl); | |
68 | } | |
69 | ||
70 | struct nvme_loop_queue { | |
71 | struct nvmet_cq nvme_cq; | |
72 | struct nvmet_sq nvme_sq; | |
73 | struct nvme_loop_ctrl *ctrl; | |
74 | }; | |
75 | ||
76 | static struct nvmet_port *nvmet_loop_port; | |
77 | ||
78 | static LIST_HEAD(nvme_loop_ctrl_list); | |
79 | static DEFINE_MUTEX(nvme_loop_ctrl_mutex); | |
80 | ||
81 | static void nvme_loop_queue_response(struct nvmet_req *nvme_req); | |
82 | static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); | |
83 | ||
84 | static struct nvmet_fabrics_ops nvme_loop_ops; | |
85 | ||
86 | static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) | |
87 | { | |
88 | return queue - queue->ctrl->queues; | |
89 | } | |
90 | ||
91 | static void nvme_loop_complete_rq(struct request *req) | |
92 | { | |
93 | struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); | |
3a85a5de CH |
94 | |
95 | nvme_cleanup_cmd(req); | |
96 | sg_free_table_chained(&iod->sg_table, true); | |
77f02a7a | 97 | nvme_complete_rq(req); |
3a85a5de | 98 | } |
3a85a5de | 99 | |
3b068376 SG |
100 | static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) |
101 | { | |
102 | u32 queue_idx = nvme_loop_queue_idx(queue); | |
3a85a5de | 103 | |
3b068376 SG |
104 | if (queue_idx == 0) |
105 | return queue->ctrl->admin_tag_set.tags[queue_idx]; | |
106 | return queue->ctrl->tag_set.tags[queue_idx - 1]; | |
3a85a5de CH |
107 | } |
108 | ||
d49187e9 | 109 | static void nvme_loop_queue_response(struct nvmet_req *req) |
3a85a5de | 110 | { |
3b068376 SG |
111 | struct nvme_loop_queue *queue = |
112 | container_of(req->sq, struct nvme_loop_queue, nvme_sq); | |
113 | struct nvme_completion *cqe = req->rsp; | |
3a85a5de CH |
114 | |
115 | /* | |
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. | |
120 | */ | |
3b068376 | 121 | if (unlikely(nvme_loop_queue_idx(queue) == 0 && |
3a85a5de | 122 | cqe->command_id >= NVME_LOOP_AQ_BLKMQ_DEPTH)) { |
3b068376 | 123 | nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, |
7bf58533 | 124 | &cqe->result); |
3a85a5de | 125 | } else { |
3b068376 | 126 | struct request *rq; |
3b068376 SG |
127 | |
128 | rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); | |
129 | if (!rq) { | |
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)); | |
133 | return; | |
134 | } | |
3a85a5de | 135 | |
27fa9bc5 | 136 | nvme_end_request(rq, cqe->status, cqe->result); |
3a85a5de CH |
137 | } |
138 | } | |
139 | ||
140 | static void nvme_loop_execute_work(struct work_struct *work) | |
141 | { | |
142 | struct nvme_loop_iod *iod = | |
143 | container_of(work, struct nvme_loop_iod, work); | |
144 | ||
145 | iod->req.execute(&iod->req); | |
146 | } | |
147 | ||
148 | static enum blk_eh_timer_return | |
149 | nvme_loop_timeout(struct request *rq, bool reserved) | |
150 | { | |
151 | struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq); | |
152 | ||
153 | /* queue error recovery */ | |
154 | schedule_work(&iod->queue->ctrl->reset_work); | |
155 | ||
156 | /* fail with DNR on admin cmd timeout */ | |
27fa9bc5 | 157 | nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR; |
3a85a5de CH |
158 | |
159 | return BLK_EH_HANDLED; | |
160 | } | |
161 | ||
162 | static int nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, | |
163 | const struct blk_mq_queue_data *bd) | |
164 | { | |
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); | |
169 | int ret; | |
170 | ||
171 | ret = nvme_setup_cmd(ns, req, &iod->cmd); | |
bac0000a | 172 | if (ret != BLK_MQ_RQ_QUEUE_OK) |
3a85a5de CH |
173 | return ret; |
174 | ||
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); | |
bac0000a | 182 | return BLK_MQ_RQ_QUEUE_OK; |
3a85a5de CH |
183 | } |
184 | ||
185 | if (blk_rq_bytes(req)) { | |
186 | iod->sg_table.sgl = iod->first_sgl; | |
187 | ret = sg_alloc_table_chained(&iod->sg_table, | |
f9d03f96 CH |
188 | blk_rq_nr_phys_segments(req), |
189 | iod->sg_table.sgl); | |
3a85a5de CH |
190 | if (ret) |
191 | return BLK_MQ_RQ_QUEUE_BUSY; | |
192 | ||
193 | iod->req.sg = iod->sg_table.sgl; | |
194 | iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); | |
3a85a5de CH |
195 | } |
196 | ||
3a85a5de CH |
197 | blk_mq_start_request(req); |
198 | ||
199 | schedule_work(&iod->work); | |
bac0000a | 200 | return BLK_MQ_RQ_QUEUE_OK; |
3a85a5de CH |
201 | } |
202 | ||
203 | static void nvme_loop_submit_async_event(struct nvme_ctrl *arg, int aer_idx) | |
204 | { | |
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; | |
208 | ||
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; | |
213 | ||
214 | if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, | |
215 | &nvme_loop_ops)) { | |
216 | dev_err(ctrl->ctrl.device, "failed async event work\n"); | |
217 | return; | |
218 | } | |
219 | ||
220 | schedule_work(&iod->work); | |
221 | } | |
222 | ||
223 | static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, | |
224 | struct nvme_loop_iod *iod, unsigned int queue_idx) | |
225 | { | |
3a85a5de CH |
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); | |
230 | return 0; | |
231 | } | |
232 | ||
d6296d39 CH |
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) | |
3a85a5de | 236 | { |
d6296d39 CH |
237 | return nvme_loop_init_iod(set->driver_data, blk_mq_rq_to_pdu(req), |
238 | hctx_idx + 1); | |
3a85a5de CH |
239 | } |
240 | ||
d6296d39 CH |
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) | |
3a85a5de | 244 | { |
d6296d39 | 245 | return nvme_loop_init_iod(set->driver_data, blk_mq_rq_to_pdu(req), 0); |
3a85a5de CH |
246 | } |
247 | ||
248 | static int nvme_loop_init_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[hctx_idx + 1]; | |
253 | ||
254 | BUG_ON(hctx_idx >= ctrl->queue_count); | |
255 | ||
256 | hctx->driver_data = queue; | |
257 | return 0; | |
258 | } | |
259 | ||
260 | static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
261 | unsigned int hctx_idx) | |
262 | { | |
263 | struct nvme_loop_ctrl *ctrl = data; | |
264 | struct nvme_loop_queue *queue = &ctrl->queues[0]; | |
265 | ||
266 | BUG_ON(hctx_idx != 0); | |
267 | ||
268 | hctx->driver_data = queue; | |
269 | return 0; | |
270 | } | |
271 | ||
f363b089 | 272 | static const struct blk_mq_ops nvme_loop_mq_ops = { |
3a85a5de CH |
273 | .queue_rq = nvme_loop_queue_rq, |
274 | .complete = nvme_loop_complete_rq, | |
3a85a5de CH |
275 | .init_request = nvme_loop_init_request, |
276 | .init_hctx = nvme_loop_init_hctx, | |
277 | .timeout = nvme_loop_timeout, | |
278 | }; | |
279 | ||
f363b089 | 280 | static const struct blk_mq_ops nvme_loop_admin_mq_ops = { |
3a85a5de CH |
281 | .queue_rq = nvme_loop_queue_rq, |
282 | .complete = nvme_loop_complete_rq, | |
3a85a5de CH |
283 | .init_request = nvme_loop_init_admin_request, |
284 | .init_hctx = nvme_loop_init_admin_hctx, | |
285 | .timeout = nvme_loop_timeout, | |
286 | }; | |
287 | ||
288 | static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) | |
289 | { | |
e4c5d376 | 290 | nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); |
3a85a5de CH |
291 | blk_cleanup_queue(ctrl->ctrl.admin_q); |
292 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
3a85a5de CH |
293 | } |
294 | ||
295 | static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) | |
296 | { | |
297 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); | |
298 | ||
299 | if (list_empty(&ctrl->list)) | |
300 | goto free_ctrl; | |
301 | ||
302 | mutex_lock(&nvme_loop_ctrl_mutex); | |
303 | list_del(&ctrl->list); | |
304 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
305 | ||
306 | if (nctrl->tagset) { | |
307 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
308 | blk_mq_free_tag_set(&ctrl->tag_set); | |
309 | } | |
310 | kfree(ctrl->queues); | |
311 | nvmf_free_options(nctrl->opts); | |
312 | free_ctrl: | |
313 | kfree(ctrl); | |
314 | } | |
315 | ||
945dd5ba SG |
316 | static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) |
317 | { | |
318 | int i; | |
319 | ||
320 | for (i = 1; i < ctrl->queue_count; i++) | |
321 | nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); | |
322 | } | |
323 | ||
324 | static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) | |
325 | { | |
326 | struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; | |
327 | unsigned int nr_io_queues; | |
328 | int ret, i; | |
329 | ||
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) | |
333 | return ret; | |
334 | ||
335 | dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); | |
336 | ||
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); | |
340 | if (ret) | |
341 | goto out_destroy_queues; | |
342 | ||
343 | ctrl->queue_count++; | |
344 | } | |
345 | ||
346 | return 0; | |
347 | ||
348 | out_destroy_queues: | |
349 | nvme_loop_destroy_io_queues(ctrl); | |
350 | return ret; | |
351 | } | |
352 | ||
297186d6 SG |
353 | static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) |
354 | { | |
355 | int i, ret; | |
356 | ||
357 | for (i = 1; i < ctrl->queue_count; i++) { | |
358 | ret = nvmf_connect_io_queue(&ctrl->ctrl, i); | |
359 | if (ret) | |
360 | return ret; | |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
3a85a5de CH |
366 | static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) |
367 | { | |
368 | int error; | |
369 | ||
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; | |
380 | ||
381 | ctrl->queues[0].ctrl = ctrl; | |
382 | error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); | |
383 | if (error) | |
384 | return error; | |
385 | ctrl->queue_count = 1; | |
386 | ||
387 | error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); | |
388 | if (error) | |
389 | goto out_free_sq; | |
390 | ||
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; | |
395 | } | |
396 | ||
397 | error = nvmf_connect_admin_queue(&ctrl->ctrl); | |
398 | if (error) | |
399 | goto out_cleanup_queue; | |
400 | ||
401 | error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap); | |
402 | if (error) { | |
403 | dev_err(ctrl->ctrl.device, | |
404 | "prop_get NVME_REG_CAP failed\n"); | |
405 | goto out_cleanup_queue; | |
406 | } | |
407 | ||
408 | ctrl->ctrl.sqsize = | |
096e9e91 | 409 | min_t(int, NVME_CAP_MQES(ctrl->cap), ctrl->ctrl.sqsize); |
3a85a5de CH |
410 | |
411 | error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap); | |
412 | if (error) | |
413 | goto out_cleanup_queue; | |
414 | ||
415 | ctrl->ctrl.max_hw_sectors = | |
416 | (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); | |
417 | ||
418 | error = nvme_init_identify(&ctrl->ctrl); | |
419 | if (error) | |
420 | goto out_cleanup_queue; | |
421 | ||
422 | nvme_start_keep_alive(&ctrl->ctrl); | |
423 | ||
424 | return 0; | |
425 | ||
426 | out_cleanup_queue: | |
427 | blk_cleanup_queue(ctrl->ctrl.admin_q); | |
428 | out_free_tagset: | |
429 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
430 | out_free_sq: | |
431 | nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); | |
432 | return error; | |
433 | } | |
434 | ||
435 | static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) | |
436 | { | |
3a85a5de CH |
437 | nvme_stop_keep_alive(&ctrl->ctrl); |
438 | ||
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); | |
945dd5ba | 443 | nvme_loop_destroy_io_queues(ctrl); |
3a85a5de CH |
444 | } |
445 | ||
446 | if (ctrl->ctrl.state == NVME_CTRL_LIVE) | |
447 | nvme_shutdown_ctrl(&ctrl->ctrl); | |
448 | ||
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); | |
453 | } | |
454 | ||
455 | static void nvme_loop_del_ctrl_work(struct work_struct *work) | |
456 | { | |
457 | struct nvme_loop_ctrl *ctrl = container_of(work, | |
458 | struct nvme_loop_ctrl, delete_work); | |
459 | ||
3a85a5de | 460 | nvme_uninit_ctrl(&ctrl->ctrl); |
a159c64d | 461 | nvme_loop_shutdown_ctrl(ctrl); |
3a85a5de CH |
462 | nvme_put_ctrl(&ctrl->ctrl); |
463 | } | |
464 | ||
465 | static int __nvme_loop_del_ctrl(struct nvme_loop_ctrl *ctrl) | |
466 | { | |
467 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) | |
468 | return -EBUSY; | |
469 | ||
470 | if (!schedule_work(&ctrl->delete_work)) | |
471 | return -EBUSY; | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | static int nvme_loop_del_ctrl(struct nvme_ctrl *nctrl) | |
477 | { | |
478 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); | |
479 | int ret; | |
480 | ||
481 | ret = __nvme_loop_del_ctrl(ctrl); | |
482 | if (ret) | |
483 | return ret; | |
484 | ||
485 | flush_work(&ctrl->delete_work); | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
490 | static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) | |
491 | { | |
492 | struct nvme_loop_ctrl *ctrl; | |
493 | ||
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); | |
498 | } | |
499 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
500 | } | |
501 | ||
502 | static void nvme_loop_reset_ctrl_work(struct work_struct *work) | |
503 | { | |
504 | struct nvme_loop_ctrl *ctrl = container_of(work, | |
505 | struct nvme_loop_ctrl, reset_work); | |
506 | bool changed; | |
297186d6 | 507 | int ret; |
3a85a5de CH |
508 | |
509 | nvme_loop_shutdown_ctrl(ctrl); | |
510 | ||
511 | ret = nvme_loop_configure_admin_queue(ctrl); | |
512 | if (ret) | |
513 | goto out_disable; | |
514 | ||
945dd5ba SG |
515 | ret = nvme_loop_init_io_queues(ctrl); |
516 | if (ret) | |
517 | goto out_destroy_admin; | |
3a85a5de | 518 | |
297186d6 SG |
519 | ret = nvme_loop_connect_io_queues(ctrl); |
520 | if (ret) | |
521 | goto out_destroy_io; | |
3a85a5de CH |
522 | |
523 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
524 | WARN_ON_ONCE(!changed); | |
525 | ||
526 | nvme_queue_scan(&ctrl->ctrl); | |
527 | nvme_queue_async_events(&ctrl->ctrl); | |
528 | ||
529 | nvme_start_queues(&ctrl->ctrl); | |
530 | ||
531 | return; | |
532 | ||
945dd5ba SG |
533 | out_destroy_io: |
534 | nvme_loop_destroy_io_queues(ctrl); | |
535 | out_destroy_admin: | |
3a85a5de CH |
536 | nvme_loop_destroy_admin_queue(ctrl); |
537 | out_disable: | |
538 | dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); | |
3a85a5de CH |
539 | nvme_uninit_ctrl(&ctrl->ctrl); |
540 | nvme_put_ctrl(&ctrl->ctrl); | |
541 | } | |
542 | ||
543 | static int nvme_loop_reset_ctrl(struct nvme_ctrl *nctrl) | |
544 | { | |
545 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); | |
546 | ||
547 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING)) | |
548 | return -EBUSY; | |
549 | ||
550 | if (!schedule_work(&ctrl->reset_work)) | |
551 | return -EBUSY; | |
552 | ||
553 | flush_work(&ctrl->reset_work); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { | |
559 | .name = "loop", | |
560 | .module = THIS_MODULE, | |
d3d5b87d | 561 | .flags = NVME_F_FABRICS, |
3a85a5de CH |
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, | |
570 | }; | |
571 | ||
572 | static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) | |
573 | { | |
297186d6 | 574 | int ret; |
3a85a5de | 575 | |
945dd5ba SG |
576 | ret = nvme_loop_init_io_queues(ctrl); |
577 | if (ret) | |
3a85a5de CH |
578 | return ret; |
579 | ||
3a85a5de CH |
580 | memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); |
581 | ctrl->tag_set.ops = &nvme_loop_mq_ops; | |
eadb7cf4 | 582 | ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; |
3a85a5de CH |
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; | |
592 | ||
593 | ret = blk_mq_alloc_tag_set(&ctrl->tag_set); | |
594 | if (ret) | |
595 | goto out_destroy_queues; | |
596 | ||
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; | |
601 | } | |
602 | ||
297186d6 SG |
603 | ret = nvme_loop_connect_io_queues(ctrl); |
604 | if (ret) | |
605 | goto out_cleanup_connect_q; | |
3a85a5de CH |
606 | |
607 | return 0; | |
608 | ||
609 | out_cleanup_connect_q: | |
610 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
611 | out_free_tagset: | |
612 | blk_mq_free_tag_set(&ctrl->tag_set); | |
613 | out_destroy_queues: | |
945dd5ba | 614 | nvme_loop_destroy_io_queues(ctrl); |
3a85a5de CH |
615 | return ret; |
616 | } | |
617 | ||
618 | static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, | |
619 | struct nvmf_ctrl_options *opts) | |
620 | { | |
621 | struct nvme_loop_ctrl *ctrl; | |
622 | bool changed; | |
623 | int ret; | |
624 | ||
625 | ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); | |
626 | if (!ctrl) | |
627 | return ERR_PTR(-ENOMEM); | |
628 | ctrl->ctrl.opts = opts; | |
629 | INIT_LIST_HEAD(&ctrl->list); | |
630 | ||
631 | INIT_WORK(&ctrl->delete_work, nvme_loop_del_ctrl_work); | |
632 | INIT_WORK(&ctrl->reset_work, nvme_loop_reset_ctrl_work); | |
633 | ||
634 | ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, | |
635 | 0 /* no quirks, we're perfect! */); | |
636 | if (ret) | |
637 | goto out_put_ctrl; | |
638 | ||
639 | spin_lock_init(&ctrl->lock); | |
640 | ||
641 | ret = -ENOMEM; | |
642 | ||
eadb7cf4 | 643 | ctrl->ctrl.sqsize = opts->queue_size - 1; |
3a85a5de CH |
644 | ctrl->ctrl.kato = opts->kato; |
645 | ||
646 | ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), | |
647 | GFP_KERNEL); | |
648 | if (!ctrl->queues) | |
649 | goto out_uninit_ctrl; | |
650 | ||
651 | ret = nvme_loop_configure_admin_queue(ctrl); | |
652 | if (ret) | |
653 | goto out_free_queues; | |
654 | ||
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; | |
661 | } | |
662 | ||
663 | if (opts->nr_io_queues) { | |
664 | ret = nvme_loop_create_io_queues(ctrl); | |
665 | if (ret) | |
666 | goto out_remove_admin_queue; | |
667 | } | |
668 | ||
669 | nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); | |
670 | ||
671 | dev_info(ctrl->ctrl.device, | |
672 | "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); | |
673 | ||
674 | kref_get(&ctrl->ctrl.kref); | |
675 | ||
676 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
677 | WARN_ON_ONCE(!changed); | |
678 | ||
679 | mutex_lock(&nvme_loop_ctrl_mutex); | |
680 | list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); | |
681 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
682 | ||
683 | if (opts->nr_io_queues) { | |
684 | nvme_queue_scan(&ctrl->ctrl); | |
685 | nvme_queue_async_events(&ctrl->ctrl); | |
686 | } | |
687 | ||
688 | return &ctrl->ctrl; | |
689 | ||
690 | out_remove_admin_queue: | |
691 | nvme_loop_destroy_admin_queue(ctrl); | |
692 | out_free_queues: | |
693 | kfree(ctrl->queues); | |
694 | out_uninit_ctrl: | |
695 | nvme_uninit_ctrl(&ctrl->ctrl); | |
696 | out_put_ctrl: | |
697 | nvme_put_ctrl(&ctrl->ctrl); | |
698 | if (ret > 0) | |
699 | ret = -EIO; | |
700 | return ERR_PTR(ret); | |
701 | } | |
702 | ||
703 | static int nvme_loop_add_port(struct nvmet_port *port) | |
704 | { | |
705 | /* | |
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. | |
713 | */ | |
714 | ||
715 | if (nvmet_loop_port) | |
716 | return -EPERM; | |
717 | ||
718 | nvmet_loop_port = port; | |
719 | return 0; | |
720 | } | |
721 | ||
722 | static void nvme_loop_remove_port(struct nvmet_port *port) | |
723 | { | |
724 | if (port == nvmet_loop_port) | |
725 | nvmet_loop_port = NULL; | |
726 | } | |
727 | ||
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, | |
735 | }; | |
736 | ||
737 | static struct nvmf_transport_ops nvme_loop_transport = { | |
738 | .name = "loop", | |
739 | .create_ctrl = nvme_loop_create_ctrl, | |
740 | }; | |
741 | ||
742 | static int __init nvme_loop_init_module(void) | |
743 | { | |
744 | int ret; | |
745 | ||
746 | ret = nvmet_register_transport(&nvme_loop_ops); | |
747 | if (ret) | |
748 | return ret; | |
d19eef02 SG |
749 | |
750 | ret = nvmf_register_transport(&nvme_loop_transport); | |
751 | if (ret) | |
752 | nvmet_unregister_transport(&nvme_loop_ops); | |
753 | ||
754 | return ret; | |
3a85a5de CH |
755 | } |
756 | ||
757 | static void __exit nvme_loop_cleanup_module(void) | |
758 | { | |
759 | struct nvme_loop_ctrl *ctrl, *next; | |
760 | ||
761 | nvmf_unregister_transport(&nvme_loop_transport); | |
762 | nvmet_unregister_transport(&nvme_loop_ops); | |
763 | ||
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); | |
768 | ||
769 | flush_scheduled_work(); | |
770 | } | |
771 | ||
772 | module_init(nvme_loop_init_module); | |
773 | module_exit(nvme_loop_cleanup_module); | |
774 | ||
775 | MODULE_LICENSE("GPL v2"); | |
776 | MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ |