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
= ib_dma_map_single(host
->dev
->dev
, iu
->buf
, size
, direction
);
126 if (ib_dma_mapping_error(host
->dev
->dev
, iu
->dma
))
130 iu
->direction
= direction
;
142 static void srp_free_iu(struct srp_host
*host
, struct srp_iu
*iu
)
147 ib_dma_unmap_single(host
->dev
->dev
, iu
->dma
, iu
->size
, iu
->direction
);
152 static void srp_qp_event(struct ib_event
*event
, void *context
)
154 printk(KERN_ERR PFX
"QP event %d\n", event
->event
);
157 static int srp_init_qp(struct srp_target_port
*target
,
160 struct ib_qp_attr
*attr
;
163 attr
= kmalloc(sizeof *attr
, GFP_KERNEL
);
167 ret
= ib_find_cached_pkey(target
->srp_host
->dev
->dev
,
168 target
->srp_host
->port
,
169 be16_to_cpu(target
->path
.pkey
),
174 attr
->qp_state
= IB_QPS_INIT
;
175 attr
->qp_access_flags
= (IB_ACCESS_REMOTE_READ
|
176 IB_ACCESS_REMOTE_WRITE
);
177 attr
->port_num
= target
->srp_host
->port
;
179 ret
= ib_modify_qp(qp
, attr
,
190 static int srp_create_target_ib(struct srp_target_port
*target
)
192 struct ib_qp_init_attr
*init_attr
;
195 init_attr
= kzalloc(sizeof *init_attr
, GFP_KERNEL
);
199 target
->cq
= ib_create_cq(target
->srp_host
->dev
->dev
, srp_completion
,
200 NULL
, target
, SRP_CQ_SIZE
, 0);
201 if (IS_ERR(target
->cq
)) {
202 ret
= PTR_ERR(target
->cq
);
206 ib_req_notify_cq(target
->cq
, IB_CQ_NEXT_COMP
);
208 init_attr
->event_handler
= srp_qp_event
;
209 init_attr
->cap
.max_send_wr
= SRP_SQ_SIZE
;
210 init_attr
->cap
.max_recv_wr
= SRP_RQ_SIZE
;
211 init_attr
->cap
.max_recv_sge
= 1;
212 init_attr
->cap
.max_send_sge
= 1;
213 init_attr
->sq_sig_type
= IB_SIGNAL_ALL_WR
;
214 init_attr
->qp_type
= IB_QPT_RC
;
215 init_attr
->send_cq
= target
->cq
;
216 init_attr
->recv_cq
= target
->cq
;
218 target
->qp
= ib_create_qp(target
->srp_host
->dev
->pd
, init_attr
);
219 if (IS_ERR(target
->qp
)) {
220 ret
= PTR_ERR(target
->qp
);
221 ib_destroy_cq(target
->cq
);
225 ret
= srp_init_qp(target
, target
->qp
);
227 ib_destroy_qp(target
->qp
);
228 ib_destroy_cq(target
->cq
);
237 static void srp_free_target_ib(struct srp_target_port
*target
)
241 ib_destroy_qp(target
->qp
);
242 ib_destroy_cq(target
->cq
);
244 for (i
= 0; i
< SRP_RQ_SIZE
; ++i
)
245 srp_free_iu(target
->srp_host
, target
->rx_ring
[i
]);
246 for (i
= 0; i
< SRP_SQ_SIZE
+ 1; ++i
)
247 srp_free_iu(target
->srp_host
, target
->tx_ring
[i
]);
250 static void srp_path_rec_completion(int status
,
251 struct ib_sa_path_rec
*pathrec
,
254 struct srp_target_port
*target
= target_ptr
;
256 target
->status
= status
;
258 printk(KERN_ERR PFX
"Got failed path rec status %d\n", status
);
260 target
->path
= *pathrec
;
261 complete(&target
->done
);
264 static int srp_lookup_path(struct srp_target_port
*target
)
266 target
->path
.numb_path
= 1;
268 init_completion(&target
->done
);
270 target
->path_query_id
= ib_sa_path_rec_get(&srp_sa_client
,
271 target
->srp_host
->dev
->dev
,
272 target
->srp_host
->port
,
274 IB_SA_PATH_REC_DGID
|
275 IB_SA_PATH_REC_SGID
|
276 IB_SA_PATH_REC_NUMB_PATH
|
278 SRP_PATH_REC_TIMEOUT_MS
,
280 srp_path_rec_completion
,
281 target
, &target
->path_query
);
282 if (target
->path_query_id
< 0)
283 return target
->path_query_id
;
285 wait_for_completion(&target
->done
);
287 if (target
->status
< 0)
288 printk(KERN_WARNING PFX
"Path record query failed\n");
290 return target
->status
;
293 static int srp_send_req(struct srp_target_port
*target
)
296 struct ib_cm_req_param param
;
297 struct srp_login_req priv
;
301 req
= kzalloc(sizeof *req
, GFP_KERNEL
);
305 req
->param
.primary_path
= &target
->path
;
306 req
->param
.alternate_path
= NULL
;
307 req
->param
.service_id
= target
->service_id
;
308 req
->param
.qp_num
= target
->qp
->qp_num
;
309 req
->param
.qp_type
= target
->qp
->qp_type
;
310 req
->param
.private_data
= &req
->priv
;
311 req
->param
.private_data_len
= sizeof req
->priv
;
312 req
->param
.flow_control
= 1;
314 get_random_bytes(&req
->param
.starting_psn
, 4);
315 req
->param
.starting_psn
&= 0xffffff;
318 * Pick some arbitrary defaults here; we could make these
319 * module parameters if anyone cared about setting them.
321 req
->param
.responder_resources
= 4;
322 req
->param
.remote_cm_response_timeout
= 20;
323 req
->param
.local_cm_response_timeout
= 20;
324 req
->param
.retry_count
= 7;
325 req
->param
.rnr_retry_count
= 7;
326 req
->param
.max_cm_retries
= 15;
328 req
->priv
.opcode
= SRP_LOGIN_REQ
;
330 req
->priv
.req_it_iu_len
= cpu_to_be32(srp_max_iu_len
);
331 req
->priv
.req_buf_fmt
= cpu_to_be16(SRP_BUF_FORMAT_DIRECT
|
332 SRP_BUF_FORMAT_INDIRECT
);
334 * In the published SRP specification (draft rev. 16a), the
335 * port identifier format is 8 bytes of ID extension followed
336 * by 8 bytes of GUID. Older drafts put the two halves in the
337 * opposite order, so that the GUID comes first.
339 * Targets conforming to these obsolete drafts can be
340 * recognized by the I/O Class they report.
342 if (target
->io_class
== SRP_REV10_IB_IO_CLASS
) {
343 memcpy(req
->priv
.initiator_port_id
,
344 &target
->path
.sgid
.global
.interface_id
, 8);
345 memcpy(req
->priv
.initiator_port_id
+ 8,
346 &target
->initiator_ext
, 8);
347 memcpy(req
->priv
.target_port_id
, &target
->ioc_guid
, 8);
348 memcpy(req
->priv
.target_port_id
+ 8, &target
->id_ext
, 8);
350 memcpy(req
->priv
.initiator_port_id
,
351 &target
->initiator_ext
, 8);
352 memcpy(req
->priv
.initiator_port_id
+ 8,
353 &target
->path
.sgid
.global
.interface_id
, 8);
354 memcpy(req
->priv
.target_port_id
, &target
->id_ext
, 8);
355 memcpy(req
->priv
.target_port_id
+ 8, &target
->ioc_guid
, 8);
359 * Topspin/Cisco SRP targets will reject our login unless we
360 * zero out the first 8 bytes of our initiator port ID and set
361 * the second 8 bytes to the local node GUID.
363 if (topspin_workarounds
&& !memcmp(&target
->ioc_guid
, topspin_oui
, 3)) {
364 printk(KERN_DEBUG PFX
"Topspin/Cisco initiator port ID workaround "
365 "activated for target GUID %016llx\n",
366 (unsigned long long) be64_to_cpu(target
->ioc_guid
));
367 memset(req
->priv
.initiator_port_id
, 0, 8);
368 memcpy(req
->priv
.initiator_port_id
+ 8,
369 &target
->srp_host
->dev
->dev
->node_guid
, 8);
372 status
= ib_send_cm_req(target
->cm_id
, &req
->param
);
379 static void srp_disconnect_target(struct srp_target_port
*target
)
381 /* XXX should send SRP_I_LOGOUT request */
383 init_completion(&target
->done
);
384 if (ib_send_cm_dreq(target
->cm_id
, NULL
, 0)) {
385 printk(KERN_DEBUG PFX
"Sending CM DREQ failed\n");
388 wait_for_completion(&target
->done
);
391 static void srp_remove_work(struct work_struct
*work
)
393 struct srp_target_port
*target
=
394 container_of(work
, struct srp_target_port
, work
);
396 spin_lock_irq(target
->scsi_host
->host_lock
);
397 if (target
->state
!= SRP_TARGET_DEAD
) {
398 spin_unlock_irq(target
->scsi_host
->host_lock
);
401 target
->state
= SRP_TARGET_REMOVED
;
402 spin_unlock_irq(target
->scsi_host
->host_lock
);
404 spin_lock(&target
->srp_host
->target_lock
);
405 list_del(&target
->list
);
406 spin_unlock(&target
->srp_host
->target_lock
);
408 scsi_remove_host(target
->scsi_host
);
409 ib_destroy_cm_id(target
->cm_id
);
410 srp_free_target_ib(target
);
411 scsi_host_put(target
->scsi_host
);
414 static int srp_connect_target(struct srp_target_port
*target
)
418 ret
= srp_lookup_path(target
);
423 init_completion(&target
->done
);
424 ret
= srp_send_req(target
);
427 wait_for_completion(&target
->done
);
430 * The CM event handling code will set status to
431 * SRP_PORT_REDIRECT if we get a port redirect REJ
432 * back, or SRP_DLID_REDIRECT if we get a lid/qp
435 switch (target
->status
) {
439 case SRP_PORT_REDIRECT
:
440 ret
= srp_lookup_path(target
);
445 case SRP_DLID_REDIRECT
:
449 return target
->status
;
454 static void srp_unmap_data(struct scsi_cmnd
*scmnd
,
455 struct srp_target_port
*target
,
456 struct srp_request
*req
)
458 if (!scsi_sglist(scmnd
) ||
459 (scmnd
->sc_data_direction
!= DMA_TO_DEVICE
&&
460 scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
))
464 ib_fmr_pool_unmap(req
->fmr
);
468 ib_dma_unmap_sg(target
->srp_host
->dev
->dev
, scsi_sglist(scmnd
),
469 scsi_sg_count(scmnd
), scmnd
->sc_data_direction
);
472 static void srp_remove_req(struct srp_target_port
*target
, struct srp_request
*req
)
474 srp_unmap_data(req
->scmnd
, target
, req
);
475 list_move_tail(&req
->list
, &target
->free_reqs
);
478 static void srp_reset_req(struct srp_target_port
*target
, struct srp_request
*req
)
480 req
->scmnd
->result
= DID_RESET
<< 16;
481 req
->scmnd
->scsi_done(req
->scmnd
);
482 srp_remove_req(target
, req
);
485 static int srp_reconnect_target(struct srp_target_port
*target
)
487 struct ib_cm_id
*new_cm_id
;
488 struct ib_qp_attr qp_attr
;
489 struct srp_request
*req
, *tmp
;
493 spin_lock_irq(target
->scsi_host
->host_lock
);
494 if (target
->state
!= SRP_TARGET_LIVE
) {
495 spin_unlock_irq(target
->scsi_host
->host_lock
);
498 target
->state
= SRP_TARGET_CONNECTING
;
499 spin_unlock_irq(target
->scsi_host
->host_lock
);
501 srp_disconnect_target(target
);
503 * Now get a new local CM ID so that we avoid confusing the
504 * target in case things are really fouled up.
506 new_cm_id
= ib_create_cm_id(target
->srp_host
->dev
->dev
,
507 srp_cm_handler
, target
);
508 if (IS_ERR(new_cm_id
)) {
509 ret
= PTR_ERR(new_cm_id
);
512 ib_destroy_cm_id(target
->cm_id
);
513 target
->cm_id
= new_cm_id
;
515 qp_attr
.qp_state
= IB_QPS_RESET
;
516 ret
= ib_modify_qp(target
->qp
, &qp_attr
, IB_QP_STATE
);
520 ret
= srp_init_qp(target
, target
->qp
);
524 while (ib_poll_cq(target
->cq
, 1, &wc
) > 0)
527 spin_lock_irq(target
->scsi_host
->host_lock
);
528 list_for_each_entry_safe(req
, tmp
, &target
->req_queue
, list
)
529 srp_reset_req(target
, req
);
530 spin_unlock_irq(target
->scsi_host
->host_lock
);
536 target
->qp_in_error
= 0;
537 ret
= srp_connect_target(target
);
541 spin_lock_irq(target
->scsi_host
->host_lock
);
542 if (target
->state
== SRP_TARGET_CONNECTING
) {
544 target
->state
= SRP_TARGET_LIVE
;
547 spin_unlock_irq(target
->scsi_host
->host_lock
);
552 printk(KERN_ERR PFX
"reconnect failed (%d), removing target port.\n", ret
);
555 * We couldn't reconnect, so kill our target port off.
556 * However, we have to defer the real removal because we might
557 * be in the context of the SCSI error handler now, which
558 * would deadlock if we call scsi_remove_host().
560 spin_lock_irq(target
->scsi_host
->host_lock
);
561 if (target
->state
== SRP_TARGET_CONNECTING
) {
562 target
->state
= SRP_TARGET_DEAD
;
563 INIT_WORK(&target
->work
, srp_remove_work
);
564 schedule_work(&target
->work
);
566 spin_unlock_irq(target
->scsi_host
->host_lock
);
571 static int srp_map_fmr(struct srp_target_port
*target
, struct scatterlist
*scat
,
572 int sg_cnt
, struct srp_request
*req
,
573 struct srp_direct_buf
*buf
)
581 struct srp_device
*dev
= target
->srp_host
->dev
;
582 struct ib_device
*ibdev
= dev
->dev
;
583 struct scatterlist
*sg
;
588 if ((ib_sg_dma_address(ibdev
, &scat
[0]) & ~dev
->fmr_page_mask
) &&
589 mellanox_workarounds
&& !memcmp(&target
->ioc_guid
, mellanox_oui
, 3))
593 scsi_for_each_sg(req
->scmnd
, sg
, sg_cnt
, i
) {
594 unsigned int dma_len
= ib_sg_dma_len(ibdev
, sg
);
596 if (ib_sg_dma_address(ibdev
, sg
) & ~dev
->fmr_page_mask
) {
602 if ((ib_sg_dma_address(ibdev
, sg
) + dma_len
) &
603 ~dev
->fmr_page_mask
) {
613 page_cnt
+= len
>> dev
->fmr_page_shift
;
614 if (page_cnt
> SRP_FMR_SIZE
)
617 dma_pages
= kmalloc(sizeof (u64
) * page_cnt
, GFP_ATOMIC
);
622 scsi_for_each_sg(req
->scmnd
, sg
, sg_cnt
, i
) {
623 unsigned int dma_len
= ib_sg_dma_len(ibdev
, sg
);
625 for (j
= 0; j
< dma_len
; j
+= dev
->fmr_page_size
)
626 dma_pages
[page_cnt
++] =
627 (ib_sg_dma_address(ibdev
, sg
) &
628 dev
->fmr_page_mask
) + j
;
631 req
->fmr
= ib_fmr_pool_map_phys(dev
->fmr_pool
,
632 dma_pages
, page_cnt
, io_addr
);
633 if (IS_ERR(req
->fmr
)) {
634 ret
= PTR_ERR(req
->fmr
);
639 buf
->va
= cpu_to_be64(ib_sg_dma_address(ibdev
, &scat
[0]) &
640 ~dev
->fmr_page_mask
);
641 buf
->key
= cpu_to_be32(req
->fmr
->fmr
->rkey
);
642 buf
->len
= cpu_to_be32(len
);
652 static int srp_map_data(struct scsi_cmnd
*scmnd
, struct srp_target_port
*target
,
653 struct srp_request
*req
)
655 struct scatterlist
*scat
;
656 struct srp_cmd
*cmd
= req
->cmd
->buf
;
657 int len
, nents
, count
;
658 u8 fmt
= SRP_DATA_DESC_DIRECT
;
659 struct srp_device
*dev
;
660 struct ib_device
*ibdev
;
662 if (!scsi_sglist(scmnd
) || scmnd
->sc_data_direction
== DMA_NONE
)
663 return sizeof (struct srp_cmd
);
665 if (scmnd
->sc_data_direction
!= DMA_FROM_DEVICE
&&
666 scmnd
->sc_data_direction
!= DMA_TO_DEVICE
) {
667 printk(KERN_WARNING PFX
"Unhandled data direction %d\n",
668 scmnd
->sc_data_direction
);
672 nents
= scsi_sg_count(scmnd
);
673 scat
= scsi_sglist(scmnd
);
675 dev
= target
->srp_host
->dev
;
678 count
= ib_dma_map_sg(ibdev
, scat
, nents
, scmnd
->sc_data_direction
);
680 fmt
= SRP_DATA_DESC_DIRECT
;
681 len
= sizeof (struct srp_cmd
) + sizeof (struct srp_direct_buf
);
685 * The midlayer only generated a single gather/scatter
686 * entry, or DMA mapping coalesced everything to a
687 * single entry. So a direct descriptor along with
688 * the DMA MR suffices.
690 struct srp_direct_buf
*buf
= (void *) cmd
->add_data
;
692 buf
->va
= cpu_to_be64(ib_sg_dma_address(ibdev
, scat
));
693 buf
->key
= cpu_to_be32(dev
->mr
->rkey
);
694 buf
->len
= cpu_to_be32(ib_sg_dma_len(ibdev
, scat
));
695 } else if (srp_map_fmr(target
, scat
, count
, req
,
696 (void *) cmd
->add_data
)) {
698 * FMR mapping failed, and the scatterlist has more
699 * than one entry. Generate an indirect memory
702 struct srp_indirect_buf
*buf
= (void *) cmd
->add_data
;
703 struct scatterlist
*sg
;
707 fmt
= SRP_DATA_DESC_INDIRECT
;
708 len
= sizeof (struct srp_cmd
) +
709 sizeof (struct srp_indirect_buf
) +
710 count
* sizeof (struct srp_direct_buf
);
712 scsi_for_each_sg(scmnd
, sg
, count
, i
) {
713 unsigned int dma_len
= ib_sg_dma_len(ibdev
, sg
);
715 buf
->desc_list
[i
].va
=
716 cpu_to_be64(ib_sg_dma_address(ibdev
, sg
));
717 buf
->desc_list
[i
].key
=
718 cpu_to_be32(dev
->mr
->rkey
);
719 buf
->desc_list
[i
].len
= cpu_to_be32(dma_len
);
723 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
724 cmd
->data_out_desc_cnt
= count
;
726 cmd
->data_in_desc_cnt
= count
;
729 cpu_to_be64(req
->cmd
->dma
+ sizeof *cmd
+ sizeof *buf
);
730 buf
->table_desc
.key
=
731 cpu_to_be32(target
->srp_host
->dev
->mr
->rkey
);
732 buf
->table_desc
.len
=
733 cpu_to_be32(count
* sizeof (struct srp_direct_buf
));
735 buf
->len
= cpu_to_be32(datalen
);
738 if (scmnd
->sc_data_direction
== DMA_TO_DEVICE
)
739 cmd
->buf_fmt
= fmt
<< 4;
746 static void srp_process_rsp(struct srp_target_port
*target
, struct srp_rsp
*rsp
)
748 struct srp_request
*req
;
749 struct scsi_cmnd
*scmnd
;
753 delta
= (s32
) be32_to_cpu(rsp
->req_lim_delta
);
755 spin_lock_irqsave(target
->scsi_host
->host_lock
, flags
);
757 target
->req_lim
+= delta
;
759 req
= &target
->req_ring
[rsp
->tag
& ~SRP_TAG_TSK_MGMT
];
761 if (unlikely(rsp
->tag
& SRP_TAG_TSK_MGMT
)) {
762 if (be32_to_cpu(rsp
->resp_data_len
) < 4)
763 req
->tsk_status
= -1;
765 req
->tsk_status
= rsp
->data
[3];
766 complete(&req
->done
);
770 printk(KERN_ERR
"Null scmnd for RSP w/tag %016llx\n",
771 (unsigned long long) rsp
->tag
);
772 scmnd
->result
= rsp
->status
;
774 if (rsp
->flags
& SRP_RSP_FLAG_SNSVALID
) {
775 memcpy(scmnd
->sense_buffer
, rsp
->data
+
776 be32_to_cpu(rsp
->resp_data_len
),
777 min_t(int, be32_to_cpu(rsp
->sense_data_len
),
778 SCSI_SENSE_BUFFERSIZE
));
781 if (rsp
->flags
& (SRP_RSP_FLAG_DOOVER
| SRP_RSP_FLAG_DOUNDER
))
782 scsi_set_resid(scmnd
, be32_to_cpu(rsp
->data_out_res_cnt
));
783 else if (rsp
->flags
& (SRP_RSP_FLAG_DIOVER
| SRP_RSP_FLAG_DIUNDER
))
784 scsi_set_resid(scmnd
, be32_to_cpu(rsp
->data_in_res_cnt
));
786 if (!req
->tsk_mgmt
) {
787 scmnd
->host_scribble
= (void *) -1L;
788 scmnd
->scsi_done(scmnd
);
790 srp_remove_req(target
, req
);
795 spin_unlock_irqrestore(target
->scsi_host
->host_lock
, flags
);
798 static void srp_handle_recv(struct srp_target_port
*target
, struct ib_wc
*wc
)
800 struct ib_device
*dev
;
804 iu
= target
->rx_ring
[wc
->wr_id
& ~SRP_OP_RECV
];
806 dev
= target
->srp_host
->dev
->dev
;
807 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, target
->max_ti_iu_len
,
810 opcode
= *(u8
*) iu
->buf
;
815 printk(KERN_ERR PFX
"recv completion, opcode 0x%02x\n", opcode
);
817 for (i
= 0; i
< wc
->byte_len
; ++i
) {
819 printk(KERN_ERR
" [%02x] ", i
);
820 printk(" %02x", ((u8
*) iu
->buf
)[i
]);
821 if ((i
+ 1) % 8 == 0)
825 if (wc
->byte_len
% 8)
831 srp_process_rsp(target
, iu
->buf
);
835 /* XXX Handle target logout */
836 printk(KERN_WARNING PFX
"Got target logout request\n");
840 printk(KERN_WARNING PFX
"Unhandled SRP opcode 0x%02x\n", opcode
);
844 ib_dma_sync_single_for_device(dev
, iu
->dma
, target
->max_ti_iu_len
,
848 static void srp_completion(struct ib_cq
*cq
, void *target_ptr
)
850 struct srp_target_port
*target
= target_ptr
;
853 ib_req_notify_cq(cq
, IB_CQ_NEXT_COMP
);
854 while (ib_poll_cq(cq
, 1, &wc
) > 0) {
856 printk(KERN_ERR PFX
"failed %s status %d\n",
857 wc
.wr_id
& SRP_OP_RECV
? "receive" : "send",
859 target
->qp_in_error
= 1;
863 if (wc
.wr_id
& SRP_OP_RECV
)
864 srp_handle_recv(target
, &wc
);
870 static int __srp_post_recv(struct srp_target_port
*target
)
874 struct ib_recv_wr wr
, *bad_wr
;
878 next
= target
->rx_head
& (SRP_RQ_SIZE
- 1);
879 wr
.wr_id
= next
| SRP_OP_RECV
;
880 iu
= target
->rx_ring
[next
];
883 list
.length
= iu
->size
;
884 list
.lkey
= target
->srp_host
->dev
->mr
->lkey
;
890 ret
= ib_post_recv(target
->qp
, &wr
, &bad_wr
);
897 static int srp_post_recv(struct srp_target_port
*target
)
902 spin_lock_irqsave(target
->scsi_host
->host_lock
, flags
);
903 ret
= __srp_post_recv(target
);
904 spin_unlock_irqrestore(target
->scsi_host
->host_lock
, flags
);
910 * Must be called with target->scsi_host->host_lock held to protect
911 * req_lim and tx_head. Lock cannot be dropped between call here and
912 * call to __srp_post_send().
914 static struct srp_iu
*__srp_get_tx_iu(struct srp_target_port
*target
)
916 if (target
->tx_head
- target
->tx_tail
>= SRP_SQ_SIZE
)
919 if (unlikely(target
->req_lim
< 1))
920 ++target
->zero_req_lim
;
922 return target
->tx_ring
[target
->tx_head
& SRP_SQ_SIZE
];
926 * Must be called with target->scsi_host->host_lock held to protect
927 * req_lim and tx_head.
929 static int __srp_post_send(struct srp_target_port
*target
,
930 struct srp_iu
*iu
, int len
)
933 struct ib_send_wr wr
, *bad_wr
;
938 list
.lkey
= target
->srp_host
->dev
->mr
->lkey
;
941 wr
.wr_id
= target
->tx_head
& SRP_SQ_SIZE
;
944 wr
.opcode
= IB_WR_SEND
;
945 wr
.send_flags
= IB_SEND_SIGNALED
;
947 ret
= ib_post_send(target
->qp
, &wr
, &bad_wr
);
957 static int srp_queuecommand(struct scsi_cmnd
*scmnd
,
958 void (*done
)(struct scsi_cmnd
*))
960 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
961 struct srp_request
*req
;
964 struct ib_device
*dev
;
967 if (target
->state
== SRP_TARGET_CONNECTING
)
970 if (target
->state
== SRP_TARGET_DEAD
||
971 target
->state
== SRP_TARGET_REMOVED
) {
972 scmnd
->result
= DID_BAD_TARGET
<< 16;
977 iu
= __srp_get_tx_iu(target
);
981 dev
= target
->srp_host
->dev
->dev
;
982 ib_dma_sync_single_for_cpu(dev
, iu
->dma
, srp_max_iu_len
,
985 req
= list_entry(target
->free_reqs
.next
, struct srp_request
, list
);
987 scmnd
->scsi_done
= done
;
989 scmnd
->host_scribble
= (void *) (long) req
->index
;
992 memset(cmd
, 0, sizeof *cmd
);
994 cmd
->opcode
= SRP_CMD
;
995 cmd
->lun
= cpu_to_be64((u64
) scmnd
->device
->lun
<< 48);
996 cmd
->tag
= req
->index
;
997 memcpy(cmd
->cdb
, scmnd
->cmnd
, scmnd
->cmd_len
);
1002 req
->tsk_mgmt
= NULL
;
1004 len
= srp_map_data(scmnd
, target
, req
);
1006 printk(KERN_ERR PFX
"Failed to map data\n");
1010 if (__srp_post_recv(target
)) {
1011 printk(KERN_ERR PFX
"Recv failed\n");
1015 ib_dma_sync_single_for_device(dev
, iu
->dma
, srp_max_iu_len
,
1018 if (__srp_post_send(target
, iu
, len
)) {
1019 printk(KERN_ERR PFX
"Send failed\n");
1023 list_move_tail(&req
->list
, &target
->req_queue
);
1028 srp_unmap_data(scmnd
, target
, req
);
1031 return SCSI_MLQUEUE_HOST_BUSY
;
1034 static int srp_alloc_iu_bufs(struct srp_target_port
*target
)
1038 for (i
= 0; i
< SRP_RQ_SIZE
; ++i
) {
1039 target
->rx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
1040 target
->max_ti_iu_len
,
1041 GFP_KERNEL
, DMA_FROM_DEVICE
);
1042 if (!target
->rx_ring
[i
])
1046 for (i
= 0; i
< SRP_SQ_SIZE
+ 1; ++i
) {
1047 target
->tx_ring
[i
] = srp_alloc_iu(target
->srp_host
,
1049 GFP_KERNEL
, DMA_TO_DEVICE
);
1050 if (!target
->tx_ring
[i
])
1057 for (i
= 0; i
< SRP_RQ_SIZE
; ++i
) {
1058 srp_free_iu(target
->srp_host
, target
->rx_ring
[i
]);
1059 target
->rx_ring
[i
] = NULL
;
1062 for (i
= 0; i
< SRP_SQ_SIZE
+ 1; ++i
) {
1063 srp_free_iu(target
->srp_host
, target
->tx_ring
[i
]);
1064 target
->tx_ring
[i
] = NULL
;
1070 static void srp_cm_rej_handler(struct ib_cm_id
*cm_id
,
1071 struct ib_cm_event
*event
,
1072 struct srp_target_port
*target
)
1074 struct ib_class_port_info
*cpi
;
1077 switch (event
->param
.rej_rcvd
.reason
) {
1078 case IB_CM_REJ_PORT_CM_REDIRECT
:
1079 cpi
= event
->param
.rej_rcvd
.ari
;
1080 target
->path
.dlid
= cpi
->redirect_lid
;
1081 target
->path
.pkey
= cpi
->redirect_pkey
;
1082 cm_id
->remote_cm_qpn
= be32_to_cpu(cpi
->redirect_qp
) & 0x00ffffff;
1083 memcpy(target
->path
.dgid
.raw
, cpi
->redirect_gid
, 16);
1085 target
->status
= target
->path
.dlid
?
1086 SRP_DLID_REDIRECT
: SRP_PORT_REDIRECT
;
1089 case IB_CM_REJ_PORT_REDIRECT
:
1090 if (topspin_workarounds
&&
1091 !memcmp(&target
->ioc_guid
, topspin_oui
, 3)) {
1093 * Topspin/Cisco SRP gateways incorrectly send
1094 * reject reason code 25 when they mean 24
1097 memcpy(target
->path
.dgid
.raw
,
1098 event
->param
.rej_rcvd
.ari
, 16);
1100 printk(KERN_DEBUG PFX
"Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1101 (unsigned long long) be64_to_cpu(target
->path
.dgid
.global
.subnet_prefix
),
1102 (unsigned long long) be64_to_cpu(target
->path
.dgid
.global
.interface_id
));
1104 target
->status
= SRP_PORT_REDIRECT
;
1106 printk(KERN_WARNING
" REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1107 target
->status
= -ECONNRESET
;
1111 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID
:
1112 printk(KERN_WARNING
" REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1113 target
->status
= -ECONNRESET
;
1116 case IB_CM_REJ_CONSUMER_DEFINED
:
1117 opcode
= *(u8
*) event
->private_data
;
1118 if (opcode
== SRP_LOGIN_REJ
) {
1119 struct srp_login_rej
*rej
= event
->private_data
;
1120 u32 reason
= be32_to_cpu(rej
->reason
);
1122 if (reason
== SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE
)
1123 printk(KERN_WARNING PFX
1124 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1126 printk(KERN_WARNING PFX
1127 "SRP LOGIN REJECTED, reason 0x%08x\n", reason
);
1129 printk(KERN_WARNING
" REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1130 " opcode 0x%02x\n", opcode
);
1131 target
->status
= -ECONNRESET
;
1135 printk(KERN_WARNING
" REJ reason 0x%x\n",
1136 event
->param
.rej_rcvd
.reason
);
1137 target
->status
= -ECONNRESET
;
1141 static int srp_cm_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
1143 struct srp_target_port
*target
= cm_id
->context
;
1144 struct ib_qp_attr
*qp_attr
= NULL
;
1149 switch (event
->event
) {
1150 case IB_CM_REQ_ERROR
:
1151 printk(KERN_DEBUG PFX
"Sending CM REQ failed\n");
1153 target
->status
= -ECONNRESET
;
1156 case IB_CM_REP_RECEIVED
:
1158 opcode
= *(u8
*) event
->private_data
;
1160 if (opcode
== SRP_LOGIN_RSP
) {
1161 struct srp_login_rsp
*rsp
= event
->private_data
;
1163 target
->max_ti_iu_len
= be32_to_cpu(rsp
->max_ti_iu_len
);
1164 target
->req_lim
= be32_to_cpu(rsp
->req_lim_delta
);
1166 target
->scsi_host
->can_queue
= min(target
->req_lim
,
1167 target
->scsi_host
->can_queue
);
1169 printk(KERN_WARNING PFX
"Unhandled RSP opcode %#x\n", opcode
);
1170 target
->status
= -ECONNRESET
;
1174 if (!target
->rx_ring
[0]) {
1175 target
->status
= srp_alloc_iu_bufs(target
);
1180 qp_attr
= kmalloc(sizeof *qp_attr
, GFP_KERNEL
);
1182 target
->status
= -ENOMEM
;
1186 qp_attr
->qp_state
= IB_QPS_RTR
;
1187 target
->status
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
1191 target
->status
= ib_modify_qp(target
->qp
, qp_attr
, attr_mask
);
1195 target
->status
= srp_post_recv(target
);
1199 qp_attr
->qp_state
= IB_QPS_RTS
;
1200 target
->status
= ib_cm_init_qp_attr(cm_id
, qp_attr
, &attr_mask
);
1204 target
->status
= ib_modify_qp(target
->qp
, qp_attr
, attr_mask
);
1208 target
->status
= ib_send_cm_rtu(cm_id
, NULL
, 0);
1214 case IB_CM_REJ_RECEIVED
:
1215 printk(KERN_DEBUG PFX
"REJ received\n");
1218 srp_cm_rej_handler(cm_id
, event
, target
);
1221 case IB_CM_DREQ_RECEIVED
:
1222 printk(KERN_WARNING PFX
"DREQ received - connection closed\n");
1223 if (ib_send_cm_drep(cm_id
, NULL
, 0))
1224 printk(KERN_ERR PFX
"Sending CM DREP failed\n");
1227 case IB_CM_TIMEWAIT_EXIT
:
1228 printk(KERN_ERR PFX
"connection closed\n");
1234 case IB_CM_MRA_RECEIVED
:
1235 case IB_CM_DREQ_ERROR
:
1236 case IB_CM_DREP_RECEIVED
:
1240 printk(KERN_WARNING PFX
"Unhandled CM event %d\n", event
->event
);
1245 complete(&target
->done
);
1252 static int srp_send_tsk_mgmt(struct srp_target_port
*target
,
1253 struct srp_request
*req
, u8 func
)
1256 struct srp_tsk_mgmt
*tsk_mgmt
;
1258 spin_lock_irq(target
->scsi_host
->host_lock
);
1260 if (target
->state
== SRP_TARGET_DEAD
||
1261 target
->state
== SRP_TARGET_REMOVED
) {
1262 req
->scmnd
->result
= DID_BAD_TARGET
<< 16;
1266 init_completion(&req
->done
);
1268 iu
= __srp_get_tx_iu(target
);
1273 memset(tsk_mgmt
, 0, sizeof *tsk_mgmt
);
1275 tsk_mgmt
->opcode
= SRP_TSK_MGMT
;
1276 tsk_mgmt
->lun
= cpu_to_be64((u64
) req
->scmnd
->device
->lun
<< 48);
1277 tsk_mgmt
->tag
= req
->index
| SRP_TAG_TSK_MGMT
;
1278 tsk_mgmt
->tsk_mgmt_func
= func
;
1279 tsk_mgmt
->task_tag
= req
->index
;
1281 if (__srp_post_send(target
, iu
, sizeof *tsk_mgmt
))
1286 spin_unlock_irq(target
->scsi_host
->host_lock
);
1288 if (!wait_for_completion_timeout(&req
->done
,
1289 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS
)))
1295 spin_unlock_irq(target
->scsi_host
->host_lock
);
1299 static int srp_find_req(struct srp_target_port
*target
,
1300 struct scsi_cmnd
*scmnd
,
1301 struct srp_request
**req
)
1303 if (scmnd
->host_scribble
== (void *) -1L)
1306 *req
= &target
->req_ring
[(long) scmnd
->host_scribble
];
1311 static int srp_abort(struct scsi_cmnd
*scmnd
)
1313 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
1314 struct srp_request
*req
;
1317 printk(KERN_ERR
"SRP abort called\n");
1319 if (target
->qp_in_error
)
1321 if (srp_find_req(target
, scmnd
, &req
))
1323 if (srp_send_tsk_mgmt(target
, req
, SRP_TSK_ABORT_TASK
))
1326 spin_lock_irq(target
->scsi_host
->host_lock
);
1328 if (req
->cmd_done
) {
1329 srp_remove_req(target
, req
);
1330 scmnd
->scsi_done(scmnd
);
1331 } else if (!req
->tsk_status
) {
1332 srp_remove_req(target
, req
);
1333 scmnd
->result
= DID_ABORT
<< 16;
1337 spin_unlock_irq(target
->scsi_host
->host_lock
);
1342 static int srp_reset_device(struct scsi_cmnd
*scmnd
)
1344 struct srp_target_port
*target
= host_to_target(scmnd
->device
->host
);
1345 struct srp_request
*req
, *tmp
;
1347 printk(KERN_ERR
"SRP reset_device called\n");
1349 if (target
->qp_in_error
)
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_orig_dgid(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
, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1457 be16_to_cpu(target
->orig_dgid
[0]),
1458 be16_to_cpu(target
->orig_dgid
[1]),
1459 be16_to_cpu(target
->orig_dgid
[2]),
1460 be16_to_cpu(target
->orig_dgid
[3]),
1461 be16_to_cpu(target
->orig_dgid
[4]),
1462 be16_to_cpu(target
->orig_dgid
[5]),
1463 be16_to_cpu(target
->orig_dgid
[6]),
1464 be16_to_cpu(target
->orig_dgid
[7]));
1467 static ssize_t
show_zero_req_lim(struct class_device
*cdev
, char *buf
)
1469 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1471 if (target
->state
== SRP_TARGET_DEAD
||
1472 target
->state
== SRP_TARGET_REMOVED
)
1475 return sprintf(buf
, "%d\n", target
->zero_req_lim
);
1478 static ssize_t
show_local_ib_port(struct class_device
*cdev
, char *buf
)
1480 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1482 return sprintf(buf
, "%d\n", target
->srp_host
->port
);
1485 static ssize_t
show_local_ib_device(struct class_device
*cdev
, char *buf
)
1487 struct srp_target_port
*target
= host_to_target(class_to_shost(cdev
));
1489 return sprintf(buf
, "%s\n", target
->srp_host
->dev
->dev
->name
);
1492 static CLASS_DEVICE_ATTR(id_ext
, S_IRUGO
, show_id_ext
, NULL
);
1493 static CLASS_DEVICE_ATTR(ioc_guid
, S_IRUGO
, show_ioc_guid
, NULL
);
1494 static CLASS_DEVICE_ATTR(service_id
, S_IRUGO
, show_service_id
, NULL
);
1495 static CLASS_DEVICE_ATTR(pkey
, S_IRUGO
, show_pkey
, NULL
);
1496 static CLASS_DEVICE_ATTR(dgid
, S_IRUGO
, show_dgid
, NULL
);
1497 static CLASS_DEVICE_ATTR(orig_dgid
, S_IRUGO
, show_orig_dgid
, NULL
);
1498 static CLASS_DEVICE_ATTR(zero_req_lim
, S_IRUGO
, show_zero_req_lim
, NULL
);
1499 static CLASS_DEVICE_ATTR(local_ib_port
, S_IRUGO
, show_local_ib_port
, NULL
);
1500 static CLASS_DEVICE_ATTR(local_ib_device
, S_IRUGO
, show_local_ib_device
, NULL
);
1502 static struct class_device_attribute
*srp_host_attrs
[] = {
1503 &class_device_attr_id_ext
,
1504 &class_device_attr_ioc_guid
,
1505 &class_device_attr_service_id
,
1506 &class_device_attr_pkey
,
1507 &class_device_attr_dgid
,
1508 &class_device_attr_orig_dgid
,
1509 &class_device_attr_zero_req_lim
,
1510 &class_device_attr_local_ib_port
,
1511 &class_device_attr_local_ib_device
,
1515 static struct scsi_host_template srp_template
= {
1516 .module
= THIS_MODULE
,
1517 .name
= "InfiniBand SRP initiator",
1518 .proc_name
= DRV_NAME
,
1519 .info
= srp_target_info
,
1520 .queuecommand
= srp_queuecommand
,
1521 .eh_abort_handler
= srp_abort
,
1522 .eh_device_reset_handler
= srp_reset_device
,
1523 .eh_host_reset_handler
= srp_reset_host
,
1524 .can_queue
= SRP_SQ_SIZE
,
1526 .cmd_per_lun
= SRP_SQ_SIZE
,
1527 .use_clustering
= ENABLE_CLUSTERING
,
1528 .shost_attrs
= srp_host_attrs
1531 static int srp_add_target(struct srp_host
*host
, struct srp_target_port
*target
)
1533 sprintf(target
->target_name
, "SRP.T10:%016llX",
1534 (unsigned long long) be64_to_cpu(target
->id_ext
));
1536 if (scsi_add_host(target
->scsi_host
, host
->dev
->dev
->dma_device
))
1539 spin_lock(&host
->target_lock
);
1540 list_add_tail(&target
->list
, &host
->target_list
);
1541 spin_unlock(&host
->target_lock
);
1543 target
->state
= SRP_TARGET_LIVE
;
1545 scsi_scan_target(&target
->scsi_host
->shost_gendev
,
1546 0, target
->scsi_id
, SCAN_WILD_CARD
, 0);
1551 static void srp_release_class_dev(struct class_device
*class_dev
)
1553 struct srp_host
*host
=
1554 container_of(class_dev
, struct srp_host
, class_dev
);
1556 complete(&host
->released
);
1559 static struct class srp_class
= {
1560 .name
= "infiniband_srp",
1561 .release
= srp_release_class_dev
1565 * Target ports are added by writing
1567 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1568 * pkey=<P_Key>,service_id=<service ID>
1570 * to the add_target sysfs attribute.
1574 SRP_OPT_ID_EXT
= 1 << 0,
1575 SRP_OPT_IOC_GUID
= 1 << 1,
1576 SRP_OPT_DGID
= 1 << 2,
1577 SRP_OPT_PKEY
= 1 << 3,
1578 SRP_OPT_SERVICE_ID
= 1 << 4,
1579 SRP_OPT_MAX_SECT
= 1 << 5,
1580 SRP_OPT_MAX_CMD_PER_LUN
= 1 << 6,
1581 SRP_OPT_IO_CLASS
= 1 << 7,
1582 SRP_OPT_INITIATOR_EXT
= 1 << 8,
1583 SRP_OPT_ALL
= (SRP_OPT_ID_EXT
|
1587 SRP_OPT_SERVICE_ID
),
1590 static match_table_t srp_opt_tokens
= {
1591 { SRP_OPT_ID_EXT
, "id_ext=%s" },
1592 { SRP_OPT_IOC_GUID
, "ioc_guid=%s" },
1593 { SRP_OPT_DGID
, "dgid=%s" },
1594 { SRP_OPT_PKEY
, "pkey=%x" },
1595 { SRP_OPT_SERVICE_ID
, "service_id=%s" },
1596 { SRP_OPT_MAX_SECT
, "max_sect=%d" },
1597 { SRP_OPT_MAX_CMD_PER_LUN
, "max_cmd_per_lun=%d" },
1598 { SRP_OPT_IO_CLASS
, "io_class=%x" },
1599 { SRP_OPT_INITIATOR_EXT
, "initiator_ext=%s" },
1600 { SRP_OPT_ERR
, NULL
}
1603 static int srp_parse_options(const char *buf
, struct srp_target_port
*target
)
1605 char *options
, *sep_opt
;
1608 substring_t args
[MAX_OPT_ARGS
];
1614 options
= kstrdup(buf
, GFP_KERNEL
);
1619 while ((p
= strsep(&sep_opt
, ",")) != NULL
) {
1623 token
= match_token(p
, srp_opt_tokens
, args
);
1627 case SRP_OPT_ID_EXT
:
1628 p
= match_strdup(args
);
1633 target
->id_ext
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1637 case SRP_OPT_IOC_GUID
:
1638 p
= match_strdup(args
);
1643 target
->ioc_guid
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1648 p
= match_strdup(args
);
1653 if (strlen(p
) != 32) {
1654 printk(KERN_WARNING PFX
"bad dest GID parameter '%s'\n", p
);
1659 for (i
= 0; i
< 16; ++i
) {
1660 strlcpy(dgid
, p
+ i
* 2, 3);
1661 target
->path
.dgid
.raw
[i
] = simple_strtoul(dgid
, NULL
, 16);
1664 memcpy(target
->orig_dgid
, target
->path
.dgid
.raw
, 16);
1668 if (match_hex(args
, &token
)) {
1669 printk(KERN_WARNING PFX
"bad P_Key parameter '%s'\n", p
);
1672 target
->path
.pkey
= cpu_to_be16(token
);
1675 case SRP_OPT_SERVICE_ID
:
1676 p
= match_strdup(args
);
1681 target
->service_id
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1685 case SRP_OPT_MAX_SECT
:
1686 if (match_int(args
, &token
)) {
1687 printk(KERN_WARNING PFX
"bad max sect parameter '%s'\n", p
);
1690 target
->scsi_host
->max_sectors
= token
;
1693 case SRP_OPT_MAX_CMD_PER_LUN
:
1694 if (match_int(args
, &token
)) {
1695 printk(KERN_WARNING PFX
"bad max cmd_per_lun parameter '%s'\n", p
);
1698 target
->scsi_host
->cmd_per_lun
= min(token
, SRP_SQ_SIZE
);
1701 case SRP_OPT_IO_CLASS
:
1702 if (match_hex(args
, &token
)) {
1703 printk(KERN_WARNING PFX
"bad IO class parameter '%s' \n", p
);
1706 if (token
!= SRP_REV10_IB_IO_CLASS
&&
1707 token
!= SRP_REV16A_IB_IO_CLASS
) {
1708 printk(KERN_WARNING PFX
"unknown IO class parameter value"
1709 " %x specified (use %x or %x).\n",
1710 token
, SRP_REV10_IB_IO_CLASS
, SRP_REV16A_IB_IO_CLASS
);
1713 target
->io_class
= token
;
1716 case SRP_OPT_INITIATOR_EXT
:
1717 p
= match_strdup(args
);
1722 target
->initiator_ext
= cpu_to_be64(simple_strtoull(p
, NULL
, 16));
1727 printk(KERN_WARNING PFX
"unknown parameter or missing value "
1728 "'%s' in target creation request\n", p
);
1733 if ((opt_mask
& SRP_OPT_ALL
) == SRP_OPT_ALL
)
1736 for (i
= 0; i
< ARRAY_SIZE(srp_opt_tokens
); ++i
)
1737 if ((srp_opt_tokens
[i
].token
& SRP_OPT_ALL
) &&
1738 !(srp_opt_tokens
[i
].token
& opt_mask
))
1739 printk(KERN_WARNING PFX
"target creation request is "
1740 "missing parameter '%s'\n",
1741 srp_opt_tokens
[i
].pattern
);
1748 static ssize_t
srp_create_target(struct class_device
*class_dev
,
1749 const char *buf
, size_t count
)
1751 struct srp_host
*host
=
1752 container_of(class_dev
, struct srp_host
, class_dev
);
1753 struct Scsi_Host
*target_host
;
1754 struct srp_target_port
*target
;
1758 target_host
= scsi_host_alloc(&srp_template
,
1759 sizeof (struct srp_target_port
));
1763 target_host
->max_lun
= SRP_MAX_LUN
;
1764 target_host
->max_cmd_len
= sizeof ((struct srp_cmd
*) (void *) 0L)->cdb
;
1766 target
= host_to_target(target_host
);
1768 target
->io_class
= SRP_REV16A_IB_IO_CLASS
;
1769 target
->scsi_host
= target_host
;
1770 target
->srp_host
= host
;
1772 INIT_LIST_HEAD(&target
->free_reqs
);
1773 INIT_LIST_HEAD(&target
->req_queue
);
1774 for (i
= 0; i
< SRP_SQ_SIZE
; ++i
) {
1775 target
->req_ring
[i
].index
= i
;
1776 list_add_tail(&target
->req_ring
[i
].list
, &target
->free_reqs
);
1779 ret
= srp_parse_options(buf
, target
);
1783 ib_get_cached_gid(host
->dev
->dev
, host
->port
, 0, &target
->path
.sgid
);
1785 printk(KERN_DEBUG PFX
"new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1786 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1787 (unsigned long long) be64_to_cpu(target
->id_ext
),
1788 (unsigned long long) be64_to_cpu(target
->ioc_guid
),
1789 be16_to_cpu(target
->path
.pkey
),
1790 (unsigned long long) be64_to_cpu(target
->service_id
),
1791 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[0]),
1792 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[2]),
1793 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[4]),
1794 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[6]),
1795 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[8]),
1796 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[10]),
1797 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[12]),
1798 (int) be16_to_cpu(*(__be16
*) &target
->path
.dgid
.raw
[14]));
1800 ret
= srp_create_target_ib(target
);
1804 target
->cm_id
= ib_create_cm_id(host
->dev
->dev
, srp_cm_handler
, target
);
1805 if (IS_ERR(target
->cm_id
)) {
1806 ret
= PTR_ERR(target
->cm_id
);
1810 target
->qp_in_error
= 0;
1811 ret
= srp_connect_target(target
);
1813 printk(KERN_ERR PFX
"Connection failed\n");
1817 ret
= srp_add_target(host
, target
);
1819 goto err_disconnect
;
1824 srp_disconnect_target(target
);
1827 ib_destroy_cm_id(target
->cm_id
);
1830 srp_free_target_ib(target
);
1833 scsi_host_put(target_host
);
1838 static CLASS_DEVICE_ATTR(add_target
, S_IWUSR
, NULL
, srp_create_target
);
1840 static ssize_t
show_ibdev(struct class_device
*class_dev
, char *buf
)
1842 struct srp_host
*host
=
1843 container_of(class_dev
, struct srp_host
, class_dev
);
1845 return sprintf(buf
, "%s\n", host
->dev
->dev
->name
);
1848 static CLASS_DEVICE_ATTR(ibdev
, S_IRUGO
, show_ibdev
, NULL
);
1850 static ssize_t
show_port(struct class_device
*class_dev
, char *buf
)
1852 struct srp_host
*host
=
1853 container_of(class_dev
, struct srp_host
, class_dev
);
1855 return sprintf(buf
, "%d\n", host
->port
);
1858 static CLASS_DEVICE_ATTR(port
, S_IRUGO
, show_port
, NULL
);
1860 static struct srp_host
*srp_add_port(struct srp_device
*device
, u8 port
)
1862 struct srp_host
*host
;
1864 host
= kzalloc(sizeof *host
, GFP_KERNEL
);
1868 INIT_LIST_HEAD(&host
->target_list
);
1869 spin_lock_init(&host
->target_lock
);
1870 init_completion(&host
->released
);
1874 host
->class_dev
.class = &srp_class
;
1875 host
->class_dev
.dev
= device
->dev
->dma_device
;
1876 snprintf(host
->class_dev
.class_id
, BUS_ID_SIZE
, "srp-%s-%d",
1877 device
->dev
->name
, port
);
1879 if (class_device_register(&host
->class_dev
))
1881 if (class_device_create_file(&host
->class_dev
, &class_device_attr_add_target
))
1883 if (class_device_create_file(&host
->class_dev
, &class_device_attr_ibdev
))
1885 if (class_device_create_file(&host
->class_dev
, &class_device_attr_port
))
1891 class_device_unregister(&host
->class_dev
);
1899 static void srp_add_one(struct ib_device
*device
)
1901 struct srp_device
*srp_dev
;
1902 struct ib_device_attr
*dev_attr
;
1903 struct ib_fmr_pool_param fmr_param
;
1904 struct srp_host
*host
;
1907 dev_attr
= kmalloc(sizeof *dev_attr
, GFP_KERNEL
);
1911 if (ib_query_device(device
, dev_attr
)) {
1912 printk(KERN_WARNING PFX
"Query device failed for %s\n",
1917 srp_dev
= kmalloc(sizeof *srp_dev
, GFP_KERNEL
);
1922 * Use the smallest page size supported by the HCA, down to a
1923 * minimum of 512 bytes (which is the smallest sector that a
1924 * SCSI command will ever carry).
1926 srp_dev
->fmr_page_shift
= max(9, ffs(dev_attr
->page_size_cap
) - 1);
1927 srp_dev
->fmr_page_size
= 1 << srp_dev
->fmr_page_shift
;
1928 srp_dev
->fmr_page_mask
= ~((u64
) srp_dev
->fmr_page_size
- 1);
1930 INIT_LIST_HEAD(&srp_dev
->dev_list
);
1932 srp_dev
->dev
= device
;
1933 srp_dev
->pd
= ib_alloc_pd(device
);
1934 if (IS_ERR(srp_dev
->pd
))
1937 srp_dev
->mr
= ib_get_dma_mr(srp_dev
->pd
,
1938 IB_ACCESS_LOCAL_WRITE
|
1939 IB_ACCESS_REMOTE_READ
|
1940 IB_ACCESS_REMOTE_WRITE
);
1941 if (IS_ERR(srp_dev
->mr
))
1944 memset(&fmr_param
, 0, sizeof fmr_param
);
1945 fmr_param
.pool_size
= SRP_FMR_POOL_SIZE
;
1946 fmr_param
.dirty_watermark
= SRP_FMR_DIRTY_SIZE
;
1947 fmr_param
.cache
= 1;
1948 fmr_param
.max_pages_per_fmr
= SRP_FMR_SIZE
;
1949 fmr_param
.page_shift
= srp_dev
->fmr_page_shift
;
1950 fmr_param
.access
= (IB_ACCESS_LOCAL_WRITE
|
1951 IB_ACCESS_REMOTE_WRITE
|
1952 IB_ACCESS_REMOTE_READ
);
1954 srp_dev
->fmr_pool
= ib_create_fmr_pool(srp_dev
->pd
, &fmr_param
);
1955 if (IS_ERR(srp_dev
->fmr_pool
))
1956 srp_dev
->fmr_pool
= NULL
;
1958 if (device
->node_type
== RDMA_NODE_IB_SWITCH
) {
1963 e
= device
->phys_port_cnt
;
1966 for (p
= s
; p
<= e
; ++p
) {
1967 host
= srp_add_port(srp_dev
, p
);
1969 list_add_tail(&host
->list
, &srp_dev
->dev_list
);
1972 ib_set_client_data(device
, &srp_client
, srp_dev
);
1977 ib_dealloc_pd(srp_dev
->pd
);
1986 static void srp_remove_one(struct ib_device
*device
)
1988 struct srp_device
*srp_dev
;
1989 struct srp_host
*host
, *tmp_host
;
1990 LIST_HEAD(target_list
);
1991 struct srp_target_port
*target
, *tmp_target
;
1993 srp_dev
= ib_get_client_data(device
, &srp_client
);
1995 list_for_each_entry_safe(host
, tmp_host
, &srp_dev
->dev_list
, list
) {
1996 class_device_unregister(&host
->class_dev
);
1998 * Wait for the sysfs entry to go away, so that no new
1999 * target ports can be created.
2001 wait_for_completion(&host
->released
);
2004 * Mark all target ports as removed, so we stop queueing
2005 * commands and don't try to reconnect.
2007 spin_lock(&host
->target_lock
);
2008 list_for_each_entry(target
, &host
->target_list
, list
) {
2009 spin_lock_irq(target
->scsi_host
->host_lock
);
2010 target
->state
= SRP_TARGET_REMOVED
;
2011 spin_unlock_irq(target
->scsi_host
->host_lock
);
2013 spin_unlock(&host
->target_lock
);
2016 * Wait for any reconnection tasks that may have
2017 * started before we marked our target ports as
2018 * removed, and any target port removal tasks.
2020 flush_scheduled_work();
2022 list_for_each_entry_safe(target
, tmp_target
,
2023 &host
->target_list
, list
) {
2024 scsi_remove_host(target
->scsi_host
);
2025 srp_disconnect_target(target
);
2026 ib_destroy_cm_id(target
->cm_id
);
2027 srp_free_target_ib(target
);
2028 scsi_host_put(target
->scsi_host
);
2034 if (srp_dev
->fmr_pool
)
2035 ib_destroy_fmr_pool(srp_dev
->fmr_pool
);
2036 ib_dereg_mr(srp_dev
->mr
);
2037 ib_dealloc_pd(srp_dev
->pd
);
2042 static int __init
srp_init_module(void)
2046 srp_template
.sg_tablesize
= srp_sg_tablesize
;
2047 srp_max_iu_len
= (sizeof (struct srp_cmd
) +
2048 sizeof (struct srp_indirect_buf
) +
2049 srp_sg_tablesize
* 16);
2051 ret
= class_register(&srp_class
);
2053 printk(KERN_ERR PFX
"couldn't register class infiniband_srp\n");
2057 ib_sa_register_client(&srp_sa_client
);
2059 ret
= ib_register_client(&srp_client
);
2061 printk(KERN_ERR PFX
"couldn't register IB client\n");
2062 ib_sa_unregister_client(&srp_sa_client
);
2063 class_unregister(&srp_class
);
2070 static void __exit
srp_cleanup_module(void)
2072 ib_unregister_client(&srp_client
);
2073 ib_sa_unregister_client(&srp_sa_client
);
2074 class_unregister(&srp_class
);
2077 module_init(srp_init_module
);
2078 module_exit(srp_cleanup_module
);