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71102307 CH |
1 | /* |
2 | * NVMe over Fabrics RDMA host code. | |
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 | |
71102307 CH |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/string.h> | |
71102307 CH |
20 | #include <linux/atomic.h> |
21 | #include <linux/blk-mq.h> | |
22 | #include <linux/types.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/mutex.h> | |
25 | #include <linux/scatterlist.h> | |
26 | #include <linux/nvme.h> | |
71102307 CH |
27 | #include <asm/unaligned.h> |
28 | ||
29 | #include <rdma/ib_verbs.h> | |
30 | #include <rdma/rdma_cm.h> | |
31 | #include <rdma/ib_cm.h> | |
32 | #include <linux/nvme-rdma.h> | |
33 | ||
34 | #include "nvme.h" | |
35 | #include "fabrics.h" | |
36 | ||
37 | ||
38 | #define NVME_RDMA_CONNECT_TIMEOUT_MS 1000 /* 1 second */ | |
39 | ||
40 | #define NVME_RDMA_MAX_SEGMENT_SIZE 0xffffff /* 24-bit SGL field */ | |
41 | ||
42 | #define NVME_RDMA_MAX_SEGMENTS 256 | |
43 | ||
44 | #define NVME_RDMA_MAX_INLINE_SEGMENTS 1 | |
45 | ||
46 | #define NVME_RDMA_MAX_PAGES_PER_MR 512 | |
47 | ||
48 | #define NVME_RDMA_DEF_RECONNECT_DELAY 20 | |
49 | ||
50 | /* | |
51 | * We handle AEN commands ourselves and don't even let the | |
52 | * block layer know about them. | |
53 | */ | |
54 | #define NVME_RDMA_NR_AEN_COMMANDS 1 | |
55 | #define NVME_RDMA_AQ_BLKMQ_DEPTH \ | |
56 | (NVMF_AQ_DEPTH - NVME_RDMA_NR_AEN_COMMANDS) | |
57 | ||
58 | struct nvme_rdma_device { | |
59 | struct ib_device *dev; | |
60 | struct ib_pd *pd; | |
61 | struct ib_mr *mr; | |
62 | struct kref ref; | |
63 | struct list_head entry; | |
64 | }; | |
65 | ||
66 | struct nvme_rdma_qe { | |
67 | struct ib_cqe cqe; | |
68 | void *data; | |
69 | u64 dma; | |
70 | }; | |
71 | ||
72 | struct nvme_rdma_queue; | |
73 | struct nvme_rdma_request { | |
74 | struct ib_mr *mr; | |
75 | struct nvme_rdma_qe sqe; | |
76 | struct ib_sge sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS]; | |
77 | u32 num_sge; | |
78 | int nents; | |
79 | bool inline_data; | |
80 | bool need_inval; | |
81 | struct ib_reg_wr reg_wr; | |
82 | struct ib_cqe reg_cqe; | |
83 | struct nvme_rdma_queue *queue; | |
84 | struct sg_table sg_table; | |
85 | struct scatterlist first_sgl[]; | |
86 | }; | |
87 | ||
88 | enum nvme_rdma_queue_flags { | |
89 | NVME_RDMA_Q_CONNECTED = (1 << 0), | |
90 | }; | |
91 | ||
92 | struct nvme_rdma_queue { | |
93 | struct nvme_rdma_qe *rsp_ring; | |
94 | u8 sig_count; | |
95 | int queue_size; | |
96 | size_t cmnd_capsule_len; | |
97 | struct nvme_rdma_ctrl *ctrl; | |
98 | struct nvme_rdma_device *device; | |
99 | struct ib_cq *ib_cq; | |
100 | struct ib_qp *qp; | |
101 | ||
102 | unsigned long flags; | |
103 | struct rdma_cm_id *cm_id; | |
104 | int cm_error; | |
105 | struct completion cm_done; | |
106 | }; | |
107 | ||
108 | struct nvme_rdma_ctrl { | |
109 | /* read and written in the hot path */ | |
110 | spinlock_t lock; | |
111 | ||
112 | /* read only in the hot path */ | |
113 | struct nvme_rdma_queue *queues; | |
114 | u32 queue_count; | |
115 | ||
116 | /* other member variables */ | |
71102307 CH |
117 | struct blk_mq_tag_set tag_set; |
118 | struct work_struct delete_work; | |
119 | struct work_struct reset_work; | |
120 | struct work_struct err_work; | |
121 | ||
122 | struct nvme_rdma_qe async_event_sqe; | |
123 | ||
124 | int reconnect_delay; | |
125 | struct delayed_work reconnect_work; | |
126 | ||
127 | struct list_head list; | |
128 | ||
129 | struct blk_mq_tag_set admin_tag_set; | |
130 | struct nvme_rdma_device *device; | |
131 | ||
132 | u64 cap; | |
133 | u32 max_fr_pages; | |
134 | ||
135 | union { | |
136 | struct sockaddr addr; | |
137 | struct sockaddr_in addr_in; | |
138 | }; | |
139 | ||
140 | struct nvme_ctrl ctrl; | |
141 | }; | |
142 | ||
143 | static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl) | |
144 | { | |
145 | return container_of(ctrl, struct nvme_rdma_ctrl, ctrl); | |
146 | } | |
147 | ||
148 | static LIST_HEAD(device_list); | |
149 | static DEFINE_MUTEX(device_list_mutex); | |
150 | ||
151 | static LIST_HEAD(nvme_rdma_ctrl_list); | |
152 | static DEFINE_MUTEX(nvme_rdma_ctrl_mutex); | |
153 | ||
154 | static struct workqueue_struct *nvme_rdma_wq; | |
155 | ||
156 | /* | |
157 | * Disabling this option makes small I/O goes faster, but is fundamentally | |
158 | * unsafe. With it turned off we will have to register a global rkey that | |
159 | * allows read and write access to all physical memory. | |
160 | */ | |
161 | static bool register_always = true; | |
162 | module_param(register_always, bool, 0444); | |
163 | MODULE_PARM_DESC(register_always, | |
164 | "Use memory registration even for contiguous memory regions"); | |
165 | ||
166 | static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, | |
167 | struct rdma_cm_event *event); | |
168 | static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc); | |
71102307 CH |
169 | |
170 | /* XXX: really should move to a generic header sooner or later.. */ | |
171 | static inline void put_unaligned_le24(u32 val, u8 *p) | |
172 | { | |
173 | *p++ = val; | |
174 | *p++ = val >> 8; | |
175 | *p++ = val >> 16; | |
176 | } | |
177 | ||
178 | static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue) | |
179 | { | |
180 | return queue - queue->ctrl->queues; | |
181 | } | |
182 | ||
183 | static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue) | |
184 | { | |
185 | return queue->cmnd_capsule_len - sizeof(struct nvme_command); | |
186 | } | |
187 | ||
188 | static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe, | |
189 | size_t capsule_size, enum dma_data_direction dir) | |
190 | { | |
191 | ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir); | |
192 | kfree(qe->data); | |
193 | } | |
194 | ||
195 | static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe, | |
196 | size_t capsule_size, enum dma_data_direction dir) | |
197 | { | |
198 | qe->data = kzalloc(capsule_size, GFP_KERNEL); | |
199 | if (!qe->data) | |
200 | return -ENOMEM; | |
201 | ||
202 | qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir); | |
203 | if (ib_dma_mapping_error(ibdev, qe->dma)) { | |
204 | kfree(qe->data); | |
205 | return -ENOMEM; | |
206 | } | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | static void nvme_rdma_free_ring(struct ib_device *ibdev, | |
212 | struct nvme_rdma_qe *ring, size_t ib_queue_size, | |
213 | size_t capsule_size, enum dma_data_direction dir) | |
214 | { | |
215 | int i; | |
216 | ||
217 | for (i = 0; i < ib_queue_size; i++) | |
218 | nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir); | |
219 | kfree(ring); | |
220 | } | |
221 | ||
222 | static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev, | |
223 | size_t ib_queue_size, size_t capsule_size, | |
224 | enum dma_data_direction dir) | |
225 | { | |
226 | struct nvme_rdma_qe *ring; | |
227 | int i; | |
228 | ||
229 | ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL); | |
230 | if (!ring) | |
231 | return NULL; | |
232 | ||
233 | for (i = 0; i < ib_queue_size; i++) { | |
234 | if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir)) | |
235 | goto out_free_ring; | |
236 | } | |
237 | ||
238 | return ring; | |
239 | ||
240 | out_free_ring: | |
241 | nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir); | |
242 | return NULL; | |
243 | } | |
244 | ||
245 | static void nvme_rdma_qp_event(struct ib_event *event, void *context) | |
246 | { | |
247 | pr_debug("QP event %d\n", event->event); | |
248 | } | |
249 | ||
250 | static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue) | |
251 | { | |
252 | wait_for_completion_interruptible_timeout(&queue->cm_done, | |
253 | msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1); | |
254 | return queue->cm_error; | |
255 | } | |
256 | ||
257 | static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor) | |
258 | { | |
259 | struct nvme_rdma_device *dev = queue->device; | |
260 | struct ib_qp_init_attr init_attr; | |
261 | int ret; | |
262 | ||
263 | memset(&init_attr, 0, sizeof(init_attr)); | |
264 | init_attr.event_handler = nvme_rdma_qp_event; | |
265 | /* +1 for drain */ | |
266 | init_attr.cap.max_send_wr = factor * queue->queue_size + 1; | |
267 | /* +1 for drain */ | |
268 | init_attr.cap.max_recv_wr = queue->queue_size + 1; | |
269 | init_attr.cap.max_recv_sge = 1; | |
270 | init_attr.cap.max_send_sge = 1 + NVME_RDMA_MAX_INLINE_SEGMENTS; | |
271 | init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
272 | init_attr.qp_type = IB_QPT_RC; | |
273 | init_attr.send_cq = queue->ib_cq; | |
274 | init_attr.recv_cq = queue->ib_cq; | |
275 | ||
276 | ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr); | |
277 | ||
278 | queue->qp = queue->cm_id->qp; | |
279 | return ret; | |
280 | } | |
281 | ||
282 | static int nvme_rdma_reinit_request(void *data, struct request *rq) | |
283 | { | |
284 | struct nvme_rdma_ctrl *ctrl = data; | |
285 | struct nvme_rdma_device *dev = ctrl->device; | |
286 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
287 | int ret = 0; | |
288 | ||
289 | if (!req->need_inval) | |
290 | goto out; | |
291 | ||
292 | ib_dereg_mr(req->mr); | |
293 | ||
294 | req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG, | |
295 | ctrl->max_fr_pages); | |
296 | if (IS_ERR(req->mr)) { | |
71102307 | 297 | ret = PTR_ERR(req->mr); |
458a9632 | 298 | req->mr = NULL; |
71102307 CH |
299 | } |
300 | ||
301 | req->need_inval = false; | |
302 | ||
303 | out: | |
304 | return ret; | |
305 | } | |
306 | ||
307 | static void __nvme_rdma_exit_request(struct nvme_rdma_ctrl *ctrl, | |
308 | struct request *rq, unsigned int queue_idx) | |
309 | { | |
310 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
311 | struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx]; | |
312 | struct nvme_rdma_device *dev = queue->device; | |
313 | ||
314 | if (req->mr) | |
315 | ib_dereg_mr(req->mr); | |
316 | ||
317 | nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command), | |
318 | DMA_TO_DEVICE); | |
319 | } | |
320 | ||
321 | static void nvme_rdma_exit_request(void *data, struct request *rq, | |
322 | unsigned int hctx_idx, unsigned int rq_idx) | |
323 | { | |
324 | return __nvme_rdma_exit_request(data, rq, hctx_idx + 1); | |
325 | } | |
326 | ||
327 | static void nvme_rdma_exit_admin_request(void *data, struct request *rq, | |
328 | unsigned int hctx_idx, unsigned int rq_idx) | |
329 | { | |
330 | return __nvme_rdma_exit_request(data, rq, 0); | |
331 | } | |
332 | ||
333 | static int __nvme_rdma_init_request(struct nvme_rdma_ctrl *ctrl, | |
334 | struct request *rq, unsigned int queue_idx) | |
335 | { | |
336 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
337 | struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx]; | |
338 | struct nvme_rdma_device *dev = queue->device; | |
339 | struct ib_device *ibdev = dev->dev; | |
340 | int ret; | |
341 | ||
342 | BUG_ON(queue_idx >= ctrl->queue_count); | |
343 | ||
344 | ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command), | |
345 | DMA_TO_DEVICE); | |
346 | if (ret) | |
347 | return ret; | |
348 | ||
349 | req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG, | |
350 | ctrl->max_fr_pages); | |
351 | if (IS_ERR(req->mr)) { | |
352 | ret = PTR_ERR(req->mr); | |
353 | goto out_free_qe; | |
354 | } | |
355 | ||
356 | req->queue = queue; | |
357 | ||
358 | return 0; | |
359 | ||
360 | out_free_qe: | |
361 | nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command), | |
362 | DMA_TO_DEVICE); | |
363 | return -ENOMEM; | |
364 | } | |
365 | ||
366 | static int nvme_rdma_init_request(void *data, struct request *rq, | |
367 | unsigned int hctx_idx, unsigned int rq_idx, | |
368 | unsigned int numa_node) | |
369 | { | |
370 | return __nvme_rdma_init_request(data, rq, hctx_idx + 1); | |
371 | } | |
372 | ||
373 | static int nvme_rdma_init_admin_request(void *data, struct request *rq, | |
374 | unsigned int hctx_idx, unsigned int rq_idx, | |
375 | unsigned int numa_node) | |
376 | { | |
377 | return __nvme_rdma_init_request(data, rq, 0); | |
378 | } | |
379 | ||
380 | static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
381 | unsigned int hctx_idx) | |
382 | { | |
383 | struct nvme_rdma_ctrl *ctrl = data; | |
384 | struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1]; | |
385 | ||
386 | BUG_ON(hctx_idx >= ctrl->queue_count); | |
387 | ||
388 | hctx->driver_data = queue; | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
393 | unsigned int hctx_idx) | |
394 | { | |
395 | struct nvme_rdma_ctrl *ctrl = data; | |
396 | struct nvme_rdma_queue *queue = &ctrl->queues[0]; | |
397 | ||
398 | BUG_ON(hctx_idx != 0); | |
399 | ||
400 | hctx->driver_data = queue; | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static void nvme_rdma_free_dev(struct kref *ref) | |
405 | { | |
406 | struct nvme_rdma_device *ndev = | |
407 | container_of(ref, struct nvme_rdma_device, ref); | |
408 | ||
409 | mutex_lock(&device_list_mutex); | |
410 | list_del(&ndev->entry); | |
411 | mutex_unlock(&device_list_mutex); | |
412 | ||
413 | if (!register_always) | |
414 | ib_dereg_mr(ndev->mr); | |
415 | ib_dealloc_pd(ndev->pd); | |
416 | ||
417 | kfree(ndev); | |
418 | } | |
419 | ||
420 | static void nvme_rdma_dev_put(struct nvme_rdma_device *dev) | |
421 | { | |
422 | kref_put(&dev->ref, nvme_rdma_free_dev); | |
423 | } | |
424 | ||
425 | static int nvme_rdma_dev_get(struct nvme_rdma_device *dev) | |
426 | { | |
427 | return kref_get_unless_zero(&dev->ref); | |
428 | } | |
429 | ||
430 | static struct nvme_rdma_device * | |
431 | nvme_rdma_find_get_device(struct rdma_cm_id *cm_id) | |
432 | { | |
433 | struct nvme_rdma_device *ndev; | |
434 | ||
435 | mutex_lock(&device_list_mutex); | |
436 | list_for_each_entry(ndev, &device_list, entry) { | |
437 | if (ndev->dev->node_guid == cm_id->device->node_guid && | |
438 | nvme_rdma_dev_get(ndev)) | |
439 | goto out_unlock; | |
440 | } | |
441 | ||
442 | ndev = kzalloc(sizeof(*ndev), GFP_KERNEL); | |
443 | if (!ndev) | |
444 | goto out_err; | |
445 | ||
446 | ndev->dev = cm_id->device; | |
447 | kref_init(&ndev->ref); | |
448 | ||
449 | ndev->pd = ib_alloc_pd(ndev->dev); | |
450 | if (IS_ERR(ndev->pd)) | |
451 | goto out_free_dev; | |
452 | ||
453 | if (!register_always) { | |
454 | ndev->mr = ib_get_dma_mr(ndev->pd, | |
455 | IB_ACCESS_LOCAL_WRITE | | |
456 | IB_ACCESS_REMOTE_READ | | |
457 | IB_ACCESS_REMOTE_WRITE); | |
458 | if (IS_ERR(ndev->mr)) | |
459 | goto out_free_pd; | |
460 | } | |
461 | ||
462 | if (!(ndev->dev->attrs.device_cap_flags & | |
463 | IB_DEVICE_MEM_MGT_EXTENSIONS)) { | |
464 | dev_err(&ndev->dev->dev, | |
465 | "Memory registrations not supported.\n"); | |
466 | goto out_free_mr; | |
467 | } | |
468 | ||
469 | list_add(&ndev->entry, &device_list); | |
470 | out_unlock: | |
471 | mutex_unlock(&device_list_mutex); | |
472 | return ndev; | |
473 | ||
474 | out_free_mr: | |
475 | if (!register_always) | |
476 | ib_dereg_mr(ndev->mr); | |
477 | out_free_pd: | |
478 | ib_dealloc_pd(ndev->pd); | |
479 | out_free_dev: | |
480 | kfree(ndev); | |
481 | out_err: | |
482 | mutex_unlock(&device_list_mutex); | |
483 | return NULL; | |
484 | } | |
485 | ||
486 | static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue) | |
487 | { | |
488 | struct nvme_rdma_device *dev = queue->device; | |
489 | struct ib_device *ibdev = dev->dev; | |
490 | ||
491 | rdma_destroy_qp(queue->cm_id); | |
492 | ib_free_cq(queue->ib_cq); | |
493 | ||
494 | nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size, | |
495 | sizeof(struct nvme_completion), DMA_FROM_DEVICE); | |
496 | ||
497 | nvme_rdma_dev_put(dev); | |
498 | } | |
499 | ||
500 | static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue, | |
501 | struct nvme_rdma_device *dev) | |
502 | { | |
503 | struct ib_device *ibdev = dev->dev; | |
504 | const int send_wr_factor = 3; /* MR, SEND, INV */ | |
505 | const int cq_factor = send_wr_factor + 1; /* + RECV */ | |
506 | int comp_vector, idx = nvme_rdma_queue_idx(queue); | |
507 | ||
508 | int ret; | |
509 | ||
510 | queue->device = dev; | |
511 | ||
512 | /* | |
513 | * The admin queue is barely used once the controller is live, so don't | |
514 | * bother to spread it out. | |
515 | */ | |
516 | if (idx == 0) | |
517 | comp_vector = 0; | |
518 | else | |
519 | comp_vector = idx % ibdev->num_comp_vectors; | |
520 | ||
521 | ||
522 | /* +1 for ib_stop_cq */ | |
523 | queue->ib_cq = ib_alloc_cq(dev->dev, queue, | |
524 | cq_factor * queue->queue_size + 1, comp_vector, | |
525 | IB_POLL_SOFTIRQ); | |
526 | if (IS_ERR(queue->ib_cq)) { | |
527 | ret = PTR_ERR(queue->ib_cq); | |
528 | goto out; | |
529 | } | |
530 | ||
531 | ret = nvme_rdma_create_qp(queue, send_wr_factor); | |
532 | if (ret) | |
533 | goto out_destroy_ib_cq; | |
534 | ||
535 | queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size, | |
536 | sizeof(struct nvme_completion), DMA_FROM_DEVICE); | |
537 | if (!queue->rsp_ring) { | |
538 | ret = -ENOMEM; | |
539 | goto out_destroy_qp; | |
540 | } | |
541 | ||
542 | return 0; | |
543 | ||
544 | out_destroy_qp: | |
545 | ib_destroy_qp(queue->qp); | |
546 | out_destroy_ib_cq: | |
547 | ib_free_cq(queue->ib_cq); | |
548 | out: | |
549 | return ret; | |
550 | } | |
551 | ||
552 | static int nvme_rdma_init_queue(struct nvme_rdma_ctrl *ctrl, | |
553 | int idx, size_t queue_size) | |
554 | { | |
555 | struct nvme_rdma_queue *queue; | |
556 | int ret; | |
557 | ||
558 | queue = &ctrl->queues[idx]; | |
559 | queue->ctrl = ctrl; | |
560 | init_completion(&queue->cm_done); | |
561 | ||
562 | if (idx > 0) | |
563 | queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16; | |
564 | else | |
565 | queue->cmnd_capsule_len = sizeof(struct nvme_command); | |
566 | ||
567 | queue->queue_size = queue_size; | |
568 | ||
569 | queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue, | |
570 | RDMA_PS_TCP, IB_QPT_RC); | |
571 | if (IS_ERR(queue->cm_id)) { | |
572 | dev_info(ctrl->ctrl.device, | |
573 | "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id)); | |
574 | return PTR_ERR(queue->cm_id); | |
575 | } | |
576 | ||
577 | queue->cm_error = -ETIMEDOUT; | |
578 | ret = rdma_resolve_addr(queue->cm_id, NULL, &ctrl->addr, | |
579 | NVME_RDMA_CONNECT_TIMEOUT_MS); | |
580 | if (ret) { | |
581 | dev_info(ctrl->ctrl.device, | |
582 | "rdma_resolve_addr failed (%d).\n", ret); | |
583 | goto out_destroy_cm_id; | |
584 | } | |
585 | ||
586 | ret = nvme_rdma_wait_for_cm(queue); | |
587 | if (ret) { | |
588 | dev_info(ctrl->ctrl.device, | |
589 | "rdma_resolve_addr wait failed (%d).\n", ret); | |
590 | goto out_destroy_cm_id; | |
591 | } | |
592 | ||
593 | set_bit(NVME_RDMA_Q_CONNECTED, &queue->flags); | |
594 | ||
595 | return 0; | |
596 | ||
597 | out_destroy_cm_id: | |
598 | rdma_destroy_id(queue->cm_id); | |
599 | return ret; | |
600 | } | |
601 | ||
602 | static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue) | |
603 | { | |
604 | rdma_disconnect(queue->cm_id); | |
605 | ib_drain_qp(queue->qp); | |
606 | } | |
607 | ||
608 | static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue) | |
609 | { | |
610 | nvme_rdma_destroy_queue_ib(queue); | |
611 | rdma_destroy_id(queue->cm_id); | |
612 | } | |
613 | ||
614 | static void nvme_rdma_stop_and_free_queue(struct nvme_rdma_queue *queue) | |
615 | { | |
616 | if (!test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags)) | |
617 | return; | |
618 | nvme_rdma_stop_queue(queue); | |
619 | nvme_rdma_free_queue(queue); | |
620 | } | |
621 | ||
622 | static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl) | |
623 | { | |
624 | int i; | |
625 | ||
626 | for (i = 1; i < ctrl->queue_count; i++) | |
627 | nvme_rdma_stop_and_free_queue(&ctrl->queues[i]); | |
628 | } | |
629 | ||
630 | static int nvme_rdma_connect_io_queues(struct nvme_rdma_ctrl *ctrl) | |
631 | { | |
632 | int i, ret = 0; | |
633 | ||
634 | for (i = 1; i < ctrl->queue_count; i++) { | |
635 | ret = nvmf_connect_io_queue(&ctrl->ctrl, i); | |
636 | if (ret) | |
637 | break; | |
638 | } | |
639 | ||
640 | return ret; | |
641 | } | |
642 | ||
643 | static int nvme_rdma_init_io_queues(struct nvme_rdma_ctrl *ctrl) | |
644 | { | |
645 | int i, ret; | |
646 | ||
647 | for (i = 1; i < ctrl->queue_count; i++) { | |
648 | ret = nvme_rdma_init_queue(ctrl, i, ctrl->ctrl.sqsize); | |
649 | if (ret) { | |
650 | dev_info(ctrl->ctrl.device, | |
651 | "failed to initialize i/o queue: %d\n", ret); | |
652 | goto out_free_queues; | |
653 | } | |
654 | } | |
655 | ||
656 | return 0; | |
657 | ||
658 | out_free_queues: | |
659 | for (; i >= 1; i--) | |
660 | nvme_rdma_stop_and_free_queue(&ctrl->queues[i]); | |
661 | ||
662 | return ret; | |
663 | } | |
664 | ||
665 | static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl) | |
666 | { | |
667 | nvme_rdma_free_qe(ctrl->queues[0].device->dev, &ctrl->async_event_sqe, | |
668 | sizeof(struct nvme_command), DMA_TO_DEVICE); | |
669 | nvme_rdma_stop_and_free_queue(&ctrl->queues[0]); | |
670 | blk_cleanup_queue(ctrl->ctrl.admin_q); | |
671 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
672 | nvme_rdma_dev_put(ctrl->device); | |
673 | } | |
674 | ||
675 | static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl) | |
676 | { | |
677 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); | |
678 | ||
679 | if (list_empty(&ctrl->list)) | |
680 | goto free_ctrl; | |
681 | ||
682 | mutex_lock(&nvme_rdma_ctrl_mutex); | |
683 | list_del(&ctrl->list); | |
684 | mutex_unlock(&nvme_rdma_ctrl_mutex); | |
685 | ||
71102307 CH |
686 | kfree(ctrl->queues); |
687 | nvmf_free_options(nctrl->opts); | |
688 | free_ctrl: | |
689 | kfree(ctrl); | |
690 | } | |
691 | ||
692 | static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work) | |
693 | { | |
694 | struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work), | |
695 | struct nvme_rdma_ctrl, reconnect_work); | |
696 | bool changed; | |
697 | int ret; | |
698 | ||
699 | if (ctrl->queue_count > 1) { | |
700 | nvme_rdma_free_io_queues(ctrl); | |
701 | ||
702 | ret = blk_mq_reinit_tagset(&ctrl->tag_set); | |
703 | if (ret) | |
704 | goto requeue; | |
705 | } | |
706 | ||
707 | nvme_rdma_stop_and_free_queue(&ctrl->queues[0]); | |
708 | ||
709 | ret = blk_mq_reinit_tagset(&ctrl->admin_tag_set); | |
710 | if (ret) | |
711 | goto requeue; | |
712 | ||
713 | ret = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH); | |
714 | if (ret) | |
715 | goto requeue; | |
716 | ||
717 | blk_mq_start_stopped_hw_queues(ctrl->ctrl.admin_q, true); | |
718 | ||
719 | ret = nvmf_connect_admin_queue(&ctrl->ctrl); | |
720 | if (ret) | |
721 | goto stop_admin_q; | |
722 | ||
723 | ret = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap); | |
724 | if (ret) | |
725 | goto stop_admin_q; | |
726 | ||
727 | nvme_start_keep_alive(&ctrl->ctrl); | |
728 | ||
729 | if (ctrl->queue_count > 1) { | |
730 | ret = nvme_rdma_init_io_queues(ctrl); | |
731 | if (ret) | |
732 | goto stop_admin_q; | |
733 | ||
734 | ret = nvme_rdma_connect_io_queues(ctrl); | |
735 | if (ret) | |
736 | goto stop_admin_q; | |
737 | } | |
738 | ||
739 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
740 | WARN_ON_ONCE(!changed); | |
741 | ||
5f372eb3 | 742 | if (ctrl->queue_count > 1) { |
71102307 | 743 | nvme_start_queues(&ctrl->ctrl); |
5f372eb3 | 744 | nvme_queue_scan(&ctrl->ctrl); |
3ef1b4b2 | 745 | nvme_queue_async_events(&ctrl->ctrl); |
5f372eb3 | 746 | } |
71102307 CH |
747 | |
748 | dev_info(ctrl->ctrl.device, "Successfully reconnected\n"); | |
749 | ||
750 | return; | |
751 | ||
752 | stop_admin_q: | |
753 | blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); | |
754 | requeue: | |
755 | /* Make sure we are not resetting/deleting */ | |
756 | if (ctrl->ctrl.state == NVME_CTRL_RECONNECTING) { | |
757 | dev_info(ctrl->ctrl.device, | |
758 | "Failed reconnect attempt, requeueing...\n"); | |
759 | queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work, | |
760 | ctrl->reconnect_delay * HZ); | |
761 | } | |
762 | } | |
763 | ||
764 | static void nvme_rdma_error_recovery_work(struct work_struct *work) | |
765 | { | |
766 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
767 | struct nvme_rdma_ctrl, err_work); | |
768 | ||
769 | nvme_stop_keep_alive(&ctrl->ctrl); | |
770 | if (ctrl->queue_count > 1) | |
771 | nvme_stop_queues(&ctrl->ctrl); | |
772 | blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); | |
773 | ||
774 | /* We must take care of fastfail/requeue all our inflight requests */ | |
775 | if (ctrl->queue_count > 1) | |
776 | blk_mq_tagset_busy_iter(&ctrl->tag_set, | |
777 | nvme_cancel_request, &ctrl->ctrl); | |
778 | blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, | |
779 | nvme_cancel_request, &ctrl->ctrl); | |
780 | ||
781 | dev_info(ctrl->ctrl.device, "reconnecting in %d seconds\n", | |
782 | ctrl->reconnect_delay); | |
783 | ||
784 | queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work, | |
785 | ctrl->reconnect_delay * HZ); | |
786 | } | |
787 | ||
788 | static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl) | |
789 | { | |
790 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) | |
791 | return; | |
792 | ||
793 | queue_work(nvme_rdma_wq, &ctrl->err_work); | |
794 | } | |
795 | ||
796 | static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc, | |
797 | const char *op) | |
798 | { | |
799 | struct nvme_rdma_queue *queue = cq->cq_context; | |
800 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
801 | ||
802 | if (ctrl->ctrl.state == NVME_CTRL_LIVE) | |
803 | dev_info(ctrl->ctrl.device, | |
804 | "%s for CQE 0x%p failed with status %s (%d)\n", | |
805 | op, wc->wr_cqe, | |
806 | ib_wc_status_msg(wc->status), wc->status); | |
807 | nvme_rdma_error_recovery(ctrl); | |
808 | } | |
809 | ||
810 | static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc) | |
811 | { | |
812 | if (unlikely(wc->status != IB_WC_SUCCESS)) | |
813 | nvme_rdma_wr_error(cq, wc, "MEMREG"); | |
814 | } | |
815 | ||
816 | static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc) | |
817 | { | |
818 | if (unlikely(wc->status != IB_WC_SUCCESS)) | |
819 | nvme_rdma_wr_error(cq, wc, "LOCAL_INV"); | |
820 | } | |
821 | ||
822 | static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue, | |
823 | struct nvme_rdma_request *req) | |
824 | { | |
825 | struct ib_send_wr *bad_wr; | |
826 | struct ib_send_wr wr = { | |
827 | .opcode = IB_WR_LOCAL_INV, | |
828 | .next = NULL, | |
829 | .num_sge = 0, | |
830 | .send_flags = 0, | |
831 | .ex.invalidate_rkey = req->mr->rkey, | |
832 | }; | |
833 | ||
834 | req->reg_cqe.done = nvme_rdma_inv_rkey_done; | |
835 | wr.wr_cqe = &req->reg_cqe; | |
836 | ||
837 | return ib_post_send(queue->qp, &wr, &bad_wr); | |
838 | } | |
839 | ||
840 | static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue, | |
841 | struct request *rq) | |
842 | { | |
843 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
844 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
845 | struct nvme_rdma_device *dev = queue->device; | |
846 | struct ib_device *ibdev = dev->dev; | |
847 | int res; | |
848 | ||
849 | if (!blk_rq_bytes(rq)) | |
850 | return; | |
851 | ||
852 | if (req->need_inval) { | |
853 | res = nvme_rdma_inv_rkey(queue, req); | |
854 | if (res < 0) { | |
855 | dev_err(ctrl->ctrl.device, | |
856 | "Queueing INV WR for rkey %#x failed (%d)\n", | |
857 | req->mr->rkey, res); | |
858 | nvme_rdma_error_recovery(queue->ctrl); | |
859 | } | |
860 | } | |
861 | ||
862 | ib_dma_unmap_sg(ibdev, req->sg_table.sgl, | |
863 | req->nents, rq_data_dir(rq) == | |
864 | WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
865 | ||
866 | nvme_cleanup_cmd(rq); | |
867 | sg_free_table_chained(&req->sg_table, true); | |
868 | } | |
869 | ||
870 | static int nvme_rdma_set_sg_null(struct nvme_command *c) | |
871 | { | |
872 | struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; | |
873 | ||
874 | sg->addr = 0; | |
875 | put_unaligned_le24(0, sg->length); | |
876 | put_unaligned_le32(0, sg->key); | |
877 | sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4; | |
878 | return 0; | |
879 | } | |
880 | ||
881 | static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue, | |
882 | struct nvme_rdma_request *req, struct nvme_command *c) | |
883 | { | |
884 | struct nvme_sgl_desc *sg = &c->common.dptr.sgl; | |
885 | ||
886 | req->sge[1].addr = sg_dma_address(req->sg_table.sgl); | |
887 | req->sge[1].length = sg_dma_len(req->sg_table.sgl); | |
888 | req->sge[1].lkey = queue->device->pd->local_dma_lkey; | |
889 | ||
890 | sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff); | |
891 | sg->length = cpu_to_le32(sg_dma_len(req->sg_table.sgl)); | |
892 | sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET; | |
893 | ||
894 | req->inline_data = true; | |
895 | req->num_sge++; | |
896 | return 0; | |
897 | } | |
898 | ||
899 | static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue, | |
900 | struct nvme_rdma_request *req, struct nvme_command *c) | |
901 | { | |
902 | struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; | |
903 | ||
904 | sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl)); | |
905 | put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length); | |
906 | put_unaligned_le32(queue->device->mr->rkey, sg->key); | |
907 | sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4; | |
908 | return 0; | |
909 | } | |
910 | ||
911 | static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue, | |
912 | struct nvme_rdma_request *req, struct nvme_command *c, | |
913 | int count) | |
914 | { | |
915 | struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; | |
916 | int nr; | |
917 | ||
918 | nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, PAGE_SIZE); | |
919 | if (nr < count) { | |
920 | if (nr < 0) | |
921 | return nr; | |
922 | return -EINVAL; | |
923 | } | |
924 | ||
925 | ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey)); | |
926 | ||
927 | req->reg_cqe.done = nvme_rdma_memreg_done; | |
928 | memset(&req->reg_wr, 0, sizeof(req->reg_wr)); | |
929 | req->reg_wr.wr.opcode = IB_WR_REG_MR; | |
930 | req->reg_wr.wr.wr_cqe = &req->reg_cqe; | |
931 | req->reg_wr.wr.num_sge = 0; | |
932 | req->reg_wr.mr = req->mr; | |
933 | req->reg_wr.key = req->mr->rkey; | |
934 | req->reg_wr.access = IB_ACCESS_LOCAL_WRITE | | |
935 | IB_ACCESS_REMOTE_READ | | |
936 | IB_ACCESS_REMOTE_WRITE; | |
937 | ||
938 | req->need_inval = true; | |
939 | ||
940 | sg->addr = cpu_to_le64(req->mr->iova); | |
941 | put_unaligned_le24(req->mr->length, sg->length); | |
942 | put_unaligned_le32(req->mr->rkey, sg->key); | |
943 | sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) | | |
944 | NVME_SGL_FMT_INVALIDATE; | |
945 | ||
946 | return 0; | |
947 | } | |
948 | ||
949 | static int nvme_rdma_map_data(struct nvme_rdma_queue *queue, | |
950 | struct request *rq, unsigned int map_len, | |
951 | struct nvme_command *c) | |
952 | { | |
953 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
954 | struct nvme_rdma_device *dev = queue->device; | |
955 | struct ib_device *ibdev = dev->dev; | |
956 | int nents, count; | |
957 | int ret; | |
958 | ||
959 | req->num_sge = 1; | |
960 | req->inline_data = false; | |
961 | req->need_inval = false; | |
962 | ||
963 | c->common.flags |= NVME_CMD_SGL_METABUF; | |
964 | ||
965 | if (!blk_rq_bytes(rq)) | |
966 | return nvme_rdma_set_sg_null(c); | |
967 | ||
968 | req->sg_table.sgl = req->first_sgl; | |
969 | ret = sg_alloc_table_chained(&req->sg_table, rq->nr_phys_segments, | |
970 | req->sg_table.sgl); | |
971 | if (ret) | |
972 | return -ENOMEM; | |
973 | ||
974 | nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl); | |
975 | BUG_ON(nents > rq->nr_phys_segments); | |
976 | req->nents = nents; | |
977 | ||
978 | count = ib_dma_map_sg(ibdev, req->sg_table.sgl, nents, | |
979 | rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
980 | if (unlikely(count <= 0)) { | |
981 | sg_free_table_chained(&req->sg_table, true); | |
982 | return -EIO; | |
983 | } | |
984 | ||
985 | if (count == 1) { | |
986 | if (rq_data_dir(rq) == WRITE && | |
987 | map_len <= nvme_rdma_inline_data_size(queue) && | |
988 | nvme_rdma_queue_idx(queue)) | |
989 | return nvme_rdma_map_sg_inline(queue, req, c); | |
990 | ||
991 | if (!register_always) | |
992 | return nvme_rdma_map_sg_single(queue, req, c); | |
993 | } | |
994 | ||
995 | return nvme_rdma_map_sg_fr(queue, req, c, count); | |
996 | } | |
997 | ||
998 | static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) | |
999 | { | |
1000 | if (unlikely(wc->status != IB_WC_SUCCESS)) | |
1001 | nvme_rdma_wr_error(cq, wc, "SEND"); | |
1002 | } | |
1003 | ||
1004 | static int nvme_rdma_post_send(struct nvme_rdma_queue *queue, | |
1005 | struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge, | |
1006 | struct ib_send_wr *first, bool flush) | |
1007 | { | |
1008 | struct ib_send_wr wr, *bad_wr; | |
1009 | int ret; | |
1010 | ||
1011 | sge->addr = qe->dma; | |
1012 | sge->length = sizeof(struct nvme_command), | |
1013 | sge->lkey = queue->device->pd->local_dma_lkey; | |
1014 | ||
1015 | qe->cqe.done = nvme_rdma_send_done; | |
1016 | ||
1017 | wr.next = NULL; | |
1018 | wr.wr_cqe = &qe->cqe; | |
1019 | wr.sg_list = sge; | |
1020 | wr.num_sge = num_sge; | |
1021 | wr.opcode = IB_WR_SEND; | |
1022 | wr.send_flags = 0; | |
1023 | ||
1024 | /* | |
1025 | * Unsignalled send completions are another giant desaster in the | |
1026 | * IB Verbs spec: If we don't regularly post signalled sends | |
1027 | * the send queue will fill up and only a QP reset will rescue us. | |
1028 | * Would have been way to obvious to handle this in hardware or | |
1029 | * at least the RDMA stack.. | |
1030 | * | |
1031 | * This messy and racy code sniplet is copy and pasted from the iSER | |
1032 | * initiator, and the magic '32' comes from there as well. | |
1033 | * | |
1034 | * Always signal the flushes. The magic request used for the flush | |
1035 | * sequencer is not allocated in our driver's tagset and it's | |
1036 | * triggered to be freed by blk_cleanup_queue(). So we need to | |
1037 | * always mark it as signaled to ensure that the "wr_cqe", which is | |
1038 | * embeded in request's payload, is not freed when __ib_process_cq() | |
1039 | * calls wr_cqe->done(). | |
1040 | */ | |
1041 | if ((++queue->sig_count % 32) == 0 || flush) | |
1042 | wr.send_flags |= IB_SEND_SIGNALED; | |
1043 | ||
1044 | if (first) | |
1045 | first->next = ≀ | |
1046 | else | |
1047 | first = ≀ | |
1048 | ||
1049 | ret = ib_post_send(queue->qp, first, &bad_wr); | |
1050 | if (ret) { | |
1051 | dev_err(queue->ctrl->ctrl.device, | |
1052 | "%s failed with error code %d\n", __func__, ret); | |
1053 | } | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue, | |
1058 | struct nvme_rdma_qe *qe) | |
1059 | { | |
1060 | struct ib_recv_wr wr, *bad_wr; | |
1061 | struct ib_sge list; | |
1062 | int ret; | |
1063 | ||
1064 | list.addr = qe->dma; | |
1065 | list.length = sizeof(struct nvme_completion); | |
1066 | list.lkey = queue->device->pd->local_dma_lkey; | |
1067 | ||
1068 | qe->cqe.done = nvme_rdma_recv_done; | |
1069 | ||
1070 | wr.next = NULL; | |
1071 | wr.wr_cqe = &qe->cqe; | |
1072 | wr.sg_list = &list; | |
1073 | wr.num_sge = 1; | |
1074 | ||
1075 | ret = ib_post_recv(queue->qp, &wr, &bad_wr); | |
1076 | if (ret) { | |
1077 | dev_err(queue->ctrl->ctrl.device, | |
1078 | "%s failed with error code %d\n", __func__, ret); | |
1079 | } | |
1080 | return ret; | |
1081 | } | |
1082 | ||
1083 | static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue) | |
1084 | { | |
1085 | u32 queue_idx = nvme_rdma_queue_idx(queue); | |
1086 | ||
1087 | if (queue_idx == 0) | |
1088 | return queue->ctrl->admin_tag_set.tags[queue_idx]; | |
1089 | return queue->ctrl->tag_set.tags[queue_idx - 1]; | |
1090 | } | |
1091 | ||
1092 | static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg, int aer_idx) | |
1093 | { | |
1094 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg); | |
1095 | struct nvme_rdma_queue *queue = &ctrl->queues[0]; | |
1096 | struct ib_device *dev = queue->device->dev; | |
1097 | struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe; | |
1098 | struct nvme_command *cmd = sqe->data; | |
1099 | struct ib_sge sge; | |
1100 | int ret; | |
1101 | ||
1102 | if (WARN_ON_ONCE(aer_idx != 0)) | |
1103 | return; | |
1104 | ||
1105 | ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE); | |
1106 | ||
1107 | memset(cmd, 0, sizeof(*cmd)); | |
1108 | cmd->common.opcode = nvme_admin_async_event; | |
1109 | cmd->common.command_id = NVME_RDMA_AQ_BLKMQ_DEPTH; | |
1110 | cmd->common.flags |= NVME_CMD_SGL_METABUF; | |
1111 | nvme_rdma_set_sg_null(cmd); | |
1112 | ||
1113 | ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd), | |
1114 | DMA_TO_DEVICE); | |
1115 | ||
1116 | ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL, false); | |
1117 | WARN_ON_ONCE(ret); | |
1118 | } | |
1119 | ||
1120 | static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue, | |
1121 | struct nvme_completion *cqe, struct ib_wc *wc, int tag) | |
1122 | { | |
1123 | u16 status = le16_to_cpu(cqe->status); | |
1124 | struct request *rq; | |
1125 | struct nvme_rdma_request *req; | |
1126 | int ret = 0; | |
1127 | ||
1128 | status >>= 1; | |
1129 | ||
1130 | rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id); | |
1131 | if (!rq) { | |
1132 | dev_err(queue->ctrl->ctrl.device, | |
1133 | "tag 0x%x on QP %#x not found\n", | |
1134 | cqe->command_id, queue->qp->qp_num); | |
1135 | nvme_rdma_error_recovery(queue->ctrl); | |
1136 | return ret; | |
1137 | } | |
1138 | req = blk_mq_rq_to_pdu(rq); | |
1139 | ||
1140 | if (rq->cmd_type == REQ_TYPE_DRV_PRIV && rq->special) | |
1141 | memcpy(rq->special, cqe, sizeof(*cqe)); | |
1142 | ||
1143 | if (rq->tag == tag) | |
1144 | ret = 1; | |
1145 | ||
1146 | if ((wc->wc_flags & IB_WC_WITH_INVALIDATE) && | |
1147 | wc->ex.invalidate_rkey == req->mr->rkey) | |
1148 | req->need_inval = false; | |
1149 | ||
1150 | blk_mq_complete_request(rq, status); | |
1151 | ||
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag) | |
1156 | { | |
1157 | struct nvme_rdma_qe *qe = | |
1158 | container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe); | |
1159 | struct nvme_rdma_queue *queue = cq->cq_context; | |
1160 | struct ib_device *ibdev = queue->device->dev; | |
1161 | struct nvme_completion *cqe = qe->data; | |
1162 | const size_t len = sizeof(struct nvme_completion); | |
1163 | int ret = 0; | |
1164 | ||
1165 | if (unlikely(wc->status != IB_WC_SUCCESS)) { | |
1166 | nvme_rdma_wr_error(cq, wc, "RECV"); | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE); | |
1171 | /* | |
1172 | * AEN requests are special as they don't time out and can | |
1173 | * survive any kind of queue freeze and often don't respond to | |
1174 | * aborts. We don't even bother to allocate a struct request | |
1175 | * for them but rather special case them here. | |
1176 | */ | |
1177 | if (unlikely(nvme_rdma_queue_idx(queue) == 0 && | |
1178 | cqe->command_id >= NVME_RDMA_AQ_BLKMQ_DEPTH)) | |
1179 | nvme_complete_async_event(&queue->ctrl->ctrl, cqe); | |
1180 | else | |
1181 | ret = nvme_rdma_process_nvme_rsp(queue, cqe, wc, tag); | |
1182 | ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE); | |
1183 | ||
1184 | nvme_rdma_post_recv(queue, qe); | |
1185 | return ret; | |
1186 | } | |
1187 | ||
1188 | static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) | |
1189 | { | |
1190 | __nvme_rdma_recv_done(cq, wc, -1); | |
1191 | } | |
1192 | ||
1193 | static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue) | |
1194 | { | |
1195 | int ret, i; | |
1196 | ||
1197 | for (i = 0; i < queue->queue_size; i++) { | |
1198 | ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]); | |
1199 | if (ret) | |
1200 | goto out_destroy_queue_ib; | |
1201 | } | |
1202 | ||
1203 | return 0; | |
1204 | ||
1205 | out_destroy_queue_ib: | |
1206 | nvme_rdma_destroy_queue_ib(queue); | |
1207 | return ret; | |
1208 | } | |
1209 | ||
1210 | static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue, | |
1211 | struct rdma_cm_event *ev) | |
1212 | { | |
1213 | if (ev->param.conn.private_data_len) { | |
1214 | struct nvme_rdma_cm_rej *rej = | |
1215 | (struct nvme_rdma_cm_rej *)ev->param.conn.private_data; | |
1216 | ||
1217 | dev_err(queue->ctrl->ctrl.device, | |
1218 | "Connect rejected, status %d.", le16_to_cpu(rej->sts)); | |
1219 | /* XXX: Think of something clever to do here... */ | |
1220 | } else { | |
1221 | dev_err(queue->ctrl->ctrl.device, | |
1222 | "Connect rejected, no private data.\n"); | |
1223 | } | |
1224 | ||
1225 | return -ECONNRESET; | |
1226 | } | |
1227 | ||
1228 | static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue) | |
1229 | { | |
1230 | struct nvme_rdma_device *dev; | |
1231 | int ret; | |
1232 | ||
1233 | dev = nvme_rdma_find_get_device(queue->cm_id); | |
1234 | if (!dev) { | |
1235 | dev_err(queue->cm_id->device->dma_device, | |
1236 | "no client data found!\n"); | |
1237 | return -ECONNREFUSED; | |
1238 | } | |
1239 | ||
1240 | ret = nvme_rdma_create_queue_ib(queue, dev); | |
1241 | if (ret) { | |
1242 | nvme_rdma_dev_put(dev); | |
1243 | goto out; | |
1244 | } | |
1245 | ||
1246 | ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS); | |
1247 | if (ret) { | |
1248 | dev_err(queue->ctrl->ctrl.device, | |
1249 | "rdma_resolve_route failed (%d).\n", | |
1250 | queue->cm_error); | |
1251 | goto out_destroy_queue; | |
1252 | } | |
1253 | ||
1254 | return 0; | |
1255 | ||
1256 | out_destroy_queue: | |
1257 | nvme_rdma_destroy_queue_ib(queue); | |
1258 | out: | |
1259 | return ret; | |
1260 | } | |
1261 | ||
1262 | static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue) | |
1263 | { | |
1264 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
1265 | struct rdma_conn_param param = { }; | |
0b857b44 | 1266 | struct nvme_rdma_cm_req priv = { }; |
71102307 CH |
1267 | int ret; |
1268 | ||
1269 | param.qp_num = queue->qp->qp_num; | |
1270 | param.flow_control = 1; | |
1271 | ||
1272 | param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom; | |
2ac17c28 SG |
1273 | /* maximum retry count */ |
1274 | param.retry_count = 7; | |
71102307 CH |
1275 | param.rnr_retry_count = 7; |
1276 | param.private_data = &priv; | |
1277 | param.private_data_len = sizeof(priv); | |
1278 | ||
1279 | priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); | |
1280 | priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue)); | |
1281 | priv.hrqsize = cpu_to_le16(queue->queue_size); | |
1282 | priv.hsqsize = cpu_to_le16(queue->queue_size); | |
1283 | ||
1284 | ret = rdma_connect(queue->cm_id, ¶m); | |
1285 | if (ret) { | |
1286 | dev_err(ctrl->ctrl.device, | |
1287 | "rdma_connect failed (%d).\n", ret); | |
1288 | goto out_destroy_queue_ib; | |
1289 | } | |
1290 | ||
1291 | return 0; | |
1292 | ||
1293 | out_destroy_queue_ib: | |
1294 | nvme_rdma_destroy_queue_ib(queue); | |
1295 | return ret; | |
1296 | } | |
1297 | ||
1298 | /** | |
1299 | * nvme_rdma_device_unplug() - Handle RDMA device unplug | |
1300 | * @queue: Queue that owns the cm_id that caught the event | |
1301 | * | |
1302 | * DEVICE_REMOVAL event notifies us that the RDMA device is about | |
1303 | * to unplug so we should take care of destroying our RDMA resources. | |
1304 | * This event will be generated for each allocated cm_id. | |
1305 | * | |
1306 | * In our case, the RDMA resources are managed per controller and not | |
1307 | * only per queue. So the way we handle this is we trigger an implicit | |
1308 | * controller deletion upon the first DEVICE_REMOVAL event we see, and | |
1309 | * hold the event inflight until the controller deletion is completed. | |
1310 | * | |
1311 | * One exception that we need to handle is the destruction of the cm_id | |
1312 | * that caught the event. Since we hold the callout until the controller | |
1313 | * deletion is completed, we'll deadlock if the controller deletion will | |
1314 | * call rdma_destroy_id on this queue's cm_id. Thus, we claim ownership | |
57de5a0a SG |
1315 | * of destroying this queue before-hand, destroy the queue resources, |
1316 | * then queue the controller deletion which won't destroy this queue and | |
1317 | * we destroy the cm_id implicitely by returning a non-zero rc to the callout. | |
71102307 CH |
1318 | */ |
1319 | static int nvme_rdma_device_unplug(struct nvme_rdma_queue *queue) | |
1320 | { | |
1321 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
39bbee4e | 1322 | int ret = 0; |
71102307 | 1323 | |
57de5a0a SG |
1324 | /* Own the controller deletion */ |
1325 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) | |
1326 | return 0; | |
71102307 | 1327 | |
57de5a0a SG |
1328 | dev_warn(ctrl->ctrl.device, |
1329 | "Got rdma device removal event, deleting ctrl\n"); | |
71102307 | 1330 | |
57de5a0a SG |
1331 | /* Get rid of reconnect work if its running */ |
1332 | cancel_delayed_work_sync(&ctrl->reconnect_work); | |
71102307 | 1333 | |
57de5a0a SG |
1334 | /* Disable the queue so ctrl delete won't free it */ |
1335 | if (test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags)) { | |
71102307 | 1336 | /* Free this queue ourselves */ |
57de5a0a | 1337 | nvme_rdma_stop_queue(queue); |
71102307 | 1338 | nvme_rdma_destroy_queue_ib(queue); |
57de5a0a SG |
1339 | |
1340 | /* Return non-zero so the cm_id will destroy implicitly */ | |
1341 | ret = 1; | |
71102307 CH |
1342 | } |
1343 | ||
57de5a0a SG |
1344 | /* Queue controller deletion */ |
1345 | queue_work(nvme_rdma_wq, &ctrl->delete_work); | |
1346 | flush_work(&ctrl->delete_work); | |
1347 | return ret; | |
71102307 CH |
1348 | } |
1349 | ||
1350 | static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, | |
1351 | struct rdma_cm_event *ev) | |
1352 | { | |
1353 | struct nvme_rdma_queue *queue = cm_id->context; | |
1354 | int cm_error = 0; | |
1355 | ||
1356 | dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n", | |
1357 | rdma_event_msg(ev->event), ev->event, | |
1358 | ev->status, cm_id); | |
1359 | ||
1360 | switch (ev->event) { | |
1361 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
1362 | cm_error = nvme_rdma_addr_resolved(queue); | |
1363 | break; | |
1364 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
1365 | cm_error = nvme_rdma_route_resolved(queue); | |
1366 | break; | |
1367 | case RDMA_CM_EVENT_ESTABLISHED: | |
1368 | queue->cm_error = nvme_rdma_conn_established(queue); | |
1369 | /* complete cm_done regardless of success/failure */ | |
1370 | complete(&queue->cm_done); | |
1371 | return 0; | |
1372 | case RDMA_CM_EVENT_REJECTED: | |
1373 | cm_error = nvme_rdma_conn_rejected(queue, ev); | |
1374 | break; | |
1375 | case RDMA_CM_EVENT_ADDR_ERROR: | |
1376 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
1377 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
1378 | case RDMA_CM_EVENT_UNREACHABLE: | |
1379 | dev_dbg(queue->ctrl->ctrl.device, | |
1380 | "CM error event %d\n", ev->event); | |
1381 | cm_error = -ECONNRESET; | |
1382 | break; | |
1383 | case RDMA_CM_EVENT_DISCONNECTED: | |
1384 | case RDMA_CM_EVENT_ADDR_CHANGE: | |
1385 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: | |
1386 | dev_dbg(queue->ctrl->ctrl.device, | |
1387 | "disconnect received - connection closed\n"); | |
1388 | nvme_rdma_error_recovery(queue->ctrl); | |
1389 | break; | |
1390 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
1391 | /* return 1 means impliciy CM ID destroy */ | |
1392 | return nvme_rdma_device_unplug(queue); | |
1393 | default: | |
1394 | dev_err(queue->ctrl->ctrl.device, | |
1395 | "Unexpected RDMA CM event (%d)\n", ev->event); | |
1396 | nvme_rdma_error_recovery(queue->ctrl); | |
1397 | break; | |
1398 | } | |
1399 | ||
1400 | if (cm_error) { | |
1401 | queue->cm_error = cm_error; | |
1402 | complete(&queue->cm_done); | |
1403 | } | |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | static enum blk_eh_timer_return | |
1409 | nvme_rdma_timeout(struct request *rq, bool reserved) | |
1410 | { | |
1411 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
1412 | ||
1413 | /* queue error recovery */ | |
1414 | nvme_rdma_error_recovery(req->queue->ctrl); | |
1415 | ||
1416 | /* fail with DNR on cmd timeout */ | |
1417 | rq->errors = NVME_SC_ABORT_REQ | NVME_SC_DNR; | |
1418 | ||
1419 | return BLK_EH_HANDLED; | |
1420 | } | |
1421 | ||
1422 | static int nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx, | |
1423 | const struct blk_mq_queue_data *bd) | |
1424 | { | |
1425 | struct nvme_ns *ns = hctx->queue->queuedata; | |
1426 | struct nvme_rdma_queue *queue = hctx->driver_data; | |
1427 | struct request *rq = bd->rq; | |
1428 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
1429 | struct nvme_rdma_qe *sqe = &req->sqe; | |
1430 | struct nvme_command *c = sqe->data; | |
1431 | bool flush = false; | |
1432 | struct ib_device *dev; | |
1433 | unsigned int map_len; | |
1434 | int ret; | |
1435 | ||
1436 | WARN_ON_ONCE(rq->tag < 0); | |
1437 | ||
1438 | dev = queue->device->dev; | |
1439 | ib_dma_sync_single_for_cpu(dev, sqe->dma, | |
1440 | sizeof(struct nvme_command), DMA_TO_DEVICE); | |
1441 | ||
1442 | ret = nvme_setup_cmd(ns, rq, c); | |
1443 | if (ret) | |
1444 | return ret; | |
1445 | ||
1446 | c->common.command_id = rq->tag; | |
1447 | blk_mq_start_request(rq); | |
1448 | ||
1449 | map_len = nvme_map_len(rq); | |
1450 | ret = nvme_rdma_map_data(queue, rq, map_len, c); | |
1451 | if (ret < 0) { | |
1452 | dev_err(queue->ctrl->ctrl.device, | |
1453 | "Failed to map data (%d)\n", ret); | |
1454 | nvme_cleanup_cmd(rq); | |
1455 | goto err; | |
1456 | } | |
1457 | ||
1458 | ib_dma_sync_single_for_device(dev, sqe->dma, | |
1459 | sizeof(struct nvme_command), DMA_TO_DEVICE); | |
1460 | ||
1461 | if (rq->cmd_type == REQ_TYPE_FS && req_op(rq) == REQ_OP_FLUSH) | |
1462 | flush = true; | |
1463 | ret = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge, | |
1464 | req->need_inval ? &req->reg_wr.wr : NULL, flush); | |
1465 | if (ret) { | |
1466 | nvme_rdma_unmap_data(queue, rq); | |
1467 | goto err; | |
1468 | } | |
1469 | ||
1470 | return BLK_MQ_RQ_QUEUE_OK; | |
1471 | err: | |
1472 | return (ret == -ENOMEM || ret == -EAGAIN) ? | |
1473 | BLK_MQ_RQ_QUEUE_BUSY : BLK_MQ_RQ_QUEUE_ERROR; | |
1474 | } | |
1475 | ||
1476 | static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) | |
1477 | { | |
1478 | struct nvme_rdma_queue *queue = hctx->driver_data; | |
1479 | struct ib_cq *cq = queue->ib_cq; | |
1480 | struct ib_wc wc; | |
1481 | int found = 0; | |
1482 | ||
1483 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
1484 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
1485 | struct ib_cqe *cqe = wc.wr_cqe; | |
1486 | ||
1487 | if (cqe) { | |
1488 | if (cqe->done == nvme_rdma_recv_done) | |
1489 | found |= __nvme_rdma_recv_done(cq, &wc, tag); | |
1490 | else | |
1491 | cqe->done(cq, &wc); | |
1492 | } | |
1493 | } | |
1494 | ||
1495 | return found; | |
1496 | } | |
1497 | ||
1498 | static void nvme_rdma_complete_rq(struct request *rq) | |
1499 | { | |
1500 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
1501 | struct nvme_rdma_queue *queue = req->queue; | |
1502 | int error = 0; | |
1503 | ||
1504 | nvme_rdma_unmap_data(queue, rq); | |
1505 | ||
1506 | if (unlikely(rq->errors)) { | |
1507 | if (nvme_req_needs_retry(rq, rq->errors)) { | |
1508 | nvme_requeue_req(rq); | |
1509 | return; | |
1510 | } | |
1511 | ||
1512 | if (rq->cmd_type == REQ_TYPE_DRV_PRIV) | |
1513 | error = rq->errors; | |
1514 | else | |
1515 | error = nvme_error_status(rq->errors); | |
1516 | } | |
1517 | ||
1518 | blk_mq_end_request(rq, error); | |
1519 | } | |
1520 | ||
1521 | static struct blk_mq_ops nvme_rdma_mq_ops = { | |
1522 | .queue_rq = nvme_rdma_queue_rq, | |
1523 | .complete = nvme_rdma_complete_rq, | |
1524 | .map_queue = blk_mq_map_queue, | |
1525 | .init_request = nvme_rdma_init_request, | |
1526 | .exit_request = nvme_rdma_exit_request, | |
1527 | .reinit_request = nvme_rdma_reinit_request, | |
1528 | .init_hctx = nvme_rdma_init_hctx, | |
1529 | .poll = nvme_rdma_poll, | |
1530 | .timeout = nvme_rdma_timeout, | |
1531 | }; | |
1532 | ||
1533 | static struct blk_mq_ops nvme_rdma_admin_mq_ops = { | |
1534 | .queue_rq = nvme_rdma_queue_rq, | |
1535 | .complete = nvme_rdma_complete_rq, | |
1536 | .map_queue = blk_mq_map_queue, | |
1537 | .init_request = nvme_rdma_init_admin_request, | |
1538 | .exit_request = nvme_rdma_exit_admin_request, | |
1539 | .reinit_request = nvme_rdma_reinit_request, | |
1540 | .init_hctx = nvme_rdma_init_admin_hctx, | |
1541 | .timeout = nvme_rdma_timeout, | |
1542 | }; | |
1543 | ||
1544 | static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl) | |
1545 | { | |
1546 | int error; | |
1547 | ||
1548 | error = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH); | |
1549 | if (error) | |
1550 | return error; | |
1551 | ||
1552 | ctrl->device = ctrl->queues[0].device; | |
1553 | ||
1554 | /* | |
1555 | * We need a reference on the device as long as the tag_set is alive, | |
1556 | * as the MRs in the request structures need a valid ib_device. | |
1557 | */ | |
1558 | error = -EINVAL; | |
1559 | if (!nvme_rdma_dev_get(ctrl->device)) | |
1560 | goto out_free_queue; | |
1561 | ||
1562 | ctrl->max_fr_pages = min_t(u32, NVME_RDMA_MAX_SEGMENTS, | |
1563 | ctrl->device->dev->attrs.max_fast_reg_page_list_len); | |
1564 | ||
1565 | memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); | |
1566 | ctrl->admin_tag_set.ops = &nvme_rdma_admin_mq_ops; | |
1567 | ctrl->admin_tag_set.queue_depth = NVME_RDMA_AQ_BLKMQ_DEPTH; | |
1568 | ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ | |
1569 | ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; | |
1570 | ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_rdma_request) + | |
1571 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
1572 | ctrl->admin_tag_set.driver_data = ctrl; | |
1573 | ctrl->admin_tag_set.nr_hw_queues = 1; | |
1574 | ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; | |
1575 | ||
1576 | error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); | |
1577 | if (error) | |
1578 | goto out_put_dev; | |
1579 | ||
1580 | ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); | |
1581 | if (IS_ERR(ctrl->ctrl.admin_q)) { | |
1582 | error = PTR_ERR(ctrl->ctrl.admin_q); | |
1583 | goto out_free_tagset; | |
1584 | } | |
1585 | ||
1586 | error = nvmf_connect_admin_queue(&ctrl->ctrl); | |
1587 | if (error) | |
1588 | goto out_cleanup_queue; | |
1589 | ||
1590 | error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap); | |
1591 | if (error) { | |
1592 | dev_err(ctrl->ctrl.device, | |
1593 | "prop_get NVME_REG_CAP failed\n"); | |
1594 | goto out_cleanup_queue; | |
1595 | } | |
1596 | ||
1597 | ctrl->ctrl.sqsize = | |
1598 | min_t(int, NVME_CAP_MQES(ctrl->cap) + 1, ctrl->ctrl.sqsize); | |
1599 | ||
1600 | error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap); | |
1601 | if (error) | |
1602 | goto out_cleanup_queue; | |
1603 | ||
1604 | ctrl->ctrl.max_hw_sectors = | |
1605 | (ctrl->max_fr_pages - 1) << (PAGE_SHIFT - 9); | |
1606 | ||
1607 | error = nvme_init_identify(&ctrl->ctrl); | |
1608 | if (error) | |
1609 | goto out_cleanup_queue; | |
1610 | ||
1611 | error = nvme_rdma_alloc_qe(ctrl->queues[0].device->dev, | |
1612 | &ctrl->async_event_sqe, sizeof(struct nvme_command), | |
1613 | DMA_TO_DEVICE); | |
1614 | if (error) | |
1615 | goto out_cleanup_queue; | |
1616 | ||
1617 | nvme_start_keep_alive(&ctrl->ctrl); | |
1618 | ||
1619 | return 0; | |
1620 | ||
1621 | out_cleanup_queue: | |
1622 | blk_cleanup_queue(ctrl->ctrl.admin_q); | |
1623 | out_free_tagset: | |
1624 | /* disconnect and drain the queue before freeing the tagset */ | |
1625 | nvme_rdma_stop_queue(&ctrl->queues[0]); | |
1626 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
1627 | out_put_dev: | |
1628 | nvme_rdma_dev_put(ctrl->device); | |
1629 | out_free_queue: | |
1630 | nvme_rdma_free_queue(&ctrl->queues[0]); | |
1631 | return error; | |
1632 | } | |
1633 | ||
1634 | static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl) | |
1635 | { | |
1636 | nvme_stop_keep_alive(&ctrl->ctrl); | |
1637 | cancel_work_sync(&ctrl->err_work); | |
1638 | cancel_delayed_work_sync(&ctrl->reconnect_work); | |
1639 | ||
1640 | if (ctrl->queue_count > 1) { | |
1641 | nvme_stop_queues(&ctrl->ctrl); | |
1642 | blk_mq_tagset_busy_iter(&ctrl->tag_set, | |
1643 | nvme_cancel_request, &ctrl->ctrl); | |
1644 | nvme_rdma_free_io_queues(ctrl); | |
1645 | } | |
1646 | ||
45862ebc | 1647 | if (test_bit(NVME_RDMA_Q_CONNECTED, &ctrl->queues[0].flags)) |
71102307 CH |
1648 | nvme_shutdown_ctrl(&ctrl->ctrl); |
1649 | ||
1650 | blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); | |
1651 | blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, | |
1652 | nvme_cancel_request, &ctrl->ctrl); | |
1653 | nvme_rdma_destroy_admin_queue(ctrl); | |
1654 | } | |
1655 | ||
2461a8dd SG |
1656 | static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown) |
1657 | { | |
1658 | nvme_uninit_ctrl(&ctrl->ctrl); | |
1659 | if (shutdown) | |
1660 | nvme_rdma_shutdown_ctrl(ctrl); | |
a34ca17a SG |
1661 | |
1662 | if (ctrl->ctrl.tagset) { | |
1663 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
1664 | blk_mq_free_tag_set(&ctrl->tag_set); | |
1665 | nvme_rdma_dev_put(ctrl->device); | |
1666 | } | |
1667 | ||
2461a8dd SG |
1668 | nvme_put_ctrl(&ctrl->ctrl); |
1669 | } | |
1670 | ||
71102307 CH |
1671 | static void nvme_rdma_del_ctrl_work(struct work_struct *work) |
1672 | { | |
1673 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
1674 | struct nvme_rdma_ctrl, delete_work); | |
1675 | ||
2461a8dd | 1676 | __nvme_rdma_remove_ctrl(ctrl, true); |
71102307 CH |
1677 | } |
1678 | ||
1679 | static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl) | |
1680 | { | |
1681 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) | |
1682 | return -EBUSY; | |
1683 | ||
1684 | if (!queue_work(nvme_rdma_wq, &ctrl->delete_work)) | |
1685 | return -EBUSY; | |
1686 | ||
1687 | return 0; | |
1688 | } | |
1689 | ||
1690 | static int nvme_rdma_del_ctrl(struct nvme_ctrl *nctrl) | |
1691 | { | |
1692 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); | |
1693 | int ret; | |
1694 | ||
1695 | ret = __nvme_rdma_del_ctrl(ctrl); | |
1696 | if (ret) | |
1697 | return ret; | |
1698 | ||
1699 | flush_work(&ctrl->delete_work); | |
1700 | ||
1701 | return 0; | |
1702 | } | |
1703 | ||
1704 | static void nvme_rdma_remove_ctrl_work(struct work_struct *work) | |
1705 | { | |
1706 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
1707 | struct nvme_rdma_ctrl, delete_work); | |
1708 | ||
2461a8dd | 1709 | __nvme_rdma_remove_ctrl(ctrl, false); |
71102307 CH |
1710 | } |
1711 | ||
1712 | static void nvme_rdma_reset_ctrl_work(struct work_struct *work) | |
1713 | { | |
1714 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
1715 | struct nvme_rdma_ctrl, reset_work); | |
1716 | int ret; | |
1717 | bool changed; | |
1718 | ||
1719 | nvme_rdma_shutdown_ctrl(ctrl); | |
1720 | ||
1721 | ret = nvme_rdma_configure_admin_queue(ctrl); | |
1722 | if (ret) { | |
1723 | /* ctrl is already shutdown, just remove the ctrl */ | |
1724 | INIT_WORK(&ctrl->delete_work, nvme_rdma_remove_ctrl_work); | |
1725 | goto del_dead_ctrl; | |
1726 | } | |
1727 | ||
1728 | if (ctrl->queue_count > 1) { | |
1729 | ret = blk_mq_reinit_tagset(&ctrl->tag_set); | |
1730 | if (ret) | |
1731 | goto del_dead_ctrl; | |
1732 | ||
1733 | ret = nvme_rdma_init_io_queues(ctrl); | |
1734 | if (ret) | |
1735 | goto del_dead_ctrl; | |
1736 | ||
1737 | ret = nvme_rdma_connect_io_queues(ctrl); | |
1738 | if (ret) | |
1739 | goto del_dead_ctrl; | |
1740 | } | |
1741 | ||
1742 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
1743 | WARN_ON_ONCE(!changed); | |
1744 | ||
1745 | if (ctrl->queue_count > 1) { | |
1746 | nvme_start_queues(&ctrl->ctrl); | |
1747 | nvme_queue_scan(&ctrl->ctrl); | |
3ef1b4b2 | 1748 | nvme_queue_async_events(&ctrl->ctrl); |
71102307 CH |
1749 | } |
1750 | ||
1751 | return; | |
1752 | ||
1753 | del_dead_ctrl: | |
1754 | /* Deleting this dead controller... */ | |
1755 | dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); | |
1756 | WARN_ON(!queue_work(nvme_rdma_wq, &ctrl->delete_work)); | |
1757 | } | |
1758 | ||
1759 | static int nvme_rdma_reset_ctrl(struct nvme_ctrl *nctrl) | |
1760 | { | |
1761 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); | |
1762 | ||
1763 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING)) | |
1764 | return -EBUSY; | |
1765 | ||
1766 | if (!queue_work(nvme_rdma_wq, &ctrl->reset_work)) | |
1767 | return -EBUSY; | |
1768 | ||
1769 | flush_work(&ctrl->reset_work); | |
1770 | ||
1771 | return 0; | |
1772 | } | |
1773 | ||
1774 | static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = { | |
1775 | .name = "rdma", | |
1776 | .module = THIS_MODULE, | |
1777 | .is_fabrics = true, | |
1778 | .reg_read32 = nvmf_reg_read32, | |
1779 | .reg_read64 = nvmf_reg_read64, | |
1780 | .reg_write32 = nvmf_reg_write32, | |
1781 | .reset_ctrl = nvme_rdma_reset_ctrl, | |
1782 | .free_ctrl = nvme_rdma_free_ctrl, | |
1783 | .submit_async_event = nvme_rdma_submit_async_event, | |
1784 | .delete_ctrl = nvme_rdma_del_ctrl, | |
1785 | .get_subsysnqn = nvmf_get_subsysnqn, | |
1786 | .get_address = nvmf_get_address, | |
1787 | }; | |
1788 | ||
1789 | static int nvme_rdma_create_io_queues(struct nvme_rdma_ctrl *ctrl) | |
1790 | { | |
1791 | struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; | |
1792 | int ret; | |
1793 | ||
1794 | ret = nvme_set_queue_count(&ctrl->ctrl, &opts->nr_io_queues); | |
1795 | if (ret) | |
1796 | return ret; | |
1797 | ||
1798 | ctrl->queue_count = opts->nr_io_queues + 1; | |
1799 | if (ctrl->queue_count < 2) | |
1800 | return 0; | |
1801 | ||
1802 | dev_info(ctrl->ctrl.device, | |
1803 | "creating %d I/O queues.\n", opts->nr_io_queues); | |
1804 | ||
1805 | ret = nvme_rdma_init_io_queues(ctrl); | |
1806 | if (ret) | |
1807 | return ret; | |
1808 | ||
1809 | /* | |
1810 | * We need a reference on the device as long as the tag_set is alive, | |
1811 | * as the MRs in the request structures need a valid ib_device. | |
1812 | */ | |
1813 | ret = -EINVAL; | |
1814 | if (!nvme_rdma_dev_get(ctrl->device)) | |
1815 | goto out_free_io_queues; | |
1816 | ||
1817 | memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); | |
1818 | ctrl->tag_set.ops = &nvme_rdma_mq_ops; | |
1819 | ctrl->tag_set.queue_depth = ctrl->ctrl.sqsize; | |
1820 | ctrl->tag_set.reserved_tags = 1; /* fabric connect */ | |
1821 | ctrl->tag_set.numa_node = NUMA_NO_NODE; | |
1822 | ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
1823 | ctrl->tag_set.cmd_size = sizeof(struct nvme_rdma_request) + | |
1824 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
1825 | ctrl->tag_set.driver_data = ctrl; | |
1826 | ctrl->tag_set.nr_hw_queues = ctrl->queue_count - 1; | |
1827 | ctrl->tag_set.timeout = NVME_IO_TIMEOUT; | |
1828 | ||
1829 | ret = blk_mq_alloc_tag_set(&ctrl->tag_set); | |
1830 | if (ret) | |
1831 | goto out_put_dev; | |
1832 | ctrl->ctrl.tagset = &ctrl->tag_set; | |
1833 | ||
1834 | ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); | |
1835 | if (IS_ERR(ctrl->ctrl.connect_q)) { | |
1836 | ret = PTR_ERR(ctrl->ctrl.connect_q); | |
1837 | goto out_free_tag_set; | |
1838 | } | |
1839 | ||
1840 | ret = nvme_rdma_connect_io_queues(ctrl); | |
1841 | if (ret) | |
1842 | goto out_cleanup_connect_q; | |
1843 | ||
1844 | return 0; | |
1845 | ||
1846 | out_cleanup_connect_q: | |
1847 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
1848 | out_free_tag_set: | |
1849 | blk_mq_free_tag_set(&ctrl->tag_set); | |
1850 | out_put_dev: | |
1851 | nvme_rdma_dev_put(ctrl->device); | |
1852 | out_free_io_queues: | |
1853 | nvme_rdma_free_io_queues(ctrl); | |
1854 | return ret; | |
1855 | } | |
1856 | ||
1857 | static int nvme_rdma_parse_ipaddr(struct sockaddr_in *in_addr, char *p) | |
1858 | { | |
1859 | u8 *addr = (u8 *)&in_addr->sin_addr.s_addr; | |
1860 | size_t buflen = strlen(p); | |
1861 | ||
1862 | /* XXX: handle IPv6 addresses */ | |
1863 | ||
1864 | if (buflen > INET_ADDRSTRLEN) | |
1865 | return -EINVAL; | |
1866 | if (in4_pton(p, buflen, addr, '\0', NULL) == 0) | |
1867 | return -EINVAL; | |
1868 | in_addr->sin_family = AF_INET; | |
1869 | return 0; | |
1870 | } | |
1871 | ||
1872 | static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev, | |
1873 | struct nvmf_ctrl_options *opts) | |
1874 | { | |
1875 | struct nvme_rdma_ctrl *ctrl; | |
1876 | int ret; | |
1877 | bool changed; | |
1878 | ||
1879 | ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); | |
1880 | if (!ctrl) | |
1881 | return ERR_PTR(-ENOMEM); | |
1882 | ctrl->ctrl.opts = opts; | |
1883 | INIT_LIST_HEAD(&ctrl->list); | |
1884 | ||
1885 | ret = nvme_rdma_parse_ipaddr(&ctrl->addr_in, opts->traddr); | |
1886 | if (ret) { | |
1887 | pr_err("malformed IP address passed: %s\n", opts->traddr); | |
1888 | goto out_free_ctrl; | |
1889 | } | |
1890 | ||
1891 | if (opts->mask & NVMF_OPT_TRSVCID) { | |
1892 | u16 port; | |
1893 | ||
1894 | ret = kstrtou16(opts->trsvcid, 0, &port); | |
1895 | if (ret) | |
1896 | goto out_free_ctrl; | |
1897 | ||
1898 | ctrl->addr_in.sin_port = cpu_to_be16(port); | |
1899 | } else { | |
1900 | ctrl->addr_in.sin_port = cpu_to_be16(NVME_RDMA_IP_PORT); | |
1901 | } | |
1902 | ||
1903 | ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops, | |
1904 | 0 /* no quirks, we're perfect! */); | |
1905 | if (ret) | |
1906 | goto out_free_ctrl; | |
1907 | ||
1908 | ctrl->reconnect_delay = opts->reconnect_delay; | |
1909 | INIT_DELAYED_WORK(&ctrl->reconnect_work, | |
1910 | nvme_rdma_reconnect_ctrl_work); | |
1911 | INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work); | |
1912 | INIT_WORK(&ctrl->delete_work, nvme_rdma_del_ctrl_work); | |
1913 | INIT_WORK(&ctrl->reset_work, nvme_rdma_reset_ctrl_work); | |
1914 | spin_lock_init(&ctrl->lock); | |
1915 | ||
1916 | ctrl->queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */ | |
1917 | ctrl->ctrl.sqsize = opts->queue_size; | |
71102307 CH |
1918 | ctrl->ctrl.kato = opts->kato; |
1919 | ||
1920 | ret = -ENOMEM; | |
1921 | ctrl->queues = kcalloc(ctrl->queue_count, sizeof(*ctrl->queues), | |
1922 | GFP_KERNEL); | |
1923 | if (!ctrl->queues) | |
1924 | goto out_uninit_ctrl; | |
1925 | ||
1926 | ret = nvme_rdma_configure_admin_queue(ctrl); | |
1927 | if (ret) | |
1928 | goto out_kfree_queues; | |
1929 | ||
1930 | /* sanity check icdoff */ | |
1931 | if (ctrl->ctrl.icdoff) { | |
1932 | dev_err(ctrl->ctrl.device, "icdoff is not supported!\n"); | |
1933 | goto out_remove_admin_queue; | |
1934 | } | |
1935 | ||
1936 | /* sanity check keyed sgls */ | |
1937 | if (!(ctrl->ctrl.sgls & (1 << 20))) { | |
1938 | dev_err(ctrl->ctrl.device, "Mandatory keyed sgls are not support\n"); | |
1939 | goto out_remove_admin_queue; | |
1940 | } | |
1941 | ||
1942 | if (opts->queue_size > ctrl->ctrl.maxcmd) { | |
1943 | /* warn if maxcmd is lower than queue_size */ | |
1944 | dev_warn(ctrl->ctrl.device, | |
1945 | "queue_size %zu > ctrl maxcmd %u, clamping down\n", | |
1946 | opts->queue_size, ctrl->ctrl.maxcmd); | |
1947 | opts->queue_size = ctrl->ctrl.maxcmd; | |
1948 | } | |
1949 | ||
1950 | if (opts->nr_io_queues) { | |
1951 | ret = nvme_rdma_create_io_queues(ctrl); | |
1952 | if (ret) | |
1953 | goto out_remove_admin_queue; | |
1954 | } | |
1955 | ||
1956 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
1957 | WARN_ON_ONCE(!changed); | |
1958 | ||
1959 | dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISp\n", | |
1960 | ctrl->ctrl.opts->subsysnqn, &ctrl->addr); | |
1961 | ||
1962 | kref_get(&ctrl->ctrl.kref); | |
1963 | ||
1964 | mutex_lock(&nvme_rdma_ctrl_mutex); | |
1965 | list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list); | |
1966 | mutex_unlock(&nvme_rdma_ctrl_mutex); | |
1967 | ||
1968 | if (opts->nr_io_queues) { | |
1969 | nvme_queue_scan(&ctrl->ctrl); | |
1970 | nvme_queue_async_events(&ctrl->ctrl); | |
1971 | } | |
1972 | ||
1973 | return &ctrl->ctrl; | |
1974 | ||
1975 | out_remove_admin_queue: | |
1976 | nvme_stop_keep_alive(&ctrl->ctrl); | |
1977 | nvme_rdma_destroy_admin_queue(ctrl); | |
1978 | out_kfree_queues: | |
1979 | kfree(ctrl->queues); | |
1980 | out_uninit_ctrl: | |
1981 | nvme_uninit_ctrl(&ctrl->ctrl); | |
1982 | nvme_put_ctrl(&ctrl->ctrl); | |
1983 | if (ret > 0) | |
1984 | ret = -EIO; | |
1985 | return ERR_PTR(ret); | |
1986 | out_free_ctrl: | |
1987 | kfree(ctrl); | |
1988 | return ERR_PTR(ret); | |
1989 | } | |
1990 | ||
1991 | static struct nvmf_transport_ops nvme_rdma_transport = { | |
1992 | .name = "rdma", | |
1993 | .required_opts = NVMF_OPT_TRADDR, | |
2ac17c28 | 1994 | .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY, |
71102307 CH |
1995 | .create_ctrl = nvme_rdma_create_ctrl, |
1996 | }; | |
1997 | ||
1998 | static int __init nvme_rdma_init_module(void) | |
1999 | { | |
2000 | nvme_rdma_wq = create_workqueue("nvme_rdma_wq"); | |
2001 | if (!nvme_rdma_wq) | |
2002 | return -ENOMEM; | |
2003 | ||
2004 | nvmf_register_transport(&nvme_rdma_transport); | |
2005 | return 0; | |
2006 | } | |
2007 | ||
2008 | static void __exit nvme_rdma_cleanup_module(void) | |
2009 | { | |
2010 | struct nvme_rdma_ctrl *ctrl; | |
2011 | ||
2012 | nvmf_unregister_transport(&nvme_rdma_transport); | |
2013 | ||
2014 | mutex_lock(&nvme_rdma_ctrl_mutex); | |
2015 | list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) | |
2016 | __nvme_rdma_del_ctrl(ctrl); | |
2017 | mutex_unlock(&nvme_rdma_ctrl_mutex); | |
2018 | ||
2019 | destroy_workqueue(nvme_rdma_wq); | |
2020 | } | |
2021 | ||
2022 | module_init(nvme_rdma_init_module); | |
2023 | module_exit(nvme_rdma_cleanup_module); | |
2024 | ||
2025 | MODULE_LICENSE("GPL v2"); |