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
32 * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
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 <asm/atomic.h>
46 #include <scsi/scsi.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_dbg.h>
51 #include <rdma/ib_cache.h>
55 #define DRV_NAME "ib_srp"
56 #define PFX DRV_NAME ": "
57 #define DRV_VERSION "0.2"
58 #define DRV_RELDATE "November 1, 2005"
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 int topspin_workarounds
= 1;
67 module_param(topspin_workarounds
, int, 0444);
68 MODULE_PARM_DESC(topspin_workarounds
,
69 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
71 static const u8 topspin_oui
[3] = { 0x00, 0x05, 0xad };
73 static void srp_add_one(struct ib_device
*device
);
74 static void srp_remove_one(struct ib_device
*device
);
75 static void srp_completion(struct ib_cq
*cq
, void *target_ptr
);
76 static int srp_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
);
78 static struct ib_client srp_client
= {
81 .remove
= srp_remove_one
84 static inline struct srp_target_port
*host_to_target(struct Scsi_Host
*host
)
86 return (struct srp_target_port
*) host
->hostdata
;
89 static const char *srp_target_info(struct Scsi_Host
*host
)
91 return host_to_target(host
)->target_name
;
94 static struct srp_iu
*srp_alloc_iu(struct srp_host
*host
, size_t size
,
96 enum dma_data_direction direction
)
100 iu
= kmalloc(sizeof *iu
, gfp_mask
);
104 iu
->buf
= kzalloc(size
, gfp_mask
);
108 iu
->dma
= dma_map_single(host
->dev
->dma_device
, iu
->buf
, size
, direction
);
109 if (dma_mapping_error(iu
->dma
))
113 iu
->direction
= direction
;
125 static void srp_free_iu(struct srp_host
*host
, struct srp_iu
*iu
)
130 dma_unmap_single(host
->dev
->dma_device
, iu
->dma
, iu
->size
, iu
->direction
);
135 static void srp_qp_event(struct ib_event
*event
, void *context
)
137 printk(KERN_ERR PFX
"QP event %d\n", event
->event
);
140 static int srp_init_qp(struct srp_target_port
*target
,
143 struct ib_qp_attr
*attr
;
146 attr
= kmalloc(sizeof *attr
, GFP_KERNEL
);
150 ret
= ib_find_cached_pkey(target
->srp_host
->dev
,
151 target
->srp_host
->port
,
152 be16_to_cpu(target
->path
.pkey
),
157 attr
->qp_state
= IB_QPS_INIT
;
158 attr
->qp_access_flags
= (IB_ACCESS_REMOTE_READ
|
159 IB_ACCESS_REMOTE_WRITE
);
160 attr
->port_num
= target
->srp_host
->port
;
162 ret
= ib_modify_qp(qp
, attr
,
173 static int srp_create_target_ib(struct srp_target_port
*target
)
175 struct ib_qp_init_attr
*init_attr
;
178 init_attr
= kzalloc(sizeof *init_attr
, GFP_KERNEL
);
182 target
->cq
= ib_create_cq(target
->srp_host
->dev
, srp_completion
,
183 NULL
, target
, SRP_CQ_SIZE
);
184 if (IS_ERR(target
->cq
)) {
185 ret
= PTR_ERR(target
->cq
);
189 ib_req_notify_cq(target
->cq
, IB_CQ_NEXT_COMP
);
191 init_attr
->event_handler
= srp_qp_event
;
192 init_attr
->cap
.max_send_wr
= SRP_SQ_SIZE
;
193 init_attr
->cap
.max_recv_wr
= SRP_RQ_SIZE
;
194 init_attr
->cap
.max_recv_sge
= 1;
195 init_attr
->cap
.max_send_sge
= 1;
196 init_attr
->sq_sig_type
= IB_SIGNAL_ALL_WR
;
197 init_attr
->qp_type
= IB_QPT_RC
;
198 init_attr
->send_cq
= target
->cq
;
199 init_attr
->recv_cq
= target
->cq
;
201 target
->qp
= ib_create_qp(target
->srp_host
->pd
, init_attr
);
202 if (IS_ERR(target
->qp
)) {
203 ret
= PTR_ERR(target
->qp
);
204 ib_destroy_cq(target
->cq
);
208 ret
= srp_init_qp(target
, target
->qp
);
210 ib_destroy_qp(target
->qp
);
211 ib_destroy_cq(target
->cq
);
220 static void srp_free_target_ib(struct srp_target_port
*target
)
224 ib_destroy_qp(target
->qp
);
225 ib_destroy_cq(target
->cq
);
227 for (i
= 0; i
< SRP_RQ_SIZE
; ++i
)
228 srp_free_iu(target
->srp_host
, target
->rx_ring
[i
]);
229 for (i
= 0; i
< SRP_SQ_SIZE
+ 1; ++i
)
230 srp_free_iu(target
->srp_host
, target
->tx_ring
[i
]);
233 static void srp_path_rec_completion(int status
,
234 struct ib_sa_path_rec
*pathrec
,
237 struct srp_target_port
*target
= target_ptr
;
239 target
->status
= status
;
241 printk(KERN_ERR PFX
"Got failed path rec status %d\n", status
);
243 target
->path
= *pathrec
;
244 complete(&target
->done
);
247 static int srp_lookup_path(struct srp_target_port
*target
)
249 target
->path
.numb_path
= 1;
251 init_completion(&target
->done
);
253 target
->path_query_id
= ib_sa_path_rec_get(target
->srp_host
->dev
,
254 target
->srp_host
->port
,
256 IB_SA_PATH_REC_DGID
|
257 IB_SA_PATH_REC_SGID
|
258 IB_SA_PATH_REC_NUMB_PATH
|
260 SRP_PATH_REC_TIMEOUT_MS
,
262 srp_path_rec_completion
,
263 target
, &target
->path_query
);
264 if (target
->path_query_id
< 0)
265 return target
->path_query_id
;
267 wait_for_completion(&target
->done
);
269 if (target
->status
< 0)
270 printk(KERN_WARNING PFX
"Path record query failed\n");
272 return target
->status
;
275 static int srp_send_req(struct srp_target_port
*target
)
278 struct ib_cm_req_param param
;
279 struct srp_login_req priv
;
283 req
= kzalloc(sizeof *req
, GFP_KERNEL
);
287 req
->param
.primary_path
= &target
->path
;
288 req
->param
.alternate_path
= NULL
;
289 req
->param
.service_id
= target
->service_id
;
290 req
->param
.qp_num
= target
->qp
->qp_num
;
291 req
->param
.qp_type
= target
->qp
->qp_type
;
292 req
->param
.private_data
= &req
->priv
;
293 req
->param
.private_data_len
= sizeof req
->priv
;
294 req
->param
.flow_control
= 1;
296 get_random_bytes(&req
->param
.starting_psn
, 4);
297 req
->param
.starting_psn
&= 0xffffff;
300 * Pick some arbitrary defaults here; we could make these
301 * module parameters if anyone cared about setting them.
303 req
->param
.responder_resources
= 4;
304 req
->param
.remote_cm_response_timeout
= 20;
305 req
->param
.local_cm_response_timeout
= 20;
306 req
->param
.retry_count
= 7;
307 req
->param
.rnr_retry_count
= 7;
308 req
->param
.max_cm_retries
= 15;
310 req
->priv
.opcode
= SRP_LOGIN_REQ
;
312 req
->priv
.req_it_iu_len
= cpu_to_be32(SRP_MAX_IU_LEN
);
313 req
->priv
.req_buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
|
314 SRP_BUF_FORMAT_INDIRECT
);
315 memcpy(req
->priv
.initiator_port_id
, target
->srp_host
->initiator_port_id
, 16);
317 * Topspin/Cisco SRP targets will reject our login unless we
318 * zero out the first 8 bytes of our initiator port ID. The
319 * second 8 bytes must be our local node GUID, but we always
322 if (topspin_workarounds
&& !memcmp(&target
->ioc_guid
, topspin_oui
, 3)) {
323 printk(KERN_DEBUG PFX
"Topspin/Cisco initiator port ID workaround "
324 "activated for target GUID %016llx\n",
325 (unsigned long long) be64_to_cpu(target
->ioc_guid
));
326 memset(req
->priv
.initiator_port_id
, 0, 8);
328 memcpy(req
->priv
.target_port_id
, &target
->id_ext
, 8);
329 memcpy(req
->priv
.target_port_id
+ 8, &target
->ioc_guid
, 8);
331 status
= ib_send_cm_req(target
->cm_id
, &req
->param
);
338 static void srp_disconnect_target(struct srp_target_port
*target
)
340 /* XXX should send SRP_I_LOGOUT request */
342 init_completion(&target
->done
);
343 ib_send_cm_dreq(target
->cm_id
, NULL
, 0);
344 wait_for_completion(&target
->done
);
347 static void srp_remove_work(void *target_ptr
)
349 struct srp_target_port
*target
= target_ptr
;
351 spin_lock_irq(target
->scsi_host
->host_lock
);
352 if (target
->state
!= SRP_TARGET_DEAD
) {
353 spin_unlock_irq(target
->scsi_host
->host_lock
);
354 scsi_host_put(target
->scsi_host
);
357 target
->state
= SRP_TARGET_REMOVED
;
358 spin_unlock_irq(target
->scsi_host
->host_lock
);
360 mutex_lock(&target
->srp_host
->target_mutex
);
361 list_del(&target
->list
);
362 mutex_unlock(&target
->srp_host
->target_mutex
);
364 scsi_remove_host(target
->scsi_host
);
365 ib_destroy_cm_id(target
->cm_id
);
366 srp_free_target_ib(target
);
367 scsi_host_put(target
->scsi_host
);
368 /* And another put to really free the target port... */
369 scsi_host_put(target
->scsi_host
);
372 static int srp_connect_target(struct srp_target_port
*target
)
376 ret
= srp_lookup_path(target
);
381 init_completion(&target
->done
);
382 ret
= srp_send_req(target
);
385 wait_for_completion(&target
->done
);
388 * The CM event handling code will set status to
389 * SRP_PORT_REDIRECT if we get a port redirect REJ
390 * back, or SRP_DLID_REDIRECT if we get a lid/qp
393 switch (target
->status
) {
397 case SRP_PORT_REDIRECT
:
398 ret
= srp_lookup_path(target
);
403 case SRP_DLID_REDIRECT
:
407 return target
->status
;
412 static int srp_reconnect_target(struct srp_target_port
*target
)
414 struct ib_cm_id
*new_cm_id
;
415 struct ib_qp_attr qp_attr
;
416 struct srp_request
*req
;
421 spin_lock_irq(target
->scsi_host
->host_lock
);
422 if (target
->state
!= SRP_TARGET_LIVE
) {
423 spin_unlock_irq(target
->scsi_host
->host_lock
);
426 target
->state
= SRP_TARGET_CONNECTING
;
427 spin_unlock_irq(target
->scsi_host
->host_lock
);
429 srp_disconnect_target(target
);
431 * Now get a new local CM ID so that we avoid confusing the
432 * target in case things are really fouled up.
434 new_cm_id
= ib_create_cm_id(target
->srp_host
->dev
,
435 srp_cm_handler
, target
);
436 if (IS_ERR(new_cm_id
)) {
437 ret
= PTR_ERR(new_cm_id
);
440 ib_destroy_cm_id(target
->cm_id
);
441 target
->cm_id
= new_cm_id
;
443 qp_attr
.qp_state
= IB_QPS_RESET
;
444 ret
= ib_modify_qp(target
->qp
, &qp_attr
, IB_QP_STATE
);
448 ret
= srp_init_qp(target
, target
->qp
);
452 while (ib_poll_cq(target
->cq
, 1, &wc
) > 0)
455 list_for_each_entry(req
, &target
->req_queue
, list
) {
456 req
->scmnd
->result
= DID_RESET
<< 16;
457 req
->scmnd
->scsi_done(req
->scmnd
);
463 target
->req_head
= 0;
464 for (i
= 0; i
< SRP_SQ_SIZE
- 1; ++i
)
465 target
->req_ring
[i
].next
= i
+ 1;
466 target
->req_ring
[SRP_SQ_SIZE
- 1].next
= -1;
467 INIT_LIST_HEAD(&target
->req_queue
);
469 ret
= srp_connect_target(target
);
473 spin_lock_irq(target
->scsi_host
->host_lock
);
474 if (target
->state
== SRP_TARGET_CONNECTING
) {
476 target
->state
= SRP_TARGET_LIVE
;
479 spin_unlock_irq(target
->scsi_host
->host_lock
);
484 printk(KERN_ERR PFX
"reconnect failed (%d), removing target port.\n", ret
);
487 * We couldn't reconnect, so kill our target port off.
488 * However, we have to defer the real removal because we might
489 * be in the context of the SCSI error handler now, which
490 * would deadlock if we call scsi_remove_host().
492 spin_lock_irq(target
->scsi_host
->host_lock
);
493 if (target
->state
== SRP_TARGET_CONNECTING
) {
494 target
->state
= SRP_TARGET_DEAD
;
495 INIT_WORK(&target
->work
, srp_remove_work
, target
);
496 schedule_work(&target
->work
);
498 spin_unlock_irq(target
->scsi_host
->host_lock
);
503 static int srp_map_data(struct scsi_cmnd
*scmnd
, struct srp_target_port
*target
,
504 struct srp_request
*req
)
506 struct scatterlist
*scat
;
507 struct srp_cmd
*cmd
= req
->cmd
->buf
;
508 int len
, nents
, count
;
512 if (!scmnd
->request_buffer
|| scmnd
->sc_data_direction
== DMA_NONE
)
513 return sizeof (struct srp_cmd
);
515 if (scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
&&
516 scmnd
->sc_data_direction
!= DMA_TO_DEVICE
) {
517 printk(KERN_WARNING PFX
"Unhandled data direction %d\n",
518 scmnd
->sc_data_direction
);
523 * This handling of non-SG commands can be killed when the
524 * SCSI midlayer no longer generates non-SG commands.
526 if (likely(scmnd
->use_sg
)) {
527 nents
= scmnd
->use_sg
;
528 scat
= scmnd
->request_buffer
;
531 scat
= &req
->fake_sg
;
532 sg_init_one(scat
, scmnd
->request_buffer
, scmnd
->request_bufflen
);
535 count
= dma_map_sg(target
->srp_host
->dev
->dma_device
, scat
, nents
,
536 scmnd
->sc_data_direction
);
539 struct srp_direct_buf
*buf
= (void *) cmd
->add_data
;
541 fmt
= SRP_DATA_DESC_DIRECT
;
543 buf
->va
= cpu_to_be64(sg_dma_address(scat
));
544 buf
->key
= cpu_to_be32(target
->srp_host
->mr
->rkey
);
545 buf
->len
= cpu_to_be32(sg_dma_len(scat
));
547 len
= sizeof (struct srp_cmd
) +
548 sizeof (struct srp_direct_buf
);
550 struct srp_indirect_buf
*buf
= (void *) cmd
->add_data
;
553 fmt
= SRP_DATA_DESC_INDIRECT
;
555 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
556 cmd
->data_out_desc_cnt
= count
;
558 cmd
->data_in_desc_cnt
= count
;
560 buf
->table_desc
.va
= cpu_to_be64(req
->cmd
->dma
+
563 buf
->table_desc
.key
=
564 cpu_to_be32(target
->srp_host
->mr
->rkey
);
565 buf
->table_desc
.len
=
566 cpu_to_be32(count
* sizeof (struct srp_direct_buf
));
568 for (i
= 0; i
< count
; ++i
) {
569 buf
->desc_list
[i
].va
= cpu_to_be64(sg_dma_address(&scat
[i
]));
570 buf
->desc_list
[i
].key
=
571 cpu_to_be32(target
->srp_host
->mr
->rkey
);
572 buf
->desc_list
[i
].len
= cpu_to_be32(sg_dma_len(&scat
[i
]));
574 datalen
+= sg_dma_len(&scat
[i
]);
577 buf
->len
= cpu_to_be32(datalen
);
579 len
= sizeof (struct srp_cmd
) +
580 sizeof (struct srp_indirect_buf
) +
581 count
* sizeof (struct srp_direct_buf
);
584 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
585 cmd
->buf_fmt
= fmt
<< 4;
592 static void srp_unmap_data(struct scsi_cmnd
*scmnd
,
593 struct srp_target_port
*target
,
594 struct srp_request
*req
)
596 struct scatterlist
*scat
;
599 if (!scmnd
->request_buffer
||
600 (scmnd
->sc_data_direction
!= DMA_TO_DEVICE
&&
601 scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
))
605 * This handling of non-SG commands can be killed when the
606 * SCSI midlayer no longer generates non-SG commands.
608 if (likely(scmnd
->use_sg
)) {
609 nents
= scmnd
->use_sg
;
610 scat
= scmnd
->request_buffer
;
613 scat
= &req
->fake_sg
;
616 dma_unmap_sg(target
->srp_host
->dev
->dma_device
, scat
, nents
,
617 scmnd
->sc_data_direction
);
620 static void srp_process_rsp(struct srp_target_port
*target
, struct srp_rsp
*rsp
)
622 struct srp_request
*req
;
623 struct scsi_cmnd
*scmnd
;
627 delta
= (s32
) be32_to_cpu(rsp
->req_lim_delta
);
629 spin_lock_irqsave(target
->scsi_host
->host_lock
, flags
);
631 target
->req_lim
+= delta
;
633 req
= &target
->req_ring
[rsp
->tag
& ~SRP_TAG_TSK_MGMT
];
635 if (unlikely(rsp
->tag
& SRP_TAG_TSK_MGMT
)) {
636 if (be32_to_cpu(rsp
->resp_data_len
) < 4)
637 req
->tsk_status
= -1;
639 req
->tsk_status
= rsp
->data
[3];
640 complete(&req
->done
);
644 printk(KERN_ERR
"Null scmnd for RSP w/tag %016llx\n",
645 (unsigned long long) rsp
->tag
);
646 scmnd
->result
= rsp
->status
;
648 if (rsp
->flags
& SRP_RSP_FLAG_SNSVALID
) {
649 memcpy(scmnd
->sense_buffer
, rsp
->data
+
650 be32_to_cpu(rsp
->resp_data_len
),
651 min_t(int, be32_to_cpu(rsp
->sense_data_len
),
652 SCSI_SENSE_BUFFERSIZE
));
655 if (rsp
->flags
& (SRP_RSP_FLAG_DOOVER
| SRP_RSP_FLAG_DOUNDER
))
656 scmnd
->resid
= be32_to_cpu(rsp
->data_out_res_cnt
);
657 else if (rsp
->flags
& (SRP_RSP_FLAG_DIOVER
| SRP_RSP_FLAG_DIUNDER
))
658 scmnd
->resid
= be32_to_cpu(rsp
->data_in_res_cnt
);
660 srp_unmap_data(scmnd
, target
, req
);
662 if (!req
->tsk_mgmt
) {
664 scmnd
->host_scribble
= (void *) -1L;
665 scmnd
->scsi_done(scmnd
);
667 list_del(&req
->list
);
668 req
->next
= target
->req_head
;
669 target
->req_head
= rsp
->tag
& ~SRP_TAG_TSK_MGMT
;
674 spin_unlock_irqrestore(target
->scsi_host
->host_lock
, flags
);
677 static void srp_reconnect_work(void *target_ptr
)
679 struct srp_target_port
*target
= target_ptr
;
681 srp_reconnect_target(target
);
684 static void srp_handle_recv(struct srp_target_port
*target
, struct ib_wc
*wc
)
689 iu
= target
->rx_ring
[wc
->wr_id
& ~SRP_OP_RECV
];
691 dma_sync_single_for_cpu(target
->srp_host
->dev
->dma_device
, iu
->dma
,
692 target
->max_ti_iu_len
, DMA_FROM_DEVICE
);
694 opcode
= *(u8
*) iu
->buf
;
699 printk(KERN_ERR PFX
"recv completion, opcode 0x%02x\n", opcode
);
701 for (i
= 0; i
< wc
->byte_len
; ++i
) {
703 printk(KERN_ERR
" [%02x] ", i
);
704 printk(" %02x", ((u8
*) iu
->buf
)[i
]);
705 if ((i
+ 1) % 8 == 0)
709 if (wc
->byte_len
% 8)
715 srp_process_rsp(target
, iu
->buf
);
719 /* XXX Handle target logout */
720 printk(KERN_WARNING PFX
"Got target logout request\n");
724 printk(KERN_WARNING PFX
"Unhandled SRP opcode 0x%02x\n", opcode
);
728 dma_sync_single_for_device(target
->srp_host
->dev
->dma_device
, iu
->dma
,
729 target
->max_ti_iu_len
, DMA_FROM_DEVICE
);
732 static void srp_completion(struct ib_cq
*cq
, void *target_ptr
)
734 struct srp_target_port
*target
= target_ptr
;
738 ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
739 while (ib_poll_cq(cq
, 1, &wc
) > 0) {
741 printk(KERN_ERR PFX
"failed %s status %d\n",
742 wc
.wr_id
& SRP_OP_RECV
? "receive" : "send",
744 spin_lock_irqsave(target
->scsi_host
->host_lock
, flags
);
745 if (target
->state
== SRP_TARGET_LIVE
)
746 schedule_work(&target
->work
);
747 spin_unlock_irqrestore(target
->scsi_host
->host_lock
, flags
);
751 if (wc
.wr_id
& SRP_OP_RECV
)
752 srp_handle_recv(target
, &wc
);
758 static int __srp_post_recv(struct srp_target_port
*target
)
762 struct ib_recv_wr wr
, *bad_wr
;
766 next
= target
->rx_head
& (SRP_RQ_SIZE
- 1);
767 wr
.wr_id
= next
| SRP_OP_RECV
;
768 iu
= target
->rx_ring
[next
];
771 list
.length
= iu
->size
;
772 list
.lkey
= target
->srp_host
->mr
->lkey
;
778 ret
= ib_post_recv(target
->qp
, &wr
, &bad_wr
);
785 static int srp_post_recv(struct srp_target_port
*target
)
790 spin_lock_irqsave(target
->scsi_host
->host_lock
, flags
);
791 ret
= __srp_post_recv(target
);
792 spin_unlock_irqrestore(target
->scsi_host
->host_lock
, flags
);
798 * Must be called with target->scsi_host->host_lock held to protect
799 * req_lim and tx_head. Lock cannot be dropped between call here and
800 * call to __srp_post_send().
802 static struct srp_iu
*__srp_get_tx_iu(struct srp_target_port
*target
)
804 if (target
->tx_head
- target
->tx_tail
>= SRP_SQ_SIZE
)
807 if (unlikely(target
->req_lim
< 1)) {
808 if (printk_ratelimit())
809 printk(KERN_DEBUG PFX
"Target has req_lim %d\n",
814 return target
->tx_ring
[target
->tx_head
& SRP_SQ_SIZE
];
818 * Must be called with target->scsi_host->host_lock held to protect
819 * req_lim and tx_head.
821 static int __srp_post_send(struct srp_target_port
*target
,
822 struct srp_iu
*iu
, int len
)
825 struct ib_send_wr wr
, *bad_wr
;
830 list
.lkey
= target
->srp_host
->mr
->lkey
;
833 wr
.wr_id
= target
->tx_head
& SRP_SQ_SIZE
;
836 wr
.opcode
= IB_WR_SEND
;
837 wr
.send_flags
= IB_SEND_SIGNALED
;
839 ret
= ib_post_send(target
->qp
, &wr
, &bad_wr
);
849 static int srp_queuecommand(struct scsi_cmnd
*scmnd
,
850 void (*done
)(struct scsi_cmnd
*))
852 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
853 struct srp_request
*req
;
859 if (target
->state
== SRP_TARGET_CONNECTING
)
862 if (target
->state
== SRP_TARGET_DEAD
||
863 target
->state
== SRP_TARGET_REMOVED
) {
864 scmnd
->result
= DID_BAD_TARGET
<< 16;
869 iu
= __srp_get_tx_iu(target
);
873 dma_sync_single_for_cpu(target
->srp_host
->dev
->dma_device
, iu
->dma
,
874 SRP_MAX_IU_LEN
, DMA_TO_DEVICE
);
876 req_index
= target
->req_head
;
878 scmnd
->scsi_done
= done
;
880 scmnd
->host_scribble
= (void *) req_index
;
883 memset(cmd
, 0, sizeof *cmd
);
885 cmd
->opcode
= SRP_CMD
;
886 cmd
->lun
= cpu_to_be64((u64
) scmnd
->device
->lun
<< 48);
887 cmd
->tag
= req_index
;
888 memcpy(cmd
->cdb
, scmnd
->cmnd
, scmnd
->cmd_len
);
890 req
= &target
->req_ring
[req_index
];
895 req
->tsk_mgmt
= NULL
;
897 len
= srp_map_data(scmnd
, target
, req
);
899 printk(KERN_ERR PFX
"Failed to map data\n");
903 if (__srp_post_recv(target
)) {
904 printk(KERN_ERR PFX
"Recv failed\n");
908 dma_sync_single_for_device(target
->srp_host
->dev
->dma_device
, iu
->dma
,
909 SRP_MAX_IU_LEN
, DMA_TO_DEVICE
);
911 if (__srp_post_send(target
, iu
, len
)) {
912 printk(KERN_ERR PFX
"Send failed\n");
916 target
->req_head
= req
->next
;
917 list_add_tail(&req
->list
, &target
->req_queue
);
922 srp_unmap_data(scmnd
, target
, req
);
925 return SCSI_MLQUEUE_HOST_BUSY
;
928 static int srp_alloc_iu_bufs(struct srp_target_port
*target
)
932 for (i
= 0; i
< SRP_RQ_SIZE
; ++i
) {
933 target
->rx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
934 target
->max_ti_iu_len
,
935 GFP_KERNEL
, DMA_FROM_DEVICE
);
936 if (!target
->rx_ring
[i
])
940 for (i
= 0; i
< SRP_SQ_SIZE
+ 1; ++i
) {
941 target
->tx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
943 GFP_KERNEL
, DMA_TO_DEVICE
);
944 if (!target
->tx_ring
[i
])
951 for (i
= 0; i
< SRP_RQ_SIZE
; ++i
) {
952 srp_free_iu(target
->srp_host
, target
->rx_ring
[i
]);
953 target
->rx_ring
[i
] = NULL
;
956 for (i
= 0; i
< SRP_SQ_SIZE
+ 1; ++i
) {
957 srp_free_iu(target
->srp_host
, target
->tx_ring
[i
]);
958 target
->tx_ring
[i
] = NULL
;
964 static void srp_cm_rej_handler(struct ib_cm_id
*cm_id
,
965 struct ib_cm_event
*event
,
966 struct srp_target_port
*target
)
968 struct ib_class_port_info
*cpi
;
971 switch (event
->param
.rej_rcvd
.reason
) {
972 case IB_CM_REJ_PORT_CM_REDIRECT
:
973 cpi
= event
->param
.rej_rcvd
.ari
;
974 target
->path
.dlid
= cpi
->redirect_lid
;
975 target
->path
.pkey
= cpi
->redirect_pkey
;
976 cm_id
->remote_cm_qpn
= be32_to_cpu(cpi
->redirect_qp
) & 0x00ffffff;
977 memcpy(target
->path
.dgid
.raw
, cpi
->redirect_gid
, 16);
979 target
->status
= target
->path
.dlid
?
980 SRP_DLID_REDIRECT
: SRP_PORT_REDIRECT
;
983 case IB_CM_REJ_PORT_REDIRECT
:
984 if (topspin_workarounds
&&
985 !memcmp(&target
->ioc_guid
, topspin_oui
, 3)) {
987 * Topspin/Cisco SRP gateways incorrectly send
988 * reject reason code 25 when they mean 24
991 memcpy(target
->path
.dgid
.raw
,
992 event
->param
.rej_rcvd
.ari
, 16);
994 printk(KERN_DEBUG PFX
"Topspin/Cisco redirect to target port GID %016llx%016llx\n",
995 (unsigned long long) be64_to_cpu(target
->path
.dgid
.global
.subnet_prefix
),
996 (unsigned long long) be64_to_cpu(target
->path
.dgid
.global
.interface_id
));
998 target
->status
= SRP_PORT_REDIRECT
;
1000 printk(KERN_WARNING
" REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1001 target
->status
= -ECONNRESET
;
1005 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID
:
1006 printk(KERN_WARNING
" REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1007 target
->status
= -ECONNRESET
;
1010 case IB_CM_REJ_CONSUMER_DEFINED
:
1011 opcode
= *(u8
*) event
->private_data
;
1012 if (opcode
== SRP_LOGIN_REJ
) {
1013 struct srp_login_rej
*rej
= event
->private_data
;
1014 u32 reason
= be32_to_cpu(rej
->reason
);
1016 if (reason
== SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE
)
1017 printk(KERN_WARNING PFX
1018 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1020 printk(KERN_WARNING PFX
1021 "SRP LOGIN REJECTED, reason 0x%08x\n", reason
);
1023 printk(KERN_WARNING
" REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1024 " opcode 0x%02x\n", opcode
);
1025 target
->status
= -ECONNRESET
;
1029 printk(KERN_WARNING
" REJ reason 0x%x\n",
1030 event
->param
.rej_rcvd
.reason
);
1031 target
->status
= -ECONNRESET
;
1035 static int srp_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
1037 struct srp_target_port
*target
= cm_id
->context
;
1038 struct ib_qp_attr
*qp_attr
= NULL
;
1043 switch (event
->event
) {
1044 case IB_CM_REQ_ERROR
:
1045 printk(KERN_DEBUG PFX
"Sending CM REQ failed\n");
1047 target
->status
= -ECONNRESET
;
1050 case IB_CM_REP_RECEIVED
:
1052 opcode
= *(u8
*) event
->private_data
;
1054 if (opcode
== SRP_LOGIN_RSP
) {
1055 struct srp_login_rsp
*rsp
= event
->private_data
;
1057 target
->max_ti_iu_len
= be32_to_cpu(rsp
->max_ti_iu_len
);
1058 target
->req_lim
= be32_to_cpu(rsp
->req_lim_delta
);
1060 target
->scsi_host
->can_queue
= min(target
->req_lim
,
1061 target
->scsi_host
->can_queue
);
1063 printk(KERN_WARNING PFX
"Unhandled RSP opcode %#x\n", opcode
);
1064 target
->status
= -ECONNRESET
;
1068 target
->status
= srp_alloc_iu_bufs(target
);
1072 qp_attr
= kmalloc(sizeof *qp_attr
, GFP_KERNEL
);
1074 target
->status
= -ENOMEM
;
1078 qp_attr
->qp_state
= IB_QPS_RTR
;
1079 target
->status
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
1083 target
->status
= ib_modify_qp(target
->qp
, qp_attr
, attr_mask
);
1087 target
->status
= srp_post_recv(target
);
1091 qp_attr
->qp_state
= IB_QPS_RTS
;
1092 target
->status
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
1096 target
->status
= ib_modify_qp(target
->qp
, qp_attr
, attr_mask
);
1100 target
->status
= ib_send_cm_rtu(cm_id
, NULL
, 0);
1106 case IB_CM_REJ_RECEIVED
:
1107 printk(KERN_DEBUG PFX
"REJ received\n");
1110 srp_cm_rej_handler(cm_id
, event
, target
);
1113 case IB_CM_MRA_RECEIVED
:
1114 printk(KERN_ERR PFX
"MRA received\n");
1117 case IB_CM_DREP_RECEIVED
:
1120 case IB_CM_TIMEWAIT_EXIT
:
1121 printk(KERN_ERR PFX
"connection closed\n");
1128 printk(KERN_WARNING PFX
"Unhandled CM event %d\n", event
->event
);
1133 complete(&target
->done
);
1140 static int srp_send_tsk_mgmt(struct scsi_cmnd
*scmnd
, u8 func
)
1142 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
1143 struct srp_request
*req
;
1145 struct srp_tsk_mgmt
*tsk_mgmt
;
1149 spin_lock_irq(target
->scsi_host
->host_lock
);
1151 if (target
->state
== SRP_TARGET_DEAD
||
1152 target
->state
== SRP_TARGET_REMOVED
) {
1153 scmnd
->result
= DID_BAD_TARGET
<< 16;
1157 if (scmnd
->host_scribble
== (void *) -1L)
1160 req_index
= (long) scmnd
->host_scribble
;
1161 printk(KERN_ERR
"Abort for req_index %d\n", req_index
);
1163 req
= &target
->req_ring
[req_index
];
1164 init_completion(&req
->done
);
1166 iu
= __srp_get_tx_iu(target
);
1171 memset(tsk_mgmt
, 0, sizeof *tsk_mgmt
);
1173 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1174 tsk_mgmt
->lun
= cpu_to_be64((u64
) scmnd
->device
->lun
<< 48);
1175 tsk_mgmt
->tag
= req_index
| SRP_TAG_TSK_MGMT
;
1176 tsk_mgmt
->tsk_mgmt_func
= func
;
1177 tsk_mgmt
->task_tag
= req_index
;
1179 if (__srp_post_send(target
, iu
, sizeof *tsk_mgmt
))
1184 spin_unlock_irq(target
->scsi_host
->host_lock
);
1185 if (!wait_for_completion_timeout(&req
->done
,
1186 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS
)))
1188 spin_lock_irq(target
->scsi_host
->host_lock
);
1190 if (req
->cmd_done
) {
1191 list_del(&req
->list
);
1192 req
->next
= target
->req_head
;
1193 target
->req_head
= req_index
;
1195 scmnd
->scsi_done(scmnd
);
1196 } else if (!req
->tsk_status
) {
1197 scmnd
->result
= DID_ABORT
<< 16;
1202 spin_unlock_irq(target
->scsi_host
->host_lock
);
1206 static int srp_abort(struct scsi_cmnd
*scmnd
)
1208 printk(KERN_ERR
"SRP abort called\n");
1210 return srp_send_tsk_mgmt(scmnd
, SRP_TSK_ABORT_TASK
);
1213 static int srp_reset_device(struct scsi_cmnd
*scmnd
)
1215 printk(KERN_ERR
"SRP reset_device called\n");
1217 return srp_send_tsk_mgmt(scmnd
, SRP_TSK_LUN_RESET
);
1220 static int srp_reset_host(struct scsi_cmnd
*scmnd
)
1222 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
1225 printk(KERN_ERR PFX
"SRP reset_host called\n");
1227 if (!srp_reconnect_target(target
))
1233 static ssize_t
show_id_ext(struct class_device
*cdev
, char *buf
)
1235 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1237 if (target
->state
== SRP_TARGET_DEAD
||
1238 target
->state
== SRP_TARGET_REMOVED
)
1241 return sprintf(buf
, "0x%016llx\n",
1242 (unsigned long long) be64_to_cpu(target
->id_ext
));
1245 static ssize_t
show_ioc_guid(struct class_device
*cdev
, char *buf
)
1247 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1249 if (target
->state
== SRP_TARGET_DEAD
||
1250 target
->state
== SRP_TARGET_REMOVED
)
1253 return sprintf(buf
, "0x%016llx\n",
1254 (unsigned long long) be64_to_cpu(target
->ioc_guid
));
1257 static ssize_t
show_service_id(struct class_device
*cdev
, char *buf
)
1259 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1261 if (target
->state
== SRP_TARGET_DEAD
||
1262 target
->state
== SRP_TARGET_REMOVED
)
1265 return sprintf(buf
, "0x%016llx\n",
1266 (unsigned long long) be64_to_cpu(target
->service_id
));
1269 static ssize_t
show_pkey(struct class_device
*cdev
, char *buf
)
1271 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1273 if (target
->state
== SRP_TARGET_DEAD
||
1274 target
->state
== SRP_TARGET_REMOVED
)
1277 return sprintf(buf
, "0x%04x\n", be16_to_cpu(target
->path
.pkey
));
1280 static ssize_t
show_dgid(struct class_device
*cdev
, char *buf
)
1282 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1284 if (target
->state
== SRP_TARGET_DEAD
||
1285 target
->state
== SRP_TARGET_REMOVED
)
1288 return sprintf(buf
, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1289 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[0]),
1290 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[1]),
1291 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[2]),
1292 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[3]),
1293 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[4]),
1294 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[5]),
1295 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[6]),
1296 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[7]));
1299 static CLASS_DEVICE_ATTR(id_ext
, S_IRUGO
, show_id_ext
, NULL
);
1300 static CLASS_DEVICE_ATTR(ioc_guid
, S_IRUGO
, show_ioc_guid
, NULL
);
1301 static CLASS_DEVICE_ATTR(service_id
, S_IRUGO
, show_service_id
, NULL
);
1302 static CLASS_DEVICE_ATTR(pkey
, S_IRUGO
, show_pkey
, NULL
);
1303 static CLASS_DEVICE_ATTR(dgid
, S_IRUGO
, show_dgid
, NULL
);
1305 static struct class_device_attribute
*srp_host_attrs
[] = {
1306 &class_device_attr_id_ext
,
1307 &class_device_attr_ioc_guid
,
1308 &class_device_attr_service_id
,
1309 &class_device_attr_pkey
,
1310 &class_device_attr_dgid
,
1314 static struct scsi_host_template srp_template
= {
1315 .module
= THIS_MODULE
,
1317 .info
= srp_target_info
,
1318 .queuecommand
= srp_queuecommand
,
1319 .eh_abort_handler
= srp_abort
,
1320 .eh_device_reset_handler
= srp_reset_device
,
1321 .eh_host_reset_handler
= srp_reset_host
,
1322 .can_queue
= SRP_SQ_SIZE
,
1324 .sg_tablesize
= SRP_MAX_INDIRECT
,
1325 .cmd_per_lun
= SRP_SQ_SIZE
,
1326 .use_clustering
= ENABLE_CLUSTERING
,
1327 .shost_attrs
= srp_host_attrs
1330 static int srp_add_target(struct srp_host
*host
, struct srp_target_port
*target
)
1332 sprintf(target
->target_name
, "SRP.T10:%016llX",
1333 (unsigned long long) be64_to_cpu(target
->id_ext
));
1335 if (scsi_add_host(target
->scsi_host
, host
->dev
->dma_device
))
1338 mutex_lock(&host
->target_mutex
);
1339 list_add_tail(&target
->list
, &host
->target_list
);
1340 mutex_unlock(&host
->target_mutex
);
1342 target
->state
= SRP_TARGET_LIVE
;
1344 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1345 scsi_scan_target(&target
->scsi_host
->shost_gendev
,
1346 0, target
->scsi_id
, ~0, 0);
1351 static void srp_release_class_dev(struct class_device
*class_dev
)
1353 struct srp_host
*host
=
1354 container_of(class_dev
, struct srp_host
, class_dev
);
1356 complete(&host
->released
);
1359 static struct class srp_class
= {
1360 .name
= "infiniband_srp",
1361 .release
= srp_release_class_dev
1365 * Target ports are added by writing
1367 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1368 * pkey=<P_Key>,service_id=<service ID>
1370 * to the add_target sysfs attribute.
1374 SRP_OPT_ID_EXT
= 1 << 0,
1375 SRP_OPT_IOC_GUID
= 1 << 1,
1376 SRP_OPT_DGID
= 1 << 2,
1377 SRP_OPT_PKEY
= 1 << 3,
1378 SRP_OPT_SERVICE_ID
= 1 << 4,
1379 SRP_OPT_MAX_SECT
= 1 << 5,
1380 SRP_OPT_ALL
= (SRP_OPT_ID_EXT
|
1384 SRP_OPT_SERVICE_ID
),
1387 static match_table_t srp_opt_tokens
= {
1388 { SRP_OPT_ID_EXT
, "id_ext=%s" },
1389 { SRP_OPT_IOC_GUID
, "ioc_guid=%s" },
1390 { SRP_OPT_DGID
, "dgid=%s" },
1391 { SRP_OPT_PKEY
, "pkey=%x" },
1392 { SRP_OPT_SERVICE_ID
, "service_id=%s" },
1393 { SRP_OPT_MAX_SECT
, "max_sect=%d" },
1394 { SRP_OPT_ERR
, NULL
}
1397 static int srp_parse_options(const char *buf
, struct srp_target_port
*target
)
1399 char *options
, *sep_opt
;
1402 substring_t args
[MAX_OPT_ARGS
];
1408 options
= kstrdup(buf
, GFP_KERNEL
);
1413 while ((p
= strsep(&sep_opt
, ",")) != NULL
) {
1417 token
= match_token(p
, srp_opt_tokens
, args
);
1421 case SRP_OPT_ID_EXT
:
1422 p
= match_strdup(args
);
1423 target
->id_ext
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1427 case SRP_OPT_IOC_GUID
:
1428 p
= match_strdup(args
);
1429 target
->ioc_guid
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1434 p
= match_strdup(args
);
1435 if (strlen(p
) != 32) {
1436 printk(KERN_WARNING PFX
"bad dest GID parameter '%s'\n", p
);
1441 for (i
= 0; i
< 16; ++i
) {
1442 strlcpy(dgid
, p
+ i
* 2, 3);
1443 target
->path
.dgid
.raw
[i
] = simple_strtoul(dgid
, NULL
, 16);
1449 if (match_hex(args
, &token
)) {
1450 printk(KERN_WARNING PFX
"bad P_Key parameter '%s'\n", p
);
1453 target
->path
.pkey
= cpu_to_be16(token
);
1456 case SRP_OPT_SERVICE_ID
:
1457 p
= match_strdup(args
);
1458 target
->service_id
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1462 case SRP_OPT_MAX_SECT
:
1463 if (match_int(args
, &token
)) {
1464 printk(KERN_WARNING PFX
"bad max sect parameter '%s'\n", p
);
1467 target
->scsi_host
->max_sectors
= token
;
1471 printk(KERN_WARNING PFX
"unknown parameter or missing value "
1472 "'%s' in target creation request\n", p
);
1477 if ((opt_mask
& SRP_OPT_ALL
) == SRP_OPT_ALL
)
1480 for (i
= 0; i
< ARRAY_SIZE(srp_opt_tokens
); ++i
)
1481 if ((srp_opt_tokens
[i
].token
& SRP_OPT_ALL
) &&
1482 !(srp_opt_tokens
[i
].token
& opt_mask
))
1483 printk(KERN_WARNING PFX
"target creation request is "
1484 "missing parameter '%s'\n",
1485 srp_opt_tokens
[i
].pattern
);
1492 static ssize_t
srp_create_target(struct class_device
*class_dev
,
1493 const char *buf
, size_t count
)
1495 struct srp_host
*host
=
1496 container_of(class_dev
, struct srp_host
, class_dev
);
1497 struct Scsi_Host
*target_host
;
1498 struct srp_target_port
*target
;
1502 target_host
= scsi_host_alloc(&srp_template
,
1503 sizeof (struct srp_target_port
));
1507 target_host
->max_lun
= SRP_MAX_LUN
;
1509 target
= host_to_target(target_host
);
1510 memset(target
, 0, sizeof *target
);
1512 target
->scsi_host
= target_host
;
1513 target
->srp_host
= host
;
1515 INIT_WORK(&target
->work
, srp_reconnect_work
, target
);
1517 for (i
= 0; i
< SRP_SQ_SIZE
- 1; ++i
)
1518 target
->req_ring
[i
].next
= i
+ 1;
1519 target
->req_ring
[SRP_SQ_SIZE
- 1].next
= -1;
1520 INIT_LIST_HEAD(&target
->req_queue
);
1522 ret
= srp_parse_options(buf
, target
);
1526 ib_get_cached_gid(host
->dev
, host
->port
, 0, &target
->path
.sgid
);
1528 printk(KERN_DEBUG PFX
"new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1529 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1530 (unsigned long long) be64_to_cpu(target
->id_ext
),
1531 (unsigned long long) be64_to_cpu(target
->ioc_guid
),
1532 be16_to_cpu(target
->path
.pkey
),
1533 (unsigned long long) be64_to_cpu(target
->service_id
),
1534 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[0]),
1535 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[2]),
1536 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[4]),
1537 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[6]),
1538 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[8]),
1539 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[10]),
1540 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[12]),
1541 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[14]));
1543 ret
= srp_create_target_ib(target
);
1547 target
->cm_id
= ib_create_cm_id(host
->dev
, srp_cm_handler
, target
);
1548 if (IS_ERR(target
->cm_id
)) {
1549 ret
= PTR_ERR(target
->cm_id
);
1553 ret
= srp_connect_target(target
);
1555 printk(KERN_ERR PFX
"Connection failed\n");
1559 ret
= srp_add_target(host
, target
);
1561 goto err_disconnect
;
1566 srp_disconnect_target(target
);
1569 ib_destroy_cm_id(target
->cm_id
);
1572 srp_free_target_ib(target
);
1575 scsi_host_put(target_host
);
1580 static CLASS_DEVICE_ATTR(add_target
, S_IWUSR
, NULL
, srp_create_target
);
1582 static ssize_t
show_ibdev(struct class_device
*class_dev
, char *buf
)
1584 struct srp_host
*host
=
1585 container_of(class_dev
, struct srp_host
, class_dev
);
1587 return sprintf(buf
, "%s\n", host
->dev
->name
);
1590 static CLASS_DEVICE_ATTR(ibdev
, S_IRUGO
, show_ibdev
, NULL
);
1592 static ssize_t
show_port(struct class_device
*class_dev
, char *buf
)
1594 struct srp_host
*host
=
1595 container_of(class_dev
, struct srp_host
, class_dev
);
1597 return sprintf(buf
, "%d\n", host
->port
);
1600 static CLASS_DEVICE_ATTR(port
, S_IRUGO
, show_port
, NULL
);
1602 static struct srp_host
*srp_add_port(struct ib_device
*device
, u8 port
)
1604 struct srp_host
*host
;
1606 host
= kzalloc(sizeof *host
, GFP_KERNEL
);
1610 INIT_LIST_HEAD(&host
->target_list
);
1611 mutex_init(&host
->target_mutex
);
1612 init_completion(&host
->released
);
1616 host
->initiator_port_id
[7] = port
;
1617 memcpy(host
->initiator_port_id
+ 8, &device
->node_guid
, 8);
1619 host
->pd
= ib_alloc_pd(device
);
1620 if (IS_ERR(host
->pd
))
1623 host
->mr
= ib_get_dma_mr(host
->pd
,
1624 IB_ACCESS_LOCAL_WRITE
|
1625 IB_ACCESS_REMOTE_READ
|
1626 IB_ACCESS_REMOTE_WRITE
);
1627 if (IS_ERR(host
->mr
))
1630 host
->class_dev
.class = &srp_class
;
1631 host
->class_dev
.dev
= device
->dma_device
;
1632 snprintf(host
->class_dev
.class_id
, BUS_ID_SIZE
, "srp-%s-%d",
1633 device
->name
, port
);
1635 if (class_device_register(&host
->class_dev
))
1637 if (class_device_create_file(&host
->class_dev
, &class_device_attr_add_target
))
1639 if (class_device_create_file(&host
->class_dev
, &class_device_attr_ibdev
))
1641 if (class_device_create_file(&host
->class_dev
, &class_device_attr_port
))
1647 class_device_unregister(&host
->class_dev
);
1650 ib_dereg_mr(host
->mr
);
1653 ib_dealloc_pd(host
->pd
);
1661 static void srp_add_one(struct ib_device
*device
)
1663 struct list_head
*dev_list
;
1664 struct srp_host
*host
;
1667 dev_list
= kmalloc(sizeof *dev_list
, GFP_KERNEL
);
1671 INIT_LIST_HEAD(dev_list
);
1673 if (device
->node_type
== IB_NODE_SWITCH
) {
1678 e
= device
->phys_port_cnt
;
1681 for (p
= s
; p
<= e
; ++p
) {
1682 host
= srp_add_port(device
, p
);
1684 list_add_tail(&host
->list
, dev_list
);
1687 ib_set_client_data(device
, &srp_client
, dev_list
);
1690 static void srp_remove_one(struct ib_device
*device
)
1692 struct list_head
*dev_list
;
1693 struct srp_host
*host
, *tmp_host
;
1694 LIST_HEAD(target_list
);
1695 struct srp_target_port
*target
, *tmp_target
;
1696 unsigned long flags
;
1698 dev_list
= ib_get_client_data(device
, &srp_client
);
1700 list_for_each_entry_safe(host
, tmp_host
, dev_list
, list
) {
1701 class_device_unregister(&host
->class_dev
);
1703 * Wait for the sysfs entry to go away, so that no new
1704 * target ports can be created.
1706 wait_for_completion(&host
->released
);
1709 * Mark all target ports as removed, so we stop queueing
1710 * commands and don't try to reconnect.
1712 mutex_lock(&host
->target_mutex
);
1713 list_for_each_entry_safe(target
, tmp_target
,
1714 &host
->target_list
, list
) {
1715 spin_lock_irqsave(target
->scsi_host
->host_lock
, flags
);
1716 if (target
->state
!= SRP_TARGET_REMOVED
)
1717 target
->state
= SRP_TARGET_REMOVED
;
1718 spin_unlock_irqrestore(target
->scsi_host
->host_lock
, flags
);
1720 mutex_unlock(&host
->target_mutex
);
1723 * Wait for any reconnection tasks that may have
1724 * started before we marked our target ports as
1725 * removed, and any target port removal tasks.
1727 flush_scheduled_work();
1729 list_for_each_entry_safe(target
, tmp_target
,
1730 &host
->target_list
, list
) {
1731 scsi_remove_host(target
->scsi_host
);
1732 srp_disconnect_target(target
);
1733 ib_destroy_cm_id(target
->cm_id
);
1734 srp_free_target_ib(target
);
1735 scsi_host_put(target
->scsi_host
);
1738 ib_dereg_mr(host
->mr
);
1739 ib_dealloc_pd(host
->pd
);
1746 static int __init
srp_init_module(void)
1750 ret
= class_register(&srp_class
);
1752 printk(KERN_ERR PFX
"couldn't register class infiniband_srp\n");
1756 ret
= ib_register_client(&srp_client
);
1758 printk(KERN_ERR PFX
"couldn't register IB client\n");
1759 class_unregister(&srp_class
);
1766 static void __exit
srp_cleanup_module(void)
1768 ib_unregister_client(&srp_client
);
1769 class_unregister(&srp_class
);
1772 module_init(srp_init_module
);
1773 module_exit(srp_cleanup_module
);