4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include <linux/types.h>
25 #include <linux/kfifo.h>
26 #include <linux/delay.h>
27 #include <linux/log2.h>
28 #include <asm/unaligned.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi.h>
36 #include <scsi/iscsi_proto.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_transport_iscsi.h>
39 #include <scsi/libiscsi.h>
41 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 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
50 #define SNA32_CHECK 2147483648UL
52 static int iscsi_sna_lt(u32 n1
, u32 n2
)
54 return n1
!= n2
&& ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
55 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
58 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
59 static int iscsi_sna_lte(u32 n1
, u32 n2
)
61 return n1
== n2
|| ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
62 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
66 iscsi_update_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
68 uint32_t max_cmdsn
= be32_to_cpu(hdr
->max_cmdsn
);
69 uint32_t exp_cmdsn
= be32_to_cpu(hdr
->exp_cmdsn
);
72 * standard specifies this check for when to update expected and
73 * max sequence numbers
75 if (iscsi_sna_lt(max_cmdsn
, exp_cmdsn
- 1))
78 if (exp_cmdsn
!= session
->exp_cmdsn
&&
79 !iscsi_sna_lt(exp_cmdsn
, session
->exp_cmdsn
))
80 session
->exp_cmdsn
= exp_cmdsn
;
82 if (max_cmdsn
!= session
->max_cmdsn
&&
83 !iscsi_sna_lt(max_cmdsn
, session
->max_cmdsn
)) {
84 session
->max_cmdsn
= max_cmdsn
;
86 * if the window closed with IO queued, then kick the
89 if (!list_empty(&session
->leadconn
->xmitqueue
) ||
90 !list_empty(&session
->leadconn
->mgmtqueue
))
91 scsi_queue_work(session
->host
,
92 &session
->leadconn
->xmitwork
);
95 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn
);
97 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task
*ctask
,
98 struct iscsi_data
*hdr
)
100 struct iscsi_conn
*conn
= ctask
->conn
;
102 memset(hdr
, 0, sizeof(struct iscsi_data
));
103 hdr
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
104 hdr
->datasn
= cpu_to_be32(ctask
->unsol_datasn
);
105 ctask
->unsol_datasn
++;
106 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
107 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
109 hdr
->itt
= ctask
->hdr
->itt
;
110 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
111 hdr
->offset
= cpu_to_be32(ctask
->unsol_offset
);
113 if (ctask
->unsol_count
> conn
->max_xmit_dlength
) {
114 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
115 ctask
->data_count
= conn
->max_xmit_dlength
;
116 ctask
->unsol_offset
+= ctask
->data_count
;
119 hton24(hdr
->dlength
, ctask
->unsol_count
);
120 ctask
->data_count
= ctask
->unsol_count
;
121 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
124 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu
);
126 static int iscsi_add_hdr(struct iscsi_cmd_task
*ctask
, unsigned len
)
128 unsigned exp_len
= ctask
->hdr_len
+ len
;
130 if (exp_len
> ctask
->hdr_max
) {
135 WARN_ON(len
& (ISCSI_PAD_LEN
- 1)); /* caller must pad the AHS */
136 ctask
->hdr_len
= exp_len
;
141 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
142 * @ctask: iscsi cmd task
144 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
145 * fields like dlength or final based on how much data it sends
147 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task
*ctask
)
149 struct iscsi_conn
*conn
= ctask
->conn
;
150 struct iscsi_session
*session
= conn
->session
;
151 struct iscsi_cmd
*hdr
= ctask
->hdr
;
152 struct scsi_cmnd
*sc
= ctask
->sc
;
157 rc
= iscsi_add_hdr(ctask
, sizeof(*hdr
));
160 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
161 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
162 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
163 hdr
->itt
= build_itt(ctask
->itt
, conn
->id
, session
->age
);
164 hdr
->data_length
= cpu_to_be32(scsi_bufflen(sc
));
165 hdr
->cmdsn
= cpu_to_be32(session
->cmdsn
);
167 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
168 memcpy(hdr
->cdb
, sc
->cmnd
, sc
->cmd_len
);
169 if (sc
->cmd_len
< MAX_COMMAND_SIZE
)
170 memset(&hdr
->cdb
[sc
->cmd_len
], 0,
171 MAX_COMMAND_SIZE
- sc
->cmd_len
);
173 ctask
->imm_count
= 0;
174 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
175 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
179 * imm_count bytes to be sent right after
182 * unsol_count bytes(as Data-Out) to be sent
183 * without R2T ack right after
186 * r2t_data_count bytes to be sent via R2T ack's
188 * pad_count bytes to be sent as zero-padding
190 ctask
->unsol_count
= 0;
191 ctask
->unsol_offset
= 0;
192 ctask
->unsol_datasn
= 0;
194 if (session
->imm_data_en
) {
195 if (scsi_bufflen(sc
) >= session
->first_burst
)
196 ctask
->imm_count
= min(session
->first_burst
,
197 conn
->max_xmit_dlength
);
199 ctask
->imm_count
= min(scsi_bufflen(sc
),
200 conn
->max_xmit_dlength
);
201 hton24(hdr
->dlength
, ctask
->imm_count
);
203 zero_data(hdr
->dlength
);
205 if (!session
->initial_r2t_en
) {
206 ctask
->unsol_count
= min((session
->first_burst
),
207 (scsi_bufflen(sc
))) - ctask
->imm_count
;
208 ctask
->unsol_offset
= ctask
->imm_count
;
211 if (!ctask
->unsol_count
)
212 /* No unsolicit Data-Out's */
213 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
215 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
216 zero_data(hdr
->dlength
);
218 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
219 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
222 /* calculate size of additional header segments (AHSs) */
223 hdrlength
= ctask
->hdr_len
- sizeof(*hdr
);
225 WARN_ON(hdrlength
& (ISCSI_PAD_LEN
-1));
226 hdrlength
/= ISCSI_PAD_LEN
;
228 WARN_ON(hdrlength
>= 256);
229 hdr
->hlength
= hdrlength
& 0xFF;
231 if (conn
->session
->tt
->init_cmd_task(conn
->ctask
))
234 conn
->scsicmd_pdus_cnt
++;
235 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
236 "cmdsn %d win %d]\n",
237 sc
->sc_data_direction
== DMA_TO_DEVICE
? "write" : "read",
238 conn
->id
, sc
, sc
->cmnd
[0], ctask
->itt
, scsi_bufflen(sc
),
239 session
->cmdsn
, session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
244 * iscsi_complete_command - return command back to scsi-ml
245 * @ctask: iscsi cmd task
247 * Must be called with session lock.
248 * This function returns the scsi command to scsi-ml and returns
249 * the cmd task to the pool of available cmd tasks.
251 static void iscsi_complete_command(struct iscsi_cmd_task
*ctask
)
253 struct iscsi_conn
*conn
= ctask
->conn
;
254 struct iscsi_session
*session
= conn
->session
;
255 struct scsi_cmnd
*sc
= ctask
->sc
;
257 ctask
->state
= ISCSI_TASK_COMPLETED
;
259 /* SCSI eh reuses commands to verify us */
261 if (conn
->ctask
== ctask
)
263 list_del_init(&ctask
->running
);
264 __kfifo_put(session
->cmdpool
.queue
, (void*)&ctask
, sizeof(void*));
268 static void __iscsi_get_ctask(struct iscsi_cmd_task
*ctask
)
270 atomic_inc(&ctask
->refcount
);
273 static void __iscsi_put_ctask(struct iscsi_cmd_task
*ctask
)
275 if (atomic_dec_and_test(&ctask
->refcount
))
276 iscsi_complete_command(ctask
);
280 * session lock must be held
282 static void fail_command(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
285 struct scsi_cmnd
*sc
;
291 if (ctask
->state
== ISCSI_TASK_PENDING
)
293 * cmd never made it to the xmit thread, so we should not count
294 * the cmd in the sequencing
296 conn
->session
->queued_cmdsn
--;
298 conn
->session
->tt
->cleanup_cmd_task(conn
, ctask
);
301 scsi_set_resid(sc
, scsi_bufflen(sc
));
302 if (conn
->ctask
== ctask
)
304 /* release ref from queuecommand */
305 __iscsi_put_ctask(ctask
);
309 * iscsi_free_mgmt_task - return mgmt task back to pool
310 * @conn: iscsi connection
313 * Must be called with session lock.
315 void iscsi_free_mgmt_task(struct iscsi_conn
*conn
,
316 struct iscsi_mgmt_task
*mtask
)
318 list_del_init(&mtask
->running
);
319 if (conn
->login_mtask
== mtask
)
322 if (conn
->ping_mtask
== mtask
)
323 conn
->ping_mtask
= NULL
;
324 __kfifo_put(conn
->session
->mgmtpool
.queue
,
325 (void*)&mtask
, sizeof(void*));
327 EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task
);
329 static struct iscsi_mgmt_task
*
330 __iscsi_conn_send_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
331 char *data
, uint32_t data_size
)
333 struct iscsi_session
*session
= conn
->session
;
334 struct iscsi_mgmt_task
*mtask
;
336 if (session
->state
== ISCSI_STATE_TERMINATE
)
339 if (hdr
->opcode
== (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) ||
340 hdr
->opcode
== (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
342 * Login and Text are sent serially, in
343 * request-followed-by-response sequence.
344 * Same mtask can be used. Same ITT must be used.
345 * Note that login_mtask is preallocated at conn_create().
347 mtask
= conn
->login_mtask
;
349 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
350 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
352 if (!__kfifo_get(session
->mgmtpool
.queue
,
353 (void*)&mtask
, sizeof(void*)))
358 memcpy(mtask
->data
, data
, data_size
);
359 mtask
->data_count
= data_size
;
361 mtask
->data_count
= 0;
363 memcpy(mtask
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
364 INIT_LIST_HEAD(&mtask
->running
);
365 list_add_tail(&mtask
->running
, &conn
->mgmtqueue
);
369 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
370 char *data
, uint32_t data_size
)
372 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
373 struct iscsi_session
*session
= conn
->session
;
376 spin_lock_bh(&session
->lock
);
377 if (!__iscsi_conn_send_pdu(conn
, hdr
, data
, data_size
))
379 spin_unlock_bh(&session
->lock
);
380 scsi_queue_work(session
->host
, &conn
->xmitwork
);
383 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
386 * iscsi_cmd_rsp - SCSI Command Response processing
387 * @conn: iscsi connection
389 * @ctask: scsi command task
390 * @data: cmd data buffer
391 * @datalen: len of buffer
393 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
394 * then completes the command and task.
396 static void iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
397 struct iscsi_cmd_task
*ctask
, char *data
,
400 struct iscsi_cmd_rsp
*rhdr
= (struct iscsi_cmd_rsp
*)hdr
;
401 struct iscsi_session
*session
= conn
->session
;
402 struct scsi_cmnd
*sc
= ctask
->sc
;
404 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
405 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
407 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
409 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
410 sc
->result
= DID_ERROR
<< 16;
414 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
419 printk(KERN_ERR
"iscsi: Got CHECK_CONDITION but "
420 "invalid data buffer size of %d\n", datalen
);
421 sc
->result
= DID_BAD_TARGET
<< 16;
425 senselen
= be16_to_cpu(get_unaligned((__be16
*) data
));
426 if (datalen
< senselen
)
427 goto invalid_datalen
;
429 memcpy(sc
->sense_buffer
, data
+ 2,
430 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
431 debug_scsi("copied %d bytes of sense\n",
432 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
435 if (rhdr
->flags
& (ISCSI_FLAG_CMD_UNDERFLOW
|
436 ISCSI_FLAG_CMD_OVERFLOW
)) {
437 int res_count
= be32_to_cpu(rhdr
->residual_count
);
440 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
441 res_count
<= scsi_bufflen(sc
)))
442 scsi_set_resid(sc
, res_count
);
444 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
445 } else if (rhdr
->flags
& (ISCSI_FLAG_CMD_BIDI_UNDERFLOW
|
446 ISCSI_FLAG_CMD_BIDI_OVERFLOW
))
447 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
450 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
451 (long)sc
, sc
->result
, ctask
->itt
);
452 conn
->scsirsp_pdus_cnt
++;
454 __iscsi_put_ctask(ctask
);
457 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
459 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
461 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
462 conn
->tmfrsp_pdus_cnt
++;
464 if (conn
->tmf_state
!= TMF_QUEUED
)
467 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
468 conn
->tmf_state
= TMF_SUCCESS
;
469 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
470 conn
->tmf_state
= TMF_NOT_FOUND
;
472 conn
->tmf_state
= TMF_FAILED
;
473 wake_up(&conn
->ehwait
);
476 static void iscsi_send_nopout(struct iscsi_conn
*conn
, struct iscsi_nopin
*rhdr
)
478 struct iscsi_nopout hdr
;
479 struct iscsi_mgmt_task
*mtask
;
481 if (!rhdr
&& conn
->ping_mtask
)
484 memset(&hdr
, 0, sizeof(struct iscsi_nopout
));
485 hdr
.opcode
= ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
;
486 hdr
.flags
= ISCSI_FLAG_CMD_FINAL
;
489 memcpy(hdr
.lun
, rhdr
->lun
, 8);
491 hdr
.itt
= RESERVED_ITT
;
493 hdr
.ttt
= RESERVED_ITT
;
495 mtask
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)&hdr
, NULL
, 0);
497 printk(KERN_ERR
"Could not send nopout\n");
501 /* only track our nops */
503 conn
->ping_mtask
= mtask
;
504 conn
->last_ping
= jiffies
;
506 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
509 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
510 char *data
, int datalen
)
512 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
513 struct iscsi_hdr rejected_pdu
;
516 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
518 if (reject
->reason
== ISCSI_REASON_DATA_DIGEST_ERROR
) {
519 if (ntoh24(reject
->dlength
) > datalen
)
520 return ISCSI_ERR_PROTO
;
522 if (ntoh24(reject
->dlength
) >= sizeof(struct iscsi_hdr
)) {
523 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
524 itt
= get_itt(rejected_pdu
.itt
);
525 printk(KERN_ERR
"itt 0x%x had pdu (op 0x%x) rejected "
526 "due to DataDigest error.\n", itt
,
527 rejected_pdu
.opcode
);
534 * __iscsi_complete_pdu - complete pdu
538 * @datalen: len of data buffer
540 * Completes pdu processing by freeing any resources allocated at
541 * queuecommand or send generic. session lock must be held and verify
542 * itt must have been called.
544 static int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
545 char *data
, int datalen
)
547 struct iscsi_session
*session
= conn
->session
;
548 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
549 struct iscsi_cmd_task
*ctask
;
550 struct iscsi_mgmt_task
*mtask
;
553 conn
->last_recv
= jiffies
;
554 if (hdr
->itt
!= RESERVED_ITT
)
555 itt
= get_itt(hdr
->itt
);
559 if (itt
< session
->cmds_max
) {
560 ctask
= session
->cmds
[itt
];
562 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
563 opcode
, conn
->id
, ctask
->itt
, datalen
);
566 case ISCSI_OP_SCSI_CMD_RSP
:
567 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
568 iscsi_scsi_cmd_rsp(conn
, hdr
, ctask
, data
,
571 case ISCSI_OP_SCSI_DATA_IN
:
572 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
573 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
574 conn
->scsirsp_pdus_cnt
++;
575 __iscsi_put_ctask(ctask
);
579 /* LLD handles this for now */
582 rc
= ISCSI_ERR_BAD_OPCODE
;
585 } else if (itt
>= ISCSI_MGMT_ITT_OFFSET
&&
586 itt
< ISCSI_MGMT_ITT_OFFSET
+ session
->mgmtpool_max
) {
587 mtask
= session
->mgmt_cmds
[itt
- ISCSI_MGMT_ITT_OFFSET
];
589 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
590 opcode
, conn
->id
, mtask
->itt
, datalen
);
592 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
594 case ISCSI_OP_LOGOUT_RSP
:
596 rc
= ISCSI_ERR_PROTO
;
599 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
601 case ISCSI_OP_LOGIN_RSP
:
602 case ISCSI_OP_TEXT_RSP
:
604 * login related PDU's exp_statsn is handled in
607 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
608 rc
= ISCSI_ERR_CONN_FAILED
;
609 iscsi_free_mgmt_task(conn
, mtask
);
611 case ISCSI_OP_SCSI_TMFUNC_RSP
:
613 rc
= ISCSI_ERR_PROTO
;
617 iscsi_tmf_rsp(conn
, hdr
);
618 iscsi_free_mgmt_task(conn
, mtask
);
620 case ISCSI_OP_NOOP_IN
:
621 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) ||
623 rc
= ISCSI_ERR_PROTO
;
626 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
628 if (conn
->ping_mtask
!= mtask
) {
630 * If this is not in response to one of our
631 * nops then it must be from userspace.
633 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
,
635 rc
= ISCSI_ERR_CONN_FAILED
;
637 iscsi_free_mgmt_task(conn
, mtask
);
640 rc
= ISCSI_ERR_BAD_OPCODE
;
643 } else if (itt
== ~0U) {
644 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
647 case ISCSI_OP_NOOP_IN
:
649 rc
= ISCSI_ERR_PROTO
;
653 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
656 iscsi_send_nopout(conn
, (struct iscsi_nopin
*)hdr
);
658 case ISCSI_OP_REJECT
:
659 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
661 case ISCSI_OP_ASYNC_EVENT
:
662 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
663 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
664 rc
= ISCSI_ERR_CONN_FAILED
;
667 rc
= ISCSI_ERR_BAD_OPCODE
;
671 rc
= ISCSI_ERR_BAD_ITT
;
676 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
677 char *data
, int datalen
)
681 spin_lock(&conn
->session
->lock
);
682 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
683 spin_unlock(&conn
->session
->lock
);
686 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
688 /* verify itt (itt encoding: age+cid+itt) */
689 int iscsi_verify_itt(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
692 struct iscsi_session
*session
= conn
->session
;
693 struct iscsi_cmd_task
*ctask
;
696 if (hdr
->itt
!= RESERVED_ITT
) {
697 if (((__force u32
)hdr
->itt
& ISCSI_AGE_MASK
) !=
698 (session
->age
<< ISCSI_AGE_SHIFT
)) {
699 printk(KERN_ERR
"iscsi: received itt %x expected "
700 "session age (%x)\n", (__force u32
)hdr
->itt
,
701 session
->age
& ISCSI_AGE_MASK
);
702 return ISCSI_ERR_BAD_ITT
;
705 if (((__force u32
)hdr
->itt
& ISCSI_CID_MASK
) !=
706 (conn
->id
<< ISCSI_CID_SHIFT
)) {
707 printk(KERN_ERR
"iscsi: received itt %x, expected "
708 "CID (%x)\n", (__force u32
)hdr
->itt
, conn
->id
);
709 return ISCSI_ERR_BAD_ITT
;
711 itt
= get_itt(hdr
->itt
);
715 if (itt
< session
->cmds_max
) {
716 ctask
= session
->cmds
[itt
];
719 printk(KERN_INFO
"iscsi: dropping ctask with "
720 "itt 0x%x\n", ctask
->itt
);
722 return ISCSI_ERR_NO_SCSI_CMD
;
725 if (ctask
->sc
->SCp
.phase
!= session
->age
) {
726 printk(KERN_ERR
"iscsi: ctask's session age %d, "
727 "expected %d\n", ctask
->sc
->SCp
.phase
,
729 return ISCSI_ERR_SESSION_FAILED
;
736 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
738 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
740 struct iscsi_session
*session
= conn
->session
;
743 spin_lock_irqsave(&session
->lock
, flags
);
744 if (session
->state
== ISCSI_STATE_FAILED
) {
745 spin_unlock_irqrestore(&session
->lock
, flags
);
749 if (conn
->stop_stage
== 0)
750 session
->state
= ISCSI_STATE_FAILED
;
751 spin_unlock_irqrestore(&session
->lock
, flags
);
752 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
753 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
754 iscsi_conn_error(conn
->cls_conn
, err
);
756 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
758 static void iscsi_prep_mtask(struct iscsi_conn
*conn
,
759 struct iscsi_mgmt_task
*mtask
)
761 struct iscsi_session
*session
= conn
->session
;
762 struct iscsi_hdr
*hdr
= mtask
->hdr
;
763 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
765 if (hdr
->opcode
!= (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) &&
766 hdr
->opcode
!= (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
767 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
769 * pre-format CmdSN for outgoing PDU.
771 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
772 if (hdr
->itt
!= RESERVED_ITT
) {
773 hdr
->itt
= build_itt(mtask
->itt
, conn
->id
, session
->age
);
775 * TODO: We always use immediate, so we never hit this.
776 * If we start to send tmfs or nops as non-immediate then
777 * we should start checking the cmdsn numbers for mgmt tasks.
779 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
780 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
781 session
->queued_cmdsn
++;
786 if (session
->tt
->init_mgmt_task
)
787 session
->tt
->init_mgmt_task(conn
, mtask
);
789 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
790 hdr
->opcode
& ISCSI_OPCODE_MASK
, hdr
->itt
,
794 static int iscsi_xmit_mtask(struct iscsi_conn
*conn
)
796 struct iscsi_hdr
*hdr
= conn
->mtask
->hdr
;
799 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
)
800 conn
->session
->state
= ISCSI_STATE_LOGGING_OUT
;
801 spin_unlock_bh(&conn
->session
->lock
);
803 rc
= conn
->session
->tt
->xmit_mgmt_task(conn
, conn
->mtask
);
804 spin_lock_bh(&conn
->session
->lock
);
808 /* done with this in-progress mtask */
813 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn
*conn
)
815 struct iscsi_session
*session
= conn
->session
;
818 * Check for iSCSI window and take care of CmdSN wrap-around
820 if (!iscsi_sna_lte(session
->queued_cmdsn
, session
->max_cmdsn
)) {
821 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
822 "CmdSN %u/%u\n", session
->exp_cmdsn
,
823 session
->max_cmdsn
, session
->cmdsn
,
824 session
->queued_cmdsn
);
830 static int iscsi_xmit_ctask(struct iscsi_conn
*conn
)
832 struct iscsi_cmd_task
*ctask
= conn
->ctask
;
835 __iscsi_get_ctask(ctask
);
836 spin_unlock_bh(&conn
->session
->lock
);
837 rc
= conn
->session
->tt
->xmit_cmd_task(conn
, ctask
);
838 spin_lock_bh(&conn
->session
->lock
);
839 __iscsi_put_ctask(ctask
);
841 /* done with this ctask */
847 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
848 * @ctask: ctask to requeue
850 * LLDs that need to run a ctask from the session workqueue should call
851 * this. The session lock must be held.
853 void iscsi_requeue_ctask(struct iscsi_cmd_task
*ctask
)
855 struct iscsi_conn
*conn
= ctask
->conn
;
857 list_move_tail(&ctask
->running
, &conn
->requeue
);
858 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
860 EXPORT_SYMBOL_GPL(iscsi_requeue_ctask
);
863 * iscsi_data_xmit - xmit any command into the scheduled connection
864 * @conn: iscsi connection
867 * The function can return -EAGAIN in which case the caller must
868 * re-schedule it again later or recover. '0' return code means
871 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
875 spin_lock_bh(&conn
->session
->lock
);
876 if (unlikely(conn
->suspend_tx
)) {
877 debug_scsi("conn %d Tx suspended!\n", conn
->id
);
878 spin_unlock_bh(&conn
->session
->lock
);
883 rc
= iscsi_xmit_ctask(conn
);
889 rc
= iscsi_xmit_mtask(conn
);
895 * process mgmt pdus like nops before commands since we should
896 * only have one nop-out as a ping from us and targets should not
897 * overflow us with nop-ins
900 while (!list_empty(&conn
->mgmtqueue
)) {
901 conn
->mtask
= list_entry(conn
->mgmtqueue
.next
,
902 struct iscsi_mgmt_task
, running
);
903 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
904 iscsi_free_mgmt_task(conn
, conn
->mtask
);
909 iscsi_prep_mtask(conn
, conn
->mtask
);
910 list_move_tail(conn
->mgmtqueue
.next
, &conn
->mgmt_run_list
);
911 rc
= iscsi_xmit_mtask(conn
);
916 /* process pending command queue */
917 while (!list_empty(&conn
->xmitqueue
)) {
918 if (conn
->tmf_state
== TMF_QUEUED
)
921 conn
->ctask
= list_entry(conn
->xmitqueue
.next
,
922 struct iscsi_cmd_task
, running
);
923 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
924 fail_command(conn
, conn
->ctask
, DID_IMM_RETRY
<< 16);
927 if (iscsi_prep_scsi_cmd_pdu(conn
->ctask
)) {
928 fail_command(conn
, conn
->ctask
, DID_ABORT
<< 16);
932 conn
->ctask
->state
= ISCSI_TASK_RUNNING
;
933 list_move_tail(conn
->xmitqueue
.next
, &conn
->run_list
);
934 rc
= iscsi_xmit_ctask(conn
);
938 * we could continuously get new ctask requests so
939 * we need to check the mgmt queue for nops that need to
940 * be sent to aviod starvation
942 if (!list_empty(&conn
->mgmtqueue
))
946 while (!list_empty(&conn
->requeue
)) {
947 if (conn
->session
->fast_abort
&& conn
->tmf_state
!= TMF_INITIAL
)
951 * we always do fastlogout - conn stop code will clean up.
953 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
956 conn
->ctask
= list_entry(conn
->requeue
.next
,
957 struct iscsi_cmd_task
, running
);
958 conn
->ctask
->state
= ISCSI_TASK_RUNNING
;
959 list_move_tail(conn
->requeue
.next
, &conn
->run_list
);
960 rc
= iscsi_xmit_ctask(conn
);
963 if (!list_empty(&conn
->mgmtqueue
))
966 spin_unlock_bh(&conn
->session
->lock
);
970 if (unlikely(conn
->suspend_tx
))
972 spin_unlock_bh(&conn
->session
->lock
);
976 static void iscsi_xmitworker(struct work_struct
*work
)
978 struct iscsi_conn
*conn
=
979 container_of(work
, struct iscsi_conn
, xmitwork
);
982 * serialize Xmit worker on a per-connection basis.
985 rc
= iscsi_data_xmit(conn
);
986 } while (rc
>= 0 || rc
== -EAGAIN
);
990 FAILURE_BAD_HOST
= 1,
991 FAILURE_SESSION_FAILED
,
992 FAILURE_SESSION_FREED
,
993 FAILURE_WINDOW_CLOSED
,
995 FAILURE_SESSION_TERMINATE
,
996 FAILURE_SESSION_IN_RECOVERY
,
997 FAILURE_SESSION_RECOVERY_TIMEOUT
,
998 FAILURE_SESSION_LOGGING_OUT
,
1001 int iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
1003 struct Scsi_Host
*host
;
1005 struct iscsi_session
*session
;
1006 struct iscsi_conn
*conn
;
1007 struct iscsi_cmd_task
*ctask
= NULL
;
1009 sc
->scsi_done
= done
;
1013 host
= sc
->device
->host
;
1014 spin_unlock(host
->host_lock
);
1016 session
= iscsi_hostdata(host
->hostdata
);
1017 spin_lock(&session
->lock
);
1020 * ISCSI_STATE_FAILED is a temp. state. The recovery
1021 * code will decide what is best to do with command queued
1024 if (session
->state
!= ISCSI_STATE_LOGGED_IN
&&
1025 session
->state
!= ISCSI_STATE_FAILED
) {
1027 * to handle the race between when we set the recovery state
1028 * and block the session we requeue here (commands could
1029 * be entering our queuecommand while a block is starting
1030 * up because the block code is not locked)
1032 switch (session
->state
) {
1033 case ISCSI_STATE_IN_RECOVERY
:
1034 reason
= FAILURE_SESSION_IN_RECOVERY
;
1036 case ISCSI_STATE_LOGGING_OUT
:
1037 reason
= FAILURE_SESSION_LOGGING_OUT
;
1039 case ISCSI_STATE_RECOVERY_FAILED
:
1040 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
1042 case ISCSI_STATE_TERMINATE
:
1043 reason
= FAILURE_SESSION_TERMINATE
;
1046 reason
= FAILURE_SESSION_FREED
;
1051 conn
= session
->leadconn
;
1053 reason
= FAILURE_SESSION_FREED
;
1057 if (iscsi_check_cmdsn_window_closed(conn
)) {
1058 reason
= FAILURE_WINDOW_CLOSED
;
1062 if (!__kfifo_get(session
->cmdpool
.queue
, (void*)&ctask
,
1064 reason
= FAILURE_OOM
;
1067 session
->queued_cmdsn
++;
1069 sc
->SCp
.phase
= session
->age
;
1070 sc
->SCp
.ptr
= (char *)ctask
;
1072 atomic_set(&ctask
->refcount
, 1);
1073 ctask
->state
= ISCSI_TASK_PENDING
;
1076 INIT_LIST_HEAD(&ctask
->running
);
1078 list_add_tail(&ctask
->running
, &conn
->xmitqueue
);
1079 spin_unlock(&session
->lock
);
1081 scsi_queue_work(host
, &conn
->xmitwork
);
1082 spin_lock(host
->host_lock
);
1086 spin_unlock(&session
->lock
);
1087 debug_scsi("cmd 0x%x rejected (%d)\n", sc
->cmnd
[0], reason
);
1088 spin_lock(host
->host_lock
);
1089 return SCSI_MLQUEUE_HOST_BUSY
;
1092 spin_unlock(&session
->lock
);
1093 printk(KERN_ERR
"iscsi: cmd 0x%x is not queued (%d)\n",
1094 sc
->cmnd
[0], reason
);
1095 sc
->result
= (DID_NO_CONNECT
<< 16);
1096 scsi_set_resid(sc
, scsi_bufflen(sc
));
1098 spin_lock(host
->host_lock
);
1101 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
1103 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
)
1105 if (depth
> ISCSI_MAX_CMD_PER_LUN
)
1106 depth
= ISCSI_MAX_CMD_PER_LUN
;
1107 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
1108 return sdev
->queue_depth
;
1110 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
1112 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
1114 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1116 spin_lock_bh(&session
->lock
);
1117 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1118 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
1119 if (session
->leadconn
)
1120 wake_up(&session
->leadconn
->ehwait
);
1122 spin_unlock_bh(&session
->lock
);
1124 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
1126 int iscsi_eh_host_reset(struct scsi_cmnd
*sc
)
1128 struct Scsi_Host
*host
= sc
->device
->host
;
1129 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
1130 struct iscsi_conn
*conn
= session
->leadconn
;
1132 mutex_lock(&session
->eh_mutex
);
1133 spin_lock_bh(&session
->lock
);
1134 if (session
->state
== ISCSI_STATE_TERMINATE
) {
1136 debug_scsi("failing host reset: session terminated "
1137 "[CID %d age %d]\n", conn
->id
, session
->age
);
1138 spin_unlock_bh(&session
->lock
);
1139 mutex_unlock(&session
->eh_mutex
);
1143 spin_unlock_bh(&session
->lock
);
1144 mutex_unlock(&session
->eh_mutex
);
1146 * we drop the lock here but the leadconn cannot be destoyed while
1147 * we are in the scsi eh
1149 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1151 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1152 wait_event_interruptible(conn
->ehwait
,
1153 session
->state
== ISCSI_STATE_TERMINATE
||
1154 session
->state
== ISCSI_STATE_LOGGED_IN
||
1155 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
1156 if (signal_pending(current
))
1157 flush_signals(current
);
1159 mutex_lock(&session
->eh_mutex
);
1160 spin_lock_bh(&session
->lock
);
1161 if (session
->state
== ISCSI_STATE_LOGGED_IN
)
1162 printk(KERN_INFO
"iscsi: host reset succeeded\n");
1165 spin_unlock_bh(&session
->lock
);
1166 mutex_unlock(&session
->eh_mutex
);
1169 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset
);
1171 static void iscsi_tmf_timedout(unsigned long data
)
1173 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1174 struct iscsi_session
*session
= conn
->session
;
1176 spin_lock(&session
->lock
);
1177 if (conn
->tmf_state
== TMF_QUEUED
) {
1178 conn
->tmf_state
= TMF_TIMEDOUT
;
1179 debug_scsi("tmf timedout\n");
1180 /* unblock eh_abort() */
1181 wake_up(&conn
->ehwait
);
1183 spin_unlock(&session
->lock
);
1186 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn
*conn
,
1187 struct iscsi_tm
*hdr
, int age
,
1190 struct iscsi_session
*session
= conn
->session
;
1191 struct iscsi_mgmt_task
*mtask
;
1193 mtask
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)hdr
,
1196 spin_unlock_bh(&session
->lock
);
1197 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1198 spin_lock_bh(&session
->lock
);
1199 debug_scsi("tmf exec failure\n");
1202 conn
->tmfcmd_pdus_cnt
++;
1203 conn
->tmf_timer
.expires
= timeout
* HZ
+ jiffies
;
1204 conn
->tmf_timer
.function
= iscsi_tmf_timedout
;
1205 conn
->tmf_timer
.data
= (unsigned long)conn
;
1206 add_timer(&conn
->tmf_timer
);
1207 debug_scsi("tmf set timeout\n");
1209 spin_unlock_bh(&session
->lock
);
1210 mutex_unlock(&session
->eh_mutex
);
1211 scsi_queue_work(session
->host
, &conn
->xmitwork
);
1214 * block eh thread until:
1218 * 3) session is terminated or restarted or userspace has
1219 * given up on recovery
1221 wait_event_interruptible(conn
->ehwait
, age
!= session
->age
||
1222 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1223 conn
->tmf_state
!= TMF_QUEUED
);
1224 if (signal_pending(current
))
1225 flush_signals(current
);
1226 del_timer_sync(&conn
->tmf_timer
);
1228 mutex_lock(&session
->eh_mutex
);
1229 spin_lock_bh(&session
->lock
);
1230 /* if the session drops it will clean up the mtask */
1231 if (age
!= session
->age
||
1232 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1238 * Fail commands. session lock held and recv side suspended and xmit
1241 static void fail_all_commands(struct iscsi_conn
*conn
, unsigned lun
)
1243 struct iscsi_cmd_task
*ctask
, *tmp
;
1245 if (conn
->ctask
&& (conn
->ctask
->sc
->device
->lun
== lun
|| lun
== -1))
1249 list_for_each_entry_safe(ctask
, tmp
, &conn
->xmitqueue
, running
) {
1250 if (lun
== ctask
->sc
->device
->lun
|| lun
== -1) {
1251 debug_scsi("failing pending sc %p itt 0x%x\n",
1252 ctask
->sc
, ctask
->itt
);
1253 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1257 list_for_each_entry_safe(ctask
, tmp
, &conn
->requeue
, running
) {
1258 if (lun
== ctask
->sc
->device
->lun
|| lun
== -1) {
1259 debug_scsi("failing requeued sc %p itt 0x%x\n",
1260 ctask
->sc
, ctask
->itt
);
1261 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1265 /* fail all other running */
1266 list_for_each_entry_safe(ctask
, tmp
, &conn
->run_list
, running
) {
1267 if (lun
== ctask
->sc
->device
->lun
|| lun
== -1) {
1268 debug_scsi("failing in progress sc %p itt 0x%x\n",
1269 ctask
->sc
, ctask
->itt
);
1270 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1275 static void iscsi_suspend_tx(struct iscsi_conn
*conn
)
1277 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1278 scsi_flush_work(conn
->session
->host
);
1281 static void iscsi_start_tx(struct iscsi_conn
*conn
)
1283 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1284 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
1287 static enum scsi_eh_timer_return
iscsi_eh_cmd_timed_out(struct scsi_cmnd
*scmd
)
1289 struct iscsi_cls_session
*cls_session
;
1290 struct iscsi_session
*session
;
1291 struct iscsi_conn
*conn
;
1292 enum scsi_eh_timer_return rc
= EH_NOT_HANDLED
;
1294 cls_session
= starget_to_session(scsi_target(scmd
->device
));
1295 session
= class_to_transport_session(cls_session
);
1297 debug_scsi("scsi cmd %p timedout\n", scmd
);
1299 spin_lock(&session
->lock
);
1300 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1302 * We are probably in the middle of iscsi recovery so let
1303 * that complete and handle the error.
1305 rc
= EH_RESET_TIMER
;
1309 conn
= session
->leadconn
;
1311 /* In the middle of shuting down */
1312 rc
= EH_RESET_TIMER
;
1316 if (!conn
->recv_timeout
&& !conn
->ping_timeout
)
1319 * if the ping timedout then we are in the middle of cleaning up
1320 * and can let the iscsi eh handle it
1322 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
) +
1323 (conn
->ping_timeout
* HZ
), jiffies
))
1324 rc
= EH_RESET_TIMER
;
1326 * if we are about to check the transport then give the command
1329 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
),
1331 rc
= EH_RESET_TIMER
;
1332 /* if in the middle of checking the transport then give us more time */
1333 if (conn
->ping_mtask
)
1334 rc
= EH_RESET_TIMER
;
1336 spin_unlock(&session
->lock
);
1337 debug_scsi("return %s\n", rc
== EH_RESET_TIMER
? "timer reset" : "nh");
1341 static void iscsi_check_transport_timeouts(unsigned long data
)
1343 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1344 struct iscsi_session
*session
= conn
->session
;
1345 unsigned long timeout
, next_timeout
= 0, last_recv
;
1347 spin_lock(&session
->lock
);
1348 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
1351 timeout
= conn
->recv_timeout
;
1356 last_recv
= conn
->last_recv
;
1357 if (time_before_eq(last_recv
+ timeout
+ (conn
->ping_timeout
* HZ
),
1359 printk(KERN_ERR
"ping timeout of %d secs expired, "
1360 "last rx %lu, last ping %lu, now %lu\n",
1361 conn
->ping_timeout
, last_recv
,
1362 conn
->last_ping
, jiffies
);
1363 spin_unlock(&session
->lock
);
1364 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1368 if (time_before_eq(last_recv
+ timeout
, jiffies
)) {
1369 if (time_before_eq(conn
->last_ping
, last_recv
)) {
1370 /* send a ping to try to provoke some traffic */
1371 debug_scsi("Sending nopout as ping on conn %p\n", conn
);
1372 iscsi_send_nopout(conn
, NULL
);
1374 next_timeout
= last_recv
+ timeout
+ (conn
->ping_timeout
* HZ
);
1376 next_timeout
= last_recv
+ timeout
;
1380 debug_scsi("Setting next tmo %lu\n", next_timeout
);
1381 mod_timer(&conn
->transport_timer
, next_timeout
);
1384 spin_unlock(&session
->lock
);
1387 static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task
*ctask
,
1388 struct iscsi_tm
*hdr
)
1390 memset(hdr
, 0, sizeof(*hdr
));
1391 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1392 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
& ISCSI_FLAG_TM_FUNC_MASK
;
1393 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1394 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
1395 hdr
->rtt
= ctask
->hdr
->itt
;
1396 hdr
->refcmdsn
= ctask
->hdr
->cmdsn
;
1399 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
1401 struct Scsi_Host
*host
= sc
->device
->host
;
1402 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
1403 struct iscsi_conn
*conn
;
1404 struct iscsi_cmd_task
*ctask
;
1405 struct iscsi_tm
*hdr
;
1408 mutex_lock(&session
->eh_mutex
);
1409 spin_lock_bh(&session
->lock
);
1411 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1415 debug_scsi("sc never reached iscsi layer or it completed.\n");
1416 spin_unlock_bh(&session
->lock
);
1417 mutex_unlock(&session
->eh_mutex
);
1422 * If we are not logged in or we have started a new session
1423 * then let the host reset code handle this
1425 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
||
1426 sc
->SCp
.phase
!= session
->age
) {
1427 spin_unlock_bh(&session
->lock
);
1428 mutex_unlock(&session
->eh_mutex
);
1432 conn
= session
->leadconn
;
1433 conn
->eh_abort_cnt
++;
1436 ctask
= (struct iscsi_cmd_task
*)sc
->SCp
.ptr
;
1437 debug_scsi("aborting [sc %p itt 0x%x]\n", sc
, ctask
->itt
);
1439 /* ctask completed before time out */
1441 debug_scsi("sc completed while abort in progress\n");
1445 if (ctask
->state
== ISCSI_TASK_PENDING
) {
1446 fail_command(conn
, ctask
, DID_ABORT
<< 16);
1450 /* only have one tmf outstanding at a time */
1451 if (conn
->tmf_state
!= TMF_INITIAL
)
1453 conn
->tmf_state
= TMF_QUEUED
;
1456 iscsi_prep_abort_task_pdu(ctask
, hdr
);
1458 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, age
, session
->abort_timeout
)) {
1463 switch (conn
->tmf_state
) {
1465 spin_unlock_bh(&session
->lock
);
1466 iscsi_suspend_tx(conn
);
1468 * clean up task if aborted. grab the recv lock as a writer
1470 write_lock_bh(conn
->recv_lock
);
1471 spin_lock(&session
->lock
);
1472 fail_command(conn
, ctask
, DID_ABORT
<< 16);
1473 conn
->tmf_state
= TMF_INITIAL
;
1474 spin_unlock(&session
->lock
);
1475 write_unlock_bh(conn
->recv_lock
);
1476 iscsi_start_tx(conn
);
1477 goto success_unlocked
;
1479 spin_unlock_bh(&session
->lock
);
1480 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1481 goto failed_unlocked
;
1484 conn
->tmf_state
= TMF_INITIAL
;
1485 /* ctask completed before tmf abort response */
1486 debug_scsi("sc completed while abort in progress\n");
1491 conn
->tmf_state
= TMF_INITIAL
;
1496 spin_unlock_bh(&session
->lock
);
1498 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1499 mutex_unlock(&session
->eh_mutex
);
1503 spin_unlock_bh(&session
->lock
);
1505 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc
,
1506 ctask
? ctask
->itt
: 0);
1507 mutex_unlock(&session
->eh_mutex
);
1510 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
1512 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
1514 memset(hdr
, 0, sizeof(*hdr
));
1515 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1516 hdr
->flags
= ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
1517 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1518 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
1519 hdr
->rtt
= RESERVED_ITT
;
1522 int iscsi_eh_device_reset(struct scsi_cmnd
*sc
)
1524 struct Scsi_Host
*host
= sc
->device
->host
;
1525 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
1526 struct iscsi_conn
*conn
;
1527 struct iscsi_tm
*hdr
;
1530 debug_scsi("LU Reset [sc %p lun %u]\n", sc
, sc
->device
->lun
);
1532 mutex_lock(&session
->eh_mutex
);
1533 spin_lock_bh(&session
->lock
);
1535 * Just check if we are not logged in. We cannot check for
1536 * the phase because the reset could come from a ioctl.
1538 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
1540 conn
= session
->leadconn
;
1542 /* only have one tmf outstanding at a time */
1543 if (conn
->tmf_state
!= TMF_INITIAL
)
1545 conn
->tmf_state
= TMF_QUEUED
;
1548 iscsi_prep_lun_reset_pdu(sc
, hdr
);
1550 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
1551 session
->lu_reset_timeout
)) {
1556 switch (conn
->tmf_state
) {
1560 spin_unlock_bh(&session
->lock
);
1561 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1564 conn
->tmf_state
= TMF_INITIAL
;
1569 spin_unlock_bh(&session
->lock
);
1571 iscsi_suspend_tx(conn
);
1572 /* need to grab the recv lock then session lock */
1573 write_lock_bh(conn
->recv_lock
);
1574 spin_lock(&session
->lock
);
1575 fail_all_commands(conn
, sc
->device
->lun
);
1576 conn
->tmf_state
= TMF_INITIAL
;
1577 spin_unlock(&session
->lock
);
1578 write_unlock_bh(conn
->recv_lock
);
1580 iscsi_start_tx(conn
);
1584 spin_unlock_bh(&session
->lock
);
1586 debug_scsi("iscsi_eh_device_reset %s\n",
1587 rc
== SUCCESS
? "SUCCESS" : "FAILED");
1588 mutex_unlock(&session
->eh_mutex
);
1591 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset
);
1594 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1595 * should be accessed via kfifo_{get,put} on q->queue.
1596 * Optionally, the caller can obtain the array of object pointers
1597 * by passing in a non-NULL @items pointer
1600 iscsi_pool_init(struct iscsi_pool
*q
, int max
, void ***items
, int item_size
)
1602 int i
, num_arrays
= 1;
1604 memset(q
, 0, sizeof(*q
));
1608 /* If the user passed an items pointer, he wants a copy of
1612 q
->pool
= kzalloc(num_arrays
* max
* sizeof(void*), GFP_KERNEL
);
1613 if (q
->pool
== NULL
)
1616 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
1618 if (q
->queue
== ERR_PTR(-ENOMEM
))
1621 for (i
= 0; i
< max
; i
++) {
1622 q
->pool
[i
] = kzalloc(item_size
, GFP_KERNEL
);
1623 if (q
->pool
[i
] == NULL
) {
1627 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
1631 *items
= q
->pool
+ max
;
1632 memcpy(*items
, q
->pool
, max
* sizeof(void *));
1641 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
1643 void iscsi_pool_free(struct iscsi_pool
*q
)
1647 for (i
= 0; i
< q
->max
; i
++)
1652 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
1655 * iSCSI Session's hostdata organization:
1657 * *------------------* <== hostdata_session(host->hostdata)
1658 * | ptr to class sess|
1659 * |------------------| <== iscsi_hostdata(host->hostdata)
1661 * *------------------*
1664 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1665 _sz % sizeof(unsigned long))
1667 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1670 * iscsi_session_setup - create iscsi cls session and host and session
1671 * @scsit: scsi transport template
1672 * @iscsit: iscsi transport template
1673 * @cmds_max: scsi host can queue
1674 * @qdepth: scsi host cmds per lun
1675 * @cmd_task_size: LLD ctask private data size
1676 * @mgmt_task_size: LLD mtask private data size
1677 * @initial_cmdsn: initial CmdSN
1678 * @hostno: host no allocated
1680 * This can be used by software iscsi_transports that allocate
1681 * a session per scsi host.
1683 struct iscsi_cls_session
*
1684 iscsi_session_setup(struct iscsi_transport
*iscsit
,
1685 struct scsi_transport_template
*scsit
,
1686 uint16_t cmds_max
, uint16_t qdepth
,
1687 int cmd_task_size
, int mgmt_task_size
,
1688 uint32_t initial_cmdsn
, uint32_t *hostno
)
1690 struct Scsi_Host
*shost
;
1691 struct iscsi_session
*session
;
1692 struct iscsi_cls_session
*cls_session
;
1695 if (qdepth
> ISCSI_MAX_CMD_PER_LUN
|| qdepth
< 1) {
1697 printk(KERN_ERR
"iscsi: invalid queue depth of %d. "
1698 "Queue depth must be between 1 and %d.\n",
1699 qdepth
, ISCSI_MAX_CMD_PER_LUN
);
1700 qdepth
= ISCSI_DEF_CMD_PER_LUN
;
1703 if (!is_power_of_2(cmds_max
) ||
1704 cmds_max
>= ISCSI_MGMT_ITT_OFFSET
) {
1706 printk(KERN_ERR
"iscsi: invalid can_queue of %d. "
1707 "can_queue must be a power of 2 and between "
1708 "2 and %d - setting to %d.\n", cmds_max
,
1709 ISCSI_MGMT_ITT_OFFSET
, ISCSI_DEF_XMIT_CMDS_MAX
);
1710 cmds_max
= ISCSI_DEF_XMIT_CMDS_MAX
;
1713 shost
= scsi_host_alloc(iscsit
->host_template
,
1714 hostdata_privsize(sizeof(*session
)));
1718 /* the iscsi layer takes one task for reserve */
1719 shost
->can_queue
= cmds_max
- 1;
1720 shost
->cmd_per_lun
= qdepth
;
1722 shost
->max_channel
= 0;
1723 shost
->max_lun
= iscsit
->max_lun
;
1724 shost
->max_cmd_len
= iscsit
->max_cmd_len
;
1725 shost
->transportt
= scsit
;
1726 shost
->transportt
->create_work_queue
= 1;
1727 shost
->transportt
->eh_timed_out
= iscsi_eh_cmd_timed_out
;
1728 *hostno
= shost
->host_no
;
1730 session
= iscsi_hostdata(shost
->hostdata
);
1731 memset(session
, 0, sizeof(struct iscsi_session
));
1732 session
->host
= shost
;
1733 session
->state
= ISCSI_STATE_FREE
;
1734 session
->fast_abort
= 1;
1735 session
->lu_reset_timeout
= 15;
1736 session
->abort_timeout
= 10;
1737 session
->mgmtpool_max
= ISCSI_MGMT_CMDS_MAX
;
1738 session
->cmds_max
= cmds_max
;
1739 session
->queued_cmdsn
= session
->cmdsn
= initial_cmdsn
;
1740 session
->exp_cmdsn
= initial_cmdsn
+ 1;
1741 session
->max_cmdsn
= initial_cmdsn
+ 1;
1742 session
->max_r2t
= 1;
1743 session
->tt
= iscsit
;
1744 mutex_init(&session
->eh_mutex
);
1746 /* initialize SCSI PDU commands pool */
1747 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
1748 (void***)&session
->cmds
,
1749 cmd_task_size
+ sizeof(struct iscsi_cmd_task
)))
1750 goto cmdpool_alloc_fail
;
1752 /* pre-format cmds pool with ITT */
1753 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
1754 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
1757 ctask
->dd_data
= &ctask
[1];
1759 INIT_LIST_HEAD(&ctask
->running
);
1762 spin_lock_init(&session
->lock
);
1764 /* initialize immediate command pool */
1765 if (iscsi_pool_init(&session
->mgmtpool
, session
->mgmtpool_max
,
1766 (void***)&session
->mgmt_cmds
,
1767 mgmt_task_size
+ sizeof(struct iscsi_mgmt_task
)))
1768 goto mgmtpool_alloc_fail
;
1771 /* pre-format immediate cmds pool with ITT */
1772 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++) {
1773 struct iscsi_mgmt_task
*mtask
= session
->mgmt_cmds
[cmd_i
];
1776 mtask
->dd_data
= &mtask
[1];
1777 mtask
->itt
= ISCSI_MGMT_ITT_OFFSET
+ cmd_i
;
1778 INIT_LIST_HEAD(&mtask
->running
);
1781 if (scsi_add_host(shost
, NULL
))
1784 if (!try_module_get(iscsit
->owner
))
1785 goto cls_session_fail
;
1787 cls_session
= iscsi_create_session(shost
, iscsit
, 0);
1790 *(unsigned long*)shost
->hostdata
= (unsigned long)cls_session
;
1795 module_put(iscsit
->owner
);
1797 scsi_remove_host(shost
);
1799 iscsi_pool_free(&session
->mgmtpool
);
1800 mgmtpool_alloc_fail
:
1801 iscsi_pool_free(&session
->cmdpool
);
1803 scsi_host_put(shost
);
1806 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
1809 * iscsi_session_teardown - destroy session, host, and cls_session
1812 * This can be used by software iscsi_transports that allocate
1813 * a session per scsi host.
1815 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
1817 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1818 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1819 struct module
*owner
= cls_session
->transport
->owner
;
1821 iscsi_remove_session(cls_session
);
1822 scsi_remove_host(shost
);
1824 iscsi_pool_free(&session
->mgmtpool
);
1825 iscsi_pool_free(&session
->cmdpool
);
1827 kfree(session
->password
);
1828 kfree(session
->password_in
);
1829 kfree(session
->username
);
1830 kfree(session
->username_in
);
1831 kfree(session
->targetname
);
1832 kfree(session
->netdev
);
1833 kfree(session
->hwaddress
);
1834 kfree(session
->initiatorname
);
1836 iscsi_free_session(cls_session
);
1837 scsi_host_put(shost
);
1840 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
1843 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1844 * @cls_session: iscsi_cls_session
1847 struct iscsi_cls_conn
*
1848 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, uint32_t conn_idx
)
1850 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1851 struct iscsi_conn
*conn
;
1852 struct iscsi_cls_conn
*cls_conn
;
1855 cls_conn
= iscsi_create_conn(cls_session
, conn_idx
);
1858 conn
= cls_conn
->dd_data
;
1859 memset(conn
, 0, sizeof(*conn
));
1861 conn
->session
= session
;
1862 conn
->cls_conn
= cls_conn
;
1863 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
1864 conn
->id
= conn_idx
;
1865 conn
->exp_statsn
= 0;
1866 conn
->tmf_state
= TMF_INITIAL
;
1868 init_timer(&conn
->transport_timer
);
1869 conn
->transport_timer
.data
= (unsigned long)conn
;
1870 conn
->transport_timer
.function
= iscsi_check_transport_timeouts
;
1872 INIT_LIST_HEAD(&conn
->run_list
);
1873 INIT_LIST_HEAD(&conn
->mgmt_run_list
);
1874 INIT_LIST_HEAD(&conn
->mgmtqueue
);
1875 INIT_LIST_HEAD(&conn
->xmitqueue
);
1876 INIT_LIST_HEAD(&conn
->requeue
);
1877 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
1879 /* allocate login_mtask used for the login/text sequences */
1880 spin_lock_bh(&session
->lock
);
1881 if (!__kfifo_get(session
->mgmtpool
.queue
,
1882 (void*)&conn
->login_mtask
,
1884 spin_unlock_bh(&session
->lock
);
1885 goto login_mtask_alloc_fail
;
1887 spin_unlock_bh(&session
->lock
);
1889 data
= kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN
, GFP_KERNEL
);
1891 goto login_mtask_data_alloc_fail
;
1892 conn
->login_mtask
->data
= conn
->data
= data
;
1894 init_timer(&conn
->tmf_timer
);
1895 init_waitqueue_head(&conn
->ehwait
);
1899 login_mtask_data_alloc_fail
:
1900 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1902 login_mtask_alloc_fail
:
1903 iscsi_destroy_conn(cls_conn
);
1906 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
1909 * iscsi_conn_teardown - teardown iscsi connection
1910 * cls_conn: iscsi class connection
1912 * TODO: we may need to make this into a two step process
1913 * like scsi-mls remove + put host
1915 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
1917 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1918 struct iscsi_session
*session
= conn
->session
;
1919 unsigned long flags
;
1921 del_timer_sync(&conn
->transport_timer
);
1923 spin_lock_bh(&session
->lock
);
1924 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
1925 if (session
->leadconn
== conn
) {
1927 * leading connection? then give up on recovery.
1929 session
->state
= ISCSI_STATE_TERMINATE
;
1930 wake_up(&conn
->ehwait
);
1932 spin_unlock_bh(&session
->lock
);
1935 * Block until all in-progress commands for this connection
1939 spin_lock_irqsave(session
->host
->host_lock
, flags
);
1940 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
1941 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1944 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1945 msleep_interruptible(500);
1946 printk(KERN_INFO
"iscsi: scsi conn_destroy(): host_busy %d "
1947 "host_failed %d\n", session
->host
->host_busy
,
1948 session
->host
->host_failed
);
1950 * force eh_abort() to unblock
1952 wake_up(&conn
->ehwait
);
1955 /* flush queued up work because we free the connection below */
1956 iscsi_suspend_tx(conn
);
1958 spin_lock_bh(&session
->lock
);
1960 kfree(conn
->persistent_address
);
1961 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1963 if (session
->leadconn
== conn
)
1964 session
->leadconn
= NULL
;
1965 spin_unlock_bh(&session
->lock
);
1967 iscsi_destroy_conn(cls_conn
);
1969 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
1971 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
1973 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1974 struct iscsi_session
*session
= conn
->session
;
1977 printk(KERN_ERR
"iscsi: can't start unbound connection\n");
1981 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
1982 session
->first_burst
> session
->max_burst
) {
1983 printk("iscsi: invalid burst lengths: "
1984 "first_burst %d max_burst %d\n",
1985 session
->first_burst
, session
->max_burst
);
1989 if (conn
->ping_timeout
&& !conn
->recv_timeout
) {
1990 printk(KERN_ERR
"iscsi: invalid recv timeout of zero "
1991 "Using 5 seconds\n.");
1992 conn
->recv_timeout
= 5;
1995 if (conn
->recv_timeout
&& !conn
->ping_timeout
) {
1996 printk(KERN_ERR
"iscsi: invalid ping timeout of zero "
1997 "Using 5 seconds.\n");
1998 conn
->ping_timeout
= 5;
2001 spin_lock_bh(&session
->lock
);
2002 conn
->c_stage
= ISCSI_CONN_STARTED
;
2003 session
->state
= ISCSI_STATE_LOGGED_IN
;
2004 session
->queued_cmdsn
= session
->cmdsn
;
2006 conn
->last_recv
= jiffies
;
2007 conn
->last_ping
= jiffies
;
2008 if (conn
->recv_timeout
&& conn
->ping_timeout
)
2009 mod_timer(&conn
->transport_timer
,
2010 jiffies
+ (conn
->recv_timeout
* HZ
));
2012 switch(conn
->stop_stage
) {
2013 case STOP_CONN_RECOVER
:
2015 * unblock eh_abort() if it is blocked. re-try all
2016 * commands after successful recovery
2018 conn
->stop_stage
= 0;
2019 conn
->tmf_state
= TMF_INITIAL
;
2021 spin_unlock_bh(&session
->lock
);
2023 iscsi_unblock_session(session_to_cls(session
));
2024 wake_up(&conn
->ehwait
);
2026 case STOP_CONN_TERM
:
2027 conn
->stop_stage
= 0;
2032 spin_unlock_bh(&session
->lock
);
2036 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
2039 flush_control_queues(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
2041 struct iscsi_mgmt_task
*mtask
, *tmp
;
2043 /* handle pending */
2044 list_for_each_entry_safe(mtask
, tmp
, &conn
->mgmtqueue
, running
) {
2045 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask
->itt
);
2046 iscsi_free_mgmt_task(conn
, mtask
);
2049 /* handle running */
2050 list_for_each_entry_safe(mtask
, tmp
, &conn
->mgmt_run_list
, running
) {
2051 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask
->itt
);
2052 iscsi_free_mgmt_task(conn
, mtask
);
2058 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
2059 struct iscsi_conn
*conn
, int flag
)
2063 del_timer_sync(&conn
->transport_timer
);
2065 mutex_lock(&session
->eh_mutex
);
2066 spin_lock_bh(&session
->lock
);
2067 if (conn
->stop_stage
== STOP_CONN_TERM
) {
2068 spin_unlock_bh(&session
->lock
);
2069 mutex_unlock(&session
->eh_mutex
);
2074 * The LLD either freed/unset the lock on us, or userspace called
2075 * stop but did not create a proper connection (connection was never
2076 * bound or it was unbound then stop was called).
2078 if (!conn
->recv_lock
) {
2079 spin_unlock_bh(&session
->lock
);
2080 mutex_unlock(&session
->eh_mutex
);
2085 * When this is called for the in_login state, we only want to clean
2086 * up the login task and connection. We do not need to block and set
2087 * the recovery state again
2089 if (flag
== STOP_CONN_TERM
)
2090 session
->state
= ISCSI_STATE_TERMINATE
;
2091 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
2092 session
->state
= ISCSI_STATE_IN_RECOVERY
;
2094 old_stop_stage
= conn
->stop_stage
;
2095 conn
->stop_stage
= flag
;
2096 conn
->c_stage
= ISCSI_CONN_STOPPED
;
2097 spin_unlock_bh(&session
->lock
);
2099 iscsi_suspend_tx(conn
);
2101 write_lock_bh(conn
->recv_lock
);
2102 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
2103 write_unlock_bh(conn
->recv_lock
);
2106 * for connection level recovery we should not calculate
2107 * header digest. conn->hdr_size used for optimization
2108 * in hdr_extract() and will be re-negotiated at
2111 if (flag
== STOP_CONN_RECOVER
) {
2112 conn
->hdrdgst_en
= 0;
2113 conn
->datadgst_en
= 0;
2114 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
2115 old_stop_stage
!= STOP_CONN_RECOVER
) {
2116 debug_scsi("blocking session\n");
2117 iscsi_block_session(session_to_cls(session
));
2124 spin_lock_bh(&session
->lock
);
2125 fail_all_commands(conn
, -1);
2126 flush_control_queues(session
, conn
);
2127 spin_unlock_bh(&session
->lock
);
2128 mutex_unlock(&session
->eh_mutex
);
2131 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
2133 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2134 struct iscsi_session
*session
= conn
->session
;
2137 case STOP_CONN_RECOVER
:
2138 case STOP_CONN_TERM
:
2139 iscsi_start_session_recovery(session
, conn
, flag
);
2142 printk(KERN_ERR
"iscsi: invalid stop flag %d\n", flag
);
2145 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
2147 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
2148 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
2150 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
2151 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2153 spin_lock_bh(&session
->lock
);
2155 session
->leadconn
= conn
;
2156 spin_unlock_bh(&session
->lock
);
2159 * Unblock xmitworker(), Login Phase will pass through.
2161 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
2162 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
2165 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
2168 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
2169 enum iscsi_param param
, char *buf
, int buflen
)
2171 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2172 struct iscsi_session
*session
= conn
->session
;
2176 case ISCSI_PARAM_FAST_ABORT
:
2177 sscanf(buf
, "%d", &session
->fast_abort
);
2179 case ISCSI_PARAM_ABORT_TMO
:
2180 sscanf(buf
, "%d", &session
->abort_timeout
);
2182 case ISCSI_PARAM_LU_RESET_TMO
:
2183 sscanf(buf
, "%d", &session
->lu_reset_timeout
);
2185 case ISCSI_PARAM_PING_TMO
:
2186 sscanf(buf
, "%d", &conn
->ping_timeout
);
2188 case ISCSI_PARAM_RECV_TMO
:
2189 sscanf(buf
, "%d", &conn
->recv_timeout
);
2191 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2192 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
2194 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2195 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
2197 case ISCSI_PARAM_HDRDGST_EN
:
2198 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
2200 case ISCSI_PARAM_DATADGST_EN
:
2201 sscanf(buf
, "%d", &conn
->datadgst_en
);
2203 case ISCSI_PARAM_INITIAL_R2T_EN
:
2204 sscanf(buf
, "%d", &session
->initial_r2t_en
);
2206 case ISCSI_PARAM_MAX_R2T
:
2207 sscanf(buf
, "%d", &session
->max_r2t
);
2209 case ISCSI_PARAM_IMM_DATA_EN
:
2210 sscanf(buf
, "%d", &session
->imm_data_en
);
2212 case ISCSI_PARAM_FIRST_BURST
:
2213 sscanf(buf
, "%d", &session
->first_burst
);
2215 case ISCSI_PARAM_MAX_BURST
:
2216 sscanf(buf
, "%d", &session
->max_burst
);
2218 case ISCSI_PARAM_PDU_INORDER_EN
:
2219 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
2221 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2222 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
2224 case ISCSI_PARAM_ERL
:
2225 sscanf(buf
, "%d", &session
->erl
);
2227 case ISCSI_PARAM_IFMARKER_EN
:
2228 sscanf(buf
, "%d", &value
);
2231 case ISCSI_PARAM_OFMARKER_EN
:
2232 sscanf(buf
, "%d", &value
);
2235 case ISCSI_PARAM_EXP_STATSN
:
2236 sscanf(buf
, "%u", &conn
->exp_statsn
);
2238 case ISCSI_PARAM_USERNAME
:
2239 kfree(session
->username
);
2240 session
->username
= kstrdup(buf
, GFP_KERNEL
);
2241 if (!session
->username
)
2244 case ISCSI_PARAM_USERNAME_IN
:
2245 kfree(session
->username_in
);
2246 session
->username_in
= kstrdup(buf
, GFP_KERNEL
);
2247 if (!session
->username_in
)
2250 case ISCSI_PARAM_PASSWORD
:
2251 kfree(session
->password
);
2252 session
->password
= kstrdup(buf
, GFP_KERNEL
);
2253 if (!session
->password
)
2256 case ISCSI_PARAM_PASSWORD_IN
:
2257 kfree(session
->password_in
);
2258 session
->password_in
= kstrdup(buf
, GFP_KERNEL
);
2259 if (!session
->password_in
)
2262 case ISCSI_PARAM_TARGET_NAME
:
2263 /* this should not change between logins */
2264 if (session
->targetname
)
2267 session
->targetname
= kstrdup(buf
, GFP_KERNEL
);
2268 if (!session
->targetname
)
2271 case ISCSI_PARAM_TPGT
:
2272 sscanf(buf
, "%d", &session
->tpgt
);
2274 case ISCSI_PARAM_PERSISTENT_PORT
:
2275 sscanf(buf
, "%d", &conn
->persistent_port
);
2277 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2279 * this is the address returned in discovery so it should
2280 * not change between logins.
2282 if (conn
->persistent_address
)
2285 conn
->persistent_address
= kstrdup(buf
, GFP_KERNEL
);
2286 if (!conn
->persistent_address
)
2295 EXPORT_SYMBOL_GPL(iscsi_set_param
);
2297 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
2298 enum iscsi_param param
, char *buf
)
2300 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
2301 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2305 case ISCSI_PARAM_FAST_ABORT
:
2306 len
= sprintf(buf
, "%d\n", session
->fast_abort
);
2308 case ISCSI_PARAM_ABORT_TMO
:
2309 len
= sprintf(buf
, "%d\n", session
->abort_timeout
);
2311 case ISCSI_PARAM_LU_RESET_TMO
:
2312 len
= sprintf(buf
, "%d\n", session
->lu_reset_timeout
);
2314 case ISCSI_PARAM_INITIAL_R2T_EN
:
2315 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
2317 case ISCSI_PARAM_MAX_R2T
:
2318 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
2320 case ISCSI_PARAM_IMM_DATA_EN
:
2321 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
2323 case ISCSI_PARAM_FIRST_BURST
:
2324 len
= sprintf(buf
, "%u\n", session
->first_burst
);
2326 case ISCSI_PARAM_MAX_BURST
:
2327 len
= sprintf(buf
, "%u\n", session
->max_burst
);
2329 case ISCSI_PARAM_PDU_INORDER_EN
:
2330 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
2332 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2333 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
2335 case ISCSI_PARAM_ERL
:
2336 len
= sprintf(buf
, "%d\n", session
->erl
);
2338 case ISCSI_PARAM_TARGET_NAME
:
2339 len
= sprintf(buf
, "%s\n", session
->targetname
);
2341 case ISCSI_PARAM_TPGT
:
2342 len
= sprintf(buf
, "%d\n", session
->tpgt
);
2344 case ISCSI_PARAM_USERNAME
:
2345 len
= sprintf(buf
, "%s\n", session
->username
);
2347 case ISCSI_PARAM_USERNAME_IN
:
2348 len
= sprintf(buf
, "%s\n", session
->username_in
);
2350 case ISCSI_PARAM_PASSWORD
:
2351 len
= sprintf(buf
, "%s\n", session
->password
);
2353 case ISCSI_PARAM_PASSWORD_IN
:
2354 len
= sprintf(buf
, "%s\n", session
->password_in
);
2362 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
2364 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
2365 enum iscsi_param param
, char *buf
)
2367 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2371 case ISCSI_PARAM_PING_TMO
:
2372 len
= sprintf(buf
, "%u\n", conn
->ping_timeout
);
2374 case ISCSI_PARAM_RECV_TMO
:
2375 len
= sprintf(buf
, "%u\n", conn
->recv_timeout
);
2377 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2378 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
2380 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2381 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
2383 case ISCSI_PARAM_HDRDGST_EN
:
2384 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
2386 case ISCSI_PARAM_DATADGST_EN
:
2387 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
2389 case ISCSI_PARAM_IFMARKER_EN
:
2390 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
2392 case ISCSI_PARAM_OFMARKER_EN
:
2393 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
2395 case ISCSI_PARAM_EXP_STATSN
:
2396 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
2398 case ISCSI_PARAM_PERSISTENT_PORT
:
2399 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
2401 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2402 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
2410 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
2412 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2415 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2419 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2420 if (!session
->netdev
)
2421 len
= sprintf(buf
, "%s\n", "default");
2423 len
= sprintf(buf
, "%s\n", session
->netdev
);
2425 case ISCSI_HOST_PARAM_HWADDRESS
:
2426 if (!session
->hwaddress
)
2427 len
= sprintf(buf
, "%s\n", "default");
2429 len
= sprintf(buf
, "%s\n", session
->hwaddress
);
2431 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2432 if (!session
->initiatorname
)
2433 len
= sprintf(buf
, "%s\n", "unknown");
2435 len
= sprintf(buf
, "%s\n", session
->initiatorname
);
2444 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
2446 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2447 char *buf
, int buflen
)
2449 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2452 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2453 if (!session
->netdev
)
2454 session
->netdev
= kstrdup(buf
, GFP_KERNEL
);
2456 case ISCSI_HOST_PARAM_HWADDRESS
:
2457 if (!session
->hwaddress
)
2458 session
->hwaddress
= kstrdup(buf
, GFP_KERNEL
);
2460 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2461 if (!session
->initiatorname
)
2462 session
->initiatorname
= kstrdup(buf
, GFP_KERNEL
);
2470 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
2472 MODULE_AUTHOR("Mike Christie");
2473 MODULE_DESCRIPTION("iSCSI library functions");
2474 MODULE_LICENSE("GPL");