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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 | |
15 | #include <linux/delay.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/jiffies.h> | |
22 | #include <linux/atomic.h> | |
23 | #include <linux/blk-mq.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/scatterlist.h> | |
28 | #include <linux/nvme.h> | |
29 | #include <linux/t10-pi.h> | |
30 | #include <asm/unaligned.h> | |
31 | ||
32 | #include <rdma/ib_verbs.h> | |
33 | #include <rdma/rdma_cm.h> | |
34 | #include <rdma/ib_cm.h> | |
35 | #include <linux/nvme-rdma.h> | |
36 | ||
37 | #include "nvme.h" | |
38 | #include "fabrics.h" | |
39 | ||
40 | ||
41 | #define NVME_RDMA_CONNECT_TIMEOUT_MS 1000 /* 1 second */ | |
42 | ||
43 | #define NVME_RDMA_MAX_SEGMENT_SIZE 0xffffff /* 24-bit SGL field */ | |
44 | ||
45 | #define NVME_RDMA_MAX_SEGMENTS 256 | |
46 | ||
47 | #define NVME_RDMA_MAX_INLINE_SEGMENTS 1 | |
48 | ||
49 | #define NVME_RDMA_MAX_PAGES_PER_MR 512 | |
50 | ||
51 | #define NVME_RDMA_DEF_RECONNECT_DELAY 20 | |
52 | ||
53 | /* | |
54 | * We handle AEN commands ourselves and don't even let the | |
55 | * block layer know about them. | |
56 | */ | |
57 | #define NVME_RDMA_NR_AEN_COMMANDS 1 | |
58 | #define NVME_RDMA_AQ_BLKMQ_DEPTH \ | |
59 | (NVMF_AQ_DEPTH - NVME_RDMA_NR_AEN_COMMANDS) | |
60 | ||
61 | struct nvme_rdma_device { | |
62 | struct ib_device *dev; | |
63 | struct ib_pd *pd; | |
64 | struct ib_mr *mr; | |
65 | struct kref ref; | |
66 | struct list_head entry; | |
67 | }; | |
68 | ||
69 | struct nvme_rdma_qe { | |
70 | struct ib_cqe cqe; | |
71 | void *data; | |
72 | u64 dma; | |
73 | }; | |
74 | ||
75 | struct nvme_rdma_queue; | |
76 | struct nvme_rdma_request { | |
77 | struct ib_mr *mr; | |
78 | struct nvme_rdma_qe sqe; | |
79 | struct ib_sge sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS]; | |
80 | u32 num_sge; | |
81 | int nents; | |
82 | bool inline_data; | |
83 | bool need_inval; | |
84 | struct ib_reg_wr reg_wr; | |
85 | struct ib_cqe reg_cqe; | |
86 | struct nvme_rdma_queue *queue; | |
87 | struct sg_table sg_table; | |
88 | struct scatterlist first_sgl[]; | |
89 | }; | |
90 | ||
91 | enum nvme_rdma_queue_flags { | |
92 | NVME_RDMA_Q_CONNECTED = (1 << 0), | |
93 | }; | |
94 | ||
95 | struct nvme_rdma_queue { | |
96 | struct nvme_rdma_qe *rsp_ring; | |
97 | u8 sig_count; | |
98 | int queue_size; | |
99 | size_t cmnd_capsule_len; | |
100 | struct nvme_rdma_ctrl *ctrl; | |
101 | struct nvme_rdma_device *device; | |
102 | struct ib_cq *ib_cq; | |
103 | struct ib_qp *qp; | |
104 | ||
105 | unsigned long flags; | |
106 | struct rdma_cm_id *cm_id; | |
107 | int cm_error; | |
108 | struct completion cm_done; | |
109 | }; | |
110 | ||
111 | struct nvme_rdma_ctrl { | |
112 | /* read and written in the hot path */ | |
113 | spinlock_t lock; | |
114 | ||
115 | /* read only in the hot path */ | |
116 | struct nvme_rdma_queue *queues; | |
117 | u32 queue_count; | |
118 | ||
119 | /* other member variables */ | |
71102307 CH |
120 | struct blk_mq_tag_set tag_set; |
121 | struct work_struct delete_work; | |
122 | struct work_struct reset_work; | |
123 | struct work_struct err_work; | |
124 | ||
125 | struct nvme_rdma_qe async_event_sqe; | |
126 | ||
127 | int reconnect_delay; | |
128 | struct delayed_work reconnect_work; | |
129 | ||
130 | struct list_head list; | |
131 | ||
132 | struct blk_mq_tag_set admin_tag_set; | |
133 | struct nvme_rdma_device *device; | |
134 | ||
135 | u64 cap; | |
136 | u32 max_fr_pages; | |
137 | ||
138 | union { | |
139 | struct sockaddr addr; | |
140 | struct sockaddr_in addr_in; | |
141 | }; | |
142 | ||
143 | struct nvme_ctrl ctrl; | |
144 | }; | |
145 | ||
146 | static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl) | |
147 | { | |
148 | return container_of(ctrl, struct nvme_rdma_ctrl, ctrl); | |
149 | } | |
150 | ||
151 | static LIST_HEAD(device_list); | |
152 | static DEFINE_MUTEX(device_list_mutex); | |
153 | ||
154 | static LIST_HEAD(nvme_rdma_ctrl_list); | |
155 | static DEFINE_MUTEX(nvme_rdma_ctrl_mutex); | |
156 | ||
157 | static struct workqueue_struct *nvme_rdma_wq; | |
158 | ||
159 | /* | |
160 | * Disabling this option makes small I/O goes faster, but is fundamentally | |
161 | * unsafe. With it turned off we will have to register a global rkey that | |
162 | * allows read and write access to all physical memory. | |
163 | */ | |
164 | static bool register_always = true; | |
165 | module_param(register_always, bool, 0444); | |
166 | MODULE_PARM_DESC(register_always, | |
167 | "Use memory registration even for contiguous memory regions"); | |
168 | ||
169 | static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, | |
170 | struct rdma_cm_event *event); | |
171 | static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc); | |
172 | static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl); | |
173 | ||
174 | /* XXX: really should move to a generic header sooner or later.. */ | |
175 | static inline void put_unaligned_le24(u32 val, u8 *p) | |
176 | { | |
177 | *p++ = val; | |
178 | *p++ = val >> 8; | |
179 | *p++ = val >> 16; | |
180 | } | |
181 | ||
182 | static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue) | |
183 | { | |
184 | return queue - queue->ctrl->queues; | |
185 | } | |
186 | ||
187 | static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue) | |
188 | { | |
189 | return queue->cmnd_capsule_len - sizeof(struct nvme_command); | |
190 | } | |
191 | ||
192 | static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe, | |
193 | size_t capsule_size, enum dma_data_direction dir) | |
194 | { | |
195 | ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir); | |
196 | kfree(qe->data); | |
197 | } | |
198 | ||
199 | static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe, | |
200 | size_t capsule_size, enum dma_data_direction dir) | |
201 | { | |
202 | qe->data = kzalloc(capsule_size, GFP_KERNEL); | |
203 | if (!qe->data) | |
204 | return -ENOMEM; | |
205 | ||
206 | qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir); | |
207 | if (ib_dma_mapping_error(ibdev, qe->dma)) { | |
208 | kfree(qe->data); | |
209 | return -ENOMEM; | |
210 | } | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static void nvme_rdma_free_ring(struct ib_device *ibdev, | |
216 | struct nvme_rdma_qe *ring, size_t ib_queue_size, | |
217 | size_t capsule_size, enum dma_data_direction dir) | |
218 | { | |
219 | int i; | |
220 | ||
221 | for (i = 0; i < ib_queue_size; i++) | |
222 | nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir); | |
223 | kfree(ring); | |
224 | } | |
225 | ||
226 | static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev, | |
227 | size_t ib_queue_size, size_t capsule_size, | |
228 | enum dma_data_direction dir) | |
229 | { | |
230 | struct nvme_rdma_qe *ring; | |
231 | int i; | |
232 | ||
233 | ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL); | |
234 | if (!ring) | |
235 | return NULL; | |
236 | ||
237 | for (i = 0; i < ib_queue_size; i++) { | |
238 | if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir)) | |
239 | goto out_free_ring; | |
240 | } | |
241 | ||
242 | return ring; | |
243 | ||
244 | out_free_ring: | |
245 | nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir); | |
246 | return NULL; | |
247 | } | |
248 | ||
249 | static void nvme_rdma_qp_event(struct ib_event *event, void *context) | |
250 | { | |
251 | pr_debug("QP event %d\n", event->event); | |
252 | } | |
253 | ||
254 | static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue) | |
255 | { | |
256 | wait_for_completion_interruptible_timeout(&queue->cm_done, | |
257 | msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1); | |
258 | return queue->cm_error; | |
259 | } | |
260 | ||
261 | static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor) | |
262 | { | |
263 | struct nvme_rdma_device *dev = queue->device; | |
264 | struct ib_qp_init_attr init_attr; | |
265 | int ret; | |
266 | ||
267 | memset(&init_attr, 0, sizeof(init_attr)); | |
268 | init_attr.event_handler = nvme_rdma_qp_event; | |
269 | /* +1 for drain */ | |
270 | init_attr.cap.max_send_wr = factor * queue->queue_size + 1; | |
271 | /* +1 for drain */ | |
272 | init_attr.cap.max_recv_wr = queue->queue_size + 1; | |
273 | init_attr.cap.max_recv_sge = 1; | |
274 | init_attr.cap.max_send_sge = 1 + NVME_RDMA_MAX_INLINE_SEGMENTS; | |
275 | init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
276 | init_attr.qp_type = IB_QPT_RC; | |
277 | init_attr.send_cq = queue->ib_cq; | |
278 | init_attr.recv_cq = queue->ib_cq; | |
279 | ||
280 | ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr); | |
281 | ||
282 | queue->qp = queue->cm_id->qp; | |
283 | return ret; | |
284 | } | |
285 | ||
286 | static int nvme_rdma_reinit_request(void *data, struct request *rq) | |
287 | { | |
288 | struct nvme_rdma_ctrl *ctrl = data; | |
289 | struct nvme_rdma_device *dev = ctrl->device; | |
290 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
291 | int ret = 0; | |
292 | ||
293 | if (!req->need_inval) | |
294 | goto out; | |
295 | ||
296 | ib_dereg_mr(req->mr); | |
297 | ||
298 | req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG, | |
299 | ctrl->max_fr_pages); | |
300 | if (IS_ERR(req->mr)) { | |
71102307 | 301 | ret = PTR_ERR(req->mr); |
458a9632 | 302 | req->mr = NULL; |
71102307 CH |
303 | } |
304 | ||
305 | req->need_inval = false; | |
306 | ||
307 | out: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | static void __nvme_rdma_exit_request(struct nvme_rdma_ctrl *ctrl, | |
312 | struct request *rq, unsigned int queue_idx) | |
313 | { | |
314 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
315 | struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx]; | |
316 | struct nvme_rdma_device *dev = queue->device; | |
317 | ||
318 | if (req->mr) | |
319 | ib_dereg_mr(req->mr); | |
320 | ||
321 | nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command), | |
322 | DMA_TO_DEVICE); | |
323 | } | |
324 | ||
325 | static void nvme_rdma_exit_request(void *data, struct request *rq, | |
326 | unsigned int hctx_idx, unsigned int rq_idx) | |
327 | { | |
328 | return __nvme_rdma_exit_request(data, rq, hctx_idx + 1); | |
329 | } | |
330 | ||
331 | static void nvme_rdma_exit_admin_request(void *data, struct request *rq, | |
332 | unsigned int hctx_idx, unsigned int rq_idx) | |
333 | { | |
334 | return __nvme_rdma_exit_request(data, rq, 0); | |
335 | } | |
336 | ||
337 | static int __nvme_rdma_init_request(struct nvme_rdma_ctrl *ctrl, | |
338 | struct request *rq, unsigned int queue_idx) | |
339 | { | |
340 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
341 | struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx]; | |
342 | struct nvme_rdma_device *dev = queue->device; | |
343 | struct ib_device *ibdev = dev->dev; | |
344 | int ret; | |
345 | ||
346 | BUG_ON(queue_idx >= ctrl->queue_count); | |
347 | ||
348 | ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command), | |
349 | DMA_TO_DEVICE); | |
350 | if (ret) | |
351 | return ret; | |
352 | ||
353 | req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG, | |
354 | ctrl->max_fr_pages); | |
355 | if (IS_ERR(req->mr)) { | |
356 | ret = PTR_ERR(req->mr); | |
357 | goto out_free_qe; | |
358 | } | |
359 | ||
360 | req->queue = queue; | |
361 | ||
362 | return 0; | |
363 | ||
364 | out_free_qe: | |
365 | nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command), | |
366 | DMA_TO_DEVICE); | |
367 | return -ENOMEM; | |
368 | } | |
369 | ||
370 | static int nvme_rdma_init_request(void *data, struct request *rq, | |
371 | unsigned int hctx_idx, unsigned int rq_idx, | |
372 | unsigned int numa_node) | |
373 | { | |
374 | return __nvme_rdma_init_request(data, rq, hctx_idx + 1); | |
375 | } | |
376 | ||
377 | static int nvme_rdma_init_admin_request(void *data, struct request *rq, | |
378 | unsigned int hctx_idx, unsigned int rq_idx, | |
379 | unsigned int numa_node) | |
380 | { | |
381 | return __nvme_rdma_init_request(data, rq, 0); | |
382 | } | |
383 | ||
384 | static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
385 | unsigned int hctx_idx) | |
386 | { | |
387 | struct nvme_rdma_ctrl *ctrl = data; | |
388 | struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1]; | |
389 | ||
390 | BUG_ON(hctx_idx >= ctrl->queue_count); | |
391 | ||
392 | hctx->driver_data = queue; | |
393 | return 0; | |
394 | } | |
395 | ||
396 | static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, | |
397 | unsigned int hctx_idx) | |
398 | { | |
399 | struct nvme_rdma_ctrl *ctrl = data; | |
400 | struct nvme_rdma_queue *queue = &ctrl->queues[0]; | |
401 | ||
402 | BUG_ON(hctx_idx != 0); | |
403 | ||
404 | hctx->driver_data = queue; | |
405 | return 0; | |
406 | } | |
407 | ||
408 | static void nvme_rdma_free_dev(struct kref *ref) | |
409 | { | |
410 | struct nvme_rdma_device *ndev = | |
411 | container_of(ref, struct nvme_rdma_device, ref); | |
412 | ||
413 | mutex_lock(&device_list_mutex); | |
414 | list_del(&ndev->entry); | |
415 | mutex_unlock(&device_list_mutex); | |
416 | ||
417 | if (!register_always) | |
418 | ib_dereg_mr(ndev->mr); | |
419 | ib_dealloc_pd(ndev->pd); | |
420 | ||
421 | kfree(ndev); | |
422 | } | |
423 | ||
424 | static void nvme_rdma_dev_put(struct nvme_rdma_device *dev) | |
425 | { | |
426 | kref_put(&dev->ref, nvme_rdma_free_dev); | |
427 | } | |
428 | ||
429 | static int nvme_rdma_dev_get(struct nvme_rdma_device *dev) | |
430 | { | |
431 | return kref_get_unless_zero(&dev->ref); | |
432 | } | |
433 | ||
434 | static struct nvme_rdma_device * | |
435 | nvme_rdma_find_get_device(struct rdma_cm_id *cm_id) | |
436 | { | |
437 | struct nvme_rdma_device *ndev; | |
438 | ||
439 | mutex_lock(&device_list_mutex); | |
440 | list_for_each_entry(ndev, &device_list, entry) { | |
441 | if (ndev->dev->node_guid == cm_id->device->node_guid && | |
442 | nvme_rdma_dev_get(ndev)) | |
443 | goto out_unlock; | |
444 | } | |
445 | ||
446 | ndev = kzalloc(sizeof(*ndev), GFP_KERNEL); | |
447 | if (!ndev) | |
448 | goto out_err; | |
449 | ||
450 | ndev->dev = cm_id->device; | |
451 | kref_init(&ndev->ref); | |
452 | ||
453 | ndev->pd = ib_alloc_pd(ndev->dev); | |
454 | if (IS_ERR(ndev->pd)) | |
455 | goto out_free_dev; | |
456 | ||
457 | if (!register_always) { | |
458 | ndev->mr = ib_get_dma_mr(ndev->pd, | |
459 | IB_ACCESS_LOCAL_WRITE | | |
460 | IB_ACCESS_REMOTE_READ | | |
461 | IB_ACCESS_REMOTE_WRITE); | |
462 | if (IS_ERR(ndev->mr)) | |
463 | goto out_free_pd; | |
464 | } | |
465 | ||
466 | if (!(ndev->dev->attrs.device_cap_flags & | |
467 | IB_DEVICE_MEM_MGT_EXTENSIONS)) { | |
468 | dev_err(&ndev->dev->dev, | |
469 | "Memory registrations not supported.\n"); | |
470 | goto out_free_mr; | |
471 | } | |
472 | ||
473 | list_add(&ndev->entry, &device_list); | |
474 | out_unlock: | |
475 | mutex_unlock(&device_list_mutex); | |
476 | return ndev; | |
477 | ||
478 | out_free_mr: | |
479 | if (!register_always) | |
480 | ib_dereg_mr(ndev->mr); | |
481 | out_free_pd: | |
482 | ib_dealloc_pd(ndev->pd); | |
483 | out_free_dev: | |
484 | kfree(ndev); | |
485 | out_err: | |
486 | mutex_unlock(&device_list_mutex); | |
487 | return NULL; | |
488 | } | |
489 | ||
490 | static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue) | |
491 | { | |
492 | struct nvme_rdma_device *dev = queue->device; | |
493 | struct ib_device *ibdev = dev->dev; | |
494 | ||
495 | rdma_destroy_qp(queue->cm_id); | |
496 | ib_free_cq(queue->ib_cq); | |
497 | ||
498 | nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size, | |
499 | sizeof(struct nvme_completion), DMA_FROM_DEVICE); | |
500 | ||
501 | nvme_rdma_dev_put(dev); | |
502 | } | |
503 | ||
504 | static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue, | |
505 | struct nvme_rdma_device *dev) | |
506 | { | |
507 | struct ib_device *ibdev = dev->dev; | |
508 | const int send_wr_factor = 3; /* MR, SEND, INV */ | |
509 | const int cq_factor = send_wr_factor + 1; /* + RECV */ | |
510 | int comp_vector, idx = nvme_rdma_queue_idx(queue); | |
511 | ||
512 | int ret; | |
513 | ||
514 | queue->device = dev; | |
515 | ||
516 | /* | |
517 | * The admin queue is barely used once the controller is live, so don't | |
518 | * bother to spread it out. | |
519 | */ | |
520 | if (idx == 0) | |
521 | comp_vector = 0; | |
522 | else | |
523 | comp_vector = idx % ibdev->num_comp_vectors; | |
524 | ||
525 | ||
526 | /* +1 for ib_stop_cq */ | |
527 | queue->ib_cq = ib_alloc_cq(dev->dev, queue, | |
528 | cq_factor * queue->queue_size + 1, comp_vector, | |
529 | IB_POLL_SOFTIRQ); | |
530 | if (IS_ERR(queue->ib_cq)) { | |
531 | ret = PTR_ERR(queue->ib_cq); | |
532 | goto out; | |
533 | } | |
534 | ||
535 | ret = nvme_rdma_create_qp(queue, send_wr_factor); | |
536 | if (ret) | |
537 | goto out_destroy_ib_cq; | |
538 | ||
539 | queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size, | |
540 | sizeof(struct nvme_completion), DMA_FROM_DEVICE); | |
541 | if (!queue->rsp_ring) { | |
542 | ret = -ENOMEM; | |
543 | goto out_destroy_qp; | |
544 | } | |
545 | ||
546 | return 0; | |
547 | ||
548 | out_destroy_qp: | |
549 | ib_destroy_qp(queue->qp); | |
550 | out_destroy_ib_cq: | |
551 | ib_free_cq(queue->ib_cq); | |
552 | out: | |
553 | return ret; | |
554 | } | |
555 | ||
556 | static int nvme_rdma_init_queue(struct nvme_rdma_ctrl *ctrl, | |
557 | int idx, size_t queue_size) | |
558 | { | |
559 | struct nvme_rdma_queue *queue; | |
560 | int ret; | |
561 | ||
562 | queue = &ctrl->queues[idx]; | |
563 | queue->ctrl = ctrl; | |
564 | init_completion(&queue->cm_done); | |
565 | ||
566 | if (idx > 0) | |
567 | queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16; | |
568 | else | |
569 | queue->cmnd_capsule_len = sizeof(struct nvme_command); | |
570 | ||
571 | queue->queue_size = queue_size; | |
572 | ||
573 | queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue, | |
574 | RDMA_PS_TCP, IB_QPT_RC); | |
575 | if (IS_ERR(queue->cm_id)) { | |
576 | dev_info(ctrl->ctrl.device, | |
577 | "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id)); | |
578 | return PTR_ERR(queue->cm_id); | |
579 | } | |
580 | ||
581 | queue->cm_error = -ETIMEDOUT; | |
582 | ret = rdma_resolve_addr(queue->cm_id, NULL, &ctrl->addr, | |
583 | NVME_RDMA_CONNECT_TIMEOUT_MS); | |
584 | if (ret) { | |
585 | dev_info(ctrl->ctrl.device, | |
586 | "rdma_resolve_addr failed (%d).\n", ret); | |
587 | goto out_destroy_cm_id; | |
588 | } | |
589 | ||
590 | ret = nvme_rdma_wait_for_cm(queue); | |
591 | if (ret) { | |
592 | dev_info(ctrl->ctrl.device, | |
593 | "rdma_resolve_addr wait failed (%d).\n", ret); | |
594 | goto out_destroy_cm_id; | |
595 | } | |
596 | ||
597 | set_bit(NVME_RDMA_Q_CONNECTED, &queue->flags); | |
598 | ||
599 | return 0; | |
600 | ||
601 | out_destroy_cm_id: | |
602 | rdma_destroy_id(queue->cm_id); | |
603 | return ret; | |
604 | } | |
605 | ||
606 | static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue) | |
607 | { | |
608 | rdma_disconnect(queue->cm_id); | |
609 | ib_drain_qp(queue->qp); | |
610 | } | |
611 | ||
612 | static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue) | |
613 | { | |
614 | nvme_rdma_destroy_queue_ib(queue); | |
615 | rdma_destroy_id(queue->cm_id); | |
616 | } | |
617 | ||
618 | static void nvme_rdma_stop_and_free_queue(struct nvme_rdma_queue *queue) | |
619 | { | |
620 | if (!test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags)) | |
621 | return; | |
622 | nvme_rdma_stop_queue(queue); | |
623 | nvme_rdma_free_queue(queue); | |
624 | } | |
625 | ||
626 | static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl) | |
627 | { | |
628 | int i; | |
629 | ||
630 | for (i = 1; i < ctrl->queue_count; i++) | |
631 | nvme_rdma_stop_and_free_queue(&ctrl->queues[i]); | |
632 | } | |
633 | ||
634 | static int nvme_rdma_connect_io_queues(struct nvme_rdma_ctrl *ctrl) | |
635 | { | |
636 | int i, ret = 0; | |
637 | ||
638 | for (i = 1; i < ctrl->queue_count; i++) { | |
639 | ret = nvmf_connect_io_queue(&ctrl->ctrl, i); | |
640 | if (ret) | |
641 | break; | |
642 | } | |
643 | ||
644 | return ret; | |
645 | } | |
646 | ||
647 | static int nvme_rdma_init_io_queues(struct nvme_rdma_ctrl *ctrl) | |
648 | { | |
649 | int i, ret; | |
650 | ||
651 | for (i = 1; i < ctrl->queue_count; i++) { | |
652 | ret = nvme_rdma_init_queue(ctrl, i, ctrl->ctrl.sqsize); | |
653 | if (ret) { | |
654 | dev_info(ctrl->ctrl.device, | |
655 | "failed to initialize i/o queue: %d\n", ret); | |
656 | goto out_free_queues; | |
657 | } | |
658 | } | |
659 | ||
660 | return 0; | |
661 | ||
662 | out_free_queues: | |
663 | for (; i >= 1; i--) | |
664 | nvme_rdma_stop_and_free_queue(&ctrl->queues[i]); | |
665 | ||
666 | return ret; | |
667 | } | |
668 | ||
669 | static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl) | |
670 | { | |
671 | nvme_rdma_free_qe(ctrl->queues[0].device->dev, &ctrl->async_event_sqe, | |
672 | sizeof(struct nvme_command), DMA_TO_DEVICE); | |
673 | nvme_rdma_stop_and_free_queue(&ctrl->queues[0]); | |
674 | blk_cleanup_queue(ctrl->ctrl.admin_q); | |
675 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
676 | nvme_rdma_dev_put(ctrl->device); | |
677 | } | |
678 | ||
679 | static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl) | |
680 | { | |
681 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); | |
682 | ||
683 | if (list_empty(&ctrl->list)) | |
684 | goto free_ctrl; | |
685 | ||
686 | mutex_lock(&nvme_rdma_ctrl_mutex); | |
687 | list_del(&ctrl->list); | |
688 | mutex_unlock(&nvme_rdma_ctrl_mutex); | |
689 | ||
690 | if (ctrl->ctrl.tagset) { | |
691 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
692 | blk_mq_free_tag_set(&ctrl->tag_set); | |
693 | nvme_rdma_dev_put(ctrl->device); | |
694 | } | |
695 | kfree(ctrl->queues); | |
696 | nvmf_free_options(nctrl->opts); | |
697 | free_ctrl: | |
698 | kfree(ctrl); | |
699 | } | |
700 | ||
701 | static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work) | |
702 | { | |
703 | struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work), | |
704 | struct nvme_rdma_ctrl, reconnect_work); | |
705 | bool changed; | |
706 | int ret; | |
707 | ||
708 | if (ctrl->queue_count > 1) { | |
709 | nvme_rdma_free_io_queues(ctrl); | |
710 | ||
711 | ret = blk_mq_reinit_tagset(&ctrl->tag_set); | |
712 | if (ret) | |
713 | goto requeue; | |
714 | } | |
715 | ||
716 | nvme_rdma_stop_and_free_queue(&ctrl->queues[0]); | |
717 | ||
718 | ret = blk_mq_reinit_tagset(&ctrl->admin_tag_set); | |
719 | if (ret) | |
720 | goto requeue; | |
721 | ||
722 | ret = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH); | |
723 | if (ret) | |
724 | goto requeue; | |
725 | ||
726 | blk_mq_start_stopped_hw_queues(ctrl->ctrl.admin_q, true); | |
727 | ||
728 | ret = nvmf_connect_admin_queue(&ctrl->ctrl); | |
729 | if (ret) | |
730 | goto stop_admin_q; | |
731 | ||
732 | ret = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap); | |
733 | if (ret) | |
734 | goto stop_admin_q; | |
735 | ||
736 | nvme_start_keep_alive(&ctrl->ctrl); | |
737 | ||
738 | if (ctrl->queue_count > 1) { | |
739 | ret = nvme_rdma_init_io_queues(ctrl); | |
740 | if (ret) | |
741 | goto stop_admin_q; | |
742 | ||
743 | ret = nvme_rdma_connect_io_queues(ctrl); | |
744 | if (ret) | |
745 | goto stop_admin_q; | |
746 | } | |
747 | ||
748 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
749 | WARN_ON_ONCE(!changed); | |
750 | ||
751 | if (ctrl->queue_count > 1) | |
752 | nvme_start_queues(&ctrl->ctrl); | |
753 | ||
754 | dev_info(ctrl->ctrl.device, "Successfully reconnected\n"); | |
755 | ||
756 | return; | |
757 | ||
758 | stop_admin_q: | |
759 | blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); | |
760 | requeue: | |
761 | /* Make sure we are not resetting/deleting */ | |
762 | if (ctrl->ctrl.state == NVME_CTRL_RECONNECTING) { | |
763 | dev_info(ctrl->ctrl.device, | |
764 | "Failed reconnect attempt, requeueing...\n"); | |
765 | queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work, | |
766 | ctrl->reconnect_delay * HZ); | |
767 | } | |
768 | } | |
769 | ||
770 | static void nvme_rdma_error_recovery_work(struct work_struct *work) | |
771 | { | |
772 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
773 | struct nvme_rdma_ctrl, err_work); | |
774 | ||
775 | nvme_stop_keep_alive(&ctrl->ctrl); | |
776 | if (ctrl->queue_count > 1) | |
777 | nvme_stop_queues(&ctrl->ctrl); | |
778 | blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); | |
779 | ||
780 | /* We must take care of fastfail/requeue all our inflight requests */ | |
781 | if (ctrl->queue_count > 1) | |
782 | blk_mq_tagset_busy_iter(&ctrl->tag_set, | |
783 | nvme_cancel_request, &ctrl->ctrl); | |
784 | blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, | |
785 | nvme_cancel_request, &ctrl->ctrl); | |
786 | ||
787 | dev_info(ctrl->ctrl.device, "reconnecting in %d seconds\n", | |
788 | ctrl->reconnect_delay); | |
789 | ||
790 | queue_delayed_work(nvme_rdma_wq, &ctrl->reconnect_work, | |
791 | ctrl->reconnect_delay * HZ); | |
792 | } | |
793 | ||
794 | static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl) | |
795 | { | |
796 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) | |
797 | return; | |
798 | ||
799 | queue_work(nvme_rdma_wq, &ctrl->err_work); | |
800 | } | |
801 | ||
802 | static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc, | |
803 | const char *op) | |
804 | { | |
805 | struct nvme_rdma_queue *queue = cq->cq_context; | |
806 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
807 | ||
808 | if (ctrl->ctrl.state == NVME_CTRL_LIVE) | |
809 | dev_info(ctrl->ctrl.device, | |
810 | "%s for CQE 0x%p failed with status %s (%d)\n", | |
811 | op, wc->wr_cqe, | |
812 | ib_wc_status_msg(wc->status), wc->status); | |
813 | nvme_rdma_error_recovery(ctrl); | |
814 | } | |
815 | ||
816 | static void nvme_rdma_memreg_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, "MEMREG"); | |
820 | } | |
821 | ||
822 | static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc) | |
823 | { | |
824 | if (unlikely(wc->status != IB_WC_SUCCESS)) | |
825 | nvme_rdma_wr_error(cq, wc, "LOCAL_INV"); | |
826 | } | |
827 | ||
828 | static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue, | |
829 | struct nvme_rdma_request *req) | |
830 | { | |
831 | struct ib_send_wr *bad_wr; | |
832 | struct ib_send_wr wr = { | |
833 | .opcode = IB_WR_LOCAL_INV, | |
834 | .next = NULL, | |
835 | .num_sge = 0, | |
836 | .send_flags = 0, | |
837 | .ex.invalidate_rkey = req->mr->rkey, | |
838 | }; | |
839 | ||
840 | req->reg_cqe.done = nvme_rdma_inv_rkey_done; | |
841 | wr.wr_cqe = &req->reg_cqe; | |
842 | ||
843 | return ib_post_send(queue->qp, &wr, &bad_wr); | |
844 | } | |
845 | ||
846 | static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue, | |
847 | struct request *rq) | |
848 | { | |
849 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
850 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
851 | struct nvme_rdma_device *dev = queue->device; | |
852 | struct ib_device *ibdev = dev->dev; | |
853 | int res; | |
854 | ||
855 | if (!blk_rq_bytes(rq)) | |
856 | return; | |
857 | ||
858 | if (req->need_inval) { | |
859 | res = nvme_rdma_inv_rkey(queue, req); | |
860 | if (res < 0) { | |
861 | dev_err(ctrl->ctrl.device, | |
862 | "Queueing INV WR for rkey %#x failed (%d)\n", | |
863 | req->mr->rkey, res); | |
864 | nvme_rdma_error_recovery(queue->ctrl); | |
865 | } | |
866 | } | |
867 | ||
868 | ib_dma_unmap_sg(ibdev, req->sg_table.sgl, | |
869 | req->nents, rq_data_dir(rq) == | |
870 | WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
871 | ||
872 | nvme_cleanup_cmd(rq); | |
873 | sg_free_table_chained(&req->sg_table, true); | |
874 | } | |
875 | ||
876 | static int nvme_rdma_set_sg_null(struct nvme_command *c) | |
877 | { | |
878 | struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; | |
879 | ||
880 | sg->addr = 0; | |
881 | put_unaligned_le24(0, sg->length); | |
882 | put_unaligned_le32(0, sg->key); | |
883 | sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4; | |
884 | return 0; | |
885 | } | |
886 | ||
887 | static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue, | |
888 | struct nvme_rdma_request *req, struct nvme_command *c) | |
889 | { | |
890 | struct nvme_sgl_desc *sg = &c->common.dptr.sgl; | |
891 | ||
892 | req->sge[1].addr = sg_dma_address(req->sg_table.sgl); | |
893 | req->sge[1].length = sg_dma_len(req->sg_table.sgl); | |
894 | req->sge[1].lkey = queue->device->pd->local_dma_lkey; | |
895 | ||
896 | sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff); | |
897 | sg->length = cpu_to_le32(sg_dma_len(req->sg_table.sgl)); | |
898 | sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET; | |
899 | ||
900 | req->inline_data = true; | |
901 | req->num_sge++; | |
902 | return 0; | |
903 | } | |
904 | ||
905 | static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue, | |
906 | struct nvme_rdma_request *req, struct nvme_command *c) | |
907 | { | |
908 | struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; | |
909 | ||
910 | sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl)); | |
911 | put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length); | |
912 | put_unaligned_le32(queue->device->mr->rkey, sg->key); | |
913 | sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4; | |
914 | return 0; | |
915 | } | |
916 | ||
917 | static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue, | |
918 | struct nvme_rdma_request *req, struct nvme_command *c, | |
919 | int count) | |
920 | { | |
921 | struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl; | |
922 | int nr; | |
923 | ||
924 | nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, PAGE_SIZE); | |
925 | if (nr < count) { | |
926 | if (nr < 0) | |
927 | return nr; | |
928 | return -EINVAL; | |
929 | } | |
930 | ||
931 | ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey)); | |
932 | ||
933 | req->reg_cqe.done = nvme_rdma_memreg_done; | |
934 | memset(&req->reg_wr, 0, sizeof(req->reg_wr)); | |
935 | req->reg_wr.wr.opcode = IB_WR_REG_MR; | |
936 | req->reg_wr.wr.wr_cqe = &req->reg_cqe; | |
937 | req->reg_wr.wr.num_sge = 0; | |
938 | req->reg_wr.mr = req->mr; | |
939 | req->reg_wr.key = req->mr->rkey; | |
940 | req->reg_wr.access = IB_ACCESS_LOCAL_WRITE | | |
941 | IB_ACCESS_REMOTE_READ | | |
942 | IB_ACCESS_REMOTE_WRITE; | |
943 | ||
944 | req->need_inval = true; | |
945 | ||
946 | sg->addr = cpu_to_le64(req->mr->iova); | |
947 | put_unaligned_le24(req->mr->length, sg->length); | |
948 | put_unaligned_le32(req->mr->rkey, sg->key); | |
949 | sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) | | |
950 | NVME_SGL_FMT_INVALIDATE; | |
951 | ||
952 | return 0; | |
953 | } | |
954 | ||
955 | static int nvme_rdma_map_data(struct nvme_rdma_queue *queue, | |
956 | struct request *rq, unsigned int map_len, | |
957 | struct nvme_command *c) | |
958 | { | |
959 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
960 | struct nvme_rdma_device *dev = queue->device; | |
961 | struct ib_device *ibdev = dev->dev; | |
962 | int nents, count; | |
963 | int ret; | |
964 | ||
965 | req->num_sge = 1; | |
966 | req->inline_data = false; | |
967 | req->need_inval = false; | |
968 | ||
969 | c->common.flags |= NVME_CMD_SGL_METABUF; | |
970 | ||
971 | if (!blk_rq_bytes(rq)) | |
972 | return nvme_rdma_set_sg_null(c); | |
973 | ||
974 | req->sg_table.sgl = req->first_sgl; | |
975 | ret = sg_alloc_table_chained(&req->sg_table, rq->nr_phys_segments, | |
976 | req->sg_table.sgl); | |
977 | if (ret) | |
978 | return -ENOMEM; | |
979 | ||
980 | nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl); | |
981 | BUG_ON(nents > rq->nr_phys_segments); | |
982 | req->nents = nents; | |
983 | ||
984 | count = ib_dma_map_sg(ibdev, req->sg_table.sgl, nents, | |
985 | rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
986 | if (unlikely(count <= 0)) { | |
987 | sg_free_table_chained(&req->sg_table, true); | |
988 | return -EIO; | |
989 | } | |
990 | ||
991 | if (count == 1) { | |
992 | if (rq_data_dir(rq) == WRITE && | |
993 | map_len <= nvme_rdma_inline_data_size(queue) && | |
994 | nvme_rdma_queue_idx(queue)) | |
995 | return nvme_rdma_map_sg_inline(queue, req, c); | |
996 | ||
997 | if (!register_always) | |
998 | return nvme_rdma_map_sg_single(queue, req, c); | |
999 | } | |
1000 | ||
1001 | return nvme_rdma_map_sg_fr(queue, req, c, count); | |
1002 | } | |
1003 | ||
1004 | static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) | |
1005 | { | |
1006 | if (unlikely(wc->status != IB_WC_SUCCESS)) | |
1007 | nvme_rdma_wr_error(cq, wc, "SEND"); | |
1008 | } | |
1009 | ||
1010 | static int nvme_rdma_post_send(struct nvme_rdma_queue *queue, | |
1011 | struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge, | |
1012 | struct ib_send_wr *first, bool flush) | |
1013 | { | |
1014 | struct ib_send_wr wr, *bad_wr; | |
1015 | int ret; | |
1016 | ||
1017 | sge->addr = qe->dma; | |
1018 | sge->length = sizeof(struct nvme_command), | |
1019 | sge->lkey = queue->device->pd->local_dma_lkey; | |
1020 | ||
1021 | qe->cqe.done = nvme_rdma_send_done; | |
1022 | ||
1023 | wr.next = NULL; | |
1024 | wr.wr_cqe = &qe->cqe; | |
1025 | wr.sg_list = sge; | |
1026 | wr.num_sge = num_sge; | |
1027 | wr.opcode = IB_WR_SEND; | |
1028 | wr.send_flags = 0; | |
1029 | ||
1030 | /* | |
1031 | * Unsignalled send completions are another giant desaster in the | |
1032 | * IB Verbs spec: If we don't regularly post signalled sends | |
1033 | * the send queue will fill up and only a QP reset will rescue us. | |
1034 | * Would have been way to obvious to handle this in hardware or | |
1035 | * at least the RDMA stack.. | |
1036 | * | |
1037 | * This messy and racy code sniplet is copy and pasted from the iSER | |
1038 | * initiator, and the magic '32' comes from there as well. | |
1039 | * | |
1040 | * Always signal the flushes. The magic request used for the flush | |
1041 | * sequencer is not allocated in our driver's tagset and it's | |
1042 | * triggered to be freed by blk_cleanup_queue(). So we need to | |
1043 | * always mark it as signaled to ensure that the "wr_cqe", which is | |
1044 | * embeded in request's payload, is not freed when __ib_process_cq() | |
1045 | * calls wr_cqe->done(). | |
1046 | */ | |
1047 | if ((++queue->sig_count % 32) == 0 || flush) | |
1048 | wr.send_flags |= IB_SEND_SIGNALED; | |
1049 | ||
1050 | if (first) | |
1051 | first->next = ≀ | |
1052 | else | |
1053 | first = ≀ | |
1054 | ||
1055 | ret = ib_post_send(queue->qp, first, &bad_wr); | |
1056 | if (ret) { | |
1057 | dev_err(queue->ctrl->ctrl.device, | |
1058 | "%s failed with error code %d\n", __func__, ret); | |
1059 | } | |
1060 | return ret; | |
1061 | } | |
1062 | ||
1063 | static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue, | |
1064 | struct nvme_rdma_qe *qe) | |
1065 | { | |
1066 | struct ib_recv_wr wr, *bad_wr; | |
1067 | struct ib_sge list; | |
1068 | int ret; | |
1069 | ||
1070 | list.addr = qe->dma; | |
1071 | list.length = sizeof(struct nvme_completion); | |
1072 | list.lkey = queue->device->pd->local_dma_lkey; | |
1073 | ||
1074 | qe->cqe.done = nvme_rdma_recv_done; | |
1075 | ||
1076 | wr.next = NULL; | |
1077 | wr.wr_cqe = &qe->cqe; | |
1078 | wr.sg_list = &list; | |
1079 | wr.num_sge = 1; | |
1080 | ||
1081 | ret = ib_post_recv(queue->qp, &wr, &bad_wr); | |
1082 | if (ret) { | |
1083 | dev_err(queue->ctrl->ctrl.device, | |
1084 | "%s failed with error code %d\n", __func__, ret); | |
1085 | } | |
1086 | return ret; | |
1087 | } | |
1088 | ||
1089 | static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue) | |
1090 | { | |
1091 | u32 queue_idx = nvme_rdma_queue_idx(queue); | |
1092 | ||
1093 | if (queue_idx == 0) | |
1094 | return queue->ctrl->admin_tag_set.tags[queue_idx]; | |
1095 | return queue->ctrl->tag_set.tags[queue_idx - 1]; | |
1096 | } | |
1097 | ||
1098 | static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg, int aer_idx) | |
1099 | { | |
1100 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg); | |
1101 | struct nvme_rdma_queue *queue = &ctrl->queues[0]; | |
1102 | struct ib_device *dev = queue->device->dev; | |
1103 | struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe; | |
1104 | struct nvme_command *cmd = sqe->data; | |
1105 | struct ib_sge sge; | |
1106 | int ret; | |
1107 | ||
1108 | if (WARN_ON_ONCE(aer_idx != 0)) | |
1109 | return; | |
1110 | ||
1111 | ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE); | |
1112 | ||
1113 | memset(cmd, 0, sizeof(*cmd)); | |
1114 | cmd->common.opcode = nvme_admin_async_event; | |
1115 | cmd->common.command_id = NVME_RDMA_AQ_BLKMQ_DEPTH; | |
1116 | cmd->common.flags |= NVME_CMD_SGL_METABUF; | |
1117 | nvme_rdma_set_sg_null(cmd); | |
1118 | ||
1119 | ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd), | |
1120 | DMA_TO_DEVICE); | |
1121 | ||
1122 | ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL, false); | |
1123 | WARN_ON_ONCE(ret); | |
1124 | } | |
1125 | ||
1126 | static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue, | |
1127 | struct nvme_completion *cqe, struct ib_wc *wc, int tag) | |
1128 | { | |
1129 | u16 status = le16_to_cpu(cqe->status); | |
1130 | struct request *rq; | |
1131 | struct nvme_rdma_request *req; | |
1132 | int ret = 0; | |
1133 | ||
1134 | status >>= 1; | |
1135 | ||
1136 | rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id); | |
1137 | if (!rq) { | |
1138 | dev_err(queue->ctrl->ctrl.device, | |
1139 | "tag 0x%x on QP %#x not found\n", | |
1140 | cqe->command_id, queue->qp->qp_num); | |
1141 | nvme_rdma_error_recovery(queue->ctrl); | |
1142 | return ret; | |
1143 | } | |
1144 | req = blk_mq_rq_to_pdu(rq); | |
1145 | ||
1146 | if (rq->cmd_type == REQ_TYPE_DRV_PRIV && rq->special) | |
1147 | memcpy(rq->special, cqe, sizeof(*cqe)); | |
1148 | ||
1149 | if (rq->tag == tag) | |
1150 | ret = 1; | |
1151 | ||
1152 | if ((wc->wc_flags & IB_WC_WITH_INVALIDATE) && | |
1153 | wc->ex.invalidate_rkey == req->mr->rkey) | |
1154 | req->need_inval = false; | |
1155 | ||
1156 | blk_mq_complete_request(rq, status); | |
1157 | ||
1158 | return ret; | |
1159 | } | |
1160 | ||
1161 | static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag) | |
1162 | { | |
1163 | struct nvme_rdma_qe *qe = | |
1164 | container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe); | |
1165 | struct nvme_rdma_queue *queue = cq->cq_context; | |
1166 | struct ib_device *ibdev = queue->device->dev; | |
1167 | struct nvme_completion *cqe = qe->data; | |
1168 | const size_t len = sizeof(struct nvme_completion); | |
1169 | int ret = 0; | |
1170 | ||
1171 | if (unlikely(wc->status != IB_WC_SUCCESS)) { | |
1172 | nvme_rdma_wr_error(cq, wc, "RECV"); | |
1173 | return 0; | |
1174 | } | |
1175 | ||
1176 | ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE); | |
1177 | /* | |
1178 | * AEN requests are special as they don't time out and can | |
1179 | * survive any kind of queue freeze and often don't respond to | |
1180 | * aborts. We don't even bother to allocate a struct request | |
1181 | * for them but rather special case them here. | |
1182 | */ | |
1183 | if (unlikely(nvme_rdma_queue_idx(queue) == 0 && | |
1184 | cqe->command_id >= NVME_RDMA_AQ_BLKMQ_DEPTH)) | |
1185 | nvme_complete_async_event(&queue->ctrl->ctrl, cqe); | |
1186 | else | |
1187 | ret = nvme_rdma_process_nvme_rsp(queue, cqe, wc, tag); | |
1188 | ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE); | |
1189 | ||
1190 | nvme_rdma_post_recv(queue, qe); | |
1191 | return ret; | |
1192 | } | |
1193 | ||
1194 | static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) | |
1195 | { | |
1196 | __nvme_rdma_recv_done(cq, wc, -1); | |
1197 | } | |
1198 | ||
1199 | static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue) | |
1200 | { | |
1201 | int ret, i; | |
1202 | ||
1203 | for (i = 0; i < queue->queue_size; i++) { | |
1204 | ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]); | |
1205 | if (ret) | |
1206 | goto out_destroy_queue_ib; | |
1207 | } | |
1208 | ||
1209 | return 0; | |
1210 | ||
1211 | out_destroy_queue_ib: | |
1212 | nvme_rdma_destroy_queue_ib(queue); | |
1213 | return ret; | |
1214 | } | |
1215 | ||
1216 | static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue, | |
1217 | struct rdma_cm_event *ev) | |
1218 | { | |
1219 | if (ev->param.conn.private_data_len) { | |
1220 | struct nvme_rdma_cm_rej *rej = | |
1221 | (struct nvme_rdma_cm_rej *)ev->param.conn.private_data; | |
1222 | ||
1223 | dev_err(queue->ctrl->ctrl.device, | |
1224 | "Connect rejected, status %d.", le16_to_cpu(rej->sts)); | |
1225 | /* XXX: Think of something clever to do here... */ | |
1226 | } else { | |
1227 | dev_err(queue->ctrl->ctrl.device, | |
1228 | "Connect rejected, no private data.\n"); | |
1229 | } | |
1230 | ||
1231 | return -ECONNRESET; | |
1232 | } | |
1233 | ||
1234 | static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue) | |
1235 | { | |
1236 | struct nvme_rdma_device *dev; | |
1237 | int ret; | |
1238 | ||
1239 | dev = nvme_rdma_find_get_device(queue->cm_id); | |
1240 | if (!dev) { | |
1241 | dev_err(queue->cm_id->device->dma_device, | |
1242 | "no client data found!\n"); | |
1243 | return -ECONNREFUSED; | |
1244 | } | |
1245 | ||
1246 | ret = nvme_rdma_create_queue_ib(queue, dev); | |
1247 | if (ret) { | |
1248 | nvme_rdma_dev_put(dev); | |
1249 | goto out; | |
1250 | } | |
1251 | ||
1252 | ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS); | |
1253 | if (ret) { | |
1254 | dev_err(queue->ctrl->ctrl.device, | |
1255 | "rdma_resolve_route failed (%d).\n", | |
1256 | queue->cm_error); | |
1257 | goto out_destroy_queue; | |
1258 | } | |
1259 | ||
1260 | return 0; | |
1261 | ||
1262 | out_destroy_queue: | |
1263 | nvme_rdma_destroy_queue_ib(queue); | |
1264 | out: | |
1265 | return ret; | |
1266 | } | |
1267 | ||
1268 | static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue) | |
1269 | { | |
1270 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
1271 | struct rdma_conn_param param = { }; | |
1272 | struct nvme_rdma_cm_req priv; | |
1273 | int ret; | |
1274 | ||
1275 | param.qp_num = queue->qp->qp_num; | |
1276 | param.flow_control = 1; | |
1277 | ||
1278 | param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom; | |
2ac17c28 SG |
1279 | /* maximum retry count */ |
1280 | param.retry_count = 7; | |
71102307 CH |
1281 | param.rnr_retry_count = 7; |
1282 | param.private_data = &priv; | |
1283 | param.private_data_len = sizeof(priv); | |
1284 | ||
1285 | priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0); | |
1286 | priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue)); | |
1287 | priv.hrqsize = cpu_to_le16(queue->queue_size); | |
1288 | priv.hsqsize = cpu_to_le16(queue->queue_size); | |
1289 | ||
1290 | ret = rdma_connect(queue->cm_id, ¶m); | |
1291 | if (ret) { | |
1292 | dev_err(ctrl->ctrl.device, | |
1293 | "rdma_connect failed (%d).\n", ret); | |
1294 | goto out_destroy_queue_ib; | |
1295 | } | |
1296 | ||
1297 | return 0; | |
1298 | ||
1299 | out_destroy_queue_ib: | |
1300 | nvme_rdma_destroy_queue_ib(queue); | |
1301 | return ret; | |
1302 | } | |
1303 | ||
1304 | /** | |
1305 | * nvme_rdma_device_unplug() - Handle RDMA device unplug | |
1306 | * @queue: Queue that owns the cm_id that caught the event | |
1307 | * | |
1308 | * DEVICE_REMOVAL event notifies us that the RDMA device is about | |
1309 | * to unplug so we should take care of destroying our RDMA resources. | |
1310 | * This event will be generated for each allocated cm_id. | |
1311 | * | |
1312 | * In our case, the RDMA resources are managed per controller and not | |
1313 | * only per queue. So the way we handle this is we trigger an implicit | |
1314 | * controller deletion upon the first DEVICE_REMOVAL event we see, and | |
1315 | * hold the event inflight until the controller deletion is completed. | |
1316 | * | |
1317 | * One exception that we need to handle is the destruction of the cm_id | |
1318 | * that caught the event. Since we hold the callout until the controller | |
1319 | * deletion is completed, we'll deadlock if the controller deletion will | |
1320 | * call rdma_destroy_id on this queue's cm_id. Thus, we claim ownership | |
1321 | * of destroying this queue before-hand, destroy the queue resources | |
1322 | * after the controller deletion completed with the exception of destroying | |
1323 | * the cm_id implicitely by returning a non-zero rc to the callout. | |
1324 | */ | |
1325 | static int nvme_rdma_device_unplug(struct nvme_rdma_queue *queue) | |
1326 | { | |
1327 | struct nvme_rdma_ctrl *ctrl = queue->ctrl; | |
1328 | int ret, ctrl_deleted = 0; | |
1329 | ||
1330 | /* First disable the queue so ctrl delete won't free it */ | |
1331 | if (!test_and_clear_bit(NVME_RDMA_Q_CONNECTED, &queue->flags)) | |
1332 | goto out; | |
1333 | ||
1334 | /* delete the controller */ | |
1335 | ret = __nvme_rdma_del_ctrl(ctrl); | |
1336 | if (!ret) { | |
1337 | dev_warn(ctrl->ctrl.device, | |
1338 | "Got rdma device removal event, deleting ctrl\n"); | |
1339 | flush_work(&ctrl->delete_work); | |
1340 | ||
1341 | /* Return non-zero so the cm_id will destroy implicitly */ | |
1342 | ctrl_deleted = 1; | |
1343 | ||
1344 | /* Free this queue ourselves */ | |
1345 | rdma_disconnect(queue->cm_id); | |
1346 | ib_drain_qp(queue->qp); | |
1347 | nvme_rdma_destroy_queue_ib(queue); | |
1348 | } | |
1349 | ||
1350 | out: | |
1351 | return ctrl_deleted; | |
1352 | } | |
1353 | ||
1354 | static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id, | |
1355 | struct rdma_cm_event *ev) | |
1356 | { | |
1357 | struct nvme_rdma_queue *queue = cm_id->context; | |
1358 | int cm_error = 0; | |
1359 | ||
1360 | dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n", | |
1361 | rdma_event_msg(ev->event), ev->event, | |
1362 | ev->status, cm_id); | |
1363 | ||
1364 | switch (ev->event) { | |
1365 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
1366 | cm_error = nvme_rdma_addr_resolved(queue); | |
1367 | break; | |
1368 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
1369 | cm_error = nvme_rdma_route_resolved(queue); | |
1370 | break; | |
1371 | case RDMA_CM_EVENT_ESTABLISHED: | |
1372 | queue->cm_error = nvme_rdma_conn_established(queue); | |
1373 | /* complete cm_done regardless of success/failure */ | |
1374 | complete(&queue->cm_done); | |
1375 | return 0; | |
1376 | case RDMA_CM_EVENT_REJECTED: | |
1377 | cm_error = nvme_rdma_conn_rejected(queue, ev); | |
1378 | break; | |
1379 | case RDMA_CM_EVENT_ADDR_ERROR: | |
1380 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
1381 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
1382 | case RDMA_CM_EVENT_UNREACHABLE: | |
1383 | dev_dbg(queue->ctrl->ctrl.device, | |
1384 | "CM error event %d\n", ev->event); | |
1385 | cm_error = -ECONNRESET; | |
1386 | break; | |
1387 | case RDMA_CM_EVENT_DISCONNECTED: | |
1388 | case RDMA_CM_EVENT_ADDR_CHANGE: | |
1389 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: | |
1390 | dev_dbg(queue->ctrl->ctrl.device, | |
1391 | "disconnect received - connection closed\n"); | |
1392 | nvme_rdma_error_recovery(queue->ctrl); | |
1393 | break; | |
1394 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
1395 | /* return 1 means impliciy CM ID destroy */ | |
1396 | return nvme_rdma_device_unplug(queue); | |
1397 | default: | |
1398 | dev_err(queue->ctrl->ctrl.device, | |
1399 | "Unexpected RDMA CM event (%d)\n", ev->event); | |
1400 | nvme_rdma_error_recovery(queue->ctrl); | |
1401 | break; | |
1402 | } | |
1403 | ||
1404 | if (cm_error) { | |
1405 | queue->cm_error = cm_error; | |
1406 | complete(&queue->cm_done); | |
1407 | } | |
1408 | ||
1409 | return 0; | |
1410 | } | |
1411 | ||
1412 | static enum blk_eh_timer_return | |
1413 | nvme_rdma_timeout(struct request *rq, bool reserved) | |
1414 | { | |
1415 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
1416 | ||
1417 | /* queue error recovery */ | |
1418 | nvme_rdma_error_recovery(req->queue->ctrl); | |
1419 | ||
1420 | /* fail with DNR on cmd timeout */ | |
1421 | rq->errors = NVME_SC_ABORT_REQ | NVME_SC_DNR; | |
1422 | ||
1423 | return BLK_EH_HANDLED; | |
1424 | } | |
1425 | ||
1426 | static int nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx, | |
1427 | const struct blk_mq_queue_data *bd) | |
1428 | { | |
1429 | struct nvme_ns *ns = hctx->queue->queuedata; | |
1430 | struct nvme_rdma_queue *queue = hctx->driver_data; | |
1431 | struct request *rq = bd->rq; | |
1432 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
1433 | struct nvme_rdma_qe *sqe = &req->sqe; | |
1434 | struct nvme_command *c = sqe->data; | |
1435 | bool flush = false; | |
1436 | struct ib_device *dev; | |
1437 | unsigned int map_len; | |
1438 | int ret; | |
1439 | ||
1440 | WARN_ON_ONCE(rq->tag < 0); | |
1441 | ||
1442 | dev = queue->device->dev; | |
1443 | ib_dma_sync_single_for_cpu(dev, sqe->dma, | |
1444 | sizeof(struct nvme_command), DMA_TO_DEVICE); | |
1445 | ||
1446 | ret = nvme_setup_cmd(ns, rq, c); | |
1447 | if (ret) | |
1448 | return ret; | |
1449 | ||
1450 | c->common.command_id = rq->tag; | |
1451 | blk_mq_start_request(rq); | |
1452 | ||
1453 | map_len = nvme_map_len(rq); | |
1454 | ret = nvme_rdma_map_data(queue, rq, map_len, c); | |
1455 | if (ret < 0) { | |
1456 | dev_err(queue->ctrl->ctrl.device, | |
1457 | "Failed to map data (%d)\n", ret); | |
1458 | nvme_cleanup_cmd(rq); | |
1459 | goto err; | |
1460 | } | |
1461 | ||
1462 | ib_dma_sync_single_for_device(dev, sqe->dma, | |
1463 | sizeof(struct nvme_command), DMA_TO_DEVICE); | |
1464 | ||
1465 | if (rq->cmd_type == REQ_TYPE_FS && req_op(rq) == REQ_OP_FLUSH) | |
1466 | flush = true; | |
1467 | ret = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge, | |
1468 | req->need_inval ? &req->reg_wr.wr : NULL, flush); | |
1469 | if (ret) { | |
1470 | nvme_rdma_unmap_data(queue, rq); | |
1471 | goto err; | |
1472 | } | |
1473 | ||
1474 | return BLK_MQ_RQ_QUEUE_OK; | |
1475 | err: | |
1476 | return (ret == -ENOMEM || ret == -EAGAIN) ? | |
1477 | BLK_MQ_RQ_QUEUE_BUSY : BLK_MQ_RQ_QUEUE_ERROR; | |
1478 | } | |
1479 | ||
1480 | static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) | |
1481 | { | |
1482 | struct nvme_rdma_queue *queue = hctx->driver_data; | |
1483 | struct ib_cq *cq = queue->ib_cq; | |
1484 | struct ib_wc wc; | |
1485 | int found = 0; | |
1486 | ||
1487 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
1488 | while (ib_poll_cq(cq, 1, &wc) > 0) { | |
1489 | struct ib_cqe *cqe = wc.wr_cqe; | |
1490 | ||
1491 | if (cqe) { | |
1492 | if (cqe->done == nvme_rdma_recv_done) | |
1493 | found |= __nvme_rdma_recv_done(cq, &wc, tag); | |
1494 | else | |
1495 | cqe->done(cq, &wc); | |
1496 | } | |
1497 | } | |
1498 | ||
1499 | return found; | |
1500 | } | |
1501 | ||
1502 | static void nvme_rdma_complete_rq(struct request *rq) | |
1503 | { | |
1504 | struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); | |
1505 | struct nvme_rdma_queue *queue = req->queue; | |
1506 | int error = 0; | |
1507 | ||
1508 | nvme_rdma_unmap_data(queue, rq); | |
1509 | ||
1510 | if (unlikely(rq->errors)) { | |
1511 | if (nvme_req_needs_retry(rq, rq->errors)) { | |
1512 | nvme_requeue_req(rq); | |
1513 | return; | |
1514 | } | |
1515 | ||
1516 | if (rq->cmd_type == REQ_TYPE_DRV_PRIV) | |
1517 | error = rq->errors; | |
1518 | else | |
1519 | error = nvme_error_status(rq->errors); | |
1520 | } | |
1521 | ||
1522 | blk_mq_end_request(rq, error); | |
1523 | } | |
1524 | ||
1525 | static struct blk_mq_ops nvme_rdma_mq_ops = { | |
1526 | .queue_rq = nvme_rdma_queue_rq, | |
1527 | .complete = nvme_rdma_complete_rq, | |
1528 | .map_queue = blk_mq_map_queue, | |
1529 | .init_request = nvme_rdma_init_request, | |
1530 | .exit_request = nvme_rdma_exit_request, | |
1531 | .reinit_request = nvme_rdma_reinit_request, | |
1532 | .init_hctx = nvme_rdma_init_hctx, | |
1533 | .poll = nvme_rdma_poll, | |
1534 | .timeout = nvme_rdma_timeout, | |
1535 | }; | |
1536 | ||
1537 | static struct blk_mq_ops nvme_rdma_admin_mq_ops = { | |
1538 | .queue_rq = nvme_rdma_queue_rq, | |
1539 | .complete = nvme_rdma_complete_rq, | |
1540 | .map_queue = blk_mq_map_queue, | |
1541 | .init_request = nvme_rdma_init_admin_request, | |
1542 | .exit_request = nvme_rdma_exit_admin_request, | |
1543 | .reinit_request = nvme_rdma_reinit_request, | |
1544 | .init_hctx = nvme_rdma_init_admin_hctx, | |
1545 | .timeout = nvme_rdma_timeout, | |
1546 | }; | |
1547 | ||
1548 | static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl) | |
1549 | { | |
1550 | int error; | |
1551 | ||
1552 | error = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH); | |
1553 | if (error) | |
1554 | return error; | |
1555 | ||
1556 | ctrl->device = ctrl->queues[0].device; | |
1557 | ||
1558 | /* | |
1559 | * We need a reference on the device as long as the tag_set is alive, | |
1560 | * as the MRs in the request structures need a valid ib_device. | |
1561 | */ | |
1562 | error = -EINVAL; | |
1563 | if (!nvme_rdma_dev_get(ctrl->device)) | |
1564 | goto out_free_queue; | |
1565 | ||
1566 | ctrl->max_fr_pages = min_t(u32, NVME_RDMA_MAX_SEGMENTS, | |
1567 | ctrl->device->dev->attrs.max_fast_reg_page_list_len); | |
1568 | ||
1569 | memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); | |
1570 | ctrl->admin_tag_set.ops = &nvme_rdma_admin_mq_ops; | |
1571 | ctrl->admin_tag_set.queue_depth = NVME_RDMA_AQ_BLKMQ_DEPTH; | |
1572 | ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ | |
1573 | ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; | |
1574 | ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_rdma_request) + | |
1575 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
1576 | ctrl->admin_tag_set.driver_data = ctrl; | |
1577 | ctrl->admin_tag_set.nr_hw_queues = 1; | |
1578 | ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; | |
1579 | ||
1580 | error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); | |
1581 | if (error) | |
1582 | goto out_put_dev; | |
1583 | ||
1584 | ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set); | |
1585 | if (IS_ERR(ctrl->ctrl.admin_q)) { | |
1586 | error = PTR_ERR(ctrl->ctrl.admin_q); | |
1587 | goto out_free_tagset; | |
1588 | } | |
1589 | ||
1590 | error = nvmf_connect_admin_queue(&ctrl->ctrl); | |
1591 | if (error) | |
1592 | goto out_cleanup_queue; | |
1593 | ||
1594 | error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap); | |
1595 | if (error) { | |
1596 | dev_err(ctrl->ctrl.device, | |
1597 | "prop_get NVME_REG_CAP failed\n"); | |
1598 | goto out_cleanup_queue; | |
1599 | } | |
1600 | ||
1601 | ctrl->ctrl.sqsize = | |
1602 | min_t(int, NVME_CAP_MQES(ctrl->cap) + 1, ctrl->ctrl.sqsize); | |
1603 | ||
1604 | error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap); | |
1605 | if (error) | |
1606 | goto out_cleanup_queue; | |
1607 | ||
1608 | ctrl->ctrl.max_hw_sectors = | |
1609 | (ctrl->max_fr_pages - 1) << (PAGE_SHIFT - 9); | |
1610 | ||
1611 | error = nvme_init_identify(&ctrl->ctrl); | |
1612 | if (error) | |
1613 | goto out_cleanup_queue; | |
1614 | ||
1615 | error = nvme_rdma_alloc_qe(ctrl->queues[0].device->dev, | |
1616 | &ctrl->async_event_sqe, sizeof(struct nvme_command), | |
1617 | DMA_TO_DEVICE); | |
1618 | if (error) | |
1619 | goto out_cleanup_queue; | |
1620 | ||
1621 | nvme_start_keep_alive(&ctrl->ctrl); | |
1622 | ||
1623 | return 0; | |
1624 | ||
1625 | out_cleanup_queue: | |
1626 | blk_cleanup_queue(ctrl->ctrl.admin_q); | |
1627 | out_free_tagset: | |
1628 | /* disconnect and drain the queue before freeing the tagset */ | |
1629 | nvme_rdma_stop_queue(&ctrl->queues[0]); | |
1630 | blk_mq_free_tag_set(&ctrl->admin_tag_set); | |
1631 | out_put_dev: | |
1632 | nvme_rdma_dev_put(ctrl->device); | |
1633 | out_free_queue: | |
1634 | nvme_rdma_free_queue(&ctrl->queues[0]); | |
1635 | return error; | |
1636 | } | |
1637 | ||
1638 | static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl) | |
1639 | { | |
1640 | nvme_stop_keep_alive(&ctrl->ctrl); | |
1641 | cancel_work_sync(&ctrl->err_work); | |
1642 | cancel_delayed_work_sync(&ctrl->reconnect_work); | |
1643 | ||
1644 | if (ctrl->queue_count > 1) { | |
1645 | nvme_stop_queues(&ctrl->ctrl); | |
1646 | blk_mq_tagset_busy_iter(&ctrl->tag_set, | |
1647 | nvme_cancel_request, &ctrl->ctrl); | |
1648 | nvme_rdma_free_io_queues(ctrl); | |
1649 | } | |
1650 | ||
1651 | if (ctrl->ctrl.state == NVME_CTRL_LIVE) | |
1652 | nvme_shutdown_ctrl(&ctrl->ctrl); | |
1653 | ||
1654 | blk_mq_stop_hw_queues(ctrl->ctrl.admin_q); | |
1655 | blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, | |
1656 | nvme_cancel_request, &ctrl->ctrl); | |
1657 | nvme_rdma_destroy_admin_queue(ctrl); | |
1658 | } | |
1659 | ||
1660 | static void nvme_rdma_del_ctrl_work(struct work_struct *work) | |
1661 | { | |
1662 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
1663 | struct nvme_rdma_ctrl, delete_work); | |
1664 | ||
1665 | nvme_remove_namespaces(&ctrl->ctrl); | |
1666 | nvme_rdma_shutdown_ctrl(ctrl); | |
1667 | nvme_uninit_ctrl(&ctrl->ctrl); | |
1668 | nvme_put_ctrl(&ctrl->ctrl); | |
1669 | } | |
1670 | ||
1671 | static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl) | |
1672 | { | |
1673 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) | |
1674 | return -EBUSY; | |
1675 | ||
1676 | if (!queue_work(nvme_rdma_wq, &ctrl->delete_work)) | |
1677 | return -EBUSY; | |
1678 | ||
1679 | return 0; | |
1680 | } | |
1681 | ||
1682 | static int nvme_rdma_del_ctrl(struct nvme_ctrl *nctrl) | |
1683 | { | |
1684 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); | |
1685 | int ret; | |
1686 | ||
1687 | ret = __nvme_rdma_del_ctrl(ctrl); | |
1688 | if (ret) | |
1689 | return ret; | |
1690 | ||
1691 | flush_work(&ctrl->delete_work); | |
1692 | ||
1693 | return 0; | |
1694 | } | |
1695 | ||
1696 | static void nvme_rdma_remove_ctrl_work(struct work_struct *work) | |
1697 | { | |
1698 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
1699 | struct nvme_rdma_ctrl, delete_work); | |
1700 | ||
1701 | nvme_remove_namespaces(&ctrl->ctrl); | |
1702 | nvme_uninit_ctrl(&ctrl->ctrl); | |
1703 | nvme_put_ctrl(&ctrl->ctrl); | |
1704 | } | |
1705 | ||
1706 | static void nvme_rdma_reset_ctrl_work(struct work_struct *work) | |
1707 | { | |
1708 | struct nvme_rdma_ctrl *ctrl = container_of(work, | |
1709 | struct nvme_rdma_ctrl, reset_work); | |
1710 | int ret; | |
1711 | bool changed; | |
1712 | ||
1713 | nvme_rdma_shutdown_ctrl(ctrl); | |
1714 | ||
1715 | ret = nvme_rdma_configure_admin_queue(ctrl); | |
1716 | if (ret) { | |
1717 | /* ctrl is already shutdown, just remove the ctrl */ | |
1718 | INIT_WORK(&ctrl->delete_work, nvme_rdma_remove_ctrl_work); | |
1719 | goto del_dead_ctrl; | |
1720 | } | |
1721 | ||
1722 | if (ctrl->queue_count > 1) { | |
1723 | ret = blk_mq_reinit_tagset(&ctrl->tag_set); | |
1724 | if (ret) | |
1725 | goto del_dead_ctrl; | |
1726 | ||
1727 | ret = nvme_rdma_init_io_queues(ctrl); | |
1728 | if (ret) | |
1729 | goto del_dead_ctrl; | |
1730 | ||
1731 | ret = nvme_rdma_connect_io_queues(ctrl); | |
1732 | if (ret) | |
1733 | goto del_dead_ctrl; | |
1734 | } | |
1735 | ||
1736 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
1737 | WARN_ON_ONCE(!changed); | |
1738 | ||
1739 | if (ctrl->queue_count > 1) { | |
1740 | nvme_start_queues(&ctrl->ctrl); | |
1741 | nvme_queue_scan(&ctrl->ctrl); | |
1742 | } | |
1743 | ||
1744 | return; | |
1745 | ||
1746 | del_dead_ctrl: | |
1747 | /* Deleting this dead controller... */ | |
1748 | dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); | |
1749 | WARN_ON(!queue_work(nvme_rdma_wq, &ctrl->delete_work)); | |
1750 | } | |
1751 | ||
1752 | static int nvme_rdma_reset_ctrl(struct nvme_ctrl *nctrl) | |
1753 | { | |
1754 | struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); | |
1755 | ||
1756 | if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING)) | |
1757 | return -EBUSY; | |
1758 | ||
1759 | if (!queue_work(nvme_rdma_wq, &ctrl->reset_work)) | |
1760 | return -EBUSY; | |
1761 | ||
1762 | flush_work(&ctrl->reset_work); | |
1763 | ||
1764 | return 0; | |
1765 | } | |
1766 | ||
1767 | static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = { | |
1768 | .name = "rdma", | |
1769 | .module = THIS_MODULE, | |
1770 | .is_fabrics = true, | |
1771 | .reg_read32 = nvmf_reg_read32, | |
1772 | .reg_read64 = nvmf_reg_read64, | |
1773 | .reg_write32 = nvmf_reg_write32, | |
1774 | .reset_ctrl = nvme_rdma_reset_ctrl, | |
1775 | .free_ctrl = nvme_rdma_free_ctrl, | |
1776 | .submit_async_event = nvme_rdma_submit_async_event, | |
1777 | .delete_ctrl = nvme_rdma_del_ctrl, | |
1778 | .get_subsysnqn = nvmf_get_subsysnqn, | |
1779 | .get_address = nvmf_get_address, | |
1780 | }; | |
1781 | ||
1782 | static int nvme_rdma_create_io_queues(struct nvme_rdma_ctrl *ctrl) | |
1783 | { | |
1784 | struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; | |
1785 | int ret; | |
1786 | ||
1787 | ret = nvme_set_queue_count(&ctrl->ctrl, &opts->nr_io_queues); | |
1788 | if (ret) | |
1789 | return ret; | |
1790 | ||
1791 | ctrl->queue_count = opts->nr_io_queues + 1; | |
1792 | if (ctrl->queue_count < 2) | |
1793 | return 0; | |
1794 | ||
1795 | dev_info(ctrl->ctrl.device, | |
1796 | "creating %d I/O queues.\n", opts->nr_io_queues); | |
1797 | ||
1798 | ret = nvme_rdma_init_io_queues(ctrl); | |
1799 | if (ret) | |
1800 | return ret; | |
1801 | ||
1802 | /* | |
1803 | * We need a reference on the device as long as the tag_set is alive, | |
1804 | * as the MRs in the request structures need a valid ib_device. | |
1805 | */ | |
1806 | ret = -EINVAL; | |
1807 | if (!nvme_rdma_dev_get(ctrl->device)) | |
1808 | goto out_free_io_queues; | |
1809 | ||
1810 | memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set)); | |
1811 | ctrl->tag_set.ops = &nvme_rdma_mq_ops; | |
1812 | ctrl->tag_set.queue_depth = ctrl->ctrl.sqsize; | |
1813 | ctrl->tag_set.reserved_tags = 1; /* fabric connect */ | |
1814 | ctrl->tag_set.numa_node = NUMA_NO_NODE; | |
1815 | ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
1816 | ctrl->tag_set.cmd_size = sizeof(struct nvme_rdma_request) + | |
1817 | SG_CHUNK_SIZE * sizeof(struct scatterlist); | |
1818 | ctrl->tag_set.driver_data = ctrl; | |
1819 | ctrl->tag_set.nr_hw_queues = ctrl->queue_count - 1; | |
1820 | ctrl->tag_set.timeout = NVME_IO_TIMEOUT; | |
1821 | ||
1822 | ret = blk_mq_alloc_tag_set(&ctrl->tag_set); | |
1823 | if (ret) | |
1824 | goto out_put_dev; | |
1825 | ctrl->ctrl.tagset = &ctrl->tag_set; | |
1826 | ||
1827 | ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set); | |
1828 | if (IS_ERR(ctrl->ctrl.connect_q)) { | |
1829 | ret = PTR_ERR(ctrl->ctrl.connect_q); | |
1830 | goto out_free_tag_set; | |
1831 | } | |
1832 | ||
1833 | ret = nvme_rdma_connect_io_queues(ctrl); | |
1834 | if (ret) | |
1835 | goto out_cleanup_connect_q; | |
1836 | ||
1837 | return 0; | |
1838 | ||
1839 | out_cleanup_connect_q: | |
1840 | blk_cleanup_queue(ctrl->ctrl.connect_q); | |
1841 | out_free_tag_set: | |
1842 | blk_mq_free_tag_set(&ctrl->tag_set); | |
1843 | out_put_dev: | |
1844 | nvme_rdma_dev_put(ctrl->device); | |
1845 | out_free_io_queues: | |
1846 | nvme_rdma_free_io_queues(ctrl); | |
1847 | return ret; | |
1848 | } | |
1849 | ||
1850 | static int nvme_rdma_parse_ipaddr(struct sockaddr_in *in_addr, char *p) | |
1851 | { | |
1852 | u8 *addr = (u8 *)&in_addr->sin_addr.s_addr; | |
1853 | size_t buflen = strlen(p); | |
1854 | ||
1855 | /* XXX: handle IPv6 addresses */ | |
1856 | ||
1857 | if (buflen > INET_ADDRSTRLEN) | |
1858 | return -EINVAL; | |
1859 | if (in4_pton(p, buflen, addr, '\0', NULL) == 0) | |
1860 | return -EINVAL; | |
1861 | in_addr->sin_family = AF_INET; | |
1862 | return 0; | |
1863 | } | |
1864 | ||
1865 | static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev, | |
1866 | struct nvmf_ctrl_options *opts) | |
1867 | { | |
1868 | struct nvme_rdma_ctrl *ctrl; | |
1869 | int ret; | |
1870 | bool changed; | |
1871 | ||
1872 | ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); | |
1873 | if (!ctrl) | |
1874 | return ERR_PTR(-ENOMEM); | |
1875 | ctrl->ctrl.opts = opts; | |
1876 | INIT_LIST_HEAD(&ctrl->list); | |
1877 | ||
1878 | ret = nvme_rdma_parse_ipaddr(&ctrl->addr_in, opts->traddr); | |
1879 | if (ret) { | |
1880 | pr_err("malformed IP address passed: %s\n", opts->traddr); | |
1881 | goto out_free_ctrl; | |
1882 | } | |
1883 | ||
1884 | if (opts->mask & NVMF_OPT_TRSVCID) { | |
1885 | u16 port; | |
1886 | ||
1887 | ret = kstrtou16(opts->trsvcid, 0, &port); | |
1888 | if (ret) | |
1889 | goto out_free_ctrl; | |
1890 | ||
1891 | ctrl->addr_in.sin_port = cpu_to_be16(port); | |
1892 | } else { | |
1893 | ctrl->addr_in.sin_port = cpu_to_be16(NVME_RDMA_IP_PORT); | |
1894 | } | |
1895 | ||
1896 | ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops, | |
1897 | 0 /* no quirks, we're perfect! */); | |
1898 | if (ret) | |
1899 | goto out_free_ctrl; | |
1900 | ||
1901 | ctrl->reconnect_delay = opts->reconnect_delay; | |
1902 | INIT_DELAYED_WORK(&ctrl->reconnect_work, | |
1903 | nvme_rdma_reconnect_ctrl_work); | |
1904 | INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work); | |
1905 | INIT_WORK(&ctrl->delete_work, nvme_rdma_del_ctrl_work); | |
1906 | INIT_WORK(&ctrl->reset_work, nvme_rdma_reset_ctrl_work); | |
1907 | spin_lock_init(&ctrl->lock); | |
1908 | ||
1909 | ctrl->queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */ | |
1910 | ctrl->ctrl.sqsize = opts->queue_size; | |
71102307 CH |
1911 | ctrl->ctrl.kato = opts->kato; |
1912 | ||
1913 | ret = -ENOMEM; | |
1914 | ctrl->queues = kcalloc(ctrl->queue_count, sizeof(*ctrl->queues), | |
1915 | GFP_KERNEL); | |
1916 | if (!ctrl->queues) | |
1917 | goto out_uninit_ctrl; | |
1918 | ||
1919 | ret = nvme_rdma_configure_admin_queue(ctrl); | |
1920 | if (ret) | |
1921 | goto out_kfree_queues; | |
1922 | ||
1923 | /* sanity check icdoff */ | |
1924 | if (ctrl->ctrl.icdoff) { | |
1925 | dev_err(ctrl->ctrl.device, "icdoff is not supported!\n"); | |
1926 | goto out_remove_admin_queue; | |
1927 | } | |
1928 | ||
1929 | /* sanity check keyed sgls */ | |
1930 | if (!(ctrl->ctrl.sgls & (1 << 20))) { | |
1931 | dev_err(ctrl->ctrl.device, "Mandatory keyed sgls are not support\n"); | |
1932 | goto out_remove_admin_queue; | |
1933 | } | |
1934 | ||
1935 | if (opts->queue_size > ctrl->ctrl.maxcmd) { | |
1936 | /* warn if maxcmd is lower than queue_size */ | |
1937 | dev_warn(ctrl->ctrl.device, | |
1938 | "queue_size %zu > ctrl maxcmd %u, clamping down\n", | |
1939 | opts->queue_size, ctrl->ctrl.maxcmd); | |
1940 | opts->queue_size = ctrl->ctrl.maxcmd; | |
1941 | } | |
1942 | ||
1943 | if (opts->nr_io_queues) { | |
1944 | ret = nvme_rdma_create_io_queues(ctrl); | |
1945 | if (ret) | |
1946 | goto out_remove_admin_queue; | |
1947 | } | |
1948 | ||
1949 | changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); | |
1950 | WARN_ON_ONCE(!changed); | |
1951 | ||
1952 | dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISp\n", | |
1953 | ctrl->ctrl.opts->subsysnqn, &ctrl->addr); | |
1954 | ||
1955 | kref_get(&ctrl->ctrl.kref); | |
1956 | ||
1957 | mutex_lock(&nvme_rdma_ctrl_mutex); | |
1958 | list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list); | |
1959 | mutex_unlock(&nvme_rdma_ctrl_mutex); | |
1960 | ||
1961 | if (opts->nr_io_queues) { | |
1962 | nvme_queue_scan(&ctrl->ctrl); | |
1963 | nvme_queue_async_events(&ctrl->ctrl); | |
1964 | } | |
1965 | ||
1966 | return &ctrl->ctrl; | |
1967 | ||
1968 | out_remove_admin_queue: | |
1969 | nvme_stop_keep_alive(&ctrl->ctrl); | |
1970 | nvme_rdma_destroy_admin_queue(ctrl); | |
1971 | out_kfree_queues: | |
1972 | kfree(ctrl->queues); | |
1973 | out_uninit_ctrl: | |
1974 | nvme_uninit_ctrl(&ctrl->ctrl); | |
1975 | nvme_put_ctrl(&ctrl->ctrl); | |
1976 | if (ret > 0) | |
1977 | ret = -EIO; | |
1978 | return ERR_PTR(ret); | |
1979 | out_free_ctrl: | |
1980 | kfree(ctrl); | |
1981 | return ERR_PTR(ret); | |
1982 | } | |
1983 | ||
1984 | static struct nvmf_transport_ops nvme_rdma_transport = { | |
1985 | .name = "rdma", | |
1986 | .required_opts = NVMF_OPT_TRADDR, | |
2ac17c28 | 1987 | .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY, |
71102307 CH |
1988 | .create_ctrl = nvme_rdma_create_ctrl, |
1989 | }; | |
1990 | ||
1991 | static int __init nvme_rdma_init_module(void) | |
1992 | { | |
1993 | nvme_rdma_wq = create_workqueue("nvme_rdma_wq"); | |
1994 | if (!nvme_rdma_wq) | |
1995 | return -ENOMEM; | |
1996 | ||
1997 | nvmf_register_transport(&nvme_rdma_transport); | |
1998 | return 0; | |
1999 | } | |
2000 | ||
2001 | static void __exit nvme_rdma_cleanup_module(void) | |
2002 | { | |
2003 | struct nvme_rdma_ctrl *ctrl; | |
2004 | ||
2005 | nvmf_unregister_transport(&nvme_rdma_transport); | |
2006 | ||
2007 | mutex_lock(&nvme_rdma_ctrl_mutex); | |
2008 | list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) | |
2009 | __nvme_rdma_del_ctrl(ctrl); | |
2010 | mutex_unlock(&nvme_rdma_ctrl_mutex); | |
2011 | ||
2012 | destroy_workqueue(nvme_rdma_wq); | |
2013 | } | |
2014 | ||
2015 | module_init(nvme_rdma_init_module); | |
2016 | module_exit(nvme_rdma_cleanup_module); | |
2017 | ||
2018 | MODULE_LICENSE("GPL v2"); |