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/mutex.h>
26 #include <linux/kfifo.h>
27 #include <linux/delay.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 struct iscsi_session
*
42 class_to_transport_session(struct iscsi_cls_session
*cls_session
)
44 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
45 return iscsi_hostdata(shost
->hostdata
);
47 EXPORT_SYMBOL_GPL(class_to_transport_session
);
49 #define INVALID_SN_DELTA 0xffff
52 iscsi_check_assign_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
54 uint32_t max_cmdsn
= be32_to_cpu(hdr
->max_cmdsn
);
55 uint32_t exp_cmdsn
= be32_to_cpu(hdr
->exp_cmdsn
);
57 if (max_cmdsn
< exp_cmdsn
-1 &&
58 max_cmdsn
> exp_cmdsn
- INVALID_SN_DELTA
)
59 return ISCSI_ERR_MAX_CMDSN
;
60 if (max_cmdsn
> session
->max_cmdsn
||
61 max_cmdsn
< session
->max_cmdsn
- INVALID_SN_DELTA
)
62 session
->max_cmdsn
= max_cmdsn
;
63 if (exp_cmdsn
> session
->exp_cmdsn
||
64 exp_cmdsn
< session
->exp_cmdsn
- INVALID_SN_DELTA
)
65 session
->exp_cmdsn
= exp_cmdsn
;
69 EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn
);
71 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task
*ctask
,
72 struct iscsi_data
*hdr
)
74 struct iscsi_conn
*conn
= ctask
->conn
;
76 memset(hdr
, 0, sizeof(struct iscsi_data
));
77 hdr
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
78 hdr
->datasn
= cpu_to_be32(ctask
->unsol_datasn
);
79 ctask
->unsol_datasn
++;
80 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
81 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
83 hdr
->itt
= ctask
->hdr
->itt
;
84 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
85 hdr
->offset
= cpu_to_be32(ctask
->unsol_offset
);
87 if (ctask
->unsol_count
> conn
->max_xmit_dlength
) {
88 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
89 ctask
->data_count
= conn
->max_xmit_dlength
;
90 ctask
->unsol_offset
+= ctask
->data_count
;
93 hton24(hdr
->dlength
, ctask
->unsol_count
);
94 ctask
->data_count
= ctask
->unsol_count
;
95 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
98 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu
);
101 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
102 * @ctask: iscsi cmd task
104 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
105 * fields like dlength or final based on how much data it sends
107 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task
*ctask
)
109 struct iscsi_conn
*conn
= ctask
->conn
;
110 struct iscsi_session
*session
= conn
->session
;
111 struct iscsi_cmd
*hdr
= ctask
->hdr
;
112 struct scsi_cmnd
*sc
= ctask
->sc
;
114 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
115 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
116 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
117 hdr
->itt
= build_itt(ctask
->itt
, conn
->id
, session
->age
);
118 hdr
->data_length
= cpu_to_be32(sc
->request_bufflen
);
119 hdr
->cmdsn
= cpu_to_be32(session
->cmdsn
);
121 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
122 memcpy(hdr
->cdb
, sc
->cmnd
, sc
->cmd_len
);
123 if (sc
->cmd_len
< MAX_COMMAND_SIZE
)
124 memset(&hdr
->cdb
[sc
->cmd_len
], 0,
125 MAX_COMMAND_SIZE
- sc
->cmd_len
);
127 ctask
->data_count
= 0;
128 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
129 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
133 * imm_count bytes to be sent right after
136 * unsol_count bytes(as Data-Out) to be sent
137 * without R2T ack right after
140 * r2t_data_count bytes to be sent via R2T ack's
142 * pad_count bytes to be sent as zero-padding
144 ctask
->imm_count
= 0;
145 ctask
->unsol_count
= 0;
146 ctask
->unsol_offset
= 0;
147 ctask
->unsol_datasn
= 0;
149 if (session
->imm_data_en
) {
150 if (sc
->request_bufflen
>= session
->first_burst
)
151 ctask
->imm_count
= min(session
->first_burst
,
152 conn
->max_xmit_dlength
);
154 ctask
->imm_count
= min(sc
->request_bufflen
,
155 conn
->max_xmit_dlength
);
156 hton24(ctask
->hdr
->dlength
, ctask
->imm_count
);
158 zero_data(ctask
->hdr
->dlength
);
160 if (!session
->initial_r2t_en
) {
161 ctask
->unsol_count
= min((session
->first_burst
),
162 (sc
->request_bufflen
)) - ctask
->imm_count
;
163 ctask
->unsol_offset
= ctask
->imm_count
;
166 if (!ctask
->unsol_count
)
167 /* No unsolicit Data-Out's */
168 ctask
->hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
170 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
171 zero_data(hdr
->dlength
);
173 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
174 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
177 conn
->scsicmd_pdus_cnt
++;
179 EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu
);
182 * iscsi_complete_command - return command back to scsi-ml
183 * @ctask: iscsi cmd task
185 * Must be called with session lock.
186 * This function returns the scsi command to scsi-ml and returns
187 * the cmd task to the pool of available cmd tasks.
189 static void iscsi_complete_command(struct iscsi_cmd_task
*ctask
)
191 struct iscsi_session
*session
= ctask
->conn
->session
;
192 struct scsi_cmnd
*sc
= ctask
->sc
;
194 ctask
->state
= ISCSI_TASK_COMPLETED
;
196 /* SCSI eh reuses commands to verify us */
198 list_del_init(&ctask
->running
);
199 __kfifo_put(session
->cmdpool
.queue
, (void*)&ctask
, sizeof(void*));
203 static void __iscsi_get_ctask(struct iscsi_cmd_task
*ctask
)
205 atomic_inc(&ctask
->refcount
);
208 static void iscsi_get_ctask(struct iscsi_cmd_task
*ctask
)
210 spin_lock_bh(&ctask
->conn
->session
->lock
);
211 __iscsi_get_ctask(ctask
);
212 spin_unlock_bh(&ctask
->conn
->session
->lock
);
215 static void __iscsi_put_ctask(struct iscsi_cmd_task
*ctask
)
217 if (atomic_dec_and_test(&ctask
->refcount
))
218 iscsi_complete_command(ctask
);
221 static void iscsi_put_ctask(struct iscsi_cmd_task
*ctask
)
223 spin_lock_bh(&ctask
->conn
->session
->lock
);
224 __iscsi_put_ctask(ctask
);
225 spin_unlock_bh(&ctask
->conn
->session
->lock
);
229 * iscsi_cmd_rsp - SCSI Command Response processing
230 * @conn: iscsi connection
232 * @ctask: scsi command task
233 * @data: cmd data buffer
234 * @datalen: len of buffer
236 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
237 * then completes the command and task.
239 static int iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
240 struct iscsi_cmd_task
*ctask
, char *data
,
244 struct iscsi_cmd_rsp
*rhdr
= (struct iscsi_cmd_rsp
*)hdr
;
245 struct iscsi_session
*session
= conn
->session
;
246 struct scsi_cmnd
*sc
= ctask
->sc
;
248 rc
= iscsi_check_assign_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
250 sc
->result
= DID_ERROR
<< 16;
254 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
256 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
258 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
259 sc
->result
= DID_ERROR
<< 16;
263 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
268 printk(KERN_ERR
"iscsi: Got CHECK_CONDITION but "
269 "invalid data buffer size of %d\n", datalen
);
270 sc
->result
= DID_BAD_TARGET
<< 16;
274 senselen
= be16_to_cpu(get_unaligned((__be16
*) data
));
275 if (datalen
< senselen
)
276 goto invalid_datalen
;
278 memcpy(sc
->sense_buffer
, data
+ 2,
279 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
280 debug_scsi("copied %d bytes of sense\n",
281 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
284 if (sc
->sc_data_direction
== DMA_TO_DEVICE
)
287 if (rhdr
->flags
& ISCSI_FLAG_CMD_UNDERFLOW
) {
288 int res_count
= be32_to_cpu(rhdr
->residual_count
);
290 if (res_count
> 0 && res_count
<= sc
->request_bufflen
)
291 sc
->resid
= res_count
;
293 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
294 } else if (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_UNDERFLOW
)
295 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
296 else if (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
)
297 sc
->resid
= be32_to_cpu(rhdr
->residual_count
);
300 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
301 (long)sc
, sc
->result
, ctask
->itt
);
302 conn
->scsirsp_pdus_cnt
++;
304 __iscsi_put_ctask(ctask
);
308 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
310 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
312 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
313 conn
->tmfrsp_pdus_cnt
++;
315 if (conn
->tmabort_state
!= TMABORT_INITIAL
)
318 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
319 conn
->tmabort_state
= TMABORT_SUCCESS
;
320 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
321 conn
->tmabort_state
= TMABORT_NOT_FOUND
;
323 conn
->tmabort_state
= TMABORT_FAILED
;
324 wake_up(&conn
->ehwait
);
327 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
328 char *data
, int datalen
)
330 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
331 struct iscsi_hdr rejected_pdu
;
334 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
336 if (reject
->reason
== ISCSI_REASON_DATA_DIGEST_ERROR
) {
337 if (ntoh24(reject
->dlength
) > datalen
)
338 return ISCSI_ERR_PROTO
;
340 if (ntoh24(reject
->dlength
) >= sizeof(struct iscsi_hdr
)) {
341 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
342 itt
= get_itt(rejected_pdu
.itt
);
343 printk(KERN_ERR
"itt 0x%x had pdu (op 0x%x) rejected "
344 "due to DataDigest error.\n", itt
,
345 rejected_pdu
.opcode
);
352 * __iscsi_complete_pdu - complete pdu
356 * @datalen: len of data buffer
358 * Completes pdu processing by freeing any resources allocated at
359 * queuecommand or send generic. session lock must be held and verify
360 * itt must have been called.
362 int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
363 char *data
, int datalen
)
365 struct iscsi_session
*session
= conn
->session
;
366 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
367 struct iscsi_cmd_task
*ctask
;
368 struct iscsi_mgmt_task
*mtask
;
371 if (hdr
->itt
!= RESERVED_ITT
)
372 itt
= get_itt(hdr
->itt
);
376 if (itt
< session
->cmds_max
) {
377 ctask
= session
->cmds
[itt
];
379 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
380 opcode
, conn
->id
, ctask
->itt
, datalen
);
383 case ISCSI_OP_SCSI_CMD_RSP
:
384 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
385 rc
= iscsi_scsi_cmd_rsp(conn
, hdr
, ctask
, data
,
388 case ISCSI_OP_SCSI_DATA_IN
:
389 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
390 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
391 conn
->scsirsp_pdus_cnt
++;
392 __iscsi_put_ctask(ctask
);
396 /* LLD handles this for now */
399 rc
= ISCSI_ERR_BAD_OPCODE
;
402 } else if (itt
>= ISCSI_MGMT_ITT_OFFSET
&&
403 itt
< ISCSI_MGMT_ITT_OFFSET
+ session
->mgmtpool_max
) {
404 mtask
= session
->mgmt_cmds
[itt
- ISCSI_MGMT_ITT_OFFSET
];
406 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
407 opcode
, conn
->id
, mtask
->itt
, datalen
);
409 rc
= iscsi_check_assign_cmdsn(session
,
410 (struct iscsi_nopin
*)hdr
);
415 case ISCSI_OP_LOGOUT_RSP
:
417 rc
= ISCSI_ERR_PROTO
;
420 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
422 case ISCSI_OP_LOGIN_RSP
:
423 case ISCSI_OP_TEXT_RSP
:
425 * login related PDU's exp_statsn is handled in
428 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
429 rc
= ISCSI_ERR_CONN_FAILED
;
430 list_del(&mtask
->running
);
431 if (conn
->login_mtask
!= mtask
)
432 __kfifo_put(session
->mgmtpool
.queue
,
433 (void*)&mtask
, sizeof(void*));
435 case ISCSI_OP_SCSI_TMFUNC_RSP
:
437 rc
= ISCSI_ERR_PROTO
;
441 iscsi_tmf_rsp(conn
, hdr
);
443 case ISCSI_OP_NOOP_IN
:
444 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) || datalen
) {
445 rc
= ISCSI_ERR_PROTO
;
448 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
450 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
451 rc
= ISCSI_ERR_CONN_FAILED
;
452 list_del(&mtask
->running
);
453 if (conn
->login_mtask
!= mtask
)
454 __kfifo_put(session
->mgmtpool
.queue
,
455 (void*)&mtask
, sizeof(void*));
458 rc
= ISCSI_ERR_BAD_OPCODE
;
461 } else if (itt
== ~0U) {
462 rc
= iscsi_check_assign_cmdsn(session
,
463 (struct iscsi_nopin
*)hdr
);
468 case ISCSI_OP_NOOP_IN
:
470 rc
= ISCSI_ERR_PROTO
;
474 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
477 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, NULL
, 0))
478 rc
= ISCSI_ERR_CONN_FAILED
;
480 case ISCSI_OP_REJECT
:
481 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
483 case ISCSI_OP_ASYNC_EVENT
:
484 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
485 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
486 rc
= ISCSI_ERR_CONN_FAILED
;
489 rc
= ISCSI_ERR_BAD_OPCODE
;
493 rc
= ISCSI_ERR_BAD_ITT
;
498 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu
);
500 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
501 char *data
, int datalen
)
505 spin_lock(&conn
->session
->lock
);
506 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
507 spin_unlock(&conn
->session
->lock
);
510 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
512 /* verify itt (itt encoding: age+cid+itt) */
513 int iscsi_verify_itt(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
516 struct iscsi_session
*session
= conn
->session
;
517 struct iscsi_cmd_task
*ctask
;
520 if (hdr
->itt
!= RESERVED_ITT
) {
521 if (((__force u32
)hdr
->itt
& ISCSI_AGE_MASK
) !=
522 (session
->age
<< ISCSI_AGE_SHIFT
)) {
523 printk(KERN_ERR
"iscsi: received itt %x expected "
524 "session age (%x)\n", (__force u32
)hdr
->itt
,
525 session
->age
& ISCSI_AGE_MASK
);
526 return ISCSI_ERR_BAD_ITT
;
529 if (((__force u32
)hdr
->itt
& ISCSI_CID_MASK
) !=
530 (conn
->id
<< ISCSI_CID_SHIFT
)) {
531 printk(KERN_ERR
"iscsi: received itt %x, expected "
532 "CID (%x)\n", (__force u32
)hdr
->itt
, conn
->id
);
533 return ISCSI_ERR_BAD_ITT
;
535 itt
= get_itt(hdr
->itt
);
539 if (itt
< session
->cmds_max
) {
540 ctask
= session
->cmds
[itt
];
543 printk(KERN_INFO
"iscsi: dropping ctask with "
544 "itt 0x%x\n", ctask
->itt
);
546 return ISCSI_ERR_NO_SCSI_CMD
;
549 if (ctask
->sc
->SCp
.phase
!= session
->age
) {
550 printk(KERN_ERR
"iscsi: ctask's session age %d, "
551 "expected %d\n", ctask
->sc
->SCp
.phase
,
553 return ISCSI_ERR_SESSION_FAILED
;
560 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
562 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
564 struct iscsi_session
*session
= conn
->session
;
567 spin_lock_irqsave(&session
->lock
, flags
);
568 if (session
->state
== ISCSI_STATE_FAILED
) {
569 spin_unlock_irqrestore(&session
->lock
, flags
);
573 if (conn
->stop_stage
== 0)
574 session
->state
= ISCSI_STATE_FAILED
;
575 spin_unlock_irqrestore(&session
->lock
, flags
);
576 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
577 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
578 iscsi_conn_error(conn
->cls_conn
, err
);
580 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
582 static int iscsi_xmit_mtask(struct iscsi_conn
*conn
)
584 struct iscsi_hdr
*hdr
= conn
->mtask
->hdr
;
585 int rc
, was_logout
= 0;
587 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
) {
588 conn
->session
->state
= ISCSI_STATE_IN_RECOVERY
;
589 iscsi_block_session(session_to_cls(conn
->session
));
592 rc
= conn
->session
->tt
->xmit_mgmt_task(conn
, conn
->mtask
);
596 /* done with this in-progress mtask */
600 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
607 * iscsi_data_xmit - xmit any command into the scheduled connection
608 * @conn: iscsi connection
611 * The function can return -EAGAIN in which case the caller must
612 * re-schedule it again later or recover. '0' return code means
615 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
617 struct iscsi_transport
*tt
;
620 if (unlikely(conn
->suspend_tx
)) {
621 debug_scsi("conn %d Tx suspended!\n", conn
->id
);
624 tt
= conn
->session
->tt
;
627 * Transmit in the following order:
629 * 1) un-finished xmit (ctask or mtask)
630 * 2) immediate control PDUs
633 * 5) non-immediate control PDUs
635 * No need to lock around __kfifo_get as long as
636 * there's one producer and one consumer.
639 BUG_ON(conn
->ctask
&& conn
->mtask
);
642 iscsi_get_ctask(conn
->ctask
);
643 rc
= tt
->xmit_cmd_task(conn
, conn
->ctask
);
644 iscsi_put_ctask(conn
->ctask
);
647 /* done with this in-progress ctask */
651 rc
= iscsi_xmit_mtask(conn
);
656 /* process immediate first */
657 if (unlikely(__kfifo_len(conn
->immqueue
))) {
658 while (__kfifo_get(conn
->immqueue
, (void*)&conn
->mtask
,
660 spin_lock_bh(&conn
->session
->lock
);
661 list_add_tail(&conn
->mtask
->running
,
662 &conn
->mgmt_run_list
);
663 spin_unlock_bh(&conn
->session
->lock
);
664 rc
= iscsi_xmit_mtask(conn
);
670 /* process command queue */
671 spin_lock_bh(&conn
->session
->lock
);
672 while (!list_empty(&conn
->xmitqueue
)) {
674 * iscsi tcp may readd the task to the xmitqueue to send
677 conn
->ctask
= list_entry(conn
->xmitqueue
.next
,
678 struct iscsi_cmd_task
, running
);
679 conn
->ctask
->state
= ISCSI_TASK_RUNNING
;
680 list_move_tail(conn
->xmitqueue
.next
, &conn
->run_list
);
681 __iscsi_get_ctask(conn
->ctask
);
682 spin_unlock_bh(&conn
->session
->lock
);
684 rc
= tt
->xmit_cmd_task(conn
, conn
->ctask
);
686 spin_lock_bh(&conn
->session
->lock
);
687 __iscsi_put_ctask(conn
->ctask
);
689 spin_unlock_bh(&conn
->session
->lock
);
693 spin_unlock_bh(&conn
->session
->lock
);
694 /* done with this ctask */
697 /* process the rest control plane PDUs, if any */
698 if (unlikely(__kfifo_len(conn
->mgmtqueue
))) {
699 while (__kfifo_get(conn
->mgmtqueue
, (void*)&conn
->mtask
,
701 spin_lock_bh(&conn
->session
->lock
);
702 list_add_tail(&conn
->mtask
->running
,
703 &conn
->mgmt_run_list
);
704 spin_unlock_bh(&conn
->session
->lock
);
705 rc
= iscsi_xmit_mtask(conn
);
714 if (unlikely(conn
->suspend_tx
))
720 static void iscsi_xmitworker(struct work_struct
*work
)
722 struct iscsi_conn
*conn
=
723 container_of(work
, struct iscsi_conn
, xmitwork
);
726 * serialize Xmit worker on a per-connection basis.
728 mutex_lock(&conn
->xmitmutex
);
730 rc
= iscsi_data_xmit(conn
);
731 } while (rc
>= 0 || rc
== -EAGAIN
);
732 mutex_unlock(&conn
->xmitmutex
);
736 FAILURE_BAD_HOST
= 1,
737 FAILURE_SESSION_FAILED
,
738 FAILURE_SESSION_FREED
,
739 FAILURE_WINDOW_CLOSED
,
741 FAILURE_SESSION_TERMINATE
,
742 FAILURE_SESSION_IN_RECOVERY
,
743 FAILURE_SESSION_RECOVERY_TIMEOUT
,
746 int iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
748 struct Scsi_Host
*host
;
750 struct iscsi_session
*session
;
751 struct iscsi_conn
*conn
;
752 struct iscsi_cmd_task
*ctask
= NULL
;
754 sc
->scsi_done
= done
;
758 host
= sc
->device
->host
;
759 session
= iscsi_hostdata(host
->hostdata
);
761 spin_lock(&session
->lock
);
764 * ISCSI_STATE_FAILED is a temp. state. The recovery
765 * code will decide what is best to do with command queued
768 if (session
->state
!= ISCSI_STATE_LOGGED_IN
&&
769 session
->state
!= ISCSI_STATE_FAILED
) {
771 * to handle the race between when we set the recovery state
772 * and block the session we requeue here (commands could
773 * be entering our queuecommand while a block is starting
774 * up because the block code is not locked)
776 if (session
->state
== ISCSI_STATE_IN_RECOVERY
) {
777 reason
= FAILURE_SESSION_IN_RECOVERY
;
781 if (session
->state
== ISCSI_STATE_RECOVERY_FAILED
)
782 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
783 else if (session
->state
== ISCSI_STATE_TERMINATE
)
784 reason
= FAILURE_SESSION_TERMINATE
;
786 reason
= FAILURE_SESSION_FREED
;
791 * Check for iSCSI window and take care of CmdSN wrap-around
793 if ((int)(session
->max_cmdsn
- session
->cmdsn
) < 0) {
794 reason
= FAILURE_WINDOW_CLOSED
;
798 conn
= session
->leadconn
;
800 reason
= FAILURE_SESSION_FREED
;
804 if (!__kfifo_get(session
->cmdpool
.queue
, (void*)&ctask
,
806 reason
= FAILURE_OOM
;
809 sc
->SCp
.phase
= session
->age
;
810 sc
->SCp
.ptr
= (char *)ctask
;
812 atomic_set(&ctask
->refcount
, 1);
813 ctask
->state
= ISCSI_TASK_PENDING
;
817 INIT_LIST_HEAD(&ctask
->running
);
818 iscsi_prep_scsi_cmd_pdu(ctask
);
820 session
->tt
->init_cmd_task(ctask
);
822 list_add_tail(&ctask
->running
, &conn
->xmitqueue
);
824 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
826 sc
->sc_data_direction
== DMA_TO_DEVICE
? "write" : "read",
827 conn
->id
, sc
, sc
->cmnd
[0], ctask
->itt
, sc
->request_bufflen
,
828 session
->cmdsn
, session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
829 spin_unlock(&session
->lock
);
831 scsi_queue_work(host
, &conn
->xmitwork
);
835 spin_unlock(&session
->lock
);
836 debug_scsi("cmd 0x%x rejected (%d)\n", sc
->cmnd
[0], reason
);
837 return SCSI_MLQUEUE_HOST_BUSY
;
840 spin_unlock(&session
->lock
);
841 printk(KERN_ERR
"iscsi: cmd 0x%x is not queued (%d)\n",
842 sc
->cmnd
[0], reason
);
843 sc
->result
= (DID_NO_CONNECT
<< 16);
844 sc
->resid
= sc
->request_bufflen
;
848 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
850 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
)
852 if (depth
> ISCSI_MAX_CMD_PER_LUN
)
853 depth
= ISCSI_MAX_CMD_PER_LUN
;
854 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
855 return sdev
->queue_depth
;
857 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
860 iscsi_conn_send_generic(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
861 char *data
, uint32_t data_size
)
863 struct iscsi_session
*session
= conn
->session
;
864 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
865 struct iscsi_mgmt_task
*mtask
;
867 spin_lock_bh(&session
->lock
);
868 if (session
->state
== ISCSI_STATE_TERMINATE
) {
869 spin_unlock_bh(&session
->lock
);
872 if (hdr
->opcode
== (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) ||
873 hdr
->opcode
== (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
875 * Login and Text are sent serially, in
876 * request-followed-by-response sequence.
877 * Same mtask can be used. Same ITT must be used.
878 * Note that login_mtask is preallocated at conn_create().
880 mtask
= conn
->login_mtask
;
882 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
883 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
885 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
886 if (!__kfifo_get(session
->mgmtpool
.queue
,
887 (void*)&mtask
, sizeof(void*))) {
888 spin_unlock_bh(&session
->lock
);
894 * pre-format CmdSN for outgoing PDU.
896 if (hdr
->itt
!= RESERVED_ITT
) {
897 hdr
->itt
= build_itt(mtask
->itt
, conn
->id
, session
->age
);
898 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
899 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
900 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
903 /* do not advance CmdSN */
904 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
907 memcpy(mtask
->data
, data
, data_size
);
908 mtask
->data_count
= data_size
;
910 mtask
->data_count
= 0;
912 INIT_LIST_HEAD(&mtask
->running
);
913 memcpy(mtask
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
914 if (session
->tt
->init_mgmt_task
)
915 session
->tt
->init_mgmt_task(conn
, mtask
, data
, data_size
);
916 spin_unlock_bh(&session
->lock
);
918 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
919 hdr
->opcode
, hdr
->itt
, data_size
);
922 * since send_pdu() could be called at least from two contexts,
923 * we need to serialize __kfifo_put, so we don't have to take
924 * additional lock on fast data-path
926 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
)
927 __kfifo_put(conn
->immqueue
, (void*)&mtask
, sizeof(void*));
929 __kfifo_put(conn
->mgmtqueue
, (void*)&mtask
, sizeof(void*));
931 scsi_queue_work(session
->host
, &conn
->xmitwork
);
935 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
936 char *data
, uint32_t data_size
)
938 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
941 mutex_lock(&conn
->xmitmutex
);
942 rc
= iscsi_conn_send_generic(conn
, hdr
, data
, data_size
);
943 mutex_unlock(&conn
->xmitmutex
);
947 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
949 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
951 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
952 struct iscsi_conn
*conn
= session
->leadconn
;
954 spin_lock_bh(&session
->lock
);
955 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
956 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
958 wake_up(&conn
->ehwait
);
960 spin_unlock_bh(&session
->lock
);
962 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
964 int iscsi_eh_host_reset(struct scsi_cmnd
*sc
)
966 struct Scsi_Host
*host
= sc
->device
->host
;
967 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
968 struct iscsi_conn
*conn
= session
->leadconn
;
969 int fail_session
= 0;
971 spin_lock_bh(&session
->lock
);
972 if (session
->state
== ISCSI_STATE_TERMINATE
) {
974 debug_scsi("failing host reset: session terminated "
975 "[CID %d age %d]\n", conn
->id
, session
->age
);
976 spin_unlock_bh(&session
->lock
);
980 if (sc
->SCp
.phase
== session
->age
) {
981 debug_scsi("failing connection CID %d due to SCSI host reset\n",
985 spin_unlock_bh(&session
->lock
);
988 * we drop the lock here but the leadconn cannot be destoyed while
989 * we are in the scsi eh
992 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
994 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
995 wait_event_interruptible(conn
->ehwait
,
996 session
->state
== ISCSI_STATE_TERMINATE
||
997 session
->state
== ISCSI_STATE_LOGGED_IN
||
998 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
999 if (signal_pending(current
))
1000 flush_signals(current
);
1002 spin_lock_bh(&session
->lock
);
1003 if (session
->state
== ISCSI_STATE_LOGGED_IN
)
1004 printk(KERN_INFO
"iscsi: host reset succeeded\n");
1007 spin_unlock_bh(&session
->lock
);
1011 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset
);
1013 static void iscsi_tmabort_timedout(unsigned long data
)
1015 struct iscsi_cmd_task
*ctask
= (struct iscsi_cmd_task
*)data
;
1016 struct iscsi_conn
*conn
= ctask
->conn
;
1017 struct iscsi_session
*session
= conn
->session
;
1019 spin_lock(&session
->lock
);
1020 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
1021 conn
->tmabort_state
= TMABORT_TIMEDOUT
;
1022 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1023 ctask
->sc
, ctask
->itt
);
1024 /* unblock eh_abort() */
1025 wake_up(&conn
->ehwait
);
1027 spin_unlock(&session
->lock
);
1030 /* must be called with the mutex 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
;
1040 * ctask timed out but session is OK requests must be serialized.
1042 memset(hdr
, 0, sizeof(struct iscsi_tm
));
1043 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1044 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
;
1045 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1046 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
1047 hdr
->rtt
= ctask
->hdr
->itt
;
1048 hdr
->refcmdsn
= ctask
->hdr
->cmdsn
;
1050 rc
= iscsi_conn_send_generic(conn
, (struct iscsi_hdr
*)hdr
,
1053 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1054 debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask
->itt
,
1059 debug_scsi("abort sent [itt 0x%x]\n", ctask
->itt
);
1061 spin_lock_bh(&session
->lock
);
1062 ctask
->mtask
= (struct iscsi_mgmt_task
*)
1063 session
->mgmt_cmds
[get_itt(hdr
->itt
) -
1064 ISCSI_MGMT_ITT_OFFSET
];
1066 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
1067 conn
->tmfcmd_pdus_cnt
++;
1068 conn
->tmabort_timer
.expires
= 10*HZ
+ jiffies
;
1069 conn
->tmabort_timer
.function
= iscsi_tmabort_timedout
;
1070 conn
->tmabort_timer
.data
= (unsigned long)ctask
;
1071 add_timer(&conn
->tmabort_timer
);
1072 debug_scsi("abort set timeout [itt 0x%x]\n", ctask
->itt
);
1074 spin_unlock_bh(&session
->lock
);
1075 mutex_unlock(&conn
->xmitmutex
);
1078 * block eh thread until:
1082 * 3) session is terminated or restarted or userspace has
1083 * given up on recovery
1085 wait_event_interruptible(conn
->ehwait
,
1086 sc
->SCp
.phase
!= session
->age
||
1087 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1088 conn
->tmabort_state
!= TMABORT_INITIAL
);
1089 if (signal_pending(current
))
1090 flush_signals(current
);
1091 del_timer_sync(&conn
->tmabort_timer
);
1093 mutex_lock(&conn
->xmitmutex
);
1098 * xmit mutex and session lock must be held
1100 static struct iscsi_mgmt_task
*
1101 iscsi_remove_mgmt_task(struct kfifo
*fifo
, uint32_t itt
)
1103 int i
, nr_tasks
= __kfifo_len(fifo
) / sizeof(void*);
1104 struct iscsi_mgmt_task
*task
;
1106 debug_scsi("searching %d tasks\n", nr_tasks
);
1108 for (i
= 0; i
< nr_tasks
; i
++) {
1109 __kfifo_get(fifo
, (void*)&task
, sizeof(void*));
1110 debug_scsi("check task %u\n", task
->itt
);
1112 if (task
->itt
== itt
) {
1113 debug_scsi("matched task\n");
1117 __kfifo_put(fifo
, (void*)&task
, sizeof(void*));
1122 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task
*ctask
)
1124 struct iscsi_conn
*conn
= ctask
->conn
;
1125 struct iscsi_session
*session
= conn
->session
;
1130 if (!iscsi_remove_mgmt_task(conn
->immqueue
, ctask
->mtask
->itt
))
1131 list_del(&ctask
->mtask
->running
);
1132 __kfifo_put(session
->mgmtpool
.queue
, (void*)&ctask
->mtask
,
1134 ctask
->mtask
= NULL
;
1139 * session lock and xmitmutex must be held
1141 static void fail_command(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1144 struct scsi_cmnd
*sc
;
1150 conn
->session
->tt
->cleanup_cmd_task(conn
, ctask
);
1151 iscsi_ctask_mtask_cleanup(ctask
);
1154 sc
->resid
= sc
->request_bufflen
;
1155 /* release ref from queuecommand */
1156 __iscsi_put_ctask(ctask
);
1159 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
1161 struct iscsi_cmd_task
*ctask
;
1162 struct iscsi_conn
*conn
;
1163 struct iscsi_session
*session
;
1167 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1171 debug_scsi("sc never reached iscsi layer or it completed.\n");
1175 ctask
= (struct iscsi_cmd_task
*)sc
->SCp
.ptr
;
1177 session
= conn
->session
;
1179 conn
->eh_abort_cnt
++;
1180 debug_scsi("aborting [sc %p itt 0x%x]\n", sc
, ctask
->itt
);
1182 mutex_lock(&conn
->xmitmutex
);
1183 spin_lock_bh(&session
->lock
);
1186 * If we are not logged in or we have started a new session
1187 * then let the host reset code handle this
1189 if (session
->state
!= ISCSI_STATE_LOGGED_IN
||
1190 sc
->SCp
.phase
!= session
->age
)
1193 /* ctask completed before time out */
1195 spin_unlock_bh(&session
->lock
);
1196 debug_scsi("sc completed while abort in progress\n");
1197 goto success_rel_mutex
;
1200 /* what should we do here ? */
1201 if (conn
->ctask
== ctask
) {
1202 printk(KERN_INFO
"iscsi: sc %p itt 0x%x partially sent. "
1203 "Failing abort\n", sc
, ctask
->itt
);
1207 if (ctask
->state
== ISCSI_TASK_PENDING
)
1208 goto success_cleanup
;
1210 conn
->tmabort_state
= TMABORT_INITIAL
;
1212 spin_unlock_bh(&session
->lock
);
1213 rc
= iscsi_exec_abort_task(sc
, ctask
);
1214 spin_lock_bh(&session
->lock
);
1216 if (rc
|| sc
->SCp
.phase
!= session
->age
||
1217 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1219 iscsi_ctask_mtask_cleanup(ctask
);
1221 switch (conn
->tmabort_state
) {
1222 case TMABORT_SUCCESS
:
1223 goto success_cleanup
;
1224 case TMABORT_NOT_FOUND
:
1226 /* ctask completed before tmf abort response */
1227 spin_unlock_bh(&session
->lock
);
1228 debug_scsi("sc completed while abort in progress\n");
1229 goto success_rel_mutex
;
1233 /* timedout or failed */
1234 spin_unlock_bh(&session
->lock
);
1235 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1236 spin_lock_bh(&session
->lock
);
1241 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1242 spin_unlock_bh(&session
->lock
);
1245 * clean up task if aborted. we have the xmitmutex so grab
1246 * the recv lock as a writer
1248 write_lock_bh(conn
->recv_lock
);
1249 spin_lock(&session
->lock
);
1250 fail_command(conn
, ctask
, DID_ABORT
<< 16);
1251 spin_unlock(&session
->lock
);
1252 write_unlock_bh(conn
->recv_lock
);
1255 mutex_unlock(&conn
->xmitmutex
);
1259 spin_unlock_bh(&session
->lock
);
1260 mutex_unlock(&conn
->xmitmutex
);
1262 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1265 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
1268 iscsi_pool_init(struct iscsi_queue
*q
, int max
, void ***items
, int item_size
)
1272 *items
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
1277 q
->pool
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
1278 if (q
->pool
== NULL
) {
1283 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
1285 if (q
->queue
== ERR_PTR(-ENOMEM
)) {
1291 for (i
= 0; i
< max
; i
++) {
1292 q
->pool
[i
] = kmalloc(item_size
, GFP_KERNEL
);
1293 if (q
->pool
[i
] == NULL
) {
1296 for (j
= 0; j
< i
; j
++)
1299 kfifo_free(q
->queue
);
1304 memset(q
->pool
[i
], 0, item_size
);
1305 (*items
)[i
] = q
->pool
[i
];
1306 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
1310 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
1312 void iscsi_pool_free(struct iscsi_queue
*q
, void **items
)
1316 for (i
= 0; i
< q
->max
; i
++)
1321 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
1324 * iSCSI Session's hostdata organization:
1326 * *------------------* <== hostdata_session(host->hostdata)
1327 * | ptr to class sess|
1328 * |------------------| <== iscsi_hostdata(host->hostdata)
1330 * *------------------*
1333 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1334 _sz % sizeof(unsigned long))
1336 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1339 * iscsi_session_setup - create iscsi cls session and host and session
1340 * @scsit: scsi transport template
1341 * @iscsit: iscsi transport template
1342 * @initial_cmdsn: initial CmdSN
1343 * @hostno: host no allocated
1345 * This can be used by software iscsi_transports that allocate
1346 * a session per scsi host.
1348 struct iscsi_cls_session
*
1349 iscsi_session_setup(struct iscsi_transport
*iscsit
,
1350 struct scsi_transport_template
*scsit
,
1351 int cmd_task_size
, int mgmt_task_size
,
1352 uint32_t initial_cmdsn
, uint32_t *hostno
)
1354 struct Scsi_Host
*shost
;
1355 struct iscsi_session
*session
;
1356 struct iscsi_cls_session
*cls_session
;
1359 shost
= scsi_host_alloc(iscsit
->host_template
,
1360 hostdata_privsize(sizeof(*session
)));
1365 shost
->max_channel
= 0;
1366 shost
->max_lun
= iscsit
->max_lun
;
1367 shost
->max_cmd_len
= iscsit
->max_cmd_len
;
1368 shost
->transportt
= scsit
;
1369 shost
->transportt
->create_work_queue
= 1;
1370 *hostno
= shost
->host_no
;
1372 session
= iscsi_hostdata(shost
->hostdata
);
1373 memset(session
, 0, sizeof(struct iscsi_session
));
1374 session
->host
= shost
;
1375 session
->state
= ISCSI_STATE_FREE
;
1376 session
->mgmtpool_max
= ISCSI_MGMT_CMDS_MAX
;
1377 session
->cmds_max
= ISCSI_XMIT_CMDS_MAX
;
1378 session
->cmdsn
= initial_cmdsn
;
1379 session
->exp_cmdsn
= initial_cmdsn
+ 1;
1380 session
->max_cmdsn
= initial_cmdsn
+ 1;
1381 session
->max_r2t
= 1;
1382 session
->tt
= iscsit
;
1384 /* initialize SCSI PDU commands pool */
1385 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
1386 (void***)&session
->cmds
,
1387 cmd_task_size
+ sizeof(struct iscsi_cmd_task
)))
1388 goto cmdpool_alloc_fail
;
1390 /* pre-format cmds pool with ITT */
1391 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
1392 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
1395 ctask
->dd_data
= &ctask
[1];
1397 INIT_LIST_HEAD(&ctask
->running
);
1400 spin_lock_init(&session
->lock
);
1402 /* initialize immediate command pool */
1403 if (iscsi_pool_init(&session
->mgmtpool
, session
->mgmtpool_max
,
1404 (void***)&session
->mgmt_cmds
,
1405 mgmt_task_size
+ sizeof(struct iscsi_mgmt_task
)))
1406 goto mgmtpool_alloc_fail
;
1409 /* pre-format immediate cmds pool with ITT */
1410 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++) {
1411 struct iscsi_mgmt_task
*mtask
= session
->mgmt_cmds
[cmd_i
];
1414 mtask
->dd_data
= &mtask
[1];
1415 mtask
->itt
= ISCSI_MGMT_ITT_OFFSET
+ cmd_i
;
1416 INIT_LIST_HEAD(&mtask
->running
);
1419 if (scsi_add_host(shost
, NULL
))
1422 if (!try_module_get(iscsit
->owner
))
1423 goto cls_session_fail
;
1425 cls_session
= iscsi_create_session(shost
, iscsit
, 0);
1428 *(unsigned long*)shost
->hostdata
= (unsigned long)cls_session
;
1433 module_put(iscsit
->owner
);
1435 scsi_remove_host(shost
);
1437 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
1438 mgmtpool_alloc_fail
:
1439 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
1441 scsi_host_put(shost
);
1444 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
1447 * iscsi_session_teardown - destroy session, host, and cls_session
1450 * This can be used by software iscsi_transports that allocate
1451 * a session per scsi host.
1453 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
1455 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1456 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1457 struct module
*owner
= cls_session
->transport
->owner
;
1459 scsi_remove_host(shost
);
1461 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
1462 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
1464 kfree(session
->targetname
);
1465 kfree(session
->hwaddress
);
1466 kfree(session
->initiatorname
);
1468 iscsi_destroy_session(cls_session
);
1469 scsi_host_put(shost
);
1472 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
1475 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1476 * @cls_session: iscsi_cls_session
1479 struct iscsi_cls_conn
*
1480 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, uint32_t conn_idx
)
1482 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1483 struct iscsi_conn
*conn
;
1484 struct iscsi_cls_conn
*cls_conn
;
1487 cls_conn
= iscsi_create_conn(cls_session
, conn_idx
);
1490 conn
= cls_conn
->dd_data
;
1491 memset(conn
, 0, sizeof(*conn
));
1493 conn
->session
= session
;
1494 conn
->cls_conn
= cls_conn
;
1495 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
1496 conn
->id
= conn_idx
;
1497 conn
->exp_statsn
= 0;
1498 conn
->tmabort_state
= TMABORT_INITIAL
;
1499 INIT_LIST_HEAD(&conn
->run_list
);
1500 INIT_LIST_HEAD(&conn
->mgmt_run_list
);
1501 INIT_LIST_HEAD(&conn
->xmitqueue
);
1503 /* initialize general immediate & non-immediate PDU commands queue */
1504 conn
->immqueue
= kfifo_alloc(session
->mgmtpool_max
* sizeof(void*),
1506 if (conn
->immqueue
== ERR_PTR(-ENOMEM
))
1507 goto immqueue_alloc_fail
;
1509 conn
->mgmtqueue
= kfifo_alloc(session
->mgmtpool_max
* sizeof(void*),
1511 if (conn
->mgmtqueue
== ERR_PTR(-ENOMEM
))
1512 goto mgmtqueue_alloc_fail
;
1514 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
1516 /* allocate login_mtask used for the login/text sequences */
1517 spin_lock_bh(&session
->lock
);
1518 if (!__kfifo_get(session
->mgmtpool
.queue
,
1519 (void*)&conn
->login_mtask
,
1521 spin_unlock_bh(&session
->lock
);
1522 goto login_mtask_alloc_fail
;
1524 spin_unlock_bh(&session
->lock
);
1526 data
= kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN
, GFP_KERNEL
);
1528 goto login_mtask_data_alloc_fail
;
1529 conn
->login_mtask
->data
= conn
->data
= data
;
1531 init_timer(&conn
->tmabort_timer
);
1532 mutex_init(&conn
->xmitmutex
);
1533 init_waitqueue_head(&conn
->ehwait
);
1537 login_mtask_data_alloc_fail
:
1538 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1540 login_mtask_alloc_fail
:
1541 kfifo_free(conn
->mgmtqueue
);
1542 mgmtqueue_alloc_fail
:
1543 kfifo_free(conn
->immqueue
);
1544 immqueue_alloc_fail
:
1545 iscsi_destroy_conn(cls_conn
);
1548 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
1551 * iscsi_conn_teardown - teardown iscsi connection
1552 * cls_conn: iscsi class connection
1554 * TODO: we may need to make this into a two step process
1555 * like scsi-mls remove + put host
1557 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
1559 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1560 struct iscsi_session
*session
= conn
->session
;
1561 unsigned long flags
;
1563 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1564 mutex_lock(&conn
->xmitmutex
);
1566 spin_lock_bh(&session
->lock
);
1567 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
1568 if (session
->leadconn
== conn
) {
1570 * leading connection? then give up on recovery.
1572 session
->state
= ISCSI_STATE_TERMINATE
;
1573 wake_up(&conn
->ehwait
);
1575 spin_unlock_bh(&session
->lock
);
1577 mutex_unlock(&conn
->xmitmutex
);
1580 * Block until all in-progress commands for this connection
1584 spin_lock_irqsave(session
->host
->host_lock
, flags
);
1585 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
1586 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1589 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1590 msleep_interruptible(500);
1591 printk(KERN_INFO
"iscsi: scsi conn_destroy(): host_busy %d "
1592 "host_failed %d\n", session
->host
->host_busy
,
1593 session
->host
->host_failed
);
1595 * force eh_abort() to unblock
1597 wake_up(&conn
->ehwait
);
1600 /* flush queued up work because we free the connection below */
1601 scsi_flush_work(session
->host
);
1603 spin_lock_bh(&session
->lock
);
1605 kfree(conn
->persistent_address
);
1606 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1608 if (session
->leadconn
== conn
) {
1609 session
->leadconn
= NULL
;
1610 /* no connections exits.. reset sequencing */
1611 session
->cmdsn
= session
->max_cmdsn
= session
->exp_cmdsn
= 1;
1613 spin_unlock_bh(&session
->lock
);
1615 kfifo_free(conn
->immqueue
);
1616 kfifo_free(conn
->mgmtqueue
);
1618 iscsi_destroy_conn(cls_conn
);
1620 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
1622 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
1624 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1625 struct iscsi_session
*session
= conn
->session
;
1628 printk(KERN_ERR
"iscsi: can't start unbound connection\n");
1632 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
1633 session
->first_burst
> session
->max_burst
) {
1634 printk("iscsi: invalid burst lengths: "
1635 "first_burst %d max_burst %d\n",
1636 session
->first_burst
, session
->max_burst
);
1640 spin_lock_bh(&session
->lock
);
1641 conn
->c_stage
= ISCSI_CONN_STARTED
;
1642 session
->state
= ISCSI_STATE_LOGGED_IN
;
1644 switch(conn
->stop_stage
) {
1645 case STOP_CONN_RECOVER
:
1647 * unblock eh_abort() if it is blocked. re-try all
1648 * commands after successful recovery
1650 conn
->stop_stage
= 0;
1651 conn
->tmabort_state
= TMABORT_INITIAL
;
1653 spin_unlock_bh(&session
->lock
);
1655 iscsi_unblock_session(session_to_cls(session
));
1656 wake_up(&conn
->ehwait
);
1658 case STOP_CONN_TERM
:
1659 conn
->stop_stage
= 0;
1664 spin_unlock_bh(&session
->lock
);
1668 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
1671 flush_control_queues(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
1673 struct iscsi_mgmt_task
*mtask
, *tmp
;
1675 /* handle pending */
1676 while (__kfifo_get(conn
->immqueue
, (void*)&mtask
, sizeof(void*)) ||
1677 __kfifo_get(conn
->mgmtqueue
, (void*)&mtask
, sizeof(void*))) {
1678 if (mtask
== conn
->login_mtask
)
1680 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask
->itt
);
1681 __kfifo_put(session
->mgmtpool
.queue
, (void*)&mtask
,
1685 /* handle running */
1686 list_for_each_entry_safe(mtask
, tmp
, &conn
->mgmt_run_list
, running
) {
1687 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask
->itt
);
1688 list_del(&mtask
->running
);
1690 if (mtask
== conn
->login_mtask
)
1692 __kfifo_put(session
->mgmtpool
.queue
, (void*)&mtask
,
1699 /* Fail commands. Mutex and session lock held and recv side suspended */
1700 static void fail_all_commands(struct iscsi_conn
*conn
)
1702 struct iscsi_cmd_task
*ctask
, *tmp
;
1705 list_for_each_entry_safe(ctask
, tmp
, &conn
->xmitqueue
, running
) {
1706 debug_scsi("failing pending sc %p itt 0x%x\n", ctask
->sc
,
1708 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1711 /* fail all other running */
1712 list_for_each_entry_safe(ctask
, tmp
, &conn
->run_list
, running
) {
1713 debug_scsi("failing in progress sc %p itt 0x%x\n",
1714 ctask
->sc
, ctask
->itt
);
1715 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1721 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
1722 struct iscsi_conn
*conn
, int flag
)
1726 spin_lock_bh(&session
->lock
);
1727 if (conn
->stop_stage
== STOP_CONN_TERM
) {
1728 spin_unlock_bh(&session
->lock
);
1733 * When this is called for the in_login state, we only want to clean
1734 * up the login task and connection. We do not need to block and set
1735 * the recovery state again
1737 if (flag
== STOP_CONN_TERM
)
1738 session
->state
= ISCSI_STATE_TERMINATE
;
1739 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
1740 session
->state
= ISCSI_STATE_IN_RECOVERY
;
1742 old_stop_stage
= conn
->stop_stage
;
1743 conn
->stop_stage
= flag
;
1744 conn
->c_stage
= ISCSI_CONN_STOPPED
;
1745 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1746 spin_unlock_bh(&session
->lock
);
1748 write_lock_bh(conn
->recv_lock
);
1749 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1750 write_unlock_bh(conn
->recv_lock
);
1752 mutex_lock(&conn
->xmitmutex
);
1754 * for connection level recovery we should not calculate
1755 * header digest. conn->hdr_size used for optimization
1756 * in hdr_extract() and will be re-negotiated at
1759 if (flag
== STOP_CONN_RECOVER
) {
1760 conn
->hdrdgst_en
= 0;
1761 conn
->datadgst_en
= 0;
1762 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
1763 old_stop_stage
!= STOP_CONN_RECOVER
) {
1764 debug_scsi("blocking session\n");
1765 iscsi_block_session(session_to_cls(session
));
1772 spin_lock_bh(&session
->lock
);
1773 fail_all_commands(conn
);
1774 flush_control_queues(session
, conn
);
1775 spin_unlock_bh(&session
->lock
);
1777 mutex_unlock(&conn
->xmitmutex
);
1780 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
1782 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1783 struct iscsi_session
*session
= conn
->session
;
1786 case STOP_CONN_RECOVER
:
1787 case STOP_CONN_TERM
:
1788 iscsi_start_session_recovery(session
, conn
, flag
);
1791 printk(KERN_ERR
"iscsi: invalid stop flag %d\n", flag
);
1794 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
1796 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
1797 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
1799 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1800 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1802 spin_lock_bh(&session
->lock
);
1804 session
->leadconn
= conn
;
1805 spin_unlock_bh(&session
->lock
);
1808 * Unblock xmitworker(), Login Phase will pass through.
1810 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1811 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1814 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
1817 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
1818 enum iscsi_param param
, char *buf
, int buflen
)
1820 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1821 struct iscsi_session
*session
= conn
->session
;
1825 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
1826 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
1828 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
1829 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
1831 case ISCSI_PARAM_HDRDGST_EN
:
1832 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
1834 case ISCSI_PARAM_DATADGST_EN
:
1835 sscanf(buf
, "%d", &conn
->datadgst_en
);
1837 case ISCSI_PARAM_INITIAL_R2T_EN
:
1838 sscanf(buf
, "%d", &session
->initial_r2t_en
);
1840 case ISCSI_PARAM_MAX_R2T
:
1841 sscanf(buf
, "%d", &session
->max_r2t
);
1843 case ISCSI_PARAM_IMM_DATA_EN
:
1844 sscanf(buf
, "%d", &session
->imm_data_en
);
1846 case ISCSI_PARAM_FIRST_BURST
:
1847 sscanf(buf
, "%d", &session
->first_burst
);
1849 case ISCSI_PARAM_MAX_BURST
:
1850 sscanf(buf
, "%d", &session
->max_burst
);
1852 case ISCSI_PARAM_PDU_INORDER_EN
:
1853 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
1855 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
1856 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
1858 case ISCSI_PARAM_ERL
:
1859 sscanf(buf
, "%d", &session
->erl
);
1861 case ISCSI_PARAM_IFMARKER_EN
:
1862 sscanf(buf
, "%d", &value
);
1865 case ISCSI_PARAM_OFMARKER_EN
:
1866 sscanf(buf
, "%d", &value
);
1869 case ISCSI_PARAM_EXP_STATSN
:
1870 sscanf(buf
, "%u", &conn
->exp_statsn
);
1872 case ISCSI_PARAM_TARGET_NAME
:
1873 /* this should not change between logins */
1874 if (session
->targetname
)
1877 session
->targetname
= kstrdup(buf
, GFP_KERNEL
);
1878 if (!session
->targetname
)
1881 case ISCSI_PARAM_TPGT
:
1882 sscanf(buf
, "%d", &session
->tpgt
);
1884 case ISCSI_PARAM_PERSISTENT_PORT
:
1885 sscanf(buf
, "%d", &conn
->persistent_port
);
1887 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
1889 * this is the address returned in discovery so it should
1890 * not change between logins.
1892 if (conn
->persistent_address
)
1895 conn
->persistent_address
= kstrdup(buf
, GFP_KERNEL
);
1896 if (!conn
->persistent_address
)
1905 EXPORT_SYMBOL_GPL(iscsi_set_param
);
1907 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
1908 enum iscsi_param param
, char *buf
)
1910 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1911 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1915 case ISCSI_PARAM_INITIAL_R2T_EN
:
1916 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
1918 case ISCSI_PARAM_MAX_R2T
:
1919 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
1921 case ISCSI_PARAM_IMM_DATA_EN
:
1922 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
1924 case ISCSI_PARAM_FIRST_BURST
:
1925 len
= sprintf(buf
, "%u\n", session
->first_burst
);
1927 case ISCSI_PARAM_MAX_BURST
:
1928 len
= sprintf(buf
, "%u\n", session
->max_burst
);
1930 case ISCSI_PARAM_PDU_INORDER_EN
:
1931 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
1933 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
1934 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
1936 case ISCSI_PARAM_ERL
:
1937 len
= sprintf(buf
, "%d\n", session
->erl
);
1939 case ISCSI_PARAM_TARGET_NAME
:
1940 len
= sprintf(buf
, "%s\n", session
->targetname
);
1942 case ISCSI_PARAM_TPGT
:
1943 len
= sprintf(buf
, "%d\n", session
->tpgt
);
1951 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
1953 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
1954 enum iscsi_param param
, char *buf
)
1956 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1960 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
1961 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
1963 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
1964 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
1966 case ISCSI_PARAM_HDRDGST_EN
:
1967 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
1969 case ISCSI_PARAM_DATADGST_EN
:
1970 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
1972 case ISCSI_PARAM_IFMARKER_EN
:
1973 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
1975 case ISCSI_PARAM_OFMARKER_EN
:
1976 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
1978 case ISCSI_PARAM_EXP_STATSN
:
1979 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
1981 case ISCSI_PARAM_PERSISTENT_PORT
:
1982 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
1984 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
1985 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
1993 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
1995 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
1998 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2002 case ISCSI_HOST_PARAM_HWADDRESS
:
2003 if (!session
->hwaddress
)
2004 len
= sprintf(buf
, "%s\n", "default");
2006 len
= sprintf(buf
, "%s\n", session
->hwaddress
);
2008 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2009 if (!session
->initiatorname
)
2010 len
= sprintf(buf
, "%s\n", "unknown");
2012 len
= sprintf(buf
, "%s\n", session
->initiatorname
);
2021 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
2023 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2024 char *buf
, int buflen
)
2026 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2029 case ISCSI_HOST_PARAM_HWADDRESS
:
2030 if (!session
->hwaddress
)
2031 session
->hwaddress
= kstrdup(buf
, GFP_KERNEL
);
2033 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2034 if (!session
->initiatorname
)
2035 session
->initiatorname
= kstrdup(buf
, GFP_KERNEL
);
2043 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
2045 MODULE_AUTHOR("Mike Christie");
2046 MODULE_DESCRIPTION("iSCSI library functions");
2047 MODULE_LICENSE("GPL");