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 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
42 #define SNA32_CHECK 2147483648UL
44 static int iscsi_sna_lt(u32 n1
, u32 n2
)
46 return n1
!= n2
&& ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
47 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
50 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
51 static int iscsi_sna_lte(u32 n1
, u32 n2
)
53 return n1
== n2
|| ((n1
< n2
&& (n2
- n1
< SNA32_CHECK
)) ||
54 (n1
> n2
&& (n2
- n1
< SNA32_CHECK
)));
58 iscsi_update_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
60 uint32_t max_cmdsn
= be32_to_cpu(hdr
->max_cmdsn
);
61 uint32_t exp_cmdsn
= be32_to_cpu(hdr
->exp_cmdsn
);
64 * standard specifies this check for when to update expected and
65 * max sequence numbers
67 if (iscsi_sna_lt(max_cmdsn
, exp_cmdsn
- 1))
70 if (exp_cmdsn
!= session
->exp_cmdsn
&&
71 !iscsi_sna_lt(exp_cmdsn
, session
->exp_cmdsn
))
72 session
->exp_cmdsn
= exp_cmdsn
;
74 if (max_cmdsn
!= session
->max_cmdsn
&&
75 !iscsi_sna_lt(max_cmdsn
, session
->max_cmdsn
)) {
76 session
->max_cmdsn
= max_cmdsn
;
78 * if the window closed with IO queued, then kick the
81 if (!list_empty(&session
->leadconn
->xmitqueue
) ||
82 !list_empty(&session
->leadconn
->mgmtqueue
)) {
83 if (!(session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
84 scsi_queue_work(session
->host
,
85 &session
->leadconn
->xmitwork
);
89 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn
);
91 void iscsi_prep_unsolicit_data_pdu(struct iscsi_task
*task
,
92 struct iscsi_data
*hdr
)
94 struct iscsi_conn
*conn
= task
->conn
;
96 memset(hdr
, 0, sizeof(struct iscsi_data
));
97 hdr
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
98 hdr
->datasn
= cpu_to_be32(task
->unsol_datasn
);
100 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
101 memcpy(hdr
->lun
, task
->hdr
->lun
, sizeof(hdr
->lun
));
103 hdr
->itt
= task
->hdr
->itt
;
104 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
105 hdr
->offset
= cpu_to_be32(task
->unsol_offset
);
107 if (task
->unsol_count
> conn
->max_xmit_dlength
) {
108 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
109 task
->data_count
= conn
->max_xmit_dlength
;
110 task
->unsol_offset
+= task
->data_count
;
113 hton24(hdr
->dlength
, task
->unsol_count
);
114 task
->data_count
= task
->unsol_count
;
115 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
118 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu
);
120 static int iscsi_add_hdr(struct iscsi_task
*task
, unsigned len
)
122 unsigned exp_len
= task
->hdr_len
+ len
;
124 if (exp_len
> task
->hdr_max
) {
129 WARN_ON(len
& (ISCSI_PAD_LEN
- 1)); /* caller must pad the AHS */
130 task
->hdr_len
= exp_len
;
135 * make an extended cdb AHS
137 static int iscsi_prep_ecdb_ahs(struct iscsi_task
*task
)
139 struct scsi_cmnd
*cmd
= task
->sc
;
140 unsigned rlen
, pad_len
;
141 unsigned short ahslength
;
142 struct iscsi_ecdb_ahdr
*ecdb_ahdr
;
145 ecdb_ahdr
= iscsi_next_hdr(task
);
146 rlen
= cmd
->cmd_len
- ISCSI_CDB_SIZE
;
148 BUG_ON(rlen
> sizeof(ecdb_ahdr
->ecdb
));
149 ahslength
= rlen
+ sizeof(ecdb_ahdr
->reserved
);
151 pad_len
= iscsi_padding(rlen
);
153 rc
= iscsi_add_hdr(task
, sizeof(ecdb_ahdr
->ahslength
) +
154 sizeof(ecdb_ahdr
->ahstype
) + ahslength
+ pad_len
);
159 memset(&ecdb_ahdr
->ecdb
[rlen
], 0, pad_len
);
161 ecdb_ahdr
->ahslength
= cpu_to_be16(ahslength
);
162 ecdb_ahdr
->ahstype
= ISCSI_AHSTYPE_CDB
;
163 ecdb_ahdr
->reserved
= 0;
164 memcpy(ecdb_ahdr
->ecdb
, cmd
->cmnd
+ ISCSI_CDB_SIZE
, rlen
);
166 debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
167 "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n",
168 cmd
->cmd_len
, rlen
, pad_len
, ahslength
, task
->hdr_len
);
173 static int iscsi_prep_bidi_ahs(struct iscsi_task
*task
)
175 struct scsi_cmnd
*sc
= task
->sc
;
176 struct iscsi_rlength_ahdr
*rlen_ahdr
;
179 rlen_ahdr
= iscsi_next_hdr(task
);
180 rc
= iscsi_add_hdr(task
, sizeof(*rlen_ahdr
));
184 rlen_ahdr
->ahslength
=
185 cpu_to_be16(sizeof(rlen_ahdr
->read_length
) +
186 sizeof(rlen_ahdr
->reserved
));
187 rlen_ahdr
->ahstype
= ISCSI_AHSTYPE_RLENGTH
;
188 rlen_ahdr
->reserved
= 0;
189 rlen_ahdr
->read_length
= cpu_to_be32(scsi_in(sc
)->length
);
191 debug_scsi("bidi-in rlen_ahdr->read_length(%d) "
192 "rlen_ahdr->ahslength(%d)\n",
193 be32_to_cpu(rlen_ahdr
->read_length
),
194 be16_to_cpu(rlen_ahdr
->ahslength
));
199 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
202 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
203 * fields like dlength or final based on how much data it sends
205 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task
*task
)
207 struct iscsi_conn
*conn
= task
->conn
;
208 struct iscsi_session
*session
= conn
->session
;
209 struct iscsi_cmd
*hdr
= task
->hdr
;
210 struct scsi_cmnd
*sc
= task
->sc
;
211 unsigned hdrlength
, cmd_len
;
215 rc
= iscsi_add_hdr(task
, sizeof(*hdr
));
218 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
219 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
220 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
221 hdr
->itt
= build_itt(task
->itt
, session
->age
);
222 hdr
->cmdsn
= cpu_to_be32(session
->cmdsn
);
224 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
225 cmd_len
= sc
->cmd_len
;
226 if (cmd_len
< ISCSI_CDB_SIZE
)
227 memset(&hdr
->cdb
[cmd_len
], 0, ISCSI_CDB_SIZE
- cmd_len
);
228 else if (cmd_len
> ISCSI_CDB_SIZE
) {
229 rc
= iscsi_prep_ecdb_ahs(task
);
232 cmd_len
= ISCSI_CDB_SIZE
;
234 memcpy(hdr
->cdb
, sc
->cmnd
, cmd_len
);
237 if (scsi_bidi_cmnd(sc
)) {
238 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
239 rc
= iscsi_prep_bidi_ahs(task
);
243 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
244 unsigned out_len
= scsi_out(sc
)->length
;
245 hdr
->data_length
= cpu_to_be32(out_len
);
246 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
250 * imm_count bytes to be sent right after
253 * unsol_count bytes(as Data-Out) to be sent
254 * without R2T ack right after
257 * r2t_data_count bytes to be sent via R2T ack's
259 * pad_count bytes to be sent as zero-padding
261 task
->unsol_count
= 0;
262 task
->unsol_offset
= 0;
263 task
->unsol_datasn
= 0;
265 if (session
->imm_data_en
) {
266 if (out_len
>= session
->first_burst
)
267 task
->imm_count
= min(session
->first_burst
,
268 conn
->max_xmit_dlength
);
270 task
->imm_count
= min(out_len
,
271 conn
->max_xmit_dlength
);
272 hton24(hdr
->dlength
, task
->imm_count
);
274 zero_data(hdr
->dlength
);
276 if (!session
->initial_r2t_en
) {
277 task
->unsol_count
= min(session
->first_burst
, out_len
)
279 task
->unsol_offset
= task
->imm_count
;
282 if (!task
->unsol_count
)
283 /* No unsolicit Data-Out's */
284 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
286 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
287 zero_data(hdr
->dlength
);
288 hdr
->data_length
= cpu_to_be32(scsi_in(sc
)->length
);
290 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
291 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
294 /* calculate size of additional header segments (AHSs) */
295 hdrlength
= task
->hdr_len
- sizeof(*hdr
);
297 WARN_ON(hdrlength
& (ISCSI_PAD_LEN
-1));
298 hdrlength
/= ISCSI_PAD_LEN
;
300 WARN_ON(hdrlength
>= 256);
301 hdr
->hlength
= hdrlength
& 0xFF;
303 if (conn
->session
->tt
->init_task
&&
304 conn
->session
->tt
->init_task(task
))
307 task
->state
= ISCSI_TASK_RUNNING
;
308 list_move_tail(&task
->running
, &conn
->run_list
);
310 conn
->scsicmd_pdus_cnt
++;
311 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
312 "bidi_len %d cmdsn %d win %d]\n", scsi_bidi_cmnd(sc
) ?
313 "bidirectional" : sc
->sc_data_direction
== DMA_TO_DEVICE
?
314 "write" : "read", conn
->id
, sc
, sc
->cmnd
[0], task
->itt
,
316 scsi_bidi_cmnd(sc
) ? scsi_in(sc
)->length
: 0,
317 session
->cmdsn
, session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
322 * iscsi_complete_command - finish a task
323 * @task: iscsi cmd task
325 * Must be called with session lock.
326 * This function returns the scsi command to scsi-ml or cleans
327 * up mgmt tasks then returns the task to the pool.
329 static void iscsi_complete_command(struct iscsi_task
*task
)
331 struct iscsi_conn
*conn
= task
->conn
;
332 struct iscsi_session
*session
= conn
->session
;
333 struct scsi_cmnd
*sc
= task
->sc
;
335 list_del_init(&task
->running
);
336 task
->state
= ISCSI_TASK_COMPLETED
;
339 if (conn
->task
== task
)
342 * login task is preallocated so do not free
344 if (conn
->login_task
== task
)
347 __kfifo_put(session
->cmdpool
.queue
, (void*)&task
, sizeof(void*));
349 if (conn
->ping_task
== task
)
350 conn
->ping_task
= NULL
;
354 /* SCSI eh reuses commands to verify us */
357 * queue command may call this to free the task, but
358 * not have setup the sc callback
365 static void __iscsi_get_task(struct iscsi_task
*task
)
367 atomic_inc(&task
->refcount
);
370 static void __iscsi_put_task(struct iscsi_task
*task
)
372 if (atomic_dec_and_test(&task
->refcount
))
373 iscsi_complete_command(task
);
376 void iscsi_put_task(struct iscsi_task
*task
)
378 struct iscsi_session
*session
= task
->conn
->session
;
380 spin_lock_bh(&session
->lock
);
381 __iscsi_put_task(task
);
382 spin_unlock_bh(&session
->lock
);
384 EXPORT_SYMBOL_GPL(iscsi_put_task
);
387 * session lock must be held
389 static void fail_command(struct iscsi_conn
*conn
, struct iscsi_task
*task
,
392 struct scsi_cmnd
*sc
;
398 if (task
->state
== ISCSI_TASK_PENDING
)
400 * cmd never made it to the xmit thread, so we should not count
401 * the cmd in the sequencing
403 conn
->session
->queued_cmdsn
--;
405 conn
->session
->tt
->cleanup_task(conn
, task
);
409 if (!scsi_bidi_cmnd(sc
))
410 scsi_set_resid(sc
, scsi_bufflen(sc
));
412 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
413 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
416 if (conn
->task
== task
)
418 /* release ref from queuecommand */
419 __iscsi_put_task(task
);
422 static int iscsi_prep_mgmt_task(struct iscsi_conn
*conn
,
423 struct iscsi_task
*task
)
425 struct iscsi_session
*session
= conn
->session
;
426 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)task
->hdr
;
427 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
429 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
432 if (hdr
->opcode
!= (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) &&
433 hdr
->opcode
!= (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
434 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
436 * pre-format CmdSN for outgoing PDU.
438 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
439 if (hdr
->itt
!= RESERVED_ITT
) {
440 hdr
->itt
= build_itt(task
->itt
, session
->age
);
442 * TODO: We always use immediate, so we never hit this.
443 * If we start to send tmfs or nops as non-immediate then
444 * we should start checking the cmdsn numbers for mgmt tasks.
446 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
447 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
448 session
->queued_cmdsn
++;
453 if (session
->tt
->init_task
)
454 session
->tt
->init_task(task
);
456 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
)
457 session
->state
= ISCSI_STATE_LOGGING_OUT
;
459 list_move_tail(&task
->running
, &conn
->mgmt_run_list
);
460 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
461 hdr
->opcode
& ISCSI_OPCODE_MASK
, hdr
->itt
,
466 static struct iscsi_task
*
467 __iscsi_conn_send_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
468 char *data
, uint32_t data_size
)
470 struct iscsi_session
*session
= conn
->session
;
471 struct iscsi_task
*task
;
473 if (session
->state
== ISCSI_STATE_TERMINATE
)
476 if (hdr
->opcode
== (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) ||
477 hdr
->opcode
== (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
479 * Login and Text are sent serially, in
480 * request-followed-by-response sequence.
481 * Same task can be used. Same ITT must be used.
482 * Note that login_task is preallocated at conn_create().
484 task
= conn
->login_task
;
486 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
487 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
489 if (!__kfifo_get(session
->cmdpool
.queue
,
490 (void*)&task
, sizeof(void*)))
493 if ((hdr
->opcode
== (ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
)) &&
494 hdr
->ttt
== RESERVED_ITT
) {
495 conn
->ping_task
= task
;
496 conn
->last_ping
= jiffies
;
500 * released in complete pdu for task we expect a response for, and
501 * released by the lld when it has transmitted the task for
502 * pdus we do not expect a response for.
504 atomic_set(&task
->refcount
, 1);
509 memcpy(task
->data
, data
, data_size
);
510 task
->data_count
= data_size
;
512 task
->data_count
= 0;
514 memcpy(task
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
515 INIT_LIST_HEAD(&task
->running
);
516 list_add_tail(&task
->running
, &conn
->mgmtqueue
);
518 if (session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
) {
519 if (iscsi_prep_mgmt_task(conn
, task
)) {
520 __iscsi_put_task(task
);
524 if (session
->tt
->xmit_task(task
))
528 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
533 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
534 char *data
, uint32_t data_size
)
536 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
537 struct iscsi_session
*session
= conn
->session
;
540 spin_lock_bh(&session
->lock
);
541 if (!__iscsi_conn_send_pdu(conn
, hdr
, data
, data_size
))
543 spin_unlock_bh(&session
->lock
);
546 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
549 * iscsi_cmd_rsp - SCSI Command Response processing
550 * @conn: iscsi connection
552 * @task: scsi command task
553 * @data: cmd data buffer
554 * @datalen: len of buffer
556 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
557 * then completes the command and task.
559 static void iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
560 struct iscsi_task
*task
, char *data
,
563 struct iscsi_cmd_rsp
*rhdr
= (struct iscsi_cmd_rsp
*)hdr
;
564 struct iscsi_session
*session
= conn
->session
;
565 struct scsi_cmnd
*sc
= task
->sc
;
567 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
568 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
570 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
572 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
573 sc
->result
= DID_ERROR
<< 16;
577 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
582 iscsi_conn_printk(KERN_ERR
, conn
,
583 "Got CHECK_CONDITION but invalid data "
584 "buffer size of %d\n", datalen
);
585 sc
->result
= DID_BAD_TARGET
<< 16;
589 senselen
= be16_to_cpu(get_unaligned((__be16
*) data
));
590 if (datalen
< senselen
)
591 goto invalid_datalen
;
593 memcpy(sc
->sense_buffer
, data
+ 2,
594 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
595 debug_scsi("copied %d bytes of sense\n",
596 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
599 if (rhdr
->flags
& (ISCSI_FLAG_CMD_BIDI_UNDERFLOW
|
600 ISCSI_FLAG_CMD_BIDI_OVERFLOW
)) {
601 int res_count
= be32_to_cpu(rhdr
->bi_residual_count
);
603 if (scsi_bidi_cmnd(sc
) && res_count
> 0 &&
604 (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_OVERFLOW
||
605 res_count
<= scsi_in(sc
)->length
))
606 scsi_in(sc
)->resid
= res_count
;
608 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
611 if (rhdr
->flags
& (ISCSI_FLAG_CMD_UNDERFLOW
|
612 ISCSI_FLAG_CMD_OVERFLOW
)) {
613 int res_count
= be32_to_cpu(rhdr
->residual_count
);
616 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
617 res_count
<= scsi_bufflen(sc
)))
618 /* write side for bidi or uni-io set_resid */
619 scsi_set_resid(sc
, res_count
);
621 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
624 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
625 (long)sc
, sc
->result
, task
->itt
);
626 conn
->scsirsp_pdus_cnt
++;
628 __iscsi_put_task(task
);
631 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
633 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
635 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
636 conn
->tmfrsp_pdus_cnt
++;
638 if (conn
->tmf_state
!= TMF_QUEUED
)
641 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
642 conn
->tmf_state
= TMF_SUCCESS
;
643 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
644 conn
->tmf_state
= TMF_NOT_FOUND
;
646 conn
->tmf_state
= TMF_FAILED
;
647 wake_up(&conn
->ehwait
);
650 static void iscsi_send_nopout(struct iscsi_conn
*conn
, struct iscsi_nopin
*rhdr
)
652 struct iscsi_nopout hdr
;
653 struct iscsi_task
*task
;
655 if (!rhdr
&& conn
->ping_task
)
658 memset(&hdr
, 0, sizeof(struct iscsi_nopout
));
659 hdr
.opcode
= ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
;
660 hdr
.flags
= ISCSI_FLAG_CMD_FINAL
;
663 memcpy(hdr
.lun
, rhdr
->lun
, 8);
665 hdr
.itt
= RESERVED_ITT
;
667 hdr
.ttt
= RESERVED_ITT
;
669 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)&hdr
, NULL
, 0);
671 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send nopout\n");
674 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
675 char *data
, int datalen
)
677 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
678 struct iscsi_hdr rejected_pdu
;
681 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
683 if (reject
->reason
== ISCSI_REASON_DATA_DIGEST_ERROR
) {
684 if (ntoh24(reject
->dlength
) > datalen
)
685 return ISCSI_ERR_PROTO
;
687 if (ntoh24(reject
->dlength
) >= sizeof(struct iscsi_hdr
)) {
688 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
689 itt
= get_itt(rejected_pdu
.itt
);
690 iscsi_conn_printk(KERN_ERR
, conn
,
691 "itt 0x%x had pdu (op 0x%x) rejected "
692 "due to DataDigest error.\n", itt
,
693 rejected_pdu
.opcode
);
700 * __iscsi_complete_pdu - complete pdu
704 * @datalen: len of data buffer
706 * Completes pdu processing by freeing any resources allocated at
707 * queuecommand or send generic. session lock must be held and verify
708 * itt must have been called.
710 static int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
711 char *data
, int datalen
)
713 struct iscsi_session
*session
= conn
->session
;
714 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
715 struct iscsi_task
*task
;
718 conn
->last_recv
= jiffies
;
719 rc
= iscsi_verify_itt(conn
, hdr
->itt
);
723 if (hdr
->itt
!= RESERVED_ITT
)
724 itt
= get_itt(hdr
->itt
);
728 debug_scsi("[op 0x%x cid %d itt 0x%x len %d]\n",
729 opcode
, conn
->id
, itt
, datalen
);
732 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
735 case ISCSI_OP_NOOP_IN
:
737 rc
= ISCSI_ERR_PROTO
;
741 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
744 iscsi_send_nopout(conn
, (struct iscsi_nopin
*)hdr
);
746 case ISCSI_OP_REJECT
:
747 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
749 case ISCSI_OP_ASYNC_EVENT
:
750 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
751 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
752 rc
= ISCSI_ERR_CONN_FAILED
;
755 rc
= ISCSI_ERR_BAD_OPCODE
;
761 task
= session
->cmds
[itt
];
763 case ISCSI_OP_SCSI_CMD_RSP
:
765 rc
= ISCSI_ERR_NO_SCSI_CMD
;
768 BUG_ON((void*)task
!= task
->sc
->SCp
.ptr
);
769 iscsi_scsi_cmd_rsp(conn
, hdr
, task
, data
, datalen
);
771 case ISCSI_OP_SCSI_DATA_IN
:
773 rc
= ISCSI_ERR_NO_SCSI_CMD
;
776 BUG_ON((void*)task
!= task
->sc
->SCp
.ptr
);
777 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
778 conn
->scsirsp_pdus_cnt
++;
779 iscsi_update_cmdsn(session
,
780 (struct iscsi_nopin
*) hdr
);
781 __iscsi_put_task(task
);
785 /* LLD handles this for now */
787 case ISCSI_OP_LOGOUT_RSP
:
788 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
790 rc
= ISCSI_ERR_PROTO
;
793 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
795 case ISCSI_OP_LOGIN_RSP
:
796 case ISCSI_OP_TEXT_RSP
:
797 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
799 * login related PDU's exp_statsn is handled in
803 case ISCSI_OP_SCSI_TMFUNC_RSP
:
804 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
806 rc
= ISCSI_ERR_PROTO
;
810 iscsi_tmf_rsp(conn
, hdr
);
811 __iscsi_put_task(task
);
813 case ISCSI_OP_NOOP_IN
:
814 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
815 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) || datalen
) {
816 rc
= ISCSI_ERR_PROTO
;
819 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
821 if (conn
->ping_task
!= task
)
823 * If this is not in response to one of our
824 * nops then it must be from userspace.
828 mod_timer(&conn
->transport_timer
, jiffies
+ conn
->recv_timeout
);
829 __iscsi_put_task(task
);
832 rc
= ISCSI_ERR_BAD_OPCODE
;
839 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
840 rc
= ISCSI_ERR_CONN_FAILED
;
841 __iscsi_put_task(task
);
845 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
846 char *data
, int datalen
)
850 spin_lock(&conn
->session
->lock
);
851 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
852 spin_unlock(&conn
->session
->lock
);
855 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
857 int iscsi_verify_itt(struct iscsi_conn
*conn
, itt_t itt
)
859 struct iscsi_session
*session
= conn
->session
;
860 struct iscsi_task
*task
;
863 if (itt
== RESERVED_ITT
)
866 if (((__force u32
)itt
& ISCSI_AGE_MASK
) !=
867 (session
->age
<< ISCSI_AGE_SHIFT
)) {
868 iscsi_conn_printk(KERN_ERR
, conn
,
869 "received itt %x expected session age (%x)\n",
871 session
->age
& ISCSI_AGE_MASK
);
872 return ISCSI_ERR_BAD_ITT
;
876 if (i
>= session
->cmds_max
) {
877 iscsi_conn_printk(KERN_ERR
, conn
,
878 "received invalid itt index %u (max cmds "
879 "%u.\n", i
, session
->cmds_max
);
880 return ISCSI_ERR_BAD_ITT
;
883 task
= session
->cmds
[i
];
884 if (task
->sc
&& task
->sc
->SCp
.phase
!= session
->age
) {
885 iscsi_conn_printk(KERN_ERR
, conn
,
886 "iscsi: task's session age %d, "
887 "expected %d\n", task
->sc
->SCp
.phase
,
889 return ISCSI_ERR_SESSION_FAILED
;
893 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
896 iscsi_itt_to_ctask(struct iscsi_conn
*conn
, itt_t itt
)
898 struct iscsi_session
*session
= conn
->session
;
899 struct iscsi_task
*task
;
902 if (iscsi_verify_itt(conn
, itt
))
905 if (itt
== RESERVED_ITT
)
909 if (i
>= session
->cmds_max
)
912 task
= session
->cmds
[i
];
916 if (task
->sc
->SCp
.phase
!= session
->age
)
921 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask
);
923 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
925 struct iscsi_session
*session
= conn
->session
;
928 spin_lock_irqsave(&session
->lock
, flags
);
929 if (session
->state
== ISCSI_STATE_FAILED
) {
930 spin_unlock_irqrestore(&session
->lock
, flags
);
934 if (conn
->stop_stage
== 0)
935 session
->state
= ISCSI_STATE_FAILED
;
936 spin_unlock_irqrestore(&session
->lock
, flags
);
937 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
938 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
939 iscsi_conn_error(conn
->cls_conn
, err
);
941 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
943 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn
*conn
)
945 struct iscsi_session
*session
= conn
->session
;
948 * Check for iSCSI window and take care of CmdSN wrap-around
950 if (!iscsi_sna_lte(session
->queued_cmdsn
, session
->max_cmdsn
)) {
951 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
952 "CmdSN %u/%u\n", session
->exp_cmdsn
,
953 session
->max_cmdsn
, session
->cmdsn
,
954 session
->queued_cmdsn
);
960 static int iscsi_xmit_task(struct iscsi_conn
*conn
)
962 struct iscsi_task
*task
= conn
->task
;
965 __iscsi_get_task(task
);
966 spin_unlock_bh(&conn
->session
->lock
);
967 rc
= conn
->session
->tt
->xmit_task(task
);
968 spin_lock_bh(&conn
->session
->lock
);
969 __iscsi_put_task(task
);
971 /* done with this task */
977 * iscsi_requeue_task - requeue task to run from session workqueue
978 * @task: task to requeue
980 * LLDs that need to run a task from the session workqueue should call
981 * this. The session lock must be held. This should only be called
982 * by software drivers.
984 void iscsi_requeue_task(struct iscsi_task
*task
)
986 struct iscsi_conn
*conn
= task
->conn
;
988 list_move_tail(&task
->running
, &conn
->requeue
);
989 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
991 EXPORT_SYMBOL_GPL(iscsi_requeue_task
);
994 * iscsi_data_xmit - xmit any command into the scheduled connection
995 * @conn: iscsi connection
998 * The function can return -EAGAIN in which case the caller must
999 * re-schedule it again later or recover. '0' return code means
1002 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
1006 spin_lock_bh(&conn
->session
->lock
);
1007 if (unlikely(conn
->suspend_tx
)) {
1008 debug_scsi("conn %d Tx suspended!\n", conn
->id
);
1009 spin_unlock_bh(&conn
->session
->lock
);
1014 rc
= iscsi_xmit_task(conn
);
1020 * process mgmt pdus like nops before commands since we should
1021 * only have one nop-out as a ping from us and targets should not
1022 * overflow us with nop-ins
1025 while (!list_empty(&conn
->mgmtqueue
)) {
1026 conn
->task
= list_entry(conn
->mgmtqueue
.next
,
1027 struct iscsi_task
, running
);
1028 if (iscsi_prep_mgmt_task(conn
, conn
->task
)) {
1029 __iscsi_put_task(conn
->task
);
1033 rc
= iscsi_xmit_task(conn
);
1038 /* process pending command queue */
1039 while (!list_empty(&conn
->xmitqueue
)) {
1040 if (conn
->tmf_state
== TMF_QUEUED
)
1043 conn
->task
= list_entry(conn
->xmitqueue
.next
,
1044 struct iscsi_task
, running
);
1045 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
1046 fail_command(conn
, conn
->task
, DID_IMM_RETRY
<< 16);
1049 if (iscsi_prep_scsi_cmd_pdu(conn
->task
)) {
1050 fail_command(conn
, conn
->task
, DID_ABORT
<< 16);
1053 rc
= iscsi_xmit_task(conn
);
1057 * we could continuously get new task requests so
1058 * we need to check the mgmt queue for nops that need to
1059 * be sent to aviod starvation
1061 if (!list_empty(&conn
->mgmtqueue
))
1065 while (!list_empty(&conn
->requeue
)) {
1066 if (conn
->session
->fast_abort
&& conn
->tmf_state
!= TMF_INITIAL
)
1070 * we always do fastlogout - conn stop code will clean up.
1072 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
1075 conn
->task
= list_entry(conn
->requeue
.next
,
1076 struct iscsi_task
, running
);
1077 conn
->task
->state
= ISCSI_TASK_RUNNING
;
1078 list_move_tail(conn
->requeue
.next
, &conn
->run_list
);
1079 rc
= iscsi_xmit_task(conn
);
1082 if (!list_empty(&conn
->mgmtqueue
))
1085 spin_unlock_bh(&conn
->session
->lock
);
1089 if (unlikely(conn
->suspend_tx
))
1091 spin_unlock_bh(&conn
->session
->lock
);
1095 static void iscsi_xmitworker(struct work_struct
*work
)
1097 struct iscsi_conn
*conn
=
1098 container_of(work
, struct iscsi_conn
, xmitwork
);
1101 * serialize Xmit worker on a per-connection basis.
1104 rc
= iscsi_data_xmit(conn
);
1105 } while (rc
>= 0 || rc
== -EAGAIN
);
1109 FAILURE_BAD_HOST
= 1,
1110 FAILURE_SESSION_FAILED
,
1111 FAILURE_SESSION_FREED
,
1112 FAILURE_WINDOW_CLOSED
,
1114 FAILURE_SESSION_TERMINATE
,
1115 FAILURE_SESSION_IN_RECOVERY
,
1116 FAILURE_SESSION_RECOVERY_TIMEOUT
,
1117 FAILURE_SESSION_LOGGING_OUT
,
1118 FAILURE_SESSION_NOT_READY
,
1121 int iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
1123 struct iscsi_cls_session
*cls_session
;
1124 struct Scsi_Host
*host
;
1126 struct iscsi_session
*session
;
1127 struct iscsi_conn
*conn
;
1128 struct iscsi_task
*task
= NULL
;
1130 sc
->scsi_done
= done
;
1134 host
= sc
->device
->host
;
1135 spin_unlock(host
->host_lock
);
1137 cls_session
= starget_to_session(scsi_target(sc
->device
));
1138 session
= cls_session
->dd_data
;
1139 spin_lock(&session
->lock
);
1141 reason
= iscsi_session_chkready(cls_session
);
1143 sc
->result
= reason
;
1148 * ISCSI_STATE_FAILED is a temp. state. The recovery
1149 * code will decide what is best to do with command queued
1152 if (session
->state
!= ISCSI_STATE_LOGGED_IN
&&
1153 session
->state
!= ISCSI_STATE_FAILED
) {
1155 * to handle the race between when we set the recovery state
1156 * and block the session we requeue here (commands could
1157 * be entering our queuecommand while a block is starting
1158 * up because the block code is not locked)
1160 switch (session
->state
) {
1161 case ISCSI_STATE_IN_RECOVERY
:
1162 reason
= FAILURE_SESSION_IN_RECOVERY
;
1163 sc
->result
= DID_IMM_RETRY
<< 16;
1165 case ISCSI_STATE_LOGGING_OUT
:
1166 reason
= FAILURE_SESSION_LOGGING_OUT
;
1167 sc
->result
= DID_IMM_RETRY
<< 16;
1169 case ISCSI_STATE_RECOVERY_FAILED
:
1170 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
1171 sc
->result
= DID_NO_CONNECT
<< 16;
1173 case ISCSI_STATE_TERMINATE
:
1174 reason
= FAILURE_SESSION_TERMINATE
;
1175 sc
->result
= DID_NO_CONNECT
<< 16;
1178 reason
= FAILURE_SESSION_FREED
;
1179 sc
->result
= DID_NO_CONNECT
<< 16;
1184 conn
= session
->leadconn
;
1186 reason
= FAILURE_SESSION_FREED
;
1187 sc
->result
= DID_NO_CONNECT
<< 16;
1191 if (iscsi_check_cmdsn_window_closed(conn
)) {
1192 reason
= FAILURE_WINDOW_CLOSED
;
1196 if (!__kfifo_get(session
->cmdpool
.queue
, (void*)&task
,
1198 reason
= FAILURE_OOM
;
1201 sc
->SCp
.phase
= session
->age
;
1202 sc
->SCp
.ptr
= (char *)task
;
1204 atomic_set(&task
->refcount
, 1);
1205 task
->state
= ISCSI_TASK_PENDING
;
1208 INIT_LIST_HEAD(&task
->running
);
1209 list_add_tail(&task
->running
, &conn
->xmitqueue
);
1211 if (session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
) {
1212 if (iscsi_prep_scsi_cmd_pdu(task
)) {
1213 sc
->result
= DID_ABORT
<< 16;
1214 sc
->scsi_done
= NULL
;
1215 iscsi_complete_command(task
);
1218 if (session
->tt
->xmit_task(task
)) {
1219 sc
->scsi_done
= NULL
;
1220 iscsi_complete_command(task
);
1221 reason
= FAILURE_SESSION_NOT_READY
;
1225 scsi_queue_work(session
->host
, &conn
->xmitwork
);
1227 session
->queued_cmdsn
++;
1228 spin_unlock(&session
->lock
);
1229 spin_lock(host
->host_lock
);
1233 spin_unlock(&session
->lock
);
1234 debug_scsi("cmd 0x%x rejected (%d)\n", sc
->cmnd
[0], reason
);
1235 spin_lock(host
->host_lock
);
1236 return SCSI_MLQUEUE_HOST_BUSY
;
1239 spin_unlock(&session
->lock
);
1240 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc
->cmnd
[0], reason
);
1241 if (!scsi_bidi_cmnd(sc
))
1242 scsi_set_resid(sc
, scsi_bufflen(sc
));
1244 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
1245 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
1248 spin_lock(host
->host_lock
);
1251 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
1253 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
)
1255 if (depth
> ISCSI_MAX_CMD_PER_LUN
)
1256 depth
= ISCSI_MAX_CMD_PER_LUN
;
1257 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
1258 return sdev
->queue_depth
;
1260 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
1262 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
1264 struct iscsi_session
*session
= cls_session
->dd_data
;
1266 spin_lock_bh(&session
->lock
);
1267 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1268 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
1269 if (session
->leadconn
)
1270 wake_up(&session
->leadconn
->ehwait
);
1272 spin_unlock_bh(&session
->lock
);
1274 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
1276 int iscsi_eh_host_reset(struct scsi_cmnd
*sc
)
1278 struct iscsi_cls_session
*cls_session
;
1279 struct iscsi_session
*session
;
1280 struct iscsi_conn
*conn
;
1282 cls_session
= starget_to_session(scsi_target(sc
->device
));
1283 session
= cls_session
->dd_data
;
1284 conn
= session
->leadconn
;
1286 mutex_lock(&session
->eh_mutex
);
1287 spin_lock_bh(&session
->lock
);
1288 if (session
->state
== ISCSI_STATE_TERMINATE
) {
1290 debug_scsi("failing host reset: session terminated "
1291 "[CID %d age %d]\n", conn
->id
, session
->age
);
1292 spin_unlock_bh(&session
->lock
);
1293 mutex_unlock(&session
->eh_mutex
);
1297 spin_unlock_bh(&session
->lock
);
1298 mutex_unlock(&session
->eh_mutex
);
1300 * we drop the lock here but the leadconn cannot be destoyed while
1301 * we are in the scsi eh
1303 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1305 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1306 wait_event_interruptible(conn
->ehwait
,
1307 session
->state
== ISCSI_STATE_TERMINATE
||
1308 session
->state
== ISCSI_STATE_LOGGED_IN
||
1309 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
1310 if (signal_pending(current
))
1311 flush_signals(current
);
1313 mutex_lock(&session
->eh_mutex
);
1314 spin_lock_bh(&session
->lock
);
1315 if (session
->state
== ISCSI_STATE_LOGGED_IN
)
1316 iscsi_session_printk(KERN_INFO
, session
,
1317 "host reset succeeded\n");
1320 spin_unlock_bh(&session
->lock
);
1321 mutex_unlock(&session
->eh_mutex
);
1324 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset
);
1326 static void iscsi_tmf_timedout(unsigned long data
)
1328 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1329 struct iscsi_session
*session
= conn
->session
;
1331 spin_lock(&session
->lock
);
1332 if (conn
->tmf_state
== TMF_QUEUED
) {
1333 conn
->tmf_state
= TMF_TIMEDOUT
;
1334 debug_scsi("tmf timedout\n");
1335 /* unblock eh_abort() */
1336 wake_up(&conn
->ehwait
);
1338 spin_unlock(&session
->lock
);
1341 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn
*conn
,
1342 struct iscsi_tm
*hdr
, int age
,
1345 struct iscsi_session
*session
= conn
->session
;
1346 struct iscsi_task
*task
;
1348 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)hdr
,
1351 spin_unlock_bh(&session
->lock
);
1352 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1353 spin_lock_bh(&session
->lock
);
1354 debug_scsi("tmf exec failure\n");
1357 conn
->tmfcmd_pdus_cnt
++;
1358 conn
->tmf_timer
.expires
= timeout
* HZ
+ jiffies
;
1359 conn
->tmf_timer
.function
= iscsi_tmf_timedout
;
1360 conn
->tmf_timer
.data
= (unsigned long)conn
;
1361 add_timer(&conn
->tmf_timer
);
1362 debug_scsi("tmf set timeout\n");
1364 spin_unlock_bh(&session
->lock
);
1365 mutex_unlock(&session
->eh_mutex
);
1368 * block eh thread until:
1372 * 3) session is terminated or restarted or userspace has
1373 * given up on recovery
1375 wait_event_interruptible(conn
->ehwait
, age
!= session
->age
||
1376 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1377 conn
->tmf_state
!= TMF_QUEUED
);
1378 if (signal_pending(current
))
1379 flush_signals(current
);
1380 del_timer_sync(&conn
->tmf_timer
);
1382 mutex_lock(&session
->eh_mutex
);
1383 spin_lock_bh(&session
->lock
);
1384 /* if the session drops it will clean up the task */
1385 if (age
!= session
->age
||
1386 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1392 * Fail commands. session lock held and recv side suspended and xmit
1395 static void fail_all_commands(struct iscsi_conn
*conn
, unsigned lun
,
1398 struct iscsi_task
*task
, *tmp
;
1400 if (conn
->task
&& (conn
->task
->sc
->device
->lun
== lun
|| lun
== -1))
1404 list_for_each_entry_safe(task
, tmp
, &conn
->xmitqueue
, running
) {
1405 if (lun
== task
->sc
->device
->lun
|| lun
== -1) {
1406 debug_scsi("failing pending sc %p itt 0x%x\n",
1407 task
->sc
, task
->itt
);
1408 fail_command(conn
, task
, error
<< 16);
1412 list_for_each_entry_safe(task
, tmp
, &conn
->requeue
, running
) {
1413 if (lun
== task
->sc
->device
->lun
|| lun
== -1) {
1414 debug_scsi("failing requeued sc %p itt 0x%x\n",
1415 task
->sc
, task
->itt
);
1416 fail_command(conn
, task
, error
<< 16);
1420 /* fail all other running */
1421 list_for_each_entry_safe(task
, tmp
, &conn
->run_list
, running
) {
1422 if (lun
== task
->sc
->device
->lun
|| lun
== -1) {
1423 debug_scsi("failing in progress sc %p itt 0x%x\n",
1424 task
->sc
, task
->itt
);
1425 fail_command(conn
, task
, DID_BUS_BUSY
<< 16);
1430 void iscsi_suspend_tx(struct iscsi_conn
*conn
)
1432 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1433 if (!(conn
->session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
1434 scsi_flush_work(conn
->session
->host
);
1436 EXPORT_SYMBOL_GPL(iscsi_suspend_tx
);
1438 static void iscsi_start_tx(struct iscsi_conn
*conn
)
1440 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1441 if (!(conn
->session
->tt
->caps
& CAP_DATA_PATH_OFFLOAD
))
1442 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
1445 static enum scsi_eh_timer_return
iscsi_eh_cmd_timed_out(struct scsi_cmnd
*scmd
)
1447 struct iscsi_cls_session
*cls_session
;
1448 struct iscsi_session
*session
;
1449 struct iscsi_conn
*conn
;
1450 enum scsi_eh_timer_return rc
= EH_NOT_HANDLED
;
1452 cls_session
= starget_to_session(scsi_target(scmd
->device
));
1453 session
= cls_session
->dd_data
;
1455 debug_scsi("scsi cmd %p timedout\n", scmd
);
1457 spin_lock(&session
->lock
);
1458 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1460 * We are probably in the middle of iscsi recovery so let
1461 * that complete and handle the error.
1463 rc
= EH_RESET_TIMER
;
1467 conn
= session
->leadconn
;
1469 /* In the middle of shuting down */
1470 rc
= EH_RESET_TIMER
;
1474 if (!conn
->recv_timeout
&& !conn
->ping_timeout
)
1477 * if the ping timedout then we are in the middle of cleaning up
1478 * and can let the iscsi eh handle it
1480 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
) +
1481 (conn
->ping_timeout
* HZ
), jiffies
))
1482 rc
= EH_RESET_TIMER
;
1484 * if we are about to check the transport then give the command
1487 if (time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
),
1489 rc
= EH_RESET_TIMER
;
1490 /* if in the middle of checking the transport then give us more time */
1491 if (conn
->ping_task
)
1492 rc
= EH_RESET_TIMER
;
1494 spin_unlock(&session
->lock
);
1495 debug_scsi("return %s\n", rc
== EH_RESET_TIMER
? "timer reset" : "nh");
1499 static void iscsi_check_transport_timeouts(unsigned long data
)
1501 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1502 struct iscsi_session
*session
= conn
->session
;
1503 unsigned long recv_timeout
, next_timeout
= 0, last_recv
;
1505 spin_lock(&session
->lock
);
1506 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
1509 recv_timeout
= conn
->recv_timeout
;
1514 last_recv
= conn
->last_recv
;
1515 if (conn
->ping_task
&&
1516 time_before_eq(conn
->last_ping
+ (conn
->ping_timeout
* HZ
),
1518 iscsi_conn_printk(KERN_ERR
, conn
, "ping timeout of %d secs "
1519 "expired, last rx %lu, last ping %lu, "
1520 "now %lu\n", conn
->ping_timeout
, last_recv
,
1521 conn
->last_ping
, jiffies
);
1522 spin_unlock(&session
->lock
);
1523 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1527 if (time_before_eq(last_recv
+ recv_timeout
, jiffies
)) {
1528 /* send a ping to try to provoke some traffic */
1529 debug_scsi("Sending nopout as ping on conn %p\n", conn
);
1530 iscsi_send_nopout(conn
, NULL
);
1531 next_timeout
= conn
->last_ping
+ (conn
->ping_timeout
* HZ
);
1533 next_timeout
= last_recv
+ recv_timeout
;
1535 debug_scsi("Setting next tmo %lu\n", next_timeout
);
1536 mod_timer(&conn
->transport_timer
, next_timeout
);
1538 spin_unlock(&session
->lock
);
1541 static void iscsi_prep_abort_task_pdu(struct iscsi_task
*task
,
1542 struct iscsi_tm
*hdr
)
1544 memset(hdr
, 0, sizeof(*hdr
));
1545 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1546 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
& ISCSI_FLAG_TM_FUNC_MASK
;
1547 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1548 memcpy(hdr
->lun
, task
->hdr
->lun
, sizeof(hdr
->lun
));
1549 hdr
->rtt
= task
->hdr
->itt
;
1550 hdr
->refcmdsn
= task
->hdr
->cmdsn
;
1553 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
1555 struct iscsi_cls_session
*cls_session
;
1556 struct iscsi_session
*session
;
1557 struct iscsi_conn
*conn
;
1558 struct iscsi_task
*task
;
1559 struct iscsi_tm
*hdr
;
1562 cls_session
= starget_to_session(scsi_target(sc
->device
));
1563 session
= cls_session
->dd_data
;
1565 mutex_lock(&session
->eh_mutex
);
1566 spin_lock_bh(&session
->lock
);
1568 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1572 debug_scsi("sc never reached iscsi layer or it completed.\n");
1573 spin_unlock_bh(&session
->lock
);
1574 mutex_unlock(&session
->eh_mutex
);
1579 * If we are not logged in or we have started a new session
1580 * then let the host reset code handle this
1582 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
||
1583 sc
->SCp
.phase
!= session
->age
) {
1584 spin_unlock_bh(&session
->lock
);
1585 mutex_unlock(&session
->eh_mutex
);
1589 conn
= session
->leadconn
;
1590 conn
->eh_abort_cnt
++;
1593 task
= (struct iscsi_task
*)sc
->SCp
.ptr
;
1594 debug_scsi("aborting [sc %p itt 0x%x]\n", sc
, task
->itt
);
1596 /* task completed before time out */
1598 debug_scsi("sc completed while abort in progress\n");
1602 if (task
->state
== ISCSI_TASK_PENDING
) {
1603 fail_command(conn
, task
, DID_ABORT
<< 16);
1607 /* only have one tmf outstanding at a time */
1608 if (conn
->tmf_state
!= TMF_INITIAL
)
1610 conn
->tmf_state
= TMF_QUEUED
;
1613 iscsi_prep_abort_task_pdu(task
, hdr
);
1615 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, age
, session
->abort_timeout
)) {
1620 switch (conn
->tmf_state
) {
1622 spin_unlock_bh(&session
->lock
);
1623 iscsi_suspend_tx(conn
);
1625 * clean up task if aborted. grab the recv lock as a writer
1627 write_lock_bh(conn
->recv_lock
);
1628 spin_lock(&session
->lock
);
1629 fail_command(conn
, task
, DID_ABORT
<< 16);
1630 conn
->tmf_state
= TMF_INITIAL
;
1631 spin_unlock(&session
->lock
);
1632 write_unlock_bh(conn
->recv_lock
);
1633 iscsi_start_tx(conn
);
1634 goto success_unlocked
;
1636 spin_unlock_bh(&session
->lock
);
1637 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1638 goto failed_unlocked
;
1641 conn
->tmf_state
= TMF_INITIAL
;
1642 /* task completed before tmf abort response */
1643 debug_scsi("sc completed while abort in progress\n");
1648 conn
->tmf_state
= TMF_INITIAL
;
1653 spin_unlock_bh(&session
->lock
);
1655 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc
, task
->itt
);
1656 mutex_unlock(&session
->eh_mutex
);
1660 spin_unlock_bh(&session
->lock
);
1662 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc
,
1663 task
? task
->itt
: 0);
1664 mutex_unlock(&session
->eh_mutex
);
1667 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
1669 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
1671 memset(hdr
, 0, sizeof(*hdr
));
1672 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1673 hdr
->flags
= ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
1674 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1675 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
1676 hdr
->rtt
= RESERVED_ITT
;
1679 int iscsi_eh_device_reset(struct scsi_cmnd
*sc
)
1681 struct iscsi_cls_session
*cls_session
;
1682 struct iscsi_session
*session
;
1683 struct iscsi_conn
*conn
;
1684 struct iscsi_tm
*hdr
;
1687 cls_session
= starget_to_session(scsi_target(sc
->device
));
1688 session
= cls_session
->dd_data
;
1690 debug_scsi("LU Reset [sc %p lun %u]\n", sc
, sc
->device
->lun
);
1692 mutex_lock(&session
->eh_mutex
);
1693 spin_lock_bh(&session
->lock
);
1695 * Just check if we are not logged in. We cannot check for
1696 * the phase because the reset could come from a ioctl.
1698 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
1700 conn
= session
->leadconn
;
1702 /* only have one tmf outstanding at a time */
1703 if (conn
->tmf_state
!= TMF_INITIAL
)
1705 conn
->tmf_state
= TMF_QUEUED
;
1708 iscsi_prep_lun_reset_pdu(sc
, hdr
);
1710 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
1711 session
->lu_reset_timeout
)) {
1716 switch (conn
->tmf_state
) {
1720 spin_unlock_bh(&session
->lock
);
1721 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1724 conn
->tmf_state
= TMF_INITIAL
;
1729 spin_unlock_bh(&session
->lock
);
1731 iscsi_suspend_tx(conn
);
1732 /* need to grab the recv lock then session lock */
1733 write_lock_bh(conn
->recv_lock
);
1734 spin_lock(&session
->lock
);
1735 fail_all_commands(conn
, sc
->device
->lun
, DID_ERROR
);
1736 conn
->tmf_state
= TMF_INITIAL
;
1737 spin_unlock(&session
->lock
);
1738 write_unlock_bh(conn
->recv_lock
);
1740 iscsi_start_tx(conn
);
1744 spin_unlock_bh(&session
->lock
);
1746 debug_scsi("iscsi_eh_device_reset %s\n",
1747 rc
== SUCCESS
? "SUCCESS" : "FAILED");
1748 mutex_unlock(&session
->eh_mutex
);
1751 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset
);
1754 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1755 * should be accessed via kfifo_{get,put} on q->queue.
1756 * Optionally, the caller can obtain the array of object pointers
1757 * by passing in a non-NULL @items pointer
1760 iscsi_pool_init(struct iscsi_pool
*q
, int max
, void ***items
, int item_size
)
1762 int i
, num_arrays
= 1;
1764 memset(q
, 0, sizeof(*q
));
1768 /* If the user passed an items pointer, he wants a copy of
1772 q
->pool
= kzalloc(num_arrays
* max
* sizeof(void*), GFP_KERNEL
);
1773 if (q
->pool
== NULL
)
1776 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
1778 if (q
->queue
== ERR_PTR(-ENOMEM
))
1781 for (i
= 0; i
< max
; i
++) {
1782 q
->pool
[i
] = kzalloc(item_size
, GFP_KERNEL
);
1783 if (q
->pool
[i
] == NULL
) {
1787 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
1791 *items
= q
->pool
+ max
;
1792 memcpy(*items
, q
->pool
, max
* sizeof(void *));
1801 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
1803 void iscsi_pool_free(struct iscsi_pool
*q
)
1807 for (i
= 0; i
< q
->max
; i
++)
1812 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
1815 * iscsi_host_add - add host to system
1817 * @pdev: parent device
1819 * This should be called by partial offload and software iscsi drivers
1820 * to add a host to the system.
1822 int iscsi_host_add(struct Scsi_Host
*shost
, struct device
*pdev
)
1824 return scsi_add_host(shost
, pdev
);
1826 EXPORT_SYMBOL_GPL(iscsi_host_add
);
1829 * iscsi_host_alloc - allocate a host and driver data
1830 * @sht: scsi host template
1831 * @dd_data_size: driver host data size
1832 * @qdepth: default device queue depth
1834 * This should be called by partial offload and software iscsi drivers.
1835 * To access the driver specific memory use the iscsi_host_priv() macro.
1837 struct Scsi_Host
*iscsi_host_alloc(struct scsi_host_template
*sht
,
1838 int dd_data_size
, uint16_t qdepth
)
1840 struct Scsi_Host
*shost
;
1842 shost
= scsi_host_alloc(sht
, sizeof(struct iscsi_host
) + dd_data_size
);
1845 shost
->transportt
->eh_timed_out
= iscsi_eh_cmd_timed_out
;
1847 if (qdepth
> ISCSI_MAX_CMD_PER_LUN
|| qdepth
< 1) {
1849 printk(KERN_ERR
"iscsi: invalid queue depth of %d. "
1850 "Queue depth must be between 1 and %d.\n",
1851 qdepth
, ISCSI_MAX_CMD_PER_LUN
);
1852 qdepth
= ISCSI_DEF_CMD_PER_LUN
;
1854 shost
->cmd_per_lun
= qdepth
;
1857 EXPORT_SYMBOL_GPL(iscsi_host_alloc
);
1860 * iscsi_host_remove - remove host and sessions
1863 * This will also remove any sessions attached to the host, but if userspace
1864 * is managing the session at the same time this will break. TODO: add
1865 * refcounting to the netlink iscsi interface so a rmmod or host hot unplug
1866 * does not remove the memory from under us.
1868 void iscsi_host_remove(struct Scsi_Host
*shost
)
1870 iscsi_host_for_each_session(shost
, iscsi_session_teardown
);
1871 scsi_remove_host(shost
);
1873 EXPORT_SYMBOL_GPL(iscsi_host_remove
);
1875 void iscsi_host_free(struct Scsi_Host
*shost
)
1877 struct iscsi_host
*ihost
= shost_priv(shost
);
1879 kfree(ihost
->netdev
);
1880 kfree(ihost
->hwaddress
);
1881 kfree(ihost
->initiatorname
);
1882 scsi_host_put(shost
);
1884 EXPORT_SYMBOL_GPL(iscsi_host_free
);
1887 * iscsi_session_setup - create iscsi cls session and host and session
1888 * @iscsit: iscsi transport template
1890 * @cmds_max: session can queue
1891 * @cmd_task_size: LLD task private data size
1892 * @initial_cmdsn: initial CmdSN
1894 * This can be used by software iscsi_transports that allocate
1895 * a session per scsi host.
1897 struct iscsi_cls_session
*
1898 iscsi_session_setup(struct iscsi_transport
*iscsit
, struct Scsi_Host
*shost
,
1899 uint16_t scsi_cmds_max
, int cmd_task_size
,
1900 uint32_t initial_cmdsn
)
1902 struct iscsi_session
*session
;
1903 struct iscsi_cls_session
*cls_session
;
1904 int cmd_i
, cmds_max
;
1907 * The iscsi layer needs some tasks for nop handling and tmfs.
1909 if (scsi_cmds_max
< 1)
1910 scsi_cmds_max
= ISCSI_MGMT_CMDS_MAX
;
1911 if ((scsi_cmds_max
+ ISCSI_MGMT_CMDS_MAX
) >= ISCSI_MGMT_ITT_OFFSET
) {
1912 printk(KERN_ERR
"iscsi: invalid can_queue of %d. "
1913 "can_queue must be less than %d.\n",
1915 ISCSI_MGMT_ITT_OFFSET
- ISCSI_MGMT_CMDS_MAX
);
1916 scsi_cmds_max
= ISCSI_DEF_XMIT_CMDS_MAX
;
1918 cmds_max
= roundup_pow_of_two(scsi_cmds_max
+ ISCSI_MGMT_CMDS_MAX
);
1920 cls_session
= iscsi_alloc_session(shost
, iscsit
,
1921 sizeof(struct iscsi_session
));
1924 session
= cls_session
->dd_data
;
1925 session
->cls_session
= cls_session
;
1926 session
->host
= shost
;
1927 session
->state
= ISCSI_STATE_FREE
;
1928 session
->fast_abort
= 1;
1929 session
->lu_reset_timeout
= 15;
1930 session
->abort_timeout
= 10;
1931 session
->scsi_cmds_max
= scsi_cmds_max
;
1932 session
->cmds_max
= cmds_max
;
1933 session
->queued_cmdsn
= session
->cmdsn
= initial_cmdsn
;
1934 session
->exp_cmdsn
= initial_cmdsn
+ 1;
1935 session
->max_cmdsn
= initial_cmdsn
+ 1;
1936 session
->max_r2t
= 1;
1937 session
->tt
= iscsit
;
1938 mutex_init(&session
->eh_mutex
);
1939 spin_lock_init(&session
->lock
);
1941 /* initialize SCSI PDU commands pool */
1942 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
1943 (void***)&session
->cmds
,
1944 cmd_task_size
+ sizeof(struct iscsi_task
)))
1945 goto cmdpool_alloc_fail
;
1947 /* pre-format cmds pool with ITT */
1948 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
1949 struct iscsi_task
*task
= session
->cmds
[cmd_i
];
1952 task
->dd_data
= &task
[1];
1954 INIT_LIST_HEAD(&task
->running
);
1957 if (!try_module_get(iscsit
->owner
))
1958 goto module_get_fail
;
1960 if (iscsi_add_session(cls_session
, 0))
1961 goto cls_session_fail
;
1965 module_put(iscsit
->owner
);
1967 iscsi_pool_free(&session
->cmdpool
);
1969 iscsi_free_session(cls_session
);
1972 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
1975 * iscsi_session_teardown - destroy session, host, and cls_session
1976 * @cls_session: iscsi session
1978 * The driver must have called iscsi_remove_session before
1981 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
1983 struct iscsi_session
*session
= cls_session
->dd_data
;
1984 struct module
*owner
= cls_session
->transport
->owner
;
1986 iscsi_pool_free(&session
->cmdpool
);
1988 kfree(session
->password
);
1989 kfree(session
->password_in
);
1990 kfree(session
->username
);
1991 kfree(session
->username_in
);
1992 kfree(session
->targetname
);
1994 iscsi_destroy_session(cls_session
);
1997 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
2000 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2001 * @cls_session: iscsi_cls_session
2002 * @dd_size: private driver data size
2005 struct iscsi_cls_conn
*
2006 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, int dd_size
,
2009 struct iscsi_session
*session
= cls_session
->dd_data
;
2010 struct iscsi_conn
*conn
;
2011 struct iscsi_cls_conn
*cls_conn
;
2014 cls_conn
= iscsi_create_conn(cls_session
, sizeof(*conn
) + dd_size
,
2018 conn
= cls_conn
->dd_data
;
2019 memset(conn
, 0, sizeof(*conn
) + dd_size
);
2021 conn
->dd_data
= cls_conn
->dd_data
+ sizeof(*conn
);
2022 conn
->session
= session
;
2023 conn
->cls_conn
= cls_conn
;
2024 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
2025 conn
->id
= conn_idx
;
2026 conn
->exp_statsn
= 0;
2027 conn
->tmf_state
= TMF_INITIAL
;
2029 init_timer(&conn
->transport_timer
);
2030 conn
->transport_timer
.data
= (unsigned long)conn
;
2031 conn
->transport_timer
.function
= iscsi_check_transport_timeouts
;
2033 INIT_LIST_HEAD(&conn
->run_list
);
2034 INIT_LIST_HEAD(&conn
->mgmt_run_list
);
2035 INIT_LIST_HEAD(&conn
->mgmtqueue
);
2036 INIT_LIST_HEAD(&conn
->xmitqueue
);
2037 INIT_LIST_HEAD(&conn
->requeue
);
2038 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
2040 /* allocate login_task used for the login/text sequences */
2041 spin_lock_bh(&session
->lock
);
2042 if (!__kfifo_get(session
->cmdpool
.queue
,
2043 (void*)&conn
->login_task
,
2045 spin_unlock_bh(&session
->lock
);
2046 goto login_task_alloc_fail
;
2048 spin_unlock_bh(&session
->lock
);
2050 data
= kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN
, GFP_KERNEL
);
2052 goto login_task_data_alloc_fail
;
2053 conn
->login_task
->data
= conn
->data
= data
;
2055 init_timer(&conn
->tmf_timer
);
2056 init_waitqueue_head(&conn
->ehwait
);
2060 login_task_data_alloc_fail
:
2061 __kfifo_put(session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2063 login_task_alloc_fail
:
2064 iscsi_destroy_conn(cls_conn
);
2067 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
2070 * iscsi_conn_teardown - teardown iscsi connection
2071 * cls_conn: iscsi class connection
2073 * TODO: we may need to make this into a two step process
2074 * like scsi-mls remove + put host
2076 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
2078 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2079 struct iscsi_session
*session
= conn
->session
;
2080 unsigned long flags
;
2082 del_timer_sync(&conn
->transport_timer
);
2084 spin_lock_bh(&session
->lock
);
2085 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
2086 if (session
->leadconn
== conn
) {
2088 * leading connection? then give up on recovery.
2090 session
->state
= ISCSI_STATE_TERMINATE
;
2091 wake_up(&conn
->ehwait
);
2093 spin_unlock_bh(&session
->lock
);
2096 * Block until all in-progress commands for this connection
2100 spin_lock_irqsave(session
->host
->host_lock
, flags
);
2101 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
2102 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2105 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2106 msleep_interruptible(500);
2107 iscsi_conn_printk(KERN_INFO
, conn
, "iscsi conn_destroy(): "
2108 "host_busy %d host_failed %d\n",
2109 session
->host
->host_busy
,
2110 session
->host
->host_failed
);
2112 * force eh_abort() to unblock
2114 wake_up(&conn
->ehwait
);
2117 /* flush queued up work because we free the connection below */
2118 iscsi_suspend_tx(conn
);
2120 spin_lock_bh(&session
->lock
);
2122 kfree(conn
->persistent_address
);
2123 __kfifo_put(session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2125 if (session
->leadconn
== conn
)
2126 session
->leadconn
= NULL
;
2127 spin_unlock_bh(&session
->lock
);
2129 iscsi_destroy_conn(cls_conn
);
2131 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
2133 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
2135 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2136 struct iscsi_session
*session
= conn
->session
;
2139 iscsi_conn_printk(KERN_ERR
, conn
,
2140 "can't start unbound connection\n");
2144 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
2145 session
->first_burst
> session
->max_burst
) {
2146 iscsi_conn_printk(KERN_INFO
, conn
, "invalid burst lengths: "
2147 "first_burst %d max_burst %d\n",
2148 session
->first_burst
, session
->max_burst
);
2152 if (conn
->ping_timeout
&& !conn
->recv_timeout
) {
2153 iscsi_conn_printk(KERN_ERR
, conn
, "invalid recv timeout of "
2154 "zero. Using 5 seconds\n.");
2155 conn
->recv_timeout
= 5;
2158 if (conn
->recv_timeout
&& !conn
->ping_timeout
) {
2159 iscsi_conn_printk(KERN_ERR
, conn
, "invalid ping timeout of "
2160 "zero. Using 5 seconds.\n");
2161 conn
->ping_timeout
= 5;
2164 spin_lock_bh(&session
->lock
);
2165 conn
->c_stage
= ISCSI_CONN_STARTED
;
2166 session
->state
= ISCSI_STATE_LOGGED_IN
;
2167 session
->queued_cmdsn
= session
->cmdsn
;
2169 conn
->last_recv
= jiffies
;
2170 conn
->last_ping
= jiffies
;
2171 if (conn
->recv_timeout
&& conn
->ping_timeout
)
2172 mod_timer(&conn
->transport_timer
,
2173 jiffies
+ (conn
->recv_timeout
* HZ
));
2175 switch(conn
->stop_stage
) {
2176 case STOP_CONN_RECOVER
:
2178 * unblock eh_abort() if it is blocked. re-try all
2179 * commands after successful recovery
2181 conn
->stop_stage
= 0;
2182 conn
->tmf_state
= TMF_INITIAL
;
2184 if (session
->age
== 16)
2187 case STOP_CONN_TERM
:
2188 conn
->stop_stage
= 0;
2193 spin_unlock_bh(&session
->lock
);
2195 iscsi_unblock_session(session
->cls_session
);
2196 wake_up(&conn
->ehwait
);
2199 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
2202 flush_control_queues(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
2204 struct iscsi_task
*task
, *tmp
;
2206 /* handle pending */
2207 list_for_each_entry_safe(task
, tmp
, &conn
->mgmtqueue
, running
) {
2208 debug_scsi("flushing pending mgmt task itt 0x%x\n", task
->itt
);
2209 /* release ref from prep task */
2210 __iscsi_put_task(task
);
2213 /* handle running */
2214 list_for_each_entry_safe(task
, tmp
, &conn
->mgmt_run_list
, running
) {
2215 debug_scsi("flushing running mgmt task itt 0x%x\n", task
->itt
);
2216 /* release ref from prep task */
2217 __iscsi_put_task(task
);
2223 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
2224 struct iscsi_conn
*conn
, int flag
)
2228 del_timer_sync(&conn
->transport_timer
);
2230 mutex_lock(&session
->eh_mutex
);
2231 spin_lock_bh(&session
->lock
);
2232 if (conn
->stop_stage
== STOP_CONN_TERM
) {
2233 spin_unlock_bh(&session
->lock
);
2234 mutex_unlock(&session
->eh_mutex
);
2239 * The LLD either freed/unset the lock on us, or userspace called
2240 * stop but did not create a proper connection (connection was never
2241 * bound or it was unbound then stop was called).
2243 if (!conn
->recv_lock
) {
2244 spin_unlock_bh(&session
->lock
);
2245 mutex_unlock(&session
->eh_mutex
);
2250 * When this is called for the in_login state, we only want to clean
2251 * up the login task and connection. We do not need to block and set
2252 * the recovery state again
2254 if (flag
== STOP_CONN_TERM
)
2255 session
->state
= ISCSI_STATE_TERMINATE
;
2256 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
2257 session
->state
= ISCSI_STATE_IN_RECOVERY
;
2259 old_stop_stage
= conn
->stop_stage
;
2260 conn
->stop_stage
= flag
;
2261 conn
->c_stage
= ISCSI_CONN_STOPPED
;
2262 spin_unlock_bh(&session
->lock
);
2264 iscsi_suspend_tx(conn
);
2266 write_lock_bh(conn
->recv_lock
);
2267 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
2268 write_unlock_bh(conn
->recv_lock
);
2271 * for connection level recovery we should not calculate
2272 * header digest. conn->hdr_size used for optimization
2273 * in hdr_extract() and will be re-negotiated at
2276 if (flag
== STOP_CONN_RECOVER
) {
2277 conn
->hdrdgst_en
= 0;
2278 conn
->datadgst_en
= 0;
2279 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
2280 old_stop_stage
!= STOP_CONN_RECOVER
) {
2281 debug_scsi("blocking session\n");
2282 iscsi_block_session(session
->cls_session
);
2289 spin_lock_bh(&session
->lock
);
2290 fail_all_commands(conn
, -1,
2291 STOP_CONN_RECOVER
? DID_BUS_BUSY
: DID_ERROR
);
2292 flush_control_queues(session
, conn
);
2293 spin_unlock_bh(&session
->lock
);
2294 mutex_unlock(&session
->eh_mutex
);
2297 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
2299 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2300 struct iscsi_session
*session
= conn
->session
;
2303 case STOP_CONN_RECOVER
:
2304 case STOP_CONN_TERM
:
2305 iscsi_start_session_recovery(session
, conn
, flag
);
2308 iscsi_conn_printk(KERN_ERR
, conn
,
2309 "invalid stop flag %d\n", flag
);
2312 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
2314 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
2315 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
2317 struct iscsi_session
*session
= cls_session
->dd_data
;
2318 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2320 spin_lock_bh(&session
->lock
);
2322 session
->leadconn
= conn
;
2323 spin_unlock_bh(&session
->lock
);
2326 * Unblock xmitworker(), Login Phase will pass through.
2328 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
2329 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
2332 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
2335 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
2336 enum iscsi_param param
, char *buf
, int buflen
)
2338 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2339 struct iscsi_session
*session
= conn
->session
;
2343 case ISCSI_PARAM_FAST_ABORT
:
2344 sscanf(buf
, "%d", &session
->fast_abort
);
2346 case ISCSI_PARAM_ABORT_TMO
:
2347 sscanf(buf
, "%d", &session
->abort_timeout
);
2349 case ISCSI_PARAM_LU_RESET_TMO
:
2350 sscanf(buf
, "%d", &session
->lu_reset_timeout
);
2352 case ISCSI_PARAM_PING_TMO
:
2353 sscanf(buf
, "%d", &conn
->ping_timeout
);
2355 case ISCSI_PARAM_RECV_TMO
:
2356 sscanf(buf
, "%d", &conn
->recv_timeout
);
2358 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2359 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
2361 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2362 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
2364 case ISCSI_PARAM_HDRDGST_EN
:
2365 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
2367 case ISCSI_PARAM_DATADGST_EN
:
2368 sscanf(buf
, "%d", &conn
->datadgst_en
);
2370 case ISCSI_PARAM_INITIAL_R2T_EN
:
2371 sscanf(buf
, "%d", &session
->initial_r2t_en
);
2373 case ISCSI_PARAM_MAX_R2T
:
2374 sscanf(buf
, "%d", &session
->max_r2t
);
2376 case ISCSI_PARAM_IMM_DATA_EN
:
2377 sscanf(buf
, "%d", &session
->imm_data_en
);
2379 case ISCSI_PARAM_FIRST_BURST
:
2380 sscanf(buf
, "%d", &session
->first_burst
);
2382 case ISCSI_PARAM_MAX_BURST
:
2383 sscanf(buf
, "%d", &session
->max_burst
);
2385 case ISCSI_PARAM_PDU_INORDER_EN
:
2386 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
2388 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2389 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
2391 case ISCSI_PARAM_ERL
:
2392 sscanf(buf
, "%d", &session
->erl
);
2394 case ISCSI_PARAM_IFMARKER_EN
:
2395 sscanf(buf
, "%d", &value
);
2398 case ISCSI_PARAM_OFMARKER_EN
:
2399 sscanf(buf
, "%d", &value
);
2402 case ISCSI_PARAM_EXP_STATSN
:
2403 sscanf(buf
, "%u", &conn
->exp_statsn
);
2405 case ISCSI_PARAM_USERNAME
:
2406 kfree(session
->username
);
2407 session
->username
= kstrdup(buf
, GFP_KERNEL
);
2408 if (!session
->username
)
2411 case ISCSI_PARAM_USERNAME_IN
:
2412 kfree(session
->username_in
);
2413 session
->username_in
= kstrdup(buf
, GFP_KERNEL
);
2414 if (!session
->username_in
)
2417 case ISCSI_PARAM_PASSWORD
:
2418 kfree(session
->password
);
2419 session
->password
= kstrdup(buf
, GFP_KERNEL
);
2420 if (!session
->password
)
2423 case ISCSI_PARAM_PASSWORD_IN
:
2424 kfree(session
->password_in
);
2425 session
->password_in
= kstrdup(buf
, GFP_KERNEL
);
2426 if (!session
->password_in
)
2429 case ISCSI_PARAM_TARGET_NAME
:
2430 /* this should not change between logins */
2431 if (session
->targetname
)
2434 session
->targetname
= kstrdup(buf
, GFP_KERNEL
);
2435 if (!session
->targetname
)
2438 case ISCSI_PARAM_TPGT
:
2439 sscanf(buf
, "%d", &session
->tpgt
);
2441 case ISCSI_PARAM_PERSISTENT_PORT
:
2442 sscanf(buf
, "%d", &conn
->persistent_port
);
2444 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2446 * this is the address returned in discovery so it should
2447 * not change between logins.
2449 if (conn
->persistent_address
)
2452 conn
->persistent_address
= kstrdup(buf
, GFP_KERNEL
);
2453 if (!conn
->persistent_address
)
2462 EXPORT_SYMBOL_GPL(iscsi_set_param
);
2464 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
2465 enum iscsi_param param
, char *buf
)
2467 struct iscsi_session
*session
= cls_session
->dd_data
;
2471 case ISCSI_PARAM_FAST_ABORT
:
2472 len
= sprintf(buf
, "%d\n", session
->fast_abort
);
2474 case ISCSI_PARAM_ABORT_TMO
:
2475 len
= sprintf(buf
, "%d\n", session
->abort_timeout
);
2477 case ISCSI_PARAM_LU_RESET_TMO
:
2478 len
= sprintf(buf
, "%d\n", session
->lu_reset_timeout
);
2480 case ISCSI_PARAM_INITIAL_R2T_EN
:
2481 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
2483 case ISCSI_PARAM_MAX_R2T
:
2484 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
2486 case ISCSI_PARAM_IMM_DATA_EN
:
2487 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
2489 case ISCSI_PARAM_FIRST_BURST
:
2490 len
= sprintf(buf
, "%u\n", session
->first_burst
);
2492 case ISCSI_PARAM_MAX_BURST
:
2493 len
= sprintf(buf
, "%u\n", session
->max_burst
);
2495 case ISCSI_PARAM_PDU_INORDER_EN
:
2496 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
2498 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
2499 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
2501 case ISCSI_PARAM_ERL
:
2502 len
= sprintf(buf
, "%d\n", session
->erl
);
2504 case ISCSI_PARAM_TARGET_NAME
:
2505 len
= sprintf(buf
, "%s\n", session
->targetname
);
2507 case ISCSI_PARAM_TPGT
:
2508 len
= sprintf(buf
, "%d\n", session
->tpgt
);
2510 case ISCSI_PARAM_USERNAME
:
2511 len
= sprintf(buf
, "%s\n", session
->username
);
2513 case ISCSI_PARAM_USERNAME_IN
:
2514 len
= sprintf(buf
, "%s\n", session
->username_in
);
2516 case ISCSI_PARAM_PASSWORD
:
2517 len
= sprintf(buf
, "%s\n", session
->password
);
2519 case ISCSI_PARAM_PASSWORD_IN
:
2520 len
= sprintf(buf
, "%s\n", session
->password_in
);
2528 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
2530 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
2531 enum iscsi_param param
, char *buf
)
2533 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2537 case ISCSI_PARAM_PING_TMO
:
2538 len
= sprintf(buf
, "%u\n", conn
->ping_timeout
);
2540 case ISCSI_PARAM_RECV_TMO
:
2541 len
= sprintf(buf
, "%u\n", conn
->recv_timeout
);
2543 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
2544 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
2546 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
2547 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
2549 case ISCSI_PARAM_HDRDGST_EN
:
2550 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
2552 case ISCSI_PARAM_DATADGST_EN
:
2553 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
2555 case ISCSI_PARAM_IFMARKER_EN
:
2556 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
2558 case ISCSI_PARAM_OFMARKER_EN
:
2559 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
2561 case ISCSI_PARAM_EXP_STATSN
:
2562 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
2564 case ISCSI_PARAM_PERSISTENT_PORT
:
2565 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
2567 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
2568 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
2576 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
2578 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2581 struct iscsi_host
*ihost
= shost_priv(shost
);
2585 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2587 len
= sprintf(buf
, "%s\n", "default");
2589 len
= sprintf(buf
, "%s\n", ihost
->netdev
);
2591 case ISCSI_HOST_PARAM_HWADDRESS
:
2592 if (!ihost
->hwaddress
)
2593 len
= sprintf(buf
, "%s\n", "default");
2595 len
= sprintf(buf
, "%s\n", ihost
->hwaddress
);
2597 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2598 if (!ihost
->initiatorname
)
2599 len
= sprintf(buf
, "%s\n", "unknown");
2601 len
= sprintf(buf
, "%s\n", ihost
->initiatorname
);
2603 case ISCSI_HOST_PARAM_IPADDRESS
:
2604 if (!strlen(ihost
->local_address
))
2605 len
= sprintf(buf
, "%s\n", "unknown");
2607 len
= sprintf(buf
, "%s\n",
2608 ihost
->local_address
);
2615 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
2617 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2618 char *buf
, int buflen
)
2620 struct iscsi_host
*ihost
= shost_priv(shost
);
2623 case ISCSI_HOST_PARAM_NETDEV_NAME
:
2625 ihost
->netdev
= kstrdup(buf
, GFP_KERNEL
);
2627 case ISCSI_HOST_PARAM_HWADDRESS
:
2628 if (!ihost
->hwaddress
)
2629 ihost
->hwaddress
= kstrdup(buf
, GFP_KERNEL
);
2631 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
2632 if (!ihost
->initiatorname
)
2633 ihost
->initiatorname
= kstrdup(buf
, GFP_KERNEL
);
2641 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
2643 MODULE_AUTHOR("Mike Christie");
2644 MODULE_DESCRIPTION("iSCSI library functions");
2645 MODULE_LICENSE("GPL");