Commit | Line | Data |
---|---|---|
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 | ||
39 | struct nvmet_ctrl *target_ctrl; | |
fe4a9791 | 40 | struct nvmet_port *port; |
3a85a5de CH |
41 | }; |
42 | ||
43 | static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) | |
44 | { | |
45 | return container_of(ctrl, struct nvme_loop_ctrl, ctrl); | |
46 | } | |
47 | ||
9d7fab04 SG |
48 | enum nvme_loop_queue_flags { |
49 | NVME_LOOP_Q_LIVE = 0, | |
50 | }; | |
51 | ||
3a85a5de CH |
52 | struct nvme_loop_queue { |
53 | struct nvmet_cq nvme_cq; | |
54 | struct nvmet_sq nvme_sq; | |
55 | struct nvme_loop_ctrl *ctrl; | |
9d7fab04 | 56 | unsigned long flags; |
3a85a5de CH |
57 | }; |
58 | ||
fe4a9791 CH |
59 | static LIST_HEAD(nvme_loop_ports); |
60 | static DEFINE_MUTEX(nvme_loop_ports_mutex); | |
3a85a5de CH |
61 | |
62 | static LIST_HEAD(nvme_loop_ctrl_list); | |
63 | static DEFINE_MUTEX(nvme_loop_ctrl_mutex); | |
64 | ||
65 | static void nvme_loop_queue_response(struct nvmet_req *nvme_req); | |
66 | static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl); | |
67 | ||
e929f06d | 68 | static const struct nvmet_fabrics_ops nvme_loop_ops; |
3a85a5de CH |
69 | |
70 | static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue) | |
71 | { | |
72 | return queue - queue->ctrl->queues; | |
73 | } | |
74 | ||
75 | static void nvme_loop_complete_rq(struct request *req) | |
76 | { | |
77 | struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req); | |
3a85a5de CH |
78 | |
79 | nvme_cleanup_cmd(req); | |
80 | sg_free_table_chained(&iod->sg_table, true); | |
77f02a7a | 81 | nvme_complete_rq(req); |
3a85a5de | 82 | } |
3a85a5de | 83 | |
3b068376 SG |
84 | static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue) |
85 | { | |
86 | u32 queue_idx = nvme_loop_queue_idx(queue); | |
3a85a5de | 87 | |
3b068376 SG |
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]; | |
3a85a5de CH |
91 | } |
92 | ||
d49187e9 | 93 | static void nvme_loop_queue_response(struct nvmet_req *req) |
3a85a5de | 94 | { |
3b068376 SG |
95 | struct nvme_loop_queue *queue = |
96 | container_of(req->sq, struct nvme_loop_queue, nvme_sq); | |
fc6c9730 | 97 | struct nvme_completion *cqe = req->cqe; |
3a85a5de CH |
98 | |
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 | */ | |
3b068376 | 105 | if (unlikely(nvme_loop_queue_idx(queue) == 0 && |
38dabe21 | 106 | cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { |
3b068376 | 107 | nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, |
7bf58533 | 108 | &cqe->result); |
3a85a5de | 109 | } else { |
3b068376 | 110 | struct request *rq; |
3b068376 SG |
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 | } | |
3a85a5de | 119 | |
27fa9bc5 | 120 | nvme_end_request(rq, cqe->status, cqe->result); |
3a85a5de CH |
121 | } |
122 | } | |
123 | ||
124 | static 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 | ||
5e62d5c9 | 129 | nvmet_req_execute(&iod->req); |
3a85a5de CH |
130 | } |
131 | ||
fc17b653 | 132 | static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, |
3a85a5de CH |
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); | |
3bc32bb1 | 139 | bool queue_ready = test_bit(NVME_LOOP_Q_LIVE, &queue->flags); |
fc17b653 | 140 | blk_status_t ret; |
3a85a5de | 141 | |
3bc32bb1 | 142 | if (!nvmf_check_ready(&queue->ctrl->ctrl, req, queue_ready)) |
6cdefc6e | 143 | return nvmf_fail_nonready_command(&queue->ctrl->ctrl, req); |
9d7fab04 | 144 | |
3a85a5de | 145 | ret = nvme_setup_cmd(ns, req, &iod->cmd); |
fc17b653 | 146 | if (ret) |
3a85a5de CH |
147 | return ret; |
148 | ||
11d9ea6f | 149 | blk_mq_start_request(req); |
3a85a5de | 150 | iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; |
fe4a9791 | 151 | iod->req.port = queue->ctrl->port; |
3a85a5de | 152 | if (!nvmet_req_init(&iod->req, &queue->nvme_cq, |
11d9ea6f | 153 | &queue->nvme_sq, &nvme_loop_ops)) |
fc17b653 | 154 | return BLK_STS_OK; |
3a85a5de | 155 | |
eb464833 | 156 | if (blk_rq_nr_phys_segments(req)) { |
3a85a5de | 157 | iod->sg_table.sgl = iod->first_sgl; |
fc17b653 | 158 | if (sg_alloc_table_chained(&iod->sg_table, |
f9d03f96 | 159 | blk_rq_nr_phys_segments(req), |
fc17b653 CH |
160 | iod->sg_table.sgl)) |
161 | return BLK_STS_RESOURCE; | |
3a85a5de CH |
162 | |
163 | iod->req.sg = iod->sg_table.sgl; | |
164 | iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); | |
796b0b8d | 165 | iod->req.transfer_len = blk_rq_payload_bytes(req); |
3a85a5de CH |
166 | } |
167 | ||
3a85a5de | 168 | schedule_work(&iod->work); |
fc17b653 | 169 | return BLK_STS_OK; |
3a85a5de CH |
170 | } |
171 | ||
ad22c355 | 172 | static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) |
3a85a5de CH |
173 | { |
174 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); | |
175 | struct nvme_loop_queue *queue = &ctrl->queues[0]; | |
176 | struct nvme_loop_iod *iod = &ctrl->async_event_iod; | |
177 | ||
178 | memset(&iod->cmd, 0, sizeof(iod->cmd)); | |
179 | iod->cmd.common.opcode = nvme_admin_async_event; | |
38dabe21 | 180 | iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; |
3a85a5de CH |
181 | iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; |
182 | ||
183 | if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, | |
184 | &nvme_loop_ops)) { | |
185 | dev_err(ctrl->ctrl.device, "failed async event work\n"); | |
186 | return; | |
187 | } | |
188 | ||
189 | schedule_work(&iod->work); | |
190 | } | |
191 | ||
192 | static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl, | |
193 | struct nvme_loop_iod *iod, unsigned int queue_idx) | |
194 | { | |
3a85a5de | 195 | iod->req.cmd = &iod->cmd; |
fc6c9730 | 196 | iod->req.cqe = &iod->cqe; |
3a85a5de CH |
197 | iod->queue = &ctrl->queues[queue_idx]; |
198 | INIT_WORK(&iod->work, nvme_loop_execute_work); | |
199 | return 0; | |
200 | } | |
201 | ||
d6296d39 CH |
202 | static int nvme_loop_init_request(struct blk_mq_tag_set *set, |
203 | struct request *req, unsigned int hctx_idx, | |
204 | unsigned int numa_node) | |
3a85a5de | 205 | { |
62b83b18 | 206 | struct nvme_loop_ctrl *ctrl = set->driver_data; |
3a85a5de | 207 | |
59e29ce6 | 208 | nvme_req(req)->ctrl = &ctrl->ctrl; |
62b83b18 CH |
209 | return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req), |
210 | (set == &ctrl->tag_set) ? hctx_idx + 1 : 0); | |
3a85a5de CH |
211 | } |
212 | ||
213 | static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
214 | unsigned int hctx_idx) | |
215 | { | |
216 | struct nvme_loop_ctrl *ctrl = data; | |
217 | struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1]; | |
218 | ||
d858e5f0 | 219 | BUG_ON(hctx_idx >= ctrl->ctrl.queue_count); |
3a85a5de CH |
220 | |
221 | hctx->driver_data = queue; | |
222 | return 0; | |
223 | } | |
224 | ||
225 | static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
226 | unsigned int hctx_idx) | |
227 | { | |
228 | struct nvme_loop_ctrl *ctrl = data; | |
229 | struct nvme_loop_queue *queue = &ctrl->queues[0]; | |
230 | ||
231 | BUG_ON(hctx_idx != 0); | |
232 | ||
233 | hctx->driver_data = queue; | |
234 | return 0; | |
235 | } | |
236 | ||
f363b089 | 237 | static const struct blk_mq_ops nvme_loop_mq_ops = { |
3a85a5de CH |
238 | .queue_rq = nvme_loop_queue_rq, |
239 | .complete = nvme_loop_complete_rq, | |
3a85a5de CH |
240 | .init_request = nvme_loop_init_request, |
241 | .init_hctx = nvme_loop_init_hctx, | |
3a85a5de CH |
242 | }; |
243 | ||
f363b089 | 244 | static const struct blk_mq_ops nvme_loop_admin_mq_ops = { |
3a85a5de CH |
245 | .queue_rq = nvme_loop_queue_rq, |
246 | .complete = nvme_loop_complete_rq, | |
62b83b18 | 247 | .init_request = nvme_loop_init_request, |
3a85a5de | 248 | .init_hctx = nvme_loop_init_admin_hctx, |
3a85a5de CH |
249 | }; |
250 | ||
251 | static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl) | |
252 | { | |
9d7fab04 | 253 | clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); |
e4c5d376 | 254 | nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); |
3a85a5de CH |
255 | blk_cleanup_queue(ctrl->ctrl.admin_q); |
256 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
3a85a5de CH |
257 | } |
258 | ||
259 | static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl) | |
260 | { | |
261 | struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); | |
262 | ||
263 | if (list_empty(&ctrl->list)) | |
264 | goto free_ctrl; | |
265 | ||
266 | mutex_lock(&nvme_loop_ctrl_mutex); | |
267 | list_del(&ctrl->list); | |
268 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
269 | ||
270 | if (nctrl->tagset) { | |
271 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
272 | blk_mq_free_tag_set(&ctrl->tag_set); | |
273 | } | |
274 | kfree(ctrl->queues); | |
275 | nvmf_free_options(nctrl->opts); | |
276 | free_ctrl: | |
277 | kfree(ctrl); | |
278 | } | |
279 | ||
945dd5ba SG |
280 | static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl) |
281 | { | |
282 | int i; | |
283 | ||
9d7fab04 SG |
284 | for (i = 1; i < ctrl->ctrl.queue_count; i++) { |
285 | clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); | |
945dd5ba | 286 | nvmet_sq_destroy(&ctrl->queues[i].nvme_sq); |
9d7fab04 | 287 | } |
945dd5ba SG |
288 | } |
289 | ||
290 | static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl) | |
291 | { | |
292 | struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; | |
293 | unsigned int nr_io_queues; | |
294 | int ret, i; | |
295 | ||
296 | nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); | |
297 | ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); | |
298 | if (ret || !nr_io_queues) | |
299 | return ret; | |
300 | ||
301 | dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues); | |
302 | ||
303 | for (i = 1; i <= nr_io_queues; i++) { | |
304 | ctrl->queues[i].ctrl = ctrl; | |
305 | ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq); | |
306 | if (ret) | |
307 | goto out_destroy_queues; | |
308 | ||
d858e5f0 | 309 | ctrl->ctrl.queue_count++; |
945dd5ba SG |
310 | } |
311 | ||
312 | return 0; | |
313 | ||
314 | out_destroy_queues: | |
315 | nvme_loop_destroy_io_queues(ctrl); | |
316 | return ret; | |
317 | } | |
318 | ||
297186d6 SG |
319 | static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl) |
320 | { | |
321 | int i, ret; | |
322 | ||
d858e5f0 | 323 | for (i = 1; i < ctrl->ctrl.queue_count; i++) { |
26c68227 | 324 | ret = nvmf_connect_io_queue(&ctrl->ctrl, i, false); |
297186d6 SG |
325 | if (ret) |
326 | return ret; | |
9d7fab04 | 327 | set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags); |
297186d6 SG |
328 | } |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
3a85a5de CH |
333 | static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) |
334 | { | |
335 | int error; | |
336 | ||
337 | memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); | |
338 | ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; | |
38dabe21 | 339 | ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; |
3a85a5de CH |
340 | ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ |
341 | ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; | |
342 | ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + | |
343 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
344 | ctrl->admin_tag_set.driver_data = ctrl; | |
345 | ctrl->admin_tag_set.nr_hw_queues = 1; | |
346 | ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; | |
86f36b9c | 347 | ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; |
3a85a5de CH |
348 | |
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 CH |
354 | |
355 | error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); | |
356 | if (error) | |
357 | goto out_free_sq; | |
34b6c231 | 358 | ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set; |
3a85a5de CH |
359 | |
360 | ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); | |
361 | if (IS_ERR(ctrl->ctrl.admin_q)) { | |
362 | error = PTR_ERR(ctrl->ctrl.admin_q); | |
363 | goto out_free_tagset; | |
364 | } | |
365 | ||
366 | error = nvmf_connect_admin_queue(&ctrl->ctrl); | |
367 | if (error) | |
368 | goto out_cleanup_queue; | |
369 | ||
9d7fab04 SG |
370 | set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags); |
371 | ||
20d0dfe6 | 372 | error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap); |
3a85a5de CH |
373 | if (error) { |
374 | dev_err(ctrl->ctrl.device, | |
375 | "prop_get NVME_REG_CAP failed\n"); | |
376 | goto out_cleanup_queue; | |
377 | } | |
378 | ||
379 | ctrl->ctrl.sqsize = | |
20d0dfe6 | 380 | min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize); |
3a85a5de | 381 | |
20d0dfe6 | 382 | error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap); |
3a85a5de CH |
383 | if (error) |
384 | goto out_cleanup_queue; | |
385 | ||
386 | ctrl->ctrl.max_hw_sectors = | |
387 | (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9); | |
388 | ||
389 | error = nvme_init_identify(&ctrl->ctrl); | |
390 | if (error) | |
391 | goto out_cleanup_queue; | |
392 | ||
3a85a5de CH |
393 | return 0; |
394 | ||
395 | out_cleanup_queue: | |
396 | blk_cleanup_queue(ctrl->ctrl.admin_q); | |
397 | out_free_tagset: | |
398 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
399 | out_free_sq: | |
400 | nvmet_sq_destroy(&ctrl->queues[0].nvme_sq); | |
401 | return error; | |
402 | } | |
403 | ||
404 | static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) | |
405 | { | |
d858e5f0 | 406 | if (ctrl->ctrl.queue_count > 1) { |
3a85a5de CH |
407 | nvme_stop_queues(&ctrl->ctrl); |
408 | blk_mq_tagset_busy_iter(&ctrl->tag_set, | |
409 | nvme_cancel_request, &ctrl->ctrl); | |
945dd5ba | 410 | nvme_loop_destroy_io_queues(ctrl); |
3a85a5de CH |
411 | } |
412 | ||
413 | if (ctrl->ctrl.state == NVME_CTRL_LIVE) | |
414 | nvme_shutdown_ctrl(&ctrl->ctrl); | |
415 | ||
c1c0ffff | 416 | blk_mq_quiesce_queue(ctrl->ctrl.admin_q); |
3a85a5de CH |
417 | blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, |
418 | nvme_cancel_request, &ctrl->ctrl); | |
c1c0ffff | 419 | blk_mq_unquiesce_queue(ctrl->ctrl.admin_q); |
3a85a5de CH |
420 | nvme_loop_destroy_admin_queue(ctrl); |
421 | } | |
422 | ||
c5017e85 | 423 | static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) |
3a85a5de | 424 | { |
c5017e85 | 425 | nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); |
3a85a5de CH |
426 | } |
427 | ||
428 | static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) | |
429 | { | |
430 | struct nvme_loop_ctrl *ctrl; | |
431 | ||
432 | mutex_lock(&nvme_loop_ctrl_mutex); | |
433 | list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { | |
434 | if (ctrl->ctrl.cntlid == nctrl->cntlid) | |
c5017e85 | 435 | nvme_delete_ctrl(&ctrl->ctrl); |
3a85a5de CH |
436 | } |
437 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
438 | } | |
439 | ||
440 | static void nvme_loop_reset_ctrl_work(struct work_struct *work) | |
441 | { | |
d86c4d8e CH |
442 | struct nvme_loop_ctrl *ctrl = |
443 | container_of(work, struct nvme_loop_ctrl, ctrl.reset_work); | |
3a85a5de | 444 | bool changed; |
297186d6 | 445 | int ret; |
3a85a5de | 446 | |
d09f2b45 | 447 | nvme_stop_ctrl(&ctrl->ctrl); |
3a85a5de CH |
448 | nvme_loop_shutdown_ctrl(ctrl); |
449 | ||
8bfc3b4c JT |
450 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) { |
451 | /* state change failure should never happen */ | |
452 | WARN_ON_ONCE(1); | |
453 | return; | |
454 | } | |
455 | ||
3a85a5de CH |
456 | ret = nvme_loop_configure_admin_queue(ctrl); |
457 | if (ret) | |
458 | goto out_disable; | |
459 | ||
945dd5ba SG |
460 | ret = nvme_loop_init_io_queues(ctrl); |
461 | if (ret) | |
462 | goto out_destroy_admin; | |
3a85a5de | 463 | |
297186d6 SG |
464 | ret = nvme_loop_connect_io_queues(ctrl); |
465 | if (ret) | |
466 | goto out_destroy_io; | |
3a85a5de | 467 | |
4368c39b SG |
468 | blk_mq_update_nr_hw_queues(&ctrl->tag_set, |
469 | ctrl->ctrl.queue_count - 1); | |
470 | ||
3a85a5de CH |
471 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); |
472 | WARN_ON_ONCE(!changed); | |
473 | ||
d09f2b45 | 474 | nvme_start_ctrl(&ctrl->ctrl); |
3a85a5de CH |
475 | |
476 | return; | |
477 | ||
945dd5ba SG |
478 | out_destroy_io: |
479 | nvme_loop_destroy_io_queues(ctrl); | |
480 | out_destroy_admin: | |
3a85a5de CH |
481 | nvme_loop_destroy_admin_queue(ctrl); |
482 | out_disable: | |
483 | dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); | |
3a85a5de CH |
484 | nvme_uninit_ctrl(&ctrl->ctrl); |
485 | nvme_put_ctrl(&ctrl->ctrl); | |
486 | } | |
487 | ||
3a85a5de CH |
488 | static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { |
489 | .name = "loop", | |
490 | .module = THIS_MODULE, | |
d3d5b87d | 491 | .flags = NVME_F_FABRICS, |
3a85a5de CH |
492 | .reg_read32 = nvmf_reg_read32, |
493 | .reg_read64 = nvmf_reg_read64, | |
494 | .reg_write32 = nvmf_reg_write32, | |
3a85a5de CH |
495 | .free_ctrl = nvme_loop_free_ctrl, |
496 | .submit_async_event = nvme_loop_submit_async_event, | |
c5017e85 | 497 | .delete_ctrl = nvme_loop_delete_ctrl_host, |
fe4a9791 | 498 | .get_address = nvmf_get_address, |
3a85a5de CH |
499 | }; |
500 | ||
501 | static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) | |
502 | { | |
297186d6 | 503 | int ret; |
3a85a5de | 504 | |
945dd5ba SG |
505 | ret = nvme_loop_init_io_queues(ctrl); |
506 | if (ret) | |
3a85a5de CH |
507 | return ret; |
508 | ||
3a85a5de CH |
509 | memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); |
510 | ctrl->tag_set.ops = &nvme_loop_mq_ops; | |
eadb7cf4 | 511 | ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; |
3a85a5de CH |
512 | ctrl->tag_set.reserved_tags = 1; /* fabric connect */ |
513 | ctrl->tag_set.numa_node = NUMA_NO_NODE; | |
514 | ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
515 | ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) + | |
516 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
517 | ctrl->tag_set.driver_data = ctrl; | |
d858e5f0 | 518 | ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1; |
3a85a5de CH |
519 | ctrl->tag_set.timeout = NVME_IO_TIMEOUT; |
520 | ctrl->ctrl.tagset = &ctrl->tag_set; | |
521 | ||
522 | ret = blk_mq_alloc_tag_set(&ctrl->tag_set); | |
523 | if (ret) | |
524 | goto out_destroy_queues; | |
525 | ||
526 | ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); | |
527 | if (IS_ERR(ctrl->ctrl.connect_q)) { | |
528 | ret = PTR_ERR(ctrl->ctrl.connect_q); | |
529 | goto out_free_tagset; | |
530 | } | |
531 | ||
297186d6 SG |
532 | ret = nvme_loop_connect_io_queues(ctrl); |
533 | if (ret) | |
534 | goto out_cleanup_connect_q; | |
3a85a5de CH |
535 | |
536 | return 0; | |
537 | ||
538 | out_cleanup_connect_q: | |
539 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
540 | out_free_tagset: | |
541 | blk_mq_free_tag_set(&ctrl->tag_set); | |
542 | out_destroy_queues: | |
945dd5ba | 543 | nvme_loop_destroy_io_queues(ctrl); |
3a85a5de CH |
544 | return ret; |
545 | } | |
546 | ||
fe4a9791 CH |
547 | static struct nvmet_port *nvme_loop_find_port(struct nvme_ctrl *ctrl) |
548 | { | |
549 | struct nvmet_port *p, *found = NULL; | |
550 | ||
551 | mutex_lock(&nvme_loop_ports_mutex); | |
552 | list_for_each_entry(p, &nvme_loop_ports, entry) { | |
553 | /* if no transport address is specified use the first port */ | |
554 | if ((ctrl->opts->mask & NVMF_OPT_TRADDR) && | |
555 | strcmp(ctrl->opts->traddr, p->disc_addr.traddr)) | |
556 | continue; | |
557 | found = p; | |
558 | break; | |
559 | } | |
560 | mutex_unlock(&nvme_loop_ports_mutex); | |
561 | return found; | |
562 | } | |
563 | ||
3a85a5de CH |
564 | static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, |
565 | struct nvmf_ctrl_options *opts) | |
566 | { | |
567 | struct nvme_loop_ctrl *ctrl; | |
568 | bool changed; | |
569 | int ret; | |
570 | ||
571 | ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); | |
572 | if (!ctrl) | |
573 | return ERR_PTR(-ENOMEM); | |
574 | ctrl->ctrl.opts = opts; | |
575 | INIT_LIST_HEAD(&ctrl->list); | |
576 | ||
d86c4d8e | 577 | INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); |
3a85a5de CH |
578 | |
579 | ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, | |
580 | 0 /* no quirks, we're perfect! */); | |
581 | if (ret) | |
582 | goto out_put_ctrl; | |
583 | ||
3a85a5de CH |
584 | ret = -ENOMEM; |
585 | ||
eadb7cf4 | 586 | ctrl->ctrl.sqsize = opts->queue_size - 1; |
3a85a5de | 587 | ctrl->ctrl.kato = opts->kato; |
fe4a9791 | 588 | ctrl->port = nvme_loop_find_port(&ctrl->ctrl); |
3a85a5de CH |
589 | |
590 | ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues), | |
591 | GFP_KERNEL); | |
592 | if (!ctrl->queues) | |
593 | goto out_uninit_ctrl; | |
594 | ||
595 | ret = nvme_loop_configure_admin_queue(ctrl); | |
596 | if (ret) | |
597 | goto out_free_queues; | |
598 | ||
599 | if (opts->queue_size > ctrl->ctrl.maxcmd) { | |
600 | /* warn if maxcmd is lower than queue_size */ | |
601 | dev_warn(ctrl->ctrl.device, | |
602 | "queue_size %zu > ctrl maxcmd %u, clamping down\n", | |
603 | opts->queue_size, ctrl->ctrl.maxcmd); | |
604 | opts->queue_size = ctrl->ctrl.maxcmd; | |
605 | } | |
606 | ||
607 | if (opts->nr_io_queues) { | |
608 | ret = nvme_loop_create_io_queues(ctrl); | |
609 | if (ret) | |
610 | goto out_remove_admin_queue; | |
611 | } | |
612 | ||
613 | nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0); | |
614 | ||
615 | dev_info(ctrl->ctrl.device, | |
616 | "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); | |
617 | ||
d22524a4 | 618 | nvme_get_ctrl(&ctrl->ctrl); |
3a85a5de CH |
619 | |
620 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
621 | WARN_ON_ONCE(!changed); | |
622 | ||
623 | mutex_lock(&nvme_loop_ctrl_mutex); | |
624 | list_add_tail(&ctrl->list, &nvme_loop_ctrl_list); | |
625 | mutex_unlock(&nvme_loop_ctrl_mutex); | |
626 | ||
d09f2b45 | 627 | nvme_start_ctrl(&ctrl->ctrl); |
3a85a5de CH |
628 | |
629 | return &ctrl->ctrl; | |
630 | ||
631 | out_remove_admin_queue: | |
632 | nvme_loop_destroy_admin_queue(ctrl); | |
633 | out_free_queues: | |
634 | kfree(ctrl->queues); | |
635 | out_uninit_ctrl: | |
636 | nvme_uninit_ctrl(&ctrl->ctrl); | |
637 | out_put_ctrl: | |
638 | nvme_put_ctrl(&ctrl->ctrl); | |
639 | if (ret > 0) | |
640 | ret = -EIO; | |
641 | return ERR_PTR(ret); | |
642 | } | |
643 | ||
644 | static int nvme_loop_add_port(struct nvmet_port *port) | |
645 | { | |
fe4a9791 CH |
646 | mutex_lock(&nvme_loop_ports_mutex); |
647 | list_add_tail(&port->entry, &nvme_loop_ports); | |
648 | mutex_unlock(&nvme_loop_ports_mutex); | |
3a85a5de CH |
649 | return 0; |
650 | } | |
651 | ||
652 | static void nvme_loop_remove_port(struct nvmet_port *port) | |
653 | { | |
fe4a9791 CH |
654 | mutex_lock(&nvme_loop_ports_mutex); |
655 | list_del_init(&port->entry); | |
656 | mutex_unlock(&nvme_loop_ports_mutex); | |
3a85a5de CH |
657 | } |
658 | ||
e929f06d | 659 | static const struct nvmet_fabrics_ops nvme_loop_ops = { |
3a85a5de CH |
660 | .owner = THIS_MODULE, |
661 | .type = NVMF_TRTYPE_LOOP, | |
662 | .add_port = nvme_loop_add_port, | |
663 | .remove_port = nvme_loop_remove_port, | |
664 | .queue_response = nvme_loop_queue_response, | |
665 | .delete_ctrl = nvme_loop_delete_ctrl, | |
666 | }; | |
667 | ||
668 | static struct nvmf_transport_ops nvme_loop_transport = { | |
669 | .name = "loop", | |
0de5cd36 | 670 | .module = THIS_MODULE, |
3a85a5de | 671 | .create_ctrl = nvme_loop_create_ctrl, |
fe4a9791 | 672 | .allowed_opts = NVMF_OPT_TRADDR, |
3a85a5de CH |
673 | }; |
674 | ||
675 | static int __init nvme_loop_init_module(void) | |
676 | { | |
677 | int ret; | |
678 | ||
679 | ret = nvmet_register_transport(&nvme_loop_ops); | |
680 | if (ret) | |
681 | return ret; | |
d19eef02 SG |
682 | |
683 | ret = nvmf_register_transport(&nvme_loop_transport); | |
684 | if (ret) | |
685 | nvmet_unregister_transport(&nvme_loop_ops); | |
686 | ||
687 | return ret; | |
3a85a5de CH |
688 | } |
689 | ||
690 | static void __exit nvme_loop_cleanup_module(void) | |
691 | { | |
692 | struct nvme_loop_ctrl *ctrl, *next; | |
693 | ||
694 | nvmf_unregister_transport(&nvme_loop_transport); | |
695 | nvmet_unregister_transport(&nvme_loop_ops); | |
696 | ||
697 | mutex_lock(&nvme_loop_ctrl_mutex); | |
698 | list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) | |
c5017e85 | 699 | nvme_delete_ctrl(&ctrl->ctrl); |
3a85a5de CH |
700 | mutex_unlock(&nvme_loop_ctrl_mutex); |
701 | ||
b227c59b | 702 | flush_workqueue(nvme_delete_wq); |
3a85a5de CH |
703 | } |
704 | ||
705 | module_init(nvme_loop_init_module); | |
706 | module_exit(nvme_loop_cleanup_module); | |
707 | ||
708 | MODULE_LICENSE("GPL v2"); | |
709 | MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */ |