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 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
42 #define SNA32_CHECK 2147483648UL
44 static int iscsi_sna_lt(u32 n1
, u32 n2
)
46 return n1
!= n2
&& ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
47 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
50 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
51 static int iscsi_sna_lte(u32 n1
, u32 n2
)
53 return n1
== n2
|| ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
54 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
58 iscsi_update_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
60 uint32_t max_cmdsn
= be32_to_cpu(hdr
->max_cmdsn
);
61 uint32_t exp_cmdsn
= be32_to_cpu(hdr
->exp_cmdsn
);
64 * standard specifies this check for when to update expected and
65 * max sequence numbers
67 if (iscsi_sna_lt(max_cmdsn
, exp_cmdsn
- 1))
70 if (exp_cmdsn
!= session
->exp_cmdsn
&&
71 !iscsi_sna_lt(exp_cmdsn
, session
->exp_cmdsn
))
72 session
->exp_cmdsn
= exp_cmdsn
;
74 if (max_cmdsn
!= session
->max_cmdsn
&&
75 !iscsi_sna_lt(max_cmdsn
, session
->max_cmdsn
)) {
76 session
->max_cmdsn
= max_cmdsn
;
78 * if the window closed with IO queued, then kick the
81 if (!list_empty(&session
->leadconn
->xmitqueue
) ||
82 !list_empty(&session
->leadconn
->mgmtqueue
)) {
83 if (!(session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
84 scsi_queue_work(session
->host
,
85 &session
->leadconn
->xmitwork
);
89 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn
);
91 void iscsi_prep_unsolicit_data_pdu(struct iscsi_task
*task
,
92 struct iscsi_data
*hdr
)
94 struct iscsi_conn
*conn
= task
->conn
;
96 memset(hdr
, 0, sizeof(struct iscsi_data
));
97 hdr
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
98 hdr
->datasn
= cpu_to_be32(task
->unsol_datasn
);
100 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
101 memcpy(hdr
->lun
, task
->hdr
->lun
, sizeof(hdr
->lun
));
103 hdr
->itt
= task
->hdr
->itt
;
104 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
105 hdr
->offset
= cpu_to_be32(task
->unsol_offset
);
107 if (task
->unsol_count
> conn
->max_xmit_dlength
) {
108 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
109 task
->data_count
= conn
->max_xmit_dlength
;
110 task
->unsol_offset
+= task
->data_count
;
113 hton24(hdr
->dlength
, task
->unsol_count
);
114 task
->data_count
= task
->unsol_count
;
115 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
118 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu
);
120 static int iscsi_add_hdr(struct iscsi_task
*task
, unsigned len
)
122 unsigned exp_len
= task
->hdr_len
+ len
;
124 if (exp_len
> task
->hdr_max
) {
129 WARN_ON(len
& (ISCSI_PAD_LEN
- 1)); /* caller must pad the AHS */
130 task
->hdr_len
= exp_len
;
135 * make an extended cdb AHS
137 static int iscsi_prep_ecdb_ahs(struct iscsi_task
*task
)
139 struct scsi_cmnd
*cmd
= task
->sc
;
140 unsigned rlen
, pad_len
;
141 unsigned short ahslength
;
142 struct iscsi_ecdb_ahdr
*ecdb_ahdr
;
145 ecdb_ahdr
= iscsi_next_hdr(task
);
146 rlen
= cmd
->cmd_len
- ISCSI_CDB_SIZE
;
148 BUG_ON(rlen
> sizeof(ecdb_ahdr
->ecdb
));
149 ahslength
= rlen
+ sizeof(ecdb_ahdr
->reserved
);
151 pad_len
= iscsi_padding(rlen
);
153 rc
= iscsi_add_hdr(task
, sizeof(ecdb_ahdr
->ahslength
) +
154 sizeof(ecdb_ahdr
->ahstype
) + ahslength
+ pad_len
);
159 memset(&ecdb_ahdr
->ecdb
[rlen
], 0, pad_len
);
161 ecdb_ahdr
->ahslength
= cpu_to_be16(ahslength
);
162 ecdb_ahdr
->ahstype
= ISCSI_AHSTYPE_CDB
;
163 ecdb_ahdr
->reserved
= 0;
164 memcpy(ecdb_ahdr
->ecdb
, cmd
->cmnd
+ ISCSI_CDB_SIZE
, rlen
);
166 debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
167 "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n",
168 cmd
->cmd_len
, rlen
, pad_len
, ahslength
, task
->hdr_len
);
173 static int iscsi_prep_bidi_ahs(struct iscsi_task
*task
)
175 struct scsi_cmnd
*sc
= task
->sc
;
176 struct iscsi_rlength_ahdr
*rlen_ahdr
;
179 rlen_ahdr
= iscsi_next_hdr(task
);
180 rc
= iscsi_add_hdr(task
, sizeof(*rlen_ahdr
));
184 rlen_ahdr
->ahslength
=
185 cpu_to_be16(sizeof(rlen_ahdr
->read_length
) +
186 sizeof(rlen_ahdr
->reserved
));
187 rlen_ahdr
->ahstype
= ISCSI_AHSTYPE_RLENGTH
;
188 rlen_ahdr
->reserved
= 0;
189 rlen_ahdr
->read_length
= cpu_to_be32(scsi_in(sc
)->length
);
191 debug_scsi("bidi-in rlen_ahdr->read_length(%d) "
192 "rlen_ahdr->ahslength(%d)\n",
193 be32_to_cpu(rlen_ahdr
->read_length
),
194 be16_to_cpu(rlen_ahdr
->ahslength
));
199 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
202 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
203 * fields like dlength or final based on how much data it sends
205 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task
*task
)
207 struct iscsi_conn
*conn
= task
->conn
;
208 struct iscsi_session
*session
= conn
->session
;
209 struct iscsi_cmd
*hdr
= task
->hdr
;
210 struct scsi_cmnd
*sc
= task
->sc
;
211 unsigned hdrlength
, cmd_len
;
215 rc
= iscsi_add_hdr(task
, sizeof(*hdr
));
218 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
219 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
220 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
221 hdr
->itt
= build_itt(task
->itt
, session
->age
);
222 hdr
->cmdsn
= cpu_to_be32(session
->cmdsn
);
224 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
225 cmd_len
= sc
->cmd_len
;
226 if (cmd_len
< ISCSI_CDB_SIZE
)
227 memset(&hdr
->cdb
[cmd_len
], 0, ISCSI_CDB_SIZE
- cmd_len
);
228 else if (cmd_len
> ISCSI_CDB_SIZE
) {
229 rc
= iscsi_prep_ecdb_ahs(task
);
232 cmd_len
= ISCSI_CDB_SIZE
;
234 memcpy(hdr
->cdb
, sc
->cmnd
, cmd_len
);
237 if (scsi_bidi_cmnd(sc
)) {
238 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
239 rc
= iscsi_prep_bidi_ahs(task
);
243 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
244 unsigned out_len
= scsi_out(sc
)->length
;
245 hdr
->data_length
= cpu_to_be32(out_len
);
246 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
250 * imm_count bytes to be sent right after
253 * unsol_count bytes(as Data-Out) to be sent
254 * without R2T ack right after
257 * r2t_data_count bytes to be sent via R2T ack's
259 * pad_count bytes to be sent as zero-padding
261 task
->unsol_count
= 0;
262 task
->unsol_offset
= 0;
263 task
->unsol_datasn
= 0;
265 if (session
->imm_data_en
) {
266 if (out_len
>= session
->first_burst
)
267 task
->imm_count
= min(session
->first_burst
,
268 conn
->max_xmit_dlength
);
270 task
->imm_count
= min(out_len
,
271 conn
->max_xmit_dlength
);
272 hton24(hdr
->dlength
, task
->imm_count
);
274 zero_data(hdr
->dlength
);
276 if (!session
->initial_r2t_en
) {
277 task
->unsol_count
= min(session
->first_burst
, out_len
)
279 task
->unsol_offset
= task
->imm_count
;
282 if (!task
->unsol_count
)
283 /* No unsolicit Data-Out's */
284 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
286 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
287 zero_data(hdr
->dlength
);
288 hdr
->data_length
= cpu_to_be32(scsi_in(sc
)->length
);
290 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
291 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
294 /* calculate size of additional header segments (AHSs) */
295 hdrlength
= task
->hdr_len
- sizeof(*hdr
);
297 WARN_ON(hdrlength
& (ISCSI_PAD_LEN
-1));
298 hdrlength
/= ISCSI_PAD_LEN
;
300 WARN_ON(hdrlength
>= 256);
301 hdr
->hlength
= hdrlength
& 0xFF;
303 if (conn
->session
->tt
->init_task
&&
304 conn
->session
->tt
->init_task(task
))
307 task
->state
= ISCSI_TASK_RUNNING
;
308 list_move_tail(&task
->running
, &conn
->run_list
);
310 conn
->scsicmd_pdus_cnt
++;
311 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
312 "bidi_len %d cmdsn %d win %d]\n", scsi_bidi_cmnd(sc
) ?
313 "bidirectional" : sc
->sc_data_direction
== DMA_TO_DEVICE
?
314 "write" : "read", conn
->id
, sc
, sc
->cmnd
[0], task
->itt
,
316 scsi_bidi_cmnd(sc
) ? scsi_in(sc
)->length
: 0,
317 session
->cmdsn
, session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
322 * iscsi_complete_command - finish a task
323 * @task: iscsi cmd task
325 * Must be called with session lock.
326 * This function returns the scsi command to scsi-ml or cleans
327 * up mgmt tasks then returns the task to the pool.
329 static void iscsi_complete_command(struct iscsi_task
*task
)
331 struct iscsi_conn
*conn
= task
->conn
;
332 struct iscsi_session
*session
= conn
->session
;
333 struct scsi_cmnd
*sc
= task
->sc
;
335 list_del_init(&task
->running
);
336 task
->state
= ISCSI_TASK_COMPLETED
;
339 if (conn
->task
== task
)
342 * login task is preallocated so do not free
344 if (conn
->login_task
== task
)
347 __kfifo_put(session
->cmdpool
.queue
, (void*)&task
, sizeof(void*));
349 if (conn
->ping_task
== task
)
350 conn
->ping_task
= NULL
;
354 /* SCSI eh reuses commands to verify us */
357 * queue command may call this to free the task, but
358 * not have setup the sc callback
365 void __iscsi_get_task(struct iscsi_task
*task
)
367 atomic_inc(&task
->refcount
);
369 EXPORT_SYMBOL_GPL(__iscsi_get_task
);
371 static void __iscsi_put_task(struct iscsi_task
*task
)
373 if (atomic_dec_and_test(&task
->refcount
))
374 iscsi_complete_command(task
);
377 void iscsi_put_task(struct iscsi_task
*task
)
379 struct iscsi_session
*session
= task
->conn
->session
;
381 spin_lock_bh(&session
->lock
);
382 __iscsi_put_task(task
);
383 spin_unlock_bh(&session
->lock
);
385 EXPORT_SYMBOL_GPL(iscsi_put_task
);
388 * session lock must be held
390 static void fail_command(struct iscsi_conn
*conn
, struct iscsi_task
*task
,
393 struct scsi_cmnd
*sc
;
399 if (task
->state
== ISCSI_TASK_PENDING
)
401 * cmd never made it to the xmit thread, so we should not count
402 * the cmd in the sequencing
404 conn
->session
->queued_cmdsn
--;
406 conn
->session
->tt
->cleanup_task(conn
, task
);
409 if (!scsi_bidi_cmnd(sc
))
410 scsi_set_resid(sc
, scsi_bufflen(sc
));
412 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
413 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
416 if (conn
->task
== task
)
418 /* release ref from queuecommand */
419 __iscsi_put_task(task
);
422 static int iscsi_prep_mgmt_task(struct iscsi_conn
*conn
,
423 struct iscsi_task
*task
)
425 struct iscsi_session
*session
= conn
->session
;
426 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)task
->hdr
;
427 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
429 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
432 if (hdr
->opcode
!= (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) &&
433 hdr
->opcode
!= (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
434 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
436 * pre-format CmdSN for outgoing PDU.
438 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
439 if (hdr
->itt
!= RESERVED_ITT
) {
440 hdr
->itt
= build_itt(task
->itt
, session
->age
);
442 * TODO: We always use immediate, so we never hit this.
443 * If we start to send tmfs or nops as non-immediate then
444 * we should start checking the cmdsn numbers for mgmt tasks.
446 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
447 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
448 session
->queued_cmdsn
++;
453 if (session
->tt
->init_task
)
454 session
->tt
->init_task(task
);
456 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
)
457 session
->state
= ISCSI_STATE_LOGGING_OUT
;
459 list_move_tail(&task
->running
, &conn
->mgmt_run_list
);
460 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
461 hdr
->opcode
& ISCSI_OPCODE_MASK
, hdr
->itt
,
466 static struct iscsi_task
*
467 __iscsi_conn_send_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
468 char *data
, uint32_t data_size
)
470 struct iscsi_session
*session
= conn
->session
;
471 struct iscsi_task
*task
;
473 if (session
->state
== ISCSI_STATE_TERMINATE
)
476 if (hdr
->opcode
== (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) ||
477 hdr
->opcode
== (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
479 * Login and Text are sent serially, in
480 * request-followed-by-response sequence.
481 * Same task can be used. Same ITT must be used.
482 * Note that login_task is preallocated at conn_create().
484 task
= conn
->login_task
;
486 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
487 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
489 if (!__kfifo_get(session
->cmdpool
.queue
,
490 (void*)&task
, sizeof(void*)))
493 if ((hdr
->opcode
== (ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
)) &&
494 hdr
->ttt
== RESERVED_ITT
) {
495 conn
->ping_task
= task
;
496 conn
->last_ping
= jiffies
;
500 * released in complete pdu for task we expect a response for, and
501 * released by the lld when it has transmitted the task for
502 * pdus we do not expect a response for.
504 atomic_set(&task
->refcount
, 1);
509 memcpy(task
->data
, data
, data_size
);
510 task
->data_count
= data_size
;
512 task
->data_count
= 0;
514 memcpy(task
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
515 INIT_LIST_HEAD(&task
->running
);
516 list_add_tail(&task
->running
, &conn
->mgmtqueue
);
518 if (session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
) {
519 if (iscsi_prep_mgmt_task(conn
, task
)) {
520 __iscsi_put_task(task
);
524 if (session
->tt
->xmit_task(task
))
528 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
533 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
534 char *data
, uint32_t data_size
)
536 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
537 struct iscsi_session
*session
= conn
->session
;
540 spin_lock_bh(&session
->lock
);
541 if (!__iscsi_conn_send_pdu(conn
, hdr
, data
, data_size
))
543 spin_unlock_bh(&session
->lock
);
546 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
549 * iscsi_cmd_rsp - SCSI Command Response processing
550 * @conn: iscsi connection
552 * @task: scsi command task
553 * @data: cmd data buffer
554 * @datalen: len of buffer
556 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
557 * then completes the command and task.
559 static void iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
560 struct iscsi_task
*task
, char *data
,
563 struct iscsi_cmd_rsp
*rhdr
= (struct iscsi_cmd_rsp
*)hdr
;
564 struct iscsi_session
*session
= conn
->session
;
565 struct scsi_cmnd
*sc
= task
->sc
;
567 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
568 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
570 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
572 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
573 sc
->result
= DID_ERROR
<< 16;
577 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
582 iscsi_conn_printk(KERN_ERR
, conn
,
583 "Got CHECK_CONDITION but invalid data "
584 "buffer size of %d\n", datalen
);
585 sc
->result
= DID_BAD_TARGET
<< 16;
589 senselen
= get_unaligned_be16(data
);
590 if (datalen
< senselen
)
591 goto invalid_datalen
;
593 memcpy(sc
->sense_buffer
, data
+ 2,
594 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
595 debug_scsi("copied %d bytes of sense\n",
596 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
599 if (rhdr
->flags
& (ISCSI_FLAG_CMD_BIDI_UNDERFLOW
|
600 ISCSI_FLAG_CMD_BIDI_OVERFLOW
)) {
601 int res_count
= be32_to_cpu(rhdr
->bi_residual_count
);
603 if (scsi_bidi_cmnd(sc
) && res_count
> 0 &&
604 (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_OVERFLOW
||
605 res_count
<= scsi_in(sc
)->length
))
606 scsi_in(sc
)->resid
= res_count
;
608 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
611 if (rhdr
->flags
& (ISCSI_FLAG_CMD_UNDERFLOW
|
612 ISCSI_FLAG_CMD_OVERFLOW
)) {
613 int res_count
= be32_to_cpu(rhdr
->residual_count
);
616 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
617 res_count
<= scsi_bufflen(sc
)))
618 /* write side for bidi or uni-io set_resid */
619 scsi_set_resid(sc
, res_count
);
621 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
624 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
625 (long)sc
, sc
->result
, task
->itt
);
626 conn
->scsirsp_pdus_cnt
++;
628 __iscsi_put_task(task
);
632 * iscsi_data_in_rsp - SCSI Data-In Response processing
633 * @conn: iscsi connection
635 * @task: scsi command task
638 iscsi_data_in_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
639 struct iscsi_task
*task
)
641 struct iscsi_data_rsp
*rhdr
= (struct iscsi_data_rsp
*)hdr
;
642 struct scsi_cmnd
*sc
= task
->sc
;
644 if (!(rhdr
->flags
& ISCSI_FLAG_DATA_STATUS
))
647 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
648 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
649 if (rhdr
->flags
& (ISCSI_FLAG_DATA_UNDERFLOW
|
650 ISCSI_FLAG_DATA_OVERFLOW
)) {
651 int res_count
= be32_to_cpu(rhdr
->residual_count
);
654 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
655 res_count
<= scsi_in(sc
)->length
))
656 scsi_in(sc
)->resid
= res_count
;
658 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
661 conn
->scsirsp_pdus_cnt
++;
662 __iscsi_put_task(task
);
665 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
667 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
669 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
670 conn
->tmfrsp_pdus_cnt
++;
672 if (conn
->tmf_state
!= TMF_QUEUED
)
675 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
676 conn
->tmf_state
= TMF_SUCCESS
;
677 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
678 conn
->tmf_state
= TMF_NOT_FOUND
;
680 conn
->tmf_state
= TMF_FAILED
;
681 wake_up(&conn
->ehwait
);
684 static void iscsi_send_nopout(struct iscsi_conn
*conn
, struct iscsi_nopin
*rhdr
)
686 struct iscsi_nopout hdr
;
687 struct iscsi_task
*task
;
689 if (!rhdr
&& conn
->ping_task
)
692 memset(&hdr
, 0, sizeof(struct iscsi_nopout
));
693 hdr
.opcode
= ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
;
694 hdr
.flags
= ISCSI_FLAG_CMD_FINAL
;
697 memcpy(hdr
.lun
, rhdr
->lun
, 8);
699 hdr
.itt
= RESERVED_ITT
;
701 hdr
.ttt
= RESERVED_ITT
;
703 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)&hdr
, NULL
, 0);
705 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send nopout\n");
708 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
709 char *data
, int datalen
)
711 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
712 struct iscsi_hdr rejected_pdu
;
715 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
717 if (reject
->reason
== ISCSI_REASON_DATA_DIGEST_ERROR
) {
718 if (ntoh24(reject
->dlength
) > datalen
)
719 return ISCSI_ERR_PROTO
;
721 if (ntoh24(reject
->dlength
) >= sizeof(struct iscsi_hdr
)) {
722 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
723 itt
= get_itt(rejected_pdu
.itt
);
724 iscsi_conn_printk(KERN_ERR
, conn
,
725 "itt 0x%x had pdu (op 0x%x) rejected "
726 "due to DataDigest error.\n", itt
,
727 rejected_pdu
.opcode
);
734 * iscsi_itt_to_task - look up task by itt
735 * @conn: iscsi connection
738 * This should be used for mgmt tasks like login and nops, or if
739 * the LDD's itt space does not include the session age.
741 * The session lock must be held.
743 static struct iscsi_task
*iscsi_itt_to_task(struct iscsi_conn
*conn
, itt_t itt
)
745 struct iscsi_session
*session
= conn
->session
;
748 if (itt
== RESERVED_ITT
)
752 if (i
>= session
->cmds_max
)
755 return session
->cmds
[i
];
759 * __iscsi_complete_pdu - complete pdu
763 * @datalen: len of data buffer
765 * Completes pdu processing by freeing any resources allocated at
766 * queuecommand or send generic. session lock must be held and verify
767 * itt must have been called.
769 int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
770 char *data
, int datalen
)
772 struct iscsi_session
*session
= conn
->session
;
773 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
774 struct iscsi_task
*task
;
777 conn
->last_recv
= jiffies
;
778 rc
= iscsi_verify_itt(conn
, hdr
->itt
);
782 if (hdr
->itt
!= RESERVED_ITT
)
783 itt
= get_itt(hdr
->itt
);
787 debug_scsi("[op 0x%x cid %d itt 0x%x len %d]\n",
788 opcode
, conn
->id
, itt
, datalen
);
791 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
794 case ISCSI_OP_NOOP_IN
:
796 rc
= ISCSI_ERR_PROTO
;
800 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
803 iscsi_send_nopout(conn
, (struct iscsi_nopin
*)hdr
);
805 case ISCSI_OP_REJECT
:
806 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
808 case ISCSI_OP_ASYNC_EVENT
:
809 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
810 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
811 rc
= ISCSI_ERR_CONN_FAILED
;
814 rc
= ISCSI_ERR_BAD_OPCODE
;
821 case ISCSI_OP_SCSI_CMD_RSP
:
822 case ISCSI_OP_SCSI_DATA_IN
:
823 task
= iscsi_itt_to_ctask(conn
, hdr
->itt
);
825 return ISCSI_ERR_BAD_ITT
;
829 * LLD handles R2Ts if they need to.
832 case ISCSI_OP_LOGOUT_RSP
:
833 case ISCSI_OP_LOGIN_RSP
:
834 case ISCSI_OP_TEXT_RSP
:
835 case ISCSI_OP_SCSI_TMFUNC_RSP
:
836 case ISCSI_OP_NOOP_IN
:
837 task
= iscsi_itt_to_task(conn
, hdr
->itt
);
839 return ISCSI_ERR_BAD_ITT
;
842 return ISCSI_ERR_BAD_OPCODE
;
846 case ISCSI_OP_SCSI_CMD_RSP
:
847 iscsi_scsi_cmd_rsp(conn
, hdr
, task
, data
, datalen
);
849 case ISCSI_OP_SCSI_DATA_IN
:
850 iscsi_data_in_rsp(conn
, hdr
, task
);
852 case ISCSI_OP_LOGOUT_RSP
:
853 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
855 rc
= ISCSI_ERR_PROTO
;
858 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
860 case ISCSI_OP_LOGIN_RSP
:
861 case ISCSI_OP_TEXT_RSP
:
862 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
864 * login related PDU's exp_statsn is handled in
868 case ISCSI_OP_SCSI_TMFUNC_RSP
:
869 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
871 rc
= ISCSI_ERR_PROTO
;
875 iscsi_tmf_rsp(conn
, hdr
);
876 __iscsi_put_task(task
);
878 case ISCSI_OP_NOOP_IN
:
879 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
880 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) || datalen
) {
881 rc
= ISCSI_ERR_PROTO
;
884 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
886 if (conn
->ping_task
!= task
)
888 * If this is not in response to one of our
889 * nops then it must be from userspace.
893 mod_timer(&conn
->transport_timer
, jiffies
+ conn
->recv_timeout
);
894 __iscsi_put_task(task
);
897 rc
= ISCSI_ERR_BAD_OPCODE
;
904 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
905 rc
= ISCSI_ERR_CONN_FAILED
;
906 __iscsi_put_task(task
);
909 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu
);
911 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
912 char *data
, int datalen
)
916 spin_lock(&conn
->session
->lock
);
917 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
918 spin_unlock(&conn
->session
->lock
);
921 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
923 int iscsi_verify_itt(struct iscsi_conn
*conn
, itt_t itt
)
925 struct iscsi_session
*session
= conn
->session
;
928 if (itt
== RESERVED_ITT
)
931 if (((__force u32
)itt
& ISCSI_AGE_MASK
) !=
932 (session
->age
<< ISCSI_AGE_SHIFT
)) {
933 iscsi_conn_printk(KERN_ERR
, conn
,
934 "received itt %x expected session age (%x)\n",
935 (__force u32
)itt
, session
->age
);
936 return ISCSI_ERR_BAD_ITT
;
940 if (i
>= session
->cmds_max
) {
941 iscsi_conn_printk(KERN_ERR
, conn
,
942 "received invalid itt index %u (max cmds "
943 "%u.\n", i
, session
->cmds_max
);
944 return ISCSI_ERR_BAD_ITT
;
948 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
951 * iscsi_itt_to_ctask - look up ctask by itt
952 * @conn: iscsi connection
955 * This should be used for cmd tasks.
957 * The session lock must be held.
959 struct iscsi_task
*iscsi_itt_to_ctask(struct iscsi_conn
*conn
, itt_t itt
)
961 struct iscsi_task
*task
;
963 if (iscsi_verify_itt(conn
, itt
))
966 task
= iscsi_itt_to_task(conn
, itt
);
967 if (!task
|| !task
->sc
)
970 if (task
->sc
->SCp
.phase
!= conn
->session
->age
) {
971 iscsi_session_printk(KERN_ERR
, conn
->session
,
972 "task's session age %d, expected %d\n",
973 task
->sc
->SCp
.phase
, conn
->session
->age
);
979 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask
);
981 void iscsi_session_failure(struct iscsi_cls_session
*cls_session
,
984 struct iscsi_session
*session
= cls_session
->dd_data
;
985 struct iscsi_conn
*conn
;
989 spin_lock_irqsave(&session
->lock
, flags
);
990 conn
= session
->leadconn
;
991 if (session
->state
== ISCSI_STATE_TERMINATE
|| !conn
) {
992 spin_unlock_irqrestore(&session
->lock
, flags
);
996 dev
= get_device(&conn
->cls_conn
->dev
);
997 spin_unlock_irqrestore(&session
->lock
, flags
);
1001 * if the host is being removed bypass the connection
1002 * recovery initialization because we are going to kill
1005 if (err
== ISCSI_ERR_INVALID_HOST
)
1006 iscsi_conn_error_event(conn
->cls_conn
, err
);
1008 iscsi_conn_failure(conn
, err
);
1011 EXPORT_SYMBOL_GPL(iscsi_session_failure
);
1013 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
1015 struct iscsi_session
*session
= conn
->session
;
1016 unsigned long flags
;
1018 spin_lock_irqsave(&session
->lock
, flags
);
1019 if (session
->state
== ISCSI_STATE_FAILED
) {
1020 spin_unlock_irqrestore(&session
->lock
, flags
);
1024 if (conn
->stop_stage
== 0)
1025 session
->state
= ISCSI_STATE_FAILED
;
1026 spin_unlock_irqrestore(&session
->lock
, flags
);
1028 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1029 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1030 iscsi_conn_error_event(conn
->cls_conn
, err
);
1032 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
1034 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn
*conn
)
1036 struct iscsi_session
*session
= conn
->session
;
1039 * Check for iSCSI window and take care of CmdSN wrap-around
1041 if (!iscsi_sna_lte(session
->queued_cmdsn
, session
->max_cmdsn
)) {
1042 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
1043 "CmdSN %u/%u\n", session
->exp_cmdsn
,
1044 session
->max_cmdsn
, session
->cmdsn
,
1045 session
->queued_cmdsn
);
1051 static int iscsi_xmit_task(struct iscsi_conn
*conn
)
1053 struct iscsi_task
*task
= conn
->task
;
1056 __iscsi_get_task(task
);
1057 spin_unlock_bh(&conn
->session
->lock
);
1058 rc
= conn
->session
->tt
->xmit_task(task
);
1059 spin_lock_bh(&conn
->session
->lock
);
1060 __iscsi_put_task(task
);
1062 /* done with this task */
1068 * iscsi_requeue_task - requeue task to run from session workqueue
1069 * @task: task to requeue
1071 * LLDs that need to run a task from the session workqueue should call
1072 * this. The session lock must be held. This should only be called
1073 * by software drivers.
1075 void iscsi_requeue_task(struct iscsi_task
*task
)
1077 struct iscsi_conn
*conn
= task
->conn
;
1079 list_move_tail(&task
->running
, &conn
->requeue
);
1080 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
1082 EXPORT_SYMBOL_GPL(iscsi_requeue_task
);
1085 * iscsi_data_xmit - xmit any command into the scheduled connection
1086 * @conn: iscsi connection
1089 * The function can return -EAGAIN in which case the caller must
1090 * re-schedule it again later or recover. '0' return code means
1093 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
1097 spin_lock_bh(&conn
->session
->lock
);
1098 if (unlikely(conn
->suspend_tx
)) {
1099 debug_scsi("conn %d Tx suspended!\n", conn
->id
);
1100 spin_unlock_bh(&conn
->session
->lock
);
1105 rc
= iscsi_xmit_task(conn
);
1111 * process mgmt pdus like nops before commands since we should
1112 * only have one nop-out as a ping from us and targets should not
1113 * overflow us with nop-ins
1116 while (!list_empty(&conn
->mgmtqueue
)) {
1117 conn
->task
= list_entry(conn
->mgmtqueue
.next
,
1118 struct iscsi_task
, running
);
1119 if (iscsi_prep_mgmt_task(conn
, conn
->task
)) {
1120 __iscsi_put_task(conn
->task
);
1124 rc
= iscsi_xmit_task(conn
);
1129 /* process pending command queue */
1130 while (!list_empty(&conn
->xmitqueue
)) {
1131 if (conn
->tmf_state
== TMF_QUEUED
)
1134 conn
->task
= list_entry(conn
->xmitqueue
.next
,
1135 struct iscsi_task
, running
);
1136 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
1137 fail_command(conn
, conn
->task
, DID_IMM_RETRY
<< 16);
1140 if (iscsi_prep_scsi_cmd_pdu(conn
->task
)) {
1141 fail_command(conn
, conn
->task
, DID_ABORT
<< 16);
1144 rc
= iscsi_xmit_task(conn
);
1148 * we could continuously get new task requests so
1149 * we need to check the mgmt queue for nops that need to
1150 * be sent to aviod starvation
1152 if (!list_empty(&conn
->mgmtqueue
))
1156 while (!list_empty(&conn
->requeue
)) {
1157 if (conn
->session
->fast_abort
&& conn
->tmf_state
!= TMF_INITIAL
)
1161 * we always do fastlogout - conn stop code will clean up.
1163 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
1166 conn
->task
= list_entry(conn
->requeue
.next
,
1167 struct iscsi_task
, running
);
1168 conn
->task
->state
= ISCSI_TASK_RUNNING
;
1169 list_move_tail(conn
->requeue
.next
, &conn
->run_list
);
1170 rc
= iscsi_xmit_task(conn
);
1173 if (!list_empty(&conn
->mgmtqueue
))
1176 spin_unlock_bh(&conn
->session
->lock
);
1180 if (unlikely(conn
->suspend_tx
))
1182 spin_unlock_bh(&conn
->session
->lock
);
1186 static void iscsi_xmitworker(struct work_struct
*work
)
1188 struct iscsi_conn
*conn
=
1189 container_of(work
, struct iscsi_conn
, xmitwork
);
1192 * serialize Xmit worker on a per-connection basis.
1195 rc
= iscsi_data_xmit(conn
);
1196 } while (rc
>= 0 || rc
== -EAGAIN
);
1200 FAILURE_BAD_HOST
= 1,
1201 FAILURE_SESSION_FAILED
,
1202 FAILURE_SESSION_FREED
,
1203 FAILURE_WINDOW_CLOSED
,
1205 FAILURE_SESSION_TERMINATE
,
1206 FAILURE_SESSION_IN_RECOVERY
,
1207 FAILURE_SESSION_RECOVERY_TIMEOUT
,
1208 FAILURE_SESSION_LOGGING_OUT
,
1209 FAILURE_SESSION_NOT_READY
,
1212 int iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
1214 struct iscsi_cls_session
*cls_session
;
1215 struct Scsi_Host
*host
;
1217 struct iscsi_session
*session
;
1218 struct iscsi_conn
*conn
;
1219 struct iscsi_task
*task
= NULL
;
1221 sc
->scsi_done
= done
;
1225 host
= sc
->device
->host
;
1226 spin_unlock(host
->host_lock
);
1228 cls_session
= starget_to_session(scsi_target(sc
->device
));
1229 session
= cls_session
->dd_data
;
1230 spin_lock(&session
->lock
);
1232 reason
= iscsi_session_chkready(cls_session
);
1234 sc
->result
= reason
;
1239 * ISCSI_STATE_FAILED is a temp. state. The recovery
1240 * code will decide what is best to do with command queued
1243 if (session
->state
!= ISCSI_STATE_LOGGED_IN
&&
1244 session
->state
!= ISCSI_STATE_FAILED
) {
1246 * to handle the race between when we set the recovery state
1247 * and block the session we requeue here (commands could
1248 * be entering our queuecommand while a block is starting
1249 * up because the block code is not locked)
1251 switch (session
->state
) {
1252 case ISCSI_STATE_IN_RECOVERY
:
1253 reason
= FAILURE_SESSION_IN_RECOVERY
;
1255 case ISCSI_STATE_LOGGING_OUT
:
1256 reason
= FAILURE_SESSION_LOGGING_OUT
;
1258 case ISCSI_STATE_RECOVERY_FAILED
:
1259 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
1260 sc
->result
= DID_TRANSPORT_FAILFAST
<< 16;
1262 case ISCSI_STATE_TERMINATE
:
1263 reason
= FAILURE_SESSION_TERMINATE
;
1264 sc
->result
= DID_NO_CONNECT
<< 16;
1267 reason
= FAILURE_SESSION_FREED
;
1268 sc
->result
= DID_NO_CONNECT
<< 16;
1273 conn
= session
->leadconn
;
1275 reason
= FAILURE_SESSION_FREED
;
1276 sc
->result
= DID_NO_CONNECT
<< 16;
1280 if (iscsi_check_cmdsn_window_closed(conn
)) {
1281 reason
= FAILURE_WINDOW_CLOSED
;
1285 if (!__kfifo_get(session
->cmdpool
.queue
, (void*)&task
,
1287 reason
= FAILURE_OOM
;
1290 sc
->SCp
.phase
= session
->age
;
1291 sc
->SCp
.ptr
= (char *)task
;
1293 atomic_set(&task
->refcount
, 1);
1294 task
->state
= ISCSI_TASK_PENDING
;
1297 INIT_LIST_HEAD(&task
->running
);
1298 list_add_tail(&task
->running
, &conn
->xmitqueue
);
1300 if (session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
) {
1301 if (iscsi_prep_scsi_cmd_pdu(task
)) {
1302 sc
->result
= DID_ABORT
<< 16;
1303 sc
->scsi_done
= NULL
;
1304 iscsi_complete_command(task
);
1307 if (session
->tt
->xmit_task(task
)) {
1308 sc
->scsi_done
= NULL
;
1309 iscsi_complete_command(task
);
1310 reason
= FAILURE_SESSION_NOT_READY
;
1314 scsi_queue_work(session
->host
, &conn
->xmitwork
);
1316 session
->queued_cmdsn
++;
1317 spin_unlock(&session
->lock
);
1318 spin_lock(host
->host_lock
);
1322 spin_unlock(&session
->lock
);
1323 debug_scsi("cmd 0x%x rejected (%d)\n", sc
->cmnd
[0], reason
);
1324 spin_lock(host
->host_lock
);
1325 return SCSI_MLQUEUE_TARGET_BUSY
;
1328 spin_unlock(&session
->lock
);
1329 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc
->cmnd
[0], reason
);
1330 if (!scsi_bidi_cmnd(sc
))
1331 scsi_set_resid(sc
, scsi_bufflen(sc
));
1333 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
1334 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
1337 spin_lock(host
->host_lock
);
1340 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
1342 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
)
1344 if (depth
> ISCSI_MAX_CMD_PER_LUN
)
1345 depth
= ISCSI_MAX_CMD_PER_LUN
;
1346 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
1347 return sdev
->queue_depth
;
1349 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
1351 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
1353 struct iscsi_session
*session
= cls_session
->dd_data
;
1355 spin_lock_bh(&session
->lock
);
1356 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1357 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
1358 if (session
->leadconn
)
1359 wake_up(&session
->leadconn
->ehwait
);
1361 spin_unlock_bh(&session
->lock
);
1363 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
1365 int iscsi_eh_target_reset(struct scsi_cmnd
*sc
)
1367 struct iscsi_cls_session
*cls_session
;
1368 struct iscsi_session
*session
;
1369 struct iscsi_conn
*conn
;
1371 cls_session
= starget_to_session(scsi_target(sc
->device
));
1372 session
= cls_session
->dd_data
;
1373 conn
= session
->leadconn
;
1375 mutex_lock(&session
->eh_mutex
);
1376 spin_lock_bh(&session
->lock
);
1377 if (session
->state
== ISCSI_STATE_TERMINATE
) {
1379 debug_scsi("failing target reset: session terminated "
1380 "[CID %d age %d]\n", conn
->id
, session
->age
);
1381 spin_unlock_bh(&session
->lock
);
1382 mutex_unlock(&session
->eh_mutex
);
1386 spin_unlock_bh(&session
->lock
);
1387 mutex_unlock(&session
->eh_mutex
);
1389 * we drop the lock here but the leadconn cannot be destoyed while
1390 * we are in the scsi eh
1392 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1394 debug_scsi("iscsi_eh_target_reset wait for relogin\n");
1395 wait_event_interruptible(conn
->ehwait
,
1396 session
->state
== ISCSI_STATE_TERMINATE
||
1397 session
->state
== ISCSI_STATE_LOGGED_IN
||
1398 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
1399 if (signal_pending(current
))
1400 flush_signals(current
);
1402 mutex_lock(&session
->eh_mutex
);
1403 spin_lock_bh(&session
->lock
);
1404 if (session
->state
== ISCSI_STATE_LOGGED_IN
)
1405 iscsi_session_printk(KERN_INFO
, session
,
1406 "target reset succeeded\n");
1409 spin_unlock_bh(&session
->lock
);
1410 mutex_unlock(&session
->eh_mutex
);
1413 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset
);
1415 static void iscsi_tmf_timedout(unsigned long data
)
1417 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1418 struct iscsi_session
*session
= conn
->session
;
1420 spin_lock(&session
->lock
);
1421 if (conn
->tmf_state
== TMF_QUEUED
) {
1422 conn
->tmf_state
= TMF_TIMEDOUT
;
1423 debug_scsi("tmf timedout\n");
1424 /* unblock eh_abort() */
1425 wake_up(&conn
->ehwait
);
1427 spin_unlock(&session
->lock
);
1430 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn
*conn
,
1431 struct iscsi_tm
*hdr
, int age
,
1434 struct iscsi_session
*session
= conn
->session
;
1435 struct iscsi_task
*task
;
1437 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)hdr
,
1440 spin_unlock_bh(&session
->lock
);
1441 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1442 spin_lock_bh(&session
->lock
);
1443 debug_scsi("tmf exec failure\n");
1446 conn
->tmfcmd_pdus_cnt
++;
1447 conn
->tmf_timer
.expires
= timeout
* HZ
+ jiffies
;
1448 conn
->tmf_timer
.function
= iscsi_tmf_timedout
;
1449 conn
->tmf_timer
.data
= (unsigned long)conn
;
1450 add_timer(&conn
->tmf_timer
);
1451 debug_scsi("tmf set timeout\n");
1453 spin_unlock_bh(&session
->lock
);
1454 mutex_unlock(&session
->eh_mutex
);
1457 * block eh thread until:
1461 * 3) session is terminated or restarted or userspace has
1462 * given up on recovery
1464 wait_event_interruptible(conn
->ehwait
, age
!= session
->age
||
1465 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1466 conn
->tmf_state
!= TMF_QUEUED
);
1467 if (signal_pending(current
))
1468 flush_signals(current
);
1469 del_timer_sync(&conn
->tmf_timer
);
1471 mutex_lock(&session
->eh_mutex
);
1472 spin_lock_bh(&session
->lock
);
1473 /* if the session drops it will clean up the task */
1474 if (age
!= session
->age
||
1475 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1481 * Fail commands. session lock held and recv side suspended and xmit
1484 static void fail_all_commands(struct iscsi_conn
*conn
, unsigned lun
,
1487 struct iscsi_task
*task
, *tmp
;
1489 if (conn
->task
&& (conn
->task
->sc
->device
->lun
== lun
|| lun
== -1))
1493 list_for_each_entry_safe(task
, tmp
, &conn
->xmitqueue
, running
) {
1494 if (lun
== task
->sc
->device
->lun
|| lun
== -1) {
1495 debug_scsi("failing pending sc %p itt 0x%x\n",
1496 task
->sc
, task
->itt
);
1497 fail_command(conn
, task
, error
<< 16);
1501 list_for_each_entry_safe(task
, tmp
, &conn
->requeue
, running
) {
1502 if (lun
== task
->sc
->device
->lun
|| lun
== -1) {
1503 debug_scsi("failing requeued sc %p itt 0x%x\n",
1504 task
->sc
, task
->itt
);
1505 fail_command(conn
, task
, error
<< 16);
1509 /* fail all other running */
1510 list_for_each_entry_safe(task
, tmp
, &conn
->run_list
, running
) {
1511 if (lun
== task
->sc
->device
->lun
|| lun
== -1) {
1512 debug_scsi("failing in progress sc %p itt 0x%x\n",
1513 task
->sc
, task
->itt
);
1514 fail_command(conn
, task
, error
<< 16);
1519 void iscsi_suspend_tx(struct iscsi_conn
*conn
)
1521 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1522 if (!(conn
->session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
1523 scsi_flush_work(conn
->session
->host
);
1525 EXPORT_SYMBOL_GPL(iscsi_suspend_tx
);
1527 static void iscsi_start_tx(struct iscsi_conn
*conn
)
1529 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1530 if (!(conn
->session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
1531 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
1534 static enum blk_eh_timer_return
iscsi_eh_cmd_timed_out(struct scsi_cmnd
*scmd
)
1536 struct iscsi_cls_session
*cls_session
;
1537 struct iscsi_session
*session
;
1538 struct iscsi_conn
*conn
;
1539 enum blk_eh_timer_return rc
= BLK_EH_NOT_HANDLED
;
1541 cls_session
= starget_to_session(scsi_target(scmd
->device
));
1542 session
= cls_session
->dd_data
;
1544 debug_scsi("scsi cmd %p timedout\n", scmd
);
1546 spin_lock(&session
->lock
);
1547 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1549 * We are probably in the middle of iscsi recovery so let
1550 * that complete and handle the error.
1552 rc
= BLK_EH_RESET_TIMER
;
1556 conn
= session
->leadconn
;
1558 /* In the middle of shuting down */
1559 rc
= BLK_EH_RESET_TIMER
;
1563 if (!conn
->recv_timeout
&& !conn
->ping_timeout
)
1566 * if the ping timedout then we are in the middle of cleaning up
1567 * and can let the iscsi eh handle it
1569 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
) +
1570 (conn
->ping_timeout
* HZ
), jiffies
))
1571 rc
= BLK_EH_RESET_TIMER
;
1573 * if we are about to check the transport then give the command
1576 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
),
1578 rc
= BLK_EH_RESET_TIMER
;
1579 /* if in the middle of checking the transport then give us more time */
1580 if (conn
->ping_task
)
1581 rc
= BLK_EH_RESET_TIMER
;
1583 spin_unlock(&session
->lock
);
1584 debug_scsi("return %s\n", rc
== BLK_EH_RESET_TIMER
?
1585 "timer reset" : "nh");
1589 static void iscsi_check_transport_timeouts(unsigned long data
)
1591 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1592 struct iscsi_session
*session
= conn
->session
;
1593 unsigned long recv_timeout
, next_timeout
= 0, last_recv
;
1595 spin_lock(&session
->lock
);
1596 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
1599 recv_timeout
= conn
->recv_timeout
;
1604 last_recv
= conn
->last_recv
;
1605 if (conn
->ping_task
&&
1606 time_before_eq(conn
->last_ping
+ (conn
->ping_timeout
* HZ
),
1608 iscsi_conn_printk(KERN_ERR
, conn
, "ping timeout of %d secs "
1609 "expired, last rx %lu, last ping %lu, "
1610 "now %lu\n", conn
->ping_timeout
, last_recv
,
1611 conn
->last_ping
, jiffies
);
1612 spin_unlock(&session
->lock
);
1613 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1617 if (time_before_eq(last_recv
+ recv_timeout
, jiffies
)) {
1618 /* send a ping to try to provoke some traffic */
1619 debug_scsi("Sending nopout as ping on conn %p\n", conn
);
1620 iscsi_send_nopout(conn
, NULL
);
1621 next_timeout
= conn
->last_ping
+ (conn
->ping_timeout
* HZ
);
1623 next_timeout
= last_recv
+ recv_timeout
;
1625 debug_scsi("Setting next tmo %lu\n", next_timeout
);
1626 mod_timer(&conn
->transport_timer
, next_timeout
);
1628 spin_unlock(&session
->lock
);
1631 static void iscsi_prep_abort_task_pdu(struct iscsi_task
*task
,
1632 struct iscsi_tm
*hdr
)
1634 memset(hdr
, 0, sizeof(*hdr
));
1635 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1636 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
& ISCSI_FLAG_TM_FUNC_MASK
;
1637 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1638 memcpy(hdr
->lun
, task
->hdr
->lun
, sizeof(hdr
->lun
));
1639 hdr
->rtt
= task
->hdr
->itt
;
1640 hdr
->refcmdsn
= task
->hdr
->cmdsn
;
1643 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
1645 struct iscsi_cls_session
*cls_session
;
1646 struct iscsi_session
*session
;
1647 struct iscsi_conn
*conn
;
1648 struct iscsi_task
*task
;
1649 struct iscsi_tm
*hdr
;
1652 cls_session
= starget_to_session(scsi_target(sc
->device
));
1653 session
= cls_session
->dd_data
;
1655 mutex_lock(&session
->eh_mutex
);
1656 spin_lock_bh(&session
->lock
);
1658 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1662 debug_scsi("sc never reached iscsi layer or it completed.\n");
1663 spin_unlock_bh(&session
->lock
);
1664 mutex_unlock(&session
->eh_mutex
);
1669 * If we are not logged in or we have started a new session
1670 * then let the host reset code handle this
1672 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
||
1673 sc
->SCp
.phase
!= session
->age
) {
1674 spin_unlock_bh(&session
->lock
);
1675 mutex_unlock(&session
->eh_mutex
);
1679 conn
= session
->leadconn
;
1680 conn
->eh_abort_cnt
++;
1683 task
= (struct iscsi_task
*)sc
->SCp
.ptr
;
1684 debug_scsi("aborting [sc %p itt 0x%x]\n", sc
, task
->itt
);
1686 /* task completed before time out */
1688 debug_scsi("sc completed while abort in progress\n");
1692 if (task
->state
== ISCSI_TASK_PENDING
) {
1693 fail_command(conn
, task
, DID_ABORT
<< 16);
1697 /* only have one tmf outstanding at a time */
1698 if (conn
->tmf_state
!= TMF_INITIAL
)
1700 conn
->tmf_state
= TMF_QUEUED
;
1703 iscsi_prep_abort_task_pdu(task
, hdr
);
1705 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, age
, session
->abort_timeout
)) {
1710 switch (conn
->tmf_state
) {
1712 spin_unlock_bh(&session
->lock
);
1714 * stop tx side incase the target had sent a abort rsp but
1715 * the initiator was still writing out data.
1717 iscsi_suspend_tx(conn
);
1719 * we do not stop the recv side because targets have been
1720 * good and have never sent us a successful tmf response
1721 * then sent more data for the cmd.
1723 spin_lock(&session
->lock
);
1724 fail_command(conn
, task
, DID_ABORT
<< 16);
1725 conn
->tmf_state
= TMF_INITIAL
;
1726 spin_unlock(&session
->lock
);
1727 iscsi_start_tx(conn
);
1728 goto success_unlocked
;
1730 spin_unlock_bh(&session
->lock
);
1731 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1732 goto failed_unlocked
;
1735 conn
->tmf_state
= TMF_INITIAL
;
1736 /* task completed before tmf abort response */
1737 debug_scsi("sc completed while abort in progress\n");
1742 conn
->tmf_state
= TMF_INITIAL
;
1747 spin_unlock_bh(&session
->lock
);
1749 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc
, task
->itt
);
1750 mutex_unlock(&session
->eh_mutex
);
1754 spin_unlock_bh(&session
->lock
);
1756 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc
,
1757 task
? task
->itt
: 0);
1758 mutex_unlock(&session
->eh_mutex
);
1761 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
1763 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
1765 memset(hdr
, 0, sizeof(*hdr
));
1766 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1767 hdr
->flags
= ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
1768 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1769 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
1770 hdr
->rtt
= RESERVED_ITT
;
1773 int iscsi_eh_device_reset(struct scsi_cmnd
*sc
)
1775 struct iscsi_cls_session
*cls_session
;
1776 struct iscsi_session
*session
;
1777 struct iscsi_conn
*conn
;
1778 struct iscsi_tm
*hdr
;
1781 cls_session
= starget_to_session(scsi_target(sc
->device
));
1782 session
= cls_session
->dd_data
;
1784 debug_scsi("LU Reset [sc %p lun %u]\n", sc
, sc
->device
->lun
);
1786 mutex_lock(&session
->eh_mutex
);
1787 spin_lock_bh(&session
->lock
);
1789 * Just check if we are not logged in. We cannot check for
1790 * the phase because the reset could come from a ioctl.
1792 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
1794 conn
= session
->leadconn
;
1796 /* only have one tmf outstanding at a time */
1797 if (conn
->tmf_state
!= TMF_INITIAL
)
1799 conn
->tmf_state
= TMF_QUEUED
;
1802 iscsi_prep_lun_reset_pdu(sc
, hdr
);
1804 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
1805 session
->lu_reset_timeout
)) {
1810 switch (conn
->tmf_state
) {
1814 spin_unlock_bh(&session
->lock
);
1815 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1818 conn
->tmf_state
= TMF_INITIAL
;
1823 spin_unlock_bh(&session
->lock
);
1825 iscsi_suspend_tx(conn
);
1827 spin_lock_bh(&session
->lock
);
1828 fail_all_commands(conn
, sc
->device
->lun
, DID_ERROR
);
1829 conn
->tmf_state
= TMF_INITIAL
;
1830 spin_unlock_bh(&session
->lock
);
1832 iscsi_start_tx(conn
);
1836 spin_unlock_bh(&session
->lock
);
1838 debug_scsi("iscsi_eh_device_reset %s\n",
1839 rc
== SUCCESS
? "SUCCESS" : "FAILED");
1840 mutex_unlock(&session
->eh_mutex
);
1843 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset
);
1846 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1847 * should be accessed via kfifo_{get,put} on q->queue.
1848 * Optionally, the caller can obtain the array of object pointers
1849 * by passing in a non-NULL @items pointer
1852 iscsi_pool_init(struct iscsi_pool
*q
, int max
, void ***items
, int item_size
)
1854 int i
, num_arrays
= 1;
1856 memset(q
, 0, sizeof(*q
));
1860 /* If the user passed an items pointer, he wants a copy of
1864 q
->pool
= kzalloc(num_arrays
* max
* sizeof(void*), GFP_KERNEL
);
1865 if (q
->pool
== NULL
)
1868 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
1870 if (q
->queue
== ERR_PTR(-ENOMEM
))
1873 for (i
= 0; i
< max
; i
++) {
1874 q
->pool
[i
] = kzalloc(item_size
, GFP_KERNEL
);
1875 if (q
->pool
[i
] == NULL
) {
1879 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
1883 *items
= q
->pool
+ max
;
1884 memcpy(*items
, q
->pool
, max
* sizeof(void *));
1893 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
1895 void iscsi_pool_free(struct iscsi_pool
*q
)
1899 for (i
= 0; i
< q
->max
; i
++)
1904 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
1907 * iscsi_host_add - add host to system
1909 * @pdev: parent device
1911 * This should be called by partial offload and software iscsi drivers
1912 * to add a host to the system.
1914 int iscsi_host_add(struct Scsi_Host
*shost
, struct device
*pdev
)
1916 if (!shost
->can_queue
)
1917 shost
->can_queue
= ISCSI_DEF_XMIT_CMDS_MAX
;
1919 return scsi_add_host(shost
, pdev
);
1921 EXPORT_SYMBOL_GPL(iscsi_host_add
);
1924 * iscsi_host_alloc - allocate a host and driver data
1925 * @sht: scsi host template
1926 * @dd_data_size: driver host data size
1927 * @qdepth: default device queue depth
1929 * This should be called by partial offload and software iscsi drivers.
1930 * To access the driver specific memory use the iscsi_host_priv() macro.
1932 struct Scsi_Host
*iscsi_host_alloc(struct scsi_host_template
*sht
,
1933 int dd_data_size
, uint16_t qdepth
)
1935 struct Scsi_Host
*shost
;
1936 struct iscsi_host
*ihost
;
1938 shost
= scsi_host_alloc(sht
, sizeof(struct iscsi_host
) + dd_data_size
);
1941 shost
->transportt
->eh_timed_out
= iscsi_eh_cmd_timed_out
;
1943 if (qdepth
> ISCSI_MAX_CMD_PER_LUN
|| qdepth
< 1) {
1945 printk(KERN_ERR
"iscsi: invalid queue depth of %d. "
1946 "Queue depth must be between 1 and %d.\n",
1947 qdepth
, ISCSI_MAX_CMD_PER_LUN
);
1948 qdepth
= ISCSI_DEF_CMD_PER_LUN
;
1950 shost
->cmd_per_lun
= qdepth
;
1952 ihost
= shost_priv(shost
);
1953 spin_lock_init(&ihost
->lock
);
1954 ihost
->state
= ISCSI_HOST_SETUP
;
1955 ihost
->num_sessions
= 0;
1956 init_waitqueue_head(&ihost
->session_removal_wq
);
1959 EXPORT_SYMBOL_GPL(iscsi_host_alloc
);
1961 static void iscsi_notify_host_removed(struct iscsi_cls_session
*cls_session
)
1963 iscsi_session_failure(cls_session
, ISCSI_ERR_INVALID_HOST
);
1967 * iscsi_host_remove - remove host and sessions
1970 * If there are any sessions left, this will initiate the removal and wait
1971 * for the completion.
1973 void iscsi_host_remove(struct Scsi_Host
*shost
)
1975 struct iscsi_host
*ihost
= shost_priv(shost
);
1976 unsigned long flags
;
1978 spin_lock_irqsave(&ihost
->lock
, flags
);
1979 ihost
->state
= ISCSI_HOST_REMOVED
;
1980 spin_unlock_irqrestore(&ihost
->lock
, flags
);
1982 iscsi_host_for_each_session(shost
, iscsi_notify_host_removed
);
1983 wait_event_interruptible(ihost
->session_removal_wq
,
1984 ihost
->num_sessions
== 0);
1985 if (signal_pending(current
))
1986 flush_signals(current
);
1988 scsi_remove_host(shost
);
1990 EXPORT_SYMBOL_GPL(iscsi_host_remove
);
1992 void iscsi_host_free(struct Scsi_Host
*shost
)
1994 struct iscsi_host
*ihost
= shost_priv(shost
);
1996 kfree(ihost
->netdev
);
1997 kfree(ihost
->hwaddress
);
1998 kfree(ihost
->initiatorname
);
1999 scsi_host_put(shost
);
2001 EXPORT_SYMBOL_GPL(iscsi_host_free
);
2003 static void iscsi_host_dec_session_cnt(struct Scsi_Host
*shost
)
2005 struct iscsi_host
*ihost
= shost_priv(shost
);
2006 unsigned long flags
;
2008 shost
= scsi_host_get(shost
);
2010 printk(KERN_ERR
"Invalid state. Cannot notify host removal "
2011 "of session teardown event because host already "
2016 spin_lock_irqsave(&ihost
->lock
, flags
);
2017 ihost
->num_sessions
--;
2018 if (ihost
->num_sessions
== 0)
2019 wake_up(&ihost
->session_removal_wq
);
2020 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2021 scsi_host_put(shost
);
2025 * iscsi_session_setup - create iscsi cls session and host and session
2026 * @iscsit: iscsi transport template
2028 * @cmds_max: session can queue
2029 * @cmd_task_size: LLD task private data size
2030 * @initial_cmdsn: initial CmdSN
2032 * This can be used by software iscsi_transports that allocate
2033 * a session per scsi host.
2035 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2036 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2037 * for nop handling and login/logout requests.
2039 struct iscsi_cls_session
*
2040 iscsi_session_setup(struct iscsi_transport
*iscsit
, struct Scsi_Host
*shost
,
2041 uint16_t cmds_max
, int cmd_task_size
,
2042 uint32_t initial_cmdsn
, unsigned int id
)
2044 struct iscsi_host
*ihost
= shost_priv(shost
);
2045 struct iscsi_session
*session
;
2046 struct iscsi_cls_session
*cls_session
;
2047 int cmd_i
, scsi_cmds
, total_cmds
= cmds_max
;
2048 unsigned long flags
;
2050 spin_lock_irqsave(&ihost
->lock
, flags
);
2051 if (ihost
->state
== ISCSI_HOST_REMOVED
) {
2052 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2055 ihost
->num_sessions
++;
2056 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2059 total_cmds
= ISCSI_DEF_XMIT_CMDS_MAX
;
2061 * The iscsi layer needs some tasks for nop handling and tmfs,
2062 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2063 * + 1 command for scsi IO.
2065 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
) {
2066 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2067 "must be a power of two that is at least %d.\n",
2068 total_cmds
, ISCSI_TOTAL_CMDS_MIN
);
2069 goto dec_session_count
;
2072 if (total_cmds
> ISCSI_TOTAL_CMDS_MAX
) {
2073 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2074 "must be a power of 2 less than or equal to %d.\n",
2075 cmds_max
, ISCSI_TOTAL_CMDS_MAX
);
2076 total_cmds
= ISCSI_TOTAL_CMDS_MAX
;
2079 if (!is_power_of_2(total_cmds
)) {
2080 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2081 "must be a power of 2.\n", total_cmds
);
2082 total_cmds
= rounddown_pow_of_two(total_cmds
);
2083 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
)
2085 printk(KERN_INFO
"iscsi: Rounding can_queue to %d.\n",
2088 scsi_cmds
= total_cmds
- ISCSI_MGMT_CMDS_MAX
;
2090 cls_session
= iscsi_alloc_session(shost
, iscsit
,
2091 sizeof(struct iscsi_session
));
2093 goto dec_session_count
;
2094 session
= cls_session
->dd_data
;
2095 session
->cls_session
= cls_session
;
2096 session
->host
= shost
;
2097 session
->state
= ISCSI_STATE_FREE
;
2098 session
->fast_abort
= 1;
2099 session
->lu_reset_timeout
= 15;
2100 session
->abort_timeout
= 10;
2101 session
->scsi_cmds_max
= scsi_cmds
;
2102 session
->cmds_max
= total_cmds
;
2103 session
->queued_cmdsn
= session
->cmdsn
= initial_cmdsn
;
2104 session
->exp_cmdsn
= initial_cmdsn
+ 1;
2105 session
->max_cmdsn
= initial_cmdsn
+ 1;
2106 session
->max_r2t
= 1;
2107 session
->tt
= iscsit
;
2108 mutex_init(&session
->eh_mutex
);
2109 spin_lock_init(&session
->lock
);
2111 /* initialize SCSI PDU commands pool */
2112 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
2113 (void***)&session
->cmds
,
2114 cmd_task_size
+ sizeof(struct iscsi_task
)))
2115 goto cmdpool_alloc_fail
;
2117 /* pre-format cmds pool with ITT */
2118 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
2119 struct iscsi_task
*task
= session
->cmds
[cmd_i
];
2122 task
->dd_data
= &task
[1];
2124 INIT_LIST_HEAD(&task
->running
);
2127 if (!try_module_get(iscsit
->owner
))
2128 goto module_get_fail
;
2130 if (iscsi_add_session(cls_session
, id
))
2131 goto cls_session_fail
;
2136 module_put(iscsit
->owner
);
2138 iscsi_pool_free(&session
->cmdpool
);
2140 iscsi_free_session(cls_session
);
2142 iscsi_host_dec_session_cnt(shost
);
2145 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
2148 * iscsi_session_teardown - destroy session, host, and cls_session
2149 * @cls_session: iscsi session
2151 * The driver must have called iscsi_remove_session before
2154 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
2156 struct iscsi_session
*session
= cls_session
->dd_data
;
2157 struct module
*owner
= cls_session
->transport
->owner
;
2158 struct Scsi_Host
*shost
= session
->host
;
2160 iscsi_pool_free(&session
->cmdpool
);
2162 kfree(session
->password
);
2163 kfree(session
->password_in
);
2164 kfree(session
->username
);
2165 kfree(session
->username_in
);
2166 kfree(session
->targetname
);
2167 kfree(session
->initiatorname
);
2168 kfree(session
->ifacename
);
2170 iscsi_destroy_session(cls_session
);
2171 iscsi_host_dec_session_cnt(shost
);
2174 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
2177 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2178 * @cls_session: iscsi_cls_session
2179 * @dd_size: private driver data size
2182 struct iscsi_cls_conn
*
2183 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, int dd_size
,
2186 struct iscsi_session
*session
= cls_session
->dd_data
;
2187 struct iscsi_conn
*conn
;
2188 struct iscsi_cls_conn
*cls_conn
;
2191 cls_conn
= iscsi_create_conn(cls_session
, sizeof(*conn
) + dd_size
,
2195 conn
= cls_conn
->dd_data
;
2196 memset(conn
, 0, sizeof(*conn
) + dd_size
);
2198 conn
->dd_data
= cls_conn
->dd_data
+ sizeof(*conn
);
2199 conn
->session
= session
;
2200 conn
->cls_conn
= cls_conn
;
2201 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
2202 conn
->id
= conn_idx
;
2203 conn
->exp_statsn
= 0;
2204 conn
->tmf_state
= TMF_INITIAL
;
2206 init_timer(&conn
->transport_timer
);
2207 conn
->transport_timer
.data
= (unsigned long)conn
;
2208 conn
->transport_timer
.function
= iscsi_check_transport_timeouts
;
2210 INIT_LIST_HEAD(&conn
->run_list
);
2211 INIT_LIST_HEAD(&conn
->mgmt_run_list
);
2212 INIT_LIST_HEAD(&conn
->mgmtqueue
);
2213 INIT_LIST_HEAD(&conn
->xmitqueue
);
2214 INIT_LIST_HEAD(&conn
->requeue
);
2215 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
2217 /* allocate login_task used for the login/text sequences */
2218 spin_lock_bh(&session
->lock
);
2219 if (!__kfifo_get(session
->cmdpool
.queue
,
2220 (void*)&conn
->login_task
,
2222 spin_unlock_bh(&session
->lock
);
2223 goto login_task_alloc_fail
;
2225 spin_unlock_bh(&session
->lock
);
2227 data
= kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN
, GFP_KERNEL
);
2229 goto login_task_data_alloc_fail
;
2230 conn
->login_task
->data
= conn
->data
= data
;
2232 init_timer(&conn
->tmf_timer
);
2233 init_waitqueue_head(&conn
->ehwait
);
2237 login_task_data_alloc_fail
:
2238 __kfifo_put(session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2240 login_task_alloc_fail
:
2241 iscsi_destroy_conn(cls_conn
);
2244 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
2247 * iscsi_conn_teardown - teardown iscsi connection
2248 * cls_conn: iscsi class connection
2250 * TODO: we may need to make this into a two step process
2251 * like scsi-mls remove + put host
2253 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
2255 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2256 struct iscsi_session
*session
= conn
->session
;
2257 unsigned long flags
;
2259 del_timer_sync(&conn
->transport_timer
);
2261 spin_lock_bh(&session
->lock
);
2262 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
2263 if (session
->leadconn
== conn
) {
2265 * leading connection? then give up on recovery.
2267 session
->state
= ISCSI_STATE_TERMINATE
;
2268 wake_up(&conn
->ehwait
);
2270 spin_unlock_bh(&session
->lock
);
2273 * Block until all in-progress commands for this connection
2277 spin_lock_irqsave(session
->host
->host_lock
, flags
);
2278 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
2279 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2282 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2283 msleep_interruptible(500);
2284 iscsi_conn_printk(KERN_INFO
, conn
, "iscsi conn_destroy(): "
2285 "host_busy %d host_failed %d\n",
2286 session
->host
->host_busy
,
2287 session
->host
->host_failed
);
2289 * force eh_abort() to unblock
2291 wake_up(&conn
->ehwait
);
2294 /* flush queued up work because we free the connection below */
2295 iscsi_suspend_tx(conn
);
2297 spin_lock_bh(&session
->lock
);
2299 kfree(conn
->persistent_address
);
2300 __kfifo_put(session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2302 if (session
->leadconn
== conn
)
2303 session
->leadconn
= NULL
;
2304 spin_unlock_bh(&session
->lock
);
2306 iscsi_destroy_conn(cls_conn
);
2308 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
2310 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
2312 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2313 struct iscsi_session
*session
= conn
->session
;
2316 iscsi_conn_printk(KERN_ERR
, conn
,
2317 "can't start unbound connection\n");
2321 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
2322 session
->first_burst
> session
->max_burst
) {
2323 iscsi_conn_printk(KERN_INFO
, conn
, "invalid burst lengths: "
2324 "first_burst %d max_burst %d\n",
2325 session
->first_burst
, session
->max_burst
);
2329 if (conn
->ping_timeout
&& !conn
->recv_timeout
) {
2330 iscsi_conn_printk(KERN_ERR
, conn
, "invalid recv timeout of "
2331 "zero. Using 5 seconds\n.");
2332 conn
->recv_timeout
= 5;
2335 if (conn
->recv_timeout
&& !conn
->ping_timeout
) {
2336 iscsi_conn_printk(KERN_ERR
, conn
, "invalid ping timeout of "
2337 "zero. Using 5 seconds.\n");
2338 conn
->ping_timeout
= 5;
2341 spin_lock_bh(&session
->lock
);
2342 conn
->c_stage
= ISCSI_CONN_STARTED
;
2343 session
->state
= ISCSI_STATE_LOGGED_IN
;
2344 session
->queued_cmdsn
= session
->cmdsn
;
2346 conn
->last_recv
= jiffies
;
2347 conn
->last_ping
= jiffies
;
2348 if (conn
->recv_timeout
&& conn
->ping_timeout
)
2349 mod_timer(&conn
->transport_timer
,
2350 jiffies
+ (conn
->recv_timeout
* HZ
));
2352 switch(conn
->stop_stage
) {
2353 case STOP_CONN_RECOVER
:
2355 * unblock eh_abort() if it is blocked. re-try all
2356 * commands after successful recovery
2358 conn
->stop_stage
= 0;
2359 conn
->tmf_state
= TMF_INITIAL
;
2361 if (session
->age
== 16)
2364 case STOP_CONN_TERM
:
2365 conn
->stop_stage
= 0;
2370 spin_unlock_bh(&session
->lock
);
2372 iscsi_unblock_session(session
->cls_session
);
2373 wake_up(&conn
->ehwait
);
2376 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
2379 flush_control_queues(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
2381 struct iscsi_task
*task
, *tmp
;
2383 /* handle pending */
2384 list_for_each_entry_safe(task
, tmp
, &conn
->mgmtqueue
, running
) {
2385 debug_scsi("flushing pending mgmt task itt 0x%x\n", task
->itt
);
2386 /* release ref from prep task */
2387 __iscsi_put_task(task
);
2390 /* handle running */
2391 list_for_each_entry_safe(task
, tmp
, &conn
->mgmt_run_list
, running
) {
2392 debug_scsi("flushing running mgmt task itt 0x%x\n", task
->itt
);
2393 /* release ref from prep task */
2394 __iscsi_put_task(task
);
2400 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
2401 struct iscsi_conn
*conn
, int flag
)
2405 del_timer_sync(&conn
->transport_timer
);
2407 mutex_lock(&session
->eh_mutex
);
2408 spin_lock_bh(&session
->lock
);
2409 if (conn
->stop_stage
== STOP_CONN_TERM
) {
2410 spin_unlock_bh(&session
->lock
);
2411 mutex_unlock(&session
->eh_mutex
);
2416 * When this is called for the in_login state, we only want to clean
2417 * up the login task and connection. We do not need to block and set
2418 * the recovery state again
2420 if (flag
== STOP_CONN_TERM
)
2421 session
->state
= ISCSI_STATE_TERMINATE
;
2422 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
2423 session
->state
= ISCSI_STATE_IN_RECOVERY
;
2425 old_stop_stage
= conn
->stop_stage
;
2426 conn
->stop_stage
= flag
;
2427 conn
->c_stage
= ISCSI_CONN_STOPPED
;
2428 spin_unlock_bh(&session
->lock
);
2430 iscsi_suspend_tx(conn
);
2432 * for connection level recovery we should not calculate
2433 * header digest. conn->hdr_size used for optimization
2434 * in hdr_extract() and will be re-negotiated at
2437 if (flag
== STOP_CONN_RECOVER
) {
2438 conn
->hdrdgst_en
= 0;
2439 conn
->datadgst_en
= 0;
2440 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
2441 old_stop_stage
!= STOP_CONN_RECOVER
) {
2442 debug_scsi("blocking session\n");
2443 iscsi_block_session(session
->cls_session
);
2450 spin_lock_bh(&session
->lock
);
2451 if (flag
== STOP_CONN_RECOVER
)
2452 fail_all_commands(conn
, -1, DID_TRANSPORT_DISRUPTED
);
2454 fail_all_commands(conn
, -1, DID_ERROR
);
2455 flush_control_queues(session
, conn
);
2456 spin_unlock_bh(&session
->lock
);
2457 mutex_unlock(&session
->eh_mutex
);
2460 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
2462 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2463 struct iscsi_session
*session
= conn
->session
;
2466 case STOP_CONN_RECOVER
:
2467 case STOP_CONN_TERM
:
2468 iscsi_start_session_recovery(session
, conn
, flag
);
2471 iscsi_conn_printk(KERN_ERR
, conn
,
2472 "invalid stop flag %d\n", flag
);
2475 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
2477 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
2478 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
2480 struct iscsi_session
*session
= cls_session
->dd_data
;
2481 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2483 spin_lock_bh(&session
->lock
);
2485 session
->leadconn
= conn
;
2486 spin_unlock_bh(&session
->lock
);
2489 * Unblock xmitworker(), Login Phase will pass through.
2491 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
2492 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
2495 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
2498 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
2499 enum iscsi_param param
, char *buf
, int buflen
)
2501 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2502 struct iscsi_session
*session
= conn
->session
;
2506 case ISCSI_PARAM_FAST_ABORT
:
2507 sscanf(buf
, "%d", &session
->fast_abort
);
2509 case ISCSI_PARAM_ABORT_TMO
:
2510 sscanf(buf
, "%d", &session
->abort_timeout
);
2512 case ISCSI_PARAM_LU_RESET_TMO
:
2513 sscanf(buf
, "%d", &session
->lu_reset_timeout
);
2515 case ISCSI_PARAM_PING_TMO
:
2516 sscanf(buf
, "%d", &conn
->ping_timeout
);
2518 case ISCSI_PARAM_RECV_TMO
:
2519 sscanf(buf
, "%d", &conn
->recv_timeout
);
2521 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2522 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
2524 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2525 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
2527 case ISCSI_PARAM_HDRDGST_EN
:
2528 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
2530 case ISCSI_PARAM_DATADGST_EN
:
2531 sscanf(buf
, "%d", &conn
->datadgst_en
);
2533 case ISCSI_PARAM_INITIAL_R2T_EN
:
2534 sscanf(buf
, "%d", &session
->initial_r2t_en
);
2536 case ISCSI_PARAM_MAX_R2T
:
2537 sscanf(buf
, "%d", &session
->max_r2t
);
2539 case ISCSI_PARAM_IMM_DATA_EN
:
2540 sscanf(buf
, "%d", &session
->imm_data_en
);
2542 case ISCSI_PARAM_FIRST_BURST
:
2543 sscanf(buf
, "%d", &session
->first_burst
);
2545 case ISCSI_PARAM_MAX_BURST
:
2546 sscanf(buf
, "%d", &session
->max_burst
);
2548 case ISCSI_PARAM_PDU_INORDER_EN
:
2549 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
2551 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2552 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
2554 case ISCSI_PARAM_ERL
:
2555 sscanf(buf
, "%d", &session
->erl
);
2557 case ISCSI_PARAM_IFMARKER_EN
:
2558 sscanf(buf
, "%d", &value
);
2561 case ISCSI_PARAM_OFMARKER_EN
:
2562 sscanf(buf
, "%d", &value
);
2565 case ISCSI_PARAM_EXP_STATSN
:
2566 sscanf(buf
, "%u", &conn
->exp_statsn
);
2568 case ISCSI_PARAM_USERNAME
:
2569 kfree(session
->username
);
2570 session
->username
= kstrdup(buf
, GFP_KERNEL
);
2571 if (!session
->username
)
2574 case ISCSI_PARAM_USERNAME_IN
:
2575 kfree(session
->username_in
);
2576 session
->username_in
= kstrdup(buf
, GFP_KERNEL
);
2577 if (!session
->username_in
)
2580 case ISCSI_PARAM_PASSWORD
:
2581 kfree(session
->password
);
2582 session
->password
= kstrdup(buf
, GFP_KERNEL
);
2583 if (!session
->password
)
2586 case ISCSI_PARAM_PASSWORD_IN
:
2587 kfree(session
->password_in
);
2588 session
->password_in
= kstrdup(buf
, GFP_KERNEL
);
2589 if (!session
->password_in
)
2592 case ISCSI_PARAM_TARGET_NAME
:
2593 /* this should not change between logins */
2594 if (session
->targetname
)
2597 session
->targetname
= kstrdup(buf
, GFP_KERNEL
);
2598 if (!session
->targetname
)
2601 case ISCSI_PARAM_TPGT
:
2602 sscanf(buf
, "%d", &session
->tpgt
);
2604 case ISCSI_PARAM_PERSISTENT_PORT
:
2605 sscanf(buf
, "%d", &conn
->persistent_port
);
2607 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2609 * this is the address returned in discovery so it should
2610 * not change between logins.
2612 if (conn
->persistent_address
)
2615 conn
->persistent_address
= kstrdup(buf
, GFP_KERNEL
);
2616 if (!conn
->persistent_address
)
2619 case ISCSI_PARAM_IFACE_NAME
:
2620 if (!session
->ifacename
)
2621 session
->ifacename
= kstrdup(buf
, GFP_KERNEL
);
2623 case ISCSI_PARAM_INITIATOR_NAME
:
2624 if (!session
->initiatorname
)
2625 session
->initiatorname
= kstrdup(buf
, GFP_KERNEL
);
2633 EXPORT_SYMBOL_GPL(iscsi_set_param
);
2635 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
2636 enum iscsi_param param
, char *buf
)
2638 struct iscsi_session
*session
= cls_session
->dd_data
;
2642 case ISCSI_PARAM_FAST_ABORT
:
2643 len
= sprintf(buf
, "%d\n", session
->fast_abort
);
2645 case ISCSI_PARAM_ABORT_TMO
:
2646 len
= sprintf(buf
, "%d\n", session
->abort_timeout
);
2648 case ISCSI_PARAM_LU_RESET_TMO
:
2649 len
= sprintf(buf
, "%d\n", session
->lu_reset_timeout
);
2651 case ISCSI_PARAM_INITIAL_R2T_EN
:
2652 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
2654 case ISCSI_PARAM_MAX_R2T
:
2655 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
2657 case ISCSI_PARAM_IMM_DATA_EN
:
2658 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
2660 case ISCSI_PARAM_FIRST_BURST
:
2661 len
= sprintf(buf
, "%u\n", session
->first_burst
);
2663 case ISCSI_PARAM_MAX_BURST
:
2664 len
= sprintf(buf
, "%u\n", session
->max_burst
);
2666 case ISCSI_PARAM_PDU_INORDER_EN
:
2667 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
2669 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2670 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
2672 case ISCSI_PARAM_ERL
:
2673 len
= sprintf(buf
, "%d\n", session
->erl
);
2675 case ISCSI_PARAM_TARGET_NAME
:
2676 len
= sprintf(buf
, "%s\n", session
->targetname
);
2678 case ISCSI_PARAM_TPGT
:
2679 len
= sprintf(buf
, "%d\n", session
->tpgt
);
2681 case ISCSI_PARAM_USERNAME
:
2682 len
= sprintf(buf
, "%s\n", session
->username
);
2684 case ISCSI_PARAM_USERNAME_IN
:
2685 len
= sprintf(buf
, "%s\n", session
->username_in
);
2687 case ISCSI_PARAM_PASSWORD
:
2688 len
= sprintf(buf
, "%s\n", session
->password
);
2690 case ISCSI_PARAM_PASSWORD_IN
:
2691 len
= sprintf(buf
, "%s\n", session
->password_in
);
2693 case ISCSI_PARAM_IFACE_NAME
:
2694 len
= sprintf(buf
, "%s\n", session
->ifacename
);
2696 case ISCSI_PARAM_INITIATOR_NAME
:
2697 if (!session
->initiatorname
)
2698 len
= sprintf(buf
, "%s\n", "unknown");
2700 len
= sprintf(buf
, "%s\n", session
->initiatorname
);
2708 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
2710 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
2711 enum iscsi_param param
, char *buf
)
2713 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2717 case ISCSI_PARAM_PING_TMO
:
2718 len
= sprintf(buf
, "%u\n", conn
->ping_timeout
);
2720 case ISCSI_PARAM_RECV_TMO
:
2721 len
= sprintf(buf
, "%u\n", conn
->recv_timeout
);
2723 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2724 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
2726 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2727 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
2729 case ISCSI_PARAM_HDRDGST_EN
:
2730 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
2732 case ISCSI_PARAM_DATADGST_EN
:
2733 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
2735 case ISCSI_PARAM_IFMARKER_EN
:
2736 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
2738 case ISCSI_PARAM_OFMARKER_EN
:
2739 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
2741 case ISCSI_PARAM_EXP_STATSN
:
2742 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
2744 case ISCSI_PARAM_PERSISTENT_PORT
:
2745 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
2747 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2748 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
2756 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
2758 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2761 struct iscsi_host
*ihost
= shost_priv(shost
);
2765 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2767 len
= sprintf(buf
, "%s\n", "default");
2769 len
= sprintf(buf
, "%s\n", ihost
->netdev
);
2771 case ISCSI_HOST_PARAM_HWADDRESS
:
2772 if (!ihost
->hwaddress
)
2773 len
= sprintf(buf
, "%s\n", "default");
2775 len
= sprintf(buf
, "%s\n", ihost
->hwaddress
);
2777 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2778 if (!ihost
->initiatorname
)
2779 len
= sprintf(buf
, "%s\n", "unknown");
2781 len
= sprintf(buf
, "%s\n", ihost
->initiatorname
);
2783 case ISCSI_HOST_PARAM_IPADDRESS
:
2784 if (!strlen(ihost
->local_address
))
2785 len
= sprintf(buf
, "%s\n", "unknown");
2787 len
= sprintf(buf
, "%s\n",
2788 ihost
->local_address
);
2796 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
2798 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2799 char *buf
, int buflen
)
2801 struct iscsi_host
*ihost
= shost_priv(shost
);
2804 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2806 ihost
->netdev
= kstrdup(buf
, GFP_KERNEL
);
2808 case ISCSI_HOST_PARAM_HWADDRESS
:
2809 if (!ihost
->hwaddress
)
2810 ihost
->hwaddress
= kstrdup(buf
, GFP_KERNEL
);
2812 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2813 if (!ihost
->initiatorname
)
2814 ihost
->initiatorname
= kstrdup(buf
, GFP_KERNEL
);
2822 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
2824 MODULE_AUTHOR("Mike Christie");
2825 MODULE_DESCRIPTION("iSCSI library functions");
2826 MODULE_LICENSE("GPL");