Commit | Line | Data |
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d0ad6904 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3a85a5de CH |
2 | /* |
3 | * NVMe over Fabrics loopback device. | |
4 | * Copyright (c) 2015-2016 HGST, a Western Digital Company. | |
3a85a5de CH |
5 | */ |
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
7 | #include <linux/scatterlist.h> | |
3a85a5de CH |
8 | #include <linux/blk-mq.h> |
9 | #include <linux/nvme.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/parser.h> | |
3a85a5de CH |
12 | #include "nvmet.h" |
13 | #include "../host/nvme.h" | |
14 | #include "../host/fabrics.h" | |
15 | ||
3a85a5de CH |
16 | #define NVME_LOOP_MAX_SEGMENTS 256 |
17 | ||
3a85a5de | 18 | struct nvme_loop_iod { |
d49187e9 | 19 | struct nvme_request nvme_req; |
3a85a5de | 20 | struct nvme_command cmd; |
fc6c9730 | 21 | struct nvme_completion cqe; |
3a85a5de CH |
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 { | |
3a85a5de | 30 | struct nvme_loop_queue *queues; |
3a85a5de CH |
31 | |
32 | struct blk_mq_tag_set admin_tag_set; | |
33 | ||
34 | struct list_head list; | |
3a85a5de CH |
35 | struct blk_mq_tag_set tag_set; |
36 | struct nvme_loop_iod async_event_iod; | |
37 | struct nvme_ctrl ctrl; | |
38 | ||
fe4a9791 | 39 | struct nvmet_port *port; |
3a85a5de CH |
40 | }; |
41 | ||
42 | static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) | |
43 | { | |
44 | return container_of(ctrl, struct nvme_loop_ctrl, ctrl); | |
45 | } | |
46 | ||
9d7fab04 SG |
47 | enum nvme_loop_queue_flags { |
48 | NVME_LOOP_Q_LIVE = 0, | |
49 | }; | |
50 | ||
3a85a5de CH |
51 | struct nvme_loop_queue { |
52 | struct nvmet_cq nvme_cq; | |
53 | struct nvmet_sq nvme_sq; | |
54 | struct nvme_loop_ctrl *ctrl; | |
9d7fab04 | 55 | unsigned long flags; |
3a85a5de CH |
56 | }; |
57 | ||
fe4a9791 CH |
58 | static LIST_HEAD(nvme_loop_ports); |
59 | static DEFINE_MUTEX(nvme_loop_ports_mutex); | |
3a85a5de CH |
60 | |
61 | static LIST_HEAD(nvme_loop_ctrl_list); | |
62 | static DEFINE_MUTEX(nvme_loop_ctrl_mutex); | |
63 | ||
64 | static void nvme_loop_queue_response(struct nvmet_req *nvme_req); | |
65 | static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); | |
66 | ||
e929f06d | 67 | static const struct nvmet_fabrics_ops nvme_loop_ops; |
3a85a5de CH |
68 | |
69 | static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) | |
70 | { | |
71 | return queue - queue->ctrl->queues; | |
72 | } | |
73 | ||
74 | static void nvme_loop_complete_rq(struct request *req) | |
75 | { | |
76 | struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); | |
3a85a5de | 77 | |
52e6d8ed | 78 | sg_free_table_chained(&iod->sg_table, NVME_INLINE_SG_CNT); |
77f02a7a | 79 | nvme_complete_rq(req); |
3a85a5de | 80 | } |
3a85a5de | 81 | |
3b068376 SG |
82 | static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) |
83 | { | |
84 | u32 queue_idx = nvme_loop_queue_idx(queue); | |
3a85a5de | 85 | |
3b068376 SG |
86 | if (queue_idx == 0) |
87 | return queue->ctrl->admin_tag_set.tags[queue_idx]; | |
88 | return queue->ctrl->tag_set.tags[queue_idx - 1]; | |
3a85a5de CH |
89 | } |
90 | ||
d49187e9 | 91 | static void nvme_loop_queue_response(struct nvmet_req *req) |
3a85a5de | 92 | { |
3b068376 SG |
93 | struct nvme_loop_queue *queue = |
94 | container_of(req->sq, struct nvme_loop_queue, nvme_sq); | |
fc6c9730 | 95 | struct nvme_completion *cqe = req->cqe; |
3a85a5de CH |
96 | |
97 | /* | |
98 | * AEN requests are special as they don't time out and can | |
99 | * survive any kind of queue freeze and often don't respond to | |
100 | * aborts. We don't even bother to allocate a struct request | |
101 | * for them but rather special case them here. | |
102 | */ | |
58a8df67 IR |
103 | if (unlikely(nvme_is_aen_req(nvme_loop_queue_idx(queue), |
104 | cqe->command_id))) { | |
3b068376 | 105 | nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, |
7bf58533 | 106 | &cqe->result); |
3a85a5de | 107 | } else { |
3b068376 | 108 | struct request *rq; |
3b068376 | 109 | |
e7006de6 | 110 | rq = nvme_find_rq(nvme_loop_tagset(queue), cqe->command_id); |
3b068376 SG |
111 | if (!rq) { |
112 | dev_err(queue->ctrl->ctrl.device, | |
e7006de6 | 113 | "got bad command_id %#x on queue %d\n", |
3b068376 SG |
114 | cqe->command_id, nvme_loop_queue_idx(queue)); |
115 | return; | |
116 | } | |
3a85a5de | 117 | |
2eb81a33 | 118 | if (!nvme_try_complete_req(rq, cqe->status, cqe->result)) |
ff029451 | 119 | nvme_loop_complete_rq(rq); |
3a85a5de CH |
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 | ||
be3f3114 | 128 | iod->req.execute(&iod->req); |
3a85a5de CH |
129 | } |
130 | ||
fc17b653 | 131 | static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, |
3a85a5de CH |
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); | |
3bc32bb1 | 138 | bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags); |
fc17b653 | 139 | blk_status_t ret; |
3a85a5de | 140 | |
a9715744 TC |
141 | if (!nvme_check_ready(&queue->ctrl->ctrl, req, queue_ready)) |
142 | return nvme_fail_nonready_command(&queue->ctrl->ctrl, req); | |
9d7fab04 | 143 | |
f4b9e6c9 | 144 | ret = nvme_setup_cmd(ns, req); |
fc17b653 | 145 | if (ret) |
3a85a5de CH |
146 | return ret; |
147 | ||
6887fc64 | 148 | nvme_start_request(req); |
3a85a5de | 149 | iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; |
fe4a9791 | 150 | iod->req.port = queue->ctrl->port; |
3a85a5de | 151 | if (!nvmet_req_init(&iod->req, &queue->nvme_cq, |
11d9ea6f | 152 | &queue->nvme_sq, &nvme_loop_ops)) |
fc17b653 | 153 | return BLK_STS_OK; |
3a85a5de | 154 | |
eb464833 | 155 | if (blk_rq_nr_phys_segments(req)) { |
3a85a5de | 156 | iod->sg_table.sgl = iod->first_sgl; |
fc17b653 | 157 | if (sg_alloc_table_chained(&iod->sg_table, |
f9d03f96 | 158 | blk_rq_nr_phys_segments(req), |
52e6d8ed | 159 | iod->sg_table.sgl, NVME_INLINE_SG_CNT)) { |
5812d04c | 160 | nvme_cleanup_cmd(req); |
fc17b653 | 161 | return BLK_STS_RESOURCE; |
5812d04c | 162 | } |
3a85a5de CH |
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); | |
796b0b8d | 166 | iod->req.transfer_len = blk_rq_payload_bytes(req); |
3a85a5de CH |
167 | } |
168 | ||
8832cf92 | 169 | queue_work(nvmet_wq, &iod->work); |
fc17b653 | 170 | return BLK_STS_OK; |
3a85a5de CH |
171 | } |
172 | ||
ad22c355 | 173 | static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) |
3a85a5de CH |
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; | |
38dabe21 | 181 | iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; |
3a85a5de CH |
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 | ||
8832cf92 | 190 | queue_work(nvmet_wq, &iod->work); |
3a85a5de CH |
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 | { | |
3a85a5de | 196 | iod->req.cmd = &iod->cmd; |
fc6c9730 | 197 | iod->req.cqe = &iod->cqe; |
3a85a5de CH |
198 | iod->queue = &ctrl->queues[queue_idx]; |
199 | INIT_WORK(&iod->work, nvme_loop_execute_work); | |
200 | return 0; | |
201 | } | |
202 | ||
d6296d39 CH |
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) | |
3a85a5de | 206 | { |
2ade8221 | 207 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(set->driver_data); |
f4b9e6c9 | 208 | struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); |
3a85a5de | 209 | |
59e29ce6 | 210 | nvme_req(req)->ctrl = &ctrl->ctrl; |
f4b9e6c9 | 211 | nvme_req(req)->cmd = &iod->cmd; |
62b83b18 CH |
212 | return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), |
213 | (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); | |
3a85a5de CH |
214 | } |
215 | ||
88c99793 ML |
216 | static struct lock_class_key loop_hctx_fq_lock_key; |
217 | ||
3a85a5de CH |
218 | static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
219 | unsigned int hctx_idx) | |
220 | { | |
2ade8221 | 221 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(data); |
3a85a5de CH |
222 | struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; |
223 | ||
d858e5f0 | 224 | BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); |
3a85a5de | 225 | |
88c99793 ML |
226 | /* |
227 | * flush_end_io() can be called recursively for us, so use our own | |
228 | * lock class key for avoiding lockdep possible recursive locking, | |
229 | * then we can remove the dynamically allocated lock class for each | |
230 | * flush queue, that way may cause horrible boot delay. | |
231 | */ | |
232 | blk_mq_hctx_set_fq_lock_class(hctx, &loop_hctx_fq_lock_key); | |
233 | ||
3a85a5de CH |
234 | hctx->driver_data = queue; |
235 | return 0; | |
236 | } | |
237 | ||
238 | static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
239 | unsigned int hctx_idx) | |
240 | { | |
2ade8221 | 241 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(data); |
3a85a5de CH |
242 | struct nvme_loop_queue *queue = &ctrl->queues[0]; |
243 | ||
244 | BUG_ON(hctx_idx != 0); | |
245 | ||
246 | hctx->driver_data = queue; | |
247 | return 0; | |
248 | } | |
249 | ||
f363b089 | 250 | static const struct blk_mq_ops nvme_loop_mq_ops = { |
3a85a5de CH |
251 | .queue_rq = nvme_loop_queue_rq, |
252 | .complete = nvme_loop_complete_rq, | |
3a85a5de CH |
253 | .init_request = nvme_loop_init_request, |
254 | .init_hctx = nvme_loop_init_hctx, | |
3a85a5de CH |
255 | }; |
256 | ||
f363b089 | 257 | static const struct blk_mq_ops nvme_loop_admin_mq_ops = { |
3a85a5de CH |
258 | .queue_rq = nvme_loop_queue_rq, |
259 | .complete = nvme_loop_complete_rq, | |
62b83b18 | 260 | .init_request = nvme_loop_init_request, |
3a85a5de | 261 | .init_hctx = nvme_loop_init_admin_hctx, |
3a85a5de CH |
262 | }; |
263 | ||
264 | static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) | |
265 | { | |
4237de2f HR |
266 | if (!test_and_clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags)) |
267 | return; | |
e4c5d376 | 268 | nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); |
ceee1953 | 269 | nvme_remove_admin_tag_set(&ctrl->ctrl); |
3a85a5de CH |
270 | } |
271 | ||
272 | static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) | |
273 | { | |
274 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); | |
275 | ||
276 | if (list_empty(&ctrl->list)) | |
277 | goto free_ctrl; | |
278 | ||
279 | mutex_lock(&nvme_loop_ctrl_mutex); | |
280 | list_del(&ctrl->list); | |
281 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
282 | ||
ceee1953 CH |
283 | if (nctrl->tagset) |
284 | nvme_remove_io_tag_set(nctrl); | |
3a85a5de CH |
285 | kfree(ctrl->queues); |
286 | nvmf_free_options(nctrl->opts); | |
287 | free_ctrl: | |
288 | kfree(ctrl); | |
289 | } | |
290 | ||
945dd5ba SG |
291 | static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) |
292 | { | |
293 | int i; | |
294 | ||
9d7fab04 SG |
295 | for (i = 1; i < ctrl->ctrl.queue_count; i++) { |
296 | clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); | |
945dd5ba | 297 | nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); |
9d7fab04 | 298 | } |
a6c144f3 | 299 | ctrl->ctrl.queue_count = 1; |
945dd5ba SG |
300 | } |
301 | ||
302 | static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) | |
303 | { | |
304 | struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; | |
305 | unsigned int nr_io_queues; | |
306 | int ret, i; | |
307 | ||
308 | nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); | |
309 | ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); | |
310 | if (ret || !nr_io_queues) | |
311 | return ret; | |
312 | ||
313 | dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); | |
314 | ||
315 | for (i = 1; i <= nr_io_queues; i++) { | |
316 | ctrl->queues[i].ctrl = ctrl; | |
317 | ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); | |
318 | if (ret) | |
319 | goto out_destroy_queues; | |
320 | ||
d858e5f0 | 321 | ctrl->ctrl.queue_count++; |
945dd5ba SG |
322 | } |
323 | ||
324 | return 0; | |
325 | ||
326 | out_destroy_queues: | |
327 | nvme_loop_destroy_io_queues(ctrl); | |
328 | return ret; | |
329 | } | |
330 | ||
297186d6 SG |
331 | static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) |
332 | { | |
333 | int i, ret; | |
334 | ||
d858e5f0 | 335 | for (i = 1; i < ctrl->ctrl.queue_count; i++) { |
be42a33b | 336 | ret = nvmf_connect_io_queue(&ctrl->ctrl, i); |
297186d6 SG |
337 | if (ret) |
338 | return ret; | |
9d7fab04 | 339 | set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); |
297186d6 SG |
340 | } |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
3a85a5de CH |
345 | static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) |
346 | { | |
347 | int error; | |
348 | ||
3a85a5de CH |
349 | ctrl->queues[0].ctrl = ctrl; |
350 | error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); | |
351 | if (error) | |
352 | return error; | |
d858e5f0 | 353 | ctrl->ctrl.queue_count = 1; |
3a85a5de | 354 | |
ceee1953 | 355 | error = nvme_alloc_admin_tag_set(&ctrl->ctrl, &ctrl->admin_tag_set, |
db45e1a5 | 356 | &nvme_loop_admin_mq_ops, |
ceee1953 CH |
357 | sizeof(struct nvme_loop_iod) + |
358 | NVME_INLINE_SG_CNT * sizeof(struct scatterlist)); | |
3a85a5de CH |
359 | if (error) |
360 | goto out_free_sq; | |
e7832cb4 | 361 | |
1d35d519 ML |
362 | /* reset stopped state for the fresh admin queue */ |
363 | clear_bit(NVME_CTRL_ADMIN_Q_STOPPED, &ctrl->ctrl.flags); | |
3a85a5de CH |
364 | |
365 | error = nvmf_connect_admin_queue(&ctrl->ctrl); | |
366 | if (error) | |
ceee1953 | 367 | goto out_cleanup_tagset; |
3a85a5de | 368 | |
9d7fab04 SG |
369 | set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); |
370 | ||
c0f2f45b | 371 | error = nvme_enable_ctrl(&ctrl->ctrl); |
3a85a5de | 372 | if (error) |
ceee1953 | 373 | goto out_cleanup_tagset; |
3a85a5de CH |
374 | |
375 | ctrl->ctrl.max_hw_sectors = | |
9bcf156f | 376 | (NVME_LOOP_MAX_SEGMENTS - 1) << PAGE_SECTORS_SHIFT; |
3a85a5de | 377 | |
9f27bd70 | 378 | nvme_unquiesce_admin_queue(&ctrl->ctrl); |
e7832cb4 | 379 | |
94cc781f | 380 | error = nvme_init_ctrl_finish(&ctrl->ctrl, false); |
3a85a5de | 381 | if (error) |
ceee1953 | 382 | goto out_cleanup_tagset; |
3a85a5de | 383 | |
3a85a5de CH |
384 | return 0; |
385 | ||
ceee1953 | 386 | out_cleanup_tagset: |
1c5f8e88 | 387 | clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); |
ceee1953 | 388 | nvme_remove_admin_tag_set(&ctrl->ctrl); |
3a85a5de CH |
389 | out_free_sq: |
390 | nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); | |
391 | return error; | |
392 | } | |
393 | ||
394 | static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) | |
395 | { | |
d858e5f0 | 396 | if (ctrl->ctrl.queue_count > 1) { |
9f27bd70 | 397 | nvme_quiesce_io_queues(&ctrl->ctrl); |
e41f8c02 | 398 | nvme_cancel_tagset(&ctrl->ctrl); |
945dd5ba | 399 | nvme_loop_destroy_io_queues(ctrl); |
3a85a5de CH |
400 | } |
401 | ||
9f27bd70 | 402 | nvme_quiesce_admin_queue(&ctrl->ctrl); |
6d3c7fb1 | 403 | if (nvme_ctrl_state(&ctrl->ctrl) == NVME_CTRL_LIVE) |
285b6e9b | 404 | nvme_disable_ctrl(&ctrl->ctrl, true); |
3a85a5de | 405 | |
e41f8c02 | 406 | nvme_cancel_admin_tagset(&ctrl->ctrl); |
3a85a5de CH |
407 | nvme_loop_destroy_admin_queue(ctrl); |
408 | } | |
409 | ||
c5017e85 | 410 | static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) |
3a85a5de | 411 | { |
c5017e85 | 412 | nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); |
3a85a5de CH |
413 | } |
414 | ||
415 | static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) | |
416 | { | |
417 | struct nvme_loop_ctrl *ctrl; | |
418 | ||
419 | mutex_lock(&nvme_loop_ctrl_mutex); | |
420 | list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { | |
421 | if (ctrl->ctrl.cntlid == nctrl->cntlid) | |
c5017e85 | 422 | nvme_delete_ctrl(&ctrl->ctrl); |
3a85a5de CH |
423 | } |
424 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
425 | } | |
426 | ||
427 | static void nvme_loop_reset_ctrl_work(struct work_struct *work) | |
428 | { | |
d86c4d8e CH |
429 | struct nvme_loop_ctrl *ctrl = |
430 | container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); | |
297186d6 | 431 | int ret; |
3a85a5de | 432 | |
d09f2b45 | 433 | nvme_stop_ctrl(&ctrl->ctrl); |
3a85a5de CH |
434 | nvme_loop_shutdown_ctrl(ctrl); |
435 | ||
8bfc3b4c | 436 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { |
6d3c7fb1 KB |
437 | enum nvme_ctrl_state state = nvme_ctrl_state(&ctrl->ctrl); |
438 | ||
439 | if (state != NVME_CTRL_DELETING && | |
440 | state != NVME_CTRL_DELETING_NOIO) | |
6622f9ac HR |
441 | /* state change failure for non-deleted ctrl? */ |
442 | WARN_ON_ONCE(1); | |
8bfc3b4c JT |
443 | return; |
444 | } | |
445 | ||
3a85a5de CH |
446 | ret = nvme_loop_configure_admin_queue(ctrl); |
447 | if (ret) | |
448 | goto out_disable; | |
449 | ||
945dd5ba SG |
450 | ret = nvme_loop_init_io_queues(ctrl); |
451 | if (ret) | |
452 | goto out_destroy_admin; | |
3a85a5de | 453 | |
297186d6 SG |
454 | ret = nvme_loop_connect_io_queues(ctrl); |
455 | if (ret) | |
456 | goto out_destroy_io; | |
3a85a5de | 457 | |
4368c39b SG |
458 | blk_mq_update_nr_hw_queues(&ctrl->tag_set, |
459 | ctrl->ctrl.queue_count - 1); | |
460 | ||
b6cec06d CK |
461 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE)) |
462 | WARN_ON_ONCE(1); | |
3a85a5de | 463 | |
d09f2b45 | 464 | nvme_start_ctrl(&ctrl->ctrl); |
3a85a5de CH |
465 | |
466 | return; | |
467 | ||
945dd5ba SG |
468 | out_destroy_io: |
469 | nvme_loop_destroy_io_queues(ctrl); | |
470 | out_destroy_admin: | |
55adcdbb HR |
471 | nvme_quiesce_admin_queue(&ctrl->ctrl); |
472 | nvme_cancel_admin_tagset(&ctrl->ctrl); | |
3a85a5de CH |
473 | nvme_loop_destroy_admin_queue(ctrl); |
474 | out_disable: | |
475 | dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); | |
3a85a5de | 476 | nvme_uninit_ctrl(&ctrl->ctrl); |
3a85a5de CH |
477 | } |
478 | ||
3a85a5de CH |
479 | static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { |
480 | .name = "loop", | |
481 | .module = THIS_MODULE, | |
d3d5b87d | 482 | .flags = NVME_F_FABRICS, |
3a85a5de CH |
483 | .reg_read32 = nvmf_reg_read32, |
484 | .reg_read64 = nvmf_reg_read64, | |
485 | .reg_write32 = nvmf_reg_write32, | |
3a85a5de CH |
486 | .free_ctrl = nvme_loop_free_ctrl, |
487 | .submit_async_event = nvme_loop_submit_async_event, | |
c5017e85 | 488 | .delete_ctrl = nvme_loop_delete_ctrl_host, |
fe4a9791 | 489 | .get_address = nvmf_get_address, |
3a85a5de CH |
490 | }; |
491 | ||
492 | static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) | |
493 | { | |
297186d6 | 494 | int ret; |
3a85a5de | 495 | |
945dd5ba SG |
496 | ret = nvme_loop_init_io_queues(ctrl); |
497 | if (ret) | |
3a85a5de CH |
498 | return ret; |
499 | ||
ceee1953 | 500 | ret = nvme_alloc_io_tag_set(&ctrl->ctrl, &ctrl->tag_set, |
db45e1a5 | 501 | &nvme_loop_mq_ops, 1, |
ceee1953 CH |
502 | sizeof(struct nvme_loop_iod) + |
503 | NVME_INLINE_SG_CNT * sizeof(struct scatterlist)); | |
3a85a5de CH |
504 | if (ret) |
505 | goto out_destroy_queues; | |
506 | ||
297186d6 SG |
507 | ret = nvme_loop_connect_io_queues(ctrl); |
508 | if (ret) | |
ceee1953 | 509 | goto out_cleanup_tagset; |
3a85a5de CH |
510 | |
511 | return 0; | |
512 | ||
ceee1953 CH |
513 | out_cleanup_tagset: |
514 | nvme_remove_io_tag_set(&ctrl->ctrl); | |
3a85a5de | 515 | out_destroy_queues: |
945dd5ba | 516 | nvme_loop_destroy_io_queues(ctrl); |
3a85a5de CH |
517 | return ret; |
518 | } | |
519 | ||
fe4a9791 CH |
520 | static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) |
521 | { | |
522 | struct nvmet_port *p, *found = NULL; | |
523 | ||
524 | mutex_lock(&nvme_loop_ports_mutex); | |
525 | list_for_each_entry(p, &nvme_loop_ports, entry) { | |
526 | /* if no transport address is specified use the first port */ | |
527 | if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && | |
528 | strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) | |
529 | continue; | |
530 | found = p; | |
531 | break; | |
532 | } | |
533 | mutex_unlock(&nvme_loop_ports_mutex); | |
534 | return found; | |
535 | } | |
536 | ||
3a85a5de CH |
537 | static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, |
538 | struct nvmf_ctrl_options *opts) | |
539 | { | |
540 | struct nvme_loop_ctrl *ctrl; | |
3a85a5de CH |
541 | int ret; |
542 | ||
543 | ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); | |
544 | if (!ctrl) | |
545 | return ERR_PTR(-ENOMEM); | |
546 | ctrl->ctrl.opts = opts; | |
547 | INIT_LIST_HEAD(&ctrl->list); | |
548 | ||
d86c4d8e | 549 | INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); |
3a85a5de CH |
550 | |
551 | ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, | |
552 | 0 /* no quirks, we're perfect! */); | |
03504e3b WB |
553 | if (ret) { |
554 | kfree(ctrl); | |
1401fcc4 | 555 | goto out; |
03504e3b | 556 | } |
3a85a5de | 557 | |
b6cec06d CK |
558 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) |
559 | WARN_ON_ONCE(1); | |
64d452b3 | 560 | |
3a85a5de CH |
561 | ret = -ENOMEM; |
562 | ||
3a85a5de | 563 | ctrl->ctrl.kato = opts->kato; |
fe4a9791 | 564 | ctrl->port = nvme_loop_find_port(&ctrl->ctrl); |
3a85a5de CH |
565 | |
566 | ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), | |
567 | GFP_KERNEL); | |
568 | if (!ctrl->queues) | |
569 | goto out_uninit_ctrl; | |
570 | ||
571 | ret = nvme_loop_configure_admin_queue(ctrl); | |
572 | if (ret) | |
573 | goto out_free_queues; | |
574 | ||
575 | if (opts->queue_size > ctrl->ctrl.maxcmd) { | |
576 | /* warn if maxcmd is lower than queue_size */ | |
577 | dev_warn(ctrl->ctrl.device, | |
578 | "queue_size %zu > ctrl maxcmd %u, clamping down\n", | |
579 | opts->queue_size, ctrl->ctrl.maxcmd); | |
580 | opts->queue_size = ctrl->ctrl.maxcmd; | |
581 | } | |
379e0df5 | 582 | ctrl->ctrl.sqsize = opts->queue_size - 1; |
3a85a5de CH |
583 | |
584 | if (opts->nr_io_queues) { | |
585 | ret = nvme_loop_create_io_queues(ctrl); | |
586 | if (ret) | |
587 | goto out_remove_admin_queue; | |
588 | } | |
589 | ||
590 | nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); | |
591 | ||
592 | dev_info(ctrl->ctrl.device, | |
593 | "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); | |
594 | ||
b6cec06d CK |
595 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE)) |
596 | WARN_ON_ONCE(1); | |
3a85a5de CH |
597 | |
598 | mutex_lock(&nvme_loop_ctrl_mutex); | |
599 | list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); | |
600 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
601 | ||
d09f2b45 | 602 | nvme_start_ctrl(&ctrl->ctrl); |
3a85a5de CH |
603 | |
604 | return &ctrl->ctrl; | |
605 | ||
606 | out_remove_admin_queue: | |
55adcdbb HR |
607 | nvme_quiesce_admin_queue(&ctrl->ctrl); |
608 | nvme_cancel_admin_tagset(&ctrl->ctrl); | |
3a85a5de CH |
609 | nvme_loop_destroy_admin_queue(ctrl); |
610 | out_free_queues: | |
611 | kfree(ctrl->queues); | |
612 | out_uninit_ctrl: | |
613 | nvme_uninit_ctrl(&ctrl->ctrl); | |
3a85a5de | 614 | nvme_put_ctrl(&ctrl->ctrl); |
1401fcc4 | 615 | out: |
3a85a5de CH |
616 | if (ret > 0) |
617 | ret = -EIO; | |
618 | return ERR_PTR(ret); | |
619 | } | |
620 | ||
621 | static int nvme_loop_add_port(struct nvmet_port *port) | |
622 | { | |
fe4a9791 CH |
623 | mutex_lock(&nvme_loop_ports_mutex); |
624 | list_add_tail(&port->entry, &nvme_loop_ports); | |
625 | mutex_unlock(&nvme_loop_ports_mutex); | |
3a85a5de CH |
626 | return 0; |
627 | } | |
628 | ||
629 | static void nvme_loop_remove_port(struct nvmet_port *port) | |
630 | { | |
fe4a9791 CH |
631 | mutex_lock(&nvme_loop_ports_mutex); |
632 | list_del_init(&port->entry); | |
633 | mutex_unlock(&nvme_loop_ports_mutex); | |
86b9a63e LG |
634 | |
635 | /* | |
636 | * Ensure any ctrls that are in the process of being | |
637 | * deleted are in fact deleted before we return | |
638 | * and free the port. This is to prevent active | |
639 | * ctrls from using a port after it's freed. | |
640 | */ | |
641 | flush_workqueue(nvme_delete_wq); | |
3a85a5de CH |
642 | } |
643 | ||
e929f06d | 644 | static const struct nvmet_fabrics_ops nvme_loop_ops = { |
3a85a5de CH |
645 | .owner = THIS_MODULE, |
646 | .type = NVMF_TRTYPE_LOOP, | |
647 | .add_port = nvme_loop_add_port, | |
648 | .remove_port = nvme_loop_remove_port, | |
649 | .queue_response = nvme_loop_queue_response, | |
650 | .delete_ctrl = nvme_loop_delete_ctrl, | |
651 | }; | |
652 | ||
653 | static struct nvmf_transport_ops nvme_loop_transport = { | |
654 | .name = "loop", | |
0de5cd36 | 655 | .module = THIS_MODULE, |
3a85a5de | 656 | .create_ctrl = nvme_loop_create_ctrl, |
fe4a9791 | 657 | .allowed_opts = NVMF_OPT_TRADDR, |
3a85a5de CH |
658 | }; |
659 | ||
660 | static int __init nvme_loop_init_module(void) | |
661 | { | |
662 | int ret; | |
663 | ||
664 | ret = nvmet_register_transport(&nvme_loop_ops); | |
665 | if (ret) | |
666 | return ret; | |
d19eef02 SG |
667 | |
668 | ret = nvmf_register_transport(&nvme_loop_transport); | |
669 | if (ret) | |
670 | nvmet_unregister_transport(&nvme_loop_ops); | |
671 | ||
672 | return ret; | |
3a85a5de CH |
673 | } |
674 | ||
675 | static void __exit nvme_loop_cleanup_module(void) | |
676 | { | |
677 | struct nvme_loop_ctrl *ctrl, *next; | |
678 | ||
679 | nvmf_unregister_transport(&nvme_loop_transport); | |
680 | nvmet_unregister_transport(&nvme_loop_ops); | |
681 | ||
682 | mutex_lock(&nvme_loop_ctrl_mutex); | |
683 | list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) | |
c5017e85 | 684 | nvme_delete_ctrl(&ctrl->ctrl); |
3a85a5de CH |
685 | mutex_unlock(&nvme_loop_ctrl_mutex); |
686 | ||
b227c59b | 687 | flush_workqueue(nvme_delete_wq); |
3a85a5de CH |
688 | } |
689 | ||
690 | module_init(nvme_loop_init_module); | |
691 | module_exit(nvme_loop_cleanup_module); | |
692 | ||
41951f83 | 693 | MODULE_DESCRIPTION("NVMe target loop transport driver"); |
3a85a5de CH |
694 | MODULE_LICENSE("GPL v2"); |
695 | MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ |