2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/err.h>
39 #include <linux/string.h>
40 #include <linux/parser.h>
41 #include <linux/random.h>
42 #include <linux/jiffies.h>
43 #include <rdma/ib_cache.h>
45 #include <linux/atomic.h>
47 #include <scsi/scsi.h>
48 #include <scsi/scsi_device.h>
49 #include <scsi/scsi_dbg.h>
50 #include <scsi/scsi_tcq.h>
52 #include <scsi/scsi_transport_srp.h>
56 #define DRV_NAME "ib_srp"
57 #define PFX DRV_NAME ": "
58 #define DRV_VERSION "2.0"
59 #define DRV_RELDATE "July 26, 2015"
61 MODULE_AUTHOR("Roland Dreier");
62 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator");
63 MODULE_LICENSE("Dual BSD/GPL");
64 MODULE_VERSION(DRV_VERSION
);
65 MODULE_INFO(release_date
, DRV_RELDATE
);
67 static unsigned int srp_sg_tablesize
;
68 static unsigned int cmd_sg_entries
;
69 static unsigned int indirect_sg_entries
;
70 static bool allow_ext_sg
;
71 static bool prefer_fr
;
72 static bool register_always
;
73 static int topspin_workarounds
= 1;
75 module_param(srp_sg_tablesize
, uint
, 0444);
76 MODULE_PARM_DESC(srp_sg_tablesize
, "Deprecated name for cmd_sg_entries");
78 module_param(cmd_sg_entries
, uint
, 0444);
79 MODULE_PARM_DESC(cmd_sg_entries
,
80 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
82 module_param(indirect_sg_entries
, uint
, 0444);
83 MODULE_PARM_DESC(indirect_sg_entries
,
84 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS
) ")");
86 module_param(allow_ext_sg
, bool, 0444);
87 MODULE_PARM_DESC(allow_ext_sg
,
88 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
90 module_param(topspin_workarounds
, int, 0444);
91 MODULE_PARM_DESC(topspin_workarounds
,
92 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
94 module_param(prefer_fr
, bool, 0444);
95 MODULE_PARM_DESC(prefer_fr
,
96 "Whether to use fast registration if both FMR and fast registration are supported");
98 module_param(register_always
, bool, 0444);
99 MODULE_PARM_DESC(register_always
,
100 "Use memory registration even for contiguous memory regions");
102 static const struct kernel_param_ops srp_tmo_ops
;
104 static int srp_reconnect_delay
= 10;
105 module_param_cb(reconnect_delay
, &srp_tmo_ops
, &srp_reconnect_delay
,
107 MODULE_PARM_DESC(reconnect_delay
, "Time between successive reconnect attempts");
109 static int srp_fast_io_fail_tmo
= 15;
110 module_param_cb(fast_io_fail_tmo
, &srp_tmo_ops
, &srp_fast_io_fail_tmo
,
112 MODULE_PARM_DESC(fast_io_fail_tmo
,
113 "Number of seconds between the observation of a transport"
114 " layer error and failing all I/O. \"off\" means that this"
115 " functionality is disabled.");
117 static int srp_dev_loss_tmo
= 600;
118 module_param_cb(dev_loss_tmo
, &srp_tmo_ops
, &srp_dev_loss_tmo
,
120 MODULE_PARM_DESC(dev_loss_tmo
,
121 "Maximum number of seconds that the SRP transport should"
122 " insulate transport layer errors. After this time has been"
123 " exceeded the SCSI host is removed. Should be"
124 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT
)
125 " if fast_io_fail_tmo has not been set. \"off\" means that"
126 " this functionality is disabled.");
128 static unsigned ch_count
;
129 module_param(ch_count
, uint
, 0444);
130 MODULE_PARM_DESC(ch_count
,
131 "Number of RDMA channels to use for communication with an SRP target. Using more than one channel improves performance if the HCA supports multiple completion vectors. The default value is the minimum of four times the number of online CPU sockets and the number of completion vectors supported by the HCA.");
133 static void srp_add_one(struct ib_device
*device
);
134 static void srp_remove_one(struct ib_device
*device
, void *client_data
);
135 static void srp_recv_completion(struct ib_cq
*cq
, void *ch_ptr
);
136 static void srp_send_completion(struct ib_cq
*cq
, void *ch_ptr
);
137 static int srp_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
);
139 static struct scsi_transport_template
*ib_srp_transport_template
;
140 static struct workqueue_struct
*srp_remove_wq
;
142 static struct ib_client srp_client
= {
145 .remove
= srp_remove_one
148 static struct ib_sa_client srp_sa_client
;
150 static int srp_tmo_get(char *buffer
, const struct kernel_param
*kp
)
152 int tmo
= *(int *)kp
->arg
;
155 return sprintf(buffer
, "%d", tmo
);
157 return sprintf(buffer
, "off");
160 static int srp_tmo_set(const char *val
, const struct kernel_param
*kp
)
164 res
= srp_parse_tmo(&tmo
, val
);
168 if (kp
->arg
== &srp_reconnect_delay
)
169 res
= srp_tmo_valid(tmo
, srp_fast_io_fail_tmo
,
171 else if (kp
->arg
== &srp_fast_io_fail_tmo
)
172 res
= srp_tmo_valid(srp_reconnect_delay
, tmo
, srp_dev_loss_tmo
);
174 res
= srp_tmo_valid(srp_reconnect_delay
, srp_fast_io_fail_tmo
,
178 *(int *)kp
->arg
= tmo
;
184 static const struct kernel_param_ops srp_tmo_ops
= {
189 static inline struct srp_target_port
*host_to_target(struct Scsi_Host
*host
)
191 return (struct srp_target_port
*) host
->hostdata
;
194 static const char *srp_target_info(struct Scsi_Host
*host
)
196 return host_to_target(host
)->target_name
;
199 static int srp_target_is_topspin(struct srp_target_port
*target
)
201 static const u8 topspin_oui
[3] = { 0x00, 0x05, 0xad };
202 static const u8 cisco_oui
[3] = { 0x00, 0x1b, 0x0d };
204 return topspin_workarounds
&&
205 (!memcmp(&target
->ioc_guid
, topspin_oui
, sizeof topspin_oui
) ||
206 !memcmp(&target
->ioc_guid
, cisco_oui
, sizeof cisco_oui
));
209 static struct srp_iu
*srp_alloc_iu(struct srp_host
*host
, size_t size
,
211 enum dma_data_direction direction
)
215 iu
= kmalloc(sizeof *iu
, gfp_mask
);
219 iu
->buf
= kzalloc(size
, gfp_mask
);
223 iu
->dma
= ib_dma_map_single(host
->srp_dev
->dev
, iu
->buf
, size
,
225 if (ib_dma_mapping_error(host
->srp_dev
->dev
, iu
->dma
))
229 iu
->direction
= direction
;
241 static void srp_free_iu(struct srp_host
*host
, struct srp_iu
*iu
)
246 ib_dma_unmap_single(host
->srp_dev
->dev
, iu
->dma
, iu
->size
,
252 static void srp_qp_event(struct ib_event
*event
, void *context
)
254 pr_debug("QP event %s (%d)\n",
255 ib_event_msg(event
->event
), event
->event
);
258 static int srp_init_qp(struct srp_target_port
*target
,
261 struct ib_qp_attr
*attr
;
264 attr
= kmalloc(sizeof *attr
, GFP_KERNEL
);
268 ret
= ib_find_cached_pkey(target
->srp_host
->srp_dev
->dev
,
269 target
->srp_host
->port
,
270 be16_to_cpu(target
->pkey
),
275 attr
->qp_state
= IB_QPS_INIT
;
276 attr
->qp_access_flags
= (IB_ACCESS_REMOTE_READ
|
277 IB_ACCESS_REMOTE_WRITE
);
278 attr
->port_num
= target
->srp_host
->port
;
280 ret
= ib_modify_qp(qp
, attr
,
291 static int srp_new_cm_id(struct srp_rdma_ch
*ch
)
293 struct srp_target_port
*target
= ch
->target
;
294 struct ib_cm_id
*new_cm_id
;
296 new_cm_id
= ib_create_cm_id(target
->srp_host
->srp_dev
->dev
,
298 if (IS_ERR(new_cm_id
))
299 return PTR_ERR(new_cm_id
);
302 ib_destroy_cm_id(ch
->cm_id
);
303 ch
->cm_id
= new_cm_id
;
304 ch
->path
.sgid
= target
->sgid
;
305 ch
->path
.dgid
= target
->orig_dgid
;
306 ch
->path
.pkey
= target
->pkey
;
307 ch
->path
.service_id
= target
->service_id
;
312 static struct ib_fmr_pool
*srp_alloc_fmr_pool(struct srp_target_port
*target
)
314 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
315 struct ib_fmr_pool_param fmr_param
;
317 memset(&fmr_param
, 0, sizeof(fmr_param
));
318 fmr_param
.pool_size
= target
->scsi_host
->can_queue
;
319 fmr_param
.dirty_watermark
= fmr_param
.pool_size
/ 4;
321 fmr_param
.max_pages_per_fmr
= dev
->max_pages_per_mr
;
322 fmr_param
.page_shift
= ilog2(dev
->mr_page_size
);
323 fmr_param
.access
= (IB_ACCESS_LOCAL_WRITE
|
324 IB_ACCESS_REMOTE_WRITE
|
325 IB_ACCESS_REMOTE_READ
);
327 return ib_create_fmr_pool(dev
->pd
, &fmr_param
);
331 * srp_destroy_fr_pool() - free the resources owned by a pool
332 * @pool: Fast registration pool to be destroyed.
334 static void srp_destroy_fr_pool(struct srp_fr_pool
*pool
)
337 struct srp_fr_desc
*d
;
342 for (i
= 0, d
= &pool
->desc
[0]; i
< pool
->size
; i
++, d
++) {
344 ib_free_fast_reg_page_list(d
->frpl
);
352 * srp_create_fr_pool() - allocate and initialize a pool for fast registration
353 * @device: IB device to allocate fast registration descriptors for.
354 * @pd: Protection domain associated with the FR descriptors.
355 * @pool_size: Number of descriptors to allocate.
356 * @max_page_list_len: Maximum fast registration work request page list length.
358 static struct srp_fr_pool
*srp_create_fr_pool(struct ib_device
*device
,
359 struct ib_pd
*pd
, int pool_size
,
360 int max_page_list_len
)
362 struct srp_fr_pool
*pool
;
363 struct srp_fr_desc
*d
;
365 struct ib_fast_reg_page_list
*frpl
;
366 int i
, ret
= -EINVAL
;
371 pool
= kzalloc(sizeof(struct srp_fr_pool
) +
372 pool_size
* sizeof(struct srp_fr_desc
), GFP_KERNEL
);
375 pool
->size
= pool_size
;
376 pool
->max_page_list_len
= max_page_list_len
;
377 spin_lock_init(&pool
->lock
);
378 INIT_LIST_HEAD(&pool
->free_list
);
380 for (i
= 0, d
= &pool
->desc
[0]; i
< pool
->size
; i
++, d
++) {
381 mr
= ib_alloc_mr(pd
, IB_MR_TYPE_MEM_REG
,
388 frpl
= ib_alloc_fast_reg_page_list(device
, max_page_list_len
);
394 list_add_tail(&d
->entry
, &pool
->free_list
);
401 srp_destroy_fr_pool(pool
);
409 * srp_fr_pool_get() - obtain a descriptor suitable for fast registration
410 * @pool: Pool to obtain descriptor from.
412 static struct srp_fr_desc
*srp_fr_pool_get(struct srp_fr_pool
*pool
)
414 struct srp_fr_desc
*d
= NULL
;
417 spin_lock_irqsave(&pool
->lock
, flags
);
418 if (!list_empty(&pool
->free_list
)) {
419 d
= list_first_entry(&pool
->free_list
, typeof(*d
), entry
);
422 spin_unlock_irqrestore(&pool
->lock
, flags
);
428 * srp_fr_pool_put() - put an FR descriptor back in the free list
429 * @pool: Pool the descriptor was allocated from.
430 * @desc: Pointer to an array of fast registration descriptor pointers.
431 * @n: Number of descriptors to put back.
433 * Note: The caller must already have queued an invalidation request for
434 * desc->mr->rkey before calling this function.
436 static void srp_fr_pool_put(struct srp_fr_pool
*pool
, struct srp_fr_desc
**desc
,
442 spin_lock_irqsave(&pool
->lock
, flags
);
443 for (i
= 0; i
< n
; i
++)
444 list_add(&desc
[i
]->entry
, &pool
->free_list
);
445 spin_unlock_irqrestore(&pool
->lock
, flags
);
448 static struct srp_fr_pool
*srp_alloc_fr_pool(struct srp_target_port
*target
)
450 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
452 return srp_create_fr_pool(dev
->dev
, dev
->pd
,
453 target
->scsi_host
->can_queue
,
454 dev
->max_pages_per_mr
);
458 * srp_destroy_qp() - destroy an RDMA queue pair
459 * @ch: SRP RDMA channel.
461 * Change a queue pair into the error state and wait until all receive
462 * completions have been processed before destroying it. This avoids that
463 * the receive completion handler can access the queue pair while it is
466 static void srp_destroy_qp(struct srp_rdma_ch
*ch
)
468 static struct ib_qp_attr attr
= { .qp_state
= IB_QPS_ERR
};
469 static struct ib_recv_wr wr
= { .wr_id
= SRP_LAST_WR_ID
};
470 struct ib_recv_wr
*bad_wr
;
473 /* Destroying a QP and reusing ch->done is only safe if not connected */
474 WARN_ON_ONCE(ch
->connected
);
476 ret
= ib_modify_qp(ch
->qp
, &attr
, IB_QP_STATE
);
477 WARN_ONCE(ret
, "ib_cm_init_qp_attr() returned %d\n", ret
);
481 init_completion(&ch
->done
);
482 ret
= ib_post_recv(ch
->qp
, &wr
, &bad_wr
);
483 WARN_ONCE(ret
, "ib_post_recv() returned %d\n", ret
);
485 wait_for_completion(&ch
->done
);
488 ib_destroy_qp(ch
->qp
);
491 static int srp_create_ch_ib(struct srp_rdma_ch
*ch
)
493 struct srp_target_port
*target
= ch
->target
;
494 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
495 struct ib_qp_init_attr
*init_attr
;
496 struct ib_cq
*recv_cq
, *send_cq
;
498 struct ib_fmr_pool
*fmr_pool
= NULL
;
499 struct srp_fr_pool
*fr_pool
= NULL
;
500 const int m
= 1 + dev
->use_fast_reg
;
501 struct ib_cq_init_attr cq_attr
= {};
504 init_attr
= kzalloc(sizeof *init_attr
, GFP_KERNEL
);
508 /* + 1 for SRP_LAST_WR_ID */
509 cq_attr
.cqe
= target
->queue_size
+ 1;
510 cq_attr
.comp_vector
= ch
->comp_vector
;
511 recv_cq
= ib_create_cq(dev
->dev
, srp_recv_completion
, NULL
, ch
,
513 if (IS_ERR(recv_cq
)) {
514 ret
= PTR_ERR(recv_cq
);
518 cq_attr
.cqe
= m
* target
->queue_size
;
519 cq_attr
.comp_vector
= ch
->comp_vector
;
520 send_cq
= ib_create_cq(dev
->dev
, srp_send_completion
, NULL
, ch
,
522 if (IS_ERR(send_cq
)) {
523 ret
= PTR_ERR(send_cq
);
527 ib_req_notify_cq(recv_cq
, IB_CQ_NEXT_COMP
);
529 init_attr
->event_handler
= srp_qp_event
;
530 init_attr
->cap
.max_send_wr
= m
* target
->queue_size
;
531 init_attr
->cap
.max_recv_wr
= target
->queue_size
+ 1;
532 init_attr
->cap
.max_recv_sge
= 1;
533 init_attr
->cap
.max_send_sge
= 1;
534 init_attr
->sq_sig_type
= IB_SIGNAL_REQ_WR
;
535 init_attr
->qp_type
= IB_QPT_RC
;
536 init_attr
->send_cq
= send_cq
;
537 init_attr
->recv_cq
= recv_cq
;
539 qp
= ib_create_qp(dev
->pd
, init_attr
);
545 ret
= srp_init_qp(target
, qp
);
549 if (dev
->use_fast_reg
) {
550 fr_pool
= srp_alloc_fr_pool(target
);
551 if (IS_ERR(fr_pool
)) {
552 ret
= PTR_ERR(fr_pool
);
553 shost_printk(KERN_WARNING
, target
->scsi_host
, PFX
554 "FR pool allocation failed (%d)\n", ret
);
558 srp_destroy_fr_pool(ch
->fr_pool
);
559 ch
->fr_pool
= fr_pool
;
560 } else if (dev
->use_fmr
) {
561 fmr_pool
= srp_alloc_fmr_pool(target
);
562 if (IS_ERR(fmr_pool
)) {
563 ret
= PTR_ERR(fmr_pool
);
564 shost_printk(KERN_WARNING
, target
->scsi_host
, PFX
565 "FMR pool allocation failed (%d)\n", ret
);
569 ib_destroy_fmr_pool(ch
->fmr_pool
);
570 ch
->fmr_pool
= fmr_pool
;
576 ib_destroy_cq(ch
->recv_cq
);
578 ib_destroy_cq(ch
->send_cq
);
581 ch
->recv_cq
= recv_cq
;
582 ch
->send_cq
= send_cq
;
591 ib_destroy_cq(send_cq
);
594 ib_destroy_cq(recv_cq
);
602 * Note: this function may be called without srp_alloc_iu_bufs() having been
603 * invoked. Hence the ch->[rt]x_ring checks.
605 static void srp_free_ch_ib(struct srp_target_port
*target
,
606 struct srp_rdma_ch
*ch
)
608 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
615 ib_destroy_cm_id(ch
->cm_id
);
619 /* If srp_new_cm_id() succeeded but srp_create_ch_ib() not, return. */
623 if (dev
->use_fast_reg
) {
625 srp_destroy_fr_pool(ch
->fr_pool
);
626 } else if (dev
->use_fmr
) {
628 ib_destroy_fmr_pool(ch
->fmr_pool
);
631 ib_destroy_cq(ch
->send_cq
);
632 ib_destroy_cq(ch
->recv_cq
);
635 * Avoid that the SCSI error handler tries to use this channel after
636 * it has been freed. The SCSI error handler can namely continue
637 * trying to perform recovery actions after scsi_remove_host()
643 ch
->send_cq
= ch
->recv_cq
= NULL
;
646 for (i
= 0; i
< target
->queue_size
; ++i
)
647 srp_free_iu(target
->srp_host
, ch
->rx_ring
[i
]);
652 for (i
= 0; i
< target
->queue_size
; ++i
)
653 srp_free_iu(target
->srp_host
, ch
->tx_ring
[i
]);
659 static void srp_path_rec_completion(int status
,
660 struct ib_sa_path_rec
*pathrec
,
663 struct srp_rdma_ch
*ch
= ch_ptr
;
664 struct srp_target_port
*target
= ch
->target
;
668 shost_printk(KERN_ERR
, target
->scsi_host
,
669 PFX
"Got failed path rec status %d\n", status
);
675 static int srp_lookup_path(struct srp_rdma_ch
*ch
)
677 struct srp_target_port
*target
= ch
->target
;
680 ch
->path
.numb_path
= 1;
682 init_completion(&ch
->done
);
684 ch
->path_query_id
= ib_sa_path_rec_get(&srp_sa_client
,
685 target
->srp_host
->srp_dev
->dev
,
686 target
->srp_host
->port
,
688 IB_SA_PATH_REC_SERVICE_ID
|
689 IB_SA_PATH_REC_DGID
|
690 IB_SA_PATH_REC_SGID
|
691 IB_SA_PATH_REC_NUMB_PATH
|
693 SRP_PATH_REC_TIMEOUT_MS
,
695 srp_path_rec_completion
,
696 ch
, &ch
->path_query
);
697 if (ch
->path_query_id
< 0)
698 return ch
->path_query_id
;
700 ret
= wait_for_completion_interruptible(&ch
->done
);
705 shost_printk(KERN_WARNING
, target
->scsi_host
,
706 PFX
"Path record query failed\n");
711 static int srp_send_req(struct srp_rdma_ch
*ch
, bool multich
)
713 struct srp_target_port
*target
= ch
->target
;
715 struct ib_cm_req_param param
;
716 struct srp_login_req priv
;
720 req
= kzalloc(sizeof *req
, GFP_KERNEL
);
724 req
->param
.primary_path
= &ch
->path
;
725 req
->param
.alternate_path
= NULL
;
726 req
->param
.service_id
= target
->service_id
;
727 req
->param
.qp_num
= ch
->qp
->qp_num
;
728 req
->param
.qp_type
= ch
->qp
->qp_type
;
729 req
->param
.private_data
= &req
->priv
;
730 req
->param
.private_data_len
= sizeof req
->priv
;
731 req
->param
.flow_control
= 1;
733 get_random_bytes(&req
->param
.starting_psn
, 4);
734 req
->param
.starting_psn
&= 0xffffff;
737 * Pick some arbitrary defaults here; we could make these
738 * module parameters if anyone cared about setting them.
740 req
->param
.responder_resources
= 4;
741 req
->param
.remote_cm_response_timeout
= 20;
742 req
->param
.local_cm_response_timeout
= 20;
743 req
->param
.retry_count
= target
->tl_retry_count
;
744 req
->param
.rnr_retry_count
= 7;
745 req
->param
.max_cm_retries
= 15;
747 req
->priv
.opcode
= SRP_LOGIN_REQ
;
749 req
->priv
.req_it_iu_len
= cpu_to_be32(target
->max_iu_len
);
750 req
->priv
.req_buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
|
751 SRP_BUF_FORMAT_INDIRECT
);
752 req
->priv
.req_flags
= (multich
? SRP_MULTICHAN_MULTI
:
753 SRP_MULTICHAN_SINGLE
);
755 * In the published SRP specification (draft rev. 16a), the
756 * port identifier format is 8 bytes of ID extension followed
757 * by 8 bytes of GUID. Older drafts put the two halves in the
758 * opposite order, so that the GUID comes first.
760 * Targets conforming to these obsolete drafts can be
761 * recognized by the I/O Class they report.
763 if (target
->io_class
== SRP_REV10_IB_IO_CLASS
) {
764 memcpy(req
->priv
.initiator_port_id
,
765 &target
->sgid
.global
.interface_id
, 8);
766 memcpy(req
->priv
.initiator_port_id
+ 8,
767 &target
->initiator_ext
, 8);
768 memcpy(req
->priv
.target_port_id
, &target
->ioc_guid
, 8);
769 memcpy(req
->priv
.target_port_id
+ 8, &target
->id_ext
, 8);
771 memcpy(req
->priv
.initiator_port_id
,
772 &target
->initiator_ext
, 8);
773 memcpy(req
->priv
.initiator_port_id
+ 8,
774 &target
->sgid
.global
.interface_id
, 8);
775 memcpy(req
->priv
.target_port_id
, &target
->id_ext
, 8);
776 memcpy(req
->priv
.target_port_id
+ 8, &target
->ioc_guid
, 8);
780 * Topspin/Cisco SRP targets will reject our login unless we
781 * zero out the first 8 bytes of our initiator port ID and set
782 * the second 8 bytes to the local node GUID.
784 if (srp_target_is_topspin(target
)) {
785 shost_printk(KERN_DEBUG
, target
->scsi_host
,
786 PFX
"Topspin/Cisco initiator port ID workaround "
787 "activated for target GUID %016llx\n",
788 be64_to_cpu(target
->ioc_guid
));
789 memset(req
->priv
.initiator_port_id
, 0, 8);
790 memcpy(req
->priv
.initiator_port_id
+ 8,
791 &target
->srp_host
->srp_dev
->dev
->node_guid
, 8);
794 status
= ib_send_cm_req(ch
->cm_id
, &req
->param
);
801 static bool srp_queue_remove_work(struct srp_target_port
*target
)
803 bool changed
= false;
805 spin_lock_irq(&target
->lock
);
806 if (target
->state
!= SRP_TARGET_REMOVED
) {
807 target
->state
= SRP_TARGET_REMOVED
;
810 spin_unlock_irq(&target
->lock
);
813 queue_work(srp_remove_wq
, &target
->remove_work
);
818 static void srp_disconnect_target(struct srp_target_port
*target
)
820 struct srp_rdma_ch
*ch
;
823 /* XXX should send SRP_I_LOGOUT request */
825 for (i
= 0; i
< target
->ch_count
; i
++) {
827 ch
->connected
= false;
828 if (ch
->cm_id
&& ib_send_cm_dreq(ch
->cm_id
, NULL
, 0)) {
829 shost_printk(KERN_DEBUG
, target
->scsi_host
,
830 PFX
"Sending CM DREQ failed\n");
835 static void srp_free_req_data(struct srp_target_port
*target
,
836 struct srp_rdma_ch
*ch
)
838 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
839 struct ib_device
*ibdev
= dev
->dev
;
840 struct srp_request
*req
;
846 for (i
= 0; i
< target
->req_ring_size
; ++i
) {
847 req
= &ch
->req_ring
[i
];
848 if (dev
->use_fast_reg
)
851 kfree(req
->fmr_list
);
852 kfree(req
->map_page
);
853 if (req
->indirect_dma_addr
) {
854 ib_dma_unmap_single(ibdev
, req
->indirect_dma_addr
,
855 target
->indirect_size
,
858 kfree(req
->indirect_desc
);
865 static int srp_alloc_req_data(struct srp_rdma_ch
*ch
)
867 struct srp_target_port
*target
= ch
->target
;
868 struct srp_device
*srp_dev
= target
->srp_host
->srp_dev
;
869 struct ib_device
*ibdev
= srp_dev
->dev
;
870 struct srp_request
*req
;
873 int i
, ret
= -ENOMEM
;
875 ch
->req_ring
= kcalloc(target
->req_ring_size
, sizeof(*ch
->req_ring
),
880 for (i
= 0; i
< target
->req_ring_size
; ++i
) {
881 req
= &ch
->req_ring
[i
];
882 mr_list
= kmalloc(target
->cmd_sg_cnt
* sizeof(void *),
886 if (srp_dev
->use_fast_reg
)
887 req
->fr_list
= mr_list
;
889 req
->fmr_list
= mr_list
;
890 req
->map_page
= kmalloc(srp_dev
->max_pages_per_mr
*
891 sizeof(void *), GFP_KERNEL
);
894 req
->indirect_desc
= kmalloc(target
->indirect_size
, GFP_KERNEL
);
895 if (!req
->indirect_desc
)
898 dma_addr
= ib_dma_map_single(ibdev
, req
->indirect_desc
,
899 target
->indirect_size
,
901 if (ib_dma_mapping_error(ibdev
, dma_addr
))
904 req
->indirect_dma_addr
= dma_addr
;
913 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
914 * @shost: SCSI host whose attributes to remove from sysfs.
916 * Note: Any attributes defined in the host template and that did not exist
917 * before invocation of this function will be ignored.
919 static void srp_del_scsi_host_attr(struct Scsi_Host
*shost
)
921 struct device_attribute
**attr
;
923 for (attr
= shost
->hostt
->shost_attrs
; attr
&& *attr
; ++attr
)
924 device_remove_file(&shost
->shost_dev
, *attr
);
927 static void srp_remove_target(struct srp_target_port
*target
)
929 struct srp_rdma_ch
*ch
;
932 WARN_ON_ONCE(target
->state
!= SRP_TARGET_REMOVED
);
934 srp_del_scsi_host_attr(target
->scsi_host
);
935 srp_rport_get(target
->rport
);
936 srp_remove_host(target
->scsi_host
);
937 scsi_remove_host(target
->scsi_host
);
938 srp_stop_rport_timers(target
->rport
);
939 srp_disconnect_target(target
);
940 for (i
= 0; i
< target
->ch_count
; i
++) {
942 srp_free_ch_ib(target
, ch
);
944 cancel_work_sync(&target
->tl_err_work
);
945 srp_rport_put(target
->rport
);
946 for (i
= 0; i
< target
->ch_count
; i
++) {
948 srp_free_req_data(target
, ch
);
953 spin_lock(&target
->srp_host
->target_lock
);
954 list_del(&target
->list
);
955 spin_unlock(&target
->srp_host
->target_lock
);
957 scsi_host_put(target
->scsi_host
);
960 static void srp_remove_work(struct work_struct
*work
)
962 struct srp_target_port
*target
=
963 container_of(work
, struct srp_target_port
, remove_work
);
965 WARN_ON_ONCE(target
->state
!= SRP_TARGET_REMOVED
);
967 srp_remove_target(target
);
970 static void srp_rport_delete(struct srp_rport
*rport
)
972 struct srp_target_port
*target
= rport
->lld_data
;
974 srp_queue_remove_work(target
);
978 * srp_connected_ch() - number of connected channels
979 * @target: SRP target port.
981 static int srp_connected_ch(struct srp_target_port
*target
)
985 for (i
= 0; i
< target
->ch_count
; i
++)
986 c
+= target
->ch
[i
].connected
;
991 static int srp_connect_ch(struct srp_rdma_ch
*ch
, bool multich
)
993 struct srp_target_port
*target
= ch
->target
;
996 WARN_ON_ONCE(!multich
&& srp_connected_ch(target
) > 0);
998 ret
= srp_lookup_path(ch
);
1003 init_completion(&ch
->done
);
1004 ret
= srp_send_req(ch
, multich
);
1007 ret
= wait_for_completion_interruptible(&ch
->done
);
1012 * The CM event handling code will set status to
1013 * SRP_PORT_REDIRECT if we get a port redirect REJ
1014 * back, or SRP_DLID_REDIRECT if we get a lid/qp
1015 * redirect REJ back.
1017 switch (ch
->status
) {
1019 ch
->connected
= true;
1022 case SRP_PORT_REDIRECT
:
1023 ret
= srp_lookup_path(ch
);
1028 case SRP_DLID_REDIRECT
:
1031 case SRP_STALE_CONN
:
1032 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1033 "giving up on stale connection\n");
1034 ch
->status
= -ECONNRESET
;
1043 static int srp_inv_rkey(struct srp_rdma_ch
*ch
, u32 rkey
)
1045 struct ib_send_wr
*bad_wr
;
1046 struct ib_send_wr wr
= {
1047 .opcode
= IB_WR_LOCAL_INV
,
1048 .wr_id
= LOCAL_INV_WR_ID_MASK
,
1052 .ex
.invalidate_rkey
= rkey
,
1055 return ib_post_send(ch
->qp
, &wr
, &bad_wr
);
1058 static void srp_unmap_data(struct scsi_cmnd
*scmnd
,
1059 struct srp_rdma_ch
*ch
,
1060 struct srp_request
*req
)
1062 struct srp_target_port
*target
= ch
->target
;
1063 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
1064 struct ib_device
*ibdev
= dev
->dev
;
1067 if (!scsi_sglist(scmnd
) ||
1068 (scmnd
->sc_data_direction
!= DMA_TO_DEVICE
&&
1069 scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
))
1072 if (dev
->use_fast_reg
) {
1073 struct srp_fr_desc
**pfr
;
1075 for (i
= req
->nmdesc
, pfr
= req
->fr_list
; i
> 0; i
--, pfr
++) {
1076 res
= srp_inv_rkey(ch
, (*pfr
)->mr
->rkey
);
1078 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1079 "Queueing INV WR for rkey %#x failed (%d)\n",
1080 (*pfr
)->mr
->rkey
, res
);
1081 queue_work(system_long_wq
,
1082 &target
->tl_err_work
);
1086 srp_fr_pool_put(ch
->fr_pool
, req
->fr_list
,
1088 } else if (dev
->use_fmr
) {
1089 struct ib_pool_fmr
**pfmr
;
1091 for (i
= req
->nmdesc
, pfmr
= req
->fmr_list
; i
> 0; i
--, pfmr
++)
1092 ib_fmr_pool_unmap(*pfmr
);
1095 ib_dma_unmap_sg(ibdev
, scsi_sglist(scmnd
), scsi_sg_count(scmnd
),
1096 scmnd
->sc_data_direction
);
1100 * srp_claim_req - Take ownership of the scmnd associated with a request.
1101 * @ch: SRP RDMA channel.
1102 * @req: SRP request.
1103 * @sdev: If not NULL, only take ownership for this SCSI device.
1104 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
1105 * ownership of @req->scmnd if it equals @scmnd.
1108 * Either NULL or a pointer to the SCSI command the caller became owner of.
1110 static struct scsi_cmnd
*srp_claim_req(struct srp_rdma_ch
*ch
,
1111 struct srp_request
*req
,
1112 struct scsi_device
*sdev
,
1113 struct scsi_cmnd
*scmnd
)
1115 unsigned long flags
;
1117 spin_lock_irqsave(&ch
->lock
, flags
);
1119 (!sdev
|| req
->scmnd
->device
== sdev
) &&
1120 (!scmnd
|| req
->scmnd
== scmnd
)) {
1126 spin_unlock_irqrestore(&ch
->lock
, flags
);
1132 * srp_free_req() - Unmap data and add request to the free request list.
1133 * @ch: SRP RDMA channel.
1134 * @req: Request to be freed.
1135 * @scmnd: SCSI command associated with @req.
1136 * @req_lim_delta: Amount to be added to @target->req_lim.
1138 static void srp_free_req(struct srp_rdma_ch
*ch
, struct srp_request
*req
,
1139 struct scsi_cmnd
*scmnd
, s32 req_lim_delta
)
1141 unsigned long flags
;
1143 srp_unmap_data(scmnd
, ch
, req
);
1145 spin_lock_irqsave(&ch
->lock
, flags
);
1146 ch
->req_lim
+= req_lim_delta
;
1147 spin_unlock_irqrestore(&ch
->lock
, flags
);
1150 static void srp_finish_req(struct srp_rdma_ch
*ch
, struct srp_request
*req
,
1151 struct scsi_device
*sdev
, int result
)
1153 struct scsi_cmnd
*scmnd
= srp_claim_req(ch
, req
, sdev
, NULL
);
1156 srp_free_req(ch
, req
, scmnd
, 0);
1157 scmnd
->result
= result
;
1158 scmnd
->scsi_done(scmnd
);
1162 static void srp_terminate_io(struct srp_rport
*rport
)
1164 struct srp_target_port
*target
= rport
->lld_data
;
1165 struct srp_rdma_ch
*ch
;
1166 struct Scsi_Host
*shost
= target
->scsi_host
;
1167 struct scsi_device
*sdev
;
1171 * Invoking srp_terminate_io() while srp_queuecommand() is running
1172 * is not safe. Hence the warning statement below.
1174 shost_for_each_device(sdev
, shost
)
1175 WARN_ON_ONCE(sdev
->request_queue
->request_fn_active
);
1177 for (i
= 0; i
< target
->ch_count
; i
++) {
1178 ch
= &target
->ch
[i
];
1180 for (j
= 0; j
< target
->req_ring_size
; ++j
) {
1181 struct srp_request
*req
= &ch
->req_ring
[j
];
1183 srp_finish_req(ch
, req
, NULL
,
1184 DID_TRANSPORT_FAILFAST
<< 16);
1190 * It is up to the caller to ensure that srp_rport_reconnect() calls are
1191 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
1192 * srp_reset_device() or srp_reset_host() calls will occur while this function
1193 * is in progress. One way to realize that is not to call this function
1194 * directly but to call srp_reconnect_rport() instead since that last function
1195 * serializes calls of this function via rport->mutex and also blocks
1196 * srp_queuecommand() calls before invoking this function.
1198 static int srp_rport_reconnect(struct srp_rport
*rport
)
1200 struct srp_target_port
*target
= rport
->lld_data
;
1201 struct srp_rdma_ch
*ch
;
1203 bool multich
= false;
1205 srp_disconnect_target(target
);
1207 if (target
->state
== SRP_TARGET_SCANNING
)
1211 * Now get a new local CM ID so that we avoid confusing the target in
1212 * case things are really fouled up. Doing so also ensures that all CM
1213 * callbacks will have finished before a new QP is allocated.
1215 for (i
= 0; i
< target
->ch_count
; i
++) {
1216 ch
= &target
->ch
[i
];
1217 ret
+= srp_new_cm_id(ch
);
1219 for (i
= 0; i
< target
->ch_count
; i
++) {
1220 ch
= &target
->ch
[i
];
1221 for (j
= 0; j
< target
->req_ring_size
; ++j
) {
1222 struct srp_request
*req
= &ch
->req_ring
[j
];
1224 srp_finish_req(ch
, req
, NULL
, DID_RESET
<< 16);
1227 for (i
= 0; i
< target
->ch_count
; i
++) {
1228 ch
= &target
->ch
[i
];
1230 * Whether or not creating a new CM ID succeeded, create a new
1231 * QP. This guarantees that all completion callback function
1232 * invocations have finished before request resetting starts.
1234 ret
+= srp_create_ch_ib(ch
);
1236 INIT_LIST_HEAD(&ch
->free_tx
);
1237 for (j
= 0; j
< target
->queue_size
; ++j
)
1238 list_add(&ch
->tx_ring
[j
]->list
, &ch
->free_tx
);
1241 target
->qp_in_error
= false;
1243 for (i
= 0; i
< target
->ch_count
; i
++) {
1244 ch
= &target
->ch
[i
];
1247 ret
= srp_connect_ch(ch
, multich
);
1252 shost_printk(KERN_INFO
, target
->scsi_host
,
1253 PFX
"reconnect succeeded\n");
1258 static void srp_map_desc(struct srp_map_state
*state
, dma_addr_t dma_addr
,
1259 unsigned int dma_len
, u32 rkey
)
1261 struct srp_direct_buf
*desc
= state
->desc
;
1263 WARN_ON_ONCE(!dma_len
);
1265 desc
->va
= cpu_to_be64(dma_addr
);
1266 desc
->key
= cpu_to_be32(rkey
);
1267 desc
->len
= cpu_to_be32(dma_len
);
1269 state
->total_len
+= dma_len
;
1274 static int srp_map_finish_fmr(struct srp_map_state
*state
,
1275 struct srp_rdma_ch
*ch
)
1277 struct srp_target_port
*target
= ch
->target
;
1278 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
1279 struct ib_pool_fmr
*fmr
;
1282 if (state
->fmr
.next
>= state
->fmr
.end
)
1285 fmr
= ib_fmr_pool_map_phys(ch
->fmr_pool
, state
->pages
,
1286 state
->npages
, io_addr
);
1288 return PTR_ERR(fmr
);
1290 *state
->fmr
.next
++ = fmr
;
1293 srp_map_desc(state
, state
->base_dma_addr
& ~dev
->mr_page_mask
,
1294 state
->dma_len
, fmr
->fmr
->rkey
);
1299 static int srp_map_finish_fr(struct srp_map_state
*state
,
1300 struct srp_rdma_ch
*ch
)
1302 struct srp_target_port
*target
= ch
->target
;
1303 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
1304 struct ib_send_wr
*bad_wr
;
1305 struct ib_send_wr wr
;
1306 struct srp_fr_desc
*desc
;
1309 if (state
->fr
.next
>= state
->fr
.end
)
1312 desc
= srp_fr_pool_get(ch
->fr_pool
);
1316 rkey
= ib_inc_rkey(desc
->mr
->rkey
);
1317 ib_update_fast_reg_key(desc
->mr
, rkey
);
1319 memcpy(desc
->frpl
->page_list
, state
->pages
,
1320 sizeof(state
->pages
[0]) * state
->npages
);
1322 memset(&wr
, 0, sizeof(wr
));
1323 wr
.opcode
= IB_WR_FAST_REG_MR
;
1324 wr
.wr_id
= FAST_REG_WR_ID_MASK
;
1325 wr
.wr
.fast_reg
.iova_start
= state
->base_dma_addr
;
1326 wr
.wr
.fast_reg
.page_list
= desc
->frpl
;
1327 wr
.wr
.fast_reg
.page_list_len
= state
->npages
;
1328 wr
.wr
.fast_reg
.page_shift
= ilog2(dev
->mr_page_size
);
1329 wr
.wr
.fast_reg
.length
= state
->dma_len
;
1330 wr
.wr
.fast_reg
.access_flags
= (IB_ACCESS_LOCAL_WRITE
|
1331 IB_ACCESS_REMOTE_READ
|
1332 IB_ACCESS_REMOTE_WRITE
);
1333 wr
.wr
.fast_reg
.rkey
= desc
->mr
->lkey
;
1335 *state
->fr
.next
++ = desc
;
1338 srp_map_desc(state
, state
->base_dma_addr
, state
->dma_len
,
1341 return ib_post_send(ch
->qp
, &wr
, &bad_wr
);
1344 static int srp_finish_mapping(struct srp_map_state
*state
,
1345 struct srp_rdma_ch
*ch
)
1347 struct srp_target_port
*target
= ch
->target
;
1348 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
1351 WARN_ON_ONCE(!dev
->use_fast_reg
&& !dev
->use_fmr
);
1353 if (state
->npages
== 0)
1356 if (state
->npages
== 1 && !register_always
)
1357 srp_map_desc(state
, state
->base_dma_addr
, state
->dma_len
,
1360 ret
= dev
->use_fast_reg
? srp_map_finish_fr(state
, ch
) :
1361 srp_map_finish_fmr(state
, ch
);
1371 static int srp_map_sg_entry(struct srp_map_state
*state
,
1372 struct srp_rdma_ch
*ch
,
1373 struct scatterlist
*sg
, int sg_index
)
1375 struct srp_target_port
*target
= ch
->target
;
1376 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
1377 struct ib_device
*ibdev
= dev
->dev
;
1378 dma_addr_t dma_addr
= ib_sg_dma_address(ibdev
, sg
);
1379 unsigned int dma_len
= ib_sg_dma_len(ibdev
, sg
);
1380 unsigned int len
= 0;
1383 WARN_ON_ONCE(!dma_len
);
1386 unsigned offset
= dma_addr
& ~dev
->mr_page_mask
;
1387 if (state
->npages
== dev
->max_pages_per_mr
|| offset
!= 0) {
1388 ret
= srp_finish_mapping(state
, ch
);
1393 len
= min_t(unsigned int, dma_len
, dev
->mr_page_size
- offset
);
1396 state
->base_dma_addr
= dma_addr
;
1397 state
->pages
[state
->npages
++] = dma_addr
& dev
->mr_page_mask
;
1398 state
->dma_len
+= len
;
1404 * If the last entry of the MR wasn't a full page, then we need to
1405 * close it out and start a new one -- we can only merge at page
1409 if (len
!= dev
->mr_page_size
)
1410 ret
= srp_finish_mapping(state
, ch
);
1414 static int srp_map_sg(struct srp_map_state
*state
, struct srp_rdma_ch
*ch
,
1415 struct srp_request
*req
, struct scatterlist
*scat
,
1418 struct srp_target_port
*target
= ch
->target
;
1419 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
1420 struct scatterlist
*sg
;
1423 state
->desc
= req
->indirect_desc
;
1424 state
->pages
= req
->map_page
;
1425 if (dev
->use_fast_reg
) {
1426 state
->fr
.next
= req
->fr_list
;
1427 state
->fr
.end
= req
->fr_list
+ target
->cmd_sg_cnt
;
1428 } else if (dev
->use_fmr
) {
1429 state
->fmr
.next
= req
->fmr_list
;
1430 state
->fmr
.end
= req
->fmr_list
+ target
->cmd_sg_cnt
;
1433 if (dev
->use_fast_reg
|| dev
->use_fmr
) {
1434 for_each_sg(scat
, sg
, count
, i
) {
1435 ret
= srp_map_sg_entry(state
, ch
, sg
, i
);
1439 ret
= srp_finish_mapping(state
, ch
);
1443 for_each_sg(scat
, sg
, count
, i
) {
1444 srp_map_desc(state
, ib_sg_dma_address(dev
->dev
, sg
),
1445 ib_sg_dma_len(dev
->dev
, sg
), target
->rkey
);
1449 req
->nmdesc
= state
->nmdesc
;
1456 static int srp_map_data(struct scsi_cmnd
*scmnd
, struct srp_rdma_ch
*ch
,
1457 struct srp_request
*req
)
1459 struct srp_target_port
*target
= ch
->target
;
1460 struct scatterlist
*scat
;
1461 struct srp_cmd
*cmd
= req
->cmd
->buf
;
1462 int len
, nents
, count
;
1463 struct srp_device
*dev
;
1464 struct ib_device
*ibdev
;
1465 struct srp_map_state state
;
1466 struct srp_indirect_buf
*indirect_hdr
;
1470 if (!scsi_sglist(scmnd
) || scmnd
->sc_data_direction
== DMA_NONE
)
1471 return sizeof (struct srp_cmd
);
1473 if (scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
&&
1474 scmnd
->sc_data_direction
!= DMA_TO_DEVICE
) {
1475 shost_printk(KERN_WARNING
, target
->scsi_host
,
1476 PFX
"Unhandled data direction %d\n",
1477 scmnd
->sc_data_direction
);
1481 nents
= scsi_sg_count(scmnd
);
1482 scat
= scsi_sglist(scmnd
);
1484 dev
= target
->srp_host
->srp_dev
;
1487 count
= ib_dma_map_sg(ibdev
, scat
, nents
, scmnd
->sc_data_direction
);
1488 if (unlikely(count
== 0))
1491 fmt
= SRP_DATA_DESC_DIRECT
;
1492 len
= sizeof (struct srp_cmd
) + sizeof (struct srp_direct_buf
);
1494 if (count
== 1 && !register_always
) {
1496 * The midlayer only generated a single gather/scatter
1497 * entry, or DMA mapping coalesced everything to a
1498 * single entry. So a direct descriptor along with
1499 * the DMA MR suffices.
1501 struct srp_direct_buf
*buf
= (void *) cmd
->add_data
;
1503 buf
->va
= cpu_to_be64(ib_sg_dma_address(ibdev
, scat
));
1504 buf
->key
= cpu_to_be32(target
->rkey
);
1505 buf
->len
= cpu_to_be32(ib_sg_dma_len(ibdev
, scat
));
1512 * We have more than one scatter/gather entry, so build our indirect
1513 * descriptor table, trying to merge as many entries as we can.
1515 indirect_hdr
= (void *) cmd
->add_data
;
1517 ib_dma_sync_single_for_cpu(ibdev
, req
->indirect_dma_addr
,
1518 target
->indirect_size
, DMA_TO_DEVICE
);
1520 memset(&state
, 0, sizeof(state
));
1521 srp_map_sg(&state
, ch
, req
, scat
, count
);
1523 /* We've mapped the request, now pull as much of the indirect
1524 * descriptor table as we can into the command buffer. If this
1525 * target is not using an external indirect table, we are
1526 * guaranteed to fit into the command, as the SCSI layer won't
1527 * give us more S/G entries than we allow.
1529 if (state
.ndesc
== 1) {
1531 * Memory registration collapsed the sg-list into one entry,
1532 * so use a direct descriptor.
1534 struct srp_direct_buf
*buf
= (void *) cmd
->add_data
;
1536 *buf
= req
->indirect_desc
[0];
1540 if (unlikely(target
->cmd_sg_cnt
< state
.ndesc
&&
1541 !target
->allow_ext_sg
)) {
1542 shost_printk(KERN_ERR
, target
->scsi_host
,
1543 "Could not fit S/G list into SRP_CMD\n");
1547 count
= min(state
.ndesc
, target
->cmd_sg_cnt
);
1548 table_len
= state
.ndesc
* sizeof (struct srp_direct_buf
);
1550 fmt
= SRP_DATA_DESC_INDIRECT
;
1551 len
= sizeof(struct srp_cmd
) + sizeof (struct srp_indirect_buf
);
1552 len
+= count
* sizeof (struct srp_direct_buf
);
1554 memcpy(indirect_hdr
->desc_list
, req
->indirect_desc
,
1555 count
* sizeof (struct srp_direct_buf
));
1557 indirect_hdr
->table_desc
.va
= cpu_to_be64(req
->indirect_dma_addr
);
1558 indirect_hdr
->table_desc
.key
= cpu_to_be32(target
->rkey
);
1559 indirect_hdr
->table_desc
.len
= cpu_to_be32(table_len
);
1560 indirect_hdr
->len
= cpu_to_be32(state
.total_len
);
1562 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
1563 cmd
->data_out_desc_cnt
= count
;
1565 cmd
->data_in_desc_cnt
= count
;
1567 ib_dma_sync_single_for_device(ibdev
, req
->indirect_dma_addr
, table_len
,
1571 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
1572 cmd
->buf_fmt
= fmt
<< 4;
1580 * Return an IU and possible credit to the free pool
1582 static void srp_put_tx_iu(struct srp_rdma_ch
*ch
, struct srp_iu
*iu
,
1583 enum srp_iu_type iu_type
)
1585 unsigned long flags
;
1587 spin_lock_irqsave(&ch
->lock
, flags
);
1588 list_add(&iu
->list
, &ch
->free_tx
);
1589 if (iu_type
!= SRP_IU_RSP
)
1591 spin_unlock_irqrestore(&ch
->lock
, flags
);
1595 * Must be called with ch->lock held to protect req_lim and free_tx.
1596 * If IU is not sent, it must be returned using srp_put_tx_iu().
1599 * An upper limit for the number of allocated information units for each
1601 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1602 * more than Scsi_Host.can_queue requests.
1603 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1604 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1605 * one unanswered SRP request to an initiator.
1607 static struct srp_iu
*__srp_get_tx_iu(struct srp_rdma_ch
*ch
,
1608 enum srp_iu_type iu_type
)
1610 struct srp_target_port
*target
= ch
->target
;
1611 s32 rsv
= (iu_type
== SRP_IU_TSK_MGMT
) ? 0 : SRP_TSK_MGMT_SQ_SIZE
;
1614 srp_send_completion(ch
->send_cq
, ch
);
1616 if (list_empty(&ch
->free_tx
))
1619 /* Initiator responses to target requests do not consume credits */
1620 if (iu_type
!= SRP_IU_RSP
) {
1621 if (ch
->req_lim
<= rsv
) {
1622 ++target
->zero_req_lim
;
1629 iu
= list_first_entry(&ch
->free_tx
, struct srp_iu
, list
);
1630 list_del(&iu
->list
);
1634 static int srp_post_send(struct srp_rdma_ch
*ch
, struct srp_iu
*iu
, int len
)
1636 struct srp_target_port
*target
= ch
->target
;
1638 struct ib_send_wr wr
, *bad_wr
;
1640 list
.addr
= iu
->dma
;
1642 list
.lkey
= target
->lkey
;
1645 wr
.wr_id
= (uintptr_t) iu
;
1648 wr
.opcode
= IB_WR_SEND
;
1649 wr
.send_flags
= IB_SEND_SIGNALED
;
1651 return ib_post_send(ch
->qp
, &wr
, &bad_wr
);
1654 static int srp_post_recv(struct srp_rdma_ch
*ch
, struct srp_iu
*iu
)
1656 struct srp_target_port
*target
= ch
->target
;
1657 struct ib_recv_wr wr
, *bad_wr
;
1660 list
.addr
= iu
->dma
;
1661 list
.length
= iu
->size
;
1662 list
.lkey
= target
->lkey
;
1665 wr
.wr_id
= (uintptr_t) iu
;
1669 return ib_post_recv(ch
->qp
, &wr
, &bad_wr
);
1672 static void srp_process_rsp(struct srp_rdma_ch
*ch
, struct srp_rsp
*rsp
)
1674 struct srp_target_port
*target
= ch
->target
;
1675 struct srp_request
*req
;
1676 struct scsi_cmnd
*scmnd
;
1677 unsigned long flags
;
1679 if (unlikely(rsp
->tag
& SRP_TAG_TSK_MGMT
)) {
1680 spin_lock_irqsave(&ch
->lock
, flags
);
1681 ch
->req_lim
+= be32_to_cpu(rsp
->req_lim_delta
);
1682 spin_unlock_irqrestore(&ch
->lock
, flags
);
1684 ch
->tsk_mgmt_status
= -1;
1685 if (be32_to_cpu(rsp
->resp_data_len
) >= 4)
1686 ch
->tsk_mgmt_status
= rsp
->data
[3];
1687 complete(&ch
->tsk_mgmt_done
);
1689 scmnd
= scsi_host_find_tag(target
->scsi_host
, rsp
->tag
);
1691 req
= (void *)scmnd
->host_scribble
;
1692 scmnd
= srp_claim_req(ch
, req
, NULL
, scmnd
);
1695 shost_printk(KERN_ERR
, target
->scsi_host
,
1696 "Null scmnd for RSP w/tag %#016llx received on ch %td / QP %#x\n",
1697 rsp
->tag
, ch
- target
->ch
, ch
->qp
->qp_num
);
1699 spin_lock_irqsave(&ch
->lock
, flags
);
1700 ch
->req_lim
+= be32_to_cpu(rsp
->req_lim_delta
);
1701 spin_unlock_irqrestore(&ch
->lock
, flags
);
1705 scmnd
->result
= rsp
->status
;
1707 if (rsp
->flags
& SRP_RSP_FLAG_SNSVALID
) {
1708 memcpy(scmnd
->sense_buffer
, rsp
->data
+
1709 be32_to_cpu(rsp
->resp_data_len
),
1710 min_t(int, be32_to_cpu(rsp
->sense_data_len
),
1711 SCSI_SENSE_BUFFERSIZE
));
1714 if (unlikely(rsp
->flags
& SRP_RSP_FLAG_DIUNDER
))
1715 scsi_set_resid(scmnd
, be32_to_cpu(rsp
->data_in_res_cnt
));
1716 else if (unlikely(rsp
->flags
& SRP_RSP_FLAG_DIOVER
))
1717 scsi_set_resid(scmnd
, -be32_to_cpu(rsp
->data_in_res_cnt
));
1718 else if (unlikely(rsp
->flags
& SRP_RSP_FLAG_DOUNDER
))
1719 scsi_set_resid(scmnd
, be32_to_cpu(rsp
->data_out_res_cnt
));
1720 else if (unlikely(rsp
->flags
& SRP_RSP_FLAG_DOOVER
))
1721 scsi_set_resid(scmnd
, -be32_to_cpu(rsp
->data_out_res_cnt
));
1723 srp_free_req(ch
, req
, scmnd
,
1724 be32_to_cpu(rsp
->req_lim_delta
));
1726 scmnd
->host_scribble
= NULL
;
1727 scmnd
->scsi_done(scmnd
);
1731 static int srp_response_common(struct srp_rdma_ch
*ch
, s32 req_delta
,
1734 struct srp_target_port
*target
= ch
->target
;
1735 struct ib_device
*dev
= target
->srp_host
->srp_dev
->dev
;
1736 unsigned long flags
;
1740 spin_lock_irqsave(&ch
->lock
, flags
);
1741 ch
->req_lim
+= req_delta
;
1742 iu
= __srp_get_tx_iu(ch
, SRP_IU_RSP
);
1743 spin_unlock_irqrestore(&ch
->lock
, flags
);
1746 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1747 "no IU available to send response\n");
1751 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, len
, DMA_TO_DEVICE
);
1752 memcpy(iu
->buf
, rsp
, len
);
1753 ib_dma_sync_single_for_device(dev
, iu
->dma
, len
, DMA_TO_DEVICE
);
1755 err
= srp_post_send(ch
, iu
, len
);
1757 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1758 "unable to post response: %d\n", err
);
1759 srp_put_tx_iu(ch
, iu
, SRP_IU_RSP
);
1765 static void srp_process_cred_req(struct srp_rdma_ch
*ch
,
1766 struct srp_cred_req
*req
)
1768 struct srp_cred_rsp rsp
= {
1769 .opcode
= SRP_CRED_RSP
,
1772 s32 delta
= be32_to_cpu(req
->req_lim_delta
);
1774 if (srp_response_common(ch
, delta
, &rsp
, sizeof(rsp
)))
1775 shost_printk(KERN_ERR
, ch
->target
->scsi_host
, PFX
1776 "problems processing SRP_CRED_REQ\n");
1779 static void srp_process_aer_req(struct srp_rdma_ch
*ch
,
1780 struct srp_aer_req
*req
)
1782 struct srp_target_port
*target
= ch
->target
;
1783 struct srp_aer_rsp rsp
= {
1784 .opcode
= SRP_AER_RSP
,
1787 s32 delta
= be32_to_cpu(req
->req_lim_delta
);
1789 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1790 "ignoring AER for LUN %llu\n", scsilun_to_int(&req
->lun
));
1792 if (srp_response_common(ch
, delta
, &rsp
, sizeof(rsp
)))
1793 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1794 "problems processing SRP_AER_REQ\n");
1797 static void srp_handle_recv(struct srp_rdma_ch
*ch
, struct ib_wc
*wc
)
1799 struct srp_target_port
*target
= ch
->target
;
1800 struct ib_device
*dev
= target
->srp_host
->srp_dev
->dev
;
1801 struct srp_iu
*iu
= (struct srp_iu
*) (uintptr_t) wc
->wr_id
;
1805 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, ch
->max_ti_iu_len
,
1808 opcode
= *(u8
*) iu
->buf
;
1811 shost_printk(KERN_ERR
, target
->scsi_host
,
1812 PFX
"recv completion, opcode 0x%02x\n", opcode
);
1813 print_hex_dump(KERN_ERR
, "", DUMP_PREFIX_OFFSET
, 8, 1,
1814 iu
->buf
, wc
->byte_len
, true);
1819 srp_process_rsp(ch
, iu
->buf
);
1823 srp_process_cred_req(ch
, iu
->buf
);
1827 srp_process_aer_req(ch
, iu
->buf
);
1831 /* XXX Handle target logout */
1832 shost_printk(KERN_WARNING
, target
->scsi_host
,
1833 PFX
"Got target logout request\n");
1837 shost_printk(KERN_WARNING
, target
->scsi_host
,
1838 PFX
"Unhandled SRP opcode 0x%02x\n", opcode
);
1842 ib_dma_sync_single_for_device(dev
, iu
->dma
, ch
->max_ti_iu_len
,
1845 res
= srp_post_recv(ch
, iu
);
1847 shost_printk(KERN_ERR
, target
->scsi_host
,
1848 PFX
"Recv failed with error code %d\n", res
);
1852 * srp_tl_err_work() - handle a transport layer error
1853 * @work: Work structure embedded in an SRP target port.
1855 * Note: This function may get invoked before the rport has been created,
1856 * hence the target->rport test.
1858 static void srp_tl_err_work(struct work_struct
*work
)
1860 struct srp_target_port
*target
;
1862 target
= container_of(work
, struct srp_target_port
, tl_err_work
);
1864 srp_start_tl_fail_timers(target
->rport
);
1867 static void srp_handle_qp_err(u64 wr_id
, enum ib_wc_status wc_status
,
1868 bool send_err
, struct srp_rdma_ch
*ch
)
1870 struct srp_target_port
*target
= ch
->target
;
1872 if (wr_id
== SRP_LAST_WR_ID
) {
1873 complete(&ch
->done
);
1877 if (ch
->connected
&& !target
->qp_in_error
) {
1878 if (wr_id
& LOCAL_INV_WR_ID_MASK
) {
1879 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1880 "LOCAL_INV failed with status %s (%d)\n",
1881 ib_wc_status_msg(wc_status
), wc_status
);
1882 } else if (wr_id
& FAST_REG_WR_ID_MASK
) {
1883 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1884 "FAST_REG_MR failed status %s (%d)\n",
1885 ib_wc_status_msg(wc_status
), wc_status
);
1887 shost_printk(KERN_ERR
, target
->scsi_host
,
1888 PFX
"failed %s status %s (%d) for iu %p\n",
1889 send_err
? "send" : "receive",
1890 ib_wc_status_msg(wc_status
), wc_status
,
1891 (void *)(uintptr_t)wr_id
);
1893 queue_work(system_long_wq
, &target
->tl_err_work
);
1895 target
->qp_in_error
= true;
1898 static void srp_recv_completion(struct ib_cq
*cq
, void *ch_ptr
)
1900 struct srp_rdma_ch
*ch
= ch_ptr
;
1903 ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
1904 while (ib_poll_cq(cq
, 1, &wc
) > 0) {
1905 if (likely(wc
.status
== IB_WC_SUCCESS
)) {
1906 srp_handle_recv(ch
, &wc
);
1908 srp_handle_qp_err(wc
.wr_id
, wc
.status
, false, ch
);
1913 static void srp_send_completion(struct ib_cq
*cq
, void *ch_ptr
)
1915 struct srp_rdma_ch
*ch
= ch_ptr
;
1919 while (ib_poll_cq(cq
, 1, &wc
) > 0) {
1920 if (likely(wc
.status
== IB_WC_SUCCESS
)) {
1921 iu
= (struct srp_iu
*) (uintptr_t) wc
.wr_id
;
1922 list_add(&iu
->list
, &ch
->free_tx
);
1924 srp_handle_qp_err(wc
.wr_id
, wc
.status
, true, ch
);
1929 static int srp_queuecommand(struct Scsi_Host
*shost
, struct scsi_cmnd
*scmnd
)
1931 struct srp_target_port
*target
= host_to_target(shost
);
1932 struct srp_rport
*rport
= target
->rport
;
1933 struct srp_rdma_ch
*ch
;
1934 struct srp_request
*req
;
1936 struct srp_cmd
*cmd
;
1937 struct ib_device
*dev
;
1938 unsigned long flags
;
1942 const bool in_scsi_eh
= !in_interrupt() && current
== shost
->ehandler
;
1945 * The SCSI EH thread is the only context from which srp_queuecommand()
1946 * can get invoked for blocked devices (SDEV_BLOCK /
1947 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1948 * locking the rport mutex if invoked from inside the SCSI EH.
1951 mutex_lock(&rport
->mutex
);
1953 scmnd
->result
= srp_chkready(target
->rport
);
1954 if (unlikely(scmnd
->result
))
1957 WARN_ON_ONCE(scmnd
->request
->tag
< 0);
1958 tag
= blk_mq_unique_tag(scmnd
->request
);
1959 ch
= &target
->ch
[blk_mq_unique_tag_to_hwq(tag
)];
1960 idx
= blk_mq_unique_tag_to_tag(tag
);
1961 WARN_ONCE(idx
>= target
->req_ring_size
, "%s: tag %#x: idx %d >= %d\n",
1962 dev_name(&shost
->shost_gendev
), tag
, idx
,
1963 target
->req_ring_size
);
1965 spin_lock_irqsave(&ch
->lock
, flags
);
1966 iu
= __srp_get_tx_iu(ch
, SRP_IU_CMD
);
1967 spin_unlock_irqrestore(&ch
->lock
, flags
);
1972 req
= &ch
->req_ring
[idx
];
1973 dev
= target
->srp_host
->srp_dev
->dev
;
1974 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, target
->max_iu_len
,
1977 scmnd
->host_scribble
= (void *) req
;
1980 memset(cmd
, 0, sizeof *cmd
);
1982 cmd
->opcode
= SRP_CMD
;
1983 int_to_scsilun(scmnd
->device
->lun
, &cmd
->lun
);
1985 memcpy(cmd
->cdb
, scmnd
->cmnd
, scmnd
->cmd_len
);
1990 len
= srp_map_data(scmnd
, ch
, req
);
1992 shost_printk(KERN_ERR
, target
->scsi_host
,
1993 PFX
"Failed to map data (%d)\n", len
);
1995 * If we ran out of memory descriptors (-ENOMEM) because an
1996 * application is queuing many requests with more than
1997 * max_pages_per_mr sg-list elements, tell the SCSI mid-layer
1998 * to reduce queue depth temporarily.
2000 scmnd
->result
= len
== -ENOMEM
?
2001 DID_OK
<< 16 | QUEUE_FULL
<< 1 : DID_ERROR
<< 16;
2005 ib_dma_sync_single_for_device(dev
, iu
->dma
, target
->max_iu_len
,
2008 if (srp_post_send(ch
, iu
, len
)) {
2009 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
"Send failed\n");
2017 mutex_unlock(&rport
->mutex
);
2022 srp_unmap_data(scmnd
, ch
, req
);
2025 srp_put_tx_iu(ch
, iu
, SRP_IU_CMD
);
2028 * Avoid that the loops that iterate over the request ring can
2029 * encounter a dangling SCSI command pointer.
2034 if (scmnd
->result
) {
2035 scmnd
->scsi_done(scmnd
);
2038 ret
= SCSI_MLQUEUE_HOST_BUSY
;
2045 * Note: the resources allocated in this function are freed in
2048 static int srp_alloc_iu_bufs(struct srp_rdma_ch
*ch
)
2050 struct srp_target_port
*target
= ch
->target
;
2053 ch
->rx_ring
= kcalloc(target
->queue_size
, sizeof(*ch
->rx_ring
),
2057 ch
->tx_ring
= kcalloc(target
->queue_size
, sizeof(*ch
->tx_ring
),
2062 for (i
= 0; i
< target
->queue_size
; ++i
) {
2063 ch
->rx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
2065 GFP_KERNEL
, DMA_FROM_DEVICE
);
2066 if (!ch
->rx_ring
[i
])
2070 for (i
= 0; i
< target
->queue_size
; ++i
) {
2071 ch
->tx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
2073 GFP_KERNEL
, DMA_TO_DEVICE
);
2074 if (!ch
->tx_ring
[i
])
2077 list_add(&ch
->tx_ring
[i
]->list
, &ch
->free_tx
);
2083 for (i
= 0; i
< target
->queue_size
; ++i
) {
2084 srp_free_iu(target
->srp_host
, ch
->rx_ring
[i
]);
2085 srp_free_iu(target
->srp_host
, ch
->tx_ring
[i
]);
2098 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr
*qp_attr
, int attr_mask
)
2100 uint64_t T_tr_ns
, max_compl_time_ms
;
2101 uint32_t rq_tmo_jiffies
;
2104 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
2105 * table 91), both the QP timeout and the retry count have to be set
2106 * for RC QP's during the RTR to RTS transition.
2108 WARN_ON_ONCE((attr_mask
& (IB_QP_TIMEOUT
| IB_QP_RETRY_CNT
)) !=
2109 (IB_QP_TIMEOUT
| IB_QP_RETRY_CNT
));
2112 * Set target->rq_tmo_jiffies to one second more than the largest time
2113 * it can take before an error completion is generated. See also
2114 * C9-140..142 in the IBTA spec for more information about how to
2115 * convert the QP Local ACK Timeout value to nanoseconds.
2117 T_tr_ns
= 4096 * (1ULL << qp_attr
->timeout
);
2118 max_compl_time_ms
= qp_attr
->retry_cnt
* 4 * T_tr_ns
;
2119 do_div(max_compl_time_ms
, NSEC_PER_MSEC
);
2120 rq_tmo_jiffies
= msecs_to_jiffies(max_compl_time_ms
+ 1000);
2122 return rq_tmo_jiffies
;
2125 static void srp_cm_rep_handler(struct ib_cm_id
*cm_id
,
2126 const struct srp_login_rsp
*lrsp
,
2127 struct srp_rdma_ch
*ch
)
2129 struct srp_target_port
*target
= ch
->target
;
2130 struct ib_qp_attr
*qp_attr
= NULL
;
2135 if (lrsp
->opcode
== SRP_LOGIN_RSP
) {
2136 ch
->max_ti_iu_len
= be32_to_cpu(lrsp
->max_ti_iu_len
);
2137 ch
->req_lim
= be32_to_cpu(lrsp
->req_lim_delta
);
2140 * Reserve credits for task management so we don't
2141 * bounce requests back to the SCSI mid-layer.
2143 target
->scsi_host
->can_queue
2144 = min(ch
->req_lim
- SRP_TSK_MGMT_SQ_SIZE
,
2145 target
->scsi_host
->can_queue
);
2146 target
->scsi_host
->cmd_per_lun
2147 = min_t(int, target
->scsi_host
->can_queue
,
2148 target
->scsi_host
->cmd_per_lun
);
2150 shost_printk(KERN_WARNING
, target
->scsi_host
,
2151 PFX
"Unhandled RSP opcode %#x\n", lrsp
->opcode
);
2157 ret
= srp_alloc_iu_bufs(ch
);
2163 qp_attr
= kmalloc(sizeof *qp_attr
, GFP_KERNEL
);
2167 qp_attr
->qp_state
= IB_QPS_RTR
;
2168 ret
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
2172 ret
= ib_modify_qp(ch
->qp
, qp_attr
, attr_mask
);
2176 for (i
= 0; i
< target
->queue_size
; i
++) {
2177 struct srp_iu
*iu
= ch
->rx_ring
[i
];
2179 ret
= srp_post_recv(ch
, iu
);
2184 qp_attr
->qp_state
= IB_QPS_RTS
;
2185 ret
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
2189 target
->rq_tmo_jiffies
= srp_compute_rq_tmo(qp_attr
, attr_mask
);
2191 ret
= ib_modify_qp(ch
->qp
, qp_attr
, attr_mask
);
2195 ret
= ib_send_cm_rtu(cm_id
, NULL
, 0);
2204 static void srp_cm_rej_handler(struct ib_cm_id
*cm_id
,
2205 struct ib_cm_event
*event
,
2206 struct srp_rdma_ch
*ch
)
2208 struct srp_target_port
*target
= ch
->target
;
2209 struct Scsi_Host
*shost
= target
->scsi_host
;
2210 struct ib_class_port_info
*cpi
;
2213 switch (event
->param
.rej_rcvd
.reason
) {
2214 case IB_CM_REJ_PORT_CM_REDIRECT
:
2215 cpi
= event
->param
.rej_rcvd
.ari
;
2216 ch
->path
.dlid
= cpi
->redirect_lid
;
2217 ch
->path
.pkey
= cpi
->redirect_pkey
;
2218 cm_id
->remote_cm_qpn
= be32_to_cpu(cpi
->redirect_qp
) & 0x00ffffff;
2219 memcpy(ch
->path
.dgid
.raw
, cpi
->redirect_gid
, 16);
2221 ch
->status
= ch
->path
.dlid
?
2222 SRP_DLID_REDIRECT
: SRP_PORT_REDIRECT
;
2225 case IB_CM_REJ_PORT_REDIRECT
:
2226 if (srp_target_is_topspin(target
)) {
2228 * Topspin/Cisco SRP gateways incorrectly send
2229 * reject reason code 25 when they mean 24
2232 memcpy(ch
->path
.dgid
.raw
,
2233 event
->param
.rej_rcvd
.ari
, 16);
2235 shost_printk(KERN_DEBUG
, shost
,
2236 PFX
"Topspin/Cisco redirect to target port GID %016llx%016llx\n",
2237 be64_to_cpu(ch
->path
.dgid
.global
.subnet_prefix
),
2238 be64_to_cpu(ch
->path
.dgid
.global
.interface_id
));
2240 ch
->status
= SRP_PORT_REDIRECT
;
2242 shost_printk(KERN_WARNING
, shost
,
2243 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
2244 ch
->status
= -ECONNRESET
;
2248 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID
:
2249 shost_printk(KERN_WARNING
, shost
,
2250 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
2251 ch
->status
= -ECONNRESET
;
2254 case IB_CM_REJ_CONSUMER_DEFINED
:
2255 opcode
= *(u8
*) event
->private_data
;
2256 if (opcode
== SRP_LOGIN_REJ
) {
2257 struct srp_login_rej
*rej
= event
->private_data
;
2258 u32 reason
= be32_to_cpu(rej
->reason
);
2260 if (reason
== SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE
)
2261 shost_printk(KERN_WARNING
, shost
,
2262 PFX
"SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
2264 shost_printk(KERN_WARNING
, shost
, PFX
2265 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
2267 target
->orig_dgid
.raw
, reason
);
2269 shost_printk(KERN_WARNING
, shost
,
2270 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
2271 " opcode 0x%02x\n", opcode
);
2272 ch
->status
= -ECONNRESET
;
2275 case IB_CM_REJ_STALE_CONN
:
2276 shost_printk(KERN_WARNING
, shost
, " REJ reason: stale connection\n");
2277 ch
->status
= SRP_STALE_CONN
;
2281 shost_printk(KERN_WARNING
, shost
, " REJ reason 0x%x\n",
2282 event
->param
.rej_rcvd
.reason
);
2283 ch
->status
= -ECONNRESET
;
2287 static int srp_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
2289 struct srp_rdma_ch
*ch
= cm_id
->context
;
2290 struct srp_target_port
*target
= ch
->target
;
2293 switch (event
->event
) {
2294 case IB_CM_REQ_ERROR
:
2295 shost_printk(KERN_DEBUG
, target
->scsi_host
,
2296 PFX
"Sending CM REQ failed\n");
2298 ch
->status
= -ECONNRESET
;
2301 case IB_CM_REP_RECEIVED
:
2303 srp_cm_rep_handler(cm_id
, event
->private_data
, ch
);
2306 case IB_CM_REJ_RECEIVED
:
2307 shost_printk(KERN_DEBUG
, target
->scsi_host
, PFX
"REJ received\n");
2310 srp_cm_rej_handler(cm_id
, event
, ch
);
2313 case IB_CM_DREQ_RECEIVED
:
2314 shost_printk(KERN_WARNING
, target
->scsi_host
,
2315 PFX
"DREQ received - connection closed\n");
2316 ch
->connected
= false;
2317 if (ib_send_cm_drep(cm_id
, NULL
, 0))
2318 shost_printk(KERN_ERR
, target
->scsi_host
,
2319 PFX
"Sending CM DREP failed\n");
2320 queue_work(system_long_wq
, &target
->tl_err_work
);
2323 case IB_CM_TIMEWAIT_EXIT
:
2324 shost_printk(KERN_ERR
, target
->scsi_host
,
2325 PFX
"connection closed\n");
2331 case IB_CM_MRA_RECEIVED
:
2332 case IB_CM_DREQ_ERROR
:
2333 case IB_CM_DREP_RECEIVED
:
2337 shost_printk(KERN_WARNING
, target
->scsi_host
,
2338 PFX
"Unhandled CM event %d\n", event
->event
);
2343 complete(&ch
->done
);
2349 * srp_change_queue_depth - setting device queue depth
2350 * @sdev: scsi device struct
2351 * @qdepth: requested queue depth
2353 * Returns queue depth.
2356 srp_change_queue_depth(struct scsi_device
*sdev
, int qdepth
)
2358 if (!sdev
->tagged_supported
)
2360 return scsi_change_queue_depth(sdev
, qdepth
);
2363 static int srp_send_tsk_mgmt(struct srp_rdma_ch
*ch
, u64 req_tag
, u64 lun
,
2366 struct srp_target_port
*target
= ch
->target
;
2367 struct srp_rport
*rport
= target
->rport
;
2368 struct ib_device
*dev
= target
->srp_host
->srp_dev
->dev
;
2370 struct srp_tsk_mgmt
*tsk_mgmt
;
2372 if (!ch
->connected
|| target
->qp_in_error
)
2375 init_completion(&ch
->tsk_mgmt_done
);
2378 * Lock the rport mutex to avoid that srp_create_ch_ib() is
2379 * invoked while a task management function is being sent.
2381 mutex_lock(&rport
->mutex
);
2382 spin_lock_irq(&ch
->lock
);
2383 iu
= __srp_get_tx_iu(ch
, SRP_IU_TSK_MGMT
);
2384 spin_unlock_irq(&ch
->lock
);
2387 mutex_unlock(&rport
->mutex
);
2392 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, sizeof *tsk_mgmt
,
2395 memset(tsk_mgmt
, 0, sizeof *tsk_mgmt
);
2397 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
2398 int_to_scsilun(lun
, &tsk_mgmt
->lun
);
2399 tsk_mgmt
->tag
= req_tag
| SRP_TAG_TSK_MGMT
;
2400 tsk_mgmt
->tsk_mgmt_func
= func
;
2401 tsk_mgmt
->task_tag
= req_tag
;
2403 ib_dma_sync_single_for_device(dev
, iu
->dma
, sizeof *tsk_mgmt
,
2405 if (srp_post_send(ch
, iu
, sizeof(*tsk_mgmt
))) {
2406 srp_put_tx_iu(ch
, iu
, SRP_IU_TSK_MGMT
);
2407 mutex_unlock(&rport
->mutex
);
2411 mutex_unlock(&rport
->mutex
);
2413 if (!wait_for_completion_timeout(&ch
->tsk_mgmt_done
,
2414 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS
)))
2420 static int srp_abort(struct scsi_cmnd
*scmnd
)
2422 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
2423 struct srp_request
*req
= (struct srp_request
*) scmnd
->host_scribble
;
2426 struct srp_rdma_ch
*ch
;
2429 shost_printk(KERN_ERR
, target
->scsi_host
, "SRP abort called\n");
2433 tag
= blk_mq_unique_tag(scmnd
->request
);
2434 ch_idx
= blk_mq_unique_tag_to_hwq(tag
);
2435 if (WARN_ON_ONCE(ch_idx
>= target
->ch_count
))
2437 ch
= &target
->ch
[ch_idx
];
2438 if (!srp_claim_req(ch
, req
, NULL
, scmnd
))
2440 shost_printk(KERN_ERR
, target
->scsi_host
,
2441 "Sending SRP abort for tag %#x\n", tag
);
2442 if (srp_send_tsk_mgmt(ch
, tag
, scmnd
->device
->lun
,
2443 SRP_TSK_ABORT_TASK
) == 0)
2445 else if (target
->rport
->state
== SRP_RPORT_LOST
)
2449 srp_free_req(ch
, req
, scmnd
, 0);
2450 scmnd
->result
= DID_ABORT
<< 16;
2451 scmnd
->scsi_done(scmnd
);
2456 static int srp_reset_device(struct scsi_cmnd
*scmnd
)
2458 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
2459 struct srp_rdma_ch
*ch
;
2462 shost_printk(KERN_ERR
, target
->scsi_host
, "SRP reset_device called\n");
2464 ch
= &target
->ch
[0];
2465 if (srp_send_tsk_mgmt(ch
, SRP_TAG_NO_REQ
, scmnd
->device
->lun
,
2468 if (ch
->tsk_mgmt_status
)
2471 for (i
= 0; i
< target
->ch_count
; i
++) {
2472 ch
= &target
->ch
[i
];
2473 for (i
= 0; i
< target
->req_ring_size
; ++i
) {
2474 struct srp_request
*req
= &ch
->req_ring
[i
];
2476 srp_finish_req(ch
, req
, scmnd
->device
, DID_RESET
<< 16);
2483 static int srp_reset_host(struct scsi_cmnd
*scmnd
)
2485 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
2487 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
"SRP reset_host called\n");
2489 return srp_reconnect_rport(target
->rport
) == 0 ? SUCCESS
: FAILED
;
2492 static int srp_slave_configure(struct scsi_device
*sdev
)
2494 struct Scsi_Host
*shost
= sdev
->host
;
2495 struct srp_target_port
*target
= host_to_target(shost
);
2496 struct request_queue
*q
= sdev
->request_queue
;
2497 unsigned long timeout
;
2499 if (sdev
->type
== TYPE_DISK
) {
2500 timeout
= max_t(unsigned, 30 * HZ
, target
->rq_tmo_jiffies
);
2501 blk_queue_rq_timeout(q
, timeout
);
2507 static ssize_t
show_id_ext(struct device
*dev
, struct device_attribute
*attr
,
2510 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2512 return sprintf(buf
, "0x%016llx\n", be64_to_cpu(target
->id_ext
));
2515 static ssize_t
show_ioc_guid(struct device
*dev
, struct device_attribute
*attr
,
2518 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2520 return sprintf(buf
, "0x%016llx\n", be64_to_cpu(target
->ioc_guid
));
2523 static ssize_t
show_service_id(struct device
*dev
,
2524 struct device_attribute
*attr
, char *buf
)
2526 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2528 return sprintf(buf
, "0x%016llx\n", be64_to_cpu(target
->service_id
));
2531 static ssize_t
show_pkey(struct device
*dev
, struct device_attribute
*attr
,
2534 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2536 return sprintf(buf
, "0x%04x\n", be16_to_cpu(target
->pkey
));
2539 static ssize_t
show_sgid(struct device
*dev
, struct device_attribute
*attr
,
2542 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2544 return sprintf(buf
, "%pI6\n", target
->sgid
.raw
);
2547 static ssize_t
show_dgid(struct device
*dev
, struct device_attribute
*attr
,
2550 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2551 struct srp_rdma_ch
*ch
= &target
->ch
[0];
2553 return sprintf(buf
, "%pI6\n", ch
->path
.dgid
.raw
);
2556 static ssize_t
show_orig_dgid(struct device
*dev
,
2557 struct device_attribute
*attr
, char *buf
)
2559 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2561 return sprintf(buf
, "%pI6\n", target
->orig_dgid
.raw
);
2564 static ssize_t
show_req_lim(struct device
*dev
,
2565 struct device_attribute
*attr
, char *buf
)
2567 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2568 struct srp_rdma_ch
*ch
;
2569 int i
, req_lim
= INT_MAX
;
2571 for (i
= 0; i
< target
->ch_count
; i
++) {
2572 ch
= &target
->ch
[i
];
2573 req_lim
= min(req_lim
, ch
->req_lim
);
2575 return sprintf(buf
, "%d\n", req_lim
);
2578 static ssize_t
show_zero_req_lim(struct device
*dev
,
2579 struct device_attribute
*attr
, char *buf
)
2581 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2583 return sprintf(buf
, "%d\n", target
->zero_req_lim
);
2586 static ssize_t
show_local_ib_port(struct device
*dev
,
2587 struct device_attribute
*attr
, char *buf
)
2589 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2591 return sprintf(buf
, "%d\n", target
->srp_host
->port
);
2594 static ssize_t
show_local_ib_device(struct device
*dev
,
2595 struct device_attribute
*attr
, char *buf
)
2597 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2599 return sprintf(buf
, "%s\n", target
->srp_host
->srp_dev
->dev
->name
);
2602 static ssize_t
show_ch_count(struct device
*dev
, struct device_attribute
*attr
,
2605 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2607 return sprintf(buf
, "%d\n", target
->ch_count
);
2610 static ssize_t
show_comp_vector(struct device
*dev
,
2611 struct device_attribute
*attr
, char *buf
)
2613 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2615 return sprintf(buf
, "%d\n", target
->comp_vector
);
2618 static ssize_t
show_tl_retry_count(struct device
*dev
,
2619 struct device_attribute
*attr
, char *buf
)
2621 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2623 return sprintf(buf
, "%d\n", target
->tl_retry_count
);
2626 static ssize_t
show_cmd_sg_entries(struct device
*dev
,
2627 struct device_attribute
*attr
, char *buf
)
2629 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2631 return sprintf(buf
, "%u\n", target
->cmd_sg_cnt
);
2634 static ssize_t
show_allow_ext_sg(struct device
*dev
,
2635 struct device_attribute
*attr
, char *buf
)
2637 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2639 return sprintf(buf
, "%s\n", target
->allow_ext_sg
? "true" : "false");
2642 static DEVICE_ATTR(id_ext
, S_IRUGO
, show_id_ext
, NULL
);
2643 static DEVICE_ATTR(ioc_guid
, S_IRUGO
, show_ioc_guid
, NULL
);
2644 static DEVICE_ATTR(service_id
, S_IRUGO
, show_service_id
, NULL
);
2645 static DEVICE_ATTR(pkey
, S_IRUGO
, show_pkey
, NULL
);
2646 static DEVICE_ATTR(sgid
, S_IRUGO
, show_sgid
, NULL
);
2647 static DEVICE_ATTR(dgid
, S_IRUGO
, show_dgid
, NULL
);
2648 static DEVICE_ATTR(orig_dgid
, S_IRUGO
, show_orig_dgid
, NULL
);
2649 static DEVICE_ATTR(req_lim
, S_IRUGO
, show_req_lim
, NULL
);
2650 static DEVICE_ATTR(zero_req_lim
, S_IRUGO
, show_zero_req_lim
, NULL
);
2651 static DEVICE_ATTR(local_ib_port
, S_IRUGO
, show_local_ib_port
, NULL
);
2652 static DEVICE_ATTR(local_ib_device
, S_IRUGO
, show_local_ib_device
, NULL
);
2653 static DEVICE_ATTR(ch_count
, S_IRUGO
, show_ch_count
, NULL
);
2654 static DEVICE_ATTR(comp_vector
, S_IRUGO
, show_comp_vector
, NULL
);
2655 static DEVICE_ATTR(tl_retry_count
, S_IRUGO
, show_tl_retry_count
, NULL
);
2656 static DEVICE_ATTR(cmd_sg_entries
, S_IRUGO
, show_cmd_sg_entries
, NULL
);
2657 static DEVICE_ATTR(allow_ext_sg
, S_IRUGO
, show_allow_ext_sg
, NULL
);
2659 static struct device_attribute
*srp_host_attrs
[] = {
2662 &dev_attr_service_id
,
2666 &dev_attr_orig_dgid
,
2668 &dev_attr_zero_req_lim
,
2669 &dev_attr_local_ib_port
,
2670 &dev_attr_local_ib_device
,
2672 &dev_attr_comp_vector
,
2673 &dev_attr_tl_retry_count
,
2674 &dev_attr_cmd_sg_entries
,
2675 &dev_attr_allow_ext_sg
,
2679 static struct scsi_host_template srp_template
= {
2680 .module
= THIS_MODULE
,
2681 .name
= "InfiniBand SRP initiator",
2682 .proc_name
= DRV_NAME
,
2683 .slave_configure
= srp_slave_configure
,
2684 .info
= srp_target_info
,
2685 .queuecommand
= srp_queuecommand
,
2686 .change_queue_depth
= srp_change_queue_depth
,
2687 .eh_abort_handler
= srp_abort
,
2688 .eh_device_reset_handler
= srp_reset_device
,
2689 .eh_host_reset_handler
= srp_reset_host
,
2690 .skip_settle_delay
= true,
2691 .sg_tablesize
= SRP_DEF_SG_TABLESIZE
,
2692 .can_queue
= SRP_DEFAULT_CMD_SQ_SIZE
,
2694 .cmd_per_lun
= SRP_DEFAULT_CMD_SQ_SIZE
,
2695 .use_clustering
= ENABLE_CLUSTERING
,
2696 .shost_attrs
= srp_host_attrs
,
2698 .track_queue_depth
= 1,
2701 static int srp_sdev_count(struct Scsi_Host
*host
)
2703 struct scsi_device
*sdev
;
2706 shost_for_each_device(sdev
, host
)
2714 * < 0 upon failure. Caller is responsible for SRP target port cleanup.
2715 * 0 and target->state == SRP_TARGET_REMOVED if asynchronous target port
2716 * removal has been scheduled.
2717 * 0 and target->state != SRP_TARGET_REMOVED upon success.
2719 static int srp_add_target(struct srp_host
*host
, struct srp_target_port
*target
)
2721 struct srp_rport_identifiers ids
;
2722 struct srp_rport
*rport
;
2724 target
->state
= SRP_TARGET_SCANNING
;
2725 sprintf(target
->target_name
, "SRP.T10:%016llX",
2726 be64_to_cpu(target
->id_ext
));
2728 if (scsi_add_host(target
->scsi_host
, host
->srp_dev
->dev
->dma_device
))
2731 memcpy(ids
.port_id
, &target
->id_ext
, 8);
2732 memcpy(ids
.port_id
+ 8, &target
->ioc_guid
, 8);
2733 ids
.roles
= SRP_RPORT_ROLE_TARGET
;
2734 rport
= srp_rport_add(target
->scsi_host
, &ids
);
2735 if (IS_ERR(rport
)) {
2736 scsi_remove_host(target
->scsi_host
);
2737 return PTR_ERR(rport
);
2740 rport
->lld_data
= target
;
2741 target
->rport
= rport
;
2743 spin_lock(&host
->target_lock
);
2744 list_add_tail(&target
->list
, &host
->target_list
);
2745 spin_unlock(&host
->target_lock
);
2747 scsi_scan_target(&target
->scsi_host
->shost_gendev
,
2748 0, target
->scsi_id
, SCAN_WILD_CARD
, 0);
2750 if (srp_connected_ch(target
) < target
->ch_count
||
2751 target
->qp_in_error
) {
2752 shost_printk(KERN_INFO
, target
->scsi_host
,
2753 PFX
"SCSI scan failed - removing SCSI host\n");
2754 srp_queue_remove_work(target
);
2758 pr_debug(PFX
"%s: SCSI scan succeeded - detected %d LUNs\n",
2759 dev_name(&target
->scsi_host
->shost_gendev
),
2760 srp_sdev_count(target
->scsi_host
));
2762 spin_lock_irq(&target
->lock
);
2763 if (target
->state
== SRP_TARGET_SCANNING
)
2764 target
->state
= SRP_TARGET_LIVE
;
2765 spin_unlock_irq(&target
->lock
);
2771 static void srp_release_dev(struct device
*dev
)
2773 struct srp_host
*host
=
2774 container_of(dev
, struct srp_host
, dev
);
2776 complete(&host
->released
);
2779 static struct class srp_class
= {
2780 .name
= "infiniband_srp",
2781 .dev_release
= srp_release_dev
2785 * srp_conn_unique() - check whether the connection to a target is unique
2787 * @target: SRP target port.
2789 static bool srp_conn_unique(struct srp_host
*host
,
2790 struct srp_target_port
*target
)
2792 struct srp_target_port
*t
;
2795 if (target
->state
== SRP_TARGET_REMOVED
)
2800 spin_lock(&host
->target_lock
);
2801 list_for_each_entry(t
, &host
->target_list
, list
) {
2803 target
->id_ext
== t
->id_ext
&&
2804 target
->ioc_guid
== t
->ioc_guid
&&
2805 target
->initiator_ext
== t
->initiator_ext
) {
2810 spin_unlock(&host
->target_lock
);
2817 * Target ports are added by writing
2819 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2820 * pkey=<P_Key>,service_id=<service ID>
2822 * to the add_target sysfs attribute.
2826 SRP_OPT_ID_EXT
= 1 << 0,
2827 SRP_OPT_IOC_GUID
= 1 << 1,
2828 SRP_OPT_DGID
= 1 << 2,
2829 SRP_OPT_PKEY
= 1 << 3,
2830 SRP_OPT_SERVICE_ID
= 1 << 4,
2831 SRP_OPT_MAX_SECT
= 1 << 5,
2832 SRP_OPT_MAX_CMD_PER_LUN
= 1 << 6,
2833 SRP_OPT_IO_CLASS
= 1 << 7,
2834 SRP_OPT_INITIATOR_EXT
= 1 << 8,
2835 SRP_OPT_CMD_SG_ENTRIES
= 1 << 9,
2836 SRP_OPT_ALLOW_EXT_SG
= 1 << 10,
2837 SRP_OPT_SG_TABLESIZE
= 1 << 11,
2838 SRP_OPT_COMP_VECTOR
= 1 << 12,
2839 SRP_OPT_TL_RETRY_COUNT
= 1 << 13,
2840 SRP_OPT_QUEUE_SIZE
= 1 << 14,
2841 SRP_OPT_ALL
= (SRP_OPT_ID_EXT
|
2845 SRP_OPT_SERVICE_ID
),
2848 static const match_table_t srp_opt_tokens
= {
2849 { SRP_OPT_ID_EXT
, "id_ext=%s" },
2850 { SRP_OPT_IOC_GUID
, "ioc_guid=%s" },
2851 { SRP_OPT_DGID
, "dgid=%s" },
2852 { SRP_OPT_PKEY
, "pkey=%x" },
2853 { SRP_OPT_SERVICE_ID
, "service_id=%s" },
2854 { SRP_OPT_MAX_SECT
, "max_sect=%d" },
2855 { SRP_OPT_MAX_CMD_PER_LUN
, "max_cmd_per_lun=%d" },
2856 { SRP_OPT_IO_CLASS
, "io_class=%x" },
2857 { SRP_OPT_INITIATOR_EXT
, "initiator_ext=%s" },
2858 { SRP_OPT_CMD_SG_ENTRIES
, "cmd_sg_entries=%u" },
2859 { SRP_OPT_ALLOW_EXT_SG
, "allow_ext_sg=%u" },
2860 { SRP_OPT_SG_TABLESIZE
, "sg_tablesize=%u" },
2861 { SRP_OPT_COMP_VECTOR
, "comp_vector=%u" },
2862 { SRP_OPT_TL_RETRY_COUNT
, "tl_retry_count=%u" },
2863 { SRP_OPT_QUEUE_SIZE
, "queue_size=%d" },
2864 { SRP_OPT_ERR
, NULL
}
2867 static int srp_parse_options(const char *buf
, struct srp_target_port
*target
)
2869 char *options
, *sep_opt
;
2872 substring_t args
[MAX_OPT_ARGS
];
2878 options
= kstrdup(buf
, GFP_KERNEL
);
2883 while ((p
= strsep(&sep_opt
, ",\n")) != NULL
) {
2887 token
= match_token(p
, srp_opt_tokens
, args
);
2891 case SRP_OPT_ID_EXT
:
2892 p
= match_strdup(args
);
2897 target
->id_ext
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
2901 case SRP_OPT_IOC_GUID
:
2902 p
= match_strdup(args
);
2907 target
->ioc_guid
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
2912 p
= match_strdup(args
);
2917 if (strlen(p
) != 32) {
2918 pr_warn("bad dest GID parameter '%s'\n", p
);
2923 for (i
= 0; i
< 16; ++i
) {
2924 strlcpy(dgid
, p
+ i
* 2, sizeof(dgid
));
2925 if (sscanf(dgid
, "%hhx",
2926 &target
->orig_dgid
.raw
[i
]) < 1) {
2936 if (match_hex(args
, &token
)) {
2937 pr_warn("bad P_Key parameter '%s'\n", p
);
2940 target
->pkey
= cpu_to_be16(token
);
2943 case SRP_OPT_SERVICE_ID
:
2944 p
= match_strdup(args
);
2949 target
->service_id
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
2953 case SRP_OPT_MAX_SECT
:
2954 if (match_int(args
, &token
)) {
2955 pr_warn("bad max sect parameter '%s'\n", p
);
2958 target
->scsi_host
->max_sectors
= token
;
2961 case SRP_OPT_QUEUE_SIZE
:
2962 if (match_int(args
, &token
) || token
< 1) {
2963 pr_warn("bad queue_size parameter '%s'\n", p
);
2966 target
->scsi_host
->can_queue
= token
;
2967 target
->queue_size
= token
+ SRP_RSP_SQ_SIZE
+
2968 SRP_TSK_MGMT_SQ_SIZE
;
2969 if (!(opt_mask
& SRP_OPT_MAX_CMD_PER_LUN
))
2970 target
->scsi_host
->cmd_per_lun
= token
;
2973 case SRP_OPT_MAX_CMD_PER_LUN
:
2974 if (match_int(args
, &token
) || token
< 1) {
2975 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2979 target
->scsi_host
->cmd_per_lun
= token
;
2982 case SRP_OPT_IO_CLASS
:
2983 if (match_hex(args
, &token
)) {
2984 pr_warn("bad IO class parameter '%s'\n", p
);
2987 if (token
!= SRP_REV10_IB_IO_CLASS
&&
2988 token
!= SRP_REV16A_IB_IO_CLASS
) {
2989 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2990 token
, SRP_REV10_IB_IO_CLASS
,
2991 SRP_REV16A_IB_IO_CLASS
);
2994 target
->io_class
= token
;
2997 case SRP_OPT_INITIATOR_EXT
:
2998 p
= match_strdup(args
);
3003 target
->initiator_ext
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
3007 case SRP_OPT_CMD_SG_ENTRIES
:
3008 if (match_int(args
, &token
) || token
< 1 || token
> 255) {
3009 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
3013 target
->cmd_sg_cnt
= token
;
3016 case SRP_OPT_ALLOW_EXT_SG
:
3017 if (match_int(args
, &token
)) {
3018 pr_warn("bad allow_ext_sg parameter '%s'\n", p
);
3021 target
->allow_ext_sg
= !!token
;
3024 case SRP_OPT_SG_TABLESIZE
:
3025 if (match_int(args
, &token
) || token
< 1 ||
3026 token
> SCSI_MAX_SG_CHAIN_SEGMENTS
) {
3027 pr_warn("bad max sg_tablesize parameter '%s'\n",
3031 target
->sg_tablesize
= token
;
3034 case SRP_OPT_COMP_VECTOR
:
3035 if (match_int(args
, &token
) || token
< 0) {
3036 pr_warn("bad comp_vector parameter '%s'\n", p
);
3039 target
->comp_vector
= token
;
3042 case SRP_OPT_TL_RETRY_COUNT
:
3043 if (match_int(args
, &token
) || token
< 2 || token
> 7) {
3044 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
3048 target
->tl_retry_count
= token
;
3052 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
3058 if ((opt_mask
& SRP_OPT_ALL
) == SRP_OPT_ALL
)
3061 for (i
= 0; i
< ARRAY_SIZE(srp_opt_tokens
); ++i
)
3062 if ((srp_opt_tokens
[i
].token
& SRP_OPT_ALL
) &&
3063 !(srp_opt_tokens
[i
].token
& opt_mask
))
3064 pr_warn("target creation request is missing parameter '%s'\n",
3065 srp_opt_tokens
[i
].pattern
);
3067 if (target
->scsi_host
->cmd_per_lun
> target
->scsi_host
->can_queue
3068 && (opt_mask
& SRP_OPT_MAX_CMD_PER_LUN
))
3069 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
3070 target
->scsi_host
->cmd_per_lun
,
3071 target
->scsi_host
->can_queue
);
3078 static ssize_t
srp_create_target(struct device
*dev
,
3079 struct device_attribute
*attr
,
3080 const char *buf
, size_t count
)
3082 struct srp_host
*host
=
3083 container_of(dev
, struct srp_host
, dev
);
3084 struct Scsi_Host
*target_host
;
3085 struct srp_target_port
*target
;
3086 struct srp_rdma_ch
*ch
;
3087 struct srp_device
*srp_dev
= host
->srp_dev
;
3088 struct ib_device
*ibdev
= srp_dev
->dev
;
3089 int ret
, node_idx
, node
, cpu
, i
;
3090 bool multich
= false;
3092 target_host
= scsi_host_alloc(&srp_template
,
3093 sizeof (struct srp_target_port
));
3097 target_host
->transportt
= ib_srp_transport_template
;
3098 target_host
->max_channel
= 0;
3099 target_host
->max_id
= 1;
3100 target_host
->max_lun
= -1LL;
3101 target_host
->max_cmd_len
= sizeof ((struct srp_cmd
*) (void *) 0L)->cdb
;
3103 target
= host_to_target(target_host
);
3105 target
->io_class
= SRP_REV16A_IB_IO_CLASS
;
3106 target
->scsi_host
= target_host
;
3107 target
->srp_host
= host
;
3108 target
->lkey
= host
->srp_dev
->pd
->local_dma_lkey
;
3109 target
->rkey
= host
->srp_dev
->mr
->rkey
;
3110 target
->cmd_sg_cnt
= cmd_sg_entries
;
3111 target
->sg_tablesize
= indirect_sg_entries
? : cmd_sg_entries
;
3112 target
->allow_ext_sg
= allow_ext_sg
;
3113 target
->tl_retry_count
= 7;
3114 target
->queue_size
= SRP_DEFAULT_QUEUE_SIZE
;
3117 * Avoid that the SCSI host can be removed by srp_remove_target()
3118 * before this function returns.
3120 scsi_host_get(target
->scsi_host
);
3122 mutex_lock(&host
->add_target_mutex
);
3124 ret
= srp_parse_options(buf
, target
);
3128 ret
= scsi_init_shared_tag_map(target_host
, target_host
->can_queue
);
3132 target
->req_ring_size
= target
->queue_size
- SRP_TSK_MGMT_SQ_SIZE
;
3134 if (!srp_conn_unique(target
->srp_host
, target
)) {
3135 shost_printk(KERN_INFO
, target
->scsi_host
,
3136 PFX
"Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
3137 be64_to_cpu(target
->id_ext
),
3138 be64_to_cpu(target
->ioc_guid
),
3139 be64_to_cpu(target
->initiator_ext
));
3144 if (!srp_dev
->has_fmr
&& !srp_dev
->has_fr
&& !target
->allow_ext_sg
&&
3145 target
->cmd_sg_cnt
< target
->sg_tablesize
) {
3146 pr_warn("No MR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
3147 target
->sg_tablesize
= target
->cmd_sg_cnt
;
3150 target_host
->sg_tablesize
= target
->sg_tablesize
;
3151 target
->indirect_size
= target
->sg_tablesize
*
3152 sizeof (struct srp_direct_buf
);
3153 target
->max_iu_len
= sizeof (struct srp_cmd
) +
3154 sizeof (struct srp_indirect_buf
) +
3155 target
->cmd_sg_cnt
* sizeof (struct srp_direct_buf
);
3157 INIT_WORK(&target
->tl_err_work
, srp_tl_err_work
);
3158 INIT_WORK(&target
->remove_work
, srp_remove_work
);
3159 spin_lock_init(&target
->lock
);
3160 ret
= ib_query_gid(ibdev
, host
->port
, 0, &target
->sgid
);
3165 target
->ch_count
= max_t(unsigned, num_online_nodes(),
3167 min(4 * num_online_nodes(),
3168 ibdev
->num_comp_vectors
),
3169 num_online_cpus()));
3170 target
->ch
= kcalloc(target
->ch_count
, sizeof(*target
->ch
),
3176 for_each_online_node(node
) {
3177 const int ch_start
= (node_idx
* target
->ch_count
/
3178 num_online_nodes());
3179 const int ch_end
= ((node_idx
+ 1) * target
->ch_count
/
3180 num_online_nodes());
3181 const int cv_start
= (node_idx
* ibdev
->num_comp_vectors
/
3182 num_online_nodes() + target
->comp_vector
)
3183 % ibdev
->num_comp_vectors
;
3184 const int cv_end
= ((node_idx
+ 1) * ibdev
->num_comp_vectors
/
3185 num_online_nodes() + target
->comp_vector
)
3186 % ibdev
->num_comp_vectors
;
3189 for_each_online_cpu(cpu
) {
3190 if (cpu_to_node(cpu
) != node
)
3192 if (ch_start
+ cpu_idx
>= ch_end
)
3194 ch
= &target
->ch
[ch_start
+ cpu_idx
];
3195 ch
->target
= target
;
3196 ch
->comp_vector
= cv_start
== cv_end
? cv_start
:
3197 cv_start
+ cpu_idx
% (cv_end
- cv_start
);
3198 spin_lock_init(&ch
->lock
);
3199 INIT_LIST_HEAD(&ch
->free_tx
);
3200 ret
= srp_new_cm_id(ch
);
3202 goto err_disconnect
;
3204 ret
= srp_create_ch_ib(ch
);
3206 goto err_disconnect
;
3208 ret
= srp_alloc_req_data(ch
);
3210 goto err_disconnect
;
3212 ret
= srp_connect_ch(ch
, multich
);
3214 shost_printk(KERN_ERR
, target
->scsi_host
,
3215 PFX
"Connection %d/%d failed\n",
3218 if (node_idx
== 0 && cpu_idx
== 0) {
3219 goto err_disconnect
;
3221 srp_free_ch_ib(target
, ch
);
3222 srp_free_req_data(target
, ch
);
3223 target
->ch_count
= ch
- target
->ch
;
3235 target
->scsi_host
->nr_hw_queues
= target
->ch_count
;
3237 ret
= srp_add_target(host
, target
);
3239 goto err_disconnect
;
3241 if (target
->state
!= SRP_TARGET_REMOVED
) {
3242 shost_printk(KERN_DEBUG
, target
->scsi_host
, PFX
3243 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
3244 be64_to_cpu(target
->id_ext
),
3245 be64_to_cpu(target
->ioc_guid
),
3246 be16_to_cpu(target
->pkey
),
3247 be64_to_cpu(target
->service_id
),
3248 target
->sgid
.raw
, target
->orig_dgid
.raw
);
3254 mutex_unlock(&host
->add_target_mutex
);
3256 scsi_host_put(target
->scsi_host
);
3258 scsi_host_put(target
->scsi_host
);
3263 srp_disconnect_target(target
);
3265 for (i
= 0; i
< target
->ch_count
; i
++) {
3266 ch
= &target
->ch
[i
];
3267 srp_free_ch_ib(target
, ch
);
3268 srp_free_req_data(target
, ch
);
3275 static DEVICE_ATTR(add_target
, S_IWUSR
, NULL
, srp_create_target
);
3277 static ssize_t
show_ibdev(struct device
*dev
, struct device_attribute
*attr
,
3280 struct srp_host
*host
= container_of(dev
, struct srp_host
, dev
);
3282 return sprintf(buf
, "%s\n", host
->srp_dev
->dev
->name
);
3285 static DEVICE_ATTR(ibdev
, S_IRUGO
, show_ibdev
, NULL
);
3287 static ssize_t
show_port(struct device
*dev
, struct device_attribute
*attr
,
3290 struct srp_host
*host
= container_of(dev
, struct srp_host
, dev
);
3292 return sprintf(buf
, "%d\n", host
->port
);
3295 static DEVICE_ATTR(port
, S_IRUGO
, show_port
, NULL
);
3297 static struct srp_host
*srp_add_port(struct srp_device
*device
, u8 port
)
3299 struct srp_host
*host
;
3301 host
= kzalloc(sizeof *host
, GFP_KERNEL
);
3305 INIT_LIST_HEAD(&host
->target_list
);
3306 spin_lock_init(&host
->target_lock
);
3307 init_completion(&host
->released
);
3308 mutex_init(&host
->add_target_mutex
);
3309 host
->srp_dev
= device
;
3312 host
->dev
.class = &srp_class
;
3313 host
->dev
.parent
= device
->dev
->dma_device
;
3314 dev_set_name(&host
->dev
, "srp-%s-%d", device
->dev
->name
, port
);
3316 if (device_register(&host
->dev
))
3318 if (device_create_file(&host
->dev
, &dev_attr_add_target
))
3320 if (device_create_file(&host
->dev
, &dev_attr_ibdev
))
3322 if (device_create_file(&host
->dev
, &dev_attr_port
))
3328 device_unregister(&host
->dev
);
3336 static void srp_add_one(struct ib_device
*device
)
3338 struct srp_device
*srp_dev
;
3339 struct ib_device_attr
*dev_attr
;
3340 struct srp_host
*host
;
3341 int mr_page_shift
, p
;
3342 u64 max_pages_per_mr
;
3344 dev_attr
= kmalloc(sizeof *dev_attr
, GFP_KERNEL
);
3348 if (ib_query_device(device
, dev_attr
)) {
3349 pr_warn("Query device failed for %s\n", device
->name
);
3353 srp_dev
= kmalloc(sizeof *srp_dev
, GFP_KERNEL
);
3357 srp_dev
->has_fmr
= (device
->alloc_fmr
&& device
->dealloc_fmr
&&
3358 device
->map_phys_fmr
&& device
->unmap_fmr
);
3359 srp_dev
->has_fr
= (dev_attr
->device_cap_flags
&
3360 IB_DEVICE_MEM_MGT_EXTENSIONS
);
3361 if (!srp_dev
->has_fmr
&& !srp_dev
->has_fr
)
3362 dev_warn(&device
->dev
, "neither FMR nor FR is supported\n");
3364 srp_dev
->use_fast_reg
= (srp_dev
->has_fr
&&
3365 (!srp_dev
->has_fmr
|| prefer_fr
));
3366 srp_dev
->use_fmr
= !srp_dev
->use_fast_reg
&& srp_dev
->has_fmr
;
3369 * Use the smallest page size supported by the HCA, down to a
3370 * minimum of 4096 bytes. We're unlikely to build large sglists
3371 * out of smaller entries.
3373 mr_page_shift
= max(12, ffs(dev_attr
->page_size_cap
) - 1);
3374 srp_dev
->mr_page_size
= 1 << mr_page_shift
;
3375 srp_dev
->mr_page_mask
= ~((u64
) srp_dev
->mr_page_size
- 1);
3376 max_pages_per_mr
= dev_attr
->max_mr_size
;
3377 do_div(max_pages_per_mr
, srp_dev
->mr_page_size
);
3378 srp_dev
->max_pages_per_mr
= min_t(u64
, SRP_MAX_PAGES_PER_MR
,
3380 if (srp_dev
->use_fast_reg
) {
3381 srp_dev
->max_pages_per_mr
=
3382 min_t(u32
, srp_dev
->max_pages_per_mr
,
3383 dev_attr
->max_fast_reg_page_list_len
);
3385 srp_dev
->mr_max_size
= srp_dev
->mr_page_size
*
3386 srp_dev
->max_pages_per_mr
;
3387 pr_debug("%s: mr_page_shift = %d, dev_attr->max_mr_size = %#llx, dev_attr->max_fast_reg_page_list_len = %u, max_pages_per_mr = %d, mr_max_size = %#x\n",
3388 device
->name
, mr_page_shift
, dev_attr
->max_mr_size
,
3389 dev_attr
->max_fast_reg_page_list_len
,
3390 srp_dev
->max_pages_per_mr
, srp_dev
->mr_max_size
);
3392 INIT_LIST_HEAD(&srp_dev
->dev_list
);
3394 srp_dev
->dev
= device
;
3395 srp_dev
->pd
= ib_alloc_pd(device
);
3396 if (IS_ERR(srp_dev
->pd
))
3399 srp_dev
->mr
= ib_get_dma_mr(srp_dev
->pd
,
3400 IB_ACCESS_LOCAL_WRITE
|
3401 IB_ACCESS_REMOTE_READ
|
3402 IB_ACCESS_REMOTE_WRITE
);
3403 if (IS_ERR(srp_dev
->mr
))
3406 for (p
= rdma_start_port(device
); p
<= rdma_end_port(device
); ++p
) {
3407 host
= srp_add_port(srp_dev
, p
);
3409 list_add_tail(&host
->list
, &srp_dev
->dev_list
);
3412 ib_set_client_data(device
, &srp_client
, srp_dev
);
3417 ib_dealloc_pd(srp_dev
->pd
);
3426 static void srp_remove_one(struct ib_device
*device
, void *client_data
)
3428 struct srp_device
*srp_dev
;
3429 struct srp_host
*host
, *tmp_host
;
3430 struct srp_target_port
*target
;
3432 srp_dev
= client_data
;
3436 list_for_each_entry_safe(host
, tmp_host
, &srp_dev
->dev_list
, list
) {
3437 device_unregister(&host
->dev
);
3439 * Wait for the sysfs entry to go away, so that no new
3440 * target ports can be created.
3442 wait_for_completion(&host
->released
);
3445 * Remove all target ports.
3447 spin_lock(&host
->target_lock
);
3448 list_for_each_entry(target
, &host
->target_list
, list
)
3449 srp_queue_remove_work(target
);
3450 spin_unlock(&host
->target_lock
);
3453 * Wait for tl_err and target port removal tasks.
3455 flush_workqueue(system_long_wq
);
3456 flush_workqueue(srp_remove_wq
);
3461 ib_dereg_mr(srp_dev
->mr
);
3462 ib_dealloc_pd(srp_dev
->pd
);
3467 static struct srp_function_template ib_srp_transport_functions
= {
3468 .has_rport_state
= true,
3469 .reset_timer_if_blocked
= true,
3470 .reconnect_delay
= &srp_reconnect_delay
,
3471 .fast_io_fail_tmo
= &srp_fast_io_fail_tmo
,
3472 .dev_loss_tmo
= &srp_dev_loss_tmo
,
3473 .reconnect
= srp_rport_reconnect
,
3474 .rport_delete
= srp_rport_delete
,
3475 .terminate_rport_io
= srp_terminate_io
,
3478 static int __init
srp_init_module(void)
3482 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc
, wr_id
) < sizeof(void *));
3484 if (srp_sg_tablesize
) {
3485 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
3486 if (!cmd_sg_entries
)
3487 cmd_sg_entries
= srp_sg_tablesize
;
3490 if (!cmd_sg_entries
)
3491 cmd_sg_entries
= SRP_DEF_SG_TABLESIZE
;
3493 if (cmd_sg_entries
> 255) {
3494 pr_warn("Clamping cmd_sg_entries to 255\n");
3495 cmd_sg_entries
= 255;
3498 if (!indirect_sg_entries
)
3499 indirect_sg_entries
= cmd_sg_entries
;
3500 else if (indirect_sg_entries
< cmd_sg_entries
) {
3501 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
3503 indirect_sg_entries
= cmd_sg_entries
;
3506 srp_remove_wq
= create_workqueue("srp_remove");
3507 if (!srp_remove_wq
) {
3513 ib_srp_transport_template
=
3514 srp_attach_transport(&ib_srp_transport_functions
);
3515 if (!ib_srp_transport_template
)
3518 ret
= class_register(&srp_class
);
3520 pr_err("couldn't register class infiniband_srp\n");
3524 ib_sa_register_client(&srp_sa_client
);
3526 ret
= ib_register_client(&srp_client
);
3528 pr_err("couldn't register IB client\n");
3536 ib_sa_unregister_client(&srp_sa_client
);
3537 class_unregister(&srp_class
);
3540 srp_release_transport(ib_srp_transport_template
);
3543 destroy_workqueue(srp_remove_wq
);
3547 static void __exit
srp_cleanup_module(void)
3549 ib_unregister_client(&srp_client
);
3550 ib_sa_unregister_client(&srp_sa_client
);
3551 class_unregister(&srp_class
);
3552 srp_release_transport(ib_srp_transport_template
);
3553 destroy_workqueue(srp_remove_wq
);
3556 module_init(srp_init_module
);
3557 module_exit(srp_cleanup_module
);