4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include <linux/types.h>
25 #include <linux/kfifo.h>
26 #include <linux/delay.h>
27 #include <linux/log2.h>
28 #include <asm/unaligned.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi.h>
36 #include <scsi/iscsi_proto.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_transport_iscsi.h>
39 #include <scsi/libiscsi.h>
41 static int iscsi_dbg_lib
;
42 module_param_named(debug_libiscsi
, iscsi_dbg_lib
, int, S_IRUGO
| S_IWUSR
);
43 MODULE_PARM_DESC(debug_libiscsi
, "Turn on debugging for libiscsi module. "
44 "Set to 1 to turn on, and zero to turn off. Default "
47 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
50 iscsi_conn_printk(KERN_INFO, _conn, \
55 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
58 iscsi_session_printk(KERN_INFO, _session, \
63 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
64 #define SNA32_CHECK 2147483648UL
66 static int iscsi_sna_lt(u32 n1
, u32 n2
)
68 return n1
!= n2
&& ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
69 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
72 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
73 static int iscsi_sna_lte(u32 n1
, u32 n2
)
75 return n1
== n2
|| ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
76 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
79 inline void iscsi_conn_queue_work(struct iscsi_conn
*conn
)
81 struct Scsi_Host
*shost
= conn
->session
->host
;
82 struct iscsi_host
*ihost
= shost_priv(shost
);
84 queue_work(ihost
->workq
, &conn
->xmitwork
);
86 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work
);
89 iscsi_update_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
91 uint32_t max_cmdsn
= be32_to_cpu(hdr
->max_cmdsn
);
92 uint32_t exp_cmdsn
= be32_to_cpu(hdr
->exp_cmdsn
);
95 * standard specifies this check for when to update expected and
96 * max sequence numbers
98 if (iscsi_sna_lt(max_cmdsn
, exp_cmdsn
- 1))
101 if (exp_cmdsn
!= session
->exp_cmdsn
&&
102 !iscsi_sna_lt(exp_cmdsn
, session
->exp_cmdsn
))
103 session
->exp_cmdsn
= exp_cmdsn
;
105 if (max_cmdsn
!= session
->max_cmdsn
&&
106 !iscsi_sna_lt(max_cmdsn
, session
->max_cmdsn
)) {
107 session
->max_cmdsn
= max_cmdsn
;
109 * if the window closed with IO queued, then kick the
112 if (!list_empty(&session
->leadconn
->xmitqueue
) ||
113 !list_empty(&session
->leadconn
->mgmtqueue
)) {
114 if (!(session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
115 iscsi_conn_queue_work(session
->leadconn
);
119 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn
);
122 * iscsi_prep_data_out_pdu - initialize Data-Out
123 * @task: scsi command task
125 * @hdr: iscsi data in pdu
128 * Initialize Data-Out within this R2T sequence and finds
129 * proper data_offset within this SCSI command.
131 * This function is called with connection lock taken.
133 void iscsi_prep_data_out_pdu(struct iscsi_task
*task
, struct iscsi_r2t_info
*r2t
,
134 struct iscsi_data
*hdr
)
136 struct iscsi_conn
*conn
= task
->conn
;
137 unsigned int left
= r2t
->data_length
- r2t
->sent
;
139 task
->hdr_len
= sizeof(struct iscsi_data
);
141 memset(hdr
, 0, sizeof(struct iscsi_data
));
143 hdr
->datasn
= cpu_to_be32(r2t
->datasn
);
145 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
146 memcpy(hdr
->lun
, task
->lun
, sizeof(hdr
->lun
));
147 hdr
->itt
= task
->hdr_itt
;
148 hdr
->exp_statsn
= r2t
->exp_statsn
;
149 hdr
->offset
= cpu_to_be32(r2t
->data_offset
+ r2t
->sent
);
150 if (left
> conn
->max_xmit_dlength
) {
151 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
152 r2t
->data_count
= conn
->max_xmit_dlength
;
155 hton24(hdr
->dlength
, left
);
156 r2t
->data_count
= left
;
157 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
159 conn
->dataout_pdus_cnt
++;
161 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu
);
163 static int iscsi_add_hdr(struct iscsi_task
*task
, unsigned len
)
165 unsigned exp_len
= task
->hdr_len
+ len
;
167 if (exp_len
> task
->hdr_max
) {
172 WARN_ON(len
& (ISCSI_PAD_LEN
- 1)); /* caller must pad the AHS */
173 task
->hdr_len
= exp_len
;
178 * make an extended cdb AHS
180 static int iscsi_prep_ecdb_ahs(struct iscsi_task
*task
)
182 struct scsi_cmnd
*cmd
= task
->sc
;
183 unsigned rlen
, pad_len
;
184 unsigned short ahslength
;
185 struct iscsi_ecdb_ahdr
*ecdb_ahdr
;
188 ecdb_ahdr
= iscsi_next_hdr(task
);
189 rlen
= cmd
->cmd_len
- ISCSI_CDB_SIZE
;
191 BUG_ON(rlen
> sizeof(ecdb_ahdr
->ecdb
));
192 ahslength
= rlen
+ sizeof(ecdb_ahdr
->reserved
);
194 pad_len
= iscsi_padding(rlen
);
196 rc
= iscsi_add_hdr(task
, sizeof(ecdb_ahdr
->ahslength
) +
197 sizeof(ecdb_ahdr
->ahstype
) + ahslength
+ pad_len
);
202 memset(&ecdb_ahdr
->ecdb
[rlen
], 0, pad_len
);
204 ecdb_ahdr
->ahslength
= cpu_to_be16(ahslength
);
205 ecdb_ahdr
->ahstype
= ISCSI_AHSTYPE_CDB
;
206 ecdb_ahdr
->reserved
= 0;
207 memcpy(ecdb_ahdr
->ecdb
, cmd
->cmnd
+ ISCSI_CDB_SIZE
, rlen
);
209 ISCSI_DBG_SESSION(task
->conn
->session
,
210 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
211 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
212 "%u\n", cmd
->cmd_len
, rlen
, pad_len
, ahslength
,
217 static int iscsi_prep_bidi_ahs(struct iscsi_task
*task
)
219 struct scsi_cmnd
*sc
= task
->sc
;
220 struct iscsi_rlength_ahdr
*rlen_ahdr
;
223 rlen_ahdr
= iscsi_next_hdr(task
);
224 rc
= iscsi_add_hdr(task
, sizeof(*rlen_ahdr
));
228 rlen_ahdr
->ahslength
=
229 cpu_to_be16(sizeof(rlen_ahdr
->read_length
) +
230 sizeof(rlen_ahdr
->reserved
));
231 rlen_ahdr
->ahstype
= ISCSI_AHSTYPE_RLENGTH
;
232 rlen_ahdr
->reserved
= 0;
233 rlen_ahdr
->read_length
= cpu_to_be32(scsi_in(sc
)->length
);
235 ISCSI_DBG_SESSION(task
->conn
->session
,
236 "bidi-in rlen_ahdr->read_length(%d) "
237 "rlen_ahdr->ahslength(%d)\n",
238 be32_to_cpu(rlen_ahdr
->read_length
),
239 be16_to_cpu(rlen_ahdr
->ahslength
));
244 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
247 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
248 * fields like dlength or final based on how much data it sends
250 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task
*task
)
252 struct iscsi_conn
*conn
= task
->conn
;
253 struct iscsi_session
*session
= conn
->session
;
254 struct scsi_cmnd
*sc
= task
->sc
;
255 struct iscsi_cmd
*hdr
;
256 unsigned hdrlength
, cmd_len
;
260 if (conn
->session
->tt
->alloc_pdu
) {
261 rc
= conn
->session
->tt
->alloc_pdu(task
, ISCSI_OP_SCSI_CMD
);
265 hdr
= (struct iscsi_cmd
*) task
->hdr
;
267 memset(hdr
, 0, sizeof(*hdr
));
269 if (session
->tt
->parse_pdu_itt
)
270 hdr
->itt
= task
->hdr_itt
= itt
;
272 hdr
->itt
= task
->hdr_itt
= build_itt(task
->itt
,
273 task
->conn
->session
->age
);
275 rc
= iscsi_add_hdr(task
, sizeof(*hdr
));
278 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
279 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
280 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
281 memcpy(task
->lun
, hdr
->lun
, sizeof(task
->lun
));
282 hdr
->cmdsn
= task
->cmdsn
= cpu_to_be32(session
->cmdsn
);
284 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
285 cmd_len
= sc
->cmd_len
;
286 if (cmd_len
< ISCSI_CDB_SIZE
)
287 memset(&hdr
->cdb
[cmd_len
], 0, ISCSI_CDB_SIZE
- cmd_len
);
288 else if (cmd_len
> ISCSI_CDB_SIZE
) {
289 rc
= iscsi_prep_ecdb_ahs(task
);
292 cmd_len
= ISCSI_CDB_SIZE
;
294 memcpy(hdr
->cdb
, sc
->cmnd
, cmd_len
);
297 if (scsi_bidi_cmnd(sc
)) {
298 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
299 rc
= iscsi_prep_bidi_ahs(task
);
303 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
304 unsigned out_len
= scsi_out(sc
)->length
;
305 struct iscsi_r2t_info
*r2t
= &task
->unsol_r2t
;
307 hdr
->data_length
= cpu_to_be32(out_len
);
308 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
312 * imm_count bytes to be sent right after
315 * unsol_count bytes(as Data-Out) to be sent
316 * without R2T ack right after
319 * r2t data_length bytes to be sent via R2T ack's
321 * pad_count bytes to be sent as zero-padding
323 memset(r2t
, 0, sizeof(*r2t
));
325 if (session
->imm_data_en
) {
326 if (out_len
>= session
->first_burst
)
327 task
->imm_count
= min(session
->first_burst
,
328 conn
->max_xmit_dlength
);
330 task
->imm_count
= min(out_len
,
331 conn
->max_xmit_dlength
);
332 hton24(hdr
->dlength
, task
->imm_count
);
334 zero_data(hdr
->dlength
);
336 if (!session
->initial_r2t_en
) {
337 r2t
->data_length
= min(session
->first_burst
, out_len
) -
339 r2t
->data_offset
= task
->imm_count
;
340 r2t
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
341 r2t
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
344 if (!task
->unsol_r2t
.data_length
)
345 /* No unsolicit Data-Out's */
346 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
348 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
349 zero_data(hdr
->dlength
);
350 hdr
->data_length
= cpu_to_be32(scsi_in(sc
)->length
);
352 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
353 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
356 /* calculate size of additional header segments (AHSs) */
357 hdrlength
= task
->hdr_len
- sizeof(*hdr
);
359 WARN_ON(hdrlength
& (ISCSI_PAD_LEN
-1));
360 hdrlength
/= ISCSI_PAD_LEN
;
362 WARN_ON(hdrlength
>= 256);
363 hdr
->hlength
= hdrlength
& 0xFF;
365 if (session
->tt
->init_task
&& session
->tt
->init_task(task
))
368 task
->state
= ISCSI_TASK_RUNNING
;
369 list_move_tail(&task
->running
, &conn
->run_list
);
371 conn
->scsicmd_pdus_cnt
++;
372 ISCSI_DBG_SESSION(session
, "iscsi prep [%s cid %d sc %p cdb 0x%x "
373 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
374 scsi_bidi_cmnd(sc
) ? "bidirectional" :
375 sc
->sc_data_direction
== DMA_TO_DEVICE
?
376 "write" : "read", conn
->id
, sc
, sc
->cmnd
[0],
377 task
->itt
, scsi_bufflen(sc
),
378 scsi_bidi_cmnd(sc
) ? scsi_in(sc
)->length
: 0,
380 session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
385 * iscsi_complete_command - finish a task
386 * @task: iscsi cmd task
388 * Must be called with session lock.
389 * This function returns the scsi command to scsi-ml or cleans
390 * up mgmt tasks then returns the task to the pool.
392 static void iscsi_complete_command(struct iscsi_task
*task
)
394 struct iscsi_conn
*conn
= task
->conn
;
395 struct iscsi_session
*session
= conn
->session
;
396 struct scsi_cmnd
*sc
= task
->sc
;
398 session
->tt
->cleanup_task(task
);
399 list_del_init(&task
->running
);
400 task
->state
= ISCSI_TASK_COMPLETED
;
403 if (conn
->task
== task
)
406 * login task is preallocated so do not free
408 if (conn
->login_task
== task
)
411 __kfifo_put(session
->cmdpool
.queue
, (void*)&task
, sizeof(void*));
413 if (conn
->ping_task
== task
)
414 conn
->ping_task
= NULL
;
418 /* SCSI eh reuses commands to verify us */
421 * queue command may call this to free the task, but
422 * not have setup the sc callback
429 void __iscsi_get_task(struct iscsi_task
*task
)
431 atomic_inc(&task
->refcount
);
433 EXPORT_SYMBOL_GPL(__iscsi_get_task
);
435 static void __iscsi_put_task(struct iscsi_task
*task
)
437 if (atomic_dec_and_test(&task
->refcount
))
438 iscsi_complete_command(task
);
441 void iscsi_put_task(struct iscsi_task
*task
)
443 struct iscsi_session
*session
= task
->conn
->session
;
445 spin_lock_bh(&session
->lock
);
446 __iscsi_put_task(task
);
447 spin_unlock_bh(&session
->lock
);
449 EXPORT_SYMBOL_GPL(iscsi_put_task
);
452 * session lock must be held
454 static void fail_command(struct iscsi_conn
*conn
, struct iscsi_task
*task
,
457 struct scsi_cmnd
*sc
;
463 if (task
->state
== ISCSI_TASK_PENDING
)
465 * cmd never made it to the xmit thread, so we should not count
466 * the cmd in the sequencing
468 conn
->session
->queued_cmdsn
--;
471 if (!scsi_bidi_cmnd(sc
))
472 scsi_set_resid(sc
, scsi_bufflen(sc
));
474 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
475 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
478 if (conn
->task
== task
)
480 /* release ref from queuecommand */
481 __iscsi_put_task(task
);
484 static int iscsi_prep_mgmt_task(struct iscsi_conn
*conn
,
485 struct iscsi_task
*task
)
487 struct iscsi_session
*session
= conn
->session
;
488 struct iscsi_hdr
*hdr
= task
->hdr
;
489 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
491 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
494 if (hdr
->opcode
!= (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) &&
495 hdr
->opcode
!= (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
496 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
498 * pre-format CmdSN for outgoing PDU.
500 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
501 if (hdr
->itt
!= RESERVED_ITT
) {
503 * TODO: We always use immediate, so we never hit this.
504 * If we start to send tmfs or nops as non-immediate then
505 * we should start checking the cmdsn numbers for mgmt tasks.
507 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
508 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
509 session
->queued_cmdsn
++;
514 if (session
->tt
->init_task
&& session
->tt
->init_task(task
))
517 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
)
518 session
->state
= ISCSI_STATE_LOGGING_OUT
;
520 task
->state
= ISCSI_TASK_RUNNING
;
521 list_move_tail(&task
->running
, &conn
->mgmt_run_list
);
522 ISCSI_DBG_SESSION(session
, "mgmtpdu [op 0x%x hdr->itt 0x%x "
523 "datalen %d]\n", hdr
->opcode
& ISCSI_OPCODE_MASK
,
524 hdr
->itt
, task
->data_count
);
528 static struct iscsi_task
*
529 __iscsi_conn_send_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
530 char *data
, uint32_t data_size
)
532 struct iscsi_session
*session
= conn
->session
;
533 struct iscsi_task
*task
;
536 if (session
->state
== ISCSI_STATE_TERMINATE
)
539 if (hdr
->opcode
== (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) ||
540 hdr
->opcode
== (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
542 * Login and Text are sent serially, in
543 * request-followed-by-response sequence.
544 * Same task can be used. Same ITT must be used.
545 * Note that login_task is preallocated at conn_create().
547 task
= conn
->login_task
;
549 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
550 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
552 if (!__kfifo_get(session
->cmdpool
.queue
,
553 (void*)&task
, sizeof(void*)))
557 * released in complete pdu for task we expect a response for, and
558 * released by the lld when it has transmitted the task for
559 * pdus we do not expect a response for.
561 atomic_set(&task
->refcount
, 1);
566 memcpy(task
->data
, data
, data_size
);
567 task
->data_count
= data_size
;
569 task
->data_count
= 0;
571 if (conn
->session
->tt
->alloc_pdu
) {
572 if (conn
->session
->tt
->alloc_pdu(task
, hdr
->opcode
)) {
573 iscsi_conn_printk(KERN_ERR
, conn
, "Could not allocate "
574 "pdu for mgmt task.\n");
579 itt
= task
->hdr
->itt
;
580 task
->hdr_len
= sizeof(struct iscsi_hdr
);
581 memcpy(task
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
583 if (hdr
->itt
!= RESERVED_ITT
) {
584 if (session
->tt
->parse_pdu_itt
)
585 task
->hdr
->itt
= itt
;
587 task
->hdr
->itt
= build_itt(task
->itt
,
588 task
->conn
->session
->age
);
591 INIT_LIST_HEAD(&task
->running
);
592 list_add_tail(&task
->running
, &conn
->mgmtqueue
);
594 if (session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
) {
595 if (iscsi_prep_mgmt_task(conn
, task
))
598 if (session
->tt
->xmit_task(task
))
602 iscsi_conn_queue_work(conn
);
607 __iscsi_put_task(task
);
611 if (task
!= conn
->login_task
)
612 __kfifo_put(session
->cmdpool
.queue
, (void*)&task
,
617 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
618 char *data
, uint32_t data_size
)
620 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
621 struct iscsi_session
*session
= conn
->session
;
624 spin_lock_bh(&session
->lock
);
625 if (!__iscsi_conn_send_pdu(conn
, hdr
, data
, data_size
))
627 spin_unlock_bh(&session
->lock
);
630 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
633 * iscsi_cmd_rsp - SCSI Command Response processing
634 * @conn: iscsi connection
636 * @task: scsi command task
637 * @data: cmd data buffer
638 * @datalen: len of buffer
640 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
641 * then completes the command and task.
643 static void iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
644 struct iscsi_task
*task
, char *data
,
647 struct iscsi_cmd_rsp
*rhdr
= (struct iscsi_cmd_rsp
*)hdr
;
648 struct iscsi_session
*session
= conn
->session
;
649 struct scsi_cmnd
*sc
= task
->sc
;
651 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
652 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
654 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
656 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
657 sc
->result
= DID_ERROR
<< 16;
661 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
666 iscsi_conn_printk(KERN_ERR
, conn
,
667 "Got CHECK_CONDITION but invalid data "
668 "buffer size of %d\n", datalen
);
669 sc
->result
= DID_BAD_TARGET
<< 16;
673 senselen
= get_unaligned_be16(data
);
674 if (datalen
< senselen
)
675 goto invalid_datalen
;
677 memcpy(sc
->sense_buffer
, data
+ 2,
678 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
679 ISCSI_DBG_SESSION(session
, "copied %d bytes of sense\n",
680 min_t(uint16_t, senselen
,
681 SCSI_SENSE_BUFFERSIZE
));
684 if (rhdr
->flags
& (ISCSI_FLAG_CMD_BIDI_UNDERFLOW
|
685 ISCSI_FLAG_CMD_BIDI_OVERFLOW
)) {
686 int res_count
= be32_to_cpu(rhdr
->bi_residual_count
);
688 if (scsi_bidi_cmnd(sc
) && res_count
> 0 &&
689 (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_OVERFLOW
||
690 res_count
<= scsi_in(sc
)->length
))
691 scsi_in(sc
)->resid
= res_count
;
693 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
696 if (rhdr
->flags
& (ISCSI_FLAG_CMD_UNDERFLOW
|
697 ISCSI_FLAG_CMD_OVERFLOW
)) {
698 int res_count
= be32_to_cpu(rhdr
->residual_count
);
701 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
702 res_count
<= scsi_bufflen(sc
)))
703 /* write side for bidi or uni-io set_resid */
704 scsi_set_resid(sc
, res_count
);
706 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
709 ISCSI_DBG_SESSION(session
, "done [sc %p res %d itt 0x%x]\n",
710 sc
, sc
->result
, task
->itt
);
711 conn
->scsirsp_pdus_cnt
++;
713 __iscsi_put_task(task
);
717 * iscsi_data_in_rsp - SCSI Data-In Response processing
718 * @conn: iscsi connection
720 * @task: scsi command task
723 iscsi_data_in_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
724 struct iscsi_task
*task
)
726 struct iscsi_data_rsp
*rhdr
= (struct iscsi_data_rsp
*)hdr
;
727 struct scsi_cmnd
*sc
= task
->sc
;
729 if (!(rhdr
->flags
& ISCSI_FLAG_DATA_STATUS
))
732 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
733 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
734 if (rhdr
->flags
& (ISCSI_FLAG_DATA_UNDERFLOW
|
735 ISCSI_FLAG_DATA_OVERFLOW
)) {
736 int res_count
= be32_to_cpu(rhdr
->residual_count
);
739 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
740 res_count
<= scsi_in(sc
)->length
))
741 scsi_in(sc
)->resid
= res_count
;
743 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
746 conn
->scsirsp_pdus_cnt
++;
747 __iscsi_put_task(task
);
750 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
752 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
754 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
755 conn
->tmfrsp_pdus_cnt
++;
757 if (conn
->tmf_state
!= TMF_QUEUED
)
760 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
761 conn
->tmf_state
= TMF_SUCCESS
;
762 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
763 conn
->tmf_state
= TMF_NOT_FOUND
;
765 conn
->tmf_state
= TMF_FAILED
;
766 wake_up(&conn
->ehwait
);
769 static void iscsi_send_nopout(struct iscsi_conn
*conn
, struct iscsi_nopin
*rhdr
)
771 struct iscsi_nopout hdr
;
772 struct iscsi_task
*task
;
774 if (!rhdr
&& conn
->ping_task
)
777 memset(&hdr
, 0, sizeof(struct iscsi_nopout
));
778 hdr
.opcode
= ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
;
779 hdr
.flags
= ISCSI_FLAG_CMD_FINAL
;
782 memcpy(hdr
.lun
, rhdr
->lun
, 8);
784 hdr
.itt
= RESERVED_ITT
;
786 hdr
.ttt
= RESERVED_ITT
;
788 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)&hdr
, NULL
, 0);
790 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send nopout\n");
792 /* only track our nops */
793 conn
->ping_task
= task
;
794 conn
->last_ping
= jiffies
;
798 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
799 char *data
, int datalen
)
801 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
802 struct iscsi_hdr rejected_pdu
;
804 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
806 if (reject
->reason
== ISCSI_REASON_DATA_DIGEST_ERROR
) {
807 if (ntoh24(reject
->dlength
) > datalen
)
808 return ISCSI_ERR_PROTO
;
810 if (ntoh24(reject
->dlength
) >= sizeof(struct iscsi_hdr
)) {
811 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
812 iscsi_conn_printk(KERN_ERR
, conn
,
813 "pdu (op 0x%x) rejected "
814 "due to DataDigest error.\n",
815 rejected_pdu
.opcode
);
822 * iscsi_itt_to_task - look up task by itt
823 * @conn: iscsi connection
826 * This should be used for mgmt tasks like login and nops, or if
827 * the LDD's itt space does not include the session age.
829 * The session lock must be held.
831 struct iscsi_task
*iscsi_itt_to_task(struct iscsi_conn
*conn
, itt_t itt
)
833 struct iscsi_session
*session
= conn
->session
;
836 if (itt
== RESERVED_ITT
)
839 if (session
->tt
->parse_pdu_itt
)
840 session
->tt
->parse_pdu_itt(conn
, itt
, &i
, NULL
);
843 if (i
>= session
->cmds_max
)
846 return session
->cmds
[i
];
848 EXPORT_SYMBOL_GPL(iscsi_itt_to_task
);
851 * __iscsi_complete_pdu - complete pdu
855 * @datalen: len of data buffer
857 * Completes pdu processing by freeing any resources allocated at
858 * queuecommand or send generic. session lock must be held and verify
859 * itt must have been called.
861 int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
862 char *data
, int datalen
)
864 struct iscsi_session
*session
= conn
->session
;
865 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
866 struct iscsi_task
*task
;
869 conn
->last_recv
= jiffies
;
870 rc
= iscsi_verify_itt(conn
, hdr
->itt
);
874 if (hdr
->itt
!= RESERVED_ITT
)
875 itt
= get_itt(hdr
->itt
);
879 ISCSI_DBG_SESSION(session
, "[op 0x%x cid %d itt 0x%x len %d]\n",
880 opcode
, conn
->id
, itt
, datalen
);
883 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
886 case ISCSI_OP_NOOP_IN
:
888 rc
= ISCSI_ERR_PROTO
;
892 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
895 iscsi_send_nopout(conn
, (struct iscsi_nopin
*)hdr
);
897 case ISCSI_OP_REJECT
:
898 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
900 case ISCSI_OP_ASYNC_EVENT
:
901 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
902 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
903 rc
= ISCSI_ERR_CONN_FAILED
;
906 rc
= ISCSI_ERR_BAD_OPCODE
;
913 case ISCSI_OP_SCSI_CMD_RSP
:
914 case ISCSI_OP_SCSI_DATA_IN
:
915 task
= iscsi_itt_to_ctask(conn
, hdr
->itt
);
917 return ISCSI_ERR_BAD_ITT
;
921 * LLD handles R2Ts if they need to.
924 case ISCSI_OP_LOGOUT_RSP
:
925 case ISCSI_OP_LOGIN_RSP
:
926 case ISCSI_OP_TEXT_RSP
:
927 case ISCSI_OP_SCSI_TMFUNC_RSP
:
928 case ISCSI_OP_NOOP_IN
:
929 task
= iscsi_itt_to_task(conn
, hdr
->itt
);
931 return ISCSI_ERR_BAD_ITT
;
934 return ISCSI_ERR_BAD_OPCODE
;
938 case ISCSI_OP_SCSI_CMD_RSP
:
939 iscsi_scsi_cmd_rsp(conn
, hdr
, task
, data
, datalen
);
941 case ISCSI_OP_SCSI_DATA_IN
:
942 iscsi_data_in_rsp(conn
, hdr
, task
);
944 case ISCSI_OP_LOGOUT_RSP
:
945 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
947 rc
= ISCSI_ERR_PROTO
;
950 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
952 case ISCSI_OP_LOGIN_RSP
:
953 case ISCSI_OP_TEXT_RSP
:
954 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
956 * login related PDU's exp_statsn is handled in
960 case ISCSI_OP_SCSI_TMFUNC_RSP
:
961 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
963 rc
= ISCSI_ERR_PROTO
;
967 iscsi_tmf_rsp(conn
, hdr
);
968 __iscsi_put_task(task
);
970 case ISCSI_OP_NOOP_IN
:
971 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
972 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) || datalen
) {
973 rc
= ISCSI_ERR_PROTO
;
976 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
978 if (conn
->ping_task
!= task
)
980 * If this is not in response to one of our
981 * nops then it must be from userspace.
985 mod_timer(&conn
->transport_timer
, jiffies
+ conn
->recv_timeout
);
986 __iscsi_put_task(task
);
989 rc
= ISCSI_ERR_BAD_OPCODE
;
996 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
997 rc
= ISCSI_ERR_CONN_FAILED
;
998 __iscsi_put_task(task
);
1001 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu
);
1003 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
1004 char *data
, int datalen
)
1008 spin_lock(&conn
->session
->lock
);
1009 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
1010 spin_unlock(&conn
->session
->lock
);
1013 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
1015 int iscsi_verify_itt(struct iscsi_conn
*conn
, itt_t itt
)
1017 struct iscsi_session
*session
= conn
->session
;
1020 if (itt
== RESERVED_ITT
)
1023 if (session
->tt
->parse_pdu_itt
)
1024 session
->tt
->parse_pdu_itt(conn
, itt
, &i
, &age
);
1027 age
= ((__force u32
)itt
>> ISCSI_AGE_SHIFT
) & ISCSI_AGE_MASK
;
1030 if (age
!= session
->age
) {
1031 iscsi_conn_printk(KERN_ERR
, conn
,
1032 "received itt %x expected session age (%x)\n",
1033 (__force u32
)itt
, session
->age
);
1034 return ISCSI_ERR_BAD_ITT
;
1037 if (i
>= session
->cmds_max
) {
1038 iscsi_conn_printk(KERN_ERR
, conn
,
1039 "received invalid itt index %u (max cmds "
1040 "%u.\n", i
, session
->cmds_max
);
1041 return ISCSI_ERR_BAD_ITT
;
1045 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
1048 * iscsi_itt_to_ctask - look up ctask by itt
1049 * @conn: iscsi connection
1052 * This should be used for cmd tasks.
1054 * The session lock must be held.
1056 struct iscsi_task
*iscsi_itt_to_ctask(struct iscsi_conn
*conn
, itt_t itt
)
1058 struct iscsi_task
*task
;
1060 if (iscsi_verify_itt(conn
, itt
))
1063 task
= iscsi_itt_to_task(conn
, itt
);
1064 if (!task
|| !task
->sc
)
1067 if (task
->sc
->SCp
.phase
!= conn
->session
->age
) {
1068 iscsi_session_printk(KERN_ERR
, conn
->session
,
1069 "task's session age %d, expected %d\n",
1070 task
->sc
->SCp
.phase
, conn
->session
->age
);
1076 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask
);
1078 void iscsi_session_failure(struct iscsi_session
*session
,
1081 struct iscsi_conn
*conn
;
1083 unsigned long flags
;
1085 spin_lock_irqsave(&session
->lock
, flags
);
1086 conn
= session
->leadconn
;
1087 if (session
->state
== ISCSI_STATE_TERMINATE
|| !conn
) {
1088 spin_unlock_irqrestore(&session
->lock
, flags
);
1092 dev
= get_device(&conn
->cls_conn
->dev
);
1093 spin_unlock_irqrestore(&session
->lock
, flags
);
1097 * if the host is being removed bypass the connection
1098 * recovery initialization because we are going to kill
1101 if (err
== ISCSI_ERR_INVALID_HOST
)
1102 iscsi_conn_error_event(conn
->cls_conn
, err
);
1104 iscsi_conn_failure(conn
, err
);
1107 EXPORT_SYMBOL_GPL(iscsi_session_failure
);
1109 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
1111 struct iscsi_session
*session
= conn
->session
;
1112 unsigned long flags
;
1114 spin_lock_irqsave(&session
->lock
, flags
);
1115 if (session
->state
== ISCSI_STATE_FAILED
) {
1116 spin_unlock_irqrestore(&session
->lock
, flags
);
1120 if (conn
->stop_stage
== 0)
1121 session
->state
= ISCSI_STATE_FAILED
;
1122 spin_unlock_irqrestore(&session
->lock
, flags
);
1124 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1125 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1126 iscsi_conn_error_event(conn
->cls_conn
, err
);
1128 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
1130 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn
*conn
)
1132 struct iscsi_session
*session
= conn
->session
;
1135 * Check for iSCSI window and take care of CmdSN wrap-around
1137 if (!iscsi_sna_lte(session
->queued_cmdsn
, session
->max_cmdsn
)) {
1138 ISCSI_DBG_SESSION(session
, "iSCSI CmdSN closed. ExpCmdSn "
1139 "%u MaxCmdSN %u CmdSN %u/%u\n",
1140 session
->exp_cmdsn
, session
->max_cmdsn
,
1141 session
->cmdsn
, session
->queued_cmdsn
);
1147 static int iscsi_xmit_task(struct iscsi_conn
*conn
)
1149 struct iscsi_task
*task
= conn
->task
;
1152 __iscsi_get_task(task
);
1153 spin_unlock_bh(&conn
->session
->lock
);
1154 rc
= conn
->session
->tt
->xmit_task(task
);
1155 spin_lock_bh(&conn
->session
->lock
);
1156 __iscsi_put_task(task
);
1158 /* done with this task */
1164 * iscsi_requeue_task - requeue task to run from session workqueue
1165 * @task: task to requeue
1167 * LLDs that need to run a task from the session workqueue should call
1168 * this. The session lock must be held. This should only be called
1169 * by software drivers.
1171 void iscsi_requeue_task(struct iscsi_task
*task
)
1173 struct iscsi_conn
*conn
= task
->conn
;
1175 list_move_tail(&task
->running
, &conn
->requeue
);
1176 iscsi_conn_queue_work(conn
);
1178 EXPORT_SYMBOL_GPL(iscsi_requeue_task
);
1181 * iscsi_data_xmit - xmit any command into the scheduled connection
1182 * @conn: iscsi connection
1185 * The function can return -EAGAIN in which case the caller must
1186 * re-schedule it again later or recover. '0' return code means
1189 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
1193 spin_lock_bh(&conn
->session
->lock
);
1194 if (unlikely(conn
->suspend_tx
)) {
1195 ISCSI_DBG_SESSION(conn
->session
, "Tx suspended!\n");
1196 spin_unlock_bh(&conn
->session
->lock
);
1201 rc
= iscsi_xmit_task(conn
);
1207 * process mgmt pdus like nops before commands since we should
1208 * only have one nop-out as a ping from us and targets should not
1209 * overflow us with nop-ins
1212 while (!list_empty(&conn
->mgmtqueue
)) {
1213 conn
->task
= list_entry(conn
->mgmtqueue
.next
,
1214 struct iscsi_task
, running
);
1215 if (iscsi_prep_mgmt_task(conn
, conn
->task
)) {
1216 __iscsi_put_task(conn
->task
);
1220 rc
= iscsi_xmit_task(conn
);
1225 /* process pending command queue */
1226 while (!list_empty(&conn
->xmitqueue
)) {
1227 if (conn
->tmf_state
== TMF_QUEUED
)
1230 conn
->task
= list_entry(conn
->xmitqueue
.next
,
1231 struct iscsi_task
, running
);
1232 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
1233 fail_command(conn
, conn
->task
, DID_IMM_RETRY
<< 16);
1236 rc
= iscsi_prep_scsi_cmd_pdu(conn
->task
);
1238 if (rc
== -ENOMEM
) {
1242 fail_command(conn
, conn
->task
, DID_ABORT
<< 16);
1245 rc
= iscsi_xmit_task(conn
);
1249 * we could continuously get new task requests so
1250 * we need to check the mgmt queue for nops that need to
1251 * be sent to aviod starvation
1253 if (!list_empty(&conn
->mgmtqueue
))
1257 while (!list_empty(&conn
->requeue
)) {
1258 if (conn
->session
->fast_abort
&& conn
->tmf_state
!= TMF_INITIAL
)
1262 * we always do fastlogout - conn stop code will clean up.
1264 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
1267 conn
->task
= list_entry(conn
->requeue
.next
,
1268 struct iscsi_task
, running
);
1269 conn
->task
->state
= ISCSI_TASK_RUNNING
;
1270 list_move_tail(conn
->requeue
.next
, &conn
->run_list
);
1271 rc
= iscsi_xmit_task(conn
);
1274 if (!list_empty(&conn
->mgmtqueue
))
1277 spin_unlock_bh(&conn
->session
->lock
);
1281 if (unlikely(conn
->suspend_tx
))
1283 spin_unlock_bh(&conn
->session
->lock
);
1287 static void iscsi_xmitworker(struct work_struct
*work
)
1289 struct iscsi_conn
*conn
=
1290 container_of(work
, struct iscsi_conn
, xmitwork
);
1293 * serialize Xmit worker on a per-connection basis.
1296 rc
= iscsi_data_xmit(conn
);
1297 } while (rc
>= 0 || rc
== -EAGAIN
);
1300 static inline struct iscsi_task
*iscsi_alloc_task(struct iscsi_conn
*conn
,
1301 struct scsi_cmnd
*sc
)
1303 struct iscsi_task
*task
;
1305 if (!__kfifo_get(conn
->session
->cmdpool
.queue
,
1306 (void *) &task
, sizeof(void *)))
1309 sc
->SCp
.phase
= conn
->session
->age
;
1310 sc
->SCp
.ptr
= (char *) task
;
1312 atomic_set(&task
->refcount
, 1);
1313 task
->state
= ISCSI_TASK_PENDING
;
1316 INIT_LIST_HEAD(&task
->running
);
1321 FAILURE_BAD_HOST
= 1,
1322 FAILURE_SESSION_FAILED
,
1323 FAILURE_SESSION_FREED
,
1324 FAILURE_WINDOW_CLOSED
,
1326 FAILURE_SESSION_TERMINATE
,
1327 FAILURE_SESSION_IN_RECOVERY
,
1328 FAILURE_SESSION_RECOVERY_TIMEOUT
,
1329 FAILURE_SESSION_LOGGING_OUT
,
1330 FAILURE_SESSION_NOT_READY
,
1333 int iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
1335 struct iscsi_cls_session
*cls_session
;
1336 struct Scsi_Host
*host
;
1338 struct iscsi_session
*session
;
1339 struct iscsi_conn
*conn
;
1340 struct iscsi_task
*task
= NULL
;
1342 sc
->scsi_done
= done
;
1346 host
= sc
->device
->host
;
1347 spin_unlock(host
->host_lock
);
1349 cls_session
= starget_to_session(scsi_target(sc
->device
));
1350 session
= cls_session
->dd_data
;
1351 spin_lock(&session
->lock
);
1353 reason
= iscsi_session_chkready(cls_session
);
1355 sc
->result
= reason
;
1360 * ISCSI_STATE_FAILED is a temp. state. The recovery
1361 * code will decide what is best to do with command queued
1364 if (session
->state
!= ISCSI_STATE_LOGGED_IN
&&
1365 session
->state
!= ISCSI_STATE_FAILED
) {
1367 * to handle the race between when we set the recovery state
1368 * and block the session we requeue here (commands could
1369 * be entering our queuecommand while a block is starting
1370 * up because the block code is not locked)
1372 switch (session
->state
) {
1373 case ISCSI_STATE_IN_RECOVERY
:
1374 reason
= FAILURE_SESSION_IN_RECOVERY
;
1376 case ISCSI_STATE_LOGGING_OUT
:
1377 reason
= FAILURE_SESSION_LOGGING_OUT
;
1379 case ISCSI_STATE_RECOVERY_FAILED
:
1380 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
1381 sc
->result
= DID_TRANSPORT_FAILFAST
<< 16;
1383 case ISCSI_STATE_TERMINATE
:
1384 reason
= FAILURE_SESSION_TERMINATE
;
1385 sc
->result
= DID_NO_CONNECT
<< 16;
1388 reason
= FAILURE_SESSION_FREED
;
1389 sc
->result
= DID_NO_CONNECT
<< 16;
1394 conn
= session
->leadconn
;
1396 reason
= FAILURE_SESSION_FREED
;
1397 sc
->result
= DID_NO_CONNECT
<< 16;
1401 if (iscsi_check_cmdsn_window_closed(conn
)) {
1402 reason
= FAILURE_WINDOW_CLOSED
;
1406 task
= iscsi_alloc_task(conn
, sc
);
1408 reason
= FAILURE_OOM
;
1411 list_add_tail(&task
->running
, &conn
->xmitqueue
);
1413 if (session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
) {
1414 reason
= iscsi_prep_scsi_cmd_pdu(task
);
1416 if (reason
== -ENOMEM
) {
1417 reason
= FAILURE_OOM
;
1420 sc
->result
= DID_ABORT
<< 16;
1424 if (session
->tt
->xmit_task(task
)) {
1425 reason
= FAILURE_SESSION_NOT_READY
;
1429 iscsi_conn_queue_work(conn
);
1431 session
->queued_cmdsn
++;
1432 spin_unlock(&session
->lock
);
1433 spin_lock(host
->host_lock
);
1437 sc
->scsi_done
= NULL
;
1438 iscsi_complete_command(task
);
1440 spin_unlock(&session
->lock
);
1441 ISCSI_DBG_SESSION(session
, "cmd 0x%x rejected (%d)\n",
1442 sc
->cmnd
[0], reason
);
1443 spin_lock(host
->host_lock
);
1444 return SCSI_MLQUEUE_TARGET_BUSY
;
1447 sc
->scsi_done
= NULL
;
1448 iscsi_complete_command(task
);
1450 spin_unlock(&session
->lock
);
1451 ISCSI_DBG_SESSION(session
, "iscsi: cmd 0x%x is not queued (%d)\n",
1452 sc
->cmnd
[0], reason
);
1453 if (!scsi_bidi_cmnd(sc
))
1454 scsi_set_resid(sc
, scsi_bufflen(sc
));
1456 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
1457 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
1460 spin_lock(host
->host_lock
);
1463 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
1465 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
)
1467 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
1468 return sdev
->queue_depth
;
1470 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
1472 int iscsi_target_alloc(struct scsi_target
*starget
)
1474 struct iscsi_cls_session
*cls_session
= starget_to_session(starget
);
1475 struct iscsi_session
*session
= cls_session
->dd_data
;
1477 starget
->can_queue
= session
->scsi_cmds_max
;
1480 EXPORT_SYMBOL_GPL(iscsi_target_alloc
);
1482 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
1484 struct iscsi_session
*session
= cls_session
->dd_data
;
1486 spin_lock_bh(&session
->lock
);
1487 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1488 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
1489 if (session
->leadconn
)
1490 wake_up(&session
->leadconn
->ehwait
);
1492 spin_unlock_bh(&session
->lock
);
1494 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
1496 int iscsi_eh_target_reset(struct scsi_cmnd
*sc
)
1498 struct iscsi_cls_session
*cls_session
;
1499 struct iscsi_session
*session
;
1500 struct iscsi_conn
*conn
;
1502 cls_session
= starget_to_session(scsi_target(sc
->device
));
1503 session
= cls_session
->dd_data
;
1504 conn
= session
->leadconn
;
1506 mutex_lock(&session
->eh_mutex
);
1507 spin_lock_bh(&session
->lock
);
1508 if (session
->state
== ISCSI_STATE_TERMINATE
) {
1510 iscsi_session_printk(KERN_INFO
, session
,
1511 "failing target reset: Could not log "
1512 "back into target [age %d]\n",
1514 spin_unlock_bh(&session
->lock
);
1515 mutex_unlock(&session
->eh_mutex
);
1519 spin_unlock_bh(&session
->lock
);
1520 mutex_unlock(&session
->eh_mutex
);
1522 * we drop the lock here but the leadconn cannot be destoyed while
1523 * we are in the scsi eh
1525 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1527 ISCSI_DBG_SESSION(session
, "wait for relogin\n");
1528 wait_event_interruptible(conn
->ehwait
,
1529 session
->state
== ISCSI_STATE_TERMINATE
||
1530 session
->state
== ISCSI_STATE_LOGGED_IN
||
1531 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
1532 if (signal_pending(current
))
1533 flush_signals(current
);
1535 mutex_lock(&session
->eh_mutex
);
1536 spin_lock_bh(&session
->lock
);
1537 if (session
->state
== ISCSI_STATE_LOGGED_IN
)
1538 iscsi_session_printk(KERN_INFO
, session
,
1539 "target reset succeeded\n");
1542 spin_unlock_bh(&session
->lock
);
1543 mutex_unlock(&session
->eh_mutex
);
1546 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset
);
1548 static void iscsi_tmf_timedout(unsigned long data
)
1550 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1551 struct iscsi_session
*session
= conn
->session
;
1553 spin_lock(&session
->lock
);
1554 if (conn
->tmf_state
== TMF_QUEUED
) {
1555 conn
->tmf_state
= TMF_TIMEDOUT
;
1556 ISCSI_DBG_SESSION(session
, "tmf timedout\n");
1557 /* unblock eh_abort() */
1558 wake_up(&conn
->ehwait
);
1560 spin_unlock(&session
->lock
);
1563 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn
*conn
,
1564 struct iscsi_tm
*hdr
, int age
,
1567 struct iscsi_session
*session
= conn
->session
;
1568 struct iscsi_task
*task
;
1570 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)hdr
,
1573 spin_unlock_bh(&session
->lock
);
1574 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1575 spin_lock_bh(&session
->lock
);
1576 ISCSI_DBG_SESSION(session
, "tmf exec failure\n");
1579 conn
->tmfcmd_pdus_cnt
++;
1580 conn
->tmf_timer
.expires
= timeout
* HZ
+ jiffies
;
1581 conn
->tmf_timer
.function
= iscsi_tmf_timedout
;
1582 conn
->tmf_timer
.data
= (unsigned long)conn
;
1583 add_timer(&conn
->tmf_timer
);
1584 ISCSI_DBG_SESSION(session
, "tmf set timeout\n");
1586 spin_unlock_bh(&session
->lock
);
1587 mutex_unlock(&session
->eh_mutex
);
1590 * block eh thread until:
1594 * 3) session is terminated or restarted or userspace has
1595 * given up on recovery
1597 wait_event_interruptible(conn
->ehwait
, age
!= session
->age
||
1598 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1599 conn
->tmf_state
!= TMF_QUEUED
);
1600 if (signal_pending(current
))
1601 flush_signals(current
);
1602 del_timer_sync(&conn
->tmf_timer
);
1604 mutex_lock(&session
->eh_mutex
);
1605 spin_lock_bh(&session
->lock
);
1606 /* if the session drops it will clean up the task */
1607 if (age
!= session
->age
||
1608 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1614 * Fail commands. session lock held and recv side suspended and xmit
1617 static void fail_all_commands(struct iscsi_conn
*conn
, unsigned lun
,
1620 struct iscsi_task
*task
, *tmp
;
1624 (conn
->task
->sc
&& conn
->task
->sc
->device
->lun
== lun
))
1629 list_for_each_entry_safe(task
, tmp
, &conn
->xmitqueue
, running
) {
1630 if (lun
== task
->sc
->device
->lun
|| lun
== -1) {
1631 ISCSI_DBG_SESSION(conn
->session
,
1632 "failing pending sc %p itt 0x%x\n",
1633 task
->sc
, task
->itt
);
1634 fail_command(conn
, task
, error
<< 16);
1638 list_for_each_entry_safe(task
, tmp
, &conn
->requeue
, running
) {
1639 if (lun
== task
->sc
->device
->lun
|| lun
== -1) {
1640 ISCSI_DBG_SESSION(conn
->session
,
1641 "failing requeued sc %p itt 0x%x\n",
1642 task
->sc
, task
->itt
);
1643 fail_command(conn
, task
, error
<< 16);
1647 /* fail all other running */
1648 list_for_each_entry_safe(task
, tmp
, &conn
->run_list
, running
) {
1649 if (lun
== task
->sc
->device
->lun
|| lun
== -1) {
1650 ISCSI_DBG_SESSION(conn
->session
,
1651 "failing in progress sc %p itt 0x%x\n",
1652 task
->sc
, task
->itt
);
1653 fail_command(conn
, task
, error
<< 16);
1658 void iscsi_suspend_tx(struct iscsi_conn
*conn
)
1660 struct Scsi_Host
*shost
= conn
->session
->host
;
1661 struct iscsi_host
*ihost
= shost_priv(shost
);
1663 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1664 if (!(conn
->session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
1665 flush_workqueue(ihost
->workq
);
1667 EXPORT_SYMBOL_GPL(iscsi_suspend_tx
);
1669 static void iscsi_start_tx(struct iscsi_conn
*conn
)
1671 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1672 if (!(conn
->session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
1673 iscsi_conn_queue_work(conn
);
1676 static enum blk_eh_timer_return
iscsi_eh_cmd_timed_out(struct scsi_cmnd
*scmd
)
1678 struct iscsi_cls_session
*cls_session
;
1679 struct iscsi_session
*session
;
1680 struct iscsi_conn
*conn
;
1681 enum blk_eh_timer_return rc
= BLK_EH_NOT_HANDLED
;
1683 cls_session
= starget_to_session(scsi_target(scmd
->device
));
1684 session
= cls_session
->dd_data
;
1686 ISCSI_DBG_SESSION(session
, "scsi cmd %p timedout\n", scmd
);
1688 spin_lock(&session
->lock
);
1689 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1691 * We are probably in the middle of iscsi recovery so let
1692 * that complete and handle the error.
1694 rc
= BLK_EH_RESET_TIMER
;
1698 conn
= session
->leadconn
;
1700 /* In the middle of shuting down */
1701 rc
= BLK_EH_RESET_TIMER
;
1705 if (!conn
->recv_timeout
&& !conn
->ping_timeout
)
1708 * if the ping timedout then we are in the middle of cleaning up
1709 * and can let the iscsi eh handle it
1711 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
) +
1712 (conn
->ping_timeout
* HZ
), jiffies
))
1713 rc
= BLK_EH_RESET_TIMER
;
1715 * if we are about to check the transport then give the command
1718 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
),
1720 rc
= BLK_EH_RESET_TIMER
;
1721 /* if in the middle of checking the transport then give us more time */
1722 if (conn
->ping_task
)
1723 rc
= BLK_EH_RESET_TIMER
;
1725 spin_unlock(&session
->lock
);
1726 ISCSI_DBG_SESSION(session
, "return %s\n", rc
== BLK_EH_RESET_TIMER
?
1727 "timer reset" : "nh");
1731 static void iscsi_check_transport_timeouts(unsigned long data
)
1733 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1734 struct iscsi_session
*session
= conn
->session
;
1735 unsigned long recv_timeout
, next_timeout
= 0, last_recv
;
1737 spin_lock(&session
->lock
);
1738 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
1741 recv_timeout
= conn
->recv_timeout
;
1746 last_recv
= conn
->last_recv
;
1747 if (conn
->ping_task
&&
1748 time_before_eq(conn
->last_ping
+ (conn
->ping_timeout
* HZ
),
1750 iscsi_conn_printk(KERN_ERR
, conn
, "ping timeout of %d secs "
1751 "expired, last rx %lu, last ping %lu, "
1752 "now %lu\n", conn
->ping_timeout
, last_recv
,
1753 conn
->last_ping
, jiffies
);
1754 spin_unlock(&session
->lock
);
1755 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1759 if (time_before_eq(last_recv
+ recv_timeout
, jiffies
)) {
1760 /* send a ping to try to provoke some traffic */
1761 ISCSI_DBG_CONN(conn
, "Sending nopout as ping\n");
1762 iscsi_send_nopout(conn
, NULL
);
1763 next_timeout
= conn
->last_ping
+ (conn
->ping_timeout
* HZ
);
1765 next_timeout
= last_recv
+ recv_timeout
;
1767 ISCSI_DBG_CONN(conn
, "Setting next tmo %lu\n", next_timeout
);
1768 mod_timer(&conn
->transport_timer
, next_timeout
);
1770 spin_unlock(&session
->lock
);
1773 static void iscsi_prep_abort_task_pdu(struct iscsi_task
*task
,
1774 struct iscsi_tm
*hdr
)
1776 memset(hdr
, 0, sizeof(*hdr
));
1777 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1778 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
& ISCSI_FLAG_TM_FUNC_MASK
;
1779 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1780 memcpy(hdr
->lun
, task
->lun
, sizeof(hdr
->lun
));
1781 hdr
->rtt
= task
->hdr_itt
;
1782 hdr
->refcmdsn
= task
->cmdsn
;
1785 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
1787 struct iscsi_cls_session
*cls_session
;
1788 struct iscsi_session
*session
;
1789 struct iscsi_conn
*conn
;
1790 struct iscsi_task
*task
;
1791 struct iscsi_tm
*hdr
;
1794 cls_session
= starget_to_session(scsi_target(sc
->device
));
1795 session
= cls_session
->dd_data
;
1797 mutex_lock(&session
->eh_mutex
);
1798 spin_lock_bh(&session
->lock
);
1800 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1804 ISCSI_DBG_SESSION(session
, "sc never reached iscsi layer or "
1806 spin_unlock_bh(&session
->lock
);
1807 mutex_unlock(&session
->eh_mutex
);
1812 * If we are not logged in or we have started a new session
1813 * then let the host reset code handle this
1815 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
||
1816 sc
->SCp
.phase
!= session
->age
) {
1817 spin_unlock_bh(&session
->lock
);
1818 mutex_unlock(&session
->eh_mutex
);
1822 conn
= session
->leadconn
;
1823 conn
->eh_abort_cnt
++;
1826 task
= (struct iscsi_task
*)sc
->SCp
.ptr
;
1827 ISCSI_DBG_SESSION(session
, "aborting [sc %p itt 0x%x]\n",
1830 /* task completed before time out */
1832 ISCSI_DBG_SESSION(session
, "sc completed while abort in "
1837 if (task
->state
== ISCSI_TASK_PENDING
) {
1838 fail_command(conn
, task
, DID_ABORT
<< 16);
1842 /* only have one tmf outstanding at a time */
1843 if (conn
->tmf_state
!= TMF_INITIAL
)
1845 conn
->tmf_state
= TMF_QUEUED
;
1848 iscsi_prep_abort_task_pdu(task
, hdr
);
1850 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, age
, session
->abort_timeout
)) {
1855 switch (conn
->tmf_state
) {
1857 spin_unlock_bh(&session
->lock
);
1859 * stop tx side incase the target had sent a abort rsp but
1860 * the initiator was still writing out data.
1862 iscsi_suspend_tx(conn
);
1864 * we do not stop the recv side because targets have been
1865 * good and have never sent us a successful tmf response
1866 * then sent more data for the cmd.
1868 spin_lock(&session
->lock
);
1869 fail_command(conn
, task
, DID_ABORT
<< 16);
1870 conn
->tmf_state
= TMF_INITIAL
;
1871 spin_unlock(&session
->lock
);
1872 iscsi_start_tx(conn
);
1873 goto success_unlocked
;
1875 spin_unlock_bh(&session
->lock
);
1876 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1877 goto failed_unlocked
;
1880 conn
->tmf_state
= TMF_INITIAL
;
1881 /* task completed before tmf abort response */
1882 ISCSI_DBG_SESSION(session
, "sc completed while abort "
1888 conn
->tmf_state
= TMF_INITIAL
;
1893 spin_unlock_bh(&session
->lock
);
1895 ISCSI_DBG_SESSION(session
, "abort success [sc %p itt 0x%x]\n",
1897 mutex_unlock(&session
->eh_mutex
);
1901 spin_unlock_bh(&session
->lock
);
1903 ISCSI_DBG_SESSION(session
, "abort failed [sc %p itt 0x%x]\n", sc
,
1904 task
? task
->itt
: 0);
1905 mutex_unlock(&session
->eh_mutex
);
1908 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
1910 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
1912 memset(hdr
, 0, sizeof(*hdr
));
1913 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1914 hdr
->flags
= ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
1915 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1916 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
1917 hdr
->rtt
= RESERVED_ITT
;
1920 int iscsi_eh_device_reset(struct scsi_cmnd
*sc
)
1922 struct iscsi_cls_session
*cls_session
;
1923 struct iscsi_session
*session
;
1924 struct iscsi_conn
*conn
;
1925 struct iscsi_tm
*hdr
;
1928 cls_session
= starget_to_session(scsi_target(sc
->device
));
1929 session
= cls_session
->dd_data
;
1931 ISCSI_DBG_SESSION(session
, "LU Reset [sc %p lun %u]\n",
1932 sc
, sc
->device
->lun
);
1934 mutex_lock(&session
->eh_mutex
);
1935 spin_lock_bh(&session
->lock
);
1937 * Just check if we are not logged in. We cannot check for
1938 * the phase because the reset could come from a ioctl.
1940 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
1942 conn
= session
->leadconn
;
1944 /* only have one tmf outstanding at a time */
1945 if (conn
->tmf_state
!= TMF_INITIAL
)
1947 conn
->tmf_state
= TMF_QUEUED
;
1950 iscsi_prep_lun_reset_pdu(sc
, hdr
);
1952 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
1953 session
->lu_reset_timeout
)) {
1958 switch (conn
->tmf_state
) {
1962 spin_unlock_bh(&session
->lock
);
1963 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1966 conn
->tmf_state
= TMF_INITIAL
;
1971 spin_unlock_bh(&session
->lock
);
1973 iscsi_suspend_tx(conn
);
1975 spin_lock_bh(&session
->lock
);
1976 fail_all_commands(conn
, sc
->device
->lun
, DID_ERROR
);
1977 conn
->tmf_state
= TMF_INITIAL
;
1978 spin_unlock_bh(&session
->lock
);
1980 iscsi_start_tx(conn
);
1984 spin_unlock_bh(&session
->lock
);
1986 ISCSI_DBG_SESSION(session
, "dev reset result = %s\n",
1987 rc
== SUCCESS
? "SUCCESS" : "FAILED");
1988 mutex_unlock(&session
->eh_mutex
);
1991 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset
);
1994 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1995 * should be accessed via kfifo_{get,put} on q->queue.
1996 * Optionally, the caller can obtain the array of object pointers
1997 * by passing in a non-NULL @items pointer
2000 iscsi_pool_init(struct iscsi_pool
*q
, int max
, void ***items
, int item_size
)
2002 int i
, num_arrays
= 1;
2004 memset(q
, 0, sizeof(*q
));
2008 /* If the user passed an items pointer, he wants a copy of
2012 q
->pool
= kzalloc(num_arrays
* max
* sizeof(void*), GFP_KERNEL
);
2013 if (q
->pool
== NULL
)
2016 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
2018 if (IS_ERR(q
->queue
)) {
2023 for (i
= 0; i
< max
; i
++) {
2024 q
->pool
[i
] = kzalloc(item_size
, GFP_KERNEL
);
2025 if (q
->pool
[i
] == NULL
) {
2029 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
2033 *items
= q
->pool
+ max
;
2034 memcpy(*items
, q
->pool
, max
* sizeof(void *));
2043 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
2045 void iscsi_pool_free(struct iscsi_pool
*q
)
2049 for (i
= 0; i
< q
->max
; i
++)
2054 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
2057 * iscsi_host_add - add host to system
2059 * @pdev: parent device
2061 * This should be called by partial offload and software iscsi drivers
2062 * to add a host to the system.
2064 int iscsi_host_add(struct Scsi_Host
*shost
, struct device
*pdev
)
2066 if (!shost
->can_queue
)
2067 shost
->can_queue
= ISCSI_DEF_XMIT_CMDS_MAX
;
2069 if (!shost
->cmd_per_lun
)
2070 shost
->cmd_per_lun
= ISCSI_DEF_CMD_PER_LUN
;
2072 if (!shost
->transportt
->eh_timed_out
)
2073 shost
->transportt
->eh_timed_out
= iscsi_eh_cmd_timed_out
;
2074 return scsi_add_host(shost
, pdev
);
2076 EXPORT_SYMBOL_GPL(iscsi_host_add
);
2079 * iscsi_host_alloc - allocate a host and driver data
2080 * @sht: scsi host template
2081 * @dd_data_size: driver host data size
2082 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2084 * This should be called by partial offload and software iscsi drivers.
2085 * To access the driver specific memory use the iscsi_host_priv() macro.
2087 struct Scsi_Host
*iscsi_host_alloc(struct scsi_host_template
*sht
,
2088 int dd_data_size
, bool xmit_can_sleep
)
2090 struct Scsi_Host
*shost
;
2091 struct iscsi_host
*ihost
;
2093 shost
= scsi_host_alloc(sht
, sizeof(struct iscsi_host
) + dd_data_size
);
2096 ihost
= shost_priv(shost
);
2098 if (xmit_can_sleep
) {
2099 snprintf(ihost
->workq_name
, sizeof(ihost
->workq_name
),
2100 "iscsi_q_%d", shost
->host_no
);
2101 ihost
->workq
= create_singlethread_workqueue(ihost
->workq_name
);
2106 spin_lock_init(&ihost
->lock
);
2107 ihost
->state
= ISCSI_HOST_SETUP
;
2108 ihost
->num_sessions
= 0;
2109 init_waitqueue_head(&ihost
->session_removal_wq
);
2113 scsi_host_put(shost
);
2116 EXPORT_SYMBOL_GPL(iscsi_host_alloc
);
2118 static void iscsi_notify_host_removed(struct iscsi_cls_session
*cls_session
)
2120 iscsi_session_failure(cls_session
->dd_data
, ISCSI_ERR_INVALID_HOST
);
2124 * iscsi_host_remove - remove host and sessions
2127 * If there are any sessions left, this will initiate the removal and wait
2128 * for the completion.
2130 void iscsi_host_remove(struct Scsi_Host
*shost
)
2132 struct iscsi_host
*ihost
= shost_priv(shost
);
2133 unsigned long flags
;
2135 spin_lock_irqsave(&ihost
->lock
, flags
);
2136 ihost
->state
= ISCSI_HOST_REMOVED
;
2137 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2139 iscsi_host_for_each_session(shost
, iscsi_notify_host_removed
);
2140 wait_event_interruptible(ihost
->session_removal_wq
,
2141 ihost
->num_sessions
== 0);
2142 if (signal_pending(current
))
2143 flush_signals(current
);
2145 scsi_remove_host(shost
);
2147 destroy_workqueue(ihost
->workq
);
2149 EXPORT_SYMBOL_GPL(iscsi_host_remove
);
2151 void iscsi_host_free(struct Scsi_Host
*shost
)
2153 struct iscsi_host
*ihost
= shost_priv(shost
);
2155 kfree(ihost
->netdev
);
2156 kfree(ihost
->hwaddress
);
2157 kfree(ihost
->initiatorname
);
2158 scsi_host_put(shost
);
2160 EXPORT_SYMBOL_GPL(iscsi_host_free
);
2162 static void iscsi_host_dec_session_cnt(struct Scsi_Host
*shost
)
2164 struct iscsi_host
*ihost
= shost_priv(shost
);
2165 unsigned long flags
;
2167 shost
= scsi_host_get(shost
);
2169 printk(KERN_ERR
"Invalid state. Cannot notify host removal "
2170 "of session teardown event because host already "
2175 spin_lock_irqsave(&ihost
->lock
, flags
);
2176 ihost
->num_sessions
--;
2177 if (ihost
->num_sessions
== 0)
2178 wake_up(&ihost
->session_removal_wq
);
2179 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2180 scsi_host_put(shost
);
2184 * iscsi_session_setup - create iscsi cls session and host and session
2185 * @iscsit: iscsi transport template
2187 * @cmds_max: session can queue
2188 * @cmd_task_size: LLD task private data size
2189 * @initial_cmdsn: initial CmdSN
2191 * This can be used by software iscsi_transports that allocate
2192 * a session per scsi host.
2194 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2195 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2196 * for nop handling and login/logout requests.
2198 struct iscsi_cls_session
*
2199 iscsi_session_setup(struct iscsi_transport
*iscsit
, struct Scsi_Host
*shost
,
2200 uint16_t cmds_max
, int cmd_task_size
,
2201 uint32_t initial_cmdsn
, unsigned int id
)
2203 struct iscsi_host
*ihost
= shost_priv(shost
);
2204 struct iscsi_session
*session
;
2205 struct iscsi_cls_session
*cls_session
;
2206 int cmd_i
, scsi_cmds
, total_cmds
= cmds_max
;
2207 unsigned long flags
;
2209 spin_lock_irqsave(&ihost
->lock
, flags
);
2210 if (ihost
->state
== ISCSI_HOST_REMOVED
) {
2211 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2214 ihost
->num_sessions
++;
2215 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2218 total_cmds
= ISCSI_DEF_XMIT_CMDS_MAX
;
2220 * The iscsi layer needs some tasks for nop handling and tmfs,
2221 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2222 * + 1 command for scsi IO.
2224 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
) {
2225 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2226 "must be a power of two that is at least %d.\n",
2227 total_cmds
, ISCSI_TOTAL_CMDS_MIN
);
2228 goto dec_session_count
;
2231 if (total_cmds
> ISCSI_TOTAL_CMDS_MAX
) {
2232 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2233 "must be a power of 2 less than or equal to %d.\n",
2234 cmds_max
, ISCSI_TOTAL_CMDS_MAX
);
2235 total_cmds
= ISCSI_TOTAL_CMDS_MAX
;
2238 if (!is_power_of_2(total_cmds
)) {
2239 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2240 "must be a power of 2.\n", total_cmds
);
2241 total_cmds
= rounddown_pow_of_two(total_cmds
);
2242 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
)
2244 printk(KERN_INFO
"iscsi: Rounding can_queue to %d.\n",
2247 scsi_cmds
= total_cmds
- ISCSI_MGMT_CMDS_MAX
;
2249 cls_session
= iscsi_alloc_session(shost
, iscsit
,
2250 sizeof(struct iscsi_session
));
2252 goto dec_session_count
;
2253 session
= cls_session
->dd_data
;
2254 session
->cls_session
= cls_session
;
2255 session
->host
= shost
;
2256 session
->state
= ISCSI_STATE_FREE
;
2257 session
->fast_abort
= 1;
2258 session
->lu_reset_timeout
= 15;
2259 session
->abort_timeout
= 10;
2260 session
->scsi_cmds_max
= scsi_cmds
;
2261 session
->cmds_max
= total_cmds
;
2262 session
->queued_cmdsn
= session
->cmdsn
= initial_cmdsn
;
2263 session
->exp_cmdsn
= initial_cmdsn
+ 1;
2264 session
->max_cmdsn
= initial_cmdsn
+ 1;
2265 session
->max_r2t
= 1;
2266 session
->tt
= iscsit
;
2267 mutex_init(&session
->eh_mutex
);
2268 spin_lock_init(&session
->lock
);
2270 /* initialize SCSI PDU commands pool */
2271 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
2272 (void***)&session
->cmds
,
2273 cmd_task_size
+ sizeof(struct iscsi_task
)))
2274 goto cmdpool_alloc_fail
;
2276 /* pre-format cmds pool with ITT */
2277 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
2278 struct iscsi_task
*task
= session
->cmds
[cmd_i
];
2281 task
->dd_data
= &task
[1];
2283 INIT_LIST_HEAD(&task
->running
);
2286 if (!try_module_get(iscsit
->owner
))
2287 goto module_get_fail
;
2289 if (iscsi_add_session(cls_session
, id
))
2290 goto cls_session_fail
;
2295 module_put(iscsit
->owner
);
2297 iscsi_pool_free(&session
->cmdpool
);
2299 iscsi_free_session(cls_session
);
2301 iscsi_host_dec_session_cnt(shost
);
2304 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
2307 * iscsi_session_teardown - destroy session, host, and cls_session
2308 * @cls_session: iscsi session
2310 * The driver must have called iscsi_remove_session before
2313 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
2315 struct iscsi_session
*session
= cls_session
->dd_data
;
2316 struct module
*owner
= cls_session
->transport
->owner
;
2317 struct Scsi_Host
*shost
= session
->host
;
2319 iscsi_pool_free(&session
->cmdpool
);
2321 kfree(session
->password
);
2322 kfree(session
->password_in
);
2323 kfree(session
->username
);
2324 kfree(session
->username_in
);
2325 kfree(session
->targetname
);
2326 kfree(session
->initiatorname
);
2327 kfree(session
->ifacename
);
2329 iscsi_destroy_session(cls_session
);
2330 iscsi_host_dec_session_cnt(shost
);
2333 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
2336 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2337 * @cls_session: iscsi_cls_session
2338 * @dd_size: private driver data size
2341 struct iscsi_cls_conn
*
2342 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, int dd_size
,
2345 struct iscsi_session
*session
= cls_session
->dd_data
;
2346 struct iscsi_conn
*conn
;
2347 struct iscsi_cls_conn
*cls_conn
;
2350 cls_conn
= iscsi_create_conn(cls_session
, sizeof(*conn
) + dd_size
,
2354 conn
= cls_conn
->dd_data
;
2355 memset(conn
, 0, sizeof(*conn
) + dd_size
);
2357 conn
->dd_data
= cls_conn
->dd_data
+ sizeof(*conn
);
2358 conn
->session
= session
;
2359 conn
->cls_conn
= cls_conn
;
2360 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
2361 conn
->id
= conn_idx
;
2362 conn
->exp_statsn
= 0;
2363 conn
->tmf_state
= TMF_INITIAL
;
2365 init_timer(&conn
->transport_timer
);
2366 conn
->transport_timer
.data
= (unsigned long)conn
;
2367 conn
->transport_timer
.function
= iscsi_check_transport_timeouts
;
2369 INIT_LIST_HEAD(&conn
->run_list
);
2370 INIT_LIST_HEAD(&conn
->mgmt_run_list
);
2371 INIT_LIST_HEAD(&conn
->mgmtqueue
);
2372 INIT_LIST_HEAD(&conn
->xmitqueue
);
2373 INIT_LIST_HEAD(&conn
->requeue
);
2374 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
2376 /* allocate login_task used for the login/text sequences */
2377 spin_lock_bh(&session
->lock
);
2378 if (!__kfifo_get(session
->cmdpool
.queue
,
2379 (void*)&conn
->login_task
,
2381 spin_unlock_bh(&session
->lock
);
2382 goto login_task_alloc_fail
;
2384 spin_unlock_bh(&session
->lock
);
2386 data
= (char *) __get_free_pages(GFP_KERNEL
,
2387 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN
));
2389 goto login_task_data_alloc_fail
;
2390 conn
->login_task
->data
= conn
->data
= data
;
2392 init_timer(&conn
->tmf_timer
);
2393 init_waitqueue_head(&conn
->ehwait
);
2397 login_task_data_alloc_fail
:
2398 __kfifo_put(session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2400 login_task_alloc_fail
:
2401 iscsi_destroy_conn(cls_conn
);
2404 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
2407 * iscsi_conn_teardown - teardown iscsi connection
2408 * cls_conn: iscsi class connection
2410 * TODO: we may need to make this into a two step process
2411 * like scsi-mls remove + put host
2413 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
2415 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2416 struct iscsi_session
*session
= conn
->session
;
2417 unsigned long flags
;
2419 del_timer_sync(&conn
->transport_timer
);
2421 spin_lock_bh(&session
->lock
);
2422 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
2423 if (session
->leadconn
== conn
) {
2425 * leading connection? then give up on recovery.
2427 session
->state
= ISCSI_STATE_TERMINATE
;
2428 wake_up(&conn
->ehwait
);
2430 spin_unlock_bh(&session
->lock
);
2433 * Block until all in-progress commands for this connection
2437 spin_lock_irqsave(session
->host
->host_lock
, flags
);
2438 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
2439 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2442 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2443 msleep_interruptible(500);
2444 iscsi_conn_printk(KERN_INFO
, conn
, "iscsi conn_destroy(): "
2445 "host_busy %d host_failed %d\n",
2446 session
->host
->host_busy
,
2447 session
->host
->host_failed
);
2449 * force eh_abort() to unblock
2451 wake_up(&conn
->ehwait
);
2454 /* flush queued up work because we free the connection below */
2455 iscsi_suspend_tx(conn
);
2457 spin_lock_bh(&session
->lock
);
2458 free_pages((unsigned long) conn
->data
,
2459 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN
));
2460 kfree(conn
->persistent_address
);
2461 __kfifo_put(session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2463 if (session
->leadconn
== conn
)
2464 session
->leadconn
= NULL
;
2465 spin_unlock_bh(&session
->lock
);
2467 iscsi_destroy_conn(cls_conn
);
2469 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
2471 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
2473 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2474 struct iscsi_session
*session
= conn
->session
;
2477 iscsi_conn_printk(KERN_ERR
, conn
,
2478 "can't start unbound connection\n");
2482 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
2483 session
->first_burst
> session
->max_burst
) {
2484 iscsi_conn_printk(KERN_INFO
, conn
, "invalid burst lengths: "
2485 "first_burst %d max_burst %d\n",
2486 session
->first_burst
, session
->max_burst
);
2490 if (conn
->ping_timeout
&& !conn
->recv_timeout
) {
2491 iscsi_conn_printk(KERN_ERR
, conn
, "invalid recv timeout of "
2492 "zero. Using 5 seconds\n.");
2493 conn
->recv_timeout
= 5;
2496 if (conn
->recv_timeout
&& !conn
->ping_timeout
) {
2497 iscsi_conn_printk(KERN_ERR
, conn
, "invalid ping timeout of "
2498 "zero. Using 5 seconds.\n");
2499 conn
->ping_timeout
= 5;
2502 spin_lock_bh(&session
->lock
);
2503 conn
->c_stage
= ISCSI_CONN_STARTED
;
2504 session
->state
= ISCSI_STATE_LOGGED_IN
;
2505 session
->queued_cmdsn
= session
->cmdsn
;
2507 conn
->last_recv
= jiffies
;
2508 conn
->last_ping
= jiffies
;
2509 if (conn
->recv_timeout
&& conn
->ping_timeout
)
2510 mod_timer(&conn
->transport_timer
,
2511 jiffies
+ (conn
->recv_timeout
* HZ
));
2513 switch(conn
->stop_stage
) {
2514 case STOP_CONN_RECOVER
:
2516 * unblock eh_abort() if it is blocked. re-try all
2517 * commands after successful recovery
2519 conn
->stop_stage
= 0;
2520 conn
->tmf_state
= TMF_INITIAL
;
2522 if (session
->age
== 16)
2525 case STOP_CONN_TERM
:
2526 conn
->stop_stage
= 0;
2531 spin_unlock_bh(&session
->lock
);
2533 iscsi_unblock_session(session
->cls_session
);
2534 wake_up(&conn
->ehwait
);
2537 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
2540 flush_control_queues(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
2542 struct iscsi_task
*task
, *tmp
;
2544 /* handle pending */
2545 list_for_each_entry_safe(task
, tmp
, &conn
->mgmtqueue
, running
) {
2546 ISCSI_DBG_SESSION(session
, "flushing pending mgmt task "
2547 "itt 0x%x\n", task
->itt
);
2548 /* release ref from prep task */
2549 __iscsi_put_task(task
);
2552 /* handle running */
2553 list_for_each_entry_safe(task
, tmp
, &conn
->mgmt_run_list
, running
) {
2554 ISCSI_DBG_SESSION(session
, "flushing running mgmt task "
2555 "itt 0x%x\n", task
->itt
);
2556 /* release ref from prep task */
2557 __iscsi_put_task(task
);
2563 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
2564 struct iscsi_conn
*conn
, int flag
)
2568 del_timer_sync(&conn
->transport_timer
);
2570 mutex_lock(&session
->eh_mutex
);
2571 spin_lock_bh(&session
->lock
);
2572 if (conn
->stop_stage
== STOP_CONN_TERM
) {
2573 spin_unlock_bh(&session
->lock
);
2574 mutex_unlock(&session
->eh_mutex
);
2579 * When this is called for the in_login state, we only want to clean
2580 * up the login task and connection. We do not need to block and set
2581 * the recovery state again
2583 if (flag
== STOP_CONN_TERM
)
2584 session
->state
= ISCSI_STATE_TERMINATE
;
2585 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
2586 session
->state
= ISCSI_STATE_IN_RECOVERY
;
2588 old_stop_stage
= conn
->stop_stage
;
2589 conn
->stop_stage
= flag
;
2590 conn
->c_stage
= ISCSI_CONN_STOPPED
;
2591 spin_unlock_bh(&session
->lock
);
2593 iscsi_suspend_tx(conn
);
2595 * for connection level recovery we should not calculate
2596 * header digest. conn->hdr_size used for optimization
2597 * in hdr_extract() and will be re-negotiated at
2600 if (flag
== STOP_CONN_RECOVER
) {
2601 conn
->hdrdgst_en
= 0;
2602 conn
->datadgst_en
= 0;
2603 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
2604 old_stop_stage
!= STOP_CONN_RECOVER
) {
2605 ISCSI_DBG_SESSION(session
, "blocking session\n");
2606 iscsi_block_session(session
->cls_session
);
2613 spin_lock_bh(&session
->lock
);
2614 if (flag
== STOP_CONN_RECOVER
)
2615 fail_all_commands(conn
, -1, DID_TRANSPORT_DISRUPTED
);
2617 fail_all_commands(conn
, -1, DID_ERROR
);
2618 flush_control_queues(session
, conn
);
2619 spin_unlock_bh(&session
->lock
);
2620 mutex_unlock(&session
->eh_mutex
);
2623 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
2625 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2626 struct iscsi_session
*session
= conn
->session
;
2629 case STOP_CONN_RECOVER
:
2630 case STOP_CONN_TERM
:
2631 iscsi_start_session_recovery(session
, conn
, flag
);
2634 iscsi_conn_printk(KERN_ERR
, conn
,
2635 "invalid stop flag %d\n", flag
);
2638 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
2640 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
2641 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
2643 struct iscsi_session
*session
= cls_session
->dd_data
;
2644 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2646 spin_lock_bh(&session
->lock
);
2648 session
->leadconn
= conn
;
2649 spin_unlock_bh(&session
->lock
);
2652 * Unblock xmitworker(), Login Phase will pass through.
2654 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
2655 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
2658 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
2660 static int iscsi_switch_str_param(char **param
, char *new_val_buf
)
2665 if (!strcmp(*param
, new_val_buf
))
2669 new_val
= kstrdup(new_val_buf
, GFP_NOIO
);
2678 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
2679 enum iscsi_param param
, char *buf
, int buflen
)
2681 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2682 struct iscsi_session
*session
= conn
->session
;
2686 case ISCSI_PARAM_FAST_ABORT
:
2687 sscanf(buf
, "%d", &session
->fast_abort
);
2689 case ISCSI_PARAM_ABORT_TMO
:
2690 sscanf(buf
, "%d", &session
->abort_timeout
);
2692 case ISCSI_PARAM_LU_RESET_TMO
:
2693 sscanf(buf
, "%d", &session
->lu_reset_timeout
);
2695 case ISCSI_PARAM_PING_TMO
:
2696 sscanf(buf
, "%d", &conn
->ping_timeout
);
2698 case ISCSI_PARAM_RECV_TMO
:
2699 sscanf(buf
, "%d", &conn
->recv_timeout
);
2701 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2702 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
2704 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2705 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
2707 case ISCSI_PARAM_HDRDGST_EN
:
2708 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
2710 case ISCSI_PARAM_DATADGST_EN
:
2711 sscanf(buf
, "%d", &conn
->datadgst_en
);
2713 case ISCSI_PARAM_INITIAL_R2T_EN
:
2714 sscanf(buf
, "%d", &session
->initial_r2t_en
);
2716 case ISCSI_PARAM_MAX_R2T
:
2717 sscanf(buf
, "%d", &session
->max_r2t
);
2719 case ISCSI_PARAM_IMM_DATA_EN
:
2720 sscanf(buf
, "%d", &session
->imm_data_en
);
2722 case ISCSI_PARAM_FIRST_BURST
:
2723 sscanf(buf
, "%d", &session
->first_burst
);
2725 case ISCSI_PARAM_MAX_BURST
:
2726 sscanf(buf
, "%d", &session
->max_burst
);
2728 case ISCSI_PARAM_PDU_INORDER_EN
:
2729 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
2731 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2732 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
2734 case ISCSI_PARAM_ERL
:
2735 sscanf(buf
, "%d", &session
->erl
);
2737 case ISCSI_PARAM_IFMARKER_EN
:
2738 sscanf(buf
, "%d", &value
);
2741 case ISCSI_PARAM_OFMARKER_EN
:
2742 sscanf(buf
, "%d", &value
);
2745 case ISCSI_PARAM_EXP_STATSN
:
2746 sscanf(buf
, "%u", &conn
->exp_statsn
);
2748 case ISCSI_PARAM_USERNAME
:
2749 return iscsi_switch_str_param(&session
->username
, buf
);
2750 case ISCSI_PARAM_USERNAME_IN
:
2751 return iscsi_switch_str_param(&session
->username_in
, buf
);
2752 case ISCSI_PARAM_PASSWORD
:
2753 return iscsi_switch_str_param(&session
->password
, buf
);
2754 case ISCSI_PARAM_PASSWORD_IN
:
2755 return iscsi_switch_str_param(&session
->password_in
, buf
);
2756 case ISCSI_PARAM_TARGET_NAME
:
2757 return iscsi_switch_str_param(&session
->targetname
, buf
);
2758 case ISCSI_PARAM_TPGT
:
2759 sscanf(buf
, "%d", &session
->tpgt
);
2761 case ISCSI_PARAM_PERSISTENT_PORT
:
2762 sscanf(buf
, "%d", &conn
->persistent_port
);
2764 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2765 return iscsi_switch_str_param(&conn
->persistent_address
, buf
);
2766 case ISCSI_PARAM_IFACE_NAME
:
2767 return iscsi_switch_str_param(&session
->ifacename
, buf
);
2768 case ISCSI_PARAM_INITIATOR_NAME
:
2769 return iscsi_switch_str_param(&session
->initiatorname
, buf
);
2776 EXPORT_SYMBOL_GPL(iscsi_set_param
);
2778 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
2779 enum iscsi_param param
, char *buf
)
2781 struct iscsi_session
*session
= cls_session
->dd_data
;
2785 case ISCSI_PARAM_FAST_ABORT
:
2786 len
= sprintf(buf
, "%d\n", session
->fast_abort
);
2788 case ISCSI_PARAM_ABORT_TMO
:
2789 len
= sprintf(buf
, "%d\n", session
->abort_timeout
);
2791 case ISCSI_PARAM_LU_RESET_TMO
:
2792 len
= sprintf(buf
, "%d\n", session
->lu_reset_timeout
);
2794 case ISCSI_PARAM_INITIAL_R2T_EN
:
2795 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
2797 case ISCSI_PARAM_MAX_R2T
:
2798 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
2800 case ISCSI_PARAM_IMM_DATA_EN
:
2801 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
2803 case ISCSI_PARAM_FIRST_BURST
:
2804 len
= sprintf(buf
, "%u\n", session
->first_burst
);
2806 case ISCSI_PARAM_MAX_BURST
:
2807 len
= sprintf(buf
, "%u\n", session
->max_burst
);
2809 case ISCSI_PARAM_PDU_INORDER_EN
:
2810 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
2812 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2813 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
2815 case ISCSI_PARAM_ERL
:
2816 len
= sprintf(buf
, "%d\n", session
->erl
);
2818 case ISCSI_PARAM_TARGET_NAME
:
2819 len
= sprintf(buf
, "%s\n", session
->targetname
);
2821 case ISCSI_PARAM_TPGT
:
2822 len
= sprintf(buf
, "%d\n", session
->tpgt
);
2824 case ISCSI_PARAM_USERNAME
:
2825 len
= sprintf(buf
, "%s\n", session
->username
);
2827 case ISCSI_PARAM_USERNAME_IN
:
2828 len
= sprintf(buf
, "%s\n", session
->username_in
);
2830 case ISCSI_PARAM_PASSWORD
:
2831 len
= sprintf(buf
, "%s\n", session
->password
);
2833 case ISCSI_PARAM_PASSWORD_IN
:
2834 len
= sprintf(buf
, "%s\n", session
->password_in
);
2836 case ISCSI_PARAM_IFACE_NAME
:
2837 len
= sprintf(buf
, "%s\n", session
->ifacename
);
2839 case ISCSI_PARAM_INITIATOR_NAME
:
2840 len
= sprintf(buf
, "%s\n", session
->initiatorname
);
2848 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
2850 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
2851 enum iscsi_param param
, char *buf
)
2853 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2857 case ISCSI_PARAM_PING_TMO
:
2858 len
= sprintf(buf
, "%u\n", conn
->ping_timeout
);
2860 case ISCSI_PARAM_RECV_TMO
:
2861 len
= sprintf(buf
, "%u\n", conn
->recv_timeout
);
2863 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2864 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
2866 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2867 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
2869 case ISCSI_PARAM_HDRDGST_EN
:
2870 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
2872 case ISCSI_PARAM_DATADGST_EN
:
2873 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
2875 case ISCSI_PARAM_IFMARKER_EN
:
2876 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
2878 case ISCSI_PARAM_OFMARKER_EN
:
2879 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
2881 case ISCSI_PARAM_EXP_STATSN
:
2882 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
2884 case ISCSI_PARAM_PERSISTENT_PORT
:
2885 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
2887 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2888 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
2896 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
2898 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2901 struct iscsi_host
*ihost
= shost_priv(shost
);
2905 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2906 len
= sprintf(buf
, "%s\n", ihost
->netdev
);
2908 case ISCSI_HOST_PARAM_HWADDRESS
:
2909 len
= sprintf(buf
, "%s\n", ihost
->hwaddress
);
2911 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2912 len
= sprintf(buf
, "%s\n", ihost
->initiatorname
);
2914 case ISCSI_HOST_PARAM_IPADDRESS
:
2915 len
= sprintf(buf
, "%s\n", ihost
->local_address
);
2923 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
2925 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2926 char *buf
, int buflen
)
2928 struct iscsi_host
*ihost
= shost_priv(shost
);
2931 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2932 return iscsi_switch_str_param(&ihost
->netdev
, buf
);
2933 case ISCSI_HOST_PARAM_HWADDRESS
:
2934 return iscsi_switch_str_param(&ihost
->hwaddress
, buf
);
2935 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2936 return iscsi_switch_str_param(&ihost
->initiatorname
, buf
);
2943 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
2945 MODULE_AUTHOR("Mike Christie");
2946 MODULE_DESCRIPTION("iSCSI library functions");
2947 MODULE_LICENSE("GPL");