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>
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 #define INVALID_SN_DELTA 0xffff
51 iscsi_check_assign_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
53 uint32_t max_cmdsn
= be32_to_cpu(hdr
->max_cmdsn
);
54 uint32_t exp_cmdsn
= be32_to_cpu(hdr
->exp_cmdsn
);
56 if (max_cmdsn
< exp_cmdsn
-1 &&
57 max_cmdsn
> exp_cmdsn
- INVALID_SN_DELTA
)
58 return ISCSI_ERR_MAX_CMDSN
;
59 if (max_cmdsn
> session
->max_cmdsn
||
60 max_cmdsn
< session
->max_cmdsn
- INVALID_SN_DELTA
)
61 session
->max_cmdsn
= max_cmdsn
;
62 if (exp_cmdsn
> session
->exp_cmdsn
||
63 exp_cmdsn
< session
->exp_cmdsn
- INVALID_SN_DELTA
)
64 session
->exp_cmdsn
= exp_cmdsn
;
68 EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn
);
70 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task
*ctask
,
71 struct iscsi_data
*hdr
)
73 struct iscsi_conn
*conn
= ctask
->conn
;
75 memset(hdr
, 0, sizeof(struct iscsi_data
));
76 hdr
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
77 hdr
->datasn
= cpu_to_be32(ctask
->unsol_datasn
);
78 ctask
->unsol_datasn
++;
79 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
80 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
82 hdr
->itt
= ctask
->hdr
->itt
;
83 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
84 hdr
->offset
= cpu_to_be32(ctask
->unsol_offset
);
86 if (ctask
->unsol_count
> conn
->max_xmit_dlength
) {
87 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
88 ctask
->data_count
= conn
->max_xmit_dlength
;
89 ctask
->unsol_offset
+= ctask
->data_count
;
92 hton24(hdr
->dlength
, ctask
->unsol_count
);
93 ctask
->data_count
= ctask
->unsol_count
;
94 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
97 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu
);
100 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
101 * @ctask: iscsi cmd task
103 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
104 * fields like dlength or final based on how much data it sends
106 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task
*ctask
)
108 struct iscsi_conn
*conn
= ctask
->conn
;
109 struct iscsi_session
*session
= conn
->session
;
110 struct iscsi_cmd
*hdr
= ctask
->hdr
;
111 struct scsi_cmnd
*sc
= ctask
->sc
;
113 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
114 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
115 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
116 hdr
->itt
= ctask
->itt
| (conn
->id
<< ISCSI_CID_SHIFT
) |
117 (session
->age
<< ISCSI_AGE_SHIFT
);
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 memset(&hdr
->cdb
[sc
->cmd_len
], 0, MAX_COMMAND_SIZE
- sc
->cmd_len
);
125 ctask
->data_count
= 0;
126 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
127 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
131 * imm_count bytes to be sent right after
134 * unsol_count bytes(as Data-Out) to be sent
135 * without R2T ack right after
138 * r2t_data_count bytes to be sent via R2T ack's
140 * pad_count bytes to be sent as zero-padding
142 ctask
->imm_count
= 0;
143 ctask
->unsol_count
= 0;
144 ctask
->unsol_offset
= 0;
145 ctask
->unsol_datasn
= 0;
147 if (session
->imm_data_en
) {
148 if (ctask
->total_length
>= session
->first_burst
)
149 ctask
->imm_count
= min(session
->first_burst
,
150 conn
->max_xmit_dlength
);
152 ctask
->imm_count
= min(ctask
->total_length
,
153 conn
->max_xmit_dlength
);
154 hton24(ctask
->hdr
->dlength
, ctask
->imm_count
);
156 zero_data(ctask
->hdr
->dlength
);
158 if (!session
->initial_r2t_en
) {
159 ctask
->unsol_count
= min(session
->first_burst
,
160 ctask
->total_length
) - ctask
->imm_count
;
161 ctask
->unsol_offset
= ctask
->imm_count
;
164 if (!ctask
->unsol_count
)
165 /* No unsolicit Data-Out's */
166 ctask
->hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
169 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
170 zero_data(hdr
->dlength
);
172 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
173 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
176 conn
->scsicmd_pdus_cnt
++;
178 EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu
);
181 * iscsi_complete_command - return command back to scsi-ml
182 * @session: iscsi session
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_session
*session
,
190 struct iscsi_cmd_task
*ctask
)
192 struct scsi_cmnd
*sc
= ctask
->sc
;
194 ctask
->state
= ISCSI_TASK_COMPLETED
;
196 list_del_init(&ctask
->running
);
197 __kfifo_put(session
->cmdpool
.queue
, (void*)&ctask
, sizeof(void*));
202 * iscsi_cmd_rsp - SCSI Command Response processing
203 * @conn: iscsi connection
205 * @ctask: scsi command task
206 * @data: cmd data buffer
207 * @datalen: len of buffer
209 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
210 * then completes the command and task.
212 static int iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
213 struct iscsi_cmd_task
*ctask
, char *data
,
217 struct iscsi_cmd_rsp
*rhdr
= (struct iscsi_cmd_rsp
*)hdr
;
218 struct iscsi_session
*session
= conn
->session
;
219 struct scsi_cmnd
*sc
= ctask
->sc
;
221 rc
= iscsi_check_assign_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
223 sc
->result
= DID_ERROR
<< 16;
227 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
229 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
231 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
232 sc
->result
= DID_ERROR
<< 16;
236 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
241 printk(KERN_ERR
"iscsi: Got CHECK_CONDITION but "
242 "invalid data buffer size of %d\n", datalen
);
243 sc
->result
= DID_BAD_TARGET
<< 16;
247 senselen
= (data
[0] << 8) | data
[1];
248 if (datalen
< senselen
)
249 goto invalid_datalen
;
251 memcpy(sc
->sense_buffer
, data
+ 2,
252 min(senselen
, SCSI_SENSE_BUFFERSIZE
));
253 debug_scsi("copied %d bytes of sense\n",
254 min(senselen
, SCSI_SENSE_BUFFERSIZE
));
257 if (sc
->sc_data_direction
== DMA_TO_DEVICE
)
260 if (rhdr
->flags
& ISCSI_FLAG_CMD_UNDERFLOW
) {
261 int res_count
= be32_to_cpu(rhdr
->residual_count
);
263 if (res_count
> 0 && res_count
<= sc
->request_bufflen
)
264 sc
->resid
= res_count
;
266 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
267 } else if (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_UNDERFLOW
)
268 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
269 else if (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
)
270 sc
->resid
= be32_to_cpu(rhdr
->residual_count
);
273 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
274 (long)sc
, sc
->result
, ctask
->itt
);
275 conn
->scsirsp_pdus_cnt
++;
277 iscsi_complete_command(conn
->session
, ctask
);
281 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
283 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
285 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
286 conn
->tmfrsp_pdus_cnt
++;
288 if (conn
->tmabort_state
!= TMABORT_INITIAL
)
291 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
292 conn
->tmabort_state
= TMABORT_SUCCESS
;
293 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
294 conn
->tmabort_state
= TMABORT_NOT_FOUND
;
296 conn
->tmabort_state
= TMABORT_FAILED
;
297 wake_up(&conn
->ehwait
);
301 * __iscsi_complete_pdu - complete pdu
305 * @datalen: len of data buffer
307 * Completes pdu processing by freeing any resources allocated at
308 * queuecommand or send generic. session lock must be held and verify
309 * itt must have been called.
311 int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
312 char *data
, int datalen
)
314 struct iscsi_session
*session
= conn
->session
;
315 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
316 struct iscsi_cmd_task
*ctask
;
317 struct iscsi_mgmt_task
*mtask
;
320 if (hdr
->itt
!= cpu_to_be32(ISCSI_RESERVED_TAG
))
321 itt
= hdr
->itt
& ISCSI_ITT_MASK
;
325 if (itt
< session
->cmds_max
) {
326 ctask
= session
->cmds
[itt
];
328 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
329 opcode
, conn
->id
, ctask
->itt
, datalen
);
332 case ISCSI_OP_SCSI_CMD_RSP
:
333 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
334 rc
= iscsi_scsi_cmd_rsp(conn
, hdr
, ctask
, data
,
337 case ISCSI_OP_SCSI_DATA_IN
:
338 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
339 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
340 conn
->scsirsp_pdus_cnt
++;
341 iscsi_complete_command(session
, ctask
);
345 /* LLD handles this for now */
348 rc
= ISCSI_ERR_BAD_OPCODE
;
351 } else if (itt
>= ISCSI_MGMT_ITT_OFFSET
&&
352 itt
< ISCSI_MGMT_ITT_OFFSET
+ session
->mgmtpool_max
) {
353 mtask
= session
->mgmt_cmds
[itt
- ISCSI_MGMT_ITT_OFFSET
];
355 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
356 opcode
, conn
->id
, mtask
->itt
, datalen
);
358 rc
= iscsi_check_assign_cmdsn(session
,
359 (struct iscsi_nopin
*)hdr
);
364 case ISCSI_OP_LOGOUT_RSP
:
366 rc
= ISCSI_ERR_PROTO
;
369 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
371 case ISCSI_OP_LOGIN_RSP
:
372 case ISCSI_OP_TEXT_RSP
:
374 * login related PDU's exp_statsn is handled in
377 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
378 rc
= ISCSI_ERR_CONN_FAILED
;
379 list_del(&mtask
->running
);
380 if (conn
->login_mtask
!= mtask
)
381 __kfifo_put(session
->mgmtpool
.queue
,
382 (void*)&mtask
, sizeof(void*));
384 case ISCSI_OP_SCSI_TMFUNC_RSP
:
386 rc
= ISCSI_ERR_PROTO
;
390 iscsi_tmf_rsp(conn
, hdr
);
392 case ISCSI_OP_NOOP_IN
:
393 if (hdr
->ttt
!= ISCSI_RESERVED_TAG
|| datalen
) {
394 rc
= ISCSI_ERR_PROTO
;
397 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
399 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
400 rc
= ISCSI_ERR_CONN_FAILED
;
401 list_del(&mtask
->running
);
402 if (conn
->login_mtask
!= mtask
)
403 __kfifo_put(session
->mgmtpool
.queue
,
404 (void*)&mtask
, sizeof(void*));
407 rc
= ISCSI_ERR_BAD_OPCODE
;
410 } else if (itt
== ISCSI_RESERVED_TAG
) {
412 case ISCSI_OP_NOOP_IN
:
414 rc
= ISCSI_ERR_PROTO
;
418 rc
= iscsi_check_assign_cmdsn(session
,
419 (struct iscsi_nopin
*)hdr
);
423 if (hdr
->ttt
== ISCSI_RESERVED_TAG
)
426 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, NULL
, 0))
427 rc
= ISCSI_ERR_CONN_FAILED
;
429 case ISCSI_OP_REJECT
:
430 /* we need sth like iscsi_reject_rsp()*/
431 case ISCSI_OP_ASYNC_EVENT
:
432 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
433 /* we need sth like iscsi_async_event_rsp() */
434 rc
= ISCSI_ERR_BAD_OPCODE
;
437 rc
= ISCSI_ERR_BAD_OPCODE
;
441 rc
= ISCSI_ERR_BAD_ITT
;
446 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu
);
448 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
449 char *data
, int datalen
)
453 spin_lock(&conn
->session
->lock
);
454 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
455 spin_unlock(&conn
->session
->lock
);
458 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
460 /* verify itt (itt encoding: age+cid+itt) */
461 int iscsi_verify_itt(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
464 struct iscsi_session
*session
= conn
->session
;
465 struct iscsi_cmd_task
*ctask
;
468 if (hdr
->itt
!= cpu_to_be32(ISCSI_RESERVED_TAG
)) {
469 if ((hdr
->itt
& ISCSI_AGE_MASK
) !=
470 (session
->age
<< ISCSI_AGE_SHIFT
)) {
471 printk(KERN_ERR
"iscsi: received itt %x expected "
472 "session age (%x)\n", hdr
->itt
,
473 session
->age
& ISCSI_AGE_MASK
);
474 return ISCSI_ERR_BAD_ITT
;
477 if ((hdr
->itt
& ISCSI_CID_MASK
) !=
478 (conn
->id
<< ISCSI_CID_SHIFT
)) {
479 printk(KERN_ERR
"iscsi: received itt %x, expected "
480 "CID (%x)\n", hdr
->itt
, conn
->id
);
481 return ISCSI_ERR_BAD_ITT
;
483 itt
= hdr
->itt
& ISCSI_ITT_MASK
;
487 if (itt
< session
->cmds_max
) {
488 ctask
= session
->cmds
[itt
];
491 printk(KERN_INFO
"iscsi: dropping ctask with "
492 "itt 0x%x\n", ctask
->itt
);
494 return ISCSI_ERR_NO_SCSI_CMD
;
497 if (ctask
->sc
->SCp
.phase
!= session
->age
) {
498 printk(KERN_ERR
"iscsi: ctask's session age %d, "
499 "expected %d\n", ctask
->sc
->SCp
.phase
,
501 return ISCSI_ERR_SESSION_FAILED
;
508 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
510 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
512 struct iscsi_session
*session
= conn
->session
;
515 spin_lock_irqsave(&session
->lock
, flags
);
516 if (session
->state
== ISCSI_STATE_FAILED
) {
517 spin_unlock_irqrestore(&session
->lock
, flags
);
521 if (conn
->stop_stage
== 0)
522 session
->state
= ISCSI_STATE_FAILED
;
523 spin_unlock_irqrestore(&session
->lock
, flags
);
524 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
525 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
526 iscsi_conn_error(conn
->cls_conn
, err
);
528 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
531 * iscsi_data_xmit - xmit any command into the scheduled connection
532 * @conn: iscsi connection
535 * The function can return -EAGAIN in which case the caller must
536 * re-schedule it again later or recover. '0' return code means
539 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
541 struct iscsi_transport
*tt
;
544 if (unlikely(conn
->suspend_tx
)) {
545 debug_scsi("conn %d Tx suspended!\n", conn
->id
);
548 tt
= conn
->session
->tt
;
551 * Transmit in the following order:
553 * 1) un-finished xmit (ctask or mtask)
554 * 2) immediate control PDUs
557 * 5) non-immediate control PDUs
559 * No need to lock around __kfifo_get as long as
560 * there's one producer and one consumer.
563 BUG_ON(conn
->ctask
&& conn
->mtask
);
566 rc
= tt
->xmit_cmd_task(conn
, conn
->ctask
);
569 /* done with this in-progress ctask */
573 rc
= tt
->xmit_mgmt_task(conn
, conn
->mtask
);
576 /* done with this in-progress mtask */
580 /* process immediate first */
581 if (unlikely(__kfifo_len(conn
->immqueue
))) {
582 while (__kfifo_get(conn
->immqueue
, (void*)&conn
->mtask
,
584 spin_lock_bh(&conn
->session
->lock
);
585 list_add_tail(&conn
->mtask
->running
,
586 &conn
->mgmt_run_list
);
587 spin_unlock_bh(&conn
->session
->lock
);
588 rc
= tt
->xmit_mgmt_task(conn
, conn
->mtask
);
592 /* done with this mtask */
596 /* process command queue */
597 spin_lock_bh(&conn
->session
->lock
);
598 while (!list_empty(&conn
->xmitqueue
)) {
600 * iscsi tcp may readd the task to the xmitqueue to send
603 conn
->ctask
= list_entry(conn
->xmitqueue
.next
,
604 struct iscsi_cmd_task
, running
);
605 conn
->ctask
->state
= ISCSI_TASK_RUNNING
;
606 list_move_tail(conn
->xmitqueue
.next
, &conn
->run_list
);
607 spin_unlock_bh(&conn
->session
->lock
);
609 rc
= tt
->xmit_cmd_task(conn
, conn
->ctask
);
612 spin_lock_bh(&conn
->session
->lock
);
614 spin_unlock_bh(&conn
->session
->lock
);
615 /* done with this ctask */
618 /* process the rest control plane PDUs, if any */
619 if (unlikely(__kfifo_len(conn
->mgmtqueue
))) {
620 while (__kfifo_get(conn
->mgmtqueue
, (void*)&conn
->mtask
,
622 spin_lock_bh(&conn
->session
->lock
);
623 list_add_tail(&conn
->mtask
->running
,
624 &conn
->mgmt_run_list
);
625 spin_unlock_bh(&conn
->session
->lock
);
626 rc
= tt
->xmit_mgmt_task(conn
, conn
->mtask
);
630 /* done with this mtask */
637 if (unlikely(conn
->suspend_tx
))
643 static void iscsi_xmitworker(void *data
)
645 struct iscsi_conn
*conn
= data
;
648 * serialize Xmit worker on a per-connection basis.
650 mutex_lock(&conn
->xmitmutex
);
652 rc
= iscsi_data_xmit(conn
);
653 } while (rc
>= 0 || rc
== -EAGAIN
);
654 mutex_unlock(&conn
->xmitmutex
);
658 FAILURE_BAD_HOST
= 1,
659 FAILURE_SESSION_FAILED
,
660 FAILURE_SESSION_FREED
,
661 FAILURE_WINDOW_CLOSED
,
662 FAILURE_SESSION_TERMINATE
,
663 FAILURE_SESSION_IN_RECOVERY
,
664 FAILURE_SESSION_RECOVERY_TIMEOUT
,
667 int iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
669 struct Scsi_Host
*host
;
671 struct iscsi_session
*session
;
672 struct iscsi_conn
*conn
;
673 struct iscsi_cmd_task
*ctask
= NULL
;
675 sc
->scsi_done
= done
;
678 host
= sc
->device
->host
;
679 session
= iscsi_hostdata(host
->hostdata
);
681 spin_lock(&session
->lock
);
684 * ISCSI_STATE_FAILED is a temp. state. The recovery
685 * code will decide what is best to do with command queued
688 if (session
->state
!= ISCSI_STATE_LOGGED_IN
&&
689 session
->state
!= ISCSI_STATE_FAILED
) {
691 * to handle the race between when we set the recovery state
692 * and block the session we requeue here (commands could
693 * be entering our queuecommand while a block is starting
694 * up because the block code is not locked)
696 if (session
->state
== ISCSI_STATE_IN_RECOVERY
) {
697 reason
= FAILURE_SESSION_IN_RECOVERY
;
701 if (session
->state
== ISCSI_STATE_RECOVERY_FAILED
)
702 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
703 else if (session
->state
== ISCSI_STATE_TERMINATE
)
704 reason
= FAILURE_SESSION_TERMINATE
;
706 reason
= FAILURE_SESSION_FREED
;
711 * Check for iSCSI window and take care of CmdSN wrap-around
713 if ((int)(session
->max_cmdsn
- session
->cmdsn
) < 0) {
714 reason
= FAILURE_WINDOW_CLOSED
;
718 conn
= session
->leadconn
;
720 __kfifo_get(session
->cmdpool
.queue
, (void*)&ctask
, sizeof(void*));
721 sc
->SCp
.phase
= session
->age
;
722 sc
->SCp
.ptr
= (char *)ctask
;
724 ctask
->state
= ISCSI_TASK_PENDING
;
728 INIT_LIST_HEAD(&ctask
->running
);
729 ctask
->total_length
= sc
->request_bufflen
;
730 iscsi_prep_scsi_cmd_pdu(ctask
);
732 session
->tt
->init_cmd_task(ctask
);
734 list_add_tail(&ctask
->running
, &conn
->xmitqueue
);
736 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
737 sc
->sc_data_direction
== DMA_TO_DEVICE
? "write" : "read",
738 conn
->id
, (long)sc
, ctask
->itt
, sc
->request_bufflen
,
739 session
->cmdsn
, session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
740 spin_unlock(&session
->lock
);
742 scsi_queue_work(host
, &conn
->xmitwork
);
746 spin_unlock(&session
->lock
);
747 debug_scsi("cmd 0x%x rejected (%d)\n", sc
->cmnd
[0], reason
);
748 return SCSI_MLQUEUE_HOST_BUSY
;
751 spin_unlock(&session
->lock
);
752 printk(KERN_ERR
"iscsi: cmd 0x%x is not queued (%d)\n",
753 sc
->cmnd
[0], reason
);
754 sc
->result
= (DID_NO_CONNECT
<< 16);
755 sc
->resid
= sc
->request_bufflen
;
759 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
761 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
)
763 if (depth
> ISCSI_MAX_CMD_PER_LUN
)
764 depth
= ISCSI_MAX_CMD_PER_LUN
;
765 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
766 return sdev
->queue_depth
;
768 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
771 iscsi_conn_send_generic(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
772 char *data
, uint32_t data_size
)
774 struct iscsi_session
*session
= conn
->session
;
775 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
776 struct iscsi_mgmt_task
*mtask
;
778 spin_lock_bh(&session
->lock
);
779 if (session
->state
== ISCSI_STATE_TERMINATE
) {
780 spin_unlock_bh(&session
->lock
);
783 if (hdr
->opcode
== (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) ||
784 hdr
->opcode
== (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
786 * Login and Text are sent serially, in
787 * request-followed-by-response sequence.
788 * Same mtask can be used. Same ITT must be used.
789 * Note that login_mtask is preallocated at conn_create().
791 mtask
= conn
->login_mtask
;
793 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
794 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
796 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
797 if (!__kfifo_get(session
->mgmtpool
.queue
,
798 (void*)&mtask
, sizeof(void*))) {
799 spin_unlock_bh(&session
->lock
);
805 * pre-format CmdSN for outgoing PDU.
807 if (hdr
->itt
!= cpu_to_be32(ISCSI_RESERVED_TAG
)) {
808 hdr
->itt
= mtask
->itt
| (conn
->id
<< ISCSI_CID_SHIFT
) |
809 (session
->age
<< ISCSI_AGE_SHIFT
);
810 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
811 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
812 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
815 /* do not advance CmdSN */
816 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
819 memcpy(mtask
->data
, data
, data_size
);
820 mtask
->data_count
= data_size
;
822 mtask
->data_count
= 0;
824 INIT_LIST_HEAD(&mtask
->running
);
825 memcpy(mtask
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
826 if (session
->tt
->init_mgmt_task
)
827 session
->tt
->init_mgmt_task(conn
, mtask
, data
, data_size
);
828 spin_unlock_bh(&session
->lock
);
830 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
831 hdr
->opcode
, hdr
->itt
, data_size
);
834 * since send_pdu() could be called at least from two contexts,
835 * we need to serialize __kfifo_put, so we don't have to take
836 * additional lock on fast data-path
838 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
)
839 __kfifo_put(conn
->immqueue
, (void*)&mtask
, sizeof(void*));
841 __kfifo_put(conn
->mgmtqueue
, (void*)&mtask
, sizeof(void*));
843 scsi_queue_work(session
->host
, &conn
->xmitwork
);
847 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
848 char *data
, uint32_t data_size
)
850 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
853 mutex_lock(&conn
->xmitmutex
);
854 rc
= iscsi_conn_send_generic(conn
, hdr
, data
, data_size
);
855 mutex_unlock(&conn
->xmitmutex
);
859 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
861 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
863 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
864 struct iscsi_conn
*conn
= session
->leadconn
;
866 spin_lock_bh(&session
->lock
);
867 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
868 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
870 wake_up(&conn
->ehwait
);
872 spin_unlock_bh(&session
->lock
);
874 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
876 int iscsi_eh_host_reset(struct scsi_cmnd
*sc
)
878 struct Scsi_Host
*host
= sc
->device
->host
;
879 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
880 struct iscsi_conn
*conn
= session
->leadconn
;
881 int fail_session
= 0;
883 spin_lock_bh(&session
->lock
);
884 if (session
->state
== ISCSI_STATE_TERMINATE
) {
886 debug_scsi("failing host reset: session terminated "
887 "[CID %d age %d]", conn
->id
, session
->age
);
888 spin_unlock_bh(&session
->lock
);
892 if (sc
->SCp
.phase
== session
->age
) {
893 debug_scsi("failing connection CID %d due to SCSI host reset",
897 spin_unlock_bh(&session
->lock
);
900 * we drop the lock here but the leadconn cannot be destoyed while
901 * we are in the scsi eh
904 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
906 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
907 wait_event_interruptible(conn
->ehwait
,
908 session
->state
== ISCSI_STATE_TERMINATE
||
909 session
->state
== ISCSI_STATE_LOGGED_IN
||
910 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
911 if (signal_pending(current
))
912 flush_signals(current
);
914 spin_lock_bh(&session
->lock
);
915 if (session
->state
== ISCSI_STATE_LOGGED_IN
)
916 printk(KERN_INFO
"iscsi: host reset succeeded\n");
919 spin_unlock_bh(&session
->lock
);
923 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset
);
925 static void iscsi_tmabort_timedout(unsigned long data
)
927 struct iscsi_cmd_task
*ctask
= (struct iscsi_cmd_task
*)data
;
928 struct iscsi_conn
*conn
= ctask
->conn
;
929 struct iscsi_session
*session
= conn
->session
;
931 spin_lock(&session
->lock
);
932 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
933 conn
->tmabort_state
= TMABORT_TIMEDOUT
;
934 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
935 ctask
->sc
, ctask
->itt
);
936 /* unblock eh_abort() */
937 wake_up(&conn
->ehwait
);
939 spin_unlock(&session
->lock
);
942 /* must be called with the mutex lock */
943 static int iscsi_exec_abort_task(struct scsi_cmnd
*sc
,
944 struct iscsi_cmd_task
*ctask
)
946 struct iscsi_conn
*conn
= ctask
->conn
;
947 struct iscsi_session
*session
= conn
->session
;
948 struct iscsi_tm
*hdr
= &conn
->tmhdr
;
952 * ctask timed out but session is OK requests must be serialized.
954 memset(hdr
, 0, sizeof(struct iscsi_tm
));
955 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
956 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
;
957 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
958 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
959 hdr
->rtt
= ctask
->hdr
->itt
;
960 hdr
->refcmdsn
= ctask
->hdr
->cmdsn
;
962 rc
= iscsi_conn_send_generic(conn
, (struct iscsi_hdr
*)hdr
,
965 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
966 debug_scsi("abort sent failure [itt 0x%x] %d", ctask
->itt
, rc
);
970 debug_scsi("abort sent [itt 0x%x]\n", ctask
->itt
);
972 spin_lock_bh(&session
->lock
);
973 ctask
->mtask
= (struct iscsi_mgmt_task
*)
974 session
->mgmt_cmds
[(hdr
->itt
& ISCSI_ITT_MASK
) -
975 ISCSI_MGMT_ITT_OFFSET
];
977 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
978 conn
->tmfcmd_pdus_cnt
++;
979 conn
->tmabort_timer
.expires
= 10*HZ
+ jiffies
;
980 conn
->tmabort_timer
.function
= iscsi_tmabort_timedout
;
981 conn
->tmabort_timer
.data
= (unsigned long)ctask
;
982 add_timer(&conn
->tmabort_timer
);
983 debug_scsi("abort set timeout [itt 0x%x]", ctask
->itt
);
985 spin_unlock_bh(&session
->lock
);
986 mutex_unlock(&conn
->xmitmutex
);
989 * block eh thread until:
993 * 3) session is terminated or restarted or userspace has
994 * given up on recovery
996 wait_event_interruptible(conn
->ehwait
,
997 sc
->SCp
.phase
!= session
->age
||
998 session
->state
!= ISCSI_STATE_LOGGED_IN
||
999 conn
->tmabort_state
!= TMABORT_INITIAL
);
1000 if (signal_pending(current
))
1001 flush_signals(current
);
1002 del_timer_sync(&conn
->tmabort_timer
);
1004 mutex_lock(&conn
->xmitmutex
);
1009 * xmit mutex and session lock must be held
1011 static struct iscsi_mgmt_task
*
1012 iscsi_remove_mgmt_task(struct kfifo
*fifo
, uint32_t itt
)
1014 int i
, nr_tasks
= __kfifo_len(fifo
) / sizeof(void*);
1015 struct iscsi_mgmt_task
*task
;
1017 debug_scsi("searching %d tasks\n", nr_tasks
);
1019 for (i
= 0; i
< nr_tasks
; i
++) {
1020 __kfifo_get(fifo
, (void*)&task
, sizeof(void*));
1021 debug_scsi("check task %u\n", task
->itt
);
1023 if (task
->itt
== itt
) {
1024 debug_scsi("matched task\n");
1028 __kfifo_put(fifo
, (void*)&task
, sizeof(void*));
1033 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task
*ctask
)
1035 struct iscsi_conn
*conn
= ctask
->conn
;
1036 struct iscsi_session
*session
= conn
->session
;
1041 if (!iscsi_remove_mgmt_task(conn
->immqueue
, ctask
->mtask
->itt
))
1042 list_del(&ctask
->mtask
->running
);
1043 __kfifo_put(session
->mgmtpool
.queue
, (void*)&ctask
->mtask
,
1045 ctask
->mtask
= NULL
;
1050 * session lock and xmitmutex must be held
1052 static void fail_command(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1055 struct scsi_cmnd
*sc
;
1061 conn
->session
->tt
->cleanup_cmd_task(conn
, ctask
);
1062 iscsi_ctask_mtask_cleanup(ctask
);
1065 sc
->resid
= sc
->request_bufflen
;
1066 iscsi_complete_command(conn
->session
, ctask
);
1069 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
1071 struct iscsi_cmd_task
*ctask
= (struct iscsi_cmd_task
*)sc
->SCp
.ptr
;
1072 struct iscsi_conn
*conn
= ctask
->conn
;
1073 struct iscsi_session
*session
= conn
->session
;
1076 conn
->eh_abort_cnt
++;
1077 debug_scsi("aborting [sc %p itt 0x%x]\n", sc
, ctask
->itt
);
1079 mutex_lock(&conn
->xmitmutex
);
1080 spin_lock_bh(&session
->lock
);
1083 * If we are not logged in or we have started a new session
1084 * then let the host reset code handle this
1086 if (session
->state
!= ISCSI_STATE_LOGGED_IN
||
1087 sc
->SCp
.phase
!= session
->age
)
1090 /* ctask completed before time out */
1092 spin_unlock_bh(&session
->lock
);
1093 debug_scsi("sc completed while abort in progress\n");
1094 goto success_rel_mutex
;
1097 /* what should we do here ? */
1098 if (conn
->ctask
== ctask
) {
1099 printk(KERN_INFO
"iscsi: sc %p itt 0x%x partially sent. "
1100 "Failing abort\n", sc
, ctask
->itt
);
1104 if (ctask
->state
== ISCSI_TASK_PENDING
)
1105 goto success_cleanup
;
1107 conn
->tmabort_state
= TMABORT_INITIAL
;
1109 spin_unlock_bh(&session
->lock
);
1110 rc
= iscsi_exec_abort_task(sc
, ctask
);
1111 spin_lock_bh(&session
->lock
);
1113 if (rc
|| sc
->SCp
.phase
!= session
->age
||
1114 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1116 iscsi_ctask_mtask_cleanup(ctask
);
1118 switch (conn
->tmabort_state
) {
1119 case TMABORT_SUCCESS
:
1120 goto success_cleanup
;
1121 case TMABORT_NOT_FOUND
:
1123 /* ctask completed before tmf abort response */
1124 spin_unlock_bh(&session
->lock
);
1125 debug_scsi("sc completed while abort in progress\n");
1126 goto success_rel_mutex
;
1130 /* timedout or failed */
1131 spin_unlock_bh(&session
->lock
);
1132 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1133 spin_lock_bh(&session
->lock
);
1138 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1139 spin_unlock_bh(&session
->lock
);
1142 * clean up task if aborted. we have the xmitmutex so grab
1143 * the recv lock as a writer
1145 write_lock_bh(conn
->recv_lock
);
1146 spin_lock(&session
->lock
);
1147 fail_command(conn
, ctask
, DID_ABORT
<< 16);
1148 spin_unlock(&session
->lock
);
1149 write_unlock_bh(conn
->recv_lock
);
1152 mutex_unlock(&conn
->xmitmutex
);
1156 spin_unlock_bh(&session
->lock
);
1157 mutex_unlock(&conn
->xmitmutex
);
1159 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1162 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
1165 iscsi_pool_init(struct iscsi_queue
*q
, int max
, void ***items
, int item_size
)
1169 *items
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
1174 q
->pool
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
1175 if (q
->pool
== NULL
) {
1180 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
1182 if (q
->queue
== ERR_PTR(-ENOMEM
)) {
1188 for (i
= 0; i
< max
; i
++) {
1189 q
->pool
[i
] = kmalloc(item_size
, GFP_KERNEL
);
1190 if (q
->pool
[i
] == NULL
) {
1193 for (j
= 0; j
< i
; j
++)
1196 kfifo_free(q
->queue
);
1201 memset(q
->pool
[i
], 0, item_size
);
1202 (*items
)[i
] = q
->pool
[i
];
1203 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
1207 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
1209 void iscsi_pool_free(struct iscsi_queue
*q
, void **items
)
1213 for (i
= 0; i
< q
->max
; i
++)
1218 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
1221 * iSCSI Session's hostdata organization:
1223 * *------------------* <== hostdata_session(host->hostdata)
1224 * | ptr to class sess|
1225 * |------------------| <== iscsi_hostdata(host->hostdata)
1227 * *------------------*
1230 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1231 _sz % sizeof(unsigned long))
1233 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1236 * iscsi_session_setup - create iscsi cls session and host and session
1237 * @scsit: scsi transport template
1238 * @iscsit: iscsi transport template
1239 * @initial_cmdsn: initial CmdSN
1240 * @hostno: host no allocated
1242 * This can be used by software iscsi_transports that allocate
1243 * a session per scsi host.
1245 struct iscsi_cls_session
*
1246 iscsi_session_setup(struct iscsi_transport
*iscsit
,
1247 struct scsi_transport_template
*scsit
,
1248 int cmd_task_size
, int mgmt_task_size
,
1249 uint32_t initial_cmdsn
, uint32_t *hostno
)
1251 struct Scsi_Host
*shost
;
1252 struct iscsi_session
*session
;
1253 struct iscsi_cls_session
*cls_session
;
1256 shost
= scsi_host_alloc(iscsit
->host_template
,
1257 hostdata_privsize(sizeof(*session
)));
1262 shost
->max_channel
= 0;
1263 shost
->max_lun
= iscsit
->max_lun
;
1264 shost
->max_cmd_len
= iscsit
->max_cmd_len
;
1265 shost
->transportt
= scsit
;
1266 shost
->transportt
->create_work_queue
= 1;
1267 *hostno
= shost
->host_no
;
1269 session
= iscsi_hostdata(shost
->hostdata
);
1270 memset(session
, 0, sizeof(struct iscsi_session
));
1271 session
->host
= shost
;
1272 session
->state
= ISCSI_STATE_FREE
;
1273 session
->mgmtpool_max
= ISCSI_MGMT_CMDS_MAX
;
1274 session
->cmds_max
= ISCSI_XMIT_CMDS_MAX
;
1275 session
->cmdsn
= initial_cmdsn
;
1276 session
->exp_cmdsn
= initial_cmdsn
+ 1;
1277 session
->max_cmdsn
= initial_cmdsn
+ 1;
1278 session
->max_r2t
= 1;
1279 session
->tt
= iscsit
;
1281 /* initialize SCSI PDU commands pool */
1282 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
1283 (void***)&session
->cmds
,
1284 cmd_task_size
+ sizeof(struct iscsi_cmd_task
)))
1285 goto cmdpool_alloc_fail
;
1287 /* pre-format cmds pool with ITT */
1288 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
1289 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
1292 ctask
->dd_data
= &ctask
[1];
1294 INIT_LIST_HEAD(&ctask
->running
);
1297 spin_lock_init(&session
->lock
);
1298 INIT_LIST_HEAD(&session
->connections
);
1300 /* initialize immediate command pool */
1301 if (iscsi_pool_init(&session
->mgmtpool
, session
->mgmtpool_max
,
1302 (void***)&session
->mgmt_cmds
,
1303 mgmt_task_size
+ sizeof(struct iscsi_mgmt_task
)))
1304 goto mgmtpool_alloc_fail
;
1307 /* pre-format immediate cmds pool with ITT */
1308 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++) {
1309 struct iscsi_mgmt_task
*mtask
= session
->mgmt_cmds
[cmd_i
];
1312 mtask
->dd_data
= &mtask
[1];
1313 mtask
->itt
= ISCSI_MGMT_ITT_OFFSET
+ cmd_i
;
1314 INIT_LIST_HEAD(&mtask
->running
);
1317 if (scsi_add_host(shost
, NULL
))
1320 if (!try_module_get(iscsit
->owner
))
1321 goto cls_session_fail
;
1323 cls_session
= iscsi_create_session(shost
, iscsit
, 0);
1326 *(unsigned long*)shost
->hostdata
= (unsigned long)cls_session
;
1331 module_put(iscsit
->owner
);
1333 scsi_remove_host(shost
);
1335 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
1336 mgmtpool_alloc_fail
:
1337 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
1339 scsi_host_put(shost
);
1342 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
1345 * iscsi_session_teardown - destroy session, host, and cls_session
1348 * This can be used by software iscsi_transports that allocate
1349 * a session per scsi host.
1351 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
1353 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1354 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1355 struct module
*owner
= cls_session
->transport
->owner
;
1357 scsi_remove_host(shost
);
1359 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
1360 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
1362 kfree(session
->targetname
);
1364 iscsi_destroy_session(cls_session
);
1365 scsi_host_put(shost
);
1368 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
1371 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1372 * @cls_session: iscsi_cls_session
1375 struct iscsi_cls_conn
*
1376 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, uint32_t conn_idx
)
1378 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1379 struct iscsi_conn
*conn
;
1380 struct iscsi_cls_conn
*cls_conn
;
1383 cls_conn
= iscsi_create_conn(cls_session
, conn_idx
);
1386 conn
= cls_conn
->dd_data
;
1387 memset(conn
, 0, sizeof(*conn
));
1389 conn
->session
= session
;
1390 conn
->cls_conn
= cls_conn
;
1391 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
1392 conn
->id
= conn_idx
;
1393 conn
->exp_statsn
= 0;
1394 conn
->tmabort_state
= TMABORT_INITIAL
;
1395 INIT_LIST_HEAD(&conn
->run_list
);
1396 INIT_LIST_HEAD(&conn
->mgmt_run_list
);
1397 INIT_LIST_HEAD(&conn
->xmitqueue
);
1399 /* initialize general immediate & non-immediate PDU commands queue */
1400 conn
->immqueue
= kfifo_alloc(session
->mgmtpool_max
* sizeof(void*),
1402 if (conn
->immqueue
== ERR_PTR(-ENOMEM
))
1403 goto immqueue_alloc_fail
;
1405 conn
->mgmtqueue
= kfifo_alloc(session
->mgmtpool_max
* sizeof(void*),
1407 if (conn
->mgmtqueue
== ERR_PTR(-ENOMEM
))
1408 goto mgmtqueue_alloc_fail
;
1410 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
, conn
);
1412 /* allocate login_mtask used for the login/text sequences */
1413 spin_lock_bh(&session
->lock
);
1414 if (!__kfifo_get(session
->mgmtpool
.queue
,
1415 (void*)&conn
->login_mtask
,
1417 spin_unlock_bh(&session
->lock
);
1418 goto login_mtask_alloc_fail
;
1420 spin_unlock_bh(&session
->lock
);
1422 data
= kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH
, GFP_KERNEL
);
1424 goto login_mtask_data_alloc_fail
;
1425 conn
->login_mtask
->data
= conn
->data
= data
;
1427 init_timer(&conn
->tmabort_timer
);
1428 mutex_init(&conn
->xmitmutex
);
1429 init_waitqueue_head(&conn
->ehwait
);
1433 login_mtask_data_alloc_fail
:
1434 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1436 login_mtask_alloc_fail
:
1437 kfifo_free(conn
->mgmtqueue
);
1438 mgmtqueue_alloc_fail
:
1439 kfifo_free(conn
->immqueue
);
1440 immqueue_alloc_fail
:
1441 iscsi_destroy_conn(cls_conn
);
1444 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
1447 * iscsi_conn_teardown - teardown iscsi connection
1448 * cls_conn: iscsi class connection
1450 * TODO: we may need to make this into a two step process
1451 * like scsi-mls remove + put host
1453 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
1455 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1456 struct iscsi_session
*session
= conn
->session
;
1457 unsigned long flags
;
1459 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1460 mutex_lock(&conn
->xmitmutex
);
1462 spin_lock_bh(&session
->lock
);
1463 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
1464 if (session
->leadconn
== conn
) {
1466 * leading connection? then give up on recovery.
1468 session
->state
= ISCSI_STATE_TERMINATE
;
1469 wake_up(&conn
->ehwait
);
1471 spin_unlock_bh(&session
->lock
);
1473 mutex_unlock(&conn
->xmitmutex
);
1476 * Block until all in-progress commands for this connection
1480 spin_lock_irqsave(session
->host
->host_lock
, flags
);
1481 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
1482 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1485 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1486 msleep_interruptible(500);
1487 printk(KERN_INFO
"iscsi: scsi conn_destroy(): host_busy %d "
1488 "host_failed %d\n", session
->host
->host_busy
,
1489 session
->host
->host_failed
);
1491 * force eh_abort() to unblock
1493 wake_up(&conn
->ehwait
);
1496 spin_lock_bh(&session
->lock
);
1498 kfree(conn
->persistent_address
);
1499 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1501 list_del(&conn
->item
);
1502 if (list_empty(&session
->connections
))
1503 session
->leadconn
= NULL
;
1504 if (session
->leadconn
&& session
->leadconn
== conn
)
1505 session
->leadconn
= container_of(session
->connections
.next
,
1506 struct iscsi_conn
, item
);
1508 if (session
->leadconn
== NULL
)
1509 /* no connections exits.. reset sequencing */
1510 session
->cmdsn
= session
->max_cmdsn
= session
->exp_cmdsn
= 1;
1511 spin_unlock_bh(&session
->lock
);
1513 kfifo_free(conn
->immqueue
);
1514 kfifo_free(conn
->mgmtqueue
);
1516 iscsi_destroy_conn(cls_conn
);
1518 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
1520 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
1522 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1523 struct iscsi_session
*session
= conn
->session
;
1526 printk(KERN_ERR
"iscsi: can't start unbound connection\n");
1530 if (session
->first_burst
> session
->max_burst
) {
1531 printk("iscsi: invalid burst lengths: "
1532 "first_burst %d max_burst %d\n",
1533 session
->first_burst
, session
->max_burst
);
1537 spin_lock_bh(&session
->lock
);
1538 conn
->c_stage
= ISCSI_CONN_STARTED
;
1539 session
->state
= ISCSI_STATE_LOGGED_IN
;
1541 switch(conn
->stop_stage
) {
1542 case STOP_CONN_RECOVER
:
1544 * unblock eh_abort() if it is blocked. re-try all
1545 * commands after successful recovery
1547 conn
->stop_stage
= 0;
1548 conn
->tmabort_state
= TMABORT_INITIAL
;
1550 spin_unlock_bh(&session
->lock
);
1552 iscsi_unblock_session(session_to_cls(session
));
1553 wake_up(&conn
->ehwait
);
1555 case STOP_CONN_TERM
:
1556 conn
->stop_stage
= 0;
1561 spin_unlock_bh(&session
->lock
);
1565 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
1568 flush_control_queues(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
1570 struct iscsi_mgmt_task
*mtask
, *tmp
;
1572 /* handle pending */
1573 while (__kfifo_get(conn
->immqueue
, (void*)&mtask
, sizeof(void*)) ||
1574 __kfifo_get(conn
->mgmtqueue
, (void*)&mtask
, sizeof(void*))) {
1575 if (mtask
== conn
->login_mtask
)
1577 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask
->itt
);
1578 __kfifo_put(session
->mgmtpool
.queue
, (void*)&mtask
,
1582 /* handle running */
1583 list_for_each_entry_safe(mtask
, tmp
, &conn
->mgmt_run_list
, running
) {
1584 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask
->itt
);
1585 list_del(&mtask
->running
);
1587 if (mtask
== conn
->login_mtask
)
1589 __kfifo_put(session
->mgmtpool
.queue
, (void*)&mtask
,
1596 /* Fail commands. Mutex and session lock held and recv side suspended */
1597 static void fail_all_commands(struct iscsi_conn
*conn
)
1599 struct iscsi_cmd_task
*ctask
, *tmp
;
1602 list_for_each_entry_safe(ctask
, tmp
, &conn
->xmitqueue
, running
) {
1603 debug_scsi("failing pending sc %p itt 0x%x\n", ctask
->sc
,
1605 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1608 /* fail all other running */
1609 list_for_each_entry_safe(ctask
, tmp
, &conn
->run_list
, running
) {
1610 debug_scsi("failing in progress sc %p itt 0x%x\n",
1611 ctask
->sc
, ctask
->itt
);
1612 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1618 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
1619 struct iscsi_conn
*conn
, int flag
)
1623 spin_lock_bh(&session
->lock
);
1624 if (conn
->stop_stage
== STOP_CONN_TERM
) {
1625 spin_unlock_bh(&session
->lock
);
1630 * When this is called for the in_login state, we only want to clean
1631 * up the login task and connection. We do not need to block and set
1632 * the recovery state again
1634 if (flag
== STOP_CONN_TERM
)
1635 session
->state
= ISCSI_STATE_TERMINATE
;
1636 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
1637 session
->state
= ISCSI_STATE_IN_RECOVERY
;
1639 old_stop_stage
= conn
->stop_stage
;
1640 conn
->stop_stage
= flag
;
1641 conn
->c_stage
= ISCSI_CONN_STOPPED
;
1642 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1643 spin_unlock_bh(&session
->lock
);
1645 write_lock_bh(conn
->recv_lock
);
1646 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1647 write_unlock_bh(conn
->recv_lock
);
1649 mutex_lock(&conn
->xmitmutex
);
1651 * for connection level recovery we should not calculate
1652 * header digest. conn->hdr_size used for optimization
1653 * in hdr_extract() and will be re-negotiated at
1656 if (flag
== STOP_CONN_RECOVER
) {
1657 conn
->hdrdgst_en
= 0;
1658 conn
->datadgst_en
= 0;
1659 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
1660 old_stop_stage
!= STOP_CONN_RECOVER
) {
1661 debug_scsi("blocking session\n");
1662 iscsi_block_session(session_to_cls(session
));
1669 spin_lock_bh(&session
->lock
);
1670 fail_all_commands(conn
);
1671 flush_control_queues(session
, conn
);
1672 spin_unlock_bh(&session
->lock
);
1674 mutex_unlock(&conn
->xmitmutex
);
1677 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
1679 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1680 struct iscsi_session
*session
= conn
->session
;
1683 case STOP_CONN_RECOVER
:
1684 case STOP_CONN_TERM
:
1685 iscsi_start_session_recovery(session
, conn
, flag
);
1688 printk(KERN_ERR
"iscsi: invalid stop flag %d\n", flag
);
1691 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
1693 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
1694 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
1696 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1697 struct iscsi_conn
*tmp
= ERR_PTR(-EEXIST
), *conn
= cls_conn
->dd_data
;
1699 /* lookup for existing connection */
1700 spin_lock_bh(&session
->lock
);
1701 list_for_each_entry(tmp
, &session
->connections
, item
) {
1703 if (conn
->c_stage
!= ISCSI_CONN_STOPPED
||
1704 conn
->stop_stage
== STOP_CONN_TERM
) {
1705 printk(KERN_ERR
"iscsi: can't bind "
1706 "non-stopped connection (%d:%d)\n",
1707 conn
->c_stage
, conn
->stop_stage
);
1708 spin_unlock_bh(&session
->lock
);
1715 /* bind new iSCSI connection to session */
1716 conn
->session
= session
;
1717 list_add(&conn
->item
, &session
->connections
);
1719 spin_unlock_bh(&session
->lock
);
1722 session
->leadconn
= conn
;
1725 * Unblock xmitworker(), Login Phase will pass through.
1727 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1728 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1731 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
1734 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
1735 enum iscsi_param param
, char *buf
, int buflen
)
1737 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1738 struct iscsi_session
*session
= conn
->session
;
1742 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
1743 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
1745 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
1746 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
1748 case ISCSI_PARAM_HDRDGST_EN
:
1749 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
1751 case ISCSI_PARAM_DATADGST_EN
:
1752 sscanf(buf
, "%d", &conn
->datadgst_en
);
1754 case ISCSI_PARAM_INITIAL_R2T_EN
:
1755 sscanf(buf
, "%d", &session
->initial_r2t_en
);
1757 case ISCSI_PARAM_MAX_R2T
:
1758 sscanf(buf
, "%d", &session
->max_r2t
);
1760 case ISCSI_PARAM_IMM_DATA_EN
:
1761 sscanf(buf
, "%d", &session
->imm_data_en
);
1763 case ISCSI_PARAM_FIRST_BURST
:
1764 sscanf(buf
, "%d", &session
->first_burst
);
1766 case ISCSI_PARAM_MAX_BURST
:
1767 sscanf(buf
, "%d", &session
->max_burst
);
1769 case ISCSI_PARAM_PDU_INORDER_EN
:
1770 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
1772 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
1773 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
1775 case ISCSI_PARAM_ERL
:
1776 sscanf(buf
, "%d", &session
->erl
);
1778 case ISCSI_PARAM_IFMARKER_EN
:
1779 sscanf(buf
, "%d", &value
);
1782 case ISCSI_PARAM_OFMARKER_EN
:
1783 sscanf(buf
, "%d", &value
);
1786 case ISCSI_PARAM_EXP_STATSN
:
1787 sscanf(buf
, "%u", &conn
->exp_statsn
);
1789 case ISCSI_PARAM_TARGET_NAME
:
1790 /* this should not change between logins */
1791 if (session
->targetname
)
1794 session
->targetname
= kstrdup(buf
, GFP_KERNEL
);
1795 if (!session
->targetname
)
1798 case ISCSI_PARAM_TPGT
:
1799 sscanf(buf
, "%d", &session
->tpgt
);
1801 case ISCSI_PARAM_PERSISTENT_PORT
:
1802 sscanf(buf
, "%d", &conn
->persistent_port
);
1804 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
1806 * this is the address returned in discovery so it should
1807 * not change between logins.
1809 if (conn
->persistent_address
)
1812 conn
->persistent_address
= kstrdup(buf
, GFP_KERNEL
);
1813 if (!conn
->persistent_address
)
1822 EXPORT_SYMBOL_GPL(iscsi_set_param
);
1824 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
1825 enum iscsi_param param
, char *buf
)
1827 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1828 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1832 case ISCSI_PARAM_INITIAL_R2T_EN
:
1833 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
1835 case ISCSI_PARAM_MAX_R2T
:
1836 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
1838 case ISCSI_PARAM_IMM_DATA_EN
:
1839 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
1841 case ISCSI_PARAM_FIRST_BURST
:
1842 len
= sprintf(buf
, "%u\n", session
->first_burst
);
1844 case ISCSI_PARAM_MAX_BURST
:
1845 len
= sprintf(buf
, "%u\n", session
->max_burst
);
1847 case ISCSI_PARAM_PDU_INORDER_EN
:
1848 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
1850 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
1851 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
1853 case ISCSI_PARAM_ERL
:
1854 len
= sprintf(buf
, "%d\n", session
->erl
);
1856 case ISCSI_PARAM_TARGET_NAME
:
1857 len
= sprintf(buf
, "%s\n", session
->targetname
);
1859 case ISCSI_PARAM_TPGT
:
1860 len
= sprintf(buf
, "%d\n", session
->tpgt
);
1868 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
1870 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
1871 enum iscsi_param param
, char *buf
)
1873 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1877 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
1878 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
1880 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
1881 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
1883 case ISCSI_PARAM_HDRDGST_EN
:
1884 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
1886 case ISCSI_PARAM_DATADGST_EN
:
1887 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
1889 case ISCSI_PARAM_IFMARKER_EN
:
1890 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
1892 case ISCSI_PARAM_OFMARKER_EN
:
1893 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
1895 case ISCSI_PARAM_EXP_STATSN
:
1896 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
1898 case ISCSI_PARAM_PERSISTENT_PORT
:
1899 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
1901 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
1902 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
1910 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
1912 MODULE_AUTHOR("Mike Christie");
1913 MODULE_DESCRIPTION("iSCSI library functions");
1914 MODULE_LICENSE("GPL");