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 iscsi_conn_printk(KERN_ERR
, conn
,
420 "Got CHECK_CONDITION but invalid data "
421 "buffer size of %d\n", datalen
);
422 sc
->result
= DID_BAD_TARGET
<< 16;
426 senselen
= be16_to_cpu(get_unaligned((__be16
*) data
));
427 if (datalen
< senselen
)
428 goto invalid_datalen
;
430 memcpy(sc
->sense_buffer
, data
+ 2,
431 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
432 debug_scsi("copied %d bytes of sense\n",
433 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
436 if (rhdr
->flags
& (ISCSI_FLAG_CMD_UNDERFLOW
|
437 ISCSI_FLAG_CMD_OVERFLOW
)) {
438 int res_count
= be32_to_cpu(rhdr
->residual_count
);
441 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
442 res_count
<= scsi_bufflen(sc
)))
443 scsi_set_resid(sc
, res_count
);
445 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
446 } else if (rhdr
->flags
& (ISCSI_FLAG_CMD_BIDI_UNDERFLOW
|
447 ISCSI_FLAG_CMD_BIDI_OVERFLOW
))
448 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
451 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
452 (long)sc
, sc
->result
, ctask
->itt
);
453 conn
->scsirsp_pdus_cnt
++;
455 __iscsi_put_ctask(ctask
);
458 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
460 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
462 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
463 conn
->tmfrsp_pdus_cnt
++;
465 if (conn
->tmf_state
!= TMF_QUEUED
)
468 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
469 conn
->tmf_state
= TMF_SUCCESS
;
470 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
471 conn
->tmf_state
= TMF_NOT_FOUND
;
473 conn
->tmf_state
= TMF_FAILED
;
474 wake_up(&conn
->ehwait
);
477 static void iscsi_send_nopout(struct iscsi_conn
*conn
, struct iscsi_nopin
*rhdr
)
479 struct iscsi_nopout hdr
;
480 struct iscsi_mgmt_task
*mtask
;
482 if (!rhdr
&& conn
->ping_mtask
)
485 memset(&hdr
, 0, sizeof(struct iscsi_nopout
));
486 hdr
.opcode
= ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
;
487 hdr
.flags
= ISCSI_FLAG_CMD_FINAL
;
490 memcpy(hdr
.lun
, rhdr
->lun
, 8);
492 hdr
.itt
= RESERVED_ITT
;
494 hdr
.ttt
= RESERVED_ITT
;
496 mtask
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)&hdr
, NULL
, 0);
498 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send nopout\n");
502 /* only track our nops */
504 conn
->ping_mtask
= mtask
;
505 conn
->last_ping
= jiffies
;
507 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
510 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
511 char *data
, int datalen
)
513 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
514 struct iscsi_hdr rejected_pdu
;
517 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
519 if (reject
->reason
== ISCSI_REASON_DATA_DIGEST_ERROR
) {
520 if (ntoh24(reject
->dlength
) > datalen
)
521 return ISCSI_ERR_PROTO
;
523 if (ntoh24(reject
->dlength
) >= sizeof(struct iscsi_hdr
)) {
524 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
525 itt
= get_itt(rejected_pdu
.itt
);
526 iscsi_conn_printk(KERN_ERR
, conn
,
527 "itt 0x%x had pdu (op 0x%x) rejected "
528 "due to DataDigest error.\n", itt
,
529 rejected_pdu
.opcode
);
536 * __iscsi_complete_pdu - complete pdu
540 * @datalen: len of data buffer
542 * Completes pdu processing by freeing any resources allocated at
543 * queuecommand or send generic. session lock must be held and verify
544 * itt must have been called.
546 static int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
547 char *data
, int datalen
)
549 struct iscsi_session
*session
= conn
->session
;
550 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
551 struct iscsi_cmd_task
*ctask
;
552 struct iscsi_mgmt_task
*mtask
;
555 conn
->last_recv
= jiffies
;
556 if (hdr
->itt
!= RESERVED_ITT
)
557 itt
= get_itt(hdr
->itt
);
561 if (itt
< session
->cmds_max
) {
562 ctask
= session
->cmds
[itt
];
564 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
565 opcode
, conn
->id
, ctask
->itt
, datalen
);
568 case ISCSI_OP_SCSI_CMD_RSP
:
569 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
570 iscsi_scsi_cmd_rsp(conn
, hdr
, ctask
, data
,
573 case ISCSI_OP_SCSI_DATA_IN
:
574 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
575 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
576 conn
->scsirsp_pdus_cnt
++;
577 __iscsi_put_ctask(ctask
);
581 /* LLD handles this for now */
584 rc
= ISCSI_ERR_BAD_OPCODE
;
587 } else if (itt
>= ISCSI_MGMT_ITT_OFFSET
&&
588 itt
< ISCSI_MGMT_ITT_OFFSET
+ session
->mgmtpool_max
) {
589 mtask
= session
->mgmt_cmds
[itt
- ISCSI_MGMT_ITT_OFFSET
];
591 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
592 opcode
, conn
->id
, mtask
->itt
, datalen
);
594 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
596 case ISCSI_OP_LOGOUT_RSP
:
598 rc
= ISCSI_ERR_PROTO
;
601 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
603 case ISCSI_OP_LOGIN_RSP
:
604 case ISCSI_OP_TEXT_RSP
:
606 * login related PDU's exp_statsn is handled in
609 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
610 rc
= ISCSI_ERR_CONN_FAILED
;
611 iscsi_free_mgmt_task(conn
, mtask
);
613 case ISCSI_OP_SCSI_TMFUNC_RSP
:
615 rc
= ISCSI_ERR_PROTO
;
619 iscsi_tmf_rsp(conn
, hdr
);
620 iscsi_free_mgmt_task(conn
, mtask
);
622 case ISCSI_OP_NOOP_IN
:
623 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) ||
625 rc
= ISCSI_ERR_PROTO
;
628 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
630 if (conn
->ping_mtask
!= mtask
) {
632 * If this is not in response to one of our
633 * nops then it must be from userspace.
635 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
,
637 rc
= ISCSI_ERR_CONN_FAILED
;
639 iscsi_free_mgmt_task(conn
, mtask
);
642 rc
= ISCSI_ERR_BAD_OPCODE
;
645 } else if (itt
== ~0U) {
646 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
649 case ISCSI_OP_NOOP_IN
:
651 rc
= ISCSI_ERR_PROTO
;
655 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
658 iscsi_send_nopout(conn
, (struct iscsi_nopin
*)hdr
);
660 case ISCSI_OP_REJECT
:
661 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
663 case ISCSI_OP_ASYNC_EVENT
:
664 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
665 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
666 rc
= ISCSI_ERR_CONN_FAILED
;
669 rc
= ISCSI_ERR_BAD_OPCODE
;
673 rc
= ISCSI_ERR_BAD_ITT
;
678 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
679 char *data
, int datalen
)
683 spin_lock(&conn
->session
->lock
);
684 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
685 spin_unlock(&conn
->session
->lock
);
688 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
690 /* verify itt (itt encoding: age+cid+itt) */
691 int iscsi_verify_itt(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
694 struct iscsi_session
*session
= conn
->session
;
695 struct iscsi_cmd_task
*ctask
;
698 if (hdr
->itt
!= RESERVED_ITT
) {
699 if (((__force u32
)hdr
->itt
& ISCSI_AGE_MASK
) !=
700 (session
->age
<< ISCSI_AGE_SHIFT
)) {
701 iscsi_conn_printk(KERN_ERR
, conn
,
702 "received itt %x expected session "
703 "age (%x)\n", (__force u32
)hdr
->itt
,
704 session
->age
& ISCSI_AGE_MASK
);
705 return ISCSI_ERR_BAD_ITT
;
708 if (((__force u32
)hdr
->itt
& ISCSI_CID_MASK
) !=
709 (conn
->id
<< ISCSI_CID_SHIFT
)) {
710 iscsi_conn_printk(KERN_ERR
, conn
,
711 "iscsi: received itt %x, expected "
713 (__force u32
)hdr
->itt
, conn
->id
);
714 return ISCSI_ERR_BAD_ITT
;
716 itt
= get_itt(hdr
->itt
);
720 if (itt
< session
->cmds_max
) {
721 ctask
= session
->cmds
[itt
];
724 iscsi_conn_printk(KERN_INFO
, conn
, "dropping ctask "
725 "with itt 0x%x\n", ctask
->itt
);
727 return ISCSI_ERR_NO_SCSI_CMD
;
730 if (ctask
->sc
->SCp
.phase
!= session
->age
) {
731 iscsi_conn_printk(KERN_ERR
, conn
,
732 "iscsi: ctask's session age %d, "
733 "expected %d\n", ctask
->sc
->SCp
.phase
,
735 return ISCSI_ERR_SESSION_FAILED
;
742 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
744 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
746 struct iscsi_session
*session
= conn
->session
;
749 spin_lock_irqsave(&session
->lock
, flags
);
750 if (session
->state
== ISCSI_STATE_FAILED
) {
751 spin_unlock_irqrestore(&session
->lock
, flags
);
755 if (conn
->stop_stage
== 0)
756 session
->state
= ISCSI_STATE_FAILED
;
757 spin_unlock_irqrestore(&session
->lock
, flags
);
758 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
759 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
760 iscsi_conn_error(conn
->cls_conn
, err
);
762 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
764 static void iscsi_prep_mtask(struct iscsi_conn
*conn
,
765 struct iscsi_mgmt_task
*mtask
)
767 struct iscsi_session
*session
= conn
->session
;
768 struct iscsi_hdr
*hdr
= mtask
->hdr
;
769 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
771 if (hdr
->opcode
!= (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) &&
772 hdr
->opcode
!= (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
773 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
775 * pre-format CmdSN for outgoing PDU.
777 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
778 if (hdr
->itt
!= RESERVED_ITT
) {
779 hdr
->itt
= build_itt(mtask
->itt
, conn
->id
, session
->age
);
781 * TODO: We always use immediate, so we never hit this.
782 * If we start to send tmfs or nops as non-immediate then
783 * we should start checking the cmdsn numbers for mgmt tasks.
785 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
786 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
787 session
->queued_cmdsn
++;
792 if (session
->tt
->init_mgmt_task
)
793 session
->tt
->init_mgmt_task(conn
, mtask
);
795 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
796 hdr
->opcode
& ISCSI_OPCODE_MASK
, hdr
->itt
,
800 static int iscsi_xmit_mtask(struct iscsi_conn
*conn
)
802 struct iscsi_hdr
*hdr
= conn
->mtask
->hdr
;
805 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
)
806 conn
->session
->state
= ISCSI_STATE_LOGGING_OUT
;
807 spin_unlock_bh(&conn
->session
->lock
);
809 rc
= conn
->session
->tt
->xmit_mgmt_task(conn
, conn
->mtask
);
810 spin_lock_bh(&conn
->session
->lock
);
814 /* done with this in-progress mtask */
819 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn
*conn
)
821 struct iscsi_session
*session
= conn
->session
;
824 * Check for iSCSI window and take care of CmdSN wrap-around
826 if (!iscsi_sna_lte(session
->queued_cmdsn
, session
->max_cmdsn
)) {
827 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
828 "CmdSN %u/%u\n", session
->exp_cmdsn
,
829 session
->max_cmdsn
, session
->cmdsn
,
830 session
->queued_cmdsn
);
836 static int iscsi_xmit_ctask(struct iscsi_conn
*conn
)
838 struct iscsi_cmd_task
*ctask
= conn
->ctask
;
841 __iscsi_get_ctask(ctask
);
842 spin_unlock_bh(&conn
->session
->lock
);
843 rc
= conn
->session
->tt
->xmit_cmd_task(conn
, ctask
);
844 spin_lock_bh(&conn
->session
->lock
);
845 __iscsi_put_ctask(ctask
);
847 /* done with this ctask */
853 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
854 * @ctask: ctask to requeue
856 * LLDs that need to run a ctask from the session workqueue should call
857 * this. The session lock must be held.
859 void iscsi_requeue_ctask(struct iscsi_cmd_task
*ctask
)
861 struct iscsi_conn
*conn
= ctask
->conn
;
863 list_move_tail(&ctask
->running
, &conn
->requeue
);
864 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
866 EXPORT_SYMBOL_GPL(iscsi_requeue_ctask
);
869 * iscsi_data_xmit - xmit any command into the scheduled connection
870 * @conn: iscsi connection
873 * The function can return -EAGAIN in which case the caller must
874 * re-schedule it again later or recover. '0' return code means
877 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
881 spin_lock_bh(&conn
->session
->lock
);
882 if (unlikely(conn
->suspend_tx
)) {
883 debug_scsi("conn %d Tx suspended!\n", conn
->id
);
884 spin_unlock_bh(&conn
->session
->lock
);
889 rc
= iscsi_xmit_ctask(conn
);
895 rc
= iscsi_xmit_mtask(conn
);
901 * process mgmt pdus like nops before commands since we should
902 * only have one nop-out as a ping from us and targets should not
903 * overflow us with nop-ins
906 while (!list_empty(&conn
->mgmtqueue
)) {
907 conn
->mtask
= list_entry(conn
->mgmtqueue
.next
,
908 struct iscsi_mgmt_task
, running
);
909 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
910 iscsi_free_mgmt_task(conn
, conn
->mtask
);
915 iscsi_prep_mtask(conn
, conn
->mtask
);
916 list_move_tail(conn
->mgmtqueue
.next
, &conn
->mgmt_run_list
);
917 rc
= iscsi_xmit_mtask(conn
);
922 /* process pending command queue */
923 while (!list_empty(&conn
->xmitqueue
)) {
924 if (conn
->tmf_state
== TMF_QUEUED
)
927 conn
->ctask
= list_entry(conn
->xmitqueue
.next
,
928 struct iscsi_cmd_task
, running
);
929 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
930 fail_command(conn
, conn
->ctask
, DID_IMM_RETRY
<< 16);
933 if (iscsi_prep_scsi_cmd_pdu(conn
->ctask
)) {
934 fail_command(conn
, conn
->ctask
, DID_ABORT
<< 16);
938 conn
->ctask
->state
= ISCSI_TASK_RUNNING
;
939 list_move_tail(conn
->xmitqueue
.next
, &conn
->run_list
);
940 rc
= iscsi_xmit_ctask(conn
);
944 * we could continuously get new ctask requests so
945 * we need to check the mgmt queue for nops that need to
946 * be sent to aviod starvation
948 if (!list_empty(&conn
->mgmtqueue
))
952 while (!list_empty(&conn
->requeue
)) {
953 if (conn
->session
->fast_abort
&& conn
->tmf_state
!= TMF_INITIAL
)
957 * we always do fastlogout - conn stop code will clean up.
959 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
962 conn
->ctask
= list_entry(conn
->requeue
.next
,
963 struct iscsi_cmd_task
, running
);
964 conn
->ctask
->state
= ISCSI_TASK_RUNNING
;
965 list_move_tail(conn
->requeue
.next
, &conn
->run_list
);
966 rc
= iscsi_xmit_ctask(conn
);
969 if (!list_empty(&conn
->mgmtqueue
))
972 spin_unlock_bh(&conn
->session
->lock
);
976 if (unlikely(conn
->suspend_tx
))
978 spin_unlock_bh(&conn
->session
->lock
);
982 static void iscsi_xmitworker(struct work_struct
*work
)
984 struct iscsi_conn
*conn
=
985 container_of(work
, struct iscsi_conn
, xmitwork
);
988 * serialize Xmit worker on a per-connection basis.
991 rc
= iscsi_data_xmit(conn
);
992 } while (rc
>= 0 || rc
== -EAGAIN
);
996 FAILURE_BAD_HOST
= 1,
997 FAILURE_SESSION_FAILED
,
998 FAILURE_SESSION_FREED
,
999 FAILURE_WINDOW_CLOSED
,
1001 FAILURE_SESSION_TERMINATE
,
1002 FAILURE_SESSION_IN_RECOVERY
,
1003 FAILURE_SESSION_RECOVERY_TIMEOUT
,
1004 FAILURE_SESSION_LOGGING_OUT
,
1005 FAILURE_SESSION_NOT_READY
,
1008 int iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
1010 struct Scsi_Host
*host
;
1012 struct iscsi_session
*session
;
1013 struct iscsi_conn
*conn
;
1014 struct iscsi_cmd_task
*ctask
= NULL
;
1016 sc
->scsi_done
= done
;
1020 host
= sc
->device
->host
;
1021 spin_unlock(host
->host_lock
);
1023 session
= iscsi_hostdata(host
->hostdata
);
1024 spin_lock(&session
->lock
);
1026 reason
= iscsi_session_chkready(session_to_cls(session
));
1028 sc
->result
= reason
;
1033 * ISCSI_STATE_FAILED is a temp. state. The recovery
1034 * code will decide what is best to do with command queued
1037 if (session
->state
!= ISCSI_STATE_LOGGED_IN
&&
1038 session
->state
!= ISCSI_STATE_FAILED
) {
1040 * to handle the race between when we set the recovery state
1041 * and block the session we requeue here (commands could
1042 * be entering our queuecommand while a block is starting
1043 * up because the block code is not locked)
1045 switch (session
->state
) {
1046 case ISCSI_STATE_IN_RECOVERY
:
1047 reason
= FAILURE_SESSION_IN_RECOVERY
;
1048 sc
->result
= DID_IMM_RETRY
<< 16;
1050 case ISCSI_STATE_LOGGING_OUT
:
1051 reason
= FAILURE_SESSION_LOGGING_OUT
;
1052 sc
->result
= DID_IMM_RETRY
<< 16;
1054 case ISCSI_STATE_RECOVERY_FAILED
:
1055 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
1056 sc
->result
= DID_NO_CONNECT
<< 16;
1058 case ISCSI_STATE_TERMINATE
:
1059 reason
= FAILURE_SESSION_TERMINATE
;
1060 sc
->result
= DID_NO_CONNECT
<< 16;
1063 reason
= FAILURE_SESSION_FREED
;
1064 sc
->result
= DID_NO_CONNECT
<< 16;
1069 conn
= session
->leadconn
;
1071 reason
= FAILURE_SESSION_FREED
;
1072 sc
->result
= DID_NO_CONNECT
<< 16;
1076 if (iscsi_check_cmdsn_window_closed(conn
)) {
1077 reason
= FAILURE_WINDOW_CLOSED
;
1081 if (!__kfifo_get(session
->cmdpool
.queue
, (void*)&ctask
,
1083 reason
= FAILURE_OOM
;
1086 session
->queued_cmdsn
++;
1088 sc
->SCp
.phase
= session
->age
;
1089 sc
->SCp
.ptr
= (char *)ctask
;
1091 atomic_set(&ctask
->refcount
, 1);
1092 ctask
->state
= ISCSI_TASK_PENDING
;
1095 INIT_LIST_HEAD(&ctask
->running
);
1097 list_add_tail(&ctask
->running
, &conn
->xmitqueue
);
1098 spin_unlock(&session
->lock
);
1100 scsi_queue_work(host
, &conn
->xmitwork
);
1101 spin_lock(host
->host_lock
);
1105 spin_unlock(&session
->lock
);
1106 debug_scsi("cmd 0x%x rejected (%d)\n", sc
->cmnd
[0], reason
);
1107 spin_lock(host
->host_lock
);
1108 return SCSI_MLQUEUE_HOST_BUSY
;
1111 spin_unlock(&session
->lock
);
1112 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc
->cmnd
[0], reason
);
1113 scsi_set_resid(sc
, scsi_bufflen(sc
));
1115 spin_lock(host
->host_lock
);
1118 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
1120 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
)
1122 if (depth
> ISCSI_MAX_CMD_PER_LUN
)
1123 depth
= ISCSI_MAX_CMD_PER_LUN
;
1124 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
1125 return sdev
->queue_depth
;
1127 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
1129 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
1131 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1133 spin_lock_bh(&session
->lock
);
1134 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1135 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
1136 if (session
->leadconn
)
1137 wake_up(&session
->leadconn
->ehwait
);
1139 spin_unlock_bh(&session
->lock
);
1141 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
1143 int iscsi_eh_host_reset(struct scsi_cmnd
*sc
)
1145 struct Scsi_Host
*host
= sc
->device
->host
;
1146 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
1147 struct iscsi_conn
*conn
= session
->leadconn
;
1149 mutex_lock(&session
->eh_mutex
);
1150 spin_lock_bh(&session
->lock
);
1151 if (session
->state
== ISCSI_STATE_TERMINATE
) {
1153 debug_scsi("failing host reset: session terminated "
1154 "[CID %d age %d]\n", conn
->id
, session
->age
);
1155 spin_unlock_bh(&session
->lock
);
1156 mutex_unlock(&session
->eh_mutex
);
1160 spin_unlock_bh(&session
->lock
);
1161 mutex_unlock(&session
->eh_mutex
);
1163 * we drop the lock here but the leadconn cannot be destoyed while
1164 * we are in the scsi eh
1166 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1168 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1169 wait_event_interruptible(conn
->ehwait
,
1170 session
->state
== ISCSI_STATE_TERMINATE
||
1171 session
->state
== ISCSI_STATE_LOGGED_IN
||
1172 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
1173 if (signal_pending(current
))
1174 flush_signals(current
);
1176 mutex_lock(&session
->eh_mutex
);
1177 spin_lock_bh(&session
->lock
);
1178 if (session
->state
== ISCSI_STATE_LOGGED_IN
)
1179 iscsi_session_printk(KERN_INFO
, session
,
1180 "host reset succeeded\n");
1183 spin_unlock_bh(&session
->lock
);
1184 mutex_unlock(&session
->eh_mutex
);
1187 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset
);
1189 static void iscsi_tmf_timedout(unsigned long data
)
1191 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1192 struct iscsi_session
*session
= conn
->session
;
1194 spin_lock(&session
->lock
);
1195 if (conn
->tmf_state
== TMF_QUEUED
) {
1196 conn
->tmf_state
= TMF_TIMEDOUT
;
1197 debug_scsi("tmf timedout\n");
1198 /* unblock eh_abort() */
1199 wake_up(&conn
->ehwait
);
1201 spin_unlock(&session
->lock
);
1204 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn
*conn
,
1205 struct iscsi_tm
*hdr
, int age
,
1208 struct iscsi_session
*session
= conn
->session
;
1209 struct iscsi_mgmt_task
*mtask
;
1211 mtask
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)hdr
,
1214 spin_unlock_bh(&session
->lock
);
1215 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1216 spin_lock_bh(&session
->lock
);
1217 debug_scsi("tmf exec failure\n");
1220 conn
->tmfcmd_pdus_cnt
++;
1221 conn
->tmf_timer
.expires
= timeout
* HZ
+ jiffies
;
1222 conn
->tmf_timer
.function
= iscsi_tmf_timedout
;
1223 conn
->tmf_timer
.data
= (unsigned long)conn
;
1224 add_timer(&conn
->tmf_timer
);
1225 debug_scsi("tmf set timeout\n");
1227 spin_unlock_bh(&session
->lock
);
1228 mutex_unlock(&session
->eh_mutex
);
1229 scsi_queue_work(session
->host
, &conn
->xmitwork
);
1232 * block eh thread until:
1236 * 3) session is terminated or restarted or userspace has
1237 * given up on recovery
1239 wait_event_interruptible(conn
->ehwait
, age
!= session
->age
||
1240 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1241 conn
->tmf_state
!= TMF_QUEUED
);
1242 if (signal_pending(current
))
1243 flush_signals(current
);
1244 del_timer_sync(&conn
->tmf_timer
);
1246 mutex_lock(&session
->eh_mutex
);
1247 spin_lock_bh(&session
->lock
);
1248 /* if the session drops it will clean up the mtask */
1249 if (age
!= session
->age
||
1250 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1256 * Fail commands. session lock held and recv side suspended and xmit
1259 static void fail_all_commands(struct iscsi_conn
*conn
, unsigned lun
,
1262 struct iscsi_cmd_task
*ctask
, *tmp
;
1264 if (conn
->ctask
&& (conn
->ctask
->sc
->device
->lun
== lun
|| lun
== -1))
1268 list_for_each_entry_safe(ctask
, tmp
, &conn
->xmitqueue
, running
) {
1269 if (lun
== ctask
->sc
->device
->lun
|| lun
== -1) {
1270 debug_scsi("failing pending sc %p itt 0x%x\n",
1271 ctask
->sc
, ctask
->itt
);
1272 fail_command(conn
, ctask
, error
<< 16);
1276 list_for_each_entry_safe(ctask
, tmp
, &conn
->requeue
, running
) {
1277 if (lun
== ctask
->sc
->device
->lun
|| lun
== -1) {
1278 debug_scsi("failing requeued sc %p itt 0x%x\n",
1279 ctask
->sc
, ctask
->itt
);
1280 fail_command(conn
, ctask
, error
<< 16);
1284 /* fail all other running */
1285 list_for_each_entry_safe(ctask
, tmp
, &conn
->run_list
, running
) {
1286 if (lun
== ctask
->sc
->device
->lun
|| lun
== -1) {
1287 debug_scsi("failing in progress sc %p itt 0x%x\n",
1288 ctask
->sc
, ctask
->itt
);
1289 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1294 static void iscsi_suspend_tx(struct iscsi_conn
*conn
)
1296 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1297 scsi_flush_work(conn
->session
->host
);
1300 static void iscsi_start_tx(struct iscsi_conn
*conn
)
1302 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1303 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
1306 static enum scsi_eh_timer_return
iscsi_eh_cmd_timed_out(struct scsi_cmnd
*scmd
)
1308 struct iscsi_cls_session
*cls_session
;
1309 struct iscsi_session
*session
;
1310 struct iscsi_conn
*conn
;
1311 enum scsi_eh_timer_return rc
= EH_NOT_HANDLED
;
1313 cls_session
= starget_to_session(scsi_target(scmd
->device
));
1314 session
= class_to_transport_session(cls_session
);
1316 debug_scsi("scsi cmd %p timedout\n", scmd
);
1318 spin_lock(&session
->lock
);
1319 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1321 * We are probably in the middle of iscsi recovery so let
1322 * that complete and handle the error.
1324 rc
= EH_RESET_TIMER
;
1328 conn
= session
->leadconn
;
1330 /* In the middle of shuting down */
1331 rc
= EH_RESET_TIMER
;
1335 if (!conn
->recv_timeout
&& !conn
->ping_timeout
)
1338 * if the ping timedout then we are in the middle of cleaning up
1339 * and can let the iscsi eh handle it
1341 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
) +
1342 (conn
->ping_timeout
* HZ
), jiffies
))
1343 rc
= EH_RESET_TIMER
;
1345 * if we are about to check the transport then give the command
1348 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
),
1350 rc
= EH_RESET_TIMER
;
1351 /* if in the middle of checking the transport then give us more time */
1352 if (conn
->ping_mtask
)
1353 rc
= EH_RESET_TIMER
;
1355 spin_unlock(&session
->lock
);
1356 debug_scsi("return %s\n", rc
== EH_RESET_TIMER
? "timer reset" : "nh");
1360 static void iscsi_check_transport_timeouts(unsigned long data
)
1362 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1363 struct iscsi_session
*session
= conn
->session
;
1364 unsigned long timeout
, next_timeout
= 0, last_recv
;
1366 spin_lock(&session
->lock
);
1367 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
1370 timeout
= conn
->recv_timeout
;
1375 last_recv
= conn
->last_recv
;
1376 if (time_before_eq(last_recv
+ timeout
+ (conn
->ping_timeout
* HZ
),
1378 iscsi_conn_printk(KERN_ERR
, conn
, "ping timeout of %d secs "
1379 "expired, last rx %lu, last ping %lu, "
1380 "now %lu\n", conn
->ping_timeout
, last_recv
,
1381 conn
->last_ping
, jiffies
);
1382 spin_unlock(&session
->lock
);
1383 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1387 if (time_before_eq(last_recv
+ timeout
, jiffies
)) {
1388 if (time_before_eq(conn
->last_ping
, last_recv
)) {
1389 /* send a ping to try to provoke some traffic */
1390 debug_scsi("Sending nopout as ping on conn %p\n", conn
);
1391 iscsi_send_nopout(conn
, NULL
);
1393 next_timeout
= last_recv
+ timeout
+ (conn
->ping_timeout
* HZ
);
1395 next_timeout
= last_recv
+ timeout
;
1397 debug_scsi("Setting next tmo %lu\n", next_timeout
);
1398 mod_timer(&conn
->transport_timer
, next_timeout
);
1400 spin_unlock(&session
->lock
);
1403 static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task
*ctask
,
1404 struct iscsi_tm
*hdr
)
1406 memset(hdr
, 0, sizeof(*hdr
));
1407 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1408 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
& ISCSI_FLAG_TM_FUNC_MASK
;
1409 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1410 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
1411 hdr
->rtt
= ctask
->hdr
->itt
;
1412 hdr
->refcmdsn
= ctask
->hdr
->cmdsn
;
1415 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
1417 struct Scsi_Host
*host
= sc
->device
->host
;
1418 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
1419 struct iscsi_conn
*conn
;
1420 struct iscsi_cmd_task
*ctask
;
1421 struct iscsi_tm
*hdr
;
1424 mutex_lock(&session
->eh_mutex
);
1425 spin_lock_bh(&session
->lock
);
1427 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1431 debug_scsi("sc never reached iscsi layer or it completed.\n");
1432 spin_unlock_bh(&session
->lock
);
1433 mutex_unlock(&session
->eh_mutex
);
1438 * If we are not logged in or we have started a new session
1439 * then let the host reset code handle this
1441 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
||
1442 sc
->SCp
.phase
!= session
->age
) {
1443 spin_unlock_bh(&session
->lock
);
1444 mutex_unlock(&session
->eh_mutex
);
1448 conn
= session
->leadconn
;
1449 conn
->eh_abort_cnt
++;
1452 ctask
= (struct iscsi_cmd_task
*)sc
->SCp
.ptr
;
1453 debug_scsi("aborting [sc %p itt 0x%x]\n", sc
, ctask
->itt
);
1455 /* ctask completed before time out */
1457 debug_scsi("sc completed while abort in progress\n");
1461 if (ctask
->state
== ISCSI_TASK_PENDING
) {
1462 fail_command(conn
, ctask
, DID_ABORT
<< 16);
1466 /* only have one tmf outstanding at a time */
1467 if (conn
->tmf_state
!= TMF_INITIAL
)
1469 conn
->tmf_state
= TMF_QUEUED
;
1472 iscsi_prep_abort_task_pdu(ctask
, hdr
);
1474 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, age
, session
->abort_timeout
)) {
1479 switch (conn
->tmf_state
) {
1481 spin_unlock_bh(&session
->lock
);
1482 iscsi_suspend_tx(conn
);
1484 * clean up task if aborted. grab the recv lock as a writer
1486 write_lock_bh(conn
->recv_lock
);
1487 spin_lock(&session
->lock
);
1488 fail_command(conn
, ctask
, DID_ABORT
<< 16);
1489 conn
->tmf_state
= TMF_INITIAL
;
1490 spin_unlock(&session
->lock
);
1491 write_unlock_bh(conn
->recv_lock
);
1492 iscsi_start_tx(conn
);
1493 goto success_unlocked
;
1495 spin_unlock_bh(&session
->lock
);
1496 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1497 goto failed_unlocked
;
1500 conn
->tmf_state
= TMF_INITIAL
;
1501 /* ctask completed before tmf abort response */
1502 debug_scsi("sc completed while abort in progress\n");
1507 conn
->tmf_state
= TMF_INITIAL
;
1512 spin_unlock_bh(&session
->lock
);
1514 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1515 mutex_unlock(&session
->eh_mutex
);
1519 spin_unlock_bh(&session
->lock
);
1521 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc
,
1522 ctask
? ctask
->itt
: 0);
1523 mutex_unlock(&session
->eh_mutex
);
1526 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
1528 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
1530 memset(hdr
, 0, sizeof(*hdr
));
1531 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1532 hdr
->flags
= ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
1533 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1534 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
1535 hdr
->rtt
= RESERVED_ITT
;
1538 int iscsi_eh_device_reset(struct scsi_cmnd
*sc
)
1540 struct Scsi_Host
*host
= sc
->device
->host
;
1541 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
1542 struct iscsi_conn
*conn
;
1543 struct iscsi_tm
*hdr
;
1546 debug_scsi("LU Reset [sc %p lun %u]\n", sc
, sc
->device
->lun
);
1548 mutex_lock(&session
->eh_mutex
);
1549 spin_lock_bh(&session
->lock
);
1551 * Just check if we are not logged in. We cannot check for
1552 * the phase because the reset could come from a ioctl.
1554 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
1556 conn
= session
->leadconn
;
1558 /* only have one tmf outstanding at a time */
1559 if (conn
->tmf_state
!= TMF_INITIAL
)
1561 conn
->tmf_state
= TMF_QUEUED
;
1564 iscsi_prep_lun_reset_pdu(sc
, hdr
);
1566 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
1567 session
->lu_reset_timeout
)) {
1572 switch (conn
->tmf_state
) {
1576 spin_unlock_bh(&session
->lock
);
1577 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1580 conn
->tmf_state
= TMF_INITIAL
;
1585 spin_unlock_bh(&session
->lock
);
1587 iscsi_suspend_tx(conn
);
1588 /* need to grab the recv lock then session lock */
1589 write_lock_bh(conn
->recv_lock
);
1590 spin_lock(&session
->lock
);
1591 fail_all_commands(conn
, sc
->device
->lun
, DID_ERROR
);
1592 conn
->tmf_state
= TMF_INITIAL
;
1593 spin_unlock(&session
->lock
);
1594 write_unlock_bh(conn
->recv_lock
);
1596 iscsi_start_tx(conn
);
1600 spin_unlock_bh(&session
->lock
);
1602 debug_scsi("iscsi_eh_device_reset %s\n",
1603 rc
== SUCCESS
? "SUCCESS" : "FAILED");
1604 mutex_unlock(&session
->eh_mutex
);
1607 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset
);
1610 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1611 * should be accessed via kfifo_{get,put} on q->queue.
1612 * Optionally, the caller can obtain the array of object pointers
1613 * by passing in a non-NULL @items pointer
1616 iscsi_pool_init(struct iscsi_pool
*q
, int max
, void ***items
, int item_size
)
1618 int i
, num_arrays
= 1;
1620 memset(q
, 0, sizeof(*q
));
1624 /* If the user passed an items pointer, he wants a copy of
1628 q
->pool
= kzalloc(num_arrays
* max
* sizeof(void*), GFP_KERNEL
);
1629 if (q
->pool
== NULL
)
1632 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
1634 if (q
->queue
== ERR_PTR(-ENOMEM
))
1637 for (i
= 0; i
< max
; i
++) {
1638 q
->pool
[i
] = kzalloc(item_size
, GFP_KERNEL
);
1639 if (q
->pool
[i
] == NULL
) {
1643 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
1647 *items
= q
->pool
+ max
;
1648 memcpy(*items
, q
->pool
, max
* sizeof(void *));
1657 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
1659 void iscsi_pool_free(struct iscsi_pool
*q
)
1663 for (i
= 0; i
< q
->max
; i
++)
1668 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
1671 * iSCSI Session's hostdata organization:
1673 * *------------------* <== hostdata_session(host->hostdata)
1674 * | ptr to class sess|
1675 * |------------------| <== iscsi_hostdata(host->hostdata)
1677 * *------------------*
1680 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1681 _sz % sizeof(unsigned long))
1683 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1686 * iscsi_session_setup - create iscsi cls session and host and session
1687 * @scsit: scsi transport template
1688 * @iscsit: iscsi transport template
1689 * @cmds_max: scsi host can queue
1690 * @qdepth: scsi host cmds per lun
1691 * @cmd_task_size: LLD ctask private data size
1692 * @mgmt_task_size: LLD mtask private data size
1693 * @initial_cmdsn: initial CmdSN
1694 * @hostno: host no allocated
1696 * This can be used by software iscsi_transports that allocate
1697 * a session per scsi host.
1699 struct iscsi_cls_session
*
1700 iscsi_session_setup(struct iscsi_transport
*iscsit
,
1701 struct scsi_transport_template
*scsit
,
1702 uint16_t cmds_max
, uint16_t qdepth
,
1703 int cmd_task_size
, int mgmt_task_size
,
1704 uint32_t initial_cmdsn
, uint32_t *hostno
)
1706 struct Scsi_Host
*shost
;
1707 struct iscsi_session
*session
;
1708 struct iscsi_cls_session
*cls_session
;
1711 if (qdepth
> ISCSI_MAX_CMD_PER_LUN
|| qdepth
< 1) {
1713 printk(KERN_ERR
"iscsi: invalid queue depth of %d. "
1714 "Queue depth must be between 1 and %d.\n",
1715 qdepth
, ISCSI_MAX_CMD_PER_LUN
);
1716 qdepth
= ISCSI_DEF_CMD_PER_LUN
;
1719 if (!is_power_of_2(cmds_max
) ||
1720 cmds_max
>= ISCSI_MGMT_ITT_OFFSET
) {
1722 printk(KERN_ERR
"iscsi: invalid can_queue of %d. "
1723 "can_queue must be a power of 2 and between "
1724 "2 and %d - setting to %d.\n", cmds_max
,
1725 ISCSI_MGMT_ITT_OFFSET
, ISCSI_DEF_XMIT_CMDS_MAX
);
1726 cmds_max
= ISCSI_DEF_XMIT_CMDS_MAX
;
1729 shost
= scsi_host_alloc(iscsit
->host_template
,
1730 hostdata_privsize(sizeof(*session
)));
1734 /* the iscsi layer takes one task for reserve */
1735 shost
->can_queue
= cmds_max
- 1;
1736 shost
->cmd_per_lun
= qdepth
;
1738 shost
->max_channel
= 0;
1739 shost
->max_lun
= iscsit
->max_lun
;
1740 shost
->max_cmd_len
= iscsit
->max_cmd_len
;
1741 shost
->transportt
= scsit
;
1742 shost
->transportt
->create_work_queue
= 1;
1743 shost
->transportt
->eh_timed_out
= iscsi_eh_cmd_timed_out
;
1744 *hostno
= shost
->host_no
;
1746 session
= iscsi_hostdata(shost
->hostdata
);
1747 memset(session
, 0, sizeof(struct iscsi_session
));
1748 session
->host
= shost
;
1749 session
->state
= ISCSI_STATE_FREE
;
1750 session
->fast_abort
= 1;
1751 session
->lu_reset_timeout
= 15;
1752 session
->abort_timeout
= 10;
1753 session
->mgmtpool_max
= ISCSI_MGMT_CMDS_MAX
;
1754 session
->cmds_max
= cmds_max
;
1755 session
->queued_cmdsn
= session
->cmdsn
= initial_cmdsn
;
1756 session
->exp_cmdsn
= initial_cmdsn
+ 1;
1757 session
->max_cmdsn
= initial_cmdsn
+ 1;
1758 session
->max_r2t
= 1;
1759 session
->tt
= iscsit
;
1760 mutex_init(&session
->eh_mutex
);
1762 /* initialize SCSI PDU commands pool */
1763 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
1764 (void***)&session
->cmds
,
1765 cmd_task_size
+ sizeof(struct iscsi_cmd_task
)))
1766 goto cmdpool_alloc_fail
;
1768 /* pre-format cmds pool with ITT */
1769 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
1770 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
1773 ctask
->dd_data
= &ctask
[1];
1775 INIT_LIST_HEAD(&ctask
->running
);
1778 spin_lock_init(&session
->lock
);
1780 /* initialize immediate command pool */
1781 if (iscsi_pool_init(&session
->mgmtpool
, session
->mgmtpool_max
,
1782 (void***)&session
->mgmt_cmds
,
1783 mgmt_task_size
+ sizeof(struct iscsi_mgmt_task
)))
1784 goto mgmtpool_alloc_fail
;
1787 /* pre-format immediate cmds pool with ITT */
1788 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++) {
1789 struct iscsi_mgmt_task
*mtask
= session
->mgmt_cmds
[cmd_i
];
1792 mtask
->dd_data
= &mtask
[1];
1793 mtask
->itt
= ISCSI_MGMT_ITT_OFFSET
+ cmd_i
;
1794 INIT_LIST_HEAD(&mtask
->running
);
1797 if (scsi_add_host(shost
, NULL
))
1800 if (!try_module_get(iscsit
->owner
))
1801 goto cls_session_fail
;
1803 cls_session
= iscsi_create_session(shost
, iscsit
, 0);
1806 *(unsigned long*)shost
->hostdata
= (unsigned long)cls_session
;
1811 module_put(iscsit
->owner
);
1813 scsi_remove_host(shost
);
1815 iscsi_pool_free(&session
->mgmtpool
);
1816 mgmtpool_alloc_fail
:
1817 iscsi_pool_free(&session
->cmdpool
);
1819 scsi_host_put(shost
);
1822 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
1825 * iscsi_session_teardown - destroy session, host, and cls_session
1828 * This can be used by software iscsi_transports that allocate
1829 * a session per scsi host.
1831 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
1833 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1834 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1835 struct module
*owner
= cls_session
->transport
->owner
;
1837 iscsi_remove_session(cls_session
);
1838 scsi_remove_host(shost
);
1840 iscsi_pool_free(&session
->mgmtpool
);
1841 iscsi_pool_free(&session
->cmdpool
);
1843 kfree(session
->password
);
1844 kfree(session
->password_in
);
1845 kfree(session
->username
);
1846 kfree(session
->username_in
);
1847 kfree(session
->targetname
);
1848 kfree(session
->netdev
);
1849 kfree(session
->hwaddress
);
1850 kfree(session
->initiatorname
);
1852 iscsi_free_session(cls_session
);
1853 scsi_host_put(shost
);
1856 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
1859 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1860 * @cls_session: iscsi_cls_session
1863 struct iscsi_cls_conn
*
1864 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, uint32_t conn_idx
)
1866 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1867 struct iscsi_conn
*conn
;
1868 struct iscsi_cls_conn
*cls_conn
;
1871 cls_conn
= iscsi_create_conn(cls_session
, conn_idx
);
1874 conn
= cls_conn
->dd_data
;
1875 memset(conn
, 0, sizeof(*conn
));
1877 conn
->session
= session
;
1878 conn
->cls_conn
= cls_conn
;
1879 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
1880 conn
->id
= conn_idx
;
1881 conn
->exp_statsn
= 0;
1882 conn
->tmf_state
= TMF_INITIAL
;
1884 init_timer(&conn
->transport_timer
);
1885 conn
->transport_timer
.data
= (unsigned long)conn
;
1886 conn
->transport_timer
.function
= iscsi_check_transport_timeouts
;
1888 INIT_LIST_HEAD(&conn
->run_list
);
1889 INIT_LIST_HEAD(&conn
->mgmt_run_list
);
1890 INIT_LIST_HEAD(&conn
->mgmtqueue
);
1891 INIT_LIST_HEAD(&conn
->xmitqueue
);
1892 INIT_LIST_HEAD(&conn
->requeue
);
1893 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
1895 /* allocate login_mtask used for the login/text sequences */
1896 spin_lock_bh(&session
->lock
);
1897 if (!__kfifo_get(session
->mgmtpool
.queue
,
1898 (void*)&conn
->login_mtask
,
1900 spin_unlock_bh(&session
->lock
);
1901 goto login_mtask_alloc_fail
;
1903 spin_unlock_bh(&session
->lock
);
1905 data
= kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN
, GFP_KERNEL
);
1907 goto login_mtask_data_alloc_fail
;
1908 conn
->login_mtask
->data
= conn
->data
= data
;
1910 init_timer(&conn
->tmf_timer
);
1911 init_waitqueue_head(&conn
->ehwait
);
1915 login_mtask_data_alloc_fail
:
1916 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1918 login_mtask_alloc_fail
:
1919 iscsi_destroy_conn(cls_conn
);
1922 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
1925 * iscsi_conn_teardown - teardown iscsi connection
1926 * cls_conn: iscsi class connection
1928 * TODO: we may need to make this into a two step process
1929 * like scsi-mls remove + put host
1931 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
1933 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1934 struct iscsi_session
*session
= conn
->session
;
1935 unsigned long flags
;
1937 del_timer_sync(&conn
->transport_timer
);
1939 spin_lock_bh(&session
->lock
);
1940 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
1941 if (session
->leadconn
== conn
) {
1943 * leading connection? then give up on recovery.
1945 session
->state
= ISCSI_STATE_TERMINATE
;
1946 wake_up(&conn
->ehwait
);
1948 spin_unlock_bh(&session
->lock
);
1951 * Block until all in-progress commands for this connection
1955 spin_lock_irqsave(session
->host
->host_lock
, flags
);
1956 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
1957 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1960 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1961 msleep_interruptible(500);
1962 iscsi_conn_printk(KERN_INFO
, conn
, "iscsi conn_destroy(): "
1963 "host_busy %d host_failed %d\n",
1964 session
->host
->host_busy
,
1965 session
->host
->host_failed
);
1967 * force eh_abort() to unblock
1969 wake_up(&conn
->ehwait
);
1972 /* flush queued up work because we free the connection below */
1973 iscsi_suspend_tx(conn
);
1975 spin_lock_bh(&session
->lock
);
1977 kfree(conn
->persistent_address
);
1978 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1980 if (session
->leadconn
== conn
)
1981 session
->leadconn
= NULL
;
1982 spin_unlock_bh(&session
->lock
);
1984 iscsi_destroy_conn(cls_conn
);
1986 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
1988 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
1990 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1991 struct iscsi_session
*session
= conn
->session
;
1994 iscsi_conn_printk(KERN_ERR
, conn
,
1995 "can't start unbound connection\n");
1999 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
2000 session
->first_burst
> session
->max_burst
) {
2001 iscsi_conn_printk(KERN_INFO
, conn
, "invalid burst lengths: "
2002 "first_burst %d max_burst %d\n",
2003 session
->first_burst
, session
->max_burst
);
2007 if (conn
->ping_timeout
&& !conn
->recv_timeout
) {
2008 iscsi_conn_printk(KERN_ERR
, conn
, "invalid recv timeout of "
2009 "zero. Using 5 seconds\n.");
2010 conn
->recv_timeout
= 5;
2013 if (conn
->recv_timeout
&& !conn
->ping_timeout
) {
2014 iscsi_conn_printk(KERN_ERR
, conn
, "invalid ping timeout of "
2015 "zero. Using 5 seconds.\n");
2016 conn
->ping_timeout
= 5;
2019 spin_lock_bh(&session
->lock
);
2020 conn
->c_stage
= ISCSI_CONN_STARTED
;
2021 session
->state
= ISCSI_STATE_LOGGED_IN
;
2022 session
->queued_cmdsn
= session
->cmdsn
;
2024 conn
->last_recv
= jiffies
;
2025 conn
->last_ping
= jiffies
;
2026 if (conn
->recv_timeout
&& conn
->ping_timeout
)
2027 mod_timer(&conn
->transport_timer
,
2028 jiffies
+ (conn
->recv_timeout
* HZ
));
2030 switch(conn
->stop_stage
) {
2031 case STOP_CONN_RECOVER
:
2033 * unblock eh_abort() if it is blocked. re-try all
2034 * commands after successful recovery
2036 conn
->stop_stage
= 0;
2037 conn
->tmf_state
= TMF_INITIAL
;
2040 case STOP_CONN_TERM
:
2041 conn
->stop_stage
= 0;
2046 spin_unlock_bh(&session
->lock
);
2048 iscsi_unblock_session(session_to_cls(session
));
2049 wake_up(&conn
->ehwait
);
2052 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
2055 flush_control_queues(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
2057 struct iscsi_mgmt_task
*mtask
, *tmp
;
2059 /* handle pending */
2060 list_for_each_entry_safe(mtask
, tmp
, &conn
->mgmtqueue
, running
) {
2061 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask
->itt
);
2062 iscsi_free_mgmt_task(conn
, mtask
);
2065 /* handle running */
2066 list_for_each_entry_safe(mtask
, tmp
, &conn
->mgmt_run_list
, running
) {
2067 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask
->itt
);
2068 iscsi_free_mgmt_task(conn
, mtask
);
2074 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
2075 struct iscsi_conn
*conn
, int flag
)
2079 del_timer_sync(&conn
->transport_timer
);
2081 mutex_lock(&session
->eh_mutex
);
2082 spin_lock_bh(&session
->lock
);
2083 if (conn
->stop_stage
== STOP_CONN_TERM
) {
2084 spin_unlock_bh(&session
->lock
);
2085 mutex_unlock(&session
->eh_mutex
);
2090 * The LLD either freed/unset the lock on us, or userspace called
2091 * stop but did not create a proper connection (connection was never
2092 * bound or it was unbound then stop was called).
2094 if (!conn
->recv_lock
) {
2095 spin_unlock_bh(&session
->lock
);
2096 mutex_unlock(&session
->eh_mutex
);
2101 * When this is called for the in_login state, we only want to clean
2102 * up the login task and connection. We do not need to block and set
2103 * the recovery state again
2105 if (flag
== STOP_CONN_TERM
)
2106 session
->state
= ISCSI_STATE_TERMINATE
;
2107 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
2108 session
->state
= ISCSI_STATE_IN_RECOVERY
;
2110 old_stop_stage
= conn
->stop_stage
;
2111 conn
->stop_stage
= flag
;
2112 conn
->c_stage
= ISCSI_CONN_STOPPED
;
2113 spin_unlock_bh(&session
->lock
);
2115 iscsi_suspend_tx(conn
);
2117 write_lock_bh(conn
->recv_lock
);
2118 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
2119 write_unlock_bh(conn
->recv_lock
);
2122 * for connection level recovery we should not calculate
2123 * header digest. conn->hdr_size used for optimization
2124 * in hdr_extract() and will be re-negotiated at
2127 if (flag
== STOP_CONN_RECOVER
) {
2128 conn
->hdrdgst_en
= 0;
2129 conn
->datadgst_en
= 0;
2130 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
2131 old_stop_stage
!= STOP_CONN_RECOVER
) {
2132 debug_scsi("blocking session\n");
2133 iscsi_block_session(session_to_cls(session
));
2140 spin_lock_bh(&session
->lock
);
2141 fail_all_commands(conn
, -1,
2142 STOP_CONN_RECOVER
? DID_BUS_BUSY
: DID_ERROR
);
2143 flush_control_queues(session
, conn
);
2144 spin_unlock_bh(&session
->lock
);
2145 mutex_unlock(&session
->eh_mutex
);
2148 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
2150 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2151 struct iscsi_session
*session
= conn
->session
;
2154 case STOP_CONN_RECOVER
:
2155 case STOP_CONN_TERM
:
2156 iscsi_start_session_recovery(session
, conn
, flag
);
2159 iscsi_conn_printk(KERN_ERR
, conn
,
2160 "invalid stop flag %d\n", flag
);
2163 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
2165 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
2166 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
2168 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
2169 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2171 spin_lock_bh(&session
->lock
);
2173 session
->leadconn
= conn
;
2174 spin_unlock_bh(&session
->lock
);
2177 * Unblock xmitworker(), Login Phase will pass through.
2179 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
2180 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
2183 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
2186 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
2187 enum iscsi_param param
, char *buf
, int buflen
)
2189 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2190 struct iscsi_session
*session
= conn
->session
;
2194 case ISCSI_PARAM_FAST_ABORT
:
2195 sscanf(buf
, "%d", &session
->fast_abort
);
2197 case ISCSI_PARAM_ABORT_TMO
:
2198 sscanf(buf
, "%d", &session
->abort_timeout
);
2200 case ISCSI_PARAM_LU_RESET_TMO
:
2201 sscanf(buf
, "%d", &session
->lu_reset_timeout
);
2203 case ISCSI_PARAM_PING_TMO
:
2204 sscanf(buf
, "%d", &conn
->ping_timeout
);
2206 case ISCSI_PARAM_RECV_TMO
:
2207 sscanf(buf
, "%d", &conn
->recv_timeout
);
2209 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2210 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
2212 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2213 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
2215 case ISCSI_PARAM_HDRDGST_EN
:
2216 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
2218 case ISCSI_PARAM_DATADGST_EN
:
2219 sscanf(buf
, "%d", &conn
->datadgst_en
);
2221 case ISCSI_PARAM_INITIAL_R2T_EN
:
2222 sscanf(buf
, "%d", &session
->initial_r2t_en
);
2224 case ISCSI_PARAM_MAX_R2T
:
2225 sscanf(buf
, "%d", &session
->max_r2t
);
2227 case ISCSI_PARAM_IMM_DATA_EN
:
2228 sscanf(buf
, "%d", &session
->imm_data_en
);
2230 case ISCSI_PARAM_FIRST_BURST
:
2231 sscanf(buf
, "%d", &session
->first_burst
);
2233 case ISCSI_PARAM_MAX_BURST
:
2234 sscanf(buf
, "%d", &session
->max_burst
);
2236 case ISCSI_PARAM_PDU_INORDER_EN
:
2237 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
2239 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2240 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
2242 case ISCSI_PARAM_ERL
:
2243 sscanf(buf
, "%d", &session
->erl
);
2245 case ISCSI_PARAM_IFMARKER_EN
:
2246 sscanf(buf
, "%d", &value
);
2249 case ISCSI_PARAM_OFMARKER_EN
:
2250 sscanf(buf
, "%d", &value
);
2253 case ISCSI_PARAM_EXP_STATSN
:
2254 sscanf(buf
, "%u", &conn
->exp_statsn
);
2256 case ISCSI_PARAM_USERNAME
:
2257 kfree(session
->username
);
2258 session
->username
= kstrdup(buf
, GFP_KERNEL
);
2259 if (!session
->username
)
2262 case ISCSI_PARAM_USERNAME_IN
:
2263 kfree(session
->username_in
);
2264 session
->username_in
= kstrdup(buf
, GFP_KERNEL
);
2265 if (!session
->username_in
)
2268 case ISCSI_PARAM_PASSWORD
:
2269 kfree(session
->password
);
2270 session
->password
= kstrdup(buf
, GFP_KERNEL
);
2271 if (!session
->password
)
2274 case ISCSI_PARAM_PASSWORD_IN
:
2275 kfree(session
->password_in
);
2276 session
->password_in
= kstrdup(buf
, GFP_KERNEL
);
2277 if (!session
->password_in
)
2280 case ISCSI_PARAM_TARGET_NAME
:
2281 /* this should not change between logins */
2282 if (session
->targetname
)
2285 session
->targetname
= kstrdup(buf
, GFP_KERNEL
);
2286 if (!session
->targetname
)
2289 case ISCSI_PARAM_TPGT
:
2290 sscanf(buf
, "%d", &session
->tpgt
);
2292 case ISCSI_PARAM_PERSISTENT_PORT
:
2293 sscanf(buf
, "%d", &conn
->persistent_port
);
2295 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2297 * this is the address returned in discovery so it should
2298 * not change between logins.
2300 if (conn
->persistent_address
)
2303 conn
->persistent_address
= kstrdup(buf
, GFP_KERNEL
);
2304 if (!conn
->persistent_address
)
2313 EXPORT_SYMBOL_GPL(iscsi_set_param
);
2315 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
2316 enum iscsi_param param
, char *buf
)
2318 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
2319 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2323 case ISCSI_PARAM_FAST_ABORT
:
2324 len
= sprintf(buf
, "%d\n", session
->fast_abort
);
2326 case ISCSI_PARAM_ABORT_TMO
:
2327 len
= sprintf(buf
, "%d\n", session
->abort_timeout
);
2329 case ISCSI_PARAM_LU_RESET_TMO
:
2330 len
= sprintf(buf
, "%d\n", session
->lu_reset_timeout
);
2332 case ISCSI_PARAM_INITIAL_R2T_EN
:
2333 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
2335 case ISCSI_PARAM_MAX_R2T
:
2336 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
2338 case ISCSI_PARAM_IMM_DATA_EN
:
2339 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
2341 case ISCSI_PARAM_FIRST_BURST
:
2342 len
= sprintf(buf
, "%u\n", session
->first_burst
);
2344 case ISCSI_PARAM_MAX_BURST
:
2345 len
= sprintf(buf
, "%u\n", session
->max_burst
);
2347 case ISCSI_PARAM_PDU_INORDER_EN
:
2348 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
2350 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2351 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
2353 case ISCSI_PARAM_ERL
:
2354 len
= sprintf(buf
, "%d\n", session
->erl
);
2356 case ISCSI_PARAM_TARGET_NAME
:
2357 len
= sprintf(buf
, "%s\n", session
->targetname
);
2359 case ISCSI_PARAM_TPGT
:
2360 len
= sprintf(buf
, "%d\n", session
->tpgt
);
2362 case ISCSI_PARAM_USERNAME
:
2363 len
= sprintf(buf
, "%s\n", session
->username
);
2365 case ISCSI_PARAM_USERNAME_IN
:
2366 len
= sprintf(buf
, "%s\n", session
->username_in
);
2368 case ISCSI_PARAM_PASSWORD
:
2369 len
= sprintf(buf
, "%s\n", session
->password
);
2371 case ISCSI_PARAM_PASSWORD_IN
:
2372 len
= sprintf(buf
, "%s\n", session
->password_in
);
2380 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
2382 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
2383 enum iscsi_param param
, char *buf
)
2385 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2389 case ISCSI_PARAM_PING_TMO
:
2390 len
= sprintf(buf
, "%u\n", conn
->ping_timeout
);
2392 case ISCSI_PARAM_RECV_TMO
:
2393 len
= sprintf(buf
, "%u\n", conn
->recv_timeout
);
2395 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2396 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
2398 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2399 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
2401 case ISCSI_PARAM_HDRDGST_EN
:
2402 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
2404 case ISCSI_PARAM_DATADGST_EN
:
2405 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
2407 case ISCSI_PARAM_IFMARKER_EN
:
2408 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
2410 case ISCSI_PARAM_OFMARKER_EN
:
2411 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
2413 case ISCSI_PARAM_EXP_STATSN
:
2414 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
2416 case ISCSI_PARAM_PERSISTENT_PORT
:
2417 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
2419 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2420 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
2428 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
2430 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2433 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2437 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2438 if (!session
->netdev
)
2439 len
= sprintf(buf
, "%s\n", "default");
2441 len
= sprintf(buf
, "%s\n", session
->netdev
);
2443 case ISCSI_HOST_PARAM_HWADDRESS
:
2444 if (!session
->hwaddress
)
2445 len
= sprintf(buf
, "%s\n", "default");
2447 len
= sprintf(buf
, "%s\n", session
->hwaddress
);
2449 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2450 if (!session
->initiatorname
)
2451 len
= sprintf(buf
, "%s\n", "unknown");
2453 len
= sprintf(buf
, "%s\n", session
->initiatorname
);
2462 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
2464 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2465 char *buf
, int buflen
)
2467 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2470 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2471 if (!session
->netdev
)
2472 session
->netdev
= kstrdup(buf
, GFP_KERNEL
);
2474 case ISCSI_HOST_PARAM_HWADDRESS
:
2475 if (!session
->hwaddress
)
2476 session
->hwaddress
= kstrdup(buf
, GFP_KERNEL
);
2478 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2479 if (!session
->initiatorname
)
2480 session
->initiatorname
= kstrdup(buf
, GFP_KERNEL
);
2488 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
2490 MODULE_AUTHOR("Mike Christie");
2491 MODULE_DESCRIPTION("iSCSI library functions");
2492 MODULE_LICENSE("GPL");