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
;
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
, transfer_length
;
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
);
391 if (scsi_get_prot_op(sc
) != SCSI_PROT_NORMAL
)
392 task
->protected = true;
394 transfer_length
= scsi_transfer_length(sc
);
395 hdr
->data_length
= cpu_to_be32(transfer_length
);
396 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
397 struct iscsi_r2t_info
*r2t
= &task
->unsol_r2t
;
399 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
403 * imm_count bytes to be sent right after
406 * unsol_count bytes(as Data-Out) to be sent
407 * without R2T ack right after
410 * r2t data_length bytes to be sent via R2T ack's
412 * pad_count bytes to be sent as zero-padding
414 memset(r2t
, 0, sizeof(*r2t
));
416 if (session
->imm_data_en
) {
417 if (transfer_length
>= session
->first_burst
)
418 task
->imm_count
= min(session
->first_burst
,
419 conn
->max_xmit_dlength
);
421 task
->imm_count
= min(transfer_length
,
422 conn
->max_xmit_dlength
);
423 hton24(hdr
->dlength
, task
->imm_count
);
425 zero_data(hdr
->dlength
);
427 if (!session
->initial_r2t_en
) {
428 r2t
->data_length
= min(session
->first_burst
,
431 r2t
->data_offset
= task
->imm_count
;
432 r2t
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
433 r2t
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
436 if (!task
->unsol_r2t
.data_length
)
437 /* No unsolicit Data-Out's */
438 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
440 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
441 zero_data(hdr
->dlength
);
443 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
444 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
447 /* calculate size of additional header segments (AHSs) */
448 hdrlength
= task
->hdr_len
- sizeof(*hdr
);
450 WARN_ON(hdrlength
& (ISCSI_PAD_LEN
-1));
451 hdrlength
/= ISCSI_PAD_LEN
;
453 WARN_ON(hdrlength
>= 256);
454 hdr
->hlength
= hdrlength
& 0xFF;
455 hdr
->cmdsn
= task
->cmdsn
= cpu_to_be32(session
->cmdsn
);
457 if (session
->tt
->init_task
&& session
->tt
->init_task(task
))
460 task
->state
= ISCSI_TASK_RUNNING
;
463 conn
->scsicmd_pdus_cnt
++;
464 ISCSI_DBG_SESSION(session
, "iscsi prep [%s cid %d sc %p cdb 0x%x "
465 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
466 scsi_bidi_cmnd(sc
) ? "bidirectional" :
467 sc
->sc_data_direction
== DMA_TO_DEVICE
?
468 "write" : "read", conn
->id
, sc
, sc
->cmnd
[0],
469 task
->itt
, transfer_length
,
470 scsi_bidi_cmnd(sc
) ? scsi_in(sc
)->length
: 0,
472 session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
477 * iscsi_free_task - free a task
478 * @task: iscsi cmd task
480 * Must be called with session back_lock.
481 * This function returns the scsi command to scsi-ml or cleans
482 * up mgmt tasks then returns the task to the pool.
484 static void iscsi_free_task(struct iscsi_task
*task
)
486 struct iscsi_conn
*conn
= task
->conn
;
487 struct iscsi_session
*session
= conn
->session
;
488 struct scsi_cmnd
*sc
= task
->sc
;
489 int oldstate
= task
->state
;
491 ISCSI_DBG_SESSION(session
, "freeing task itt 0x%x state %d sc %p\n",
492 task
->itt
, task
->state
, task
->sc
);
494 session
->tt
->cleanup_task(task
);
495 task
->state
= ISCSI_TASK_FREE
;
498 * login task is preallocated so do not free
500 if (conn
->login_task
== task
)
503 kfifo_in(&session
->cmdpool
.queue
, (void*)&task
, sizeof(void*));
506 /* SCSI eh reuses commands to verify us */
509 * queue command may call this to free the task, so
510 * it will decide how to return sc to scsi-ml.
512 if (oldstate
!= ISCSI_TASK_REQUEUE_SCSIQ
)
517 void __iscsi_get_task(struct iscsi_task
*task
)
519 atomic_inc(&task
->refcount
);
521 EXPORT_SYMBOL_GPL(__iscsi_get_task
);
523 void __iscsi_put_task(struct iscsi_task
*task
)
525 if (atomic_dec_and_test(&task
->refcount
))
526 iscsi_free_task(task
);
528 EXPORT_SYMBOL_GPL(__iscsi_put_task
);
530 void iscsi_put_task(struct iscsi_task
*task
)
532 struct iscsi_session
*session
= task
->conn
->session
;
534 /* regular RX path uses back_lock */
535 spin_lock_bh(&session
->back_lock
);
536 __iscsi_put_task(task
);
537 spin_unlock_bh(&session
->back_lock
);
539 EXPORT_SYMBOL_GPL(iscsi_put_task
);
542 * iscsi_complete_task - finish a task
543 * @task: iscsi cmd task
544 * @state: state to complete task with
546 * Must be called with session back_lock.
548 static void iscsi_complete_task(struct iscsi_task
*task
, int state
)
550 struct iscsi_conn
*conn
= task
->conn
;
552 ISCSI_DBG_SESSION(conn
->session
,
553 "complete task itt 0x%x state %d sc %p\n",
554 task
->itt
, task
->state
, task
->sc
);
555 if (task
->state
== ISCSI_TASK_COMPLETED
||
556 task
->state
== ISCSI_TASK_ABRT_TMF
||
557 task
->state
== ISCSI_TASK_ABRT_SESS_RECOV
||
558 task
->state
== ISCSI_TASK_REQUEUE_SCSIQ
)
560 WARN_ON_ONCE(task
->state
== ISCSI_TASK_FREE
);
563 if (!list_empty(&task
->running
))
564 list_del_init(&task
->running
);
566 if (conn
->task
== task
)
569 if (conn
->ping_task
== task
)
570 conn
->ping_task
= NULL
;
572 /* release get from queueing */
573 __iscsi_put_task(task
);
577 * iscsi_complete_scsi_task - finish scsi task normally
578 * @task: iscsi task for scsi cmd
579 * @exp_cmdsn: expected cmd sn in cpu format
580 * @max_cmdsn: max cmd sn in cpu format
582 * This is used when drivers do not need or cannot perform
583 * lower level pdu processing.
585 * Called with session back_lock
587 void iscsi_complete_scsi_task(struct iscsi_task
*task
,
588 uint32_t exp_cmdsn
, uint32_t max_cmdsn
)
590 struct iscsi_conn
*conn
= task
->conn
;
592 ISCSI_DBG_SESSION(conn
->session
, "[itt 0x%x]\n", task
->itt
);
594 conn
->last_recv
= jiffies
;
595 __iscsi_update_cmdsn(conn
->session
, exp_cmdsn
, max_cmdsn
);
596 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
598 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task
);
602 * session back_lock must be held and if not called for a task that is
603 * still pending or from the xmit thread, then xmit thread must
606 static void fail_scsi_task(struct iscsi_task
*task
, int err
)
608 struct iscsi_conn
*conn
= task
->conn
;
609 struct scsi_cmnd
*sc
;
613 * if a command completes and we get a successful tmf response
614 * we will hit this because the scsi eh abort code does not take
621 if (task
->state
== ISCSI_TASK_PENDING
) {
623 * cmd never made it to the xmit thread, so we should not count
624 * the cmd in the sequencing
626 conn
->session
->queued_cmdsn
--;
627 /* it was never sent so just complete like normal */
628 state
= ISCSI_TASK_COMPLETED
;
629 } else if (err
== DID_TRANSPORT_DISRUPTED
)
630 state
= ISCSI_TASK_ABRT_SESS_RECOV
;
632 state
= ISCSI_TASK_ABRT_TMF
;
634 sc
->result
= err
<< 16;
635 if (!scsi_bidi_cmnd(sc
))
636 scsi_set_resid(sc
, scsi_bufflen(sc
));
638 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
639 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
642 /* regular RX path uses back_lock */
643 spin_lock_bh(&conn
->session
->back_lock
);
644 iscsi_complete_task(task
, state
);
645 spin_unlock_bh(&conn
->session
->back_lock
);
648 static int iscsi_prep_mgmt_task(struct iscsi_conn
*conn
,
649 struct iscsi_task
*task
)
651 struct iscsi_session
*session
= conn
->session
;
652 struct iscsi_hdr
*hdr
= task
->hdr
;
653 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
654 uint8_t opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
;
656 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
659 if (opcode
!= ISCSI_OP_LOGIN
&& opcode
!= ISCSI_OP_TEXT
)
660 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
662 * pre-format CmdSN for outgoing PDU.
664 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
665 if (hdr
->itt
!= RESERVED_ITT
) {
667 * TODO: We always use immediate for normal session pdus.
668 * If we start to send tmfs or nops as non-immediate then
669 * we should start checking the cmdsn numbers for mgmt tasks.
671 * During discovery sessions iscsid sends TEXT as non immediate,
672 * but we always only send one PDU at a time.
674 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
675 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
676 session
->queued_cmdsn
++;
681 if (session
->tt
->init_task
&& session
->tt
->init_task(task
))
684 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
)
685 session
->state
= ISCSI_STATE_LOGGING_OUT
;
687 task
->state
= ISCSI_TASK_RUNNING
;
688 ISCSI_DBG_SESSION(session
, "mgmtpdu [op 0x%x hdr->itt 0x%x "
689 "datalen %d]\n", hdr
->opcode
& ISCSI_OPCODE_MASK
,
690 hdr
->itt
, task
->data_count
);
694 static struct iscsi_task
*
695 __iscsi_conn_send_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
696 char *data
, uint32_t data_size
)
698 struct iscsi_session
*session
= conn
->session
;
699 struct iscsi_host
*ihost
= shost_priv(session
->host
);
700 uint8_t opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
;
701 struct iscsi_task
*task
;
704 if (session
->state
== ISCSI_STATE_TERMINATE
)
707 if (opcode
== ISCSI_OP_LOGIN
|| opcode
== ISCSI_OP_TEXT
) {
709 * Login and Text are sent serially, in
710 * request-followed-by-response sequence.
711 * Same task can be used. Same ITT must be used.
712 * Note that login_task is preallocated at conn_create().
714 if (conn
->login_task
->state
!= ISCSI_TASK_FREE
) {
715 iscsi_conn_printk(KERN_ERR
, conn
, "Login/Text in "
716 "progress. Cannot start new task.\n");
720 task
= conn
->login_task
;
722 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
725 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
726 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
728 if (!kfifo_out(&session
->cmdpool
.queue
,
729 (void*)&task
, sizeof(void*)))
733 * released in complete pdu for task we expect a response for, and
734 * released by the lld when it has transmitted the task for
735 * pdus we do not expect a response for.
737 atomic_set(&task
->refcount
, 1);
740 INIT_LIST_HEAD(&task
->running
);
741 task
->state
= ISCSI_TASK_PENDING
;
744 memcpy(task
->data
, data
, data_size
);
745 task
->data_count
= data_size
;
747 task
->data_count
= 0;
749 if (conn
->session
->tt
->alloc_pdu
) {
750 if (conn
->session
->tt
->alloc_pdu(task
, hdr
->opcode
)) {
751 iscsi_conn_printk(KERN_ERR
, conn
, "Could not allocate "
752 "pdu for mgmt task.\n");
757 itt
= task
->hdr
->itt
;
758 task
->hdr_len
= sizeof(struct iscsi_hdr
);
759 memcpy(task
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
761 if (hdr
->itt
!= RESERVED_ITT
) {
762 if (session
->tt
->parse_pdu_itt
)
763 task
->hdr
->itt
= itt
;
765 task
->hdr
->itt
= build_itt(task
->itt
,
766 task
->conn
->session
->age
);
770 if (iscsi_prep_mgmt_task(conn
, task
))
773 if (session
->tt
->xmit_task(task
))
776 list_add_tail(&task
->running
, &conn
->mgmtqueue
);
777 iscsi_conn_queue_work(conn
);
783 /* regular RX path uses back_lock */
784 spin_lock_bh(&session
->back_lock
);
785 __iscsi_put_task(task
);
786 spin_unlock_bh(&session
->back_lock
);
790 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
791 char *data
, uint32_t data_size
)
793 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
794 struct iscsi_session
*session
= conn
->session
;
797 spin_lock_bh(&session
->frwd_lock
);
798 if (!__iscsi_conn_send_pdu(conn
, hdr
, data
, data_size
))
800 spin_unlock_bh(&session
->frwd_lock
);
803 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
806 * iscsi_cmd_rsp - SCSI Command Response processing
807 * @conn: iscsi connection
809 * @task: scsi command task
810 * @data: cmd data buffer
811 * @datalen: len of buffer
813 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
814 * then completes the command and task.
816 static void iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
817 struct iscsi_task
*task
, char *data
,
820 struct iscsi_scsi_rsp
*rhdr
= (struct iscsi_scsi_rsp
*)hdr
;
821 struct iscsi_session
*session
= conn
->session
;
822 struct scsi_cmnd
*sc
= task
->sc
;
824 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
825 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
827 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
829 if (task
->protected) {
834 * Transports that didn't implement check_protection
835 * callback but still published T10-PI support to scsi-mid
836 * deserve this BUG_ON.
838 BUG_ON(!session
->tt
->check_protection
);
840 ascq
= session
->tt
->check_protection(task
, §or
);
842 sc
->result
= DRIVER_SENSE
<< 24 |
843 SAM_STAT_CHECK_CONDITION
;
844 scsi_build_sense_buffer(1, sc
->sense_buffer
,
845 ILLEGAL_REQUEST
, 0x10, ascq
);
846 sc
->sense_buffer
[7] = 0xc; /* Additional sense length */
847 sc
->sense_buffer
[8] = 0; /* Information desc type */
848 sc
->sense_buffer
[9] = 0xa; /* Additional desc length */
849 sc
->sense_buffer
[10] = 0x80; /* Validity bit */
851 put_unaligned_be64(sector
, &sc
->sense_buffer
[12]);
856 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
857 sc
->result
= DID_ERROR
<< 16;
861 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
866 iscsi_conn_printk(KERN_ERR
, conn
,
867 "Got CHECK_CONDITION but invalid data "
868 "buffer size of %d\n", datalen
);
869 sc
->result
= DID_BAD_TARGET
<< 16;
873 senselen
= get_unaligned_be16(data
);
874 if (datalen
< senselen
)
875 goto invalid_datalen
;
877 memcpy(sc
->sense_buffer
, data
+ 2,
878 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
879 ISCSI_DBG_SESSION(session
, "copied %d bytes of sense\n",
880 min_t(uint16_t, senselen
,
881 SCSI_SENSE_BUFFERSIZE
));
884 if (rhdr
->flags
& (ISCSI_FLAG_CMD_BIDI_UNDERFLOW
|
885 ISCSI_FLAG_CMD_BIDI_OVERFLOW
)) {
886 int res_count
= be32_to_cpu(rhdr
->bi_residual_count
);
888 if (scsi_bidi_cmnd(sc
) && res_count
> 0 &&
889 (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_OVERFLOW
||
890 res_count
<= scsi_in(sc
)->length
))
891 scsi_in(sc
)->resid
= res_count
;
893 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
896 if (rhdr
->flags
& (ISCSI_FLAG_CMD_UNDERFLOW
|
897 ISCSI_FLAG_CMD_OVERFLOW
)) {
898 int res_count
= be32_to_cpu(rhdr
->residual_count
);
901 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
902 res_count
<= scsi_bufflen(sc
)))
903 /* write side for bidi or uni-io set_resid */
904 scsi_set_resid(sc
, res_count
);
906 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
909 ISCSI_DBG_SESSION(session
, "cmd rsp done [sc %p res %d itt 0x%x]\n",
910 sc
, sc
->result
, task
->itt
);
911 conn
->scsirsp_pdus_cnt
++;
912 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
916 * iscsi_data_in_rsp - SCSI Data-In Response processing
917 * @conn: iscsi connection
919 * @task: scsi command task
922 iscsi_data_in_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
923 struct iscsi_task
*task
)
925 struct iscsi_data_rsp
*rhdr
= (struct iscsi_data_rsp
*)hdr
;
926 struct scsi_cmnd
*sc
= task
->sc
;
928 if (!(rhdr
->flags
& ISCSI_FLAG_DATA_STATUS
))
931 iscsi_update_cmdsn(conn
->session
, (struct iscsi_nopin
*)hdr
);
932 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
933 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
934 if (rhdr
->flags
& (ISCSI_FLAG_DATA_UNDERFLOW
|
935 ISCSI_FLAG_DATA_OVERFLOW
)) {
936 int res_count
= be32_to_cpu(rhdr
->residual_count
);
939 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
940 res_count
<= scsi_in(sc
)->length
))
941 scsi_in(sc
)->resid
= res_count
;
943 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
946 ISCSI_DBG_SESSION(conn
->session
, "data in with status done "
947 "[sc %p res %d itt 0x%x]\n",
948 sc
, sc
->result
, task
->itt
);
949 conn
->scsirsp_pdus_cnt
++;
950 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
953 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
955 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
957 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
958 conn
->tmfrsp_pdus_cnt
++;
960 if (conn
->tmf_state
!= TMF_QUEUED
)
963 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
964 conn
->tmf_state
= TMF_SUCCESS
;
965 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
966 conn
->tmf_state
= TMF_NOT_FOUND
;
968 conn
->tmf_state
= TMF_FAILED
;
969 wake_up(&conn
->ehwait
);
972 static void iscsi_send_nopout(struct iscsi_conn
*conn
, struct iscsi_nopin
*rhdr
)
974 struct iscsi_nopout hdr
;
975 struct iscsi_task
*task
;
977 if (!rhdr
&& conn
->ping_task
)
980 memset(&hdr
, 0, sizeof(struct iscsi_nopout
));
981 hdr
.opcode
= ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
;
982 hdr
.flags
= ISCSI_FLAG_CMD_FINAL
;
987 hdr
.itt
= RESERVED_ITT
;
989 hdr
.ttt
= RESERVED_ITT
;
991 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)&hdr
, NULL
, 0);
993 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send nopout\n");
995 /* only track our nops */
996 conn
->ping_task
= task
;
997 conn
->last_ping
= jiffies
;
1001 static int iscsi_nop_out_rsp(struct iscsi_task
*task
,
1002 struct iscsi_nopin
*nop
, char *data
, int datalen
)
1004 struct iscsi_conn
*conn
= task
->conn
;
1007 if (conn
->ping_task
!= task
) {
1009 * If this is not in response to one of our
1010 * nops then it must be from userspace.
1012 if (iscsi_recv_pdu(conn
->cls_conn
, (struct iscsi_hdr
*)nop
,
1014 rc
= ISCSI_ERR_CONN_FAILED
;
1016 mod_timer(&conn
->transport_timer
, jiffies
+ conn
->recv_timeout
);
1017 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
1021 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
1022 char *data
, int datalen
)
1024 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
1025 struct iscsi_hdr rejected_pdu
;
1028 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
1030 if (ntoh24(reject
->dlength
) > datalen
||
1031 ntoh24(reject
->dlength
) < sizeof(struct iscsi_hdr
)) {
1032 iscsi_conn_printk(KERN_ERR
, conn
, "Cannot handle rejected "
1033 "pdu. Invalid data length (pdu dlength "
1034 "%u, datalen %d\n", ntoh24(reject
->dlength
),
1036 return ISCSI_ERR_PROTO
;
1038 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
1039 opcode
= rejected_pdu
.opcode
& ISCSI_OPCODE_MASK
;
1041 switch (reject
->reason
) {
1042 case ISCSI_REASON_DATA_DIGEST_ERROR
:
1043 iscsi_conn_printk(KERN_ERR
, conn
,
1044 "pdu (op 0x%x itt 0x%x) rejected "
1045 "due to DataDigest error.\n",
1046 opcode
, rejected_pdu
.itt
);
1048 case ISCSI_REASON_IMM_CMD_REJECT
:
1049 iscsi_conn_printk(KERN_ERR
, conn
,
1050 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1051 "immediate commands.\n",
1052 opcode
, rejected_pdu
.itt
);
1054 * We only send one TMF at a time so if the target could not
1055 * handle it, then it should get fixed (RFC mandates that
1056 * a target can handle one immediate TMF per conn).
1058 * For nops-outs, we could have sent more than one if
1059 * the target is sending us lots of nop-ins
1061 if (opcode
!= ISCSI_OP_NOOP_OUT
)
1064 if (rejected_pdu
.itt
== cpu_to_be32(ISCSI_RESERVED_TAG
)) {
1066 * nop-out in response to target's nop-out rejected.
1069 /* In RX path we are under back lock */
1070 spin_unlock(&conn
->session
->back_lock
);
1071 spin_lock(&conn
->session
->frwd_lock
);
1072 iscsi_send_nopout(conn
,
1073 (struct iscsi_nopin
*)&rejected_pdu
);
1074 spin_unlock(&conn
->session
->frwd_lock
);
1075 spin_lock(&conn
->session
->back_lock
);
1077 struct iscsi_task
*task
;
1079 * Our nop as ping got dropped. We know the target
1080 * and transport are ok so just clean up
1082 task
= iscsi_itt_to_task(conn
, rejected_pdu
.itt
);
1084 iscsi_conn_printk(KERN_ERR
, conn
,
1085 "Invalid pdu reject. Could "
1086 "not lookup rejected task.\n");
1087 rc
= ISCSI_ERR_BAD_ITT
;
1089 rc
= iscsi_nop_out_rsp(task
,
1090 (struct iscsi_nopin
*)&rejected_pdu
,
1095 iscsi_conn_printk(KERN_ERR
, conn
,
1096 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1097 "code 0x%x\n", rejected_pdu
.opcode
,
1098 rejected_pdu
.itt
, reject
->reason
);
1105 * iscsi_itt_to_task - look up task by itt
1106 * @conn: iscsi connection
1109 * This should be used for mgmt tasks like login and nops, or if
1110 * the LDD's itt space does not include the session age.
1112 * The session back_lock must be held.
1114 struct iscsi_task
*iscsi_itt_to_task(struct iscsi_conn
*conn
, itt_t itt
)
1116 struct iscsi_session
*session
= conn
->session
;
1119 if (itt
== RESERVED_ITT
)
1122 if (session
->tt
->parse_pdu_itt
)
1123 session
->tt
->parse_pdu_itt(conn
, itt
, &i
, NULL
);
1126 if (i
>= session
->cmds_max
)
1129 return session
->cmds
[i
];
1131 EXPORT_SYMBOL_GPL(iscsi_itt_to_task
);
1134 * __iscsi_complete_pdu - complete pdu
1136 * @hdr: iscsi header
1137 * @data: data buffer
1138 * @datalen: len of data buffer
1140 * Completes pdu processing by freeing any resources allocated at
1141 * queuecommand or send generic. session back_lock must be held and verify
1142 * itt must have been called.
1144 int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
1145 char *data
, int datalen
)
1147 struct iscsi_session
*session
= conn
->session
;
1148 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
1149 struct iscsi_task
*task
;
1152 conn
->last_recv
= jiffies
;
1153 rc
= iscsi_verify_itt(conn
, hdr
->itt
);
1157 if (hdr
->itt
!= RESERVED_ITT
)
1158 itt
= get_itt(hdr
->itt
);
1162 ISCSI_DBG_SESSION(session
, "[op 0x%x cid %d itt 0x%x len %d]\n",
1163 opcode
, conn
->id
, itt
, datalen
);
1166 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1169 case ISCSI_OP_NOOP_IN
:
1171 rc
= ISCSI_ERR_PROTO
;
1175 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
1178 /* In RX path we are under back lock */
1179 spin_unlock(&session
->back_lock
);
1180 spin_lock(&session
->frwd_lock
);
1181 iscsi_send_nopout(conn
, (struct iscsi_nopin
*)hdr
);
1182 spin_unlock(&session
->frwd_lock
);
1183 spin_lock(&session
->back_lock
);
1185 case ISCSI_OP_REJECT
:
1186 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
1188 case ISCSI_OP_ASYNC_EVENT
:
1189 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
1190 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
1191 rc
= ISCSI_ERR_CONN_FAILED
;
1194 rc
= ISCSI_ERR_BAD_OPCODE
;
1201 case ISCSI_OP_SCSI_CMD_RSP
:
1202 case ISCSI_OP_SCSI_DATA_IN
:
1203 task
= iscsi_itt_to_ctask(conn
, hdr
->itt
);
1205 return ISCSI_ERR_BAD_ITT
;
1206 task
->last_xfer
= jiffies
;
1210 * LLD handles R2Ts if they need to.
1213 case ISCSI_OP_LOGOUT_RSP
:
1214 case ISCSI_OP_LOGIN_RSP
:
1215 case ISCSI_OP_TEXT_RSP
:
1216 case ISCSI_OP_SCSI_TMFUNC_RSP
:
1217 case ISCSI_OP_NOOP_IN
:
1218 task
= iscsi_itt_to_task(conn
, hdr
->itt
);
1220 return ISCSI_ERR_BAD_ITT
;
1223 return ISCSI_ERR_BAD_OPCODE
;
1227 case ISCSI_OP_SCSI_CMD_RSP
:
1228 iscsi_scsi_cmd_rsp(conn
, hdr
, task
, data
, datalen
);
1230 case ISCSI_OP_SCSI_DATA_IN
:
1231 iscsi_data_in_rsp(conn
, hdr
, task
);
1233 case ISCSI_OP_LOGOUT_RSP
:
1234 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1236 rc
= ISCSI_ERR_PROTO
;
1239 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
1241 case ISCSI_OP_LOGIN_RSP
:
1242 case ISCSI_OP_TEXT_RSP
:
1243 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1245 * login related PDU's exp_statsn is handled in
1249 case ISCSI_OP_SCSI_TMFUNC_RSP
:
1250 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1252 rc
= ISCSI_ERR_PROTO
;
1256 iscsi_tmf_rsp(conn
, hdr
);
1257 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
1259 case ISCSI_OP_NOOP_IN
:
1260 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1261 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) || datalen
) {
1262 rc
= ISCSI_ERR_PROTO
;
1265 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
1267 rc
= iscsi_nop_out_rsp(task
, (struct iscsi_nopin
*)hdr
,
1271 rc
= ISCSI_ERR_BAD_OPCODE
;
1278 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
1279 rc
= ISCSI_ERR_CONN_FAILED
;
1280 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
1283 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu
);
1285 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
1286 char *data
, int datalen
)
1290 spin_lock(&conn
->session
->back_lock
);
1291 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
1292 spin_unlock(&conn
->session
->back_lock
);
1295 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
1297 int iscsi_verify_itt(struct iscsi_conn
*conn
, itt_t itt
)
1299 struct iscsi_session
*session
= conn
->session
;
1302 if (itt
== RESERVED_ITT
)
1305 if (session
->tt
->parse_pdu_itt
)
1306 session
->tt
->parse_pdu_itt(conn
, itt
, &i
, &age
);
1309 age
= ((__force u32
)itt
>> ISCSI_AGE_SHIFT
) & ISCSI_AGE_MASK
;
1312 if (age
!= session
->age
) {
1313 iscsi_conn_printk(KERN_ERR
, conn
,
1314 "received itt %x expected session age (%x)\n",
1315 (__force u32
)itt
, session
->age
);
1316 return ISCSI_ERR_BAD_ITT
;
1319 if (i
>= session
->cmds_max
) {
1320 iscsi_conn_printk(KERN_ERR
, conn
,
1321 "received invalid itt index %u (max cmds "
1322 "%u.\n", i
, session
->cmds_max
);
1323 return ISCSI_ERR_BAD_ITT
;
1327 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
1330 * iscsi_itt_to_ctask - look up ctask by itt
1331 * @conn: iscsi connection
1334 * This should be used for cmd tasks.
1336 * The session back_lock must be held.
1338 struct iscsi_task
*iscsi_itt_to_ctask(struct iscsi_conn
*conn
, itt_t itt
)
1340 struct iscsi_task
*task
;
1342 if (iscsi_verify_itt(conn
, itt
))
1345 task
= iscsi_itt_to_task(conn
, itt
);
1346 if (!task
|| !task
->sc
)
1349 if (task
->sc
->SCp
.phase
!= conn
->session
->age
) {
1350 iscsi_session_printk(KERN_ERR
, conn
->session
,
1351 "task's session age %d, expected %d\n",
1352 task
->sc
->SCp
.phase
, conn
->session
->age
);
1358 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask
);
1360 void iscsi_session_failure(struct iscsi_session
*session
,
1363 struct iscsi_conn
*conn
;
1366 spin_lock_bh(&session
->frwd_lock
);
1367 conn
= session
->leadconn
;
1368 if (session
->state
== ISCSI_STATE_TERMINATE
|| !conn
) {
1369 spin_unlock_bh(&session
->frwd_lock
);
1373 dev
= get_device(&conn
->cls_conn
->dev
);
1374 spin_unlock_bh(&session
->frwd_lock
);
1378 * if the host is being removed bypass the connection
1379 * recovery initialization because we are going to kill
1382 if (err
== ISCSI_ERR_INVALID_HOST
)
1383 iscsi_conn_error_event(conn
->cls_conn
, err
);
1385 iscsi_conn_failure(conn
, err
);
1388 EXPORT_SYMBOL_GPL(iscsi_session_failure
);
1390 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
1392 struct iscsi_session
*session
= conn
->session
;
1394 spin_lock_bh(&session
->frwd_lock
);
1395 if (session
->state
== ISCSI_STATE_FAILED
) {
1396 spin_unlock_bh(&session
->frwd_lock
);
1400 if (conn
->stop_stage
== 0)
1401 session
->state
= ISCSI_STATE_FAILED
;
1402 spin_unlock_bh(&session
->frwd_lock
);
1404 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1405 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1406 iscsi_conn_error_event(conn
->cls_conn
, err
);
1408 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
1410 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn
*conn
)
1412 struct iscsi_session
*session
= conn
->session
;
1415 * Check for iSCSI window and take care of CmdSN wrap-around
1417 if (!iscsi_sna_lte(session
->queued_cmdsn
, session
->max_cmdsn
)) {
1418 ISCSI_DBG_SESSION(session
, "iSCSI CmdSN closed. ExpCmdSn "
1419 "%u MaxCmdSN %u CmdSN %u/%u\n",
1420 session
->exp_cmdsn
, session
->max_cmdsn
,
1421 session
->cmdsn
, session
->queued_cmdsn
);
1427 static int iscsi_xmit_task(struct iscsi_conn
*conn
)
1429 struct iscsi_task
*task
= conn
->task
;
1432 if (test_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
))
1435 __iscsi_get_task(task
);
1436 spin_unlock_bh(&conn
->session
->frwd_lock
);
1437 rc
= conn
->session
->tt
->xmit_task(task
);
1438 spin_lock_bh(&conn
->session
->frwd_lock
);
1440 /* done with this task */
1441 task
->last_xfer
= jiffies
;
1444 /* regular RX path uses back_lock */
1445 spin_lock(&conn
->session
->back_lock
);
1446 __iscsi_put_task(task
);
1447 spin_unlock(&conn
->session
->back_lock
);
1452 * iscsi_requeue_task - requeue task to run from session workqueue
1453 * @task: task to requeue
1455 * LLDs that need to run a task from the session workqueue should call
1456 * this. The session frwd_lock must be held. This should only be called
1457 * by software drivers.
1459 void iscsi_requeue_task(struct iscsi_task
*task
)
1461 struct iscsi_conn
*conn
= task
->conn
;
1464 * this may be on the requeue list already if the xmit_task callout
1465 * is handling the r2ts while we are adding new ones
1467 if (list_empty(&task
->running
))
1468 list_add_tail(&task
->running
, &conn
->requeue
);
1469 iscsi_conn_queue_work(conn
);
1471 EXPORT_SYMBOL_GPL(iscsi_requeue_task
);
1474 * iscsi_data_xmit - xmit any command into the scheduled connection
1475 * @conn: iscsi connection
1478 * The function can return -EAGAIN in which case the caller must
1479 * re-schedule it again later or recover. '0' return code means
1482 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
1484 struct iscsi_task
*task
;
1487 spin_lock_bh(&conn
->session
->frwd_lock
);
1488 if (test_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
)) {
1489 ISCSI_DBG_SESSION(conn
->session
, "Tx suspended!\n");
1490 spin_unlock_bh(&conn
->session
->frwd_lock
);
1495 rc
= iscsi_xmit_task(conn
);
1501 * process mgmt pdus like nops before commands since we should
1502 * only have one nop-out as a ping from us and targets should not
1503 * overflow us with nop-ins
1506 while (!list_empty(&conn
->mgmtqueue
)) {
1507 conn
->task
= list_entry(conn
->mgmtqueue
.next
,
1508 struct iscsi_task
, running
);
1509 list_del_init(&conn
->task
->running
);
1510 if (iscsi_prep_mgmt_task(conn
, conn
->task
)) {
1511 /* regular RX path uses back_lock */
1512 spin_lock_bh(&conn
->session
->back_lock
);
1513 __iscsi_put_task(conn
->task
);
1514 spin_unlock_bh(&conn
->session
->back_lock
);
1518 rc
= iscsi_xmit_task(conn
);
1523 /* process pending command queue */
1524 while (!list_empty(&conn
->cmdqueue
)) {
1525 conn
->task
= list_entry(conn
->cmdqueue
.next
, struct iscsi_task
,
1527 list_del_init(&conn
->task
->running
);
1528 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
1529 fail_scsi_task(conn
->task
, DID_IMM_RETRY
);
1532 rc
= iscsi_prep_scsi_cmd_pdu(conn
->task
);
1534 if (rc
== -ENOMEM
|| rc
== -EACCES
) {
1535 list_add_tail(&conn
->task
->running
,
1540 fail_scsi_task(conn
->task
, DID_ABORT
);
1543 rc
= iscsi_xmit_task(conn
);
1547 * we could continuously get new task requests so
1548 * we need to check the mgmt queue for nops that need to
1549 * be sent to aviod starvation
1551 if (!list_empty(&conn
->mgmtqueue
))
1555 while (!list_empty(&conn
->requeue
)) {
1557 * we always do fastlogout - conn stop code will clean up.
1559 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
1562 task
= list_entry(conn
->requeue
.next
, struct iscsi_task
,
1564 if (iscsi_check_tmf_restrictions(task
, ISCSI_OP_SCSI_DATA_OUT
))
1568 list_del_init(&conn
->task
->running
);
1569 conn
->task
->state
= ISCSI_TASK_RUNNING
;
1570 rc
= iscsi_xmit_task(conn
);
1573 if (!list_empty(&conn
->mgmtqueue
))
1576 spin_unlock_bh(&conn
->session
->frwd_lock
);
1580 spin_unlock_bh(&conn
->session
->frwd_lock
);
1584 static void iscsi_xmitworker(struct work_struct
*work
)
1586 struct iscsi_conn
*conn
=
1587 container_of(work
, struct iscsi_conn
, xmitwork
);
1590 * serialize Xmit worker on a per-connection basis.
1593 rc
= iscsi_data_xmit(conn
);
1594 } while (rc
>= 0 || rc
== -EAGAIN
);
1597 static inline struct iscsi_task
*iscsi_alloc_task(struct iscsi_conn
*conn
,
1598 struct scsi_cmnd
*sc
)
1600 struct iscsi_task
*task
;
1602 if (!kfifo_out(&conn
->session
->cmdpool
.queue
,
1603 (void *) &task
, sizeof(void *)))
1606 sc
->SCp
.phase
= conn
->session
->age
;
1607 sc
->SCp
.ptr
= (char *) task
;
1609 atomic_set(&task
->refcount
, 1);
1610 task
->state
= ISCSI_TASK_PENDING
;
1613 task
->have_checked_conn
= false;
1614 task
->last_timeout
= jiffies
;
1615 task
->last_xfer
= jiffies
;
1616 task
->protected = false;
1617 INIT_LIST_HEAD(&task
->running
);
1622 FAILURE_BAD_HOST
= 1,
1623 FAILURE_SESSION_FAILED
,
1624 FAILURE_SESSION_FREED
,
1625 FAILURE_WINDOW_CLOSED
,
1627 FAILURE_SESSION_TERMINATE
,
1628 FAILURE_SESSION_IN_RECOVERY
,
1629 FAILURE_SESSION_RECOVERY_TIMEOUT
,
1630 FAILURE_SESSION_LOGGING_OUT
,
1631 FAILURE_SESSION_NOT_READY
,
1634 int iscsi_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*sc
)
1636 struct iscsi_cls_session
*cls_session
;
1637 struct iscsi_host
*ihost
;
1639 struct iscsi_session
*session
;
1640 struct iscsi_conn
*conn
;
1641 struct iscsi_task
*task
= NULL
;
1646 ihost
= shost_priv(host
);
1648 cls_session
= starget_to_session(scsi_target(sc
->device
));
1649 session
= cls_session
->dd_data
;
1650 spin_lock_bh(&session
->frwd_lock
);
1652 reason
= iscsi_session_chkready(cls_session
);
1654 sc
->result
= reason
;
1658 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1660 * to handle the race between when we set the recovery state
1661 * and block the session we requeue here (commands could
1662 * be entering our queuecommand while a block is starting
1663 * up because the block code is not locked)
1665 switch (session
->state
) {
1666 case ISCSI_STATE_FAILED
:
1667 case ISCSI_STATE_IN_RECOVERY
:
1668 reason
= FAILURE_SESSION_IN_RECOVERY
;
1669 sc
->result
= DID_IMM_RETRY
<< 16;
1671 case ISCSI_STATE_LOGGING_OUT
:
1672 reason
= FAILURE_SESSION_LOGGING_OUT
;
1673 sc
->result
= DID_IMM_RETRY
<< 16;
1675 case ISCSI_STATE_RECOVERY_FAILED
:
1676 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
1677 sc
->result
= DID_TRANSPORT_FAILFAST
<< 16;
1679 case ISCSI_STATE_TERMINATE
:
1680 reason
= FAILURE_SESSION_TERMINATE
;
1681 sc
->result
= DID_NO_CONNECT
<< 16;
1684 reason
= FAILURE_SESSION_FREED
;
1685 sc
->result
= DID_NO_CONNECT
<< 16;
1690 conn
= session
->leadconn
;
1692 reason
= FAILURE_SESSION_FREED
;
1693 sc
->result
= DID_NO_CONNECT
<< 16;
1697 if (test_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
)) {
1698 reason
= FAILURE_SESSION_IN_RECOVERY
;
1699 sc
->result
= DID_REQUEUE
;
1703 if (iscsi_check_cmdsn_window_closed(conn
)) {
1704 reason
= FAILURE_WINDOW_CLOSED
;
1708 task
= iscsi_alloc_task(conn
, sc
);
1710 reason
= FAILURE_OOM
;
1714 if (!ihost
->workq
) {
1715 reason
= iscsi_prep_scsi_cmd_pdu(task
);
1717 if (reason
== -ENOMEM
|| reason
== -EACCES
) {
1718 reason
= FAILURE_OOM
;
1721 sc
->result
= DID_ABORT
<< 16;
1725 if (session
->tt
->xmit_task(task
)) {
1727 reason
= FAILURE_SESSION_NOT_READY
;
1731 list_add_tail(&task
->running
, &conn
->cmdqueue
);
1732 iscsi_conn_queue_work(conn
);
1735 session
->queued_cmdsn
++;
1736 spin_unlock_bh(&session
->frwd_lock
);
1740 iscsi_complete_task(task
, ISCSI_TASK_REQUEUE_SCSIQ
);
1742 spin_unlock_bh(&session
->frwd_lock
);
1743 ISCSI_DBG_SESSION(session
, "cmd 0x%x rejected (%d)\n",
1744 sc
->cmnd
[0], reason
);
1745 return SCSI_MLQUEUE_TARGET_BUSY
;
1748 iscsi_complete_task(task
, ISCSI_TASK_REQUEUE_SCSIQ
);
1750 spin_unlock_bh(&session
->frwd_lock
);
1751 ISCSI_DBG_SESSION(session
, "iscsi: cmd 0x%x is not queued (%d)\n",
1752 sc
->cmnd
[0], reason
);
1753 if (!scsi_bidi_cmnd(sc
))
1754 scsi_set_resid(sc
, scsi_bufflen(sc
));
1756 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
1757 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
1762 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
1764 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
, int reason
)
1767 case SCSI_QDEPTH_DEFAULT
:
1768 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
1770 case SCSI_QDEPTH_QFULL
:
1771 scsi_track_queue_full(sdev
, depth
);
1773 case SCSI_QDEPTH_RAMP_UP
:
1774 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
1779 return sdev
->queue_depth
;
1781 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
1783 int iscsi_target_alloc(struct scsi_target
*starget
)
1785 struct iscsi_cls_session
*cls_session
= starget_to_session(starget
);
1786 struct iscsi_session
*session
= cls_session
->dd_data
;
1788 starget
->can_queue
= session
->scsi_cmds_max
;
1791 EXPORT_SYMBOL_GPL(iscsi_target_alloc
);
1793 static void iscsi_tmf_timedout(unsigned long data
)
1795 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
1796 struct iscsi_session
*session
= conn
->session
;
1798 spin_lock(&session
->frwd_lock
);
1799 if (conn
->tmf_state
== TMF_QUEUED
) {
1800 conn
->tmf_state
= TMF_TIMEDOUT
;
1801 ISCSI_DBG_EH(session
, "tmf timedout\n");
1802 /* unblock eh_abort() */
1803 wake_up(&conn
->ehwait
);
1805 spin_unlock(&session
->frwd_lock
);
1808 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn
*conn
,
1809 struct iscsi_tm
*hdr
, int age
,
1812 struct iscsi_session
*session
= conn
->session
;
1813 struct iscsi_task
*task
;
1815 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)hdr
,
1818 spin_unlock_bh(&session
->frwd_lock
);
1819 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send TMF.\n");
1820 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1821 spin_lock_bh(&session
->frwd_lock
);
1824 conn
->tmfcmd_pdus_cnt
++;
1825 conn
->tmf_timer
.expires
= timeout
* HZ
+ jiffies
;
1826 conn
->tmf_timer
.function
= iscsi_tmf_timedout
;
1827 conn
->tmf_timer
.data
= (unsigned long)conn
;
1828 add_timer(&conn
->tmf_timer
);
1829 ISCSI_DBG_EH(session
, "tmf set timeout\n");
1831 spin_unlock_bh(&session
->frwd_lock
);
1832 mutex_unlock(&session
->eh_mutex
);
1835 * block eh thread until:
1839 * 3) session is terminated or restarted or userspace has
1840 * given up on recovery
1842 wait_event_interruptible(conn
->ehwait
, age
!= session
->age
||
1843 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1844 conn
->tmf_state
!= TMF_QUEUED
);
1845 if (signal_pending(current
))
1846 flush_signals(current
);
1847 del_timer_sync(&conn
->tmf_timer
);
1849 mutex_lock(&session
->eh_mutex
);
1850 spin_lock_bh(&session
->frwd_lock
);
1851 /* if the session drops it will clean up the task */
1852 if (age
!= session
->age
||
1853 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1859 * Fail commands. session lock held and recv side suspended and xmit
1862 static void fail_scsi_tasks(struct iscsi_conn
*conn
, u64 lun
, int error
)
1864 struct iscsi_task
*task
;
1867 for (i
= 0; i
< conn
->session
->cmds_max
; i
++) {
1868 task
= conn
->session
->cmds
[i
];
1869 if (!task
->sc
|| task
->state
== ISCSI_TASK_FREE
)
1872 if (lun
!= -1 && lun
!= task
->sc
->device
->lun
)
1875 ISCSI_DBG_SESSION(conn
->session
,
1876 "failing sc %p itt 0x%x state %d\n",
1877 task
->sc
, task
->itt
, task
->state
);
1878 fail_scsi_task(task
, error
);
1883 * iscsi_suspend_queue - suspend iscsi_queuecommand
1884 * @conn: iscsi conn to stop queueing IO on
1886 * This grabs the session frwd_lock to make sure no one is in
1887 * xmit_task/queuecommand, and then sets suspend to prevent
1888 * new commands from being queued. This only needs to be called
1889 * by offload drivers that need to sync a path like ep disconnect
1890 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1891 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1893 void iscsi_suspend_queue(struct iscsi_conn
*conn
)
1895 spin_lock_bh(&conn
->session
->frwd_lock
);
1896 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1897 spin_unlock_bh(&conn
->session
->frwd_lock
);
1899 EXPORT_SYMBOL_GPL(iscsi_suspend_queue
);
1902 * iscsi_suspend_tx - suspend iscsi_data_xmit
1903 * @conn: iscsi conn tp stop processing IO on.
1905 * This function sets the suspend bit to prevent iscsi_data_xmit
1906 * from sending new IO, and if work is queued on the xmit thread
1907 * it will wait for it to be completed.
1909 void iscsi_suspend_tx(struct iscsi_conn
*conn
)
1911 struct Scsi_Host
*shost
= conn
->session
->host
;
1912 struct iscsi_host
*ihost
= shost_priv(shost
);
1914 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1916 flush_workqueue(ihost
->workq
);
1918 EXPORT_SYMBOL_GPL(iscsi_suspend_tx
);
1920 static void iscsi_start_tx(struct iscsi_conn
*conn
)
1922 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1923 iscsi_conn_queue_work(conn
);
1927 * We want to make sure a ping is in flight. It has timed out.
1928 * And we are not busy processing a pdu that is making
1929 * progress but got started before the ping and is taking a while
1930 * to complete so the ping is just stuck behind it in a queue.
1932 static int iscsi_has_ping_timed_out(struct iscsi_conn
*conn
)
1934 if (conn
->ping_task
&&
1935 time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
) +
1936 (conn
->ping_timeout
* HZ
), jiffies
))
1942 static enum blk_eh_timer_return
iscsi_eh_cmd_timed_out(struct scsi_cmnd
*sc
)
1944 enum blk_eh_timer_return rc
= BLK_EH_NOT_HANDLED
;
1945 struct iscsi_task
*task
= NULL
, *running_task
;
1946 struct iscsi_cls_session
*cls_session
;
1947 struct iscsi_session
*session
;
1948 struct iscsi_conn
*conn
;
1951 cls_session
= starget_to_session(scsi_target(sc
->device
));
1952 session
= cls_session
->dd_data
;
1954 ISCSI_DBG_EH(session
, "scsi cmd %p timedout\n", sc
);
1956 spin_lock(&session
->frwd_lock
);
1957 task
= (struct iscsi_task
*)sc
->SCp
.ptr
;
1960 * Raced with completion. Blk layer has taken ownership
1961 * so let timeout code complete it now.
1963 rc
= BLK_EH_HANDLED
;
1967 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1969 * We are probably in the middle of iscsi recovery so let
1970 * that complete and handle the error.
1972 rc
= BLK_EH_RESET_TIMER
;
1976 conn
= session
->leadconn
;
1978 /* In the middle of shuting down */
1979 rc
= BLK_EH_RESET_TIMER
;
1984 * If we have sent (at least queued to the network layer) a pdu or
1985 * recvd one for the task since the last timeout ask for
1986 * more time. If on the next timeout we have not made progress
1987 * we can check if it is the task or connection when we send the
1990 if (time_after(task
->last_xfer
, task
->last_timeout
)) {
1991 ISCSI_DBG_EH(session
, "Command making progress. Asking "
1992 "scsi-ml for more time to complete. "
1993 "Last data xfer at %lu. Last timeout was at "
1994 "%lu\n.", task
->last_xfer
, task
->last_timeout
);
1995 task
->have_checked_conn
= false;
1996 rc
= BLK_EH_RESET_TIMER
;
2000 if (!conn
->recv_timeout
&& !conn
->ping_timeout
)
2003 * if the ping timedout then we are in the middle of cleaning up
2004 * and can let the iscsi eh handle it
2006 if (iscsi_has_ping_timed_out(conn
)) {
2007 rc
= BLK_EH_RESET_TIMER
;
2011 for (i
= 0; i
< conn
->session
->cmds_max
; i
++) {
2012 running_task
= conn
->session
->cmds
[i
];
2013 if (!running_task
->sc
|| running_task
== task
||
2014 running_task
->state
!= ISCSI_TASK_RUNNING
)
2018 * Only check if cmds started before this one have made
2019 * progress, or this could never fail
2021 if (time_after(running_task
->sc
->jiffies_at_alloc
,
2022 task
->sc
->jiffies_at_alloc
))
2025 if (time_after(running_task
->last_xfer
, task
->last_timeout
)) {
2027 * This task has not made progress, but a task
2028 * started before us has transferred data since
2029 * we started/last-checked. We could be queueing
2030 * too many tasks or the LU is bad.
2032 * If the device is bad the cmds ahead of us on
2033 * other devs will complete, and this loop will
2034 * eventually fail starting the scsi eh.
2036 ISCSI_DBG_EH(session
, "Command has not made progress "
2037 "but commands ahead of it have. "
2038 "Asking scsi-ml for more time to "
2039 "complete. Our last xfer vs running task "
2040 "last xfer %lu/%lu. Last check %lu.\n",
2041 task
->last_xfer
, running_task
->last_xfer
,
2042 task
->last_timeout
);
2043 rc
= BLK_EH_RESET_TIMER
;
2048 /* Assumes nop timeout is shorter than scsi cmd timeout */
2049 if (task
->have_checked_conn
)
2053 * Checking the transport already or nop from a cmd timeout still
2056 if (conn
->ping_task
) {
2057 task
->have_checked_conn
= true;
2058 rc
= BLK_EH_RESET_TIMER
;
2062 /* Make sure there is a transport check done */
2063 iscsi_send_nopout(conn
, NULL
);
2064 task
->have_checked_conn
= true;
2065 rc
= BLK_EH_RESET_TIMER
;
2069 task
->last_timeout
= jiffies
;
2070 spin_unlock(&session
->frwd_lock
);
2071 ISCSI_DBG_EH(session
, "return %s\n", rc
== BLK_EH_RESET_TIMER
?
2072 "timer reset" : "nh");
2076 static void iscsi_check_transport_timeouts(unsigned long data
)
2078 struct iscsi_conn
*conn
= (struct iscsi_conn
*)data
;
2079 struct iscsi_session
*session
= conn
->session
;
2080 unsigned long recv_timeout
, next_timeout
= 0, last_recv
;
2082 spin_lock(&session
->frwd_lock
);
2083 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
2086 recv_timeout
= conn
->recv_timeout
;
2091 last_recv
= conn
->last_recv
;
2093 if (iscsi_has_ping_timed_out(conn
)) {
2094 iscsi_conn_printk(KERN_ERR
, conn
, "ping timeout of %d secs "
2095 "expired, recv timeout %d, last rx %lu, "
2096 "last ping %lu, now %lu\n",
2097 conn
->ping_timeout
, conn
->recv_timeout
,
2098 last_recv
, conn
->last_ping
, jiffies
);
2099 spin_unlock(&session
->frwd_lock
);
2100 iscsi_conn_failure(conn
, ISCSI_ERR_NOP_TIMEDOUT
);
2104 if (time_before_eq(last_recv
+ recv_timeout
, jiffies
)) {
2105 /* send a ping to try to provoke some traffic */
2106 ISCSI_DBG_CONN(conn
, "Sending nopout as ping\n");
2107 iscsi_send_nopout(conn
, NULL
);
2108 next_timeout
= conn
->last_ping
+ (conn
->ping_timeout
* HZ
);
2110 next_timeout
= last_recv
+ recv_timeout
;
2112 ISCSI_DBG_CONN(conn
, "Setting next tmo %lu\n", next_timeout
);
2113 mod_timer(&conn
->transport_timer
, next_timeout
);
2115 spin_unlock(&session
->frwd_lock
);
2118 static void iscsi_prep_abort_task_pdu(struct iscsi_task
*task
,
2119 struct iscsi_tm
*hdr
)
2121 memset(hdr
, 0, sizeof(*hdr
));
2122 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
2123 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
& ISCSI_FLAG_TM_FUNC_MASK
;
2124 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2125 hdr
->lun
= task
->lun
;
2126 hdr
->rtt
= task
->hdr_itt
;
2127 hdr
->refcmdsn
= task
->cmdsn
;
2130 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
2132 struct iscsi_cls_session
*cls_session
;
2133 struct iscsi_session
*session
;
2134 struct iscsi_conn
*conn
;
2135 struct iscsi_task
*task
;
2136 struct iscsi_tm
*hdr
;
2139 cls_session
= starget_to_session(scsi_target(sc
->device
));
2140 session
= cls_session
->dd_data
;
2142 ISCSI_DBG_EH(session
, "aborting sc %p\n", sc
);
2144 mutex_lock(&session
->eh_mutex
);
2145 spin_lock_bh(&session
->frwd_lock
);
2147 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2151 ISCSI_DBG_EH(session
, "sc never reached iscsi layer or "
2153 spin_unlock_bh(&session
->frwd_lock
);
2154 mutex_unlock(&session
->eh_mutex
);
2159 * If we are not logged in or we have started a new session
2160 * then let the host reset code handle this
2162 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
||
2163 sc
->SCp
.phase
!= session
->age
) {
2164 spin_unlock_bh(&session
->frwd_lock
);
2165 mutex_unlock(&session
->eh_mutex
);
2166 ISCSI_DBG_EH(session
, "failing abort due to dropped "
2171 conn
= session
->leadconn
;
2172 conn
->eh_abort_cnt
++;
2175 task
= (struct iscsi_task
*)sc
->SCp
.ptr
;
2176 ISCSI_DBG_EH(session
, "aborting [sc %p itt 0x%x]\n",
2179 /* task completed before time out */
2181 ISCSI_DBG_EH(session
, "sc completed while abort in progress\n");
2185 if (task
->state
== ISCSI_TASK_PENDING
) {
2186 fail_scsi_task(task
, DID_ABORT
);
2190 /* only have one tmf outstanding at a time */
2191 if (conn
->tmf_state
!= TMF_INITIAL
)
2193 conn
->tmf_state
= TMF_QUEUED
;
2196 iscsi_prep_abort_task_pdu(task
, hdr
);
2198 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, age
, session
->abort_timeout
)) {
2203 switch (conn
->tmf_state
) {
2205 spin_unlock_bh(&session
->frwd_lock
);
2207 * stop tx side incase the target had sent a abort rsp but
2208 * the initiator was still writing out data.
2210 iscsi_suspend_tx(conn
);
2212 * we do not stop the recv side because targets have been
2213 * good and have never sent us a successful tmf response
2214 * then sent more data for the cmd.
2216 spin_lock_bh(&session
->frwd_lock
);
2217 fail_scsi_task(task
, DID_ABORT
);
2218 conn
->tmf_state
= TMF_INITIAL
;
2219 memset(hdr
, 0, sizeof(*hdr
));
2220 spin_unlock_bh(&session
->frwd_lock
);
2221 iscsi_start_tx(conn
);
2222 goto success_unlocked
;
2224 spin_unlock_bh(&session
->frwd_lock
);
2225 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2226 goto failed_unlocked
;
2229 conn
->tmf_state
= TMF_INITIAL
;
2230 memset(hdr
, 0, sizeof(*hdr
));
2231 /* task completed before tmf abort response */
2232 ISCSI_DBG_EH(session
, "sc completed while abort in "
2238 conn
->tmf_state
= TMF_INITIAL
;
2243 spin_unlock_bh(&session
->frwd_lock
);
2245 ISCSI_DBG_EH(session
, "abort success [sc %p itt 0x%x]\n",
2247 mutex_unlock(&session
->eh_mutex
);
2251 spin_unlock_bh(&session
->frwd_lock
);
2253 ISCSI_DBG_EH(session
, "abort failed [sc %p itt 0x%x]\n", sc
,
2254 task
? task
->itt
: 0);
2255 mutex_unlock(&session
->eh_mutex
);
2258 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
2260 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
2262 memset(hdr
, 0, sizeof(*hdr
));
2263 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
2264 hdr
->flags
= ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
2265 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2266 int_to_scsilun(sc
->device
->lun
, &hdr
->lun
);
2267 hdr
->rtt
= RESERVED_ITT
;
2270 int iscsi_eh_device_reset(struct scsi_cmnd
*sc
)
2272 struct iscsi_cls_session
*cls_session
;
2273 struct iscsi_session
*session
;
2274 struct iscsi_conn
*conn
;
2275 struct iscsi_tm
*hdr
;
2278 cls_session
= starget_to_session(scsi_target(sc
->device
));
2279 session
= cls_session
->dd_data
;
2281 ISCSI_DBG_EH(session
, "LU Reset [sc %p lun %llu]\n", sc
,
2284 mutex_lock(&session
->eh_mutex
);
2285 spin_lock_bh(&session
->frwd_lock
);
2287 * Just check if we are not logged in. We cannot check for
2288 * the phase because the reset could come from a ioctl.
2290 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
2292 conn
= session
->leadconn
;
2294 /* only have one tmf outstanding at a time */
2295 if (conn
->tmf_state
!= TMF_INITIAL
)
2297 conn
->tmf_state
= TMF_QUEUED
;
2300 iscsi_prep_lun_reset_pdu(sc
, hdr
);
2302 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
2303 session
->lu_reset_timeout
)) {
2308 switch (conn
->tmf_state
) {
2312 spin_unlock_bh(&session
->frwd_lock
);
2313 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2316 conn
->tmf_state
= TMF_INITIAL
;
2321 spin_unlock_bh(&session
->frwd_lock
);
2323 iscsi_suspend_tx(conn
);
2325 spin_lock_bh(&session
->frwd_lock
);
2326 memset(hdr
, 0, sizeof(*hdr
));
2327 fail_scsi_tasks(conn
, sc
->device
->lun
, DID_ERROR
);
2328 conn
->tmf_state
= TMF_INITIAL
;
2329 spin_unlock_bh(&session
->frwd_lock
);
2331 iscsi_start_tx(conn
);
2335 spin_unlock_bh(&session
->frwd_lock
);
2337 ISCSI_DBG_EH(session
, "dev reset result = %s\n",
2338 rc
== SUCCESS
? "SUCCESS" : "FAILED");
2339 mutex_unlock(&session
->eh_mutex
);
2342 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset
);
2344 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
2346 struct iscsi_session
*session
= cls_session
->dd_data
;
2348 spin_lock_bh(&session
->frwd_lock
);
2349 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
2350 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
2351 if (session
->leadconn
)
2352 wake_up(&session
->leadconn
->ehwait
);
2354 spin_unlock_bh(&session
->frwd_lock
);
2356 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
2359 * iscsi_eh_session_reset - drop session and attempt relogin
2362 * This function will wait for a relogin, session termination from
2363 * userspace, or a recovery/replacement timeout.
2365 int iscsi_eh_session_reset(struct scsi_cmnd
*sc
)
2367 struct iscsi_cls_session
*cls_session
;
2368 struct iscsi_session
*session
;
2369 struct iscsi_conn
*conn
;
2371 cls_session
= starget_to_session(scsi_target(sc
->device
));
2372 session
= cls_session
->dd_data
;
2373 conn
= session
->leadconn
;
2375 mutex_lock(&session
->eh_mutex
);
2376 spin_lock_bh(&session
->frwd_lock
);
2377 if (session
->state
== ISCSI_STATE_TERMINATE
) {
2379 ISCSI_DBG_EH(session
,
2380 "failing session reset: Could not log back into "
2381 "%s, %s [age %d]\n", session
->targetname
,
2382 conn
->persistent_address
, session
->age
);
2383 spin_unlock_bh(&session
->frwd_lock
);
2384 mutex_unlock(&session
->eh_mutex
);
2388 spin_unlock_bh(&session
->frwd_lock
);
2389 mutex_unlock(&session
->eh_mutex
);
2391 * we drop the lock here but the leadconn cannot be destoyed while
2392 * we are in the scsi eh
2394 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2396 ISCSI_DBG_EH(session
, "wait for relogin\n");
2397 wait_event_interruptible(conn
->ehwait
,
2398 session
->state
== ISCSI_STATE_TERMINATE
||
2399 session
->state
== ISCSI_STATE_LOGGED_IN
||
2400 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
2401 if (signal_pending(current
))
2402 flush_signals(current
);
2404 mutex_lock(&session
->eh_mutex
);
2405 spin_lock_bh(&session
->frwd_lock
);
2406 if (session
->state
== ISCSI_STATE_LOGGED_IN
) {
2407 ISCSI_DBG_EH(session
,
2408 "session reset succeeded for %s,%s\n",
2409 session
->targetname
, conn
->persistent_address
);
2412 spin_unlock_bh(&session
->frwd_lock
);
2413 mutex_unlock(&session
->eh_mutex
);
2416 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset
);
2418 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
2420 memset(hdr
, 0, sizeof(*hdr
));
2421 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
2422 hdr
->flags
= ISCSI_TM_FUNC_TARGET_WARM_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
2423 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2424 hdr
->rtt
= RESERVED_ITT
;
2428 * iscsi_eh_target_reset - reset target
2431 * This will attempt to send a warm target reset.
2433 int iscsi_eh_target_reset(struct scsi_cmnd
*sc
)
2435 struct iscsi_cls_session
*cls_session
;
2436 struct iscsi_session
*session
;
2437 struct iscsi_conn
*conn
;
2438 struct iscsi_tm
*hdr
;
2441 cls_session
= starget_to_session(scsi_target(sc
->device
));
2442 session
= cls_session
->dd_data
;
2444 ISCSI_DBG_EH(session
, "tgt Reset [sc %p tgt %s]\n", sc
,
2445 session
->targetname
);
2447 mutex_lock(&session
->eh_mutex
);
2448 spin_lock_bh(&session
->frwd_lock
);
2450 * Just check if we are not logged in. We cannot check for
2451 * the phase because the reset could come from a ioctl.
2453 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
2455 conn
= session
->leadconn
;
2457 /* only have one tmf outstanding at a time */
2458 if (conn
->tmf_state
!= TMF_INITIAL
)
2460 conn
->tmf_state
= TMF_QUEUED
;
2463 iscsi_prep_tgt_reset_pdu(sc
, hdr
);
2465 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
2466 session
->tgt_reset_timeout
)) {
2471 switch (conn
->tmf_state
) {
2475 spin_unlock_bh(&session
->frwd_lock
);
2476 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2479 conn
->tmf_state
= TMF_INITIAL
;
2484 spin_unlock_bh(&session
->frwd_lock
);
2486 iscsi_suspend_tx(conn
);
2488 spin_lock_bh(&session
->frwd_lock
);
2489 memset(hdr
, 0, sizeof(*hdr
));
2490 fail_scsi_tasks(conn
, -1, DID_ERROR
);
2491 conn
->tmf_state
= TMF_INITIAL
;
2492 spin_unlock_bh(&session
->frwd_lock
);
2494 iscsi_start_tx(conn
);
2498 spin_unlock_bh(&session
->frwd_lock
);
2500 ISCSI_DBG_EH(session
, "tgt %s reset result = %s\n", session
->targetname
,
2501 rc
== SUCCESS
? "SUCCESS" : "FAILED");
2502 mutex_unlock(&session
->eh_mutex
);
2505 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset
);
2508 * iscsi_eh_recover_target - reset target and possibly the session
2511 * This will attempt to send a warm target reset. If that fails,
2512 * we will escalate to ERL0 session recovery.
2514 int iscsi_eh_recover_target(struct scsi_cmnd
*sc
)
2518 rc
= iscsi_eh_target_reset(sc
);
2520 rc
= iscsi_eh_session_reset(sc
);
2523 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target
);
2526 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2527 * should be accessed via kfifo_{get,put} on q->queue.
2528 * Optionally, the caller can obtain the array of object pointers
2529 * by passing in a non-NULL @items pointer
2532 iscsi_pool_init(struct iscsi_pool
*q
, int max
, void ***items
, int item_size
)
2534 int i
, num_arrays
= 1;
2536 memset(q
, 0, sizeof(*q
));
2540 /* If the user passed an items pointer, he wants a copy of
2544 q
->pool
= kzalloc(num_arrays
* max
* sizeof(void*), GFP_KERNEL
);
2545 if (q
->pool
== NULL
)
2548 kfifo_init(&q
->queue
, (void*)q
->pool
, max
* sizeof(void*));
2550 for (i
= 0; i
< max
; i
++) {
2551 q
->pool
[i
] = kzalloc(item_size
, GFP_KERNEL
);
2552 if (q
->pool
[i
] == NULL
) {
2556 kfifo_in(&q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
2560 *items
= q
->pool
+ max
;
2561 memcpy(*items
, q
->pool
, max
* sizeof(void *));
2570 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
2572 void iscsi_pool_free(struct iscsi_pool
*q
)
2576 for (i
= 0; i
< q
->max
; i
++)
2580 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
2583 * iscsi_host_add - add host to system
2585 * @pdev: parent device
2587 * This should be called by partial offload and software iscsi drivers
2588 * to add a host to the system.
2590 int iscsi_host_add(struct Scsi_Host
*shost
, struct device
*pdev
)
2592 if (!shost
->can_queue
)
2593 shost
->can_queue
= ISCSI_DEF_XMIT_CMDS_MAX
;
2595 if (!shost
->cmd_per_lun
)
2596 shost
->cmd_per_lun
= ISCSI_DEF_CMD_PER_LUN
;
2598 if (!shost
->transportt
->eh_timed_out
)
2599 shost
->transportt
->eh_timed_out
= iscsi_eh_cmd_timed_out
;
2600 return scsi_add_host(shost
, pdev
);
2602 EXPORT_SYMBOL_GPL(iscsi_host_add
);
2605 * iscsi_host_alloc - allocate a host and driver data
2606 * @sht: scsi host template
2607 * @dd_data_size: driver host data size
2608 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2610 * This should be called by partial offload and software iscsi drivers.
2611 * To access the driver specific memory use the iscsi_host_priv() macro.
2613 struct Scsi_Host
*iscsi_host_alloc(struct scsi_host_template
*sht
,
2614 int dd_data_size
, bool xmit_can_sleep
)
2616 struct Scsi_Host
*shost
;
2617 struct iscsi_host
*ihost
;
2619 shost
= scsi_host_alloc(sht
, sizeof(struct iscsi_host
) + dd_data_size
);
2622 ihost
= shost_priv(shost
);
2624 if (xmit_can_sleep
) {
2625 snprintf(ihost
->workq_name
, sizeof(ihost
->workq_name
),
2626 "iscsi_q_%d", shost
->host_no
);
2627 ihost
->workq
= create_singlethread_workqueue(ihost
->workq_name
);
2632 spin_lock_init(&ihost
->lock
);
2633 ihost
->state
= ISCSI_HOST_SETUP
;
2634 ihost
->num_sessions
= 0;
2635 init_waitqueue_head(&ihost
->session_removal_wq
);
2639 scsi_host_put(shost
);
2642 EXPORT_SYMBOL_GPL(iscsi_host_alloc
);
2644 static void iscsi_notify_host_removed(struct iscsi_cls_session
*cls_session
)
2646 iscsi_session_failure(cls_session
->dd_data
, ISCSI_ERR_INVALID_HOST
);
2650 * iscsi_host_remove - remove host and sessions
2653 * If there are any sessions left, this will initiate the removal and wait
2654 * for the completion.
2656 void iscsi_host_remove(struct Scsi_Host
*shost
)
2658 struct iscsi_host
*ihost
= shost_priv(shost
);
2659 unsigned long flags
;
2661 spin_lock_irqsave(&ihost
->lock
, flags
);
2662 ihost
->state
= ISCSI_HOST_REMOVED
;
2663 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2665 iscsi_host_for_each_session(shost
, iscsi_notify_host_removed
);
2666 wait_event_interruptible(ihost
->session_removal_wq
,
2667 ihost
->num_sessions
== 0);
2668 if (signal_pending(current
))
2669 flush_signals(current
);
2671 scsi_remove_host(shost
);
2673 destroy_workqueue(ihost
->workq
);
2675 EXPORT_SYMBOL_GPL(iscsi_host_remove
);
2677 void iscsi_host_free(struct Scsi_Host
*shost
)
2679 struct iscsi_host
*ihost
= shost_priv(shost
);
2681 kfree(ihost
->netdev
);
2682 kfree(ihost
->hwaddress
);
2683 kfree(ihost
->initiatorname
);
2684 scsi_host_put(shost
);
2686 EXPORT_SYMBOL_GPL(iscsi_host_free
);
2688 static void iscsi_host_dec_session_cnt(struct Scsi_Host
*shost
)
2690 struct iscsi_host
*ihost
= shost_priv(shost
);
2691 unsigned long flags
;
2693 shost
= scsi_host_get(shost
);
2695 printk(KERN_ERR
"Invalid state. Cannot notify host removal "
2696 "of session teardown event because host already "
2701 spin_lock_irqsave(&ihost
->lock
, flags
);
2702 ihost
->num_sessions
--;
2703 if (ihost
->num_sessions
== 0)
2704 wake_up(&ihost
->session_removal_wq
);
2705 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2706 scsi_host_put(shost
);
2710 * iscsi_session_setup - create iscsi cls session and host and session
2711 * @iscsit: iscsi transport template
2713 * @cmds_max: session can queue
2714 * @cmd_task_size: LLD task private data size
2715 * @initial_cmdsn: initial CmdSN
2717 * This can be used by software iscsi_transports that allocate
2718 * a session per scsi host.
2720 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2721 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2722 * for nop handling and login/logout requests.
2724 struct iscsi_cls_session
*
2725 iscsi_session_setup(struct iscsi_transport
*iscsit
, struct Scsi_Host
*shost
,
2726 uint16_t cmds_max
, int dd_size
, int cmd_task_size
,
2727 uint32_t initial_cmdsn
, unsigned int id
)
2729 struct iscsi_host
*ihost
= shost_priv(shost
);
2730 struct iscsi_session
*session
;
2731 struct iscsi_cls_session
*cls_session
;
2732 int cmd_i
, scsi_cmds
, total_cmds
= cmds_max
;
2733 unsigned long flags
;
2735 spin_lock_irqsave(&ihost
->lock
, flags
);
2736 if (ihost
->state
== ISCSI_HOST_REMOVED
) {
2737 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2740 ihost
->num_sessions
++;
2741 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2744 total_cmds
= ISCSI_DEF_XMIT_CMDS_MAX
;
2746 * The iscsi layer needs some tasks for nop handling and tmfs,
2747 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2748 * + 1 command for scsi IO.
2750 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
) {
2751 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2752 "must be a power of two that is at least %d.\n",
2753 total_cmds
, ISCSI_TOTAL_CMDS_MIN
);
2754 goto dec_session_count
;
2757 if (total_cmds
> ISCSI_TOTAL_CMDS_MAX
) {
2758 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2759 "must be a power of 2 less than or equal to %d.\n",
2760 cmds_max
, ISCSI_TOTAL_CMDS_MAX
);
2761 total_cmds
= ISCSI_TOTAL_CMDS_MAX
;
2764 if (!is_power_of_2(total_cmds
)) {
2765 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2766 "must be a power of 2.\n", total_cmds
);
2767 total_cmds
= rounddown_pow_of_two(total_cmds
);
2768 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
)
2770 printk(KERN_INFO
"iscsi: Rounding can_queue to %d.\n",
2773 scsi_cmds
= total_cmds
- ISCSI_MGMT_CMDS_MAX
;
2775 cls_session
= iscsi_alloc_session(shost
, iscsit
,
2776 sizeof(struct iscsi_session
) +
2779 goto dec_session_count
;
2780 session
= cls_session
->dd_data
;
2781 session
->cls_session
= cls_session
;
2782 session
->host
= shost
;
2783 session
->state
= ISCSI_STATE_FREE
;
2784 session
->fast_abort
= 1;
2785 session
->tgt_reset_timeout
= 30;
2786 session
->lu_reset_timeout
= 15;
2787 session
->abort_timeout
= 10;
2788 session
->scsi_cmds_max
= scsi_cmds
;
2789 session
->cmds_max
= total_cmds
;
2790 session
->queued_cmdsn
= session
->cmdsn
= initial_cmdsn
;
2791 session
->exp_cmdsn
= initial_cmdsn
+ 1;
2792 session
->max_cmdsn
= initial_cmdsn
+ 1;
2793 session
->max_r2t
= 1;
2794 session
->tt
= iscsit
;
2795 session
->dd_data
= cls_session
->dd_data
+ sizeof(*session
);
2797 mutex_init(&session
->eh_mutex
);
2798 spin_lock_init(&session
->frwd_lock
);
2799 spin_lock_init(&session
->back_lock
);
2801 /* initialize SCSI PDU commands pool */
2802 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
2803 (void***)&session
->cmds
,
2804 cmd_task_size
+ sizeof(struct iscsi_task
)))
2805 goto cmdpool_alloc_fail
;
2807 /* pre-format cmds pool with ITT */
2808 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
2809 struct iscsi_task
*task
= session
->cmds
[cmd_i
];
2812 task
->dd_data
= &task
[1];
2814 task
->state
= ISCSI_TASK_FREE
;
2815 INIT_LIST_HEAD(&task
->running
);
2818 if (!try_module_get(iscsit
->owner
))
2819 goto module_get_fail
;
2821 if (iscsi_add_session(cls_session
, id
))
2822 goto cls_session_fail
;
2827 module_put(iscsit
->owner
);
2829 iscsi_pool_free(&session
->cmdpool
);
2831 iscsi_free_session(cls_session
);
2833 iscsi_host_dec_session_cnt(shost
);
2836 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
2839 * iscsi_session_teardown - destroy session, host, and cls_session
2840 * @cls_session: iscsi session
2842 * The driver must have called iscsi_remove_session before
2845 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
2847 struct iscsi_session
*session
= cls_session
->dd_data
;
2848 struct module
*owner
= cls_session
->transport
->owner
;
2849 struct Scsi_Host
*shost
= session
->host
;
2851 iscsi_pool_free(&session
->cmdpool
);
2853 kfree(session
->password
);
2854 kfree(session
->password_in
);
2855 kfree(session
->username
);
2856 kfree(session
->username_in
);
2857 kfree(session
->targetname
);
2858 kfree(session
->targetalias
);
2859 kfree(session
->initiatorname
);
2860 kfree(session
->boot_root
);
2861 kfree(session
->boot_nic
);
2862 kfree(session
->boot_target
);
2863 kfree(session
->ifacename
);
2864 kfree(session
->portal_type
);
2865 kfree(session
->discovery_parent_type
);
2867 iscsi_destroy_session(cls_session
);
2868 iscsi_host_dec_session_cnt(shost
);
2871 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
2874 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2875 * @cls_session: iscsi_cls_session
2876 * @dd_size: private driver data size
2879 struct iscsi_cls_conn
*
2880 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, int dd_size
,
2883 struct iscsi_session
*session
= cls_session
->dd_data
;
2884 struct iscsi_conn
*conn
;
2885 struct iscsi_cls_conn
*cls_conn
;
2888 cls_conn
= iscsi_create_conn(cls_session
, sizeof(*conn
) + dd_size
,
2892 conn
= cls_conn
->dd_data
;
2893 memset(conn
, 0, sizeof(*conn
) + dd_size
);
2895 conn
->dd_data
= cls_conn
->dd_data
+ sizeof(*conn
);
2896 conn
->session
= session
;
2897 conn
->cls_conn
= cls_conn
;
2898 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
2899 conn
->id
= conn_idx
;
2900 conn
->exp_statsn
= 0;
2901 conn
->tmf_state
= TMF_INITIAL
;
2903 init_timer(&conn
->transport_timer
);
2904 conn
->transport_timer
.data
= (unsigned long)conn
;
2905 conn
->transport_timer
.function
= iscsi_check_transport_timeouts
;
2907 INIT_LIST_HEAD(&conn
->mgmtqueue
);
2908 INIT_LIST_HEAD(&conn
->cmdqueue
);
2909 INIT_LIST_HEAD(&conn
->requeue
);
2910 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
2912 /* allocate login_task used for the login/text sequences */
2913 spin_lock_bh(&session
->frwd_lock
);
2914 if (!kfifo_out(&session
->cmdpool
.queue
,
2915 (void*)&conn
->login_task
,
2917 spin_unlock_bh(&session
->frwd_lock
);
2918 goto login_task_alloc_fail
;
2920 spin_unlock_bh(&session
->frwd_lock
);
2922 data
= (char *) __get_free_pages(GFP_KERNEL
,
2923 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN
));
2925 goto login_task_data_alloc_fail
;
2926 conn
->login_task
->data
= conn
->data
= data
;
2928 init_timer(&conn
->tmf_timer
);
2929 init_waitqueue_head(&conn
->ehwait
);
2933 login_task_data_alloc_fail
:
2934 kfifo_in(&session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2936 login_task_alloc_fail
:
2937 iscsi_destroy_conn(cls_conn
);
2940 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
2943 * iscsi_conn_teardown - teardown iscsi connection
2944 * cls_conn: iscsi class connection
2946 * TODO: we may need to make this into a two step process
2947 * like scsi-mls remove + put host
2949 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
2951 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2952 struct iscsi_session
*session
= conn
->session
;
2953 unsigned long flags
;
2955 del_timer_sync(&conn
->transport_timer
);
2957 spin_lock_bh(&session
->frwd_lock
);
2958 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
2959 if (session
->leadconn
== conn
) {
2961 * leading connection? then give up on recovery.
2963 session
->state
= ISCSI_STATE_TERMINATE
;
2964 wake_up(&conn
->ehwait
);
2966 spin_unlock_bh(&session
->frwd_lock
);
2969 * Block until all in-progress commands for this connection
2973 spin_lock_irqsave(session
->host
->host_lock
, flags
);
2974 if (!atomic_read(&session
->host
->host_busy
)) { /* OK for ERL == 0 */
2975 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2978 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2979 msleep_interruptible(500);
2980 iscsi_conn_printk(KERN_INFO
, conn
, "iscsi conn_destroy(): "
2981 "host_busy %d host_failed %d\n",
2982 atomic_read(&session
->host
->host_busy
),
2983 session
->host
->host_failed
);
2985 * force eh_abort() to unblock
2987 wake_up(&conn
->ehwait
);
2990 /* flush queued up work because we free the connection below */
2991 iscsi_suspend_tx(conn
);
2993 spin_lock_bh(&session
->frwd_lock
);
2994 free_pages((unsigned long) conn
->data
,
2995 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN
));
2996 kfree(conn
->persistent_address
);
2997 kfree(conn
->local_ipaddr
);
2998 /* regular RX path uses back_lock */
2999 spin_lock_bh(&session
->back_lock
);
3000 kfifo_in(&session
->cmdpool
.queue
, (void*)&conn
->login_task
,
3002 spin_unlock_bh(&session
->back_lock
);
3003 if (session
->leadconn
== conn
)
3004 session
->leadconn
= NULL
;
3005 spin_unlock_bh(&session
->frwd_lock
);
3007 iscsi_destroy_conn(cls_conn
);
3009 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
3011 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
3013 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3014 struct iscsi_session
*session
= conn
->session
;
3017 iscsi_conn_printk(KERN_ERR
, conn
,
3018 "can't start unbound connection\n");
3022 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
3023 session
->first_burst
> session
->max_burst
) {
3024 iscsi_conn_printk(KERN_INFO
, conn
, "invalid burst lengths: "
3025 "first_burst %d max_burst %d\n",
3026 session
->first_burst
, session
->max_burst
);
3030 if (conn
->ping_timeout
&& !conn
->recv_timeout
) {
3031 iscsi_conn_printk(KERN_ERR
, conn
, "invalid recv timeout of "
3032 "zero. Using 5 seconds\n.");
3033 conn
->recv_timeout
= 5;
3036 if (conn
->recv_timeout
&& !conn
->ping_timeout
) {
3037 iscsi_conn_printk(KERN_ERR
, conn
, "invalid ping timeout of "
3038 "zero. Using 5 seconds.\n");
3039 conn
->ping_timeout
= 5;
3042 spin_lock_bh(&session
->frwd_lock
);
3043 conn
->c_stage
= ISCSI_CONN_STARTED
;
3044 session
->state
= ISCSI_STATE_LOGGED_IN
;
3045 session
->queued_cmdsn
= session
->cmdsn
;
3047 conn
->last_recv
= jiffies
;
3048 conn
->last_ping
= jiffies
;
3049 if (conn
->recv_timeout
&& conn
->ping_timeout
)
3050 mod_timer(&conn
->transport_timer
,
3051 jiffies
+ (conn
->recv_timeout
* HZ
));
3053 switch(conn
->stop_stage
) {
3054 case STOP_CONN_RECOVER
:
3056 * unblock eh_abort() if it is blocked. re-try all
3057 * commands after successful recovery
3059 conn
->stop_stage
= 0;
3060 conn
->tmf_state
= TMF_INITIAL
;
3062 if (session
->age
== 16)
3065 case STOP_CONN_TERM
:
3066 conn
->stop_stage
= 0;
3071 spin_unlock_bh(&session
->frwd_lock
);
3073 iscsi_unblock_session(session
->cls_session
);
3074 wake_up(&conn
->ehwait
);
3077 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
3080 fail_mgmt_tasks(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
3082 struct iscsi_task
*task
;
3085 for (i
= 0; i
< conn
->session
->cmds_max
; i
++) {
3086 task
= conn
->session
->cmds
[i
];
3090 if (task
->state
== ISCSI_TASK_FREE
)
3093 ISCSI_DBG_SESSION(conn
->session
,
3094 "failing mgmt itt 0x%x state %d\n",
3095 task
->itt
, task
->state
);
3096 state
= ISCSI_TASK_ABRT_SESS_RECOV
;
3097 if (task
->state
== ISCSI_TASK_PENDING
)
3098 state
= ISCSI_TASK_COMPLETED
;
3099 iscsi_complete_task(task
, state
);
3104 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
3105 struct iscsi_conn
*conn
, int flag
)
3109 mutex_lock(&session
->eh_mutex
);
3110 spin_lock_bh(&session
->frwd_lock
);
3111 if (conn
->stop_stage
== STOP_CONN_TERM
) {
3112 spin_unlock_bh(&session
->frwd_lock
);
3113 mutex_unlock(&session
->eh_mutex
);
3118 * When this is called for the in_login state, we only want to clean
3119 * up the login task and connection. We do not need to block and set
3120 * the recovery state again
3122 if (flag
== STOP_CONN_TERM
)
3123 session
->state
= ISCSI_STATE_TERMINATE
;
3124 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
3125 session
->state
= ISCSI_STATE_IN_RECOVERY
;
3127 old_stop_stage
= conn
->stop_stage
;
3128 conn
->stop_stage
= flag
;
3129 spin_unlock_bh(&session
->frwd_lock
);
3131 del_timer_sync(&conn
->transport_timer
);
3132 iscsi_suspend_tx(conn
);
3134 spin_lock_bh(&session
->frwd_lock
);
3135 conn
->c_stage
= ISCSI_CONN_STOPPED
;
3136 spin_unlock_bh(&session
->frwd_lock
);
3139 * for connection level recovery we should not calculate
3140 * header digest. conn->hdr_size used for optimization
3141 * in hdr_extract() and will be re-negotiated at
3144 if (flag
== STOP_CONN_RECOVER
) {
3145 conn
->hdrdgst_en
= 0;
3146 conn
->datadgst_en
= 0;
3147 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
3148 old_stop_stage
!= STOP_CONN_RECOVER
) {
3149 ISCSI_DBG_SESSION(session
, "blocking session\n");
3150 iscsi_block_session(session
->cls_session
);
3157 spin_lock_bh(&session
->frwd_lock
);
3158 fail_scsi_tasks(conn
, -1, DID_TRANSPORT_DISRUPTED
);
3159 fail_mgmt_tasks(session
, conn
);
3160 memset(&conn
->tmhdr
, 0, sizeof(conn
->tmhdr
));
3161 spin_unlock_bh(&session
->frwd_lock
);
3162 mutex_unlock(&session
->eh_mutex
);
3165 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
3167 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3168 struct iscsi_session
*session
= conn
->session
;
3171 case STOP_CONN_RECOVER
:
3172 case STOP_CONN_TERM
:
3173 iscsi_start_session_recovery(session
, conn
, flag
);
3176 iscsi_conn_printk(KERN_ERR
, conn
,
3177 "invalid stop flag %d\n", flag
);
3180 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
3182 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
3183 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
3185 struct iscsi_session
*session
= cls_session
->dd_data
;
3186 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3188 spin_lock_bh(&session
->frwd_lock
);
3190 session
->leadconn
= conn
;
3191 spin_unlock_bh(&session
->frwd_lock
);
3194 * Unblock xmitworker(), Login Phase will pass through.
3196 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
3197 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
3200 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
3202 int iscsi_switch_str_param(char **param
, char *new_val_buf
)
3207 if (!strcmp(*param
, new_val_buf
))
3211 new_val
= kstrdup(new_val_buf
, GFP_NOIO
);
3219 EXPORT_SYMBOL_GPL(iscsi_switch_str_param
);
3221 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
3222 enum iscsi_param param
, char *buf
, int buflen
)
3224 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3225 struct iscsi_session
*session
= conn
->session
;
3229 case ISCSI_PARAM_FAST_ABORT
:
3230 sscanf(buf
, "%d", &session
->fast_abort
);
3232 case ISCSI_PARAM_ABORT_TMO
:
3233 sscanf(buf
, "%d", &session
->abort_timeout
);
3235 case ISCSI_PARAM_LU_RESET_TMO
:
3236 sscanf(buf
, "%d", &session
->lu_reset_timeout
);
3238 case ISCSI_PARAM_TGT_RESET_TMO
:
3239 sscanf(buf
, "%d", &session
->tgt_reset_timeout
);
3241 case ISCSI_PARAM_PING_TMO
:
3242 sscanf(buf
, "%d", &conn
->ping_timeout
);
3244 case ISCSI_PARAM_RECV_TMO
:
3245 sscanf(buf
, "%d", &conn
->recv_timeout
);
3247 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
3248 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
3250 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
3251 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
3253 case ISCSI_PARAM_HDRDGST_EN
:
3254 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
3256 case ISCSI_PARAM_DATADGST_EN
:
3257 sscanf(buf
, "%d", &conn
->datadgst_en
);
3259 case ISCSI_PARAM_INITIAL_R2T_EN
:
3260 sscanf(buf
, "%d", &session
->initial_r2t_en
);
3262 case ISCSI_PARAM_MAX_R2T
:
3263 sscanf(buf
, "%hu", &session
->max_r2t
);
3265 case ISCSI_PARAM_IMM_DATA_EN
:
3266 sscanf(buf
, "%d", &session
->imm_data_en
);
3268 case ISCSI_PARAM_FIRST_BURST
:
3269 sscanf(buf
, "%d", &session
->first_burst
);
3271 case ISCSI_PARAM_MAX_BURST
:
3272 sscanf(buf
, "%d", &session
->max_burst
);
3274 case ISCSI_PARAM_PDU_INORDER_EN
:
3275 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
3277 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
3278 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
3280 case ISCSI_PARAM_ERL
:
3281 sscanf(buf
, "%d", &session
->erl
);
3283 case ISCSI_PARAM_EXP_STATSN
:
3284 sscanf(buf
, "%u", &conn
->exp_statsn
);
3286 case ISCSI_PARAM_USERNAME
:
3287 return iscsi_switch_str_param(&session
->username
, buf
);
3288 case ISCSI_PARAM_USERNAME_IN
:
3289 return iscsi_switch_str_param(&session
->username_in
, buf
);
3290 case ISCSI_PARAM_PASSWORD
:
3291 return iscsi_switch_str_param(&session
->password
, buf
);
3292 case ISCSI_PARAM_PASSWORD_IN
:
3293 return iscsi_switch_str_param(&session
->password_in
, buf
);
3294 case ISCSI_PARAM_TARGET_NAME
:
3295 return iscsi_switch_str_param(&session
->targetname
, buf
);
3296 case ISCSI_PARAM_TARGET_ALIAS
:
3297 return iscsi_switch_str_param(&session
->targetalias
, buf
);
3298 case ISCSI_PARAM_TPGT
:
3299 sscanf(buf
, "%d", &session
->tpgt
);
3301 case ISCSI_PARAM_PERSISTENT_PORT
:
3302 sscanf(buf
, "%d", &conn
->persistent_port
);
3304 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
3305 return iscsi_switch_str_param(&conn
->persistent_address
, buf
);
3306 case ISCSI_PARAM_IFACE_NAME
:
3307 return iscsi_switch_str_param(&session
->ifacename
, buf
);
3308 case ISCSI_PARAM_INITIATOR_NAME
:
3309 return iscsi_switch_str_param(&session
->initiatorname
, buf
);
3310 case ISCSI_PARAM_BOOT_ROOT
:
3311 return iscsi_switch_str_param(&session
->boot_root
, buf
);
3312 case ISCSI_PARAM_BOOT_NIC
:
3313 return iscsi_switch_str_param(&session
->boot_nic
, buf
);
3314 case ISCSI_PARAM_BOOT_TARGET
:
3315 return iscsi_switch_str_param(&session
->boot_target
, buf
);
3316 case ISCSI_PARAM_PORTAL_TYPE
:
3317 return iscsi_switch_str_param(&session
->portal_type
, buf
);
3318 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE
:
3319 return iscsi_switch_str_param(&session
->discovery_parent_type
,
3321 case ISCSI_PARAM_DISCOVERY_SESS
:
3322 sscanf(buf
, "%d", &val
);
3323 session
->discovery_sess
= !!val
;
3325 case ISCSI_PARAM_LOCAL_IPADDR
:
3326 return iscsi_switch_str_param(&conn
->local_ipaddr
, buf
);
3333 EXPORT_SYMBOL_GPL(iscsi_set_param
);
3335 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
3336 enum iscsi_param param
, char *buf
)
3338 struct iscsi_session
*session
= cls_session
->dd_data
;
3342 case ISCSI_PARAM_FAST_ABORT
:
3343 len
= sprintf(buf
, "%d\n", session
->fast_abort
);
3345 case ISCSI_PARAM_ABORT_TMO
:
3346 len
= sprintf(buf
, "%d\n", session
->abort_timeout
);
3348 case ISCSI_PARAM_LU_RESET_TMO
:
3349 len
= sprintf(buf
, "%d\n", session
->lu_reset_timeout
);
3351 case ISCSI_PARAM_TGT_RESET_TMO
:
3352 len
= sprintf(buf
, "%d\n", session
->tgt_reset_timeout
);
3354 case ISCSI_PARAM_INITIAL_R2T_EN
:
3355 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
3357 case ISCSI_PARAM_MAX_R2T
:
3358 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
3360 case ISCSI_PARAM_IMM_DATA_EN
:
3361 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
3363 case ISCSI_PARAM_FIRST_BURST
:
3364 len
= sprintf(buf
, "%u\n", session
->first_burst
);
3366 case ISCSI_PARAM_MAX_BURST
:
3367 len
= sprintf(buf
, "%u\n", session
->max_burst
);
3369 case ISCSI_PARAM_PDU_INORDER_EN
:
3370 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
3372 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
3373 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
3375 case ISCSI_PARAM_DEF_TASKMGMT_TMO
:
3376 len
= sprintf(buf
, "%d\n", session
->def_taskmgmt_tmo
);
3378 case ISCSI_PARAM_ERL
:
3379 len
= sprintf(buf
, "%d\n", session
->erl
);
3381 case ISCSI_PARAM_TARGET_NAME
:
3382 len
= sprintf(buf
, "%s\n", session
->targetname
);
3384 case ISCSI_PARAM_TARGET_ALIAS
:
3385 len
= sprintf(buf
, "%s\n", session
->targetalias
);
3387 case ISCSI_PARAM_TPGT
:
3388 len
= sprintf(buf
, "%d\n", session
->tpgt
);
3390 case ISCSI_PARAM_USERNAME
:
3391 len
= sprintf(buf
, "%s\n", session
->username
);
3393 case ISCSI_PARAM_USERNAME_IN
:
3394 len
= sprintf(buf
, "%s\n", session
->username_in
);
3396 case ISCSI_PARAM_PASSWORD
:
3397 len
= sprintf(buf
, "%s\n", session
->password
);
3399 case ISCSI_PARAM_PASSWORD_IN
:
3400 len
= sprintf(buf
, "%s\n", session
->password_in
);
3402 case ISCSI_PARAM_IFACE_NAME
:
3403 len
= sprintf(buf
, "%s\n", session
->ifacename
);
3405 case ISCSI_PARAM_INITIATOR_NAME
:
3406 len
= sprintf(buf
, "%s\n", session
->initiatorname
);
3408 case ISCSI_PARAM_BOOT_ROOT
:
3409 len
= sprintf(buf
, "%s\n", session
->boot_root
);
3411 case ISCSI_PARAM_BOOT_NIC
:
3412 len
= sprintf(buf
, "%s\n", session
->boot_nic
);
3414 case ISCSI_PARAM_BOOT_TARGET
:
3415 len
= sprintf(buf
, "%s\n", session
->boot_target
);
3417 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE
:
3418 len
= sprintf(buf
, "%u\n", session
->auto_snd_tgt_disable
);
3420 case ISCSI_PARAM_DISCOVERY_SESS
:
3421 len
= sprintf(buf
, "%u\n", session
->discovery_sess
);
3423 case ISCSI_PARAM_PORTAL_TYPE
:
3424 len
= sprintf(buf
, "%s\n", session
->portal_type
);
3426 case ISCSI_PARAM_CHAP_AUTH_EN
:
3427 len
= sprintf(buf
, "%u\n", session
->chap_auth_en
);
3429 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN
:
3430 len
= sprintf(buf
, "%u\n", session
->discovery_logout_en
);
3432 case ISCSI_PARAM_BIDI_CHAP_EN
:
3433 len
= sprintf(buf
, "%u\n", session
->bidi_chap_en
);
3435 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL
:
3436 len
= sprintf(buf
, "%u\n", session
->discovery_auth_optional
);
3438 case ISCSI_PARAM_DEF_TIME2WAIT
:
3439 len
= sprintf(buf
, "%d\n", session
->time2wait
);
3441 case ISCSI_PARAM_DEF_TIME2RETAIN
:
3442 len
= sprintf(buf
, "%d\n", session
->time2retain
);
3444 case ISCSI_PARAM_TSID
:
3445 len
= sprintf(buf
, "%u\n", session
->tsid
);
3447 case ISCSI_PARAM_ISID
:
3448 len
= sprintf(buf
, "%02x%02x%02x%02x%02x%02x\n",
3449 session
->isid
[0], session
->isid
[1],
3450 session
->isid
[2], session
->isid
[3],
3451 session
->isid
[4], session
->isid
[5]);
3453 case ISCSI_PARAM_DISCOVERY_PARENT_IDX
:
3454 len
= sprintf(buf
, "%u\n", session
->discovery_parent_idx
);
3456 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE
:
3457 if (session
->discovery_parent_type
)
3458 len
= sprintf(buf
, "%s\n",
3459 session
->discovery_parent_type
);
3461 len
= sprintf(buf
, "\n");
3469 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
3471 int iscsi_conn_get_addr_param(struct sockaddr_storage
*addr
,
3472 enum iscsi_param param
, char *buf
)
3474 struct sockaddr_in6
*sin6
= NULL
;
3475 struct sockaddr_in
*sin
= NULL
;
3478 switch (addr
->ss_family
) {
3480 sin
= (struct sockaddr_in
*)addr
;
3483 sin6
= (struct sockaddr_in6
*)addr
;
3490 case ISCSI_PARAM_CONN_ADDRESS
:
3491 case ISCSI_HOST_PARAM_IPADDRESS
:
3493 len
= sprintf(buf
, "%pI4\n", &sin
->sin_addr
.s_addr
);
3495 len
= sprintf(buf
, "%pI6\n", &sin6
->sin6_addr
);
3497 case ISCSI_PARAM_CONN_PORT
:
3499 len
= sprintf(buf
, "%hu\n", be16_to_cpu(sin
->sin_port
));
3501 len
= sprintf(buf
, "%hu\n",
3502 be16_to_cpu(sin6
->sin6_port
));
3510 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param
);
3512 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
3513 enum iscsi_param param
, char *buf
)
3515 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3519 case ISCSI_PARAM_PING_TMO
:
3520 len
= sprintf(buf
, "%u\n", conn
->ping_timeout
);
3522 case ISCSI_PARAM_RECV_TMO
:
3523 len
= sprintf(buf
, "%u\n", conn
->recv_timeout
);
3525 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
3526 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
3528 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
3529 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
3531 case ISCSI_PARAM_HDRDGST_EN
:
3532 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
3534 case ISCSI_PARAM_DATADGST_EN
:
3535 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
3537 case ISCSI_PARAM_IFMARKER_EN
:
3538 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
3540 case ISCSI_PARAM_OFMARKER_EN
:
3541 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
3543 case ISCSI_PARAM_EXP_STATSN
:
3544 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
3546 case ISCSI_PARAM_PERSISTENT_PORT
:
3547 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
3549 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
3550 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
3552 case ISCSI_PARAM_STATSN
:
3553 len
= sprintf(buf
, "%u\n", conn
->statsn
);
3555 case ISCSI_PARAM_MAX_SEGMENT_SIZE
:
3556 len
= sprintf(buf
, "%u\n", conn
->max_segment_size
);
3558 case ISCSI_PARAM_KEEPALIVE_TMO
:
3559 len
= sprintf(buf
, "%u\n", conn
->keepalive_tmo
);
3561 case ISCSI_PARAM_LOCAL_PORT
:
3562 len
= sprintf(buf
, "%u\n", conn
->local_port
);
3564 case ISCSI_PARAM_TCP_TIMESTAMP_STAT
:
3565 len
= sprintf(buf
, "%u\n", conn
->tcp_timestamp_stat
);
3567 case ISCSI_PARAM_TCP_NAGLE_DISABLE
:
3568 len
= sprintf(buf
, "%u\n", conn
->tcp_nagle_disable
);
3570 case ISCSI_PARAM_TCP_WSF_DISABLE
:
3571 len
= sprintf(buf
, "%u\n", conn
->tcp_wsf_disable
);
3573 case ISCSI_PARAM_TCP_TIMER_SCALE
:
3574 len
= sprintf(buf
, "%u\n", conn
->tcp_timer_scale
);
3576 case ISCSI_PARAM_TCP_TIMESTAMP_EN
:
3577 len
= sprintf(buf
, "%u\n", conn
->tcp_timestamp_en
);
3579 case ISCSI_PARAM_IP_FRAGMENT_DISABLE
:
3580 len
= sprintf(buf
, "%u\n", conn
->fragment_disable
);
3582 case ISCSI_PARAM_IPV4_TOS
:
3583 len
= sprintf(buf
, "%u\n", conn
->ipv4_tos
);
3585 case ISCSI_PARAM_IPV6_TC
:
3586 len
= sprintf(buf
, "%u\n", conn
->ipv6_traffic_class
);
3588 case ISCSI_PARAM_IPV6_FLOW_LABEL
:
3589 len
= sprintf(buf
, "%u\n", conn
->ipv6_flow_label
);
3591 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6
:
3592 len
= sprintf(buf
, "%u\n", conn
->is_fw_assigned_ipv6
);
3594 case ISCSI_PARAM_TCP_XMIT_WSF
:
3595 len
= sprintf(buf
, "%u\n", conn
->tcp_xmit_wsf
);
3597 case ISCSI_PARAM_TCP_RECV_WSF
:
3598 len
= sprintf(buf
, "%u\n", conn
->tcp_recv_wsf
);
3600 case ISCSI_PARAM_LOCAL_IPADDR
:
3601 len
= sprintf(buf
, "%s\n", conn
->local_ipaddr
);
3609 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
3611 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
3614 struct iscsi_host
*ihost
= shost_priv(shost
);
3618 case ISCSI_HOST_PARAM_NETDEV_NAME
:
3619 len
= sprintf(buf
, "%s\n", ihost
->netdev
);
3621 case ISCSI_HOST_PARAM_HWADDRESS
:
3622 len
= sprintf(buf
, "%s\n", ihost
->hwaddress
);
3624 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
3625 len
= sprintf(buf
, "%s\n", ihost
->initiatorname
);
3633 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
3635 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
3636 char *buf
, int buflen
)
3638 struct iscsi_host
*ihost
= shost_priv(shost
);
3641 case ISCSI_HOST_PARAM_NETDEV_NAME
:
3642 return iscsi_switch_str_param(&ihost
->netdev
, buf
);
3643 case ISCSI_HOST_PARAM_HWADDRESS
:
3644 return iscsi_switch_str_param(&ihost
->hwaddress
, buf
);
3645 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
3646 return iscsi_switch_str_param(&ihost
->initiatorname
, buf
);
3653 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
3655 MODULE_AUTHOR("Mike Christie");
3656 MODULE_DESCRIPTION("iSCSI library functions");
3657 MODULE_LICENSE("GPL");