2 * NVMe over Fabrics RDMA host code.
3 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
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.
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
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
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>
27 #include <asm/unaligned.h>
29 #include <rdma/ib_verbs.h>
30 #include <rdma/rdma_cm.h>
31 #include <linux/nvme-rdma.h>
37 #define NVME_RDMA_CONNECT_TIMEOUT_MS 1000 /* 1 second */
39 #define NVME_RDMA_MAX_SEGMENT_SIZE 0xffffff /* 24-bit SGL field */
41 #define NVME_RDMA_MAX_SEGMENTS 256
43 #define NVME_RDMA_MAX_INLINE_SEGMENTS 1
46 * We handle AEN commands ourselves and don't even let the
47 * block layer know about them.
49 #define NVME_RDMA_NR_AEN_COMMANDS 1
50 #define NVME_RDMA_AQ_BLKMQ_DEPTH \
51 (NVMF_AQ_DEPTH - NVME_RDMA_NR_AEN_COMMANDS)
53 struct nvme_rdma_device
{
54 struct ib_device
*dev
;
57 struct list_head entry
;
66 struct nvme_rdma_queue
;
67 struct nvme_rdma_request
{
68 struct nvme_request req
;
70 struct nvme_rdma_qe sqe
;
71 struct ib_sge sge
[1 + NVME_RDMA_MAX_INLINE_SEGMENTS
];
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
[];
82 enum nvme_rdma_queue_flags
{
83 NVME_RDMA_Q_CONNECTED
= (1 << 0),
84 NVME_RDMA_IB_QUEUE_ALLOCATED
= (1 << 1),
85 NVME_RDMA_Q_DELETING
= (1 << 2),
86 NVME_RDMA_Q_LIVE
= (1 << 3),
89 struct nvme_rdma_queue
{
90 struct nvme_rdma_qe
*rsp_ring
;
93 size_t cmnd_capsule_len
;
94 struct nvme_rdma_ctrl
*ctrl
;
95 struct nvme_rdma_device
*device
;
100 struct rdma_cm_id
*cm_id
;
102 struct completion cm_done
;
105 struct nvme_rdma_ctrl
{
106 /* read and written in the hot path */
109 /* read only in the hot path */
110 struct nvme_rdma_queue
*queues
;
113 /* other member variables */
114 struct blk_mq_tag_set tag_set
;
115 struct work_struct delete_work
;
116 struct work_struct reset_work
;
117 struct work_struct err_work
;
119 struct nvme_rdma_qe async_event_sqe
;
122 struct delayed_work reconnect_work
;
124 struct list_head list
;
126 struct blk_mq_tag_set admin_tag_set
;
127 struct nvme_rdma_device
*device
;
133 struct sockaddr addr
;
134 struct sockaddr_in addr_in
;
137 struct sockaddr src_addr
;
138 struct sockaddr_in src_addr_in
;
141 struct nvme_ctrl ctrl
;
144 static inline struct nvme_rdma_ctrl
*to_rdma_ctrl(struct nvme_ctrl
*ctrl
)
146 return container_of(ctrl
, struct nvme_rdma_ctrl
, ctrl
);
149 static LIST_HEAD(device_list
);
150 static DEFINE_MUTEX(device_list_mutex
);
152 static LIST_HEAD(nvme_rdma_ctrl_list
);
153 static DEFINE_MUTEX(nvme_rdma_ctrl_mutex
);
155 static struct workqueue_struct
*nvme_rdma_wq
;
158 * Disabling this option makes small I/O goes faster, but is fundamentally
159 * unsafe. With it turned off we will have to register a global rkey that
160 * allows read and write access to all physical memory.
162 static bool register_always
= true;
163 module_param(register_always
, bool, 0444);
164 MODULE_PARM_DESC(register_always
,
165 "Use memory registration even for contiguous memory regions");
167 static int nvme_rdma_cm_handler(struct rdma_cm_id
*cm_id
,
168 struct rdma_cm_event
*event
);
169 static void nvme_rdma_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
);
171 /* XXX: really should move to a generic header sooner or later.. */
172 static inline void put_unaligned_le24(u32 val
, u8
*p
)
179 static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue
*queue
)
181 return queue
- queue
->ctrl
->queues
;
184 static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue
*queue
)
186 return queue
->cmnd_capsule_len
- sizeof(struct nvme_command
);
189 static void nvme_rdma_free_qe(struct ib_device
*ibdev
, struct nvme_rdma_qe
*qe
,
190 size_t capsule_size
, enum dma_data_direction dir
)
192 ib_dma_unmap_single(ibdev
, qe
->dma
, capsule_size
, dir
);
196 static int nvme_rdma_alloc_qe(struct ib_device
*ibdev
, struct nvme_rdma_qe
*qe
,
197 size_t capsule_size
, enum dma_data_direction dir
)
199 qe
->data
= kzalloc(capsule_size
, GFP_KERNEL
);
203 qe
->dma
= ib_dma_map_single(ibdev
, qe
->data
, capsule_size
, dir
);
204 if (ib_dma_mapping_error(ibdev
, qe
->dma
)) {
212 static void nvme_rdma_free_ring(struct ib_device
*ibdev
,
213 struct nvme_rdma_qe
*ring
, size_t ib_queue_size
,
214 size_t capsule_size
, enum dma_data_direction dir
)
218 for (i
= 0; i
< ib_queue_size
; i
++)
219 nvme_rdma_free_qe(ibdev
, &ring
[i
], capsule_size
, dir
);
223 static struct nvme_rdma_qe
*nvme_rdma_alloc_ring(struct ib_device
*ibdev
,
224 size_t ib_queue_size
, size_t capsule_size
,
225 enum dma_data_direction dir
)
227 struct nvme_rdma_qe
*ring
;
230 ring
= kcalloc(ib_queue_size
, sizeof(struct nvme_rdma_qe
), GFP_KERNEL
);
234 for (i
= 0; i
< ib_queue_size
; i
++) {
235 if (nvme_rdma_alloc_qe(ibdev
, &ring
[i
], capsule_size
, dir
))
242 nvme_rdma_free_ring(ibdev
, ring
, i
, capsule_size
, dir
);
246 static void nvme_rdma_qp_event(struct ib_event
*event
, void *context
)
248 pr_debug("QP event %s (%d)\n",
249 ib_event_msg(event
->event
), event
->event
);
253 static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue
*queue
)
255 wait_for_completion_interruptible_timeout(&queue
->cm_done
,
256 msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS
) + 1);
257 return queue
->cm_error
;
260 static int nvme_rdma_create_qp(struct nvme_rdma_queue
*queue
, const int factor
)
262 struct nvme_rdma_device
*dev
= queue
->device
;
263 struct ib_qp_init_attr init_attr
;
266 memset(&init_attr
, 0, sizeof(init_attr
));
267 init_attr
.event_handler
= nvme_rdma_qp_event
;
269 init_attr
.cap
.max_send_wr
= factor
* queue
->queue_size
+ 1;
271 init_attr
.cap
.max_recv_wr
= queue
->queue_size
+ 1;
272 init_attr
.cap
.max_recv_sge
= 1;
273 init_attr
.cap
.max_send_sge
= 1 + NVME_RDMA_MAX_INLINE_SEGMENTS
;
274 init_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
275 init_attr
.qp_type
= IB_QPT_RC
;
276 init_attr
.send_cq
= queue
->ib_cq
;
277 init_attr
.recv_cq
= queue
->ib_cq
;
279 ret
= rdma_create_qp(queue
->cm_id
, dev
->pd
, &init_attr
);
281 queue
->qp
= queue
->cm_id
->qp
;
285 static int nvme_rdma_reinit_request(void *data
, struct request
*rq
)
287 struct nvme_rdma_ctrl
*ctrl
= data
;
288 struct nvme_rdma_device
*dev
= ctrl
->device
;
289 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
292 if (!req
->mr
->need_inval
)
295 ib_dereg_mr(req
->mr
);
297 req
->mr
= ib_alloc_mr(dev
->pd
, IB_MR_TYPE_MEM_REG
,
299 if (IS_ERR(req
->mr
)) {
300 ret
= PTR_ERR(req
->mr
);
305 req
->mr
->need_inval
= false;
311 static void __nvme_rdma_exit_request(struct nvme_rdma_ctrl
*ctrl
,
312 struct request
*rq
, unsigned int queue_idx
)
314 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
315 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[queue_idx
];
316 struct nvme_rdma_device
*dev
= queue
->device
;
319 ib_dereg_mr(req
->mr
);
321 nvme_rdma_free_qe(dev
->dev
, &req
->sqe
, sizeof(struct nvme_command
),
325 static void nvme_rdma_exit_request(void *data
, struct request
*rq
,
326 unsigned int hctx_idx
, unsigned int rq_idx
)
328 return __nvme_rdma_exit_request(data
, rq
, hctx_idx
+ 1);
331 static void nvme_rdma_exit_admin_request(void *data
, struct request
*rq
,
332 unsigned int hctx_idx
, unsigned int rq_idx
)
334 return __nvme_rdma_exit_request(data
, rq
, 0);
337 static int __nvme_rdma_init_request(struct nvme_rdma_ctrl
*ctrl
,
338 struct request
*rq
, unsigned int queue_idx
)
340 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
341 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[queue_idx
];
342 struct nvme_rdma_device
*dev
= queue
->device
;
343 struct ib_device
*ibdev
= dev
->dev
;
346 ret
= nvme_rdma_alloc_qe(ibdev
, &req
->sqe
, sizeof(struct nvme_command
),
351 req
->mr
= ib_alloc_mr(dev
->pd
, IB_MR_TYPE_MEM_REG
,
353 if (IS_ERR(req
->mr
)) {
354 ret
= PTR_ERR(req
->mr
);
363 nvme_rdma_free_qe(dev
->dev
, &req
->sqe
, sizeof(struct nvme_command
),
368 static int nvme_rdma_init_request(void *data
, struct request
*rq
,
369 unsigned int hctx_idx
, unsigned int rq_idx
,
370 unsigned int numa_node
)
372 return __nvme_rdma_init_request(data
, rq
, hctx_idx
+ 1);
375 static int nvme_rdma_init_admin_request(void *data
, struct request
*rq
,
376 unsigned int hctx_idx
, unsigned int rq_idx
,
377 unsigned int numa_node
)
379 return __nvme_rdma_init_request(data
, rq
, 0);
382 static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
383 unsigned int hctx_idx
)
385 struct nvme_rdma_ctrl
*ctrl
= data
;
386 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[hctx_idx
+ 1];
388 BUG_ON(hctx_idx
>= ctrl
->queue_count
);
390 hctx
->driver_data
= queue
;
394 static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
395 unsigned int hctx_idx
)
397 struct nvme_rdma_ctrl
*ctrl
= data
;
398 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[0];
400 BUG_ON(hctx_idx
!= 0);
402 hctx
->driver_data
= queue
;
406 static void nvme_rdma_free_dev(struct kref
*ref
)
408 struct nvme_rdma_device
*ndev
=
409 container_of(ref
, struct nvme_rdma_device
, ref
);
411 mutex_lock(&device_list_mutex
);
412 list_del(&ndev
->entry
);
413 mutex_unlock(&device_list_mutex
);
415 ib_dealloc_pd(ndev
->pd
);
419 static void nvme_rdma_dev_put(struct nvme_rdma_device
*dev
)
421 kref_put(&dev
->ref
, nvme_rdma_free_dev
);
424 static int nvme_rdma_dev_get(struct nvme_rdma_device
*dev
)
426 return kref_get_unless_zero(&dev
->ref
);
429 static struct nvme_rdma_device
*
430 nvme_rdma_find_get_device(struct rdma_cm_id
*cm_id
)
432 struct nvme_rdma_device
*ndev
;
434 mutex_lock(&device_list_mutex
);
435 list_for_each_entry(ndev
, &device_list
, entry
) {
436 if (ndev
->dev
->node_guid
== cm_id
->device
->node_guid
&&
437 nvme_rdma_dev_get(ndev
))
441 ndev
= kzalloc(sizeof(*ndev
), GFP_KERNEL
);
445 ndev
->dev
= cm_id
->device
;
446 kref_init(&ndev
->ref
);
448 ndev
->pd
= ib_alloc_pd(ndev
->dev
,
449 register_always
? 0 : IB_PD_UNSAFE_GLOBAL_RKEY
);
450 if (IS_ERR(ndev
->pd
))
453 if (!(ndev
->dev
->attrs
.device_cap_flags
&
454 IB_DEVICE_MEM_MGT_EXTENSIONS
)) {
455 dev_err(&ndev
->dev
->dev
,
456 "Memory registrations not supported.\n");
460 list_add(&ndev
->entry
, &device_list
);
462 mutex_unlock(&device_list_mutex
);
466 ib_dealloc_pd(ndev
->pd
);
470 mutex_unlock(&device_list_mutex
);
474 static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue
*queue
)
476 struct nvme_rdma_device
*dev
;
477 struct ib_device
*ibdev
;
479 if (!test_and_clear_bit(NVME_RDMA_IB_QUEUE_ALLOCATED
, &queue
->flags
))
484 rdma_destroy_qp(queue
->cm_id
);
485 ib_free_cq(queue
->ib_cq
);
487 nvme_rdma_free_ring(ibdev
, queue
->rsp_ring
, queue
->queue_size
,
488 sizeof(struct nvme_completion
), DMA_FROM_DEVICE
);
490 nvme_rdma_dev_put(dev
);
493 static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue
*queue
,
494 struct nvme_rdma_device
*dev
)
496 struct ib_device
*ibdev
= dev
->dev
;
497 const int send_wr_factor
= 3; /* MR, SEND, INV */
498 const int cq_factor
= send_wr_factor
+ 1; /* + RECV */
499 int comp_vector
, idx
= nvme_rdma_queue_idx(queue
);
506 * The admin queue is barely used once the controller is live, so don't
507 * bother to spread it out.
512 comp_vector
= idx
% ibdev
->num_comp_vectors
;
515 /* +1 for ib_stop_cq */
516 queue
->ib_cq
= ib_alloc_cq(dev
->dev
, queue
,
517 cq_factor
* queue
->queue_size
+ 1, comp_vector
,
519 if (IS_ERR(queue
->ib_cq
)) {
520 ret
= PTR_ERR(queue
->ib_cq
);
524 ret
= nvme_rdma_create_qp(queue
, send_wr_factor
);
526 goto out_destroy_ib_cq
;
528 queue
->rsp_ring
= nvme_rdma_alloc_ring(ibdev
, queue
->queue_size
,
529 sizeof(struct nvme_completion
), DMA_FROM_DEVICE
);
530 if (!queue
->rsp_ring
) {
534 set_bit(NVME_RDMA_IB_QUEUE_ALLOCATED
, &queue
->flags
);
539 ib_destroy_qp(queue
->qp
);
541 ib_free_cq(queue
->ib_cq
);
546 static int nvme_rdma_init_queue(struct nvme_rdma_ctrl
*ctrl
,
547 int idx
, size_t queue_size
)
549 struct nvme_rdma_queue
*queue
;
550 struct sockaddr
*src_addr
= NULL
;
553 queue
= &ctrl
->queues
[idx
];
555 init_completion(&queue
->cm_done
);
558 queue
->cmnd_capsule_len
= ctrl
->ctrl
.ioccsz
* 16;
560 queue
->cmnd_capsule_len
= sizeof(struct nvme_command
);
562 queue
->queue_size
= queue_size
;
564 queue
->cm_id
= rdma_create_id(&init_net
, nvme_rdma_cm_handler
, queue
,
565 RDMA_PS_TCP
, IB_QPT_RC
);
566 if (IS_ERR(queue
->cm_id
)) {
567 dev_info(ctrl
->ctrl
.device
,
568 "failed to create CM ID: %ld\n", PTR_ERR(queue
->cm_id
));
569 return PTR_ERR(queue
->cm_id
);
572 queue
->cm_error
= -ETIMEDOUT
;
573 if (ctrl
->ctrl
.opts
->mask
& NVMF_OPT_HOST_TRADDR
)
574 src_addr
= &ctrl
->src_addr
;
576 ret
= rdma_resolve_addr(queue
->cm_id
, src_addr
, &ctrl
->addr
,
577 NVME_RDMA_CONNECT_TIMEOUT_MS
);
579 dev_info(ctrl
->ctrl
.device
,
580 "rdma_resolve_addr failed (%d).\n", ret
);
581 goto out_destroy_cm_id
;
584 ret
= nvme_rdma_wait_for_cm(queue
);
586 dev_info(ctrl
->ctrl
.device
,
587 "rdma_resolve_addr wait failed (%d).\n", ret
);
588 goto out_destroy_cm_id
;
591 clear_bit(NVME_RDMA_Q_DELETING
, &queue
->flags
);
592 set_bit(NVME_RDMA_Q_CONNECTED
, &queue
->flags
);
597 nvme_rdma_destroy_queue_ib(queue
);
598 rdma_destroy_id(queue
->cm_id
);
602 static void nvme_rdma_stop_queue(struct nvme_rdma_queue
*queue
)
604 rdma_disconnect(queue
->cm_id
);
605 ib_drain_qp(queue
->qp
);
608 static void nvme_rdma_free_queue(struct nvme_rdma_queue
*queue
)
610 nvme_rdma_destroy_queue_ib(queue
);
611 rdma_destroy_id(queue
->cm_id
);
614 static void nvme_rdma_stop_and_free_queue(struct nvme_rdma_queue
*queue
)
616 if (test_and_set_bit(NVME_RDMA_Q_DELETING
, &queue
->flags
))
618 nvme_rdma_stop_queue(queue
);
619 nvme_rdma_free_queue(queue
);
622 static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl
*ctrl
)
626 for (i
= 1; i
< ctrl
->queue_count
; i
++)
627 nvme_rdma_stop_and_free_queue(&ctrl
->queues
[i
]);
630 static int nvme_rdma_connect_io_queues(struct nvme_rdma_ctrl
*ctrl
)
634 for (i
= 1; i
< ctrl
->queue_count
; i
++) {
635 ret
= nvmf_connect_io_queue(&ctrl
->ctrl
, i
);
637 dev_info(ctrl
->ctrl
.device
,
638 "failed to connect i/o queue: %d\n", ret
);
639 goto out_free_queues
;
641 set_bit(NVME_RDMA_Q_LIVE
, &ctrl
->queues
[i
].flags
);
647 nvme_rdma_free_io_queues(ctrl
);
651 static int nvme_rdma_init_io_queues(struct nvme_rdma_ctrl
*ctrl
)
653 struct nvmf_ctrl_options
*opts
= ctrl
->ctrl
.opts
;
654 unsigned int nr_io_queues
;
657 nr_io_queues
= min(opts
->nr_io_queues
, num_online_cpus());
658 ret
= nvme_set_queue_count(&ctrl
->ctrl
, &nr_io_queues
);
662 ctrl
->queue_count
= nr_io_queues
+ 1;
663 if (ctrl
->queue_count
< 2)
666 dev_info(ctrl
->ctrl
.device
,
667 "creating %d I/O queues.\n", nr_io_queues
);
669 for (i
= 1; i
< ctrl
->queue_count
; i
++) {
670 ret
= nvme_rdma_init_queue(ctrl
, i
,
671 ctrl
->ctrl
.opts
->queue_size
);
673 dev_info(ctrl
->ctrl
.device
,
674 "failed to initialize i/o queue: %d\n", ret
);
675 goto out_free_queues
;
682 for (i
--; i
>= 1; i
--)
683 nvme_rdma_stop_and_free_queue(&ctrl
->queues
[i
]);
688 static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl
*ctrl
)
690 nvme_rdma_free_qe(ctrl
->queues
[0].device
->dev
, &ctrl
->async_event_sqe
,
691 sizeof(struct nvme_command
), DMA_TO_DEVICE
);
692 nvme_rdma_stop_and_free_queue(&ctrl
->queues
[0]);
693 blk_cleanup_queue(ctrl
->ctrl
.admin_q
);
694 blk_mq_free_tag_set(&ctrl
->admin_tag_set
);
695 nvme_rdma_dev_put(ctrl
->device
);
698 static void nvme_rdma_free_ctrl(struct nvme_ctrl
*nctrl
)
700 struct nvme_rdma_ctrl
*ctrl
= to_rdma_ctrl(nctrl
);
702 if (list_empty(&ctrl
->list
))
705 mutex_lock(&nvme_rdma_ctrl_mutex
);
706 list_del(&ctrl
->list
);
707 mutex_unlock(&nvme_rdma_ctrl_mutex
);
710 nvmf_free_options(nctrl
->opts
);
715 static void nvme_rdma_reconnect_ctrl_work(struct work_struct
*work
)
717 struct nvme_rdma_ctrl
*ctrl
= container_of(to_delayed_work(work
),
718 struct nvme_rdma_ctrl
, reconnect_work
);
722 if (ctrl
->queue_count
> 1) {
723 nvme_rdma_free_io_queues(ctrl
);
725 ret
= blk_mq_reinit_tagset(&ctrl
->tag_set
);
730 nvme_rdma_stop_and_free_queue(&ctrl
->queues
[0]);
732 ret
= blk_mq_reinit_tagset(&ctrl
->admin_tag_set
);
736 ret
= nvme_rdma_init_queue(ctrl
, 0, NVMF_AQ_DEPTH
);
740 blk_mq_start_stopped_hw_queues(ctrl
->ctrl
.admin_q
, true);
742 ret
= nvmf_connect_admin_queue(&ctrl
->ctrl
);
746 set_bit(NVME_RDMA_Q_LIVE
, &ctrl
->queues
[0].flags
);
748 ret
= nvme_enable_ctrl(&ctrl
->ctrl
, ctrl
->cap
);
752 nvme_start_keep_alive(&ctrl
->ctrl
);
754 if (ctrl
->queue_count
> 1) {
755 ret
= nvme_rdma_init_io_queues(ctrl
);
759 ret
= nvme_rdma_connect_io_queues(ctrl
);
764 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
765 WARN_ON_ONCE(!changed
);
767 if (ctrl
->queue_count
> 1) {
768 nvme_start_queues(&ctrl
->ctrl
);
769 nvme_queue_scan(&ctrl
->ctrl
);
770 nvme_queue_async_events(&ctrl
->ctrl
);
773 dev_info(ctrl
->ctrl
.device
, "Successfully reconnected\n");
778 blk_mq_stop_hw_queues(ctrl
->ctrl
.admin_q
);
780 /* Make sure we are not resetting/deleting */
781 if (ctrl
->ctrl
.state
== NVME_CTRL_RECONNECTING
) {
782 dev_info(ctrl
->ctrl
.device
,
783 "Failed reconnect attempt, requeueing...\n");
784 queue_delayed_work(nvme_rdma_wq
, &ctrl
->reconnect_work
,
785 ctrl
->reconnect_delay
* HZ
);
789 static void nvme_rdma_error_recovery_work(struct work_struct
*work
)
791 struct nvme_rdma_ctrl
*ctrl
= container_of(work
,
792 struct nvme_rdma_ctrl
, err_work
);
795 nvme_stop_keep_alive(&ctrl
->ctrl
);
797 for (i
= 0; i
< ctrl
->queue_count
; i
++) {
798 clear_bit(NVME_RDMA_Q_CONNECTED
, &ctrl
->queues
[i
].flags
);
799 clear_bit(NVME_RDMA_Q_LIVE
, &ctrl
->queues
[i
].flags
);
802 if (ctrl
->queue_count
> 1)
803 nvme_stop_queues(&ctrl
->ctrl
);
804 blk_mq_stop_hw_queues(ctrl
->ctrl
.admin_q
);
806 /* We must take care of fastfail/requeue all our inflight requests */
807 if (ctrl
->queue_count
> 1)
808 blk_mq_tagset_busy_iter(&ctrl
->tag_set
,
809 nvme_cancel_request
, &ctrl
->ctrl
);
810 blk_mq_tagset_busy_iter(&ctrl
->admin_tag_set
,
811 nvme_cancel_request
, &ctrl
->ctrl
);
813 dev_info(ctrl
->ctrl
.device
, "reconnecting in %d seconds\n",
814 ctrl
->reconnect_delay
);
816 queue_delayed_work(nvme_rdma_wq
, &ctrl
->reconnect_work
,
817 ctrl
->reconnect_delay
* HZ
);
820 static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl
*ctrl
)
822 if (!nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_RECONNECTING
))
825 queue_work(nvme_rdma_wq
, &ctrl
->err_work
);
828 static void nvme_rdma_wr_error(struct ib_cq
*cq
, struct ib_wc
*wc
,
831 struct nvme_rdma_queue
*queue
= cq
->cq_context
;
832 struct nvme_rdma_ctrl
*ctrl
= queue
->ctrl
;
834 if (ctrl
->ctrl
.state
== NVME_CTRL_LIVE
)
835 dev_info(ctrl
->ctrl
.device
,
836 "%s for CQE 0x%p failed with status %s (%d)\n",
838 ib_wc_status_msg(wc
->status
), wc
->status
);
839 nvme_rdma_error_recovery(ctrl
);
842 static void nvme_rdma_memreg_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
844 if (unlikely(wc
->status
!= IB_WC_SUCCESS
))
845 nvme_rdma_wr_error(cq
, wc
, "MEMREG");
848 static void nvme_rdma_inv_rkey_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
850 if (unlikely(wc
->status
!= IB_WC_SUCCESS
))
851 nvme_rdma_wr_error(cq
, wc
, "LOCAL_INV");
854 static int nvme_rdma_inv_rkey(struct nvme_rdma_queue
*queue
,
855 struct nvme_rdma_request
*req
)
857 struct ib_send_wr
*bad_wr
;
858 struct ib_send_wr wr
= {
859 .opcode
= IB_WR_LOCAL_INV
,
863 .ex
.invalidate_rkey
= req
->mr
->rkey
,
866 req
->reg_cqe
.done
= nvme_rdma_inv_rkey_done
;
867 wr
.wr_cqe
= &req
->reg_cqe
;
869 return ib_post_send(queue
->qp
, &wr
, &bad_wr
);
872 static void nvme_rdma_unmap_data(struct nvme_rdma_queue
*queue
,
875 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
876 struct nvme_rdma_ctrl
*ctrl
= queue
->ctrl
;
877 struct nvme_rdma_device
*dev
= queue
->device
;
878 struct ib_device
*ibdev
= dev
->dev
;
881 if (!blk_rq_bytes(rq
))
884 if (req
->mr
->need_inval
) {
885 res
= nvme_rdma_inv_rkey(queue
, req
);
887 dev_err(ctrl
->ctrl
.device
,
888 "Queueing INV WR for rkey %#x failed (%d)\n",
890 nvme_rdma_error_recovery(queue
->ctrl
);
894 ib_dma_unmap_sg(ibdev
, req
->sg_table
.sgl
,
895 req
->nents
, rq_data_dir(rq
) ==
896 WRITE
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
898 nvme_cleanup_cmd(rq
);
899 sg_free_table_chained(&req
->sg_table
, true);
902 static int nvme_rdma_set_sg_null(struct nvme_command
*c
)
904 struct nvme_keyed_sgl_desc
*sg
= &c
->common
.dptr
.ksgl
;
907 put_unaligned_le24(0, sg
->length
);
908 put_unaligned_le32(0, sg
->key
);
909 sg
->type
= NVME_KEY_SGL_FMT_DATA_DESC
<< 4;
913 static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue
*queue
,
914 struct nvme_rdma_request
*req
, struct nvme_command
*c
)
916 struct nvme_sgl_desc
*sg
= &c
->common
.dptr
.sgl
;
918 req
->sge
[1].addr
= sg_dma_address(req
->sg_table
.sgl
);
919 req
->sge
[1].length
= sg_dma_len(req
->sg_table
.sgl
);
920 req
->sge
[1].lkey
= queue
->device
->pd
->local_dma_lkey
;
922 sg
->addr
= cpu_to_le64(queue
->ctrl
->ctrl
.icdoff
);
923 sg
->length
= cpu_to_le32(sg_dma_len(req
->sg_table
.sgl
));
924 sg
->type
= (NVME_SGL_FMT_DATA_DESC
<< 4) | NVME_SGL_FMT_OFFSET
;
926 req
->inline_data
= true;
931 static int nvme_rdma_map_sg_single(struct nvme_rdma_queue
*queue
,
932 struct nvme_rdma_request
*req
, struct nvme_command
*c
)
934 struct nvme_keyed_sgl_desc
*sg
= &c
->common
.dptr
.ksgl
;
936 sg
->addr
= cpu_to_le64(sg_dma_address(req
->sg_table
.sgl
));
937 put_unaligned_le24(sg_dma_len(req
->sg_table
.sgl
), sg
->length
);
938 put_unaligned_le32(queue
->device
->pd
->unsafe_global_rkey
, sg
->key
);
939 sg
->type
= NVME_KEY_SGL_FMT_DATA_DESC
<< 4;
943 static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue
*queue
,
944 struct nvme_rdma_request
*req
, struct nvme_command
*c
,
947 struct nvme_keyed_sgl_desc
*sg
= &c
->common
.dptr
.ksgl
;
950 nr
= ib_map_mr_sg(req
->mr
, req
->sg_table
.sgl
, count
, NULL
, PAGE_SIZE
);
957 ib_update_fast_reg_key(req
->mr
, ib_inc_rkey(req
->mr
->rkey
));
959 req
->reg_cqe
.done
= nvme_rdma_memreg_done
;
960 memset(&req
->reg_wr
, 0, sizeof(req
->reg_wr
));
961 req
->reg_wr
.wr
.opcode
= IB_WR_REG_MR
;
962 req
->reg_wr
.wr
.wr_cqe
= &req
->reg_cqe
;
963 req
->reg_wr
.wr
.num_sge
= 0;
964 req
->reg_wr
.mr
= req
->mr
;
965 req
->reg_wr
.key
= req
->mr
->rkey
;
966 req
->reg_wr
.access
= IB_ACCESS_LOCAL_WRITE
|
967 IB_ACCESS_REMOTE_READ
|
968 IB_ACCESS_REMOTE_WRITE
;
970 req
->mr
->need_inval
= true;
972 sg
->addr
= cpu_to_le64(req
->mr
->iova
);
973 put_unaligned_le24(req
->mr
->length
, sg
->length
);
974 put_unaligned_le32(req
->mr
->rkey
, sg
->key
);
975 sg
->type
= (NVME_KEY_SGL_FMT_DATA_DESC
<< 4) |
976 NVME_SGL_FMT_INVALIDATE
;
981 static int nvme_rdma_map_data(struct nvme_rdma_queue
*queue
,
982 struct request
*rq
, struct nvme_command
*c
)
984 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
985 struct nvme_rdma_device
*dev
= queue
->device
;
986 struct ib_device
*ibdev
= dev
->dev
;
990 req
->inline_data
= false;
991 req
->mr
->need_inval
= false;
993 c
->common
.flags
|= NVME_CMD_SGL_METABUF
;
995 if (!blk_rq_bytes(rq
))
996 return nvme_rdma_set_sg_null(c
);
998 req
->sg_table
.sgl
= req
->first_sgl
;
999 ret
= sg_alloc_table_chained(&req
->sg_table
,
1000 blk_rq_nr_phys_segments(rq
), req
->sg_table
.sgl
);
1004 req
->nents
= blk_rq_map_sg(rq
->q
, rq
, req
->sg_table
.sgl
);
1006 count
= ib_dma_map_sg(ibdev
, req
->sg_table
.sgl
, req
->nents
,
1007 rq_data_dir(rq
) == WRITE
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1008 if (unlikely(count
<= 0)) {
1009 sg_free_table_chained(&req
->sg_table
, true);
1014 if (rq_data_dir(rq
) == WRITE
&& nvme_rdma_queue_idx(queue
) &&
1015 blk_rq_payload_bytes(rq
) <=
1016 nvme_rdma_inline_data_size(queue
))
1017 return nvme_rdma_map_sg_inline(queue
, req
, c
);
1019 if (dev
->pd
->flags
& IB_PD_UNSAFE_GLOBAL_RKEY
)
1020 return nvme_rdma_map_sg_single(queue
, req
, c
);
1023 return nvme_rdma_map_sg_fr(queue
, req
, c
, count
);
1026 static void nvme_rdma_send_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1028 if (unlikely(wc
->status
!= IB_WC_SUCCESS
))
1029 nvme_rdma_wr_error(cq
, wc
, "SEND");
1032 static int nvme_rdma_post_send(struct nvme_rdma_queue
*queue
,
1033 struct nvme_rdma_qe
*qe
, struct ib_sge
*sge
, u32 num_sge
,
1034 struct ib_send_wr
*first
, bool flush
)
1036 struct ib_send_wr wr
, *bad_wr
;
1039 sge
->addr
= qe
->dma
;
1040 sge
->length
= sizeof(struct nvme_command
),
1041 sge
->lkey
= queue
->device
->pd
->local_dma_lkey
;
1043 qe
->cqe
.done
= nvme_rdma_send_done
;
1046 wr
.wr_cqe
= &qe
->cqe
;
1048 wr
.num_sge
= num_sge
;
1049 wr
.opcode
= IB_WR_SEND
;
1053 * Unsignalled send completions are another giant desaster in the
1054 * IB Verbs spec: If we don't regularly post signalled sends
1055 * the send queue will fill up and only a QP reset will rescue us.
1056 * Would have been way to obvious to handle this in hardware or
1057 * at least the RDMA stack..
1059 * This messy and racy code sniplet is copy and pasted from the iSER
1060 * initiator, and the magic '32' comes from there as well.
1062 * Always signal the flushes. The magic request used for the flush
1063 * sequencer is not allocated in our driver's tagset and it's
1064 * triggered to be freed by blk_cleanup_queue(). So we need to
1065 * always mark it as signaled to ensure that the "wr_cqe", which is
1066 * embedded in request's payload, is not freed when __ib_process_cq()
1067 * calls wr_cqe->done().
1069 if ((++queue
->sig_count
% 32) == 0 || flush
)
1070 wr
.send_flags
|= IB_SEND_SIGNALED
;
1077 ret
= ib_post_send(queue
->qp
, first
, &bad_wr
);
1079 dev_err(queue
->ctrl
->ctrl
.device
,
1080 "%s failed with error code %d\n", __func__
, ret
);
1085 static int nvme_rdma_post_recv(struct nvme_rdma_queue
*queue
,
1086 struct nvme_rdma_qe
*qe
)
1088 struct ib_recv_wr wr
, *bad_wr
;
1092 list
.addr
= qe
->dma
;
1093 list
.length
= sizeof(struct nvme_completion
);
1094 list
.lkey
= queue
->device
->pd
->local_dma_lkey
;
1096 qe
->cqe
.done
= nvme_rdma_recv_done
;
1099 wr
.wr_cqe
= &qe
->cqe
;
1103 ret
= ib_post_recv(queue
->qp
, &wr
, &bad_wr
);
1105 dev_err(queue
->ctrl
->ctrl
.device
,
1106 "%s failed with error code %d\n", __func__
, ret
);
1111 static struct blk_mq_tags
*nvme_rdma_tagset(struct nvme_rdma_queue
*queue
)
1113 u32 queue_idx
= nvme_rdma_queue_idx(queue
);
1116 return queue
->ctrl
->admin_tag_set
.tags
[queue_idx
];
1117 return queue
->ctrl
->tag_set
.tags
[queue_idx
- 1];
1120 static void nvme_rdma_submit_async_event(struct nvme_ctrl
*arg
, int aer_idx
)
1122 struct nvme_rdma_ctrl
*ctrl
= to_rdma_ctrl(arg
);
1123 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[0];
1124 struct ib_device
*dev
= queue
->device
->dev
;
1125 struct nvme_rdma_qe
*sqe
= &ctrl
->async_event_sqe
;
1126 struct nvme_command
*cmd
= sqe
->data
;
1130 if (WARN_ON_ONCE(aer_idx
!= 0))
1133 ib_dma_sync_single_for_cpu(dev
, sqe
->dma
, sizeof(*cmd
), DMA_TO_DEVICE
);
1135 memset(cmd
, 0, sizeof(*cmd
));
1136 cmd
->common
.opcode
= nvme_admin_async_event
;
1137 cmd
->common
.command_id
= NVME_RDMA_AQ_BLKMQ_DEPTH
;
1138 cmd
->common
.flags
|= NVME_CMD_SGL_METABUF
;
1139 nvme_rdma_set_sg_null(cmd
);
1141 ib_dma_sync_single_for_device(dev
, sqe
->dma
, sizeof(*cmd
),
1144 ret
= nvme_rdma_post_send(queue
, sqe
, &sge
, 1, NULL
, false);
1148 static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue
*queue
,
1149 struct nvme_completion
*cqe
, struct ib_wc
*wc
, int tag
)
1152 struct nvme_rdma_request
*req
;
1155 rq
= blk_mq_tag_to_rq(nvme_rdma_tagset(queue
), cqe
->command_id
);
1157 dev_err(queue
->ctrl
->ctrl
.device
,
1158 "tag 0x%x on QP %#x not found\n",
1159 cqe
->command_id
, queue
->qp
->qp_num
);
1160 nvme_rdma_error_recovery(queue
->ctrl
);
1163 req
= blk_mq_rq_to_pdu(rq
);
1168 if ((wc
->wc_flags
& IB_WC_WITH_INVALIDATE
) &&
1169 wc
->ex
.invalidate_rkey
== req
->mr
->rkey
)
1170 req
->mr
->need_inval
= false;
1172 req
->req
.result
= cqe
->result
;
1173 blk_mq_complete_request(rq
, le16_to_cpu(cqe
->status
) >> 1);
1177 static int __nvme_rdma_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
, int tag
)
1179 struct nvme_rdma_qe
*qe
=
1180 container_of(wc
->wr_cqe
, struct nvme_rdma_qe
, cqe
);
1181 struct nvme_rdma_queue
*queue
= cq
->cq_context
;
1182 struct ib_device
*ibdev
= queue
->device
->dev
;
1183 struct nvme_completion
*cqe
= qe
->data
;
1184 const size_t len
= sizeof(struct nvme_completion
);
1187 if (unlikely(wc
->status
!= IB_WC_SUCCESS
)) {
1188 nvme_rdma_wr_error(cq
, wc
, "RECV");
1192 ib_dma_sync_single_for_cpu(ibdev
, qe
->dma
, len
, DMA_FROM_DEVICE
);
1194 * AEN requests are special as they don't time out and can
1195 * survive any kind of queue freeze and often don't respond to
1196 * aborts. We don't even bother to allocate a struct request
1197 * for them but rather special case them here.
1199 if (unlikely(nvme_rdma_queue_idx(queue
) == 0 &&
1200 cqe
->command_id
>= NVME_RDMA_AQ_BLKMQ_DEPTH
))
1201 nvme_complete_async_event(&queue
->ctrl
->ctrl
, cqe
->status
,
1204 ret
= nvme_rdma_process_nvme_rsp(queue
, cqe
, wc
, tag
);
1205 ib_dma_sync_single_for_device(ibdev
, qe
->dma
, len
, DMA_FROM_DEVICE
);
1207 nvme_rdma_post_recv(queue
, qe
);
1211 static void nvme_rdma_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1213 __nvme_rdma_recv_done(cq
, wc
, -1);
1216 static int nvme_rdma_conn_established(struct nvme_rdma_queue
*queue
)
1220 for (i
= 0; i
< queue
->queue_size
; i
++) {
1221 ret
= nvme_rdma_post_recv(queue
, &queue
->rsp_ring
[i
]);
1223 goto out_destroy_queue_ib
;
1228 out_destroy_queue_ib
:
1229 nvme_rdma_destroy_queue_ib(queue
);
1233 static int nvme_rdma_conn_rejected(struct nvme_rdma_queue
*queue
,
1234 struct rdma_cm_event
*ev
)
1236 struct rdma_cm_id
*cm_id
= queue
->cm_id
;
1237 int status
= ev
->status
;
1238 const char *rej_msg
;
1239 const struct nvme_rdma_cm_rej
*rej_data
;
1242 rej_msg
= rdma_reject_msg(cm_id
, status
);
1243 rej_data
= rdma_consumer_reject_data(cm_id
, ev
, &rej_data_len
);
1245 if (rej_data
&& rej_data_len
>= sizeof(u16
)) {
1246 u16 sts
= le16_to_cpu(rej_data
->sts
);
1248 dev_err(queue
->ctrl
->ctrl
.device
,
1249 "Connect rejected: status %d (%s) nvme status %d (%s).\n",
1250 status
, rej_msg
, sts
, nvme_rdma_cm_msg(sts
));
1252 dev_err(queue
->ctrl
->ctrl
.device
,
1253 "Connect rejected: status %d (%s).\n", status
, rej_msg
);
1259 static int nvme_rdma_addr_resolved(struct nvme_rdma_queue
*queue
)
1261 struct nvme_rdma_device
*dev
;
1264 dev
= nvme_rdma_find_get_device(queue
->cm_id
);
1266 dev_err(queue
->cm_id
->device
->dev
.parent
,
1267 "no client data found!\n");
1268 return -ECONNREFUSED
;
1271 ret
= nvme_rdma_create_queue_ib(queue
, dev
);
1273 nvme_rdma_dev_put(dev
);
1277 ret
= rdma_resolve_route(queue
->cm_id
, NVME_RDMA_CONNECT_TIMEOUT_MS
);
1279 dev_err(queue
->ctrl
->ctrl
.device
,
1280 "rdma_resolve_route failed (%d).\n",
1282 goto out_destroy_queue
;
1288 nvme_rdma_destroy_queue_ib(queue
);
1293 static int nvme_rdma_route_resolved(struct nvme_rdma_queue
*queue
)
1295 struct nvme_rdma_ctrl
*ctrl
= queue
->ctrl
;
1296 struct rdma_conn_param param
= { };
1297 struct nvme_rdma_cm_req priv
= { };
1300 param
.qp_num
= queue
->qp
->qp_num
;
1301 param
.flow_control
= 1;
1303 param
.responder_resources
= queue
->device
->dev
->attrs
.max_qp_rd_atom
;
1304 /* maximum retry count */
1305 param
.retry_count
= 7;
1306 param
.rnr_retry_count
= 7;
1307 param
.private_data
= &priv
;
1308 param
.private_data_len
= sizeof(priv
);
1310 priv
.recfmt
= cpu_to_le16(NVME_RDMA_CM_FMT_1_0
);
1311 priv
.qid
= cpu_to_le16(nvme_rdma_queue_idx(queue
));
1313 * set the admin queue depth to the minimum size
1314 * specified by the Fabrics standard.
1316 if (priv
.qid
== 0) {
1317 priv
.hrqsize
= cpu_to_le16(NVMF_AQ_DEPTH
);
1318 priv
.hsqsize
= cpu_to_le16(NVMF_AQ_DEPTH
- 1);
1321 * current interpretation of the fabrics spec
1322 * is at minimum you make hrqsize sqsize+1, or a
1323 * 1's based representation of sqsize.
1325 priv
.hrqsize
= cpu_to_le16(queue
->queue_size
);
1326 priv
.hsqsize
= cpu_to_le16(queue
->ctrl
->ctrl
.sqsize
);
1329 ret
= rdma_connect(queue
->cm_id
, ¶m
);
1331 dev_err(ctrl
->ctrl
.device
,
1332 "rdma_connect failed (%d).\n", ret
);
1333 goto out_destroy_queue_ib
;
1338 out_destroy_queue_ib
:
1339 nvme_rdma_destroy_queue_ib(queue
);
1343 static int nvme_rdma_cm_handler(struct rdma_cm_id
*cm_id
,
1344 struct rdma_cm_event
*ev
)
1346 struct nvme_rdma_queue
*queue
= cm_id
->context
;
1349 dev_dbg(queue
->ctrl
->ctrl
.device
, "%s (%d): status %d id %p\n",
1350 rdma_event_msg(ev
->event
), ev
->event
,
1353 switch (ev
->event
) {
1354 case RDMA_CM_EVENT_ADDR_RESOLVED
:
1355 cm_error
= nvme_rdma_addr_resolved(queue
);
1357 case RDMA_CM_EVENT_ROUTE_RESOLVED
:
1358 cm_error
= nvme_rdma_route_resolved(queue
);
1360 case RDMA_CM_EVENT_ESTABLISHED
:
1361 queue
->cm_error
= nvme_rdma_conn_established(queue
);
1362 /* complete cm_done regardless of success/failure */
1363 complete(&queue
->cm_done
);
1365 case RDMA_CM_EVENT_REJECTED
:
1366 cm_error
= nvme_rdma_conn_rejected(queue
, ev
);
1368 case RDMA_CM_EVENT_ADDR_ERROR
:
1369 case RDMA_CM_EVENT_ROUTE_ERROR
:
1370 case RDMA_CM_EVENT_CONNECT_ERROR
:
1371 case RDMA_CM_EVENT_UNREACHABLE
:
1372 dev_dbg(queue
->ctrl
->ctrl
.device
,
1373 "CM error event %d\n", ev
->event
);
1374 cm_error
= -ECONNRESET
;
1376 case RDMA_CM_EVENT_DISCONNECTED
:
1377 case RDMA_CM_EVENT_ADDR_CHANGE
:
1378 case RDMA_CM_EVENT_TIMEWAIT_EXIT
:
1379 dev_dbg(queue
->ctrl
->ctrl
.device
,
1380 "disconnect received - connection closed\n");
1381 nvme_rdma_error_recovery(queue
->ctrl
);
1383 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
1384 /* device removal is handled via the ib_client API */
1387 dev_err(queue
->ctrl
->ctrl
.device
,
1388 "Unexpected RDMA CM event (%d)\n", ev
->event
);
1389 nvme_rdma_error_recovery(queue
->ctrl
);
1394 queue
->cm_error
= cm_error
;
1395 complete(&queue
->cm_done
);
1401 static enum blk_eh_timer_return
1402 nvme_rdma_timeout(struct request
*rq
, bool reserved
)
1404 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
1406 /* queue error recovery */
1407 nvme_rdma_error_recovery(req
->queue
->ctrl
);
1409 /* fail with DNR on cmd timeout */
1410 rq
->errors
= NVME_SC_ABORT_REQ
| NVME_SC_DNR
;
1412 return BLK_EH_HANDLED
;
1416 * We cannot accept any other command until the Connect command has completed.
1418 static inline bool nvme_rdma_queue_is_ready(struct nvme_rdma_queue
*queue
,
1421 if (unlikely(!test_bit(NVME_RDMA_Q_LIVE
, &queue
->flags
))) {
1422 struct nvme_command
*cmd
= nvme_req(rq
)->cmd
;
1424 if (!blk_rq_is_passthrough(rq
) ||
1425 cmd
->common
.opcode
!= nvme_fabrics_command
||
1426 cmd
->fabrics
.fctype
!= nvme_fabrics_type_connect
)
1433 static int nvme_rdma_queue_rq(struct blk_mq_hw_ctx
*hctx
,
1434 const struct blk_mq_queue_data
*bd
)
1436 struct nvme_ns
*ns
= hctx
->queue
->queuedata
;
1437 struct nvme_rdma_queue
*queue
= hctx
->driver_data
;
1438 struct request
*rq
= bd
->rq
;
1439 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
1440 struct nvme_rdma_qe
*sqe
= &req
->sqe
;
1441 struct nvme_command
*c
= sqe
->data
;
1443 struct ib_device
*dev
;
1446 WARN_ON_ONCE(rq
->tag
< 0);
1448 if (!nvme_rdma_queue_is_ready(queue
, rq
))
1449 return BLK_MQ_RQ_QUEUE_BUSY
;
1451 dev
= queue
->device
->dev
;
1452 ib_dma_sync_single_for_cpu(dev
, sqe
->dma
,
1453 sizeof(struct nvme_command
), DMA_TO_DEVICE
);
1455 ret
= nvme_setup_cmd(ns
, rq
, c
);
1456 if (ret
!= BLK_MQ_RQ_QUEUE_OK
)
1459 blk_mq_start_request(rq
);
1461 ret
= nvme_rdma_map_data(queue
, rq
, c
);
1463 dev_err(queue
->ctrl
->ctrl
.device
,
1464 "Failed to map data (%d)\n", ret
);
1465 nvme_cleanup_cmd(rq
);
1469 ib_dma_sync_single_for_device(dev
, sqe
->dma
,
1470 sizeof(struct nvme_command
), DMA_TO_DEVICE
);
1472 if (req_op(rq
) == REQ_OP_FLUSH
)
1474 ret
= nvme_rdma_post_send(queue
, sqe
, req
->sge
, req
->num_sge
,
1475 req
->mr
->need_inval
? &req
->reg_wr
.wr
: NULL
, flush
);
1477 nvme_rdma_unmap_data(queue
, rq
);
1481 return BLK_MQ_RQ_QUEUE_OK
;
1483 return (ret
== -ENOMEM
|| ret
== -EAGAIN
) ?
1484 BLK_MQ_RQ_QUEUE_BUSY
: BLK_MQ_RQ_QUEUE_ERROR
;
1487 static int nvme_rdma_poll(struct blk_mq_hw_ctx
*hctx
, unsigned int tag
)
1489 struct nvme_rdma_queue
*queue
= hctx
->driver_data
;
1490 struct ib_cq
*cq
= queue
->ib_cq
;
1494 ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
1495 while (ib_poll_cq(cq
, 1, &wc
) > 0) {
1496 struct ib_cqe
*cqe
= wc
.wr_cqe
;
1499 if (cqe
->done
== nvme_rdma_recv_done
)
1500 found
|= __nvme_rdma_recv_done(cq
, &wc
, tag
);
1509 static void nvme_rdma_complete_rq(struct request
*rq
)
1511 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
1512 struct nvme_rdma_queue
*queue
= req
->queue
;
1515 nvme_rdma_unmap_data(queue
, rq
);
1517 if (unlikely(rq
->errors
)) {
1518 if (nvme_req_needs_retry(rq
, rq
->errors
)) {
1519 nvme_requeue_req(rq
);
1523 if (blk_rq_is_passthrough(rq
))
1526 error
= nvme_error_status(rq
->errors
);
1529 blk_mq_end_request(rq
, error
);
1532 static struct blk_mq_ops nvme_rdma_mq_ops
= {
1533 .queue_rq
= nvme_rdma_queue_rq
,
1534 .complete
= nvme_rdma_complete_rq
,
1535 .init_request
= nvme_rdma_init_request
,
1536 .exit_request
= nvme_rdma_exit_request
,
1537 .reinit_request
= nvme_rdma_reinit_request
,
1538 .init_hctx
= nvme_rdma_init_hctx
,
1539 .poll
= nvme_rdma_poll
,
1540 .timeout
= nvme_rdma_timeout
,
1543 static struct blk_mq_ops nvme_rdma_admin_mq_ops
= {
1544 .queue_rq
= nvme_rdma_queue_rq
,
1545 .complete
= nvme_rdma_complete_rq
,
1546 .init_request
= nvme_rdma_init_admin_request
,
1547 .exit_request
= nvme_rdma_exit_admin_request
,
1548 .reinit_request
= nvme_rdma_reinit_request
,
1549 .init_hctx
= nvme_rdma_init_admin_hctx
,
1550 .timeout
= nvme_rdma_timeout
,
1553 static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl
*ctrl
)
1557 error
= nvme_rdma_init_queue(ctrl
, 0, NVMF_AQ_DEPTH
);
1561 ctrl
->device
= ctrl
->queues
[0].device
;
1564 * We need a reference on the device as long as the tag_set is alive,
1565 * as the MRs in the request structures need a valid ib_device.
1568 if (!nvme_rdma_dev_get(ctrl
->device
))
1569 goto out_free_queue
;
1571 ctrl
->max_fr_pages
= min_t(u32
, NVME_RDMA_MAX_SEGMENTS
,
1572 ctrl
->device
->dev
->attrs
.max_fast_reg_page_list_len
);
1574 memset(&ctrl
->admin_tag_set
, 0, sizeof(ctrl
->admin_tag_set
));
1575 ctrl
->admin_tag_set
.ops
= &nvme_rdma_admin_mq_ops
;
1576 ctrl
->admin_tag_set
.queue_depth
= NVME_RDMA_AQ_BLKMQ_DEPTH
;
1577 ctrl
->admin_tag_set
.reserved_tags
= 2; /* connect + keep-alive */
1578 ctrl
->admin_tag_set
.numa_node
= NUMA_NO_NODE
;
1579 ctrl
->admin_tag_set
.cmd_size
= sizeof(struct nvme_rdma_request
) +
1580 SG_CHUNK_SIZE
* sizeof(struct scatterlist
);
1581 ctrl
->admin_tag_set
.driver_data
= ctrl
;
1582 ctrl
->admin_tag_set
.nr_hw_queues
= 1;
1583 ctrl
->admin_tag_set
.timeout
= ADMIN_TIMEOUT
;
1585 error
= blk_mq_alloc_tag_set(&ctrl
->admin_tag_set
);
1589 ctrl
->ctrl
.admin_q
= blk_mq_init_queue(&ctrl
->admin_tag_set
);
1590 if (IS_ERR(ctrl
->ctrl
.admin_q
)) {
1591 error
= PTR_ERR(ctrl
->ctrl
.admin_q
);
1592 goto out_free_tagset
;
1595 error
= nvmf_connect_admin_queue(&ctrl
->ctrl
);
1597 goto out_cleanup_queue
;
1599 set_bit(NVME_RDMA_Q_LIVE
, &ctrl
->queues
[0].flags
);
1601 error
= nvmf_reg_read64(&ctrl
->ctrl
, NVME_REG_CAP
, &ctrl
->cap
);
1603 dev_err(ctrl
->ctrl
.device
,
1604 "prop_get NVME_REG_CAP failed\n");
1605 goto out_cleanup_queue
;
1609 min_t(int, NVME_CAP_MQES(ctrl
->cap
), ctrl
->ctrl
.sqsize
);
1611 error
= nvme_enable_ctrl(&ctrl
->ctrl
, ctrl
->cap
);
1613 goto out_cleanup_queue
;
1615 ctrl
->ctrl
.max_hw_sectors
=
1616 (ctrl
->max_fr_pages
- 1) << (PAGE_SHIFT
- 9);
1618 error
= nvme_init_identify(&ctrl
->ctrl
);
1620 goto out_cleanup_queue
;
1622 error
= nvme_rdma_alloc_qe(ctrl
->queues
[0].device
->dev
,
1623 &ctrl
->async_event_sqe
, sizeof(struct nvme_command
),
1626 goto out_cleanup_queue
;
1628 nvme_start_keep_alive(&ctrl
->ctrl
);
1633 blk_cleanup_queue(ctrl
->ctrl
.admin_q
);
1635 /* disconnect and drain the queue before freeing the tagset */
1636 nvme_rdma_stop_queue(&ctrl
->queues
[0]);
1637 blk_mq_free_tag_set(&ctrl
->admin_tag_set
);
1639 nvme_rdma_dev_put(ctrl
->device
);
1641 nvme_rdma_free_queue(&ctrl
->queues
[0]);
1645 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl
*ctrl
)
1647 nvme_stop_keep_alive(&ctrl
->ctrl
);
1648 cancel_work_sync(&ctrl
->err_work
);
1649 cancel_delayed_work_sync(&ctrl
->reconnect_work
);
1651 if (ctrl
->queue_count
> 1) {
1652 nvme_stop_queues(&ctrl
->ctrl
);
1653 blk_mq_tagset_busy_iter(&ctrl
->tag_set
,
1654 nvme_cancel_request
, &ctrl
->ctrl
);
1655 nvme_rdma_free_io_queues(ctrl
);
1658 if (test_bit(NVME_RDMA_Q_CONNECTED
, &ctrl
->queues
[0].flags
))
1659 nvme_shutdown_ctrl(&ctrl
->ctrl
);
1661 blk_mq_stop_hw_queues(ctrl
->ctrl
.admin_q
);
1662 blk_mq_tagset_busy_iter(&ctrl
->admin_tag_set
,
1663 nvme_cancel_request
, &ctrl
->ctrl
);
1664 nvme_rdma_destroy_admin_queue(ctrl
);
1667 static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl
*ctrl
, bool shutdown
)
1669 nvme_uninit_ctrl(&ctrl
->ctrl
);
1671 nvme_rdma_shutdown_ctrl(ctrl
);
1673 if (ctrl
->ctrl
.tagset
) {
1674 blk_cleanup_queue(ctrl
->ctrl
.connect_q
);
1675 blk_mq_free_tag_set(&ctrl
->tag_set
);
1676 nvme_rdma_dev_put(ctrl
->device
);
1679 nvme_put_ctrl(&ctrl
->ctrl
);
1682 static void nvme_rdma_del_ctrl_work(struct work_struct
*work
)
1684 struct nvme_rdma_ctrl
*ctrl
= container_of(work
,
1685 struct nvme_rdma_ctrl
, delete_work
);
1687 __nvme_rdma_remove_ctrl(ctrl
, true);
1690 static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl
*ctrl
)
1692 if (!nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_DELETING
))
1695 if (!queue_work(nvme_rdma_wq
, &ctrl
->delete_work
))
1701 static int nvme_rdma_del_ctrl(struct nvme_ctrl
*nctrl
)
1703 struct nvme_rdma_ctrl
*ctrl
= to_rdma_ctrl(nctrl
);
1707 * Keep a reference until all work is flushed since
1708 * __nvme_rdma_del_ctrl can free the ctrl mem
1710 if (!kref_get_unless_zero(&ctrl
->ctrl
.kref
))
1712 ret
= __nvme_rdma_del_ctrl(ctrl
);
1714 flush_work(&ctrl
->delete_work
);
1715 nvme_put_ctrl(&ctrl
->ctrl
);
1719 static void nvme_rdma_remove_ctrl_work(struct work_struct
*work
)
1721 struct nvme_rdma_ctrl
*ctrl
= container_of(work
,
1722 struct nvme_rdma_ctrl
, delete_work
);
1724 __nvme_rdma_remove_ctrl(ctrl
, false);
1727 static void nvme_rdma_reset_ctrl_work(struct work_struct
*work
)
1729 struct nvme_rdma_ctrl
*ctrl
= container_of(work
,
1730 struct nvme_rdma_ctrl
, reset_work
);
1734 nvme_rdma_shutdown_ctrl(ctrl
);
1736 ret
= nvme_rdma_configure_admin_queue(ctrl
);
1738 /* ctrl is already shutdown, just remove the ctrl */
1739 INIT_WORK(&ctrl
->delete_work
, nvme_rdma_remove_ctrl_work
);
1743 if (ctrl
->queue_count
> 1) {
1744 ret
= blk_mq_reinit_tagset(&ctrl
->tag_set
);
1748 ret
= nvme_rdma_init_io_queues(ctrl
);
1752 ret
= nvme_rdma_connect_io_queues(ctrl
);
1757 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
1758 WARN_ON_ONCE(!changed
);
1760 if (ctrl
->queue_count
> 1) {
1761 nvme_start_queues(&ctrl
->ctrl
);
1762 nvme_queue_scan(&ctrl
->ctrl
);
1763 nvme_queue_async_events(&ctrl
->ctrl
);
1769 /* Deleting this dead controller... */
1770 dev_warn(ctrl
->ctrl
.device
, "Removing after reset failure\n");
1771 WARN_ON(!queue_work(nvme_rdma_wq
, &ctrl
->delete_work
));
1774 static int nvme_rdma_reset_ctrl(struct nvme_ctrl
*nctrl
)
1776 struct nvme_rdma_ctrl
*ctrl
= to_rdma_ctrl(nctrl
);
1778 if (!nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_RESETTING
))
1781 if (!queue_work(nvme_rdma_wq
, &ctrl
->reset_work
))
1784 flush_work(&ctrl
->reset_work
);
1789 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops
= {
1791 .module
= THIS_MODULE
,
1793 .reg_read32
= nvmf_reg_read32
,
1794 .reg_read64
= nvmf_reg_read64
,
1795 .reg_write32
= nvmf_reg_write32
,
1796 .reset_ctrl
= nvme_rdma_reset_ctrl
,
1797 .free_ctrl
= nvme_rdma_free_ctrl
,
1798 .submit_async_event
= nvme_rdma_submit_async_event
,
1799 .delete_ctrl
= nvme_rdma_del_ctrl
,
1800 .get_subsysnqn
= nvmf_get_subsysnqn
,
1801 .get_address
= nvmf_get_address
,
1804 static int nvme_rdma_create_io_queues(struct nvme_rdma_ctrl
*ctrl
)
1808 ret
= nvme_rdma_init_io_queues(ctrl
);
1813 * We need a reference on the device as long as the tag_set is alive,
1814 * as the MRs in the request structures need a valid ib_device.
1817 if (!nvme_rdma_dev_get(ctrl
->device
))
1818 goto out_free_io_queues
;
1820 memset(&ctrl
->tag_set
, 0, sizeof(ctrl
->tag_set
));
1821 ctrl
->tag_set
.ops
= &nvme_rdma_mq_ops
;
1822 ctrl
->tag_set
.queue_depth
= ctrl
->ctrl
.opts
->queue_size
;
1823 ctrl
->tag_set
.reserved_tags
= 1; /* fabric connect */
1824 ctrl
->tag_set
.numa_node
= NUMA_NO_NODE
;
1825 ctrl
->tag_set
.flags
= BLK_MQ_F_SHOULD_MERGE
;
1826 ctrl
->tag_set
.cmd_size
= sizeof(struct nvme_rdma_request
) +
1827 SG_CHUNK_SIZE
* sizeof(struct scatterlist
);
1828 ctrl
->tag_set
.driver_data
= ctrl
;
1829 ctrl
->tag_set
.nr_hw_queues
= ctrl
->queue_count
- 1;
1830 ctrl
->tag_set
.timeout
= NVME_IO_TIMEOUT
;
1832 ret
= blk_mq_alloc_tag_set(&ctrl
->tag_set
);
1835 ctrl
->ctrl
.tagset
= &ctrl
->tag_set
;
1837 ctrl
->ctrl
.connect_q
= blk_mq_init_queue(&ctrl
->tag_set
);
1838 if (IS_ERR(ctrl
->ctrl
.connect_q
)) {
1839 ret
= PTR_ERR(ctrl
->ctrl
.connect_q
);
1840 goto out_free_tag_set
;
1843 ret
= nvme_rdma_connect_io_queues(ctrl
);
1845 goto out_cleanup_connect_q
;
1849 out_cleanup_connect_q
:
1850 blk_cleanup_queue(ctrl
->ctrl
.connect_q
);
1852 blk_mq_free_tag_set(&ctrl
->tag_set
);
1854 nvme_rdma_dev_put(ctrl
->device
);
1856 nvme_rdma_free_io_queues(ctrl
);
1860 static int nvme_rdma_parse_ipaddr(struct sockaddr_in
*in_addr
, char *p
)
1862 u8
*addr
= (u8
*)&in_addr
->sin_addr
.s_addr
;
1863 size_t buflen
= strlen(p
);
1865 /* XXX: handle IPv6 addresses */
1867 if (buflen
> INET_ADDRSTRLEN
)
1869 if (in4_pton(p
, buflen
, addr
, '\0', NULL
) == 0)
1871 in_addr
->sin_family
= AF_INET
;
1875 static struct nvme_ctrl
*nvme_rdma_create_ctrl(struct device
*dev
,
1876 struct nvmf_ctrl_options
*opts
)
1878 struct nvme_rdma_ctrl
*ctrl
;
1882 ctrl
= kzalloc(sizeof(*ctrl
), GFP_KERNEL
);
1884 return ERR_PTR(-ENOMEM
);
1885 ctrl
->ctrl
.opts
= opts
;
1886 INIT_LIST_HEAD(&ctrl
->list
);
1888 ret
= nvme_rdma_parse_ipaddr(&ctrl
->addr_in
, opts
->traddr
);
1890 pr_err("malformed IP address passed: %s\n", opts
->traddr
);
1894 if (opts
->mask
& NVMF_OPT_HOST_TRADDR
) {
1895 ret
= nvme_rdma_parse_ipaddr(&ctrl
->src_addr_in
,
1898 pr_err("malformed src IP address passed: %s\n",
1904 if (opts
->mask
& NVMF_OPT_TRSVCID
) {
1907 ret
= kstrtou16(opts
->trsvcid
, 0, &port
);
1911 ctrl
->addr_in
.sin_port
= cpu_to_be16(port
);
1913 ctrl
->addr_in
.sin_port
= cpu_to_be16(NVME_RDMA_IP_PORT
);
1916 ret
= nvme_init_ctrl(&ctrl
->ctrl
, dev
, &nvme_rdma_ctrl_ops
,
1917 0 /* no quirks, we're perfect! */);
1921 ctrl
->reconnect_delay
= opts
->reconnect_delay
;
1922 INIT_DELAYED_WORK(&ctrl
->reconnect_work
,
1923 nvme_rdma_reconnect_ctrl_work
);
1924 INIT_WORK(&ctrl
->err_work
, nvme_rdma_error_recovery_work
);
1925 INIT_WORK(&ctrl
->delete_work
, nvme_rdma_del_ctrl_work
);
1926 INIT_WORK(&ctrl
->reset_work
, nvme_rdma_reset_ctrl_work
);
1927 spin_lock_init(&ctrl
->lock
);
1929 ctrl
->queue_count
= opts
->nr_io_queues
+ 1; /* +1 for admin queue */
1930 ctrl
->ctrl
.sqsize
= opts
->queue_size
- 1;
1931 ctrl
->ctrl
.kato
= opts
->kato
;
1934 ctrl
->queues
= kcalloc(ctrl
->queue_count
, sizeof(*ctrl
->queues
),
1937 goto out_uninit_ctrl
;
1939 ret
= nvme_rdma_configure_admin_queue(ctrl
);
1941 goto out_kfree_queues
;
1943 /* sanity check icdoff */
1944 if (ctrl
->ctrl
.icdoff
) {
1945 dev_err(ctrl
->ctrl
.device
, "icdoff is not supported!\n");
1946 goto out_remove_admin_queue
;
1949 /* sanity check keyed sgls */
1950 if (!(ctrl
->ctrl
.sgls
& (1 << 20))) {
1951 dev_err(ctrl
->ctrl
.device
, "Mandatory keyed sgls are not support\n");
1952 goto out_remove_admin_queue
;
1955 if (opts
->queue_size
> ctrl
->ctrl
.maxcmd
) {
1956 /* warn if maxcmd is lower than queue_size */
1957 dev_warn(ctrl
->ctrl
.device
,
1958 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
1959 opts
->queue_size
, ctrl
->ctrl
.maxcmd
);
1960 opts
->queue_size
= ctrl
->ctrl
.maxcmd
;
1963 if (opts
->queue_size
> ctrl
->ctrl
.sqsize
+ 1) {
1964 /* warn if sqsize is lower than queue_size */
1965 dev_warn(ctrl
->ctrl
.device
,
1966 "queue_size %zu > ctrl sqsize %u, clamping down\n",
1967 opts
->queue_size
, ctrl
->ctrl
.sqsize
+ 1);
1968 opts
->queue_size
= ctrl
->ctrl
.sqsize
+ 1;
1971 if (opts
->nr_io_queues
) {
1972 ret
= nvme_rdma_create_io_queues(ctrl
);
1974 goto out_remove_admin_queue
;
1977 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
1978 WARN_ON_ONCE(!changed
);
1980 dev_info(ctrl
->ctrl
.device
, "new ctrl: NQN \"%s\", addr %pISp\n",
1981 ctrl
->ctrl
.opts
->subsysnqn
, &ctrl
->addr
);
1983 kref_get(&ctrl
->ctrl
.kref
);
1985 mutex_lock(&nvme_rdma_ctrl_mutex
);
1986 list_add_tail(&ctrl
->list
, &nvme_rdma_ctrl_list
);
1987 mutex_unlock(&nvme_rdma_ctrl_mutex
);
1989 if (opts
->nr_io_queues
) {
1990 nvme_queue_scan(&ctrl
->ctrl
);
1991 nvme_queue_async_events(&ctrl
->ctrl
);
1996 out_remove_admin_queue
:
1997 nvme_stop_keep_alive(&ctrl
->ctrl
);
1998 nvme_rdma_destroy_admin_queue(ctrl
);
2000 kfree(ctrl
->queues
);
2002 nvme_uninit_ctrl(&ctrl
->ctrl
);
2003 nvme_put_ctrl(&ctrl
->ctrl
);
2006 return ERR_PTR(ret
);
2009 return ERR_PTR(ret
);
2012 static struct nvmf_transport_ops nvme_rdma_transport
= {
2014 .required_opts
= NVMF_OPT_TRADDR
,
2015 .allowed_opts
= NVMF_OPT_TRSVCID
| NVMF_OPT_RECONNECT_DELAY
|
2016 NVMF_OPT_HOST_TRADDR
,
2017 .create_ctrl
= nvme_rdma_create_ctrl
,
2020 static void nvme_rdma_add_one(struct ib_device
*ib_device
)
2024 static void nvme_rdma_remove_one(struct ib_device
*ib_device
, void *client_data
)
2026 struct nvme_rdma_ctrl
*ctrl
;
2028 /* Delete all controllers using this device */
2029 mutex_lock(&nvme_rdma_ctrl_mutex
);
2030 list_for_each_entry(ctrl
, &nvme_rdma_ctrl_list
, list
) {
2031 if (ctrl
->device
->dev
!= ib_device
)
2033 dev_info(ctrl
->ctrl
.device
,
2034 "Removing ctrl: NQN \"%s\", addr %pISp\n",
2035 ctrl
->ctrl
.opts
->subsysnqn
, &ctrl
->addr
);
2036 __nvme_rdma_del_ctrl(ctrl
);
2038 mutex_unlock(&nvme_rdma_ctrl_mutex
);
2040 flush_workqueue(nvme_rdma_wq
);
2043 static struct ib_client nvme_rdma_ib_client
= {
2044 .name
= "nvme_rdma",
2045 .add
= nvme_rdma_add_one
,
2046 .remove
= nvme_rdma_remove_one
2049 static int __init
nvme_rdma_init_module(void)
2053 nvme_rdma_wq
= create_workqueue("nvme_rdma_wq");
2057 ret
= ib_register_client(&nvme_rdma_ib_client
);
2059 destroy_workqueue(nvme_rdma_wq
);
2063 return nvmf_register_transport(&nvme_rdma_transport
);
2066 static void __exit
nvme_rdma_cleanup_module(void)
2068 nvmf_unregister_transport(&nvme_rdma_transport
);
2069 ib_unregister_client(&nvme_rdma_ib_client
);
2070 destroy_workqueue(nvme_rdma_wq
);
2073 module_init(nvme_rdma_init_module
);
2074 module_exit(nvme_rdma_cleanup_module
);
2076 MODULE_LICENSE("GPL v2");