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 <linux/slab.h>
29 #include <linux/module.h>
30 #include <asm/unaligned.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_eh.h>
35 #include <scsi/scsi_tcq.h>
36 #include <scsi/scsi_host.h>
37 #include <scsi/scsi.h>
38 #include <scsi/iscsi_proto.h>
39 #include <scsi/scsi_transport.h>
40 #include <scsi/scsi_transport_iscsi.h>
41 #include <scsi/libiscsi.h>
43 static int iscsi_dbg_lib_conn
;
44 module_param_named(debug_libiscsi_conn
, iscsi_dbg_lib_conn
, int,
46 MODULE_PARM_DESC(debug_libiscsi_conn
,
47 "Turn on debugging for connections in libiscsi module. "
48 "Set to 1 to turn on, and zero to turn off. Default is off.");
50 static int iscsi_dbg_lib_session
;
51 module_param_named(debug_libiscsi_session
, iscsi_dbg_lib_session
, int,
53 MODULE_PARM_DESC(debug_libiscsi_session
,
54 "Turn on debugging for sessions in libiscsi module. "
55 "Set to 1 to turn on, and zero to turn off. Default is off.");
57 static int iscsi_dbg_lib_eh
;
58 module_param_named(debug_libiscsi_eh
, iscsi_dbg_lib_eh
, int,
60 MODULE_PARM_DESC(debug_libiscsi_eh
,
61 "Turn on debugging for error handling in libiscsi module. "
62 "Set to 1 to turn on, and zero to turn off. Default is off.");
64 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
66 if (iscsi_dbg_lib_conn) \
67 iscsi_conn_printk(KERN_INFO, _conn, \
72 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
74 if (iscsi_dbg_lib_session) \
75 iscsi_session_printk(KERN_INFO, _session, \
80 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
82 if (iscsi_dbg_lib_eh) \
83 iscsi_session_printk(KERN_INFO, _session, \
88 inline void iscsi_conn_queue_work(struct iscsi_conn
*conn
)
90 struct Scsi_Host
*shost
= conn
->session
->host
;
91 struct iscsi_host
*ihost
= shost_priv(shost
);
94 queue_work(ihost
->workq
, &conn
->xmitwork
);
96 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work
);
98 static void __iscsi_update_cmdsn(struct iscsi_session
*session
,
99 uint32_t exp_cmdsn
, uint32_t max_cmdsn
)
102 * standard specifies this check for when to update expected and
103 * max sequence numbers
105 if (iscsi_sna_lt(max_cmdsn
, exp_cmdsn
- 1))
108 if (exp_cmdsn
!= session
->exp_cmdsn
&&
109 !iscsi_sna_lt(exp_cmdsn
, session
->exp_cmdsn
))
110 session
->exp_cmdsn
= exp_cmdsn
;
112 if (max_cmdsn
!= session
->max_cmdsn
&&
113 !iscsi_sna_lt(max_cmdsn
, session
->max_cmdsn
))
114 session
->max_cmdsn
= max_cmdsn
;
117 void iscsi_update_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
119 __iscsi_update_cmdsn(session
, be32_to_cpu(hdr
->exp_cmdsn
),
120 be32_to_cpu(hdr
->max_cmdsn
));
122 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn
);
125 * iscsi_prep_data_out_pdu - initialize Data-Out
126 * @task: scsi command task
128 * @hdr: iscsi data in pdu
131 * Initialize Data-Out within this R2T sequence and finds
132 * proper data_offset within this SCSI command.
134 * This function is called with connection lock taken.
136 void iscsi_prep_data_out_pdu(struct iscsi_task
*task
, struct iscsi_r2t_info
*r2t
,
137 struct iscsi_data
*hdr
)
139 struct iscsi_conn
*conn
= task
->conn
;
140 unsigned int left
= r2t
->data_length
- r2t
->sent
;
142 task
->hdr_len
= sizeof(struct iscsi_data
);
144 memset(hdr
, 0, sizeof(struct iscsi_data
));
146 hdr
->datasn
= cpu_to_be32(r2t
->datasn
);
148 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
149 hdr
->lun
= task
->lun
;
150 hdr
->itt
= task
->hdr_itt
;
151 hdr
->exp_statsn
= r2t
->exp_statsn
;
152 hdr
->offset
= cpu_to_be32(r2t
->data_offset
+ r2t
->sent
);
153 if (left
> conn
->max_xmit_dlength
) {
154 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
155 r2t
->data_count
= conn
->max_xmit_dlength
;
158 hton24(hdr
->dlength
, left
);
159 r2t
->data_count
= left
;
160 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
162 conn
->dataout_pdus_cnt
++;
164 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu
);
166 static int iscsi_add_hdr(struct iscsi_task
*task
, unsigned len
)
168 unsigned exp_len
= task
->hdr_len
+ len
;
170 if (exp_len
> task
->hdr_max
) {
175 WARN_ON(len
& (ISCSI_PAD_LEN
- 1)); /* caller must pad the AHS */
176 task
->hdr_len
= exp_len
;
181 * make an extended cdb AHS
183 static int iscsi_prep_ecdb_ahs(struct iscsi_task
*task
)
185 struct scsi_cmnd
*cmd
= task
->sc
;
186 unsigned rlen
, pad_len
;
187 unsigned short ahslength
;
188 struct iscsi_ecdb_ahdr
*ecdb_ahdr
;
191 ecdb_ahdr
= iscsi_next_hdr(task
);
192 rlen
= cmd
->cmd_len
- ISCSI_CDB_SIZE
;
194 BUG_ON(rlen
> sizeof(ecdb_ahdr
->ecdb
));
195 ahslength
= rlen
+ sizeof(ecdb_ahdr
->reserved
);
197 pad_len
= iscsi_padding(rlen
);
199 rc
= iscsi_add_hdr(task
, sizeof(ecdb_ahdr
->ahslength
) +
200 sizeof(ecdb_ahdr
->ahstype
) + ahslength
+ pad_len
);
205 memset(&ecdb_ahdr
->ecdb
[rlen
], 0, pad_len
);
207 ecdb_ahdr
->ahslength
= cpu_to_be16(ahslength
);
208 ecdb_ahdr
->ahstype
= ISCSI_AHSTYPE_CDB
;
209 ecdb_ahdr
->reserved
= 0;
210 memcpy(ecdb_ahdr
->ecdb
, cmd
->cmnd
+ ISCSI_CDB_SIZE
, rlen
);
212 ISCSI_DBG_SESSION(task
->conn
->session
,
213 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
214 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
215 "%u\n", cmd
->cmd_len
, rlen
, pad_len
, ahslength
,
220 static int iscsi_prep_bidi_ahs(struct iscsi_task
*task
)
222 struct scsi_cmnd
*sc
= task
->sc
;
223 struct iscsi_rlength_ahdr
*rlen_ahdr
;
226 rlen_ahdr
= iscsi_next_hdr(task
);
227 rc
= iscsi_add_hdr(task
, sizeof(*rlen_ahdr
));
231 rlen_ahdr
->ahslength
=
232 cpu_to_be16(sizeof(rlen_ahdr
->read_length
) +
233 sizeof(rlen_ahdr
->reserved
));
234 rlen_ahdr
->ahstype
= ISCSI_AHSTYPE_RLENGTH
;
235 rlen_ahdr
->reserved
= 0;
236 rlen_ahdr
->read_length
= cpu_to_be32(scsi_in(sc
)->length
);
238 ISCSI_DBG_SESSION(task
->conn
->session
,
239 "bidi-in rlen_ahdr->read_length(%d) "
240 "rlen_ahdr->ahslength(%d)\n",
241 be32_to_cpu(rlen_ahdr
->read_length
),
242 be16_to_cpu(rlen_ahdr
->ahslength
));
247 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
249 * @opcode: opcode to check for
251 * During TMF a task has to be checked if it's affected.
252 * All unrelated I/O can be passed through, but I/O to the
253 * affected LUN should be restricted.
254 * If 'fast_abort' is set we won't be sending any I/O to the
256 * Otherwise the target is waiting for all TTTs to be completed,
257 * so we have to send all outstanding Data-Out PDUs to the target.
259 static int iscsi_check_tmf_restrictions(struct iscsi_task
*task
, int opcode
)
261 struct iscsi_conn
*conn
= task
->conn
;
262 struct iscsi_tm
*tmf
= &conn
->tmhdr
;
263 unsigned int hdr_lun
;
265 if (conn
->tmf_state
== TMF_INITIAL
)
268 if ((tmf
->opcode
& ISCSI_OPCODE_MASK
) != ISCSI_OP_SCSI_TMFUNC
)
271 switch (ISCSI_TM_FUNC_VALUE(tmf
)) {
272 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
274 * Allow PDUs for unrelated LUNs
276 hdr_lun
= scsilun_to_int(&tmf
->lun
);
277 if (hdr_lun
!= task
->sc
->device
->lun
)
280 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
282 * Fail all SCSI cmd PDUs
284 if (opcode
!= ISCSI_OP_SCSI_DATA_OUT
) {
285 iscsi_conn_printk(KERN_INFO
, conn
,
286 "task [op %x/%x itt "
289 task
->hdr
->opcode
, opcode
,
290 task
->itt
, task
->hdr_itt
);
294 * And also all data-out PDUs in response to R2T
295 * if fast_abort is set.
297 if (conn
->session
->fast_abort
) {
298 iscsi_conn_printk(KERN_INFO
, conn
,
299 "task [op %x/%x itt "
300 "0x%x/0x%x] fast abort.\n",
301 task
->hdr
->opcode
, opcode
,
302 task
->itt
, task
->hdr_itt
);
306 case ISCSI_TM_FUNC_ABORT_TASK
:
308 * the caller has already checked if the task
309 * they want to abort was in the pending queue so if
310 * we are here the cmd pdu has gone out already, and
311 * we will only hit this for data-outs
313 if (opcode
== ISCSI_OP_SCSI_DATA_OUT
&&
314 task
->hdr_itt
== tmf
->rtt
) {
315 ISCSI_DBG_SESSION(conn
->session
,
316 "Preventing task %x/%x from sending "
317 "data-out due to abort task in "
318 "progress\n", task
->itt
,
329 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
332 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
333 * fields like dlength or final based on how much data it sends
335 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task
*task
)
337 struct iscsi_conn
*conn
= task
->conn
;
338 struct iscsi_session
*session
= conn
->session
;
339 struct scsi_cmnd
*sc
= task
->sc
;
340 struct iscsi_scsi_req
*hdr
;
341 unsigned hdrlength
, cmd_len
;
345 rc
= iscsi_check_tmf_restrictions(task
, ISCSI_OP_SCSI_CMD
);
349 if (conn
->session
->tt
->alloc_pdu
) {
350 rc
= conn
->session
->tt
->alloc_pdu(task
, ISCSI_OP_SCSI_CMD
);
354 hdr
= (struct iscsi_scsi_req
*)task
->hdr
;
356 memset(hdr
, 0, sizeof(*hdr
));
358 if (session
->tt
->parse_pdu_itt
)
359 hdr
->itt
= task
->hdr_itt
= itt
;
361 hdr
->itt
= task
->hdr_itt
= build_itt(task
->itt
,
362 task
->conn
->session
->age
);
364 rc
= iscsi_add_hdr(task
, sizeof(*hdr
));
367 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
368 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
369 int_to_scsilun(sc
->device
->lun
, &hdr
->lun
);
370 task
->lun
= hdr
->lun
;
371 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
372 cmd_len
= sc
->cmd_len
;
373 if (cmd_len
< ISCSI_CDB_SIZE
)
374 memset(&hdr
->cdb
[cmd_len
], 0, ISCSI_CDB_SIZE
- cmd_len
);
375 else if (cmd_len
> ISCSI_CDB_SIZE
) {
376 rc
= iscsi_prep_ecdb_ahs(task
);
379 cmd_len
= ISCSI_CDB_SIZE
;
381 memcpy(hdr
->cdb
, sc
->cmnd
, cmd_len
);
384 if (scsi_bidi_cmnd(sc
)) {
385 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
386 rc
= iscsi_prep_bidi_ahs(task
);
390 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
391 unsigned out_len
= scsi_out(sc
)->length
;
392 struct iscsi_r2t_info
*r2t
= &task
->unsol_r2t
;
394 hdr
->data_length
= cpu_to_be32(out_len
);
395 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
399 * imm_count bytes to be sent right after
402 * unsol_count bytes(as Data-Out) to be sent
403 * without R2T ack right after
406 * r2t data_length bytes to be sent via R2T ack's
408 * pad_count bytes to be sent as zero-padding
410 memset(r2t
, 0, sizeof(*r2t
));
412 if (session
->imm_data_en
) {
413 if (out_len
>= session
->first_burst
)
414 task
->imm_count
= min(session
->first_burst
,
415 conn
->max_xmit_dlength
);
417 task
->imm_count
= min(out_len
,
418 conn
->max_xmit_dlength
);
419 hton24(hdr
->dlength
, task
->imm_count
);
421 zero_data(hdr
->dlength
);
423 if (!session
->initial_r2t_en
) {
424 r2t
->data_length
= min(session
->first_burst
, out_len
) -
426 r2t
->data_offset
= task
->imm_count
;
427 r2t
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
428 r2t
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
431 if (!task
->unsol_r2t
.data_length
)
432 /* No unsolicit Data-Out's */
433 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
435 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
436 zero_data(hdr
->dlength
);
437 hdr
->data_length
= cpu_to_be32(scsi_in(sc
)->length
);
439 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
440 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
443 /* calculate size of additional header segments (AHSs) */
444 hdrlength
= task
->hdr_len
- sizeof(*hdr
);
446 WARN_ON(hdrlength
& (ISCSI_PAD_LEN
-1));
447 hdrlength
/= ISCSI_PAD_LEN
;
449 WARN_ON(hdrlength
>= 256);
450 hdr
->hlength
= hdrlength
& 0xFF;
451 hdr
->cmdsn
= task
->cmdsn
= cpu_to_be32(session
->cmdsn
);
453 if (session
->tt
->init_task
&& session
->tt
->init_task(task
))
456 task
->state
= ISCSI_TASK_RUNNING
;
459 conn
->scsicmd_pdus_cnt
++;
460 ISCSI_DBG_SESSION(session
, "iscsi prep [%s cid %d sc %p cdb 0x%x "
461 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
462 scsi_bidi_cmnd(sc
) ? "bidirectional" :
463 sc
->sc_data_direction
== DMA_TO_DEVICE
?
464 "write" : "read", conn
->id
, sc
, sc
->cmnd
[0],
465 task
->itt
, scsi_bufflen(sc
),
466 scsi_bidi_cmnd(sc
) ? scsi_in(sc
)->length
: 0,
468 session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
473 * iscsi_free_task - free a task
474 * @task: iscsi cmd task
476 * Must be called with session back_lock.
477 * This function returns the scsi command to scsi-ml or cleans
478 * up mgmt tasks then returns the task to the pool.
480 static void iscsi_free_task(struct iscsi_task
*task
)
482 struct iscsi_conn
*conn
= task
->conn
;
483 struct iscsi_session
*session
= conn
->session
;
484 struct scsi_cmnd
*sc
= task
->sc
;
485 int oldstate
= task
->state
;
487 ISCSI_DBG_SESSION(session
, "freeing task itt 0x%x state %d sc %p\n",
488 task
->itt
, task
->state
, task
->sc
);
490 session
->tt
->cleanup_task(task
);
491 task
->state
= ISCSI_TASK_FREE
;
494 * login task is preallocated so do not free
496 if (conn
->login_task
== task
)
499 kfifo_in(&session
->cmdpool
.queue
, (void*)&task
, sizeof(void*));
502 /* SCSI eh reuses commands to verify us */
505 * queue command may call this to free the task, so
506 * it will decide how to return sc to scsi-ml.
508 if (oldstate
!= ISCSI_TASK_REQUEUE_SCSIQ
)
513 void __iscsi_get_task(struct iscsi_task
*task
)
515 atomic_inc(&task
->refcount
);
517 EXPORT_SYMBOL_GPL(__iscsi_get_task
);
519 void __iscsi_put_task(struct iscsi_task
*task
)
521 if (atomic_dec_and_test(&task
->refcount
))
522 iscsi_free_task(task
);
524 EXPORT_SYMBOL_GPL(__iscsi_put_task
);
526 void iscsi_put_task(struct iscsi_task
*task
)
528 struct iscsi_session
*session
= task
->conn
->session
;
530 /* regular RX path uses back_lock */
531 spin_lock_bh(&session
->back_lock
);
532 __iscsi_put_task(task
);
533 spin_unlock_bh(&session
->back_lock
);
535 EXPORT_SYMBOL_GPL(iscsi_put_task
);
538 * iscsi_complete_task - finish a task
539 * @task: iscsi cmd task
540 * @state: state to complete task with
542 * Must be called with session back_lock.
544 static void iscsi_complete_task(struct iscsi_task
*task
, int state
)
546 struct iscsi_conn
*conn
= task
->conn
;
548 ISCSI_DBG_SESSION(conn
->session
,
549 "complete task itt 0x%x state %d sc %p\n",
550 task
->itt
, task
->state
, task
->sc
);
551 if (task
->state
== ISCSI_TASK_COMPLETED
||
552 task
->state
== ISCSI_TASK_ABRT_TMF
||
553 task
->state
== ISCSI_TASK_ABRT_SESS_RECOV
||
554 task
->state
== ISCSI_TASK_REQUEUE_SCSIQ
)
556 WARN_ON_ONCE(task
->state
== ISCSI_TASK_FREE
);
559 if (!list_empty(&task
->running
))
560 list_del_init(&task
->running
);
562 if (conn
->task
== task
)
565 if (conn
->ping_task
== task
)
566 conn
->ping_task
= NULL
;
568 /* release get from queueing */
569 __iscsi_put_task(task
);
573 * iscsi_complete_scsi_task - finish scsi task normally
574 * @task: iscsi task for scsi cmd
575 * @exp_cmdsn: expected cmd sn in cpu format
576 * @max_cmdsn: max cmd sn in cpu format
578 * This is used when drivers do not need or cannot perform
579 * lower level pdu processing.
581 * Called with session back_lock
583 void iscsi_complete_scsi_task(struct iscsi_task
*task
,
584 uint32_t exp_cmdsn
, uint32_t max_cmdsn
)
586 struct iscsi_conn
*conn
= task
->conn
;
588 ISCSI_DBG_SESSION(conn
->session
, "[itt 0x%x]\n", task
->itt
);
590 conn
->last_recv
= jiffies
;
591 __iscsi_update_cmdsn(conn
->session
, exp_cmdsn
, max_cmdsn
);
592 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
594 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task
);
598 * session back_lock must be held and if not called for a task that is
599 * still pending or from the xmit thread, then xmit thread must
602 static void fail_scsi_task(struct iscsi_task
*task
, int err
)
604 struct iscsi_conn
*conn
= task
->conn
;
605 struct scsi_cmnd
*sc
;
609 * if a command completes and we get a successful tmf response
610 * we will hit this because the scsi eh abort code does not take
617 if (task
->state
== ISCSI_TASK_PENDING
) {
619 * cmd never made it to the xmit thread, so we should not count
620 * the cmd in the sequencing
622 conn
->session
->queued_cmdsn
--;
623 /* it was never sent so just complete like normal */
624 state
= ISCSI_TASK_COMPLETED
;
625 } else if (err
== DID_TRANSPORT_DISRUPTED
)
626 state
= ISCSI_TASK_ABRT_SESS_RECOV
;
628 state
= ISCSI_TASK_ABRT_TMF
;
630 sc
->result
= err
<< 16;
631 if (!scsi_bidi_cmnd(sc
))
632 scsi_set_resid(sc
, scsi_bufflen(sc
));
634 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
635 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
638 /* regular RX path uses back_lock */
639 spin_lock_bh(&conn
->session
->back_lock
);
640 iscsi_complete_task(task
, state
);
641 spin_unlock_bh(&conn
->session
->back_lock
);
644 static int iscsi_prep_mgmt_task(struct iscsi_conn
*conn
,
645 struct iscsi_task
*task
)
647 struct iscsi_session
*session
= conn
->session
;
648 struct iscsi_hdr
*hdr
= task
->hdr
;
649 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
650 uint8_t opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
;
652 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
655 if (opcode
!= ISCSI_OP_LOGIN
&& opcode
!= ISCSI_OP_TEXT
)
656 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
658 * pre-format CmdSN for outgoing PDU.
660 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
661 if (hdr
->itt
!= RESERVED_ITT
) {
663 * TODO: We always use immediate for normal session pdus.
664 * If we start to send tmfs or nops as non-immediate then
665 * we should start checking the cmdsn numbers for mgmt tasks.
667 * During discovery sessions iscsid sends TEXT as non immediate,
668 * but we always only send one PDU at a time.
670 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
671 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
672 session
->queued_cmdsn
++;
677 if (session
->tt
->init_task
&& session
->tt
->init_task(task
))
680 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
)
681 session
->state
= ISCSI_STATE_LOGGING_OUT
;
683 task
->state
= ISCSI_TASK_RUNNING
;
684 ISCSI_DBG_SESSION(session
, "mgmtpdu [op 0x%x hdr->itt 0x%x "
685 "datalen %d]\n", hdr
->opcode
& ISCSI_OPCODE_MASK
,
686 hdr
->itt
, task
->data_count
);
690 static struct iscsi_task
*
691 __iscsi_conn_send_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
692 char *data
, uint32_t data_size
)
694 struct iscsi_session
*session
= conn
->session
;
695 struct iscsi_host
*ihost
= shost_priv(session
->host
);
696 uint8_t opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
;
697 struct iscsi_task
*task
;
700 if (session
->state
== ISCSI_STATE_TERMINATE
)
703 if (opcode
== ISCSI_OP_LOGIN
|| opcode
== ISCSI_OP_TEXT
) {
705 * Login and Text are sent serially, in
706 * request-followed-by-response sequence.
707 * Same task can be used. Same ITT must be used.
708 * Note that login_task is preallocated at conn_create().
710 if (conn
->login_task
->state
!= ISCSI_TASK_FREE
) {
711 iscsi_conn_printk(KERN_ERR
, conn
, "Login/Text in "
712 "progress. Cannot start new task.\n");
716 task
= conn
->login_task
;
718 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
721 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
722 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
724 if (!kfifo_out(&session
->cmdpool
.queue
,
725 (void*)&task
, sizeof(void*)))
729 * released in complete pdu for task we expect a response for, and
730 * released by the lld when it has transmitted the task for
731 * pdus we do not expect a response for.
733 atomic_set(&task
->refcount
, 1);
736 INIT_LIST_HEAD(&task
->running
);
737 task
->state
= ISCSI_TASK_PENDING
;
740 memcpy(task
->data
, data
, data_size
);
741 task
->data_count
= data_size
;
743 task
->data_count
= 0;
745 if (conn
->session
->tt
->alloc_pdu
) {
746 if (conn
->session
->tt
->alloc_pdu(task
, hdr
->opcode
)) {
747 iscsi_conn_printk(KERN_ERR
, conn
, "Could not allocate "
748 "pdu for mgmt task.\n");
753 itt
= task
->hdr
->itt
;
754 task
->hdr_len
= sizeof(struct iscsi_hdr
);
755 memcpy(task
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
757 if (hdr
->itt
!= RESERVED_ITT
) {
758 if (session
->tt
->parse_pdu_itt
)
759 task
->hdr
->itt
= itt
;
761 task
->hdr
->itt
= build_itt(task
->itt
,
762 task
->conn
->session
->age
);
766 if (iscsi_prep_mgmt_task(conn
, task
))
769 if (session
->tt
->xmit_task(task
))
772 list_add_tail(&task
->running
, &conn
->mgmtqueue
);
773 iscsi_conn_queue_work(conn
);
779 /* regular RX path uses back_lock */
780 spin_lock_bh(&session
->back_lock
);
781 __iscsi_put_task(task
);
782 spin_unlock_bh(&session
->back_lock
);
786 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
787 char *data
, uint32_t data_size
)
789 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
790 struct iscsi_session
*session
= conn
->session
;
793 spin_lock_bh(&session
->frwd_lock
);
794 if (!__iscsi_conn_send_pdu(conn
, hdr
, data
, data_size
))
796 spin_unlock_bh(&session
->frwd_lock
);
799 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
802 * iscsi_cmd_rsp - SCSI Command Response processing
803 * @conn: iscsi connection
805 * @task: scsi command task
806 * @data: cmd data buffer
807 * @datalen: len of buffer
809 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
810 * then completes the command and task.
812 static void iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
813 struct iscsi_task
*task
, char *data
,
816 struct iscsi_scsi_rsp
*rhdr
= (struct iscsi_scsi_rsp
*)hdr
;
817 struct iscsi_session
*session
= conn
->session
;
818 struct scsi_cmnd
*sc
= task
->sc
;
820 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
821 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
823 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
825 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
826 sc
->result
= DID_ERROR
<< 16;
830 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
835 iscsi_conn_printk(KERN_ERR
, conn
,
836 "Got CHECK_CONDITION but invalid data "
837 "buffer size of %d\n", datalen
);
838 sc
->result
= DID_BAD_TARGET
<< 16;
842 senselen
= get_unaligned_be16(data
);
843 if (datalen
< senselen
)
844 goto invalid_datalen
;
846 memcpy(sc
->sense_buffer
, data
+ 2,
847 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
848 ISCSI_DBG_SESSION(session
, "copied %d bytes of sense\n",
849 min_t(uint16_t, senselen
,
850 SCSI_SENSE_BUFFERSIZE
));
853 if (rhdr
->flags
& (ISCSI_FLAG_CMD_BIDI_UNDERFLOW
|
854 ISCSI_FLAG_CMD_BIDI_OVERFLOW
)) {
855 int res_count
= be32_to_cpu(rhdr
->bi_residual_count
);
857 if (scsi_bidi_cmnd(sc
) && res_count
> 0 &&
858 (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_OVERFLOW
||
859 res_count
<= scsi_in(sc
)->length
))
860 scsi_in(sc
)->resid
= res_count
;
862 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
865 if (rhdr
->flags
& (ISCSI_FLAG_CMD_UNDERFLOW
|
866 ISCSI_FLAG_CMD_OVERFLOW
)) {
867 int res_count
= be32_to_cpu(rhdr
->residual_count
);
870 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
871 res_count
<= scsi_bufflen(sc
)))
872 /* write side for bidi or uni-io set_resid */
873 scsi_set_resid(sc
, res_count
);
875 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
878 ISCSI_DBG_SESSION(session
, "cmd rsp done [sc %p res %d itt 0x%x]\n",
879 sc
, sc
->result
, task
->itt
);
880 conn
->scsirsp_pdus_cnt
++;
881 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
885 * iscsi_data_in_rsp - SCSI Data-In Response processing
886 * @conn: iscsi connection
888 * @task: scsi command task
891 iscsi_data_in_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
892 struct iscsi_task
*task
)
894 struct iscsi_data_rsp
*rhdr
= (struct iscsi_data_rsp
*)hdr
;
895 struct scsi_cmnd
*sc
= task
->sc
;
897 if (!(rhdr
->flags
& ISCSI_FLAG_DATA_STATUS
))
900 iscsi_update_cmdsn(conn
->session
, (struct iscsi_nopin
*)hdr
);
901 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
902 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
903 if (rhdr
->flags
& (ISCSI_FLAG_DATA_UNDERFLOW
|
904 ISCSI_FLAG_DATA_OVERFLOW
)) {
905 int res_count
= be32_to_cpu(rhdr
->residual_count
);
908 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
909 res_count
<= scsi_in(sc
)->length
))
910 scsi_in(sc
)->resid
= res_count
;
912 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
915 ISCSI_DBG_SESSION(conn
->session
, "data in with status done "
916 "[sc %p res %d itt 0x%x]\n",
917 sc
, sc
->result
, task
->itt
);
918 conn
->scsirsp_pdus_cnt
++;
919 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
922 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
924 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
926 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
927 conn
->tmfrsp_pdus_cnt
++;
929 if (conn
->tmf_state
!= TMF_QUEUED
)
932 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
933 conn
->tmf_state
= TMF_SUCCESS
;
934 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
935 conn
->tmf_state
= TMF_NOT_FOUND
;
937 conn
->tmf_state
= TMF_FAILED
;
938 wake_up(&conn
->ehwait
);
941 static void iscsi_send_nopout(struct iscsi_conn
*conn
, struct iscsi_nopin
*rhdr
)
943 struct iscsi_nopout hdr
;
944 struct iscsi_task
*task
;
946 if (!rhdr
&& conn
->ping_task
)
949 memset(&hdr
, 0, sizeof(struct iscsi_nopout
));
950 hdr
.opcode
= ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
;
951 hdr
.flags
= ISCSI_FLAG_CMD_FINAL
;
956 hdr
.itt
= RESERVED_ITT
;
958 hdr
.ttt
= RESERVED_ITT
;
960 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)&hdr
, NULL
, 0);
962 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send nopout\n");
964 /* only track our nops */
965 conn
->ping_task
= task
;
966 conn
->last_ping
= jiffies
;
970 static int iscsi_nop_out_rsp(struct iscsi_task
*task
,
971 struct iscsi_nopin
*nop
, char *data
, int datalen
)
973 struct iscsi_conn
*conn
= task
->conn
;
976 if (conn
->ping_task
!= task
) {
978 * If this is not in response to one of our
979 * nops then it must be from userspace.
981 if (iscsi_recv_pdu(conn
->cls_conn
, (struct iscsi_hdr
*)nop
,
983 rc
= ISCSI_ERR_CONN_FAILED
;
985 mod_timer(&conn
->transport_timer
, jiffies
+ conn
->recv_timeout
);
986 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
990 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
991 char *data
, int datalen
)
993 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
994 struct iscsi_hdr rejected_pdu
;
997 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
999 if (ntoh24(reject
->dlength
) > datalen
||
1000 ntoh24(reject
->dlength
) < sizeof(struct iscsi_hdr
)) {
1001 iscsi_conn_printk(KERN_ERR
, conn
, "Cannot handle rejected "
1002 "pdu. Invalid data length (pdu dlength "
1003 "%u, datalen %d\n", ntoh24(reject
->dlength
),
1005 return ISCSI_ERR_PROTO
;
1007 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
1008 opcode
= rejected_pdu
.opcode
& ISCSI_OPCODE_MASK
;
1010 switch (reject
->reason
) {
1011 case ISCSI_REASON_DATA_DIGEST_ERROR
:
1012 iscsi_conn_printk(KERN_ERR
, conn
,
1013 "pdu (op 0x%x itt 0x%x) rejected "
1014 "due to DataDigest error.\n",
1015 opcode
, rejected_pdu
.itt
);
1017 case ISCSI_REASON_IMM_CMD_REJECT
:
1018 iscsi_conn_printk(KERN_ERR
, conn
,
1019 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1020 "immediate commands.\n",
1021 opcode
, rejected_pdu
.itt
);
1023 * We only send one TMF at a time so if the target could not
1024 * handle it, then it should get fixed (RFC mandates that
1025 * a target can handle one immediate TMF per conn).
1027 * For nops-outs, we could have sent more than one if
1028 * the target is sending us lots of nop-ins
1030 if (opcode
!= ISCSI_OP_NOOP_OUT
)
1033 if (rejected_pdu
.itt
== cpu_to_be32(ISCSI_RESERVED_TAG
)) {
1035 * nop-out in response to target's nop-out rejected.
1038 /* In RX path we are under back lock */
1039 spin_unlock(&conn
->session
->back_lock
);
1040 spin_lock(&conn
->session
->frwd_lock
);
1041 iscsi_send_nopout(conn
,
1042 (struct iscsi_nopin
*)&rejected_pdu
);
1043 spin_unlock(&conn
->session
->frwd_lock
);
1044 spin_lock(&conn
->session
->back_lock
);
1046 struct iscsi_task
*task
;
1048 * Our nop as ping got dropped. We know the target
1049 * and transport are ok so just clean up
1051 task
= iscsi_itt_to_task(conn
, rejected_pdu
.itt
);
1053 iscsi_conn_printk(KERN_ERR
, conn
,
1054 "Invalid pdu reject. Could "
1055 "not lookup rejected task.\n");
1056 rc
= ISCSI_ERR_BAD_ITT
;
1058 rc
= iscsi_nop_out_rsp(task
,
1059 (struct iscsi_nopin
*)&rejected_pdu
,
1064 iscsi_conn_printk(KERN_ERR
, conn
,
1065 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1066 "code 0x%x\n", rejected_pdu
.opcode
,
1067 rejected_pdu
.itt
, reject
->reason
);
1074 * iscsi_itt_to_task - look up task by itt
1075 * @conn: iscsi connection
1078 * This should be used for mgmt tasks like login and nops, or if
1079 * the LDD's itt space does not include the session age.
1081 * The session back_lock must be held.
1083 struct iscsi_task
*iscsi_itt_to_task(struct iscsi_conn
*conn
, itt_t itt
)
1085 struct iscsi_session
*session
= conn
->session
;
1088 if (itt
== RESERVED_ITT
)
1091 if (session
->tt
->parse_pdu_itt
)
1092 session
->tt
->parse_pdu_itt(conn
, itt
, &i
, NULL
);
1095 if (i
>= session
->cmds_max
)
1098 return session
->cmds
[i
];
1100 EXPORT_SYMBOL_GPL(iscsi_itt_to_task
);
1103 * __iscsi_complete_pdu - complete pdu
1105 * @hdr: iscsi header
1106 * @data: data buffer
1107 * @datalen: len of data buffer
1109 * Completes pdu processing by freeing any resources allocated at
1110 * queuecommand or send generic. session back_lock must be held and verify
1111 * itt must have been called.
1113 int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
1114 char *data
, int datalen
)
1116 struct iscsi_session
*session
= conn
->session
;
1117 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
1118 struct iscsi_task
*task
;
1121 conn
->last_recv
= jiffies
;
1122 rc
= iscsi_verify_itt(conn
, hdr
->itt
);
1126 if (hdr
->itt
!= RESERVED_ITT
)
1127 itt
= get_itt(hdr
->itt
);
1131 ISCSI_DBG_SESSION(session
, "[op 0x%x cid %d itt 0x%x len %d]\n",
1132 opcode
, conn
->id
, itt
, datalen
);
1135 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1138 case ISCSI_OP_NOOP_IN
:
1140 rc
= ISCSI_ERR_PROTO
;
1144 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
1147 /* In RX path we are under back lock */
1148 spin_unlock(&session
->back_lock
);
1149 spin_lock(&session
->frwd_lock
);
1150 iscsi_send_nopout(conn
, (struct iscsi_nopin
*)hdr
);
1151 spin_unlock(&session
->frwd_lock
);
1152 spin_lock(&session
->back_lock
);
1154 case ISCSI_OP_REJECT
:
1155 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
1157 case ISCSI_OP_ASYNC_EVENT
:
1158 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
1159 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
1160 rc
= ISCSI_ERR_CONN_FAILED
;
1163 rc
= ISCSI_ERR_BAD_OPCODE
;
1170 case ISCSI_OP_SCSI_CMD_RSP
:
1171 case ISCSI_OP_SCSI_DATA_IN
:
1172 task
= iscsi_itt_to_ctask(conn
, hdr
->itt
);
1174 return ISCSI_ERR_BAD_ITT
;
1175 task
->last_xfer
= jiffies
;
1179 * LLD handles R2Ts if they need to.
1182 case ISCSI_OP_LOGOUT_RSP
:
1183 case ISCSI_OP_LOGIN_RSP
:
1184 case ISCSI_OP_TEXT_RSP
:
1185 case ISCSI_OP_SCSI_TMFUNC_RSP
:
1186 case ISCSI_OP_NOOP_IN
:
1187 task
= iscsi_itt_to_task(conn
, hdr
->itt
);
1189 return ISCSI_ERR_BAD_ITT
;
1192 return ISCSI_ERR_BAD_OPCODE
;
1196 case ISCSI_OP_SCSI_CMD_RSP
:
1197 iscsi_scsi_cmd_rsp(conn
, hdr
, task
, data
, datalen
);
1199 case ISCSI_OP_SCSI_DATA_IN
:
1200 iscsi_data_in_rsp(conn
, hdr
, task
);
1202 case ISCSI_OP_LOGOUT_RSP
:
1203 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1205 rc
= ISCSI_ERR_PROTO
;
1208 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
1210 case ISCSI_OP_LOGIN_RSP
:
1211 case ISCSI_OP_TEXT_RSP
:
1212 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1214 * login related PDU's exp_statsn is handled in
1218 case ISCSI_OP_SCSI_TMFUNC_RSP
:
1219 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1221 rc
= ISCSI_ERR_PROTO
;
1225 iscsi_tmf_rsp(conn
, hdr
);
1226 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
1228 case ISCSI_OP_NOOP_IN
:
1229 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1230 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) || datalen
) {
1231 rc
= ISCSI_ERR_PROTO
;
1234 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
1236 rc
= iscsi_nop_out_rsp(task
, (struct iscsi_nopin
*)hdr
,
1240 rc
= ISCSI_ERR_BAD_OPCODE
;
1247 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
1248 rc
= ISCSI_ERR_CONN_FAILED
;
1249 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
1252 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu
);
1254 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
1255 char *data
, int datalen
)
1259 spin_lock(&conn
->session
->back_lock
);
1260 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
1261 spin_unlock(&conn
->session
->back_lock
);
1264 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
1266 int iscsi_verify_itt(struct iscsi_conn
*conn
, itt_t itt
)
1268 struct iscsi_session
*session
= conn
->session
;
1271 if (itt
== RESERVED_ITT
)
1274 if (session
->tt
->parse_pdu_itt
)
1275 session
->tt
->parse_pdu_itt(conn
, itt
, &i
, &age
);
1278 age
= ((__force u32
)itt
>> ISCSI_AGE_SHIFT
) & ISCSI_AGE_MASK
;
1281 if (age
!= session
->age
) {
1282 iscsi_conn_printk(KERN_ERR
, conn
,
1283 "received itt %x expected session age (%x)\n",
1284 (__force u32
)itt
, session
->age
);
1285 return ISCSI_ERR_BAD_ITT
;
1288 if (i
>= session
->cmds_max
) {
1289 iscsi_conn_printk(KERN_ERR
, conn
,
1290 "received invalid itt index %u (max cmds "
1291 "%u.\n", i
, session
->cmds_max
);
1292 return ISCSI_ERR_BAD_ITT
;
1296 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
1299 * iscsi_itt_to_ctask - look up ctask by itt
1300 * @conn: iscsi connection
1303 * This should be used for cmd tasks.
1305 * The session back_lock must be held.
1307 struct iscsi_task
*iscsi_itt_to_ctask(struct iscsi_conn
*conn
, itt_t itt
)
1309 struct iscsi_task
*task
;
1311 if (iscsi_verify_itt(conn
, itt
))
1314 task
= iscsi_itt_to_task(conn
, itt
);
1315 if (!task
|| !task
->sc
)
1318 if (task
->sc
->SCp
.phase
!= conn
->session
->age
) {
1319 iscsi_session_printk(KERN_ERR
, conn
->session
,
1320 "task's session age %d, expected %d\n",
1321 task
->sc
->SCp
.phase
, conn
->session
->age
);
1327 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask
);
1329 void iscsi_session_failure(struct iscsi_session
*session
,
1332 struct iscsi_conn
*conn
;
1335 spin_lock_bh(&session
->frwd_lock
);
1336 conn
= session
->leadconn
;
1337 if (session
->state
== ISCSI_STATE_TERMINATE
|| !conn
) {
1338 spin_unlock_bh(&session
->frwd_lock
);
1342 dev
= get_device(&conn
->cls_conn
->dev
);
1343 spin_unlock_bh(&session
->frwd_lock
);
1347 * if the host is being removed bypass the connection
1348 * recovery initialization because we are going to kill
1351 if (err
== ISCSI_ERR_INVALID_HOST
)
1352 iscsi_conn_error_event(conn
->cls_conn
, err
);
1354 iscsi_conn_failure(conn
, err
);
1357 EXPORT_SYMBOL_GPL(iscsi_session_failure
);
1359 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
1361 struct iscsi_session
*session
= conn
->session
;
1363 spin_lock_bh(&session
->frwd_lock
);
1364 if (session
->state
== ISCSI_STATE_FAILED
) {
1365 spin_unlock_bh(&session
->frwd_lock
);
1369 if (conn
->stop_stage
== 0)
1370 session
->state
= ISCSI_STATE_FAILED
;
1371 spin_unlock_bh(&session
->frwd_lock
);
1373 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1374 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1375 iscsi_conn_error_event(conn
->cls_conn
, err
);
1377 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
1379 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn
*conn
)
1381 struct iscsi_session
*session
= conn
->session
;
1384 * Check for iSCSI window and take care of CmdSN wrap-around
1386 if (!iscsi_sna_lte(session
->queued_cmdsn
, session
->max_cmdsn
)) {
1387 ISCSI_DBG_SESSION(session
, "iSCSI CmdSN closed. ExpCmdSn "
1388 "%u MaxCmdSN %u CmdSN %u/%u\n",
1389 session
->exp_cmdsn
, session
->max_cmdsn
,
1390 session
->cmdsn
, session
->queued_cmdsn
);
1396 static int iscsi_xmit_task(struct iscsi_conn
*conn
)
1398 struct iscsi_task
*task
= conn
->task
;
1401 if (test_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
))
1404 __iscsi_get_task(task
);
1405 spin_unlock_bh(&conn
->session
->frwd_lock
);
1406 rc
= conn
->session
->tt
->xmit_task(task
);
1407 spin_lock_bh(&conn
->session
->frwd_lock
);
1409 /* done with this task */
1410 task
->last_xfer
= jiffies
;
1413 /* regular RX path uses back_lock */
1414 spin_lock_bh(&conn
->session
->back_lock
);
1415 __iscsi_put_task(task
);
1416 spin_unlock_bh(&conn
->session
->back_lock
);
1421 * iscsi_requeue_task - requeue task to run from session workqueue
1422 * @task: task to requeue
1424 * LLDs that need to run a task from the session workqueue should call
1425 * this. The session frwd_lock must be held. This should only be called
1426 * by software drivers.
1428 void iscsi_requeue_task(struct iscsi_task
*task
)
1430 struct iscsi_conn
*conn
= task
->conn
;
1433 * this may be on the requeue list already if the xmit_task callout
1434 * is handling the r2ts while we are adding new ones
1436 if (list_empty(&task
->running
))
1437 list_add_tail(&task
->running
, &conn
->requeue
);
1438 iscsi_conn_queue_work(conn
);
1440 EXPORT_SYMBOL_GPL(iscsi_requeue_task
);
1443 * iscsi_data_xmit - xmit any command into the scheduled connection
1444 * @conn: iscsi connection
1447 * The function can return -EAGAIN in which case the caller must
1448 * re-schedule it again later or recover. '0' return code means
1451 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
1453 struct iscsi_task
*task
;
1456 spin_lock_bh(&conn
->session
->frwd_lock
);
1457 if (test_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
)) {
1458 ISCSI_DBG_SESSION(conn
->session
, "Tx suspended!\n");
1459 spin_unlock_bh(&conn
->session
->frwd_lock
);
1464 rc
= iscsi_xmit_task(conn
);
1470 * process mgmt pdus like nops before commands since we should
1471 * only have one nop-out as a ping from us and targets should not
1472 * overflow us with nop-ins
1475 while (!list_empty(&conn
->mgmtqueue
)) {
1476 conn
->task
= list_entry(conn
->mgmtqueue
.next
,
1477 struct iscsi_task
, running
);
1478 list_del_init(&conn
->task
->running
);
1479 if (iscsi_prep_mgmt_task(conn
, conn
->task
)) {
1480 /* regular RX path uses back_lock */
1481 spin_lock_bh(&conn
->session
->back_lock
);
1482 __iscsi_put_task(conn
->task
);
1483 spin_unlock_bh(&conn
->session
->back_lock
);
1487 rc
= iscsi_xmit_task(conn
);
1492 /* process pending command queue */
1493 while (!list_empty(&conn
->cmdqueue
)) {
1494 conn
->task
= list_entry(conn
->cmdqueue
.next
, struct iscsi_task
,
1496 list_del_init(&conn
->task
->running
);
1497 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
1498 fail_scsi_task(conn
->task
, DID_IMM_RETRY
);
1501 rc
= iscsi_prep_scsi_cmd_pdu(conn
->task
);
1503 if (rc
== -ENOMEM
|| rc
== -EACCES
) {
1504 list_add_tail(&conn
->task
->running
,
1509 fail_scsi_task(conn
->task
, DID_ABORT
);
1512 rc
= iscsi_xmit_task(conn
);
1516 * we could continuously get new task requests so
1517 * we need to check the mgmt queue for nops that need to
1518 * be sent to aviod starvation
1520 if (!list_empty(&conn
->mgmtqueue
))
1524 while (!list_empty(&conn
->requeue
)) {
1526 * we always do fastlogout - conn stop code will clean up.
1528 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
1531 task
= list_entry(conn
->requeue
.next
, struct iscsi_task
,
1533 if (iscsi_check_tmf_restrictions(task
, ISCSI_OP_SCSI_DATA_OUT
))
1537 list_del_init(&conn
->task
->running
);
1538 conn
->task
->state
= ISCSI_TASK_RUNNING
;
1539 rc
= iscsi_xmit_task(conn
);
1542 if (!list_empty(&conn
->mgmtqueue
))
1545 spin_unlock_bh(&conn
->session
->frwd_lock
);
1549 spin_unlock_bh(&conn
->session
->frwd_lock
);
1553 static void iscsi_xmitworker(struct work_struct
*work
)
1555 struct iscsi_conn
*conn
=
1556 container_of(work
, struct iscsi_conn
, xmitwork
);
1559 * serialize Xmit worker on a per-connection basis.
1562 rc
= iscsi_data_xmit(conn
);
1563 } while (rc
>= 0 || rc
== -EAGAIN
);
1566 static inline struct iscsi_task
*iscsi_alloc_task(struct iscsi_conn
*conn
,
1567 struct scsi_cmnd
*sc
)
1569 struct iscsi_task
*task
;
1571 if (!kfifo_out(&conn
->session
->cmdpool
.queue
,
1572 (void *) &task
, sizeof(void *)))
1575 sc
->SCp
.phase
= conn
->session
->age
;
1576 sc
->SCp
.ptr
= (char *) task
;
1578 atomic_set(&task
->refcount
, 1);
1579 task
->state
= ISCSI_TASK_PENDING
;
1582 task
->have_checked_conn
= false;
1583 task
->last_timeout
= jiffies
;
1584 task
->last_xfer
= jiffies
;
1585 INIT_LIST_HEAD(&task
->running
);
1590 FAILURE_BAD_HOST
= 1,
1591 FAILURE_SESSION_FAILED
,
1592 FAILURE_SESSION_FREED
,
1593 FAILURE_WINDOW_CLOSED
,
1595 FAILURE_SESSION_TERMINATE
,
1596 FAILURE_SESSION_IN_RECOVERY
,
1597 FAILURE_SESSION_RECOVERY_TIMEOUT
,
1598 FAILURE_SESSION_LOGGING_OUT
,
1599 FAILURE_SESSION_NOT_READY
,
1602 int iscsi_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*sc
)
1604 struct iscsi_cls_session
*cls_session
;
1605 struct iscsi_host
*ihost
;
1607 struct iscsi_session
*session
;
1608 struct iscsi_conn
*conn
;
1609 struct iscsi_task
*task
= NULL
;
1614 ihost
= shost_priv(host
);
1616 cls_session
= starget_to_session(scsi_target(sc
->device
));
1617 session
= cls_session
->dd_data
;
1618 spin_lock_bh(&session
->frwd_lock
);
1620 reason
= iscsi_session_chkready(cls_session
);
1622 sc
->result
= reason
;
1626 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1628 * to handle the race between when we set the recovery state
1629 * and block the session we requeue here (commands could
1630 * be entering our queuecommand while a block is starting
1631 * up because the block code is not locked)
1633 switch (session
->state
) {
1634 case ISCSI_STATE_FAILED
:
1635 case ISCSI_STATE_IN_RECOVERY
:
1636 reason
= FAILURE_SESSION_IN_RECOVERY
;
1637 sc
->result
= DID_IMM_RETRY
<< 16;
1639 case ISCSI_STATE_LOGGING_OUT
:
1640 reason
= FAILURE_SESSION_LOGGING_OUT
;
1641 sc
->result
= DID_IMM_RETRY
<< 16;
1643 case ISCSI_STATE_RECOVERY_FAILED
:
1644 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
1645 sc
->result
= DID_TRANSPORT_FAILFAST
<< 16;
1647 case ISCSI_STATE_TERMINATE
:
1648 reason
= FAILURE_SESSION_TERMINATE
;
1649 sc
->result
= DID_NO_CONNECT
<< 16;
1652 reason
= FAILURE_SESSION_FREED
;
1653 sc
->result
= DID_NO_CONNECT
<< 16;
1658 conn
= session
->leadconn
;
1660 reason
= FAILURE_SESSION_FREED
;
1661 sc
->result
= DID_NO_CONNECT
<< 16;
1665 if (test_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
)) {
1666 reason
= FAILURE_SESSION_IN_RECOVERY
;
1667 sc
->result
= DID_REQUEUE
;
1671 if (iscsi_check_cmdsn_window_closed(conn
)) {
1672 reason
= FAILURE_WINDOW_CLOSED
;
1676 task
= iscsi_alloc_task(conn
, sc
);
1678 reason
= FAILURE_OOM
;
1682 if (!ihost
->workq
) {
1683 reason
= iscsi_prep_scsi_cmd_pdu(task
);
1685 if (reason
== -ENOMEM
|| reason
== -EACCES
) {
1686 reason
= FAILURE_OOM
;
1689 sc
->result
= DID_ABORT
<< 16;
1693 if (session
->tt
->xmit_task(task
)) {
1695 reason
= FAILURE_SESSION_NOT_READY
;
1699 list_add_tail(&task
->running
, &conn
->cmdqueue
);
1700 iscsi_conn_queue_work(conn
);
1703 session
->queued_cmdsn
++;
1704 spin_unlock_bh(&session
->frwd_lock
);
1708 iscsi_complete_task(task
, ISCSI_TASK_REQUEUE_SCSIQ
);
1710 spin_unlock_bh(&session
->frwd_lock
);
1711 ISCSI_DBG_SESSION(session
, "cmd 0x%x rejected (%d)\n",
1712 sc
->cmnd
[0], reason
);
1713 return SCSI_MLQUEUE_TARGET_BUSY
;
1716 iscsi_complete_task(task
, ISCSI_TASK_REQUEUE_SCSIQ
);
1718 spin_unlock_bh(&session
->frwd_lock
);
1719 ISCSI_DBG_SESSION(session
, "iscsi: cmd 0x%x is not queued (%d)\n",
1720 sc
->cmnd
[0], reason
);
1721 if (!scsi_bidi_cmnd(sc
))
1722 scsi_set_resid(sc
, scsi_bufflen(sc
));
1724 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
1725 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
1730 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
1732 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
, int reason
)
1735 case SCSI_QDEPTH_DEFAULT
:
1736 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
1738 case SCSI_QDEPTH_QFULL
:
1739 scsi_track_queue_full(sdev
, depth
);
1741 case SCSI_QDEPTH_RAMP_UP
:
1742 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
1747 return sdev
->queue_depth
;
1749 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
1751 int iscsi_target_alloc(struct scsi_target
*starget
)
1753 struct iscsi_cls_session
*cls_session
= starget_to_session(starget
);
1754 struct iscsi_session
*session
= cls_session
->dd_data
;
1756 starget
->can_queue
= session
->scsi_cmds_max
;
1759 EXPORT_SYMBOL_GPL(iscsi_target_alloc
);
1761 static void iscsi_tmf_timedout(unsigned long data
)
1763 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1764 struct iscsi_session
*session
= conn
->session
;
1766 spin_lock(&session
->frwd_lock
);
1767 if (conn
->tmf_state
== TMF_QUEUED
) {
1768 conn
->tmf_state
= TMF_TIMEDOUT
;
1769 ISCSI_DBG_EH(session
, "tmf timedout\n");
1770 /* unblock eh_abort() */
1771 wake_up(&conn
->ehwait
);
1773 spin_unlock(&session
->frwd_lock
);
1776 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn
*conn
,
1777 struct iscsi_tm
*hdr
, int age
,
1780 struct iscsi_session
*session
= conn
->session
;
1781 struct iscsi_task
*task
;
1783 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)hdr
,
1786 spin_unlock_bh(&session
->frwd_lock
);
1787 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send TMF.\n");
1788 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1789 spin_lock_bh(&session
->frwd_lock
);
1792 conn
->tmfcmd_pdus_cnt
++;
1793 conn
->tmf_timer
.expires
= timeout
* HZ
+ jiffies
;
1794 conn
->tmf_timer
.function
= iscsi_tmf_timedout
;
1795 conn
->tmf_timer
.data
= (unsigned long)conn
;
1796 add_timer(&conn
->tmf_timer
);
1797 ISCSI_DBG_EH(session
, "tmf set timeout\n");
1799 spin_unlock_bh(&session
->frwd_lock
);
1800 mutex_unlock(&session
->eh_mutex
);
1803 * block eh thread until:
1807 * 3) session is terminated or restarted or userspace has
1808 * given up on recovery
1810 wait_event_interruptible(conn
->ehwait
, age
!= session
->age
||
1811 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1812 conn
->tmf_state
!= TMF_QUEUED
);
1813 if (signal_pending(current
))
1814 flush_signals(current
);
1815 del_timer_sync(&conn
->tmf_timer
);
1817 mutex_lock(&session
->eh_mutex
);
1818 spin_lock_bh(&session
->frwd_lock
);
1819 /* if the session drops it will clean up the task */
1820 if (age
!= session
->age
||
1821 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1827 * Fail commands. session lock held and recv side suspended and xmit
1830 static void fail_scsi_tasks(struct iscsi_conn
*conn
, unsigned lun
,
1833 struct iscsi_task
*task
;
1836 for (i
= 0; i
< conn
->session
->cmds_max
; i
++) {
1837 task
= conn
->session
->cmds
[i
];
1838 if (!task
->sc
|| task
->state
== ISCSI_TASK_FREE
)
1841 if (lun
!= -1 && lun
!= task
->sc
->device
->lun
)
1844 ISCSI_DBG_SESSION(conn
->session
,
1845 "failing sc %p itt 0x%x state %d\n",
1846 task
->sc
, task
->itt
, task
->state
);
1847 fail_scsi_task(task
, error
);
1852 * iscsi_suspend_queue - suspend iscsi_queuecommand
1853 * @conn: iscsi conn to stop queueing IO on
1855 * This grabs the session frwd_lock to make sure no one is in
1856 * xmit_task/queuecommand, and then sets suspend to prevent
1857 * new commands from being queued. This only needs to be called
1858 * by offload drivers that need to sync a path like ep disconnect
1859 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1860 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1862 void iscsi_suspend_queue(struct iscsi_conn
*conn
)
1864 spin_lock_bh(&conn
->session
->frwd_lock
);
1865 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1866 spin_unlock_bh(&conn
->session
->frwd_lock
);
1868 EXPORT_SYMBOL_GPL(iscsi_suspend_queue
);
1871 * iscsi_suspend_tx - suspend iscsi_data_xmit
1872 * @conn: iscsi conn tp stop processing IO on.
1874 * This function sets the suspend bit to prevent iscsi_data_xmit
1875 * from sending new IO, and if work is queued on the xmit thread
1876 * it will wait for it to be completed.
1878 void iscsi_suspend_tx(struct iscsi_conn
*conn
)
1880 struct Scsi_Host
*shost
= conn
->session
->host
;
1881 struct iscsi_host
*ihost
= shost_priv(shost
);
1883 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1885 flush_workqueue(ihost
->workq
);
1887 EXPORT_SYMBOL_GPL(iscsi_suspend_tx
);
1889 static void iscsi_start_tx(struct iscsi_conn
*conn
)
1891 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1892 iscsi_conn_queue_work(conn
);
1896 * We want to make sure a ping is in flight. It has timed out.
1897 * And we are not busy processing a pdu that is making
1898 * progress but got started before the ping and is taking a while
1899 * to complete so the ping is just stuck behind it in a queue.
1901 static int iscsi_has_ping_timed_out(struct iscsi_conn
*conn
)
1903 if (conn
->ping_task
&&
1904 time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
) +
1905 (conn
->ping_timeout
* HZ
), jiffies
))
1911 static enum blk_eh_timer_return
iscsi_eh_cmd_timed_out(struct scsi_cmnd
*sc
)
1913 enum blk_eh_timer_return rc
= BLK_EH_NOT_HANDLED
;
1914 struct iscsi_task
*task
= NULL
, *running_task
;
1915 struct iscsi_cls_session
*cls_session
;
1916 struct iscsi_session
*session
;
1917 struct iscsi_conn
*conn
;
1920 cls_session
= starget_to_session(scsi_target(sc
->device
));
1921 session
= cls_session
->dd_data
;
1923 ISCSI_DBG_EH(session
, "scsi cmd %p timedout\n", sc
);
1925 spin_lock(&session
->frwd_lock
);
1926 task
= (struct iscsi_task
*)sc
->SCp
.ptr
;
1929 * Raced with completion. Blk layer has taken ownership
1930 * so let timeout code complete it now.
1932 rc
= BLK_EH_HANDLED
;
1936 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1938 * We are probably in the middle of iscsi recovery so let
1939 * that complete and handle the error.
1941 rc
= BLK_EH_RESET_TIMER
;
1945 conn
= session
->leadconn
;
1947 /* In the middle of shuting down */
1948 rc
= BLK_EH_RESET_TIMER
;
1953 * If we have sent (at least queued to the network layer) a pdu or
1954 * recvd one for the task since the last timeout ask for
1955 * more time. If on the next timeout we have not made progress
1956 * we can check if it is the task or connection when we send the
1959 if (time_after(task
->last_xfer
, task
->last_timeout
)) {
1960 ISCSI_DBG_EH(session
, "Command making progress. Asking "
1961 "scsi-ml for more time to complete. "
1962 "Last data xfer at %lu. Last timeout was at "
1963 "%lu\n.", task
->last_xfer
, task
->last_timeout
);
1964 task
->have_checked_conn
= false;
1965 rc
= BLK_EH_RESET_TIMER
;
1969 if (!conn
->recv_timeout
&& !conn
->ping_timeout
)
1972 * if the ping timedout then we are in the middle of cleaning up
1973 * and can let the iscsi eh handle it
1975 if (iscsi_has_ping_timed_out(conn
)) {
1976 rc
= BLK_EH_RESET_TIMER
;
1980 for (i
= 0; i
< conn
->session
->cmds_max
; i
++) {
1981 running_task
= conn
->session
->cmds
[i
];
1982 if (!running_task
->sc
|| running_task
== task
||
1983 running_task
->state
!= ISCSI_TASK_RUNNING
)
1987 * Only check if cmds started before this one have made
1988 * progress, or this could never fail
1990 if (time_after(running_task
->sc
->jiffies_at_alloc
,
1991 task
->sc
->jiffies_at_alloc
))
1994 if (time_after(running_task
->last_xfer
, task
->last_timeout
)) {
1996 * This task has not made progress, but a task
1997 * started before us has transferred data since
1998 * we started/last-checked. We could be queueing
1999 * too many tasks or the LU is bad.
2001 * If the device is bad the cmds ahead of us on
2002 * other devs will complete, and this loop will
2003 * eventually fail starting the scsi eh.
2005 ISCSI_DBG_EH(session
, "Command has not made progress "
2006 "but commands ahead of it have. "
2007 "Asking scsi-ml for more time to "
2008 "complete. Our last xfer vs running task "
2009 "last xfer %lu/%lu. Last check %lu.\n",
2010 task
->last_xfer
, running_task
->last_xfer
,
2011 task
->last_timeout
);
2012 rc
= BLK_EH_RESET_TIMER
;
2017 /* Assumes nop timeout is shorter than scsi cmd timeout */
2018 if (task
->have_checked_conn
)
2022 * Checking the transport already or nop from a cmd timeout still
2025 if (conn
->ping_task
) {
2026 task
->have_checked_conn
= true;
2027 rc
= BLK_EH_RESET_TIMER
;
2031 /* Make sure there is a transport check done */
2032 iscsi_send_nopout(conn
, NULL
);
2033 task
->have_checked_conn
= true;
2034 rc
= BLK_EH_RESET_TIMER
;
2038 task
->last_timeout
= jiffies
;
2039 spin_unlock(&session
->frwd_lock
);
2040 ISCSI_DBG_EH(session
, "return %s\n", rc
== BLK_EH_RESET_TIMER
?
2041 "timer reset" : "nh");
2045 static void iscsi_check_transport_timeouts(unsigned long data
)
2047 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
2048 struct iscsi_session
*session
= conn
->session
;
2049 unsigned long recv_timeout
, next_timeout
= 0, last_recv
;
2051 spin_lock(&session
->frwd_lock
);
2052 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
2055 recv_timeout
= conn
->recv_timeout
;
2060 last_recv
= conn
->last_recv
;
2062 if (iscsi_has_ping_timed_out(conn
)) {
2063 iscsi_conn_printk(KERN_ERR
, conn
, "ping timeout of %d secs "
2064 "expired, recv timeout %d, last rx %lu, "
2065 "last ping %lu, now %lu\n",
2066 conn
->ping_timeout
, conn
->recv_timeout
,
2067 last_recv
, conn
->last_ping
, jiffies
);
2068 spin_unlock(&session
->frwd_lock
);
2069 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
2073 if (time_before_eq(last_recv
+ recv_timeout
, jiffies
)) {
2074 /* send a ping to try to provoke some traffic */
2075 ISCSI_DBG_CONN(conn
, "Sending nopout as ping\n");
2076 iscsi_send_nopout(conn
, NULL
);
2077 next_timeout
= conn
->last_ping
+ (conn
->ping_timeout
* HZ
);
2079 next_timeout
= last_recv
+ recv_timeout
;
2081 ISCSI_DBG_CONN(conn
, "Setting next tmo %lu\n", next_timeout
);
2082 mod_timer(&conn
->transport_timer
, next_timeout
);
2084 spin_unlock(&session
->frwd_lock
);
2087 static void iscsi_prep_abort_task_pdu(struct iscsi_task
*task
,
2088 struct iscsi_tm
*hdr
)
2090 memset(hdr
, 0, sizeof(*hdr
));
2091 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
2092 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
& ISCSI_FLAG_TM_FUNC_MASK
;
2093 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2094 hdr
->lun
= task
->lun
;
2095 hdr
->rtt
= task
->hdr_itt
;
2096 hdr
->refcmdsn
= task
->cmdsn
;
2099 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
2101 struct iscsi_cls_session
*cls_session
;
2102 struct iscsi_session
*session
;
2103 struct iscsi_conn
*conn
;
2104 struct iscsi_task
*task
;
2105 struct iscsi_tm
*hdr
;
2108 cls_session
= starget_to_session(scsi_target(sc
->device
));
2109 session
= cls_session
->dd_data
;
2111 ISCSI_DBG_EH(session
, "aborting sc %p\n", sc
);
2113 mutex_lock(&session
->eh_mutex
);
2114 spin_lock_bh(&session
->frwd_lock
);
2116 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2120 ISCSI_DBG_EH(session
, "sc never reached iscsi layer or "
2122 spin_unlock_bh(&session
->frwd_lock
);
2123 mutex_unlock(&session
->eh_mutex
);
2128 * If we are not logged in or we have started a new session
2129 * then let the host reset code handle this
2131 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
||
2132 sc
->SCp
.phase
!= session
->age
) {
2133 spin_unlock_bh(&session
->frwd_lock
);
2134 mutex_unlock(&session
->eh_mutex
);
2135 ISCSI_DBG_EH(session
, "failing abort due to dropped "
2140 conn
= session
->leadconn
;
2141 conn
->eh_abort_cnt
++;
2144 task
= (struct iscsi_task
*)sc
->SCp
.ptr
;
2145 ISCSI_DBG_EH(session
, "aborting [sc %p itt 0x%x]\n",
2148 /* task completed before time out */
2150 ISCSI_DBG_EH(session
, "sc completed while abort in progress\n");
2154 if (task
->state
== ISCSI_TASK_PENDING
) {
2155 fail_scsi_task(task
, DID_ABORT
);
2159 /* only have one tmf outstanding at a time */
2160 if (conn
->tmf_state
!= TMF_INITIAL
)
2162 conn
->tmf_state
= TMF_QUEUED
;
2165 iscsi_prep_abort_task_pdu(task
, hdr
);
2167 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, age
, session
->abort_timeout
)) {
2172 switch (conn
->tmf_state
) {
2174 spin_unlock_bh(&session
->frwd_lock
);
2176 * stop tx side incase the target had sent a abort rsp but
2177 * the initiator was still writing out data.
2179 iscsi_suspend_tx(conn
);
2181 * we do not stop the recv side because targets have been
2182 * good and have never sent us a successful tmf response
2183 * then sent more data for the cmd.
2185 spin_lock_bh(&session
->frwd_lock
);
2186 fail_scsi_task(task
, DID_ABORT
);
2187 conn
->tmf_state
= TMF_INITIAL
;
2188 memset(hdr
, 0, sizeof(*hdr
));
2189 spin_unlock_bh(&session
->frwd_lock
);
2190 iscsi_start_tx(conn
);
2191 goto success_unlocked
;
2193 spin_unlock_bh(&session
->frwd_lock
);
2194 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2195 goto failed_unlocked
;
2198 conn
->tmf_state
= TMF_INITIAL
;
2199 memset(hdr
, 0, sizeof(*hdr
));
2200 /* task completed before tmf abort response */
2201 ISCSI_DBG_EH(session
, "sc completed while abort in "
2207 conn
->tmf_state
= TMF_INITIAL
;
2212 spin_unlock_bh(&session
->frwd_lock
);
2214 ISCSI_DBG_EH(session
, "abort success [sc %p itt 0x%x]\n",
2216 mutex_unlock(&session
->eh_mutex
);
2220 spin_unlock_bh(&session
->frwd_lock
);
2222 ISCSI_DBG_EH(session
, "abort failed [sc %p itt 0x%x]\n", sc
,
2223 task
? task
->itt
: 0);
2224 mutex_unlock(&session
->eh_mutex
);
2227 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
2229 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
2231 memset(hdr
, 0, sizeof(*hdr
));
2232 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
2233 hdr
->flags
= ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
2234 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2235 int_to_scsilun(sc
->device
->lun
, &hdr
->lun
);
2236 hdr
->rtt
= RESERVED_ITT
;
2239 int iscsi_eh_device_reset(struct scsi_cmnd
*sc
)
2241 struct iscsi_cls_session
*cls_session
;
2242 struct iscsi_session
*session
;
2243 struct iscsi_conn
*conn
;
2244 struct iscsi_tm
*hdr
;
2247 cls_session
= starget_to_session(scsi_target(sc
->device
));
2248 session
= cls_session
->dd_data
;
2250 ISCSI_DBG_EH(session
, "LU Reset [sc %p lun %u]\n", sc
, sc
->device
->lun
);
2252 mutex_lock(&session
->eh_mutex
);
2253 spin_lock_bh(&session
->frwd_lock
);
2255 * Just check if we are not logged in. We cannot check for
2256 * the phase because the reset could come from a ioctl.
2258 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
2260 conn
= session
->leadconn
;
2262 /* only have one tmf outstanding at a time */
2263 if (conn
->tmf_state
!= TMF_INITIAL
)
2265 conn
->tmf_state
= TMF_QUEUED
;
2268 iscsi_prep_lun_reset_pdu(sc
, hdr
);
2270 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
2271 session
->lu_reset_timeout
)) {
2276 switch (conn
->tmf_state
) {
2280 spin_unlock_bh(&session
->frwd_lock
);
2281 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2284 conn
->tmf_state
= TMF_INITIAL
;
2289 spin_unlock_bh(&session
->frwd_lock
);
2291 iscsi_suspend_tx(conn
);
2293 spin_lock_bh(&session
->frwd_lock
);
2294 memset(hdr
, 0, sizeof(*hdr
));
2295 fail_scsi_tasks(conn
, sc
->device
->lun
, DID_ERROR
);
2296 conn
->tmf_state
= TMF_INITIAL
;
2297 spin_unlock_bh(&session
->frwd_lock
);
2299 iscsi_start_tx(conn
);
2303 spin_unlock_bh(&session
->frwd_lock
);
2305 ISCSI_DBG_EH(session
, "dev reset result = %s\n",
2306 rc
== SUCCESS
? "SUCCESS" : "FAILED");
2307 mutex_unlock(&session
->eh_mutex
);
2310 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset
);
2312 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
2314 struct iscsi_session
*session
= cls_session
->dd_data
;
2316 spin_lock_bh(&session
->frwd_lock
);
2317 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
2318 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
2319 if (session
->leadconn
)
2320 wake_up(&session
->leadconn
->ehwait
);
2322 spin_unlock_bh(&session
->frwd_lock
);
2324 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
2327 * iscsi_eh_session_reset - drop session and attempt relogin
2330 * This function will wait for a relogin, session termination from
2331 * userspace, or a recovery/replacement timeout.
2333 int iscsi_eh_session_reset(struct scsi_cmnd
*sc
)
2335 struct iscsi_cls_session
*cls_session
;
2336 struct iscsi_session
*session
;
2337 struct iscsi_conn
*conn
;
2339 cls_session
= starget_to_session(scsi_target(sc
->device
));
2340 session
= cls_session
->dd_data
;
2341 conn
= session
->leadconn
;
2343 mutex_lock(&session
->eh_mutex
);
2344 spin_lock_bh(&session
->frwd_lock
);
2345 if (session
->state
== ISCSI_STATE_TERMINATE
) {
2347 ISCSI_DBG_EH(session
,
2348 "failing session reset: Could not log back into "
2349 "%s, %s [age %d]\n", session
->targetname
,
2350 conn
->persistent_address
, session
->age
);
2351 spin_unlock_bh(&session
->frwd_lock
);
2352 mutex_unlock(&session
->eh_mutex
);
2356 spin_unlock_bh(&session
->frwd_lock
);
2357 mutex_unlock(&session
->eh_mutex
);
2359 * we drop the lock here but the leadconn cannot be destoyed while
2360 * we are in the scsi eh
2362 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2364 ISCSI_DBG_EH(session
, "wait for relogin\n");
2365 wait_event_interruptible(conn
->ehwait
,
2366 session
->state
== ISCSI_STATE_TERMINATE
||
2367 session
->state
== ISCSI_STATE_LOGGED_IN
||
2368 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
2369 if (signal_pending(current
))
2370 flush_signals(current
);
2372 mutex_lock(&session
->eh_mutex
);
2373 spin_lock_bh(&session
->frwd_lock
);
2374 if (session
->state
== ISCSI_STATE_LOGGED_IN
) {
2375 ISCSI_DBG_EH(session
,
2376 "session reset succeeded for %s,%s\n",
2377 session
->targetname
, conn
->persistent_address
);
2380 spin_unlock_bh(&session
->frwd_lock
);
2381 mutex_unlock(&session
->eh_mutex
);
2384 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset
);
2386 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
2388 memset(hdr
, 0, sizeof(*hdr
));
2389 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
2390 hdr
->flags
= ISCSI_TM_FUNC_TARGET_WARM_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
2391 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2392 hdr
->rtt
= RESERVED_ITT
;
2396 * iscsi_eh_target_reset - reset target
2399 * This will attempt to send a warm target reset.
2401 int iscsi_eh_target_reset(struct scsi_cmnd
*sc
)
2403 struct iscsi_cls_session
*cls_session
;
2404 struct iscsi_session
*session
;
2405 struct iscsi_conn
*conn
;
2406 struct iscsi_tm
*hdr
;
2409 cls_session
= starget_to_session(scsi_target(sc
->device
));
2410 session
= cls_session
->dd_data
;
2412 ISCSI_DBG_EH(session
, "tgt Reset [sc %p tgt %s]\n", sc
,
2413 session
->targetname
);
2415 mutex_lock(&session
->eh_mutex
);
2416 spin_lock_bh(&session
->frwd_lock
);
2418 * Just check if we are not logged in. We cannot check for
2419 * the phase because the reset could come from a ioctl.
2421 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
2423 conn
= session
->leadconn
;
2425 /* only have one tmf outstanding at a time */
2426 if (conn
->tmf_state
!= TMF_INITIAL
)
2428 conn
->tmf_state
= TMF_QUEUED
;
2431 iscsi_prep_tgt_reset_pdu(sc
, hdr
);
2433 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
2434 session
->tgt_reset_timeout
)) {
2439 switch (conn
->tmf_state
) {
2443 spin_unlock_bh(&session
->frwd_lock
);
2444 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2447 conn
->tmf_state
= TMF_INITIAL
;
2452 spin_unlock_bh(&session
->frwd_lock
);
2454 iscsi_suspend_tx(conn
);
2456 spin_lock_bh(&session
->frwd_lock
);
2457 memset(hdr
, 0, sizeof(*hdr
));
2458 fail_scsi_tasks(conn
, -1, DID_ERROR
);
2459 conn
->tmf_state
= TMF_INITIAL
;
2460 spin_unlock_bh(&session
->frwd_lock
);
2462 iscsi_start_tx(conn
);
2466 spin_unlock_bh(&session
->frwd_lock
);
2468 ISCSI_DBG_EH(session
, "tgt %s reset result = %s\n", session
->targetname
,
2469 rc
== SUCCESS
? "SUCCESS" : "FAILED");
2470 mutex_unlock(&session
->eh_mutex
);
2473 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset
);
2476 * iscsi_eh_recover_target - reset target and possibly the session
2479 * This will attempt to send a warm target reset. If that fails,
2480 * we will escalate to ERL0 session recovery.
2482 int iscsi_eh_recover_target(struct scsi_cmnd
*sc
)
2486 rc
= iscsi_eh_target_reset(sc
);
2488 rc
= iscsi_eh_session_reset(sc
);
2491 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target
);
2494 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2495 * should be accessed via kfifo_{get,put} on q->queue.
2496 * Optionally, the caller can obtain the array of object pointers
2497 * by passing in a non-NULL @items pointer
2500 iscsi_pool_init(struct iscsi_pool
*q
, int max
, void ***items
, int item_size
)
2502 int i
, num_arrays
= 1;
2504 memset(q
, 0, sizeof(*q
));
2508 /* If the user passed an items pointer, he wants a copy of
2512 q
->pool
= kzalloc(num_arrays
* max
* sizeof(void*), GFP_KERNEL
);
2513 if (q
->pool
== NULL
)
2516 kfifo_init(&q
->queue
, (void*)q
->pool
, max
* sizeof(void*));
2518 for (i
= 0; i
< max
; i
++) {
2519 q
->pool
[i
] = kzalloc(item_size
, GFP_KERNEL
);
2520 if (q
->pool
[i
] == NULL
) {
2524 kfifo_in(&q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
2528 *items
= q
->pool
+ max
;
2529 memcpy(*items
, q
->pool
, max
* sizeof(void *));
2538 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
2540 void iscsi_pool_free(struct iscsi_pool
*q
)
2544 for (i
= 0; i
< q
->max
; i
++)
2548 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
2551 * iscsi_host_add - add host to system
2553 * @pdev: parent device
2555 * This should be called by partial offload and software iscsi drivers
2556 * to add a host to the system.
2558 int iscsi_host_add(struct Scsi_Host
*shost
, struct device
*pdev
)
2560 if (!shost
->can_queue
)
2561 shost
->can_queue
= ISCSI_DEF_XMIT_CMDS_MAX
;
2563 if (!shost
->cmd_per_lun
)
2564 shost
->cmd_per_lun
= ISCSI_DEF_CMD_PER_LUN
;
2566 if (!shost
->transportt
->eh_timed_out
)
2567 shost
->transportt
->eh_timed_out
= iscsi_eh_cmd_timed_out
;
2568 return scsi_add_host(shost
, pdev
);
2570 EXPORT_SYMBOL_GPL(iscsi_host_add
);
2573 * iscsi_host_alloc - allocate a host and driver data
2574 * @sht: scsi host template
2575 * @dd_data_size: driver host data size
2576 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2578 * This should be called by partial offload and software iscsi drivers.
2579 * To access the driver specific memory use the iscsi_host_priv() macro.
2581 struct Scsi_Host
*iscsi_host_alloc(struct scsi_host_template
*sht
,
2582 int dd_data_size
, bool xmit_can_sleep
)
2584 struct Scsi_Host
*shost
;
2585 struct iscsi_host
*ihost
;
2587 shost
= scsi_host_alloc(sht
, sizeof(struct iscsi_host
) + dd_data_size
);
2590 ihost
= shost_priv(shost
);
2592 if (xmit_can_sleep
) {
2593 snprintf(ihost
->workq_name
, sizeof(ihost
->workq_name
),
2594 "iscsi_q_%d", shost
->host_no
);
2595 ihost
->workq
= create_singlethread_workqueue(ihost
->workq_name
);
2600 spin_lock_init(&ihost
->lock
);
2601 ihost
->state
= ISCSI_HOST_SETUP
;
2602 ihost
->num_sessions
= 0;
2603 init_waitqueue_head(&ihost
->session_removal_wq
);
2607 scsi_host_put(shost
);
2610 EXPORT_SYMBOL_GPL(iscsi_host_alloc
);
2612 static void iscsi_notify_host_removed(struct iscsi_cls_session
*cls_session
)
2614 iscsi_session_failure(cls_session
->dd_data
, ISCSI_ERR_INVALID_HOST
);
2618 * iscsi_host_remove - remove host and sessions
2621 * If there are any sessions left, this will initiate the removal and wait
2622 * for the completion.
2624 void iscsi_host_remove(struct Scsi_Host
*shost
)
2626 struct iscsi_host
*ihost
= shost_priv(shost
);
2627 unsigned long flags
;
2629 spin_lock_irqsave(&ihost
->lock
, flags
);
2630 ihost
->state
= ISCSI_HOST_REMOVED
;
2631 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2633 iscsi_host_for_each_session(shost
, iscsi_notify_host_removed
);
2634 wait_event_interruptible(ihost
->session_removal_wq
,
2635 ihost
->num_sessions
== 0);
2636 if (signal_pending(current
))
2637 flush_signals(current
);
2639 scsi_remove_host(shost
);
2641 destroy_workqueue(ihost
->workq
);
2643 EXPORT_SYMBOL_GPL(iscsi_host_remove
);
2645 void iscsi_host_free(struct Scsi_Host
*shost
)
2647 struct iscsi_host
*ihost
= shost_priv(shost
);
2649 kfree(ihost
->netdev
);
2650 kfree(ihost
->hwaddress
);
2651 kfree(ihost
->initiatorname
);
2652 scsi_host_put(shost
);
2654 EXPORT_SYMBOL_GPL(iscsi_host_free
);
2656 static void iscsi_host_dec_session_cnt(struct Scsi_Host
*shost
)
2658 struct iscsi_host
*ihost
= shost_priv(shost
);
2659 unsigned long flags
;
2661 shost
= scsi_host_get(shost
);
2663 printk(KERN_ERR
"Invalid state. Cannot notify host removal "
2664 "of session teardown event because host already "
2669 spin_lock_irqsave(&ihost
->lock
, flags
);
2670 ihost
->num_sessions
--;
2671 if (ihost
->num_sessions
== 0)
2672 wake_up(&ihost
->session_removal_wq
);
2673 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2674 scsi_host_put(shost
);
2678 * iscsi_session_setup - create iscsi cls session and host and session
2679 * @iscsit: iscsi transport template
2681 * @cmds_max: session can queue
2682 * @cmd_task_size: LLD task private data size
2683 * @initial_cmdsn: initial CmdSN
2685 * This can be used by software iscsi_transports that allocate
2686 * a session per scsi host.
2688 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2689 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2690 * for nop handling and login/logout requests.
2692 struct iscsi_cls_session
*
2693 iscsi_session_setup(struct iscsi_transport
*iscsit
, struct Scsi_Host
*shost
,
2694 uint16_t cmds_max
, int dd_size
, int cmd_task_size
,
2695 uint32_t initial_cmdsn
, unsigned int id
)
2697 struct iscsi_host
*ihost
= shost_priv(shost
);
2698 struct iscsi_session
*session
;
2699 struct iscsi_cls_session
*cls_session
;
2700 int cmd_i
, scsi_cmds
, total_cmds
= cmds_max
;
2701 unsigned long flags
;
2703 spin_lock_irqsave(&ihost
->lock
, flags
);
2704 if (ihost
->state
== ISCSI_HOST_REMOVED
) {
2705 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2708 ihost
->num_sessions
++;
2709 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2712 total_cmds
= ISCSI_DEF_XMIT_CMDS_MAX
;
2714 * The iscsi layer needs some tasks for nop handling and tmfs,
2715 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2716 * + 1 command for scsi IO.
2718 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
) {
2719 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2720 "must be a power of two that is at least %d.\n",
2721 total_cmds
, ISCSI_TOTAL_CMDS_MIN
);
2722 goto dec_session_count
;
2725 if (total_cmds
> ISCSI_TOTAL_CMDS_MAX
) {
2726 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2727 "must be a power of 2 less than or equal to %d.\n",
2728 cmds_max
, ISCSI_TOTAL_CMDS_MAX
);
2729 total_cmds
= ISCSI_TOTAL_CMDS_MAX
;
2732 if (!is_power_of_2(total_cmds
)) {
2733 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2734 "must be a power of 2.\n", total_cmds
);
2735 total_cmds
= rounddown_pow_of_two(total_cmds
);
2736 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
)
2738 printk(KERN_INFO
"iscsi: Rounding can_queue to %d.\n",
2741 scsi_cmds
= total_cmds
- ISCSI_MGMT_CMDS_MAX
;
2743 cls_session
= iscsi_alloc_session(shost
, iscsit
,
2744 sizeof(struct iscsi_session
) +
2747 goto dec_session_count
;
2748 session
= cls_session
->dd_data
;
2749 session
->cls_session
= cls_session
;
2750 session
->host
= shost
;
2751 session
->state
= ISCSI_STATE_FREE
;
2752 session
->fast_abort
= 1;
2753 session
->tgt_reset_timeout
= 30;
2754 session
->lu_reset_timeout
= 15;
2755 session
->abort_timeout
= 10;
2756 session
->scsi_cmds_max
= scsi_cmds
;
2757 session
->cmds_max
= total_cmds
;
2758 session
->queued_cmdsn
= session
->cmdsn
= initial_cmdsn
;
2759 session
->exp_cmdsn
= initial_cmdsn
+ 1;
2760 session
->max_cmdsn
= initial_cmdsn
+ 1;
2761 session
->max_r2t
= 1;
2762 session
->tt
= iscsit
;
2763 session
->dd_data
= cls_session
->dd_data
+ sizeof(*session
);
2765 mutex_init(&session
->eh_mutex
);
2766 spin_lock_init(&session
->frwd_lock
);
2767 spin_lock_init(&session
->back_lock
);
2769 /* initialize SCSI PDU commands pool */
2770 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
2771 (void***)&session
->cmds
,
2772 cmd_task_size
+ sizeof(struct iscsi_task
)))
2773 goto cmdpool_alloc_fail
;
2775 /* pre-format cmds pool with ITT */
2776 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
2777 struct iscsi_task
*task
= session
->cmds
[cmd_i
];
2780 task
->dd_data
= &task
[1];
2782 task
->state
= ISCSI_TASK_FREE
;
2783 INIT_LIST_HEAD(&task
->running
);
2786 if (!try_module_get(iscsit
->owner
))
2787 goto module_get_fail
;
2789 if (iscsi_add_session(cls_session
, id
))
2790 goto cls_session_fail
;
2795 module_put(iscsit
->owner
);
2797 iscsi_pool_free(&session
->cmdpool
);
2799 iscsi_free_session(cls_session
);
2801 iscsi_host_dec_session_cnt(shost
);
2804 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
2807 * iscsi_session_teardown - destroy session, host, and cls_session
2808 * @cls_session: iscsi session
2810 * The driver must have called iscsi_remove_session before
2813 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
2815 struct iscsi_session
*session
= cls_session
->dd_data
;
2816 struct module
*owner
= cls_session
->transport
->owner
;
2817 struct Scsi_Host
*shost
= session
->host
;
2819 iscsi_pool_free(&session
->cmdpool
);
2821 kfree(session
->password
);
2822 kfree(session
->password_in
);
2823 kfree(session
->username
);
2824 kfree(session
->username_in
);
2825 kfree(session
->targetname
);
2826 kfree(session
->targetalias
);
2827 kfree(session
->initiatorname
);
2828 kfree(session
->boot_root
);
2829 kfree(session
->boot_nic
);
2830 kfree(session
->boot_target
);
2831 kfree(session
->ifacename
);
2832 kfree(session
->portal_type
);
2833 kfree(session
->discovery_parent_type
);
2835 iscsi_destroy_session(cls_session
);
2836 iscsi_host_dec_session_cnt(shost
);
2839 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
2842 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2843 * @cls_session: iscsi_cls_session
2844 * @dd_size: private driver data size
2847 struct iscsi_cls_conn
*
2848 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, int dd_size
,
2851 struct iscsi_session
*session
= cls_session
->dd_data
;
2852 struct iscsi_conn
*conn
;
2853 struct iscsi_cls_conn
*cls_conn
;
2856 cls_conn
= iscsi_create_conn(cls_session
, sizeof(*conn
) + dd_size
,
2860 conn
= cls_conn
->dd_data
;
2861 memset(conn
, 0, sizeof(*conn
) + dd_size
);
2863 conn
->dd_data
= cls_conn
->dd_data
+ sizeof(*conn
);
2864 conn
->session
= session
;
2865 conn
->cls_conn
= cls_conn
;
2866 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
2867 conn
->id
= conn_idx
;
2868 conn
->exp_statsn
= 0;
2869 conn
->tmf_state
= TMF_INITIAL
;
2871 init_timer(&conn
->transport_timer
);
2872 conn
->transport_timer
.data
= (unsigned long)conn
;
2873 conn
->transport_timer
.function
= iscsi_check_transport_timeouts
;
2875 INIT_LIST_HEAD(&conn
->mgmtqueue
);
2876 INIT_LIST_HEAD(&conn
->cmdqueue
);
2877 INIT_LIST_HEAD(&conn
->requeue
);
2878 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
2880 /* allocate login_task used for the login/text sequences */
2881 spin_lock_bh(&session
->frwd_lock
);
2882 if (!kfifo_out(&session
->cmdpool
.queue
,
2883 (void*)&conn
->login_task
,
2885 spin_unlock_bh(&session
->frwd_lock
);
2886 goto login_task_alloc_fail
;
2888 spin_unlock_bh(&session
->frwd_lock
);
2890 data
= (char *) __get_free_pages(GFP_KERNEL
,
2891 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN
));
2893 goto login_task_data_alloc_fail
;
2894 conn
->login_task
->data
= conn
->data
= data
;
2896 init_timer(&conn
->tmf_timer
);
2897 init_waitqueue_head(&conn
->ehwait
);
2901 login_task_data_alloc_fail
:
2902 kfifo_in(&session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2904 login_task_alloc_fail
:
2905 iscsi_destroy_conn(cls_conn
);
2908 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
2911 * iscsi_conn_teardown - teardown iscsi connection
2912 * cls_conn: iscsi class connection
2914 * TODO: we may need to make this into a two step process
2915 * like scsi-mls remove + put host
2917 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
2919 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2920 struct iscsi_session
*session
= conn
->session
;
2921 unsigned long flags
;
2923 del_timer_sync(&conn
->transport_timer
);
2925 spin_lock_bh(&session
->frwd_lock
);
2926 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
2927 if (session
->leadconn
== conn
) {
2929 * leading connection? then give up on recovery.
2931 session
->state
= ISCSI_STATE_TERMINATE
;
2932 wake_up(&conn
->ehwait
);
2934 spin_unlock_bh(&session
->frwd_lock
);
2937 * Block until all in-progress commands for this connection
2941 spin_lock_irqsave(session
->host
->host_lock
, flags
);
2942 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
2943 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2946 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2947 msleep_interruptible(500);
2948 iscsi_conn_printk(KERN_INFO
, conn
, "iscsi conn_destroy(): "
2949 "host_busy %d host_failed %d\n",
2950 session
->host
->host_busy
,
2951 session
->host
->host_failed
);
2953 * force eh_abort() to unblock
2955 wake_up(&conn
->ehwait
);
2958 /* flush queued up work because we free the connection below */
2959 iscsi_suspend_tx(conn
);
2961 spin_lock_bh(&session
->frwd_lock
);
2962 free_pages((unsigned long) conn
->data
,
2963 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN
));
2964 kfree(conn
->persistent_address
);
2965 kfree(conn
->local_ipaddr
);
2966 /* regular RX path uses back_lock */
2967 spin_lock_bh(&session
->back_lock
);
2968 kfifo_in(&session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2970 spin_unlock_bh(&session
->back_lock
);
2971 if (session
->leadconn
== conn
)
2972 session
->leadconn
= NULL
;
2973 spin_unlock_bh(&session
->frwd_lock
);
2975 iscsi_destroy_conn(cls_conn
);
2977 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
2979 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
2981 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2982 struct iscsi_session
*session
= conn
->session
;
2985 iscsi_conn_printk(KERN_ERR
, conn
,
2986 "can't start unbound connection\n");
2990 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
2991 session
->first_burst
> session
->max_burst
) {
2992 iscsi_conn_printk(KERN_INFO
, conn
, "invalid burst lengths: "
2993 "first_burst %d max_burst %d\n",
2994 session
->first_burst
, session
->max_burst
);
2998 if (conn
->ping_timeout
&& !conn
->recv_timeout
) {
2999 iscsi_conn_printk(KERN_ERR
, conn
, "invalid recv timeout of "
3000 "zero. Using 5 seconds\n.");
3001 conn
->recv_timeout
= 5;
3004 if (conn
->recv_timeout
&& !conn
->ping_timeout
) {
3005 iscsi_conn_printk(KERN_ERR
, conn
, "invalid ping timeout of "
3006 "zero. Using 5 seconds.\n");
3007 conn
->ping_timeout
= 5;
3010 spin_lock_bh(&session
->frwd_lock
);
3011 conn
->c_stage
= ISCSI_CONN_STARTED
;
3012 session
->state
= ISCSI_STATE_LOGGED_IN
;
3013 session
->queued_cmdsn
= session
->cmdsn
;
3015 conn
->last_recv
= jiffies
;
3016 conn
->last_ping
= jiffies
;
3017 if (conn
->recv_timeout
&& conn
->ping_timeout
)
3018 mod_timer(&conn
->transport_timer
,
3019 jiffies
+ (conn
->recv_timeout
* HZ
));
3021 switch(conn
->stop_stage
) {
3022 case STOP_CONN_RECOVER
:
3024 * unblock eh_abort() if it is blocked. re-try all
3025 * commands after successful recovery
3027 conn
->stop_stage
= 0;
3028 conn
->tmf_state
= TMF_INITIAL
;
3030 if (session
->age
== 16)
3033 case STOP_CONN_TERM
:
3034 conn
->stop_stage
= 0;
3039 spin_unlock_bh(&session
->frwd_lock
);
3041 iscsi_unblock_session(session
->cls_session
);
3042 wake_up(&conn
->ehwait
);
3045 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
3048 fail_mgmt_tasks(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
3050 struct iscsi_task
*task
;
3053 for (i
= 0; i
< conn
->session
->cmds_max
; i
++) {
3054 task
= conn
->session
->cmds
[i
];
3058 if (task
->state
== ISCSI_TASK_FREE
)
3061 ISCSI_DBG_SESSION(conn
->session
,
3062 "failing mgmt itt 0x%x state %d\n",
3063 task
->itt
, task
->state
);
3064 state
= ISCSI_TASK_ABRT_SESS_RECOV
;
3065 if (task
->state
== ISCSI_TASK_PENDING
)
3066 state
= ISCSI_TASK_COMPLETED
;
3067 iscsi_complete_task(task
, state
);
3072 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
3073 struct iscsi_conn
*conn
, int flag
)
3077 mutex_lock(&session
->eh_mutex
);
3078 spin_lock_bh(&session
->frwd_lock
);
3079 if (conn
->stop_stage
== STOP_CONN_TERM
) {
3080 spin_unlock_bh(&session
->frwd_lock
);
3081 mutex_unlock(&session
->eh_mutex
);
3086 * When this is called for the in_login state, we only want to clean
3087 * up the login task and connection. We do not need to block and set
3088 * the recovery state again
3090 if (flag
== STOP_CONN_TERM
)
3091 session
->state
= ISCSI_STATE_TERMINATE
;
3092 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
3093 session
->state
= ISCSI_STATE_IN_RECOVERY
;
3095 old_stop_stage
= conn
->stop_stage
;
3096 conn
->stop_stage
= flag
;
3097 spin_unlock_bh(&session
->frwd_lock
);
3099 del_timer_sync(&conn
->transport_timer
);
3100 iscsi_suspend_tx(conn
);
3102 spin_lock_bh(&session
->frwd_lock
);
3103 conn
->c_stage
= ISCSI_CONN_STOPPED
;
3104 spin_unlock_bh(&session
->frwd_lock
);
3107 * for connection level recovery we should not calculate
3108 * header digest. conn->hdr_size used for optimization
3109 * in hdr_extract() and will be re-negotiated at
3112 if (flag
== STOP_CONN_RECOVER
) {
3113 conn
->hdrdgst_en
= 0;
3114 conn
->datadgst_en
= 0;
3115 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
3116 old_stop_stage
!= STOP_CONN_RECOVER
) {
3117 ISCSI_DBG_SESSION(session
, "blocking session\n");
3118 iscsi_block_session(session
->cls_session
);
3125 spin_lock_bh(&session
->frwd_lock
);
3126 fail_scsi_tasks(conn
, -1, DID_TRANSPORT_DISRUPTED
);
3127 fail_mgmt_tasks(session
, conn
);
3128 memset(&conn
->tmhdr
, 0, sizeof(conn
->tmhdr
));
3129 spin_unlock_bh(&session
->frwd_lock
);
3130 mutex_unlock(&session
->eh_mutex
);
3133 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
3135 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3136 struct iscsi_session
*session
= conn
->session
;
3139 case STOP_CONN_RECOVER
:
3140 case STOP_CONN_TERM
:
3141 iscsi_start_session_recovery(session
, conn
, flag
);
3144 iscsi_conn_printk(KERN_ERR
, conn
,
3145 "invalid stop flag %d\n", flag
);
3148 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
3150 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
3151 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
3153 struct iscsi_session
*session
= cls_session
->dd_data
;
3154 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3156 spin_lock_bh(&session
->frwd_lock
);
3158 session
->leadconn
= conn
;
3159 spin_unlock_bh(&session
->frwd_lock
);
3162 * Unblock xmitworker(), Login Phase will pass through.
3164 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
3165 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
3168 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
3170 int iscsi_switch_str_param(char **param
, char *new_val_buf
)
3175 if (!strcmp(*param
, new_val_buf
))
3179 new_val
= kstrdup(new_val_buf
, GFP_NOIO
);
3187 EXPORT_SYMBOL_GPL(iscsi_switch_str_param
);
3189 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
3190 enum iscsi_param param
, char *buf
, int buflen
)
3192 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3193 struct iscsi_session
*session
= conn
->session
;
3197 case ISCSI_PARAM_FAST_ABORT
:
3198 sscanf(buf
, "%d", &session
->fast_abort
);
3200 case ISCSI_PARAM_ABORT_TMO
:
3201 sscanf(buf
, "%d", &session
->abort_timeout
);
3203 case ISCSI_PARAM_LU_RESET_TMO
:
3204 sscanf(buf
, "%d", &session
->lu_reset_timeout
);
3206 case ISCSI_PARAM_TGT_RESET_TMO
:
3207 sscanf(buf
, "%d", &session
->tgt_reset_timeout
);
3209 case ISCSI_PARAM_PING_TMO
:
3210 sscanf(buf
, "%d", &conn
->ping_timeout
);
3212 case ISCSI_PARAM_RECV_TMO
:
3213 sscanf(buf
, "%d", &conn
->recv_timeout
);
3215 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
3216 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
3218 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
3219 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
3221 case ISCSI_PARAM_HDRDGST_EN
:
3222 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
3224 case ISCSI_PARAM_DATADGST_EN
:
3225 sscanf(buf
, "%d", &conn
->datadgst_en
);
3227 case ISCSI_PARAM_INITIAL_R2T_EN
:
3228 sscanf(buf
, "%d", &session
->initial_r2t_en
);
3230 case ISCSI_PARAM_MAX_R2T
:
3231 sscanf(buf
, "%hu", &session
->max_r2t
);
3233 case ISCSI_PARAM_IMM_DATA_EN
:
3234 sscanf(buf
, "%d", &session
->imm_data_en
);
3236 case ISCSI_PARAM_FIRST_BURST
:
3237 sscanf(buf
, "%d", &session
->first_burst
);
3239 case ISCSI_PARAM_MAX_BURST
:
3240 sscanf(buf
, "%d", &session
->max_burst
);
3242 case ISCSI_PARAM_PDU_INORDER_EN
:
3243 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
3245 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
3246 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
3248 case ISCSI_PARAM_ERL
:
3249 sscanf(buf
, "%d", &session
->erl
);
3251 case ISCSI_PARAM_EXP_STATSN
:
3252 sscanf(buf
, "%u", &conn
->exp_statsn
);
3254 case ISCSI_PARAM_USERNAME
:
3255 return iscsi_switch_str_param(&session
->username
, buf
);
3256 case ISCSI_PARAM_USERNAME_IN
:
3257 return iscsi_switch_str_param(&session
->username_in
, buf
);
3258 case ISCSI_PARAM_PASSWORD
:
3259 return iscsi_switch_str_param(&session
->password
, buf
);
3260 case ISCSI_PARAM_PASSWORD_IN
:
3261 return iscsi_switch_str_param(&session
->password_in
, buf
);
3262 case ISCSI_PARAM_TARGET_NAME
:
3263 return iscsi_switch_str_param(&session
->targetname
, buf
);
3264 case ISCSI_PARAM_TARGET_ALIAS
:
3265 return iscsi_switch_str_param(&session
->targetalias
, buf
);
3266 case ISCSI_PARAM_TPGT
:
3267 sscanf(buf
, "%d", &session
->tpgt
);
3269 case ISCSI_PARAM_PERSISTENT_PORT
:
3270 sscanf(buf
, "%d", &conn
->persistent_port
);
3272 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
3273 return iscsi_switch_str_param(&conn
->persistent_address
, buf
);
3274 case ISCSI_PARAM_IFACE_NAME
:
3275 return iscsi_switch_str_param(&session
->ifacename
, buf
);
3276 case ISCSI_PARAM_INITIATOR_NAME
:
3277 return iscsi_switch_str_param(&session
->initiatorname
, buf
);
3278 case ISCSI_PARAM_BOOT_ROOT
:
3279 return iscsi_switch_str_param(&session
->boot_root
, buf
);
3280 case ISCSI_PARAM_BOOT_NIC
:
3281 return iscsi_switch_str_param(&session
->boot_nic
, buf
);
3282 case ISCSI_PARAM_BOOT_TARGET
:
3283 return iscsi_switch_str_param(&session
->boot_target
, buf
);
3284 case ISCSI_PARAM_PORTAL_TYPE
:
3285 return iscsi_switch_str_param(&session
->portal_type
, buf
);
3286 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE
:
3287 return iscsi_switch_str_param(&session
->discovery_parent_type
,
3289 case ISCSI_PARAM_DISCOVERY_SESS
:
3290 sscanf(buf
, "%d", &val
);
3291 session
->discovery_sess
= !!val
;
3293 case ISCSI_PARAM_LOCAL_IPADDR
:
3294 return iscsi_switch_str_param(&conn
->local_ipaddr
, buf
);
3301 EXPORT_SYMBOL_GPL(iscsi_set_param
);
3303 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
3304 enum iscsi_param param
, char *buf
)
3306 struct iscsi_session
*session
= cls_session
->dd_data
;
3310 case ISCSI_PARAM_FAST_ABORT
:
3311 len
= sprintf(buf
, "%d\n", session
->fast_abort
);
3313 case ISCSI_PARAM_ABORT_TMO
:
3314 len
= sprintf(buf
, "%d\n", session
->abort_timeout
);
3316 case ISCSI_PARAM_LU_RESET_TMO
:
3317 len
= sprintf(buf
, "%d\n", session
->lu_reset_timeout
);
3319 case ISCSI_PARAM_TGT_RESET_TMO
:
3320 len
= sprintf(buf
, "%d\n", session
->tgt_reset_timeout
);
3322 case ISCSI_PARAM_INITIAL_R2T_EN
:
3323 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
3325 case ISCSI_PARAM_MAX_R2T
:
3326 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
3328 case ISCSI_PARAM_IMM_DATA_EN
:
3329 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
3331 case ISCSI_PARAM_FIRST_BURST
:
3332 len
= sprintf(buf
, "%u\n", session
->first_burst
);
3334 case ISCSI_PARAM_MAX_BURST
:
3335 len
= sprintf(buf
, "%u\n", session
->max_burst
);
3337 case ISCSI_PARAM_PDU_INORDER_EN
:
3338 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
3340 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
3341 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
3343 case ISCSI_PARAM_DEF_TASKMGMT_TMO
:
3344 len
= sprintf(buf
, "%d\n", session
->def_taskmgmt_tmo
);
3346 case ISCSI_PARAM_ERL
:
3347 len
= sprintf(buf
, "%d\n", session
->erl
);
3349 case ISCSI_PARAM_TARGET_NAME
:
3350 len
= sprintf(buf
, "%s\n", session
->targetname
);
3352 case ISCSI_PARAM_TARGET_ALIAS
:
3353 len
= sprintf(buf
, "%s\n", session
->targetalias
);
3355 case ISCSI_PARAM_TPGT
:
3356 len
= sprintf(buf
, "%d\n", session
->tpgt
);
3358 case ISCSI_PARAM_USERNAME
:
3359 len
= sprintf(buf
, "%s\n", session
->username
);
3361 case ISCSI_PARAM_USERNAME_IN
:
3362 len
= sprintf(buf
, "%s\n", session
->username_in
);
3364 case ISCSI_PARAM_PASSWORD
:
3365 len
= sprintf(buf
, "%s\n", session
->password
);
3367 case ISCSI_PARAM_PASSWORD_IN
:
3368 len
= sprintf(buf
, "%s\n", session
->password_in
);
3370 case ISCSI_PARAM_IFACE_NAME
:
3371 len
= sprintf(buf
, "%s\n", session
->ifacename
);
3373 case ISCSI_PARAM_INITIATOR_NAME
:
3374 len
= sprintf(buf
, "%s\n", session
->initiatorname
);
3376 case ISCSI_PARAM_BOOT_ROOT
:
3377 len
= sprintf(buf
, "%s\n", session
->boot_root
);
3379 case ISCSI_PARAM_BOOT_NIC
:
3380 len
= sprintf(buf
, "%s\n", session
->boot_nic
);
3382 case ISCSI_PARAM_BOOT_TARGET
:
3383 len
= sprintf(buf
, "%s\n", session
->boot_target
);
3385 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE
:
3386 len
= sprintf(buf
, "%u\n", session
->auto_snd_tgt_disable
);
3388 case ISCSI_PARAM_DISCOVERY_SESS
:
3389 len
= sprintf(buf
, "%u\n", session
->discovery_sess
);
3391 case ISCSI_PARAM_PORTAL_TYPE
:
3392 len
= sprintf(buf
, "%s\n", session
->portal_type
);
3394 case ISCSI_PARAM_CHAP_AUTH_EN
:
3395 len
= sprintf(buf
, "%u\n", session
->chap_auth_en
);
3397 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN
:
3398 len
= sprintf(buf
, "%u\n", session
->discovery_logout_en
);
3400 case ISCSI_PARAM_BIDI_CHAP_EN
:
3401 len
= sprintf(buf
, "%u\n", session
->bidi_chap_en
);
3403 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL
:
3404 len
= sprintf(buf
, "%u\n", session
->discovery_auth_optional
);
3406 case ISCSI_PARAM_DEF_TIME2WAIT
:
3407 len
= sprintf(buf
, "%d\n", session
->time2wait
);
3409 case ISCSI_PARAM_DEF_TIME2RETAIN
:
3410 len
= sprintf(buf
, "%d\n", session
->time2retain
);
3412 case ISCSI_PARAM_TSID
:
3413 len
= sprintf(buf
, "%u\n", session
->tsid
);
3415 case ISCSI_PARAM_ISID
:
3416 len
= sprintf(buf
, "%02x%02x%02x%02x%02x%02x\n",
3417 session
->isid
[0], session
->isid
[1],
3418 session
->isid
[2], session
->isid
[3],
3419 session
->isid
[4], session
->isid
[5]);
3421 case ISCSI_PARAM_DISCOVERY_PARENT_IDX
:
3422 len
= sprintf(buf
, "%u\n", session
->discovery_parent_idx
);
3424 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE
:
3425 if (session
->discovery_parent_type
)
3426 len
= sprintf(buf
, "%s\n",
3427 session
->discovery_parent_type
);
3429 len
= sprintf(buf
, "\n");
3437 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
3439 int iscsi_conn_get_addr_param(struct sockaddr_storage
*addr
,
3440 enum iscsi_param param
, char *buf
)
3442 struct sockaddr_in6
*sin6
= NULL
;
3443 struct sockaddr_in
*sin
= NULL
;
3446 switch (addr
->ss_family
) {
3448 sin
= (struct sockaddr_in
*)addr
;
3451 sin6
= (struct sockaddr_in6
*)addr
;
3458 case ISCSI_PARAM_CONN_ADDRESS
:
3459 case ISCSI_HOST_PARAM_IPADDRESS
:
3461 len
= sprintf(buf
, "%pI4\n", &sin
->sin_addr
.s_addr
);
3463 len
= sprintf(buf
, "%pI6\n", &sin6
->sin6_addr
);
3465 case ISCSI_PARAM_CONN_PORT
:
3467 len
= sprintf(buf
, "%hu\n", be16_to_cpu(sin
->sin_port
));
3469 len
= sprintf(buf
, "%hu\n",
3470 be16_to_cpu(sin6
->sin6_port
));
3478 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param
);
3480 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
3481 enum iscsi_param param
, char *buf
)
3483 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3487 case ISCSI_PARAM_PING_TMO
:
3488 len
= sprintf(buf
, "%u\n", conn
->ping_timeout
);
3490 case ISCSI_PARAM_RECV_TMO
:
3491 len
= sprintf(buf
, "%u\n", conn
->recv_timeout
);
3493 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
3494 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
3496 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
3497 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
3499 case ISCSI_PARAM_HDRDGST_EN
:
3500 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
3502 case ISCSI_PARAM_DATADGST_EN
:
3503 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
3505 case ISCSI_PARAM_IFMARKER_EN
:
3506 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
3508 case ISCSI_PARAM_OFMARKER_EN
:
3509 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
3511 case ISCSI_PARAM_EXP_STATSN
:
3512 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
3514 case ISCSI_PARAM_PERSISTENT_PORT
:
3515 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
3517 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
3518 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
3520 case ISCSI_PARAM_STATSN
:
3521 len
= sprintf(buf
, "%u\n", conn
->statsn
);
3523 case ISCSI_PARAM_MAX_SEGMENT_SIZE
:
3524 len
= sprintf(buf
, "%u\n", conn
->max_segment_size
);
3526 case ISCSI_PARAM_KEEPALIVE_TMO
:
3527 len
= sprintf(buf
, "%u\n", conn
->keepalive_tmo
);
3529 case ISCSI_PARAM_LOCAL_PORT
:
3530 len
= sprintf(buf
, "%u\n", conn
->local_port
);
3532 case ISCSI_PARAM_TCP_TIMESTAMP_STAT
:
3533 len
= sprintf(buf
, "%u\n", conn
->tcp_timestamp_stat
);
3535 case ISCSI_PARAM_TCP_NAGLE_DISABLE
:
3536 len
= sprintf(buf
, "%u\n", conn
->tcp_nagle_disable
);
3538 case ISCSI_PARAM_TCP_WSF_DISABLE
:
3539 len
= sprintf(buf
, "%u\n", conn
->tcp_wsf_disable
);
3541 case ISCSI_PARAM_TCP_TIMER_SCALE
:
3542 len
= sprintf(buf
, "%u\n", conn
->tcp_timer_scale
);
3544 case ISCSI_PARAM_TCP_TIMESTAMP_EN
:
3545 len
= sprintf(buf
, "%u\n", conn
->tcp_timestamp_en
);
3547 case ISCSI_PARAM_IP_FRAGMENT_DISABLE
:
3548 len
= sprintf(buf
, "%u\n", conn
->fragment_disable
);
3550 case ISCSI_PARAM_IPV4_TOS
:
3551 len
= sprintf(buf
, "%u\n", conn
->ipv4_tos
);
3553 case ISCSI_PARAM_IPV6_TC
:
3554 len
= sprintf(buf
, "%u\n", conn
->ipv6_traffic_class
);
3556 case ISCSI_PARAM_IPV6_FLOW_LABEL
:
3557 len
= sprintf(buf
, "%u\n", conn
->ipv6_flow_label
);
3559 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6
:
3560 len
= sprintf(buf
, "%u\n", conn
->is_fw_assigned_ipv6
);
3562 case ISCSI_PARAM_TCP_XMIT_WSF
:
3563 len
= sprintf(buf
, "%u\n", conn
->tcp_xmit_wsf
);
3565 case ISCSI_PARAM_TCP_RECV_WSF
:
3566 len
= sprintf(buf
, "%u\n", conn
->tcp_recv_wsf
);
3568 case ISCSI_PARAM_LOCAL_IPADDR
:
3569 len
= sprintf(buf
, "%s\n", conn
->local_ipaddr
);
3577 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
3579 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
3582 struct iscsi_host
*ihost
= shost_priv(shost
);
3586 case ISCSI_HOST_PARAM_NETDEV_NAME
:
3587 len
= sprintf(buf
, "%s\n", ihost
->netdev
);
3589 case ISCSI_HOST_PARAM_HWADDRESS
:
3590 len
= sprintf(buf
, "%s\n", ihost
->hwaddress
);
3592 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
3593 len
= sprintf(buf
, "%s\n", ihost
->initiatorname
);
3601 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
3603 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
3604 char *buf
, int buflen
)
3606 struct iscsi_host
*ihost
= shost_priv(shost
);
3609 case ISCSI_HOST_PARAM_NETDEV_NAME
:
3610 return iscsi_switch_str_param(&ihost
->netdev
, buf
);
3611 case ISCSI_HOST_PARAM_HWADDRESS
:
3612 return iscsi_switch_str_param(&ihost
->hwaddress
, buf
);
3613 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
3614 return iscsi_switch_str_param(&ihost
->initiatorname
, buf
);
3621 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
3623 MODULE_AUTHOR("Mike Christie");
3624 MODULE_DESCRIPTION("iSCSI library functions");
3625 MODULE_LICENSE("GPL");