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>
44 #include <linux/atomic.h>
46 #include <scsi/scsi.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_dbg.h>
49 #include <scsi/scsi_tcq.h>
51 #include <scsi/scsi_transport_srp.h>
55 #define DRV_NAME "ib_srp"
56 #define PFX DRV_NAME ": "
57 #define DRV_VERSION "1.0"
58 #define DRV_RELDATE "July 1, 2013"
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION
" (" DRV_RELDATE
")");
63 MODULE_LICENSE("Dual BSD/GPL");
65 static unsigned int srp_sg_tablesize
;
66 static unsigned int cmd_sg_entries
;
67 static unsigned int indirect_sg_entries
;
68 static bool allow_ext_sg
;
69 static bool prefer_fr
;
70 static bool register_always
;
71 static int topspin_workarounds
= 1;
73 module_param(srp_sg_tablesize
, uint
, 0444);
74 MODULE_PARM_DESC(srp_sg_tablesize
, "Deprecated name for cmd_sg_entries");
76 module_param(cmd_sg_entries
, uint
, 0444);
77 MODULE_PARM_DESC(cmd_sg_entries
,
78 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
80 module_param(indirect_sg_entries
, uint
, 0444);
81 MODULE_PARM_DESC(indirect_sg_entries
,
82 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS
) ")");
84 module_param(allow_ext_sg
, bool, 0444);
85 MODULE_PARM_DESC(allow_ext_sg
,
86 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
88 module_param(topspin_workarounds
, int, 0444);
89 MODULE_PARM_DESC(topspin_workarounds
,
90 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
92 module_param(prefer_fr
, bool, 0444);
93 MODULE_PARM_DESC(prefer_fr
,
94 "Whether to use fast registration if both FMR and fast registration are supported");
96 module_param(register_always
, bool, 0444);
97 MODULE_PARM_DESC(register_always
,
98 "Use memory registration even for contiguous memory regions");
100 static struct kernel_param_ops srp_tmo_ops
;
102 static int srp_reconnect_delay
= 10;
103 module_param_cb(reconnect_delay
, &srp_tmo_ops
, &srp_reconnect_delay
,
105 MODULE_PARM_DESC(reconnect_delay
, "Time between successive reconnect attempts");
107 static int srp_fast_io_fail_tmo
= 15;
108 module_param_cb(fast_io_fail_tmo
, &srp_tmo_ops
, &srp_fast_io_fail_tmo
,
110 MODULE_PARM_DESC(fast_io_fail_tmo
,
111 "Number of seconds between the observation of a transport"
112 " layer error and failing all I/O. \"off\" means that this"
113 " functionality is disabled.");
115 static int srp_dev_loss_tmo
= 600;
116 module_param_cb(dev_loss_tmo
, &srp_tmo_ops
, &srp_dev_loss_tmo
,
118 MODULE_PARM_DESC(dev_loss_tmo
,
119 "Maximum number of seconds that the SRP transport should"
120 " insulate transport layer errors. After this time has been"
121 " exceeded the SCSI host is removed. Should be"
122 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT
)
123 " if fast_io_fail_tmo has not been set. \"off\" means that"
124 " this functionality is disabled.");
126 static void srp_add_one(struct ib_device
*device
);
127 static void srp_remove_one(struct ib_device
*device
);
128 static void srp_recv_completion(struct ib_cq
*cq
, void *target_ptr
);
129 static void srp_send_completion(struct ib_cq
*cq
, void *target_ptr
);
130 static int srp_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
);
132 static struct scsi_transport_template
*ib_srp_transport_template
;
134 static struct ib_client srp_client
= {
137 .remove
= srp_remove_one
140 static struct ib_sa_client srp_sa_client
;
142 static int srp_tmo_get(char *buffer
, const struct kernel_param
*kp
)
144 int tmo
= *(int *)kp
->arg
;
147 return sprintf(buffer
, "%d", tmo
);
149 return sprintf(buffer
, "off");
152 static int srp_tmo_set(const char *val
, const struct kernel_param
*kp
)
156 if (strncmp(val
, "off", 3) != 0) {
157 res
= kstrtoint(val
, 0, &tmo
);
163 if (kp
->arg
== &srp_reconnect_delay
)
164 res
= srp_tmo_valid(tmo
, srp_fast_io_fail_tmo
,
166 else if (kp
->arg
== &srp_fast_io_fail_tmo
)
167 res
= srp_tmo_valid(srp_reconnect_delay
, tmo
, srp_dev_loss_tmo
);
169 res
= srp_tmo_valid(srp_reconnect_delay
, srp_fast_io_fail_tmo
,
173 *(int *)kp
->arg
= tmo
;
179 static struct kernel_param_ops srp_tmo_ops
= {
184 static inline struct srp_target_port
*host_to_target(struct Scsi_Host
*host
)
186 return (struct srp_target_port
*) host
->hostdata
;
189 static const char *srp_target_info(struct Scsi_Host
*host
)
191 return host_to_target(host
)->target_name
;
194 static int srp_target_is_topspin(struct srp_target_port
*target
)
196 static const u8 topspin_oui
[3] = { 0x00, 0x05, 0xad };
197 static const u8 cisco_oui
[3] = { 0x00, 0x1b, 0x0d };
199 return topspin_workarounds
&&
200 (!memcmp(&target
->ioc_guid
, topspin_oui
, sizeof topspin_oui
) ||
201 !memcmp(&target
->ioc_guid
, cisco_oui
, sizeof cisco_oui
));
204 static struct srp_iu
*srp_alloc_iu(struct srp_host
*host
, size_t size
,
206 enum dma_data_direction direction
)
210 iu
= kmalloc(sizeof *iu
, gfp_mask
);
214 iu
->buf
= kzalloc(size
, gfp_mask
);
218 iu
->dma
= ib_dma_map_single(host
->srp_dev
->dev
, iu
->buf
, size
,
220 if (ib_dma_mapping_error(host
->srp_dev
->dev
, iu
->dma
))
224 iu
->direction
= direction
;
236 static void srp_free_iu(struct srp_host
*host
, struct srp_iu
*iu
)
241 ib_dma_unmap_single(host
->srp_dev
->dev
, iu
->dma
, iu
->size
,
247 static void srp_qp_event(struct ib_event
*event
, void *context
)
249 pr_debug("QP event %d\n", event
->event
);
252 static int srp_init_qp(struct srp_target_port
*target
,
255 struct ib_qp_attr
*attr
;
258 attr
= kmalloc(sizeof *attr
, GFP_KERNEL
);
262 ret
= ib_find_pkey(target
->srp_host
->srp_dev
->dev
,
263 target
->srp_host
->port
,
264 be16_to_cpu(target
->path
.pkey
),
269 attr
->qp_state
= IB_QPS_INIT
;
270 attr
->qp_access_flags
= (IB_ACCESS_REMOTE_READ
|
271 IB_ACCESS_REMOTE_WRITE
);
272 attr
->port_num
= target
->srp_host
->port
;
274 ret
= ib_modify_qp(qp
, attr
,
285 static int srp_new_cm_id(struct srp_target_port
*target
)
287 struct ib_cm_id
*new_cm_id
;
289 new_cm_id
= ib_create_cm_id(target
->srp_host
->srp_dev
->dev
,
290 srp_cm_handler
, target
);
291 if (IS_ERR(new_cm_id
))
292 return PTR_ERR(new_cm_id
);
295 ib_destroy_cm_id(target
->cm_id
);
296 target
->cm_id
= new_cm_id
;
301 static struct ib_fmr_pool
*srp_alloc_fmr_pool(struct srp_target_port
*target
)
303 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
304 struct ib_fmr_pool_param fmr_param
;
306 memset(&fmr_param
, 0, sizeof(fmr_param
));
307 fmr_param
.pool_size
= target
->scsi_host
->can_queue
;
308 fmr_param
.dirty_watermark
= fmr_param
.pool_size
/ 4;
310 fmr_param
.max_pages_per_fmr
= dev
->max_pages_per_mr
;
311 fmr_param
.page_shift
= ilog2(dev
->mr_page_size
);
312 fmr_param
.access
= (IB_ACCESS_LOCAL_WRITE
|
313 IB_ACCESS_REMOTE_WRITE
|
314 IB_ACCESS_REMOTE_READ
);
316 return ib_create_fmr_pool(dev
->pd
, &fmr_param
);
320 * srp_destroy_fr_pool() - free the resources owned by a pool
321 * @pool: Fast registration pool to be destroyed.
323 static void srp_destroy_fr_pool(struct srp_fr_pool
*pool
)
326 struct srp_fr_desc
*d
;
331 for (i
= 0, d
= &pool
->desc
[0]; i
< pool
->size
; i
++, d
++) {
333 ib_free_fast_reg_page_list(d
->frpl
);
341 * srp_create_fr_pool() - allocate and initialize a pool for fast registration
342 * @device: IB device to allocate fast registration descriptors for.
343 * @pd: Protection domain associated with the FR descriptors.
344 * @pool_size: Number of descriptors to allocate.
345 * @max_page_list_len: Maximum fast registration work request page list length.
347 static struct srp_fr_pool
*srp_create_fr_pool(struct ib_device
*device
,
348 struct ib_pd
*pd
, int pool_size
,
349 int max_page_list_len
)
351 struct srp_fr_pool
*pool
;
352 struct srp_fr_desc
*d
;
354 struct ib_fast_reg_page_list
*frpl
;
355 int i
, ret
= -EINVAL
;
360 pool
= kzalloc(sizeof(struct srp_fr_pool
) +
361 pool_size
* sizeof(struct srp_fr_desc
), GFP_KERNEL
);
364 pool
->size
= pool_size
;
365 pool
->max_page_list_len
= max_page_list_len
;
366 spin_lock_init(&pool
->lock
);
367 INIT_LIST_HEAD(&pool
->free_list
);
369 for (i
= 0, d
= &pool
->desc
[0]; i
< pool
->size
; i
++, d
++) {
370 mr
= ib_alloc_fast_reg_mr(pd
, max_page_list_len
);
376 frpl
= ib_alloc_fast_reg_page_list(device
, max_page_list_len
);
382 list_add_tail(&d
->entry
, &pool
->free_list
);
389 srp_destroy_fr_pool(pool
);
397 * srp_fr_pool_get() - obtain a descriptor suitable for fast registration
398 * @pool: Pool to obtain descriptor from.
400 static struct srp_fr_desc
*srp_fr_pool_get(struct srp_fr_pool
*pool
)
402 struct srp_fr_desc
*d
= NULL
;
405 spin_lock_irqsave(&pool
->lock
, flags
);
406 if (!list_empty(&pool
->free_list
)) {
407 d
= list_first_entry(&pool
->free_list
, typeof(*d
), entry
);
410 spin_unlock_irqrestore(&pool
->lock
, flags
);
416 * srp_fr_pool_put() - put an FR descriptor back in the free list
417 * @pool: Pool the descriptor was allocated from.
418 * @desc: Pointer to an array of fast registration descriptor pointers.
419 * @n: Number of descriptors to put back.
421 * Note: The caller must already have queued an invalidation request for
422 * desc->mr->rkey before calling this function.
424 static void srp_fr_pool_put(struct srp_fr_pool
*pool
, struct srp_fr_desc
**desc
,
430 spin_lock_irqsave(&pool
->lock
, flags
);
431 for (i
= 0; i
< n
; i
++)
432 list_add(&desc
[i
]->entry
, &pool
->free_list
);
433 spin_unlock_irqrestore(&pool
->lock
, flags
);
436 static struct srp_fr_pool
*srp_alloc_fr_pool(struct srp_target_port
*target
)
438 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
440 return srp_create_fr_pool(dev
->dev
, dev
->pd
,
441 target
->scsi_host
->can_queue
,
442 dev
->max_pages_per_mr
);
445 static int srp_create_target_ib(struct srp_target_port
*target
)
447 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
448 struct ib_qp_init_attr
*init_attr
;
449 struct ib_cq
*recv_cq
, *send_cq
;
451 struct ib_fmr_pool
*fmr_pool
= NULL
;
452 struct srp_fr_pool
*fr_pool
= NULL
;
453 const int m
= 1 + dev
->use_fast_reg
;
456 init_attr
= kzalloc(sizeof *init_attr
, GFP_KERNEL
);
460 recv_cq
= ib_create_cq(dev
->dev
, srp_recv_completion
, NULL
, target
,
461 target
->queue_size
, target
->comp_vector
);
462 if (IS_ERR(recv_cq
)) {
463 ret
= PTR_ERR(recv_cq
);
467 send_cq
= ib_create_cq(dev
->dev
, srp_send_completion
, NULL
, target
,
468 m
* target
->queue_size
, target
->comp_vector
);
469 if (IS_ERR(send_cq
)) {
470 ret
= PTR_ERR(send_cq
);
474 ib_req_notify_cq(recv_cq
, IB_CQ_NEXT_COMP
);
476 init_attr
->event_handler
= srp_qp_event
;
477 init_attr
->cap
.max_send_wr
= m
* target
->queue_size
;
478 init_attr
->cap
.max_recv_wr
= target
->queue_size
;
479 init_attr
->cap
.max_recv_sge
= 1;
480 init_attr
->cap
.max_send_sge
= 1;
481 init_attr
->sq_sig_type
= IB_SIGNAL_REQ_WR
;
482 init_attr
->qp_type
= IB_QPT_RC
;
483 init_attr
->send_cq
= send_cq
;
484 init_attr
->recv_cq
= recv_cq
;
486 qp
= ib_create_qp(dev
->pd
, init_attr
);
492 ret
= srp_init_qp(target
, qp
);
496 if (dev
->use_fast_reg
&& dev
->has_fr
) {
497 fr_pool
= srp_alloc_fr_pool(target
);
498 if (IS_ERR(fr_pool
)) {
499 ret
= PTR_ERR(fr_pool
);
500 shost_printk(KERN_WARNING
, target
->scsi_host
, PFX
501 "FR pool allocation failed (%d)\n", ret
);
505 srp_destroy_fr_pool(target
->fr_pool
);
506 target
->fr_pool
= fr_pool
;
507 } else if (!dev
->use_fast_reg
&& dev
->has_fmr
) {
508 fmr_pool
= srp_alloc_fmr_pool(target
);
509 if (IS_ERR(fmr_pool
)) {
510 ret
= PTR_ERR(fmr_pool
);
511 shost_printk(KERN_WARNING
, target
->scsi_host
, PFX
512 "FMR pool allocation failed (%d)\n", ret
);
515 if (target
->fmr_pool
)
516 ib_destroy_fmr_pool(target
->fmr_pool
);
517 target
->fmr_pool
= fmr_pool
;
521 ib_destroy_qp(target
->qp
);
523 ib_destroy_cq(target
->recv_cq
);
525 ib_destroy_cq(target
->send_cq
);
528 target
->recv_cq
= recv_cq
;
529 target
->send_cq
= send_cq
;
538 ib_destroy_cq(send_cq
);
541 ib_destroy_cq(recv_cq
);
549 * Note: this function may be called without srp_alloc_iu_bufs() having been
550 * invoked. Hence the target->[rt]x_ring checks.
552 static void srp_free_target_ib(struct srp_target_port
*target
)
554 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
557 if (dev
->use_fast_reg
) {
559 srp_destroy_fr_pool(target
->fr_pool
);
561 if (target
->fmr_pool
)
562 ib_destroy_fmr_pool(target
->fmr_pool
);
564 ib_destroy_qp(target
->qp
);
565 ib_destroy_cq(target
->send_cq
);
566 ib_destroy_cq(target
->recv_cq
);
569 target
->send_cq
= target
->recv_cq
= NULL
;
571 if (target
->rx_ring
) {
572 for (i
= 0; i
< target
->queue_size
; ++i
)
573 srp_free_iu(target
->srp_host
, target
->rx_ring
[i
]);
574 kfree(target
->rx_ring
);
575 target
->rx_ring
= NULL
;
577 if (target
->tx_ring
) {
578 for (i
= 0; i
< target
->queue_size
; ++i
)
579 srp_free_iu(target
->srp_host
, target
->tx_ring
[i
]);
580 kfree(target
->tx_ring
);
581 target
->tx_ring
= NULL
;
585 static void srp_path_rec_completion(int status
,
586 struct ib_sa_path_rec
*pathrec
,
589 struct srp_target_port
*target
= target_ptr
;
591 target
->status
= status
;
593 shost_printk(KERN_ERR
, target
->scsi_host
,
594 PFX
"Got failed path rec status %d\n", status
);
596 target
->path
= *pathrec
;
597 complete(&target
->done
);
600 static int srp_lookup_path(struct srp_target_port
*target
)
604 target
->path
.numb_path
= 1;
606 init_completion(&target
->done
);
608 target
->path_query_id
= ib_sa_path_rec_get(&srp_sa_client
,
609 target
->srp_host
->srp_dev
->dev
,
610 target
->srp_host
->port
,
612 IB_SA_PATH_REC_SERVICE_ID
|
613 IB_SA_PATH_REC_DGID
|
614 IB_SA_PATH_REC_SGID
|
615 IB_SA_PATH_REC_NUMB_PATH
|
617 SRP_PATH_REC_TIMEOUT_MS
,
619 srp_path_rec_completion
,
620 target
, &target
->path_query
);
621 if (target
->path_query_id
< 0)
622 return target
->path_query_id
;
624 ret
= wait_for_completion_interruptible(&target
->done
);
628 if (target
->status
< 0)
629 shost_printk(KERN_WARNING
, target
->scsi_host
,
630 PFX
"Path record query failed\n");
632 return target
->status
;
635 static int srp_send_req(struct srp_target_port
*target
)
638 struct ib_cm_req_param param
;
639 struct srp_login_req priv
;
643 req
= kzalloc(sizeof *req
, GFP_KERNEL
);
647 req
->param
.primary_path
= &target
->path
;
648 req
->param
.alternate_path
= NULL
;
649 req
->param
.service_id
= target
->service_id
;
650 req
->param
.qp_num
= target
->qp
->qp_num
;
651 req
->param
.qp_type
= target
->qp
->qp_type
;
652 req
->param
.private_data
= &req
->priv
;
653 req
->param
.private_data_len
= sizeof req
->priv
;
654 req
->param
.flow_control
= 1;
656 get_random_bytes(&req
->param
.starting_psn
, 4);
657 req
->param
.starting_psn
&= 0xffffff;
660 * Pick some arbitrary defaults here; we could make these
661 * module parameters if anyone cared about setting them.
663 req
->param
.responder_resources
= 4;
664 req
->param
.remote_cm_response_timeout
= 20;
665 req
->param
.local_cm_response_timeout
= 20;
666 req
->param
.retry_count
= target
->tl_retry_count
;
667 req
->param
.rnr_retry_count
= 7;
668 req
->param
.max_cm_retries
= 15;
670 req
->priv
.opcode
= SRP_LOGIN_REQ
;
672 req
->priv
.req_it_iu_len
= cpu_to_be32(target
->max_iu_len
);
673 req
->priv
.req_buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
|
674 SRP_BUF_FORMAT_INDIRECT
);
676 * In the published SRP specification (draft rev. 16a), the
677 * port identifier format is 8 bytes of ID extension followed
678 * by 8 bytes of GUID. Older drafts put the two halves in the
679 * opposite order, so that the GUID comes first.
681 * Targets conforming to these obsolete drafts can be
682 * recognized by the I/O Class they report.
684 if (target
->io_class
== SRP_REV10_IB_IO_CLASS
) {
685 memcpy(req
->priv
.initiator_port_id
,
686 &target
->path
.sgid
.global
.interface_id
, 8);
687 memcpy(req
->priv
.initiator_port_id
+ 8,
688 &target
->initiator_ext
, 8);
689 memcpy(req
->priv
.target_port_id
, &target
->ioc_guid
, 8);
690 memcpy(req
->priv
.target_port_id
+ 8, &target
->id_ext
, 8);
692 memcpy(req
->priv
.initiator_port_id
,
693 &target
->initiator_ext
, 8);
694 memcpy(req
->priv
.initiator_port_id
+ 8,
695 &target
->path
.sgid
.global
.interface_id
, 8);
696 memcpy(req
->priv
.target_port_id
, &target
->id_ext
, 8);
697 memcpy(req
->priv
.target_port_id
+ 8, &target
->ioc_guid
, 8);
701 * Topspin/Cisco SRP targets will reject our login unless we
702 * zero out the first 8 bytes of our initiator port ID and set
703 * the second 8 bytes to the local node GUID.
705 if (srp_target_is_topspin(target
)) {
706 shost_printk(KERN_DEBUG
, target
->scsi_host
,
707 PFX
"Topspin/Cisco initiator port ID workaround "
708 "activated for target GUID %016llx\n",
709 (unsigned long long) be64_to_cpu(target
->ioc_guid
));
710 memset(req
->priv
.initiator_port_id
, 0, 8);
711 memcpy(req
->priv
.initiator_port_id
+ 8,
712 &target
->srp_host
->srp_dev
->dev
->node_guid
, 8);
715 status
= ib_send_cm_req(target
->cm_id
, &req
->param
);
722 static bool srp_queue_remove_work(struct srp_target_port
*target
)
724 bool changed
= false;
726 spin_lock_irq(&target
->lock
);
727 if (target
->state
!= SRP_TARGET_REMOVED
) {
728 target
->state
= SRP_TARGET_REMOVED
;
731 spin_unlock_irq(&target
->lock
);
734 queue_work(system_long_wq
, &target
->remove_work
);
739 static bool srp_change_conn_state(struct srp_target_port
*target
,
742 bool changed
= false;
744 spin_lock_irq(&target
->lock
);
745 if (target
->connected
!= connected
) {
746 target
->connected
= connected
;
749 spin_unlock_irq(&target
->lock
);
754 static void srp_disconnect_target(struct srp_target_port
*target
)
756 if (srp_change_conn_state(target
, false)) {
757 /* XXX should send SRP_I_LOGOUT request */
759 if (ib_send_cm_dreq(target
->cm_id
, NULL
, 0)) {
760 shost_printk(KERN_DEBUG
, target
->scsi_host
,
761 PFX
"Sending CM DREQ failed\n");
766 static void srp_free_req_data(struct srp_target_port
*target
)
768 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
769 struct ib_device
*ibdev
= dev
->dev
;
770 struct srp_request
*req
;
773 if (!target
->req_ring
)
776 for (i
= 0; i
< target
->req_ring_size
; ++i
) {
777 req
= &target
->req_ring
[i
];
778 if (dev
->use_fast_reg
)
781 kfree(req
->fmr_list
);
782 kfree(req
->map_page
);
783 if (req
->indirect_dma_addr
) {
784 ib_dma_unmap_single(ibdev
, req
->indirect_dma_addr
,
785 target
->indirect_size
,
788 kfree(req
->indirect_desc
);
791 kfree(target
->req_ring
);
792 target
->req_ring
= NULL
;
795 static int srp_alloc_req_data(struct srp_target_port
*target
)
797 struct srp_device
*srp_dev
= target
->srp_host
->srp_dev
;
798 struct ib_device
*ibdev
= srp_dev
->dev
;
799 struct srp_request
*req
;
802 int i
, ret
= -ENOMEM
;
804 INIT_LIST_HEAD(&target
->free_reqs
);
806 target
->req_ring
= kzalloc(target
->req_ring_size
*
807 sizeof(*target
->req_ring
), GFP_KERNEL
);
808 if (!target
->req_ring
)
811 for (i
= 0; i
< target
->req_ring_size
; ++i
) {
812 req
= &target
->req_ring
[i
];
813 mr_list
= kmalloc(target
->cmd_sg_cnt
* sizeof(void *),
817 if (srp_dev
->use_fast_reg
)
818 req
->fr_list
= mr_list
;
820 req
->fmr_list
= mr_list
;
821 req
->map_page
= kmalloc(srp_dev
->max_pages_per_mr
*
822 sizeof(void *), GFP_KERNEL
);
825 req
->indirect_desc
= kmalloc(target
->indirect_size
, GFP_KERNEL
);
826 if (!req
->indirect_desc
)
829 dma_addr
= ib_dma_map_single(ibdev
, req
->indirect_desc
,
830 target
->indirect_size
,
832 if (ib_dma_mapping_error(ibdev
, dma_addr
))
835 req
->indirect_dma_addr
= dma_addr
;
837 list_add_tail(&req
->list
, &target
->free_reqs
);
846 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
847 * @shost: SCSI host whose attributes to remove from sysfs.
849 * Note: Any attributes defined in the host template and that did not exist
850 * before invocation of this function will be ignored.
852 static void srp_del_scsi_host_attr(struct Scsi_Host
*shost
)
854 struct device_attribute
**attr
;
856 for (attr
= shost
->hostt
->shost_attrs
; attr
&& *attr
; ++attr
)
857 device_remove_file(&shost
->shost_dev
, *attr
);
860 static void srp_remove_target(struct srp_target_port
*target
)
862 WARN_ON_ONCE(target
->state
!= SRP_TARGET_REMOVED
);
864 srp_del_scsi_host_attr(target
->scsi_host
);
865 srp_rport_get(target
->rport
);
866 srp_remove_host(target
->scsi_host
);
867 scsi_remove_host(target
->scsi_host
);
868 srp_stop_rport_timers(target
->rport
);
869 srp_disconnect_target(target
);
870 ib_destroy_cm_id(target
->cm_id
);
871 srp_free_target_ib(target
);
872 cancel_work_sync(&target
->tl_err_work
);
873 srp_rport_put(target
->rport
);
874 srp_free_req_data(target
);
876 spin_lock(&target
->srp_host
->target_lock
);
877 list_del(&target
->list
);
878 spin_unlock(&target
->srp_host
->target_lock
);
880 scsi_host_put(target
->scsi_host
);
883 static void srp_remove_work(struct work_struct
*work
)
885 struct srp_target_port
*target
=
886 container_of(work
, struct srp_target_port
, remove_work
);
888 WARN_ON_ONCE(target
->state
!= SRP_TARGET_REMOVED
);
890 srp_remove_target(target
);
893 static void srp_rport_delete(struct srp_rport
*rport
)
895 struct srp_target_port
*target
= rport
->lld_data
;
897 srp_queue_remove_work(target
);
900 static int srp_connect_target(struct srp_target_port
*target
)
905 WARN_ON_ONCE(target
->connected
);
907 target
->qp_in_error
= false;
909 ret
= srp_lookup_path(target
);
914 init_completion(&target
->done
);
915 ret
= srp_send_req(target
);
918 ret
= wait_for_completion_interruptible(&target
->done
);
923 * The CM event handling code will set status to
924 * SRP_PORT_REDIRECT if we get a port redirect REJ
925 * back, or SRP_DLID_REDIRECT if we get a lid/qp
928 switch (target
->status
) {
930 srp_change_conn_state(target
, true);
933 case SRP_PORT_REDIRECT
:
934 ret
= srp_lookup_path(target
);
939 case SRP_DLID_REDIRECT
:
943 /* Our current CM id was stale, and is now in timewait.
944 * Try to reconnect with a new one.
946 if (!retries
-- || srp_new_cm_id(target
)) {
947 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
948 "giving up on stale connection\n");
949 target
->status
= -ECONNRESET
;
950 return target
->status
;
953 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
954 "retrying stale connection\n");
958 return target
->status
;
963 static int srp_inv_rkey(struct srp_target_port
*target
, u32 rkey
)
965 struct ib_send_wr
*bad_wr
;
966 struct ib_send_wr wr
= {
967 .opcode
= IB_WR_LOCAL_INV
,
968 .wr_id
= LOCAL_INV_WR_ID_MASK
,
972 .ex
.invalidate_rkey
= rkey
,
975 return ib_post_send(target
->qp
, &wr
, &bad_wr
);
978 static void srp_unmap_data(struct scsi_cmnd
*scmnd
,
979 struct srp_target_port
*target
,
980 struct srp_request
*req
)
982 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
983 struct ib_device
*ibdev
= dev
->dev
;
986 if (!scsi_sglist(scmnd
) ||
987 (scmnd
->sc_data_direction
!= DMA_TO_DEVICE
&&
988 scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
))
991 if (dev
->use_fast_reg
) {
992 struct srp_fr_desc
**pfr
;
994 for (i
= req
->nmdesc
, pfr
= req
->fr_list
; i
> 0; i
--, pfr
++) {
995 res
= srp_inv_rkey(target
, (*pfr
)->mr
->rkey
);
997 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
998 "Queueing INV WR for rkey %#x failed (%d)\n",
999 (*pfr
)->mr
->rkey
, res
);
1000 queue_work(system_long_wq
,
1001 &target
->tl_err_work
);
1005 srp_fr_pool_put(target
->fr_pool
, req
->fr_list
,
1008 struct ib_pool_fmr
**pfmr
;
1010 for (i
= req
->nmdesc
, pfmr
= req
->fmr_list
; i
> 0; i
--, pfmr
++)
1011 ib_fmr_pool_unmap(*pfmr
);
1014 ib_dma_unmap_sg(ibdev
, scsi_sglist(scmnd
), scsi_sg_count(scmnd
),
1015 scmnd
->sc_data_direction
);
1019 * srp_claim_req - Take ownership of the scmnd associated with a request.
1020 * @target: SRP target port.
1021 * @req: SRP request.
1022 * @sdev: If not NULL, only take ownership for this SCSI device.
1023 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
1024 * ownership of @req->scmnd if it equals @scmnd.
1027 * Either NULL or a pointer to the SCSI command the caller became owner of.
1029 static struct scsi_cmnd
*srp_claim_req(struct srp_target_port
*target
,
1030 struct srp_request
*req
,
1031 struct scsi_device
*sdev
,
1032 struct scsi_cmnd
*scmnd
)
1034 unsigned long flags
;
1036 spin_lock_irqsave(&target
->lock
, flags
);
1038 (!sdev
|| req
->scmnd
->device
== sdev
) &&
1039 (!scmnd
|| req
->scmnd
== scmnd
)) {
1045 spin_unlock_irqrestore(&target
->lock
, flags
);
1051 * srp_free_req() - Unmap data and add request to the free request list.
1052 * @target: SRP target port.
1053 * @req: Request to be freed.
1054 * @scmnd: SCSI command associated with @req.
1055 * @req_lim_delta: Amount to be added to @target->req_lim.
1057 static void srp_free_req(struct srp_target_port
*target
,
1058 struct srp_request
*req
, struct scsi_cmnd
*scmnd
,
1061 unsigned long flags
;
1063 srp_unmap_data(scmnd
, target
, req
);
1065 spin_lock_irqsave(&target
->lock
, flags
);
1066 target
->req_lim
+= req_lim_delta
;
1067 list_add_tail(&req
->list
, &target
->free_reqs
);
1068 spin_unlock_irqrestore(&target
->lock
, flags
);
1071 static void srp_finish_req(struct srp_target_port
*target
,
1072 struct srp_request
*req
, struct scsi_device
*sdev
,
1075 struct scsi_cmnd
*scmnd
= srp_claim_req(target
, req
, sdev
, NULL
);
1078 srp_free_req(target
, req
, scmnd
, 0);
1079 scmnd
->result
= result
;
1080 scmnd
->scsi_done(scmnd
);
1084 static void srp_terminate_io(struct srp_rport
*rport
)
1086 struct srp_target_port
*target
= rport
->lld_data
;
1087 struct Scsi_Host
*shost
= target
->scsi_host
;
1088 struct scsi_device
*sdev
;
1092 * Invoking srp_terminate_io() while srp_queuecommand() is running
1093 * is not safe. Hence the warning statement below.
1095 shost_for_each_device(sdev
, shost
)
1096 WARN_ON_ONCE(sdev
->request_queue
->request_fn_active
);
1098 for (i
= 0; i
< target
->req_ring_size
; ++i
) {
1099 struct srp_request
*req
= &target
->req_ring
[i
];
1100 srp_finish_req(target
, req
, NULL
, DID_TRANSPORT_FAILFAST
<< 16);
1105 * It is up to the caller to ensure that srp_rport_reconnect() calls are
1106 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
1107 * srp_reset_device() or srp_reset_host() calls will occur while this function
1108 * is in progress. One way to realize that is not to call this function
1109 * directly but to call srp_reconnect_rport() instead since that last function
1110 * serializes calls of this function via rport->mutex and also blocks
1111 * srp_queuecommand() calls before invoking this function.
1113 static int srp_rport_reconnect(struct srp_rport
*rport
)
1115 struct srp_target_port
*target
= rport
->lld_data
;
1118 srp_disconnect_target(target
);
1120 * Now get a new local CM ID so that we avoid confusing the target in
1121 * case things are really fouled up. Doing so also ensures that all CM
1122 * callbacks will have finished before a new QP is allocated.
1124 ret
= srp_new_cm_id(target
);
1126 for (i
= 0; i
< target
->req_ring_size
; ++i
) {
1127 struct srp_request
*req
= &target
->req_ring
[i
];
1128 srp_finish_req(target
, req
, NULL
, DID_RESET
<< 16);
1132 * Whether or not creating a new CM ID succeeded, create a new
1133 * QP. This guarantees that all callback functions for the old QP have
1134 * finished before any send requests are posted on the new QP.
1136 ret
+= srp_create_target_ib(target
);
1138 INIT_LIST_HEAD(&target
->free_tx
);
1139 for (i
= 0; i
< target
->queue_size
; ++i
)
1140 list_add(&target
->tx_ring
[i
]->list
, &target
->free_tx
);
1143 ret
= srp_connect_target(target
);
1146 shost_printk(KERN_INFO
, target
->scsi_host
,
1147 PFX
"reconnect succeeded\n");
1152 static void srp_map_desc(struct srp_map_state
*state
, dma_addr_t dma_addr
,
1153 unsigned int dma_len
, u32 rkey
)
1155 struct srp_direct_buf
*desc
= state
->desc
;
1157 desc
->va
= cpu_to_be64(dma_addr
);
1158 desc
->key
= cpu_to_be32(rkey
);
1159 desc
->len
= cpu_to_be32(dma_len
);
1161 state
->total_len
+= dma_len
;
1166 static int srp_map_finish_fmr(struct srp_map_state
*state
,
1167 struct srp_target_port
*target
)
1169 struct ib_pool_fmr
*fmr
;
1172 fmr
= ib_fmr_pool_map_phys(target
->fmr_pool
, state
->pages
,
1173 state
->npages
, io_addr
);
1175 return PTR_ERR(fmr
);
1177 *state
->next_fmr
++ = fmr
;
1180 srp_map_desc(state
, 0, state
->dma_len
, fmr
->fmr
->rkey
);
1185 static int srp_map_finish_fr(struct srp_map_state
*state
,
1186 struct srp_target_port
*target
)
1188 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
1189 struct ib_send_wr
*bad_wr
;
1190 struct ib_send_wr wr
;
1191 struct srp_fr_desc
*desc
;
1194 desc
= srp_fr_pool_get(target
->fr_pool
);
1198 rkey
= ib_inc_rkey(desc
->mr
->rkey
);
1199 ib_update_fast_reg_key(desc
->mr
, rkey
);
1201 memcpy(desc
->frpl
->page_list
, state
->pages
,
1202 sizeof(state
->pages
[0]) * state
->npages
);
1204 memset(&wr
, 0, sizeof(wr
));
1205 wr
.opcode
= IB_WR_FAST_REG_MR
;
1206 wr
.wr_id
= FAST_REG_WR_ID_MASK
;
1207 wr
.wr
.fast_reg
.iova_start
= state
->base_dma_addr
;
1208 wr
.wr
.fast_reg
.page_list
= desc
->frpl
;
1209 wr
.wr
.fast_reg
.page_list_len
= state
->npages
;
1210 wr
.wr
.fast_reg
.page_shift
= ilog2(dev
->mr_page_size
);
1211 wr
.wr
.fast_reg
.length
= state
->dma_len
;
1212 wr
.wr
.fast_reg
.access_flags
= (IB_ACCESS_LOCAL_WRITE
|
1213 IB_ACCESS_REMOTE_READ
|
1214 IB_ACCESS_REMOTE_WRITE
);
1215 wr
.wr
.fast_reg
.rkey
= desc
->mr
->lkey
;
1217 *state
->next_fr
++ = desc
;
1220 srp_map_desc(state
, state
->base_dma_addr
, state
->dma_len
,
1223 return ib_post_send(target
->qp
, &wr
, &bad_wr
);
1226 static int srp_finish_mapping(struct srp_map_state
*state
,
1227 struct srp_target_port
*target
)
1231 if (state
->npages
== 0)
1234 if (state
->npages
== 1 && !register_always
)
1235 srp_map_desc(state
, state
->base_dma_addr
, state
->dma_len
,
1238 ret
= target
->srp_host
->srp_dev
->use_fast_reg
?
1239 srp_map_finish_fr(state
, target
) :
1240 srp_map_finish_fmr(state
, target
);
1250 static void srp_map_update_start(struct srp_map_state
*state
,
1251 struct scatterlist
*sg
, int sg_index
,
1252 dma_addr_t dma_addr
)
1254 state
->unmapped_sg
= sg
;
1255 state
->unmapped_index
= sg_index
;
1256 state
->unmapped_addr
= dma_addr
;
1259 static int srp_map_sg_entry(struct srp_map_state
*state
,
1260 struct srp_target_port
*target
,
1261 struct scatterlist
*sg
, int sg_index
,
1264 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
1265 struct ib_device
*ibdev
= dev
->dev
;
1266 dma_addr_t dma_addr
= ib_sg_dma_address(ibdev
, sg
);
1267 unsigned int dma_len
= ib_sg_dma_len(ibdev
, sg
);
1276 * Once we're in direct map mode for a request, we don't
1277 * go back to FMR or FR mode, so no need to update anything
1278 * other than the descriptor.
1280 srp_map_desc(state
, dma_addr
, dma_len
, target
->rkey
);
1285 * Since not all RDMA HW drivers support non-zero page offsets for
1286 * FMR, if we start at an offset into a page, don't merge into the
1287 * current FMR mapping. Finish it out, and use the kernel's MR for
1290 if ((!dev
->use_fast_reg
&& dma_addr
& ~dev
->mr_page_mask
) ||
1291 dma_len
> dev
->mr_max_size
) {
1292 ret
= srp_finish_mapping(state
, target
);
1296 srp_map_desc(state
, dma_addr
, dma_len
, target
->rkey
);
1297 srp_map_update_start(state
, NULL
, 0, 0);
1302 * If this is the first sg that will be mapped via FMR or via FR, save
1303 * our position. We need to know the first unmapped entry, its index,
1304 * and the first unmapped address within that entry to be able to
1305 * restart mapping after an error.
1307 if (!state
->unmapped_sg
)
1308 srp_map_update_start(state
, sg
, sg_index
, dma_addr
);
1311 unsigned offset
= dma_addr
& ~dev
->mr_page_mask
;
1312 if (state
->npages
== dev
->max_pages_per_mr
|| offset
!= 0) {
1313 ret
= srp_finish_mapping(state
, target
);
1317 srp_map_update_start(state
, sg
, sg_index
, dma_addr
);
1320 len
= min_t(unsigned int, dma_len
, dev
->mr_page_size
- offset
);
1323 state
->base_dma_addr
= dma_addr
;
1324 state
->pages
[state
->npages
++] = dma_addr
& dev
->mr_page_mask
;
1325 state
->dma_len
+= len
;
1331 * If the last entry of the MR wasn't a full page, then we need to
1332 * close it out and start a new one -- we can only merge at page
1336 if (len
!= dev
->mr_page_size
) {
1337 ret
= srp_finish_mapping(state
, target
);
1339 srp_map_update_start(state
, NULL
, 0, 0);
1344 static int srp_map_sg(struct srp_map_state
*state
,
1345 struct srp_target_port
*target
, struct srp_request
*req
,
1346 struct scatterlist
*scat
, int count
)
1348 struct srp_device
*dev
= target
->srp_host
->srp_dev
;
1349 struct ib_device
*ibdev
= dev
->dev
;
1350 struct scatterlist
*sg
;
1354 state
->desc
= req
->indirect_desc
;
1355 state
->pages
= req
->map_page
;
1356 if (dev
->use_fast_reg
) {
1357 state
->next_fr
= req
->fr_list
;
1358 use_mr
= !!target
->fr_pool
;
1360 state
->next_fmr
= req
->fmr_list
;
1361 use_mr
= !!target
->fmr_pool
;
1364 for_each_sg(scat
, sg
, count
, i
) {
1365 if (srp_map_sg_entry(state
, target
, sg
, i
, use_mr
)) {
1367 * Memory registration failed, so backtrack to the
1368 * first unmapped entry and continue on without using
1369 * memory registration.
1371 dma_addr_t dma_addr
;
1372 unsigned int dma_len
;
1375 sg
= state
->unmapped_sg
;
1376 i
= state
->unmapped_index
;
1378 dma_addr
= ib_sg_dma_address(ibdev
, sg
);
1379 dma_len
= ib_sg_dma_len(ibdev
, sg
);
1380 dma_len
-= (state
->unmapped_addr
- dma_addr
);
1381 dma_addr
= state
->unmapped_addr
;
1383 srp_map_desc(state
, dma_addr
, dma_len
, target
->rkey
);
1387 if (use_mr
&& srp_finish_mapping(state
, target
))
1390 req
->nmdesc
= state
->nmdesc
;
1395 static int srp_map_data(struct scsi_cmnd
*scmnd
, struct srp_target_port
*target
,
1396 struct srp_request
*req
)
1398 struct scatterlist
*scat
;
1399 struct srp_cmd
*cmd
= req
->cmd
->buf
;
1400 int len
, nents
, count
;
1401 struct srp_device
*dev
;
1402 struct ib_device
*ibdev
;
1403 struct srp_map_state state
;
1404 struct srp_indirect_buf
*indirect_hdr
;
1408 if (!scsi_sglist(scmnd
) || scmnd
->sc_data_direction
== DMA_NONE
)
1409 return sizeof (struct srp_cmd
);
1411 if (scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
&&
1412 scmnd
->sc_data_direction
!= DMA_TO_DEVICE
) {
1413 shost_printk(KERN_WARNING
, target
->scsi_host
,
1414 PFX
"Unhandled data direction %d\n",
1415 scmnd
->sc_data_direction
);
1419 nents
= scsi_sg_count(scmnd
);
1420 scat
= scsi_sglist(scmnd
);
1422 dev
= target
->srp_host
->srp_dev
;
1425 count
= ib_dma_map_sg(ibdev
, scat
, nents
, scmnd
->sc_data_direction
);
1426 if (unlikely(count
== 0))
1429 fmt
= SRP_DATA_DESC_DIRECT
;
1430 len
= sizeof (struct srp_cmd
) + sizeof (struct srp_direct_buf
);
1432 if (count
== 1 && !register_always
) {
1434 * The midlayer only generated a single gather/scatter
1435 * entry, or DMA mapping coalesced everything to a
1436 * single entry. So a direct descriptor along with
1437 * the DMA MR suffices.
1439 struct srp_direct_buf
*buf
= (void *) cmd
->add_data
;
1441 buf
->va
= cpu_to_be64(ib_sg_dma_address(ibdev
, scat
));
1442 buf
->key
= cpu_to_be32(target
->rkey
);
1443 buf
->len
= cpu_to_be32(ib_sg_dma_len(ibdev
, scat
));
1450 * We have more than one scatter/gather entry, so build our indirect
1451 * descriptor table, trying to merge as many entries as we can.
1453 indirect_hdr
= (void *) cmd
->add_data
;
1455 ib_dma_sync_single_for_cpu(ibdev
, req
->indirect_dma_addr
,
1456 target
->indirect_size
, DMA_TO_DEVICE
);
1458 memset(&state
, 0, sizeof(state
));
1459 srp_map_sg(&state
, target
, req
, scat
, count
);
1461 /* We've mapped the request, now pull as much of the indirect
1462 * descriptor table as we can into the command buffer. If this
1463 * target is not using an external indirect table, we are
1464 * guaranteed to fit into the command, as the SCSI layer won't
1465 * give us more S/G entries than we allow.
1467 if (state
.ndesc
== 1) {
1469 * Memory registration collapsed the sg-list into one entry,
1470 * so use a direct descriptor.
1472 struct srp_direct_buf
*buf
= (void *) cmd
->add_data
;
1474 *buf
= req
->indirect_desc
[0];
1478 if (unlikely(target
->cmd_sg_cnt
< state
.ndesc
&&
1479 !target
->allow_ext_sg
)) {
1480 shost_printk(KERN_ERR
, target
->scsi_host
,
1481 "Could not fit S/G list into SRP_CMD\n");
1485 count
= min(state
.ndesc
, target
->cmd_sg_cnt
);
1486 table_len
= state
.ndesc
* sizeof (struct srp_direct_buf
);
1488 fmt
= SRP_DATA_DESC_INDIRECT
;
1489 len
= sizeof(struct srp_cmd
) + sizeof (struct srp_indirect_buf
);
1490 len
+= count
* sizeof (struct srp_direct_buf
);
1492 memcpy(indirect_hdr
->desc_list
, req
->indirect_desc
,
1493 count
* sizeof (struct srp_direct_buf
));
1495 indirect_hdr
->table_desc
.va
= cpu_to_be64(req
->indirect_dma_addr
);
1496 indirect_hdr
->table_desc
.key
= cpu_to_be32(target
->rkey
);
1497 indirect_hdr
->table_desc
.len
= cpu_to_be32(table_len
);
1498 indirect_hdr
->len
= cpu_to_be32(state
.total_len
);
1500 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
1501 cmd
->data_out_desc_cnt
= count
;
1503 cmd
->data_in_desc_cnt
= count
;
1505 ib_dma_sync_single_for_device(ibdev
, req
->indirect_dma_addr
, table_len
,
1509 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
1510 cmd
->buf_fmt
= fmt
<< 4;
1518 * Return an IU and possible credit to the free pool
1520 static void srp_put_tx_iu(struct srp_target_port
*target
, struct srp_iu
*iu
,
1521 enum srp_iu_type iu_type
)
1523 unsigned long flags
;
1525 spin_lock_irqsave(&target
->lock
, flags
);
1526 list_add(&iu
->list
, &target
->free_tx
);
1527 if (iu_type
!= SRP_IU_RSP
)
1529 spin_unlock_irqrestore(&target
->lock
, flags
);
1533 * Must be called with target->lock held to protect req_lim and free_tx.
1534 * If IU is not sent, it must be returned using srp_put_tx_iu().
1537 * An upper limit for the number of allocated information units for each
1539 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1540 * more than Scsi_Host.can_queue requests.
1541 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1542 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1543 * one unanswered SRP request to an initiator.
1545 static struct srp_iu
*__srp_get_tx_iu(struct srp_target_port
*target
,
1546 enum srp_iu_type iu_type
)
1548 s32 rsv
= (iu_type
== SRP_IU_TSK_MGMT
) ? 0 : SRP_TSK_MGMT_SQ_SIZE
;
1551 srp_send_completion(target
->send_cq
, target
);
1553 if (list_empty(&target
->free_tx
))
1556 /* Initiator responses to target requests do not consume credits */
1557 if (iu_type
!= SRP_IU_RSP
) {
1558 if (target
->req_lim
<= rsv
) {
1559 ++target
->zero_req_lim
;
1566 iu
= list_first_entry(&target
->free_tx
, struct srp_iu
, list
);
1567 list_del(&iu
->list
);
1571 static int srp_post_send(struct srp_target_port
*target
,
1572 struct srp_iu
*iu
, int len
)
1575 struct ib_send_wr wr
, *bad_wr
;
1577 list
.addr
= iu
->dma
;
1579 list
.lkey
= target
->lkey
;
1582 wr
.wr_id
= (uintptr_t) iu
;
1585 wr
.opcode
= IB_WR_SEND
;
1586 wr
.send_flags
= IB_SEND_SIGNALED
;
1588 return ib_post_send(target
->qp
, &wr
, &bad_wr
);
1591 static int srp_post_recv(struct srp_target_port
*target
, struct srp_iu
*iu
)
1593 struct ib_recv_wr wr
, *bad_wr
;
1596 list
.addr
= iu
->dma
;
1597 list
.length
= iu
->size
;
1598 list
.lkey
= target
->lkey
;
1601 wr
.wr_id
= (uintptr_t) iu
;
1605 return ib_post_recv(target
->qp
, &wr
, &bad_wr
);
1608 static void srp_process_rsp(struct srp_target_port
*target
, struct srp_rsp
*rsp
)
1610 struct srp_request
*req
;
1611 struct scsi_cmnd
*scmnd
;
1612 unsigned long flags
;
1614 if (unlikely(rsp
->tag
& SRP_TAG_TSK_MGMT
)) {
1615 spin_lock_irqsave(&target
->lock
, flags
);
1616 target
->req_lim
+= be32_to_cpu(rsp
->req_lim_delta
);
1617 spin_unlock_irqrestore(&target
->lock
, flags
);
1619 target
->tsk_mgmt_status
= -1;
1620 if (be32_to_cpu(rsp
->resp_data_len
) >= 4)
1621 target
->tsk_mgmt_status
= rsp
->data
[3];
1622 complete(&target
->tsk_mgmt_done
);
1624 req
= &target
->req_ring
[rsp
->tag
];
1625 scmnd
= srp_claim_req(target
, req
, NULL
, NULL
);
1627 shost_printk(KERN_ERR
, target
->scsi_host
,
1628 "Null scmnd for RSP w/tag %016llx\n",
1629 (unsigned long long) rsp
->tag
);
1631 spin_lock_irqsave(&target
->lock
, flags
);
1632 target
->req_lim
+= be32_to_cpu(rsp
->req_lim_delta
);
1633 spin_unlock_irqrestore(&target
->lock
, flags
);
1637 scmnd
->result
= rsp
->status
;
1639 if (rsp
->flags
& SRP_RSP_FLAG_SNSVALID
) {
1640 memcpy(scmnd
->sense_buffer
, rsp
->data
+
1641 be32_to_cpu(rsp
->resp_data_len
),
1642 min_t(int, be32_to_cpu(rsp
->sense_data_len
),
1643 SCSI_SENSE_BUFFERSIZE
));
1646 if (rsp
->flags
& (SRP_RSP_FLAG_DOOVER
| SRP_RSP_FLAG_DOUNDER
))
1647 scsi_set_resid(scmnd
, be32_to_cpu(rsp
->data_out_res_cnt
));
1648 else if (rsp
->flags
& (SRP_RSP_FLAG_DIOVER
| SRP_RSP_FLAG_DIUNDER
))
1649 scsi_set_resid(scmnd
, be32_to_cpu(rsp
->data_in_res_cnt
));
1651 srp_free_req(target
, req
, scmnd
,
1652 be32_to_cpu(rsp
->req_lim_delta
));
1654 scmnd
->host_scribble
= NULL
;
1655 scmnd
->scsi_done(scmnd
);
1659 static int srp_response_common(struct srp_target_port
*target
, s32 req_delta
,
1662 struct ib_device
*dev
= target
->srp_host
->srp_dev
->dev
;
1663 unsigned long flags
;
1667 spin_lock_irqsave(&target
->lock
, flags
);
1668 target
->req_lim
+= req_delta
;
1669 iu
= __srp_get_tx_iu(target
, SRP_IU_RSP
);
1670 spin_unlock_irqrestore(&target
->lock
, flags
);
1673 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1674 "no IU available to send response\n");
1678 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, len
, DMA_TO_DEVICE
);
1679 memcpy(iu
->buf
, rsp
, len
);
1680 ib_dma_sync_single_for_device(dev
, iu
->dma
, len
, DMA_TO_DEVICE
);
1682 err
= srp_post_send(target
, iu
, len
);
1684 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1685 "unable to post response: %d\n", err
);
1686 srp_put_tx_iu(target
, iu
, SRP_IU_RSP
);
1692 static void srp_process_cred_req(struct srp_target_port
*target
,
1693 struct srp_cred_req
*req
)
1695 struct srp_cred_rsp rsp
= {
1696 .opcode
= SRP_CRED_RSP
,
1699 s32 delta
= be32_to_cpu(req
->req_lim_delta
);
1701 if (srp_response_common(target
, delta
, &rsp
, sizeof rsp
))
1702 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1703 "problems processing SRP_CRED_REQ\n");
1706 static void srp_process_aer_req(struct srp_target_port
*target
,
1707 struct srp_aer_req
*req
)
1709 struct srp_aer_rsp rsp
= {
1710 .opcode
= SRP_AER_RSP
,
1713 s32 delta
= be32_to_cpu(req
->req_lim_delta
);
1715 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1716 "ignoring AER for LUN %llu\n", be64_to_cpu(req
->lun
));
1718 if (srp_response_common(target
, delta
, &rsp
, sizeof rsp
))
1719 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1720 "problems processing SRP_AER_REQ\n");
1723 static void srp_handle_recv(struct srp_target_port
*target
, struct ib_wc
*wc
)
1725 struct ib_device
*dev
= target
->srp_host
->srp_dev
->dev
;
1726 struct srp_iu
*iu
= (struct srp_iu
*) (uintptr_t) wc
->wr_id
;
1730 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, target
->max_ti_iu_len
,
1733 opcode
= *(u8
*) iu
->buf
;
1736 shost_printk(KERN_ERR
, target
->scsi_host
,
1737 PFX
"recv completion, opcode 0x%02x\n", opcode
);
1738 print_hex_dump(KERN_ERR
, "", DUMP_PREFIX_OFFSET
, 8, 1,
1739 iu
->buf
, wc
->byte_len
, true);
1744 srp_process_rsp(target
, iu
->buf
);
1748 srp_process_cred_req(target
, iu
->buf
);
1752 srp_process_aer_req(target
, iu
->buf
);
1756 /* XXX Handle target logout */
1757 shost_printk(KERN_WARNING
, target
->scsi_host
,
1758 PFX
"Got target logout request\n");
1762 shost_printk(KERN_WARNING
, target
->scsi_host
,
1763 PFX
"Unhandled SRP opcode 0x%02x\n", opcode
);
1767 ib_dma_sync_single_for_device(dev
, iu
->dma
, target
->max_ti_iu_len
,
1770 res
= srp_post_recv(target
, iu
);
1772 shost_printk(KERN_ERR
, target
->scsi_host
,
1773 PFX
"Recv failed with error code %d\n", res
);
1777 * srp_tl_err_work() - handle a transport layer error
1778 * @work: Work structure embedded in an SRP target port.
1780 * Note: This function may get invoked before the rport has been created,
1781 * hence the target->rport test.
1783 static void srp_tl_err_work(struct work_struct
*work
)
1785 struct srp_target_port
*target
;
1787 target
= container_of(work
, struct srp_target_port
, tl_err_work
);
1789 srp_start_tl_fail_timers(target
->rport
);
1792 static void srp_handle_qp_err(u64 wr_id
, enum ib_wc_status wc_status
,
1793 bool send_err
, struct srp_target_port
*target
)
1795 if (target
->connected
&& !target
->qp_in_error
) {
1796 if (wr_id
& LOCAL_INV_WR_ID_MASK
) {
1797 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1798 "LOCAL_INV failed with status %d\n",
1800 } else if (wr_id
& FAST_REG_WR_ID_MASK
) {
1801 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
1802 "FAST_REG_MR failed status %d\n",
1805 shost_printk(KERN_ERR
, target
->scsi_host
,
1806 PFX
"failed %s status %d for iu %p\n",
1807 send_err
? "send" : "receive",
1808 wc_status
, (void *)(uintptr_t)wr_id
);
1810 queue_work(system_long_wq
, &target
->tl_err_work
);
1812 target
->qp_in_error
= true;
1815 static void srp_recv_completion(struct ib_cq
*cq
, void *target_ptr
)
1817 struct srp_target_port
*target
= target_ptr
;
1820 ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
1821 while (ib_poll_cq(cq
, 1, &wc
) > 0) {
1822 if (likely(wc
.status
== IB_WC_SUCCESS
)) {
1823 srp_handle_recv(target
, &wc
);
1825 srp_handle_qp_err(wc
.wr_id
, wc
.status
, false, target
);
1830 static void srp_send_completion(struct ib_cq
*cq
, void *target_ptr
)
1832 struct srp_target_port
*target
= target_ptr
;
1836 while (ib_poll_cq(cq
, 1, &wc
) > 0) {
1837 if (likely(wc
.status
== IB_WC_SUCCESS
)) {
1838 iu
= (struct srp_iu
*) (uintptr_t) wc
.wr_id
;
1839 list_add(&iu
->list
, &target
->free_tx
);
1841 srp_handle_qp_err(wc
.wr_id
, wc
.status
, true, target
);
1846 static int srp_queuecommand(struct Scsi_Host
*shost
, struct scsi_cmnd
*scmnd
)
1848 struct srp_target_port
*target
= host_to_target(shost
);
1849 struct srp_rport
*rport
= target
->rport
;
1850 struct srp_request
*req
;
1852 struct srp_cmd
*cmd
;
1853 struct ib_device
*dev
;
1854 unsigned long flags
;
1856 const bool in_scsi_eh
= !in_interrupt() && current
== shost
->ehandler
;
1859 * The SCSI EH thread is the only context from which srp_queuecommand()
1860 * can get invoked for blocked devices (SDEV_BLOCK /
1861 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1862 * locking the rport mutex if invoked from inside the SCSI EH.
1865 mutex_lock(&rport
->mutex
);
1867 scmnd
->result
= srp_chkready(target
->rport
);
1868 if (unlikely(scmnd
->result
))
1871 spin_lock_irqsave(&target
->lock
, flags
);
1872 iu
= __srp_get_tx_iu(target
, SRP_IU_CMD
);
1876 req
= list_first_entry(&target
->free_reqs
, struct srp_request
, list
);
1877 list_del(&req
->list
);
1878 spin_unlock_irqrestore(&target
->lock
, flags
);
1880 dev
= target
->srp_host
->srp_dev
->dev
;
1881 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, target
->max_iu_len
,
1884 scmnd
->host_scribble
= (void *) req
;
1887 memset(cmd
, 0, sizeof *cmd
);
1889 cmd
->opcode
= SRP_CMD
;
1890 cmd
->lun
= cpu_to_be64((u64
) scmnd
->device
->lun
<< 48);
1891 cmd
->tag
= req
->index
;
1892 memcpy(cmd
->cdb
, scmnd
->cmnd
, scmnd
->cmd_len
);
1897 len
= srp_map_data(scmnd
, target
, req
);
1899 shost_printk(KERN_ERR
, target
->scsi_host
,
1900 PFX
"Failed to map data (%d)\n", len
);
1902 * If we ran out of memory descriptors (-ENOMEM) because an
1903 * application is queuing many requests with more than
1904 * max_pages_per_mr sg-list elements, tell the SCSI mid-layer
1905 * to reduce queue depth temporarily.
1907 scmnd
->result
= len
== -ENOMEM
?
1908 DID_OK
<< 16 | QUEUE_FULL
<< 1 : DID_ERROR
<< 16;
1912 ib_dma_sync_single_for_device(dev
, iu
->dma
, target
->max_iu_len
,
1915 if (srp_post_send(target
, iu
, len
)) {
1916 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
"Send failed\n");
1924 mutex_unlock(&rport
->mutex
);
1929 srp_unmap_data(scmnd
, target
, req
);
1932 srp_put_tx_iu(target
, iu
, SRP_IU_CMD
);
1935 * Avoid that the loops that iterate over the request ring can
1936 * encounter a dangling SCSI command pointer.
1940 spin_lock_irqsave(&target
->lock
, flags
);
1941 list_add(&req
->list
, &target
->free_reqs
);
1944 spin_unlock_irqrestore(&target
->lock
, flags
);
1947 if (scmnd
->result
) {
1948 scmnd
->scsi_done(scmnd
);
1951 ret
= SCSI_MLQUEUE_HOST_BUSY
;
1958 * Note: the resources allocated in this function are freed in
1959 * srp_free_target_ib().
1961 static int srp_alloc_iu_bufs(struct srp_target_port
*target
)
1965 target
->rx_ring
= kzalloc(target
->queue_size
* sizeof(*target
->rx_ring
),
1967 if (!target
->rx_ring
)
1969 target
->tx_ring
= kzalloc(target
->queue_size
* sizeof(*target
->tx_ring
),
1971 if (!target
->tx_ring
)
1974 for (i
= 0; i
< target
->queue_size
; ++i
) {
1975 target
->rx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
1976 target
->max_ti_iu_len
,
1977 GFP_KERNEL
, DMA_FROM_DEVICE
);
1978 if (!target
->rx_ring
[i
])
1982 for (i
= 0; i
< target
->queue_size
; ++i
) {
1983 target
->tx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
1985 GFP_KERNEL
, DMA_TO_DEVICE
);
1986 if (!target
->tx_ring
[i
])
1989 list_add(&target
->tx_ring
[i
]->list
, &target
->free_tx
);
1995 for (i
= 0; i
< target
->queue_size
; ++i
) {
1996 srp_free_iu(target
->srp_host
, target
->rx_ring
[i
]);
1997 srp_free_iu(target
->srp_host
, target
->tx_ring
[i
]);
2002 kfree(target
->tx_ring
);
2003 target
->tx_ring
= NULL
;
2004 kfree(target
->rx_ring
);
2005 target
->rx_ring
= NULL
;
2010 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr
*qp_attr
, int attr_mask
)
2012 uint64_t T_tr_ns
, max_compl_time_ms
;
2013 uint32_t rq_tmo_jiffies
;
2016 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
2017 * table 91), both the QP timeout and the retry count have to be set
2018 * for RC QP's during the RTR to RTS transition.
2020 WARN_ON_ONCE((attr_mask
& (IB_QP_TIMEOUT
| IB_QP_RETRY_CNT
)) !=
2021 (IB_QP_TIMEOUT
| IB_QP_RETRY_CNT
));
2024 * Set target->rq_tmo_jiffies to one second more than the largest time
2025 * it can take before an error completion is generated. See also
2026 * C9-140..142 in the IBTA spec for more information about how to
2027 * convert the QP Local ACK Timeout value to nanoseconds.
2029 T_tr_ns
= 4096 * (1ULL << qp_attr
->timeout
);
2030 max_compl_time_ms
= qp_attr
->retry_cnt
* 4 * T_tr_ns
;
2031 do_div(max_compl_time_ms
, NSEC_PER_MSEC
);
2032 rq_tmo_jiffies
= msecs_to_jiffies(max_compl_time_ms
+ 1000);
2034 return rq_tmo_jiffies
;
2037 static void srp_cm_rep_handler(struct ib_cm_id
*cm_id
,
2038 struct srp_login_rsp
*lrsp
,
2039 struct srp_target_port
*target
)
2041 struct ib_qp_attr
*qp_attr
= NULL
;
2046 if (lrsp
->opcode
== SRP_LOGIN_RSP
) {
2047 target
->max_ti_iu_len
= be32_to_cpu(lrsp
->max_ti_iu_len
);
2048 target
->req_lim
= be32_to_cpu(lrsp
->req_lim_delta
);
2051 * Reserve credits for task management so we don't
2052 * bounce requests back to the SCSI mid-layer.
2054 target
->scsi_host
->can_queue
2055 = min(target
->req_lim
- SRP_TSK_MGMT_SQ_SIZE
,
2056 target
->scsi_host
->can_queue
);
2057 target
->scsi_host
->cmd_per_lun
2058 = min_t(int, target
->scsi_host
->can_queue
,
2059 target
->scsi_host
->cmd_per_lun
);
2061 shost_printk(KERN_WARNING
, target
->scsi_host
,
2062 PFX
"Unhandled RSP opcode %#x\n", lrsp
->opcode
);
2067 if (!target
->rx_ring
) {
2068 ret
= srp_alloc_iu_bufs(target
);
2074 qp_attr
= kmalloc(sizeof *qp_attr
, GFP_KERNEL
);
2078 qp_attr
->qp_state
= IB_QPS_RTR
;
2079 ret
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
2083 ret
= ib_modify_qp(target
->qp
, qp_attr
, attr_mask
);
2087 for (i
= 0; i
< target
->queue_size
; i
++) {
2088 struct srp_iu
*iu
= target
->rx_ring
[i
];
2089 ret
= srp_post_recv(target
, iu
);
2094 qp_attr
->qp_state
= IB_QPS_RTS
;
2095 ret
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
2099 target
->rq_tmo_jiffies
= srp_compute_rq_tmo(qp_attr
, attr_mask
);
2101 ret
= ib_modify_qp(target
->qp
, qp_attr
, attr_mask
);
2105 ret
= ib_send_cm_rtu(cm_id
, NULL
, 0);
2111 target
->status
= ret
;
2114 static void srp_cm_rej_handler(struct ib_cm_id
*cm_id
,
2115 struct ib_cm_event
*event
,
2116 struct srp_target_port
*target
)
2118 struct Scsi_Host
*shost
= target
->scsi_host
;
2119 struct ib_class_port_info
*cpi
;
2122 switch (event
->param
.rej_rcvd
.reason
) {
2123 case IB_CM_REJ_PORT_CM_REDIRECT
:
2124 cpi
= event
->param
.rej_rcvd
.ari
;
2125 target
->path
.dlid
= cpi
->redirect_lid
;
2126 target
->path
.pkey
= cpi
->redirect_pkey
;
2127 cm_id
->remote_cm_qpn
= be32_to_cpu(cpi
->redirect_qp
) & 0x00ffffff;
2128 memcpy(target
->path
.dgid
.raw
, cpi
->redirect_gid
, 16);
2130 target
->status
= target
->path
.dlid
?
2131 SRP_DLID_REDIRECT
: SRP_PORT_REDIRECT
;
2134 case IB_CM_REJ_PORT_REDIRECT
:
2135 if (srp_target_is_topspin(target
)) {
2137 * Topspin/Cisco SRP gateways incorrectly send
2138 * reject reason code 25 when they mean 24
2141 memcpy(target
->path
.dgid
.raw
,
2142 event
->param
.rej_rcvd
.ari
, 16);
2144 shost_printk(KERN_DEBUG
, shost
,
2145 PFX
"Topspin/Cisco redirect to target port GID %016llx%016llx\n",
2146 (unsigned long long) be64_to_cpu(target
->path
.dgid
.global
.subnet_prefix
),
2147 (unsigned long long) be64_to_cpu(target
->path
.dgid
.global
.interface_id
));
2149 target
->status
= SRP_PORT_REDIRECT
;
2151 shost_printk(KERN_WARNING
, shost
,
2152 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
2153 target
->status
= -ECONNRESET
;
2157 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID
:
2158 shost_printk(KERN_WARNING
, shost
,
2159 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
2160 target
->status
= -ECONNRESET
;
2163 case IB_CM_REJ_CONSUMER_DEFINED
:
2164 opcode
= *(u8
*) event
->private_data
;
2165 if (opcode
== SRP_LOGIN_REJ
) {
2166 struct srp_login_rej
*rej
= event
->private_data
;
2167 u32 reason
= be32_to_cpu(rej
->reason
);
2169 if (reason
== SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE
)
2170 shost_printk(KERN_WARNING
, shost
,
2171 PFX
"SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
2173 shost_printk(KERN_WARNING
, shost
, PFX
2174 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
2175 target
->path
.sgid
.raw
,
2176 target
->orig_dgid
, reason
);
2178 shost_printk(KERN_WARNING
, shost
,
2179 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
2180 " opcode 0x%02x\n", opcode
);
2181 target
->status
= -ECONNRESET
;
2184 case IB_CM_REJ_STALE_CONN
:
2185 shost_printk(KERN_WARNING
, shost
, " REJ reason: stale connection\n");
2186 target
->status
= SRP_STALE_CONN
;
2190 shost_printk(KERN_WARNING
, shost
, " REJ reason 0x%x\n",
2191 event
->param
.rej_rcvd
.reason
);
2192 target
->status
= -ECONNRESET
;
2196 static int srp_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
2198 struct srp_target_port
*target
= cm_id
->context
;
2201 switch (event
->event
) {
2202 case IB_CM_REQ_ERROR
:
2203 shost_printk(KERN_DEBUG
, target
->scsi_host
,
2204 PFX
"Sending CM REQ failed\n");
2206 target
->status
= -ECONNRESET
;
2209 case IB_CM_REP_RECEIVED
:
2211 srp_cm_rep_handler(cm_id
, event
->private_data
, target
);
2214 case IB_CM_REJ_RECEIVED
:
2215 shost_printk(KERN_DEBUG
, target
->scsi_host
, PFX
"REJ received\n");
2218 srp_cm_rej_handler(cm_id
, event
, target
);
2221 case IB_CM_DREQ_RECEIVED
:
2222 shost_printk(KERN_WARNING
, target
->scsi_host
,
2223 PFX
"DREQ received - connection closed\n");
2224 srp_change_conn_state(target
, false);
2225 if (ib_send_cm_drep(cm_id
, NULL
, 0))
2226 shost_printk(KERN_ERR
, target
->scsi_host
,
2227 PFX
"Sending CM DREP failed\n");
2228 queue_work(system_long_wq
, &target
->tl_err_work
);
2231 case IB_CM_TIMEWAIT_EXIT
:
2232 shost_printk(KERN_ERR
, target
->scsi_host
,
2233 PFX
"connection closed\n");
2239 case IB_CM_MRA_RECEIVED
:
2240 case IB_CM_DREQ_ERROR
:
2241 case IB_CM_DREP_RECEIVED
:
2245 shost_printk(KERN_WARNING
, target
->scsi_host
,
2246 PFX
"Unhandled CM event %d\n", event
->event
);
2251 complete(&target
->done
);
2257 * srp_change_queue_type - changing device queue tag type
2258 * @sdev: scsi device struct
2259 * @tag_type: requested tag type
2261 * Returns queue tag type.
2264 srp_change_queue_type(struct scsi_device
*sdev
, int tag_type
)
2266 if (sdev
->tagged_supported
) {
2267 scsi_set_tag_type(sdev
, tag_type
);
2269 scsi_activate_tcq(sdev
, sdev
->queue_depth
);
2271 scsi_deactivate_tcq(sdev
, sdev
->queue_depth
);
2279 * srp_change_queue_depth - setting device queue depth
2280 * @sdev: scsi device struct
2281 * @qdepth: requested queue depth
2282 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
2283 * (see include/scsi/scsi_host.h for definition)
2285 * Returns queue depth.
2288 srp_change_queue_depth(struct scsi_device
*sdev
, int qdepth
, int reason
)
2290 struct Scsi_Host
*shost
= sdev
->host
;
2292 if (reason
== SCSI_QDEPTH_DEFAULT
|| reason
== SCSI_QDEPTH_RAMP_UP
) {
2293 max_depth
= shost
->can_queue
;
2294 if (!sdev
->tagged_supported
)
2296 if (qdepth
> max_depth
)
2298 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), qdepth
);
2299 } else if (reason
== SCSI_QDEPTH_QFULL
)
2300 scsi_track_queue_full(sdev
, qdepth
);
2304 return sdev
->queue_depth
;
2307 static int srp_send_tsk_mgmt(struct srp_target_port
*target
,
2308 u64 req_tag
, unsigned int lun
, u8 func
)
2310 struct srp_rport
*rport
= target
->rport
;
2311 struct ib_device
*dev
= target
->srp_host
->srp_dev
->dev
;
2313 struct srp_tsk_mgmt
*tsk_mgmt
;
2315 if (!target
->connected
|| target
->qp_in_error
)
2318 init_completion(&target
->tsk_mgmt_done
);
2321 * Lock the rport mutex to avoid that srp_create_target_ib() is
2322 * invoked while a task management function is being sent.
2324 mutex_lock(&rport
->mutex
);
2325 spin_lock_irq(&target
->lock
);
2326 iu
= __srp_get_tx_iu(target
, SRP_IU_TSK_MGMT
);
2327 spin_unlock_irq(&target
->lock
);
2330 mutex_unlock(&rport
->mutex
);
2335 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, sizeof *tsk_mgmt
,
2338 memset(tsk_mgmt
, 0, sizeof *tsk_mgmt
);
2340 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
2341 tsk_mgmt
->lun
= cpu_to_be64((u64
) lun
<< 48);
2342 tsk_mgmt
->tag
= req_tag
| SRP_TAG_TSK_MGMT
;
2343 tsk_mgmt
->tsk_mgmt_func
= func
;
2344 tsk_mgmt
->task_tag
= req_tag
;
2346 ib_dma_sync_single_for_device(dev
, iu
->dma
, sizeof *tsk_mgmt
,
2348 if (srp_post_send(target
, iu
, sizeof *tsk_mgmt
)) {
2349 srp_put_tx_iu(target
, iu
, SRP_IU_TSK_MGMT
);
2350 mutex_unlock(&rport
->mutex
);
2354 mutex_unlock(&rport
->mutex
);
2356 if (!wait_for_completion_timeout(&target
->tsk_mgmt_done
,
2357 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS
)))
2363 static int srp_abort(struct scsi_cmnd
*scmnd
)
2365 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
2366 struct srp_request
*req
= (struct srp_request
*) scmnd
->host_scribble
;
2369 shost_printk(KERN_ERR
, target
->scsi_host
, "SRP abort called\n");
2371 if (!req
|| !srp_claim_req(target
, req
, NULL
, scmnd
))
2373 if (srp_send_tsk_mgmt(target
, req
->index
, scmnd
->device
->lun
,
2374 SRP_TSK_ABORT_TASK
) == 0)
2376 else if (target
->rport
->state
== SRP_RPORT_LOST
)
2380 srp_free_req(target
, req
, scmnd
, 0);
2381 scmnd
->result
= DID_ABORT
<< 16;
2382 scmnd
->scsi_done(scmnd
);
2387 static int srp_reset_device(struct scsi_cmnd
*scmnd
)
2389 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
2392 shost_printk(KERN_ERR
, target
->scsi_host
, "SRP reset_device called\n");
2394 if (srp_send_tsk_mgmt(target
, SRP_TAG_NO_REQ
, scmnd
->device
->lun
,
2397 if (target
->tsk_mgmt_status
)
2400 for (i
= 0; i
< target
->req_ring_size
; ++i
) {
2401 struct srp_request
*req
= &target
->req_ring
[i
];
2402 srp_finish_req(target
, req
, scmnd
->device
, DID_RESET
<< 16);
2408 static int srp_reset_host(struct scsi_cmnd
*scmnd
)
2410 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
2412 shost_printk(KERN_ERR
, target
->scsi_host
, PFX
"SRP reset_host called\n");
2414 return srp_reconnect_rport(target
->rport
) == 0 ? SUCCESS
: FAILED
;
2417 static int srp_slave_configure(struct scsi_device
*sdev
)
2419 struct Scsi_Host
*shost
= sdev
->host
;
2420 struct srp_target_port
*target
= host_to_target(shost
);
2421 struct request_queue
*q
= sdev
->request_queue
;
2422 unsigned long timeout
;
2424 if (sdev
->type
== TYPE_DISK
) {
2425 timeout
= max_t(unsigned, 30 * HZ
, target
->rq_tmo_jiffies
);
2426 blk_queue_rq_timeout(q
, timeout
);
2432 static ssize_t
show_id_ext(struct device
*dev
, struct device_attribute
*attr
,
2435 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2437 return sprintf(buf
, "0x%016llx\n",
2438 (unsigned long long) be64_to_cpu(target
->id_ext
));
2441 static ssize_t
show_ioc_guid(struct device
*dev
, struct device_attribute
*attr
,
2444 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2446 return sprintf(buf
, "0x%016llx\n",
2447 (unsigned long long) be64_to_cpu(target
->ioc_guid
));
2450 static ssize_t
show_service_id(struct device
*dev
,
2451 struct device_attribute
*attr
, char *buf
)
2453 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2455 return sprintf(buf
, "0x%016llx\n",
2456 (unsigned long long) be64_to_cpu(target
->service_id
));
2459 static ssize_t
show_pkey(struct device
*dev
, struct device_attribute
*attr
,
2462 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2464 return sprintf(buf
, "0x%04x\n", be16_to_cpu(target
->path
.pkey
));
2467 static ssize_t
show_sgid(struct device
*dev
, struct device_attribute
*attr
,
2470 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2472 return sprintf(buf
, "%pI6\n", target
->path
.sgid
.raw
);
2475 static ssize_t
show_dgid(struct device
*dev
, struct device_attribute
*attr
,
2478 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2480 return sprintf(buf
, "%pI6\n", target
->path
.dgid
.raw
);
2483 static ssize_t
show_orig_dgid(struct device
*dev
,
2484 struct device_attribute
*attr
, char *buf
)
2486 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2488 return sprintf(buf
, "%pI6\n", target
->orig_dgid
);
2491 static ssize_t
show_req_lim(struct device
*dev
,
2492 struct device_attribute
*attr
, char *buf
)
2494 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2496 return sprintf(buf
, "%d\n", target
->req_lim
);
2499 static ssize_t
show_zero_req_lim(struct device
*dev
,
2500 struct device_attribute
*attr
, char *buf
)
2502 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2504 return sprintf(buf
, "%d\n", target
->zero_req_lim
);
2507 static ssize_t
show_local_ib_port(struct device
*dev
,
2508 struct device_attribute
*attr
, char *buf
)
2510 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2512 return sprintf(buf
, "%d\n", target
->srp_host
->port
);
2515 static ssize_t
show_local_ib_device(struct device
*dev
,
2516 struct device_attribute
*attr
, char *buf
)
2518 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2520 return sprintf(buf
, "%s\n", target
->srp_host
->srp_dev
->dev
->name
);
2523 static ssize_t
show_comp_vector(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
, "%d\n", target
->comp_vector
);
2531 static ssize_t
show_tl_retry_count(struct device
*dev
,
2532 struct device_attribute
*attr
, char *buf
)
2534 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2536 return sprintf(buf
, "%d\n", target
->tl_retry_count
);
2539 static ssize_t
show_cmd_sg_entries(struct device
*dev
,
2540 struct device_attribute
*attr
, char *buf
)
2542 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2544 return sprintf(buf
, "%u\n", target
->cmd_sg_cnt
);
2547 static ssize_t
show_allow_ext_sg(struct device
*dev
,
2548 struct device_attribute
*attr
, char *buf
)
2550 struct srp_target_port
*target
= host_to_target(class_to_shost(dev
));
2552 return sprintf(buf
, "%s\n", target
->allow_ext_sg
? "true" : "false");
2555 static DEVICE_ATTR(id_ext
, S_IRUGO
, show_id_ext
, NULL
);
2556 static DEVICE_ATTR(ioc_guid
, S_IRUGO
, show_ioc_guid
, NULL
);
2557 static DEVICE_ATTR(service_id
, S_IRUGO
, show_service_id
, NULL
);
2558 static DEVICE_ATTR(pkey
, S_IRUGO
, show_pkey
, NULL
);
2559 static DEVICE_ATTR(sgid
, S_IRUGO
, show_sgid
, NULL
);
2560 static DEVICE_ATTR(dgid
, S_IRUGO
, show_dgid
, NULL
);
2561 static DEVICE_ATTR(orig_dgid
, S_IRUGO
, show_orig_dgid
, NULL
);
2562 static DEVICE_ATTR(req_lim
, S_IRUGO
, show_req_lim
, NULL
);
2563 static DEVICE_ATTR(zero_req_lim
, S_IRUGO
, show_zero_req_lim
, NULL
);
2564 static DEVICE_ATTR(local_ib_port
, S_IRUGO
, show_local_ib_port
, NULL
);
2565 static DEVICE_ATTR(local_ib_device
, S_IRUGO
, show_local_ib_device
, NULL
);
2566 static DEVICE_ATTR(comp_vector
, S_IRUGO
, show_comp_vector
, NULL
);
2567 static DEVICE_ATTR(tl_retry_count
, S_IRUGO
, show_tl_retry_count
, NULL
);
2568 static DEVICE_ATTR(cmd_sg_entries
, S_IRUGO
, show_cmd_sg_entries
, NULL
);
2569 static DEVICE_ATTR(allow_ext_sg
, S_IRUGO
, show_allow_ext_sg
, NULL
);
2571 static struct device_attribute
*srp_host_attrs
[] = {
2574 &dev_attr_service_id
,
2578 &dev_attr_orig_dgid
,
2580 &dev_attr_zero_req_lim
,
2581 &dev_attr_local_ib_port
,
2582 &dev_attr_local_ib_device
,
2583 &dev_attr_comp_vector
,
2584 &dev_attr_tl_retry_count
,
2585 &dev_attr_cmd_sg_entries
,
2586 &dev_attr_allow_ext_sg
,
2590 static struct scsi_host_template srp_template
= {
2591 .module
= THIS_MODULE
,
2592 .name
= "InfiniBand SRP initiator",
2593 .proc_name
= DRV_NAME
,
2594 .slave_configure
= srp_slave_configure
,
2595 .info
= srp_target_info
,
2596 .queuecommand
= srp_queuecommand
,
2597 .change_queue_depth
= srp_change_queue_depth
,
2598 .change_queue_type
= srp_change_queue_type
,
2599 .eh_abort_handler
= srp_abort
,
2600 .eh_device_reset_handler
= srp_reset_device
,
2601 .eh_host_reset_handler
= srp_reset_host
,
2602 .skip_settle_delay
= true,
2603 .sg_tablesize
= SRP_DEF_SG_TABLESIZE
,
2604 .can_queue
= SRP_DEFAULT_CMD_SQ_SIZE
,
2606 .cmd_per_lun
= SRP_DEFAULT_CMD_SQ_SIZE
,
2607 .use_clustering
= ENABLE_CLUSTERING
,
2608 .shost_attrs
= srp_host_attrs
2611 static int srp_add_target(struct srp_host
*host
, struct srp_target_port
*target
)
2613 struct srp_rport_identifiers ids
;
2614 struct srp_rport
*rport
;
2616 sprintf(target
->target_name
, "SRP.T10:%016llX",
2617 (unsigned long long) be64_to_cpu(target
->id_ext
));
2619 if (scsi_add_host(target
->scsi_host
, host
->srp_dev
->dev
->dma_device
))
2622 memcpy(ids
.port_id
, &target
->id_ext
, 8);
2623 memcpy(ids
.port_id
+ 8, &target
->ioc_guid
, 8);
2624 ids
.roles
= SRP_RPORT_ROLE_TARGET
;
2625 rport
= srp_rport_add(target
->scsi_host
, &ids
);
2626 if (IS_ERR(rport
)) {
2627 scsi_remove_host(target
->scsi_host
);
2628 return PTR_ERR(rport
);
2631 rport
->lld_data
= target
;
2632 target
->rport
= rport
;
2634 spin_lock(&host
->target_lock
);
2635 list_add_tail(&target
->list
, &host
->target_list
);
2636 spin_unlock(&host
->target_lock
);
2638 target
->state
= SRP_TARGET_LIVE
;
2640 scsi_scan_target(&target
->scsi_host
->shost_gendev
,
2641 0, target
->scsi_id
, SCAN_WILD_CARD
, 0);
2646 static void srp_release_dev(struct device
*dev
)
2648 struct srp_host
*host
=
2649 container_of(dev
, struct srp_host
, dev
);
2651 complete(&host
->released
);
2654 static struct class srp_class
= {
2655 .name
= "infiniband_srp",
2656 .dev_release
= srp_release_dev
2660 * srp_conn_unique() - check whether the connection to a target is unique
2662 * @target: SRP target port.
2664 static bool srp_conn_unique(struct srp_host
*host
,
2665 struct srp_target_port
*target
)
2667 struct srp_target_port
*t
;
2670 if (target
->state
== SRP_TARGET_REMOVED
)
2675 spin_lock(&host
->target_lock
);
2676 list_for_each_entry(t
, &host
->target_list
, list
) {
2678 target
->id_ext
== t
->id_ext
&&
2679 target
->ioc_guid
== t
->ioc_guid
&&
2680 target
->initiator_ext
== t
->initiator_ext
) {
2685 spin_unlock(&host
->target_lock
);
2692 * Target ports are added by writing
2694 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2695 * pkey=<P_Key>,service_id=<service ID>
2697 * to the add_target sysfs attribute.
2701 SRP_OPT_ID_EXT
= 1 << 0,
2702 SRP_OPT_IOC_GUID
= 1 << 1,
2703 SRP_OPT_DGID
= 1 << 2,
2704 SRP_OPT_PKEY
= 1 << 3,
2705 SRP_OPT_SERVICE_ID
= 1 << 4,
2706 SRP_OPT_MAX_SECT
= 1 << 5,
2707 SRP_OPT_MAX_CMD_PER_LUN
= 1 << 6,
2708 SRP_OPT_IO_CLASS
= 1 << 7,
2709 SRP_OPT_INITIATOR_EXT
= 1 << 8,
2710 SRP_OPT_CMD_SG_ENTRIES
= 1 << 9,
2711 SRP_OPT_ALLOW_EXT_SG
= 1 << 10,
2712 SRP_OPT_SG_TABLESIZE
= 1 << 11,
2713 SRP_OPT_COMP_VECTOR
= 1 << 12,
2714 SRP_OPT_TL_RETRY_COUNT
= 1 << 13,
2715 SRP_OPT_QUEUE_SIZE
= 1 << 14,
2716 SRP_OPT_ALL
= (SRP_OPT_ID_EXT
|
2720 SRP_OPT_SERVICE_ID
),
2723 static const match_table_t srp_opt_tokens
= {
2724 { SRP_OPT_ID_EXT
, "id_ext=%s" },
2725 { SRP_OPT_IOC_GUID
, "ioc_guid=%s" },
2726 { SRP_OPT_DGID
, "dgid=%s" },
2727 { SRP_OPT_PKEY
, "pkey=%x" },
2728 { SRP_OPT_SERVICE_ID
, "service_id=%s" },
2729 { SRP_OPT_MAX_SECT
, "max_sect=%d" },
2730 { SRP_OPT_MAX_CMD_PER_LUN
, "max_cmd_per_lun=%d" },
2731 { SRP_OPT_IO_CLASS
, "io_class=%x" },
2732 { SRP_OPT_INITIATOR_EXT
, "initiator_ext=%s" },
2733 { SRP_OPT_CMD_SG_ENTRIES
, "cmd_sg_entries=%u" },
2734 { SRP_OPT_ALLOW_EXT_SG
, "allow_ext_sg=%u" },
2735 { SRP_OPT_SG_TABLESIZE
, "sg_tablesize=%u" },
2736 { SRP_OPT_COMP_VECTOR
, "comp_vector=%u" },
2737 { SRP_OPT_TL_RETRY_COUNT
, "tl_retry_count=%u" },
2738 { SRP_OPT_QUEUE_SIZE
, "queue_size=%d" },
2739 { SRP_OPT_ERR
, NULL
}
2742 static int srp_parse_options(const char *buf
, struct srp_target_port
*target
)
2744 char *options
, *sep_opt
;
2747 substring_t args
[MAX_OPT_ARGS
];
2753 options
= kstrdup(buf
, GFP_KERNEL
);
2758 while ((p
= strsep(&sep_opt
, ",")) != NULL
) {
2762 token
= match_token(p
, srp_opt_tokens
, args
);
2766 case SRP_OPT_ID_EXT
:
2767 p
= match_strdup(args
);
2772 target
->id_ext
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
2776 case SRP_OPT_IOC_GUID
:
2777 p
= match_strdup(args
);
2782 target
->ioc_guid
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
2787 p
= match_strdup(args
);
2792 if (strlen(p
) != 32) {
2793 pr_warn("bad dest GID parameter '%s'\n", p
);
2798 for (i
= 0; i
< 16; ++i
) {
2799 strlcpy(dgid
, p
+ i
* 2, 3);
2800 target
->path
.dgid
.raw
[i
] = simple_strtoul(dgid
, NULL
, 16);
2803 memcpy(target
->orig_dgid
, target
->path
.dgid
.raw
, 16);
2807 if (match_hex(args
, &token
)) {
2808 pr_warn("bad P_Key parameter '%s'\n", p
);
2811 target
->path
.pkey
= cpu_to_be16(token
);
2814 case SRP_OPT_SERVICE_ID
:
2815 p
= match_strdup(args
);
2820 target
->service_id
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
2821 target
->path
.service_id
= target
->service_id
;
2825 case SRP_OPT_MAX_SECT
:
2826 if (match_int(args
, &token
)) {
2827 pr_warn("bad max sect parameter '%s'\n", p
);
2830 target
->scsi_host
->max_sectors
= token
;
2833 case SRP_OPT_QUEUE_SIZE
:
2834 if (match_int(args
, &token
) || token
< 1) {
2835 pr_warn("bad queue_size parameter '%s'\n", p
);
2838 target
->scsi_host
->can_queue
= token
;
2839 target
->queue_size
= token
+ SRP_RSP_SQ_SIZE
+
2840 SRP_TSK_MGMT_SQ_SIZE
;
2841 if (!(opt_mask
& SRP_OPT_MAX_CMD_PER_LUN
))
2842 target
->scsi_host
->cmd_per_lun
= token
;
2845 case SRP_OPT_MAX_CMD_PER_LUN
:
2846 if (match_int(args
, &token
) || token
< 1) {
2847 pr_warn("bad max cmd_per_lun parameter '%s'\n",
2851 target
->scsi_host
->cmd_per_lun
= token
;
2854 case SRP_OPT_IO_CLASS
:
2855 if (match_hex(args
, &token
)) {
2856 pr_warn("bad IO class parameter '%s'\n", p
);
2859 if (token
!= SRP_REV10_IB_IO_CLASS
&&
2860 token
!= SRP_REV16A_IB_IO_CLASS
) {
2861 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
2862 token
, SRP_REV10_IB_IO_CLASS
,
2863 SRP_REV16A_IB_IO_CLASS
);
2866 target
->io_class
= token
;
2869 case SRP_OPT_INITIATOR_EXT
:
2870 p
= match_strdup(args
);
2875 target
->initiator_ext
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
2879 case SRP_OPT_CMD_SG_ENTRIES
:
2880 if (match_int(args
, &token
) || token
< 1 || token
> 255) {
2881 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
2885 target
->cmd_sg_cnt
= token
;
2888 case SRP_OPT_ALLOW_EXT_SG
:
2889 if (match_int(args
, &token
)) {
2890 pr_warn("bad allow_ext_sg parameter '%s'\n", p
);
2893 target
->allow_ext_sg
= !!token
;
2896 case SRP_OPT_SG_TABLESIZE
:
2897 if (match_int(args
, &token
) || token
< 1 ||
2898 token
> SCSI_MAX_SG_CHAIN_SEGMENTS
) {
2899 pr_warn("bad max sg_tablesize parameter '%s'\n",
2903 target
->sg_tablesize
= token
;
2906 case SRP_OPT_COMP_VECTOR
:
2907 if (match_int(args
, &token
) || token
< 0) {
2908 pr_warn("bad comp_vector parameter '%s'\n", p
);
2911 target
->comp_vector
= token
;
2914 case SRP_OPT_TL_RETRY_COUNT
:
2915 if (match_int(args
, &token
) || token
< 2 || token
> 7) {
2916 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
2920 target
->tl_retry_count
= token
;
2924 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
2930 if ((opt_mask
& SRP_OPT_ALL
) == SRP_OPT_ALL
)
2933 for (i
= 0; i
< ARRAY_SIZE(srp_opt_tokens
); ++i
)
2934 if ((srp_opt_tokens
[i
].token
& SRP_OPT_ALL
) &&
2935 !(srp_opt_tokens
[i
].token
& opt_mask
))
2936 pr_warn("target creation request is missing parameter '%s'\n",
2937 srp_opt_tokens
[i
].pattern
);
2939 if (target
->scsi_host
->cmd_per_lun
> target
->scsi_host
->can_queue
2940 && (opt_mask
& SRP_OPT_MAX_CMD_PER_LUN
))
2941 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
2942 target
->scsi_host
->cmd_per_lun
,
2943 target
->scsi_host
->can_queue
);
2950 static ssize_t
srp_create_target(struct device
*dev
,
2951 struct device_attribute
*attr
,
2952 const char *buf
, size_t count
)
2954 struct srp_host
*host
=
2955 container_of(dev
, struct srp_host
, dev
);
2956 struct Scsi_Host
*target_host
;
2957 struct srp_target_port
*target
;
2958 struct srp_device
*srp_dev
= host
->srp_dev
;
2959 struct ib_device
*ibdev
= srp_dev
->dev
;
2962 target_host
= scsi_host_alloc(&srp_template
,
2963 sizeof (struct srp_target_port
));
2967 target_host
->transportt
= ib_srp_transport_template
;
2968 target_host
->max_channel
= 0;
2969 target_host
->max_id
= 1;
2970 target_host
->max_lun
= SRP_MAX_LUN
;
2971 target_host
->max_cmd_len
= sizeof ((struct srp_cmd
*) (void *) 0L)->cdb
;
2973 target
= host_to_target(target_host
);
2975 target
->io_class
= SRP_REV16A_IB_IO_CLASS
;
2976 target
->scsi_host
= target_host
;
2977 target
->srp_host
= host
;
2978 target
->lkey
= host
->srp_dev
->mr
->lkey
;
2979 target
->rkey
= host
->srp_dev
->mr
->rkey
;
2980 target
->cmd_sg_cnt
= cmd_sg_entries
;
2981 target
->sg_tablesize
= indirect_sg_entries
? : cmd_sg_entries
;
2982 target
->allow_ext_sg
= allow_ext_sg
;
2983 target
->tl_retry_count
= 7;
2984 target
->queue_size
= SRP_DEFAULT_QUEUE_SIZE
;
2986 mutex_lock(&host
->add_target_mutex
);
2988 ret
= srp_parse_options(buf
, target
);
2992 target
->req_ring_size
= target
->queue_size
- SRP_TSK_MGMT_SQ_SIZE
;
2994 if (!srp_conn_unique(target
->srp_host
, target
)) {
2995 shost_printk(KERN_INFO
, target
->scsi_host
,
2996 PFX
"Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
2997 be64_to_cpu(target
->id_ext
),
2998 be64_to_cpu(target
->ioc_guid
),
2999 be64_to_cpu(target
->initiator_ext
));
3004 if (!srp_dev
->has_fmr
&& !srp_dev
->has_fr
&& !target
->allow_ext_sg
&&
3005 target
->cmd_sg_cnt
< target
->sg_tablesize
) {
3006 pr_warn("No MR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
3007 target
->sg_tablesize
= target
->cmd_sg_cnt
;
3010 target_host
->sg_tablesize
= target
->sg_tablesize
;
3011 target
->indirect_size
= target
->sg_tablesize
*
3012 sizeof (struct srp_direct_buf
);
3013 target
->max_iu_len
= sizeof (struct srp_cmd
) +
3014 sizeof (struct srp_indirect_buf
) +
3015 target
->cmd_sg_cnt
* sizeof (struct srp_direct_buf
);
3017 INIT_WORK(&target
->tl_err_work
, srp_tl_err_work
);
3018 INIT_WORK(&target
->remove_work
, srp_remove_work
);
3019 spin_lock_init(&target
->lock
);
3020 INIT_LIST_HEAD(&target
->free_tx
);
3021 ret
= srp_alloc_req_data(target
);
3025 ret
= ib_query_gid(ibdev
, host
->port
, 0, &target
->path
.sgid
);
3029 ret
= srp_create_target_ib(target
);
3033 ret
= srp_new_cm_id(target
);
3037 ret
= srp_connect_target(target
);
3039 shost_printk(KERN_ERR
, target
->scsi_host
,
3040 PFX
"Connection failed\n");
3044 ret
= srp_add_target(host
, target
);
3046 goto err_disconnect
;
3048 shost_printk(KERN_DEBUG
, target
->scsi_host
, PFX
3049 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
3050 be64_to_cpu(target
->id_ext
),
3051 be64_to_cpu(target
->ioc_guid
),
3052 be16_to_cpu(target
->path
.pkey
),
3053 be64_to_cpu(target
->service_id
),
3054 target
->path
.sgid
.raw
, target
->path
.dgid
.raw
);
3059 mutex_unlock(&host
->add_target_mutex
);
3063 srp_disconnect_target(target
);
3066 ib_destroy_cm_id(target
->cm_id
);
3069 srp_free_target_ib(target
);
3072 srp_free_req_data(target
);
3075 scsi_host_put(target_host
);
3079 static DEVICE_ATTR(add_target
, S_IWUSR
, NULL
, srp_create_target
);
3081 static ssize_t
show_ibdev(struct device
*dev
, struct device_attribute
*attr
,
3084 struct srp_host
*host
= container_of(dev
, struct srp_host
, dev
);
3086 return sprintf(buf
, "%s\n", host
->srp_dev
->dev
->name
);
3089 static DEVICE_ATTR(ibdev
, S_IRUGO
, show_ibdev
, NULL
);
3091 static ssize_t
show_port(struct device
*dev
, struct device_attribute
*attr
,
3094 struct srp_host
*host
= container_of(dev
, struct srp_host
, dev
);
3096 return sprintf(buf
, "%d\n", host
->port
);
3099 static DEVICE_ATTR(port
, S_IRUGO
, show_port
, NULL
);
3101 static struct srp_host
*srp_add_port(struct srp_device
*device
, u8 port
)
3103 struct srp_host
*host
;
3105 host
= kzalloc(sizeof *host
, GFP_KERNEL
);
3109 INIT_LIST_HEAD(&host
->target_list
);
3110 spin_lock_init(&host
->target_lock
);
3111 init_completion(&host
->released
);
3112 mutex_init(&host
->add_target_mutex
);
3113 host
->srp_dev
= device
;
3116 host
->dev
.class = &srp_class
;
3117 host
->dev
.parent
= device
->dev
->dma_device
;
3118 dev_set_name(&host
->dev
, "srp-%s-%d", device
->dev
->name
, port
);
3120 if (device_register(&host
->dev
))
3122 if (device_create_file(&host
->dev
, &dev_attr_add_target
))
3124 if (device_create_file(&host
->dev
, &dev_attr_ibdev
))
3126 if (device_create_file(&host
->dev
, &dev_attr_port
))
3132 device_unregister(&host
->dev
);
3140 static void srp_add_one(struct ib_device
*device
)
3142 struct srp_device
*srp_dev
;
3143 struct ib_device_attr
*dev_attr
;
3144 struct srp_host
*host
;
3145 int mr_page_shift
, s
, e
, p
;
3146 u64 max_pages_per_mr
;
3148 dev_attr
= kmalloc(sizeof *dev_attr
, GFP_KERNEL
);
3152 if (ib_query_device(device
, dev_attr
)) {
3153 pr_warn("Query device failed for %s\n", device
->name
);
3157 srp_dev
= kmalloc(sizeof *srp_dev
, GFP_KERNEL
);
3161 srp_dev
->has_fmr
= (device
->alloc_fmr
&& device
->dealloc_fmr
&&
3162 device
->map_phys_fmr
&& device
->unmap_fmr
);
3163 srp_dev
->has_fr
= (dev_attr
->device_cap_flags
&
3164 IB_DEVICE_MEM_MGT_EXTENSIONS
);
3165 if (!srp_dev
->has_fmr
&& !srp_dev
->has_fr
)
3166 dev_warn(&device
->dev
, "neither FMR nor FR is supported\n");
3168 srp_dev
->use_fast_reg
= (srp_dev
->has_fr
&&
3169 (!srp_dev
->has_fmr
|| prefer_fr
));
3172 * Use the smallest page size supported by the HCA, down to a
3173 * minimum of 4096 bytes. We're unlikely to build large sglists
3174 * out of smaller entries.
3176 mr_page_shift
= max(12, ffs(dev_attr
->page_size_cap
) - 1);
3177 srp_dev
->mr_page_size
= 1 << mr_page_shift
;
3178 srp_dev
->mr_page_mask
= ~((u64
) srp_dev
->mr_page_size
- 1);
3179 max_pages_per_mr
= dev_attr
->max_mr_size
;
3180 do_div(max_pages_per_mr
, srp_dev
->mr_page_size
);
3181 srp_dev
->max_pages_per_mr
= min_t(u64
, SRP_MAX_PAGES_PER_MR
,
3183 if (srp_dev
->use_fast_reg
) {
3184 srp_dev
->max_pages_per_mr
=
3185 min_t(u32
, srp_dev
->max_pages_per_mr
,
3186 dev_attr
->max_fast_reg_page_list_len
);
3188 srp_dev
->mr_max_size
= srp_dev
->mr_page_size
*
3189 srp_dev
->max_pages_per_mr
;
3190 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",
3191 device
->name
, mr_page_shift
, dev_attr
->max_mr_size
,
3192 dev_attr
->max_fast_reg_page_list_len
,
3193 srp_dev
->max_pages_per_mr
, srp_dev
->mr_max_size
);
3195 INIT_LIST_HEAD(&srp_dev
->dev_list
);
3197 srp_dev
->dev
= device
;
3198 srp_dev
->pd
= ib_alloc_pd(device
);
3199 if (IS_ERR(srp_dev
->pd
))
3202 srp_dev
->mr
= ib_get_dma_mr(srp_dev
->pd
,
3203 IB_ACCESS_LOCAL_WRITE
|
3204 IB_ACCESS_REMOTE_READ
|
3205 IB_ACCESS_REMOTE_WRITE
);
3206 if (IS_ERR(srp_dev
->mr
))
3209 if (device
->node_type
== RDMA_NODE_IB_SWITCH
) {
3214 e
= device
->phys_port_cnt
;
3217 for (p
= s
; p
<= e
; ++p
) {
3218 host
= srp_add_port(srp_dev
, p
);
3220 list_add_tail(&host
->list
, &srp_dev
->dev_list
);
3223 ib_set_client_data(device
, &srp_client
, srp_dev
);
3228 ib_dealloc_pd(srp_dev
->pd
);
3237 static void srp_remove_one(struct ib_device
*device
)
3239 struct srp_device
*srp_dev
;
3240 struct srp_host
*host
, *tmp_host
;
3241 struct srp_target_port
*target
;
3243 srp_dev
= ib_get_client_data(device
, &srp_client
);
3247 list_for_each_entry_safe(host
, tmp_host
, &srp_dev
->dev_list
, list
) {
3248 device_unregister(&host
->dev
);
3250 * Wait for the sysfs entry to go away, so that no new
3251 * target ports can be created.
3253 wait_for_completion(&host
->released
);
3256 * Remove all target ports.
3258 spin_lock(&host
->target_lock
);
3259 list_for_each_entry(target
, &host
->target_list
, list
)
3260 srp_queue_remove_work(target
);
3261 spin_unlock(&host
->target_lock
);
3264 * Wait for target port removal tasks.
3266 flush_workqueue(system_long_wq
);
3271 ib_dereg_mr(srp_dev
->mr
);
3272 ib_dealloc_pd(srp_dev
->pd
);
3277 static struct srp_function_template ib_srp_transport_functions
= {
3278 .has_rport_state
= true,
3279 .reset_timer_if_blocked
= true,
3280 .reconnect_delay
= &srp_reconnect_delay
,
3281 .fast_io_fail_tmo
= &srp_fast_io_fail_tmo
,
3282 .dev_loss_tmo
= &srp_dev_loss_tmo
,
3283 .reconnect
= srp_rport_reconnect
,
3284 .rport_delete
= srp_rport_delete
,
3285 .terminate_rport_io
= srp_terminate_io
,
3288 static int __init
srp_init_module(void)
3292 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc
, wr_id
) < sizeof(void *));
3294 if (srp_sg_tablesize
) {
3295 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
3296 if (!cmd_sg_entries
)
3297 cmd_sg_entries
= srp_sg_tablesize
;
3300 if (!cmd_sg_entries
)
3301 cmd_sg_entries
= SRP_DEF_SG_TABLESIZE
;
3303 if (cmd_sg_entries
> 255) {
3304 pr_warn("Clamping cmd_sg_entries to 255\n");
3305 cmd_sg_entries
= 255;
3308 if (!indirect_sg_entries
)
3309 indirect_sg_entries
= cmd_sg_entries
;
3310 else if (indirect_sg_entries
< cmd_sg_entries
) {
3311 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
3313 indirect_sg_entries
= cmd_sg_entries
;
3316 ib_srp_transport_template
=
3317 srp_attach_transport(&ib_srp_transport_functions
);
3318 if (!ib_srp_transport_template
)
3321 ret
= class_register(&srp_class
);
3323 pr_err("couldn't register class infiniband_srp\n");
3324 srp_release_transport(ib_srp_transport_template
);
3328 ib_sa_register_client(&srp_sa_client
);
3330 ret
= ib_register_client(&srp_client
);
3332 pr_err("couldn't register IB client\n");
3333 srp_release_transport(ib_srp_transport_template
);
3334 ib_sa_unregister_client(&srp_sa_client
);
3335 class_unregister(&srp_class
);
3342 static void __exit
srp_cleanup_module(void)
3344 ib_unregister_client(&srp_client
);
3345 ib_sa_unregister_client(&srp_sa_client
);
3346 class_unregister(&srp_class
);
3347 srp_release_transport(ib_srp_transport_template
);
3350 module_init(srp_init_module
);
3351 module_exit(srp_cleanup_module
);