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/sched/signal.h>
30 #include <linux/module.h>
31 #include <asm/unaligned.h>
33 #include <scsi/scsi_cmnd.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_eh.h>
36 #include <scsi/scsi_tcq.h>
37 #include <scsi/scsi_host.h>
38 #include <scsi/scsi.h>
39 #include <scsi/iscsi_proto.h>
40 #include <scsi/scsi_transport.h>
41 #include <scsi/scsi_transport_iscsi.h>
42 #include <scsi/libiscsi.h>
44 static int iscsi_dbg_lib_conn
;
45 module_param_named(debug_libiscsi_conn
, iscsi_dbg_lib_conn
, int,
47 MODULE_PARM_DESC(debug_libiscsi_conn
,
48 "Turn on debugging for connections in libiscsi module. "
49 "Set to 1 to turn on, and zero to turn off. Default is off.");
51 static int iscsi_dbg_lib_session
;
52 module_param_named(debug_libiscsi_session
, iscsi_dbg_lib_session
, int,
54 MODULE_PARM_DESC(debug_libiscsi_session
,
55 "Turn on debugging for sessions in libiscsi module. "
56 "Set to 1 to turn on, and zero to turn off. Default is off.");
58 static int iscsi_dbg_lib_eh
;
59 module_param_named(debug_libiscsi_eh
, iscsi_dbg_lib_eh
, int,
61 MODULE_PARM_DESC(debug_libiscsi_eh
,
62 "Turn on debugging for error handling in libiscsi module. "
63 "Set to 1 to turn on, and zero to turn off. Default is off.");
65 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
67 if (iscsi_dbg_lib_conn) \
68 iscsi_conn_printk(KERN_INFO, _conn, \
73 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
75 if (iscsi_dbg_lib_session) \
76 iscsi_session_printk(KERN_INFO, _session, \
81 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
83 if (iscsi_dbg_lib_eh) \
84 iscsi_session_printk(KERN_INFO, _session, \
89 inline void iscsi_conn_queue_work(struct iscsi_conn
*conn
)
91 struct Scsi_Host
*shost
= conn
->session
->host
;
92 struct iscsi_host
*ihost
= shost_priv(shost
);
95 queue_work(ihost
->workq
, &conn
->xmitwork
);
97 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work
);
99 static void __iscsi_update_cmdsn(struct iscsi_session
*session
,
100 uint32_t exp_cmdsn
, uint32_t max_cmdsn
)
103 * standard specifies this check for when to update expected and
104 * max sequence numbers
106 if (iscsi_sna_lt(max_cmdsn
, exp_cmdsn
- 1))
109 if (exp_cmdsn
!= session
->exp_cmdsn
&&
110 !iscsi_sna_lt(exp_cmdsn
, session
->exp_cmdsn
))
111 session
->exp_cmdsn
= exp_cmdsn
;
113 if (max_cmdsn
!= session
->max_cmdsn
&&
114 !iscsi_sna_lt(max_cmdsn
, session
->max_cmdsn
))
115 session
->max_cmdsn
= max_cmdsn
;
118 void iscsi_update_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
120 __iscsi_update_cmdsn(session
, be32_to_cpu(hdr
->exp_cmdsn
),
121 be32_to_cpu(hdr
->max_cmdsn
));
123 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn
);
126 * iscsi_prep_data_out_pdu - initialize Data-Out
127 * @task: scsi command task
129 * @hdr: iscsi data in pdu
132 * Initialize Data-Out within this R2T sequence and finds
133 * proper data_offset within this SCSI command.
135 * This function is called with connection lock taken.
137 void iscsi_prep_data_out_pdu(struct iscsi_task
*task
, struct iscsi_r2t_info
*r2t
,
138 struct iscsi_data
*hdr
)
140 struct iscsi_conn
*conn
= task
->conn
;
141 unsigned int left
= r2t
->data_length
- r2t
->sent
;
143 task
->hdr_len
= sizeof(struct iscsi_data
);
145 memset(hdr
, 0, sizeof(struct iscsi_data
));
147 hdr
->datasn
= cpu_to_be32(r2t
->datasn
);
149 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
150 hdr
->lun
= task
->lun
;
151 hdr
->itt
= task
->hdr_itt
;
152 hdr
->exp_statsn
= r2t
->exp_statsn
;
153 hdr
->offset
= cpu_to_be32(r2t
->data_offset
+ r2t
->sent
);
154 if (left
> conn
->max_xmit_dlength
) {
155 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
156 r2t
->data_count
= conn
->max_xmit_dlength
;
159 hton24(hdr
->dlength
, left
);
160 r2t
->data_count
= left
;
161 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
163 conn
->dataout_pdus_cnt
++;
165 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu
);
167 static int iscsi_add_hdr(struct iscsi_task
*task
, unsigned len
)
169 unsigned exp_len
= task
->hdr_len
+ len
;
171 if (exp_len
> task
->hdr_max
) {
176 WARN_ON(len
& (ISCSI_PAD_LEN
- 1)); /* caller must pad the AHS */
177 task
->hdr_len
= exp_len
;
182 * make an extended cdb AHS
184 static int iscsi_prep_ecdb_ahs(struct iscsi_task
*task
)
186 struct scsi_cmnd
*cmd
= task
->sc
;
187 unsigned rlen
, pad_len
;
188 unsigned short ahslength
;
189 struct iscsi_ecdb_ahdr
*ecdb_ahdr
;
192 ecdb_ahdr
= iscsi_next_hdr(task
);
193 rlen
= cmd
->cmd_len
- ISCSI_CDB_SIZE
;
195 BUG_ON(rlen
> sizeof(ecdb_ahdr
->ecdb
));
196 ahslength
= rlen
+ sizeof(ecdb_ahdr
->reserved
);
198 pad_len
= iscsi_padding(rlen
);
200 rc
= iscsi_add_hdr(task
, sizeof(ecdb_ahdr
->ahslength
) +
201 sizeof(ecdb_ahdr
->ahstype
) + ahslength
+ pad_len
);
206 memset(&ecdb_ahdr
->ecdb
[rlen
], 0, pad_len
);
208 ecdb_ahdr
->ahslength
= cpu_to_be16(ahslength
);
209 ecdb_ahdr
->ahstype
= ISCSI_AHSTYPE_CDB
;
210 ecdb_ahdr
->reserved
= 0;
211 memcpy(ecdb_ahdr
->ecdb
, cmd
->cmnd
+ ISCSI_CDB_SIZE
, rlen
);
213 ISCSI_DBG_SESSION(task
->conn
->session
,
214 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
215 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
216 "%u\n", cmd
->cmd_len
, rlen
, pad_len
, ahslength
,
221 static int iscsi_prep_bidi_ahs(struct iscsi_task
*task
)
223 struct scsi_cmnd
*sc
= task
->sc
;
224 struct iscsi_rlength_ahdr
*rlen_ahdr
;
227 rlen_ahdr
= iscsi_next_hdr(task
);
228 rc
= iscsi_add_hdr(task
, sizeof(*rlen_ahdr
));
232 rlen_ahdr
->ahslength
=
233 cpu_to_be16(sizeof(rlen_ahdr
->read_length
) +
234 sizeof(rlen_ahdr
->reserved
));
235 rlen_ahdr
->ahstype
= ISCSI_AHSTYPE_RLENGTH
;
236 rlen_ahdr
->reserved
= 0;
237 rlen_ahdr
->read_length
= cpu_to_be32(scsi_in(sc
)->length
);
239 ISCSI_DBG_SESSION(task
->conn
->session
,
240 "bidi-in rlen_ahdr->read_length(%d) "
241 "rlen_ahdr->ahslength(%d)\n",
242 be32_to_cpu(rlen_ahdr
->read_length
),
243 be16_to_cpu(rlen_ahdr
->ahslength
));
248 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
250 * @opcode: opcode to check for
252 * During TMF a task has to be checked if it's affected.
253 * All unrelated I/O can be passed through, but I/O to the
254 * affected LUN should be restricted.
255 * If 'fast_abort' is set we won't be sending any I/O to the
257 * Otherwise the target is waiting for all TTTs to be completed,
258 * so we have to send all outstanding Data-Out PDUs to the target.
260 static int iscsi_check_tmf_restrictions(struct iscsi_task
*task
, int opcode
)
262 struct iscsi_conn
*conn
= task
->conn
;
263 struct iscsi_tm
*tmf
= &conn
->tmhdr
;
266 if (conn
->tmf_state
== TMF_INITIAL
)
269 if ((tmf
->opcode
& ISCSI_OPCODE_MASK
) != ISCSI_OP_SCSI_TMFUNC
)
272 switch (ISCSI_TM_FUNC_VALUE(tmf
)) {
273 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
275 * Allow PDUs for unrelated LUNs
277 hdr_lun
= scsilun_to_int(&tmf
->lun
);
278 if (hdr_lun
!= task
->sc
->device
->lun
)
281 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
283 * Fail all SCSI cmd PDUs
285 if (opcode
!= ISCSI_OP_SCSI_DATA_OUT
) {
286 iscsi_conn_printk(KERN_INFO
, conn
,
295 * And also all data-out PDUs in response to R2T
296 * if fast_abort is set.
298 if (conn
->session
->fast_abort
) {
299 iscsi_conn_printk(KERN_INFO
, conn
,
301 "0x%x/0x%x] fast abort.\n",
307 case ISCSI_TM_FUNC_ABORT_TASK
:
309 * the caller has already checked if the task
310 * they want to abort was in the pending queue so if
311 * we are here the cmd pdu has gone out already, and
312 * we will only hit this for data-outs
314 if (opcode
== ISCSI_OP_SCSI_DATA_OUT
&&
315 task
->hdr_itt
== tmf
->rtt
) {
316 ISCSI_DBG_SESSION(conn
->session
,
317 "Preventing task %x/%x from sending "
318 "data-out due to abort task in "
319 "progress\n", task
->itt
,
330 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
333 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
334 * fields like dlength or final based on how much data it sends
336 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task
*task
)
338 struct iscsi_conn
*conn
= task
->conn
;
339 struct iscsi_session
*session
= conn
->session
;
340 struct scsi_cmnd
*sc
= task
->sc
;
341 struct iscsi_scsi_req
*hdr
;
342 unsigned hdrlength
, cmd_len
, transfer_length
;
346 rc
= iscsi_check_tmf_restrictions(task
, ISCSI_OP_SCSI_CMD
);
350 if (conn
->session
->tt
->alloc_pdu
) {
351 rc
= conn
->session
->tt
->alloc_pdu(task
, ISCSI_OP_SCSI_CMD
);
355 hdr
= (struct iscsi_scsi_req
*)task
->hdr
;
357 memset(hdr
, 0, sizeof(*hdr
));
359 if (session
->tt
->parse_pdu_itt
)
360 hdr
->itt
= task
->hdr_itt
= itt
;
362 hdr
->itt
= task
->hdr_itt
= build_itt(task
->itt
,
363 task
->conn
->session
->age
);
365 rc
= iscsi_add_hdr(task
, sizeof(*hdr
));
368 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
369 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
370 int_to_scsilun(sc
->device
->lun
, &hdr
->lun
);
371 task
->lun
= hdr
->lun
;
372 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
373 cmd_len
= sc
->cmd_len
;
374 if (cmd_len
< ISCSI_CDB_SIZE
)
375 memset(&hdr
->cdb
[cmd_len
], 0, ISCSI_CDB_SIZE
- cmd_len
);
376 else if (cmd_len
> ISCSI_CDB_SIZE
) {
377 rc
= iscsi_prep_ecdb_ahs(task
);
380 cmd_len
= ISCSI_CDB_SIZE
;
382 memcpy(hdr
->cdb
, sc
->cmnd
, cmd_len
);
385 if (scsi_bidi_cmnd(sc
)) {
386 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
387 rc
= iscsi_prep_bidi_ahs(task
);
392 if (scsi_get_prot_op(sc
) != SCSI_PROT_NORMAL
)
393 task
->protected = true;
395 transfer_length
= scsi_transfer_length(sc
);
396 hdr
->data_length
= cpu_to_be32(transfer_length
);
397 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
398 struct iscsi_r2t_info
*r2t
= &task
->unsol_r2t
;
400 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
404 * imm_count bytes to be sent right after
407 * unsol_count bytes(as Data-Out) to be sent
408 * without R2T ack right after
411 * r2t data_length bytes to be sent via R2T ack's
413 * pad_count bytes to be sent as zero-padding
415 memset(r2t
, 0, sizeof(*r2t
));
417 if (session
->imm_data_en
) {
418 if (transfer_length
>= session
->first_burst
)
419 task
->imm_count
= min(session
->first_burst
,
420 conn
->max_xmit_dlength
);
422 task
->imm_count
= min(transfer_length
,
423 conn
->max_xmit_dlength
);
424 hton24(hdr
->dlength
, task
->imm_count
);
426 zero_data(hdr
->dlength
);
428 if (!session
->initial_r2t_en
) {
429 r2t
->data_length
= min(session
->first_burst
,
432 r2t
->data_offset
= task
->imm_count
;
433 r2t
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
434 r2t
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
437 if (!task
->unsol_r2t
.data_length
)
438 /* No unsolicit Data-Out's */
439 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
441 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
442 zero_data(hdr
->dlength
);
444 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
445 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
448 /* calculate size of additional header segments (AHSs) */
449 hdrlength
= task
->hdr_len
- sizeof(*hdr
);
451 WARN_ON(hdrlength
& (ISCSI_PAD_LEN
-1));
452 hdrlength
/= ISCSI_PAD_LEN
;
454 WARN_ON(hdrlength
>= 256);
455 hdr
->hlength
= hdrlength
& 0xFF;
456 hdr
->cmdsn
= task
->cmdsn
= cpu_to_be32(session
->cmdsn
);
458 if (session
->tt
->init_task
&& session
->tt
->init_task(task
))
461 task
->state
= ISCSI_TASK_RUNNING
;
464 conn
->scsicmd_pdus_cnt
++;
465 ISCSI_DBG_SESSION(session
, "iscsi prep [%s cid %d sc %p cdb 0x%x "
466 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
467 scsi_bidi_cmnd(sc
) ? "bidirectional" :
468 sc
->sc_data_direction
== DMA_TO_DEVICE
?
469 "write" : "read", conn
->id
, sc
, sc
->cmnd
[0],
470 task
->itt
, transfer_length
,
471 scsi_bidi_cmnd(sc
) ? scsi_in(sc
)->length
: 0,
473 session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
478 * iscsi_free_task - free a task
479 * @task: iscsi cmd task
481 * Must be called with session back_lock.
482 * This function returns the scsi command to scsi-ml or cleans
483 * up mgmt tasks then returns the task to the pool.
485 static void iscsi_free_task(struct iscsi_task
*task
)
487 struct iscsi_conn
*conn
= task
->conn
;
488 struct iscsi_session
*session
= conn
->session
;
489 struct scsi_cmnd
*sc
= task
->sc
;
490 int oldstate
= task
->state
;
492 ISCSI_DBG_SESSION(session
, "freeing task itt 0x%x state %d sc %p\n",
493 task
->itt
, task
->state
, task
->sc
);
495 session
->tt
->cleanup_task(task
);
496 task
->state
= ISCSI_TASK_FREE
;
499 * login task is preallocated so do not free
501 if (conn
->login_task
== task
)
504 kfifo_in(&session
->cmdpool
.queue
, (void*)&task
, sizeof(void*));
507 /* SCSI eh reuses commands to verify us */
510 * queue command may call this to free the task, so
511 * it will decide how to return sc to scsi-ml.
513 if (oldstate
!= ISCSI_TASK_REQUEUE_SCSIQ
)
518 void __iscsi_get_task(struct iscsi_task
*task
)
520 refcount_inc(&task
->refcount
);
522 EXPORT_SYMBOL_GPL(__iscsi_get_task
);
524 void __iscsi_put_task(struct iscsi_task
*task
)
526 if (refcount_dec_and_test(&task
->refcount
))
527 iscsi_free_task(task
);
529 EXPORT_SYMBOL_GPL(__iscsi_put_task
);
531 void iscsi_put_task(struct iscsi_task
*task
)
533 struct iscsi_session
*session
= task
->conn
->session
;
535 /* regular RX path uses back_lock */
536 spin_lock_bh(&session
->back_lock
);
537 __iscsi_put_task(task
);
538 spin_unlock_bh(&session
->back_lock
);
540 EXPORT_SYMBOL_GPL(iscsi_put_task
);
543 * iscsi_complete_task - finish a task
544 * @task: iscsi cmd task
545 * @state: state to complete task with
547 * Must be called with session back_lock.
549 static void iscsi_complete_task(struct iscsi_task
*task
, int state
)
551 struct iscsi_conn
*conn
= task
->conn
;
553 ISCSI_DBG_SESSION(conn
->session
,
554 "complete task itt 0x%x state %d sc %p\n",
555 task
->itt
, task
->state
, task
->sc
);
556 if (task
->state
== ISCSI_TASK_COMPLETED
||
557 task
->state
== ISCSI_TASK_ABRT_TMF
||
558 task
->state
== ISCSI_TASK_ABRT_SESS_RECOV
||
559 task
->state
== ISCSI_TASK_REQUEUE_SCSIQ
)
561 WARN_ON_ONCE(task
->state
== ISCSI_TASK_FREE
);
564 spin_lock_bh(&conn
->taskqueuelock
);
565 if (!list_empty(&task
->running
)) {
566 pr_debug_once("%s while task on list", __func__
);
567 list_del_init(&task
->running
);
569 spin_unlock_bh(&conn
->taskqueuelock
);
571 if (conn
->task
== task
)
574 if (conn
->ping_task
== task
)
575 conn
->ping_task
= NULL
;
577 /* release get from queueing */
578 __iscsi_put_task(task
);
582 * iscsi_complete_scsi_task - finish scsi task normally
583 * @task: iscsi task for scsi cmd
584 * @exp_cmdsn: expected cmd sn in cpu format
585 * @max_cmdsn: max cmd sn in cpu format
587 * This is used when drivers do not need or cannot perform
588 * lower level pdu processing.
590 * Called with session back_lock
592 void iscsi_complete_scsi_task(struct iscsi_task
*task
,
593 uint32_t exp_cmdsn
, uint32_t max_cmdsn
)
595 struct iscsi_conn
*conn
= task
->conn
;
597 ISCSI_DBG_SESSION(conn
->session
, "[itt 0x%x]\n", task
->itt
);
599 conn
->last_recv
= jiffies
;
600 __iscsi_update_cmdsn(conn
->session
, exp_cmdsn
, max_cmdsn
);
601 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
603 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task
);
607 * session back_lock must be held and if not called for a task that is
608 * still pending or from the xmit thread, then xmit thread must
611 static void fail_scsi_task(struct iscsi_task
*task
, int err
)
613 struct iscsi_conn
*conn
= task
->conn
;
614 struct scsi_cmnd
*sc
;
618 * if a command completes and we get a successful tmf response
619 * we will hit this because the scsi eh abort code does not take
626 if (task
->state
== ISCSI_TASK_PENDING
) {
628 * cmd never made it to the xmit thread, so we should not count
629 * the cmd in the sequencing
631 conn
->session
->queued_cmdsn
--;
632 /* it was never sent so just complete like normal */
633 state
= ISCSI_TASK_COMPLETED
;
634 } else if (err
== DID_TRANSPORT_DISRUPTED
)
635 state
= ISCSI_TASK_ABRT_SESS_RECOV
;
637 state
= ISCSI_TASK_ABRT_TMF
;
639 sc
->result
= err
<< 16;
640 if (!scsi_bidi_cmnd(sc
))
641 scsi_set_resid(sc
, scsi_bufflen(sc
));
643 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
644 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
647 /* regular RX path uses back_lock */
648 spin_lock_bh(&conn
->session
->back_lock
);
649 iscsi_complete_task(task
, state
);
650 spin_unlock_bh(&conn
->session
->back_lock
);
653 static int iscsi_prep_mgmt_task(struct iscsi_conn
*conn
,
654 struct iscsi_task
*task
)
656 struct iscsi_session
*session
= conn
->session
;
657 struct iscsi_hdr
*hdr
= task
->hdr
;
658 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
659 uint8_t opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
;
661 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
664 if (opcode
!= ISCSI_OP_LOGIN
&& opcode
!= ISCSI_OP_TEXT
)
665 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
667 * pre-format CmdSN for outgoing PDU.
669 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
670 if (hdr
->itt
!= RESERVED_ITT
) {
672 * TODO: We always use immediate for normal session pdus.
673 * If we start to send tmfs or nops as non-immediate then
674 * we should start checking the cmdsn numbers for mgmt tasks.
676 * During discovery sessions iscsid sends TEXT as non immediate,
677 * but we always only send one PDU at a time.
679 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
680 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
681 session
->queued_cmdsn
++;
686 if (session
->tt
->init_task
&& session
->tt
->init_task(task
))
689 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
)
690 session
->state
= ISCSI_STATE_LOGGING_OUT
;
692 task
->state
= ISCSI_TASK_RUNNING
;
693 ISCSI_DBG_SESSION(session
, "mgmtpdu [op 0x%x hdr->itt 0x%x "
694 "datalen %d]\n", hdr
->opcode
& ISCSI_OPCODE_MASK
,
695 hdr
->itt
, task
->data_count
);
699 static struct iscsi_task
*
700 __iscsi_conn_send_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
701 char *data
, uint32_t data_size
)
703 struct iscsi_session
*session
= conn
->session
;
704 struct iscsi_host
*ihost
= shost_priv(session
->host
);
705 uint8_t opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
;
706 struct iscsi_task
*task
;
709 if (session
->state
== ISCSI_STATE_TERMINATE
)
712 if (opcode
== ISCSI_OP_LOGIN
|| opcode
== ISCSI_OP_TEXT
) {
714 * Login and Text are sent serially, in
715 * request-followed-by-response sequence.
716 * Same task can be used. Same ITT must be used.
717 * Note that login_task is preallocated at conn_create().
719 if (conn
->login_task
->state
!= ISCSI_TASK_FREE
) {
720 iscsi_conn_printk(KERN_ERR
, conn
, "Login/Text in "
721 "progress. Cannot start new task.\n");
725 if (data_size
> ISCSI_DEF_MAX_RECV_SEG_LEN
) {
726 iscsi_conn_printk(KERN_ERR
, conn
, "Invalid buffer len of %u for login task. Max len is %u\n", data_size
, ISCSI_DEF_MAX_RECV_SEG_LEN
);
730 task
= conn
->login_task
;
732 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
735 if (data_size
!= 0) {
736 iscsi_conn_printk(KERN_ERR
, conn
, "Can not send data buffer of len %u for op 0x%x\n", data_size
, opcode
);
740 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
741 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
743 if (!kfifo_out(&session
->cmdpool
.queue
,
744 (void*)&task
, sizeof(void*)))
748 * released in complete pdu for task we expect a response for, and
749 * released by the lld when it has transmitted the task for
750 * pdus we do not expect a response for.
752 refcount_set(&task
->refcount
, 1);
755 INIT_LIST_HEAD(&task
->running
);
756 task
->state
= ISCSI_TASK_PENDING
;
759 memcpy(task
->data
, data
, data_size
);
760 task
->data_count
= data_size
;
762 task
->data_count
= 0;
764 if (conn
->session
->tt
->alloc_pdu
) {
765 if (conn
->session
->tt
->alloc_pdu(task
, hdr
->opcode
)) {
766 iscsi_conn_printk(KERN_ERR
, conn
, "Could not allocate "
767 "pdu for mgmt task.\n");
772 itt
= task
->hdr
->itt
;
773 task
->hdr_len
= sizeof(struct iscsi_hdr
);
774 memcpy(task
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
776 if (hdr
->itt
!= RESERVED_ITT
) {
777 if (session
->tt
->parse_pdu_itt
)
778 task
->hdr
->itt
= itt
;
780 task
->hdr
->itt
= build_itt(task
->itt
,
781 task
->conn
->session
->age
);
785 if (iscsi_prep_mgmt_task(conn
, task
))
788 if (session
->tt
->xmit_task(task
))
791 spin_lock_bh(&conn
->taskqueuelock
);
792 list_add_tail(&task
->running
, &conn
->mgmtqueue
);
793 spin_unlock_bh(&conn
->taskqueuelock
);
794 iscsi_conn_queue_work(conn
);
800 /* regular RX path uses back_lock */
801 spin_lock(&session
->back_lock
);
802 __iscsi_put_task(task
);
803 spin_unlock(&session
->back_lock
);
807 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
808 char *data
, uint32_t data_size
)
810 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
811 struct iscsi_session
*session
= conn
->session
;
814 spin_lock_bh(&session
->frwd_lock
);
815 if (!__iscsi_conn_send_pdu(conn
, hdr
, data
, data_size
))
817 spin_unlock_bh(&session
->frwd_lock
);
820 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
823 * iscsi_cmd_rsp - SCSI Command Response processing
824 * @conn: iscsi connection
826 * @task: scsi command task
827 * @data: cmd data buffer
828 * @datalen: len of buffer
830 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
831 * then completes the command and task.
833 static void iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
834 struct iscsi_task
*task
, char *data
,
837 struct iscsi_scsi_rsp
*rhdr
= (struct iscsi_scsi_rsp
*)hdr
;
838 struct iscsi_session
*session
= conn
->session
;
839 struct scsi_cmnd
*sc
= task
->sc
;
841 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
842 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
844 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
846 if (task
->protected) {
851 * Transports that didn't implement check_protection
852 * callback but still published T10-PI support to scsi-mid
853 * deserve this BUG_ON.
855 BUG_ON(!session
->tt
->check_protection
);
857 ascq
= session
->tt
->check_protection(task
, §or
);
859 sc
->result
= DRIVER_SENSE
<< 24 |
860 SAM_STAT_CHECK_CONDITION
;
861 scsi_build_sense_buffer(1, sc
->sense_buffer
,
862 ILLEGAL_REQUEST
, 0x10, ascq
);
863 scsi_set_sense_information(sc
->sense_buffer
,
864 SCSI_SENSE_BUFFERSIZE
,
870 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
871 sc
->result
= DID_ERROR
<< 16;
875 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
880 iscsi_conn_printk(KERN_ERR
, conn
,
881 "Got CHECK_CONDITION but invalid data "
882 "buffer size of %d\n", datalen
);
883 sc
->result
= DID_BAD_TARGET
<< 16;
887 senselen
= get_unaligned_be16(data
);
888 if (datalen
< senselen
)
889 goto invalid_datalen
;
891 memcpy(sc
->sense_buffer
, data
+ 2,
892 min_t(uint16_t, senselen
, SCSI_SENSE_BUFFERSIZE
));
893 ISCSI_DBG_SESSION(session
, "copied %d bytes of sense\n",
894 min_t(uint16_t, senselen
,
895 SCSI_SENSE_BUFFERSIZE
));
898 if (rhdr
->flags
& (ISCSI_FLAG_CMD_BIDI_UNDERFLOW
|
899 ISCSI_FLAG_CMD_BIDI_OVERFLOW
)) {
900 int res_count
= be32_to_cpu(rhdr
->bi_residual_count
);
902 if (scsi_bidi_cmnd(sc
) && res_count
> 0 &&
903 (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_OVERFLOW
||
904 res_count
<= scsi_in(sc
)->length
))
905 scsi_in(sc
)->resid
= res_count
;
907 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
910 if (rhdr
->flags
& (ISCSI_FLAG_CMD_UNDERFLOW
|
911 ISCSI_FLAG_CMD_OVERFLOW
)) {
912 int res_count
= be32_to_cpu(rhdr
->residual_count
);
915 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
916 res_count
<= scsi_bufflen(sc
)))
917 /* write side for bidi or uni-io set_resid */
918 scsi_set_resid(sc
, res_count
);
920 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
923 ISCSI_DBG_SESSION(session
, "cmd rsp done [sc %p res %d itt 0x%x]\n",
924 sc
, sc
->result
, task
->itt
);
925 conn
->scsirsp_pdus_cnt
++;
926 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
930 * iscsi_data_in_rsp - SCSI Data-In Response processing
931 * @conn: iscsi connection
933 * @task: scsi command task
936 iscsi_data_in_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
937 struct iscsi_task
*task
)
939 struct iscsi_data_rsp
*rhdr
= (struct iscsi_data_rsp
*)hdr
;
940 struct scsi_cmnd
*sc
= task
->sc
;
942 if (!(rhdr
->flags
& ISCSI_FLAG_DATA_STATUS
))
945 iscsi_update_cmdsn(conn
->session
, (struct iscsi_nopin
*)hdr
);
946 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
947 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
948 if (rhdr
->flags
& (ISCSI_FLAG_DATA_UNDERFLOW
|
949 ISCSI_FLAG_DATA_OVERFLOW
)) {
950 int res_count
= be32_to_cpu(rhdr
->residual_count
);
953 (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
||
954 res_count
<= scsi_in(sc
)->length
))
955 scsi_in(sc
)->resid
= res_count
;
957 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
960 ISCSI_DBG_SESSION(conn
->session
, "data in with status done "
961 "[sc %p res %d itt 0x%x]\n",
962 sc
, sc
->result
, task
->itt
);
963 conn
->scsirsp_pdus_cnt
++;
964 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
967 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
969 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
971 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
972 conn
->tmfrsp_pdus_cnt
++;
974 if (conn
->tmf_state
!= TMF_QUEUED
)
977 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
978 conn
->tmf_state
= TMF_SUCCESS
;
979 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
980 conn
->tmf_state
= TMF_NOT_FOUND
;
982 conn
->tmf_state
= TMF_FAILED
;
983 wake_up(&conn
->ehwait
);
986 static int iscsi_send_nopout(struct iscsi_conn
*conn
, struct iscsi_nopin
*rhdr
)
988 struct iscsi_nopout hdr
;
989 struct iscsi_task
*task
;
991 if (!rhdr
&& conn
->ping_task
)
994 memset(&hdr
, 0, sizeof(struct iscsi_nopout
));
995 hdr
.opcode
= ISCSI_OP_NOOP_OUT
| ISCSI_OP_IMMEDIATE
;
996 hdr
.flags
= ISCSI_FLAG_CMD_FINAL
;
1000 hdr
.ttt
= rhdr
->ttt
;
1001 hdr
.itt
= RESERVED_ITT
;
1003 hdr
.ttt
= RESERVED_ITT
;
1005 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)&hdr
, NULL
, 0);
1007 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send nopout\n");
1010 /* only track our nops */
1011 conn
->ping_task
= task
;
1012 conn
->last_ping
= jiffies
;
1018 static int iscsi_nop_out_rsp(struct iscsi_task
*task
,
1019 struct iscsi_nopin
*nop
, char *data
, int datalen
)
1021 struct iscsi_conn
*conn
= task
->conn
;
1024 if (conn
->ping_task
!= task
) {
1026 * If this is not in response to one of our
1027 * nops then it must be from userspace.
1029 if (iscsi_recv_pdu(conn
->cls_conn
, (struct iscsi_hdr
*)nop
,
1031 rc
= ISCSI_ERR_CONN_FAILED
;
1033 mod_timer(&conn
->transport_timer
, jiffies
+ conn
->recv_timeout
);
1034 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
1038 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
1039 char *data
, int datalen
)
1041 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
1042 struct iscsi_hdr rejected_pdu
;
1045 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
1047 if (ntoh24(reject
->dlength
) > datalen
||
1048 ntoh24(reject
->dlength
) < sizeof(struct iscsi_hdr
)) {
1049 iscsi_conn_printk(KERN_ERR
, conn
, "Cannot handle rejected "
1050 "pdu. Invalid data length (pdu dlength "
1051 "%u, datalen %d\n", ntoh24(reject
->dlength
),
1053 return ISCSI_ERR_PROTO
;
1055 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
1056 opcode
= rejected_pdu
.opcode
& ISCSI_OPCODE_MASK
;
1058 switch (reject
->reason
) {
1059 case ISCSI_REASON_DATA_DIGEST_ERROR
:
1060 iscsi_conn_printk(KERN_ERR
, conn
,
1061 "pdu (op 0x%x itt 0x%x) rejected "
1062 "due to DataDigest error.\n",
1063 opcode
, rejected_pdu
.itt
);
1065 case ISCSI_REASON_IMM_CMD_REJECT
:
1066 iscsi_conn_printk(KERN_ERR
, conn
,
1067 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1068 "immediate commands.\n",
1069 opcode
, rejected_pdu
.itt
);
1071 * We only send one TMF at a time so if the target could not
1072 * handle it, then it should get fixed (RFC mandates that
1073 * a target can handle one immediate TMF per conn).
1075 * For nops-outs, we could have sent more than one if
1076 * the target is sending us lots of nop-ins
1078 if (opcode
!= ISCSI_OP_NOOP_OUT
)
1081 if (rejected_pdu
.itt
== cpu_to_be32(ISCSI_RESERVED_TAG
)) {
1083 * nop-out in response to target's nop-out rejected.
1086 /* In RX path we are under back lock */
1087 spin_unlock(&conn
->session
->back_lock
);
1088 spin_lock(&conn
->session
->frwd_lock
);
1089 iscsi_send_nopout(conn
,
1090 (struct iscsi_nopin
*)&rejected_pdu
);
1091 spin_unlock(&conn
->session
->frwd_lock
);
1092 spin_lock(&conn
->session
->back_lock
);
1094 struct iscsi_task
*task
;
1096 * Our nop as ping got dropped. We know the target
1097 * and transport are ok so just clean up
1099 task
= iscsi_itt_to_task(conn
, rejected_pdu
.itt
);
1101 iscsi_conn_printk(KERN_ERR
, conn
,
1102 "Invalid pdu reject. Could "
1103 "not lookup rejected task.\n");
1104 rc
= ISCSI_ERR_BAD_ITT
;
1106 rc
= iscsi_nop_out_rsp(task
,
1107 (struct iscsi_nopin
*)&rejected_pdu
,
1112 iscsi_conn_printk(KERN_ERR
, conn
,
1113 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1114 "code 0x%x\n", rejected_pdu
.opcode
,
1115 rejected_pdu
.itt
, reject
->reason
);
1122 * iscsi_itt_to_task - look up task by itt
1123 * @conn: iscsi connection
1126 * This should be used for mgmt tasks like login and nops, or if
1127 * the LDD's itt space does not include the session age.
1129 * The session back_lock must be held.
1131 struct iscsi_task
*iscsi_itt_to_task(struct iscsi_conn
*conn
, itt_t itt
)
1133 struct iscsi_session
*session
= conn
->session
;
1136 if (itt
== RESERVED_ITT
)
1139 if (session
->tt
->parse_pdu_itt
)
1140 session
->tt
->parse_pdu_itt(conn
, itt
, &i
, NULL
);
1143 if (i
>= session
->cmds_max
)
1146 return session
->cmds
[i
];
1148 EXPORT_SYMBOL_GPL(iscsi_itt_to_task
);
1151 * __iscsi_complete_pdu - complete pdu
1153 * @hdr: iscsi header
1154 * @data: data buffer
1155 * @datalen: len of data buffer
1157 * Completes pdu processing by freeing any resources allocated at
1158 * queuecommand or send generic. session back_lock must be held and verify
1159 * itt must have been called.
1161 int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
1162 char *data
, int datalen
)
1164 struct iscsi_session
*session
= conn
->session
;
1165 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
1166 struct iscsi_task
*task
;
1169 conn
->last_recv
= jiffies
;
1170 rc
= iscsi_verify_itt(conn
, hdr
->itt
);
1174 if (hdr
->itt
!= RESERVED_ITT
)
1175 itt
= get_itt(hdr
->itt
);
1179 ISCSI_DBG_SESSION(session
, "[op 0x%x cid %d itt 0x%x len %d]\n",
1180 opcode
, conn
->id
, itt
, datalen
);
1183 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1186 case ISCSI_OP_NOOP_IN
:
1188 rc
= ISCSI_ERR_PROTO
;
1192 if (hdr
->ttt
== cpu_to_be32(ISCSI_RESERVED_TAG
))
1195 /* In RX path we are under back lock */
1196 spin_unlock(&session
->back_lock
);
1197 spin_lock(&session
->frwd_lock
);
1198 iscsi_send_nopout(conn
, (struct iscsi_nopin
*)hdr
);
1199 spin_unlock(&session
->frwd_lock
);
1200 spin_lock(&session
->back_lock
);
1202 case ISCSI_OP_REJECT
:
1203 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
1205 case ISCSI_OP_ASYNC_EVENT
:
1206 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
1207 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
1208 rc
= ISCSI_ERR_CONN_FAILED
;
1211 rc
= ISCSI_ERR_BAD_OPCODE
;
1218 case ISCSI_OP_SCSI_CMD_RSP
:
1219 case ISCSI_OP_SCSI_DATA_IN
:
1220 task
= iscsi_itt_to_ctask(conn
, hdr
->itt
);
1222 return ISCSI_ERR_BAD_ITT
;
1223 task
->last_xfer
= jiffies
;
1227 * LLD handles R2Ts if they need to.
1230 case ISCSI_OP_LOGOUT_RSP
:
1231 case ISCSI_OP_LOGIN_RSP
:
1232 case ISCSI_OP_TEXT_RSP
:
1233 case ISCSI_OP_SCSI_TMFUNC_RSP
:
1234 case ISCSI_OP_NOOP_IN
:
1235 task
= iscsi_itt_to_task(conn
, hdr
->itt
);
1237 return ISCSI_ERR_BAD_ITT
;
1240 return ISCSI_ERR_BAD_OPCODE
;
1244 case ISCSI_OP_SCSI_CMD_RSP
:
1245 iscsi_scsi_cmd_rsp(conn
, hdr
, task
, data
, datalen
);
1247 case ISCSI_OP_SCSI_DATA_IN
:
1248 iscsi_data_in_rsp(conn
, hdr
, task
);
1250 case ISCSI_OP_LOGOUT_RSP
:
1251 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1253 rc
= ISCSI_ERR_PROTO
;
1256 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
1258 case ISCSI_OP_LOGIN_RSP
:
1259 case ISCSI_OP_TEXT_RSP
:
1260 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1262 * login related PDU's exp_statsn is handled in
1266 case ISCSI_OP_SCSI_TMFUNC_RSP
:
1267 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1269 rc
= ISCSI_ERR_PROTO
;
1273 iscsi_tmf_rsp(conn
, hdr
);
1274 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
1276 case ISCSI_OP_NOOP_IN
:
1277 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)hdr
);
1278 if (hdr
->ttt
!= cpu_to_be32(ISCSI_RESERVED_TAG
) || datalen
) {
1279 rc
= ISCSI_ERR_PROTO
;
1282 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
1284 rc
= iscsi_nop_out_rsp(task
, (struct iscsi_nopin
*)hdr
,
1288 rc
= ISCSI_ERR_BAD_OPCODE
;
1295 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
1296 rc
= ISCSI_ERR_CONN_FAILED
;
1297 iscsi_complete_task(task
, ISCSI_TASK_COMPLETED
);
1300 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu
);
1302 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
1303 char *data
, int datalen
)
1307 spin_lock(&conn
->session
->back_lock
);
1308 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
1309 spin_unlock(&conn
->session
->back_lock
);
1312 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
1314 int iscsi_verify_itt(struct iscsi_conn
*conn
, itt_t itt
)
1316 struct iscsi_session
*session
= conn
->session
;
1319 if (itt
== RESERVED_ITT
)
1322 if (session
->tt
->parse_pdu_itt
)
1323 session
->tt
->parse_pdu_itt(conn
, itt
, &i
, &age
);
1326 age
= ((__force u32
)itt
>> ISCSI_AGE_SHIFT
) & ISCSI_AGE_MASK
;
1329 if (age
!= session
->age
) {
1330 iscsi_conn_printk(KERN_ERR
, conn
,
1331 "received itt %x expected session age (%x)\n",
1332 (__force u32
)itt
, session
->age
);
1333 return ISCSI_ERR_BAD_ITT
;
1336 if (i
>= session
->cmds_max
) {
1337 iscsi_conn_printk(KERN_ERR
, conn
,
1338 "received invalid itt index %u (max cmds "
1339 "%u.\n", i
, session
->cmds_max
);
1340 return ISCSI_ERR_BAD_ITT
;
1344 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
1347 * iscsi_itt_to_ctask - look up ctask by itt
1348 * @conn: iscsi connection
1351 * This should be used for cmd tasks.
1353 * The session back_lock must be held.
1355 struct iscsi_task
*iscsi_itt_to_ctask(struct iscsi_conn
*conn
, itt_t itt
)
1357 struct iscsi_task
*task
;
1359 if (iscsi_verify_itt(conn
, itt
))
1362 task
= iscsi_itt_to_task(conn
, itt
);
1363 if (!task
|| !task
->sc
)
1366 if (task
->sc
->SCp
.phase
!= conn
->session
->age
) {
1367 iscsi_session_printk(KERN_ERR
, conn
->session
,
1368 "task's session age %d, expected %d\n",
1369 task
->sc
->SCp
.phase
, conn
->session
->age
);
1375 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask
);
1377 void iscsi_session_failure(struct iscsi_session
*session
,
1380 struct iscsi_conn
*conn
;
1383 spin_lock_bh(&session
->frwd_lock
);
1384 conn
= session
->leadconn
;
1385 if (session
->state
== ISCSI_STATE_TERMINATE
|| !conn
) {
1386 spin_unlock_bh(&session
->frwd_lock
);
1390 dev
= get_device(&conn
->cls_conn
->dev
);
1391 spin_unlock_bh(&session
->frwd_lock
);
1395 * if the host is being removed bypass the connection
1396 * recovery initialization because we are going to kill
1399 if (err
== ISCSI_ERR_INVALID_HOST
)
1400 iscsi_conn_error_event(conn
->cls_conn
, err
);
1402 iscsi_conn_failure(conn
, err
);
1405 EXPORT_SYMBOL_GPL(iscsi_session_failure
);
1407 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
1409 struct iscsi_session
*session
= conn
->session
;
1411 spin_lock_bh(&session
->frwd_lock
);
1412 if (session
->state
== ISCSI_STATE_FAILED
) {
1413 spin_unlock_bh(&session
->frwd_lock
);
1417 if (conn
->stop_stage
== 0)
1418 session
->state
= ISCSI_STATE_FAILED
;
1419 spin_unlock_bh(&session
->frwd_lock
);
1421 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1422 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1423 iscsi_conn_error_event(conn
->cls_conn
, err
);
1425 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
1427 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn
*conn
)
1429 struct iscsi_session
*session
= conn
->session
;
1432 * Check for iSCSI window and take care of CmdSN wrap-around
1434 if (!iscsi_sna_lte(session
->queued_cmdsn
, session
->max_cmdsn
)) {
1435 ISCSI_DBG_SESSION(session
, "iSCSI CmdSN closed. ExpCmdSn "
1436 "%u MaxCmdSN %u CmdSN %u/%u\n",
1437 session
->exp_cmdsn
, session
->max_cmdsn
,
1438 session
->cmdsn
, session
->queued_cmdsn
);
1444 static int iscsi_xmit_task(struct iscsi_conn
*conn
)
1446 struct iscsi_task
*task
= conn
->task
;
1449 if (test_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
))
1452 spin_lock_bh(&conn
->session
->back_lock
);
1453 if (conn
->task
== NULL
) {
1454 spin_unlock_bh(&conn
->session
->back_lock
);
1457 __iscsi_get_task(task
);
1458 spin_unlock_bh(&conn
->session
->back_lock
);
1459 spin_unlock_bh(&conn
->session
->frwd_lock
);
1460 rc
= conn
->session
->tt
->xmit_task(task
);
1461 spin_lock_bh(&conn
->session
->frwd_lock
);
1463 /* done with this task */
1464 task
->last_xfer
= jiffies
;
1467 /* regular RX path uses back_lock */
1468 spin_lock(&conn
->session
->back_lock
);
1469 __iscsi_put_task(task
);
1470 spin_unlock(&conn
->session
->back_lock
);
1475 * iscsi_requeue_task - requeue task to run from session workqueue
1476 * @task: task to requeue
1478 * LLDs that need to run a task from the session workqueue should call
1479 * this. The session frwd_lock must be held. This should only be called
1480 * by software drivers.
1482 void iscsi_requeue_task(struct iscsi_task
*task
)
1484 struct iscsi_conn
*conn
= task
->conn
;
1487 * this may be on the requeue list already if the xmit_task callout
1488 * is handling the r2ts while we are adding new ones
1490 spin_lock_bh(&conn
->taskqueuelock
);
1491 if (list_empty(&task
->running
))
1492 list_add_tail(&task
->running
, &conn
->requeue
);
1493 spin_unlock_bh(&conn
->taskqueuelock
);
1494 iscsi_conn_queue_work(conn
);
1496 EXPORT_SYMBOL_GPL(iscsi_requeue_task
);
1499 * iscsi_data_xmit - xmit any command into the scheduled connection
1500 * @conn: iscsi connection
1503 * The function can return -EAGAIN in which case the caller must
1504 * re-schedule it again later or recover. '0' return code means
1507 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
1509 struct iscsi_task
*task
;
1512 spin_lock_bh(&conn
->session
->frwd_lock
);
1513 if (test_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
)) {
1514 ISCSI_DBG_SESSION(conn
->session
, "Tx suspended!\n");
1515 spin_unlock_bh(&conn
->session
->frwd_lock
);
1520 rc
= iscsi_xmit_task(conn
);
1526 * process mgmt pdus like nops before commands since we should
1527 * only have one nop-out as a ping from us and targets should not
1528 * overflow us with nop-ins
1530 spin_lock_bh(&conn
->taskqueuelock
);
1532 while (!list_empty(&conn
->mgmtqueue
)) {
1533 conn
->task
= list_entry(conn
->mgmtqueue
.next
,
1534 struct iscsi_task
, running
);
1535 list_del_init(&conn
->task
->running
);
1536 spin_unlock_bh(&conn
->taskqueuelock
);
1537 if (iscsi_prep_mgmt_task(conn
, conn
->task
)) {
1538 /* regular RX path uses back_lock */
1539 spin_lock_bh(&conn
->session
->back_lock
);
1540 __iscsi_put_task(conn
->task
);
1541 spin_unlock_bh(&conn
->session
->back_lock
);
1543 spin_lock_bh(&conn
->taskqueuelock
);
1546 rc
= iscsi_xmit_task(conn
);
1549 spin_lock_bh(&conn
->taskqueuelock
);
1552 /* process pending command queue */
1553 while (!list_empty(&conn
->cmdqueue
)) {
1554 conn
->task
= list_entry(conn
->cmdqueue
.next
, struct iscsi_task
,
1556 list_del_init(&conn
->task
->running
);
1557 spin_unlock_bh(&conn
->taskqueuelock
);
1558 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
) {
1559 fail_scsi_task(conn
->task
, DID_IMM_RETRY
);
1560 spin_lock_bh(&conn
->taskqueuelock
);
1563 rc
= iscsi_prep_scsi_cmd_pdu(conn
->task
);
1565 if (rc
== -ENOMEM
|| rc
== -EACCES
) {
1566 spin_lock_bh(&conn
->taskqueuelock
);
1567 list_add_tail(&conn
->task
->running
,
1570 spin_unlock_bh(&conn
->taskqueuelock
);
1573 fail_scsi_task(conn
->task
, DID_ABORT
);
1574 spin_lock_bh(&conn
->taskqueuelock
);
1577 rc
= iscsi_xmit_task(conn
);
1581 * we could continuously get new task requests so
1582 * we need to check the mgmt queue for nops that need to
1583 * be sent to aviod starvation
1585 spin_lock_bh(&conn
->taskqueuelock
);
1586 if (!list_empty(&conn
->mgmtqueue
))
1590 while (!list_empty(&conn
->requeue
)) {
1592 * we always do fastlogout - conn stop code will clean up.
1594 if (conn
->session
->state
== ISCSI_STATE_LOGGING_OUT
)
1597 task
= list_entry(conn
->requeue
.next
, struct iscsi_task
,
1599 if (iscsi_check_tmf_restrictions(task
, ISCSI_OP_SCSI_DATA_OUT
))
1603 list_del_init(&conn
->task
->running
);
1604 conn
->task
->state
= ISCSI_TASK_RUNNING
;
1605 spin_unlock_bh(&conn
->taskqueuelock
);
1606 rc
= iscsi_xmit_task(conn
);
1609 spin_lock_bh(&conn
->taskqueuelock
);
1610 if (!list_empty(&conn
->mgmtqueue
))
1613 spin_unlock_bh(&conn
->taskqueuelock
);
1614 spin_unlock_bh(&conn
->session
->frwd_lock
);
1618 spin_unlock_bh(&conn
->session
->frwd_lock
);
1622 static void iscsi_xmitworker(struct work_struct
*work
)
1624 struct iscsi_conn
*conn
=
1625 container_of(work
, struct iscsi_conn
, xmitwork
);
1628 * serialize Xmit worker on a per-connection basis.
1631 rc
= iscsi_data_xmit(conn
);
1632 } while (rc
>= 0 || rc
== -EAGAIN
);
1635 static inline struct iscsi_task
*iscsi_alloc_task(struct iscsi_conn
*conn
,
1636 struct scsi_cmnd
*sc
)
1638 struct iscsi_task
*task
;
1640 if (!kfifo_out(&conn
->session
->cmdpool
.queue
,
1641 (void *) &task
, sizeof(void *)))
1644 sc
->SCp
.phase
= conn
->session
->age
;
1645 sc
->SCp
.ptr
= (char *) task
;
1647 refcount_set(&task
->refcount
, 1);
1648 task
->state
= ISCSI_TASK_PENDING
;
1651 task
->have_checked_conn
= false;
1652 task
->last_timeout
= jiffies
;
1653 task
->last_xfer
= jiffies
;
1654 task
->protected = false;
1655 INIT_LIST_HEAD(&task
->running
);
1660 FAILURE_BAD_HOST
= 1,
1661 FAILURE_SESSION_FAILED
,
1662 FAILURE_SESSION_FREED
,
1663 FAILURE_WINDOW_CLOSED
,
1665 FAILURE_SESSION_TERMINATE
,
1666 FAILURE_SESSION_IN_RECOVERY
,
1667 FAILURE_SESSION_RECOVERY_TIMEOUT
,
1668 FAILURE_SESSION_LOGGING_OUT
,
1669 FAILURE_SESSION_NOT_READY
,
1672 int iscsi_queuecommand(struct Scsi_Host
*host
, struct scsi_cmnd
*sc
)
1674 struct iscsi_cls_session
*cls_session
;
1675 struct iscsi_host
*ihost
;
1677 struct iscsi_session
*session
;
1678 struct iscsi_conn
*conn
;
1679 struct iscsi_task
*task
= NULL
;
1684 ihost
= shost_priv(host
);
1686 cls_session
= starget_to_session(scsi_target(sc
->device
));
1687 session
= cls_session
->dd_data
;
1688 spin_lock_bh(&session
->frwd_lock
);
1690 reason
= iscsi_session_chkready(cls_session
);
1692 sc
->result
= reason
;
1696 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1698 * to handle the race between when we set the recovery state
1699 * and block the session we requeue here (commands could
1700 * be entering our queuecommand while a block is starting
1701 * up because the block code is not locked)
1703 switch (session
->state
) {
1704 case ISCSI_STATE_FAILED
:
1706 * cmds should fail during shutdown, if the session
1707 * state is bad, allowing completion to happen
1709 if (unlikely(system_state
!= SYSTEM_RUNNING
)) {
1710 reason
= FAILURE_SESSION_FAILED
;
1711 sc
->result
= DID_NO_CONNECT
<< 16;
1714 case ISCSI_STATE_IN_RECOVERY
:
1715 reason
= FAILURE_SESSION_IN_RECOVERY
;
1716 sc
->result
= DID_IMM_RETRY
<< 16;
1718 case ISCSI_STATE_LOGGING_OUT
:
1719 reason
= FAILURE_SESSION_LOGGING_OUT
;
1720 sc
->result
= DID_IMM_RETRY
<< 16;
1722 case ISCSI_STATE_RECOVERY_FAILED
:
1723 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
1724 sc
->result
= DID_TRANSPORT_FAILFAST
<< 16;
1726 case ISCSI_STATE_TERMINATE
:
1727 reason
= FAILURE_SESSION_TERMINATE
;
1728 sc
->result
= DID_NO_CONNECT
<< 16;
1731 reason
= FAILURE_SESSION_FREED
;
1732 sc
->result
= DID_NO_CONNECT
<< 16;
1737 conn
= session
->leadconn
;
1739 reason
= FAILURE_SESSION_FREED
;
1740 sc
->result
= DID_NO_CONNECT
<< 16;
1744 if (test_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
)) {
1745 reason
= FAILURE_SESSION_IN_RECOVERY
;
1746 sc
->result
= DID_REQUEUE
<< 16;
1750 if (iscsi_check_cmdsn_window_closed(conn
)) {
1751 reason
= FAILURE_WINDOW_CLOSED
;
1755 task
= iscsi_alloc_task(conn
, sc
);
1757 reason
= FAILURE_OOM
;
1761 if (!ihost
->workq
) {
1762 reason
= iscsi_prep_scsi_cmd_pdu(task
);
1764 if (reason
== -ENOMEM
|| reason
== -EACCES
) {
1765 reason
= FAILURE_OOM
;
1768 sc
->result
= DID_ABORT
<< 16;
1772 if (session
->tt
->xmit_task(task
)) {
1774 reason
= FAILURE_SESSION_NOT_READY
;
1778 spin_lock_bh(&conn
->taskqueuelock
);
1779 list_add_tail(&task
->running
, &conn
->cmdqueue
);
1780 spin_unlock_bh(&conn
->taskqueuelock
);
1781 iscsi_conn_queue_work(conn
);
1784 session
->queued_cmdsn
++;
1785 spin_unlock_bh(&session
->frwd_lock
);
1789 iscsi_complete_task(task
, ISCSI_TASK_REQUEUE_SCSIQ
);
1791 spin_unlock_bh(&session
->frwd_lock
);
1792 ISCSI_DBG_SESSION(session
, "cmd 0x%x rejected (%d)\n",
1793 sc
->cmnd
[0], reason
);
1794 return SCSI_MLQUEUE_TARGET_BUSY
;
1797 iscsi_complete_task(task
, ISCSI_TASK_REQUEUE_SCSIQ
);
1799 spin_unlock_bh(&session
->frwd_lock
);
1800 ISCSI_DBG_SESSION(session
, "iscsi: cmd 0x%x is not queued (%d)\n",
1801 sc
->cmnd
[0], reason
);
1802 if (!scsi_bidi_cmnd(sc
))
1803 scsi_set_resid(sc
, scsi_bufflen(sc
));
1805 scsi_out(sc
)->resid
= scsi_out(sc
)->length
;
1806 scsi_in(sc
)->resid
= scsi_in(sc
)->length
;
1811 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
1813 int iscsi_target_alloc(struct scsi_target
*starget
)
1815 struct iscsi_cls_session
*cls_session
= starget_to_session(starget
);
1816 struct iscsi_session
*session
= cls_session
->dd_data
;
1818 starget
->can_queue
= session
->scsi_cmds_max
;
1821 EXPORT_SYMBOL_GPL(iscsi_target_alloc
);
1823 static void iscsi_tmf_timedout(struct timer_list
*t
)
1825 struct iscsi_conn
*conn
= from_timer(conn
, t
, tmf_timer
);
1826 struct iscsi_session
*session
= conn
->session
;
1828 spin_lock(&session
->frwd_lock
);
1829 if (conn
->tmf_state
== TMF_QUEUED
) {
1830 conn
->tmf_state
= TMF_TIMEDOUT
;
1831 ISCSI_DBG_EH(session
, "tmf timedout\n");
1832 /* unblock eh_abort() */
1833 wake_up(&conn
->ehwait
);
1835 spin_unlock(&session
->frwd_lock
);
1838 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn
*conn
,
1839 struct iscsi_tm
*hdr
, int age
,
1842 struct iscsi_session
*session
= conn
->session
;
1843 struct iscsi_task
*task
;
1845 task
= __iscsi_conn_send_pdu(conn
, (struct iscsi_hdr
*)hdr
,
1848 spin_unlock_bh(&session
->frwd_lock
);
1849 iscsi_conn_printk(KERN_ERR
, conn
, "Could not send TMF.\n");
1850 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1851 spin_lock_bh(&session
->frwd_lock
);
1854 conn
->tmfcmd_pdus_cnt
++;
1855 conn
->tmf_timer
.expires
= timeout
* HZ
+ jiffies
;
1856 add_timer(&conn
->tmf_timer
);
1857 ISCSI_DBG_EH(session
, "tmf set timeout\n");
1859 spin_unlock_bh(&session
->frwd_lock
);
1860 mutex_unlock(&session
->eh_mutex
);
1863 * block eh thread until:
1867 * 3) session is terminated or restarted or userspace has
1868 * given up on recovery
1870 wait_event_interruptible(conn
->ehwait
, age
!= session
->age
||
1871 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1872 conn
->tmf_state
!= TMF_QUEUED
);
1873 if (signal_pending(current
))
1874 flush_signals(current
);
1875 del_timer_sync(&conn
->tmf_timer
);
1877 mutex_lock(&session
->eh_mutex
);
1878 spin_lock_bh(&session
->frwd_lock
);
1879 /* if the session drops it will clean up the task */
1880 if (age
!= session
->age
||
1881 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1887 * Fail commands. session lock held and recv side suspended and xmit
1890 static void fail_scsi_tasks(struct iscsi_conn
*conn
, u64 lun
, int error
)
1892 struct iscsi_task
*task
;
1895 for (i
= 0; i
< conn
->session
->cmds_max
; i
++) {
1896 task
= conn
->session
->cmds
[i
];
1897 if (!task
->sc
|| task
->state
== ISCSI_TASK_FREE
)
1900 if (lun
!= -1 && lun
!= task
->sc
->device
->lun
)
1903 ISCSI_DBG_SESSION(conn
->session
,
1904 "failing sc %p itt 0x%x state %d\n",
1905 task
->sc
, task
->itt
, task
->state
);
1906 fail_scsi_task(task
, error
);
1911 * iscsi_suspend_queue - suspend iscsi_queuecommand
1912 * @conn: iscsi conn to stop queueing IO on
1914 * This grabs the session frwd_lock to make sure no one is in
1915 * xmit_task/queuecommand, and then sets suspend to prevent
1916 * new commands from being queued. This only needs to be called
1917 * by offload drivers that need to sync a path like ep disconnect
1918 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1919 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1921 void iscsi_suspend_queue(struct iscsi_conn
*conn
)
1923 spin_lock_bh(&conn
->session
->frwd_lock
);
1924 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1925 spin_unlock_bh(&conn
->session
->frwd_lock
);
1927 EXPORT_SYMBOL_GPL(iscsi_suspend_queue
);
1930 * iscsi_suspend_tx - suspend iscsi_data_xmit
1931 * @conn: iscsi conn tp stop processing IO on.
1933 * This function sets the suspend bit to prevent iscsi_data_xmit
1934 * from sending new IO, and if work is queued on the xmit thread
1935 * it will wait for it to be completed.
1937 void iscsi_suspend_tx(struct iscsi_conn
*conn
)
1939 struct Scsi_Host
*shost
= conn
->session
->host
;
1940 struct iscsi_host
*ihost
= shost_priv(shost
);
1942 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1944 flush_workqueue(ihost
->workq
);
1946 EXPORT_SYMBOL_GPL(iscsi_suspend_tx
);
1948 static void iscsi_start_tx(struct iscsi_conn
*conn
)
1950 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1951 iscsi_conn_queue_work(conn
);
1955 * We want to make sure a ping is in flight. It has timed out.
1956 * And we are not busy processing a pdu that is making
1957 * progress but got started before the ping and is taking a while
1958 * to complete so the ping is just stuck behind it in a queue.
1960 static int iscsi_has_ping_timed_out(struct iscsi_conn
*conn
)
1962 if (conn
->ping_task
&&
1963 time_before_eq(conn
->last_recv
+ (conn
->recv_timeout
* HZ
) +
1964 (conn
->ping_timeout
* HZ
), jiffies
))
1970 enum blk_eh_timer_return
iscsi_eh_cmd_timed_out(struct scsi_cmnd
*sc
)
1972 enum blk_eh_timer_return rc
= BLK_EH_NOT_HANDLED
;
1973 struct iscsi_task
*task
= NULL
, *running_task
;
1974 struct iscsi_cls_session
*cls_session
;
1975 struct iscsi_session
*session
;
1976 struct iscsi_conn
*conn
;
1979 cls_session
= starget_to_session(scsi_target(sc
->device
));
1980 session
= cls_session
->dd_data
;
1982 ISCSI_DBG_EH(session
, "scsi cmd %p timedout\n", sc
);
1984 spin_lock(&session
->frwd_lock
);
1985 task
= (struct iscsi_task
*)sc
->SCp
.ptr
;
1988 * Raced with completion. Blk layer has taken ownership
1989 * so let timeout code complete it now.
1991 rc
= BLK_EH_HANDLED
;
1995 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
1997 * During shutdown, if session is prematurely disconnected,
1998 * recovery won't happen and there will be hung cmds. Not
1999 * handling cmds would trigger EH, also bad in this case.
2000 * Instead, handle cmd, allow completion to happen and let
2001 * upper layer to deal with the result.
2003 if (unlikely(system_state
!= SYSTEM_RUNNING
)) {
2004 sc
->result
= DID_NO_CONNECT
<< 16;
2005 ISCSI_DBG_EH(session
, "sc on shutdown, handled\n");
2006 rc
= BLK_EH_HANDLED
;
2010 * We are probably in the middle of iscsi recovery so let
2011 * that complete and handle the error.
2013 rc
= BLK_EH_RESET_TIMER
;
2017 conn
= session
->leadconn
;
2019 /* In the middle of shuting down */
2020 rc
= BLK_EH_RESET_TIMER
;
2025 * If we have sent (at least queued to the network layer) a pdu or
2026 * recvd one for the task since the last timeout ask for
2027 * more time. If on the next timeout we have not made progress
2028 * we can check if it is the task or connection when we send the
2031 if (time_after(task
->last_xfer
, task
->last_timeout
)) {
2032 ISCSI_DBG_EH(session
, "Command making progress. Asking "
2033 "scsi-ml for more time to complete. "
2034 "Last data xfer at %lu. Last timeout was at "
2035 "%lu\n.", task
->last_xfer
, task
->last_timeout
);
2036 task
->have_checked_conn
= false;
2037 rc
= BLK_EH_RESET_TIMER
;
2041 if (!conn
->recv_timeout
&& !conn
->ping_timeout
)
2044 * if the ping timedout then we are in the middle of cleaning up
2045 * and can let the iscsi eh handle it
2047 if (iscsi_has_ping_timed_out(conn
)) {
2048 rc
= BLK_EH_RESET_TIMER
;
2052 for (i
= 0; i
< conn
->session
->cmds_max
; i
++) {
2053 running_task
= conn
->session
->cmds
[i
];
2054 if (!running_task
->sc
|| running_task
== task
||
2055 running_task
->state
!= ISCSI_TASK_RUNNING
)
2059 * Only check if cmds started before this one have made
2060 * progress, or this could never fail
2062 if (time_after(running_task
->sc
->jiffies_at_alloc
,
2063 task
->sc
->jiffies_at_alloc
))
2066 if (time_after(running_task
->last_xfer
, task
->last_timeout
)) {
2068 * This task has not made progress, but a task
2069 * started before us has transferred data since
2070 * we started/last-checked. We could be queueing
2071 * too many tasks or the LU is bad.
2073 * If the device is bad the cmds ahead of us on
2074 * other devs will complete, and this loop will
2075 * eventually fail starting the scsi eh.
2077 ISCSI_DBG_EH(session
, "Command has not made progress "
2078 "but commands ahead of it have. "
2079 "Asking scsi-ml for more time to "
2080 "complete. Our last xfer vs running task "
2081 "last xfer %lu/%lu. Last check %lu.\n",
2082 task
->last_xfer
, running_task
->last_xfer
,
2083 task
->last_timeout
);
2084 rc
= BLK_EH_RESET_TIMER
;
2089 /* Assumes nop timeout is shorter than scsi cmd timeout */
2090 if (task
->have_checked_conn
)
2094 * Checking the transport already or nop from a cmd timeout still
2097 if (conn
->ping_task
) {
2098 task
->have_checked_conn
= true;
2099 rc
= BLK_EH_RESET_TIMER
;
2103 /* Make sure there is a transport check done */
2104 iscsi_send_nopout(conn
, NULL
);
2105 task
->have_checked_conn
= true;
2106 rc
= BLK_EH_RESET_TIMER
;
2110 task
->last_timeout
= jiffies
;
2111 spin_unlock(&session
->frwd_lock
);
2112 ISCSI_DBG_EH(session
, "return %s\n", rc
== BLK_EH_RESET_TIMER
?
2113 "timer reset" : "shutdown or nh");
2116 EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out
);
2118 static void iscsi_check_transport_timeouts(struct timer_list
*t
)
2120 struct iscsi_conn
*conn
= from_timer(conn
, t
, transport_timer
);
2121 struct iscsi_session
*session
= conn
->session
;
2122 unsigned long recv_timeout
, next_timeout
= 0, last_recv
;
2124 spin_lock(&session
->frwd_lock
);
2125 if (session
->state
!= ISCSI_STATE_LOGGED_IN
)
2128 recv_timeout
= conn
->recv_timeout
;
2133 last_recv
= conn
->last_recv
;
2135 if (iscsi_has_ping_timed_out(conn
)) {
2136 iscsi_conn_printk(KERN_ERR
, conn
, "ping timeout of %d secs "
2137 "expired, recv timeout %d, last rx %lu, "
2138 "last ping %lu, now %lu\n",
2139 conn
->ping_timeout
, conn
->recv_timeout
,
2140 last_recv
, conn
->last_ping
, jiffies
);
2141 spin_unlock(&session
->frwd_lock
);
2142 iscsi_conn_failure(conn
, ISCSI_ERR_NOP_TIMEDOUT
);
2146 if (time_before_eq(last_recv
+ recv_timeout
, jiffies
)) {
2147 /* send a ping to try to provoke some traffic */
2148 ISCSI_DBG_CONN(conn
, "Sending nopout as ping\n");
2149 if (iscsi_send_nopout(conn
, NULL
))
2150 next_timeout
= jiffies
+ (1 * HZ
);
2152 next_timeout
= conn
->last_ping
+ (conn
->ping_timeout
* HZ
);
2154 next_timeout
= last_recv
+ recv_timeout
;
2156 ISCSI_DBG_CONN(conn
, "Setting next tmo %lu\n", next_timeout
);
2157 mod_timer(&conn
->transport_timer
, next_timeout
);
2159 spin_unlock(&session
->frwd_lock
);
2162 static void iscsi_prep_abort_task_pdu(struct iscsi_task
*task
,
2163 struct iscsi_tm
*hdr
)
2165 memset(hdr
, 0, sizeof(*hdr
));
2166 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
2167 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
& ISCSI_FLAG_TM_FUNC_MASK
;
2168 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2169 hdr
->lun
= task
->lun
;
2170 hdr
->rtt
= task
->hdr_itt
;
2171 hdr
->refcmdsn
= task
->cmdsn
;
2174 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
2176 struct iscsi_cls_session
*cls_session
;
2177 struct iscsi_session
*session
;
2178 struct iscsi_conn
*conn
;
2179 struct iscsi_task
*task
;
2180 struct iscsi_tm
*hdr
;
2183 cls_session
= starget_to_session(scsi_target(sc
->device
));
2184 session
= cls_session
->dd_data
;
2186 ISCSI_DBG_EH(session
, "aborting sc %p\n", sc
);
2188 mutex_lock(&session
->eh_mutex
);
2189 spin_lock_bh(&session
->frwd_lock
);
2191 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2195 ISCSI_DBG_EH(session
, "sc never reached iscsi layer or "
2197 spin_unlock_bh(&session
->frwd_lock
);
2198 mutex_unlock(&session
->eh_mutex
);
2203 * If we are not logged in or we have started a new session
2204 * then let the host reset code handle this
2206 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
||
2207 sc
->SCp
.phase
!= session
->age
) {
2208 spin_unlock_bh(&session
->frwd_lock
);
2209 mutex_unlock(&session
->eh_mutex
);
2210 ISCSI_DBG_EH(session
, "failing abort due to dropped "
2215 conn
= session
->leadconn
;
2216 conn
->eh_abort_cnt
++;
2219 task
= (struct iscsi_task
*)sc
->SCp
.ptr
;
2220 ISCSI_DBG_EH(session
, "aborting [sc %p itt 0x%x]\n",
2223 /* task completed before time out */
2225 ISCSI_DBG_EH(session
, "sc completed while abort in progress\n");
2229 if (task
->state
== ISCSI_TASK_PENDING
) {
2230 fail_scsi_task(task
, DID_ABORT
);
2234 /* only have one tmf outstanding at a time */
2235 if (conn
->tmf_state
!= TMF_INITIAL
)
2237 conn
->tmf_state
= TMF_QUEUED
;
2240 iscsi_prep_abort_task_pdu(task
, hdr
);
2242 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, age
, session
->abort_timeout
))
2245 switch (conn
->tmf_state
) {
2247 spin_unlock_bh(&session
->frwd_lock
);
2249 * stop tx side incase the target had sent a abort rsp but
2250 * the initiator was still writing out data.
2252 iscsi_suspend_tx(conn
);
2254 * we do not stop the recv side because targets have been
2255 * good and have never sent us a successful tmf response
2256 * then sent more data for the cmd.
2258 spin_lock_bh(&session
->frwd_lock
);
2259 fail_scsi_task(task
, DID_ABORT
);
2260 conn
->tmf_state
= TMF_INITIAL
;
2261 memset(hdr
, 0, sizeof(*hdr
));
2262 spin_unlock_bh(&session
->frwd_lock
);
2263 iscsi_start_tx(conn
);
2264 goto success_unlocked
;
2266 spin_unlock_bh(&session
->frwd_lock
);
2267 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2268 goto failed_unlocked
;
2271 conn
->tmf_state
= TMF_INITIAL
;
2272 memset(hdr
, 0, sizeof(*hdr
));
2273 /* task completed before tmf abort response */
2274 ISCSI_DBG_EH(session
, "sc completed while abort in "
2280 conn
->tmf_state
= TMF_INITIAL
;
2285 spin_unlock_bh(&session
->frwd_lock
);
2287 ISCSI_DBG_EH(session
, "abort success [sc %p itt 0x%x]\n",
2289 mutex_unlock(&session
->eh_mutex
);
2293 spin_unlock_bh(&session
->frwd_lock
);
2295 ISCSI_DBG_EH(session
, "abort failed [sc %p itt 0x%x]\n", sc
,
2296 task
? task
->itt
: 0);
2297 mutex_unlock(&session
->eh_mutex
);
2300 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
2302 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
2304 memset(hdr
, 0, sizeof(*hdr
));
2305 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
2306 hdr
->flags
= ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
2307 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2308 int_to_scsilun(sc
->device
->lun
, &hdr
->lun
);
2309 hdr
->rtt
= RESERVED_ITT
;
2312 int iscsi_eh_device_reset(struct scsi_cmnd
*sc
)
2314 struct iscsi_cls_session
*cls_session
;
2315 struct iscsi_session
*session
;
2316 struct iscsi_conn
*conn
;
2317 struct iscsi_tm
*hdr
;
2320 cls_session
= starget_to_session(scsi_target(sc
->device
));
2321 session
= cls_session
->dd_data
;
2323 ISCSI_DBG_EH(session
, "LU Reset [sc %p lun %llu]\n", sc
,
2326 mutex_lock(&session
->eh_mutex
);
2327 spin_lock_bh(&session
->frwd_lock
);
2329 * Just check if we are not logged in. We cannot check for
2330 * the phase because the reset could come from a ioctl.
2332 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
2334 conn
= session
->leadconn
;
2336 /* only have one tmf outstanding at a time */
2337 if (conn
->tmf_state
!= TMF_INITIAL
)
2339 conn
->tmf_state
= TMF_QUEUED
;
2342 iscsi_prep_lun_reset_pdu(sc
, hdr
);
2344 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
2345 session
->lu_reset_timeout
)) {
2350 switch (conn
->tmf_state
) {
2354 spin_unlock_bh(&session
->frwd_lock
);
2355 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2358 conn
->tmf_state
= TMF_INITIAL
;
2363 spin_unlock_bh(&session
->frwd_lock
);
2365 iscsi_suspend_tx(conn
);
2367 spin_lock_bh(&session
->frwd_lock
);
2368 memset(hdr
, 0, sizeof(*hdr
));
2369 fail_scsi_tasks(conn
, sc
->device
->lun
, DID_ERROR
);
2370 conn
->tmf_state
= TMF_INITIAL
;
2371 spin_unlock_bh(&session
->frwd_lock
);
2373 iscsi_start_tx(conn
);
2377 spin_unlock_bh(&session
->frwd_lock
);
2379 ISCSI_DBG_EH(session
, "dev reset result = %s\n",
2380 rc
== SUCCESS
? "SUCCESS" : "FAILED");
2381 mutex_unlock(&session
->eh_mutex
);
2384 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset
);
2386 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
2388 struct iscsi_session
*session
= cls_session
->dd_data
;
2390 spin_lock_bh(&session
->frwd_lock
);
2391 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
2392 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
2393 if (session
->leadconn
)
2394 wake_up(&session
->leadconn
->ehwait
);
2396 spin_unlock_bh(&session
->frwd_lock
);
2398 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
2401 * iscsi_eh_session_reset - drop session and attempt relogin
2404 * This function will wait for a relogin, session termination from
2405 * userspace, or a recovery/replacement timeout.
2407 int iscsi_eh_session_reset(struct scsi_cmnd
*sc
)
2409 struct iscsi_cls_session
*cls_session
;
2410 struct iscsi_session
*session
;
2411 struct iscsi_conn
*conn
;
2413 cls_session
= starget_to_session(scsi_target(sc
->device
));
2414 session
= cls_session
->dd_data
;
2415 conn
= session
->leadconn
;
2417 mutex_lock(&session
->eh_mutex
);
2418 spin_lock_bh(&session
->frwd_lock
);
2419 if (session
->state
== ISCSI_STATE_TERMINATE
) {
2421 ISCSI_DBG_EH(session
,
2422 "failing session reset: Could not log back into "
2423 "%s [age %d]\n", session
->targetname
,
2425 spin_unlock_bh(&session
->frwd_lock
);
2426 mutex_unlock(&session
->eh_mutex
);
2430 spin_unlock_bh(&session
->frwd_lock
);
2431 mutex_unlock(&session
->eh_mutex
);
2433 * we drop the lock here but the leadconn cannot be destoyed while
2434 * we are in the scsi eh
2436 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2438 ISCSI_DBG_EH(session
, "wait for relogin\n");
2439 wait_event_interruptible(conn
->ehwait
,
2440 session
->state
== ISCSI_STATE_TERMINATE
||
2441 session
->state
== ISCSI_STATE_LOGGED_IN
||
2442 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
2443 if (signal_pending(current
))
2444 flush_signals(current
);
2446 mutex_lock(&session
->eh_mutex
);
2447 spin_lock_bh(&session
->frwd_lock
);
2448 if (session
->state
== ISCSI_STATE_LOGGED_IN
) {
2449 ISCSI_DBG_EH(session
,
2450 "session reset succeeded for %s,%s\n",
2451 session
->targetname
, conn
->persistent_address
);
2454 spin_unlock_bh(&session
->frwd_lock
);
2455 mutex_unlock(&session
->eh_mutex
);
2458 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset
);
2460 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd
*sc
, struct iscsi_tm
*hdr
)
2462 memset(hdr
, 0, sizeof(*hdr
));
2463 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
2464 hdr
->flags
= ISCSI_TM_FUNC_TARGET_WARM_RESET
& ISCSI_FLAG_TM_FUNC_MASK
;
2465 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2466 hdr
->rtt
= RESERVED_ITT
;
2470 * iscsi_eh_target_reset - reset target
2473 * This will attempt to send a warm target reset.
2475 static int iscsi_eh_target_reset(struct scsi_cmnd
*sc
)
2477 struct iscsi_cls_session
*cls_session
;
2478 struct iscsi_session
*session
;
2479 struct iscsi_conn
*conn
;
2480 struct iscsi_tm
*hdr
;
2483 cls_session
= starget_to_session(scsi_target(sc
->device
));
2484 session
= cls_session
->dd_data
;
2486 ISCSI_DBG_EH(session
, "tgt Reset [sc %p tgt %s]\n", sc
,
2487 session
->targetname
);
2489 mutex_lock(&session
->eh_mutex
);
2490 spin_lock_bh(&session
->frwd_lock
);
2492 * Just check if we are not logged in. We cannot check for
2493 * the phase because the reset could come from a ioctl.
2495 if (!session
->leadconn
|| session
->state
!= ISCSI_STATE_LOGGED_IN
)
2497 conn
= session
->leadconn
;
2499 /* only have one tmf outstanding at a time */
2500 if (conn
->tmf_state
!= TMF_INITIAL
)
2502 conn
->tmf_state
= TMF_QUEUED
;
2505 iscsi_prep_tgt_reset_pdu(sc
, hdr
);
2507 if (iscsi_exec_task_mgmt_fn(conn
, hdr
, session
->age
,
2508 session
->tgt_reset_timeout
)) {
2513 switch (conn
->tmf_state
) {
2517 spin_unlock_bh(&session
->frwd_lock
);
2518 iscsi_conn_failure(conn
, ISCSI_ERR_SCSI_EH_SESSION_RST
);
2521 conn
->tmf_state
= TMF_INITIAL
;
2526 spin_unlock_bh(&session
->frwd_lock
);
2528 iscsi_suspend_tx(conn
);
2530 spin_lock_bh(&session
->frwd_lock
);
2531 memset(hdr
, 0, sizeof(*hdr
));
2532 fail_scsi_tasks(conn
, -1, DID_ERROR
);
2533 conn
->tmf_state
= TMF_INITIAL
;
2534 spin_unlock_bh(&session
->frwd_lock
);
2536 iscsi_start_tx(conn
);
2540 spin_unlock_bh(&session
->frwd_lock
);
2542 ISCSI_DBG_EH(session
, "tgt %s reset result = %s\n", session
->targetname
,
2543 rc
== SUCCESS
? "SUCCESS" : "FAILED");
2544 mutex_unlock(&session
->eh_mutex
);
2549 * iscsi_eh_recover_target - reset target and possibly the session
2552 * This will attempt to send a warm target reset. If that fails,
2553 * we will escalate to ERL0 session recovery.
2555 int iscsi_eh_recover_target(struct scsi_cmnd
*sc
)
2559 rc
= iscsi_eh_target_reset(sc
);
2561 rc
= iscsi_eh_session_reset(sc
);
2564 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target
);
2567 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2568 * should be accessed via kfifo_{get,put} on q->queue.
2569 * Optionally, the caller can obtain the array of object pointers
2570 * by passing in a non-NULL @items pointer
2573 iscsi_pool_init(struct iscsi_pool
*q
, int max
, void ***items
, int item_size
)
2575 int i
, num_arrays
= 1;
2577 memset(q
, 0, sizeof(*q
));
2581 /* If the user passed an items pointer, he wants a copy of
2585 q
->pool
= kvzalloc(num_arrays
* max
* sizeof(void*), GFP_KERNEL
);
2586 if (q
->pool
== NULL
)
2589 kfifo_init(&q
->queue
, (void*)q
->pool
, max
* sizeof(void*));
2591 for (i
= 0; i
< max
; i
++) {
2592 q
->pool
[i
] = kzalloc(item_size
, GFP_KERNEL
);
2593 if (q
->pool
[i
] == NULL
) {
2597 kfifo_in(&q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
2601 *items
= q
->pool
+ max
;
2602 memcpy(*items
, q
->pool
, max
* sizeof(void *));
2611 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
2613 void iscsi_pool_free(struct iscsi_pool
*q
)
2617 for (i
= 0; i
< q
->max
; i
++)
2621 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
2624 * iscsi_host_add - add host to system
2626 * @pdev: parent device
2628 * This should be called by partial offload and software iscsi drivers
2629 * to add a host to the system.
2631 int iscsi_host_add(struct Scsi_Host
*shost
, struct device
*pdev
)
2633 if (!shost
->can_queue
)
2634 shost
->can_queue
= ISCSI_DEF_XMIT_CMDS_MAX
;
2636 if (!shost
->cmd_per_lun
)
2637 shost
->cmd_per_lun
= ISCSI_DEF_CMD_PER_LUN
;
2639 return scsi_add_host(shost
, pdev
);
2641 EXPORT_SYMBOL_GPL(iscsi_host_add
);
2644 * iscsi_host_alloc - allocate a host and driver data
2645 * @sht: scsi host template
2646 * @dd_data_size: driver host data size
2647 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2649 * This should be called by partial offload and software iscsi drivers.
2650 * To access the driver specific memory use the iscsi_host_priv() macro.
2652 struct Scsi_Host
*iscsi_host_alloc(struct scsi_host_template
*sht
,
2653 int dd_data_size
, bool xmit_can_sleep
)
2655 struct Scsi_Host
*shost
;
2656 struct iscsi_host
*ihost
;
2658 shost
= scsi_host_alloc(sht
, sizeof(struct iscsi_host
) + dd_data_size
);
2661 ihost
= shost_priv(shost
);
2663 if (xmit_can_sleep
) {
2664 snprintf(ihost
->workq_name
, sizeof(ihost
->workq_name
),
2665 "iscsi_q_%d", shost
->host_no
);
2666 ihost
->workq
= create_singlethread_workqueue(ihost
->workq_name
);
2671 spin_lock_init(&ihost
->lock
);
2672 ihost
->state
= ISCSI_HOST_SETUP
;
2673 ihost
->num_sessions
= 0;
2674 init_waitqueue_head(&ihost
->session_removal_wq
);
2678 scsi_host_put(shost
);
2681 EXPORT_SYMBOL_GPL(iscsi_host_alloc
);
2683 static void iscsi_notify_host_removed(struct iscsi_cls_session
*cls_session
)
2685 iscsi_session_failure(cls_session
->dd_data
, ISCSI_ERR_INVALID_HOST
);
2689 * iscsi_host_remove - remove host and sessions
2692 * If there are any sessions left, this will initiate the removal and wait
2693 * for the completion.
2695 void iscsi_host_remove(struct Scsi_Host
*shost
)
2697 struct iscsi_host
*ihost
= shost_priv(shost
);
2698 unsigned long flags
;
2700 spin_lock_irqsave(&ihost
->lock
, flags
);
2701 ihost
->state
= ISCSI_HOST_REMOVED
;
2702 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2704 iscsi_host_for_each_session(shost
, iscsi_notify_host_removed
);
2705 wait_event_interruptible(ihost
->session_removal_wq
,
2706 ihost
->num_sessions
== 0);
2707 if (signal_pending(current
))
2708 flush_signals(current
);
2710 scsi_remove_host(shost
);
2712 destroy_workqueue(ihost
->workq
);
2714 EXPORT_SYMBOL_GPL(iscsi_host_remove
);
2716 void iscsi_host_free(struct Scsi_Host
*shost
)
2718 struct iscsi_host
*ihost
= shost_priv(shost
);
2720 kfree(ihost
->netdev
);
2721 kfree(ihost
->hwaddress
);
2722 kfree(ihost
->initiatorname
);
2723 scsi_host_put(shost
);
2725 EXPORT_SYMBOL_GPL(iscsi_host_free
);
2727 static void iscsi_host_dec_session_cnt(struct Scsi_Host
*shost
)
2729 struct iscsi_host
*ihost
= shost_priv(shost
);
2730 unsigned long flags
;
2732 shost
= scsi_host_get(shost
);
2734 printk(KERN_ERR
"Invalid state. Cannot notify host removal "
2735 "of session teardown event because host already "
2740 spin_lock_irqsave(&ihost
->lock
, flags
);
2741 ihost
->num_sessions
--;
2742 if (ihost
->num_sessions
== 0)
2743 wake_up(&ihost
->session_removal_wq
);
2744 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2745 scsi_host_put(shost
);
2749 * iscsi_session_setup - create iscsi cls session and host and session
2750 * @iscsit: iscsi transport template
2752 * @cmds_max: session can queue
2753 * @cmd_task_size: LLD task private data size
2754 * @initial_cmdsn: initial CmdSN
2756 * This can be used by software iscsi_transports that allocate
2757 * a session per scsi host.
2759 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2760 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2761 * for nop handling and login/logout requests.
2763 struct iscsi_cls_session
*
2764 iscsi_session_setup(struct iscsi_transport
*iscsit
, struct Scsi_Host
*shost
,
2765 uint16_t cmds_max
, int dd_size
, int cmd_task_size
,
2766 uint32_t initial_cmdsn
, unsigned int id
)
2768 struct iscsi_host
*ihost
= shost_priv(shost
);
2769 struct iscsi_session
*session
;
2770 struct iscsi_cls_session
*cls_session
;
2771 int cmd_i
, scsi_cmds
, total_cmds
= cmds_max
;
2772 unsigned long flags
;
2774 spin_lock_irqsave(&ihost
->lock
, flags
);
2775 if (ihost
->state
== ISCSI_HOST_REMOVED
) {
2776 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2779 ihost
->num_sessions
++;
2780 spin_unlock_irqrestore(&ihost
->lock
, flags
);
2783 total_cmds
= ISCSI_DEF_XMIT_CMDS_MAX
;
2785 * The iscsi layer needs some tasks for nop handling and tmfs,
2786 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2787 * + 1 command for scsi IO.
2789 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
) {
2790 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2791 "must be a power of two that is at least %d.\n",
2792 total_cmds
, ISCSI_TOTAL_CMDS_MIN
);
2793 goto dec_session_count
;
2796 if (total_cmds
> ISCSI_TOTAL_CMDS_MAX
) {
2797 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2798 "must be a power of 2 less than or equal to %d.\n",
2799 cmds_max
, ISCSI_TOTAL_CMDS_MAX
);
2800 total_cmds
= ISCSI_TOTAL_CMDS_MAX
;
2803 if (!is_power_of_2(total_cmds
)) {
2804 printk(KERN_ERR
"iscsi: invalid can_queue of %d. can_queue "
2805 "must be a power of 2.\n", total_cmds
);
2806 total_cmds
= rounddown_pow_of_two(total_cmds
);
2807 if (total_cmds
< ISCSI_TOTAL_CMDS_MIN
)
2809 printk(KERN_INFO
"iscsi: Rounding can_queue to %d.\n",
2812 scsi_cmds
= total_cmds
- ISCSI_MGMT_CMDS_MAX
;
2814 cls_session
= iscsi_alloc_session(shost
, iscsit
,
2815 sizeof(struct iscsi_session
) +
2818 goto dec_session_count
;
2819 session
= cls_session
->dd_data
;
2820 session
->cls_session
= cls_session
;
2821 session
->host
= shost
;
2822 session
->state
= ISCSI_STATE_FREE
;
2823 session
->fast_abort
= 1;
2824 session
->tgt_reset_timeout
= 30;
2825 session
->lu_reset_timeout
= 15;
2826 session
->abort_timeout
= 10;
2827 session
->scsi_cmds_max
= scsi_cmds
;
2828 session
->cmds_max
= total_cmds
;
2829 session
->queued_cmdsn
= session
->cmdsn
= initial_cmdsn
;
2830 session
->exp_cmdsn
= initial_cmdsn
+ 1;
2831 session
->max_cmdsn
= initial_cmdsn
+ 1;
2832 session
->max_r2t
= 1;
2833 session
->tt
= iscsit
;
2834 session
->dd_data
= cls_session
->dd_data
+ sizeof(*session
);
2836 mutex_init(&session
->eh_mutex
);
2837 spin_lock_init(&session
->frwd_lock
);
2838 spin_lock_init(&session
->back_lock
);
2840 /* initialize SCSI PDU commands pool */
2841 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
2842 (void***)&session
->cmds
,
2843 cmd_task_size
+ sizeof(struct iscsi_task
)))
2844 goto cmdpool_alloc_fail
;
2846 /* pre-format cmds pool with ITT */
2847 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
2848 struct iscsi_task
*task
= session
->cmds
[cmd_i
];
2851 task
->dd_data
= &task
[1];
2853 task
->state
= ISCSI_TASK_FREE
;
2854 INIT_LIST_HEAD(&task
->running
);
2857 if (!try_module_get(iscsit
->owner
))
2858 goto module_get_fail
;
2860 if (iscsi_add_session(cls_session
, id
))
2861 goto cls_session_fail
;
2866 module_put(iscsit
->owner
);
2868 iscsi_pool_free(&session
->cmdpool
);
2870 iscsi_free_session(cls_session
);
2872 iscsi_host_dec_session_cnt(shost
);
2875 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
2878 * iscsi_session_teardown - destroy session, host, and cls_session
2879 * @cls_session: iscsi session
2881 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
2883 struct iscsi_session
*session
= cls_session
->dd_data
;
2884 struct module
*owner
= cls_session
->transport
->owner
;
2885 struct Scsi_Host
*shost
= session
->host
;
2887 iscsi_pool_free(&session
->cmdpool
);
2889 iscsi_remove_session(cls_session
);
2891 kfree(session
->password
);
2892 kfree(session
->password_in
);
2893 kfree(session
->username
);
2894 kfree(session
->username_in
);
2895 kfree(session
->targetname
);
2896 kfree(session
->targetalias
);
2897 kfree(session
->initiatorname
);
2898 kfree(session
->boot_root
);
2899 kfree(session
->boot_nic
);
2900 kfree(session
->boot_target
);
2901 kfree(session
->ifacename
);
2902 kfree(session
->portal_type
);
2903 kfree(session
->discovery_parent_type
);
2905 iscsi_free_session(cls_session
);
2907 iscsi_host_dec_session_cnt(shost
);
2910 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
2913 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2914 * @cls_session: iscsi_cls_session
2915 * @dd_size: private driver data size
2918 struct iscsi_cls_conn
*
2919 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, int dd_size
,
2922 struct iscsi_session
*session
= cls_session
->dd_data
;
2923 struct iscsi_conn
*conn
;
2924 struct iscsi_cls_conn
*cls_conn
;
2927 cls_conn
= iscsi_create_conn(cls_session
, sizeof(*conn
) + dd_size
,
2931 conn
= cls_conn
->dd_data
;
2932 memset(conn
, 0, sizeof(*conn
) + dd_size
);
2934 conn
->dd_data
= cls_conn
->dd_data
+ sizeof(*conn
);
2935 conn
->session
= session
;
2936 conn
->cls_conn
= cls_conn
;
2937 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
2938 conn
->id
= conn_idx
;
2939 conn
->exp_statsn
= 0;
2940 conn
->tmf_state
= TMF_INITIAL
;
2942 timer_setup(&conn
->transport_timer
, iscsi_check_transport_timeouts
, 0);
2944 INIT_LIST_HEAD(&conn
->mgmtqueue
);
2945 INIT_LIST_HEAD(&conn
->cmdqueue
);
2946 INIT_LIST_HEAD(&conn
->requeue
);
2947 spin_lock_init(&conn
->taskqueuelock
);
2948 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
);
2950 /* allocate login_task used for the login/text sequences */
2951 spin_lock_bh(&session
->frwd_lock
);
2952 if (!kfifo_out(&session
->cmdpool
.queue
,
2953 (void*)&conn
->login_task
,
2955 spin_unlock_bh(&session
->frwd_lock
);
2956 goto login_task_alloc_fail
;
2958 spin_unlock_bh(&session
->frwd_lock
);
2960 data
= (char *) __get_free_pages(GFP_KERNEL
,
2961 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN
));
2963 goto login_task_data_alloc_fail
;
2964 conn
->login_task
->data
= conn
->data
= data
;
2966 timer_setup(&conn
->tmf_timer
, iscsi_tmf_timedout
, 0);
2967 init_waitqueue_head(&conn
->ehwait
);
2971 login_task_data_alloc_fail
:
2972 kfifo_in(&session
->cmdpool
.queue
, (void*)&conn
->login_task
,
2974 login_task_alloc_fail
:
2975 iscsi_destroy_conn(cls_conn
);
2978 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
2981 * iscsi_conn_teardown - teardown iscsi connection
2982 * cls_conn: iscsi class connection
2984 * TODO: we may need to make this into a two step process
2985 * like scsi-mls remove + put host
2987 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
2989 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2990 struct iscsi_session
*session
= conn
->session
;
2992 del_timer_sync(&conn
->transport_timer
);
2994 mutex_lock(&session
->eh_mutex
);
2995 spin_lock_bh(&session
->frwd_lock
);
2996 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
2997 if (session
->leadconn
== conn
) {
2999 * leading connection? then give up on recovery.
3001 session
->state
= ISCSI_STATE_TERMINATE
;
3002 wake_up(&conn
->ehwait
);
3004 spin_unlock_bh(&session
->frwd_lock
);
3006 /* flush queued up work because we free the connection below */
3007 iscsi_suspend_tx(conn
);
3009 spin_lock_bh(&session
->frwd_lock
);
3010 free_pages((unsigned long) conn
->data
,
3011 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN
));
3012 kfree(conn
->persistent_address
);
3013 kfree(conn
->local_ipaddr
);
3014 /* regular RX path uses back_lock */
3015 spin_lock_bh(&session
->back_lock
);
3016 kfifo_in(&session
->cmdpool
.queue
, (void*)&conn
->login_task
,
3018 spin_unlock_bh(&session
->back_lock
);
3019 if (session
->leadconn
== conn
)
3020 session
->leadconn
= NULL
;
3021 spin_unlock_bh(&session
->frwd_lock
);
3022 mutex_unlock(&session
->eh_mutex
);
3024 iscsi_destroy_conn(cls_conn
);
3026 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
3028 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
3030 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3031 struct iscsi_session
*session
= conn
->session
;
3034 iscsi_conn_printk(KERN_ERR
, conn
,
3035 "can't start unbound connection\n");
3039 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
3040 session
->first_burst
> session
->max_burst
) {
3041 iscsi_conn_printk(KERN_INFO
, conn
, "invalid burst lengths: "
3042 "first_burst %d max_burst %d\n",
3043 session
->first_burst
, session
->max_burst
);
3047 if (conn
->ping_timeout
&& !conn
->recv_timeout
) {
3048 iscsi_conn_printk(KERN_ERR
, conn
, "invalid recv timeout of "
3049 "zero. Using 5 seconds\n.");
3050 conn
->recv_timeout
= 5;
3053 if (conn
->recv_timeout
&& !conn
->ping_timeout
) {
3054 iscsi_conn_printk(KERN_ERR
, conn
, "invalid ping timeout of "
3055 "zero. Using 5 seconds.\n");
3056 conn
->ping_timeout
= 5;
3059 spin_lock_bh(&session
->frwd_lock
);
3060 conn
->c_stage
= ISCSI_CONN_STARTED
;
3061 session
->state
= ISCSI_STATE_LOGGED_IN
;
3062 session
->queued_cmdsn
= session
->cmdsn
;
3064 conn
->last_recv
= jiffies
;
3065 conn
->last_ping
= jiffies
;
3066 if (conn
->recv_timeout
&& conn
->ping_timeout
)
3067 mod_timer(&conn
->transport_timer
,
3068 jiffies
+ (conn
->recv_timeout
* HZ
));
3070 switch(conn
->stop_stage
) {
3071 case STOP_CONN_RECOVER
:
3073 * unblock eh_abort() if it is blocked. re-try all
3074 * commands after successful recovery
3076 conn
->stop_stage
= 0;
3077 conn
->tmf_state
= TMF_INITIAL
;
3079 if (session
->age
== 16)
3082 case STOP_CONN_TERM
:
3083 conn
->stop_stage
= 0;
3088 spin_unlock_bh(&session
->frwd_lock
);
3090 iscsi_unblock_session(session
->cls_session
);
3091 wake_up(&conn
->ehwait
);
3094 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
3097 fail_mgmt_tasks(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
3099 struct iscsi_task
*task
;
3102 for (i
= 0; i
< conn
->session
->cmds_max
; i
++) {
3103 task
= conn
->session
->cmds
[i
];
3107 if (task
->state
== ISCSI_TASK_FREE
)
3110 ISCSI_DBG_SESSION(conn
->session
,
3111 "failing mgmt itt 0x%x state %d\n",
3112 task
->itt
, task
->state
);
3113 state
= ISCSI_TASK_ABRT_SESS_RECOV
;
3114 if (task
->state
== ISCSI_TASK_PENDING
)
3115 state
= ISCSI_TASK_COMPLETED
;
3116 iscsi_complete_task(task
, state
);
3121 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
3122 struct iscsi_conn
*conn
, int flag
)
3126 mutex_lock(&session
->eh_mutex
);
3127 spin_lock_bh(&session
->frwd_lock
);
3128 if (conn
->stop_stage
== STOP_CONN_TERM
) {
3129 spin_unlock_bh(&session
->frwd_lock
);
3130 mutex_unlock(&session
->eh_mutex
);
3135 * When this is called for the in_login state, we only want to clean
3136 * up the login task and connection. We do not need to block and set
3137 * the recovery state again
3139 if (flag
== STOP_CONN_TERM
)
3140 session
->state
= ISCSI_STATE_TERMINATE
;
3141 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
3142 session
->state
= ISCSI_STATE_IN_RECOVERY
;
3144 old_stop_stage
= conn
->stop_stage
;
3145 conn
->stop_stage
= flag
;
3146 spin_unlock_bh(&session
->frwd_lock
);
3148 del_timer_sync(&conn
->transport_timer
);
3149 iscsi_suspend_tx(conn
);
3151 spin_lock_bh(&session
->frwd_lock
);
3152 conn
->c_stage
= ISCSI_CONN_STOPPED
;
3153 spin_unlock_bh(&session
->frwd_lock
);
3156 * for connection level recovery we should not calculate
3157 * header digest. conn->hdr_size used for optimization
3158 * in hdr_extract() and will be re-negotiated at
3161 if (flag
== STOP_CONN_RECOVER
) {
3162 conn
->hdrdgst_en
= 0;
3163 conn
->datadgst_en
= 0;
3164 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
3165 old_stop_stage
!= STOP_CONN_RECOVER
) {
3166 ISCSI_DBG_SESSION(session
, "blocking session\n");
3167 iscsi_block_session(session
->cls_session
);
3174 spin_lock_bh(&session
->frwd_lock
);
3175 fail_scsi_tasks(conn
, -1, DID_TRANSPORT_DISRUPTED
);
3176 fail_mgmt_tasks(session
, conn
);
3177 memset(&conn
->tmhdr
, 0, sizeof(conn
->tmhdr
));
3178 spin_unlock_bh(&session
->frwd_lock
);
3179 mutex_unlock(&session
->eh_mutex
);
3182 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
3184 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3185 struct iscsi_session
*session
= conn
->session
;
3188 case STOP_CONN_RECOVER
:
3189 case STOP_CONN_TERM
:
3190 iscsi_start_session_recovery(session
, conn
, flag
);
3193 iscsi_conn_printk(KERN_ERR
, conn
,
3194 "invalid stop flag %d\n", flag
);
3197 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
3199 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
3200 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
3202 struct iscsi_session
*session
= cls_session
->dd_data
;
3203 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3205 spin_lock_bh(&session
->frwd_lock
);
3207 session
->leadconn
= conn
;
3208 spin_unlock_bh(&session
->frwd_lock
);
3211 * Unblock xmitworker(), Login Phase will pass through.
3213 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
3214 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
3217 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
3219 int iscsi_switch_str_param(char **param
, char *new_val_buf
)
3224 if (!strcmp(*param
, new_val_buf
))
3228 new_val
= kstrdup(new_val_buf
, GFP_NOIO
);
3236 EXPORT_SYMBOL_GPL(iscsi_switch_str_param
);
3238 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
3239 enum iscsi_param param
, char *buf
, int buflen
)
3241 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3242 struct iscsi_session
*session
= conn
->session
;
3246 case ISCSI_PARAM_FAST_ABORT
:
3247 sscanf(buf
, "%d", &session
->fast_abort
);
3249 case ISCSI_PARAM_ABORT_TMO
:
3250 sscanf(buf
, "%d", &session
->abort_timeout
);
3252 case ISCSI_PARAM_LU_RESET_TMO
:
3253 sscanf(buf
, "%d", &session
->lu_reset_timeout
);
3255 case ISCSI_PARAM_TGT_RESET_TMO
:
3256 sscanf(buf
, "%d", &session
->tgt_reset_timeout
);
3258 case ISCSI_PARAM_PING_TMO
:
3259 sscanf(buf
, "%d", &conn
->ping_timeout
);
3261 case ISCSI_PARAM_RECV_TMO
:
3262 sscanf(buf
, "%d", &conn
->recv_timeout
);
3264 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
3265 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
3267 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
3268 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
3270 case ISCSI_PARAM_HDRDGST_EN
:
3271 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
3273 case ISCSI_PARAM_DATADGST_EN
:
3274 sscanf(buf
, "%d", &conn
->datadgst_en
);
3276 case ISCSI_PARAM_INITIAL_R2T_EN
:
3277 sscanf(buf
, "%d", &session
->initial_r2t_en
);
3279 case ISCSI_PARAM_MAX_R2T
:
3280 sscanf(buf
, "%hu", &session
->max_r2t
);
3282 case ISCSI_PARAM_IMM_DATA_EN
:
3283 sscanf(buf
, "%d", &session
->imm_data_en
);
3285 case ISCSI_PARAM_FIRST_BURST
:
3286 sscanf(buf
, "%d", &session
->first_burst
);
3288 case ISCSI_PARAM_MAX_BURST
:
3289 sscanf(buf
, "%d", &session
->max_burst
);
3291 case ISCSI_PARAM_PDU_INORDER_EN
:
3292 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
3294 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
3295 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
3297 case ISCSI_PARAM_ERL
:
3298 sscanf(buf
, "%d", &session
->erl
);
3300 case ISCSI_PARAM_EXP_STATSN
:
3301 sscanf(buf
, "%u", &conn
->exp_statsn
);
3303 case ISCSI_PARAM_USERNAME
:
3304 return iscsi_switch_str_param(&session
->username
, buf
);
3305 case ISCSI_PARAM_USERNAME_IN
:
3306 return iscsi_switch_str_param(&session
->username_in
, buf
);
3307 case ISCSI_PARAM_PASSWORD
:
3308 return iscsi_switch_str_param(&session
->password
, buf
);
3309 case ISCSI_PARAM_PASSWORD_IN
:
3310 return iscsi_switch_str_param(&session
->password_in
, buf
);
3311 case ISCSI_PARAM_TARGET_NAME
:
3312 return iscsi_switch_str_param(&session
->targetname
, buf
);
3313 case ISCSI_PARAM_TARGET_ALIAS
:
3314 return iscsi_switch_str_param(&session
->targetalias
, buf
);
3315 case ISCSI_PARAM_TPGT
:
3316 sscanf(buf
, "%d", &session
->tpgt
);
3318 case ISCSI_PARAM_PERSISTENT_PORT
:
3319 sscanf(buf
, "%d", &conn
->persistent_port
);
3321 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
3322 return iscsi_switch_str_param(&conn
->persistent_address
, buf
);
3323 case ISCSI_PARAM_IFACE_NAME
:
3324 return iscsi_switch_str_param(&session
->ifacename
, buf
);
3325 case ISCSI_PARAM_INITIATOR_NAME
:
3326 return iscsi_switch_str_param(&session
->initiatorname
, buf
);
3327 case ISCSI_PARAM_BOOT_ROOT
:
3328 return iscsi_switch_str_param(&session
->boot_root
, buf
);
3329 case ISCSI_PARAM_BOOT_NIC
:
3330 return iscsi_switch_str_param(&session
->boot_nic
, buf
);
3331 case ISCSI_PARAM_BOOT_TARGET
:
3332 return iscsi_switch_str_param(&session
->boot_target
, buf
);
3333 case ISCSI_PARAM_PORTAL_TYPE
:
3334 return iscsi_switch_str_param(&session
->portal_type
, buf
);
3335 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE
:
3336 return iscsi_switch_str_param(&session
->discovery_parent_type
,
3338 case ISCSI_PARAM_DISCOVERY_SESS
:
3339 sscanf(buf
, "%d", &val
);
3340 session
->discovery_sess
= !!val
;
3342 case ISCSI_PARAM_LOCAL_IPADDR
:
3343 return iscsi_switch_str_param(&conn
->local_ipaddr
, buf
);
3350 EXPORT_SYMBOL_GPL(iscsi_set_param
);
3352 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
3353 enum iscsi_param param
, char *buf
)
3355 struct iscsi_session
*session
= cls_session
->dd_data
;
3359 case ISCSI_PARAM_FAST_ABORT
:
3360 len
= sprintf(buf
, "%d\n", session
->fast_abort
);
3362 case ISCSI_PARAM_ABORT_TMO
:
3363 len
= sprintf(buf
, "%d\n", session
->abort_timeout
);
3365 case ISCSI_PARAM_LU_RESET_TMO
:
3366 len
= sprintf(buf
, "%d\n", session
->lu_reset_timeout
);
3368 case ISCSI_PARAM_TGT_RESET_TMO
:
3369 len
= sprintf(buf
, "%d\n", session
->tgt_reset_timeout
);
3371 case ISCSI_PARAM_INITIAL_R2T_EN
:
3372 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
3374 case ISCSI_PARAM_MAX_R2T
:
3375 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
3377 case ISCSI_PARAM_IMM_DATA_EN
:
3378 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
3380 case ISCSI_PARAM_FIRST_BURST
:
3381 len
= sprintf(buf
, "%u\n", session
->first_burst
);
3383 case ISCSI_PARAM_MAX_BURST
:
3384 len
= sprintf(buf
, "%u\n", session
->max_burst
);
3386 case ISCSI_PARAM_PDU_INORDER_EN
:
3387 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
3389 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
3390 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
3392 case ISCSI_PARAM_DEF_TASKMGMT_TMO
:
3393 len
= sprintf(buf
, "%d\n", session
->def_taskmgmt_tmo
);
3395 case ISCSI_PARAM_ERL
:
3396 len
= sprintf(buf
, "%d\n", session
->erl
);
3398 case ISCSI_PARAM_TARGET_NAME
:
3399 len
= sprintf(buf
, "%s\n", session
->targetname
);
3401 case ISCSI_PARAM_TARGET_ALIAS
:
3402 len
= sprintf(buf
, "%s\n", session
->targetalias
);
3404 case ISCSI_PARAM_TPGT
:
3405 len
= sprintf(buf
, "%d\n", session
->tpgt
);
3407 case ISCSI_PARAM_USERNAME
:
3408 len
= sprintf(buf
, "%s\n", session
->username
);
3410 case ISCSI_PARAM_USERNAME_IN
:
3411 len
= sprintf(buf
, "%s\n", session
->username_in
);
3413 case ISCSI_PARAM_PASSWORD
:
3414 len
= sprintf(buf
, "%s\n", session
->password
);
3416 case ISCSI_PARAM_PASSWORD_IN
:
3417 len
= sprintf(buf
, "%s\n", session
->password_in
);
3419 case ISCSI_PARAM_IFACE_NAME
:
3420 len
= sprintf(buf
, "%s\n", session
->ifacename
);
3422 case ISCSI_PARAM_INITIATOR_NAME
:
3423 len
= sprintf(buf
, "%s\n", session
->initiatorname
);
3425 case ISCSI_PARAM_BOOT_ROOT
:
3426 len
= sprintf(buf
, "%s\n", session
->boot_root
);
3428 case ISCSI_PARAM_BOOT_NIC
:
3429 len
= sprintf(buf
, "%s\n", session
->boot_nic
);
3431 case ISCSI_PARAM_BOOT_TARGET
:
3432 len
= sprintf(buf
, "%s\n", session
->boot_target
);
3434 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE
:
3435 len
= sprintf(buf
, "%u\n", session
->auto_snd_tgt_disable
);
3437 case ISCSI_PARAM_DISCOVERY_SESS
:
3438 len
= sprintf(buf
, "%u\n", session
->discovery_sess
);
3440 case ISCSI_PARAM_PORTAL_TYPE
:
3441 len
= sprintf(buf
, "%s\n", session
->portal_type
);
3443 case ISCSI_PARAM_CHAP_AUTH_EN
:
3444 len
= sprintf(buf
, "%u\n", session
->chap_auth_en
);
3446 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN
:
3447 len
= sprintf(buf
, "%u\n", session
->discovery_logout_en
);
3449 case ISCSI_PARAM_BIDI_CHAP_EN
:
3450 len
= sprintf(buf
, "%u\n", session
->bidi_chap_en
);
3452 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL
:
3453 len
= sprintf(buf
, "%u\n", session
->discovery_auth_optional
);
3455 case ISCSI_PARAM_DEF_TIME2WAIT
:
3456 len
= sprintf(buf
, "%d\n", session
->time2wait
);
3458 case ISCSI_PARAM_DEF_TIME2RETAIN
:
3459 len
= sprintf(buf
, "%d\n", session
->time2retain
);
3461 case ISCSI_PARAM_TSID
:
3462 len
= sprintf(buf
, "%u\n", session
->tsid
);
3464 case ISCSI_PARAM_ISID
:
3465 len
= sprintf(buf
, "%02x%02x%02x%02x%02x%02x\n",
3466 session
->isid
[0], session
->isid
[1],
3467 session
->isid
[2], session
->isid
[3],
3468 session
->isid
[4], session
->isid
[5]);
3470 case ISCSI_PARAM_DISCOVERY_PARENT_IDX
:
3471 len
= sprintf(buf
, "%u\n", session
->discovery_parent_idx
);
3473 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE
:
3474 if (session
->discovery_parent_type
)
3475 len
= sprintf(buf
, "%s\n",
3476 session
->discovery_parent_type
);
3478 len
= sprintf(buf
, "\n");
3486 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
3488 int iscsi_conn_get_addr_param(struct sockaddr_storage
*addr
,
3489 enum iscsi_param param
, char *buf
)
3491 struct sockaddr_in6
*sin6
= NULL
;
3492 struct sockaddr_in
*sin
= NULL
;
3495 switch (addr
->ss_family
) {
3497 sin
= (struct sockaddr_in
*)addr
;
3500 sin6
= (struct sockaddr_in6
*)addr
;
3507 case ISCSI_PARAM_CONN_ADDRESS
:
3508 case ISCSI_HOST_PARAM_IPADDRESS
:
3510 len
= sprintf(buf
, "%pI4\n", &sin
->sin_addr
.s_addr
);
3512 len
= sprintf(buf
, "%pI6\n", &sin6
->sin6_addr
);
3514 case ISCSI_PARAM_CONN_PORT
:
3515 case ISCSI_PARAM_LOCAL_PORT
:
3517 len
= sprintf(buf
, "%hu\n", be16_to_cpu(sin
->sin_port
));
3519 len
= sprintf(buf
, "%hu\n",
3520 be16_to_cpu(sin6
->sin6_port
));
3528 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param
);
3530 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
3531 enum iscsi_param param
, char *buf
)
3533 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
3537 case ISCSI_PARAM_PING_TMO
:
3538 len
= sprintf(buf
, "%u\n", conn
->ping_timeout
);
3540 case ISCSI_PARAM_RECV_TMO
:
3541 len
= sprintf(buf
, "%u\n", conn
->recv_timeout
);
3543 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
3544 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
3546 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
3547 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
3549 case ISCSI_PARAM_HDRDGST_EN
:
3550 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
3552 case ISCSI_PARAM_DATADGST_EN
:
3553 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
3555 case ISCSI_PARAM_IFMARKER_EN
:
3556 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
3558 case ISCSI_PARAM_OFMARKER_EN
:
3559 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
3561 case ISCSI_PARAM_EXP_STATSN
:
3562 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
3564 case ISCSI_PARAM_PERSISTENT_PORT
:
3565 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
3567 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
3568 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
3570 case ISCSI_PARAM_STATSN
:
3571 len
= sprintf(buf
, "%u\n", conn
->statsn
);
3573 case ISCSI_PARAM_MAX_SEGMENT_SIZE
:
3574 len
= sprintf(buf
, "%u\n", conn
->max_segment_size
);
3576 case ISCSI_PARAM_KEEPALIVE_TMO
:
3577 len
= sprintf(buf
, "%u\n", conn
->keepalive_tmo
);
3579 case ISCSI_PARAM_LOCAL_PORT
:
3580 len
= sprintf(buf
, "%u\n", conn
->local_port
);
3582 case ISCSI_PARAM_TCP_TIMESTAMP_STAT
:
3583 len
= sprintf(buf
, "%u\n", conn
->tcp_timestamp_stat
);
3585 case ISCSI_PARAM_TCP_NAGLE_DISABLE
:
3586 len
= sprintf(buf
, "%u\n", conn
->tcp_nagle_disable
);
3588 case ISCSI_PARAM_TCP_WSF_DISABLE
:
3589 len
= sprintf(buf
, "%u\n", conn
->tcp_wsf_disable
);
3591 case ISCSI_PARAM_TCP_TIMER_SCALE
:
3592 len
= sprintf(buf
, "%u\n", conn
->tcp_timer_scale
);
3594 case ISCSI_PARAM_TCP_TIMESTAMP_EN
:
3595 len
= sprintf(buf
, "%u\n", conn
->tcp_timestamp_en
);
3597 case ISCSI_PARAM_IP_FRAGMENT_DISABLE
:
3598 len
= sprintf(buf
, "%u\n", conn
->fragment_disable
);
3600 case ISCSI_PARAM_IPV4_TOS
:
3601 len
= sprintf(buf
, "%u\n", conn
->ipv4_tos
);
3603 case ISCSI_PARAM_IPV6_TC
:
3604 len
= sprintf(buf
, "%u\n", conn
->ipv6_traffic_class
);
3606 case ISCSI_PARAM_IPV6_FLOW_LABEL
:
3607 len
= sprintf(buf
, "%u\n", conn
->ipv6_flow_label
);
3609 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6
:
3610 len
= sprintf(buf
, "%u\n", conn
->is_fw_assigned_ipv6
);
3612 case ISCSI_PARAM_TCP_XMIT_WSF
:
3613 len
= sprintf(buf
, "%u\n", conn
->tcp_xmit_wsf
);
3615 case ISCSI_PARAM_TCP_RECV_WSF
:
3616 len
= sprintf(buf
, "%u\n", conn
->tcp_recv_wsf
);
3618 case ISCSI_PARAM_LOCAL_IPADDR
:
3619 len
= sprintf(buf
, "%s\n", conn
->local_ipaddr
);
3627 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
3629 int iscsi_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
3632 struct iscsi_host
*ihost
= shost_priv(shost
);
3636 case ISCSI_HOST_PARAM_NETDEV_NAME
:
3637 len
= sprintf(buf
, "%s\n", ihost
->netdev
);
3639 case ISCSI_HOST_PARAM_HWADDRESS
:
3640 len
= sprintf(buf
, "%s\n", ihost
->hwaddress
);
3642 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
3643 len
= sprintf(buf
, "%s\n", ihost
->initiatorname
);
3651 EXPORT_SYMBOL_GPL(iscsi_host_get_param
);
3653 int iscsi_host_set_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
3654 char *buf
, int buflen
)
3656 struct iscsi_host
*ihost
= shost_priv(shost
);
3659 case ISCSI_HOST_PARAM_NETDEV_NAME
:
3660 return iscsi_switch_str_param(&ihost
->netdev
, buf
);
3661 case ISCSI_HOST_PARAM_HWADDRESS
:
3662 return iscsi_switch_str_param(&ihost
->hwaddress
, buf
);
3663 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
3664 return iscsi_switch_str_param(&ihost
->initiatorname
, buf
);
3671 EXPORT_SYMBOL_GPL(iscsi_host_set_param
);
3673 MODULE_AUTHOR("Mike Christie");
3674 MODULE_DESCRIPTION("iSCSI library functions");
3675 MODULE_LICENSE("GPL");