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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 | ||
3a85a5de CH |
24 | #define NVME_LOOP_MAX_SEGMENTS 256 |
25 | ||
3a85a5de | 26 | struct nvme_loop_iod { |
d49187e9 | 27 | struct nvme_request nvme_req; |
3a85a5de CH |
28 | struct nvme_command cmd; |
29 | struct nvme_completion rsp; | |
30 | struct nvmet_req req; | |
31 | struct nvme_loop_queue *queue; | |
32 | struct work_struct work; | |
33 | struct sg_table sg_table; | |
34 | struct scatterlist first_sgl[]; | |
35 | }; | |
36 | ||
37 | struct nvme_loop_ctrl { | |
3a85a5de | 38 | struct nvme_loop_queue *queues; |
3a85a5de CH |
39 | |
40 | struct blk_mq_tag_set admin_tag_set; | |
41 | ||
42 | struct list_head list; | |
3a85a5de CH |
43 | struct blk_mq_tag_set tag_set; |
44 | struct nvme_loop_iod async_event_iod; | |
45 | struct nvme_ctrl ctrl; | |
46 | ||
47 | struct nvmet_ctrl *target_ctrl; | |
3a85a5de CH |
48 | }; |
49 | ||
50 | static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) | |
51 | { | |
52 | return container_of(ctrl, struct nvme_loop_ctrl, ctrl); | |
53 | } | |
54 | ||
9d7fab04 SG |
55 | enum nvme_loop_queue_flags { |
56 | NVME_LOOP_Q_LIVE = 0, | |
57 | }; | |
58 | ||
3a85a5de CH |
59 | struct nvme_loop_queue { |
60 | struct nvmet_cq nvme_cq; | |
61 | struct nvmet_sq nvme_sq; | |
62 | struct nvme_loop_ctrl *ctrl; | |
9d7fab04 | 63 | unsigned long flags; |
3a85a5de CH |
64 | }; |
65 | ||
66 | static struct nvmet_port *nvmet_loop_port; | |
67 | ||
68 | static LIST_HEAD(nvme_loop_ctrl_list); | |
69 | static DEFINE_MUTEX(nvme_loop_ctrl_mutex); | |
70 | ||
71 | static void nvme_loop_queue_response(struct nvmet_req *nvme_req); | |
72 | static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); | |
73 | ||
e929f06d | 74 | static const struct nvmet_fabrics_ops nvme_loop_ops; |
3a85a5de CH |
75 | |
76 | static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) | |
77 | { | |
78 | return queue - queue->ctrl->queues; | |
79 | } | |
80 | ||
81 | static void nvme_loop_complete_rq(struct request *req) | |
82 | { | |
83 | struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); | |
3a85a5de CH |
84 | |
85 | nvme_cleanup_cmd(req); | |
86 | sg_free_table_chained(&iod->sg_table, true); | |
77f02a7a | 87 | nvme_complete_rq(req); |
3a85a5de | 88 | } |
3a85a5de | 89 | |
3b068376 SG |
90 | static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) |
91 | { | |
92 | u32 queue_idx = nvme_loop_queue_idx(queue); | |
3a85a5de | 93 | |
3b068376 SG |
94 | if (queue_idx == 0) |
95 | return queue->ctrl->admin_tag_set.tags[queue_idx]; | |
96 | return queue->ctrl->tag_set.tags[queue_idx - 1]; | |
3a85a5de CH |
97 | } |
98 | ||
d49187e9 | 99 | static void nvme_loop_queue_response(struct nvmet_req *req) |
3a85a5de | 100 | { |
3b068376 SG |
101 | struct nvme_loop_queue *queue = |
102 | container_of(req->sq, struct nvme_loop_queue, nvme_sq); | |
103 | struct nvme_completion *cqe = req->rsp; | |
3a85a5de CH |
104 | |
105 | /* | |
106 | * AEN requests are special as they don't time out and can | |
107 | * survive any kind of queue freeze and often don't respond to | |
108 | * aborts. We don't even bother to allocate a struct request | |
109 | * for them but rather special case them here. | |
110 | */ | |
3b068376 | 111 | if (unlikely(nvme_loop_queue_idx(queue) == 0 && |
38dabe21 | 112 | cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { |
3b068376 | 113 | nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, |
7bf58533 | 114 | &cqe->result); |
3a85a5de | 115 | } else { |
3b068376 | 116 | struct request *rq; |
3b068376 SG |
117 | |
118 | rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id); | |
119 | if (!rq) { | |
120 | dev_err(queue->ctrl->ctrl.device, | |
121 | "tag 0x%x on queue %d not found\n", | |
122 | cqe->command_id, nvme_loop_queue_idx(queue)); | |
123 | return; | |
124 | } | |
3a85a5de | 125 | |
27fa9bc5 | 126 | nvme_end_request(rq, cqe->status, cqe->result); |
3a85a5de CH |
127 | } |
128 | } | |
129 | ||
130 | static void nvme_loop_execute_work(struct work_struct *work) | |
131 | { | |
132 | struct nvme_loop_iod *iod = | |
133 | container_of(work, struct nvme_loop_iod, work); | |
134 | ||
5e62d5c9 | 135 | nvmet_req_execute(&iod->req); |
3a85a5de CH |
136 | } |
137 | ||
138 | static enum blk_eh_timer_return | |
139 | nvme_loop_timeout(struct request *rq, bool reserved) | |
140 | { | |
141 | struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq); | |
142 | ||
143 | /* queue error recovery */ | |
d86c4d8e | 144 | nvme_reset_ctrl(&iod->queue->ctrl->ctrl); |
3a85a5de CH |
145 | |
146 | /* fail with DNR on admin cmd timeout */ | |
27fa9bc5 | 147 | nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR; |
3a85a5de CH |
148 | |
149 | return BLK_EH_HANDLED; | |
150 | } | |
151 | ||
fc17b653 | 152 | static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, |
3a85a5de CH |
153 | const struct blk_mq_queue_data *bd) |
154 | { | |
155 | struct nvme_ns *ns = hctx->queue->queuedata; | |
156 | struct nvme_loop_queue *queue = hctx->driver_data; | |
157 | struct request *req = bd->rq; | |
158 | struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); | |
fc17b653 | 159 | blk_status_t ret; |
3a85a5de | 160 | |
bb06ec31 JS |
161 | ret = nvmf_check_if_ready(&queue->ctrl->ctrl, req, |
162 | test_bit(NVME_LOOP_Q_LIVE, &queue->flags), true); | |
9d7fab04 SG |
163 | if (unlikely(ret)) |
164 | return ret; | |
165 | ||
3a85a5de | 166 | ret = nvme_setup_cmd(ns, req, &iod->cmd); |
fc17b653 | 167 | if (ret) |
3a85a5de CH |
168 | return ret; |
169 | ||
11d9ea6f | 170 | blk_mq_start_request(req); |
3a85a5de CH |
171 | iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; |
172 | iod->req.port = nvmet_loop_port; | |
173 | if (!nvmet_req_init(&iod->req, &queue->nvme_cq, | |
11d9ea6f | 174 | &queue->nvme_sq, &nvme_loop_ops)) |
fc17b653 | 175 | return BLK_STS_OK; |
3a85a5de | 176 | |
796b0b8d | 177 | if (blk_rq_payload_bytes(req)) { |
3a85a5de | 178 | iod->sg_table.sgl = iod->first_sgl; |
fc17b653 | 179 | if (sg_alloc_table_chained(&iod->sg_table, |
f9d03f96 | 180 | blk_rq_nr_phys_segments(req), |
fc17b653 CH |
181 | iod->sg_table.sgl)) |
182 | return BLK_STS_RESOURCE; | |
3a85a5de CH |
183 | |
184 | iod->req.sg = iod->sg_table.sgl; | |
185 | iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); | |
796b0b8d | 186 | iod->req.transfer_len = blk_rq_payload_bytes(req); |
3a85a5de CH |
187 | } |
188 | ||
3a85a5de | 189 | schedule_work(&iod->work); |
fc17b653 | 190 | return BLK_STS_OK; |
3a85a5de CH |
191 | } |
192 | ||
ad22c355 | 193 | static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) |
3a85a5de CH |
194 | { |
195 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); | |
196 | struct nvme_loop_queue *queue = &ctrl->queues[0]; | |
197 | struct nvme_loop_iod *iod = &ctrl->async_event_iod; | |
198 | ||
199 | memset(&iod->cmd, 0, sizeof(iod->cmd)); | |
200 | iod->cmd.common.opcode = nvme_admin_async_event; | |
38dabe21 | 201 | iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; |
3a85a5de CH |
202 | iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; |
203 | ||
204 | if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, | |
205 | &nvme_loop_ops)) { | |
206 | dev_err(ctrl->ctrl.device, "failed async event work\n"); | |
207 | return; | |
208 | } | |
209 | ||
210 | schedule_work(&iod->work); | |
211 | } | |
212 | ||
213 | static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, | |
214 | struct nvme_loop_iod *iod, unsigned int queue_idx) | |
215 | { | |
3a85a5de CH |
216 | iod->req.cmd = &iod->cmd; |
217 | iod->req.rsp = &iod->rsp; | |
218 | iod->queue = &ctrl->queues[queue_idx]; | |
219 | INIT_WORK(&iod->work, nvme_loop_execute_work); | |
220 | return 0; | |
221 | } | |
222 | ||
d6296d39 CH |
223 | static int nvme_loop_init_request(struct blk_mq_tag_set *set, |
224 | struct request *req, unsigned int hctx_idx, | |
225 | unsigned int numa_node) | |
3a85a5de | 226 | { |
62b83b18 | 227 | struct nvme_loop_ctrl *ctrl = set->driver_data; |
3a85a5de | 228 | |
62b83b18 CH |
229 | return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), |
230 | (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); | |
3a85a5de CH |
231 | } |
232 | ||
233 | static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
234 | unsigned int hctx_idx) | |
235 | { | |
236 | struct nvme_loop_ctrl *ctrl = data; | |
237 | struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; | |
238 | ||
d858e5f0 | 239 | BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); |
3a85a5de CH |
240 | |
241 | hctx->driver_data = queue; | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
246 | unsigned int hctx_idx) | |
247 | { | |
248 | struct nvme_loop_ctrl *ctrl = data; | |
249 | struct nvme_loop_queue *queue = &ctrl->queues[0]; | |
250 | ||
251 | BUG_ON(hctx_idx != 0); | |
252 | ||
253 | hctx->driver_data = queue; | |
254 | return 0; | |
255 | } | |
256 | ||
f363b089 | 257 | static const struct blk_mq_ops nvme_loop_mq_ops = { |
3a85a5de CH |
258 | .queue_rq = nvme_loop_queue_rq, |
259 | .complete = nvme_loop_complete_rq, | |
3a85a5de CH |
260 | .init_request = nvme_loop_init_request, |
261 | .init_hctx = nvme_loop_init_hctx, | |
262 | .timeout = nvme_loop_timeout, | |
263 | }; | |
264 | ||
f363b089 | 265 | static const struct blk_mq_ops nvme_loop_admin_mq_ops = { |
3a85a5de CH |
266 | .queue_rq = nvme_loop_queue_rq, |
267 | .complete = nvme_loop_complete_rq, | |
62b83b18 | 268 | .init_request = nvme_loop_init_request, |
3a85a5de CH |
269 | .init_hctx = nvme_loop_init_admin_hctx, |
270 | .timeout = nvme_loop_timeout, | |
271 | }; | |
272 | ||
273 | static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) | |
274 | { | |
9d7fab04 | 275 | clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); |
e4c5d376 | 276 | nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); |
3a85a5de CH |
277 | blk_cleanup_queue(ctrl->ctrl.admin_q); |
278 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
3a85a5de CH |
279 | } |
280 | ||
281 | static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) | |
282 | { | |
283 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); | |
284 | ||
285 | if (list_empty(&ctrl->list)) | |
286 | goto free_ctrl; | |
287 | ||
288 | mutex_lock(&nvme_loop_ctrl_mutex); | |
289 | list_del(&ctrl->list); | |
290 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
291 | ||
292 | if (nctrl->tagset) { | |
293 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
294 | blk_mq_free_tag_set(&ctrl->tag_set); | |
295 | } | |
296 | kfree(ctrl->queues); | |
297 | nvmf_free_options(nctrl->opts); | |
298 | free_ctrl: | |
299 | kfree(ctrl); | |
300 | } | |
301 | ||
945dd5ba SG |
302 | static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) |
303 | { | |
304 | int i; | |
305 | ||
9d7fab04 SG |
306 | for (i = 1; i < ctrl->ctrl.queue_count; i++) { |
307 | clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); | |
945dd5ba | 308 | nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); |
9d7fab04 | 309 | } |
945dd5ba SG |
310 | } |
311 | ||
312 | static 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 | ||
d858e5f0 | 331 | ctrl->ctrl.queue_count++; |
945dd5ba SG |
332 | } |
333 | ||
334 | return 0; | |
335 | ||
336 | out_destroy_queues: | |
337 | nvme_loop_destroy_io_queues(ctrl); | |
338 | return ret; | |
339 | } | |
340 | ||
297186d6 SG |
341 | static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) |
342 | { | |
343 | int i, ret; | |
344 | ||
d858e5f0 | 345 | for (i = 1; i < ctrl->ctrl.queue_count; i++) { |
297186d6 SG |
346 | ret = nvmf_connect_io_queue(&ctrl->ctrl, i); |
347 | if (ret) | |
348 | return ret; | |
9d7fab04 | 349 | set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); |
297186d6 SG |
350 | } |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
3a85a5de CH |
355 | static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) |
356 | { | |
357 | int error; | |
358 | ||
359 | memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); | |
360 | ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; | |
38dabe21 | 361 | ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; |
3a85a5de CH |
362 | ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ |
363 | ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; | |
364 | ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + | |
365 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
366 | ctrl->admin_tag_set.driver_data = ctrl; | |
367 | ctrl->admin_tag_set.nr_hw_queues = 1; | |
368 | ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; | |
86f36b9c | 369 | ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; |
3a85a5de CH |
370 | |
371 | ctrl->queues[0].ctrl = ctrl; | |
372 | error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); | |
373 | if (error) | |
374 | return error; | |
d858e5f0 | 375 | ctrl->ctrl.queue_count = 1; |
3a85a5de CH |
376 | |
377 | error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); | |
378 | if (error) | |
379 | goto out_free_sq; | |
34b6c231 | 380 | ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; |
3a85a5de CH |
381 | |
382 | ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); | |
383 | if (IS_ERR(ctrl->ctrl.admin_q)) { | |
384 | error = PTR_ERR(ctrl->ctrl.admin_q); | |
385 | goto out_free_tagset; | |
386 | } | |
387 | ||
388 | error = nvmf_connect_admin_queue(&ctrl->ctrl); | |
389 | if (error) | |
390 | goto out_cleanup_queue; | |
391 | ||
9d7fab04 SG |
392 | set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); |
393 | ||
20d0dfe6 | 394 | error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); |
3a85a5de CH |
395 | if (error) { |
396 | dev_err(ctrl->ctrl.device, | |
397 | "prop_get NVME_REG_CAP failed\n"); | |
398 | goto out_cleanup_queue; | |
399 | } | |
400 | ||
401 | ctrl->ctrl.sqsize = | |
20d0dfe6 | 402 | min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); |
3a85a5de | 403 | |
20d0dfe6 | 404 | error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); |
3a85a5de CH |
405 | if (error) |
406 | goto out_cleanup_queue; | |
407 | ||
408 | ctrl->ctrl.max_hw_sectors = | |
409 | (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); | |
410 | ||
411 | error = nvme_init_identify(&ctrl->ctrl); | |
412 | if (error) | |
413 | goto out_cleanup_queue; | |
414 | ||
3a85a5de CH |
415 | return 0; |
416 | ||
417 | out_cleanup_queue: | |
418 | blk_cleanup_queue(ctrl->ctrl.admin_q); | |
419 | out_free_tagset: | |
420 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
421 | out_free_sq: | |
422 | nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); | |
423 | return error; | |
424 | } | |
425 | ||
426 | static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) | |
427 | { | |
d858e5f0 | 428 | if (ctrl->ctrl.queue_count > 1) { |
3a85a5de CH |
429 | nvme_stop_queues(&ctrl->ctrl); |
430 | blk_mq_tagset_busy_iter(&ctrl->tag_set, | |
431 | nvme_cancel_request, &ctrl->ctrl); | |
945dd5ba | 432 | nvme_loop_destroy_io_queues(ctrl); |
3a85a5de CH |
433 | } |
434 | ||
435 | if (ctrl->ctrl.state == NVME_CTRL_LIVE) | |
436 | nvme_shutdown_ctrl(&ctrl->ctrl); | |
437 | ||
c1c0ffff | 438 | blk_mq_quiesce_queue(ctrl->ctrl.admin_q); |
3a85a5de CH |
439 | blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, |
440 | nvme_cancel_request, &ctrl->ctrl); | |
c1c0ffff | 441 | blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); |
3a85a5de CH |
442 | nvme_loop_destroy_admin_queue(ctrl); |
443 | } | |
444 | ||
c5017e85 | 445 | static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) |
3a85a5de | 446 | { |
c5017e85 | 447 | nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); |
3a85a5de CH |
448 | } |
449 | ||
450 | static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) | |
451 | { | |
452 | struct nvme_loop_ctrl *ctrl; | |
453 | ||
454 | mutex_lock(&nvme_loop_ctrl_mutex); | |
455 | list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { | |
456 | if (ctrl->ctrl.cntlid == nctrl->cntlid) | |
c5017e85 | 457 | nvme_delete_ctrl(&ctrl->ctrl); |
3a85a5de CH |
458 | } |
459 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
460 | } | |
461 | ||
462 | static void nvme_loop_reset_ctrl_work(struct work_struct *work) | |
463 | { | |
d86c4d8e CH |
464 | struct nvme_loop_ctrl *ctrl = |
465 | container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); | |
3a85a5de | 466 | bool changed; |
297186d6 | 467 | int ret; |
3a85a5de | 468 | |
d09f2b45 | 469 | nvme_stop_ctrl(&ctrl->ctrl); |
3a85a5de CH |
470 | nvme_loop_shutdown_ctrl(ctrl); |
471 | ||
8bfc3b4c JT |
472 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { |
473 | /* state change failure should never happen */ | |
474 | WARN_ON_ONCE(1); | |
475 | return; | |
476 | } | |
477 | ||
3a85a5de CH |
478 | ret = nvme_loop_configure_admin_queue(ctrl); |
479 | if (ret) | |
480 | goto out_disable; | |
481 | ||
945dd5ba SG |
482 | ret = nvme_loop_init_io_queues(ctrl); |
483 | if (ret) | |
484 | goto out_destroy_admin; | |
3a85a5de | 485 | |
297186d6 SG |
486 | ret = nvme_loop_connect_io_queues(ctrl); |
487 | if (ret) | |
488 | goto out_destroy_io; | |
3a85a5de | 489 | |
4368c39b SG |
490 | blk_mq_update_nr_hw_queues(&ctrl->tag_set, |
491 | ctrl->ctrl.queue_count - 1); | |
492 | ||
3a85a5de CH |
493 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); |
494 | WARN_ON_ONCE(!changed); | |
495 | ||
d09f2b45 | 496 | nvme_start_ctrl(&ctrl->ctrl); |
3a85a5de CH |
497 | |
498 | return; | |
499 | ||
945dd5ba SG |
500 | out_destroy_io: |
501 | nvme_loop_destroy_io_queues(ctrl); | |
502 | out_destroy_admin: | |
3a85a5de CH |
503 | nvme_loop_destroy_admin_queue(ctrl); |
504 | out_disable: | |
505 | dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); | |
3a85a5de CH |
506 | nvme_uninit_ctrl(&ctrl->ctrl); |
507 | nvme_put_ctrl(&ctrl->ctrl); | |
508 | } | |
509 | ||
3a85a5de CH |
510 | static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { |
511 | .name = "loop", | |
512 | .module = THIS_MODULE, | |
d3d5b87d | 513 | .flags = NVME_F_FABRICS, |
3a85a5de CH |
514 | .reg_read32 = nvmf_reg_read32, |
515 | .reg_read64 = nvmf_reg_read64, | |
516 | .reg_write32 = nvmf_reg_write32, | |
3a85a5de CH |
517 | .free_ctrl = nvme_loop_free_ctrl, |
518 | .submit_async_event = nvme_loop_submit_async_event, | |
c5017e85 | 519 | .delete_ctrl = nvme_loop_delete_ctrl_host, |
3a85a5de CH |
520 | }; |
521 | ||
522 | static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) | |
523 | { | |
297186d6 | 524 | int ret; |
3a85a5de | 525 | |
945dd5ba SG |
526 | ret = nvme_loop_init_io_queues(ctrl); |
527 | if (ret) | |
3a85a5de CH |
528 | return ret; |
529 | ||
3a85a5de CH |
530 | memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); |
531 | ctrl->tag_set.ops = &nvme_loop_mq_ops; | |
eadb7cf4 | 532 | ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; |
3a85a5de CH |
533 | ctrl->tag_set.reserved_tags = 1; /* fabric connect */ |
534 | ctrl->tag_set.numa_node = NUMA_NO_NODE; | |
535 | ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
536 | ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + | |
537 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
538 | ctrl->tag_set.driver_data = ctrl; | |
d858e5f0 | 539 | ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; |
3a85a5de CH |
540 | ctrl->tag_set.timeout = NVME_IO_TIMEOUT; |
541 | ctrl->ctrl.tagset = &ctrl->tag_set; | |
542 | ||
543 | ret = blk_mq_alloc_tag_set(&ctrl->tag_set); | |
544 | if (ret) | |
545 | goto out_destroy_queues; | |
546 | ||
547 | ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); | |
548 | if (IS_ERR(ctrl->ctrl.connect_q)) { | |
549 | ret = PTR_ERR(ctrl->ctrl.connect_q); | |
550 | goto out_free_tagset; | |
551 | } | |
552 | ||
297186d6 SG |
553 | ret = nvme_loop_connect_io_queues(ctrl); |
554 | if (ret) | |
555 | goto out_cleanup_connect_q; | |
3a85a5de CH |
556 | |
557 | return 0; | |
558 | ||
559 | out_cleanup_connect_q: | |
560 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
561 | out_free_tagset: | |
562 | blk_mq_free_tag_set(&ctrl->tag_set); | |
563 | out_destroy_queues: | |
945dd5ba | 564 | nvme_loop_destroy_io_queues(ctrl); |
3a85a5de CH |
565 | return ret; |
566 | } | |
567 | ||
568 | static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, | |
569 | struct nvmf_ctrl_options *opts) | |
570 | { | |
571 | struct nvme_loop_ctrl *ctrl; | |
572 | bool changed; | |
573 | int ret; | |
574 | ||
575 | ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); | |
576 | if (!ctrl) | |
577 | return ERR_PTR(-ENOMEM); | |
578 | ctrl->ctrl.opts = opts; | |
579 | INIT_LIST_HEAD(&ctrl->list); | |
580 | ||
d86c4d8e | 581 | INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); |
3a85a5de CH |
582 | |
583 | ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, | |
584 | 0 /* no quirks, we're perfect! */); | |
585 | if (ret) | |
586 | goto out_put_ctrl; | |
587 | ||
3a85a5de CH |
588 | ret = -ENOMEM; |
589 | ||
eadb7cf4 | 590 | ctrl->ctrl.sqsize = opts->queue_size - 1; |
3a85a5de CH |
591 | ctrl->ctrl.kato = opts->kato; |
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 | /* warn if maxcmd is lower than queue_size */ | |
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 | ||
d22524a4 | 621 | nvme_get_ctrl(&ctrl->ctrl); |
3a85a5de CH |
622 | |
623 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
624 | WARN_ON_ONCE(!changed); | |
625 | ||
626 | mutex_lock(&nvme_loop_ctrl_mutex); | |
627 | list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); | |
628 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
629 | ||
d09f2b45 | 630 | nvme_start_ctrl(&ctrl->ctrl); |
3a85a5de CH |
631 | |
632 | return &ctrl->ctrl; | |
633 | ||
634 | out_remove_admin_queue: | |
635 | nvme_loop_destroy_admin_queue(ctrl); | |
636 | out_free_queues: | |
637 | kfree(ctrl->queues); | |
638 | out_uninit_ctrl: | |
639 | nvme_uninit_ctrl(&ctrl->ctrl); | |
640 | out_put_ctrl: | |
641 | nvme_put_ctrl(&ctrl->ctrl); | |
642 | if (ret > 0) | |
643 | ret = -EIO; | |
644 | return ERR_PTR(ret); | |
645 | } | |
646 | ||
647 | static int nvme_loop_add_port(struct nvmet_port *port) | |
648 | { | |
649 | /* | |
650 | * XXX: disalow adding more than one port so | |
651 | * there is no connection rejections when a | |
652 | * a subsystem is assigned to a port for which | |
653 | * loop doesn't have a pointer. | |
654 | * This scenario would be possible if we allowed | |
655 | * more than one port to be added and a subsystem | |
656 | * was assigned to a port other than nvmet_loop_port. | |
657 | */ | |
658 | ||
659 | if (nvmet_loop_port) | |
660 | return -EPERM; | |
661 | ||
662 | nvmet_loop_port = port; | |
663 | return 0; | |
664 | } | |
665 | ||
666 | static void nvme_loop_remove_port(struct nvmet_port *port) | |
667 | { | |
668 | if (port == nvmet_loop_port) | |
669 | nvmet_loop_port = NULL; | |
670 | } | |
671 | ||
e929f06d | 672 | static const struct nvmet_fabrics_ops nvme_loop_ops = { |
3a85a5de CH |
673 | .owner = THIS_MODULE, |
674 | .type = NVMF_TRTYPE_LOOP, | |
675 | .add_port = nvme_loop_add_port, | |
676 | .remove_port = nvme_loop_remove_port, | |
677 | .queue_response = nvme_loop_queue_response, | |
678 | .delete_ctrl = nvme_loop_delete_ctrl, | |
679 | }; | |
680 | ||
681 | static struct nvmf_transport_ops nvme_loop_transport = { | |
682 | .name = "loop", | |
0de5cd36 | 683 | .module = THIS_MODULE, |
3a85a5de CH |
684 | .create_ctrl = nvme_loop_create_ctrl, |
685 | }; | |
686 | ||
687 | static int __init nvme_loop_init_module(void) | |
688 | { | |
689 | int ret; | |
690 | ||
691 | ret = nvmet_register_transport(&nvme_loop_ops); | |
692 | if (ret) | |
693 | return ret; | |
d19eef02 SG |
694 | |
695 | ret = nvmf_register_transport(&nvme_loop_transport); | |
696 | if (ret) | |
697 | nvmet_unregister_transport(&nvme_loop_ops); | |
698 | ||
699 | return ret; | |
3a85a5de CH |
700 | } |
701 | ||
702 | static void __exit nvme_loop_cleanup_module(void) | |
703 | { | |
704 | struct nvme_loop_ctrl *ctrl, *next; | |
705 | ||
706 | nvmf_unregister_transport(&nvme_loop_transport); | |
707 | nvmet_unregister_transport(&nvme_loop_ops); | |
708 | ||
709 | mutex_lock(&nvme_loop_ctrl_mutex); | |
710 | list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) | |
c5017e85 | 711 | nvme_delete_ctrl(&ctrl->ctrl); |
3a85a5de CH |
712 | mutex_unlock(&nvme_loop_ctrl_mutex); |
713 | ||
b227c59b | 714 | flush_workqueue(nvme_delete_wq); |
3a85a5de CH |
715 | } |
716 | ||
717 | module_init(nvme_loop_init_module); | |
718 | module_exit(nvme_loop_cleanup_module); | |
719 | ||
720 | MODULE_LICENSE("GPL v2"); | |
721 | MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ |