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dm writecache: add cond_resched to loop in persistent_memory_claim()
[linux/fpc-iii.git] / drivers / nvme / host / rdma.c
blobcac8a930396a0170e99c1dd85dfd6e266a5cbf53
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NVMe over Fabrics RDMA host code.
4 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
5 */
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <rdma/mr_pool.h>
11 #include <linux/err.h>
12 #include <linux/string.h>
13 #include <linux/atomic.h>
14 #include <linux/blk-mq.h>
15 #include <linux/blk-mq-rdma.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/mutex.h>
19 #include <linux/scatterlist.h>
20 #include <linux/nvme.h>
21 #include <asm/unaligned.h>
22
23 #include <rdma/ib_verbs.h>
24 #include <rdma/rdma_cm.h>
25 #include <linux/nvme-rdma.h>
26
27 #include "nvme.h"
28 #include "fabrics.h"
29
30
31 #define NVME_RDMA_CONNECT_TIMEOUT_MS 3000 /* 3 second */
32
33 #define NVME_RDMA_MAX_SEGMENTS 256
34
35 #define NVME_RDMA_MAX_INLINE_SEGMENTS 4
36
37 struct nvme_rdma_device {
38 struct ib_device *dev;
39 struct ib_pd *pd;
40 struct kref ref;
41 struct list_head entry;
42 unsigned int num_inline_segments;
43 };
44
45 struct nvme_rdma_qe {
46 struct ib_cqe cqe;
47 void *data;
48 u64 dma;
49 };
50
51 struct nvme_rdma_queue;
52 struct nvme_rdma_request {
53 struct nvme_request req;
54 struct ib_mr *mr;
55 struct nvme_rdma_qe sqe;
56 union nvme_result result;
57 __le16 status;
58 refcount_t ref;
59 struct ib_sge sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
60 u32 num_sge;
61 int nents;
62 struct ib_reg_wr reg_wr;
63 struct ib_cqe reg_cqe;
64 struct nvme_rdma_queue *queue;
65 struct sg_table sg_table;
66 struct scatterlist first_sgl[];
67 };
68
69 enum nvme_rdma_queue_flags {
70 NVME_RDMA_Q_ALLOCATED = 0,
71 NVME_RDMA_Q_LIVE = 1,
72 NVME_RDMA_Q_TR_READY = 2,
73 };
74
75 struct nvme_rdma_queue {
76 struct nvme_rdma_qe *rsp_ring;
77 int queue_size;
78 size_t cmnd_capsule_len;
79 struct nvme_rdma_ctrl *ctrl;
80 struct nvme_rdma_device *device;
81 struct ib_cq *ib_cq;
82 struct ib_qp *qp;
83
84 unsigned long flags;
85 struct rdma_cm_id *cm_id;
86 int cm_error;
87 struct completion cm_done;
88 };
89
90 struct nvme_rdma_ctrl {
91 /* read only in the hot path */
92 struct nvme_rdma_queue *queues;
93
94 /* other member variables */
95 struct blk_mq_tag_set tag_set;
96 struct work_struct err_work;
97
98 struct nvme_rdma_qe async_event_sqe;
99
100 struct delayed_work reconnect_work;
101
102 struct list_head list;
103
104 struct blk_mq_tag_set admin_tag_set;
105 struct nvme_rdma_device *device;
106
107 u32 max_fr_pages;
108
109 struct sockaddr_storage addr;
110 struct sockaddr_storage src_addr;
111
112 struct nvme_ctrl ctrl;
113 bool use_inline_data;
114 u32 io_queues[HCTX_MAX_TYPES];
115 };
116
117 static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)
118 {
119 return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);
120 }
121
122 static LIST_HEAD(device_list);
123 static DEFINE_MUTEX(device_list_mutex);
124
125 static LIST_HEAD(nvme_rdma_ctrl_list);
126 static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);
127
128 /*
129 * Disabling this option makes small I/O goes faster, but is fundamentally
130 * unsafe. With it turned off we will have to register a global rkey that
131 * allows read and write access to all physical memory.
132 */
133 static bool register_always = true;
134 module_param(register_always, bool, 0444);
135 MODULE_PARM_DESC(register_always,
136 "Use memory registration even for contiguous memory regions");
137
138 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
139 struct rdma_cm_event *event);
140 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
141
142 static const struct blk_mq_ops nvme_rdma_mq_ops;
143 static const struct blk_mq_ops nvme_rdma_admin_mq_ops;
144
145 static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
146 {
147 return queue - queue->ctrl->queues;
148 }
149
150 static bool nvme_rdma_poll_queue(struct nvme_rdma_queue *queue)
151 {
152 return nvme_rdma_queue_idx(queue) >
153 queue->ctrl->io_queues[HCTX_TYPE_DEFAULT] +
154 queue->ctrl->io_queues[HCTX_TYPE_READ];
155 }
156
157 static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)
158 {
159 return queue->cmnd_capsule_len - sizeof(struct nvme_command);
160 }
161
162 static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
163 size_t capsule_size, enum dma_data_direction dir)
164 {
165 ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);
166 kfree(qe->data);
167 }
168
169 static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
170 size_t capsule_size, enum dma_data_direction dir)
171 {
172 qe->data = kzalloc(capsule_size, GFP_KERNEL);
173 if (!qe->data)
174 return -ENOMEM;
175
176 qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
177 if (ib_dma_mapping_error(ibdev, qe->dma)) {
178 kfree(qe->data);
179 qe->data = NULL;
180 return -ENOMEM;
181 }
182
183 return 0;
184 }
185
186 static void nvme_rdma_free_ring(struct ib_device *ibdev,
187 struct nvme_rdma_qe *ring, size_t ib_queue_size,
188 size_t capsule_size, enum dma_data_direction dir)
189 {
190 int i;
191
192 for (i = 0; i < ib_queue_size; i++)
193 nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);
194 kfree(ring);
195 }
196
197 static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,
198 size_t ib_queue_size, size_t capsule_size,
199 enum dma_data_direction dir)
200 {
201 struct nvme_rdma_qe *ring;
202 int i;
203
204 ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);
205 if (!ring)
206 return NULL;
207
208 /*
209 * Bind the CQEs (post recv buffers) DMA mapping to the RDMA queue
210 * lifetime. It's safe, since any chage in the underlying RDMA device
211 * will issue error recovery and queue re-creation.
212 */
213 for (i = 0; i < ib_queue_size; i++) {
214 if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))
215 goto out_free_ring;
216 }
217
218 return ring;
219
220 out_free_ring:
221 nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
222 return NULL;
223 }
224
225 static void nvme_rdma_qp_event(struct ib_event *event, void *context)
226 {
227 pr_debug("QP event %s (%d)\n",
228 ib_event_msg(event->event), event->event);
229
230 }
231
232 static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)
233 {
234 int ret;
235
236 ret = wait_for_completion_interruptible_timeout(&queue->cm_done,
237 msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1);
238 if (ret < 0)
239 return ret;
240 if (ret == 0)
241 return -ETIMEDOUT;
242 WARN_ON_ONCE(queue->cm_error > 0);
243 return queue->cm_error;
244 }
245
246 static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor)
247 {
248 struct nvme_rdma_device *dev = queue->device;
249 struct ib_qp_init_attr init_attr;
250 int ret;
251
252 memset(&init_attr, 0, sizeof(init_attr));
253 init_attr.event_handler = nvme_rdma_qp_event;
254 /* +1 for drain */
255 init_attr.cap.max_send_wr = factor * queue->queue_size + 1;
256 /* +1 for drain */
257 init_attr.cap.max_recv_wr = queue->queue_size + 1;
258 init_attr.cap.max_recv_sge = 1;
259 init_attr.cap.max_send_sge = 1 + dev->num_inline_segments;
260 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
261 init_attr.qp_type = IB_QPT_RC;
262 init_attr.send_cq = queue->ib_cq;
263 init_attr.recv_cq = queue->ib_cq;
264
265 ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr);
266
267 queue->qp = queue->cm_id->qp;
268 return ret;
269 }
270
271 static void nvme_rdma_exit_request(struct blk_mq_tag_set *set,
272 struct request *rq, unsigned int hctx_idx)
273 {
274 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
275
276 kfree(req->sqe.data);
277 }
278
279 static int nvme_rdma_init_request(struct blk_mq_tag_set *set,
280 struct request *rq, unsigned int hctx_idx,
281 unsigned int numa_node)
282 {
283 struct nvme_rdma_ctrl *ctrl = set->driver_data;
284 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
285 int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
286 struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
287
288 nvme_req(rq)->ctrl = &ctrl->ctrl;
289 req->sqe.data = kzalloc(sizeof(struct nvme_command), GFP_KERNEL);
290 if (!req->sqe.data)
291 return -ENOMEM;
292
293 req->queue = queue;
294
295 return 0;
296 }
297
298 static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
299 unsigned int hctx_idx)
300 {
301 struct nvme_rdma_ctrl *ctrl = data;
302 struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];
303
304 BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
305
306 hctx->driver_data = queue;
307 return 0;
308 }
309
310 static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
311 unsigned int hctx_idx)
312 {
313 struct nvme_rdma_ctrl *ctrl = data;
314 struct nvme_rdma_queue *queue = &ctrl->queues[0];
315
316 BUG_ON(hctx_idx != 0);
317
318 hctx->driver_data = queue;
319 return 0;
320 }
321
322 static void nvme_rdma_free_dev(struct kref *ref)
323 {
324 struct nvme_rdma_device *ndev =
325 container_of(ref, struct nvme_rdma_device, ref);
326
327 mutex_lock(&device_list_mutex);
328 list_del(&ndev->entry);
329 mutex_unlock(&device_list_mutex);
330
331 ib_dealloc_pd(ndev->pd);
332 kfree(ndev);
333 }
334
335 static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
336 {
337 kref_put(&dev->ref, nvme_rdma_free_dev);
338 }
339
340 static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
341 {
342 return kref_get_unless_zero(&dev->ref);
343 }
344
345 static struct nvme_rdma_device *
346 nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)
347 {
348 struct nvme_rdma_device *ndev;
349
350 mutex_lock(&device_list_mutex);
351 list_for_each_entry(ndev, &device_list, entry) {
352 if (ndev->dev->node_guid == cm_id->device->node_guid &&
353 nvme_rdma_dev_get(ndev))
354 goto out_unlock;
355 }
356
357 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
358 if (!ndev)
359 goto out_err;
360
361 ndev->dev = cm_id->device;
362 kref_init(&ndev->ref);
363
364 ndev->pd = ib_alloc_pd(ndev->dev,
365 register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
366 if (IS_ERR(ndev->pd))
367 goto out_free_dev;
368
369 if (!(ndev->dev->attrs.device_cap_flags &
370 IB_DEVICE_MEM_MGT_EXTENSIONS)) {
371 dev_err(&ndev->dev->dev,
372 "Memory registrations not supported.\n");
373 goto out_free_pd;
374 }
375
376 ndev->num_inline_segments = min(NVME_RDMA_MAX_INLINE_SEGMENTS,
377 ndev->dev->attrs.max_send_sge - 1);
378 list_add(&ndev->entry, &device_list);
379 out_unlock:
380 mutex_unlock(&device_list_mutex);
381 return ndev;
382
383 out_free_pd:
384 ib_dealloc_pd(ndev->pd);
385 out_free_dev:
386 kfree(ndev);
387 out_err:
388 mutex_unlock(&device_list_mutex);
389 return NULL;
390 }
391
392 static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)
393 {
394 struct nvme_rdma_device *dev;
395 struct ib_device *ibdev;
396
397 if (!test_and_clear_bit(NVME_RDMA_Q_TR_READY, &queue->flags))
398 return;
399
400 dev = queue->device;
401 ibdev = dev->dev;
402
403 ib_mr_pool_destroy(queue->qp, &queue->qp->rdma_mrs);
404
405 /*
406 * The cm_id object might have been destroyed during RDMA connection
407 * establishment error flow to avoid getting other cma events, thus
408 * the destruction of the QP shouldn't use rdma_cm API.
409 */
410 ib_destroy_qp(queue->qp);
411 ib_free_cq(queue->ib_cq);
412
413 nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
414 sizeof(struct nvme_completion), DMA_FROM_DEVICE);
415
416 nvme_rdma_dev_put(dev);
417 }
418
419 static int nvme_rdma_get_max_fr_pages(struct ib_device *ibdev)
420 {
421 return min_t(u32, NVME_RDMA_MAX_SEGMENTS,
422 ibdev->attrs.max_fast_reg_page_list_len - 1);
423 }
424
425 static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue)
426 {
427 struct ib_device *ibdev;
428 const int send_wr_factor = 3; /* MR, SEND, INV */
429 const int cq_factor = send_wr_factor + 1; /* + RECV */
430 int comp_vector, idx = nvme_rdma_queue_idx(queue);
431 enum ib_poll_context poll_ctx;
432 int ret, pages_per_mr;
433
434 queue->device = nvme_rdma_find_get_device(queue->cm_id);
435 if (!queue->device) {
436 dev_err(queue->cm_id->device->dev.parent,
437 "no client data found!\n");
438 return -ECONNREFUSED;
439 }
440 ibdev = queue->device->dev;
441
442 /*
443 * Spread I/O queues completion vectors according their queue index.
444 * Admin queues can always go on completion vector 0.
445 */
446 comp_vector = idx == 0 ? idx : idx - 1;
447
448 /* Polling queues need direct cq polling context */
449 if (nvme_rdma_poll_queue(queue))
450 poll_ctx = IB_POLL_DIRECT;
451 else
452 poll_ctx = IB_POLL_SOFTIRQ;
453
454 /* +1 for ib_stop_cq */
455 queue->ib_cq = ib_alloc_cq(ibdev, queue,
456 cq_factor * queue->queue_size + 1,
457 comp_vector, poll_ctx);
458 if (IS_ERR(queue->ib_cq)) {
459 ret = PTR_ERR(queue->ib_cq);
460 goto out_put_dev;
461 }
462
463 ret = nvme_rdma_create_qp(queue, send_wr_factor);
464 if (ret)
465 goto out_destroy_ib_cq;
466
467 queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,
468 sizeof(struct nvme_completion), DMA_FROM_DEVICE);
469 if (!queue->rsp_ring) {
470 ret = -ENOMEM;
471 goto out_destroy_qp;
472 }
473
474 /*
475 * Currently we don't use SG_GAPS MR's so if the first entry is
476 * misaligned we'll end up using two entries for a single data page,
477 * so one additional entry is required.
478 */
479 pages_per_mr = nvme_rdma_get_max_fr_pages(ibdev) + 1;
480 ret = ib_mr_pool_init(queue->qp, &queue->qp->rdma_mrs,
481 queue->queue_size,
482 IB_MR_TYPE_MEM_REG,
483 pages_per_mr, 0);
484 if (ret) {
485 dev_err(queue->ctrl->ctrl.device,
486 "failed to initialize MR pool sized %d for QID %d\n",
487 queue->queue_size, idx);
488 goto out_destroy_ring;
489 }
490
491 set_bit(NVME_RDMA_Q_TR_READY, &queue->flags);
492
493 return 0;
494
495 out_destroy_ring:
496 nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
497 sizeof(struct nvme_completion), DMA_FROM_DEVICE);
498 out_destroy_qp:
499 rdma_destroy_qp(queue->cm_id);
500 out_destroy_ib_cq:
501 ib_free_cq(queue->ib_cq);
502 out_put_dev:
503 nvme_rdma_dev_put(queue->device);
504 return ret;
505 }
506
507 static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
508 int idx, size_t queue_size)
509 {
510 struct nvme_rdma_queue *queue;
511 struct sockaddr *src_addr = NULL;
512 int ret;
513
514 queue = &ctrl->queues[idx];
515 queue->ctrl = ctrl;
516 init_completion(&queue->cm_done);
517
518 if (idx > 0)
519 queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
520 else
521 queue->cmnd_capsule_len = sizeof(struct nvme_command);
522
523 queue->queue_size = queue_size;
524
525 queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,
526 RDMA_PS_TCP, IB_QPT_RC);
527 if (IS_ERR(queue->cm_id)) {
528 dev_info(ctrl->ctrl.device,
529 "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
530 return PTR_ERR(queue->cm_id);
531 }
532
533 if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
534 src_addr = (struct sockaddr *)&ctrl->src_addr;
535
536 queue->cm_error = -ETIMEDOUT;
537 ret = rdma_resolve_addr(queue->cm_id, src_addr,
538 (struct sockaddr *)&ctrl->addr,
539 NVME_RDMA_CONNECT_TIMEOUT_MS);
540 if (ret) {
541 dev_info(ctrl->ctrl.device,
542 "rdma_resolve_addr failed (%d).\n", ret);
543 goto out_destroy_cm_id;
544 }
545
546 ret = nvme_rdma_wait_for_cm(queue);
547 if (ret) {
548 dev_info(ctrl->ctrl.device,
549 "rdma connection establishment failed (%d)\n", ret);
550 goto out_destroy_cm_id;
551 }
552
553 set_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags);
554
555 return 0;
556
557 out_destroy_cm_id:
558 rdma_destroy_id(queue->cm_id);
559 nvme_rdma_destroy_queue_ib(queue);
560 return ret;
561 }
562
563 static void __nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
564 {
565 rdma_disconnect(queue->cm_id);
566 ib_drain_qp(queue->qp);
567 }
568
569 static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
570 {
571 if (!test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
572 return;
573 __nvme_rdma_stop_queue(queue);
574 }
575
576 static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
577 {
578 if (!test_and_clear_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
579 return;
580
581 nvme_rdma_destroy_queue_ib(queue);
582 rdma_destroy_id(queue->cm_id);
583 }
584
585 static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
586 {
587 int i;
588
589 for (i = 1; i < ctrl->ctrl.queue_count; i++)
590 nvme_rdma_free_queue(&ctrl->queues[i]);
591 }
592
593 static void nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl *ctrl)
594 {
595 int i;
596
597 for (i = 1; i < ctrl->ctrl.queue_count; i++)
598 nvme_rdma_stop_queue(&ctrl->queues[i]);
599 }
600
601 static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx)
602 {
603 struct nvme_rdma_queue *queue = &ctrl->queues[idx];
604 bool poll = nvme_rdma_poll_queue(queue);
605 int ret;
606
607 if (idx)
608 ret = nvmf_connect_io_queue(&ctrl->ctrl, idx, poll);
609 else
610 ret = nvmf_connect_admin_queue(&ctrl->ctrl);
611
612 if (!ret) {
613 set_bit(NVME_RDMA_Q_LIVE, &queue->flags);
614 } else {
615 if (test_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
616 __nvme_rdma_stop_queue(queue);
617 dev_info(ctrl->ctrl.device,
618 "failed to connect queue: %d ret=%d\n", idx, ret);
619 }
620 return ret;
621 }
622
623 static int nvme_rdma_start_io_queues(struct nvme_rdma_ctrl *ctrl)
624 {
625 int i, ret = 0;
626
627 for (i = 1; i < ctrl->ctrl.queue_count; i++) {
628 ret = nvme_rdma_start_queue(ctrl, i);
629 if (ret)
630 goto out_stop_queues;
631 }
632
633 return 0;
634
635 out_stop_queues:
636 for (i--; i >= 1; i--)
637 nvme_rdma_stop_queue(&ctrl->queues[i]);
638 return ret;
639 }
640
641 static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl)
642 {
643 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
644 struct ib_device *ibdev = ctrl->device->dev;
645 unsigned int nr_io_queues, nr_default_queues;
646 unsigned int nr_read_queues, nr_poll_queues;
647 int i, ret;
648
649 nr_read_queues = min_t(unsigned int, ibdev->num_comp_vectors,
650 min(opts->nr_io_queues, num_online_cpus()));
651 nr_default_queues = min_t(unsigned int, ibdev->num_comp_vectors,
652 min(opts->nr_write_queues, num_online_cpus()));
653 nr_poll_queues = min(opts->nr_poll_queues, num_online_cpus());
654 nr_io_queues = nr_read_queues + nr_default_queues + nr_poll_queues;
655
656 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
657 if (ret)
658 return ret;
659
660 ctrl->ctrl.queue_count = nr_io_queues + 1;
661 if (ctrl->ctrl.queue_count < 2)
662 return 0;
663
664 dev_info(ctrl->ctrl.device,
665 "creating %d I/O queues.\n", nr_io_queues);
666
667 if (opts->nr_write_queues && nr_read_queues < nr_io_queues) {
668 /*
669 * separate read/write queues
670 * hand out dedicated default queues only after we have
671 * sufficient read queues.
672 */
673 ctrl->io_queues[HCTX_TYPE_READ] = nr_read_queues;
674 nr_io_queues -= ctrl->io_queues[HCTX_TYPE_READ];
675 ctrl->io_queues[HCTX_TYPE_DEFAULT] =
676 min(nr_default_queues, nr_io_queues);
677 nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
678 } else {
679 /*
680 * shared read/write queues
681 * either no write queues were requested, or we don't have
682 * sufficient queue count to have dedicated default queues.
683 */
684 ctrl->io_queues[HCTX_TYPE_DEFAULT] =
685 min(nr_read_queues, nr_io_queues);
686 nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
687 }
688
689 if (opts->nr_poll_queues && nr_io_queues) {
690 /* map dedicated poll queues only if we have queues left */
691 ctrl->io_queues[HCTX_TYPE_POLL] =
692 min(nr_poll_queues, nr_io_queues);
693 }
694
695 for (i = 1; i < ctrl->ctrl.queue_count; i++) {
696 ret = nvme_rdma_alloc_queue(ctrl, i,
697 ctrl->ctrl.sqsize + 1);
698 if (ret)
699 goto out_free_queues;
700 }
701
702 return 0;
703
704 out_free_queues:
705 for (i--; i >= 1; i--)
706 nvme_rdma_free_queue(&ctrl->queues[i]);
707
708 return ret;
709 }
710
711 static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl,
712 bool admin)
713 {
714 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
715 struct blk_mq_tag_set *set;
716 int ret;
717
718 if (admin) {
719 set = &ctrl->admin_tag_set;
720 memset(set, 0, sizeof(*set));
721 set->ops = &nvme_rdma_admin_mq_ops;
722 set->queue_depth = NVME_AQ_MQ_TAG_DEPTH;
723 set->reserved_tags = 2; /* connect + keep-alive */
724 set->numa_node = nctrl->numa_node;
725 set->cmd_size = sizeof(struct nvme_rdma_request) +
726 NVME_INLINE_SG_CNT * sizeof(struct scatterlist);
727 set->driver_data = ctrl;
728 set->nr_hw_queues = 1;
729 set->timeout = ADMIN_TIMEOUT;
730 set->flags = BLK_MQ_F_NO_SCHED;
731 } else {
732 set = &ctrl->tag_set;
733 memset(set, 0, sizeof(*set));
734 set->ops = &nvme_rdma_mq_ops;
735 set->queue_depth = nctrl->sqsize + 1;
736 set->reserved_tags = 1; /* fabric connect */
737 set->numa_node = nctrl->numa_node;
738 set->flags = BLK_MQ_F_SHOULD_MERGE;
739 set->cmd_size = sizeof(struct nvme_rdma_request) +
740 NVME_INLINE_SG_CNT * sizeof(struct scatterlist);
741 set->driver_data = ctrl;
742 set->nr_hw_queues = nctrl->queue_count - 1;
743 set->timeout = NVME_IO_TIMEOUT;
744 set->nr_maps = nctrl->opts->nr_poll_queues ? HCTX_MAX_TYPES : 2;
745 }
746
747 ret = blk_mq_alloc_tag_set(set);
748 if (ret)
749 return ERR_PTR(ret);
750
751 return set;
752 }
753
754 static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
755 bool remove)
756 {
757 if (remove) {
758 blk_cleanup_queue(ctrl->ctrl.admin_q);
759 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
760 blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
761 }
762 if (ctrl->async_event_sqe.data) {
763 nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
764 sizeof(struct nvme_command), DMA_TO_DEVICE);
765 ctrl->async_event_sqe.data = NULL;
766 }
767 nvme_rdma_free_queue(&ctrl->queues[0]);
768 }
769
770 static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
771 bool new)
772 {
773 int error;
774
775 error = nvme_rdma_alloc_queue(ctrl, 0, NVME_AQ_DEPTH);
776 if (error)
777 return error;
778
779 ctrl->device = ctrl->queues[0].device;
780 ctrl->ctrl.numa_node = dev_to_node(ctrl->device->dev->dma_device);
781
782 ctrl->max_fr_pages = nvme_rdma_get_max_fr_pages(ctrl->device->dev);
783
784 /*
785 * Bind the async event SQE DMA mapping to the admin queue lifetime.
786 * It's safe, since any chage in the underlying RDMA device will issue
787 * error recovery and queue re-creation.
788 */
789 error = nvme_rdma_alloc_qe(ctrl->device->dev, &ctrl->async_event_sqe,
790 sizeof(struct nvme_command), DMA_TO_DEVICE);
791 if (error)
792 goto out_free_queue;
793
794 if (new) {
795 ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true);
796 if (IS_ERR(ctrl->ctrl.admin_tagset)) {
797 error = PTR_ERR(ctrl->ctrl.admin_tagset);
798 goto out_free_async_qe;
799 }
800
801 ctrl->ctrl.fabrics_q = blk_mq_init_queue(&ctrl->admin_tag_set);
802 if (IS_ERR(ctrl->ctrl.fabrics_q)) {
803 error = PTR_ERR(ctrl->ctrl.fabrics_q);
804 goto out_free_tagset;
805 }
806
807 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
808 if (IS_ERR(ctrl->ctrl.admin_q)) {
809 error = PTR_ERR(ctrl->ctrl.admin_q);
810 goto out_cleanup_fabrics_q;
811 }
812 }
813
814 error = nvme_rdma_start_queue(ctrl, 0);
815 if (error)
816 goto out_cleanup_queue;
817
818 error = nvme_enable_ctrl(&ctrl->ctrl);
819 if (error)
820 goto out_stop_queue;
821
822 ctrl->ctrl.max_segments = ctrl->max_fr_pages;
823 ctrl->ctrl.max_hw_sectors = ctrl->max_fr_pages << (ilog2(SZ_4K) - 9);
824
825 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
826
827 error = nvme_init_identify(&ctrl->ctrl);
828 if (error)
829 goto out_stop_queue;
830
831 return 0;
832
833 out_stop_queue:
834 nvme_rdma_stop_queue(&ctrl->queues[0]);
835 out_cleanup_queue:
836 if (new)
837 blk_cleanup_queue(ctrl->ctrl.admin_q);
838 out_cleanup_fabrics_q:
839 if (new)
840 blk_cleanup_queue(ctrl->ctrl.fabrics_q);
841 out_free_tagset:
842 if (new)
843 blk_mq_free_tag_set(ctrl->ctrl.admin_tagset);
844 out_free_async_qe:
845 if (ctrl->async_event_sqe.data) {
846 nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
847 sizeof(struct nvme_command), DMA_TO_DEVICE);
848 ctrl->async_event_sqe.data = NULL;
849 }
850 out_free_queue:
851 nvme_rdma_free_queue(&ctrl->queues[0]);
852 return error;
853 }
854
855 static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl,
856 bool remove)
857 {
858 if (remove) {
859 blk_cleanup_queue(ctrl->ctrl.connect_q);
860 blk_mq_free_tag_set(ctrl->ctrl.tagset);
861 }
862 nvme_rdma_free_io_queues(ctrl);
863 }
864
865 static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
866 {
867 int ret;
868
869 ret = nvme_rdma_alloc_io_queues(ctrl);
870 if (ret)
871 return ret;
872
873 if (new) {
874 ctrl->ctrl.tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, false);
875 if (IS_ERR(ctrl->ctrl.tagset)) {
876 ret = PTR_ERR(ctrl->ctrl.tagset);
877 goto out_free_io_queues;
878 }
879
880 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
881 if (IS_ERR(ctrl->ctrl.connect_q)) {
882 ret = PTR_ERR(ctrl->ctrl.connect_q);
883 goto out_free_tag_set;
884 }
885 } else {
886 blk_mq_update_nr_hw_queues(&ctrl->tag_set,
887 ctrl->ctrl.queue_count - 1);
888 }
889
890 ret = nvme_rdma_start_io_queues(ctrl);
891 if (ret)
892 goto out_cleanup_connect_q;
893
894 return 0;
895
896 out_cleanup_connect_q:
897 if (new)
898 blk_cleanup_queue(ctrl->ctrl.connect_q);
899 out_free_tag_set:
900 if (new)
901 blk_mq_free_tag_set(ctrl->ctrl.tagset);
902 out_free_io_queues:
903 nvme_rdma_free_io_queues(ctrl);
904 return ret;
905 }
906
907 static void nvme_rdma_teardown_admin_queue(struct nvme_rdma_ctrl *ctrl,
908 bool remove)
909 {
910 blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
911 nvme_rdma_stop_queue(&ctrl->queues[0]);
912 if (ctrl->ctrl.admin_tagset) {
913 blk_mq_tagset_busy_iter(ctrl->ctrl.admin_tagset,
914 nvme_cancel_request, &ctrl->ctrl);
915 blk_mq_tagset_wait_completed_request(ctrl->ctrl.admin_tagset);
916 }
917 if (remove)
918 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
919 nvme_rdma_destroy_admin_queue(ctrl, remove);
920 }
921
922 static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl,
923 bool remove)
924 {
925 if (ctrl->ctrl.queue_count > 1) {
926 nvme_stop_queues(&ctrl->ctrl);
927 nvme_rdma_stop_io_queues(ctrl);
928 if (ctrl->ctrl.tagset) {
929 blk_mq_tagset_busy_iter(ctrl->ctrl.tagset,
930 nvme_cancel_request, &ctrl->ctrl);
931 blk_mq_tagset_wait_completed_request(ctrl->ctrl.tagset);
932 }
933 if (remove)
934 nvme_start_queues(&ctrl->ctrl);
935 nvme_rdma_destroy_io_queues(ctrl, remove);
936 }
937 }
938
939 static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
940 {
941 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
942
943 if (list_empty(&ctrl->list))
944 goto free_ctrl;
945
946 mutex_lock(&nvme_rdma_ctrl_mutex);
947 list_del(&ctrl->list);
948 mutex_unlock(&nvme_rdma_ctrl_mutex);
949
950 nvmf_free_options(nctrl->opts);
951 free_ctrl:
952 kfree(ctrl->queues);
953 kfree(ctrl);
954 }
955
956 static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl)
957 {
958 /* If we are resetting/deleting then do nothing */
959 if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) {
960 WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
961 ctrl->ctrl.state == NVME_CTRL_LIVE);
962 return;
963 }
964
965 if (nvmf_should_reconnect(&ctrl->ctrl)) {
966 dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n",
967 ctrl->ctrl.opts->reconnect_delay);
968 queue_delayed_work(nvme_wq, &ctrl->reconnect_work,
969 ctrl->ctrl.opts->reconnect_delay * HZ);
970 } else {
971 nvme_delete_ctrl(&ctrl->ctrl);
972 }
973 }
974
975 static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)
976 {
977 int ret = -EINVAL;
978 bool changed;
979
980 ret = nvme_rdma_configure_admin_queue(ctrl, new);
981 if (ret)
982 return ret;
983
984 if (ctrl->ctrl.icdoff) {
985 dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
986 goto destroy_admin;
987 }
988
989 if (!(ctrl->ctrl.sgls & (1 << 2))) {
990 dev_err(ctrl->ctrl.device,
991 "Mandatory keyed sgls are not supported!\n");
992 goto destroy_admin;
993 }
994
995 if (ctrl->ctrl.opts->queue_size > ctrl->ctrl.sqsize + 1) {
996 dev_warn(ctrl->ctrl.device,
997 "queue_size %zu > ctrl sqsize %u, clamping down\n",
998 ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1);
999 }
1000
1001 if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) {
1002 dev_warn(ctrl->ctrl.device,
1003 "sqsize %u > ctrl maxcmd %u, clamping down\n",
1004 ctrl->ctrl.sqsize + 1, ctrl->ctrl.maxcmd);
1005 ctrl->ctrl.sqsize = ctrl->ctrl.maxcmd - 1;
1006 }
1007
1008 if (ctrl->ctrl.sgls & (1 << 20))
1009 ctrl->use_inline_data = true;
1010
1011 if (ctrl->ctrl.queue_count > 1) {
1012 ret = nvme_rdma_configure_io_queues(ctrl, new);
1013 if (ret)
1014 goto destroy_admin;
1015 }
1016
1017 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
1018 if (!changed) {
1019 /*
1020 * state change failure is ok if we're in DELETING state,
1021 * unless we're during creation of a new controller to
1022 * avoid races with teardown flow.
1023 */
1024 WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING);
1025 WARN_ON_ONCE(new);
1026 ret = -EINVAL;
1027 goto destroy_io;
1028 }
1029
1030 nvme_start_ctrl(&ctrl->ctrl);
1031 return 0;
1032
1033 destroy_io:
1034 if (ctrl->ctrl.queue_count > 1)
1035 nvme_rdma_destroy_io_queues(ctrl, new);
1036 destroy_admin:
1037 nvme_rdma_stop_queue(&ctrl->queues[0]);
1038 nvme_rdma_destroy_admin_queue(ctrl, new);
1039 return ret;
1040 }
1041
1042 static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)
1043 {
1044 struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),
1045 struct nvme_rdma_ctrl, reconnect_work);
1046
1047 ++ctrl->ctrl.nr_reconnects;
1048
1049 if (nvme_rdma_setup_ctrl(ctrl, false))
1050 goto requeue;
1051
1052 dev_info(ctrl->ctrl.device, "Successfully reconnected (%d attempts)\n",
1053 ctrl->ctrl.nr_reconnects);
1054
1055 ctrl->ctrl.nr_reconnects = 0;
1056
1057 return;
1058
1059 requeue:
1060 dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n",
1061 ctrl->ctrl.nr_reconnects);
1062 nvme_rdma_reconnect_or_remove(ctrl);
1063 }
1064
1065 static void nvme_rdma_error_recovery_work(struct work_struct *work)
1066 {
1067 struct nvme_rdma_ctrl *ctrl = container_of(work,
1068 struct nvme_rdma_ctrl, err_work);
1069
1070 nvme_stop_keep_alive(&ctrl->ctrl);
1071 nvme_rdma_teardown_io_queues(ctrl, false);
1072 nvme_start_queues(&ctrl->ctrl);
1073 nvme_rdma_teardown_admin_queue(ctrl, false);
1074 blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
1075
1076 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
1077 /* state change failure is ok if we're in DELETING state */
1078 WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING);
1079 return;
1080 }
1081
1082 nvme_rdma_reconnect_or_remove(ctrl);
1083 }
1084
1085 static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
1086 {
1087 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
1088 return;
1089
1090 queue_work(nvme_reset_wq, &ctrl->err_work);
1091 }
1092
1093 static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,
1094 const char *op)
1095 {
1096 struct nvme_rdma_queue *queue = cq->cq_context;
1097 struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1098
1099 if (ctrl->ctrl.state == NVME_CTRL_LIVE)
1100 dev_info(ctrl->ctrl.device,
1101 "%s for CQE 0x%p failed with status %s (%d)\n",
1102 op, wc->wr_cqe,
1103 ib_wc_status_msg(wc->status), wc->status);
1104 nvme_rdma_error_recovery(ctrl);
1105 }
1106
1107 static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
1108 {
1109 if (unlikely(wc->status != IB_WC_SUCCESS))
1110 nvme_rdma_wr_error(cq, wc, "MEMREG");
1111 }
1112
1113 static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
1114 {
1115 struct nvme_rdma_request *req =
1116 container_of(wc->wr_cqe, struct nvme_rdma_request, reg_cqe);
1117 struct request *rq = blk_mq_rq_from_pdu(req);
1118
1119 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1120 nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
1121 return;
1122 }
1123
1124 if (refcount_dec_and_test(&req->ref))
1125 nvme_end_request(rq, req->status, req->result);
1126
1127 }
1128
1129 static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
1130 struct nvme_rdma_request *req)
1131 {
1132 struct ib_send_wr wr = {
1133 .opcode = IB_WR_LOCAL_INV,
1134 .next = NULL,
1135 .num_sge = 0,
1136 .send_flags = IB_SEND_SIGNALED,
1137 .ex.invalidate_rkey = req->mr->rkey,
1138 };
1139
1140 req->reg_cqe.done = nvme_rdma_inv_rkey_done;
1141 wr.wr_cqe = &req->reg_cqe;
1142
1143 return ib_post_send(queue->qp, &wr, NULL);
1144 }
1145
1146 static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
1147 struct request *rq)
1148 {
1149 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1150 struct nvme_rdma_device *dev = queue->device;
1151 struct ib_device *ibdev = dev->dev;
1152
1153 if (!blk_rq_nr_phys_segments(rq))
1154 return;
1155
1156 if (req->mr) {
1157 ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);
1158 req->mr = NULL;
1159 }
1160
1161 ib_dma_unmap_sg(ibdev, req->sg_table.sgl, req->nents, rq_dma_dir(rq));
1162 sg_free_table_chained(&req->sg_table, NVME_INLINE_SG_CNT);
1163 }
1164
1165 static int nvme_rdma_set_sg_null(struct nvme_command *c)
1166 {
1167 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1168
1169 sg->addr = 0;
1170 put_unaligned_le24(0, sg->length);
1171 put_unaligned_le32(0, sg->key);
1172 sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1173 return 0;
1174 }
1175
1176 static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
1177 struct nvme_rdma_request *req, struct nvme_command *c,
1178 int count)
1179 {
1180 struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
1181 struct scatterlist *sgl = req->sg_table.sgl;
1182 struct ib_sge *sge = &req->sge[1];
1183 u32 len = 0;
1184 int i;
1185
1186 for (i = 0; i < count; i++, sgl++, sge++) {
1187 sge->addr = sg_dma_address(sgl);
1188 sge->length = sg_dma_len(sgl);
1189 sge->lkey = queue->device->pd->local_dma_lkey;
1190 len += sge->length;
1191 }
1192
1193 sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
1194 sg->length = cpu_to_le32(len);
1195 sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
1196
1197 req->num_sge += count;
1198 return 0;
1199 }
1200
1201 static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,
1202 struct nvme_rdma_request *req, struct nvme_command *c)
1203 {
1204 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1205
1206 sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl));
1207 put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length);
1208 put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
1209 sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
1210 return 0;
1211 }
1212
1213 static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
1214 struct nvme_rdma_request *req, struct nvme_command *c,
1215 int count)
1216 {
1217 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
1218 int nr;
1219
1220 req->mr = ib_mr_pool_get(queue->qp, &queue->qp->rdma_mrs);
1221 if (WARN_ON_ONCE(!req->mr))
1222 return -EAGAIN;
1223
1224 /*
1225 * Align the MR to a 4K page size to match the ctrl page size and
1226 * the block virtual boundary.
1227 */
1228 nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, SZ_4K);
1229 if (unlikely(nr < count)) {
1230 ib_mr_pool_put(queue->qp, &queue->qp->rdma_mrs, req->mr);
1231 req->mr = NULL;
1232 if (nr < 0)
1233 return nr;
1234 return -EINVAL;
1235 }
1236
1237 ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
1238
1239 req->reg_cqe.done = nvme_rdma_memreg_done;
1240 memset(&req->reg_wr, 0, sizeof(req->reg_wr));
1241 req->reg_wr.wr.opcode = IB_WR_REG_MR;
1242 req->reg_wr.wr.wr_cqe = &req->reg_cqe;
1243 req->reg_wr.wr.num_sge = 0;
1244 req->reg_wr.mr = req->mr;
1245 req->reg_wr.key = req->mr->rkey;
1246 req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |
1247 IB_ACCESS_REMOTE_READ |
1248 IB_ACCESS_REMOTE_WRITE;
1249
1250 sg->addr = cpu_to_le64(req->mr->iova);
1251 put_unaligned_le24(req->mr->length, sg->length);
1252 put_unaligned_le32(req->mr->rkey, sg->key);
1253 sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |
1254 NVME_SGL_FMT_INVALIDATE;
1255
1256 return 0;
1257 }
1258
1259 static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
1260 struct request *rq, struct nvme_command *c)
1261 {
1262 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1263 struct nvme_rdma_device *dev = queue->device;
1264 struct ib_device *ibdev = dev->dev;
1265 int count, ret;
1266
1267 req->num_sge = 1;
1268 refcount_set(&req->ref, 2); /* send and recv completions */
1269
1270 c->common.flags |= NVME_CMD_SGL_METABUF;
1271
1272 if (!blk_rq_nr_phys_segments(rq))
1273 return nvme_rdma_set_sg_null(c);
1274
1275 req->sg_table.sgl = req->first_sgl;
1276 ret = sg_alloc_table_chained(&req->sg_table,
1277 blk_rq_nr_phys_segments(rq), req->sg_table.sgl,
1278 NVME_INLINE_SG_CNT);
1279 if (ret)
1280 return -ENOMEM;
1281
1282 req->nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl);
1283
1284 count = ib_dma_map_sg(ibdev, req->sg_table.sgl, req->nents,
1285 rq_dma_dir(rq));
1286 if (unlikely(count <= 0)) {
1287 ret = -EIO;
1288 goto out_free_table;
1289 }
1290
1291 if (count <= dev->num_inline_segments) {
1292 if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&
1293 queue->ctrl->use_inline_data &&
1294 blk_rq_payload_bytes(rq) <=
1295 nvme_rdma_inline_data_size(queue)) {
1296 ret = nvme_rdma_map_sg_inline(queue, req, c, count);
1297 goto out;
1298 }
1299
1300 if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
1301 ret = nvme_rdma_map_sg_single(queue, req, c);
1302 goto out;
1303 }
1304 }
1305
1306 ret = nvme_rdma_map_sg_fr(queue, req, c, count);
1307 out:
1308 if (unlikely(ret))
1309 goto out_unmap_sg;
1310
1311 return 0;
1312
1313 out_unmap_sg:
1314 ib_dma_unmap_sg(ibdev, req->sg_table.sgl, req->nents, rq_dma_dir(rq));
1315 out_free_table:
1316 sg_free_table_chained(&req->sg_table, NVME_INLINE_SG_CNT);
1317 return ret;
1318 }
1319
1320 static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
1321 {
1322 struct nvme_rdma_qe *qe =
1323 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1324 struct nvme_rdma_request *req =
1325 container_of(qe, struct nvme_rdma_request, sqe);
1326 struct request *rq = blk_mq_rq_from_pdu(req);
1327
1328 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1329 nvme_rdma_wr_error(cq, wc, "SEND");
1330 return;
1331 }
1332
1333 if (refcount_dec_and_test(&req->ref))
1334 nvme_end_request(rq, req->status, req->result);
1335 }
1336
1337 static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
1338 struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
1339 struct ib_send_wr *first)
1340 {
1341 struct ib_send_wr wr;
1342 int ret;
1343
1344 sge->addr = qe->dma;
1345 sge->length = sizeof(struct nvme_command);
1346 sge->lkey = queue->device->pd->local_dma_lkey;
1347
1348 wr.next = NULL;
1349 wr.wr_cqe = &qe->cqe;
1350 wr.sg_list = sge;
1351 wr.num_sge = num_sge;
1352 wr.opcode = IB_WR_SEND;
1353 wr.send_flags = IB_SEND_SIGNALED;
1354
1355 if (first)
1356 first->next = &wr;
1357 else
1358 first = &wr;
1359
1360 ret = ib_post_send(queue->qp, first, NULL);
1361 if (unlikely(ret)) {
1362 dev_err(queue->ctrl->ctrl.device,
1363 "%s failed with error code %d\n", __func__, ret);
1364 }
1365 return ret;
1366 }
1367
1368 static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
1369 struct nvme_rdma_qe *qe)
1370 {
1371 struct ib_recv_wr wr;
1372 struct ib_sge list;
1373 int ret;
1374
1375 list.addr = qe->dma;
1376 list.length = sizeof(struct nvme_completion);
1377 list.lkey = queue->device->pd->local_dma_lkey;
1378
1379 qe->cqe.done = nvme_rdma_recv_done;
1380
1381 wr.next = NULL;
1382 wr.wr_cqe = &qe->cqe;
1383 wr.sg_list = &list;
1384 wr.num_sge = 1;
1385
1386 ret = ib_post_recv(queue->qp, &wr, NULL);
1387 if (unlikely(ret)) {
1388 dev_err(queue->ctrl->ctrl.device,
1389 "%s failed with error code %d\n", __func__, ret);
1390 }
1391 return ret;
1392 }
1393
1394 static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
1395 {
1396 u32 queue_idx = nvme_rdma_queue_idx(queue);
1397
1398 if (queue_idx == 0)
1399 return queue->ctrl->admin_tag_set.tags[queue_idx];
1400 return queue->ctrl->tag_set.tags[queue_idx - 1];
1401 }
1402
1403 static void nvme_rdma_async_done(struct ib_cq *cq, struct ib_wc *wc)
1404 {
1405 if (unlikely(wc->status != IB_WC_SUCCESS))
1406 nvme_rdma_wr_error(cq, wc, "ASYNC");
1407 }
1408
1409 static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg)
1410 {
1411 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
1412 struct nvme_rdma_queue *queue = &ctrl->queues[0];
1413 struct ib_device *dev = queue->device->dev;
1414 struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
1415 struct nvme_command *cmd = sqe->data;
1416 struct ib_sge sge;
1417 int ret;
1418
1419 ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);
1420
1421 memset(cmd, 0, sizeof(*cmd));
1422 cmd->common.opcode = nvme_admin_async_event;
1423 cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH;
1424 cmd->common.flags |= NVME_CMD_SGL_METABUF;
1425 nvme_rdma_set_sg_null(cmd);
1426
1427 sqe->cqe.done = nvme_rdma_async_done;
1428
1429 ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
1430 DMA_TO_DEVICE);
1431
1432 ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL);
1433 WARN_ON_ONCE(ret);
1434 }
1435
1436 static void nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
1437 struct nvme_completion *cqe, struct ib_wc *wc)
1438 {
1439 struct request *rq;
1440 struct nvme_rdma_request *req;
1441
1442 rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id);
1443 if (!rq) {
1444 dev_err(queue->ctrl->ctrl.device,
1445 "tag 0x%x on QP %#x not found\n",
1446 cqe->command_id, queue->qp->qp_num);
1447 nvme_rdma_error_recovery(queue->ctrl);
1448 return;
1449 }
1450 req = blk_mq_rq_to_pdu(rq);
1451
1452 req->status = cqe->status;
1453 req->result = cqe->result;
1454
1455 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
1456 if (unlikely(wc->ex.invalidate_rkey != req->mr->rkey)) {
1457 dev_err(queue->ctrl->ctrl.device,
1458 "Bogus remote invalidation for rkey %#x\n",
1459 req->mr->rkey);
1460 nvme_rdma_error_recovery(queue->ctrl);
1461 }
1462 } else if (req->mr) {
1463 int ret;
1464
1465 ret = nvme_rdma_inv_rkey(queue, req);
1466 if (unlikely(ret < 0)) {
1467 dev_err(queue->ctrl->ctrl.device,
1468 "Queueing INV WR for rkey %#x failed (%d)\n",
1469 req->mr->rkey, ret);
1470 nvme_rdma_error_recovery(queue->ctrl);
1471 }
1472 /* the local invalidation completion will end the request */
1473 return;
1474 }
1475
1476 if (refcount_dec_and_test(&req->ref))
1477 nvme_end_request(rq, req->status, req->result);
1478 }
1479
1480 static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1481 {
1482 struct nvme_rdma_qe *qe =
1483 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1484 struct nvme_rdma_queue *queue = cq->cq_context;
1485 struct ib_device *ibdev = queue->device->dev;
1486 struct nvme_completion *cqe = qe->data;
1487 const size_t len = sizeof(struct nvme_completion);
1488
1489 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1490 nvme_rdma_wr_error(cq, wc, "RECV");
1491 return;
1492 }
1493
1494 ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1495 /*
1496 * AEN requests are special as they don't time out and can
1497 * survive any kind of queue freeze and often don't respond to
1498 * aborts. We don't even bother to allocate a struct request
1499 * for them but rather special case them here.
1500 */
1501 if (unlikely(nvme_is_aen_req(nvme_rdma_queue_idx(queue),
1502 cqe->command_id)))
1503 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
1504 &cqe->result);
1505 else
1506 nvme_rdma_process_nvme_rsp(queue, cqe, wc);
1507 ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1508
1509 nvme_rdma_post_recv(queue, qe);
1510 }
1511
1512 static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
1513 {
1514 int ret, i;
1515
1516 for (i = 0; i < queue->queue_size; i++) {
1517 ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
1518 if (ret)
1519 goto out_destroy_queue_ib;
1520 }
1521
1522 return 0;
1523
1524 out_destroy_queue_ib:
1525 nvme_rdma_destroy_queue_ib(queue);
1526 return ret;
1527 }
1528
1529 static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
1530 struct rdma_cm_event *ev)
1531 {
1532 struct rdma_cm_id *cm_id = queue->cm_id;
1533 int status = ev->status;
1534 const char *rej_msg;
1535 const struct nvme_rdma_cm_rej *rej_data;
1536 u8 rej_data_len;
1537
1538 rej_msg = rdma_reject_msg(cm_id, status);
1539 rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);
1540
1541 if (rej_data && rej_data_len >= sizeof(u16)) {
1542 u16 sts = le16_to_cpu(rej_data->sts);
1543
1544 dev_err(queue->ctrl->ctrl.device,
1545 "Connect rejected: status %d (%s) nvme status %d (%s).\n",
1546 status, rej_msg, sts, nvme_rdma_cm_msg(sts));
1547 } else {
1548 dev_err(queue->ctrl->ctrl.device,
1549 "Connect rejected: status %d (%s).\n", status, rej_msg);
1550 }
1551
1552 return -ECONNRESET;
1553 }
1554
1555 static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
1556 {
1557 struct nvme_ctrl *ctrl = &queue->ctrl->ctrl;
1558 int ret;
1559
1560 ret = nvme_rdma_create_queue_ib(queue);
1561 if (ret)
1562 return ret;
1563
1564 if (ctrl->opts->tos >= 0)
1565 rdma_set_service_type(queue->cm_id, ctrl->opts->tos);
1566 ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS);
1567 if (ret) {
1568 dev_err(ctrl->device, "rdma_resolve_route failed (%d).\n",
1569 queue->cm_error);
1570 goto out_destroy_queue;
1571 }
1572
1573 return 0;
1574
1575 out_destroy_queue:
1576 nvme_rdma_destroy_queue_ib(queue);
1577 return ret;
1578 }
1579
1580 static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
1581 {
1582 struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1583 struct rdma_conn_param param = { };
1584 struct nvme_rdma_cm_req priv = { };
1585 int ret;
1586
1587 param.qp_num = queue->qp->qp_num;
1588 param.flow_control = 1;
1589
1590 param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
1591 /* maximum retry count */
1592 param.retry_count = 7;
1593 param.rnr_retry_count = 7;
1594 param.private_data = &priv;
1595 param.private_data_len = sizeof(priv);
1596
1597 priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1598 priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
1599 /*
1600 * set the admin queue depth to the minimum size
1601 * specified by the Fabrics standard.
1602 */
1603 if (priv.qid == 0) {
1604 priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH);
1605 priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
1606 } else {
1607 /*
1608 * current interpretation of the fabrics spec
1609 * is at minimum you make hrqsize sqsize+1, or a
1610 * 1's based representation of sqsize.
1611 */
1612 priv.hrqsize = cpu_to_le16(queue->queue_size);
1613 priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
1614 }
1615
1616 ret = rdma_connect(queue->cm_id, &param);
1617 if (ret) {
1618 dev_err(ctrl->ctrl.device,
1619 "rdma_connect failed (%d).\n", ret);
1620 goto out_destroy_queue_ib;
1621 }
1622
1623 return 0;
1624
1625 out_destroy_queue_ib:
1626 nvme_rdma_destroy_queue_ib(queue);
1627 return ret;
1628 }
1629
1630 static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
1631 struct rdma_cm_event *ev)
1632 {
1633 struct nvme_rdma_queue *queue = cm_id->context;
1634 int cm_error = 0;
1635
1636 dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
1637 rdma_event_msg(ev->event), ev->event,
1638 ev->status, cm_id);
1639
1640 switch (ev->event) {
1641 case RDMA_CM_EVENT_ADDR_RESOLVED:
1642 cm_error = nvme_rdma_addr_resolved(queue);
1643 break;
1644 case RDMA_CM_EVENT_ROUTE_RESOLVED:
1645 cm_error = nvme_rdma_route_resolved(queue);
1646 break;
1647 case RDMA_CM_EVENT_ESTABLISHED:
1648 queue->cm_error = nvme_rdma_conn_established(queue);
1649 /* complete cm_done regardless of success/failure */
1650 complete(&queue->cm_done);
1651 return 0;
1652 case RDMA_CM_EVENT_REJECTED:
1653 nvme_rdma_destroy_queue_ib(queue);
1654 cm_error = nvme_rdma_conn_rejected(queue, ev);
1655 break;
1656 case RDMA_CM_EVENT_ROUTE_ERROR:
1657 case RDMA_CM_EVENT_CONNECT_ERROR:
1658 case RDMA_CM_EVENT_UNREACHABLE:
1659 nvme_rdma_destroy_queue_ib(queue);
1660 /* fall through */
1661 case RDMA_CM_EVENT_ADDR_ERROR:
1662 dev_dbg(queue->ctrl->ctrl.device,
1663 "CM error event %d\n", ev->event);
1664 cm_error = -ECONNRESET;
1665 break;
1666 case RDMA_CM_EVENT_DISCONNECTED:
1667 case RDMA_CM_EVENT_ADDR_CHANGE:
1668 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1669 dev_dbg(queue->ctrl->ctrl.device,
1670 "disconnect received - connection closed\n");
1671 nvme_rdma_error_recovery(queue->ctrl);
1672 break;
1673 case RDMA_CM_EVENT_DEVICE_REMOVAL:
1674 /* device removal is handled via the ib_client API */
1675 break;
1676 default:
1677 dev_err(queue->ctrl->ctrl.device,
1678 "Unexpected RDMA CM event (%d)\n", ev->event);
1679 nvme_rdma_error_recovery(queue->ctrl);
1680 break;
1681 }
1682
1683 if (cm_error) {
1684 queue->cm_error = cm_error;
1685 complete(&queue->cm_done);
1686 }
1687
1688 return 0;
1689 }
1690
1691 static enum blk_eh_timer_return
1692 nvme_rdma_timeout(struct request *rq, bool reserved)
1693 {
1694 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1695 struct nvme_rdma_queue *queue = req->queue;
1696 struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1697
1698 dev_warn(ctrl->ctrl.device, "I/O %d QID %d timeout\n",
1699 rq->tag, nvme_rdma_queue_idx(queue));
1700
1701 /*
1702 * Restart the timer if a controller reset is already scheduled. Any
1703 * timed out commands would be handled before entering the connecting
1704 * state.
1705 */
1706 if (ctrl->ctrl.state == NVME_CTRL_RESETTING)
1707 return BLK_EH_RESET_TIMER;
1708
1709 if (ctrl->ctrl.state != NVME_CTRL_LIVE) {
1710 /*
1711 * Teardown immediately if controller times out while starting
1712 * or we are already started error recovery. all outstanding
1713 * requests are completed on shutdown, so we return BLK_EH_DONE.
1714 */
1715 flush_work(&ctrl->err_work);
1716 nvme_rdma_teardown_io_queues(ctrl, false);
1717 nvme_rdma_teardown_admin_queue(ctrl, false);
1718 return BLK_EH_DONE;
1719 }
1720
1721 dev_warn(ctrl->ctrl.device, "starting error recovery\n");
1722 nvme_rdma_error_recovery(ctrl);
1723
1724 return BLK_EH_RESET_TIMER;
1725 }
1726
1727 static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
1728 const struct blk_mq_queue_data *bd)
1729 {
1730 struct nvme_ns *ns = hctx->queue->queuedata;
1731 struct nvme_rdma_queue *queue = hctx->driver_data;
1732 struct request *rq = bd->rq;
1733 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1734 struct nvme_rdma_qe *sqe = &req->sqe;
1735 struct nvme_command *c = sqe->data;
1736 struct ib_device *dev;
1737 bool queue_ready = test_bit(NVME_RDMA_Q_LIVE, &queue->flags);
1738 blk_status_t ret;
1739 int err;
1740
1741 WARN_ON_ONCE(rq->tag < 0);
1742
1743 if (!nvmf_check_ready(&queue->ctrl->ctrl, rq, queue_ready))
1744 return nvmf_fail_nonready_command(&queue->ctrl->ctrl, rq);
1745
1746 dev = queue->device->dev;
1747
1748 req->sqe.dma = ib_dma_map_single(dev, req->sqe.data,
1749 sizeof(struct nvme_command),
1750 DMA_TO_DEVICE);
1751 err = ib_dma_mapping_error(dev, req->sqe.dma);
1752 if (unlikely(err))
1753 return BLK_STS_RESOURCE;
1754
1755 ib_dma_sync_single_for_cpu(dev, sqe->dma,
1756 sizeof(struct nvme_command), DMA_TO_DEVICE);
1757
1758 ret = nvme_setup_cmd(ns, rq, c);
1759 if (ret)
1760 goto unmap_qe;
1761
1762 blk_mq_start_request(rq);
1763
1764 err = nvme_rdma_map_data(queue, rq, c);
1765 if (unlikely(err < 0)) {
1766 dev_err(queue->ctrl->ctrl.device,
1767 "Failed to map data (%d)\n", err);
1768 goto err;
1769 }
1770
1771 sqe->cqe.done = nvme_rdma_send_done;
1772
1773 ib_dma_sync_single_for_device(dev, sqe->dma,
1774 sizeof(struct nvme_command), DMA_TO_DEVICE);
1775
1776 err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
1777 req->mr ? &req->reg_wr.wr : NULL);
1778 if (unlikely(err))
1779 goto err_unmap;
1780
1781 return BLK_STS_OK;
1782
1783 err_unmap:
1784 nvme_rdma_unmap_data(queue, rq);
1785 err:
1786 if (err == -ENOMEM || err == -EAGAIN)
1787 ret = BLK_STS_RESOURCE;
1788 else
1789 ret = BLK_STS_IOERR;
1790 nvme_cleanup_cmd(rq);
1791 unmap_qe:
1792 ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command),
1793 DMA_TO_DEVICE);
1794 return ret;
1795 }
1796
1797 static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx)
1798 {
1799 struct nvme_rdma_queue *queue = hctx->driver_data;
1800
1801 return ib_process_cq_direct(queue->ib_cq, -1);
1802 }
1803
1804 static void nvme_rdma_complete_rq(struct request *rq)
1805 {
1806 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1807 struct nvme_rdma_queue *queue = req->queue;
1808 struct ib_device *ibdev = queue->device->dev;
1809
1810 nvme_rdma_unmap_data(queue, rq);
1811 ib_dma_unmap_single(ibdev, req->sqe.dma, sizeof(struct nvme_command),
1812 DMA_TO_DEVICE);
1813 nvme_complete_rq(rq);
1814 }
1815
1816 static int nvme_rdma_map_queues(struct blk_mq_tag_set *set)
1817 {
1818 struct nvme_rdma_ctrl *ctrl = set->driver_data;
1819 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
1820
1821 if (opts->nr_write_queues && ctrl->io_queues[HCTX_TYPE_READ]) {
1822 /* separate read/write queues */
1823 set->map[HCTX_TYPE_DEFAULT].nr_queues =
1824 ctrl->io_queues[HCTX_TYPE_DEFAULT];
1825 set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
1826 set->map[HCTX_TYPE_READ].nr_queues =
1827 ctrl->io_queues[HCTX_TYPE_READ];
1828 set->map[HCTX_TYPE_READ].queue_offset =
1829 ctrl->io_queues[HCTX_TYPE_DEFAULT];
1830 } else {
1831 /* shared read/write queues */
1832 set->map[HCTX_TYPE_DEFAULT].nr_queues =
1833 ctrl->io_queues[HCTX_TYPE_DEFAULT];
1834 set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
1835 set->map[HCTX_TYPE_READ].nr_queues =
1836 ctrl->io_queues[HCTX_TYPE_DEFAULT];
1837 set->map[HCTX_TYPE_READ].queue_offset = 0;
1838 }
1839 blk_mq_rdma_map_queues(&set->map[HCTX_TYPE_DEFAULT],
1840 ctrl->device->dev, 0);
1841 blk_mq_rdma_map_queues(&set->map[HCTX_TYPE_READ],
1842 ctrl->device->dev, 0);
1843
1844 if (opts->nr_poll_queues && ctrl->io_queues[HCTX_TYPE_POLL]) {
1845 /* map dedicated poll queues only if we have queues left */
1846 set->map[HCTX_TYPE_POLL].nr_queues =
1847 ctrl->io_queues[HCTX_TYPE_POLL];
1848 set->map[HCTX_TYPE_POLL].queue_offset =
1849 ctrl->io_queues[HCTX_TYPE_DEFAULT] +
1850 ctrl->io_queues[HCTX_TYPE_READ];
1851 blk_mq_map_queues(&set->map[HCTX_TYPE_POLL]);
1852 }
1853
1854 dev_info(ctrl->ctrl.device,
1855 "mapped %d/%d/%d default/read/poll queues.\n",
1856 ctrl->io_queues[HCTX_TYPE_DEFAULT],
1857 ctrl->io_queues[HCTX_TYPE_READ],
1858 ctrl->io_queues[HCTX_TYPE_POLL]);
1859
1860 return 0;
1861 }
1862
1863 static const struct blk_mq_ops nvme_rdma_mq_ops = {
1864 .queue_rq = nvme_rdma_queue_rq,
1865 .complete = nvme_rdma_complete_rq,
1866 .init_request = nvme_rdma_init_request,
1867 .exit_request = nvme_rdma_exit_request,
1868 .init_hctx = nvme_rdma_init_hctx,
1869 .timeout = nvme_rdma_timeout,
1870 .map_queues = nvme_rdma_map_queues,
1871 .poll = nvme_rdma_poll,
1872 };
1873
1874 static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
1875 .queue_rq = nvme_rdma_queue_rq,
1876 .complete = nvme_rdma_complete_rq,
1877 .init_request = nvme_rdma_init_request,
1878 .exit_request = nvme_rdma_exit_request,
1879 .init_hctx = nvme_rdma_init_admin_hctx,
1880 .timeout = nvme_rdma_timeout,
1881 };
1882
1883 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
1884 {
1885 cancel_work_sync(&ctrl->err_work);
1886 cancel_delayed_work_sync(&ctrl->reconnect_work);
1887
1888 nvme_rdma_teardown_io_queues(ctrl, shutdown);
1889 blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
1890 if (shutdown)
1891 nvme_shutdown_ctrl(&ctrl->ctrl);
1892 else
1893 nvme_disable_ctrl(&ctrl->ctrl);
1894 nvme_rdma_teardown_admin_queue(ctrl, shutdown);
1895 }
1896
1897 static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl)
1898 {
1899 nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true);
1900 }
1901
1902 static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
1903 {
1904 struct nvme_rdma_ctrl *ctrl =
1905 container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work);
1906
1907 nvme_stop_ctrl(&ctrl->ctrl);
1908 nvme_rdma_shutdown_ctrl(ctrl, false);
1909
1910 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
1911 /* state change failure should never happen */
1912 WARN_ON_ONCE(1);
1913 return;
1914 }
1915
1916 if (nvme_rdma_setup_ctrl(ctrl, false))
1917 goto out_fail;
1918
1919 return;
1920
1921 out_fail:
1922 ++ctrl->ctrl.nr_reconnects;
1923 nvme_rdma_reconnect_or_remove(ctrl);
1924 }
1925
1926 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
1927 .name = "rdma",
1928 .module = THIS_MODULE,
1929 .flags = NVME_F_FABRICS,
1930 .reg_read32 = nvmf_reg_read32,
1931 .reg_read64 = nvmf_reg_read64,
1932 .reg_write32 = nvmf_reg_write32,
1933 .free_ctrl = nvme_rdma_free_ctrl,
1934 .submit_async_event = nvme_rdma_submit_async_event,
1935 .delete_ctrl = nvme_rdma_delete_ctrl,
1936 .get_address = nvmf_get_address,
1937 };
1938
1939 /*
1940 * Fails a connection request if it matches an existing controller
1941 * (association) with the same tuple:
1942 * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN>
1943 *
1944 * if local address is not specified in the request, it will match an
1945 * existing controller with all the other parameters the same and no
1946 * local port address specified as well.
1947 *
1948 * The ports don't need to be compared as they are intrinsically
1949 * already matched by the port pointers supplied.
1950 */
1951 static bool
1952 nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts)
1953 {
1954 struct nvme_rdma_ctrl *ctrl;
1955 bool found = false;
1956
1957 mutex_lock(&nvme_rdma_ctrl_mutex);
1958 list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
1959 found = nvmf_ip_options_match(&ctrl->ctrl, opts);
1960 if (found)
1961 break;
1962 }
1963 mutex_unlock(&nvme_rdma_ctrl_mutex);
1964
1965 return found;
1966 }
1967
1968 static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
1969 struct nvmf_ctrl_options *opts)
1970 {
1971 struct nvme_rdma_ctrl *ctrl;
1972 int ret;
1973 bool changed;
1974
1975 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
1976 if (!ctrl)
1977 return ERR_PTR(-ENOMEM);
1978 ctrl->ctrl.opts = opts;
1979 INIT_LIST_HEAD(&ctrl->list);
1980
1981 if (!(opts->mask & NVMF_OPT_TRSVCID)) {
1982 opts->trsvcid =
1983 kstrdup(__stringify(NVME_RDMA_IP_PORT), GFP_KERNEL);
1984 if (!opts->trsvcid) {
1985 ret = -ENOMEM;
1986 goto out_free_ctrl;
1987 }
1988 opts->mask |= NVMF_OPT_TRSVCID;
1989 }
1990
1991 ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
1992 opts->traddr, opts->trsvcid, &ctrl->addr);
1993 if (ret) {
1994 pr_err("malformed address passed: %s:%s\n",
1995 opts->traddr, opts->trsvcid);
1996 goto out_free_ctrl;
1997 }
1998
1999 if (opts->mask & NVMF_OPT_HOST_TRADDR) {
2000 ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
2001 opts->host_traddr, NULL, &ctrl->src_addr);
2002 if (ret) {
2003 pr_err("malformed src address passed: %s\n",
2004 opts->host_traddr);
2005 goto out_free_ctrl;
2006 }
2007 }
2008
2009 if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) {
2010 ret = -EALREADY;
2011 goto out_free_ctrl;
2012 }
2013
2014 INIT_DELAYED_WORK(&ctrl->reconnect_work,
2015 nvme_rdma_reconnect_ctrl_work);
2016 INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
2017 INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work);
2018
2019 ctrl->ctrl.queue_count = opts->nr_io_queues + opts->nr_write_queues +
2020 opts->nr_poll_queues + 1;
2021 ctrl->ctrl.sqsize = opts->queue_size - 1;
2022 ctrl->ctrl.kato = opts->kato;
2023
2024 ret = -ENOMEM;
2025 ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),
2026 GFP_KERNEL);
2027 if (!ctrl->queues)
2028 goto out_free_ctrl;
2029
2030 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
2031 0 /* no quirks, we're perfect! */);
2032 if (ret)
2033 goto out_kfree_queues;
2034
2035 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
2036 WARN_ON_ONCE(!changed);
2037
2038 ret = nvme_rdma_setup_ctrl(ctrl, true);
2039 if (ret)
2040 goto out_uninit_ctrl;
2041
2042 dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
2043 ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
2044
2045 mutex_lock(&nvme_rdma_ctrl_mutex);
2046 list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
2047 mutex_unlock(&nvme_rdma_ctrl_mutex);
2048
2049 return &ctrl->ctrl;
2050
2051 out_uninit_ctrl:
2052 nvme_uninit_ctrl(&ctrl->ctrl);
2053 nvme_put_ctrl(&ctrl->ctrl);
2054 if (ret > 0)
2055 ret = -EIO;
2056 return ERR_PTR(ret);
2057 out_kfree_queues:
2058 kfree(ctrl->queues);
2059 out_free_ctrl:
2060 kfree(ctrl);
2061 return ERR_PTR(ret);
2062 }
2063
2064 static struct nvmf_transport_ops nvme_rdma_transport = {
2065 .name = "rdma",
2066 .module = THIS_MODULE,
2067 .required_opts = NVMF_OPT_TRADDR,
2068 .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
2069 NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO |
2070 NVMF_OPT_NR_WRITE_QUEUES | NVMF_OPT_NR_POLL_QUEUES |
2071 NVMF_OPT_TOS,
2072 .create_ctrl = nvme_rdma_create_ctrl,
2073 };
2074
2075 static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
2076 {
2077 struct nvme_rdma_ctrl *ctrl;
2078 struct nvme_rdma_device *ndev;
2079 bool found = false;
2080
2081 mutex_lock(&device_list_mutex);
2082 list_for_each_entry(ndev, &device_list, entry) {
2083 if (ndev->dev == ib_device) {
2084 found = true;
2085 break;
2086 }
2087 }
2088 mutex_unlock(&device_list_mutex);
2089
2090 if (!found)
2091 return;
2092
2093 /* Delete all controllers using this device */
2094 mutex_lock(&nvme_rdma_ctrl_mutex);
2095 list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2096 if (ctrl->device->dev != ib_device)
2097 continue;
2098 nvme_delete_ctrl(&ctrl->ctrl);
2099 }
2100 mutex_unlock(&nvme_rdma_ctrl_mutex);
2101
2102 flush_workqueue(nvme_delete_wq);
2103 }
2104
2105 static struct ib_client nvme_rdma_ib_client = {
2106 .name = "nvme_rdma",
2107 .remove = nvme_rdma_remove_one
2108 };
2109
2110 static int __init nvme_rdma_init_module(void)
2111 {
2112 int ret;
2113
2114 ret = ib_register_client(&nvme_rdma_ib_client);
2115 if (ret)
2116 return ret;
2117
2118 ret = nvmf_register_transport(&nvme_rdma_transport);
2119 if (ret)
2120 goto err_unreg_client;
2121
2122 return 0;
2123
2124 err_unreg_client:
2125 ib_unregister_client(&nvme_rdma_ib_client);
2126 return ret;
2127 }
2128
2129 static void __exit nvme_rdma_cleanup_module(void)
2130 {
2131 struct nvme_rdma_ctrl *ctrl;
2132
2133 nvmf_unregister_transport(&nvme_rdma_transport);
2134 ib_unregister_client(&nvme_rdma_ib_client);
2135
2136 mutex_lock(&nvme_rdma_ctrl_mutex);
2137 list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list)
2138 nvme_delete_ctrl(&ctrl->ctrl);
2139 mutex_unlock(&nvme_rdma_ctrl_mutex);
2140 flush_workqueue(nvme_delete_wq);
2141 }
2142
2143 module_init(nvme_rdma_init_module);
2144 module_exit(nvme_rdma_cleanup_module);
2145
2146 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support