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 <asm/unaligned.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_eh.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi.h>
35 #include <scsi/iscsi_proto.h>
36 #include <scsi/scsi_transport.h>
37 #include <scsi/scsi_transport_iscsi.h>
38 #include <scsi/libiscsi.h>
40 struct iscsi_session
*
41 class_to_transport_session(struct iscsi_cls_session
*cls_session
)
43 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
44 return iscsi_hostdata(shost
->hostdata
);
46 EXPORT_SYMBOL_GPL(class_to_transport_session
);
48 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
49 #define SNA32_CHECK 2147483648UL
51 static int iscsi_sna_lt(u32 n1
, u32 n2
)
53 return n1
!= n2
&& ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
54 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
57 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
58 static int iscsi_sna_lte(u32 n1
, u32 n2
)
60 return n1
== n2
|| ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
61 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
65 iscsi_update_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
67 uint32_t max_cmdsn
= be32_to_cpu(hdr
->max_cmdsn
);
68 uint32_t exp_cmdsn
= be32_to_cpu(hdr
->exp_cmdsn
);
71 * standard specifies this check for when to update expected and
72 * max sequence numbers
74 if (iscsi_sna_lt(max_cmdsn
, exp_cmdsn
- 1))
77 if (exp_cmdsn
!= session
->exp_cmdsn
&&
78 !iscsi_sna_lt(exp_cmdsn
, session
->exp_cmdsn
))
79 session
->exp_cmdsn
= exp_cmdsn
;
81 if (max_cmdsn
!= session
->max_cmdsn
&&
82 !iscsi_sna_lt(max_cmdsn
, session
->max_cmdsn
)) {
83 session
->max_cmdsn
= max_cmdsn
;
85 * if the window closed with IO queued, then kick the
88 if (!list_empty(&session
->leadconn
->xmitqueue
) ||
89 __kfifo_len(session
->leadconn
->mgmtqueue
))
90 scsi_queue_work(session
->host
,
91 &session
->leadconn
->xmitwork
);
94 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn
);
96 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task
*ctask
,
97 struct iscsi_data
*hdr
)
99 struct iscsi_conn
*conn
= ctask
->conn
;
101 memset(hdr
, 0, sizeof(struct iscsi_data
));
102 hdr
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
103 hdr
->datasn
= cpu_to_be32(ctask
->unsol_datasn
);
104 ctask
->unsol_datasn
++;
105 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
106 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
108 hdr
->itt
= ctask
->hdr
->itt
;
109 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
110 hdr
->offset
= cpu_to_be32(ctask
->unsol_offset
);
112 if (ctask
->unsol_count
> conn
->max_xmit_dlength
) {
113 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
114 ctask
->data_count
= conn
->max_xmit_dlength
;
115 ctask
->unsol_offset
+= ctask
->data_count
;
118 hton24(hdr
->dlength
, ctask
->unsol_count
);
119 ctask
->data_count
= ctask
->unsol_count
;
120 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
123 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu
);
126 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
127 * @ctask: iscsi cmd task
129 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
130 * fields like dlength or final based on how much data it sends
132 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task
*ctask
)
134 struct iscsi_conn
*conn
= ctask
->conn
;
135 struct iscsi_session
*session
= conn
->session
;
136 struct iscsi_cmd
*hdr
= ctask
->hdr
;
137 struct scsi_cmnd
*sc
= ctask
->sc
;
139 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
140 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
141 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
142 hdr
->itt
= build_itt(ctask
->itt
, conn
->id
, session
->age
);
143 hdr
->data_length
= cpu_to_be32(sc
->request_bufflen
);
144 hdr
->cmdsn
= cpu_to_be32(session
->cmdsn
);
146 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
147 memcpy(hdr
->cdb
, sc
->cmnd
, sc
->cmd_len
);
148 if (sc
->cmd_len
< MAX_COMMAND_SIZE
)
149 memset(&hdr
->cdb
[sc
->cmd_len
], 0,
150 MAX_COMMAND_SIZE
- sc
->cmd_len
);
152 ctask
->data_count
= 0;
153 ctask
->imm_count
= 0;
154 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
155 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
159 * imm_count bytes to be sent right after
162 * unsol_count bytes(as Data-Out) to be sent
163 * without R2T ack right after
166 * r2t_data_count bytes to be sent via R2T ack's
168 * pad_count bytes to be sent as zero-padding
170 ctask
->unsol_count
= 0;
171 ctask
->unsol_offset
= 0;
172 ctask
->unsol_datasn
= 0;
174 if (session
->imm_data_en
) {
175 if (sc
->request_bufflen
>= session
->first_burst
)
176 ctask
->imm_count
= min(session
->first_burst
,
177 conn
->max_xmit_dlength
);
179 ctask
->imm_count
= min(sc
->request_bufflen
,
180 conn
->max_xmit_dlength
);
181 hton24(ctask
->hdr
->dlength
, ctask
->imm_count
);
183 zero_data(ctask
->hdr
->dlength
);
185 if (!session
->initial_r2t_en
) {
186 ctask
->unsol_count
= min((session
->first_burst
),
187 (sc
->request_bufflen
)) - ctask
->imm_count
;
188 ctask
->unsol_offset
= ctask
->imm_count
;
191 if (!ctask
->unsol_count
)
192 /* No unsolicit Data-Out's */
193 ctask
->hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
195 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
196 zero_data(hdr
->dlength
);
198 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
199 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
202 conn
->scsicmd_pdus_cnt
++;
204 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
205 "cmdsn %d win %d]\n",
206 sc
->sc_data_direction
== DMA_TO_DEVICE
? "write" : "read",
207 conn
->id
, sc
, sc
->cmnd
[0], ctask
->itt
, sc
->request_bufflen
,
208 session
->cmdsn
, session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
212 * iscsi_complete_command - return command back to scsi-ml
213 * @ctask: iscsi cmd task
215 * Must be called with session lock.
216 * This function returns the scsi command to scsi-ml and returns
217 * the cmd task to the pool of available cmd tasks.
219 static void iscsi_complete_command(struct iscsi_cmd_task
*ctask
)
221 struct iscsi_session
*session
= ctask
->conn
->session
;
222 struct scsi_cmnd
*sc
= ctask
->sc
;
224 ctask
->state
= ISCSI_TASK_COMPLETED
;
226 /* SCSI eh reuses commands to verify us */
228 list_del_init(&ctask
->running
);
229 __kfifo_put(session
->cmdpool
.queue
, (void*)&ctask
, sizeof(void*));
233 static void __iscsi_get_ctask(struct iscsi_cmd_task
*ctask
)
235 atomic_inc(&ctask
->refcount
);
238 static void __iscsi_put_ctask(struct iscsi_cmd_task
*ctask
)
240 if (atomic_dec_and_test(&ctask
->refcount
))
241 iscsi_complete_command(ctask
);
245 * iscsi_cmd_rsp - SCSI Command Response processing
246 * @conn: iscsi connection
248 * @ctask: scsi command task
249 * @data: cmd data buffer
250 * @datalen: len of buffer
252 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
253 * then completes the command and task.
255 static void iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
256 struct iscsi_cmd_task
*ctask
, char *data
,
259 struct iscsi_cmd_rsp
*rhdr
= (struct iscsi_cmd_rsp
*)hdr
;
260 struct iscsi_session
*session
= conn
->session
;
261 struct scsi_cmnd
*sc
= ctask
->sc
;
263 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
264 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
266 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
268 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
269 sc
->result
= DID_ERROR
<< 16;
273 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
278 printk(KERN_ERR
"iscsi: Got CHECK_CONDITION but "
279 "invalid data buffer size of %d\n", datalen
);
280 sc
->result
= DID_BAD_TARGET
<< 16;
284 senselen
= be16_to_cpu(get_unaligned((__be16
*) data
));
285 if (datalen
< senselen
)
286 goto invalid_datalen
;
288 memcpy(sc
->sense_buffer
, data
+ 2,
289 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
290 debug_scsi("copied %d bytes of sense\n",
291 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
294 if (sc
->sc_data_direction
== DMA_TO_DEVICE
)
297 if (rhdr
->flags
& ISCSI_FLAG_CMD_UNDERFLOW
) {
298 int res_count
= be32_to_cpu(rhdr
->residual_count
);
300 if (res_count
> 0 && res_count
<= sc
->request_bufflen
)
301 sc
->resid
= res_count
;
303 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
304 } else if (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_UNDERFLOW
)
305 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
306 else if (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
)
307 sc
->resid
= be32_to_cpu(rhdr
->residual_count
);
310 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
311 (long)sc
, sc
->result
, ctask
->itt
);
312 conn
->scsirsp_pdus_cnt
++;
314 __iscsi_put_ctask(ctask
);
317 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
319 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
321 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
322 conn
->tmfrsp_pdus_cnt
++;
324 if (conn
->tmabort_state
!= TMABORT_INITIAL
)
327 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
328 conn
->tmabort_state
= TMABORT_SUCCESS
;
329 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
330 conn
->tmabort_state
= TMABORT_NOT_FOUND
;
332 conn
->tmabort_state
= TMABORT_FAILED
;
333 wake_up(&conn
->ehwait
);
336 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
337 char *data
, int datalen
)
339 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
340 struct iscsi_hdr rejected_pdu
;
343 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
345 if (reject
->reason
== ISCSI_REASON_DATA_DIGEST_ERROR
) {
346 if (ntoh24(reject
->dlength
) > datalen
)
347 return ISCSI_ERR_PROTO
;
349 if (ntoh24(reject
->dlength
) >= sizeof(struct iscsi_hdr
)) {
350 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
351 itt
= get_itt(rejected_pdu
.itt
);
352 printk(KERN_ERR
"itt 0x%x had pdu (op 0x%x) rejected "
353 "due to DataDigest error.\n", itt
,
354 rejected_pdu
.opcode
);
361 * __iscsi_complete_pdu - complete pdu
365 * @datalen: len of data buffer
367 * Completes pdu processing by freeing any resources allocated at
368 * queuecommand or send generic. session lock must be held and verify
369 * itt must have been called.
371 int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
372 char *data
, int datalen
)
374 struct iscsi_session
*session
= conn
->session
;
375 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
376 struct iscsi_cmd_task
*ctask
;
377 struct iscsi_mgmt_task
*mtask
;
380 if (hdr
->itt
!= RESERVED_ITT
)
381 itt
= get_itt(hdr
->itt
);
385 if (itt
< session
->cmds_max
) {
386 ctask
= session
->cmds
[itt
];
388 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
389 opcode
, conn
->id
, ctask
->itt
, datalen
);
392 case ISCSI_OP_SCSI_CMD_RSP
:
393 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
394 iscsi_scsi_cmd_rsp(conn
, hdr
, ctask
, data
,
397 case ISCSI_OP_SCSI_DATA_IN
:
398 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
399 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
400 conn
->scsirsp_pdus_cnt
++;
401 __iscsi_put_ctask(ctask
);
405 /* LLD handles this for now */
408 rc
= ISCSI_ERR_BAD_OPCODE
;
411 } else if (itt
>= ISCSI_MGMT_ITT_OFFSET
&&
412 itt
< ISCSI_MGMT_ITT_OFFSET
+ session
->mgmtpool_max
) {
413 mtask
= session
->mgmt_cmds
[itt
- ISCSI_MGMT_ITT_OFFSET
];
415 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
416 opcode
, conn
->id
, mtask
->itt
, datalen
);
418 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
420 case ISCSI_OP_LOGOUT_RSP
:
422 rc
= ISCSI_ERR_PROTO
;
425 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
427 case ISCSI_OP_LOGIN_RSP
:
428 case ISCSI_OP_TEXT_RSP
:
430 * login related PDU's exp_statsn is handled in
433 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
434 rc
= ISCSI_ERR_CONN_FAILED
;
435 list_del(&mtask
->running
);
436 if (conn
->login_mtask
!= mtask
)
437 __kfifo_put(session
->mgmtpool
.queue
,
438 (void*)&mtask
, sizeof(void*));
440 case ISCSI_OP_SCSI_TMFUNC_RSP
:
442 rc
= ISCSI_ERR_PROTO
;
446 iscsi_tmf_rsp(conn
, hdr
);
448 case ISCSI_OP_NOOP_IN
:
449 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) || datalen
) {
450 rc
= ISCSI_ERR_PROTO
;
453 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
455 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
456 rc
= ISCSI_ERR_CONN_FAILED
;
457 list_del(&mtask
->running
);
458 if (conn
->login_mtask
!= mtask
)
459 __kfifo_put(session
->mgmtpool
.queue
,
460 (void*)&mtask
, sizeof(void*));
463 rc
= ISCSI_ERR_BAD_OPCODE
;
466 } else if (itt
== ~0U) {
467 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
470 case ISCSI_OP_NOOP_IN
:
472 rc
= ISCSI_ERR_PROTO
;
476 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
479 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, NULL
, 0))
480 rc
= ISCSI_ERR_CONN_FAILED
;
482 case ISCSI_OP_REJECT
:
483 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
485 case ISCSI_OP_ASYNC_EVENT
:
486 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
487 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
488 rc
= ISCSI_ERR_CONN_FAILED
;
491 rc
= ISCSI_ERR_BAD_OPCODE
;
495 rc
= ISCSI_ERR_BAD_ITT
;
499 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu
);
501 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
502 char *data
, int datalen
)
506 spin_lock(&conn
->session
->lock
);
507 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
508 spin_unlock(&conn
->session
->lock
);
511 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
513 /* verify itt (itt encoding: age+cid+itt) */
514 int iscsi_verify_itt(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
517 struct iscsi_session
*session
= conn
->session
;
518 struct iscsi_cmd_task
*ctask
;
521 if (hdr
->itt
!= RESERVED_ITT
) {
522 if (((__force u32
)hdr
->itt
& ISCSI_AGE_MASK
) !=
523 (session
->age
<< ISCSI_AGE_SHIFT
)) {
524 printk(KERN_ERR
"iscsi: received itt %x expected "
525 "session age (%x)\n", (__force u32
)hdr
->itt
,
526 session
->age
& ISCSI_AGE_MASK
);
527 return ISCSI_ERR_BAD_ITT
;
530 if (((__force u32
)hdr
->itt
& ISCSI_CID_MASK
) !=
531 (conn
->id
<< ISCSI_CID_SHIFT
)) {
532 printk(KERN_ERR
"iscsi: received itt %x, expected "
533 "CID (%x)\n", (__force u32
)hdr
->itt
, conn
->id
);
534 return ISCSI_ERR_BAD_ITT
;
536 itt
= get_itt(hdr
->itt
);
540 if (itt
< session
->cmds_max
) {
541 ctask
= session
->cmds
[itt
];
544 printk(KERN_INFO
"iscsi: dropping ctask with "
545 "itt 0x%x\n", ctask
->itt
);
547 return ISCSI_ERR_NO_SCSI_CMD
;
550 if (ctask
->sc
->SCp
.phase
!= session
->age
) {
551 printk(KERN_ERR
"iscsi: ctask's session age %d, "
552 "expected %d\n", ctask
->sc
->SCp
.phase
,
554 return ISCSI_ERR_SESSION_FAILED
;
561 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
563 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
565 struct iscsi_session
*session
= conn
->session
;
568 spin_lock_irqsave(&session
->lock
, flags
);
569 if (session
->state
== ISCSI_STATE_FAILED
) {
570 spin_unlock_irqrestore(&session
->lock
, flags
);
574 if (conn
->stop_stage
== 0)
575 session
->state
= ISCSI_STATE_FAILED
;
576 spin_unlock_irqrestore(&session
->lock
, flags
);
577 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
578 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
579 iscsi_conn_error(conn
->cls_conn
, err
);
581 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
583 static void iscsi_prep_mtask(struct iscsi_conn
*conn
,
584 struct iscsi_mgmt_task
*mtask
)
586 struct iscsi_session
*session
= conn
->session
;
587 struct iscsi_hdr
*hdr
= mtask
->hdr
;
588 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
590 if (hdr
->opcode
!= (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) &&
591 hdr
->opcode
!= (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
592 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
594 * pre-format CmdSN for outgoing PDU.
596 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
597 if (hdr
->itt
!= RESERVED_ITT
) {
598 hdr
->itt
= build_itt(mtask
->itt
, conn
->id
, session
->age
);
599 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
600 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
604 if (session
->tt
->init_mgmt_task
)
605 session
->tt
->init_mgmt_task(conn
, mtask
);
607 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
608 hdr
->opcode
, hdr
->itt
, mtask
->data_count
);
611 static int iscsi_xmit_mtask(struct iscsi_conn
*conn
)
613 struct iscsi_hdr
*hdr
= conn
->mtask
->hdr
;
614 int rc
, was_logout
= 0;
616 spin_unlock_bh(&conn
->session
->lock
);
617 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
) {
618 conn
->session
->state
= ISCSI_STATE_IN_RECOVERY
;
619 iscsi_block_session(session_to_cls(conn
->session
));
622 rc
= conn
->session
->tt
->xmit_mgmt_task(conn
, conn
->mtask
);
623 spin_lock_bh(&conn
->session
->lock
);
627 /* done with this in-progress mtask */
631 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
637 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn
*conn
)
639 struct iscsi_session
*session
= conn
->session
;
642 * Check for iSCSI window and take care of CmdSN wrap-around
644 if (!iscsi_sna_lte(session
->cmdsn
, session
->max_cmdsn
)) {
645 debug_scsi("iSCSI CmdSN closed. MaxCmdSN %u CmdSN %u\n",
646 session
->max_cmdsn
, session
->cmdsn
);
652 static int iscsi_xmit_ctask(struct iscsi_conn
*conn
)
654 struct iscsi_cmd_task
*ctask
= conn
->ctask
;
658 * serialize with TMF AbortTask
660 if (ctask
->state
== ISCSI_TASK_ABORTING
)
663 __iscsi_get_ctask(ctask
);
664 spin_unlock_bh(&conn
->session
->lock
);
665 rc
= conn
->session
->tt
->xmit_cmd_task(conn
, ctask
);
666 spin_lock_bh(&conn
->session
->lock
);
667 __iscsi_put_ctask(ctask
);
671 /* done with this ctask */
677 * iscsi_data_xmit - xmit any command into the scheduled connection
678 * @conn: iscsi connection
681 * The function can return -EAGAIN in which case the caller must
682 * re-schedule it again later or recover. '0' return code means
685 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
689 spin_lock_bh(&conn
->session
->lock
);
690 if (unlikely(conn
->suspend_tx
)) {
691 debug_scsi("conn %d Tx suspended!\n", conn
->id
);
692 spin_unlock_bh(&conn
->session
->lock
);
697 rc
= iscsi_xmit_ctask(conn
);
703 rc
= iscsi_xmit_mtask(conn
);
709 * process mgmt pdus like nops before commands since we should
710 * only have one nop-out as a ping from us and targets should not
711 * overflow us with nop-ins
714 while (__kfifo_get(conn
->mgmtqueue
, (void*)&conn
->mtask
,
716 iscsi_prep_mtask(conn
, conn
->mtask
);
717 list_add_tail(&conn
->mtask
->running
, &conn
->mgmt_run_list
);
718 rc
= iscsi_xmit_mtask(conn
);
723 /* process command queue */
724 while (!list_empty(&conn
->xmitqueue
)) {
725 rc
= iscsi_check_cmdsn_window_closed(conn
);
727 spin_unlock_bh(&conn
->session
->lock
);
731 * iscsi tcp may readd the task to the xmitqueue to send
734 conn
->ctask
= list_entry(conn
->xmitqueue
.next
,
735 struct iscsi_cmd_task
, running
);
736 if (conn
->ctask
->state
== ISCSI_TASK_PENDING
) {
737 iscsi_prep_scsi_cmd_pdu(conn
->ctask
);
738 conn
->session
->tt
->init_cmd_task(conn
->ctask
);
740 conn
->ctask
->state
= ISCSI_TASK_RUNNING
;
741 list_move_tail(conn
->xmitqueue
.next
, &conn
->run_list
);
742 rc
= iscsi_xmit_ctask(conn
);
746 * we could continuously get new ctask requests so
747 * we need to check the mgmt queue for nops that need to
748 * be sent to aviod starvation
750 if (__kfifo_len(conn
->mgmtqueue
))
753 spin_unlock_bh(&conn
->session
->lock
);
757 if (unlikely(conn
->suspend_tx
))
759 spin_unlock_bh(&conn
->session
->lock
);
763 static void iscsi_xmitworker(struct work_struct
*work
)
765 struct iscsi_conn
*conn
=
766 container_of(work
, struct iscsi_conn
, xmitwork
);
769 * serialize Xmit worker on a per-connection basis.
772 rc
= iscsi_data_xmit(conn
);
773 } while (rc
>= 0 || rc
== -EAGAIN
);
777 FAILURE_BAD_HOST
= 1,
778 FAILURE_SESSION_FAILED
,
779 FAILURE_SESSION_FREED
,
780 FAILURE_WINDOW_CLOSED
,
782 FAILURE_SESSION_TERMINATE
,
783 FAILURE_SESSION_IN_RECOVERY
,
784 FAILURE_SESSION_RECOVERY_TIMEOUT
,
787 int iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
789 struct Scsi_Host
*host
;
791 struct iscsi_session
*session
;
792 struct iscsi_conn
*conn
;
793 struct iscsi_cmd_task
*ctask
= NULL
;
795 sc
->scsi_done
= done
;
799 host
= sc
->device
->host
;
800 session
= iscsi_hostdata(host
->hostdata
);
802 spin_lock(&session
->lock
);
805 * ISCSI_STATE_FAILED is a temp. state. The recovery
806 * code will decide what is best to do with command queued
809 if (session
->state
!= ISCSI_STATE_LOGGED_IN
&&
810 session
->state
!= ISCSI_STATE_FAILED
) {
812 * to handle the race between when we set the recovery state
813 * and block the session we requeue here (commands could
814 * be entering our queuecommand while a block is starting
815 * up because the block code is not locked)
817 if (session
->state
== ISCSI_STATE_IN_RECOVERY
) {
818 reason
= FAILURE_SESSION_IN_RECOVERY
;
822 if (session
->state
== ISCSI_STATE_RECOVERY_FAILED
)
823 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
824 else if (session
->state
== ISCSI_STATE_TERMINATE
)
825 reason
= FAILURE_SESSION_TERMINATE
;
827 reason
= FAILURE_SESSION_FREED
;
831 conn
= session
->leadconn
;
833 reason
= FAILURE_SESSION_FREED
;
838 * We check this here and in data xmit, because if we get to the point
839 * that this check is hitting the window then we have enough IO in
840 * flight and enough IO waiting to be transmitted it is better
841 * to let the scsi/block layer queue up.
843 if (iscsi_check_cmdsn_window_closed(conn
)) {
844 reason
= FAILURE_WINDOW_CLOSED
;
848 if (!__kfifo_get(session
->cmdpool
.queue
, (void*)&ctask
,
850 reason
= FAILURE_OOM
;
853 sc
->SCp
.phase
= session
->age
;
854 sc
->SCp
.ptr
= (char *)ctask
;
856 atomic_set(&ctask
->refcount
, 1);
857 ctask
->state
= ISCSI_TASK_PENDING
;
861 INIT_LIST_HEAD(&ctask
->running
);
863 list_add_tail(&ctask
->running
, &conn
->xmitqueue
);
864 spin_unlock(&session
->lock
);
866 scsi_queue_work(host
, &conn
->xmitwork
);
870 spin_unlock(&session
->lock
);
871 debug_scsi("cmd 0x%x rejected (%d)\n", sc
->cmnd
[0], reason
);
872 return SCSI_MLQUEUE_HOST_BUSY
;
875 spin_unlock(&session
->lock
);
876 printk(KERN_ERR
"iscsi: cmd 0x%x is not queued (%d)\n",
877 sc
->cmnd
[0], reason
);
878 sc
->result
= (DID_NO_CONNECT
<< 16);
879 sc
->resid
= sc
->request_bufflen
;
883 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
885 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
)
887 if (depth
> ISCSI_MAX_CMD_PER_LUN
)
888 depth
= ISCSI_MAX_CMD_PER_LUN
;
889 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
890 return sdev
->queue_depth
;
892 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
894 static struct iscsi_mgmt_task
*
895 __iscsi_conn_send_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
896 char *data
, uint32_t data_size
)
898 struct iscsi_session
*session
= conn
->session
;
899 struct iscsi_mgmt_task
*mtask
;
901 if (session
->state
== ISCSI_STATE_TERMINATE
)
904 if (hdr
->opcode
== (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) ||
905 hdr
->opcode
== (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
907 * Login and Text are sent serially, in
908 * request-followed-by-response sequence.
909 * Same mtask can be used. Same ITT must be used.
910 * Note that login_mtask is preallocated at conn_create().
912 mtask
= conn
->login_mtask
;
914 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
915 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
917 if (!__kfifo_get(session
->mgmtpool
.queue
,
918 (void*)&mtask
, sizeof(void*)))
923 memcpy(mtask
->data
, data
, data_size
);
924 mtask
->data_count
= data_size
;
926 mtask
->data_count
= 0;
928 INIT_LIST_HEAD(&mtask
->running
);
929 memcpy(mtask
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
930 __kfifo_put(conn
->mgmtqueue
, (void*)&mtask
, sizeof(void*));
934 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
935 char *data
, uint32_t data_size
)
937 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
938 struct iscsi_session
*session
= conn
->session
;
941 spin_lock_bh(&session
->lock
);
942 if (!__iscsi_conn_send_pdu(conn
, hdr
, data
, data_size
))
944 spin_unlock_bh(&session
->lock
);
945 scsi_queue_work(session
->host
, &conn
->xmitwork
);
948 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
950 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
952 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
953 struct iscsi_conn
*conn
= session
->leadconn
;
955 spin_lock_bh(&session
->lock
);
956 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
957 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
959 wake_up(&conn
->ehwait
);
961 spin_unlock_bh(&session
->lock
);
963 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
965 int iscsi_eh_host_reset(struct scsi_cmnd
*sc
)
967 struct Scsi_Host
*host
= sc
->device
->host
;
968 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
969 struct iscsi_conn
*conn
= session
->leadconn
;
970 int fail_session
= 0;
972 spin_lock_bh(&session
->lock
);
973 if (session
->state
== ISCSI_STATE_TERMINATE
) {
975 debug_scsi("failing host reset: session terminated "
976 "[CID %d age %d]\n", conn
->id
, session
->age
);
977 spin_unlock_bh(&session
->lock
);
981 if (sc
->SCp
.phase
== session
->age
) {
982 debug_scsi("failing connection CID %d due to SCSI host reset\n",
986 spin_unlock_bh(&session
->lock
);
989 * we drop the lock here but the leadconn cannot be destoyed while
990 * we are in the scsi eh
993 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
995 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
996 wait_event_interruptible(conn
->ehwait
,
997 session
->state
== ISCSI_STATE_TERMINATE
||
998 session
->state
== ISCSI_STATE_LOGGED_IN
||
999 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
1000 if (signal_pending(current
))
1001 flush_signals(current
);
1003 spin_lock_bh(&session
->lock
);
1004 if (session
->state
== ISCSI_STATE_LOGGED_IN
)
1005 printk(KERN_INFO
"iscsi: host reset succeeded\n");
1008 spin_unlock_bh(&session
->lock
);
1012 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset
);
1014 static void iscsi_tmabort_timedout(unsigned long data
)
1016 struct iscsi_cmd_task
*ctask
= (struct iscsi_cmd_task
*)data
;
1017 struct iscsi_conn
*conn
= ctask
->conn
;
1018 struct iscsi_session
*session
= conn
->session
;
1020 spin_lock(&session
->lock
);
1021 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
1022 conn
->tmabort_state
= TMABORT_TIMEDOUT
;
1023 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1024 ctask
->sc
, ctask
->itt
);
1025 /* unblock eh_abort() */
1026 wake_up(&conn
->ehwait
);
1028 spin_unlock(&session
->lock
);
1031 static int iscsi_exec_abort_task(struct scsi_cmnd
*sc
,
1032 struct iscsi_cmd_task
*ctask
)
1034 struct iscsi_conn
*conn
= ctask
->conn
;
1035 struct iscsi_session
*session
= conn
->session
;
1036 struct iscsi_tm
*hdr
= &conn
->tmhdr
;
1039 * ctask timed out but session is OK requests must be serialized.
1041 memset(hdr
, 0, sizeof(struct iscsi_tm
));
1042 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1043 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
;
1044 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1045 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
1046 hdr
->rtt
= ctask
->hdr
->itt
;
1047 hdr
->refcmdsn
= ctask
->hdr
->cmdsn
;
1049 ctask
->mtask
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)hdr
,
1051 if (!ctask
->mtask
) {
1052 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1053 debug_scsi("abort sent failure [itt 0x%x]\n", ctask
->itt
);
1056 ctask
->state
= ISCSI_TASK_ABORTING
;
1058 debug_scsi("abort sent [itt 0x%x]\n", ctask
->itt
);
1060 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
1061 conn
->tmfcmd_pdus_cnt
++;
1062 conn
->tmabort_timer
.expires
= 20*HZ
+ jiffies
;
1063 conn
->tmabort_timer
.function
= iscsi_tmabort_timedout
;
1064 conn
->tmabort_timer
.data
= (unsigned long)ctask
;
1065 add_timer(&conn
->tmabort_timer
);
1066 debug_scsi("abort set timeout [itt 0x%x]\n", ctask
->itt
);
1068 spin_unlock_bh(&session
->lock
);
1069 scsi_queue_work(session
->host
, &conn
->xmitwork
);
1072 * block eh thread until:
1076 * 3) session is terminated or restarted or userspace has
1077 * given up on recovery
1079 wait_event_interruptible(conn
->ehwait
,
1080 sc
->SCp
.phase
!= session
->age
||
1081 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1082 conn
->tmabort_state
!= TMABORT_INITIAL
);
1083 if (signal_pending(current
))
1084 flush_signals(current
);
1085 del_timer_sync(&conn
->tmabort_timer
);
1086 spin_lock_bh(&session
->lock
);
1091 * session lock must be held
1093 static struct iscsi_mgmt_task
*
1094 iscsi_remove_mgmt_task(struct kfifo
*fifo
, uint32_t itt
)
1096 int i
, nr_tasks
= __kfifo_len(fifo
) / sizeof(void*);
1097 struct iscsi_mgmt_task
*task
;
1099 debug_scsi("searching %d tasks\n", nr_tasks
);
1101 for (i
= 0; i
< nr_tasks
; i
++) {
1102 __kfifo_get(fifo
, (void*)&task
, sizeof(void*));
1103 debug_scsi("check task %u\n", task
->itt
);
1105 if (task
->itt
== itt
) {
1106 debug_scsi("matched task\n");
1110 __kfifo_put(fifo
, (void*)&task
, sizeof(void*));
1115 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task
*ctask
)
1117 struct iscsi_conn
*conn
= ctask
->conn
;
1118 struct iscsi_session
*session
= conn
->session
;
1123 if (!iscsi_remove_mgmt_task(conn
->mgmtqueue
, ctask
->mtask
->itt
))
1124 list_del(&ctask
->mtask
->running
);
1125 __kfifo_put(session
->mgmtpool
.queue
, (void*)&ctask
->mtask
,
1127 ctask
->mtask
= NULL
;
1132 * session lock must be held
1134 static void fail_command(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1137 struct scsi_cmnd
*sc
;
1143 if (ctask
->state
!= ISCSI_TASK_PENDING
)
1144 conn
->session
->tt
->cleanup_cmd_task(conn
, ctask
);
1145 iscsi_ctask_mtask_cleanup(ctask
);
1148 sc
->resid
= sc
->request_bufflen
;
1149 if (conn
->ctask
== ctask
)
1151 /* release ref from queuecommand */
1152 __iscsi_put_ctask(ctask
);
1155 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
1157 struct iscsi_cmd_task
*ctask
;
1158 struct iscsi_conn
*conn
;
1159 struct iscsi_session
*session
;
1163 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1167 debug_scsi("sc never reached iscsi layer or it completed.\n");
1171 ctask
= (struct iscsi_cmd_task
*)sc
->SCp
.ptr
;
1173 session
= conn
->session
;
1175 conn
->eh_abort_cnt
++;
1176 debug_scsi("aborting [sc %p itt 0x%x]\n", sc
, ctask
->itt
);
1178 spin_lock_bh(&session
->lock
);
1181 * If we are not logged in or we have started a new session
1182 * then let the host reset code handle this
1184 if (session
->state
!= ISCSI_STATE_LOGGED_IN
||
1185 sc
->SCp
.phase
!= session
->age
)
1188 /* ctask completed before time out */
1190 debug_scsi("sc completed while abort in progress\n");
1194 /* what should we do here ? */
1195 if (conn
->ctask
== ctask
) {
1196 printk(KERN_INFO
"iscsi: sc %p itt 0x%x partially sent. "
1197 "Failing abort\n", sc
, ctask
->itt
);
1201 if (ctask
->state
== ISCSI_TASK_PENDING
) {
1202 fail_command(conn
, ctask
, DID_ABORT
<< 16);
1206 conn
->tmabort_state
= TMABORT_INITIAL
;
1207 rc
= iscsi_exec_abort_task(sc
, ctask
);
1208 if (rc
|| sc
->SCp
.phase
!= session
->age
||
1209 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1211 iscsi_ctask_mtask_cleanup(ctask
);
1213 switch (conn
->tmabort_state
) {
1214 case TMABORT_SUCCESS
:
1215 spin_unlock_bh(&session
->lock
);
1217 * clean up task if aborted. grab the recv lock as a writer
1219 write_lock_bh(conn
->recv_lock
);
1220 spin_lock(&session
->lock
);
1221 fail_command(conn
, ctask
, DID_ABORT
<< 16);
1222 spin_unlock(&session
->lock
);
1223 write_unlock_bh(conn
->recv_lock
);
1225 * make sure xmit thread is not still touching the
1228 scsi_flush_work(session
->host
);
1229 goto success_unlocked
;
1230 case TMABORT_NOT_FOUND
:
1232 /* ctask completed before tmf abort response */
1233 debug_scsi("sc completed while abort in progress\n");
1238 /* timedout or failed */
1239 spin_unlock_bh(&session
->lock
);
1240 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1241 goto failed_unlocked
;
1245 spin_unlock_bh(&session
->lock
);
1247 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1251 spin_unlock_bh(&session
->lock
);
1253 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1256 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
1259 iscsi_pool_init(struct iscsi_queue
*q
, int max
, void ***items
, int item_size
)
1263 *items
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
1268 q
->pool
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
1269 if (q
->pool
== NULL
) {
1274 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
1276 if (q
->queue
== ERR_PTR(-ENOMEM
)) {
1282 for (i
= 0; i
< max
; i
++) {
1283 q
->pool
[i
] = kmalloc(item_size
, GFP_KERNEL
);
1284 if (q
->pool
[i
] == NULL
) {
1287 for (j
= 0; j
< i
; j
++)
1290 kfifo_free(q
->queue
);
1295 memset(q
->pool
[i
], 0, item_size
);
1296 (*items
)[i
] = q
->pool
[i
];
1297 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
1301 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
1303 void iscsi_pool_free(struct iscsi_queue
*q
, void **items
)
1307 for (i
= 0; i
< q
->max
; i
++)
1312 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
1315 * iSCSI Session's hostdata organization:
1317 * *------------------* <== hostdata_session(host->hostdata)
1318 * | ptr to class sess|
1319 * |------------------| <== iscsi_hostdata(host->hostdata)
1321 * *------------------*
1324 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1325 _sz % sizeof(unsigned long))
1327 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1330 * iscsi_session_setup - create iscsi cls session and host and session
1331 * @scsit: scsi transport template
1332 * @iscsit: iscsi transport template
1333 * @initial_cmdsn: initial CmdSN
1334 * @hostno: host no allocated
1336 * This can be used by software iscsi_transports that allocate
1337 * a session per scsi host.
1339 struct iscsi_cls_session
*
1340 iscsi_session_setup(struct iscsi_transport
*iscsit
,
1341 struct scsi_transport_template
*scsit
,
1342 int cmd_task_size
, int mgmt_task_size
,
1343 uint32_t initial_cmdsn
, uint32_t *hostno
)
1345 struct Scsi_Host
*shost
;
1346 struct iscsi_session
*session
;
1347 struct iscsi_cls_session
*cls_session
;
1350 shost
= scsi_host_alloc(iscsit
->host_template
,
1351 hostdata_privsize(sizeof(*session
)));
1356 shost
->max_channel
= 0;
1357 shost
->max_lun
= iscsit
->max_lun
;
1358 shost
->max_cmd_len
= iscsit
->max_cmd_len
;
1359 shost
->transportt
= scsit
;
1360 shost
->transportt
->create_work_queue
= 1;
1361 *hostno
= shost
->host_no
;
1363 session
= iscsi_hostdata(shost
->hostdata
);
1364 memset(session
, 0, sizeof(struct iscsi_session
));
1365 session
->host
= shost
;
1366 session
->state
= ISCSI_STATE_FREE
;
1367 session
->mgmtpool_max
= ISCSI_MGMT_CMDS_MAX
;
1368 session
->cmds_max
= ISCSI_XMIT_CMDS_MAX
;
1369 session
->cmdsn
= initial_cmdsn
;
1370 session
->exp_cmdsn
= initial_cmdsn
+ 1;
1371 session
->max_cmdsn
= initial_cmdsn
+ 1;
1372 session
->max_r2t
= 1;
1373 session
->tt
= iscsit
;
1375 /* initialize SCSI PDU commands pool */
1376 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
1377 (void***)&session
->cmds
,
1378 cmd_task_size
+ sizeof(struct iscsi_cmd_task
)))
1379 goto cmdpool_alloc_fail
;
1381 /* pre-format cmds pool with ITT */
1382 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
1383 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
1386 ctask
->dd_data
= &ctask
[1];
1388 INIT_LIST_HEAD(&ctask
->running
);
1391 spin_lock_init(&session
->lock
);
1393 /* initialize immediate command pool */
1394 if (iscsi_pool_init(&session
->mgmtpool
, session
->mgmtpool_max
,
1395 (void***)&session
->mgmt_cmds
,
1396 mgmt_task_size
+ sizeof(struct iscsi_mgmt_task
)))
1397 goto mgmtpool_alloc_fail
;
1400 /* pre-format immediate cmds pool with ITT */
1401 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++) {
1402 struct iscsi_mgmt_task
*mtask
= session
->mgmt_cmds
[cmd_i
];
1405 mtask
->dd_data
= &mtask
[1];
1406 mtask
->itt
= ISCSI_MGMT_ITT_OFFSET
+ cmd_i
;
1407 INIT_LIST_HEAD(&mtask
->running
);
1410 if (scsi_add_host(shost
, NULL
))
1413 if (!try_module_get(iscsit
->owner
))
1414 goto cls_session_fail
;
1416 cls_session
= iscsi_create_session(shost
, iscsit
, 0);
1419 *(unsigned long*)shost
->hostdata
= (unsigned long)cls_session
;
1424 module_put(iscsit
->owner
);
1426 scsi_remove_host(shost
);
1428 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
1429 mgmtpool_alloc_fail
:
1430 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
1432 scsi_host_put(shost
);
1435 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
1438 * iscsi_session_teardown - destroy session, host, and cls_session
1441 * This can be used by software iscsi_transports that allocate
1442 * a session per scsi host.
1444 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
1446 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1447 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1448 struct module
*owner
= cls_session
->transport
->owner
;
1450 scsi_remove_host(shost
);
1452 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
1453 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
1455 kfree(session
->password
);
1456 kfree(session
->password_in
);
1457 kfree(session
->username
);
1458 kfree(session
->username_in
);
1459 kfree(session
->targetname
);
1460 kfree(session
->hwaddress
);
1461 kfree(session
->initiatorname
);
1463 iscsi_destroy_session(cls_session
);
1464 scsi_host_put(shost
);
1467 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
1470 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1471 * @cls_session: iscsi_cls_session
1474 struct iscsi_cls_conn
*
1475 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, uint32_t conn_idx
)
1477 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1478 struct iscsi_conn
*conn
;
1479 struct iscsi_cls_conn
*cls_conn
;
1482 cls_conn
= iscsi_create_conn(cls_session
, conn_idx
);
1485 conn
= cls_conn
->dd_data
;
1486 memset(conn
, 0, sizeof(*conn
));
1488 conn
->session
= session
;
1489 conn
->cls_conn
= cls_conn
;
1490 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
1491 conn
->id
= conn_idx
;
1492 conn
->exp_statsn
= 0;
1493 conn
->tmabort_state
= TMABORT_INITIAL
;
1494 INIT_LIST_HEAD(&conn
->run_list
);
1495 INIT_LIST_HEAD(&conn
->mgmt_run_list
);
1496 INIT_LIST_HEAD(&conn
->xmitqueue
);
1498 /* initialize general immediate & non-immediate PDU commands queue */
1499 conn
->mgmtqueue
= kfifo_alloc(session
->mgmtpool_max
* sizeof(void*),
1501 if (conn
->mgmtqueue
== ERR_PTR(-ENOMEM
))
1502 goto mgmtqueue_alloc_fail
;
1504 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
1506 /* allocate login_mtask used for the login/text sequences */
1507 spin_lock_bh(&session
->lock
);
1508 if (!__kfifo_get(session
->mgmtpool
.queue
,
1509 (void*)&conn
->login_mtask
,
1511 spin_unlock_bh(&session
->lock
);
1512 goto login_mtask_alloc_fail
;
1514 spin_unlock_bh(&session
->lock
);
1516 data
= kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN
, GFP_KERNEL
);
1518 goto login_mtask_data_alloc_fail
;
1519 conn
->login_mtask
->data
= conn
->data
= data
;
1521 init_timer(&conn
->tmabort_timer
);
1522 init_waitqueue_head(&conn
->ehwait
);
1526 login_mtask_data_alloc_fail
:
1527 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1529 login_mtask_alloc_fail
:
1530 kfifo_free(conn
->mgmtqueue
);
1531 mgmtqueue_alloc_fail
:
1532 iscsi_destroy_conn(cls_conn
);
1535 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
1538 * iscsi_conn_teardown - teardown iscsi connection
1539 * cls_conn: iscsi class connection
1541 * TODO: we may need to make this into a two step process
1542 * like scsi-mls remove + put host
1544 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
1546 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1547 struct iscsi_session
*session
= conn
->session
;
1548 unsigned long flags
;
1550 spin_lock_bh(&session
->lock
);
1551 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1552 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
1553 if (session
->leadconn
== conn
) {
1555 * leading connection? then give up on recovery.
1557 session
->state
= ISCSI_STATE_TERMINATE
;
1558 wake_up(&conn
->ehwait
);
1560 spin_unlock_bh(&session
->lock
);
1563 * Block until all in-progress commands for this connection
1567 spin_lock_irqsave(session
->host
->host_lock
, flags
);
1568 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
1569 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1572 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1573 msleep_interruptible(500);
1574 printk(KERN_INFO
"iscsi: scsi conn_destroy(): host_busy %d "
1575 "host_failed %d\n", session
->host
->host_busy
,
1576 session
->host
->host_failed
);
1578 * force eh_abort() to unblock
1580 wake_up(&conn
->ehwait
);
1583 /* flush queued up work because we free the connection below */
1584 scsi_flush_work(session
->host
);
1586 spin_lock_bh(&session
->lock
);
1588 kfree(conn
->persistent_address
);
1589 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1591 if (session
->leadconn
== conn
) {
1592 session
->leadconn
= NULL
;
1593 /* no connections exits.. reset sequencing */
1594 session
->cmdsn
= session
->max_cmdsn
= session
->exp_cmdsn
= 1;
1596 spin_unlock_bh(&session
->lock
);
1598 kfifo_free(conn
->mgmtqueue
);
1600 iscsi_destroy_conn(cls_conn
);
1602 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
1604 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
1606 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1607 struct iscsi_session
*session
= conn
->session
;
1610 printk(KERN_ERR
"iscsi: can't start unbound connection\n");
1614 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
1615 session
->first_burst
> session
->max_burst
) {
1616 printk("iscsi: invalid burst lengths: "
1617 "first_burst %d max_burst %d\n",
1618 session
->first_burst
, session
->max_burst
);
1622 spin_lock_bh(&session
->lock
);
1623 conn
->c_stage
= ISCSI_CONN_STARTED
;
1624 session
->state
= ISCSI_STATE_LOGGED_IN
;
1626 switch(conn
->stop_stage
) {
1627 case STOP_CONN_RECOVER
:
1629 * unblock eh_abort() if it is blocked. re-try all
1630 * commands after successful recovery
1632 conn
->stop_stage
= 0;
1633 conn
->tmabort_state
= TMABORT_INITIAL
;
1635 spin_unlock_bh(&session
->lock
);
1637 iscsi_unblock_session(session_to_cls(session
));
1638 wake_up(&conn
->ehwait
);
1640 case STOP_CONN_TERM
:
1641 conn
->stop_stage
= 0;
1646 spin_unlock_bh(&session
->lock
);
1650 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
1653 flush_control_queues(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
1655 struct iscsi_mgmt_task
*mtask
, *tmp
;
1657 /* handle pending */
1658 while (__kfifo_get(conn
->mgmtqueue
, (void*)&mtask
, sizeof(void*))) {
1659 if (mtask
== conn
->login_mtask
)
1661 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask
->itt
);
1662 __kfifo_put(session
->mgmtpool
.queue
, (void*)&mtask
,
1666 /* handle running */
1667 list_for_each_entry_safe(mtask
, tmp
, &conn
->mgmt_run_list
, running
) {
1668 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask
->itt
);
1669 list_del(&mtask
->running
);
1671 if (mtask
== conn
->login_mtask
)
1673 __kfifo_put(session
->mgmtpool
.queue
, (void*)&mtask
,
1680 /* Fail commands. Mutex and session lock held and recv side suspended */
1681 static void fail_all_commands(struct iscsi_conn
*conn
)
1683 struct iscsi_cmd_task
*ctask
, *tmp
;
1686 list_for_each_entry_safe(ctask
, tmp
, &conn
->xmitqueue
, running
) {
1687 debug_scsi("failing pending sc %p itt 0x%x\n", ctask
->sc
,
1689 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1692 /* fail all other running */
1693 list_for_each_entry_safe(ctask
, tmp
, &conn
->run_list
, running
) {
1694 debug_scsi("failing in progress sc %p itt 0x%x\n",
1695 ctask
->sc
, ctask
->itt
);
1696 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1702 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
1703 struct iscsi_conn
*conn
, int flag
)
1707 spin_lock_bh(&session
->lock
);
1708 if (conn
->stop_stage
== STOP_CONN_TERM
) {
1709 spin_unlock_bh(&session
->lock
);
1714 * When this is called for the in_login state, we only want to clean
1715 * up the login task and connection. We do not need to block and set
1716 * the recovery state again
1718 if (flag
== STOP_CONN_TERM
)
1719 session
->state
= ISCSI_STATE_TERMINATE
;
1720 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
1721 session
->state
= ISCSI_STATE_IN_RECOVERY
;
1723 old_stop_stage
= conn
->stop_stage
;
1724 conn
->stop_stage
= flag
;
1725 conn
->c_stage
= ISCSI_CONN_STOPPED
;
1726 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1727 spin_unlock_bh(&session
->lock
);
1728 scsi_flush_work(session
->host
);
1730 write_lock_bh(conn
->recv_lock
);
1731 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1732 write_unlock_bh(conn
->recv_lock
);
1735 * for connection level recovery we should not calculate
1736 * header digest. conn->hdr_size used for optimization
1737 * in hdr_extract() and will be re-negotiated at
1740 if (flag
== STOP_CONN_RECOVER
) {
1741 conn
->hdrdgst_en
= 0;
1742 conn
->datadgst_en
= 0;
1743 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
1744 old_stop_stage
!= STOP_CONN_RECOVER
) {
1745 debug_scsi("blocking session\n");
1746 iscsi_block_session(session_to_cls(session
));
1753 spin_lock_bh(&session
->lock
);
1754 fail_all_commands(conn
);
1755 flush_control_queues(session
, conn
);
1756 spin_unlock_bh(&session
->lock
);
1759 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
1761 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1762 struct iscsi_session
*session
= conn
->session
;
1765 case STOP_CONN_RECOVER
:
1766 case STOP_CONN_TERM
:
1767 iscsi_start_session_recovery(session
, conn
, flag
);
1770 printk(KERN_ERR
"iscsi: invalid stop flag %d\n", flag
);
1773 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
1775 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
1776 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
1778 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1779 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1781 spin_lock_bh(&session
->lock
);
1783 session
->leadconn
= conn
;
1784 spin_unlock_bh(&session
->lock
);
1787 * Unblock xmitworker(), Login Phase will pass through.
1789 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1790 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1793 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
1796 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
1797 enum iscsi_param param
, char *buf
, int buflen
)
1799 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1800 struct iscsi_session
*session
= conn
->session
;
1804 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
1805 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
1807 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
1808 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
1810 case ISCSI_PARAM_HDRDGST_EN
:
1811 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
1813 case ISCSI_PARAM_DATADGST_EN
:
1814 sscanf(buf
, "%d", &conn
->datadgst_en
);
1816 case ISCSI_PARAM_INITIAL_R2T_EN
:
1817 sscanf(buf
, "%d", &session
->initial_r2t_en
);
1819 case ISCSI_PARAM_MAX_R2T
:
1820 sscanf(buf
, "%d", &session
->max_r2t
);
1822 case ISCSI_PARAM_IMM_DATA_EN
:
1823 sscanf(buf
, "%d", &session
->imm_data_en
);
1825 case ISCSI_PARAM_FIRST_BURST
:
1826 sscanf(buf
, "%d", &session
->first_burst
);
1828 case ISCSI_PARAM_MAX_BURST
:
1829 sscanf(buf
, "%d", &session
->max_burst
);
1831 case ISCSI_PARAM_PDU_INORDER_EN
:
1832 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
1834 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
1835 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
1837 case ISCSI_PARAM_ERL
:
1838 sscanf(buf
, "%d", &session
->erl
);
1840 case ISCSI_PARAM_IFMARKER_EN
:
1841 sscanf(buf
, "%d", &value
);
1844 case ISCSI_PARAM_OFMARKER_EN
:
1845 sscanf(buf
, "%d", &value
);
1848 case ISCSI_PARAM_EXP_STATSN
:
1849 sscanf(buf
, "%u", &conn
->exp_statsn
);
1851 case ISCSI_PARAM_USERNAME
:
1852 kfree(session
->username
);
1853 session
->username
= kstrdup(buf
, GFP_KERNEL
);
1854 if (!session
->username
)
1857 case ISCSI_PARAM_USERNAME_IN
:
1858 kfree(session
->username_in
);
1859 session
->username_in
= kstrdup(buf
, GFP_KERNEL
);
1860 if (!session
->username_in
)
1863 case ISCSI_PARAM_PASSWORD
:
1864 kfree(session
->password
);
1865 session
->password
= kstrdup(buf
, GFP_KERNEL
);
1866 if (!session
->password
)
1869 case ISCSI_PARAM_PASSWORD_IN
:
1870 kfree(session
->password_in
);
1871 session
->password_in
= kstrdup(buf
, GFP_KERNEL
);
1872 if (!session
->password_in
)
1875 case ISCSI_PARAM_TARGET_NAME
:
1876 /* this should not change between logins */
1877 if (session
->targetname
)
1880 session
->targetname
= kstrdup(buf
, GFP_KERNEL
);
1881 if (!session
->targetname
)
1884 case ISCSI_PARAM_TPGT
:
1885 sscanf(buf
, "%d", &session
->tpgt
);
1887 case ISCSI_PARAM_PERSISTENT_PORT
:
1888 sscanf(buf
, "%d", &conn
->persistent_port
);
1890 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
1892 * this is the address returned in discovery so it should
1893 * not change between logins.
1895 if (conn
->persistent_address
)
1898 conn
->persistent_address
= kstrdup(buf
, GFP_KERNEL
);
1899 if (!conn
->persistent_address
)
1908 EXPORT_SYMBOL_GPL(iscsi_set_param
);
1910 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
1911 enum iscsi_param param
, char *buf
)
1913 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1914 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1918 case ISCSI_PARAM_INITIAL_R2T_EN
:
1919 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
1921 case ISCSI_PARAM_MAX_R2T
:
1922 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
1924 case ISCSI_PARAM_IMM_DATA_EN
:
1925 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
1927 case ISCSI_PARAM_FIRST_BURST
:
1928 len
= sprintf(buf
, "%u\n", session
->first_burst
);
1930 case ISCSI_PARAM_MAX_BURST
:
1931 len
= sprintf(buf
, "%u\n", session
->max_burst
);
1933 case ISCSI_PARAM_PDU_INORDER_EN
:
1934 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
1936 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
1937 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
1939 case ISCSI_PARAM_ERL
:
1940 len
= sprintf(buf
, "%d\n", session
->erl
);
1942 case ISCSI_PARAM_TARGET_NAME
:
1943 len
= sprintf(buf
, "%s\n", session
->targetname
);
1945 case ISCSI_PARAM_TPGT
:
1946 len
= sprintf(buf
, "%d\n", session
->tpgt
);
1948 case ISCSI_PARAM_USERNAME
:
1949 len
= sprintf(buf
, "%s\n", session
->username
);
1951 case ISCSI_PARAM_USERNAME_IN
:
1952 len
= sprintf(buf
, "%s\n", session
->username_in
);
1954 case ISCSI_PARAM_PASSWORD
:
1955 len
= sprintf(buf
, "%s\n", session
->password
);
1957 case ISCSI_PARAM_PASSWORD_IN
:
1958 len
= sprintf(buf
, "%s\n", session
->password_in
);
1966 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
1968 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
1969 enum iscsi_param param
, char *buf
)
1971 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1975 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
1976 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
1978 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
1979 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
1981 case ISCSI_PARAM_HDRDGST_EN
:
1982 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
1984 case ISCSI_PARAM_DATADGST_EN
:
1985 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
1987 case ISCSI_PARAM_IFMARKER_EN
:
1988 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
1990 case ISCSI_PARAM_OFMARKER_EN
:
1991 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
1993 case ISCSI_PARAM_EXP_STATSN
:
1994 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
1996 case ISCSI_PARAM_PERSISTENT_PORT
:
1997 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
1999 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2000 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
2008 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
2010 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2013 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2017 case ISCSI_HOST_PARAM_HWADDRESS
:
2018 if (!session
->hwaddress
)
2019 len
= sprintf(buf
, "%s\n", "default");
2021 len
= sprintf(buf
, "%s\n", session
->hwaddress
);
2023 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2024 if (!session
->initiatorname
)
2025 len
= sprintf(buf
, "%s\n", "unknown");
2027 len
= sprintf(buf
, "%s\n", session
->initiatorname
);
2036 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
2038 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2039 char *buf
, int buflen
)
2041 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2044 case ISCSI_HOST_PARAM_HWADDRESS
:
2045 if (!session
->hwaddress
)
2046 session
->hwaddress
= kstrdup(buf
, GFP_KERNEL
);
2048 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2049 if (!session
->initiatorname
)
2050 session
->initiatorname
= kstrdup(buf
, GFP_KERNEL
);
2058 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
2060 MODULE_AUTHOR("Mike Christie");
2061 MODULE_DESCRIPTION("iSCSI library functions");
2062 MODULE_LICENSE("GPL");