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/mutex.h>
26 #include <linux/kfifo.h>
27 #include <linux/delay.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_eh.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi.h>
35 #include <scsi/iscsi_proto.h>
36 #include <scsi/scsi_transport.h>
37 #include <scsi/scsi_transport_iscsi.h>
38 #include <scsi/libiscsi.h>
40 struct iscsi_session
*
41 class_to_transport_session(struct iscsi_cls_session
*cls_session
)
43 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
44 return iscsi_hostdata(shost
->hostdata
);
46 EXPORT_SYMBOL_GPL(class_to_transport_session
);
48 #define INVALID_SN_DELTA 0xffff
51 iscsi_check_assign_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
53 uint32_t max_cmdsn
= be32_to_cpu(hdr
->max_cmdsn
);
54 uint32_t exp_cmdsn
= be32_to_cpu(hdr
->exp_cmdsn
);
56 if (max_cmdsn
< exp_cmdsn
-1 &&
57 max_cmdsn
> exp_cmdsn
- INVALID_SN_DELTA
)
58 return ISCSI_ERR_MAX_CMDSN
;
59 if (max_cmdsn
> session
->max_cmdsn
||
60 max_cmdsn
< session
->max_cmdsn
- INVALID_SN_DELTA
)
61 session
->max_cmdsn
= max_cmdsn
;
62 if (exp_cmdsn
> session
->exp_cmdsn
||
63 exp_cmdsn
< session
->exp_cmdsn
- INVALID_SN_DELTA
)
64 session
->exp_cmdsn
= exp_cmdsn
;
68 EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn
);
70 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task
*ctask
,
71 struct iscsi_data
*hdr
)
73 struct iscsi_conn
*conn
= ctask
->conn
;
75 memset(hdr
, 0, sizeof(struct iscsi_data
));
76 hdr
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
77 hdr
->datasn
= cpu_to_be32(ctask
->unsol_datasn
);
78 ctask
->unsol_datasn
++;
79 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
80 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
82 hdr
->itt
= ctask
->hdr
->itt
;
83 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
84 hdr
->offset
= cpu_to_be32(ctask
->unsol_offset
);
86 if (ctask
->unsol_count
> conn
->max_xmit_dlength
) {
87 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
88 ctask
->data_count
= conn
->max_xmit_dlength
;
89 ctask
->unsol_offset
+= ctask
->data_count
;
92 hton24(hdr
->dlength
, ctask
->unsol_count
);
93 ctask
->data_count
= ctask
->unsol_count
;
94 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
97 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu
);
100 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
101 * @ctask: iscsi cmd task
103 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
104 * fields like dlength or final based on how much data it sends
106 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task
*ctask
)
108 struct iscsi_conn
*conn
= ctask
->conn
;
109 struct iscsi_session
*session
= conn
->session
;
110 struct iscsi_cmd
*hdr
= ctask
->hdr
;
111 struct scsi_cmnd
*sc
= ctask
->sc
;
113 hdr
->opcode
= ISCSI_OP_SCSI_CMD
;
114 hdr
->flags
= ISCSI_ATTR_SIMPLE
;
115 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)hdr
->lun
);
116 hdr
->itt
= ctask
->itt
| (conn
->id
<< ISCSI_CID_SHIFT
) |
117 (session
->age
<< ISCSI_AGE_SHIFT
);
118 hdr
->data_length
= cpu_to_be32(sc
->request_bufflen
);
119 hdr
->cmdsn
= cpu_to_be32(session
->cmdsn
);
121 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
122 memcpy(hdr
->cdb
, sc
->cmnd
, sc
->cmd_len
);
123 memset(&hdr
->cdb
[sc
->cmd_len
], 0, MAX_COMMAND_SIZE
- sc
->cmd_len
);
125 ctask
->data_count
= 0;
126 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
127 hdr
->flags
|= ISCSI_FLAG_CMD_WRITE
;
131 * imm_count bytes to be sent right after
134 * unsol_count bytes(as Data-Out) to be sent
135 * without R2T ack right after
138 * r2t_data_count bytes to be sent via R2T ack's
140 * pad_count bytes to be sent as zero-padding
142 ctask
->imm_count
= 0;
143 ctask
->unsol_count
= 0;
144 ctask
->unsol_offset
= 0;
145 ctask
->unsol_datasn
= 0;
147 if (session
->imm_data_en
) {
148 if (ctask
->total_length
>= session
->first_burst
)
149 ctask
->imm_count
= min(session
->first_burst
,
150 conn
->max_xmit_dlength
);
152 ctask
->imm_count
= min(ctask
->total_length
,
153 conn
->max_xmit_dlength
);
154 hton24(ctask
->hdr
->dlength
, ctask
->imm_count
);
156 zero_data(ctask
->hdr
->dlength
);
158 if (!session
->initial_r2t_en
) {
159 ctask
->unsol_count
= min(session
->first_burst
,
160 ctask
->total_length
) - ctask
->imm_count
;
161 ctask
->unsol_offset
= ctask
->imm_count
;
164 if (!ctask
->unsol_count
)
165 /* No unsolicit Data-Out's */
166 ctask
->hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
169 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
170 zero_data(hdr
->dlength
);
172 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
173 hdr
->flags
|= ISCSI_FLAG_CMD_READ
;
176 conn
->scsicmd_pdus_cnt
++;
178 EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu
);
181 * iscsi_complete_command - return command back to scsi-ml
182 * @ctask: iscsi cmd task
184 * Must be called with session lock.
185 * This function returns the scsi command to scsi-ml and returns
186 * the cmd task to the pool of available cmd tasks.
188 static void iscsi_complete_command(struct iscsi_cmd_task
*ctask
)
190 struct iscsi_session
*session
= ctask
->conn
->session
;
191 struct scsi_cmnd
*sc
= ctask
->sc
;
193 ctask
->state
= ISCSI_TASK_COMPLETED
;
195 /* SCSI eh reuses commands to verify us */
197 list_del_init(&ctask
->running
);
198 __kfifo_put(session
->cmdpool
.queue
, (void*)&ctask
, sizeof(void*));
202 static void __iscsi_get_ctask(struct iscsi_cmd_task
*ctask
)
204 atomic_inc(&ctask
->refcount
);
207 static void iscsi_get_ctask(struct iscsi_cmd_task
*ctask
)
209 spin_lock_bh(&ctask
->conn
->session
->lock
);
210 __iscsi_get_ctask(ctask
);
211 spin_unlock_bh(&ctask
->conn
->session
->lock
);
214 static void __iscsi_put_ctask(struct iscsi_cmd_task
*ctask
)
216 if (atomic_dec_and_test(&ctask
->refcount
))
217 iscsi_complete_command(ctask
);
220 static void iscsi_put_ctask(struct iscsi_cmd_task
*ctask
)
222 spin_lock_bh(&ctask
->conn
->session
->lock
);
223 __iscsi_put_ctask(ctask
);
224 spin_unlock_bh(&ctask
->conn
->session
->lock
);
228 * iscsi_cmd_rsp - SCSI Command Response processing
229 * @conn: iscsi connection
231 * @ctask: scsi command task
232 * @data: cmd data buffer
233 * @datalen: len of buffer
235 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
236 * then completes the command and task.
238 static int iscsi_scsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
239 struct iscsi_cmd_task
*ctask
, char *data
,
243 struct iscsi_cmd_rsp
*rhdr
= (struct iscsi_cmd_rsp
*)hdr
;
244 struct iscsi_session
*session
= conn
->session
;
245 struct scsi_cmnd
*sc
= ctask
->sc
;
247 rc
= iscsi_check_assign_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
249 sc
->result
= DID_ERROR
<< 16;
253 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
255 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
257 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
258 sc
->result
= DID_ERROR
<< 16;
262 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
) {
267 printk(KERN_ERR
"iscsi: Got CHECK_CONDITION but "
268 "invalid data buffer size of %d\n", datalen
);
269 sc
->result
= DID_BAD_TARGET
<< 16;
273 senselen
= (data
[0] << 8) | data
[1];
274 if (datalen
< senselen
)
275 goto invalid_datalen
;
277 memcpy(sc
->sense_buffer
, data
+ 2,
278 min(senselen
, SCSI_SENSE_BUFFERSIZE
));
279 debug_scsi("copied %d bytes of sense\n",
280 min(senselen
, SCSI_SENSE_BUFFERSIZE
));
283 if (sc
->sc_data_direction
== DMA_TO_DEVICE
)
286 if (rhdr
->flags
& ISCSI_FLAG_CMD_UNDERFLOW
) {
287 int res_count
= be32_to_cpu(rhdr
->residual_count
);
289 if (res_count
> 0 && res_count
<= sc
->request_bufflen
)
290 sc
->resid
= res_count
;
292 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
293 } else if (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_UNDERFLOW
)
294 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
295 else if (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
)
296 sc
->resid
= be32_to_cpu(rhdr
->residual_count
);
299 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
300 (long)sc
, sc
->result
, ctask
->itt
);
301 conn
->scsirsp_pdus_cnt
++;
303 __iscsi_put_ctask(ctask
);
307 static void iscsi_tmf_rsp(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
)
309 struct iscsi_tm_rsp
*tmf
= (struct iscsi_tm_rsp
*)hdr
;
311 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
312 conn
->tmfrsp_pdus_cnt
++;
314 if (conn
->tmabort_state
!= TMABORT_INITIAL
)
317 if (tmf
->response
== ISCSI_TMF_RSP_COMPLETE
)
318 conn
->tmabort_state
= TMABORT_SUCCESS
;
319 else if (tmf
->response
== ISCSI_TMF_RSP_NO_TASK
)
320 conn
->tmabort_state
= TMABORT_NOT_FOUND
;
322 conn
->tmabort_state
= TMABORT_FAILED
;
323 wake_up(&conn
->ehwait
);
326 static int iscsi_handle_reject(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
327 char *data
, int datalen
)
329 struct iscsi_reject
*reject
= (struct iscsi_reject
*)hdr
;
330 struct iscsi_hdr rejected_pdu
;
333 conn
->exp_statsn
= be32_to_cpu(reject
->statsn
) + 1;
335 if (reject
->reason
== ISCSI_REASON_DATA_DIGEST_ERROR
) {
336 if (ntoh24(reject
->dlength
) > datalen
)
337 return ISCSI_ERR_PROTO
;
339 if (ntoh24(reject
->dlength
) >= sizeof(struct iscsi_hdr
)) {
340 memcpy(&rejected_pdu
, data
, sizeof(struct iscsi_hdr
));
341 itt
= rejected_pdu
.itt
& ISCSI_ITT_MASK
;
342 printk(KERN_ERR
"itt 0x%x had pdu (op 0x%x) rejected "
343 "due to DataDigest error.\n", itt
,
344 rejected_pdu
.opcode
);
351 * __iscsi_complete_pdu - complete pdu
355 * @datalen: len of data buffer
357 * Completes pdu processing by freeing any resources allocated at
358 * queuecommand or send generic. session lock must be held and verify
359 * itt must have been called.
361 int __iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
362 char *data
, int datalen
)
364 struct iscsi_session
*session
= conn
->session
;
365 int opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
, rc
= 0;
366 struct iscsi_cmd_task
*ctask
;
367 struct iscsi_mgmt_task
*mtask
;
370 if (hdr
->itt
!= cpu_to_be32(ISCSI_RESERVED_TAG
))
371 itt
= hdr
->itt
& ISCSI_ITT_MASK
;
375 if (itt
< session
->cmds_max
) {
376 ctask
= session
->cmds
[itt
];
378 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
379 opcode
, conn
->id
, ctask
->itt
, datalen
);
382 case ISCSI_OP_SCSI_CMD_RSP
:
383 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
384 rc
= iscsi_scsi_cmd_rsp(conn
, hdr
, ctask
, data
,
387 case ISCSI_OP_SCSI_DATA_IN
:
388 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
389 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
390 conn
->scsirsp_pdus_cnt
++;
391 __iscsi_put_ctask(ctask
);
395 /* LLD handles this for now */
398 rc
= ISCSI_ERR_BAD_OPCODE
;
401 } else if (itt
>= ISCSI_MGMT_ITT_OFFSET
&&
402 itt
< ISCSI_MGMT_ITT_OFFSET
+ session
->mgmtpool_max
) {
403 mtask
= session
->mgmt_cmds
[itt
- ISCSI_MGMT_ITT_OFFSET
];
405 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
406 opcode
, conn
->id
, mtask
->itt
, datalen
);
408 rc
= iscsi_check_assign_cmdsn(session
,
409 (struct iscsi_nopin
*)hdr
);
414 case ISCSI_OP_LOGOUT_RSP
:
416 rc
= ISCSI_ERR_PROTO
;
419 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
421 case ISCSI_OP_LOGIN_RSP
:
422 case ISCSI_OP_TEXT_RSP
:
424 * login related PDU's exp_statsn is handled in
427 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
428 rc
= ISCSI_ERR_CONN_FAILED
;
429 list_del(&mtask
->running
);
430 if (conn
->login_mtask
!= mtask
)
431 __kfifo_put(session
->mgmtpool
.queue
,
432 (void*)&mtask
, sizeof(void*));
434 case ISCSI_OP_SCSI_TMFUNC_RSP
:
436 rc
= ISCSI_ERR_PROTO
;
440 iscsi_tmf_rsp(conn
, hdr
);
442 case ISCSI_OP_NOOP_IN
:
443 if (hdr
->ttt
!= ISCSI_RESERVED_TAG
|| datalen
) {
444 rc
= ISCSI_ERR_PROTO
;
447 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
449 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
450 rc
= ISCSI_ERR_CONN_FAILED
;
451 list_del(&mtask
->running
);
452 if (conn
->login_mtask
!= mtask
)
453 __kfifo_put(session
->mgmtpool
.queue
,
454 (void*)&mtask
, sizeof(void*));
457 rc
= ISCSI_ERR_BAD_OPCODE
;
460 } else if (itt
== ISCSI_RESERVED_TAG
) {
461 rc
= iscsi_check_assign_cmdsn(session
,
462 (struct iscsi_nopin
*)hdr
);
467 case ISCSI_OP_NOOP_IN
:
469 rc
= ISCSI_ERR_PROTO
;
473 if (hdr
->ttt
== ISCSI_RESERVED_TAG
)
476 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, NULL
, 0))
477 rc
= ISCSI_ERR_CONN_FAILED
;
479 case ISCSI_OP_REJECT
:
480 rc
= iscsi_handle_reject(conn
, hdr
, data
, datalen
);
482 case ISCSI_OP_ASYNC_EVENT
:
483 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
484 if (iscsi_recv_pdu(conn
->cls_conn
, hdr
, data
, datalen
))
485 rc
= ISCSI_ERR_CONN_FAILED
;
488 rc
= ISCSI_ERR_BAD_OPCODE
;
492 rc
= ISCSI_ERR_BAD_ITT
;
497 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu
);
499 int iscsi_complete_pdu(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
500 char *data
, int datalen
)
504 spin_lock(&conn
->session
->lock
);
505 rc
= __iscsi_complete_pdu(conn
, hdr
, data
, datalen
);
506 spin_unlock(&conn
->session
->lock
);
509 EXPORT_SYMBOL_GPL(iscsi_complete_pdu
);
511 /* verify itt (itt encoding: age+cid+itt) */
512 int iscsi_verify_itt(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
515 struct iscsi_session
*session
= conn
->session
;
516 struct iscsi_cmd_task
*ctask
;
519 if (hdr
->itt
!= cpu_to_be32(ISCSI_RESERVED_TAG
)) {
520 if ((hdr
->itt
& ISCSI_AGE_MASK
) !=
521 (session
->age
<< ISCSI_AGE_SHIFT
)) {
522 printk(KERN_ERR
"iscsi: received itt %x expected "
523 "session age (%x)\n", hdr
->itt
,
524 session
->age
& ISCSI_AGE_MASK
);
525 return ISCSI_ERR_BAD_ITT
;
528 if ((hdr
->itt
& ISCSI_CID_MASK
) !=
529 (conn
->id
<< ISCSI_CID_SHIFT
)) {
530 printk(KERN_ERR
"iscsi: received itt %x, expected "
531 "CID (%x)\n", hdr
->itt
, conn
->id
);
532 return ISCSI_ERR_BAD_ITT
;
534 itt
= hdr
->itt
& ISCSI_ITT_MASK
;
538 if (itt
< session
->cmds_max
) {
539 ctask
= session
->cmds
[itt
];
542 printk(KERN_INFO
"iscsi: dropping ctask with "
543 "itt 0x%x\n", ctask
->itt
);
545 return ISCSI_ERR_NO_SCSI_CMD
;
548 if (ctask
->sc
->SCp
.phase
!= session
->age
) {
549 printk(KERN_ERR
"iscsi: ctask's session age %d, "
550 "expected %d\n", ctask
->sc
->SCp
.phase
,
552 return ISCSI_ERR_SESSION_FAILED
;
559 EXPORT_SYMBOL_GPL(iscsi_verify_itt
);
561 void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
563 struct iscsi_session
*session
= conn
->session
;
566 spin_lock_irqsave(&session
->lock
, flags
);
567 if (session
->state
== ISCSI_STATE_FAILED
) {
568 spin_unlock_irqrestore(&session
->lock
, flags
);
572 if (conn
->stop_stage
== 0)
573 session
->state
= ISCSI_STATE_FAILED
;
574 spin_unlock_irqrestore(&session
->lock
, flags
);
575 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
576 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
577 iscsi_conn_error(conn
->cls_conn
, err
);
579 EXPORT_SYMBOL_GPL(iscsi_conn_failure
);
581 static int iscsi_xmit_imm_task(struct iscsi_conn
*conn
)
583 struct iscsi_hdr
*hdr
= conn
->mtask
->hdr
;
584 int rc
, was_logout
= 0;
586 if ((hdr
->opcode
& ISCSI_OPCODE_MASK
) == ISCSI_OP_LOGOUT
) {
587 conn
->session
->state
= ISCSI_STATE_IN_RECOVERY
;
588 iscsi_block_session(session_to_cls(conn
->session
));
591 rc
= conn
->session
->tt
->xmit_mgmt_task(conn
, conn
->mtask
);
596 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
603 * iscsi_data_xmit - xmit any command into the scheduled connection
604 * @conn: iscsi connection
607 * The function can return -EAGAIN in which case the caller must
608 * re-schedule it again later or recover. '0' return code means
611 static int iscsi_data_xmit(struct iscsi_conn
*conn
)
613 struct iscsi_transport
*tt
;
616 if (unlikely(conn
->suspend_tx
)) {
617 debug_scsi("conn %d Tx suspended!\n", conn
->id
);
620 tt
= conn
->session
->tt
;
623 * Transmit in the following order:
625 * 1) un-finished xmit (ctask or mtask)
626 * 2) immediate control PDUs
629 * 5) non-immediate control PDUs
631 * No need to lock around __kfifo_get as long as
632 * there's one producer and one consumer.
635 BUG_ON(conn
->ctask
&& conn
->mtask
);
638 iscsi_get_ctask(conn
->ctask
);
639 rc
= tt
->xmit_cmd_task(conn
, conn
->ctask
);
640 iscsi_put_ctask(conn
->ctask
);
643 /* done with this in-progress ctask */
647 rc
= iscsi_xmit_imm_task(conn
);
650 /* done with this in-progress mtask */
654 /* process immediate first */
655 if (unlikely(__kfifo_len(conn
->immqueue
))) {
656 while (__kfifo_get(conn
->immqueue
, (void*)&conn
->mtask
,
658 spin_lock_bh(&conn
->session
->lock
);
659 list_add_tail(&conn
->mtask
->running
,
660 &conn
->mgmt_run_list
);
661 spin_unlock_bh(&conn
->session
->lock
);
662 rc
= iscsi_xmit_imm_task(conn
);
666 /* done with this mtask */
670 /* process command queue */
671 spin_lock_bh(&conn
->session
->lock
);
672 while (!list_empty(&conn
->xmitqueue
)) {
674 * iscsi tcp may readd the task to the xmitqueue to send
677 conn
->ctask
= list_entry(conn
->xmitqueue
.next
,
678 struct iscsi_cmd_task
, running
);
679 conn
->ctask
->state
= ISCSI_TASK_RUNNING
;
680 list_move_tail(conn
->xmitqueue
.next
, &conn
->run_list
);
681 __iscsi_get_ctask(conn
->ctask
);
682 spin_unlock_bh(&conn
->session
->lock
);
684 rc
= tt
->xmit_cmd_task(conn
, conn
->ctask
);
686 spin_lock_bh(&conn
->session
->lock
);
687 __iscsi_put_ctask(conn
->ctask
);
689 spin_unlock_bh(&conn
->session
->lock
);
693 spin_unlock_bh(&conn
->session
->lock
);
694 /* done with this ctask */
697 /* process the rest control plane PDUs, if any */
698 if (unlikely(__kfifo_len(conn
->mgmtqueue
))) {
699 while (__kfifo_get(conn
->mgmtqueue
, (void*)&conn
->mtask
,
701 spin_lock_bh(&conn
->session
->lock
);
702 list_add_tail(&conn
->mtask
->running
,
703 &conn
->mgmt_run_list
);
704 spin_unlock_bh(&conn
->session
->lock
);
705 rc
= tt
->xmit_mgmt_task(conn
, conn
->mtask
);
709 /* done with this mtask */
716 if (unlikely(conn
->suspend_tx
))
722 static void iscsi_xmitworker(void *data
)
724 struct iscsi_conn
*conn
= data
;
727 * serialize Xmit worker on a per-connection basis.
729 mutex_lock(&conn
->xmitmutex
);
731 rc
= iscsi_data_xmit(conn
);
732 } while (rc
>= 0 || rc
== -EAGAIN
);
733 mutex_unlock(&conn
->xmitmutex
);
737 FAILURE_BAD_HOST
= 1,
738 FAILURE_SESSION_FAILED
,
739 FAILURE_SESSION_FREED
,
740 FAILURE_WINDOW_CLOSED
,
742 FAILURE_SESSION_TERMINATE
,
743 FAILURE_SESSION_IN_RECOVERY
,
744 FAILURE_SESSION_RECOVERY_TIMEOUT
,
747 int iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
749 struct Scsi_Host
*host
;
751 struct iscsi_session
*session
;
752 struct iscsi_conn
*conn
;
753 struct iscsi_cmd_task
*ctask
= NULL
;
755 sc
->scsi_done
= done
;
759 host
= sc
->device
->host
;
760 session
= iscsi_hostdata(host
->hostdata
);
762 spin_lock(&session
->lock
);
765 * ISCSI_STATE_FAILED is a temp. state. The recovery
766 * code will decide what is best to do with command queued
769 if (session
->state
!= ISCSI_STATE_LOGGED_IN
&&
770 session
->state
!= ISCSI_STATE_FAILED
) {
772 * to handle the race between when we set the recovery state
773 * and block the session we requeue here (commands could
774 * be entering our queuecommand while a block is starting
775 * up because the block code is not locked)
777 if (session
->state
== ISCSI_STATE_IN_RECOVERY
) {
778 reason
= FAILURE_SESSION_IN_RECOVERY
;
782 if (session
->state
== ISCSI_STATE_RECOVERY_FAILED
)
783 reason
= FAILURE_SESSION_RECOVERY_TIMEOUT
;
784 else if (session
->state
== ISCSI_STATE_TERMINATE
)
785 reason
= FAILURE_SESSION_TERMINATE
;
787 reason
= FAILURE_SESSION_FREED
;
792 * Check for iSCSI window and take care of CmdSN wrap-around
794 if ((int)(session
->max_cmdsn
- session
->cmdsn
) < 0) {
795 reason
= FAILURE_WINDOW_CLOSED
;
799 conn
= session
->leadconn
;
801 reason
= FAILURE_SESSION_FREED
;
805 if (!__kfifo_get(session
->cmdpool
.queue
, (void*)&ctask
,
807 reason
= FAILURE_OOM
;
810 sc
->SCp
.phase
= session
->age
;
811 sc
->SCp
.ptr
= (char *)ctask
;
813 atomic_set(&ctask
->refcount
, 1);
814 ctask
->state
= ISCSI_TASK_PENDING
;
818 INIT_LIST_HEAD(&ctask
->running
);
819 ctask
->total_length
= sc
->request_bufflen
;
820 iscsi_prep_scsi_cmd_pdu(ctask
);
822 session
->tt
->init_cmd_task(ctask
);
824 list_add_tail(&ctask
->running
, &conn
->xmitqueue
);
826 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
828 sc
->sc_data_direction
== DMA_TO_DEVICE
? "write" : "read",
829 conn
->id
, sc
, sc
->cmnd
[0], ctask
->itt
, sc
->request_bufflen
,
830 session
->cmdsn
, session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
831 spin_unlock(&session
->lock
);
833 scsi_queue_work(host
, &conn
->xmitwork
);
837 spin_unlock(&session
->lock
);
838 debug_scsi("cmd 0x%x rejected (%d)\n", sc
->cmnd
[0], reason
);
839 return SCSI_MLQUEUE_HOST_BUSY
;
842 spin_unlock(&session
->lock
);
843 printk(KERN_ERR
"iscsi: cmd 0x%x is not queued (%d)\n",
844 sc
->cmnd
[0], reason
);
845 sc
->result
= (DID_NO_CONNECT
<< 16);
846 sc
->resid
= sc
->request_bufflen
;
850 EXPORT_SYMBOL_GPL(iscsi_queuecommand
);
852 int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
)
854 if (depth
> ISCSI_MAX_CMD_PER_LUN
)
855 depth
= ISCSI_MAX_CMD_PER_LUN
;
856 scsi_adjust_queue_depth(sdev
, scsi_get_tag_type(sdev
), depth
);
857 return sdev
->queue_depth
;
859 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth
);
862 iscsi_conn_send_generic(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
863 char *data
, uint32_t data_size
)
865 struct iscsi_session
*session
= conn
->session
;
866 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
867 struct iscsi_mgmt_task
*mtask
;
869 spin_lock_bh(&session
->lock
);
870 if (session
->state
== ISCSI_STATE_TERMINATE
) {
871 spin_unlock_bh(&session
->lock
);
874 if (hdr
->opcode
== (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) ||
875 hdr
->opcode
== (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
877 * Login and Text are sent serially, in
878 * request-followed-by-response sequence.
879 * Same mtask can be used. Same ITT must be used.
880 * Note that login_mtask is preallocated at conn_create().
882 mtask
= conn
->login_mtask
;
884 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
885 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
887 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
888 if (!__kfifo_get(session
->mgmtpool
.queue
,
889 (void*)&mtask
, sizeof(void*))) {
890 spin_unlock_bh(&session
->lock
);
896 * pre-format CmdSN for outgoing PDU.
898 if (hdr
->itt
!= cpu_to_be32(ISCSI_RESERVED_TAG
)) {
899 hdr
->itt
= mtask
->itt
| (conn
->id
<< ISCSI_CID_SHIFT
) |
900 (session
->age
<< ISCSI_AGE_SHIFT
);
901 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
902 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
903 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
906 /* do not advance CmdSN */
907 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
910 memcpy(mtask
->data
, data
, data_size
);
911 mtask
->data_count
= data_size
;
913 mtask
->data_count
= 0;
915 INIT_LIST_HEAD(&mtask
->running
);
916 memcpy(mtask
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
917 if (session
->tt
->init_mgmt_task
)
918 session
->tt
->init_mgmt_task(conn
, mtask
, data
, data_size
);
919 spin_unlock_bh(&session
->lock
);
921 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
922 hdr
->opcode
, hdr
->itt
, data_size
);
925 * since send_pdu() could be called at least from two contexts,
926 * we need to serialize __kfifo_put, so we don't have to take
927 * additional lock on fast data-path
929 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
)
930 __kfifo_put(conn
->immqueue
, (void*)&mtask
, sizeof(void*));
932 __kfifo_put(conn
->mgmtqueue
, (void*)&mtask
, sizeof(void*));
934 scsi_queue_work(session
->host
, &conn
->xmitwork
);
938 int iscsi_conn_send_pdu(struct iscsi_cls_conn
*cls_conn
, struct iscsi_hdr
*hdr
,
939 char *data
, uint32_t data_size
)
941 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
944 mutex_lock(&conn
->xmitmutex
);
945 rc
= iscsi_conn_send_generic(conn
, hdr
, data
, data_size
);
946 mutex_unlock(&conn
->xmitmutex
);
950 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu
);
952 void iscsi_session_recovery_timedout(struct iscsi_cls_session
*cls_session
)
954 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
955 struct iscsi_conn
*conn
= session
->leadconn
;
957 spin_lock_bh(&session
->lock
);
958 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
959 session
->state
= ISCSI_STATE_RECOVERY_FAILED
;
961 wake_up(&conn
->ehwait
);
963 spin_unlock_bh(&session
->lock
);
965 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout
);
967 int iscsi_eh_host_reset(struct scsi_cmnd
*sc
)
969 struct Scsi_Host
*host
= sc
->device
->host
;
970 struct iscsi_session
*session
= iscsi_hostdata(host
->hostdata
);
971 struct iscsi_conn
*conn
= session
->leadconn
;
972 int fail_session
= 0;
974 spin_lock_bh(&session
->lock
);
975 if (session
->state
== ISCSI_STATE_TERMINATE
) {
977 debug_scsi("failing host reset: session terminated "
978 "[CID %d age %d]\n", conn
->id
, session
->age
);
979 spin_unlock_bh(&session
->lock
);
983 if (sc
->SCp
.phase
== session
->age
) {
984 debug_scsi("failing connection CID %d due to SCSI host reset\n",
988 spin_unlock_bh(&session
->lock
);
991 * we drop the lock here but the leadconn cannot be destoyed while
992 * we are in the scsi eh
995 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
997 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
998 wait_event_interruptible(conn
->ehwait
,
999 session
->state
== ISCSI_STATE_TERMINATE
||
1000 session
->state
== ISCSI_STATE_LOGGED_IN
||
1001 session
->state
== ISCSI_STATE_RECOVERY_FAILED
);
1002 if (signal_pending(current
))
1003 flush_signals(current
);
1005 spin_lock_bh(&session
->lock
);
1006 if (session
->state
== ISCSI_STATE_LOGGED_IN
)
1007 printk(KERN_INFO
"iscsi: host reset succeeded\n");
1010 spin_unlock_bh(&session
->lock
);
1014 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset
);
1016 static void iscsi_tmabort_timedout(unsigned long data
)
1018 struct iscsi_cmd_task
*ctask
= (struct iscsi_cmd_task
*)data
;
1019 struct iscsi_conn
*conn
= ctask
->conn
;
1020 struct iscsi_session
*session
= conn
->session
;
1022 spin_lock(&session
->lock
);
1023 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
1024 conn
->tmabort_state
= TMABORT_TIMEDOUT
;
1025 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1026 ctask
->sc
, ctask
->itt
);
1027 /* unblock eh_abort() */
1028 wake_up(&conn
->ehwait
);
1030 spin_unlock(&session
->lock
);
1033 /* must be called with the mutex lock */
1034 static int iscsi_exec_abort_task(struct scsi_cmnd
*sc
,
1035 struct iscsi_cmd_task
*ctask
)
1037 struct iscsi_conn
*conn
= ctask
->conn
;
1038 struct iscsi_session
*session
= conn
->session
;
1039 struct iscsi_tm
*hdr
= &conn
->tmhdr
;
1043 * ctask timed out but session is OK requests must be serialized.
1045 memset(hdr
, 0, sizeof(struct iscsi_tm
));
1046 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
1047 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
;
1048 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
1049 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
1050 hdr
->rtt
= ctask
->hdr
->itt
;
1051 hdr
->refcmdsn
= ctask
->hdr
->cmdsn
;
1053 rc
= iscsi_conn_send_generic(conn
, (struct iscsi_hdr
*)hdr
,
1056 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1057 debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask
->itt
,
1062 debug_scsi("abort sent [itt 0x%x]\n", ctask
->itt
);
1064 spin_lock_bh(&session
->lock
);
1065 ctask
->mtask
= (struct iscsi_mgmt_task
*)
1066 session
->mgmt_cmds
[(hdr
->itt
& ISCSI_ITT_MASK
) -
1067 ISCSI_MGMT_ITT_OFFSET
];
1069 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
1070 conn
->tmfcmd_pdus_cnt
++;
1071 conn
->tmabort_timer
.expires
= 10*HZ
+ jiffies
;
1072 conn
->tmabort_timer
.function
= iscsi_tmabort_timedout
;
1073 conn
->tmabort_timer
.data
= (unsigned long)ctask
;
1074 add_timer(&conn
->tmabort_timer
);
1075 debug_scsi("abort set timeout [itt 0x%x]\n", ctask
->itt
);
1077 spin_unlock_bh(&session
->lock
);
1078 mutex_unlock(&conn
->xmitmutex
);
1081 * block eh thread until:
1085 * 3) session is terminated or restarted or userspace has
1086 * given up on recovery
1088 wait_event_interruptible(conn
->ehwait
,
1089 sc
->SCp
.phase
!= session
->age
||
1090 session
->state
!= ISCSI_STATE_LOGGED_IN
||
1091 conn
->tmabort_state
!= TMABORT_INITIAL
);
1092 if (signal_pending(current
))
1093 flush_signals(current
);
1094 del_timer_sync(&conn
->tmabort_timer
);
1096 mutex_lock(&conn
->xmitmutex
);
1101 * xmit mutex and session lock must be held
1103 static struct iscsi_mgmt_task
*
1104 iscsi_remove_mgmt_task(struct kfifo
*fifo
, uint32_t itt
)
1106 int i
, nr_tasks
= __kfifo_len(fifo
) / sizeof(void*);
1107 struct iscsi_mgmt_task
*task
;
1109 debug_scsi("searching %d tasks\n", nr_tasks
);
1111 for (i
= 0; i
< nr_tasks
; i
++) {
1112 __kfifo_get(fifo
, (void*)&task
, sizeof(void*));
1113 debug_scsi("check task %u\n", task
->itt
);
1115 if (task
->itt
== itt
) {
1116 debug_scsi("matched task\n");
1120 __kfifo_put(fifo
, (void*)&task
, sizeof(void*));
1125 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task
*ctask
)
1127 struct iscsi_conn
*conn
= ctask
->conn
;
1128 struct iscsi_session
*session
= conn
->session
;
1133 if (!iscsi_remove_mgmt_task(conn
->immqueue
, ctask
->mtask
->itt
))
1134 list_del(&ctask
->mtask
->running
);
1135 __kfifo_put(session
->mgmtpool
.queue
, (void*)&ctask
->mtask
,
1137 ctask
->mtask
= NULL
;
1142 * session lock and xmitmutex must be held
1144 static void fail_command(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1147 struct scsi_cmnd
*sc
;
1153 conn
->session
->tt
->cleanup_cmd_task(conn
, ctask
);
1154 iscsi_ctask_mtask_cleanup(ctask
);
1157 sc
->resid
= sc
->request_bufflen
;
1158 /* release ref from queuecommand */
1159 __iscsi_put_ctask(ctask
);
1162 int iscsi_eh_abort(struct scsi_cmnd
*sc
)
1164 struct iscsi_cmd_task
*ctask
;
1165 struct iscsi_conn
*conn
;
1166 struct iscsi_session
*session
;
1170 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1174 debug_scsi("sc never reached iscsi layer or it completed.\n");
1178 ctask
= (struct iscsi_cmd_task
*)sc
->SCp
.ptr
;
1180 session
= conn
->session
;
1182 conn
->eh_abort_cnt
++;
1183 debug_scsi("aborting [sc %p itt 0x%x]\n", sc
, ctask
->itt
);
1185 mutex_lock(&conn
->xmitmutex
);
1186 spin_lock_bh(&session
->lock
);
1189 * If we are not logged in or we have started a new session
1190 * then let the host reset code handle this
1192 if (session
->state
!= ISCSI_STATE_LOGGED_IN
||
1193 sc
->SCp
.phase
!= session
->age
)
1196 /* ctask completed before time out */
1198 spin_unlock_bh(&session
->lock
);
1199 debug_scsi("sc completed while abort in progress\n");
1200 goto success_rel_mutex
;
1203 /* what should we do here ? */
1204 if (conn
->ctask
== ctask
) {
1205 printk(KERN_INFO
"iscsi: sc %p itt 0x%x partially sent. "
1206 "Failing abort\n", sc
, ctask
->itt
);
1210 if (ctask
->state
== ISCSI_TASK_PENDING
)
1211 goto success_cleanup
;
1213 conn
->tmabort_state
= TMABORT_INITIAL
;
1215 spin_unlock_bh(&session
->lock
);
1216 rc
= iscsi_exec_abort_task(sc
, ctask
);
1217 spin_lock_bh(&session
->lock
);
1219 if (rc
|| sc
->SCp
.phase
!= session
->age
||
1220 session
->state
!= ISCSI_STATE_LOGGED_IN
)
1222 iscsi_ctask_mtask_cleanup(ctask
);
1224 switch (conn
->tmabort_state
) {
1225 case TMABORT_SUCCESS
:
1226 goto success_cleanup
;
1227 case TMABORT_NOT_FOUND
:
1229 /* ctask completed before tmf abort response */
1230 spin_unlock_bh(&session
->lock
);
1231 debug_scsi("sc completed while abort in progress\n");
1232 goto success_rel_mutex
;
1236 /* timedout or failed */
1237 spin_unlock_bh(&session
->lock
);
1238 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1239 spin_lock_bh(&session
->lock
);
1244 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1245 spin_unlock_bh(&session
->lock
);
1248 * clean up task if aborted. we have the xmitmutex so grab
1249 * the recv lock as a writer
1251 write_lock_bh(conn
->recv_lock
);
1252 spin_lock(&session
->lock
);
1253 fail_command(conn
, ctask
, DID_ABORT
<< 16);
1254 spin_unlock(&session
->lock
);
1255 write_unlock_bh(conn
->recv_lock
);
1258 mutex_unlock(&conn
->xmitmutex
);
1262 spin_unlock_bh(&session
->lock
);
1263 mutex_unlock(&conn
->xmitmutex
);
1265 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
1268 EXPORT_SYMBOL_GPL(iscsi_eh_abort
);
1271 iscsi_pool_init(struct iscsi_queue
*q
, int max
, void ***items
, int item_size
)
1275 *items
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
1280 q
->pool
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
1281 if (q
->pool
== NULL
) {
1286 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
1288 if (q
->queue
== ERR_PTR(-ENOMEM
)) {
1294 for (i
= 0; i
< max
; i
++) {
1295 q
->pool
[i
] = kmalloc(item_size
, GFP_KERNEL
);
1296 if (q
->pool
[i
] == NULL
) {
1299 for (j
= 0; j
< i
; j
++)
1302 kfifo_free(q
->queue
);
1307 memset(q
->pool
[i
], 0, item_size
);
1308 (*items
)[i
] = q
->pool
[i
];
1309 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
1313 EXPORT_SYMBOL_GPL(iscsi_pool_init
);
1315 void iscsi_pool_free(struct iscsi_queue
*q
, void **items
)
1319 for (i
= 0; i
< q
->max
; i
++)
1324 EXPORT_SYMBOL_GPL(iscsi_pool_free
);
1327 * iSCSI Session's hostdata organization:
1329 * *------------------* <== hostdata_session(host->hostdata)
1330 * | ptr to class sess|
1331 * |------------------| <== iscsi_hostdata(host->hostdata)
1333 * *------------------*
1336 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1337 _sz % sizeof(unsigned long))
1339 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1342 * iscsi_session_setup - create iscsi cls session and host and session
1343 * @scsit: scsi transport template
1344 * @iscsit: iscsi transport template
1345 * @initial_cmdsn: initial CmdSN
1346 * @hostno: host no allocated
1348 * This can be used by software iscsi_transports that allocate
1349 * a session per scsi host.
1351 struct iscsi_cls_session
*
1352 iscsi_session_setup(struct iscsi_transport
*iscsit
,
1353 struct scsi_transport_template
*scsit
,
1354 int cmd_task_size
, int mgmt_task_size
,
1355 uint32_t initial_cmdsn
, uint32_t *hostno
)
1357 struct Scsi_Host
*shost
;
1358 struct iscsi_session
*session
;
1359 struct iscsi_cls_session
*cls_session
;
1362 shost
= scsi_host_alloc(iscsit
->host_template
,
1363 hostdata_privsize(sizeof(*session
)));
1368 shost
->max_channel
= 0;
1369 shost
->max_lun
= iscsit
->max_lun
;
1370 shost
->max_cmd_len
= iscsit
->max_cmd_len
;
1371 shost
->transportt
= scsit
;
1372 shost
->transportt
->create_work_queue
= 1;
1373 *hostno
= shost
->host_no
;
1375 session
= iscsi_hostdata(shost
->hostdata
);
1376 memset(session
, 0, sizeof(struct iscsi_session
));
1377 session
->host
= shost
;
1378 session
->state
= ISCSI_STATE_FREE
;
1379 session
->mgmtpool_max
= ISCSI_MGMT_CMDS_MAX
;
1380 session
->cmds_max
= ISCSI_XMIT_CMDS_MAX
;
1381 session
->cmdsn
= initial_cmdsn
;
1382 session
->exp_cmdsn
= initial_cmdsn
+ 1;
1383 session
->max_cmdsn
= initial_cmdsn
+ 1;
1384 session
->max_r2t
= 1;
1385 session
->tt
= iscsit
;
1387 /* initialize SCSI PDU commands pool */
1388 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
1389 (void***)&session
->cmds
,
1390 cmd_task_size
+ sizeof(struct iscsi_cmd_task
)))
1391 goto cmdpool_alloc_fail
;
1393 /* pre-format cmds pool with ITT */
1394 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
1395 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
1398 ctask
->dd_data
= &ctask
[1];
1400 INIT_LIST_HEAD(&ctask
->running
);
1403 spin_lock_init(&session
->lock
);
1405 /* initialize immediate command pool */
1406 if (iscsi_pool_init(&session
->mgmtpool
, session
->mgmtpool_max
,
1407 (void***)&session
->mgmt_cmds
,
1408 mgmt_task_size
+ sizeof(struct iscsi_mgmt_task
)))
1409 goto mgmtpool_alloc_fail
;
1412 /* pre-format immediate cmds pool with ITT */
1413 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++) {
1414 struct iscsi_mgmt_task
*mtask
= session
->mgmt_cmds
[cmd_i
];
1417 mtask
->dd_data
= &mtask
[1];
1418 mtask
->itt
= ISCSI_MGMT_ITT_OFFSET
+ cmd_i
;
1419 INIT_LIST_HEAD(&mtask
->running
);
1422 if (scsi_add_host(shost
, NULL
))
1425 if (!try_module_get(iscsit
->owner
))
1426 goto cls_session_fail
;
1428 cls_session
= iscsi_create_session(shost
, iscsit
, 0);
1431 *(unsigned long*)shost
->hostdata
= (unsigned long)cls_session
;
1436 module_put(iscsit
->owner
);
1438 scsi_remove_host(shost
);
1440 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
1441 mgmtpool_alloc_fail
:
1442 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
1444 scsi_host_put(shost
);
1447 EXPORT_SYMBOL_GPL(iscsi_session_setup
);
1450 * iscsi_session_teardown - destroy session, host, and cls_session
1453 * This can be used by software iscsi_transports that allocate
1454 * a session per scsi host.
1456 void iscsi_session_teardown(struct iscsi_cls_session
*cls_session
)
1458 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1459 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1460 struct module
*owner
= cls_session
->transport
->owner
;
1462 scsi_remove_host(shost
);
1464 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
1465 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
1467 kfree(session
->targetname
);
1469 iscsi_destroy_session(cls_session
);
1470 scsi_host_put(shost
);
1473 EXPORT_SYMBOL_GPL(iscsi_session_teardown
);
1476 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1477 * @cls_session: iscsi_cls_session
1480 struct iscsi_cls_conn
*
1481 iscsi_conn_setup(struct iscsi_cls_session
*cls_session
, uint32_t conn_idx
)
1483 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1484 struct iscsi_conn
*conn
;
1485 struct iscsi_cls_conn
*cls_conn
;
1488 cls_conn
= iscsi_create_conn(cls_session
, conn_idx
);
1491 conn
= cls_conn
->dd_data
;
1492 memset(conn
, 0, sizeof(*conn
));
1494 conn
->session
= session
;
1495 conn
->cls_conn
= cls_conn
;
1496 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
1497 conn
->id
= conn_idx
;
1498 conn
->exp_statsn
= 0;
1499 conn
->tmabort_state
= TMABORT_INITIAL
;
1500 INIT_LIST_HEAD(&conn
->run_list
);
1501 INIT_LIST_HEAD(&conn
->mgmt_run_list
);
1502 INIT_LIST_HEAD(&conn
->xmitqueue
);
1504 /* initialize general immediate & non-immediate PDU commands queue */
1505 conn
->immqueue
= kfifo_alloc(session
->mgmtpool_max
* sizeof(void*),
1507 if (conn
->immqueue
== ERR_PTR(-ENOMEM
))
1508 goto immqueue_alloc_fail
;
1510 conn
->mgmtqueue
= kfifo_alloc(session
->mgmtpool_max
* sizeof(void*),
1512 if (conn
->mgmtqueue
== ERR_PTR(-ENOMEM
))
1513 goto mgmtqueue_alloc_fail
;
1515 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
, conn
);
1517 /* allocate login_mtask used for the login/text sequences */
1518 spin_lock_bh(&session
->lock
);
1519 if (!__kfifo_get(session
->mgmtpool
.queue
,
1520 (void*)&conn
->login_mtask
,
1522 spin_unlock_bh(&session
->lock
);
1523 goto login_mtask_alloc_fail
;
1525 spin_unlock_bh(&session
->lock
);
1527 data
= kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH
, GFP_KERNEL
);
1529 goto login_mtask_data_alloc_fail
;
1530 conn
->login_mtask
->data
= conn
->data
= data
;
1532 init_timer(&conn
->tmabort_timer
);
1533 mutex_init(&conn
->xmitmutex
);
1534 init_waitqueue_head(&conn
->ehwait
);
1538 login_mtask_data_alloc_fail
:
1539 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1541 login_mtask_alloc_fail
:
1542 kfifo_free(conn
->mgmtqueue
);
1543 mgmtqueue_alloc_fail
:
1544 kfifo_free(conn
->immqueue
);
1545 immqueue_alloc_fail
:
1546 iscsi_destroy_conn(cls_conn
);
1549 EXPORT_SYMBOL_GPL(iscsi_conn_setup
);
1552 * iscsi_conn_teardown - teardown iscsi connection
1553 * cls_conn: iscsi class connection
1555 * TODO: we may need to make this into a two step process
1556 * like scsi-mls remove + put host
1558 void iscsi_conn_teardown(struct iscsi_cls_conn
*cls_conn
)
1560 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1561 struct iscsi_session
*session
= conn
->session
;
1562 unsigned long flags
;
1564 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1565 mutex_lock(&conn
->xmitmutex
);
1567 spin_lock_bh(&session
->lock
);
1568 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
1569 if (session
->leadconn
== conn
) {
1571 * leading connection? then give up on recovery.
1573 session
->state
= ISCSI_STATE_TERMINATE
;
1574 wake_up(&conn
->ehwait
);
1576 spin_unlock_bh(&session
->lock
);
1578 mutex_unlock(&conn
->xmitmutex
);
1581 * Block until all in-progress commands for this connection
1585 spin_lock_irqsave(session
->host
->host_lock
, flags
);
1586 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
1587 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1590 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
1591 msleep_interruptible(500);
1592 printk(KERN_INFO
"iscsi: scsi conn_destroy(): host_busy %d "
1593 "host_failed %d\n", session
->host
->host_busy
,
1594 session
->host
->host_failed
);
1596 * force eh_abort() to unblock
1598 wake_up(&conn
->ehwait
);
1601 spin_lock_bh(&session
->lock
);
1603 kfree(conn
->persistent_address
);
1604 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
1606 if (session
->leadconn
== conn
) {
1607 session
->leadconn
= NULL
;
1608 /* no connections exits.. reset sequencing */
1609 session
->cmdsn
= session
->max_cmdsn
= session
->exp_cmdsn
= 1;
1611 spin_unlock_bh(&session
->lock
);
1613 kfifo_free(conn
->immqueue
);
1614 kfifo_free(conn
->mgmtqueue
);
1616 iscsi_destroy_conn(cls_conn
);
1618 EXPORT_SYMBOL_GPL(iscsi_conn_teardown
);
1620 int iscsi_conn_start(struct iscsi_cls_conn
*cls_conn
)
1622 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1623 struct iscsi_session
*session
= conn
->session
;
1626 printk(KERN_ERR
"iscsi: can't start unbound connection\n");
1630 if ((session
->imm_data_en
|| !session
->initial_r2t_en
) &&
1631 session
->first_burst
> session
->max_burst
) {
1632 printk("iscsi: invalid burst lengths: "
1633 "first_burst %d max_burst %d\n",
1634 session
->first_burst
, session
->max_burst
);
1638 spin_lock_bh(&session
->lock
);
1639 conn
->c_stage
= ISCSI_CONN_STARTED
;
1640 session
->state
= ISCSI_STATE_LOGGED_IN
;
1642 switch(conn
->stop_stage
) {
1643 case STOP_CONN_RECOVER
:
1645 * unblock eh_abort() if it is blocked. re-try all
1646 * commands after successful recovery
1648 conn
->stop_stage
= 0;
1649 conn
->tmabort_state
= TMABORT_INITIAL
;
1651 spin_unlock_bh(&session
->lock
);
1653 iscsi_unblock_session(session_to_cls(session
));
1654 wake_up(&conn
->ehwait
);
1656 case STOP_CONN_TERM
:
1657 conn
->stop_stage
= 0;
1662 spin_unlock_bh(&session
->lock
);
1666 EXPORT_SYMBOL_GPL(iscsi_conn_start
);
1669 flush_control_queues(struct iscsi_session
*session
, struct iscsi_conn
*conn
)
1671 struct iscsi_mgmt_task
*mtask
, *tmp
;
1673 /* handle pending */
1674 while (__kfifo_get(conn
->immqueue
, (void*)&mtask
, sizeof(void*)) ||
1675 __kfifo_get(conn
->mgmtqueue
, (void*)&mtask
, sizeof(void*))) {
1676 if (mtask
== conn
->login_mtask
)
1678 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask
->itt
);
1679 __kfifo_put(session
->mgmtpool
.queue
, (void*)&mtask
,
1683 /* handle running */
1684 list_for_each_entry_safe(mtask
, tmp
, &conn
->mgmt_run_list
, running
) {
1685 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask
->itt
);
1686 list_del(&mtask
->running
);
1688 if (mtask
== conn
->login_mtask
)
1690 __kfifo_put(session
->mgmtpool
.queue
, (void*)&mtask
,
1697 /* Fail commands. Mutex and session lock held and recv side suspended */
1698 static void fail_all_commands(struct iscsi_conn
*conn
)
1700 struct iscsi_cmd_task
*ctask
, *tmp
;
1703 list_for_each_entry_safe(ctask
, tmp
, &conn
->xmitqueue
, running
) {
1704 debug_scsi("failing pending sc %p itt 0x%x\n", ctask
->sc
,
1706 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1709 /* fail all other running */
1710 list_for_each_entry_safe(ctask
, tmp
, &conn
->run_list
, running
) {
1711 debug_scsi("failing in progress sc %p itt 0x%x\n",
1712 ctask
->sc
, ctask
->itt
);
1713 fail_command(conn
, ctask
, DID_BUS_BUSY
<< 16);
1719 static void iscsi_start_session_recovery(struct iscsi_session
*session
,
1720 struct iscsi_conn
*conn
, int flag
)
1724 spin_lock_bh(&session
->lock
);
1725 if (conn
->stop_stage
== STOP_CONN_TERM
) {
1726 spin_unlock_bh(&session
->lock
);
1731 * When this is called for the in_login state, we only want to clean
1732 * up the login task and connection. We do not need to block and set
1733 * the recovery state again
1735 if (flag
== STOP_CONN_TERM
)
1736 session
->state
= ISCSI_STATE_TERMINATE
;
1737 else if (conn
->stop_stage
!= STOP_CONN_RECOVER
)
1738 session
->state
= ISCSI_STATE_IN_RECOVERY
;
1740 old_stop_stage
= conn
->stop_stage
;
1741 conn
->stop_stage
= flag
;
1742 conn
->c_stage
= ISCSI_CONN_STOPPED
;
1743 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1744 spin_unlock_bh(&session
->lock
);
1746 write_lock_bh(conn
->recv_lock
);
1747 set_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1748 write_unlock_bh(conn
->recv_lock
);
1750 mutex_lock(&conn
->xmitmutex
);
1752 * for connection level recovery we should not calculate
1753 * header digest. conn->hdr_size used for optimization
1754 * in hdr_extract() and will be re-negotiated at
1757 if (flag
== STOP_CONN_RECOVER
) {
1758 conn
->hdrdgst_en
= 0;
1759 conn
->datadgst_en
= 0;
1760 if (session
->state
== ISCSI_STATE_IN_RECOVERY
&&
1761 old_stop_stage
!= STOP_CONN_RECOVER
) {
1762 debug_scsi("blocking session\n");
1763 iscsi_block_session(session_to_cls(session
));
1770 spin_lock_bh(&session
->lock
);
1771 fail_all_commands(conn
);
1772 flush_control_queues(session
, conn
);
1773 spin_unlock_bh(&session
->lock
);
1775 mutex_unlock(&conn
->xmitmutex
);
1778 void iscsi_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
1780 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1781 struct iscsi_session
*session
= conn
->session
;
1784 case STOP_CONN_RECOVER
:
1785 case STOP_CONN_TERM
:
1786 iscsi_start_session_recovery(session
, conn
, flag
);
1789 printk(KERN_ERR
"iscsi: invalid stop flag %d\n", flag
);
1792 EXPORT_SYMBOL_GPL(iscsi_conn_stop
);
1794 int iscsi_conn_bind(struct iscsi_cls_session
*cls_session
,
1795 struct iscsi_cls_conn
*cls_conn
, int is_leading
)
1797 struct iscsi_session
*session
= class_to_transport_session(cls_session
);
1798 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1800 spin_lock_bh(&session
->lock
);
1802 session
->leadconn
= conn
;
1803 spin_unlock_bh(&session
->lock
);
1806 * Unblock xmitworker(), Login Phase will pass through.
1808 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_rx
);
1809 clear_bit(ISCSI_SUSPEND_BIT
, &conn
->suspend_tx
);
1812 EXPORT_SYMBOL_GPL(iscsi_conn_bind
);
1815 int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
1816 enum iscsi_param param
, char *buf
, int buflen
)
1818 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1819 struct iscsi_session
*session
= conn
->session
;
1823 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
1824 sscanf(buf
, "%d", &conn
->max_recv_dlength
);
1826 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
1827 sscanf(buf
, "%d", &conn
->max_xmit_dlength
);
1829 case ISCSI_PARAM_HDRDGST_EN
:
1830 sscanf(buf
, "%d", &conn
->hdrdgst_en
);
1832 case ISCSI_PARAM_DATADGST_EN
:
1833 sscanf(buf
, "%d", &conn
->datadgst_en
);
1835 case ISCSI_PARAM_INITIAL_R2T_EN
:
1836 sscanf(buf
, "%d", &session
->initial_r2t_en
);
1838 case ISCSI_PARAM_MAX_R2T
:
1839 sscanf(buf
, "%d", &session
->max_r2t
);
1841 case ISCSI_PARAM_IMM_DATA_EN
:
1842 sscanf(buf
, "%d", &session
->imm_data_en
);
1844 case ISCSI_PARAM_FIRST_BURST
:
1845 sscanf(buf
, "%d", &session
->first_burst
);
1847 case ISCSI_PARAM_MAX_BURST
:
1848 sscanf(buf
, "%d", &session
->max_burst
);
1850 case ISCSI_PARAM_PDU_INORDER_EN
:
1851 sscanf(buf
, "%d", &session
->pdu_inorder_en
);
1853 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
1854 sscanf(buf
, "%d", &session
->dataseq_inorder_en
);
1856 case ISCSI_PARAM_ERL
:
1857 sscanf(buf
, "%d", &session
->erl
);
1859 case ISCSI_PARAM_IFMARKER_EN
:
1860 sscanf(buf
, "%d", &value
);
1863 case ISCSI_PARAM_OFMARKER_EN
:
1864 sscanf(buf
, "%d", &value
);
1867 case ISCSI_PARAM_EXP_STATSN
:
1868 sscanf(buf
, "%u", &conn
->exp_statsn
);
1870 case ISCSI_PARAM_TARGET_NAME
:
1871 /* this should not change between logins */
1872 if (session
->targetname
)
1875 session
->targetname
= kstrdup(buf
, GFP_KERNEL
);
1876 if (!session
->targetname
)
1879 case ISCSI_PARAM_TPGT
:
1880 sscanf(buf
, "%d", &session
->tpgt
);
1882 case ISCSI_PARAM_PERSISTENT_PORT
:
1883 sscanf(buf
, "%d", &conn
->persistent_port
);
1885 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
1887 * this is the address returned in discovery so it should
1888 * not change between logins.
1890 if (conn
->persistent_address
)
1893 conn
->persistent_address
= kstrdup(buf
, GFP_KERNEL
);
1894 if (!conn
->persistent_address
)
1903 EXPORT_SYMBOL_GPL(iscsi_set_param
);
1905 int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
1906 enum iscsi_param param
, char *buf
)
1908 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
1909 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
1913 case ISCSI_PARAM_INITIAL_R2T_EN
:
1914 len
= sprintf(buf
, "%d\n", session
->initial_r2t_en
);
1916 case ISCSI_PARAM_MAX_R2T
:
1917 len
= sprintf(buf
, "%hu\n", session
->max_r2t
);
1919 case ISCSI_PARAM_IMM_DATA_EN
:
1920 len
= sprintf(buf
, "%d\n", session
->imm_data_en
);
1922 case ISCSI_PARAM_FIRST_BURST
:
1923 len
= sprintf(buf
, "%u\n", session
->first_burst
);
1925 case ISCSI_PARAM_MAX_BURST
:
1926 len
= sprintf(buf
, "%u\n", session
->max_burst
);
1928 case ISCSI_PARAM_PDU_INORDER_EN
:
1929 len
= sprintf(buf
, "%d\n", session
->pdu_inorder_en
);
1931 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
1932 len
= sprintf(buf
, "%d\n", session
->dataseq_inorder_en
);
1934 case ISCSI_PARAM_ERL
:
1935 len
= sprintf(buf
, "%d\n", session
->erl
);
1937 case ISCSI_PARAM_TARGET_NAME
:
1938 len
= sprintf(buf
, "%s\n", session
->targetname
);
1940 case ISCSI_PARAM_TPGT
:
1941 len
= sprintf(buf
, "%d\n", session
->tpgt
);
1949 EXPORT_SYMBOL_GPL(iscsi_session_get_param
);
1951 int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
1952 enum iscsi_param param
, char *buf
)
1954 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1958 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
1959 len
= sprintf(buf
, "%u\n", conn
->max_recv_dlength
);
1961 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
1962 len
= sprintf(buf
, "%u\n", conn
->max_xmit_dlength
);
1964 case ISCSI_PARAM_HDRDGST_EN
:
1965 len
= sprintf(buf
, "%d\n", conn
->hdrdgst_en
);
1967 case ISCSI_PARAM_DATADGST_EN
:
1968 len
= sprintf(buf
, "%d\n", conn
->datadgst_en
);
1970 case ISCSI_PARAM_IFMARKER_EN
:
1971 len
= sprintf(buf
, "%d\n", conn
->ifmarker_en
);
1973 case ISCSI_PARAM_OFMARKER_EN
:
1974 len
= sprintf(buf
, "%d\n", conn
->ofmarker_en
);
1976 case ISCSI_PARAM_EXP_STATSN
:
1977 len
= sprintf(buf
, "%u\n", conn
->exp_statsn
);
1979 case ISCSI_PARAM_PERSISTENT_PORT
:
1980 len
= sprintf(buf
, "%d\n", conn
->persistent_port
);
1982 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
1983 len
= sprintf(buf
, "%s\n", conn
->persistent_address
);
1991 EXPORT_SYMBOL_GPL(iscsi_conn_get_param
);
1993 MODULE_AUTHOR("Mike Christie");
1994 MODULE_DESCRIPTION("iSCSI library functions");
1995 MODULE_LICENSE("GPL");