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 3000 /* 3 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
;
121 struct delayed_work reconnect_work
;
123 struct list_head list
;
125 struct blk_mq_tag_set admin_tag_set
;
126 struct nvme_rdma_device
*device
;
131 struct sockaddr_storage addr
;
132 struct sockaddr_storage src_addr
;
134 struct nvme_ctrl ctrl
;
137 static inline struct nvme_rdma_ctrl
*to_rdma_ctrl(struct nvme_ctrl
*ctrl
)
139 return container_of(ctrl
, struct nvme_rdma_ctrl
, ctrl
);
142 static LIST_HEAD(device_list
);
143 static DEFINE_MUTEX(device_list_mutex
);
145 static LIST_HEAD(nvme_rdma_ctrl_list
);
146 static DEFINE_MUTEX(nvme_rdma_ctrl_mutex
);
148 static struct workqueue_struct
*nvme_rdma_wq
;
151 * Disabling this option makes small I/O goes faster, but is fundamentally
152 * unsafe. With it turned off we will have to register a global rkey that
153 * allows read and write access to all physical memory.
155 static bool register_always
= true;
156 module_param(register_always
, bool, 0444);
157 MODULE_PARM_DESC(register_always
,
158 "Use memory registration even for contiguous memory regions");
160 static int nvme_rdma_cm_handler(struct rdma_cm_id
*cm_id
,
161 struct rdma_cm_event
*event
);
162 static void nvme_rdma_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
);
164 /* XXX: really should move to a generic header sooner or later.. */
165 static inline void put_unaligned_le24(u32 val
, u8
*p
)
172 static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue
*queue
)
174 return queue
- queue
->ctrl
->queues
;
177 static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue
*queue
)
179 return queue
->cmnd_capsule_len
- sizeof(struct nvme_command
);
182 static void nvme_rdma_free_qe(struct ib_device
*ibdev
, struct nvme_rdma_qe
*qe
,
183 size_t capsule_size
, enum dma_data_direction dir
)
185 ib_dma_unmap_single(ibdev
, qe
->dma
, capsule_size
, dir
);
189 static int nvme_rdma_alloc_qe(struct ib_device
*ibdev
, struct nvme_rdma_qe
*qe
,
190 size_t capsule_size
, enum dma_data_direction dir
)
192 qe
->data
= kzalloc(capsule_size
, GFP_KERNEL
);
196 qe
->dma
= ib_dma_map_single(ibdev
, qe
->data
, capsule_size
, dir
);
197 if (ib_dma_mapping_error(ibdev
, qe
->dma
)) {
205 static void nvme_rdma_free_ring(struct ib_device
*ibdev
,
206 struct nvme_rdma_qe
*ring
, size_t ib_queue_size
,
207 size_t capsule_size
, enum dma_data_direction dir
)
211 for (i
= 0; i
< ib_queue_size
; i
++)
212 nvme_rdma_free_qe(ibdev
, &ring
[i
], capsule_size
, dir
);
216 static struct nvme_rdma_qe
*nvme_rdma_alloc_ring(struct ib_device
*ibdev
,
217 size_t ib_queue_size
, size_t capsule_size
,
218 enum dma_data_direction dir
)
220 struct nvme_rdma_qe
*ring
;
223 ring
= kcalloc(ib_queue_size
, sizeof(struct nvme_rdma_qe
), GFP_KERNEL
);
227 for (i
= 0; i
< ib_queue_size
; i
++) {
228 if (nvme_rdma_alloc_qe(ibdev
, &ring
[i
], capsule_size
, dir
))
235 nvme_rdma_free_ring(ibdev
, ring
, i
, capsule_size
, dir
);
239 static void nvme_rdma_qp_event(struct ib_event
*event
, void *context
)
241 pr_debug("QP event %s (%d)\n",
242 ib_event_msg(event
->event
), event
->event
);
246 static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue
*queue
)
248 wait_for_completion_interruptible_timeout(&queue
->cm_done
,
249 msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS
) + 1);
250 return queue
->cm_error
;
253 static int nvme_rdma_create_qp(struct nvme_rdma_queue
*queue
, const int factor
)
255 struct nvme_rdma_device
*dev
= queue
->device
;
256 struct ib_qp_init_attr init_attr
;
259 memset(&init_attr
, 0, sizeof(init_attr
));
260 init_attr
.event_handler
= nvme_rdma_qp_event
;
262 init_attr
.cap
.max_send_wr
= factor
* queue
->queue_size
+ 1;
264 init_attr
.cap
.max_recv_wr
= queue
->queue_size
+ 1;
265 init_attr
.cap
.max_recv_sge
= 1;
266 init_attr
.cap
.max_send_sge
= 1 + NVME_RDMA_MAX_INLINE_SEGMENTS
;
267 init_attr
.sq_sig_type
= IB_SIGNAL_REQ_WR
;
268 init_attr
.qp_type
= IB_QPT_RC
;
269 init_attr
.send_cq
= queue
->ib_cq
;
270 init_attr
.recv_cq
= queue
->ib_cq
;
272 ret
= rdma_create_qp(queue
->cm_id
, dev
->pd
, &init_attr
);
274 queue
->qp
= queue
->cm_id
->qp
;
278 static int nvme_rdma_reinit_request(void *data
, struct request
*rq
)
280 struct nvme_rdma_ctrl
*ctrl
= data
;
281 struct nvme_rdma_device
*dev
= ctrl
->device
;
282 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
285 if (!req
->mr
->need_inval
)
288 ib_dereg_mr(req
->mr
);
290 req
->mr
= ib_alloc_mr(dev
->pd
, IB_MR_TYPE_MEM_REG
,
292 if (IS_ERR(req
->mr
)) {
293 ret
= PTR_ERR(req
->mr
);
298 req
->mr
->need_inval
= false;
304 static void __nvme_rdma_exit_request(struct nvme_rdma_ctrl
*ctrl
,
305 struct request
*rq
, unsigned int queue_idx
)
307 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
308 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[queue_idx
];
309 struct nvme_rdma_device
*dev
= queue
->device
;
312 ib_dereg_mr(req
->mr
);
314 nvme_rdma_free_qe(dev
->dev
, &req
->sqe
, sizeof(struct nvme_command
),
318 static void nvme_rdma_exit_request(struct blk_mq_tag_set
*set
,
319 struct request
*rq
, unsigned int hctx_idx
)
321 return __nvme_rdma_exit_request(set
->driver_data
, rq
, hctx_idx
+ 1);
324 static void nvme_rdma_exit_admin_request(struct blk_mq_tag_set
*set
,
325 struct request
*rq
, unsigned int hctx_idx
)
327 return __nvme_rdma_exit_request(set
->driver_data
, rq
, 0);
330 static int __nvme_rdma_init_request(struct nvme_rdma_ctrl
*ctrl
,
331 struct request
*rq
, unsigned int queue_idx
)
333 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
334 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[queue_idx
];
335 struct nvme_rdma_device
*dev
= queue
->device
;
336 struct ib_device
*ibdev
= dev
->dev
;
339 ret
= nvme_rdma_alloc_qe(ibdev
, &req
->sqe
, sizeof(struct nvme_command
),
344 req
->mr
= ib_alloc_mr(dev
->pd
, IB_MR_TYPE_MEM_REG
,
346 if (IS_ERR(req
->mr
)) {
347 ret
= PTR_ERR(req
->mr
);
356 nvme_rdma_free_qe(dev
->dev
, &req
->sqe
, sizeof(struct nvme_command
),
361 static int nvme_rdma_init_request(struct blk_mq_tag_set
*set
,
362 struct request
*rq
, unsigned int hctx_idx
,
363 unsigned int numa_node
)
365 return __nvme_rdma_init_request(set
->driver_data
, rq
, hctx_idx
+ 1);
368 static int nvme_rdma_init_admin_request(struct blk_mq_tag_set
*set
,
369 struct request
*rq
, unsigned int hctx_idx
,
370 unsigned int numa_node
)
372 return __nvme_rdma_init_request(set
->driver_data
, rq
, 0);
375 static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
376 unsigned int hctx_idx
)
378 struct nvme_rdma_ctrl
*ctrl
= data
;
379 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[hctx_idx
+ 1];
381 BUG_ON(hctx_idx
>= ctrl
->queue_count
);
383 hctx
->driver_data
= queue
;
387 static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx
*hctx
, void *data
,
388 unsigned int hctx_idx
)
390 struct nvme_rdma_ctrl
*ctrl
= data
;
391 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[0];
393 BUG_ON(hctx_idx
!= 0);
395 hctx
->driver_data
= queue
;
399 static void nvme_rdma_free_dev(struct kref
*ref
)
401 struct nvme_rdma_device
*ndev
=
402 container_of(ref
, struct nvme_rdma_device
, ref
);
404 mutex_lock(&device_list_mutex
);
405 list_del(&ndev
->entry
);
406 mutex_unlock(&device_list_mutex
);
408 ib_dealloc_pd(ndev
->pd
);
412 static void nvme_rdma_dev_put(struct nvme_rdma_device
*dev
)
414 kref_put(&dev
->ref
, nvme_rdma_free_dev
);
417 static int nvme_rdma_dev_get(struct nvme_rdma_device
*dev
)
419 return kref_get_unless_zero(&dev
->ref
);
422 static struct nvme_rdma_device
*
423 nvme_rdma_find_get_device(struct rdma_cm_id
*cm_id
)
425 struct nvme_rdma_device
*ndev
;
427 mutex_lock(&device_list_mutex
);
428 list_for_each_entry(ndev
, &device_list
, entry
) {
429 if (ndev
->dev
->node_guid
== cm_id
->device
->node_guid
&&
430 nvme_rdma_dev_get(ndev
))
434 ndev
= kzalloc(sizeof(*ndev
), GFP_KERNEL
);
438 ndev
->dev
= cm_id
->device
;
439 kref_init(&ndev
->ref
);
441 ndev
->pd
= ib_alloc_pd(ndev
->dev
,
442 register_always
? 0 : IB_PD_UNSAFE_GLOBAL_RKEY
);
443 if (IS_ERR(ndev
->pd
))
446 if (!(ndev
->dev
->attrs
.device_cap_flags
&
447 IB_DEVICE_MEM_MGT_EXTENSIONS
)) {
448 dev_err(&ndev
->dev
->dev
,
449 "Memory registrations not supported.\n");
453 list_add(&ndev
->entry
, &device_list
);
455 mutex_unlock(&device_list_mutex
);
459 ib_dealloc_pd(ndev
->pd
);
463 mutex_unlock(&device_list_mutex
);
467 static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue
*queue
)
469 struct nvme_rdma_device
*dev
;
470 struct ib_device
*ibdev
;
472 if (!test_and_clear_bit(NVME_RDMA_IB_QUEUE_ALLOCATED
, &queue
->flags
))
477 rdma_destroy_qp(queue
->cm_id
);
478 ib_free_cq(queue
->ib_cq
);
480 nvme_rdma_free_ring(ibdev
, queue
->rsp_ring
, queue
->queue_size
,
481 sizeof(struct nvme_completion
), DMA_FROM_DEVICE
);
483 nvme_rdma_dev_put(dev
);
486 static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue
*queue
,
487 struct nvme_rdma_device
*dev
)
489 struct ib_device
*ibdev
= dev
->dev
;
490 const int send_wr_factor
= 3; /* MR, SEND, INV */
491 const int cq_factor
= send_wr_factor
+ 1; /* + RECV */
492 int comp_vector
, idx
= nvme_rdma_queue_idx(queue
);
499 * The admin queue is barely used once the controller is live, so don't
500 * bother to spread it out.
505 comp_vector
= idx
% ibdev
->num_comp_vectors
;
508 /* +1 for ib_stop_cq */
509 queue
->ib_cq
= ib_alloc_cq(dev
->dev
, queue
,
510 cq_factor
* queue
->queue_size
+ 1, comp_vector
,
512 if (IS_ERR(queue
->ib_cq
)) {
513 ret
= PTR_ERR(queue
->ib_cq
);
517 ret
= nvme_rdma_create_qp(queue
, send_wr_factor
);
519 goto out_destroy_ib_cq
;
521 queue
->rsp_ring
= nvme_rdma_alloc_ring(ibdev
, queue
->queue_size
,
522 sizeof(struct nvme_completion
), DMA_FROM_DEVICE
);
523 if (!queue
->rsp_ring
) {
527 set_bit(NVME_RDMA_IB_QUEUE_ALLOCATED
, &queue
->flags
);
532 ib_destroy_qp(queue
->qp
);
534 ib_free_cq(queue
->ib_cq
);
539 static int nvme_rdma_init_queue(struct nvme_rdma_ctrl
*ctrl
,
540 int idx
, size_t queue_size
)
542 struct nvme_rdma_queue
*queue
;
543 struct sockaddr
*src_addr
= NULL
;
546 queue
= &ctrl
->queues
[idx
];
548 init_completion(&queue
->cm_done
);
551 queue
->cmnd_capsule_len
= ctrl
->ctrl
.ioccsz
* 16;
553 queue
->cmnd_capsule_len
= sizeof(struct nvme_command
);
555 queue
->queue_size
= queue_size
;
557 queue
->cm_id
= rdma_create_id(&init_net
, nvme_rdma_cm_handler
, queue
,
558 RDMA_PS_TCP
, IB_QPT_RC
);
559 if (IS_ERR(queue
->cm_id
)) {
560 dev_info(ctrl
->ctrl
.device
,
561 "failed to create CM ID: %ld\n", PTR_ERR(queue
->cm_id
));
562 return PTR_ERR(queue
->cm_id
);
565 if (ctrl
->ctrl
.opts
->mask
& NVMF_OPT_HOST_TRADDR
)
566 src_addr
= (struct sockaddr
*)&ctrl
->src_addr
;
568 queue
->cm_error
= -ETIMEDOUT
;
569 ret
= rdma_resolve_addr(queue
->cm_id
, src_addr
,
570 (struct sockaddr
*)&ctrl
->addr
,
571 NVME_RDMA_CONNECT_TIMEOUT_MS
);
573 dev_info(ctrl
->ctrl
.device
,
574 "rdma_resolve_addr failed (%d).\n", ret
);
575 goto out_destroy_cm_id
;
578 ret
= nvme_rdma_wait_for_cm(queue
);
580 dev_info(ctrl
->ctrl
.device
,
581 "rdma_resolve_addr wait failed (%d).\n", ret
);
582 goto out_destroy_cm_id
;
585 clear_bit(NVME_RDMA_Q_DELETING
, &queue
->flags
);
586 set_bit(NVME_RDMA_Q_CONNECTED
, &queue
->flags
);
591 nvme_rdma_destroy_queue_ib(queue
);
592 rdma_destroy_id(queue
->cm_id
);
596 static void nvme_rdma_stop_queue(struct nvme_rdma_queue
*queue
)
598 rdma_disconnect(queue
->cm_id
);
599 ib_drain_qp(queue
->qp
);
602 static void nvme_rdma_free_queue(struct nvme_rdma_queue
*queue
)
604 nvme_rdma_destroy_queue_ib(queue
);
605 rdma_destroy_id(queue
->cm_id
);
608 static void nvme_rdma_stop_and_free_queue(struct nvme_rdma_queue
*queue
)
610 if (test_and_set_bit(NVME_RDMA_Q_DELETING
, &queue
->flags
))
612 nvme_rdma_stop_queue(queue
);
613 nvme_rdma_free_queue(queue
);
616 static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl
*ctrl
)
620 for (i
= 1; i
< ctrl
->queue_count
; i
++)
621 nvme_rdma_stop_and_free_queue(&ctrl
->queues
[i
]);
624 static int nvme_rdma_connect_io_queues(struct nvme_rdma_ctrl
*ctrl
)
628 for (i
= 1; i
< ctrl
->queue_count
; i
++) {
629 ret
= nvmf_connect_io_queue(&ctrl
->ctrl
, i
);
631 dev_info(ctrl
->ctrl
.device
,
632 "failed to connect i/o queue: %d\n", ret
);
633 goto out_free_queues
;
635 set_bit(NVME_RDMA_Q_LIVE
, &ctrl
->queues
[i
].flags
);
641 nvme_rdma_free_io_queues(ctrl
);
645 static int nvme_rdma_init_io_queues(struct nvme_rdma_ctrl
*ctrl
)
647 struct nvmf_ctrl_options
*opts
= ctrl
->ctrl
.opts
;
648 unsigned int nr_io_queues
;
651 nr_io_queues
= min(opts
->nr_io_queues
, num_online_cpus());
652 ret
= nvme_set_queue_count(&ctrl
->ctrl
, &nr_io_queues
);
656 ctrl
->queue_count
= nr_io_queues
+ 1;
657 if (ctrl
->queue_count
< 2)
660 dev_info(ctrl
->ctrl
.device
,
661 "creating %d I/O queues.\n", nr_io_queues
);
663 for (i
= 1; i
< ctrl
->queue_count
; i
++) {
664 ret
= nvme_rdma_init_queue(ctrl
, i
,
665 ctrl
->ctrl
.opts
->queue_size
);
667 dev_info(ctrl
->ctrl
.device
,
668 "failed to initialize i/o queue: %d\n", ret
);
669 goto out_free_queues
;
676 for (i
--; i
>= 1; i
--)
677 nvme_rdma_stop_and_free_queue(&ctrl
->queues
[i
]);
682 static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl
*ctrl
)
684 nvme_rdma_free_qe(ctrl
->queues
[0].device
->dev
, &ctrl
->async_event_sqe
,
685 sizeof(struct nvme_command
), DMA_TO_DEVICE
);
686 nvme_rdma_stop_and_free_queue(&ctrl
->queues
[0]);
687 blk_cleanup_queue(ctrl
->ctrl
.admin_q
);
688 blk_mq_free_tag_set(&ctrl
->admin_tag_set
);
689 nvme_rdma_dev_put(ctrl
->device
);
692 static void nvme_rdma_free_ctrl(struct nvme_ctrl
*nctrl
)
694 struct nvme_rdma_ctrl
*ctrl
= to_rdma_ctrl(nctrl
);
696 if (list_empty(&ctrl
->list
))
699 mutex_lock(&nvme_rdma_ctrl_mutex
);
700 list_del(&ctrl
->list
);
701 mutex_unlock(&nvme_rdma_ctrl_mutex
);
704 nvmf_free_options(nctrl
->opts
);
709 static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl
*ctrl
)
711 /* If we are resetting/deleting then do nothing */
712 if (ctrl
->ctrl
.state
!= NVME_CTRL_RECONNECTING
) {
713 WARN_ON_ONCE(ctrl
->ctrl
.state
== NVME_CTRL_NEW
||
714 ctrl
->ctrl
.state
== NVME_CTRL_LIVE
);
718 if (nvmf_should_reconnect(&ctrl
->ctrl
)) {
719 dev_info(ctrl
->ctrl
.device
, "Reconnecting in %d seconds...\n",
720 ctrl
->ctrl
.opts
->reconnect_delay
);
721 queue_delayed_work(nvme_rdma_wq
, &ctrl
->reconnect_work
,
722 ctrl
->ctrl
.opts
->reconnect_delay
* HZ
);
724 dev_info(ctrl
->ctrl
.device
, "Removing controller...\n");
725 queue_work(nvme_rdma_wq
, &ctrl
->delete_work
);
729 static void nvme_rdma_reconnect_ctrl_work(struct work_struct
*work
)
731 struct nvme_rdma_ctrl
*ctrl
= container_of(to_delayed_work(work
),
732 struct nvme_rdma_ctrl
, reconnect_work
);
736 ++ctrl
->ctrl
.opts
->nr_reconnects
;
738 if (ctrl
->queue_count
> 1) {
739 nvme_rdma_free_io_queues(ctrl
);
741 ret
= blk_mq_reinit_tagset(&ctrl
->tag_set
);
746 nvme_rdma_stop_and_free_queue(&ctrl
->queues
[0]);
748 ret
= blk_mq_reinit_tagset(&ctrl
->admin_tag_set
);
752 ret
= nvme_rdma_init_queue(ctrl
, 0, NVMF_AQ_DEPTH
);
756 blk_mq_start_stopped_hw_queues(ctrl
->ctrl
.admin_q
, true);
758 ret
= nvmf_connect_admin_queue(&ctrl
->ctrl
);
762 set_bit(NVME_RDMA_Q_LIVE
, &ctrl
->queues
[0].flags
);
764 ret
= nvme_enable_ctrl(&ctrl
->ctrl
, ctrl
->cap
);
768 nvme_start_keep_alive(&ctrl
->ctrl
);
770 if (ctrl
->queue_count
> 1) {
771 ret
= nvme_rdma_init_io_queues(ctrl
);
775 ret
= nvme_rdma_connect_io_queues(ctrl
);
780 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
781 WARN_ON_ONCE(!changed
);
782 ctrl
->ctrl
.opts
->nr_reconnects
= 0;
784 if (ctrl
->queue_count
> 1) {
785 nvme_start_queues(&ctrl
->ctrl
);
786 nvme_queue_scan(&ctrl
->ctrl
);
787 nvme_queue_async_events(&ctrl
->ctrl
);
790 dev_info(ctrl
->ctrl
.device
, "Successfully reconnected\n");
795 blk_mq_stop_hw_queues(ctrl
->ctrl
.admin_q
);
797 dev_info(ctrl
->ctrl
.device
, "Failed reconnect attempt %d\n",
798 ctrl
->ctrl
.opts
->nr_reconnects
);
799 nvme_rdma_reconnect_or_remove(ctrl
);
802 static void nvme_rdma_error_recovery_work(struct work_struct
*work
)
804 struct nvme_rdma_ctrl
*ctrl
= container_of(work
,
805 struct nvme_rdma_ctrl
, err_work
);
808 nvme_stop_keep_alive(&ctrl
->ctrl
);
810 for (i
= 0; i
< ctrl
->queue_count
; i
++) {
811 clear_bit(NVME_RDMA_Q_CONNECTED
, &ctrl
->queues
[i
].flags
);
812 clear_bit(NVME_RDMA_Q_LIVE
, &ctrl
->queues
[i
].flags
);
815 if (ctrl
->queue_count
> 1)
816 nvme_stop_queues(&ctrl
->ctrl
);
817 blk_mq_stop_hw_queues(ctrl
->ctrl
.admin_q
);
819 /* We must take care of fastfail/requeue all our inflight requests */
820 if (ctrl
->queue_count
> 1)
821 blk_mq_tagset_busy_iter(&ctrl
->tag_set
,
822 nvme_cancel_request
, &ctrl
->ctrl
);
823 blk_mq_tagset_busy_iter(&ctrl
->admin_tag_set
,
824 nvme_cancel_request
, &ctrl
->ctrl
);
826 nvme_rdma_reconnect_or_remove(ctrl
);
829 static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl
*ctrl
)
831 if (!nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_RECONNECTING
))
834 queue_work(nvme_rdma_wq
, &ctrl
->err_work
);
837 static void nvme_rdma_wr_error(struct ib_cq
*cq
, struct ib_wc
*wc
,
840 struct nvme_rdma_queue
*queue
= cq
->cq_context
;
841 struct nvme_rdma_ctrl
*ctrl
= queue
->ctrl
;
843 if (ctrl
->ctrl
.state
== NVME_CTRL_LIVE
)
844 dev_info(ctrl
->ctrl
.device
,
845 "%s for CQE 0x%p failed with status %s (%d)\n",
847 ib_wc_status_msg(wc
->status
), wc
->status
);
848 nvme_rdma_error_recovery(ctrl
);
851 static void nvme_rdma_memreg_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
853 if (unlikely(wc
->status
!= IB_WC_SUCCESS
))
854 nvme_rdma_wr_error(cq
, wc
, "MEMREG");
857 static void nvme_rdma_inv_rkey_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
859 if (unlikely(wc
->status
!= IB_WC_SUCCESS
))
860 nvme_rdma_wr_error(cq
, wc
, "LOCAL_INV");
863 static int nvme_rdma_inv_rkey(struct nvme_rdma_queue
*queue
,
864 struct nvme_rdma_request
*req
)
866 struct ib_send_wr
*bad_wr
;
867 struct ib_send_wr wr
= {
868 .opcode
= IB_WR_LOCAL_INV
,
872 .ex
.invalidate_rkey
= req
->mr
->rkey
,
875 req
->reg_cqe
.done
= nvme_rdma_inv_rkey_done
;
876 wr
.wr_cqe
= &req
->reg_cqe
;
878 return ib_post_send(queue
->qp
, &wr
, &bad_wr
);
881 static void nvme_rdma_unmap_data(struct nvme_rdma_queue
*queue
,
884 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
885 struct nvme_rdma_ctrl
*ctrl
= queue
->ctrl
;
886 struct nvme_rdma_device
*dev
= queue
->device
;
887 struct ib_device
*ibdev
= dev
->dev
;
890 if (!blk_rq_bytes(rq
))
893 if (req
->mr
->need_inval
) {
894 res
= nvme_rdma_inv_rkey(queue
, req
);
896 dev_err(ctrl
->ctrl
.device
,
897 "Queueing INV WR for rkey %#x failed (%d)\n",
899 nvme_rdma_error_recovery(queue
->ctrl
);
903 ib_dma_unmap_sg(ibdev
, req
->sg_table
.sgl
,
904 req
->nents
, rq_data_dir(rq
) ==
905 WRITE
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
907 nvme_cleanup_cmd(rq
);
908 sg_free_table_chained(&req
->sg_table
, true);
911 static int nvme_rdma_set_sg_null(struct nvme_command
*c
)
913 struct nvme_keyed_sgl_desc
*sg
= &c
->common
.dptr
.ksgl
;
916 put_unaligned_le24(0, sg
->length
);
917 put_unaligned_le32(0, sg
->key
);
918 sg
->type
= NVME_KEY_SGL_FMT_DATA_DESC
<< 4;
922 static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue
*queue
,
923 struct nvme_rdma_request
*req
, struct nvme_command
*c
)
925 struct nvme_sgl_desc
*sg
= &c
->common
.dptr
.sgl
;
927 req
->sge
[1].addr
= sg_dma_address(req
->sg_table
.sgl
);
928 req
->sge
[1].length
= sg_dma_len(req
->sg_table
.sgl
);
929 req
->sge
[1].lkey
= queue
->device
->pd
->local_dma_lkey
;
931 sg
->addr
= cpu_to_le64(queue
->ctrl
->ctrl
.icdoff
);
932 sg
->length
= cpu_to_le32(sg_dma_len(req
->sg_table
.sgl
));
933 sg
->type
= (NVME_SGL_FMT_DATA_DESC
<< 4) | NVME_SGL_FMT_OFFSET
;
935 req
->inline_data
= true;
940 static int nvme_rdma_map_sg_single(struct nvme_rdma_queue
*queue
,
941 struct nvme_rdma_request
*req
, struct nvme_command
*c
)
943 struct nvme_keyed_sgl_desc
*sg
= &c
->common
.dptr
.ksgl
;
945 sg
->addr
= cpu_to_le64(sg_dma_address(req
->sg_table
.sgl
));
946 put_unaligned_le24(sg_dma_len(req
->sg_table
.sgl
), sg
->length
);
947 put_unaligned_le32(queue
->device
->pd
->unsafe_global_rkey
, sg
->key
);
948 sg
->type
= NVME_KEY_SGL_FMT_DATA_DESC
<< 4;
952 static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue
*queue
,
953 struct nvme_rdma_request
*req
, struct nvme_command
*c
,
956 struct nvme_keyed_sgl_desc
*sg
= &c
->common
.dptr
.ksgl
;
959 nr
= ib_map_mr_sg(req
->mr
, req
->sg_table
.sgl
, count
, NULL
, PAGE_SIZE
);
966 ib_update_fast_reg_key(req
->mr
, ib_inc_rkey(req
->mr
->rkey
));
968 req
->reg_cqe
.done
= nvme_rdma_memreg_done
;
969 memset(&req
->reg_wr
, 0, sizeof(req
->reg_wr
));
970 req
->reg_wr
.wr
.opcode
= IB_WR_REG_MR
;
971 req
->reg_wr
.wr
.wr_cqe
= &req
->reg_cqe
;
972 req
->reg_wr
.wr
.num_sge
= 0;
973 req
->reg_wr
.mr
= req
->mr
;
974 req
->reg_wr
.key
= req
->mr
->rkey
;
975 req
->reg_wr
.access
= IB_ACCESS_LOCAL_WRITE
|
976 IB_ACCESS_REMOTE_READ
|
977 IB_ACCESS_REMOTE_WRITE
;
979 req
->mr
->need_inval
= true;
981 sg
->addr
= cpu_to_le64(req
->mr
->iova
);
982 put_unaligned_le24(req
->mr
->length
, sg
->length
);
983 put_unaligned_le32(req
->mr
->rkey
, sg
->key
);
984 sg
->type
= (NVME_KEY_SGL_FMT_DATA_DESC
<< 4) |
985 NVME_SGL_FMT_INVALIDATE
;
990 static int nvme_rdma_map_data(struct nvme_rdma_queue
*queue
,
991 struct request
*rq
, struct nvme_command
*c
)
993 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
994 struct nvme_rdma_device
*dev
= queue
->device
;
995 struct ib_device
*ibdev
= dev
->dev
;
999 req
->inline_data
= false;
1000 req
->mr
->need_inval
= false;
1002 c
->common
.flags
|= NVME_CMD_SGL_METABUF
;
1004 if (!blk_rq_bytes(rq
))
1005 return nvme_rdma_set_sg_null(c
);
1007 req
->sg_table
.sgl
= req
->first_sgl
;
1008 ret
= sg_alloc_table_chained(&req
->sg_table
,
1009 blk_rq_nr_phys_segments(rq
), req
->sg_table
.sgl
);
1013 req
->nents
= blk_rq_map_sg(rq
->q
, rq
, req
->sg_table
.sgl
);
1015 count
= ib_dma_map_sg(ibdev
, req
->sg_table
.sgl
, req
->nents
,
1016 rq_data_dir(rq
) == WRITE
? DMA_TO_DEVICE
: DMA_FROM_DEVICE
);
1017 if (unlikely(count
<= 0)) {
1018 sg_free_table_chained(&req
->sg_table
, true);
1023 if (rq_data_dir(rq
) == WRITE
&& nvme_rdma_queue_idx(queue
) &&
1024 blk_rq_payload_bytes(rq
) <=
1025 nvme_rdma_inline_data_size(queue
))
1026 return nvme_rdma_map_sg_inline(queue
, req
, c
);
1028 if (dev
->pd
->flags
& IB_PD_UNSAFE_GLOBAL_RKEY
)
1029 return nvme_rdma_map_sg_single(queue
, req
, c
);
1032 return nvme_rdma_map_sg_fr(queue
, req
, c
, count
);
1035 static void nvme_rdma_send_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1037 if (unlikely(wc
->status
!= IB_WC_SUCCESS
))
1038 nvme_rdma_wr_error(cq
, wc
, "SEND");
1041 static int nvme_rdma_post_send(struct nvme_rdma_queue
*queue
,
1042 struct nvme_rdma_qe
*qe
, struct ib_sge
*sge
, u32 num_sge
,
1043 struct ib_send_wr
*first
, bool flush
)
1045 struct ib_send_wr wr
, *bad_wr
;
1048 sge
->addr
= qe
->dma
;
1049 sge
->length
= sizeof(struct nvme_command
),
1050 sge
->lkey
= queue
->device
->pd
->local_dma_lkey
;
1052 qe
->cqe
.done
= nvme_rdma_send_done
;
1055 wr
.wr_cqe
= &qe
->cqe
;
1057 wr
.num_sge
= num_sge
;
1058 wr
.opcode
= IB_WR_SEND
;
1062 * Unsignalled send completions are another giant desaster in the
1063 * IB Verbs spec: If we don't regularly post signalled sends
1064 * the send queue will fill up and only a QP reset will rescue us.
1065 * Would have been way to obvious to handle this in hardware or
1066 * at least the RDMA stack..
1068 * This messy and racy code sniplet is copy and pasted from the iSER
1069 * initiator, and the magic '32' comes from there as well.
1071 * Always signal the flushes. The magic request used for the flush
1072 * sequencer is not allocated in our driver's tagset and it's
1073 * triggered to be freed by blk_cleanup_queue(). So we need to
1074 * always mark it as signaled to ensure that the "wr_cqe", which is
1075 * embedded in request's payload, is not freed when __ib_process_cq()
1076 * calls wr_cqe->done().
1078 if ((++queue
->sig_count
% 32) == 0 || flush
)
1079 wr
.send_flags
|= IB_SEND_SIGNALED
;
1086 ret
= ib_post_send(queue
->qp
, first
, &bad_wr
);
1088 dev_err(queue
->ctrl
->ctrl
.device
,
1089 "%s failed with error code %d\n", __func__
, ret
);
1094 static int nvme_rdma_post_recv(struct nvme_rdma_queue
*queue
,
1095 struct nvme_rdma_qe
*qe
)
1097 struct ib_recv_wr wr
, *bad_wr
;
1101 list
.addr
= qe
->dma
;
1102 list
.length
= sizeof(struct nvme_completion
);
1103 list
.lkey
= queue
->device
->pd
->local_dma_lkey
;
1105 qe
->cqe
.done
= nvme_rdma_recv_done
;
1108 wr
.wr_cqe
= &qe
->cqe
;
1112 ret
= ib_post_recv(queue
->qp
, &wr
, &bad_wr
);
1114 dev_err(queue
->ctrl
->ctrl
.device
,
1115 "%s failed with error code %d\n", __func__
, ret
);
1120 static struct blk_mq_tags
*nvme_rdma_tagset(struct nvme_rdma_queue
*queue
)
1122 u32 queue_idx
= nvme_rdma_queue_idx(queue
);
1125 return queue
->ctrl
->admin_tag_set
.tags
[queue_idx
];
1126 return queue
->ctrl
->tag_set
.tags
[queue_idx
- 1];
1129 static void nvme_rdma_submit_async_event(struct nvme_ctrl
*arg
, int aer_idx
)
1131 struct nvme_rdma_ctrl
*ctrl
= to_rdma_ctrl(arg
);
1132 struct nvme_rdma_queue
*queue
= &ctrl
->queues
[0];
1133 struct ib_device
*dev
= queue
->device
->dev
;
1134 struct nvme_rdma_qe
*sqe
= &ctrl
->async_event_sqe
;
1135 struct nvme_command
*cmd
= sqe
->data
;
1139 if (WARN_ON_ONCE(aer_idx
!= 0))
1142 ib_dma_sync_single_for_cpu(dev
, sqe
->dma
, sizeof(*cmd
), DMA_TO_DEVICE
);
1144 memset(cmd
, 0, sizeof(*cmd
));
1145 cmd
->common
.opcode
= nvme_admin_async_event
;
1146 cmd
->common
.command_id
= NVME_RDMA_AQ_BLKMQ_DEPTH
;
1147 cmd
->common
.flags
|= NVME_CMD_SGL_METABUF
;
1148 nvme_rdma_set_sg_null(cmd
);
1150 ib_dma_sync_single_for_device(dev
, sqe
->dma
, sizeof(*cmd
),
1153 ret
= nvme_rdma_post_send(queue
, sqe
, &sge
, 1, NULL
, false);
1157 static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue
*queue
,
1158 struct nvme_completion
*cqe
, struct ib_wc
*wc
, int tag
)
1161 struct nvme_rdma_request
*req
;
1164 rq
= blk_mq_tag_to_rq(nvme_rdma_tagset(queue
), cqe
->command_id
);
1166 dev_err(queue
->ctrl
->ctrl
.device
,
1167 "tag 0x%x on QP %#x not found\n",
1168 cqe
->command_id
, queue
->qp
->qp_num
);
1169 nvme_rdma_error_recovery(queue
->ctrl
);
1172 req
= blk_mq_rq_to_pdu(rq
);
1177 if ((wc
->wc_flags
& IB_WC_WITH_INVALIDATE
) &&
1178 wc
->ex
.invalidate_rkey
== req
->mr
->rkey
)
1179 req
->mr
->need_inval
= false;
1181 nvme_end_request(rq
, cqe
->status
, cqe
->result
);
1185 static int __nvme_rdma_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
, int tag
)
1187 struct nvme_rdma_qe
*qe
=
1188 container_of(wc
->wr_cqe
, struct nvme_rdma_qe
, cqe
);
1189 struct nvme_rdma_queue
*queue
= cq
->cq_context
;
1190 struct ib_device
*ibdev
= queue
->device
->dev
;
1191 struct nvme_completion
*cqe
= qe
->data
;
1192 const size_t len
= sizeof(struct nvme_completion
);
1195 if (unlikely(wc
->status
!= IB_WC_SUCCESS
)) {
1196 nvme_rdma_wr_error(cq
, wc
, "RECV");
1200 ib_dma_sync_single_for_cpu(ibdev
, qe
->dma
, len
, DMA_FROM_DEVICE
);
1202 * AEN requests are special as they don't time out and can
1203 * survive any kind of queue freeze and often don't respond to
1204 * aborts. We don't even bother to allocate a struct request
1205 * for them but rather special case them here.
1207 if (unlikely(nvme_rdma_queue_idx(queue
) == 0 &&
1208 cqe
->command_id
>= NVME_RDMA_AQ_BLKMQ_DEPTH
))
1209 nvme_complete_async_event(&queue
->ctrl
->ctrl
, cqe
->status
,
1212 ret
= nvme_rdma_process_nvme_rsp(queue
, cqe
, wc
, tag
);
1213 ib_dma_sync_single_for_device(ibdev
, qe
->dma
, len
, DMA_FROM_DEVICE
);
1215 nvme_rdma_post_recv(queue
, qe
);
1219 static void nvme_rdma_recv_done(struct ib_cq
*cq
, struct ib_wc
*wc
)
1221 __nvme_rdma_recv_done(cq
, wc
, -1);
1224 static int nvme_rdma_conn_established(struct nvme_rdma_queue
*queue
)
1228 for (i
= 0; i
< queue
->queue_size
; i
++) {
1229 ret
= nvme_rdma_post_recv(queue
, &queue
->rsp_ring
[i
]);
1231 goto out_destroy_queue_ib
;
1236 out_destroy_queue_ib
:
1237 nvme_rdma_destroy_queue_ib(queue
);
1241 static int nvme_rdma_conn_rejected(struct nvme_rdma_queue
*queue
,
1242 struct rdma_cm_event
*ev
)
1244 struct rdma_cm_id
*cm_id
= queue
->cm_id
;
1245 int status
= ev
->status
;
1246 const char *rej_msg
;
1247 const struct nvme_rdma_cm_rej
*rej_data
;
1250 rej_msg
= rdma_reject_msg(cm_id
, status
);
1251 rej_data
= rdma_consumer_reject_data(cm_id
, ev
, &rej_data_len
);
1253 if (rej_data
&& rej_data_len
>= sizeof(u16
)) {
1254 u16 sts
= le16_to_cpu(rej_data
->sts
);
1256 dev_err(queue
->ctrl
->ctrl
.device
,
1257 "Connect rejected: status %d (%s) nvme status %d (%s).\n",
1258 status
, rej_msg
, sts
, nvme_rdma_cm_msg(sts
));
1260 dev_err(queue
->ctrl
->ctrl
.device
,
1261 "Connect rejected: status %d (%s).\n", status
, rej_msg
);
1267 static int nvme_rdma_addr_resolved(struct nvme_rdma_queue
*queue
)
1269 struct nvme_rdma_device
*dev
;
1272 dev
= nvme_rdma_find_get_device(queue
->cm_id
);
1274 dev_err(queue
->cm_id
->device
->dev
.parent
,
1275 "no client data found!\n");
1276 return -ECONNREFUSED
;
1279 ret
= nvme_rdma_create_queue_ib(queue
, dev
);
1281 nvme_rdma_dev_put(dev
);
1285 ret
= rdma_resolve_route(queue
->cm_id
, NVME_RDMA_CONNECT_TIMEOUT_MS
);
1287 dev_err(queue
->ctrl
->ctrl
.device
,
1288 "rdma_resolve_route failed (%d).\n",
1290 goto out_destroy_queue
;
1296 nvme_rdma_destroy_queue_ib(queue
);
1301 static int nvme_rdma_route_resolved(struct nvme_rdma_queue
*queue
)
1303 struct nvme_rdma_ctrl
*ctrl
= queue
->ctrl
;
1304 struct rdma_conn_param param
= { };
1305 struct nvme_rdma_cm_req priv
= { };
1308 param
.qp_num
= queue
->qp
->qp_num
;
1309 param
.flow_control
= 1;
1311 param
.responder_resources
= queue
->device
->dev
->attrs
.max_qp_rd_atom
;
1312 /* maximum retry count */
1313 param
.retry_count
= 7;
1314 param
.rnr_retry_count
= 7;
1315 param
.private_data
= &priv
;
1316 param
.private_data_len
= sizeof(priv
);
1318 priv
.recfmt
= cpu_to_le16(NVME_RDMA_CM_FMT_1_0
);
1319 priv
.qid
= cpu_to_le16(nvme_rdma_queue_idx(queue
));
1321 * set the admin queue depth to the minimum size
1322 * specified by the Fabrics standard.
1324 if (priv
.qid
== 0) {
1325 priv
.hrqsize
= cpu_to_le16(NVMF_AQ_DEPTH
);
1326 priv
.hsqsize
= cpu_to_le16(NVMF_AQ_DEPTH
- 1);
1329 * current interpretation of the fabrics spec
1330 * is at minimum you make hrqsize sqsize+1, or a
1331 * 1's based representation of sqsize.
1333 priv
.hrqsize
= cpu_to_le16(queue
->queue_size
);
1334 priv
.hsqsize
= cpu_to_le16(queue
->ctrl
->ctrl
.sqsize
);
1337 ret
= rdma_connect(queue
->cm_id
, ¶m
);
1339 dev_err(ctrl
->ctrl
.device
,
1340 "rdma_connect failed (%d).\n", ret
);
1341 goto out_destroy_queue_ib
;
1346 out_destroy_queue_ib
:
1347 nvme_rdma_destroy_queue_ib(queue
);
1351 static int nvme_rdma_cm_handler(struct rdma_cm_id
*cm_id
,
1352 struct rdma_cm_event
*ev
)
1354 struct nvme_rdma_queue
*queue
= cm_id
->context
;
1357 dev_dbg(queue
->ctrl
->ctrl
.device
, "%s (%d): status %d id %p\n",
1358 rdma_event_msg(ev
->event
), ev
->event
,
1361 switch (ev
->event
) {
1362 case RDMA_CM_EVENT_ADDR_RESOLVED
:
1363 cm_error
= nvme_rdma_addr_resolved(queue
);
1365 case RDMA_CM_EVENT_ROUTE_RESOLVED
:
1366 cm_error
= nvme_rdma_route_resolved(queue
);
1368 case RDMA_CM_EVENT_ESTABLISHED
:
1369 queue
->cm_error
= nvme_rdma_conn_established(queue
);
1370 /* complete cm_done regardless of success/failure */
1371 complete(&queue
->cm_done
);
1373 case RDMA_CM_EVENT_REJECTED
:
1374 cm_error
= nvme_rdma_conn_rejected(queue
, ev
);
1376 case RDMA_CM_EVENT_ADDR_ERROR
:
1377 case RDMA_CM_EVENT_ROUTE_ERROR
:
1378 case RDMA_CM_EVENT_CONNECT_ERROR
:
1379 case RDMA_CM_EVENT_UNREACHABLE
:
1380 dev_dbg(queue
->ctrl
->ctrl
.device
,
1381 "CM error event %d\n", ev
->event
);
1382 cm_error
= -ECONNRESET
;
1384 case RDMA_CM_EVENT_DISCONNECTED
:
1385 case RDMA_CM_EVENT_ADDR_CHANGE
:
1386 case RDMA_CM_EVENT_TIMEWAIT_EXIT
:
1387 dev_dbg(queue
->ctrl
->ctrl
.device
,
1388 "disconnect received - connection closed\n");
1389 nvme_rdma_error_recovery(queue
->ctrl
);
1391 case RDMA_CM_EVENT_DEVICE_REMOVAL
:
1392 /* device removal is handled via the ib_client API */
1395 dev_err(queue
->ctrl
->ctrl
.device
,
1396 "Unexpected RDMA CM event (%d)\n", ev
->event
);
1397 nvme_rdma_error_recovery(queue
->ctrl
);
1402 queue
->cm_error
= cm_error
;
1403 complete(&queue
->cm_done
);
1409 static enum blk_eh_timer_return
1410 nvme_rdma_timeout(struct request
*rq
, bool reserved
)
1412 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
1414 /* queue error recovery */
1415 nvme_rdma_error_recovery(req
->queue
->ctrl
);
1417 /* fail with DNR on cmd timeout */
1418 nvme_req(rq
)->status
= NVME_SC_ABORT_REQ
| NVME_SC_DNR
;
1420 return BLK_EH_HANDLED
;
1424 * We cannot accept any other command until the Connect command has completed.
1426 static inline bool nvme_rdma_queue_is_ready(struct nvme_rdma_queue
*queue
,
1429 if (unlikely(!test_bit(NVME_RDMA_Q_LIVE
, &queue
->flags
))) {
1430 struct nvme_command
*cmd
= nvme_req(rq
)->cmd
;
1432 if (!blk_rq_is_passthrough(rq
) ||
1433 cmd
->common
.opcode
!= nvme_fabrics_command
||
1434 cmd
->fabrics
.fctype
!= nvme_fabrics_type_connect
)
1441 static int nvme_rdma_queue_rq(struct blk_mq_hw_ctx
*hctx
,
1442 const struct blk_mq_queue_data
*bd
)
1444 struct nvme_ns
*ns
= hctx
->queue
->queuedata
;
1445 struct nvme_rdma_queue
*queue
= hctx
->driver_data
;
1446 struct request
*rq
= bd
->rq
;
1447 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
1448 struct nvme_rdma_qe
*sqe
= &req
->sqe
;
1449 struct nvme_command
*c
= sqe
->data
;
1451 struct ib_device
*dev
;
1454 WARN_ON_ONCE(rq
->tag
< 0);
1456 if (!nvme_rdma_queue_is_ready(queue
, rq
))
1457 return BLK_MQ_RQ_QUEUE_BUSY
;
1459 dev
= queue
->device
->dev
;
1460 ib_dma_sync_single_for_cpu(dev
, sqe
->dma
,
1461 sizeof(struct nvme_command
), DMA_TO_DEVICE
);
1463 ret
= nvme_setup_cmd(ns
, rq
, c
);
1464 if (ret
!= BLK_MQ_RQ_QUEUE_OK
)
1467 blk_mq_start_request(rq
);
1469 ret
= nvme_rdma_map_data(queue
, rq
, c
);
1471 dev_err(queue
->ctrl
->ctrl
.device
,
1472 "Failed to map data (%d)\n", ret
);
1473 nvme_cleanup_cmd(rq
);
1477 ib_dma_sync_single_for_device(dev
, sqe
->dma
,
1478 sizeof(struct nvme_command
), DMA_TO_DEVICE
);
1480 if (req_op(rq
) == REQ_OP_FLUSH
)
1482 ret
= nvme_rdma_post_send(queue
, sqe
, req
->sge
, req
->num_sge
,
1483 req
->mr
->need_inval
? &req
->reg_wr
.wr
: NULL
, flush
);
1485 nvme_rdma_unmap_data(queue
, rq
);
1489 return BLK_MQ_RQ_QUEUE_OK
;
1491 return (ret
== -ENOMEM
|| ret
== -EAGAIN
) ?
1492 BLK_MQ_RQ_QUEUE_BUSY
: BLK_MQ_RQ_QUEUE_ERROR
;
1495 static int nvme_rdma_poll(struct blk_mq_hw_ctx
*hctx
, unsigned int tag
)
1497 struct nvme_rdma_queue
*queue
= hctx
->driver_data
;
1498 struct ib_cq
*cq
= queue
->ib_cq
;
1502 ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
1503 while (ib_poll_cq(cq
, 1, &wc
) > 0) {
1504 struct ib_cqe
*cqe
= wc
.wr_cqe
;
1507 if (cqe
->done
== nvme_rdma_recv_done
)
1508 found
|= __nvme_rdma_recv_done(cq
, &wc
, tag
);
1517 static void nvme_rdma_complete_rq(struct request
*rq
)
1519 struct nvme_rdma_request
*req
= blk_mq_rq_to_pdu(rq
);
1521 nvme_rdma_unmap_data(req
->queue
, rq
);
1522 nvme_complete_rq(rq
);
1525 static const struct blk_mq_ops nvme_rdma_mq_ops
= {
1526 .queue_rq
= nvme_rdma_queue_rq
,
1527 .complete
= nvme_rdma_complete_rq
,
1528 .init_request
= nvme_rdma_init_request
,
1529 .exit_request
= nvme_rdma_exit_request
,
1530 .reinit_request
= nvme_rdma_reinit_request
,
1531 .init_hctx
= nvme_rdma_init_hctx
,
1532 .poll
= nvme_rdma_poll
,
1533 .timeout
= nvme_rdma_timeout
,
1536 static const struct blk_mq_ops nvme_rdma_admin_mq_ops
= {
1537 .queue_rq
= nvme_rdma_queue_rq
,
1538 .complete
= nvme_rdma_complete_rq
,
1539 .init_request
= nvme_rdma_init_admin_request
,
1540 .exit_request
= nvme_rdma_exit_admin_request
,
1541 .reinit_request
= nvme_rdma_reinit_request
,
1542 .init_hctx
= nvme_rdma_init_admin_hctx
,
1543 .timeout
= nvme_rdma_timeout
,
1546 static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl
*ctrl
)
1550 error
= nvme_rdma_init_queue(ctrl
, 0, NVMF_AQ_DEPTH
);
1554 ctrl
->device
= ctrl
->queues
[0].device
;
1557 * We need a reference on the device as long as the tag_set is alive,
1558 * as the MRs in the request structures need a valid ib_device.
1561 if (!nvme_rdma_dev_get(ctrl
->device
))
1562 goto out_free_queue
;
1564 ctrl
->max_fr_pages
= min_t(u32
, NVME_RDMA_MAX_SEGMENTS
,
1565 ctrl
->device
->dev
->attrs
.max_fast_reg_page_list_len
);
1567 memset(&ctrl
->admin_tag_set
, 0, sizeof(ctrl
->admin_tag_set
));
1568 ctrl
->admin_tag_set
.ops
= &nvme_rdma_admin_mq_ops
;
1569 ctrl
->admin_tag_set
.queue_depth
= NVME_RDMA_AQ_BLKMQ_DEPTH
;
1570 ctrl
->admin_tag_set
.reserved_tags
= 2; /* connect + keep-alive */
1571 ctrl
->admin_tag_set
.numa_node
= NUMA_NO_NODE
;
1572 ctrl
->admin_tag_set
.cmd_size
= sizeof(struct nvme_rdma_request
) +
1573 SG_CHUNK_SIZE
* sizeof(struct scatterlist
);
1574 ctrl
->admin_tag_set
.driver_data
= ctrl
;
1575 ctrl
->admin_tag_set
.nr_hw_queues
= 1;
1576 ctrl
->admin_tag_set
.timeout
= ADMIN_TIMEOUT
;
1578 error
= blk_mq_alloc_tag_set(&ctrl
->admin_tag_set
);
1582 ctrl
->ctrl
.admin_q
= blk_mq_init_queue(&ctrl
->admin_tag_set
);
1583 if (IS_ERR(ctrl
->ctrl
.admin_q
)) {
1584 error
= PTR_ERR(ctrl
->ctrl
.admin_q
);
1585 goto out_free_tagset
;
1588 error
= nvmf_connect_admin_queue(&ctrl
->ctrl
);
1590 goto out_cleanup_queue
;
1592 set_bit(NVME_RDMA_Q_LIVE
, &ctrl
->queues
[0].flags
);
1594 error
= nvmf_reg_read64(&ctrl
->ctrl
, NVME_REG_CAP
, &ctrl
->cap
);
1596 dev_err(ctrl
->ctrl
.device
,
1597 "prop_get NVME_REG_CAP failed\n");
1598 goto out_cleanup_queue
;
1602 min_t(int, NVME_CAP_MQES(ctrl
->cap
), ctrl
->ctrl
.sqsize
);
1604 error
= nvme_enable_ctrl(&ctrl
->ctrl
, ctrl
->cap
);
1606 goto out_cleanup_queue
;
1608 ctrl
->ctrl
.max_hw_sectors
=
1609 (ctrl
->max_fr_pages
- 1) << (PAGE_SHIFT
- 9);
1611 error
= nvme_init_identify(&ctrl
->ctrl
);
1613 goto out_cleanup_queue
;
1615 error
= nvme_rdma_alloc_qe(ctrl
->queues
[0].device
->dev
,
1616 &ctrl
->async_event_sqe
, sizeof(struct nvme_command
),
1619 goto out_cleanup_queue
;
1621 nvme_start_keep_alive(&ctrl
->ctrl
);
1626 blk_cleanup_queue(ctrl
->ctrl
.admin_q
);
1628 /* disconnect and drain the queue before freeing the tagset */
1629 nvme_rdma_stop_queue(&ctrl
->queues
[0]);
1630 blk_mq_free_tag_set(&ctrl
->admin_tag_set
);
1632 nvme_rdma_dev_put(ctrl
->device
);
1634 nvme_rdma_free_queue(&ctrl
->queues
[0]);
1638 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl
*ctrl
)
1640 nvme_stop_keep_alive(&ctrl
->ctrl
);
1641 cancel_work_sync(&ctrl
->err_work
);
1642 cancel_delayed_work_sync(&ctrl
->reconnect_work
);
1644 if (ctrl
->queue_count
> 1) {
1645 nvme_stop_queues(&ctrl
->ctrl
);
1646 blk_mq_tagset_busy_iter(&ctrl
->tag_set
,
1647 nvme_cancel_request
, &ctrl
->ctrl
);
1648 nvme_rdma_free_io_queues(ctrl
);
1651 if (test_bit(NVME_RDMA_Q_CONNECTED
, &ctrl
->queues
[0].flags
))
1652 nvme_shutdown_ctrl(&ctrl
->ctrl
);
1654 blk_mq_stop_hw_queues(ctrl
->ctrl
.admin_q
);
1655 blk_mq_tagset_busy_iter(&ctrl
->admin_tag_set
,
1656 nvme_cancel_request
, &ctrl
->ctrl
);
1657 nvme_rdma_destroy_admin_queue(ctrl
);
1660 static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl
*ctrl
, bool shutdown
)
1662 nvme_uninit_ctrl(&ctrl
->ctrl
);
1664 nvme_rdma_shutdown_ctrl(ctrl
);
1666 if (ctrl
->ctrl
.tagset
) {
1667 blk_cleanup_queue(ctrl
->ctrl
.connect_q
);
1668 blk_mq_free_tag_set(&ctrl
->tag_set
);
1669 nvme_rdma_dev_put(ctrl
->device
);
1672 nvme_put_ctrl(&ctrl
->ctrl
);
1675 static void nvme_rdma_del_ctrl_work(struct work_struct
*work
)
1677 struct nvme_rdma_ctrl
*ctrl
= container_of(work
,
1678 struct nvme_rdma_ctrl
, delete_work
);
1680 __nvme_rdma_remove_ctrl(ctrl
, true);
1683 static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl
*ctrl
)
1685 if (!nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_DELETING
))
1688 if (!queue_work(nvme_rdma_wq
, &ctrl
->delete_work
))
1694 static int nvme_rdma_del_ctrl(struct nvme_ctrl
*nctrl
)
1696 struct nvme_rdma_ctrl
*ctrl
= to_rdma_ctrl(nctrl
);
1700 * Keep a reference until all work is flushed since
1701 * __nvme_rdma_del_ctrl can free the ctrl mem
1703 if (!kref_get_unless_zero(&ctrl
->ctrl
.kref
))
1705 ret
= __nvme_rdma_del_ctrl(ctrl
);
1707 flush_work(&ctrl
->delete_work
);
1708 nvme_put_ctrl(&ctrl
->ctrl
);
1712 static void nvme_rdma_remove_ctrl_work(struct work_struct
*work
)
1714 struct nvme_rdma_ctrl
*ctrl
= container_of(work
,
1715 struct nvme_rdma_ctrl
, delete_work
);
1717 __nvme_rdma_remove_ctrl(ctrl
, false);
1720 static void nvme_rdma_reset_ctrl_work(struct work_struct
*work
)
1722 struct nvme_rdma_ctrl
*ctrl
= container_of(work
,
1723 struct nvme_rdma_ctrl
, reset_work
);
1727 nvme_rdma_shutdown_ctrl(ctrl
);
1729 ret
= nvme_rdma_configure_admin_queue(ctrl
);
1731 /* ctrl is already shutdown, just remove the ctrl */
1732 INIT_WORK(&ctrl
->delete_work
, nvme_rdma_remove_ctrl_work
);
1736 if (ctrl
->queue_count
> 1) {
1737 ret
= blk_mq_reinit_tagset(&ctrl
->tag_set
);
1741 ret
= nvme_rdma_init_io_queues(ctrl
);
1745 ret
= nvme_rdma_connect_io_queues(ctrl
);
1750 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
1751 WARN_ON_ONCE(!changed
);
1753 if (ctrl
->queue_count
> 1) {
1754 nvme_start_queues(&ctrl
->ctrl
);
1755 nvme_queue_scan(&ctrl
->ctrl
);
1756 nvme_queue_async_events(&ctrl
->ctrl
);
1762 /* Deleting this dead controller... */
1763 dev_warn(ctrl
->ctrl
.device
, "Removing after reset failure\n");
1764 WARN_ON(!queue_work(nvme_rdma_wq
, &ctrl
->delete_work
));
1767 static int nvme_rdma_reset_ctrl(struct nvme_ctrl
*nctrl
)
1769 struct nvme_rdma_ctrl
*ctrl
= to_rdma_ctrl(nctrl
);
1771 if (!nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_RESETTING
))
1774 if (!queue_work(nvme_rdma_wq
, &ctrl
->reset_work
))
1777 flush_work(&ctrl
->reset_work
);
1782 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops
= {
1784 .module
= THIS_MODULE
,
1786 .reg_read32
= nvmf_reg_read32
,
1787 .reg_read64
= nvmf_reg_read64
,
1788 .reg_write32
= nvmf_reg_write32
,
1789 .reset_ctrl
= nvme_rdma_reset_ctrl
,
1790 .free_ctrl
= nvme_rdma_free_ctrl
,
1791 .submit_async_event
= nvme_rdma_submit_async_event
,
1792 .delete_ctrl
= nvme_rdma_del_ctrl
,
1793 .get_subsysnqn
= nvmf_get_subsysnqn
,
1794 .get_address
= nvmf_get_address
,
1797 static int nvme_rdma_create_io_queues(struct nvme_rdma_ctrl
*ctrl
)
1801 ret
= nvme_rdma_init_io_queues(ctrl
);
1806 * We need a reference on the device as long as the tag_set is alive,
1807 * as the MRs in the request structures need a valid ib_device.
1810 if (!nvme_rdma_dev_get(ctrl
->device
))
1811 goto out_free_io_queues
;
1813 memset(&ctrl
->tag_set
, 0, sizeof(ctrl
->tag_set
));
1814 ctrl
->tag_set
.ops
= &nvme_rdma_mq_ops
;
1815 ctrl
->tag_set
.queue_depth
= ctrl
->ctrl
.opts
->queue_size
;
1816 ctrl
->tag_set
.reserved_tags
= 1; /* fabric connect */
1817 ctrl
->tag_set
.numa_node
= NUMA_NO_NODE
;
1818 ctrl
->tag_set
.flags
= BLK_MQ_F_SHOULD_MERGE
;
1819 ctrl
->tag_set
.cmd_size
= sizeof(struct nvme_rdma_request
) +
1820 SG_CHUNK_SIZE
* sizeof(struct scatterlist
);
1821 ctrl
->tag_set
.driver_data
= ctrl
;
1822 ctrl
->tag_set
.nr_hw_queues
= ctrl
->queue_count
- 1;
1823 ctrl
->tag_set
.timeout
= NVME_IO_TIMEOUT
;
1825 ret
= blk_mq_alloc_tag_set(&ctrl
->tag_set
);
1828 ctrl
->ctrl
.tagset
= &ctrl
->tag_set
;
1830 ctrl
->ctrl
.connect_q
= blk_mq_init_queue(&ctrl
->tag_set
);
1831 if (IS_ERR(ctrl
->ctrl
.connect_q
)) {
1832 ret
= PTR_ERR(ctrl
->ctrl
.connect_q
);
1833 goto out_free_tag_set
;
1836 ret
= nvme_rdma_connect_io_queues(ctrl
);
1838 goto out_cleanup_connect_q
;
1842 out_cleanup_connect_q
:
1843 blk_cleanup_queue(ctrl
->ctrl
.connect_q
);
1845 blk_mq_free_tag_set(&ctrl
->tag_set
);
1847 nvme_rdma_dev_put(ctrl
->device
);
1849 nvme_rdma_free_io_queues(ctrl
);
1853 static struct nvme_ctrl
*nvme_rdma_create_ctrl(struct device
*dev
,
1854 struct nvmf_ctrl_options
*opts
)
1856 struct nvme_rdma_ctrl
*ctrl
;
1861 ctrl
= kzalloc(sizeof(*ctrl
), GFP_KERNEL
);
1863 return ERR_PTR(-ENOMEM
);
1864 ctrl
->ctrl
.opts
= opts
;
1865 INIT_LIST_HEAD(&ctrl
->list
);
1867 if (opts
->mask
& NVMF_OPT_TRSVCID
)
1868 port
= opts
->trsvcid
;
1870 port
= __stringify(NVME_RDMA_IP_PORT
);
1872 ret
= inet_pton_with_scope(&init_net
, AF_UNSPEC
,
1873 opts
->traddr
, port
, &ctrl
->addr
);
1875 pr_err("malformed address passed: %s:%s\n", opts
->traddr
, port
);
1879 if (opts
->mask
& NVMF_OPT_HOST_TRADDR
) {
1880 ret
= inet_pton_with_scope(&init_net
, AF_UNSPEC
,
1881 opts
->host_traddr
, NULL
, &ctrl
->src_addr
);
1883 pr_err("malformed src address passed: %s\n",
1889 ret
= nvme_init_ctrl(&ctrl
->ctrl
, dev
, &nvme_rdma_ctrl_ops
,
1890 0 /* no quirks, we're perfect! */);
1894 INIT_DELAYED_WORK(&ctrl
->reconnect_work
,
1895 nvme_rdma_reconnect_ctrl_work
);
1896 INIT_WORK(&ctrl
->err_work
, nvme_rdma_error_recovery_work
);
1897 INIT_WORK(&ctrl
->delete_work
, nvme_rdma_del_ctrl_work
);
1898 INIT_WORK(&ctrl
->reset_work
, nvme_rdma_reset_ctrl_work
);
1899 spin_lock_init(&ctrl
->lock
);
1901 ctrl
->queue_count
= opts
->nr_io_queues
+ 1; /* +1 for admin queue */
1902 ctrl
->ctrl
.sqsize
= opts
->queue_size
- 1;
1903 ctrl
->ctrl
.kato
= opts
->kato
;
1906 ctrl
->queues
= kcalloc(ctrl
->queue_count
, sizeof(*ctrl
->queues
),
1909 goto out_uninit_ctrl
;
1911 ret
= nvme_rdma_configure_admin_queue(ctrl
);
1913 goto out_kfree_queues
;
1915 /* sanity check icdoff */
1916 if (ctrl
->ctrl
.icdoff
) {
1917 dev_err(ctrl
->ctrl
.device
, "icdoff is not supported!\n");
1918 goto out_remove_admin_queue
;
1921 /* sanity check keyed sgls */
1922 if (!(ctrl
->ctrl
.sgls
& (1 << 20))) {
1923 dev_err(ctrl
->ctrl
.device
, "Mandatory keyed sgls are not support\n");
1924 goto out_remove_admin_queue
;
1927 if (opts
->queue_size
> ctrl
->ctrl
.maxcmd
) {
1928 /* warn if maxcmd is lower than queue_size */
1929 dev_warn(ctrl
->ctrl
.device
,
1930 "queue_size %zu > ctrl maxcmd %u, clamping down\n",
1931 opts
->queue_size
, ctrl
->ctrl
.maxcmd
);
1932 opts
->queue_size
= ctrl
->ctrl
.maxcmd
;
1935 if (opts
->queue_size
> ctrl
->ctrl
.sqsize
+ 1) {
1936 /* warn if sqsize is lower than queue_size */
1937 dev_warn(ctrl
->ctrl
.device
,
1938 "queue_size %zu > ctrl sqsize %u, clamping down\n",
1939 opts
->queue_size
, ctrl
->ctrl
.sqsize
+ 1);
1940 opts
->queue_size
= ctrl
->ctrl
.sqsize
+ 1;
1943 if (opts
->nr_io_queues
) {
1944 ret
= nvme_rdma_create_io_queues(ctrl
);
1946 goto out_remove_admin_queue
;
1949 changed
= nvme_change_ctrl_state(&ctrl
->ctrl
, NVME_CTRL_LIVE
);
1950 WARN_ON_ONCE(!changed
);
1952 dev_info(ctrl
->ctrl
.device
, "new ctrl: NQN \"%s\", addr %pISpcs\n",
1953 ctrl
->ctrl
.opts
->subsysnqn
, &ctrl
->addr
);
1955 kref_get(&ctrl
->ctrl
.kref
);
1957 mutex_lock(&nvme_rdma_ctrl_mutex
);
1958 list_add_tail(&ctrl
->list
, &nvme_rdma_ctrl_list
);
1959 mutex_unlock(&nvme_rdma_ctrl_mutex
);
1961 if (opts
->nr_io_queues
) {
1962 nvme_queue_scan(&ctrl
->ctrl
);
1963 nvme_queue_async_events(&ctrl
->ctrl
);
1968 out_remove_admin_queue
:
1969 nvme_stop_keep_alive(&ctrl
->ctrl
);
1970 nvme_rdma_destroy_admin_queue(ctrl
);
1972 kfree(ctrl
->queues
);
1974 nvme_uninit_ctrl(&ctrl
->ctrl
);
1975 nvme_put_ctrl(&ctrl
->ctrl
);
1978 return ERR_PTR(ret
);
1981 return ERR_PTR(ret
);
1984 static struct nvmf_transport_ops nvme_rdma_transport
= {
1986 .required_opts
= NVMF_OPT_TRADDR
,
1987 .allowed_opts
= NVMF_OPT_TRSVCID
| NVMF_OPT_RECONNECT_DELAY
|
1988 NVMF_OPT_HOST_TRADDR
| NVMF_OPT_CTRL_LOSS_TMO
,
1989 .create_ctrl
= nvme_rdma_create_ctrl
,
1992 static void nvme_rdma_add_one(struct ib_device
*ib_device
)
1996 static void nvme_rdma_remove_one(struct ib_device
*ib_device
, void *client_data
)
1998 struct nvme_rdma_ctrl
*ctrl
;
2000 /* Delete all controllers using this device */
2001 mutex_lock(&nvme_rdma_ctrl_mutex
);
2002 list_for_each_entry(ctrl
, &nvme_rdma_ctrl_list
, list
) {
2003 if (ctrl
->device
->dev
!= ib_device
)
2005 dev_info(ctrl
->ctrl
.device
,
2006 "Removing ctrl: NQN \"%s\", addr %pISp\n",
2007 ctrl
->ctrl
.opts
->subsysnqn
, &ctrl
->addr
);
2008 __nvme_rdma_del_ctrl(ctrl
);
2010 mutex_unlock(&nvme_rdma_ctrl_mutex
);
2012 flush_workqueue(nvme_rdma_wq
);
2015 static struct ib_client nvme_rdma_ib_client
= {
2016 .name
= "nvme_rdma",
2017 .add
= nvme_rdma_add_one
,
2018 .remove
= nvme_rdma_remove_one
2021 static int __init
nvme_rdma_init_module(void)
2025 nvme_rdma_wq
= create_workqueue("nvme_rdma_wq");
2029 ret
= ib_register_client(&nvme_rdma_ib_client
);
2031 goto err_destroy_wq
;
2033 ret
= nvmf_register_transport(&nvme_rdma_transport
);
2035 goto err_unreg_client
;
2040 ib_unregister_client(&nvme_rdma_ib_client
);
2042 destroy_workqueue(nvme_rdma_wq
);
2046 static void __exit
nvme_rdma_cleanup_module(void)
2048 nvmf_unregister_transport(&nvme_rdma_transport
);
2049 ib_unregister_client(&nvme_rdma_ib_client
);
2050 destroy_workqueue(nvme_rdma_wq
);
2053 module_init(nvme_rdma_init_module
);
2054 module_exit(nvme_rdma_cleanup_module
);
2056 MODULE_LICENSE("GPL v2");