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nvme: Move transports to use nvme-core workqueue
[mirror_ubuntu-bionic-kernel.git] / drivers / nvme / host / rdma.c
CommitLineData
71102307
CH		 1/*
2 * NVMe over Fabrics RDMA host code.
3 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 */
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
71102307
CH		 15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <linux/err.h>
19#include <linux/string.h>
71102307
CH		 20#include <linux/atomic.h>
21#include <linux/blk-mq.h>
22#include <linux/types.h>
23#include <linux/list.h>
24#include <linux/mutex.h>
25#include <linux/scatterlist.h>
26#include <linux/nvme.h>
71102307
CH		 27#include <asm/unaligned.h>
28
29#include <rdma/ib_verbs.h>
30#include <rdma/rdma_cm.h>
71102307
CH		 31#include <linux/nvme-rdma.h>
32
33#include "nvme.h"
34#include "fabrics.h"
35
36
782d820c 37#define NVME_RDMA_CONNECT_TIMEOUT_MS 3000 /* 3 second */
71102307
CH		 38
39#define NVME_RDMA_MAX_SEGMENT_SIZE 0xffffff /* 24-bit SGL field */
40
41#define NVME_RDMA_MAX_SEGMENTS 256
42
43#define NVME_RDMA_MAX_INLINE_SEGMENTS 1
44
71102307
CH		 45/*
46 * We handle AEN commands ourselves and don't even let the
47 * block layer know about them.
48 */
49#define NVME_RDMA_NR_AEN_COMMANDS 1
50#define NVME_RDMA_AQ_BLKMQ_DEPTH \
51 (NVMF_AQ_DEPTH - NVME_RDMA_NR_AEN_COMMANDS)
52
53struct nvme_rdma_device {
54 struct ib_device *dev;
55 struct ib_pd *pd;
71102307
CH		 56 struct kref ref;
57 struct list_head entry;
58};
59
60struct nvme_rdma_qe {
61 struct ib_cqe cqe;
62 void *data;
63 u64 dma;
64};
65
66struct nvme_rdma_queue;
67struct nvme_rdma_request {
d49187e9 68 struct nvme_request req;
71102307
CH		 69 struct ib_mr *mr;
70 struct nvme_rdma_qe sqe;
71 struct ib_sge sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
72 u32 num_sge;
73 int nents;
74 bool inline_data;
71102307
CH		 75 struct ib_reg_wr reg_wr;
76 struct ib_cqe reg_cqe;
77 struct nvme_rdma_queue *queue;
78 struct sg_table sg_table;
79 struct scatterlist first_sgl[];
80};
81
82enum nvme_rdma_queue_flags {
b282a88d 83 NVME_RDMA_Q_LIVE = 0,
abf87d5e 84 NVME_RDMA_Q_DELETING = 1,
71102307
CH		 85};
86
87struct nvme_rdma_queue {
88 struct nvme_rdma_qe *rsp_ring;
89 u8 sig_count;
90 int queue_size;
91 size_t cmnd_capsule_len;
92 struct nvme_rdma_ctrl *ctrl;
93 struct nvme_rdma_device *device;
94 struct ib_cq *ib_cq;
95 struct ib_qp *qp;
96
97 unsigned long flags;
98 struct rdma_cm_id *cm_id;
99 int cm_error;
100 struct completion cm_done;
101};
102
103struct nvme_rdma_ctrl {
71102307
CH		 104 /* read only in the hot path */
105 struct nvme_rdma_queue *queues;
106 u32 queue_count;
107
108 /* other member variables */
71102307
CH		 109 struct blk_mq_tag_set tag_set;
110 struct work_struct delete_work;
111 struct work_struct reset_work;
112 struct work_struct err_work;
113
114 struct nvme_rdma_qe async_event_sqe;
115
71102307
CH		 116 struct delayed_work reconnect_work;
117
118 struct list_head list;
119
120 struct blk_mq_tag_set admin_tag_set;
121 struct nvme_rdma_device *device;
122
123 u64 cap;
124 u32 max_fr_pages;
125
0928f9b4
SG		 126 struct sockaddr_storage addr;
127 struct sockaddr_storage src_addr;
71102307
CH		 128
129 struct nvme_ctrl ctrl;
130};
131
132static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)
133{
134 return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);
135}
136
137static LIST_HEAD(device_list);
138static DEFINE_MUTEX(device_list_mutex);
139
140static LIST_HEAD(nvme_rdma_ctrl_list);
141static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);
142
71102307
CH		 143/*
144 * Disabling this option makes small I/O goes faster, but is fundamentally
145 * unsafe. With it turned off we will have to register a global rkey that
146 * allows read and write access to all physical memory.
147 */
148static bool register_always = true;
149module_param(register_always, bool, 0444);
150MODULE_PARM_DESC(register_always,
151 "Use memory registration even for contiguous memory regions");
152
153static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
154 struct rdma_cm_event *event);
155static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
71102307
CH		 156
157/* XXX: really should move to a generic header sooner or later.. */
158static inline void put_unaligned_le24(u32 val, u8 *p)
159{
160 *p++ = val;
161 *p++ = val >> 8;
162 *p++ = val >> 16;
163}
164
165static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
166{
167 return queue - queue->ctrl->queues;
168}
169
170static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)
171{
172 return queue->cmnd_capsule_len - sizeof(struct nvme_command);
173}
174
175static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
176 size_t capsule_size, enum dma_data_direction dir)
177{
178 ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);
179 kfree(qe->data);
180}
181
182static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
183 size_t capsule_size, enum dma_data_direction dir)
184{
185 qe->data = kzalloc(capsule_size, GFP_KERNEL);
186 if (!qe->data)
187 return -ENOMEM;
188
189 qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
190 if (ib_dma_mapping_error(ibdev, qe->dma)) {
191 kfree(qe->data);
192 return -ENOMEM;
193 }
194
195 return 0;
196}
197
198static void nvme_rdma_free_ring(struct ib_device *ibdev,
199 struct nvme_rdma_qe *ring, size_t ib_queue_size,
200 size_t capsule_size, enum dma_data_direction dir)
201{
202 int i;
203
204 for (i = 0; i < ib_queue_size; i++)
205 nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);
206 kfree(ring);
207}
208
209static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,
210 size_t ib_queue_size, size_t capsule_size,
211 enum dma_data_direction dir)
212{
213 struct nvme_rdma_qe *ring;
214 int i;
215
216 ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);
217 if (!ring)
218 return NULL;
219
220 for (i = 0; i < ib_queue_size; i++) {
221 if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))
222 goto out_free_ring;
223 }
224
225 return ring;
226
227out_free_ring:
228 nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
229 return NULL;
230}
231
232static void nvme_rdma_qp_event(struct ib_event *event, void *context)
233{
27a4beef
MG		 234 pr_debug("QP event %s (%d)\n",
235 ib_event_msg(event->event), event->event);
236
71102307
CH		 237}
238
239static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)
240{
241 wait_for_completion_interruptible_timeout(&queue->cm_done,
242 msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1);
243 return queue->cm_error;
244}
245
246static 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 + NVME_RDMA_MAX_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
271static int nvme_rdma_reinit_request(void *data, struct request *rq)
272{
273 struct nvme_rdma_ctrl *ctrl = data;
274 struct nvme_rdma_device *dev = ctrl->device;
275 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
276 int ret = 0;
277
f5b7b559 278 if (!req->mr->need_inval)
71102307
CH		 279 goto out;
280
281 ib_dereg_mr(req->mr);
282
283 req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG,
284 ctrl->max_fr_pages);
285 if (IS_ERR(req->mr)) {
71102307 286 ret = PTR_ERR(req->mr);
458a9632 287 req->mr = NULL;
1bda18de 288 goto out;
71102307
CH		 289 }
290
f5b7b559 291 req->mr->need_inval = false;
71102307
CH		 292
293out:
294 return ret;
295}
296
297static void __nvme_rdma_exit_request(struct nvme_rdma_ctrl *ctrl,
298 struct request *rq, unsigned int queue_idx)
299{
300 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
301 struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
302 struct nvme_rdma_device *dev = queue->device;
303
304 if (req->mr)
305 ib_dereg_mr(req->mr);
306
307 nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
308 DMA_TO_DEVICE);
309}
310
d6296d39
CH		 311static void nvme_rdma_exit_request(struct blk_mq_tag_set *set,
312 struct request *rq, unsigned int hctx_idx)
71102307 313{
d6296d39 314 return __nvme_rdma_exit_request(set->driver_data, rq, hctx_idx + 1);
71102307
CH		 315}
316
d6296d39
CH		 317static void nvme_rdma_exit_admin_request(struct blk_mq_tag_set *set,
318 struct request *rq, unsigned int hctx_idx)
71102307 319{
d6296d39 320 return __nvme_rdma_exit_request(set->driver_data, rq, 0);
71102307
CH		 321}
322
323static int __nvme_rdma_init_request(struct nvme_rdma_ctrl *ctrl,
324 struct request *rq, unsigned int queue_idx)
325{
326 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
327 struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
328 struct nvme_rdma_device *dev = queue->device;
329 struct ib_device *ibdev = dev->dev;
330 int ret;
331
71102307
CH		 332 ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command),
333 DMA_TO_DEVICE);
334 if (ret)
335 return ret;
336
337 req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG,
338 ctrl->max_fr_pages);
339 if (IS_ERR(req->mr)) {
340 ret = PTR_ERR(req->mr);
341 goto out_free_qe;
342 }
343
344 req->queue = queue;
345
346 return 0;
347
348out_free_qe:
349 nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
350 DMA_TO_DEVICE);
351 return -ENOMEM;
352}
353
d6296d39
CH		 354static int nvme_rdma_init_request(struct blk_mq_tag_set *set,
355 struct request *rq, unsigned int hctx_idx,
356 unsigned int numa_node)
71102307 357{
d6296d39 358 return __nvme_rdma_init_request(set->driver_data, rq, hctx_idx + 1);
71102307
CH		 359}
360
d6296d39
CH		 361static int nvme_rdma_init_admin_request(struct blk_mq_tag_set *set,
362 struct request *rq, unsigned int hctx_idx,
363 unsigned int numa_node)
71102307 364{
d6296d39 365 return __nvme_rdma_init_request(set->driver_data, rq, 0);
71102307
CH		 366}
367
368static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
369 unsigned int hctx_idx)
370{
371 struct nvme_rdma_ctrl *ctrl = data;
372 struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];
373
374 BUG_ON(hctx_idx >= ctrl->queue_count);
375
376 hctx->driver_data = queue;
377 return 0;
378}
379
380static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
381 unsigned int hctx_idx)
382{
383 struct nvme_rdma_ctrl *ctrl = data;
384 struct nvme_rdma_queue *queue = &ctrl->queues[0];
385
386 BUG_ON(hctx_idx != 0);
387
388 hctx->driver_data = queue;
389 return 0;
390}
391
392static void nvme_rdma_free_dev(struct kref *ref)
393{
394 struct nvme_rdma_device *ndev =
395 container_of(ref, struct nvme_rdma_device, ref);
396
397 mutex_lock(&device_list_mutex);
398 list_del(&ndev->entry);
399 mutex_unlock(&device_list_mutex);
400
71102307 401 ib_dealloc_pd(ndev->pd);
71102307
CH		 402 kfree(ndev);
403}
404
405static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
406{
407 kref_put(&dev->ref, nvme_rdma_free_dev);
408}
409
410static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
411{
412 return kref_get_unless_zero(&dev->ref);
413}
414
415static struct nvme_rdma_device *
416nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)
417{
418 struct nvme_rdma_device *ndev;
419
420 mutex_lock(&device_list_mutex);
421 list_for_each_entry(ndev, &device_list, entry) {
422 if (ndev->dev->node_guid == cm_id->device->node_guid &&
423 nvme_rdma_dev_get(ndev))
424 goto out_unlock;
425 }
426
427 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
428 if (!ndev)
429 goto out_err;
430
431 ndev->dev = cm_id->device;
432 kref_init(&ndev->ref);
433
11975e01
CH		 434 ndev->pd = ib_alloc_pd(ndev->dev,
435 register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
71102307
CH		 436 if (IS_ERR(ndev->pd))
437 goto out_free_dev;
438
71102307
CH		 439 if (!(ndev->dev->attrs.device_cap_flags &
440 IB_DEVICE_MEM_MGT_EXTENSIONS)) {
441 dev_err(&ndev->dev->dev,
442 "Memory registrations not supported.\n");
11975e01 443 goto out_free_pd;
71102307
CH		 444 }
445
446 list_add(&ndev->entry, &device_list);
447out_unlock:
448 mutex_unlock(&device_list_mutex);
449 return ndev;
450
71102307
CH		 451out_free_pd:
452 ib_dealloc_pd(ndev->pd);
453out_free_dev:
454 kfree(ndev);
455out_err:
456 mutex_unlock(&device_list_mutex);
457 return NULL;
458}
459
460static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)
461{
f361e5a0
SW		 462 struct nvme_rdma_device *dev;
463 struct ib_device *ibdev;
71102307 464
f361e5a0
SW		 465 dev = queue->device;
466 ibdev = dev->dev;
71102307
CH		 467 rdma_destroy_qp(queue->cm_id);
468 ib_free_cq(queue->ib_cq);
469
470 nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
471 sizeof(struct nvme_completion), DMA_FROM_DEVICE);
472
473 nvme_rdma_dev_put(dev);
474}
475
ca6e95bb 476static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue)
71102307 477{
ca6e95bb 478 struct ib_device *ibdev;
71102307
CH		 479 const int send_wr_factor = 3; /* MR, SEND, INV */
480 const int cq_factor = send_wr_factor + 1; /* + RECV */
481 int comp_vector, idx = nvme_rdma_queue_idx(queue);
71102307
CH		 482 int ret;
483
ca6e95bb
SG		 484 queue->device = nvme_rdma_find_get_device(queue->cm_id);
485 if (!queue->device) {
486 dev_err(queue->cm_id->device->dev.parent,
487 "no client data found!\n");
488 return -ECONNREFUSED;
489 }
490 ibdev = queue->device->dev;
71102307
CH		 491
492 /*
493 * The admin queue is barely used once the controller is live, so don't
494 * bother to spread it out.
495 */
496 if (idx == 0)
497 comp_vector = 0;
498 else
499 comp_vector = idx % ibdev->num_comp_vectors;
500
501
502 /* +1 for ib_stop_cq */
ca6e95bb
SG		 503 queue->ib_cq = ib_alloc_cq(ibdev, queue,
504 cq_factor * queue->queue_size + 1,
505 comp_vector, IB_POLL_SOFTIRQ);
71102307
CH		 506 if (IS_ERR(queue->ib_cq)) {
507 ret = PTR_ERR(queue->ib_cq);
ca6e95bb 508 goto out_put_dev;
71102307
CH		 509 }
510
511 ret = nvme_rdma_create_qp(queue, send_wr_factor);
512 if (ret)
513 goto out_destroy_ib_cq;
514
515 queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,
516 sizeof(struct nvme_completion), DMA_FROM_DEVICE);
517 if (!queue->rsp_ring) {
518 ret = -ENOMEM;
519 goto out_destroy_qp;
520 }
521
522 return 0;
523
524out_destroy_qp:
525 ib_destroy_qp(queue->qp);
526out_destroy_ib_cq:
527 ib_free_cq(queue->ib_cq);
ca6e95bb
SG		 528out_put_dev:
529 nvme_rdma_dev_put(queue->device);
71102307
CH		 530 return ret;
531}
532
533static int nvme_rdma_init_queue(struct nvme_rdma_ctrl *ctrl,
534 int idx, size_t queue_size)
535{
536 struct nvme_rdma_queue *queue;
8f4e8dac 537 struct sockaddr *src_addr = NULL;
71102307
CH		 538 int ret;
539
540 queue = &ctrl->queues[idx];
541 queue->ctrl = ctrl;
542 init_completion(&queue->cm_done);
543
544 if (idx > 0)
545 queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
546 else
547 queue->cmnd_capsule_len = sizeof(struct nvme_command);
548
549 queue->queue_size = queue_size;
550
551 queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,
552 RDMA_PS_TCP, IB_QPT_RC);
553 if (IS_ERR(queue->cm_id)) {
554 dev_info(ctrl->ctrl.device,
555 "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
556 return PTR_ERR(queue->cm_id);
557 }
558
8f4e8dac 559 if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
0928f9b4 560 src_addr = (struct sockaddr *)&ctrl->src_addr;
8f4e8dac 561
0928f9b4
SG		 562 queue->cm_error = -ETIMEDOUT;
563 ret = rdma_resolve_addr(queue->cm_id, src_addr,
564 (struct sockaddr *)&ctrl->addr,
71102307
CH		 565 NVME_RDMA_CONNECT_TIMEOUT_MS);
566 if (ret) {
567 dev_info(ctrl->ctrl.device,
568 "rdma_resolve_addr failed (%d).\n", ret);
569 goto out_destroy_cm_id;
570 }
571
572 ret = nvme_rdma_wait_for_cm(queue);
573 if (ret) {
574 dev_info(ctrl->ctrl.device,
575 "rdma_resolve_addr wait failed (%d).\n", ret);
576 goto out_destroy_cm_id;
577 }
578
3b4ac786 579 clear_bit(NVME_RDMA_Q_DELETING, &queue->flags);
71102307
CH		 580
581 return 0;
582
583out_destroy_cm_id:
584 rdma_destroy_id(queue->cm_id);
585 return ret;
586}
587
588static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
589{
590 rdma_disconnect(queue->cm_id);
591 ib_drain_qp(queue->qp);
592}
593
594static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
595{
596 nvme_rdma_destroy_queue_ib(queue);
597 rdma_destroy_id(queue->cm_id);
598}
599
600static void nvme_rdma_stop_and_free_queue(struct nvme_rdma_queue *queue)
601{
e89ca58f 602 if (test_and_set_bit(NVME_RDMA_Q_DELETING, &queue->flags))
71102307
CH		 603 return;
604 nvme_rdma_stop_queue(queue);
605 nvme_rdma_free_queue(queue);
606}
607
608static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
609{
610 int i;
611
612 for (i = 1; i < ctrl->queue_count; i++)
613 nvme_rdma_stop_and_free_queue(&ctrl->queues[i]);
614}
615
616static int nvme_rdma_connect_io_queues(struct nvme_rdma_ctrl *ctrl)
617{
618 int i, ret = 0;
619
620 for (i = 1; i < ctrl->queue_count; i++) {
621 ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
c8dbc37c
SW		 622 if (ret) {
623 dev_info(ctrl->ctrl.device,
624 "failed to connect i/o queue: %d\n", ret);
625 goto out_free_queues;
626 }
553cd9ef 627 set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[i].flags);
71102307
CH		 628 }
629
c8dbc37c
SW		 630 return 0;
631
632out_free_queues:
633 nvme_rdma_free_io_queues(ctrl);
71102307
CH		 634 return ret;
635}
636
637static int nvme_rdma_init_io_queues(struct nvme_rdma_ctrl *ctrl)
638{
c248c643
SG		 639 struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
640 unsigned int nr_io_queues;
71102307
CH		 641 int i, ret;
642
c248c643
SG		 643 nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
644 ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
645 if (ret)
646 return ret;
647
648 ctrl->queue_count = nr_io_queues + 1;
649 if (ctrl->queue_count < 2)
650 return 0;
651
652 dev_info(ctrl->ctrl.device,
653 "creating %d I/O queues.\n", nr_io_queues);
654
71102307 655 for (i = 1; i < ctrl->queue_count; i++) {
c5af8654
JF		 656 ret = nvme_rdma_init_queue(ctrl, i,
657 ctrl->ctrl.opts->queue_size);
71102307
CH		 658 if (ret) {
659 dev_info(ctrl->ctrl.device,
660 "failed to initialize i/o queue: %d\n", ret);
661 goto out_free_queues;
662 }
663 }
664
665 return 0;
666
667out_free_queues:
f361e5a0 668 for (i--; i >= 1; i--)
71102307
CH		 669 nvme_rdma_stop_and_free_queue(&ctrl->queues[i]);
670
671 return ret;
672}
673
674static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl)
675{
676 nvme_rdma_free_qe(ctrl->queues[0].device->dev, &ctrl->async_event_sqe,
677 sizeof(struct nvme_command), DMA_TO_DEVICE);
678 nvme_rdma_stop_and_free_queue(&ctrl->queues[0]);
679 blk_cleanup_queue(ctrl->ctrl.admin_q);
680 blk_mq_free_tag_set(&ctrl->admin_tag_set);
681 nvme_rdma_dev_put(ctrl->device);
682}
683
684static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
685{
686 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
687
688 if (list_empty(&ctrl->list))
689 goto free_ctrl;
690
691 mutex_lock(&nvme_rdma_ctrl_mutex);
692 list_del(&ctrl->list);
693 mutex_unlock(&nvme_rdma_ctrl_mutex);
694
71102307
CH		 695 kfree(ctrl->queues);
696 nvmf_free_options(nctrl->opts);
697free_ctrl:
698 kfree(ctrl);
699}
700
fd8563ce
SG		 701static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl)
702{
703 /* If we are resetting/deleting then do nothing */
704 if (ctrl->ctrl.state != NVME_CTRL_RECONNECTING) {
705 WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
706 ctrl->ctrl.state == NVME_CTRL_LIVE);
707 return;
708 }
709
710 if (nvmf_should_reconnect(&ctrl->ctrl)) {
711 dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n",
712 ctrl->ctrl.opts->reconnect_delay);
9a6327d2 713 queue_delayed_work(nvme_wq, &ctrl->reconnect_work,
fd8563ce
SG		 714 ctrl->ctrl.opts->reconnect_delay * HZ);
715 } else {
716 dev_info(ctrl->ctrl.device, "Removing controller...\n");
9a6327d2 717 queue_work(nvme_wq, &ctrl->delete_work);
fd8563ce
SG		 718 }
719}
720
71102307
CH		 721static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)
722{
723 struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),
724 struct nvme_rdma_ctrl, reconnect_work);
725 bool changed;
726 int ret;
727
fd8563ce
SG		 728 ++ctrl->ctrl.opts->nr_reconnects;
729
71102307
CH		 730 if (ctrl->queue_count > 1) {
731 nvme_rdma_free_io_queues(ctrl);
732
733 ret = blk_mq_reinit_tagset(&ctrl->tag_set);
734 if (ret)
735 goto requeue;
736 }
737
738 nvme_rdma_stop_and_free_queue(&ctrl->queues[0]);
739
740 ret = blk_mq_reinit_tagset(&ctrl->admin_tag_set);
741 if (ret)
742 goto requeue;
743
744 ret = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH);
745 if (ret)
746 goto requeue;
747
71102307
CH		 748 ret = nvmf_connect_admin_queue(&ctrl->ctrl);
749 if (ret)
e818a5b4 750 goto requeue;
71102307 751
553cd9ef
CH		 752 set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[0].flags);
753
71102307
CH		 754 ret = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
755 if (ret)
e818a5b4 756 goto requeue;
71102307
CH		 757
758 nvme_start_keep_alive(&ctrl->ctrl);
759
760 if (ctrl->queue_count > 1) {
761 ret = nvme_rdma_init_io_queues(ctrl);
762 if (ret)
e818a5b4 763 goto requeue;
71102307
CH		 764
765 ret = nvme_rdma_connect_io_queues(ctrl);
766 if (ret)
e818a5b4 767 goto requeue;
71102307
CH		 768 }
769
770 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
771 WARN_ON_ONCE(!changed);
fd8563ce 772 ctrl->ctrl.opts->nr_reconnects = 0;
71102307 773
5f372eb3 774 if (ctrl->queue_count > 1) {
5f372eb3 775 nvme_queue_scan(&ctrl->ctrl);
3ef1b4b2 776 nvme_queue_async_events(&ctrl->ctrl);
5f372eb3 777 }
71102307
CH		 778
779 dev_info(ctrl->ctrl.device, "Successfully reconnected\n");
780
781 return;
782
71102307 783requeue:
fd8563ce
SG		 784 dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n",
785 ctrl->ctrl.opts->nr_reconnects);
786 nvme_rdma_reconnect_or_remove(ctrl);
71102307
CH		 787}
788
789static void nvme_rdma_error_recovery_work(struct work_struct *work)
790{
791 struct nvme_rdma_ctrl *ctrl = container_of(work,
792 struct nvme_rdma_ctrl, err_work);
e89ca58f 793 int i;
71102307
CH		 794
795 nvme_stop_keep_alive(&ctrl->ctrl);
e89ca58f 796
b282a88d 797 for (i = 0; i < ctrl->queue_count; i++)
553cd9ef 798 clear_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[i].flags);
e89ca58f 799
71102307
CH		 800 if (ctrl->queue_count > 1)
801 nvme_stop_queues(&ctrl->ctrl);
802 blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
803
804 /* We must take care of fastfail/requeue all our inflight requests */
805 if (ctrl->queue_count > 1)
806 blk_mq_tagset_busy_iter(&ctrl->tag_set,
807 nvme_cancel_request, &ctrl->ctrl);
808 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
809 nvme_cancel_request, &ctrl->ctrl);
810
e818a5b4
SG		 811 /*
812 * queues are not a live anymore, so restart the queues to fail fast
813 * new IO
814 */
815 blk_mq_start_stopped_hw_queues(ctrl->ctrl.admin_q, true);
816 nvme_start_queues(&ctrl->ctrl);
817
fd8563ce 818 nvme_rdma_reconnect_or_remove(ctrl);
71102307
CH		 819}
820
821static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
822{
823 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING))
824 return;
825
9a6327d2 826 queue_work(nvme_wq, &ctrl->err_work);
71102307
CH		 827}
828
829static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,
830 const char *op)
831{
832 struct nvme_rdma_queue *queue = cq->cq_context;
833 struct nvme_rdma_ctrl *ctrl = queue->ctrl;
834
835 if (ctrl->ctrl.state == NVME_CTRL_LIVE)
836 dev_info(ctrl->ctrl.device,
837 "%s for CQE 0x%p failed with status %s (%d)\n",
838 op, wc->wr_cqe,
839 ib_wc_status_msg(wc->status), wc->status);
840 nvme_rdma_error_recovery(ctrl);
841}
842
843static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
844{
845 if (unlikely(wc->status != IB_WC_SUCCESS))
846 nvme_rdma_wr_error(cq, wc, "MEMREG");
847}
848
849static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
850{
851 if (unlikely(wc->status != IB_WC_SUCCESS))
852 nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
853}
854
855static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
856 struct nvme_rdma_request *req)
857{
858 struct ib_send_wr *bad_wr;
859 struct ib_send_wr wr = {
860 .opcode = IB_WR_LOCAL_INV,
861 .next = NULL,
862 .num_sge = 0,
863 .send_flags = 0,
864 .ex.invalidate_rkey = req->mr->rkey,
865 };
866
867 req->reg_cqe.done = nvme_rdma_inv_rkey_done;
868 wr.wr_cqe = &req->reg_cqe;
869
870 return ib_post_send(queue->qp, &wr, &bad_wr);
871}
872
873static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
874 struct request *rq)
875{
876 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
877 struct nvme_rdma_ctrl *ctrl = queue->ctrl;
878 struct nvme_rdma_device *dev = queue->device;
879 struct ib_device *ibdev = dev->dev;
880 int res;
881
882 if (!blk_rq_bytes(rq))
883 return;
884
f5b7b559 885 if (req->mr->need_inval) {
71102307
CH		 886 res = nvme_rdma_inv_rkey(queue, req);
887 if (res < 0) {
888 dev_err(ctrl->ctrl.device,
889 "Queueing INV WR for rkey %#x failed (%d)\n",
890 req->mr->rkey, res);
891 nvme_rdma_error_recovery(queue->ctrl);
892 }
893 }
894
895 ib_dma_unmap_sg(ibdev, req->sg_table.sgl,
896 req->nents, rq_data_dir(rq) ==
897 WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
898
899 nvme_cleanup_cmd(rq);
900 sg_free_table_chained(&req->sg_table, true);
901}
902
903static int nvme_rdma_set_sg_null(struct nvme_command *c)
904{
905 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
906
907 sg->addr = 0;
908 put_unaligned_le24(0, sg->length);
909 put_unaligned_le32(0, sg->key);
910 sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
911 return 0;
912}
913
914static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
915 struct nvme_rdma_request *req, struct nvme_command *c)
916{
917 struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
918
919 req->sge[1].addr = sg_dma_address(req->sg_table.sgl);
920 req->sge[1].length = sg_dma_len(req->sg_table.sgl);
921 req->sge[1].lkey = queue->device->pd->local_dma_lkey;
922
923 sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
924 sg->length = cpu_to_le32(sg_dma_len(req->sg_table.sgl));
925 sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
926
927 req->inline_data = true;
928 req->num_sge++;
929 return 0;
930}
931
932static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,
933 struct nvme_rdma_request *req, struct nvme_command *c)
934{
935 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
936
937 sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl));
938 put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length);
11975e01 939 put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
71102307
CH		 940 sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
941 return 0;
942}
943
944static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
945 struct nvme_rdma_request *req, struct nvme_command *c,
946 int count)
947{
948 struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
949 int nr;
950
951 nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, PAGE_SIZE);
952 if (nr < count) {
953 if (nr < 0)
954 return nr;
955 return -EINVAL;
956 }
957
958 ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
959
960 req->reg_cqe.done = nvme_rdma_memreg_done;
961 memset(&req->reg_wr, 0, sizeof(req->reg_wr));
962 req->reg_wr.wr.opcode = IB_WR_REG_MR;
963 req->reg_wr.wr.wr_cqe = &req->reg_cqe;
964 req->reg_wr.wr.num_sge = 0;
965 req->reg_wr.mr = req->mr;
966 req->reg_wr.key = req->mr->rkey;
967 req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |
968 IB_ACCESS_REMOTE_READ |
969 IB_ACCESS_REMOTE_WRITE;
970
f5b7b559 971 req->mr->need_inval = true;
71102307
CH		 972
973 sg->addr = cpu_to_le64(req->mr->iova);
974 put_unaligned_le24(req->mr->length, sg->length);
975 put_unaligned_le32(req->mr->rkey, sg->key);
976 sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |
977 NVME_SGL_FMT_INVALIDATE;
978
979 return 0;
980}
981
982static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
b131c61d 983 struct request *rq, struct nvme_command *c)
71102307
CH		 984{
985 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
986 struct nvme_rdma_device *dev = queue->device;
987 struct ib_device *ibdev = dev->dev;
f9d03f96 988 int count, ret;
71102307
CH		 989
990 req->num_sge = 1;
991 req->inline_data = false;
f5b7b559 992 req->mr->need_inval = false;
71102307
CH		 993
994 c->common.flags |= NVME_CMD_SGL_METABUF;
995
996 if (!blk_rq_bytes(rq))
997 return nvme_rdma_set_sg_null(c);
998
999 req->sg_table.sgl = req->first_sgl;
f9d03f96
CH		 1000 ret = sg_alloc_table_chained(&req->sg_table,
1001 blk_rq_nr_phys_segments(rq), req->sg_table.sgl);
71102307
CH		 1002 if (ret)
1003 return -ENOMEM;
1004
f9d03f96 1005 req->nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl);
71102307 1006
f9d03f96 1007 count = ib_dma_map_sg(ibdev, req->sg_table.sgl, req->nents,
71102307
CH		 1008 rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
1009 if (unlikely(count <= 0)) {
1010 sg_free_table_chained(&req->sg_table, true);
1011 return -EIO;
1012 }
1013
1014 if (count == 1) {
b131c61d
CH		 1015 if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&
1016 blk_rq_payload_bytes(rq) <=
1017 nvme_rdma_inline_data_size(queue))
71102307
CH		 1018 return nvme_rdma_map_sg_inline(queue, req, c);
1019
11975e01 1020 if (dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
71102307
CH		 1021 return nvme_rdma_map_sg_single(queue, req, c);
1022 }
1023
1024 return nvme_rdma_map_sg_fr(queue, req, c, count);
1025}
1026
1027static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
1028{
1029 if (unlikely(wc->status != IB_WC_SUCCESS))
1030 nvme_rdma_wr_error(cq, wc, "SEND");
1031}
1032
0544f549
MR		 1033static inline int nvme_rdma_queue_sig_limit(struct nvme_rdma_queue *queue)
1034{
1035 int sig_limit;
1036
1037 /*
1038 * We signal completion every queue depth/2 and also handle the
1039 * degenerated case of a device with queue_depth=1, where we
1040 * would need to signal every message.
1041 */
1042 sig_limit = max(queue->queue_size / 2, 1);
1043 return (++queue->sig_count % sig_limit) == 0;
1044}
1045
71102307
CH		 1046static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
1047 struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
1048 struct ib_send_wr *first, bool flush)
1049{
1050 struct ib_send_wr wr, *bad_wr;
1051 int ret;
1052
1053 sge->addr = qe->dma;
1054 sge->length = sizeof(struct nvme_command),
1055 sge->lkey = queue->device->pd->local_dma_lkey;
1056
1057 qe->cqe.done = nvme_rdma_send_done;
1058
1059 wr.next = NULL;
1060 wr.wr_cqe = &qe->cqe;
1061 wr.sg_list = sge;
1062 wr.num_sge = num_sge;
1063 wr.opcode = IB_WR_SEND;
1064 wr.send_flags = 0;
1065
1066 /*
1067 * Unsignalled send completions are another giant desaster in the
1068 * IB Verbs spec: If we don't regularly post signalled sends
1069 * the send queue will fill up and only a QP reset will rescue us.
1070 * Would have been way to obvious to handle this in hardware or
1071 * at least the RDMA stack..
1072 *
71102307
CH		 1073 * Always signal the flushes. The magic request used for the flush
1074 * sequencer is not allocated in our driver's tagset and it's
1075 * triggered to be freed by blk_cleanup_queue(). So we need to
1076 * always mark it as signaled to ensure that the "wr_cqe", which is
b43daedc 1077 * embedded in request's payload, is not freed when __ib_process_cq()
71102307
CH		 1078 * calls wr_cqe->done().
1079 */
0544f549 1080 if (nvme_rdma_queue_sig_limit(queue) || flush)
71102307
CH		 1081 wr.send_flags |= IB_SEND_SIGNALED;
1082
1083 if (first)
1084 first->next = &wr;
1085 else
1086 first = &wr;
1087
1088 ret = ib_post_send(queue->qp, first, &bad_wr);
1089 if (ret) {
1090 dev_err(queue->ctrl->ctrl.device,
1091 "%s failed with error code %d\n", __func__, ret);
1092 }
1093 return ret;
1094}
1095
1096static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
1097 struct nvme_rdma_qe *qe)
1098{
1099 struct ib_recv_wr wr, *bad_wr;
1100 struct ib_sge list;
1101 int ret;
1102
1103 list.addr = qe->dma;
1104 list.length = sizeof(struct nvme_completion);
1105 list.lkey = queue->device->pd->local_dma_lkey;
1106
1107 qe->cqe.done = nvme_rdma_recv_done;
1108
1109 wr.next = NULL;
1110 wr.wr_cqe = &qe->cqe;
1111 wr.sg_list = &list;
1112 wr.num_sge = 1;
1113
1114 ret = ib_post_recv(queue->qp, &wr, &bad_wr);
1115 if (ret) {
1116 dev_err(queue->ctrl->ctrl.device,
1117 "%s failed with error code %d\n", __func__, ret);
1118 }
1119 return ret;
1120}
1121
1122static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
1123{
1124 u32 queue_idx = nvme_rdma_queue_idx(queue);
1125
1126 if (queue_idx == 0)
1127 return queue->ctrl->admin_tag_set.tags[queue_idx];
1128 return queue->ctrl->tag_set.tags[queue_idx - 1];
1129}
1130
1131static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg, int aer_idx)
1132{
1133 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
1134 struct nvme_rdma_queue *queue = &ctrl->queues[0];
1135 struct ib_device *dev = queue->device->dev;
1136 struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
1137 struct nvme_command *cmd = sqe->data;
1138 struct ib_sge sge;
1139 int ret;
1140
1141 if (WARN_ON_ONCE(aer_idx != 0))
1142 return;
1143
1144 ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);
1145
1146 memset(cmd, 0, sizeof(*cmd));
1147 cmd->common.opcode = nvme_admin_async_event;
1148 cmd->common.command_id = NVME_RDMA_AQ_BLKMQ_DEPTH;
1149 cmd->common.flags |= NVME_CMD_SGL_METABUF;
1150 nvme_rdma_set_sg_null(cmd);
1151
1152 ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
1153 DMA_TO_DEVICE);
1154
1155 ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL, false);
1156 WARN_ON_ONCE(ret);
1157}
1158
1159static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
1160 struct nvme_completion *cqe, struct ib_wc *wc, int tag)
1161{
71102307
CH		 1162 struct request *rq;
1163 struct nvme_rdma_request *req;
1164 int ret = 0;
1165
71102307
CH		 1166 rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id);
1167 if (!rq) {
1168 dev_err(queue->ctrl->ctrl.device,
1169 "tag 0x%x on QP %#x not found\n",
1170 cqe->command_id, queue->qp->qp_num);
1171 nvme_rdma_error_recovery(queue->ctrl);
1172 return ret;
1173 }
1174 req = blk_mq_rq_to_pdu(rq);
1175
71102307
CH		 1176 if (rq->tag == tag)
1177 ret = 1;
1178
1179 if ((wc->wc_flags & IB_WC_WITH_INVALIDATE) &&
1180 wc->ex.invalidate_rkey == req->mr->rkey)
f5b7b559 1181 req->mr->need_inval = false;
71102307 1182
27fa9bc5 1183 nvme_end_request(rq, cqe->status, cqe->result);
71102307
CH		 1184 return ret;
1185}
1186
1187static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag)
1188{
1189 struct nvme_rdma_qe *qe =
1190 container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
1191 struct nvme_rdma_queue *queue = cq->cq_context;
1192 struct ib_device *ibdev = queue->device->dev;
1193 struct nvme_completion *cqe = qe->data;
1194 const size_t len = sizeof(struct nvme_completion);
1195 int ret = 0;
1196
1197 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1198 nvme_rdma_wr_error(cq, wc, "RECV");
1199 return 0;
1200 }
1201
1202 ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1203 /*
1204 * AEN requests are special as they don't time out and can
1205 * survive any kind of queue freeze and often don't respond to
1206 * aborts. We don't even bother to allocate a struct request
1207 * for them but rather special case them here.
1208 */
1209 if (unlikely(nvme_rdma_queue_idx(queue) == 0 &&
1210 cqe->command_id >= NVME_RDMA_AQ_BLKMQ_DEPTH))
7bf58533
CH		 1211 nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
1212 &cqe->result);
71102307
CH		 1213 else
1214 ret = nvme_rdma_process_nvme_rsp(queue, cqe, wc, tag);
1215 ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);
1216
1217 nvme_rdma_post_recv(queue, qe);
1218 return ret;
1219}
1220
1221static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1222{
1223 __nvme_rdma_recv_done(cq, wc, -1);
1224}
1225
1226static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
1227{
1228 int ret, i;
1229
1230 for (i = 0; i < queue->queue_size; i++) {
1231 ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
1232 if (ret)
1233 goto out_destroy_queue_ib;
1234 }
1235
1236 return 0;
1237
1238out_destroy_queue_ib:
1239 nvme_rdma_destroy_queue_ib(queue);
1240 return ret;
1241}
1242
1243static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
1244 struct rdma_cm_event *ev)
1245{
7f03953c
SW		 1246 struct rdma_cm_id *cm_id = queue->cm_id;
1247 int status = ev->status;
1248 const char *rej_msg;
1249 const struct nvme_rdma_cm_rej *rej_data;
1250 u8 rej_data_len;
1251
1252 rej_msg = rdma_reject_msg(cm_id, status);
1253 rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);
1254
1255 if (rej_data && rej_data_len >= sizeof(u16)) {
1256 u16 sts = le16_to_cpu(rej_data->sts);
71102307
CH		 1257
1258 dev_err(queue->ctrl->ctrl.device,
7f03953c
SW		 1259 "Connect rejected: status %d (%s) nvme status %d (%s).\n",
1260 status, rej_msg, sts, nvme_rdma_cm_msg(sts));
71102307
CH		 1261 } else {
1262 dev_err(queue->ctrl->ctrl.device,
7f03953c 1263 "Connect rejected: status %d (%s).\n", status, rej_msg);
71102307
CH		 1264 }
1265
1266 return -ECONNRESET;
1267}
1268
1269static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
1270{
71102307
CH		 1271 int ret;
1272
ca6e95bb
SG		 1273 ret = nvme_rdma_create_queue_ib(queue);
1274 if (ret)
1275 return ret;
71102307
CH		 1276
1277 ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS);
1278 if (ret) {
1279 dev_err(queue->ctrl->ctrl.device,
1280 "rdma_resolve_route failed (%d).\n",
1281 queue->cm_error);
1282 goto out_destroy_queue;
1283 }
1284
1285 return 0;
1286
1287out_destroy_queue:
1288 nvme_rdma_destroy_queue_ib(queue);
71102307
CH		 1289 return ret;
1290}
1291
1292static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
1293{
1294 struct nvme_rdma_ctrl *ctrl = queue->ctrl;
1295 struct rdma_conn_param param = { };
0b857b44 1296 struct nvme_rdma_cm_req priv = { };
71102307
CH		 1297 int ret;
1298
1299 param.qp_num = queue->qp->qp_num;
1300 param.flow_control = 1;
1301
1302 param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
2ac17c28
SG		 1303 /* maximum retry count */
1304 param.retry_count = 7;
71102307
CH		 1305 param.rnr_retry_count = 7;
1306 param.private_data = &priv;
1307 param.private_data_len = sizeof(priv);
1308
1309 priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
1310 priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
f994d9dc
JF		 1311 /*
1312 * set the admin queue depth to the minimum size
1313 * specified by the Fabrics standard.
1314 */
1315 if (priv.qid == 0) {
1316 priv.hrqsize = cpu_to_le16(NVMF_AQ_DEPTH);
1317 priv.hsqsize = cpu_to_le16(NVMF_AQ_DEPTH - 1);
1318 } else {
c5af8654
JF		 1319 /*
1320 * current interpretation of the fabrics spec
1321 * is at minimum you make hrqsize sqsize+1, or a
1322 * 1's based representation of sqsize.
1323 */
f994d9dc 1324 priv.hrqsize = cpu_to_le16(queue->queue_size);
c5af8654 1325 priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
f994d9dc 1326 }
71102307
CH		 1327
1328 ret = rdma_connect(queue->cm_id, &param);
1329 if (ret) {
1330 dev_err(ctrl->ctrl.device,
1331 "rdma_connect failed (%d).\n", ret);
1332 goto out_destroy_queue_ib;
1333 }
1334
1335 return 0;
1336
1337out_destroy_queue_ib:
1338 nvme_rdma_destroy_queue_ib(queue);
1339 return ret;
1340}
1341
71102307
CH		 1342static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
1343 struct rdma_cm_event *ev)
1344{
1345 struct nvme_rdma_queue *queue = cm_id->context;
1346 int cm_error = 0;
1347
1348 dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
1349 rdma_event_msg(ev->event), ev->event,
1350 ev->status, cm_id);
1351
1352 switch (ev->event) {
1353 case RDMA_CM_EVENT_ADDR_RESOLVED:
1354 cm_error = nvme_rdma_addr_resolved(queue);
1355 break;
1356 case RDMA_CM_EVENT_ROUTE_RESOLVED:
1357 cm_error = nvme_rdma_route_resolved(queue);
1358 break;
1359 case RDMA_CM_EVENT_ESTABLISHED:
1360 queue->cm_error = nvme_rdma_conn_established(queue);
1361 /* complete cm_done regardless of success/failure */
1362 complete(&queue->cm_done);
1363 return 0;
1364 case RDMA_CM_EVENT_REJECTED:
abf87d5e 1365 nvme_rdma_destroy_queue_ib(queue);
71102307
CH		 1366 cm_error = nvme_rdma_conn_rejected(queue, ev);
1367 break;
71102307
CH		 1368 case RDMA_CM_EVENT_ROUTE_ERROR:
1369 case RDMA_CM_EVENT_CONNECT_ERROR:
1370 case RDMA_CM_EVENT_UNREACHABLE:
abf87d5e
SG		 1371 nvme_rdma_destroy_queue_ib(queue);
1372 case RDMA_CM_EVENT_ADDR_ERROR:
71102307
CH		 1373 dev_dbg(queue->ctrl->ctrl.device,
1374 "CM error event %d\n", ev->event);
1375 cm_error = -ECONNRESET;
1376 break;
1377 case RDMA_CM_EVENT_DISCONNECTED:
1378 case RDMA_CM_EVENT_ADDR_CHANGE:
1379 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
1380 dev_dbg(queue->ctrl->ctrl.device,
1381 "disconnect received - connection closed\n");
1382 nvme_rdma_error_recovery(queue->ctrl);
1383 break;
1384 case RDMA_CM_EVENT_DEVICE_REMOVAL:
e87a911f
SW		 1385 /* device removal is handled via the ib_client API */
1386 break;
71102307
CH		 1387 default:
1388 dev_err(queue->ctrl->ctrl.device,
1389 "Unexpected RDMA CM event (%d)\n", ev->event);
1390 nvme_rdma_error_recovery(queue->ctrl);
1391 break;
1392 }
1393
1394 if (cm_error) {
1395 queue->cm_error = cm_error;
1396 complete(&queue->cm_done);
1397 }
1398
1399 return 0;
1400}
1401
1402static enum blk_eh_timer_return
1403nvme_rdma_timeout(struct request *rq, bool reserved)
1404{
1405 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1406
1407 /* queue error recovery */
1408 nvme_rdma_error_recovery(req->queue->ctrl);
1409
1410 /* fail with DNR on cmd timeout */
27fa9bc5 1411 nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR;
71102307
CH		 1412
1413 return BLK_EH_HANDLED;
1414}
1415
553cd9ef
CH		 1416/*
1417 * We cannot accept any other command until the Connect command has completed.
1418 */
a104c9f2
CH		 1419static inline blk_status_t
1420nvme_rdma_queue_is_ready(struct nvme_rdma_queue *queue, struct request *rq)
553cd9ef
CH		 1421{
1422 if (unlikely(!test_bit(NVME_RDMA_Q_LIVE, &queue->flags))) {
1392370e 1423 struct nvme_command *cmd = nvme_req(rq)->cmd;
553cd9ef 1424
57292b58 1425 if (!blk_rq_is_passthrough(rq) ||
553cd9ef 1426 cmd->common.opcode != nvme_fabrics_command ||
e818a5b4
SG		 1427 cmd->fabrics.fctype != nvme_fabrics_type_connect) {
1428 /*
1429 * reconnecting state means transport disruption, which
1430 * can take a long time and even might fail permanently,
1431 * so we can't let incoming I/O be requeued forever.
1432 * fail it fast to allow upper layers a chance to
1433 * failover.
1434 */
1435 if (queue->ctrl->ctrl.state == NVME_CTRL_RECONNECTING)
a104c9f2
CH		 1436 return BLK_STS_IOERR;
1437 return BLK_STS_RESOURCE; /* try again later */
e818a5b4 1438 }
553cd9ef
CH		 1439 }
1440
e818a5b4 1441 return 0;
553cd9ef
CH		 1442}
1443
fc17b653 1444static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
71102307
CH		 1445 const struct blk_mq_queue_data *bd)
1446{
1447 struct nvme_ns *ns = hctx->queue->queuedata;
1448 struct nvme_rdma_queue *queue = hctx->driver_data;
1449 struct request *rq = bd->rq;
1450 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
1451 struct nvme_rdma_qe *sqe = &req->sqe;
1452 struct nvme_command *c = sqe->data;
1453 bool flush = false;
1454 struct ib_device *dev;
fc17b653
CH		 1455 blk_status_t ret;
1456 int err;
71102307
CH		 1457
1458 WARN_ON_ONCE(rq->tag < 0);
1459
e818a5b4
SG		 1460 ret = nvme_rdma_queue_is_ready(queue, rq);
1461 if (unlikely(ret))
a104c9f2 1462 return ret;
553cd9ef 1463
71102307
CH		 1464 dev = queue->device->dev;
1465 ib_dma_sync_single_for_cpu(dev, sqe->dma,
1466 sizeof(struct nvme_command), DMA_TO_DEVICE);
1467
1468 ret = nvme_setup_cmd(ns, rq, c);
fc17b653 1469 if (ret)
71102307
CH		 1470 return ret;
1471
71102307
CH		 1472 blk_mq_start_request(rq);
1473
fc17b653
CH		 1474 err = nvme_rdma_map_data(queue, rq, c);
1475 if (err < 0) {
71102307 1476 dev_err(queue->ctrl->ctrl.device,
fc17b653 1477 "Failed to map data (%d)\n", err);
71102307
CH		 1478 nvme_cleanup_cmd(rq);
1479 goto err;
1480 }
1481
1482 ib_dma_sync_single_for_device(dev, sqe->dma,
1483 sizeof(struct nvme_command), DMA_TO_DEVICE);
1484
aebf526b 1485 if (req_op(rq) == REQ_OP_FLUSH)
71102307 1486 flush = true;
fc17b653 1487 err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
f5b7b559 1488 req->mr->need_inval ? &req->reg_wr.wr : NULL, flush);
fc17b653 1489 if (err) {
71102307
CH		 1490 nvme_rdma_unmap_data(queue, rq);
1491 goto err;
1492 }
1493
fc17b653 1494 return BLK_STS_OK;
71102307 1495err:
fc17b653
CH		 1496 if (err == -ENOMEM || err == -EAGAIN)
1497 return BLK_STS_RESOURCE;
1498 return BLK_STS_IOERR;
71102307
CH		 1499}
1500
1501static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
1502{
1503 struct nvme_rdma_queue *queue = hctx->driver_data;
1504 struct ib_cq *cq = queue->ib_cq;
1505 struct ib_wc wc;
1506 int found = 0;
1507
71102307
CH		 1508 while (ib_poll_cq(cq, 1, &wc) > 0) {
1509 struct ib_cqe *cqe = wc.wr_cqe;
1510
1511 if (cqe) {
1512 if (cqe->done == nvme_rdma_recv_done)
1513 found |= __nvme_rdma_recv_done(cq, &wc, tag);
1514 else
1515 cqe->done(cq, &wc);
1516 }
1517 }
1518
1519 return found;
1520}
1521
1522static void nvme_rdma_complete_rq(struct request *rq)
1523{
1524 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
71102307 1525
77f02a7a
CH		 1526 nvme_rdma_unmap_data(req->queue, rq);
1527 nvme_complete_rq(rq);
71102307
CH		 1528}
1529
f363b089 1530static const struct blk_mq_ops nvme_rdma_mq_ops = {
71102307
CH		 1531 .queue_rq = nvme_rdma_queue_rq,
1532 .complete = nvme_rdma_complete_rq,
71102307
CH		 1533 .init_request = nvme_rdma_init_request,
1534 .exit_request = nvme_rdma_exit_request,
1535 .reinit_request = nvme_rdma_reinit_request,
1536 .init_hctx = nvme_rdma_init_hctx,
1537 .poll = nvme_rdma_poll,
1538 .timeout = nvme_rdma_timeout,
1539};
1540
f363b089 1541static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
71102307
CH		 1542 .queue_rq = nvme_rdma_queue_rq,
1543 .complete = nvme_rdma_complete_rq,
71102307
CH		 1544 .init_request = nvme_rdma_init_admin_request,
1545 .exit_request = nvme_rdma_exit_admin_request,
1546 .reinit_request = nvme_rdma_reinit_request,
1547 .init_hctx = nvme_rdma_init_admin_hctx,
1548 .timeout = nvme_rdma_timeout,
1549};
1550
1551static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl)
1552{
1553 int error;
1554
1555 error = nvme_rdma_init_queue(ctrl, 0, NVMF_AQ_DEPTH);
1556 if (error)
1557 return error;
1558
1559 ctrl->device = ctrl->queues[0].device;
1560
1561 /*
1562 * We need a reference on the device as long as the tag_set is alive,
1563 * as the MRs in the request structures need a valid ib_device.
1564 */
1565 error = -EINVAL;
1566 if (!nvme_rdma_dev_get(ctrl->device))
1567 goto out_free_queue;
1568
1569 ctrl->max_fr_pages = min_t(u32, NVME_RDMA_MAX_SEGMENTS,
1570 ctrl->device->dev->attrs.max_fast_reg_page_list_len);
1571
1572 memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
1573 ctrl->admin_tag_set.ops = &nvme_rdma_admin_mq_ops;
1574 ctrl->admin_tag_set.queue_depth = NVME_RDMA_AQ_BLKMQ_DEPTH;
1575 ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */
1576 ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
1577 ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_rdma_request) +
1578 SG_CHUNK_SIZE * sizeof(struct scatterlist);
1579 ctrl->admin_tag_set.driver_data = ctrl;
1580 ctrl->admin_tag_set.nr_hw_queues = 1;
1581 ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
1582
1583 error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
1584 if (error)
1585 goto out_put_dev;
1586
1587 ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
1588 if (IS_ERR(ctrl->ctrl.admin_q)) {
1589 error = PTR_ERR(ctrl->ctrl.admin_q);
1590 goto out_free_tagset;
1591 }
1592
1593 error = nvmf_connect_admin_queue(&ctrl->ctrl);
1594 if (error)
1595 goto out_cleanup_queue;
1596
553cd9ef
CH		 1597 set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[0].flags);
1598
71102307
CH		 1599 error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->cap);
1600 if (error) {
1601 dev_err(ctrl->ctrl.device,
1602 "prop_get NVME_REG_CAP failed\n");
1603 goto out_cleanup_queue;
1604 }
1605
1606 ctrl->ctrl.sqsize =
1af76dda 1607 min_t(int, NVME_CAP_MQES(ctrl->cap), ctrl->ctrl.sqsize);
71102307
CH		 1608
1609 error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->cap);
1610 if (error)
1611 goto out_cleanup_queue;
1612
1613 ctrl->ctrl.max_hw_sectors =
1614 (ctrl->max_fr_pages - 1) << (PAGE_SHIFT - 9);
1615
1616 error = nvme_init_identify(&ctrl->ctrl);
1617 if (error)
1618 goto out_cleanup_queue;
1619
1620 error = nvme_rdma_alloc_qe(ctrl->queues[0].device->dev,
1621 &ctrl->async_event_sqe, sizeof(struct nvme_command),
1622 DMA_TO_DEVICE);
1623 if (error)
1624 goto out_cleanup_queue;
1625
1626 nvme_start_keep_alive(&ctrl->ctrl);
1627
1628 return 0;
1629
1630out_cleanup_queue:
1631 blk_cleanup_queue(ctrl->ctrl.admin_q);
1632out_free_tagset:
1633 /* disconnect and drain the queue before freeing the tagset */
1634 nvme_rdma_stop_queue(&ctrl->queues[0]);
1635 blk_mq_free_tag_set(&ctrl->admin_tag_set);
1636out_put_dev:
1637 nvme_rdma_dev_put(ctrl->device);
1638out_free_queue:
1639 nvme_rdma_free_queue(&ctrl->queues[0]);
1640 return error;
1641}
1642
1643static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl)
1644{
1645 nvme_stop_keep_alive(&ctrl->ctrl);
1646 cancel_work_sync(&ctrl->err_work);
1647 cancel_delayed_work_sync(&ctrl->reconnect_work);
1648
1649 if (ctrl->queue_count > 1) {
1650 nvme_stop_queues(&ctrl->ctrl);
1651 blk_mq_tagset_busy_iter(&ctrl->tag_set,
1652 nvme_cancel_request, &ctrl->ctrl);
1653 nvme_rdma_free_io_queues(ctrl);
1654 }
1655
b282a88d 1656 if (test_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[0].flags))
71102307
CH		 1657 nvme_shutdown_ctrl(&ctrl->ctrl);
1658
1659 blk_mq_stop_hw_queues(ctrl->ctrl.admin_q);
1660 blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
1661 nvme_cancel_request, &ctrl->ctrl);
1662 nvme_rdma_destroy_admin_queue(ctrl);
1663}
1664
2461a8dd
SG		 1665static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
1666{
1667 nvme_uninit_ctrl(&ctrl->ctrl);
1668 if (shutdown)
1669 nvme_rdma_shutdown_ctrl(ctrl);
a34ca17a
SG		 1670
1671 if (ctrl->ctrl.tagset) {
1672 blk_cleanup_queue(ctrl->ctrl.connect_q);
1673 blk_mq_free_tag_set(&ctrl->tag_set);
1674 nvme_rdma_dev_put(ctrl->device);
1675 }
1676
2461a8dd
SG		 1677 nvme_put_ctrl(&ctrl->ctrl);
1678}
1679
71102307
CH		 1680static void nvme_rdma_del_ctrl_work(struct work_struct *work)
1681{
1682 struct nvme_rdma_ctrl *ctrl = container_of(work,
1683 struct nvme_rdma_ctrl, delete_work);
1684
2461a8dd 1685 __nvme_rdma_remove_ctrl(ctrl, true);
71102307
CH		 1686}
1687
1688static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl)
1689{
1690 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
1691 return -EBUSY;
1692
9a6327d2 1693 if (!queue_work(nvme_wq, &ctrl->delete_work))
71102307
CH		 1694 return -EBUSY;
1695
1696 return 0;
1697}
1698
1699static int nvme_rdma_del_ctrl(struct nvme_ctrl *nctrl)
1700{
1701 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
cdbecc8d 1702 int ret = 0;
71102307 1703
cdbecc8d
SW		 1704 /*
1705 * Keep a reference until all work is flushed since
1706 * __nvme_rdma_del_ctrl can free the ctrl mem
1707 */
1708 if (!kref_get_unless_zero(&ctrl->ctrl.kref))
1709 return -EBUSY;
71102307 1710 ret = __nvme_rdma_del_ctrl(ctrl);
cdbecc8d
SW		 1711 if (!ret)
1712 flush_work(&ctrl->delete_work);
1713 nvme_put_ctrl(&ctrl->ctrl);
1714 return ret;
71102307
CH		 1715}
1716
1717static void nvme_rdma_remove_ctrl_work(struct work_struct *work)
1718{
1719 struct nvme_rdma_ctrl *ctrl = container_of(work,
1720 struct nvme_rdma_ctrl, delete_work);
1721
2461a8dd 1722 __nvme_rdma_remove_ctrl(ctrl, false);
71102307
CH		 1723}
1724
1725static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
1726{
1727 struct nvme_rdma_ctrl *ctrl = container_of(work,
1728 struct nvme_rdma_ctrl, reset_work);
1729 int ret;
1730 bool changed;
1731
1732 nvme_rdma_shutdown_ctrl(ctrl);
1733
1734 ret = nvme_rdma_configure_admin_queue(ctrl);
1735 if (ret) {
1736 /* ctrl is already shutdown, just remove the ctrl */
1737 INIT_WORK(&ctrl->delete_work, nvme_rdma_remove_ctrl_work);
1738 goto del_dead_ctrl;
1739 }
1740
1741 if (ctrl->queue_count > 1) {
1742 ret = blk_mq_reinit_tagset(&ctrl->tag_set);
1743 if (ret)
1744 goto del_dead_ctrl;
1745
1746 ret = nvme_rdma_init_io_queues(ctrl);
1747 if (ret)
1748 goto del_dead_ctrl;
1749
1750 ret = nvme_rdma_connect_io_queues(ctrl);
1751 if (ret)
1752 goto del_dead_ctrl;
1753 }
1754
1755 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
1756 WARN_ON_ONCE(!changed);
1757
1758 if (ctrl->queue_count > 1) {
1759 nvme_start_queues(&ctrl->ctrl);
1760 nvme_queue_scan(&ctrl->ctrl);
3ef1b4b2 1761 nvme_queue_async_events(&ctrl->ctrl);
71102307
CH		 1762 }
1763
1764 return;
1765
1766del_dead_ctrl:
1767 /* Deleting this dead controller... */
1768 dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
9a6327d2 1769 WARN_ON(!queue_work(nvme_wq, &ctrl->delete_work));
71102307
CH		 1770}
1771
1772static int nvme_rdma_reset_ctrl(struct nvme_ctrl *nctrl)
1773{
1774 struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
1775
1776 if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RESETTING))
1777 return -EBUSY;
1778
9a6327d2 1779 if (!queue_work(nvme_wq, &ctrl->reset_work))
71102307
CH		 1780 return -EBUSY;
1781
1782 flush_work(&ctrl->reset_work);
1783
1784 return 0;
1785}
1786
1787static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
1788 .name = "rdma",
1789 .module = THIS_MODULE,
d3d5b87d 1790 .flags = NVME_F_FABRICS,
71102307
CH		 1791 .reg_read32 = nvmf_reg_read32,
1792 .reg_read64 = nvmf_reg_read64,
1793 .reg_write32 = nvmf_reg_write32,
1794 .reset_ctrl = nvme_rdma_reset_ctrl,
1795 .free_ctrl = nvme_rdma_free_ctrl,
1796 .submit_async_event = nvme_rdma_submit_async_event,
1797 .delete_ctrl = nvme_rdma_del_ctrl,
1798 .get_subsysnqn = nvmf_get_subsysnqn,
1799 .get_address = nvmf_get_address,
1800};
1801
1802static int nvme_rdma_create_io_queues(struct nvme_rdma_ctrl *ctrl)
1803{
71102307
CH		 1804 int ret;
1805
71102307
CH		 1806 ret = nvme_rdma_init_io_queues(ctrl);
1807 if (ret)
1808 return ret;
1809
1810 /*
1811 * We need a reference on the device as long as the tag_set is alive,
1812 * as the MRs in the request structures need a valid ib_device.
1813 */
1814 ret = -EINVAL;
1815 if (!nvme_rdma_dev_get(ctrl->device))
1816 goto out_free_io_queues;
1817
1818 memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
1819 ctrl->tag_set.ops = &nvme_rdma_mq_ops;
c5af8654 1820 ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
71102307
CH		 1821 ctrl->tag_set.reserved_tags = 1; /* fabric connect */
1822 ctrl->tag_set.numa_node = NUMA_NO_NODE;
1823 ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
1824 ctrl->tag_set.cmd_size = sizeof(struct nvme_rdma_request) +
1825 SG_CHUNK_SIZE * sizeof(struct scatterlist);
1826 ctrl->tag_set.driver_data = ctrl;
1827 ctrl->tag_set.nr_hw_queues = ctrl->queue_count - 1;
1828 ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
1829
1830 ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
1831 if (ret)
1832 goto out_put_dev;
1833 ctrl->ctrl.tagset = &ctrl->tag_set;
1834
1835 ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
1836 if (IS_ERR(ctrl->ctrl.connect_q)) {
1837 ret = PTR_ERR(ctrl->ctrl.connect_q);
1838 goto out_free_tag_set;
1839 }
1840
1841 ret = nvme_rdma_connect_io_queues(ctrl);
1842 if (ret)
1843 goto out_cleanup_connect_q;
1844
1845 return 0;
1846
1847out_cleanup_connect_q:
1848 blk_cleanup_queue(ctrl->ctrl.connect_q);
1849out_free_tag_set:
1850 blk_mq_free_tag_set(&ctrl->tag_set);
1851out_put_dev:
1852 nvme_rdma_dev_put(ctrl->device);
1853out_free_io_queues:
1854 nvme_rdma_free_io_queues(ctrl);
1855 return ret;
1856}
1857
71102307
CH		 1858static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
1859 struct nvmf_ctrl_options *opts)
1860{
1861 struct nvme_rdma_ctrl *ctrl;
1862 int ret;
1863 bool changed;
0928f9b4 1864 char *port;
71102307
CH		 1865
1866 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
1867 if (!ctrl)
1868 return ERR_PTR(-ENOMEM);
1869 ctrl->ctrl.opts = opts;
1870 INIT_LIST_HEAD(&ctrl->list);
1871
0928f9b4
SG		 1872 if (opts->mask & NVMF_OPT_TRSVCID)
1873 port = opts->trsvcid;
1874 else
1875 port = __stringify(NVME_RDMA_IP_PORT);
1876
1877 ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
1878 opts->traddr, port, &ctrl->addr);
71102307 1879 if (ret) {
0928f9b4 1880 pr_err("malformed address passed: %s:%s\n", opts->traddr, port);
71102307
CH		 1881 goto out_free_ctrl;
1882 }
1883
8f4e8dac 1884 if (opts->mask & NVMF_OPT_HOST_TRADDR) {
0928f9b4
SG		 1885 ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
1886 opts->host_traddr, NULL, &ctrl->src_addr);
8f4e8dac 1887 if (ret) {
0928f9b4 1888 pr_err("malformed src address passed: %s\n",
8f4e8dac
MG		 1889 opts->host_traddr);
1890 goto out_free_ctrl;
1891 }
1892 }
1893
71102307
CH		 1894 ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
1895 0 /* no quirks, we're perfect! */);
1896 if (ret)
1897 goto out_free_ctrl;
1898
71102307
CH		 1899 INIT_DELAYED_WORK(&ctrl->reconnect_work,
1900 nvme_rdma_reconnect_ctrl_work);
1901 INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
1902 INIT_WORK(&ctrl->delete_work, nvme_rdma_del_ctrl_work);
1903 INIT_WORK(&ctrl->reset_work, nvme_rdma_reset_ctrl_work);
71102307
CH		 1904
1905 ctrl->queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */
c5af8654 1906 ctrl->ctrl.sqsize = opts->queue_size - 1;
71102307
CH		 1907 ctrl->ctrl.kato = opts->kato;
1908
1909 ret = -ENOMEM;
1910 ctrl->queues = kcalloc(ctrl->queue_count, sizeof(*ctrl->queues),
1911 GFP_KERNEL);
1912 if (!ctrl->queues)
1913 goto out_uninit_ctrl;
1914
1915 ret = nvme_rdma_configure_admin_queue(ctrl);
1916 if (ret)
1917 goto out_kfree_queues;
1918
1919 /* sanity check icdoff */
1920 if (ctrl->ctrl.icdoff) {
1921 dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
1922 goto out_remove_admin_queue;
1923 }
1924
1925 /* sanity check keyed sgls */
1926 if (!(ctrl->ctrl.sgls & (1 << 20))) {
1927 dev_err(ctrl->ctrl.device, "Mandatory keyed sgls are not support\n");
1928 goto out_remove_admin_queue;
1929 }
1930
1931 if (opts->queue_size > ctrl->ctrl.maxcmd) {
1932 /* warn if maxcmd is lower than queue_size */
1933 dev_warn(ctrl->ctrl.device,
1934 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
1935 opts->queue_size, ctrl->ctrl.maxcmd);
1936 opts->queue_size = ctrl->ctrl.maxcmd;
1937 }
1938
76c08bf4
SJ		 1939 if (opts->queue_size > ctrl->ctrl.sqsize + 1) {
1940 /* warn if sqsize is lower than queue_size */
1941 dev_warn(ctrl->ctrl.device,
1942 "queue_size %zu > ctrl sqsize %u, clamping down\n",
1943 opts->queue_size, ctrl->ctrl.sqsize + 1);
1944 opts->queue_size = ctrl->ctrl.sqsize + 1;
1945 }
1946
71102307
CH		 1947 if (opts->nr_io_queues) {
1948 ret = nvme_rdma_create_io_queues(ctrl);
1949 if (ret)
1950 goto out_remove_admin_queue;
1951 }
1952
1953 changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
1954 WARN_ON_ONCE(!changed);
1955
0928f9b4 1956 dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
71102307
CH		 1957 ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
1958
1959 kref_get(&ctrl->ctrl.kref);
1960
1961 mutex_lock(&nvme_rdma_ctrl_mutex);
1962 list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
1963 mutex_unlock(&nvme_rdma_ctrl_mutex);
1964
1965 if (opts->nr_io_queues) {
1966 nvme_queue_scan(&ctrl->ctrl);
1967 nvme_queue_async_events(&ctrl->ctrl);
1968 }
1969
1970 return &ctrl->ctrl;
1971
1972out_remove_admin_queue:
1973 nvme_stop_keep_alive(&ctrl->ctrl);
1974 nvme_rdma_destroy_admin_queue(ctrl);
1975out_kfree_queues:
1976 kfree(ctrl->queues);
1977out_uninit_ctrl:
1978 nvme_uninit_ctrl(&ctrl->ctrl);
1979 nvme_put_ctrl(&ctrl->ctrl);
1980 if (ret > 0)
1981 ret = -EIO;
1982 return ERR_PTR(ret);
1983out_free_ctrl:
1984 kfree(ctrl);
1985 return ERR_PTR(ret);
1986}
1987
1988static struct nvmf_transport_ops nvme_rdma_transport = {
1989 .name = "rdma",
1990 .required_opts = NVMF_OPT_TRADDR,
8f4e8dac 1991 .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
fd8563ce 1992 NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO,
71102307
CH		 1993 .create_ctrl = nvme_rdma_create_ctrl,
1994};
1995
e87a911f
SW		 1996static void nvme_rdma_add_one(struct ib_device *ib_device)
1997{
1998}
1999
2000static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
2001{
2002 struct nvme_rdma_ctrl *ctrl;
2003
2004 /* Delete all controllers using this device */
2005 mutex_lock(&nvme_rdma_ctrl_mutex);
2006 list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
2007 if (ctrl->device->dev != ib_device)
2008 continue;
2009 dev_info(ctrl->ctrl.device,
2010 "Removing ctrl: NQN \"%s\", addr %pISp\n",
2011 ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
2012 __nvme_rdma_del_ctrl(ctrl);
2013 }
2014 mutex_unlock(&nvme_rdma_ctrl_mutex);
2015
9a6327d2 2016 flush_workqueue(nvme_wq);
e87a911f
SW		 2017}
2018
2019static struct ib_client nvme_rdma_ib_client = {
2020 .name = "nvme_rdma",
2021 .add = nvme_rdma_add_one,
2022 .remove = nvme_rdma_remove_one
2023};
2024
71102307
CH		 2025static int __init nvme_rdma_init_module(void)
2026{
e87a911f
SW		 2027 int ret;
2028
e87a911f 2029 ret = ib_register_client(&nvme_rdma_ib_client);
a56c79cf 2030 if (ret)
9a6327d2 2031 return ret;
a56c79cf
SG		 2032
2033 ret = nvmf_register_transport(&nvme_rdma_transport);
2034 if (ret)
2035 goto err_unreg_client;
e87a911f 2036
a56c79cf 2037 return 0;
e87a911f 2038
a56c79cf
SG		 2039err_unreg_client:
2040 ib_unregister_client(&nvme_rdma_ib_client);
a56c79cf 2041 return ret;
71102307
CH		 2042}
2043
2044static void __exit nvme_rdma_cleanup_module(void)
2045{
71102307 2046 nvmf_unregister_transport(&nvme_rdma_transport);
e87a911f 2047 ib_unregister_client(&nvme_rdma_ib_client);
71102307
CH		 2048}
2049
2050module_init(nvme_rdma_init_module);
2051module_exit(nvme_rdma_cleanup_module);
2052
2053MODULE_LICENSE("GPL v2");
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