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 srp_sg_tablesize
= SRP_DEF_SG_TABLESIZE
;
66 static int srp_max_iu_len
;
68 module_param(srp_sg_tablesize
, int, 0444);
69 MODULE_PARM_DESC(srp_sg_tablesize
,
70 "Max number of gather/scatter entries per I/O (default is 12)");
72 static int topspin_workarounds
= 1;
74 module_param(topspin_workarounds
, int, 0444);
75 MODULE_PARM_DESC(topspin_workarounds
,
76 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
78 static const u8 topspin_oui
[3] = { 0x00, 0x05, 0xad };
80 static int mellanox_workarounds
= 1;
82 module_param(mellanox_workarounds
, int, 0444);
83 MODULE_PARM_DESC(mellanox_workarounds
,
84 "Enable workarounds for Mellanox SRP target bugs if != 0");
86 static const u8 mellanox_oui
[3] = { 0x00, 0x02, 0xc9 };
88 static void srp_add_one(struct ib_device
*device
);
89 static void srp_remove_one(struct ib_device
*device
);
90 static void srp_completion(struct ib_cq
*cq
, void *target_ptr
);
91 static int srp_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
);
93 static struct ib_client srp_client
= {
96 .remove
= srp_remove_one
99 static struct ib_sa_client srp_sa_client
;
101 static inline struct srp_target_port
*host_to_target(struct Scsi_Host
*host
)
103 return (struct srp_target_port
*) host
->hostdata
;
106 static const char *srp_target_info(struct Scsi_Host
*host
)
108 return host_to_target(host
)->target_name
;
111 static struct srp_iu
*srp_alloc_iu(struct srp_host
*host
, size_t size
,
113 enum dma_data_direction direction
)
117 iu
= kmalloc(sizeof *iu
, gfp_mask
);
121 iu
->buf
= kzalloc(size
, gfp_mask
);
125 iu
->dma
= dma_map_single(host
->dev
->dev
->dma_device
,
126 iu
->buf
, size
, direction
);
127 if (dma_mapping_error(iu
->dma
))
131 iu
->direction
= direction
;
143 static void srp_free_iu(struct srp_host
*host
, struct srp_iu
*iu
)
148 dma_unmap_single(host
->dev
->dev
->dma_device
,
149 iu
->dma
, iu
->size
, iu
->direction
);
154 static void srp_qp_event(struct ib_event
*event
, void *context
)
156 printk(KERN_ERR PFX
"QP event %d\n", event
->event
);
159 static int srp_init_qp(struct srp_target_port
*target
,
162 struct ib_qp_attr
*attr
;
165 attr
= kmalloc(sizeof *attr
, GFP_KERNEL
);
169 ret
= ib_find_cached_pkey(target
->srp_host
->dev
->dev
,
170 target
->srp_host
->port
,
171 be16_to_cpu(target
->path
.pkey
),
176 attr
->qp_state
= IB_QPS_INIT
;
177 attr
->qp_access_flags
= (IB_ACCESS_REMOTE_READ
|
178 IB_ACCESS_REMOTE_WRITE
);
179 attr
->port_num
= target
->srp_host
->port
;
181 ret
= ib_modify_qp(qp
, attr
,
192 static int srp_create_target_ib(struct srp_target_port
*target
)
194 struct ib_qp_init_attr
*init_attr
;
197 init_attr
= kzalloc(sizeof *init_attr
, GFP_KERNEL
);
201 target
->cq
= ib_create_cq(target
->srp_host
->dev
->dev
, srp_completion
,
202 NULL
, target
, SRP_CQ_SIZE
);
203 if (IS_ERR(target
->cq
)) {
204 ret
= PTR_ERR(target
->cq
);
208 ib_req_notify_cq(target
->cq
, IB_CQ_NEXT_COMP
);
210 init_attr
->event_handler
= srp_qp_event
;
211 init_attr
->cap
.max_send_wr
= SRP_SQ_SIZE
;
212 init_attr
->cap
.max_recv_wr
= SRP_RQ_SIZE
;
213 init_attr
->cap
.max_recv_sge
= 1;
214 init_attr
->cap
.max_send_sge
= 1;
215 init_attr
->sq_sig_type
= IB_SIGNAL_ALL_WR
;
216 init_attr
->qp_type
= IB_QPT_RC
;
217 init_attr
->send_cq
= target
->cq
;
218 init_attr
->recv_cq
= target
->cq
;
220 target
->qp
= ib_create_qp(target
->srp_host
->dev
->pd
, init_attr
);
221 if (IS_ERR(target
->qp
)) {
222 ret
= PTR_ERR(target
->qp
);
223 ib_destroy_cq(target
->cq
);
227 ret
= srp_init_qp(target
, target
->qp
);
229 ib_destroy_qp(target
->qp
);
230 ib_destroy_cq(target
->cq
);
239 static void srp_free_target_ib(struct srp_target_port
*target
)
243 ib_destroy_qp(target
->qp
);
244 ib_destroy_cq(target
->cq
);
246 for (i
= 0; i
< SRP_RQ_SIZE
; ++i
)
247 srp_free_iu(target
->srp_host
, target
->rx_ring
[i
]);
248 for (i
= 0; i
< SRP_SQ_SIZE
+ 1; ++i
)
249 srp_free_iu(target
->srp_host
, target
->tx_ring
[i
]);
252 static void srp_path_rec_completion(int status
,
253 struct ib_sa_path_rec
*pathrec
,
256 struct srp_target_port
*target
= target_ptr
;
258 target
->status
= status
;
260 printk(KERN_ERR PFX
"Got failed path rec status %d\n", status
);
262 target
->path
= *pathrec
;
263 complete(&target
->done
);
266 static int srp_lookup_path(struct srp_target_port
*target
)
268 target
->path
.numb_path
= 1;
270 init_completion(&target
->done
);
272 target
->path_query_id
= ib_sa_path_rec_get(&srp_sa_client
,
273 target
->srp_host
->dev
->dev
,
274 target
->srp_host
->port
,
276 IB_SA_PATH_REC_DGID
|
277 IB_SA_PATH_REC_SGID
|
278 IB_SA_PATH_REC_NUMB_PATH
|
280 SRP_PATH_REC_TIMEOUT_MS
,
282 srp_path_rec_completion
,
283 target
, &target
->path_query
);
284 if (target
->path_query_id
< 0)
285 return target
->path_query_id
;
287 wait_for_completion(&target
->done
);
289 if (target
->status
< 0)
290 printk(KERN_WARNING PFX
"Path record query failed\n");
292 return target
->status
;
295 static int srp_send_req(struct srp_target_port
*target
)
298 struct ib_cm_req_param param
;
299 struct srp_login_req priv
;
303 req
= kzalloc(sizeof *req
, GFP_KERNEL
);
307 req
->param
.primary_path
= &target
->path
;
308 req
->param
.alternate_path
= NULL
;
309 req
->param
.service_id
= target
->service_id
;
310 req
->param
.qp_num
= target
->qp
->qp_num
;
311 req
->param
.qp_type
= target
->qp
->qp_type
;
312 req
->param
.private_data
= &req
->priv
;
313 req
->param
.private_data_len
= sizeof req
->priv
;
314 req
->param
.flow_control
= 1;
316 get_random_bytes(&req
->param
.starting_psn
, 4);
317 req
->param
.starting_psn
&= 0xffffff;
320 * Pick some arbitrary defaults here; we could make these
321 * module parameters if anyone cared about setting them.
323 req
->param
.responder_resources
= 4;
324 req
->param
.remote_cm_response_timeout
= 20;
325 req
->param
.local_cm_response_timeout
= 20;
326 req
->param
.retry_count
= 7;
327 req
->param
.rnr_retry_count
= 7;
328 req
->param
.max_cm_retries
= 15;
330 req
->priv
.opcode
= SRP_LOGIN_REQ
;
332 req
->priv
.req_it_iu_len
= cpu_to_be32(srp_max_iu_len
);
333 req
->priv
.req_buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
|
334 SRP_BUF_FORMAT_INDIRECT
);
336 * In the published SRP specification (draft rev. 16a), the
337 * port identifier format is 8 bytes of ID extension followed
338 * by 8 bytes of GUID. Older drafts put the two halves in the
339 * opposite order, so that the GUID comes first.
341 * Targets conforming to these obsolete drafts can be
342 * recognized by the I/O Class they report.
344 if (target
->io_class
== SRP_REV10_IB_IO_CLASS
) {
345 memcpy(req
->priv
.initiator_port_id
,
346 &target
->path
.sgid
.global
.interface_id
, 8);
347 memcpy(req
->priv
.initiator_port_id
+ 8,
348 &target
->initiator_ext
, 8);
349 memcpy(req
->priv
.target_port_id
, &target
->ioc_guid
, 8);
350 memcpy(req
->priv
.target_port_id
+ 8, &target
->id_ext
, 8);
352 memcpy(req
->priv
.initiator_port_id
,
353 &target
->initiator_ext
, 8);
354 memcpy(req
->priv
.initiator_port_id
+ 8,
355 &target
->path
.sgid
.global
.interface_id
, 8);
356 memcpy(req
->priv
.target_port_id
, &target
->id_ext
, 8);
357 memcpy(req
->priv
.target_port_id
+ 8, &target
->ioc_guid
, 8);
361 * Topspin/Cisco SRP targets will reject our login unless we
362 * zero out the first 8 bytes of our initiator port ID and set
363 * the second 8 bytes to the local node GUID.
365 if (topspin_workarounds
&& !memcmp(&target
->ioc_guid
, topspin_oui
, 3)) {
366 printk(KERN_DEBUG PFX
"Topspin/Cisco initiator port ID workaround "
367 "activated for target GUID %016llx\n",
368 (unsigned long long) be64_to_cpu(target
->ioc_guid
));
369 memset(req
->priv
.initiator_port_id
, 0, 8);
370 memcpy(req
->priv
.initiator_port_id
+ 8,
371 &target
->srp_host
->dev
->dev
->node_guid
, 8);
374 status
= ib_send_cm_req(target
->cm_id
, &req
->param
);
381 static void srp_disconnect_target(struct srp_target_port
*target
)
383 /* XXX should send SRP_I_LOGOUT request */
385 init_completion(&target
->done
);
386 if (ib_send_cm_dreq(target
->cm_id
, NULL
, 0)) {
387 printk(KERN_DEBUG PFX
"Sending CM DREQ failed\n");
390 wait_for_completion(&target
->done
);
393 static void srp_remove_work(struct work_struct
*work
)
395 struct srp_target_port
*target
=
396 container_of(work
, struct srp_target_port
, work
);
398 spin_lock_irq(target
->scsi_host
->host_lock
);
399 if (target
->state
!= SRP_TARGET_DEAD
) {
400 spin_unlock_irq(target
->scsi_host
->host_lock
);
403 target
->state
= SRP_TARGET_REMOVED
;
404 spin_unlock_irq(target
->scsi_host
->host_lock
);
406 spin_lock(&target
->srp_host
->target_lock
);
407 list_del(&target
->list
);
408 spin_unlock(&target
->srp_host
->target_lock
);
410 scsi_remove_host(target
->scsi_host
);
411 ib_destroy_cm_id(target
->cm_id
);
412 srp_free_target_ib(target
);
413 scsi_host_put(target
->scsi_host
);
416 static int srp_connect_target(struct srp_target_port
*target
)
420 ret
= srp_lookup_path(target
);
425 init_completion(&target
->done
);
426 ret
= srp_send_req(target
);
429 wait_for_completion(&target
->done
);
432 * The CM event handling code will set status to
433 * SRP_PORT_REDIRECT if we get a port redirect REJ
434 * back, or SRP_DLID_REDIRECT if we get a lid/qp
437 switch (target
->status
) {
441 case SRP_PORT_REDIRECT
:
442 ret
= srp_lookup_path(target
);
447 case SRP_DLID_REDIRECT
:
451 return target
->status
;
456 static void srp_unmap_data(struct scsi_cmnd
*scmnd
,
457 struct srp_target_port
*target
,
458 struct srp_request
*req
)
460 struct scatterlist
*scat
;
463 if (!scmnd
->request_buffer
||
464 (scmnd
->sc_data_direction
!= DMA_TO_DEVICE
&&
465 scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
))
469 ib_fmr_pool_unmap(req
->fmr
);
474 * This handling of non-SG commands can be killed when the
475 * SCSI midlayer no longer generates non-SG commands.
477 if (likely(scmnd
->use_sg
)) {
478 nents
= scmnd
->use_sg
;
479 scat
= scmnd
->request_buffer
;
482 scat
= &req
->fake_sg
;
485 dma_unmap_sg(target
->srp_host
->dev
->dev
->dma_device
, scat
, nents
,
486 scmnd
->sc_data_direction
);
489 static void srp_remove_req(struct srp_target_port
*target
, struct srp_request
*req
)
491 srp_unmap_data(req
->scmnd
, target
, req
);
492 list_move_tail(&req
->list
, &target
->free_reqs
);
495 static void srp_reset_req(struct srp_target_port
*target
, struct srp_request
*req
)
497 req
->scmnd
->result
= DID_RESET
<< 16;
498 req
->scmnd
->scsi_done(req
->scmnd
);
499 srp_remove_req(target
, req
);
502 static int srp_reconnect_target(struct srp_target_port
*target
)
504 struct ib_cm_id
*new_cm_id
;
505 struct ib_qp_attr qp_attr
;
506 struct srp_request
*req
, *tmp
;
510 spin_lock_irq(target
->scsi_host
->host_lock
);
511 if (target
->state
!= SRP_TARGET_LIVE
) {
512 spin_unlock_irq(target
->scsi_host
->host_lock
);
515 target
->state
= SRP_TARGET_CONNECTING
;
516 spin_unlock_irq(target
->scsi_host
->host_lock
);
518 srp_disconnect_target(target
);
520 * Now get a new local CM ID so that we avoid confusing the
521 * target in case things are really fouled up.
523 new_cm_id
= ib_create_cm_id(target
->srp_host
->dev
->dev
,
524 srp_cm_handler
, target
);
525 if (IS_ERR(new_cm_id
)) {
526 ret
= PTR_ERR(new_cm_id
);
529 ib_destroy_cm_id(target
->cm_id
);
530 target
->cm_id
= new_cm_id
;
532 qp_attr
.qp_state
= IB_QPS_RESET
;
533 ret
= ib_modify_qp(target
->qp
, &qp_attr
, IB_QP_STATE
);
537 ret
= srp_init_qp(target
, target
->qp
);
541 while (ib_poll_cq(target
->cq
, 1, &wc
) > 0)
544 spin_lock_irq(target
->scsi_host
->host_lock
);
545 list_for_each_entry_safe(req
, tmp
, &target
->req_queue
, list
)
546 srp_reset_req(target
, req
);
547 spin_unlock_irq(target
->scsi_host
->host_lock
);
553 ret
= srp_connect_target(target
);
557 spin_lock_irq(target
->scsi_host
->host_lock
);
558 if (target
->state
== SRP_TARGET_CONNECTING
) {
560 target
->state
= SRP_TARGET_LIVE
;
563 spin_unlock_irq(target
->scsi_host
->host_lock
);
568 printk(KERN_ERR PFX
"reconnect failed (%d), removing target port.\n", ret
);
571 * We couldn't reconnect, so kill our target port off.
572 * However, we have to defer the real removal because we might
573 * be in the context of the SCSI error handler now, which
574 * would deadlock if we call scsi_remove_host().
576 spin_lock_irq(target
->scsi_host
->host_lock
);
577 if (target
->state
== SRP_TARGET_CONNECTING
) {
578 target
->state
= SRP_TARGET_DEAD
;
579 INIT_WORK(&target
->work
, srp_remove_work
);
580 schedule_work(&target
->work
);
582 spin_unlock_irq(target
->scsi_host
->host_lock
);
587 static int srp_map_fmr(struct srp_target_port
*target
, struct scatterlist
*scat
,
588 int sg_cnt
, struct srp_request
*req
,
589 struct srp_direct_buf
*buf
)
597 struct srp_device
*dev
= target
->srp_host
->dev
;
602 if ((sg_dma_address(&scat
[0]) & ~dev
->fmr_page_mask
) &&
603 mellanox_workarounds
&& !memcmp(&target
->ioc_guid
, mellanox_oui
, 3))
607 for (i
= 0; i
< sg_cnt
; ++i
) {
608 if (sg_dma_address(&scat
[i
]) & ~dev
->fmr_page_mask
) {
614 if ((sg_dma_address(&scat
[i
]) + sg_dma_len(&scat
[i
])) &
615 ~dev
->fmr_page_mask
) {
622 len
+= sg_dma_len(&scat
[i
]);
625 page_cnt
+= len
>> dev
->fmr_page_shift
;
626 if (page_cnt
> SRP_FMR_SIZE
)
629 dma_pages
= kmalloc(sizeof (u64
) * page_cnt
, GFP_ATOMIC
);
634 for (i
= 0; i
< sg_cnt
; ++i
)
635 for (j
= 0; j
< sg_dma_len(&scat
[i
]); j
+= dev
->fmr_page_size
)
636 dma_pages
[page_cnt
++] =
637 (sg_dma_address(&scat
[i
]) & dev
->fmr_page_mask
) + j
;
639 req
->fmr
= ib_fmr_pool_map_phys(dev
->fmr_pool
,
640 dma_pages
, page_cnt
, io_addr
);
641 if (IS_ERR(req
->fmr
)) {
642 ret
= PTR_ERR(req
->fmr
);
647 buf
->va
= cpu_to_be64(sg_dma_address(&scat
[0]) & ~dev
->fmr_page_mask
);
648 buf
->key
= cpu_to_be32(req
->fmr
->fmr
->rkey
);
649 buf
->len
= cpu_to_be32(len
);
659 static int srp_map_data(struct scsi_cmnd
*scmnd
, struct srp_target_port
*target
,
660 struct srp_request
*req
)
662 struct scatterlist
*scat
;
663 struct srp_cmd
*cmd
= req
->cmd
->buf
;
664 int len
, nents
, count
;
665 u8 fmt
= SRP_DATA_DESC_DIRECT
;
667 if (!scmnd
->request_buffer
|| scmnd
->sc_data_direction
== DMA_NONE
)
668 return sizeof (struct srp_cmd
);
670 if (scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
&&
671 scmnd
->sc_data_direction
!= DMA_TO_DEVICE
) {
672 printk(KERN_WARNING PFX
"Unhandled data direction %d\n",
673 scmnd
->sc_data_direction
);
678 * This handling of non-SG commands can be killed when the
679 * SCSI midlayer no longer generates non-SG commands.
681 if (likely(scmnd
->use_sg
)) {
682 nents
= scmnd
->use_sg
;
683 scat
= scmnd
->request_buffer
;
686 scat
= &req
->fake_sg
;
687 sg_init_one(scat
, scmnd
->request_buffer
, scmnd
->request_bufflen
);
690 count
= dma_map_sg(target
->srp_host
->dev
->dev
->dma_device
,
691 scat
, nents
, scmnd
->sc_data_direction
);
693 fmt
= SRP_DATA_DESC_DIRECT
;
694 len
= sizeof (struct srp_cmd
) + sizeof (struct srp_direct_buf
);
698 * The midlayer only generated a single gather/scatter
699 * entry, or DMA mapping coalesced everything to a
700 * single entry. So a direct descriptor along with
701 * the DMA MR suffices.
703 struct srp_direct_buf
*buf
= (void *) cmd
->add_data
;
705 buf
->va
= cpu_to_be64(sg_dma_address(scat
));
706 buf
->key
= cpu_to_be32(target
->srp_host
->dev
->mr
->rkey
);
707 buf
->len
= cpu_to_be32(sg_dma_len(scat
));
708 } else if (srp_map_fmr(target
, scat
, count
, req
,
709 (void *) cmd
->add_data
)) {
711 * FMR mapping failed, and the scatterlist has more
712 * than one entry. Generate an indirect memory
715 struct srp_indirect_buf
*buf
= (void *) cmd
->add_data
;
719 fmt
= SRP_DATA_DESC_INDIRECT
;
720 len
= sizeof (struct srp_cmd
) +
721 sizeof (struct srp_indirect_buf
) +
722 count
* sizeof (struct srp_direct_buf
);
724 for (i
= 0; i
< count
; ++i
) {
725 buf
->desc_list
[i
].va
=
726 cpu_to_be64(sg_dma_address(&scat
[i
]));
727 buf
->desc_list
[i
].key
=
728 cpu_to_be32(target
->srp_host
->dev
->mr
->rkey
);
729 buf
->desc_list
[i
].len
=
730 cpu_to_be32(sg_dma_len(&scat
[i
]));
731 datalen
+= sg_dma_len(&scat
[i
]);
734 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
735 cmd
->data_out_desc_cnt
= count
;
737 cmd
->data_in_desc_cnt
= count
;
740 cpu_to_be64(req
->cmd
->dma
+ sizeof *cmd
+ sizeof *buf
);
741 buf
->table_desc
.key
=
742 cpu_to_be32(target
->srp_host
->dev
->mr
->rkey
);
743 buf
->table_desc
.len
=
744 cpu_to_be32(count
* sizeof (struct srp_direct_buf
));
746 buf
->len
= cpu_to_be32(datalen
);
749 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
750 cmd
->buf_fmt
= fmt
<< 4;
757 static void srp_process_rsp(struct srp_target_port
*target
, struct srp_rsp
*rsp
)
759 struct srp_request
*req
;
760 struct scsi_cmnd
*scmnd
;
764 delta
= (s32
) be32_to_cpu(rsp
->req_lim_delta
);
766 spin_lock_irqsave(target
->scsi_host
->host_lock
, flags
);
768 target
->req_lim
+= delta
;
770 req
= &target
->req_ring
[rsp
->tag
& ~SRP_TAG_TSK_MGMT
];
772 if (unlikely(rsp
->tag
& SRP_TAG_TSK_MGMT
)) {
773 if (be32_to_cpu(rsp
->resp_data_len
) < 4)
774 req
->tsk_status
= -1;
776 req
->tsk_status
= rsp
->data
[3];
777 complete(&req
->done
);
781 printk(KERN_ERR
"Null scmnd for RSP w/tag %016llx\n",
782 (unsigned long long) rsp
->tag
);
783 scmnd
->result
= rsp
->status
;
785 if (rsp
->flags
& SRP_RSP_FLAG_SNSVALID
) {
786 memcpy(scmnd
->sense_buffer
, rsp
->data
+
787 be32_to_cpu(rsp
->resp_data_len
),
788 min_t(int, be32_to_cpu(rsp
->sense_data_len
),
789 SCSI_SENSE_BUFFERSIZE
));
792 if (rsp
->flags
& (SRP_RSP_FLAG_DOOVER
| SRP_RSP_FLAG_DOUNDER
))
793 scmnd
->resid
= be32_to_cpu(rsp
->data_out_res_cnt
);
794 else if (rsp
->flags
& (SRP_RSP_FLAG_DIOVER
| SRP_RSP_FLAG_DIUNDER
))
795 scmnd
->resid
= be32_to_cpu(rsp
->data_in_res_cnt
);
797 if (!req
->tsk_mgmt
) {
798 scmnd
->host_scribble
= (void *) -1L;
799 scmnd
->scsi_done(scmnd
);
801 srp_remove_req(target
, req
);
806 spin_unlock_irqrestore(target
->scsi_host
->host_lock
, flags
);
809 static void srp_handle_recv(struct srp_target_port
*target
, struct ib_wc
*wc
)
814 iu
= target
->rx_ring
[wc
->wr_id
& ~SRP_OP_RECV
];
816 dma_sync_single_for_cpu(target
->srp_host
->dev
->dev
->dma_device
, iu
->dma
,
817 target
->max_ti_iu_len
, DMA_FROM_DEVICE
);
819 opcode
= *(u8
*) iu
->buf
;
824 printk(KERN_ERR PFX
"recv completion, opcode 0x%02x\n", opcode
);
826 for (i
= 0; i
< wc
->byte_len
; ++i
) {
828 printk(KERN_ERR
" [%02x] ", i
);
829 printk(" %02x", ((u8
*) iu
->buf
)[i
]);
830 if ((i
+ 1) % 8 == 0)
834 if (wc
->byte_len
% 8)
840 srp_process_rsp(target
, iu
->buf
);
844 /* XXX Handle target logout */
845 printk(KERN_WARNING PFX
"Got target logout request\n");
849 printk(KERN_WARNING PFX
"Unhandled SRP opcode 0x%02x\n", opcode
);
853 dma_sync_single_for_device(target
->srp_host
->dev
->dev
->dma_device
, iu
->dma
,
854 target
->max_ti_iu_len
, DMA_FROM_DEVICE
);
857 static void srp_completion(struct ib_cq
*cq
, void *target_ptr
)
859 struct srp_target_port
*target
= target_ptr
;
862 ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
863 while (ib_poll_cq(cq
, 1, &wc
) > 0) {
865 printk(KERN_ERR PFX
"failed %s status %d\n",
866 wc
.wr_id
& SRP_OP_RECV
? "receive" : "send",
871 if (wc
.wr_id
& SRP_OP_RECV
)
872 srp_handle_recv(target
, &wc
);
878 static int __srp_post_recv(struct srp_target_port
*target
)
882 struct ib_recv_wr wr
, *bad_wr
;
886 next
= target
->rx_head
& (SRP_RQ_SIZE
- 1);
887 wr
.wr_id
= next
| SRP_OP_RECV
;
888 iu
= target
->rx_ring
[next
];
891 list
.length
= iu
->size
;
892 list
.lkey
= target
->srp_host
->dev
->mr
->lkey
;
898 ret
= ib_post_recv(target
->qp
, &wr
, &bad_wr
);
905 static int srp_post_recv(struct srp_target_port
*target
)
910 spin_lock_irqsave(target
->scsi_host
->host_lock
, flags
);
911 ret
= __srp_post_recv(target
);
912 spin_unlock_irqrestore(target
->scsi_host
->host_lock
, flags
);
918 * Must be called with target->scsi_host->host_lock held to protect
919 * req_lim and tx_head. Lock cannot be dropped between call here and
920 * call to __srp_post_send().
922 static struct srp_iu
*__srp_get_tx_iu(struct srp_target_port
*target
)
924 if (target
->tx_head
- target
->tx_tail
>= SRP_SQ_SIZE
)
927 if (unlikely(target
->req_lim
< 1))
928 ++target
->zero_req_lim
;
930 return target
->tx_ring
[target
->tx_head
& SRP_SQ_SIZE
];
934 * Must be called with target->scsi_host->host_lock held to protect
935 * req_lim and tx_head.
937 static int __srp_post_send(struct srp_target_port
*target
,
938 struct srp_iu
*iu
, int len
)
941 struct ib_send_wr wr
, *bad_wr
;
946 list
.lkey
= target
->srp_host
->dev
->mr
->lkey
;
949 wr
.wr_id
= target
->tx_head
& SRP_SQ_SIZE
;
952 wr
.opcode
= IB_WR_SEND
;
953 wr
.send_flags
= IB_SEND_SIGNALED
;
955 ret
= ib_post_send(target
->qp
, &wr
, &bad_wr
);
965 static int srp_queuecommand(struct scsi_cmnd
*scmnd
,
966 void (*done
)(struct scsi_cmnd
*))
968 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
969 struct srp_request
*req
;
974 if (target
->state
== SRP_TARGET_CONNECTING
)
977 if (target
->state
== SRP_TARGET_DEAD
||
978 target
->state
== SRP_TARGET_REMOVED
) {
979 scmnd
->result
= DID_BAD_TARGET
<< 16;
984 iu
= __srp_get_tx_iu(target
);
988 dma_sync_single_for_cpu(target
->srp_host
->dev
->dev
->dma_device
, iu
->dma
,
989 srp_max_iu_len
, DMA_TO_DEVICE
);
991 req
= list_entry(target
->free_reqs
.next
, struct srp_request
, list
);
993 scmnd
->scsi_done
= done
;
995 scmnd
->host_scribble
= (void *) (long) req
->index
;
998 memset(cmd
, 0, sizeof *cmd
);
1000 cmd
->opcode
= SRP_CMD
;
1001 cmd
->lun
= cpu_to_be64((u64
) scmnd
->device
->lun
<< 48);
1002 cmd
->tag
= req
->index
;
1003 memcpy(cmd
->cdb
, scmnd
->cmnd
, scmnd
->cmd_len
);
1008 req
->tsk_mgmt
= NULL
;
1010 len
= srp_map_data(scmnd
, target
, req
);
1012 printk(KERN_ERR PFX
"Failed to map data\n");
1016 if (__srp_post_recv(target
)) {
1017 printk(KERN_ERR PFX
"Recv failed\n");
1021 dma_sync_single_for_device(target
->srp_host
->dev
->dev
->dma_device
, iu
->dma
,
1022 srp_max_iu_len
, DMA_TO_DEVICE
);
1024 if (__srp_post_send(target
, iu
, len
)) {
1025 printk(KERN_ERR PFX
"Send failed\n");
1029 list_move_tail(&req
->list
, &target
->req_queue
);
1034 srp_unmap_data(scmnd
, target
, req
);
1037 return SCSI_MLQUEUE_HOST_BUSY
;
1040 static int srp_alloc_iu_bufs(struct srp_target_port
*target
)
1044 for (i
= 0; i
< SRP_RQ_SIZE
; ++i
) {
1045 target
->rx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
1046 target
->max_ti_iu_len
,
1047 GFP_KERNEL
, DMA_FROM_DEVICE
);
1048 if (!target
->rx_ring
[i
])
1052 for (i
= 0; i
< SRP_SQ_SIZE
+ 1; ++i
) {
1053 target
->tx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
1055 GFP_KERNEL
, DMA_TO_DEVICE
);
1056 if (!target
->tx_ring
[i
])
1063 for (i
= 0; i
< SRP_RQ_SIZE
; ++i
) {
1064 srp_free_iu(target
->srp_host
, target
->rx_ring
[i
]);
1065 target
->rx_ring
[i
] = NULL
;
1068 for (i
= 0; i
< SRP_SQ_SIZE
+ 1; ++i
) {
1069 srp_free_iu(target
->srp_host
, target
->tx_ring
[i
]);
1070 target
->tx_ring
[i
] = NULL
;
1076 static void srp_cm_rej_handler(struct ib_cm_id
*cm_id
,
1077 struct ib_cm_event
*event
,
1078 struct srp_target_port
*target
)
1080 struct ib_class_port_info
*cpi
;
1083 switch (event
->param
.rej_rcvd
.reason
) {
1084 case IB_CM_REJ_PORT_CM_REDIRECT
:
1085 cpi
= event
->param
.rej_rcvd
.ari
;
1086 target
->path
.dlid
= cpi
->redirect_lid
;
1087 target
->path
.pkey
= cpi
->redirect_pkey
;
1088 cm_id
->remote_cm_qpn
= be32_to_cpu(cpi
->redirect_qp
) & 0x00ffffff;
1089 memcpy(target
->path
.dgid
.raw
, cpi
->redirect_gid
, 16);
1091 target
->status
= target
->path
.dlid
?
1092 SRP_DLID_REDIRECT
: SRP_PORT_REDIRECT
;
1095 case IB_CM_REJ_PORT_REDIRECT
:
1096 if (topspin_workarounds
&&
1097 !memcmp(&target
->ioc_guid
, topspin_oui
, 3)) {
1099 * Topspin/Cisco SRP gateways incorrectly send
1100 * reject reason code 25 when they mean 24
1103 memcpy(target
->path
.dgid
.raw
,
1104 event
->param
.rej_rcvd
.ari
, 16);
1106 printk(KERN_DEBUG PFX
"Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1107 (unsigned long long) be64_to_cpu(target
->path
.dgid
.global
.subnet_prefix
),
1108 (unsigned long long) be64_to_cpu(target
->path
.dgid
.global
.interface_id
));
1110 target
->status
= SRP_PORT_REDIRECT
;
1112 printk(KERN_WARNING
" REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1113 target
->status
= -ECONNRESET
;
1117 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID
:
1118 printk(KERN_WARNING
" REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1119 target
->status
= -ECONNRESET
;
1122 case IB_CM_REJ_CONSUMER_DEFINED
:
1123 opcode
= *(u8
*) event
->private_data
;
1124 if (opcode
== SRP_LOGIN_REJ
) {
1125 struct srp_login_rej
*rej
= event
->private_data
;
1126 u32 reason
= be32_to_cpu(rej
->reason
);
1128 if (reason
== SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE
)
1129 printk(KERN_WARNING PFX
1130 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1132 printk(KERN_WARNING PFX
1133 "SRP LOGIN REJECTED, reason 0x%08x\n", reason
);
1135 printk(KERN_WARNING
" REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1136 " opcode 0x%02x\n", opcode
);
1137 target
->status
= -ECONNRESET
;
1141 printk(KERN_WARNING
" REJ reason 0x%x\n",
1142 event
->param
.rej_rcvd
.reason
);
1143 target
->status
= -ECONNRESET
;
1147 static int srp_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
1149 struct srp_target_port
*target
= cm_id
->context
;
1150 struct ib_qp_attr
*qp_attr
= NULL
;
1155 switch (event
->event
) {
1156 case IB_CM_REQ_ERROR
:
1157 printk(KERN_DEBUG PFX
"Sending CM REQ failed\n");
1159 target
->status
= -ECONNRESET
;
1162 case IB_CM_REP_RECEIVED
:
1164 opcode
= *(u8
*) event
->private_data
;
1166 if (opcode
== SRP_LOGIN_RSP
) {
1167 struct srp_login_rsp
*rsp
= event
->private_data
;
1169 target
->max_ti_iu_len
= be32_to_cpu(rsp
->max_ti_iu_len
);
1170 target
->req_lim
= be32_to_cpu(rsp
->req_lim_delta
);
1172 target
->scsi_host
->can_queue
= min(target
->req_lim
,
1173 target
->scsi_host
->can_queue
);
1175 printk(KERN_WARNING PFX
"Unhandled RSP opcode %#x\n", opcode
);
1176 target
->status
= -ECONNRESET
;
1180 target
->status
= srp_alloc_iu_bufs(target
);
1184 qp_attr
= kmalloc(sizeof *qp_attr
, GFP_KERNEL
);
1186 target
->status
= -ENOMEM
;
1190 qp_attr
->qp_state
= IB_QPS_RTR
;
1191 target
->status
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
1195 target
->status
= ib_modify_qp(target
->qp
, qp_attr
, attr_mask
);
1199 target
->status
= srp_post_recv(target
);
1203 qp_attr
->qp_state
= IB_QPS_RTS
;
1204 target
->status
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
1208 target
->status
= ib_modify_qp(target
->qp
, qp_attr
, attr_mask
);
1212 target
->status
= ib_send_cm_rtu(cm_id
, NULL
, 0);
1218 case IB_CM_REJ_RECEIVED
:
1219 printk(KERN_DEBUG PFX
"REJ received\n");
1222 srp_cm_rej_handler(cm_id
, event
, target
);
1225 case IB_CM_DREQ_RECEIVED
:
1226 printk(KERN_WARNING PFX
"DREQ received - connection closed\n");
1227 if (ib_send_cm_drep(cm_id
, NULL
, 0))
1228 printk(KERN_ERR PFX
"Sending CM DREP failed\n");
1231 case IB_CM_TIMEWAIT_EXIT
:
1232 printk(KERN_ERR PFX
"connection closed\n");
1238 case IB_CM_MRA_RECEIVED
:
1239 case IB_CM_DREQ_ERROR
:
1240 case IB_CM_DREP_RECEIVED
:
1244 printk(KERN_WARNING PFX
"Unhandled CM event %d\n", event
->event
);
1249 complete(&target
->done
);
1256 static int srp_send_tsk_mgmt(struct srp_target_port
*target
,
1257 struct srp_request
*req
, u8 func
)
1260 struct srp_tsk_mgmt
*tsk_mgmt
;
1262 spin_lock_irq(target
->scsi_host
->host_lock
);
1264 if (target
->state
== SRP_TARGET_DEAD
||
1265 target
->state
== SRP_TARGET_REMOVED
) {
1266 req
->scmnd
->result
= DID_BAD_TARGET
<< 16;
1270 init_completion(&req
->done
);
1272 iu
= __srp_get_tx_iu(target
);
1277 memset(tsk_mgmt
, 0, sizeof *tsk_mgmt
);
1279 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1280 tsk_mgmt
->lun
= cpu_to_be64((u64
) req
->scmnd
->device
->lun
<< 48);
1281 tsk_mgmt
->tag
= req
->index
| SRP_TAG_TSK_MGMT
;
1282 tsk_mgmt
->tsk_mgmt_func
= func
;
1283 tsk_mgmt
->task_tag
= req
->index
;
1285 if (__srp_post_send(target
, iu
, sizeof *tsk_mgmt
))
1290 spin_unlock_irq(target
->scsi_host
->host_lock
);
1292 if (!wait_for_completion_timeout(&req
->done
,
1293 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS
)))
1299 spin_unlock_irq(target
->scsi_host
->host_lock
);
1303 static int srp_find_req(struct srp_target_port
*target
,
1304 struct scsi_cmnd
*scmnd
,
1305 struct srp_request
**req
)
1307 if (scmnd
->host_scribble
== (void *) -1L)
1310 *req
= &target
->req_ring
[(long) scmnd
->host_scribble
];
1315 static int srp_abort(struct scsi_cmnd
*scmnd
)
1317 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
1318 struct srp_request
*req
;
1321 printk(KERN_ERR
"SRP abort called\n");
1323 if (srp_find_req(target
, scmnd
, &req
))
1325 if (srp_send_tsk_mgmt(target
, req
, SRP_TSK_ABORT_TASK
))
1328 spin_lock_irq(target
->scsi_host
->host_lock
);
1330 if (req
->cmd_done
) {
1331 srp_remove_req(target
, req
);
1332 scmnd
->scsi_done(scmnd
);
1333 } else if (!req
->tsk_status
) {
1334 srp_remove_req(target
, req
);
1335 scmnd
->result
= DID_ABORT
<< 16;
1339 spin_unlock_irq(target
->scsi_host
->host_lock
);
1344 static int srp_reset_device(struct scsi_cmnd
*scmnd
)
1346 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
1347 struct srp_request
*req
, *tmp
;
1349 printk(KERN_ERR
"SRP reset_device called\n");
1351 if (srp_find_req(target
, scmnd
, &req
))
1353 if (srp_send_tsk_mgmt(target
, req
, SRP_TSK_LUN_RESET
))
1355 if (req
->tsk_status
)
1358 spin_lock_irq(target
->scsi_host
->host_lock
);
1360 list_for_each_entry_safe(req
, tmp
, &target
->req_queue
, list
)
1361 if (req
->scmnd
->device
== scmnd
->device
)
1362 srp_reset_req(target
, req
);
1364 spin_unlock_irq(target
->scsi_host
->host_lock
);
1369 static int srp_reset_host(struct scsi_cmnd
*scmnd
)
1371 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
1374 printk(KERN_ERR PFX
"SRP reset_host called\n");
1376 if (!srp_reconnect_target(target
))
1382 static ssize_t
show_id_ext(struct class_device
*cdev
, char *buf
)
1384 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1386 if (target
->state
== SRP_TARGET_DEAD
||
1387 target
->state
== SRP_TARGET_REMOVED
)
1390 return sprintf(buf
, "0x%016llx\n",
1391 (unsigned long long) be64_to_cpu(target
->id_ext
));
1394 static ssize_t
show_ioc_guid(struct class_device
*cdev
, char *buf
)
1396 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1398 if (target
->state
== SRP_TARGET_DEAD
||
1399 target
->state
== SRP_TARGET_REMOVED
)
1402 return sprintf(buf
, "0x%016llx\n",
1403 (unsigned long long) be64_to_cpu(target
->ioc_guid
));
1406 static ssize_t
show_service_id(struct class_device
*cdev
, char *buf
)
1408 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1410 if (target
->state
== SRP_TARGET_DEAD
||
1411 target
->state
== SRP_TARGET_REMOVED
)
1414 return sprintf(buf
, "0x%016llx\n",
1415 (unsigned long long) be64_to_cpu(target
->service_id
));
1418 static ssize_t
show_pkey(struct class_device
*cdev
, char *buf
)
1420 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1422 if (target
->state
== SRP_TARGET_DEAD
||
1423 target
->state
== SRP_TARGET_REMOVED
)
1426 return sprintf(buf
, "0x%04x\n", be16_to_cpu(target
->path
.pkey
));
1429 static ssize_t
show_dgid(struct class_device
*cdev
, char *buf
)
1431 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1433 if (target
->state
== SRP_TARGET_DEAD
||
1434 target
->state
== SRP_TARGET_REMOVED
)
1437 return sprintf(buf
, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1438 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[0]),
1439 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[1]),
1440 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[2]),
1441 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[3]),
1442 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[4]),
1443 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[5]),
1444 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[6]),
1445 be16_to_cpu(((__be16
*) target
->path
.dgid
.raw
)[7]));
1448 static ssize_t
show_zero_req_lim(struct class_device
*cdev
, char *buf
)
1450 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1452 if (target
->state
== SRP_TARGET_DEAD
||
1453 target
->state
== SRP_TARGET_REMOVED
)
1456 return sprintf(buf
, "%d\n", target
->zero_req_lim
);
1459 static ssize_t
show_local_ib_port(struct class_device
*cdev
, char *buf
)
1461 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1463 return sprintf(buf
, "%d\n", target
->srp_host
->port
);
1466 static ssize_t
show_local_ib_device(struct class_device
*cdev
, char *buf
)
1468 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1470 return sprintf(buf
, "%s\n", target
->srp_host
->dev
->dev
->name
);
1473 static CLASS_DEVICE_ATTR(id_ext
, S_IRUGO
, show_id_ext
, NULL
);
1474 static CLASS_DEVICE_ATTR(ioc_guid
, S_IRUGO
, show_ioc_guid
, NULL
);
1475 static CLASS_DEVICE_ATTR(service_id
, S_IRUGO
, show_service_id
, NULL
);
1476 static CLASS_DEVICE_ATTR(pkey
, S_IRUGO
, show_pkey
, NULL
);
1477 static CLASS_DEVICE_ATTR(dgid
, S_IRUGO
, show_dgid
, NULL
);
1478 static CLASS_DEVICE_ATTR(zero_req_lim
, S_IRUGO
, show_zero_req_lim
, NULL
);
1479 static CLASS_DEVICE_ATTR(local_ib_port
, S_IRUGO
, show_local_ib_port
, NULL
);
1480 static CLASS_DEVICE_ATTR(local_ib_device
, S_IRUGO
, show_local_ib_device
, NULL
);
1482 static struct class_device_attribute
*srp_host_attrs
[] = {
1483 &class_device_attr_id_ext
,
1484 &class_device_attr_ioc_guid
,
1485 &class_device_attr_service_id
,
1486 &class_device_attr_pkey
,
1487 &class_device_attr_dgid
,
1488 &class_device_attr_zero_req_lim
,
1489 &class_device_attr_local_ib_port
,
1490 &class_device_attr_local_ib_device
,
1494 static struct scsi_host_template srp_template
= {
1495 .module
= THIS_MODULE
,
1497 .info
= srp_target_info
,
1498 .queuecommand
= srp_queuecommand
,
1499 .eh_abort_handler
= srp_abort
,
1500 .eh_device_reset_handler
= srp_reset_device
,
1501 .eh_host_reset_handler
= srp_reset_host
,
1502 .can_queue
= SRP_SQ_SIZE
,
1504 .cmd_per_lun
= SRP_SQ_SIZE
,
1505 .use_clustering
= ENABLE_CLUSTERING
,
1506 .shost_attrs
= srp_host_attrs
1509 static int srp_add_target(struct srp_host
*host
, struct srp_target_port
*target
)
1511 sprintf(target
->target_name
, "SRP.T10:%016llX",
1512 (unsigned long long) be64_to_cpu(target
->id_ext
));
1514 if (scsi_add_host(target
->scsi_host
, host
->dev
->dev
->dma_device
))
1517 spin_lock(&host
->target_lock
);
1518 list_add_tail(&target
->list
, &host
->target_list
);
1519 spin_unlock(&host
->target_lock
);
1521 target
->state
= SRP_TARGET_LIVE
;
1523 scsi_scan_target(&target
->scsi_host
->shost_gendev
,
1524 0, target
->scsi_id
, SCAN_WILD_CARD
, 0);
1529 static void srp_release_class_dev(struct class_device
*class_dev
)
1531 struct srp_host
*host
=
1532 container_of(class_dev
, struct srp_host
, class_dev
);
1534 complete(&host
->released
);
1537 static struct class srp_class
= {
1538 .name
= "infiniband_srp",
1539 .release
= srp_release_class_dev
1543 * Target ports are added by writing
1545 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1546 * pkey=<P_Key>,service_id=<service ID>
1548 * to the add_target sysfs attribute.
1552 SRP_OPT_ID_EXT
= 1 << 0,
1553 SRP_OPT_IOC_GUID
= 1 << 1,
1554 SRP_OPT_DGID
= 1 << 2,
1555 SRP_OPT_PKEY
= 1 << 3,
1556 SRP_OPT_SERVICE_ID
= 1 << 4,
1557 SRP_OPT_MAX_SECT
= 1 << 5,
1558 SRP_OPT_MAX_CMD_PER_LUN
= 1 << 6,
1559 SRP_OPT_IO_CLASS
= 1 << 7,
1560 SRP_OPT_INITIATOR_EXT
= 1 << 8,
1561 SRP_OPT_ALL
= (SRP_OPT_ID_EXT
|
1565 SRP_OPT_SERVICE_ID
),
1568 static match_table_t srp_opt_tokens
= {
1569 { SRP_OPT_ID_EXT
, "id_ext=%s" },
1570 { SRP_OPT_IOC_GUID
, "ioc_guid=%s" },
1571 { SRP_OPT_DGID
, "dgid=%s" },
1572 { SRP_OPT_PKEY
, "pkey=%x" },
1573 { SRP_OPT_SERVICE_ID
, "service_id=%s" },
1574 { SRP_OPT_MAX_SECT
, "max_sect=%d" },
1575 { SRP_OPT_MAX_CMD_PER_LUN
, "max_cmd_per_lun=%d" },
1576 { SRP_OPT_IO_CLASS
, "io_class=%x" },
1577 { SRP_OPT_INITIATOR_EXT
, "initiator_ext=%s" },
1578 { SRP_OPT_ERR
, NULL
}
1581 static int srp_parse_options(const char *buf
, struct srp_target_port
*target
)
1583 char *options
, *sep_opt
;
1586 substring_t args
[MAX_OPT_ARGS
];
1592 options
= kstrdup(buf
, GFP_KERNEL
);
1597 while ((p
= strsep(&sep_opt
, ",")) != NULL
) {
1601 token
= match_token(p
, srp_opt_tokens
, args
);
1605 case SRP_OPT_ID_EXT
:
1606 p
= match_strdup(args
);
1607 target
->id_ext
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1611 case SRP_OPT_IOC_GUID
:
1612 p
= match_strdup(args
);
1613 target
->ioc_guid
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1618 p
= match_strdup(args
);
1619 if (strlen(p
) != 32) {
1620 printk(KERN_WARNING PFX
"bad dest GID parameter '%s'\n", p
);
1625 for (i
= 0; i
< 16; ++i
) {
1626 strlcpy(dgid
, p
+ i
* 2, 3);
1627 target
->path
.dgid
.raw
[i
] = simple_strtoul(dgid
, NULL
, 16);
1633 if (match_hex(args
, &token
)) {
1634 printk(KERN_WARNING PFX
"bad P_Key parameter '%s'\n", p
);
1637 target
->path
.pkey
= cpu_to_be16(token
);
1640 case SRP_OPT_SERVICE_ID
:
1641 p
= match_strdup(args
);
1642 target
->service_id
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1646 case SRP_OPT_MAX_SECT
:
1647 if (match_int(args
, &token
)) {
1648 printk(KERN_WARNING PFX
"bad max sect parameter '%s'\n", p
);
1651 target
->scsi_host
->max_sectors
= token
;
1654 case SRP_OPT_MAX_CMD_PER_LUN
:
1655 if (match_int(args
, &token
)) {
1656 printk(KERN_WARNING PFX
"bad max cmd_per_lun parameter '%s'\n", p
);
1659 target
->scsi_host
->cmd_per_lun
= min(token
, SRP_SQ_SIZE
);
1662 case SRP_OPT_IO_CLASS
:
1663 if (match_hex(args
, &token
)) {
1664 printk(KERN_WARNING PFX
"bad IO class parameter '%s' \n", p
);
1667 if (token
!= SRP_REV10_IB_IO_CLASS
&&
1668 token
!= SRP_REV16A_IB_IO_CLASS
) {
1669 printk(KERN_WARNING PFX
"unknown IO class parameter value"
1670 " %x specified (use %x or %x).\n",
1671 token
, SRP_REV10_IB_IO_CLASS
, SRP_REV16A_IB_IO_CLASS
);
1674 target
->io_class
= token
;
1677 case SRP_OPT_INITIATOR_EXT
:
1678 p
= match_strdup(args
);
1679 target
->initiator_ext
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1684 printk(KERN_WARNING PFX
"unknown parameter or missing value "
1685 "'%s' in target creation request\n", p
);
1690 if ((opt_mask
& SRP_OPT_ALL
) == SRP_OPT_ALL
)
1693 for (i
= 0; i
< ARRAY_SIZE(srp_opt_tokens
); ++i
)
1694 if ((srp_opt_tokens
[i
].token
& SRP_OPT_ALL
) &&
1695 !(srp_opt_tokens
[i
].token
& opt_mask
))
1696 printk(KERN_WARNING PFX
"target creation request is "
1697 "missing parameter '%s'\n",
1698 srp_opt_tokens
[i
].pattern
);
1705 static ssize_t
srp_create_target(struct class_device
*class_dev
,
1706 const char *buf
, size_t count
)
1708 struct srp_host
*host
=
1709 container_of(class_dev
, struct srp_host
, class_dev
);
1710 struct Scsi_Host
*target_host
;
1711 struct srp_target_port
*target
;
1715 target_host
= scsi_host_alloc(&srp_template
,
1716 sizeof (struct srp_target_port
));
1720 target_host
->max_lun
= SRP_MAX_LUN
;
1722 target
= host_to_target(target_host
);
1724 target
->io_class
= SRP_REV16A_IB_IO_CLASS
;
1725 target
->scsi_host
= target_host
;
1726 target
->srp_host
= host
;
1728 INIT_LIST_HEAD(&target
->free_reqs
);
1729 INIT_LIST_HEAD(&target
->req_queue
);
1730 for (i
= 0; i
< SRP_SQ_SIZE
; ++i
) {
1731 target
->req_ring
[i
].index
= i
;
1732 list_add_tail(&target
->req_ring
[i
].list
, &target
->free_reqs
);
1735 ret
= srp_parse_options(buf
, target
);
1739 ib_get_cached_gid(host
->dev
->dev
, host
->port
, 0, &target
->path
.sgid
);
1741 printk(KERN_DEBUG PFX
"new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1742 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1743 (unsigned long long) be64_to_cpu(target
->id_ext
),
1744 (unsigned long long) be64_to_cpu(target
->ioc_guid
),
1745 be16_to_cpu(target
->path
.pkey
),
1746 (unsigned long long) be64_to_cpu(target
->service_id
),
1747 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[0]),
1748 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[2]),
1749 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[4]),
1750 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[6]),
1751 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[8]),
1752 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[10]),
1753 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[12]),
1754 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[14]));
1756 ret
= srp_create_target_ib(target
);
1760 target
->cm_id
= ib_create_cm_id(host
->dev
->dev
, srp_cm_handler
, target
);
1761 if (IS_ERR(target
->cm_id
)) {
1762 ret
= PTR_ERR(target
->cm_id
);
1766 ret
= srp_connect_target(target
);
1768 printk(KERN_ERR PFX
"Connection failed\n");
1772 ret
= srp_add_target(host
, target
);
1774 goto err_disconnect
;
1779 srp_disconnect_target(target
);
1782 ib_destroy_cm_id(target
->cm_id
);
1785 srp_free_target_ib(target
);
1788 scsi_host_put(target_host
);
1793 static CLASS_DEVICE_ATTR(add_target
, S_IWUSR
, NULL
, srp_create_target
);
1795 static ssize_t
show_ibdev(struct class_device
*class_dev
, char *buf
)
1797 struct srp_host
*host
=
1798 container_of(class_dev
, struct srp_host
, class_dev
);
1800 return sprintf(buf
, "%s\n", host
->dev
->dev
->name
);
1803 static CLASS_DEVICE_ATTR(ibdev
, S_IRUGO
, show_ibdev
, NULL
);
1805 static ssize_t
show_port(struct class_device
*class_dev
, char *buf
)
1807 struct srp_host
*host
=
1808 container_of(class_dev
, struct srp_host
, class_dev
);
1810 return sprintf(buf
, "%d\n", host
->port
);
1813 static CLASS_DEVICE_ATTR(port
, S_IRUGO
, show_port
, NULL
);
1815 static struct srp_host
*srp_add_port(struct srp_device
*device
, u8 port
)
1817 struct srp_host
*host
;
1819 host
= kzalloc(sizeof *host
, GFP_KERNEL
);
1823 INIT_LIST_HEAD(&host
->target_list
);
1824 spin_lock_init(&host
->target_lock
);
1825 init_completion(&host
->released
);
1829 host
->class_dev
.class = &srp_class
;
1830 host
->class_dev
.dev
= device
->dev
->dma_device
;
1831 snprintf(host
->class_dev
.class_id
, BUS_ID_SIZE
, "srp-%s-%d",
1832 device
->dev
->name
, port
);
1834 if (class_device_register(&host
->class_dev
))
1836 if (class_device_create_file(&host
->class_dev
, &class_device_attr_add_target
))
1838 if (class_device_create_file(&host
->class_dev
, &class_device_attr_ibdev
))
1840 if (class_device_create_file(&host
->class_dev
, &class_device_attr_port
))
1846 class_device_unregister(&host
->class_dev
);
1854 static void srp_add_one(struct ib_device
*device
)
1856 struct srp_device
*srp_dev
;
1857 struct ib_device_attr
*dev_attr
;
1858 struct ib_fmr_pool_param fmr_param
;
1859 struct srp_host
*host
;
1862 dev_attr
= kmalloc(sizeof *dev_attr
, GFP_KERNEL
);
1866 if (ib_query_device(device
, dev_attr
)) {
1867 printk(KERN_WARNING PFX
"Query device failed for %s\n",
1872 srp_dev
= kmalloc(sizeof *srp_dev
, GFP_KERNEL
);
1877 * Use the smallest page size supported by the HCA, down to a
1878 * minimum of 512 bytes (which is the smallest sector that a
1879 * SCSI command will ever carry).
1881 srp_dev
->fmr_page_shift
= max(9, ffs(dev_attr
->page_size_cap
) - 1);
1882 srp_dev
->fmr_page_size
= 1 << srp_dev
->fmr_page_shift
;
1883 srp_dev
->fmr_page_mask
= ~((unsigned long) srp_dev
->fmr_page_size
- 1);
1885 INIT_LIST_HEAD(&srp_dev
->dev_list
);
1887 srp_dev
->dev
= device
;
1888 srp_dev
->pd
= ib_alloc_pd(device
);
1889 if (IS_ERR(srp_dev
->pd
))
1892 srp_dev
->mr
= ib_get_dma_mr(srp_dev
->pd
,
1893 IB_ACCESS_LOCAL_WRITE
|
1894 IB_ACCESS_REMOTE_READ
|
1895 IB_ACCESS_REMOTE_WRITE
);
1896 if (IS_ERR(srp_dev
->mr
))
1899 memset(&fmr_param
, 0, sizeof fmr_param
);
1900 fmr_param
.pool_size
= SRP_FMR_POOL_SIZE
;
1901 fmr_param
.dirty_watermark
= SRP_FMR_DIRTY_SIZE
;
1902 fmr_param
.cache
= 1;
1903 fmr_param
.max_pages_per_fmr
= SRP_FMR_SIZE
;
1904 fmr_param
.page_shift
= srp_dev
->fmr_page_shift
;
1905 fmr_param
.access
= (IB_ACCESS_LOCAL_WRITE
|
1906 IB_ACCESS_REMOTE_WRITE
|
1907 IB_ACCESS_REMOTE_READ
);
1909 srp_dev
->fmr_pool
= ib_create_fmr_pool(srp_dev
->pd
, &fmr_param
);
1910 if (IS_ERR(srp_dev
->fmr_pool
))
1911 srp_dev
->fmr_pool
= NULL
;
1913 if (device
->node_type
== RDMA_NODE_IB_SWITCH
) {
1918 e
= device
->phys_port_cnt
;
1921 for (p
= s
; p
<= e
; ++p
) {
1922 host
= srp_add_port(srp_dev
, p
);
1924 list_add_tail(&host
->list
, &srp_dev
->dev_list
);
1927 ib_set_client_data(device
, &srp_client
, srp_dev
);
1932 ib_dealloc_pd(srp_dev
->pd
);
1941 static void srp_remove_one(struct ib_device
*device
)
1943 struct srp_device
*srp_dev
;
1944 struct srp_host
*host
, *tmp_host
;
1945 LIST_HEAD(target_list
);
1946 struct srp_target_port
*target
, *tmp_target
;
1948 srp_dev
= ib_get_client_data(device
, &srp_client
);
1950 list_for_each_entry_safe(host
, tmp_host
, &srp_dev
->dev_list
, list
) {
1951 class_device_unregister(&host
->class_dev
);
1953 * Wait for the sysfs entry to go away, so that no new
1954 * target ports can be created.
1956 wait_for_completion(&host
->released
);
1959 * Mark all target ports as removed, so we stop queueing
1960 * commands and don't try to reconnect.
1962 spin_lock(&host
->target_lock
);
1963 list_for_each_entry(target
, &host
->target_list
, list
) {
1964 spin_lock_irq(target
->scsi_host
->host_lock
);
1965 target
->state
= SRP_TARGET_REMOVED
;
1966 spin_unlock_irq(target
->scsi_host
->host_lock
);
1968 spin_unlock(&host
->target_lock
);
1971 * Wait for any reconnection tasks that may have
1972 * started before we marked our target ports as
1973 * removed, and any target port removal tasks.
1975 flush_scheduled_work();
1977 list_for_each_entry_safe(target
, tmp_target
,
1978 &host
->target_list
, list
) {
1979 scsi_remove_host(target
->scsi_host
);
1980 srp_disconnect_target(target
);
1981 ib_destroy_cm_id(target
->cm_id
);
1982 srp_free_target_ib(target
);
1983 scsi_host_put(target
->scsi_host
);
1989 if (srp_dev
->fmr_pool
)
1990 ib_destroy_fmr_pool(srp_dev
->fmr_pool
);
1991 ib_dereg_mr(srp_dev
->mr
);
1992 ib_dealloc_pd(srp_dev
->pd
);
1997 static int __init
srp_init_module(void)
2001 srp_template
.sg_tablesize
= srp_sg_tablesize
;
2002 srp_max_iu_len
= (sizeof (struct srp_cmd
) +
2003 sizeof (struct srp_indirect_buf
) +
2004 srp_sg_tablesize
* 16);
2006 ret
= class_register(&srp_class
);
2008 printk(KERN_ERR PFX
"couldn't register class infiniband_srp\n");
2012 ib_sa_register_client(&srp_sa_client
);
2014 ret
= ib_register_client(&srp_client
);
2016 printk(KERN_ERR PFX
"couldn't register IB client\n");
2017 ib_sa_unregister_client(&srp_sa_client
);
2018 class_unregister(&srp_class
);
2025 static void __exit
srp_cleanup_module(void)
2027 ib_unregister_client(&srp_client
);
2028 ib_sa_unregister_client(&srp_sa_client
);
2029 class_unregister(&srp_class
);
2032 module_init(srp_init_module
);
2033 module_exit(srp_cleanup_module
);