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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 | ||
71102307 CH |
46 | /* |
47 | * We handle AEN commands ourselves and don't even let the | |
48 | * block layer know about them. | |
49 | */ | |
50 | #define NVME_RDMA_NR_AEN_COMMANDS 1 | |
51 | #define NVME_RDMA_AQ_BLKMQ_DEPTH \ | |
52 | (NVMF_AQ_DEPTH - NVME_RDMA_NR_AEN_COMMANDS) | |
53 | ||
54 | struct nvme_rdma_device { | |
55 | struct ib_device *dev; | |
56 | struct ib_pd *pd; | |
57 | struct ib_mr *mr; | |
58 | struct kref ref; | |
59 | struct list_head entry; | |
60 | }; | |
61 | ||
62 | struct nvme_rdma_qe { | |
63 | struct ib_cqe cqe; | |
64 | void *data; | |
65 | u64 dma; | |
66 | }; | |
67 | ||
68 | struct nvme_rdma_queue; | |
69 | struct nvme_rdma_request { | |
70 | struct ib_mr *mr; | |
71 | struct nvme_rdma_qe sqe; | |
72 | struct ib_sge sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS]; | |
73 | u32 num_sge; | |
74 | int nents; | |
75 | bool inline_data; | |
71102307 CH |
76 | struct ib_reg_wr reg_wr; |
77 | struct ib_cqe reg_cqe; | |
78 | struct nvme_rdma_queue *queue; | |
79 | struct sg_table sg_table; | |
80 | struct scatterlist first_sgl[]; | |
81 | }; | |
82 | ||
83 | enum nvme_rdma_queue_flags { | |
84 | NVME_RDMA_Q_CONNECTED = (1 << 0), | |
85 | }; | |
86 | ||
87 | struct nvme_rdma_queue { | |
88 | struct nvme_rdma_qe *rsp_ring; | |
89 | u8 sig_count; | |
90 | int queue_size; | |
91 | size_t cmnd_capsule_len; | |
92 | struct nvme_rdma_ctrl *ctrl; | |
93 | struct nvme_rdma_device *device; | |
94 | struct ib_cq *ib_cq; | |
95 | struct ib_qp *qp; | |
96 | ||
97 | unsigned long flags; | |
98 | struct rdma_cm_id *cm_id; | |
99 | int cm_error; | |
100 | struct completion cm_done; | |
101 | }; | |
102 | ||
103 | struct nvme_rdma_ctrl { | |
104 | /* read and written in the hot path */ | |
105 | spinlock_t lock; | |
106 | ||
107 | /* read only in the hot path */ | |
108 | struct nvme_rdma_queue *queues; | |
109 | u32 queue_count; | |
110 | ||
111 | /* other member variables */ | |
71102307 CH |
112 | struct blk_mq_tag_set tag_set; |
113 | struct work_struct delete_work; | |
114 | struct work_struct reset_work; | |
115 | struct work_struct err_work; | |
116 | ||
117 | struct nvme_rdma_qe async_event_sqe; | |
118 | ||
119 | int reconnect_delay; | |
120 | struct delayed_work reconnect_work; | |
121 | ||
122 | struct list_head list; | |
123 | ||
124 | struct blk_mq_tag_set admin_tag_set; | |
125 | struct nvme_rdma_device *device; | |
126 | ||
127 | u64 cap; | |
128 | u32 max_fr_pages; | |
129 | ||
130 | union { | |
131 | struct sockaddr addr; | |
132 | struct sockaddr_in addr_in; | |
133 | }; | |
134 | ||
135 | struct nvme_ctrl ctrl; | |
136 | }; | |
137 | ||
138 | static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl) | |
139 | { | |
140 | return container_of(ctrl, struct nvme_rdma_ctrl, ctrl); | |
141 | } | |
142 | ||
143 | static LIST_HEAD(device_list); | |
144 | static DEFINE_MUTEX(device_list_mutex); | |
145 | ||
146 | static LIST_HEAD(nvme_rdma_ctrl_list); | |
147 | static DEFINE_MUTEX(nvme_rdma_ctrl_mutex); | |
148 | ||
149 | static struct workqueue_struct *nvme_rdma_wq; | |
150 | ||
151 | /* | |
152 | * Disabling this option makes small I/O goes faster, but is fundamentally | |
153 | * unsafe. With it turned off we will have to register a global rkey that | |
154 | * allows read and write access to all physical memory. | |
155 | */ | |
156 | static bool register_always = true; | |
157 | module_param(register_always, bool, 0444); | |
158 | MODULE_PARM_DESC(register_always, | |
159 | "Use memory registration even for contiguous memory regions"); | |
160 | ||
161 | static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, | |
162 | struct rdma_cm_event *event); | |
163 | static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc); | |
71102307 CH |
164 | |
165 | /* XXX: really should move to a generic header sooner or later.. */ | |
166 | static inline void put_unaligned_le24(u32 val, u8 *p) | |
167 | { | |
168 | *p++ = val; | |
169 | *p++ = val >> 8; | |
170 | *p++ = val >> 16; | |
171 | } | |
172 | ||
173 | static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue) | |
174 | { | |
175 | return queue - queue->ctrl->queues; | |
176 | } | |
177 | ||
178 | static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue) | |
179 | { | |
180 | return queue->cmnd_capsule_len - sizeof(struct nvme_command); | |
181 | } | |
182 | ||
183 | static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe, | |
184 | size_t capsule_size, enum dma_data_direction dir) | |
185 | { | |
186 | ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir); | |
187 | kfree(qe->data); | |
188 | } | |
189 | ||
190 | static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe, | |
191 | size_t capsule_size, enum dma_data_direction dir) | |
192 | { | |
193 | qe->data = kzalloc(capsule_size, GFP_KERNEL); | |
194 | if (!qe->data) | |
195 | return -ENOMEM; | |
196 | ||
197 | qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir); | |
198 | if (ib_dma_mapping_error(ibdev, qe->dma)) { | |
199 | kfree(qe->data); | |
200 | return -ENOMEM; | |
201 | } | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static void nvme_rdma_free_ring(struct ib_device *ibdev, | |
207 | struct nvme_rdma_qe *ring, size_t ib_queue_size, | |
208 | size_t capsule_size, enum dma_data_direction dir) | |
209 | { | |
210 | int i; | |
211 | ||
212 | for (i = 0; i < ib_queue_size; i++) | |
213 | nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir); | |
214 | kfree(ring); | |
215 | } | |
216 | ||
217 | static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev, | |
218 | size_t ib_queue_size, size_t capsule_size, | |
219 | enum dma_data_direction dir) | |
220 | { | |
221 | struct nvme_rdma_qe *ring; | |
222 | int i; | |
223 | ||
224 | ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL); | |
225 | if (!ring) | |
226 | return NULL; | |
227 | ||
228 | for (i = 0; i < ib_queue_size; i++) { | |
229 | if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir)) | |
230 | goto out_free_ring; | |
231 | } | |
232 | ||
233 | return ring; | |
234 | ||
235 | out_free_ring: | |
236 | nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir); | |
237 | return NULL; | |
238 | } | |
239 | ||
240 | static void nvme_rdma_qp_event(struct ib_event *event, void *context) | |
241 | { | |
242 | pr_debug("QP event %d\n", event->event); | |
243 | } | |
244 | ||
245 | static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue) | |
246 | { | |
247 | wait_for_completion_interruptible_timeout(&queue->cm_done, | |
248 | msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1); | |
249 | return queue->cm_error; | |
250 | } | |
251 | ||
252 | static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor) | |
253 | { | |
254 | struct nvme_rdma_device *dev = queue->device; | |
255 | struct ib_qp_init_attr init_attr; | |
256 | int ret; | |
257 | ||
258 | memset(&init_attr, 0, sizeof(init_attr)); | |
259 | init_attr.event_handler = nvme_rdma_qp_event; | |
260 | /* +1 for drain */ | |
261 | init_attr.cap.max_send_wr = factor * queue->queue_size + 1; | |
262 | /* +1 for drain */ | |
263 | init_attr.cap.max_recv_wr = queue->queue_size + 1; | |
264 | init_attr.cap.max_recv_sge = 1; | |
265 | init_attr.cap.max_send_sge = 1 + NVME_RDMA_MAX_INLINE_SEGMENTS; | |
266 | init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
267 | init_attr.qp_type = IB_QPT_RC; | |
268 | init_attr.send_cq = queue->ib_cq; | |
269 | init_attr.recv_cq = queue->ib_cq; | |
270 | ||
271 | ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr); | |
272 | ||
273 | queue->qp = queue->cm_id->qp; | |
274 | return ret; | |
275 | } | |
276 | ||
277 | static int nvme_rdma_reinit_request(void *data, struct request *rq) | |
278 | { | |
279 | struct nvme_rdma_ctrl *ctrl = data; | |
280 | struct nvme_rdma_device *dev = ctrl->device; | |
281 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
282 | int ret = 0; | |
283 | ||
f5b7b559 | 284 | if (!req->mr->need_inval) |
71102307 CH |
285 | goto out; |
286 | ||
287 | ib_dereg_mr(req->mr); | |
288 | ||
289 | req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG, | |
290 | ctrl->max_fr_pages); | |
291 | if (IS_ERR(req->mr)) { | |
71102307 | 292 | ret = PTR_ERR(req->mr); |
458a9632 | 293 | req->mr = NULL; |
71102307 CH |
294 | } |
295 | ||
f5b7b559 | 296 | req->mr->need_inval = false; |
71102307 CH |
297 | |
298 | out: | |
299 | return ret; | |
300 | } | |
301 | ||
302 | static void __nvme_rdma_exit_request(struct nvme_rdma_ctrl *ctrl, | |
303 | struct request *rq, unsigned int queue_idx) | |
304 | { | |
305 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
306 | struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx]; | |
307 | struct nvme_rdma_device *dev = queue->device; | |
308 | ||
309 | if (req->mr) | |
310 | ib_dereg_mr(req->mr); | |
311 | ||
312 | nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command), | |
313 | DMA_TO_DEVICE); | |
314 | } | |
315 | ||
316 | static void nvme_rdma_exit_request(void *data, struct request *rq, | |
317 | unsigned int hctx_idx, unsigned int rq_idx) | |
318 | { | |
319 | return __nvme_rdma_exit_request(data, rq, hctx_idx + 1); | |
320 | } | |
321 | ||
322 | static void nvme_rdma_exit_admin_request(void *data, struct request *rq, | |
323 | unsigned int hctx_idx, unsigned int rq_idx) | |
324 | { | |
325 | return __nvme_rdma_exit_request(data, rq, 0); | |
326 | } | |
327 | ||
328 | static int __nvme_rdma_init_request(struct nvme_rdma_ctrl *ctrl, | |
329 | struct request *rq, unsigned int queue_idx) | |
330 | { | |
331 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
332 | struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx]; | |
333 | struct nvme_rdma_device *dev = queue->device; | |
334 | struct ib_device *ibdev = dev->dev; | |
335 | int ret; | |
336 | ||
337 | BUG_ON(queue_idx >= ctrl->queue_count); | |
338 | ||
339 | ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command), | |
340 | DMA_TO_DEVICE); | |
341 | if (ret) | |
342 | return ret; | |
343 | ||
344 | req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG, | |
345 | ctrl->max_fr_pages); | |
346 | if (IS_ERR(req->mr)) { | |
347 | ret = PTR_ERR(req->mr); | |
348 | goto out_free_qe; | |
349 | } | |
350 | ||
351 | req->queue = queue; | |
352 | ||
353 | return 0; | |
354 | ||
355 | out_free_qe: | |
356 | nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command), | |
357 | DMA_TO_DEVICE); | |
358 | return -ENOMEM; | |
359 | } | |
360 | ||
361 | static int nvme_rdma_init_request(void *data, struct request *rq, | |
362 | unsigned int hctx_idx, unsigned int rq_idx, | |
363 | unsigned int numa_node) | |
364 | { | |
365 | return __nvme_rdma_init_request(data, rq, hctx_idx + 1); | |
366 | } | |
367 | ||
368 | static int nvme_rdma_init_admin_request(void *data, struct request *rq, | |
369 | unsigned int hctx_idx, unsigned int rq_idx, | |
370 | unsigned int numa_node) | |
371 | { | |
372 | return __nvme_rdma_init_request(data, rq, 0); | |
373 | } | |
374 | ||
375 | static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
376 | unsigned int hctx_idx) | |
377 | { | |
378 | struct nvme_rdma_ctrl *ctrl = data; | |
379 | struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1]; | |
380 | ||
381 | BUG_ON(hctx_idx >= ctrl->queue_count); | |
382 | ||
383 | hctx->driver_data = queue; | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
388 | unsigned int hctx_idx) | |
389 | { | |
390 | struct nvme_rdma_ctrl *ctrl = data; | |
391 | struct nvme_rdma_queue *queue = &ctrl->queues[0]; | |
392 | ||
393 | BUG_ON(hctx_idx != 0); | |
394 | ||
395 | hctx->driver_data = queue; | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static void nvme_rdma_free_dev(struct kref *ref) | |
400 | { | |
401 | struct nvme_rdma_device *ndev = | |
402 | container_of(ref, struct nvme_rdma_device, ref); | |
403 | ||
404 | mutex_lock(&device_list_mutex); | |
405 | list_del(&ndev->entry); | |
406 | mutex_unlock(&device_list_mutex); | |
407 | ||
408 | if (!register_always) | |
409 | ib_dereg_mr(ndev->mr); | |
410 | ib_dealloc_pd(ndev->pd); | |
411 | ||
412 | kfree(ndev); | |
413 | } | |
414 | ||
415 | static void nvme_rdma_dev_put(struct nvme_rdma_device *dev) | |
416 | { | |
417 | kref_put(&dev->ref, nvme_rdma_free_dev); | |
418 | } | |
419 | ||
420 | static int nvme_rdma_dev_get(struct nvme_rdma_device *dev) | |
421 | { | |
422 | return kref_get_unless_zero(&dev->ref); | |
423 | } | |
424 | ||
425 | static struct nvme_rdma_device * | |
426 | nvme_rdma_find_get_device(struct rdma_cm_id *cm_id) | |
427 | { | |
428 | struct nvme_rdma_device *ndev; | |
429 | ||
430 | mutex_lock(&device_list_mutex); | |
431 | list_for_each_entry(ndev, &device_list, entry) { | |
432 | if (ndev->dev->node_guid == cm_id->device->node_guid && | |
433 | nvme_rdma_dev_get(ndev)) | |
434 | goto out_unlock; | |
435 | } | |
436 | ||
437 | ndev = kzalloc(sizeof(*ndev), GFP_KERNEL); | |
438 | if (!ndev) | |
439 | goto out_err; | |
440 | ||
441 | ndev->dev = cm_id->device; | |
442 | kref_init(&ndev->ref); | |
443 | ||
444 | ndev->pd = ib_alloc_pd(ndev->dev); | |
445 | if (IS_ERR(ndev->pd)) | |
446 | goto out_free_dev; | |
447 | ||
448 | if (!register_always) { | |
449 | ndev->mr = ib_get_dma_mr(ndev->pd, | |
450 | IB_ACCESS_LOCAL_WRITE | | |
451 | IB_ACCESS_REMOTE_READ | | |
452 | IB_ACCESS_REMOTE_WRITE); | |
453 | if (IS_ERR(ndev->mr)) | |
454 | goto out_free_pd; | |
455 | } | |
456 | ||
457 | if (!(ndev->dev->attrs.device_cap_flags & | |
458 | IB_DEVICE_MEM_MGT_EXTENSIONS)) { | |
459 | dev_err(&ndev->dev->dev, | |
460 | "Memory registrations not supported.\n"); | |
461 | goto out_free_mr; | |
462 | } | |
463 | ||
464 | list_add(&ndev->entry, &device_list); | |
465 | out_unlock: | |
466 | mutex_unlock(&device_list_mutex); | |
467 | return ndev; | |
468 | ||
469 | out_free_mr: | |
470 | if (!register_always) | |
471 | ib_dereg_mr(ndev->mr); | |
472 | out_free_pd: | |
473 | ib_dealloc_pd(ndev->pd); | |
474 | out_free_dev: | |
475 | kfree(ndev); | |
476 | out_err: | |
477 | mutex_unlock(&device_list_mutex); | |
478 | return NULL; | |
479 | } | |
480 | ||
481 | static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue) | |
482 | { | |
483 | struct nvme_rdma_device *dev = queue->device; | |
484 | struct ib_device *ibdev = dev->dev; | |
485 | ||
486 | rdma_destroy_qp(queue->cm_id); | |
487 | ib_free_cq(queue->ib_cq); | |
488 | ||
489 | nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size, | |
490 | sizeof(struct nvme_completion), DMA_FROM_DEVICE); | |
491 | ||
492 | nvme_rdma_dev_put(dev); | |
493 | } | |
494 | ||
495 | static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue, | |
496 | struct nvme_rdma_device *dev) | |
497 | { | |
498 | struct ib_device *ibdev = dev->dev; | |
499 | const int send_wr_factor = 3; /* MR, SEND, INV */ | |
500 | const int cq_factor = send_wr_factor + 1; /* + RECV */ | |
501 | int comp_vector, idx = nvme_rdma_queue_idx(queue); | |
502 | ||
503 | int ret; | |
504 | ||
505 | queue->device = dev; | |
506 | ||
507 | /* | |
508 | * The admin queue is barely used once the controller is live, so don't | |
509 | * bother to spread it out. | |
510 | */ | |
511 | if (idx == 0) | |
512 | comp_vector = 0; | |
513 | else | |
514 | comp_vector = idx % ibdev->num_comp_vectors; | |
515 | ||
516 | ||
517 | /* +1 for ib_stop_cq */ | |
518 | queue->ib_cq = ib_alloc_cq(dev->dev, queue, | |
519 | cq_factor * queue->queue_size + 1, comp_vector, | |
520 | IB_POLL_SOFTIRQ); | |
521 | if (IS_ERR(queue->ib_cq)) { | |
522 | ret = PTR_ERR(queue->ib_cq); | |
523 | goto out; | |
524 | } | |
525 | ||
526 | ret = nvme_rdma_create_qp(queue, send_wr_factor); | |
527 | if (ret) | |
528 | goto out_destroy_ib_cq; | |
529 | ||
530 | queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size, | |
531 | sizeof(struct nvme_completion), DMA_FROM_DEVICE); | |
532 | if (!queue->rsp_ring) { | |
533 | ret = -ENOMEM; | |
534 | goto out_destroy_qp; | |
535 | } | |
536 | ||
537 | return 0; | |
538 | ||
539 | out_destroy_qp: | |
540 | ib_destroy_qp(queue->qp); | |
541 | out_destroy_ib_cq: | |
542 | ib_free_cq(queue->ib_cq); | |
543 | out: | |
544 | return ret; | |
545 | } | |
546 | ||
547 | static int nvme_rdma_init_queue(struct nvme_rdma_ctrl *ctrl, | |
548 | int idx, size_t queue_size) | |
549 | { | |
550 | struct nvme_rdma_queue *queue; | |
551 | int ret; | |
552 | ||
553 | queue = &ctrl->queues[idx]; | |
554 | queue->ctrl = ctrl; | |
555 | init_completion(&queue->cm_done); | |
556 | ||
557 | if (idx > 0) | |
558 | queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16; | |
559 | else | |
560 | queue->cmnd_capsule_len = sizeof(struct nvme_command); | |
561 | ||
562 | queue->queue_size = queue_size; | |
563 | ||
564 | queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue, | |
565 | RDMA_PS_TCP, IB_QPT_RC); | |
566 | if (IS_ERR(queue->cm_id)) { | |
567 | dev_info(ctrl->ctrl.device, | |
568 | "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id)); | |
569 | return PTR_ERR(queue->cm_id); | |
570 | } | |
571 | ||
572 | queue->cm_error = -ETIMEDOUT; | |
573 | ret = rdma_resolve_addr(queue->cm_id, NULL, &ctrl->addr, | |
574 | NVME_RDMA_CONNECT_TIMEOUT_MS); | |
575 | if (ret) { | |
576 | dev_info(ctrl->ctrl.device, | |
577 | "rdma_resolve_addr failed (%d).\n", ret); | |
578 | goto out_destroy_cm_id; | |
579 | } | |
580 | ||
581 | ret = nvme_rdma_wait_for_cm(queue); | |
582 | if (ret) { | |
583 | dev_info(ctrl->ctrl.device, | |
584 | "rdma_resolve_addr wait failed (%d).\n", ret); | |
585 | goto out_destroy_cm_id; | |
586 | } | |
587 | ||
588 | set_bit(NVME_RDMA_Q_CONNECTED, &queue->flags); | |
589 | ||
590 | return 0; | |
591 | ||
592 | out_destroy_cm_id: | |
593 | rdma_destroy_id(queue->cm_id); | |
594 | return ret; | |
595 | } | |
596 | ||
597 | static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue) | |
598 | { | |
599 | rdma_disconnect(queue->cm_id); | |
600 | ib_drain_qp(queue->qp); | |
601 | } | |
602 | ||
603 | static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue) | |
604 | { | |
605 | nvme_rdma_destroy_queue_ib(queue); | |
606 | rdma_destroy_id(queue->cm_id); | |
607 | } | |
608 | ||
609 | static void nvme_rdma_stop_and_free_queue(struct nvme_rdma_queue *queue) | |
610 | { | |
611 | if (!test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags)) | |
612 | return; | |
613 | nvme_rdma_stop_queue(queue); | |
614 | nvme_rdma_free_queue(queue); | |
615 | } | |
616 | ||
617 | static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl) | |
618 | { | |
619 | int i; | |
620 | ||
621 | for (i = 1; i < ctrl->queue_count; i++) | |
622 | nvme_rdma_stop_and_free_queue(&ctrl->queues[i]); | |
623 | } | |
624 | ||
625 | static int nvme_rdma_connect_io_queues(struct nvme_rdma_ctrl *ctrl) | |
626 | { | |
627 | int i, ret = 0; | |
628 | ||
629 | for (i = 1; i < ctrl->queue_count; i++) { | |
630 | ret = nvmf_connect_io_queue(&ctrl->ctrl, i); | |
631 | if (ret) | |
632 | break; | |
633 | } | |
634 | ||
635 | return ret; | |
636 | } | |
637 | ||
638 | static int nvme_rdma_init_io_queues(struct nvme_rdma_ctrl *ctrl) | |
639 | { | |
640 | int i, ret; | |
641 | ||
642 | for (i = 1; i < ctrl->queue_count; i++) { | |
c5af8654 JF |
643 | ret = nvme_rdma_init_queue(ctrl, i, |
644 | ctrl->ctrl.opts->queue_size); | |
71102307 CH |
645 | if (ret) { |
646 | dev_info(ctrl->ctrl.device, | |
647 | "failed to initialize i/o queue: %d\n", ret); | |
648 | goto out_free_queues; | |
649 | } | |
650 | } | |
651 | ||
652 | return 0; | |
653 | ||
654 | out_free_queues: | |
655 | for (; i >= 1; i--) | |
656 | nvme_rdma_stop_and_free_queue(&ctrl->queues[i]); | |
657 | ||
658 | return ret; | |
659 | } | |
660 | ||
661 | static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl) | |
662 | { | |
663 | nvme_rdma_free_qe(ctrl->queues[0].device->dev, &ctrl->async_event_sqe, | |
664 | sizeof(struct nvme_command), DMA_TO_DEVICE); | |
665 | nvme_rdma_stop_and_free_queue(&ctrl->queues[0]); | |
666 | blk_cleanup_queue(ctrl->ctrl.admin_q); | |
667 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
668 | nvme_rdma_dev_put(ctrl->device); | |
669 | } | |
670 | ||
671 | static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl) | |
672 | { | |
673 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); | |
674 | ||
675 | if (list_empty(&ctrl->list)) | |
676 | goto free_ctrl; | |
677 | ||
678 | mutex_lock(&nvme_rdma_ctrl_mutex); | |
679 | list_del(&ctrl->list); | |
680 | mutex_unlock(&nvme_rdma_ctrl_mutex); | |
681 | ||
71102307 CH |
682 | kfree(ctrl->queues); |
683 | nvmf_free_options(nctrl->opts); | |
684 | free_ctrl: | |
685 | kfree(ctrl); | |
686 | } | |
687 | ||
688 | static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work) | |
689 | { | |
690 | struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work), | |
691 | struct nvme_rdma_ctrl, reconnect_work); | |
692 | bool changed; | |
693 | int ret; | |
694 | ||
695 | if (ctrl->queue_count > 1) { | |
696 | nvme_rdma_free_io_queues(ctrl); | |
697 | ||
698 | ret = blk_mq_reinit_tagset(&ctrl->tag_set); | |
699 | if (ret) | |
700 | goto requeue; | |
701 | } | |
702 | ||
703 | nvme_rdma_stop_and_free_queue(&ctrl->queues[0]); | |
704 | ||
705 | ret = blk_mq_reinit_tagset(&ctrl->admin_tag_set); | |
706 | if (ret) | |
707 | goto requeue; | |
708 | ||
709 | ret = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH); | |
710 | if (ret) | |
711 | goto requeue; | |
712 | ||
713 | blk_mq_start_stopped_hw_queues(ctrl->ctrl.admin_q, true); | |
714 | ||
715 | ret = nvmf_connect_admin_queue(&ctrl->ctrl); | |
716 | if (ret) | |
717 | goto stop_admin_q; | |
718 | ||
719 | ret = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap); | |
720 | if (ret) | |
721 | goto stop_admin_q; | |
722 | ||
723 | nvme_start_keep_alive(&ctrl->ctrl); | |
724 | ||
725 | if (ctrl->queue_count > 1) { | |
726 | ret = nvme_rdma_init_io_queues(ctrl); | |
727 | if (ret) | |
728 | goto stop_admin_q; | |
729 | ||
730 | ret = nvme_rdma_connect_io_queues(ctrl); | |
731 | if (ret) | |
732 | goto stop_admin_q; | |
733 | } | |
734 | ||
735 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
736 | WARN_ON_ONCE(!changed); | |
737 | ||
5f372eb3 | 738 | if (ctrl->queue_count > 1) { |
71102307 | 739 | nvme_start_queues(&ctrl->ctrl); |
5f372eb3 | 740 | nvme_queue_scan(&ctrl->ctrl); |
3ef1b4b2 | 741 | nvme_queue_async_events(&ctrl->ctrl); |
5f372eb3 | 742 | } |
71102307 CH |
743 | |
744 | dev_info(ctrl->ctrl.device, "Successfully reconnected\n"); | |
745 | ||
746 | return; | |
747 | ||
748 | stop_admin_q: | |
749 | blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); | |
750 | requeue: | |
751 | /* Make sure we are not resetting/deleting */ | |
752 | if (ctrl->ctrl.state == NVME_CTRL_RECONNECTING) { | |
753 | dev_info(ctrl->ctrl.device, | |
754 | "Failed reconnect attempt, requeueing...\n"); | |
755 | queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work, | |
756 | ctrl->reconnect_delay * HZ); | |
757 | } | |
758 | } | |
759 | ||
760 | static void nvme_rdma_error_recovery_work(struct work_struct *work) | |
761 | { | |
762 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
763 | struct nvme_rdma_ctrl, err_work); | |
764 | ||
765 | nvme_stop_keep_alive(&ctrl->ctrl); | |
766 | if (ctrl->queue_count > 1) | |
767 | nvme_stop_queues(&ctrl->ctrl); | |
768 | blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); | |
769 | ||
770 | /* We must take care of fastfail/requeue all our inflight requests */ | |
771 | if (ctrl->queue_count > 1) | |
772 | blk_mq_tagset_busy_iter(&ctrl->tag_set, | |
773 | nvme_cancel_request, &ctrl->ctrl); | |
774 | blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, | |
775 | nvme_cancel_request, &ctrl->ctrl); | |
776 | ||
777 | dev_info(ctrl->ctrl.device, "reconnecting in %d seconds\n", | |
778 | ctrl->reconnect_delay); | |
779 | ||
780 | queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work, | |
781 | ctrl->reconnect_delay * HZ); | |
782 | } | |
783 | ||
784 | static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl) | |
785 | { | |
786 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) | |
787 | return; | |
788 | ||
789 | queue_work(nvme_rdma_wq, &ctrl->err_work); | |
790 | } | |
791 | ||
792 | static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc, | |
793 | const char *op) | |
794 | { | |
795 | struct nvme_rdma_queue *queue = cq->cq_context; | |
796 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
797 | ||
798 | if (ctrl->ctrl.state == NVME_CTRL_LIVE) | |
799 | dev_info(ctrl->ctrl.device, | |
800 | "%s for CQE 0x%p failed with status %s (%d)\n", | |
801 | op, wc->wr_cqe, | |
802 | ib_wc_status_msg(wc->status), wc->status); | |
803 | nvme_rdma_error_recovery(ctrl); | |
804 | } | |
805 | ||
806 | static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc) | |
807 | { | |
808 | if (unlikely(wc->status != IB_WC_SUCCESS)) | |
809 | nvme_rdma_wr_error(cq, wc, "MEMREG"); | |
810 | } | |
811 | ||
812 | static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc) | |
813 | { | |
814 | if (unlikely(wc->status != IB_WC_SUCCESS)) | |
815 | nvme_rdma_wr_error(cq, wc, "LOCAL_INV"); | |
816 | } | |
817 | ||
818 | static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue, | |
819 | struct nvme_rdma_request *req) | |
820 | { | |
821 | struct ib_send_wr *bad_wr; | |
822 | struct ib_send_wr wr = { | |
823 | .opcode = IB_WR_LOCAL_INV, | |
824 | .next = NULL, | |
825 | .num_sge = 0, | |
826 | .send_flags = 0, | |
827 | .ex.invalidate_rkey = req->mr->rkey, | |
828 | }; | |
829 | ||
830 | req->reg_cqe.done = nvme_rdma_inv_rkey_done; | |
831 | wr.wr_cqe = &req->reg_cqe; | |
832 | ||
833 | return ib_post_send(queue->qp, &wr, &bad_wr); | |
834 | } | |
835 | ||
836 | static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue, | |
837 | struct request *rq) | |
838 | { | |
839 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
840 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
841 | struct nvme_rdma_device *dev = queue->device; | |
842 | struct ib_device *ibdev = dev->dev; | |
843 | int res; | |
844 | ||
845 | if (!blk_rq_bytes(rq)) | |
846 | return; | |
847 | ||
f5b7b559 | 848 | if (req->mr->need_inval) { |
71102307 CH |
849 | res = nvme_rdma_inv_rkey(queue, req); |
850 | if (res < 0) { | |
851 | dev_err(ctrl->ctrl.device, | |
852 | "Queueing INV WR for rkey %#x failed (%d)\n", | |
853 | req->mr->rkey, res); | |
854 | nvme_rdma_error_recovery(queue->ctrl); | |
855 | } | |
856 | } | |
857 | ||
858 | ib_dma_unmap_sg(ibdev, req->sg_table.sgl, | |
859 | req->nents, rq_data_dir(rq) == | |
860 | WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
861 | ||
862 | nvme_cleanup_cmd(rq); | |
863 | sg_free_table_chained(&req->sg_table, true); | |
864 | } | |
865 | ||
866 | static int nvme_rdma_set_sg_null(struct nvme_command *c) | |
867 | { | |
868 | struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; | |
869 | ||
870 | sg->addr = 0; | |
871 | put_unaligned_le24(0, sg->length); | |
872 | put_unaligned_le32(0, sg->key); | |
873 | sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4; | |
874 | return 0; | |
875 | } | |
876 | ||
877 | static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue, | |
878 | struct nvme_rdma_request *req, struct nvme_command *c) | |
879 | { | |
880 | struct nvme_sgl_desc *sg = &c->common.dptr.sgl; | |
881 | ||
882 | req->sge[1].addr = sg_dma_address(req->sg_table.sgl); | |
883 | req->sge[1].length = sg_dma_len(req->sg_table.sgl); | |
884 | req->sge[1].lkey = queue->device->pd->local_dma_lkey; | |
885 | ||
886 | sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff); | |
887 | sg->length = cpu_to_le32(sg_dma_len(req->sg_table.sgl)); | |
888 | sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET; | |
889 | ||
890 | req->inline_data = true; | |
891 | req->num_sge++; | |
892 | return 0; | |
893 | } | |
894 | ||
895 | static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue, | |
896 | struct nvme_rdma_request *req, struct nvme_command *c) | |
897 | { | |
898 | struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; | |
899 | ||
900 | sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl)); | |
901 | put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length); | |
902 | put_unaligned_le32(queue->device->mr->rkey, sg->key); | |
903 | sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4; | |
904 | return 0; | |
905 | } | |
906 | ||
907 | static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue, | |
908 | struct nvme_rdma_request *req, struct nvme_command *c, | |
909 | int count) | |
910 | { | |
911 | struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; | |
912 | int nr; | |
913 | ||
914 | nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, PAGE_SIZE); | |
915 | if (nr < count) { | |
916 | if (nr < 0) | |
917 | return nr; | |
918 | return -EINVAL; | |
919 | } | |
920 | ||
921 | ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey)); | |
922 | ||
923 | req->reg_cqe.done = nvme_rdma_memreg_done; | |
924 | memset(&req->reg_wr, 0, sizeof(req->reg_wr)); | |
925 | req->reg_wr.wr.opcode = IB_WR_REG_MR; | |
926 | req->reg_wr.wr.wr_cqe = &req->reg_cqe; | |
927 | req->reg_wr.wr.num_sge = 0; | |
928 | req->reg_wr.mr = req->mr; | |
929 | req->reg_wr.key = req->mr->rkey; | |
930 | req->reg_wr.access = IB_ACCESS_LOCAL_WRITE | | |
931 | IB_ACCESS_REMOTE_READ | | |
932 | IB_ACCESS_REMOTE_WRITE; | |
933 | ||
f5b7b559 | 934 | req->mr->need_inval = true; |
71102307 CH |
935 | |
936 | sg->addr = cpu_to_le64(req->mr->iova); | |
937 | put_unaligned_le24(req->mr->length, sg->length); | |
938 | put_unaligned_le32(req->mr->rkey, sg->key); | |
939 | sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) | | |
940 | NVME_SGL_FMT_INVALIDATE; | |
941 | ||
942 | return 0; | |
943 | } | |
944 | ||
945 | static int nvme_rdma_map_data(struct nvme_rdma_queue *queue, | |
946 | struct request *rq, unsigned int map_len, | |
947 | struct nvme_command *c) | |
948 | { | |
949 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
950 | struct nvme_rdma_device *dev = queue->device; | |
951 | struct ib_device *ibdev = dev->dev; | |
952 | int nents, count; | |
953 | int ret; | |
954 | ||
955 | req->num_sge = 1; | |
956 | req->inline_data = false; | |
f5b7b559 | 957 | req->mr->need_inval = false; |
71102307 CH |
958 | |
959 | c->common.flags |= NVME_CMD_SGL_METABUF; | |
960 | ||
961 | if (!blk_rq_bytes(rq)) | |
962 | return nvme_rdma_set_sg_null(c); | |
963 | ||
964 | req->sg_table.sgl = req->first_sgl; | |
965 | ret = sg_alloc_table_chained(&req->sg_table, rq->nr_phys_segments, | |
966 | req->sg_table.sgl); | |
967 | if (ret) | |
968 | return -ENOMEM; | |
969 | ||
970 | nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl); | |
971 | BUG_ON(nents > rq->nr_phys_segments); | |
972 | req->nents = nents; | |
973 | ||
974 | count = ib_dma_map_sg(ibdev, req->sg_table.sgl, nents, | |
975 | rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
976 | if (unlikely(count <= 0)) { | |
977 | sg_free_table_chained(&req->sg_table, true); | |
978 | return -EIO; | |
979 | } | |
980 | ||
981 | if (count == 1) { | |
982 | if (rq_data_dir(rq) == WRITE && | |
983 | map_len <= nvme_rdma_inline_data_size(queue) && | |
984 | nvme_rdma_queue_idx(queue)) | |
985 | return nvme_rdma_map_sg_inline(queue, req, c); | |
986 | ||
987 | if (!register_always) | |
988 | return nvme_rdma_map_sg_single(queue, req, c); | |
989 | } | |
990 | ||
991 | return nvme_rdma_map_sg_fr(queue, req, c, count); | |
992 | } | |
993 | ||
994 | static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) | |
995 | { | |
996 | if (unlikely(wc->status != IB_WC_SUCCESS)) | |
997 | nvme_rdma_wr_error(cq, wc, "SEND"); | |
998 | } | |
999 | ||
1000 | static int nvme_rdma_post_send(struct nvme_rdma_queue *queue, | |
1001 | struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge, | |
1002 | struct ib_send_wr *first, bool flush) | |
1003 | { | |
1004 | struct ib_send_wr wr, *bad_wr; | |
1005 | int ret; | |
1006 | ||
1007 | sge->addr = qe->dma; | |
1008 | sge->length = sizeof(struct nvme_command), | |
1009 | sge->lkey = queue->device->pd->local_dma_lkey; | |
1010 | ||
1011 | qe->cqe.done = nvme_rdma_send_done; | |
1012 | ||
1013 | wr.next = NULL; | |
1014 | wr.wr_cqe = &qe->cqe; | |
1015 | wr.sg_list = sge; | |
1016 | wr.num_sge = num_sge; | |
1017 | wr.opcode = IB_WR_SEND; | |
1018 | wr.send_flags = 0; | |
1019 | ||
1020 | /* | |
1021 | * Unsignalled send completions are another giant desaster in the | |
1022 | * IB Verbs spec: If we don't regularly post signalled sends | |
1023 | * the send queue will fill up and only a QP reset will rescue us. | |
1024 | * Would have been way to obvious to handle this in hardware or | |
1025 | * at least the RDMA stack.. | |
1026 | * | |
1027 | * This messy and racy code sniplet is copy and pasted from the iSER | |
1028 | * initiator, and the magic '32' comes from there as well. | |
1029 | * | |
1030 | * Always signal the flushes. The magic request used for the flush | |
1031 | * sequencer is not allocated in our driver's tagset and it's | |
1032 | * triggered to be freed by blk_cleanup_queue(). So we need to | |
1033 | * always mark it as signaled to ensure that the "wr_cqe", which is | |
1034 | * embeded in request's payload, is not freed when __ib_process_cq() | |
1035 | * calls wr_cqe->done(). | |
1036 | */ | |
1037 | if ((++queue->sig_count % 32) == 0 || flush) | |
1038 | wr.send_flags |= IB_SEND_SIGNALED; | |
1039 | ||
1040 | if (first) | |
1041 | first->next = ≀ | |
1042 | else | |
1043 | first = ≀ | |
1044 | ||
1045 | ret = ib_post_send(queue->qp, first, &bad_wr); | |
1046 | if (ret) { | |
1047 | dev_err(queue->ctrl->ctrl.device, | |
1048 | "%s failed with error code %d\n", __func__, ret); | |
1049 | } | |
1050 | return ret; | |
1051 | } | |
1052 | ||
1053 | static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue, | |
1054 | struct nvme_rdma_qe *qe) | |
1055 | { | |
1056 | struct ib_recv_wr wr, *bad_wr; | |
1057 | struct ib_sge list; | |
1058 | int ret; | |
1059 | ||
1060 | list.addr = qe->dma; | |
1061 | list.length = sizeof(struct nvme_completion); | |
1062 | list.lkey = queue->device->pd->local_dma_lkey; | |
1063 | ||
1064 | qe->cqe.done = nvme_rdma_recv_done; | |
1065 | ||
1066 | wr.next = NULL; | |
1067 | wr.wr_cqe = &qe->cqe; | |
1068 | wr.sg_list = &list; | |
1069 | wr.num_sge = 1; | |
1070 | ||
1071 | ret = ib_post_recv(queue->qp, &wr, &bad_wr); | |
1072 | if (ret) { | |
1073 | dev_err(queue->ctrl->ctrl.device, | |
1074 | "%s failed with error code %d\n", __func__, ret); | |
1075 | } | |
1076 | return ret; | |
1077 | } | |
1078 | ||
1079 | static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue) | |
1080 | { | |
1081 | u32 queue_idx = nvme_rdma_queue_idx(queue); | |
1082 | ||
1083 | if (queue_idx == 0) | |
1084 | return queue->ctrl->admin_tag_set.tags[queue_idx]; | |
1085 | return queue->ctrl->tag_set.tags[queue_idx - 1]; | |
1086 | } | |
1087 | ||
1088 | static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg, int aer_idx) | |
1089 | { | |
1090 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg); | |
1091 | struct nvme_rdma_queue *queue = &ctrl->queues[0]; | |
1092 | struct ib_device *dev = queue->device->dev; | |
1093 | struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe; | |
1094 | struct nvme_command *cmd = sqe->data; | |
1095 | struct ib_sge sge; | |
1096 | int ret; | |
1097 | ||
1098 | if (WARN_ON_ONCE(aer_idx != 0)) | |
1099 | return; | |
1100 | ||
1101 | ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE); | |
1102 | ||
1103 | memset(cmd, 0, sizeof(*cmd)); | |
1104 | cmd->common.opcode = nvme_admin_async_event; | |
1105 | cmd->common.command_id = NVME_RDMA_AQ_BLKMQ_DEPTH; | |
1106 | cmd->common.flags |= NVME_CMD_SGL_METABUF; | |
1107 | nvme_rdma_set_sg_null(cmd); | |
1108 | ||
1109 | ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd), | |
1110 | DMA_TO_DEVICE); | |
1111 | ||
1112 | ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL, false); | |
1113 | WARN_ON_ONCE(ret); | |
1114 | } | |
1115 | ||
1116 | static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue, | |
1117 | struct nvme_completion *cqe, struct ib_wc *wc, int tag) | |
1118 | { | |
1119 | u16 status = le16_to_cpu(cqe->status); | |
1120 | struct request *rq; | |
1121 | struct nvme_rdma_request *req; | |
1122 | int ret = 0; | |
1123 | ||
1124 | status >>= 1; | |
1125 | ||
1126 | rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id); | |
1127 | if (!rq) { | |
1128 | dev_err(queue->ctrl->ctrl.device, | |
1129 | "tag 0x%x on QP %#x not found\n", | |
1130 | cqe->command_id, queue->qp->qp_num); | |
1131 | nvme_rdma_error_recovery(queue->ctrl); | |
1132 | return ret; | |
1133 | } | |
1134 | req = blk_mq_rq_to_pdu(rq); | |
1135 | ||
1136 | if (rq->cmd_type == REQ_TYPE_DRV_PRIV && rq->special) | |
1137 | memcpy(rq->special, cqe, sizeof(*cqe)); | |
1138 | ||
1139 | if (rq->tag == tag) | |
1140 | ret = 1; | |
1141 | ||
1142 | if ((wc->wc_flags & IB_WC_WITH_INVALIDATE) && | |
1143 | wc->ex.invalidate_rkey == req->mr->rkey) | |
f5b7b559 | 1144 | req->mr->need_inval = false; |
71102307 CH |
1145 | |
1146 | blk_mq_complete_request(rq, status); | |
1147 | ||
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag) | |
1152 | { | |
1153 | struct nvme_rdma_qe *qe = | |
1154 | container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe); | |
1155 | struct nvme_rdma_queue *queue = cq->cq_context; | |
1156 | struct ib_device *ibdev = queue->device->dev; | |
1157 | struct nvme_completion *cqe = qe->data; | |
1158 | const size_t len = sizeof(struct nvme_completion); | |
1159 | int ret = 0; | |
1160 | ||
1161 | if (unlikely(wc->status != IB_WC_SUCCESS)) { | |
1162 | nvme_rdma_wr_error(cq, wc, "RECV"); | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE); | |
1167 | /* | |
1168 | * AEN requests are special as they don't time out and can | |
1169 | * survive any kind of queue freeze and often don't respond to | |
1170 | * aborts. We don't even bother to allocate a struct request | |
1171 | * for them but rather special case them here. | |
1172 | */ | |
1173 | if (unlikely(nvme_rdma_queue_idx(queue) == 0 && | |
1174 | cqe->command_id >= NVME_RDMA_AQ_BLKMQ_DEPTH)) | |
1175 | nvme_complete_async_event(&queue->ctrl->ctrl, cqe); | |
1176 | else | |
1177 | ret = nvme_rdma_process_nvme_rsp(queue, cqe, wc, tag); | |
1178 | ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE); | |
1179 | ||
1180 | nvme_rdma_post_recv(queue, qe); | |
1181 | return ret; | |
1182 | } | |
1183 | ||
1184 | static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) | |
1185 | { | |
1186 | __nvme_rdma_recv_done(cq, wc, -1); | |
1187 | } | |
1188 | ||
1189 | static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue) | |
1190 | { | |
1191 | int ret, i; | |
1192 | ||
1193 | for (i = 0; i < queue->queue_size; i++) { | |
1194 | ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]); | |
1195 | if (ret) | |
1196 | goto out_destroy_queue_ib; | |
1197 | } | |
1198 | ||
1199 | return 0; | |
1200 | ||
1201 | out_destroy_queue_ib: | |
1202 | nvme_rdma_destroy_queue_ib(queue); | |
1203 | return ret; | |
1204 | } | |
1205 | ||
1206 | static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue, | |
1207 | struct rdma_cm_event *ev) | |
1208 | { | |
1209 | if (ev->param.conn.private_data_len) { | |
1210 | struct nvme_rdma_cm_rej *rej = | |
1211 | (struct nvme_rdma_cm_rej *)ev->param.conn.private_data; | |
1212 | ||
1213 | dev_err(queue->ctrl->ctrl.device, | |
1214 | "Connect rejected, status %d.", le16_to_cpu(rej->sts)); | |
1215 | /* XXX: Think of something clever to do here... */ | |
1216 | } else { | |
1217 | dev_err(queue->ctrl->ctrl.device, | |
1218 | "Connect rejected, no private data.\n"); | |
1219 | } | |
1220 | ||
1221 | return -ECONNRESET; | |
1222 | } | |
1223 | ||
1224 | static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue) | |
1225 | { | |
1226 | struct nvme_rdma_device *dev; | |
1227 | int ret; | |
1228 | ||
1229 | dev = nvme_rdma_find_get_device(queue->cm_id); | |
1230 | if (!dev) { | |
1231 | dev_err(queue->cm_id->device->dma_device, | |
1232 | "no client data found!\n"); | |
1233 | return -ECONNREFUSED; | |
1234 | } | |
1235 | ||
1236 | ret = nvme_rdma_create_queue_ib(queue, dev); | |
1237 | if (ret) { | |
1238 | nvme_rdma_dev_put(dev); | |
1239 | goto out; | |
1240 | } | |
1241 | ||
1242 | ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS); | |
1243 | if (ret) { | |
1244 | dev_err(queue->ctrl->ctrl.device, | |
1245 | "rdma_resolve_route failed (%d).\n", | |
1246 | queue->cm_error); | |
1247 | goto out_destroy_queue; | |
1248 | } | |
1249 | ||
1250 | return 0; | |
1251 | ||
1252 | out_destroy_queue: | |
1253 | nvme_rdma_destroy_queue_ib(queue); | |
1254 | out: | |
1255 | return ret; | |
1256 | } | |
1257 | ||
1258 | static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue) | |
1259 | { | |
1260 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
1261 | struct rdma_conn_param param = { }; | |
0b857b44 | 1262 | struct nvme_rdma_cm_req priv = { }; |
71102307 CH |
1263 | int ret; |
1264 | ||
1265 | param.qp_num = queue->qp->qp_num; | |
1266 | param.flow_control = 1; | |
1267 | ||
1268 | param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom; | |
2ac17c28 SG |
1269 | /* maximum retry count */ |
1270 | param.retry_count = 7; | |
71102307 CH |
1271 | param.rnr_retry_count = 7; |
1272 | param.private_data = &priv; | |
1273 | param.private_data_len = sizeof(priv); | |
1274 | ||
1275 | priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); | |
1276 | priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue)); | |
f994d9dc JF |
1277 | /* |
1278 | * set the admin queue depth to the minimum size | |
1279 | * specified by the Fabrics standard. | |
1280 | */ | |
1281 | if (priv.qid == 0) { | |
1282 | priv.hrqsize = cpu_to_le16(NVMF_AQ_DEPTH); | |
1283 | priv.hsqsize = cpu_to_le16(NVMF_AQ_DEPTH - 1); | |
1284 | } else { | |
c5af8654 JF |
1285 | /* |
1286 | * current interpretation of the fabrics spec | |
1287 | * is at minimum you make hrqsize sqsize+1, or a | |
1288 | * 1's based representation of sqsize. | |
1289 | */ | |
f994d9dc | 1290 | priv.hrqsize = cpu_to_le16(queue->queue_size); |
c5af8654 | 1291 | priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize); |
f994d9dc | 1292 | } |
71102307 CH |
1293 | |
1294 | ret = rdma_connect(queue->cm_id, ¶m); | |
1295 | if (ret) { | |
1296 | dev_err(ctrl->ctrl.device, | |
1297 | "rdma_connect failed (%d).\n", ret); | |
1298 | goto out_destroy_queue_ib; | |
1299 | } | |
1300 | ||
1301 | return 0; | |
1302 | ||
1303 | out_destroy_queue_ib: | |
1304 | nvme_rdma_destroy_queue_ib(queue); | |
1305 | return ret; | |
1306 | } | |
1307 | ||
1308 | /** | |
1309 | * nvme_rdma_device_unplug() - Handle RDMA device unplug | |
1310 | * @queue: Queue that owns the cm_id that caught the event | |
1311 | * | |
1312 | * DEVICE_REMOVAL event notifies us that the RDMA device is about | |
1313 | * to unplug so we should take care of destroying our RDMA resources. | |
1314 | * This event will be generated for each allocated cm_id. | |
1315 | * | |
1316 | * In our case, the RDMA resources are managed per controller and not | |
1317 | * only per queue. So the way we handle this is we trigger an implicit | |
1318 | * controller deletion upon the first DEVICE_REMOVAL event we see, and | |
1319 | * hold the event inflight until the controller deletion is completed. | |
1320 | * | |
1321 | * One exception that we need to handle is the destruction of the cm_id | |
1322 | * that caught the event. Since we hold the callout until the controller | |
1323 | * deletion is completed, we'll deadlock if the controller deletion will | |
1324 | * call rdma_destroy_id on this queue's cm_id. Thus, we claim ownership | |
57de5a0a SG |
1325 | * of destroying this queue before-hand, destroy the queue resources, |
1326 | * then queue the controller deletion which won't destroy this queue and | |
1327 | * we destroy the cm_id implicitely by returning a non-zero rc to the callout. | |
71102307 CH |
1328 | */ |
1329 | static int nvme_rdma_device_unplug(struct nvme_rdma_queue *queue) | |
1330 | { | |
1331 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
39bbee4e | 1332 | int ret = 0; |
71102307 | 1333 | |
57de5a0a SG |
1334 | /* Own the controller deletion */ |
1335 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) | |
1336 | return 0; | |
71102307 | 1337 | |
57de5a0a SG |
1338 | dev_warn(ctrl->ctrl.device, |
1339 | "Got rdma device removal event, deleting ctrl\n"); | |
71102307 | 1340 | |
57de5a0a SG |
1341 | /* Get rid of reconnect work if its running */ |
1342 | cancel_delayed_work_sync(&ctrl->reconnect_work); | |
71102307 | 1343 | |
57de5a0a SG |
1344 | /* Disable the queue so ctrl delete won't free it */ |
1345 | if (test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags)) { | |
71102307 | 1346 | /* Free this queue ourselves */ |
57de5a0a | 1347 | nvme_rdma_stop_queue(queue); |
71102307 | 1348 | nvme_rdma_destroy_queue_ib(queue); |
57de5a0a SG |
1349 | |
1350 | /* Return non-zero so the cm_id will destroy implicitly */ | |
1351 | ret = 1; | |
71102307 CH |
1352 | } |
1353 | ||
57de5a0a SG |
1354 | /* Queue controller deletion */ |
1355 | queue_work(nvme_rdma_wq, &ctrl->delete_work); | |
1356 | flush_work(&ctrl->delete_work); | |
1357 | return ret; | |
71102307 CH |
1358 | } |
1359 | ||
1360 | static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, | |
1361 | struct rdma_cm_event *ev) | |
1362 | { | |
1363 | struct nvme_rdma_queue *queue = cm_id->context; | |
1364 | int cm_error = 0; | |
1365 | ||
1366 | dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n", | |
1367 | rdma_event_msg(ev->event), ev->event, | |
1368 | ev->status, cm_id); | |
1369 | ||
1370 | switch (ev->event) { | |
1371 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
1372 | cm_error = nvme_rdma_addr_resolved(queue); | |
1373 | break; | |
1374 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
1375 | cm_error = nvme_rdma_route_resolved(queue); | |
1376 | break; | |
1377 | case RDMA_CM_EVENT_ESTABLISHED: | |
1378 | queue->cm_error = nvme_rdma_conn_established(queue); | |
1379 | /* complete cm_done regardless of success/failure */ | |
1380 | complete(&queue->cm_done); | |
1381 | return 0; | |
1382 | case RDMA_CM_EVENT_REJECTED: | |
1383 | cm_error = nvme_rdma_conn_rejected(queue, ev); | |
1384 | break; | |
1385 | case RDMA_CM_EVENT_ADDR_ERROR: | |
1386 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
1387 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
1388 | case RDMA_CM_EVENT_UNREACHABLE: | |
1389 | dev_dbg(queue->ctrl->ctrl.device, | |
1390 | "CM error event %d\n", ev->event); | |
1391 | cm_error = -ECONNRESET; | |
1392 | break; | |
1393 | case RDMA_CM_EVENT_DISCONNECTED: | |
1394 | case RDMA_CM_EVENT_ADDR_CHANGE: | |
1395 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: | |
1396 | dev_dbg(queue->ctrl->ctrl.device, | |
1397 | "disconnect received - connection closed\n"); | |
1398 | nvme_rdma_error_recovery(queue->ctrl); | |
1399 | break; | |
1400 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
1401 | /* return 1 means impliciy CM ID destroy */ | |
1402 | return nvme_rdma_device_unplug(queue); | |
1403 | default: | |
1404 | dev_err(queue->ctrl->ctrl.device, | |
1405 | "Unexpected RDMA CM event (%d)\n", ev->event); | |
1406 | nvme_rdma_error_recovery(queue->ctrl); | |
1407 | break; | |
1408 | } | |
1409 | ||
1410 | if (cm_error) { | |
1411 | queue->cm_error = cm_error; | |
1412 | complete(&queue->cm_done); | |
1413 | } | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | static enum blk_eh_timer_return | |
1419 | nvme_rdma_timeout(struct request *rq, bool reserved) | |
1420 | { | |
1421 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
1422 | ||
1423 | /* queue error recovery */ | |
1424 | nvme_rdma_error_recovery(req->queue->ctrl); | |
1425 | ||
1426 | /* fail with DNR on cmd timeout */ | |
1427 | rq->errors = NVME_SC_ABORT_REQ | NVME_SC_DNR; | |
1428 | ||
1429 | return BLK_EH_HANDLED; | |
1430 | } | |
1431 | ||
1432 | static int nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx, | |
1433 | const struct blk_mq_queue_data *bd) | |
1434 | { | |
1435 | struct nvme_ns *ns = hctx->queue->queuedata; | |
1436 | struct nvme_rdma_queue *queue = hctx->driver_data; | |
1437 | struct request *rq = bd->rq; | |
1438 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
1439 | struct nvme_rdma_qe *sqe = &req->sqe; | |
1440 | struct nvme_command *c = sqe->data; | |
1441 | bool flush = false; | |
1442 | struct ib_device *dev; | |
1443 | unsigned int map_len; | |
1444 | int ret; | |
1445 | ||
1446 | WARN_ON_ONCE(rq->tag < 0); | |
1447 | ||
1448 | dev = queue->device->dev; | |
1449 | ib_dma_sync_single_for_cpu(dev, sqe->dma, | |
1450 | sizeof(struct nvme_command), DMA_TO_DEVICE); | |
1451 | ||
1452 | ret = nvme_setup_cmd(ns, rq, c); | |
1453 | if (ret) | |
1454 | return ret; | |
1455 | ||
1456 | c->common.command_id = rq->tag; | |
1457 | blk_mq_start_request(rq); | |
1458 | ||
1459 | map_len = nvme_map_len(rq); | |
1460 | ret = nvme_rdma_map_data(queue, rq, map_len, c); | |
1461 | if (ret < 0) { | |
1462 | dev_err(queue->ctrl->ctrl.device, | |
1463 | "Failed to map data (%d)\n", ret); | |
1464 | nvme_cleanup_cmd(rq); | |
1465 | goto err; | |
1466 | } | |
1467 | ||
1468 | ib_dma_sync_single_for_device(dev, sqe->dma, | |
1469 | sizeof(struct nvme_command), DMA_TO_DEVICE); | |
1470 | ||
1471 | if (rq->cmd_type == REQ_TYPE_FS && req_op(rq) == REQ_OP_FLUSH) | |
1472 | flush = true; | |
1473 | ret = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge, | |
f5b7b559 | 1474 | req->mr->need_inval ? &req->reg_wr.wr : NULL, flush); |
71102307 CH |
1475 | if (ret) { |
1476 | nvme_rdma_unmap_data(queue, rq); | |
1477 | goto err; | |
1478 | } | |
1479 | ||
1480 | return BLK_MQ_RQ_QUEUE_OK; | |
1481 | err: | |
1482 | return (ret == -ENOMEM || ret == -EAGAIN) ? | |
1483 | BLK_MQ_RQ_QUEUE_BUSY : BLK_MQ_RQ_QUEUE_ERROR; | |
1484 | } | |
1485 | ||
1486 | static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) | |
1487 | { | |
1488 | struct nvme_rdma_queue *queue = hctx->driver_data; | |
1489 | struct ib_cq *cq = queue->ib_cq; | |
1490 | struct ib_wc wc; | |
1491 | int found = 0; | |
1492 | ||
1493 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
1494 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
1495 | struct ib_cqe *cqe = wc.wr_cqe; | |
1496 | ||
1497 | if (cqe) { | |
1498 | if (cqe->done == nvme_rdma_recv_done) | |
1499 | found |= __nvme_rdma_recv_done(cq, &wc, tag); | |
1500 | else | |
1501 | cqe->done(cq, &wc); | |
1502 | } | |
1503 | } | |
1504 | ||
1505 | return found; | |
1506 | } | |
1507 | ||
1508 | static void nvme_rdma_complete_rq(struct request *rq) | |
1509 | { | |
1510 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
1511 | struct nvme_rdma_queue *queue = req->queue; | |
1512 | int error = 0; | |
1513 | ||
1514 | nvme_rdma_unmap_data(queue, rq); | |
1515 | ||
1516 | if (unlikely(rq->errors)) { | |
1517 | if (nvme_req_needs_retry(rq, rq->errors)) { | |
1518 | nvme_requeue_req(rq); | |
1519 | return; | |
1520 | } | |
1521 | ||
1522 | if (rq->cmd_type == REQ_TYPE_DRV_PRIV) | |
1523 | error = rq->errors; | |
1524 | else | |
1525 | error = nvme_error_status(rq->errors); | |
1526 | } | |
1527 | ||
1528 | blk_mq_end_request(rq, error); | |
1529 | } | |
1530 | ||
1531 | static struct blk_mq_ops nvme_rdma_mq_ops = { | |
1532 | .queue_rq = nvme_rdma_queue_rq, | |
1533 | .complete = nvme_rdma_complete_rq, | |
1534 | .map_queue = blk_mq_map_queue, | |
1535 | .init_request = nvme_rdma_init_request, | |
1536 | .exit_request = nvme_rdma_exit_request, | |
1537 | .reinit_request = nvme_rdma_reinit_request, | |
1538 | .init_hctx = nvme_rdma_init_hctx, | |
1539 | .poll = nvme_rdma_poll, | |
1540 | .timeout = nvme_rdma_timeout, | |
1541 | }; | |
1542 | ||
1543 | static struct blk_mq_ops nvme_rdma_admin_mq_ops = { | |
1544 | .queue_rq = nvme_rdma_queue_rq, | |
1545 | .complete = nvme_rdma_complete_rq, | |
1546 | .map_queue = blk_mq_map_queue, | |
1547 | .init_request = nvme_rdma_init_admin_request, | |
1548 | .exit_request = nvme_rdma_exit_admin_request, | |
1549 | .reinit_request = nvme_rdma_reinit_request, | |
1550 | .init_hctx = nvme_rdma_init_admin_hctx, | |
1551 | .timeout = nvme_rdma_timeout, | |
1552 | }; | |
1553 | ||
1554 | static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl) | |
1555 | { | |
1556 | int error; | |
1557 | ||
1558 | error = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH); | |
1559 | if (error) | |
1560 | return error; | |
1561 | ||
1562 | ctrl->device = ctrl->queues[0].device; | |
1563 | ||
1564 | /* | |
1565 | * We need a reference on the device as long as the tag_set is alive, | |
1566 | * as the MRs in the request structures need a valid ib_device. | |
1567 | */ | |
1568 | error = -EINVAL; | |
1569 | if (!nvme_rdma_dev_get(ctrl->device)) | |
1570 | goto out_free_queue; | |
1571 | ||
1572 | ctrl->max_fr_pages = min_t(u32, NVME_RDMA_MAX_SEGMENTS, | |
1573 | ctrl->device->dev->attrs.max_fast_reg_page_list_len); | |
1574 | ||
1575 | memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); | |
1576 | ctrl->admin_tag_set.ops = &nvme_rdma_admin_mq_ops; | |
1577 | ctrl->admin_tag_set.queue_depth = NVME_RDMA_AQ_BLKMQ_DEPTH; | |
1578 | ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ | |
1579 | ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; | |
1580 | ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_rdma_request) + | |
1581 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
1582 | ctrl->admin_tag_set.driver_data = ctrl; | |
1583 | ctrl->admin_tag_set.nr_hw_queues = 1; | |
1584 | ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; | |
1585 | ||
1586 | error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); | |
1587 | if (error) | |
1588 | goto out_put_dev; | |
1589 | ||
1590 | ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); | |
1591 | if (IS_ERR(ctrl->ctrl.admin_q)) { | |
1592 | error = PTR_ERR(ctrl->ctrl.admin_q); | |
1593 | goto out_free_tagset; | |
1594 | } | |
1595 | ||
1596 | error = nvmf_connect_admin_queue(&ctrl->ctrl); | |
1597 | if (error) | |
1598 | goto out_cleanup_queue; | |
1599 | ||
1600 | error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap); | |
1601 | if (error) { | |
1602 | dev_err(ctrl->ctrl.device, | |
1603 | "prop_get NVME_REG_CAP failed\n"); | |
1604 | goto out_cleanup_queue; | |
1605 | } | |
1606 | ||
1607 | ctrl->ctrl.sqsize = | |
1608 | min_t(int, NVME_CAP_MQES(ctrl->cap) + 1, ctrl->ctrl.sqsize); | |
1609 | ||
1610 | error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap); | |
1611 | if (error) | |
1612 | goto out_cleanup_queue; | |
1613 | ||
1614 | ctrl->ctrl.max_hw_sectors = | |
1615 | (ctrl->max_fr_pages - 1) << (PAGE_SHIFT - 9); | |
1616 | ||
1617 | error = nvme_init_identify(&ctrl->ctrl); | |
1618 | if (error) | |
1619 | goto out_cleanup_queue; | |
1620 | ||
1621 | error = nvme_rdma_alloc_qe(ctrl->queues[0].device->dev, | |
1622 | &ctrl->async_event_sqe, sizeof(struct nvme_command), | |
1623 | DMA_TO_DEVICE); | |
1624 | if (error) | |
1625 | goto out_cleanup_queue; | |
1626 | ||
1627 | nvme_start_keep_alive(&ctrl->ctrl); | |
1628 | ||
1629 | return 0; | |
1630 | ||
1631 | out_cleanup_queue: | |
1632 | blk_cleanup_queue(ctrl->ctrl.admin_q); | |
1633 | out_free_tagset: | |
1634 | /* disconnect and drain the queue before freeing the tagset */ | |
1635 | nvme_rdma_stop_queue(&ctrl->queues[0]); | |
1636 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
1637 | out_put_dev: | |
1638 | nvme_rdma_dev_put(ctrl->device); | |
1639 | out_free_queue: | |
1640 | nvme_rdma_free_queue(&ctrl->queues[0]); | |
1641 | return error; | |
1642 | } | |
1643 | ||
1644 | static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl) | |
1645 | { | |
1646 | nvme_stop_keep_alive(&ctrl->ctrl); | |
1647 | cancel_work_sync(&ctrl->err_work); | |
1648 | cancel_delayed_work_sync(&ctrl->reconnect_work); | |
1649 | ||
1650 | if (ctrl->queue_count > 1) { | |
1651 | nvme_stop_queues(&ctrl->ctrl); | |
1652 | blk_mq_tagset_busy_iter(&ctrl->tag_set, | |
1653 | nvme_cancel_request, &ctrl->ctrl); | |
1654 | nvme_rdma_free_io_queues(ctrl); | |
1655 | } | |
1656 | ||
45862ebc | 1657 | if (test_bit(NVME_RDMA_Q_CONNECTED, &ctrl->queues[0].flags)) |
71102307 CH |
1658 | nvme_shutdown_ctrl(&ctrl->ctrl); |
1659 | ||
1660 | blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); | |
1661 | blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, | |
1662 | nvme_cancel_request, &ctrl->ctrl); | |
1663 | nvme_rdma_destroy_admin_queue(ctrl); | |
1664 | } | |
1665 | ||
2461a8dd SG |
1666 | static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown) |
1667 | { | |
1668 | nvme_uninit_ctrl(&ctrl->ctrl); | |
1669 | if (shutdown) | |
1670 | nvme_rdma_shutdown_ctrl(ctrl); | |
a34ca17a SG |
1671 | |
1672 | if (ctrl->ctrl.tagset) { | |
1673 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
1674 | blk_mq_free_tag_set(&ctrl->tag_set); | |
1675 | nvme_rdma_dev_put(ctrl->device); | |
1676 | } | |
1677 | ||
2461a8dd SG |
1678 | nvme_put_ctrl(&ctrl->ctrl); |
1679 | } | |
1680 | ||
71102307 CH |
1681 | static void nvme_rdma_del_ctrl_work(struct work_struct *work) |
1682 | { | |
1683 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
1684 | struct nvme_rdma_ctrl, delete_work); | |
1685 | ||
2461a8dd | 1686 | __nvme_rdma_remove_ctrl(ctrl, true); |
71102307 CH |
1687 | } |
1688 | ||
1689 | static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl) | |
1690 | { | |
1691 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) | |
1692 | return -EBUSY; | |
1693 | ||
1694 | if (!queue_work(nvme_rdma_wq, &ctrl->delete_work)) | |
1695 | return -EBUSY; | |
1696 | ||
1697 | return 0; | |
1698 | } | |
1699 | ||
1700 | static int nvme_rdma_del_ctrl(struct nvme_ctrl *nctrl) | |
1701 | { | |
1702 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); | |
1703 | int ret; | |
1704 | ||
1705 | ret = __nvme_rdma_del_ctrl(ctrl); | |
1706 | if (ret) | |
1707 | return ret; | |
1708 | ||
1709 | flush_work(&ctrl->delete_work); | |
1710 | ||
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | static void nvme_rdma_remove_ctrl_work(struct work_struct *work) | |
1715 | { | |
1716 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
1717 | struct nvme_rdma_ctrl, delete_work); | |
1718 | ||
2461a8dd | 1719 | __nvme_rdma_remove_ctrl(ctrl, false); |
71102307 CH |
1720 | } |
1721 | ||
1722 | static void nvme_rdma_reset_ctrl_work(struct work_struct *work) | |
1723 | { | |
1724 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
1725 | struct nvme_rdma_ctrl, reset_work); | |
1726 | int ret; | |
1727 | bool changed; | |
1728 | ||
1729 | nvme_rdma_shutdown_ctrl(ctrl); | |
1730 | ||
1731 | ret = nvme_rdma_configure_admin_queue(ctrl); | |
1732 | if (ret) { | |
1733 | /* ctrl is already shutdown, just remove the ctrl */ | |
1734 | INIT_WORK(&ctrl->delete_work, nvme_rdma_remove_ctrl_work); | |
1735 | goto del_dead_ctrl; | |
1736 | } | |
1737 | ||
1738 | if (ctrl->queue_count > 1) { | |
1739 | ret = blk_mq_reinit_tagset(&ctrl->tag_set); | |
1740 | if (ret) | |
1741 | goto del_dead_ctrl; | |
1742 | ||
1743 | ret = nvme_rdma_init_io_queues(ctrl); | |
1744 | if (ret) | |
1745 | goto del_dead_ctrl; | |
1746 | ||
1747 | ret = nvme_rdma_connect_io_queues(ctrl); | |
1748 | if (ret) | |
1749 | goto del_dead_ctrl; | |
1750 | } | |
1751 | ||
1752 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
1753 | WARN_ON_ONCE(!changed); | |
1754 | ||
1755 | if (ctrl->queue_count > 1) { | |
1756 | nvme_start_queues(&ctrl->ctrl); | |
1757 | nvme_queue_scan(&ctrl->ctrl); | |
3ef1b4b2 | 1758 | nvme_queue_async_events(&ctrl->ctrl); |
71102307 CH |
1759 | } |
1760 | ||
1761 | return; | |
1762 | ||
1763 | del_dead_ctrl: | |
1764 | /* Deleting this dead controller... */ | |
1765 | dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); | |
1766 | WARN_ON(!queue_work(nvme_rdma_wq, &ctrl->delete_work)); | |
1767 | } | |
1768 | ||
1769 | static int nvme_rdma_reset_ctrl(struct nvme_ctrl *nctrl) | |
1770 | { | |
1771 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); | |
1772 | ||
1773 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING)) | |
1774 | return -EBUSY; | |
1775 | ||
1776 | if (!queue_work(nvme_rdma_wq, &ctrl->reset_work)) | |
1777 | return -EBUSY; | |
1778 | ||
1779 | flush_work(&ctrl->reset_work); | |
1780 | ||
1781 | return 0; | |
1782 | } | |
1783 | ||
1784 | static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = { | |
1785 | .name = "rdma", | |
1786 | .module = THIS_MODULE, | |
1787 | .is_fabrics = true, | |
1788 | .reg_read32 = nvmf_reg_read32, | |
1789 | .reg_read64 = nvmf_reg_read64, | |
1790 | .reg_write32 = nvmf_reg_write32, | |
1791 | .reset_ctrl = nvme_rdma_reset_ctrl, | |
1792 | .free_ctrl = nvme_rdma_free_ctrl, | |
1793 | .submit_async_event = nvme_rdma_submit_async_event, | |
1794 | .delete_ctrl = nvme_rdma_del_ctrl, | |
1795 | .get_subsysnqn = nvmf_get_subsysnqn, | |
1796 | .get_address = nvmf_get_address, | |
1797 | }; | |
1798 | ||
1799 | static int nvme_rdma_create_io_queues(struct nvme_rdma_ctrl *ctrl) | |
1800 | { | |
1801 | struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; | |
1802 | int ret; | |
1803 | ||
1804 | ret = nvme_set_queue_count(&ctrl->ctrl, &opts->nr_io_queues); | |
1805 | if (ret) | |
1806 | return ret; | |
1807 | ||
1808 | ctrl->queue_count = opts->nr_io_queues + 1; | |
1809 | if (ctrl->queue_count < 2) | |
1810 | return 0; | |
1811 | ||
1812 | dev_info(ctrl->ctrl.device, | |
1813 | "creating %d I/O queues.\n", opts->nr_io_queues); | |
1814 | ||
1815 | ret = nvme_rdma_init_io_queues(ctrl); | |
1816 | if (ret) | |
1817 | return ret; | |
1818 | ||
1819 | /* | |
1820 | * We need a reference on the device as long as the tag_set is alive, | |
1821 | * as the MRs in the request structures need a valid ib_device. | |
1822 | */ | |
1823 | ret = -EINVAL; | |
1824 | if (!nvme_rdma_dev_get(ctrl->device)) | |
1825 | goto out_free_io_queues; | |
1826 | ||
1827 | memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); | |
1828 | ctrl->tag_set.ops = &nvme_rdma_mq_ops; | |
c5af8654 | 1829 | ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size; |
71102307 CH |
1830 | ctrl->tag_set.reserved_tags = 1; /* fabric connect */ |
1831 | ctrl->tag_set.numa_node = NUMA_NO_NODE; | |
1832 | ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
1833 | ctrl->tag_set.cmd_size = sizeof(struct nvme_rdma_request) + | |
1834 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
1835 | ctrl->tag_set.driver_data = ctrl; | |
1836 | ctrl->tag_set.nr_hw_queues = ctrl->queue_count - 1; | |
1837 | ctrl->tag_set.timeout = NVME_IO_TIMEOUT; | |
1838 | ||
1839 | ret = blk_mq_alloc_tag_set(&ctrl->tag_set); | |
1840 | if (ret) | |
1841 | goto out_put_dev; | |
1842 | ctrl->ctrl.tagset = &ctrl->tag_set; | |
1843 | ||
1844 | ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); | |
1845 | if (IS_ERR(ctrl->ctrl.connect_q)) { | |
1846 | ret = PTR_ERR(ctrl->ctrl.connect_q); | |
1847 | goto out_free_tag_set; | |
1848 | } | |
1849 | ||
1850 | ret = nvme_rdma_connect_io_queues(ctrl); | |
1851 | if (ret) | |
1852 | goto out_cleanup_connect_q; | |
1853 | ||
1854 | return 0; | |
1855 | ||
1856 | out_cleanup_connect_q: | |
1857 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
1858 | out_free_tag_set: | |
1859 | blk_mq_free_tag_set(&ctrl->tag_set); | |
1860 | out_put_dev: | |
1861 | nvme_rdma_dev_put(ctrl->device); | |
1862 | out_free_io_queues: | |
1863 | nvme_rdma_free_io_queues(ctrl); | |
1864 | return ret; | |
1865 | } | |
1866 | ||
1867 | static int nvme_rdma_parse_ipaddr(struct sockaddr_in *in_addr, char *p) | |
1868 | { | |
1869 | u8 *addr = (u8 *)&in_addr->sin_addr.s_addr; | |
1870 | size_t buflen = strlen(p); | |
1871 | ||
1872 | /* XXX: handle IPv6 addresses */ | |
1873 | ||
1874 | if (buflen > INET_ADDRSTRLEN) | |
1875 | return -EINVAL; | |
1876 | if (in4_pton(p, buflen, addr, '\0', NULL) == 0) | |
1877 | return -EINVAL; | |
1878 | in_addr->sin_family = AF_INET; | |
1879 | return 0; | |
1880 | } | |
1881 | ||
1882 | static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev, | |
1883 | struct nvmf_ctrl_options *opts) | |
1884 | { | |
1885 | struct nvme_rdma_ctrl *ctrl; | |
1886 | int ret; | |
1887 | bool changed; | |
1888 | ||
1889 | ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); | |
1890 | if (!ctrl) | |
1891 | return ERR_PTR(-ENOMEM); | |
1892 | ctrl->ctrl.opts = opts; | |
1893 | INIT_LIST_HEAD(&ctrl->list); | |
1894 | ||
1895 | ret = nvme_rdma_parse_ipaddr(&ctrl->addr_in, opts->traddr); | |
1896 | if (ret) { | |
1897 | pr_err("malformed IP address passed: %s\n", opts->traddr); | |
1898 | goto out_free_ctrl; | |
1899 | } | |
1900 | ||
1901 | if (opts->mask & NVMF_OPT_TRSVCID) { | |
1902 | u16 port; | |
1903 | ||
1904 | ret = kstrtou16(opts->trsvcid, 0, &port); | |
1905 | if (ret) | |
1906 | goto out_free_ctrl; | |
1907 | ||
1908 | ctrl->addr_in.sin_port = cpu_to_be16(port); | |
1909 | } else { | |
1910 | ctrl->addr_in.sin_port = cpu_to_be16(NVME_RDMA_IP_PORT); | |
1911 | } | |
1912 | ||
1913 | ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops, | |
1914 | 0 /* no quirks, we're perfect! */); | |
1915 | if (ret) | |
1916 | goto out_free_ctrl; | |
1917 | ||
1918 | ctrl->reconnect_delay = opts->reconnect_delay; | |
1919 | INIT_DELAYED_WORK(&ctrl->reconnect_work, | |
1920 | nvme_rdma_reconnect_ctrl_work); | |
1921 | INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work); | |
1922 | INIT_WORK(&ctrl->delete_work, nvme_rdma_del_ctrl_work); | |
1923 | INIT_WORK(&ctrl->reset_work, nvme_rdma_reset_ctrl_work); | |
1924 | spin_lock_init(&ctrl->lock); | |
1925 | ||
1926 | ctrl->queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */ | |
c5af8654 | 1927 | ctrl->ctrl.sqsize = opts->queue_size - 1; |
71102307 CH |
1928 | ctrl->ctrl.kato = opts->kato; |
1929 | ||
1930 | ret = -ENOMEM; | |
1931 | ctrl->queues = kcalloc(ctrl->queue_count, sizeof(*ctrl->queues), | |
1932 | GFP_KERNEL); | |
1933 | if (!ctrl->queues) | |
1934 | goto out_uninit_ctrl; | |
1935 | ||
1936 | ret = nvme_rdma_configure_admin_queue(ctrl); | |
1937 | if (ret) | |
1938 | goto out_kfree_queues; | |
1939 | ||
1940 | /* sanity check icdoff */ | |
1941 | if (ctrl->ctrl.icdoff) { | |
1942 | dev_err(ctrl->ctrl.device, "icdoff is not supported!\n"); | |
1943 | goto out_remove_admin_queue; | |
1944 | } | |
1945 | ||
1946 | /* sanity check keyed sgls */ | |
1947 | if (!(ctrl->ctrl.sgls & (1 << 20))) { | |
1948 | dev_err(ctrl->ctrl.device, "Mandatory keyed sgls are not support\n"); | |
1949 | goto out_remove_admin_queue; | |
1950 | } | |
1951 | ||
1952 | if (opts->queue_size > ctrl->ctrl.maxcmd) { | |
1953 | /* warn if maxcmd is lower than queue_size */ | |
1954 | dev_warn(ctrl->ctrl.device, | |
1955 | "queue_size %zu > ctrl maxcmd %u, clamping down\n", | |
1956 | opts->queue_size, ctrl->ctrl.maxcmd); | |
1957 | opts->queue_size = ctrl->ctrl.maxcmd; | |
1958 | } | |
1959 | ||
1960 | if (opts->nr_io_queues) { | |
1961 | ret = nvme_rdma_create_io_queues(ctrl); | |
1962 | if (ret) | |
1963 | goto out_remove_admin_queue; | |
1964 | } | |
1965 | ||
1966 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
1967 | WARN_ON_ONCE(!changed); | |
1968 | ||
1969 | dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISp\n", | |
1970 | ctrl->ctrl.opts->subsysnqn, &ctrl->addr); | |
1971 | ||
1972 | kref_get(&ctrl->ctrl.kref); | |
1973 | ||
1974 | mutex_lock(&nvme_rdma_ctrl_mutex); | |
1975 | list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list); | |
1976 | mutex_unlock(&nvme_rdma_ctrl_mutex); | |
1977 | ||
1978 | if (opts->nr_io_queues) { | |
1979 | nvme_queue_scan(&ctrl->ctrl); | |
1980 | nvme_queue_async_events(&ctrl->ctrl); | |
1981 | } | |
1982 | ||
1983 | return &ctrl->ctrl; | |
1984 | ||
1985 | out_remove_admin_queue: | |
1986 | nvme_stop_keep_alive(&ctrl->ctrl); | |
1987 | nvme_rdma_destroy_admin_queue(ctrl); | |
1988 | out_kfree_queues: | |
1989 | kfree(ctrl->queues); | |
1990 | out_uninit_ctrl: | |
1991 | nvme_uninit_ctrl(&ctrl->ctrl); | |
1992 | nvme_put_ctrl(&ctrl->ctrl); | |
1993 | if (ret > 0) | |
1994 | ret = -EIO; | |
1995 | return ERR_PTR(ret); | |
1996 | out_free_ctrl: | |
1997 | kfree(ctrl); | |
1998 | return ERR_PTR(ret); | |
1999 | } | |
2000 | ||
2001 | static struct nvmf_transport_ops nvme_rdma_transport = { | |
2002 | .name = "rdma", | |
2003 | .required_opts = NVMF_OPT_TRADDR, | |
2ac17c28 | 2004 | .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY, |
71102307 CH |
2005 | .create_ctrl = nvme_rdma_create_ctrl, |
2006 | }; | |
2007 | ||
2008 | static int __init nvme_rdma_init_module(void) | |
2009 | { | |
2010 | nvme_rdma_wq = create_workqueue("nvme_rdma_wq"); | |
2011 | if (!nvme_rdma_wq) | |
2012 | return -ENOMEM; | |
2013 | ||
2014 | nvmf_register_transport(&nvme_rdma_transport); | |
2015 | return 0; | |
2016 | } | |
2017 | ||
2018 | static void __exit nvme_rdma_cleanup_module(void) | |
2019 | { | |
2020 | struct nvme_rdma_ctrl *ctrl; | |
2021 | ||
2022 | nvmf_unregister_transport(&nvme_rdma_transport); | |
2023 | ||
2024 | mutex_lock(&nvme_rdma_ctrl_mutex); | |
2025 | list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) | |
2026 | __nvme_rdma_del_ctrl(ctrl); | |
2027 | mutex_unlock(&nvme_rdma_ctrl_mutex); | |
2028 | ||
2029 | destroy_workqueue(nvme_rdma_wq); | |
2030 | } | |
2031 | ||
2032 | module_init(nvme_rdma_init_module); | |
2033 | module_exit(nvme_rdma_cleanup_module); | |
2034 | ||
2035 | MODULE_LICENSE("GPL v2"); |