2 * iSCSI Initiator over TCP/IP Data-Path
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 Mike Christie
7 * maintained by open-iscsi@googlegroups.com
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published
11 * by the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * See the file COPYING included with this distribution for more details.
28 #include <linux/types.h>
29 #include <linux/list.h>
30 #include <linux/inet.h>
31 #include <linux/blkdev.h>
32 #include <linux/crypto.h>
33 #include <linux/delay.h>
34 #include <linux/kfifo.h>
35 #include <linux/scatterlist.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <scsi/scsi_device.h>
39 #include <scsi/scsi_eh.h>
40 #include <scsi/scsi_request.h>
41 #include <scsi/scsi_tcq.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_transport_iscsi.h>
46 #include "iscsi_tcp.h"
48 MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
49 "Alex Aizman <itn780@yahoo.com>");
50 MODULE_DESCRIPTION("iSCSI/TCP data-path");
51 MODULE_LICENSE("GPL");
53 /* #define DEBUG_TCP */
54 /* #define DEBUG_SCSI */
58 #define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt)
60 #define debug_tcp(fmt...)
64 #define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt)
66 #define debug_scsi(fmt...)
76 #define INVALID_SN_DELTA 0xffff
78 static unsigned int iscsi_max_lun
= 512;
79 module_param_named(max_lun
, iscsi_max_lun
, uint
, S_IRUGO
);
82 static kmem_cache_t
*taskcache
;
85 iscsi_buf_init_virt(struct iscsi_buf
*ibuf
, char *vbuf
, int size
)
87 sg_init_one(&ibuf
->sg
, (u8
*)vbuf
, size
);
92 iscsi_buf_init_iov(struct iscsi_buf
*ibuf
, char *vbuf
, int size
)
94 ibuf
->sg
.page
= (void*)vbuf
;
95 ibuf
->sg
.offset
= (unsigned int)-1;
96 ibuf
->sg
.length
= size
;
101 iscsi_buf_iov_base(struct iscsi_buf
*ibuf
)
103 return (char*)ibuf
->sg
.page
+ ibuf
->sent
;
107 iscsi_buf_init_sg(struct iscsi_buf
*ibuf
, struct scatterlist
*sg
)
110 * Fastpath: sg element fits into single page
112 if (sg
->length
+ sg
->offset
<= PAGE_SIZE
&& page_count(sg
->page
) >= 2) {
113 ibuf
->sg
.page
= sg
->page
;
114 ibuf
->sg
.offset
= sg
->offset
;
115 ibuf
->sg
.length
= sg
->length
;
117 iscsi_buf_init_iov(ibuf
, page_address(sg
->page
), sg
->length
);
122 iscsi_buf_left(struct iscsi_buf
*ibuf
)
126 rc
= ibuf
->sg
.length
- ibuf
->sent
;
132 iscsi_hdr_digest(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
,
135 crypto_digest_digest(conn
->tx_tfm
, &buf
->sg
, 1, crc
);
136 buf
->sg
.length
+= sizeof(uint32_t);
140 iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
)
142 struct iscsi_session
*session
= conn
->session
;
145 spin_lock_irqsave(&session
->lock
, flags
);
146 if (session
->conn_cnt
== 1 || session
->leadconn
== conn
)
147 session
->state
= ISCSI_STATE_FAILED
;
148 spin_unlock_irqrestore(&session
->lock
, flags
);
149 set_bit(SUSPEND_BIT
, &conn
->suspend_tx
);
150 set_bit(SUSPEND_BIT
, &conn
->suspend_rx
);
151 iscsi_conn_error(iscsi_handle(conn
), err
);
155 iscsi_check_assign_cmdsn(struct iscsi_session
*session
, struct iscsi_nopin
*hdr
)
157 uint32_t max_cmdsn
= be32_to_cpu(hdr
->max_cmdsn
);
158 uint32_t exp_cmdsn
= be32_to_cpu(hdr
->exp_cmdsn
);
160 if (max_cmdsn
< exp_cmdsn
-1 &&
161 max_cmdsn
> exp_cmdsn
- INVALID_SN_DELTA
)
162 return ISCSI_ERR_MAX_CMDSN
;
163 if (max_cmdsn
> session
->max_cmdsn
||
164 max_cmdsn
< session
->max_cmdsn
- INVALID_SN_DELTA
)
165 session
->max_cmdsn
= max_cmdsn
;
166 if (exp_cmdsn
> session
->exp_cmdsn
||
167 exp_cmdsn
< session
->exp_cmdsn
- INVALID_SN_DELTA
)
168 session
->exp_cmdsn
= exp_cmdsn
;
174 iscsi_hdr_extract(struct iscsi_conn
*conn
)
176 struct sk_buff
*skb
= conn
->in
.skb
;
178 if (conn
->in
.copy
>= conn
->hdr_size
&&
179 conn
->in_progress
== IN_PROGRESS_WAIT_HEADER
) {
181 * Zero-copy PDU Header: using connection context
182 * to store header pointer.
184 if (skb_shinfo(skb
)->frag_list
== NULL
&&
185 !skb_shinfo(skb
)->nr_frags
)
186 conn
->in
.hdr
= (struct iscsi_hdr
*)
187 ((char*)skb
->data
+ conn
->in
.offset
);
189 /* ignoring return code since we checked
191 skb_copy_bits(skb
, conn
->in
.offset
,
192 &conn
->hdr
, conn
->hdr_size
);
193 conn
->in
.hdr
= &conn
->hdr
;
195 conn
->in
.offset
+= conn
->hdr_size
;
196 conn
->in
.copy
-= conn
->hdr_size
;
202 * PDU header scattered across SKB's,
203 * copying it... This'll happen quite rarely.
206 if (conn
->in_progress
== IN_PROGRESS_WAIT_HEADER
)
207 conn
->in
.hdr_offset
= 0;
209 hdr_remains
= conn
->hdr_size
- conn
->in
.hdr_offset
;
210 BUG_ON(hdr_remains
<= 0);
212 copylen
= min(conn
->in
.copy
, hdr_remains
);
213 skb_copy_bits(skb
, conn
->in
.offset
,
214 (char*)&conn
->hdr
+ conn
->in
.hdr_offset
, copylen
);
216 debug_tcp("PDU gather offset %d bytes %d in.offset %d "
217 "in.copy %d\n", conn
->in
.hdr_offset
, copylen
,
218 conn
->in
.offset
, conn
->in
.copy
);
220 conn
->in
.offset
+= copylen
;
221 conn
->in
.copy
-= copylen
;
222 if (copylen
< hdr_remains
) {
223 conn
->in_progress
= IN_PROGRESS_HEADER_GATHER
;
224 conn
->in
.hdr_offset
+= copylen
;
227 conn
->in
.hdr
= &conn
->hdr
;
228 conn
->discontiguous_hdr_cnt
++;
229 conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
236 iscsi_ctask_cleanup(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
238 struct scsi_cmnd
*sc
= ctask
->sc
;
239 struct iscsi_session
*session
= conn
->session
;
241 spin_lock(&session
->lock
);
243 spin_unlock(&session
->lock
);
246 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
247 struct iscsi_data_task
*dtask
, *n
;
248 /* WRITE: cleanup Data-Out's if any */
249 spin_lock(&conn
->lock
);
250 list_for_each_entry_safe(dtask
, n
, &ctask
->dataqueue
, item
) {
251 list_del(&dtask
->item
);
252 mempool_free(dtask
, ctask
->datapool
);
254 spin_unlock(&conn
->lock
);
256 ctask
->xmstate
= XMSTATE_IDLE
;
259 __kfifo_put(session
->cmdpool
.queue
, (void*)&ctask
, sizeof(void*));
260 spin_unlock(&session
->lock
);
264 * iscsi_cmd_rsp - SCSI Command Response processing
265 * @conn: iscsi connection
266 * @ctask: scsi command task
269 iscsi_cmd_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
272 struct iscsi_cmd_rsp
*rhdr
= (struct iscsi_cmd_rsp
*)conn
->in
.hdr
;
273 struct iscsi_session
*session
= conn
->session
;
274 struct scsi_cmnd
*sc
= ctask
->sc
;
276 rc
= iscsi_check_assign_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
278 sc
->result
= (DID_ERROR
<< 16);
282 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
284 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
286 if (rhdr
->response
!= ISCSI_STATUS_CMD_COMPLETED
) {
287 sc
->result
= (DID_ERROR
<< 16);
291 if (rhdr
->cmd_status
== SAM_STAT_CHECK_CONDITION
&& conn
->senselen
) {
292 int sensecopy
= min(conn
->senselen
, SCSI_SENSE_BUFFERSIZE
);
294 memcpy(sc
->sense_buffer
, conn
->data
+ 2, sensecopy
);
295 debug_scsi("copied %d bytes of sense\n", sensecopy
);
298 if (sc
->sc_data_direction
== DMA_TO_DEVICE
)
301 if (rhdr
->flags
& ISCSI_FLAG_CMD_UNDERFLOW
) {
302 int res_count
= be32_to_cpu(rhdr
->residual_count
);
304 if (res_count
> 0 && res_count
<= sc
->request_bufflen
)
305 sc
->resid
= res_count
;
307 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
308 } else if (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_UNDERFLOW
)
309 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
310 else if (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
)
311 sc
->resid
= be32_to_cpu(rhdr
->residual_count
);
314 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
315 (long)sc
, sc
->result
, ctask
->itt
);
316 conn
->scsirsp_pdus_cnt
++;
317 iscsi_ctask_cleanup(conn
, ctask
);
323 * iscsi_data_rsp - SCSI Data-In Response processing
324 * @conn: iscsi connection
325 * @ctask: scsi command task
328 iscsi_data_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
331 struct iscsi_data_rsp
*rhdr
= (struct iscsi_data_rsp
*)conn
->in
.hdr
;
332 struct iscsi_session
*session
= conn
->session
;
333 int datasn
= be32_to_cpu(rhdr
->datasn
);
335 rc
= iscsi_check_assign_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
339 * setup Data-In byte counter (gets decremented..)
341 ctask
->data_count
= conn
->in
.datalen
;
343 if (conn
->in
.datalen
== 0)
346 if (ctask
->datasn
!= datasn
)
347 return ISCSI_ERR_DATASN
;
351 ctask
->data_offset
= be32_to_cpu(rhdr
->offset
);
352 if (ctask
->data_offset
+ conn
->in
.datalen
> ctask
->total_length
)
353 return ISCSI_ERR_DATA_OFFSET
;
355 if (rhdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
356 struct scsi_cmnd
*sc
= ctask
->sc
;
358 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
359 if (rhdr
->flags
& ISCSI_FLAG_CMD_UNDERFLOW
) {
360 int res_count
= be32_to_cpu(rhdr
->residual_count
);
363 res_count
<= sc
->request_bufflen
) {
364 sc
->resid
= res_count
;
365 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
367 sc
->result
= (DID_BAD_TARGET
<< 16) |
369 } else if (rhdr
->flags
& ISCSI_FLAG_CMD_BIDI_UNDERFLOW
)
370 sc
->result
= (DID_BAD_TARGET
<< 16) | rhdr
->cmd_status
;
371 else if (rhdr
->flags
& ISCSI_FLAG_CMD_OVERFLOW
) {
372 sc
->resid
= be32_to_cpu(rhdr
->residual_count
);
373 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
375 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
378 conn
->datain_pdus_cnt
++;
383 * iscsi_solicit_data_init - initialize first Data-Out
384 * @conn: iscsi connection
385 * @ctask: scsi command task
389 * Initialize first Data-Out within this R2T sequence and finds
390 * proper data_offset within this SCSI command.
392 * This function is called with connection lock taken.
395 iscsi_solicit_data_init(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
396 struct iscsi_r2t_info
*r2t
)
398 struct iscsi_data
*hdr
;
399 struct iscsi_data_task
*dtask
;
400 struct scsi_cmnd
*sc
= ctask
->sc
;
402 dtask
= mempool_alloc(ctask
->datapool
, GFP_ATOMIC
);
405 memset(hdr
, 0, sizeof(struct iscsi_data
));
407 hdr
->datasn
= cpu_to_be32(r2t
->solicit_datasn
);
408 r2t
->solicit_datasn
++;
409 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
410 memcpy(hdr
->lun
, ctask
->hdr
.lun
, sizeof(hdr
->lun
));
411 hdr
->itt
= ctask
->hdr
.itt
;
412 hdr
->exp_statsn
= r2t
->exp_statsn
;
413 hdr
->offset
= cpu_to_be32(r2t
->data_offset
);
414 if (r2t
->data_length
> conn
->max_xmit_dlength
) {
415 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
416 r2t
->data_count
= conn
->max_xmit_dlength
;
419 hton24(hdr
->dlength
, r2t
->data_length
);
420 r2t
->data_count
= r2t
->data_length
;
421 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
423 conn
->dataout_pdus_cnt
++;
427 iscsi_buf_init_virt(&r2t
->headbuf
, (char*)hdr
,
428 sizeof(struct iscsi_hdr
));
434 struct scatterlist
*sg
= sc
->request_buffer
;
437 for (i
= 0; i
< sc
->use_sg
; i
++, sg
+= 1) {
438 /* FIXME: prefetch ? */
439 if (sg_count
+ sg
->length
> r2t
->data_offset
) {
444 /* offset within this page */
445 page_offset
= r2t
->data_offset
- sg_count
;
447 /* fill in this buffer */
448 iscsi_buf_init_sg(&r2t
->sendbuf
, sg
);
449 r2t
->sendbuf
.sg
.offset
+= page_offset
;
450 r2t
->sendbuf
.sg
.length
-= page_offset
;
452 /* xmit logic will continue with next one */
456 sg_count
+= sg
->length
;
458 BUG_ON(r2t
->sg
== NULL
);
460 iscsi_buf_init_iov(&ctask
->sendbuf
,
461 (char*)sc
->request_buffer
+ r2t
->data_offset
,
464 list_add(&dtask
->item
, &ctask
->dataqueue
);
468 * iscsi_r2t_rsp - iSCSI R2T Response processing
469 * @conn: iscsi connection
470 * @ctask: scsi command task
473 iscsi_r2t_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
475 struct iscsi_r2t_info
*r2t
;
476 struct iscsi_session
*session
= conn
->session
;
477 struct iscsi_r2t_rsp
*rhdr
= (struct iscsi_r2t_rsp
*)conn
->in
.hdr
;
478 int r2tsn
= be32_to_cpu(rhdr
->r2tsn
);
482 return ISCSI_ERR_AHSLEN
;
484 if (conn
->in
.datalen
)
485 return ISCSI_ERR_DATALEN
;
487 if (ctask
->exp_r2tsn
&& ctask
->exp_r2tsn
!= r2tsn
)
488 return ISCSI_ERR_R2TSN
;
490 rc
= iscsi_check_assign_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
494 /* FIXME: use R2TSN to detect missing R2T */
496 /* fill-in new R2T associated with the task */
497 spin_lock(&session
->lock
);
498 if (!ctask
->sc
|| ctask
->mtask
||
499 session
->state
!= ISCSI_STATE_LOGGED_IN
) {
500 printk(KERN_INFO
"iscsi_tcp: dropping R2T itt %d in "
501 "recovery...\n", ctask
->itt
);
502 spin_unlock(&session
->lock
);
505 rc
= __kfifo_get(ctask
->r2tpool
.queue
, (void*)&r2t
, sizeof(void*));
508 r2t
->exp_statsn
= rhdr
->statsn
;
509 r2t
->data_length
= be32_to_cpu(rhdr
->data_length
);
510 if (r2t
->data_length
== 0 ||
511 r2t
->data_length
> session
->max_burst
) {
512 spin_unlock(&session
->lock
);
513 return ISCSI_ERR_DATALEN
;
516 r2t
->data_offset
= be32_to_cpu(rhdr
->data_offset
);
517 if (r2t
->data_offset
+ r2t
->data_length
> ctask
->total_length
) {
518 spin_unlock(&session
->lock
);
519 return ISCSI_ERR_DATALEN
;
522 r2t
->ttt
= rhdr
->ttt
; /* no flip */
523 r2t
->solicit_datasn
= 0;
525 iscsi_solicit_data_init(conn
, ctask
, r2t
);
527 ctask
->exp_r2tsn
= r2tsn
+ 1;
528 ctask
->xmstate
|= XMSTATE_SOL_HDR
;
529 __kfifo_put(ctask
->r2tqueue
, (void*)&r2t
, sizeof(void*));
530 __kfifo_put(conn
->writequeue
, (void*)&ctask
, sizeof(void*));
532 schedule_work(&conn
->xmitwork
);
533 conn
->r2t_pdus_cnt
++;
534 spin_unlock(&session
->lock
);
540 iscsi_hdr_recv(struct iscsi_conn
*conn
)
543 struct iscsi_hdr
*hdr
;
544 struct iscsi_cmd_task
*ctask
;
545 struct iscsi_session
*session
= conn
->session
;
546 uint32_t cdgst
, rdgst
= 0;
550 /* verify PDU length */
551 conn
->in
.datalen
= ntoh24(hdr
->dlength
);
552 if (conn
->in
.datalen
> conn
->max_recv_dlength
) {
553 printk(KERN_ERR
"iscsi_tcp: datalen %d > %d\n",
554 conn
->in
.datalen
, conn
->max_recv_dlength
);
555 return ISCSI_ERR_DATALEN
;
557 conn
->data_copied
= 0;
560 conn
->in
.ahslen
= hdr
->hlength
*(4*sizeof(__u16
));
561 conn
->in
.offset
+= conn
->in
.ahslen
;
562 conn
->in
.copy
-= conn
->in
.ahslen
;
563 if (conn
->in
.copy
< 0) {
564 printk(KERN_ERR
"iscsi_tcp: can't handle AHS with length "
565 "%d bytes\n", conn
->in
.ahslen
);
566 return ISCSI_ERR_AHSLEN
;
569 /* calculate read padding */
570 conn
->in
.padding
= conn
->in
.datalen
& (ISCSI_PAD_LEN
-1);
571 if (conn
->in
.padding
) {
572 conn
->in
.padding
= ISCSI_PAD_LEN
- conn
->in
.padding
;
573 debug_scsi("read padding %d bytes\n", conn
->in
.padding
);
576 if (conn
->hdrdgst_en
) {
577 struct scatterlist sg
;
579 sg_init_one(&sg
, (u8
*)hdr
,
580 sizeof(struct iscsi_hdr
) + conn
->in
.ahslen
);
581 crypto_digest_digest(conn
->rx_tfm
, &sg
, 1, (u8
*)&cdgst
);
582 rdgst
= *(uint32_t*)((char*)hdr
+ sizeof(struct iscsi_hdr
) +
586 /* save opcode for later */
587 conn
->in
.opcode
= hdr
->opcode
;
589 /* verify itt (itt encoding: age+cid+itt) */
590 if (hdr
->itt
!= cpu_to_be32(ISCSI_RESERVED_TAG
)) {
591 if ((hdr
->itt
& AGE_MASK
) !=
592 (session
->age
<< AGE_SHIFT
)) {
593 printk(KERN_ERR
"iscsi_tcp: received itt %x expected "
594 "session age (%x)\n", hdr
->itt
,
595 session
->age
& AGE_MASK
);
596 return ISCSI_ERR_BAD_ITT
;
599 if ((hdr
->itt
& CID_MASK
) != (conn
->id
<< CID_SHIFT
)) {
600 printk(KERN_ERR
"iscsi_tcp: received itt %x, expected "
601 "CID (%x)\n", hdr
->itt
, conn
->id
);
602 return ISCSI_ERR_BAD_ITT
;
604 conn
->in
.itt
= hdr
->itt
& ITT_MASK
;
606 conn
->in
.itt
= hdr
->itt
;
608 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
609 hdr
->opcode
, conn
->in
.offset
, conn
->in
.copy
,
610 conn
->in
.ahslen
, conn
->in
.datalen
);
612 if (conn
->in
.itt
< session
->cmds_max
) {
613 if (conn
->hdrdgst_en
&& cdgst
!= rdgst
) {
614 printk(KERN_ERR
"iscsi_tcp: itt %x: hdrdgst error "
615 "recv 0x%x calc 0x%x\n", conn
->in
.itt
, rdgst
,
617 return ISCSI_ERR_HDR_DGST
;
620 ctask
= (struct iscsi_cmd_task
*)session
->cmds
[conn
->in
.itt
];
623 printk(KERN_INFO
"iscsi_tcp: dropping ctask with "
624 "itt 0x%x\n", ctask
->itt
);
625 conn
->in
.datalen
= 0; /* force drop */
629 if (ctask
->sc
->SCp
.phase
!= session
->age
) {
630 printk(KERN_ERR
"iscsi_tcp: ctask's session age %d, "
631 "expected %d\n", ctask
->sc
->SCp
.phase
,
633 return ISCSI_ERR_SESSION_FAILED
;
636 conn
->in
.ctask
= ctask
;
638 debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n",
639 hdr
->opcode
, conn
->id
, (long)ctask
->sc
,
640 ctask
->itt
, conn
->in
.datalen
);
642 switch(conn
->in
.opcode
) {
643 case ISCSI_OP_SCSI_CMD_RSP
:
644 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
645 if (ctask
->hdr
.flags
& ISCSI_FLAG_CMD_WRITE
)
646 rc
= iscsi_cmd_rsp(conn
, ctask
);
647 else if (!conn
->in
.datalen
)
648 rc
= iscsi_cmd_rsp(conn
, ctask
);
651 * got sense or response data; copying PDU
652 * Header to the connection's header
655 memcpy(&conn
->hdr
, hdr
,
656 sizeof(struct iscsi_hdr
));
658 case ISCSI_OP_SCSI_DATA_IN
:
659 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
660 /* save flags for non-exceptional status */
661 conn
->in
.flags
= hdr
->flags
;
662 /* save cmd_status for sense data */
663 conn
->in
.cmd_status
=
664 ((struct iscsi_data_rsp
*)hdr
)->cmd_status
;
665 rc
= iscsi_data_rsp(conn
, ctask
);
668 BUG_ON((void*)ctask
!= ctask
->sc
->SCp
.ptr
);
669 if (ctask
->hdr
.flags
& ISCSI_FLAG_CMD_WRITE
&&
670 ctask
->sc
->sc_data_direction
== DMA_TO_DEVICE
)
671 rc
= iscsi_r2t_rsp(conn
, ctask
);
673 rc
= ISCSI_ERR_PROTO
;
675 case ISCSI_OP_NOOP_IN
:
676 case ISCSI_OP_TEXT_RSP
:
677 case ISCSI_OP_LOGOUT_RSP
:
678 case ISCSI_OP_ASYNC_EVENT
:
679 case ISCSI_OP_REJECT
:
680 rc
= iscsi_check_assign_cmdsn(session
,
681 (struct iscsi_nopin
*)hdr
);
685 /* update ExpStatSN */
686 conn
->exp_statsn
= be32_to_cpu(hdr
->statsn
) + 1;
687 if (!conn
->in
.datalen
) {
688 struct iscsi_mgmt_task
*mtask
;
690 rc
= iscsi_recv_pdu(iscsi_handle(conn
), hdr
,
692 mtask
= (struct iscsi_mgmt_task
*)
693 session
->mgmt_cmds
[conn
->in
.itt
-
694 ISCSI_MGMT_ITT_OFFSET
];
695 if (conn
->login_mtask
!= mtask
) {
696 spin_lock(&session
->lock
);
697 __kfifo_put(session
->mgmtpool
.queue
,
698 (void*)&mtask
, sizeof(void*));
699 spin_unlock(&session
->lock
);
704 rc
= ISCSI_ERR_BAD_OPCODE
;
707 } else if (conn
->in
.itt
>= ISCSI_MGMT_ITT_OFFSET
&&
708 conn
->in
.itt
< ISCSI_MGMT_ITT_OFFSET
+
709 session
->mgmtpool_max
) {
710 struct iscsi_mgmt_task
*mtask
= (struct iscsi_mgmt_task
*)
711 session
->mgmt_cmds
[conn
->in
.itt
-
712 ISCSI_MGMT_ITT_OFFSET
];
714 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
715 conn
->in
.opcode
, conn
->id
, mtask
->itt
,
718 switch(conn
->in
.opcode
) {
719 case ISCSI_OP_LOGIN_RSP
:
720 case ISCSI_OP_TEXT_RSP
:
721 rc
= iscsi_check_assign_cmdsn(session
,
722 (struct iscsi_nopin
*)hdr
);
726 if (!conn
->in
.datalen
) {
727 rc
= iscsi_recv_pdu(iscsi_handle(conn
), hdr
,
729 if (conn
->login_mtask
!= mtask
) {
730 spin_lock(&session
->lock
);
731 __kfifo_put(session
->mgmtpool
.queue
,
732 (void*)&mtask
, sizeof(void*));
733 spin_unlock(&session
->lock
);
737 case ISCSI_OP_SCSI_TMFUNC_RSP
:
738 rc
= iscsi_check_assign_cmdsn(session
,
739 (struct iscsi_nopin
*)hdr
);
743 if (conn
->in
.datalen
|| conn
->in
.ahslen
) {
744 rc
= ISCSI_ERR_PROTO
;
747 conn
->tmfrsp_pdus_cnt
++;
748 spin_lock(&session
->lock
);
749 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
750 __kfifo_put(session
->mgmtpool
.queue
,
751 (void*)&mtask
, sizeof(void*));
752 conn
->tmabort_state
=
753 ((struct iscsi_tm_rsp
*)hdr
)->
754 response
== ISCSI_TMF_RSP_COMPLETE
?
755 TMABORT_SUCCESS
:TMABORT_FAILED
;
756 /* unblock eh_abort() */
757 wake_up(&conn
->ehwait
);
759 spin_unlock(&session
->lock
);
762 rc
= ISCSI_ERR_BAD_OPCODE
;
765 } else if (conn
->in
.itt
== ISCSI_RESERVED_TAG
) {
766 if (conn
->in
.opcode
== ISCSI_OP_NOOP_IN
&& !conn
->in
.datalen
) {
767 rc
= iscsi_check_assign_cmdsn(session
,
768 (struct iscsi_nopin
*)hdr
);
770 rc
= iscsi_recv_pdu(iscsi_handle(conn
),
774 rc
= ISCSI_ERR_BAD_OPCODE
;
776 rc
= ISCSI_ERR_BAD_ITT
;
782 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
783 * @conn: iscsi connection
784 * @ctask: scsi command task
785 * @buf: buffer to copy to
786 * @buf_size: size of buffer
787 * @offset: offset within the buffer
790 * The function calls skb_copy_bits() and updates per-connection and
791 * per-cmd byte counters.
793 * Read counters (in bytes):
795 * conn->in.offset offset within in progress SKB
796 * conn->in.copy left to copy from in progress SKB
798 * conn->in.copied copied already from in progress SKB
799 * conn->data_copied copied already from in progress buffer
800 * ctask->sent total bytes sent up to the MidLayer
801 * ctask->data_count left to copy from in progress Data-In
802 * buf_left left to copy from in progress buffer
805 iscsi_ctask_copy(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
806 void *buf
, int buf_size
, int offset
)
808 int buf_left
= buf_size
- (conn
->data_copied
+ offset
);
809 int size
= min(conn
->in
.copy
, buf_left
);
812 size
= min(size
, ctask
->data_count
);
814 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
815 size
, conn
->in
.offset
, conn
->in
.copied
);
818 BUG_ON(ctask
->sent
+ size
> ctask
->total_length
);
820 rc
= skb_copy_bits(conn
->in
.skb
, conn
->in
.offset
,
821 (char*)buf
+ (offset
+ conn
->data_copied
), size
);
822 /* must fit into skb->len */
825 conn
->in
.offset
+= size
;
826 conn
->in
.copy
-= size
;
827 conn
->in
.copied
+= size
;
828 conn
->data_copied
+= size
;
830 ctask
->data_count
-= size
;
832 BUG_ON(conn
->in
.copy
< 0);
833 BUG_ON(ctask
->data_count
< 0);
835 if (buf_size
!= (conn
->data_copied
+ offset
)) {
836 if (!ctask
->data_count
) {
837 BUG_ON(buf_size
- conn
->data_copied
< 0);
838 /* done with this PDU */
839 return buf_size
- conn
->data_copied
;
844 /* done with this buffer or with both - PDU and buffer */
845 conn
->data_copied
= 0;
850 * iscsi_tcp_copy - copy skb bits to the destanation buffer
851 * @conn: iscsi connection
852 * @buf: buffer to copy to
853 * @buf_size: number of bytes to copy
856 * The function calls skb_copy_bits() and updates per-connection
860 iscsi_tcp_copy(struct iscsi_conn
*conn
, void *buf
, int buf_size
)
862 int buf_left
= buf_size
- conn
->data_copied
;
863 int size
= min(conn
->in
.copy
, buf_left
);
866 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
867 size
, conn
->in
.offset
, conn
->data_copied
);
870 rc
= skb_copy_bits(conn
->in
.skb
, conn
->in
.offset
,
871 (char*)buf
+ conn
->data_copied
, size
);
874 conn
->in
.offset
+= size
;
875 conn
->in
.copy
-= size
;
876 conn
->in
.copied
+= size
;
877 conn
->data_copied
+= size
;
879 if (buf_size
!= conn
->data_copied
)
886 partial_sg_digest_update(struct iscsi_conn
*conn
, struct scatterlist
*sg
,
887 int offset
, int length
)
889 struct scatterlist temp
;
891 memcpy(&temp
, sg
, sizeof(struct scatterlist
));
892 temp
.offset
= offset
;
893 temp
.length
= length
;
894 crypto_digest_update(conn
->data_rx_tfm
, &temp
, 1);
897 static int iscsi_scsi_data_in(struct iscsi_conn
*conn
)
899 struct iscsi_cmd_task
*ctask
= conn
->in
.ctask
;
900 struct scsi_cmnd
*sc
= ctask
->sc
;
901 struct scatterlist tmp
, *sg
;
902 int i
, offset
, rc
= 0;
904 BUG_ON((void*)ctask
!= sc
->SCp
.ptr
);
907 * copying Data-In into the Scsi_Cmnd
910 i
= ctask
->data_count
;
911 rc
= iscsi_ctask_copy(conn
, ctask
, sc
->request_buffer
,
912 sc
->request_bufflen
, ctask
->data_offset
);
915 if (conn
->datadgst_en
) {
916 sg_init_one(&tmp
, sc
->request_buffer
, i
);
917 crypto_digest_update(conn
->data_rx_tfm
, &tmp
, 1);
923 offset
= ctask
->data_offset
;
924 sg
= sc
->request_buffer
;
926 if (ctask
->data_offset
)
927 for (i
= 0; i
< ctask
->sg_count
; i
++)
928 offset
-= sg
[i
].length
;
929 /* we've passed through partial sg*/
933 for (i
= ctask
->sg_count
; i
< sc
->use_sg
; i
++) {
936 dest
= kmap_atomic(sg
[i
].page
, KM_SOFTIRQ0
);
937 rc
= iscsi_ctask_copy(conn
, ctask
, dest
+ sg
[i
].offset
,
938 sg
[i
].length
, offset
);
939 kunmap_atomic(dest
, KM_SOFTIRQ0
);
941 /* continue with the next SKB/PDU */
944 if (conn
->datadgst_en
) {
946 crypto_digest_update(conn
->data_rx_tfm
,
949 partial_sg_digest_update(conn
, &sg
[i
],
950 sg
[i
].offset
+ offset
,
951 sg
[i
].length
- offset
);
957 if (!ctask
->data_count
) {
958 if (rc
&& conn
->datadgst_en
)
960 * data-in is complete, but buffer not...
962 partial_sg_digest_update(conn
, &sg
[i
],
963 sg
[i
].offset
, sg
[i
].length
-rc
);
971 BUG_ON(ctask
->data_count
);
974 /* check for non-exceptional status */
975 if (conn
->in
.flags
& ISCSI_FLAG_DATA_STATUS
) {
976 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
977 (long)sc
, sc
->result
, ctask
->itt
);
978 conn
->scsirsp_pdus_cnt
++;
979 iscsi_ctask_cleanup(conn
, ctask
);
987 iscsi_data_recv(struct iscsi_conn
*conn
)
989 struct iscsi_session
*session
= conn
->session
;
992 switch(conn
->in
.opcode
) {
993 case ISCSI_OP_SCSI_DATA_IN
:
994 rc
= iscsi_scsi_data_in(conn
);
996 case ISCSI_OP_SCSI_CMD_RSP
: {
999 * copying the entire Data Segment.
1001 if (iscsi_tcp_copy(conn
, conn
->data
, conn
->in
.datalen
)) {
1009 conn
->in
.hdr
= &conn
->hdr
;
1010 conn
->senselen
= (conn
->data
[0] << 8) | conn
->data
[1];
1011 rc
= iscsi_cmd_rsp(conn
, conn
->in
.ctask
);
1014 case ISCSI_OP_TEXT_RSP
:
1015 case ISCSI_OP_LOGIN_RSP
:
1016 case ISCSI_OP_NOOP_IN
: {
1017 struct iscsi_mgmt_task
*mtask
= NULL
;
1019 if (conn
->in
.itt
!= ISCSI_RESERVED_TAG
)
1020 mtask
= (struct iscsi_mgmt_task
*)
1021 session
->mgmt_cmds
[conn
->in
.itt
-
1022 ISCSI_MGMT_ITT_OFFSET
];
1025 * Collect data segment to the connection's data
1028 if (iscsi_tcp_copy(conn
, conn
->data
, conn
->in
.datalen
)) {
1033 rc
= iscsi_recv_pdu(iscsi_handle(conn
), conn
->in
.hdr
,
1034 conn
->data
, conn
->in
.datalen
);
1036 if (mtask
&& conn
->login_mtask
!= mtask
) {
1037 spin_lock(&session
->lock
);
1038 __kfifo_put(session
->mgmtpool
.queue
, (void*)&mtask
,
1040 spin_unlock(&session
->lock
);
1052 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
1053 * @rd_desc: read descriptor
1054 * @skb: socket buffer
1055 * @offset: offset in skb
1056 * @len: skb->len - offset
1059 iscsi_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
,
1060 unsigned int offset
, size_t len
)
1063 struct iscsi_conn
*conn
= rd_desc
->arg
.data
;
1065 char pad
[ISCSI_PAD_LEN
];
1066 struct scatterlist sg
;
1069 * Save current SKB and its offset in the corresponding
1070 * connection context.
1072 conn
->in
.copy
= skb
->len
- offset
;
1073 conn
->in
.offset
= offset
;
1075 conn
->in
.len
= conn
->in
.copy
;
1076 BUG_ON(conn
->in
.copy
<= 0);
1077 debug_tcp("in %d bytes\n", conn
->in
.copy
);
1080 conn
->in
.copied
= 0;
1083 if (unlikely(conn
->suspend_rx
)) {
1084 debug_tcp("conn %d Rx suspended!\n", conn
->id
);
1088 if (conn
->in_progress
== IN_PROGRESS_WAIT_HEADER
||
1089 conn
->in_progress
== IN_PROGRESS_HEADER_GATHER
) {
1090 rc
= iscsi_hdr_extract(conn
);
1095 iscsi_conn_failure(conn
, rc
);
1101 * Verify and process incoming PDU header.
1103 rc
= iscsi_hdr_recv(conn
);
1104 if (!rc
&& conn
->in
.datalen
) {
1105 if (conn
->datadgst_en
&&
1106 conn
->in
.opcode
== ISCSI_OP_SCSI_DATA_IN
) {
1107 BUG_ON(!conn
->data_rx_tfm
);
1108 crypto_digest_init(conn
->data_rx_tfm
);
1110 conn
->in_progress
= IN_PROGRESS_DATA_RECV
;
1112 iscsi_conn_failure(conn
, rc
);
1117 if (conn
->in_progress
== IN_PROGRESS_DDIGEST_RECV
) {
1118 debug_tcp("extra data_recv offset %d copy %d\n",
1119 conn
->in
.offset
, conn
->in
.copy
);
1120 if (conn
->in
.opcode
== ISCSI_OP_SCSI_DATA_IN
) {
1121 uint32_t recv_digest
;
1122 skb_copy_bits(conn
->in
.skb
, conn
->in
.offset
,
1124 conn
->in
.offset
+= 4;
1126 if (recv_digest
!= conn
->in
.datadgst
) {
1127 debug_tcp("iscsi_tcp: data digest error!"
1128 "0x%x != 0x%x\n", recv_digest
,
1130 iscsi_conn_failure(conn
, ISCSI_ERR_DATA_DGST
);
1133 debug_tcp("iscsi_tcp: data digest match!"
1134 "0x%x == 0x%x\n", recv_digest
,
1136 conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
1141 if (conn
->in_progress
== IN_PROGRESS_DATA_RECV
&& conn
->in
.copy
) {
1143 debug_tcp("data_recv offset %d copy %d\n",
1144 conn
->in
.offset
, conn
->in
.copy
);
1146 rc
= iscsi_data_recv(conn
);
1148 if (rc
== -EAGAIN
) {
1149 rd_desc
->count
= conn
->in
.datalen
-
1150 conn
->in
.ctask
->data_count
;
1153 iscsi_conn_failure(conn
, rc
);
1156 conn
->in
.copy
-= conn
->in
.padding
;
1157 conn
->in
.offset
+= conn
->in
.padding
;
1158 if (conn
->datadgst_en
&&
1159 conn
->in
.opcode
== ISCSI_OP_SCSI_DATA_IN
) {
1160 if (conn
->in
.padding
) {
1161 debug_tcp("padding -> %d\n", conn
->in
.padding
);
1162 memset(pad
, 0, conn
->in
.padding
);
1163 sg_init_one(&sg
, pad
, conn
->in
.padding
);
1164 crypto_digest_update(conn
->data_rx_tfm
, &sg
, 1);
1166 crypto_digest_final(conn
->data_rx_tfm
,
1167 (u8
*) & conn
->in
.datadgst
);
1168 debug_tcp("rx digest 0x%x\n", conn
->in
.datadgst
);
1169 conn
->in_progress
= IN_PROGRESS_DDIGEST_RECV
;
1171 conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
1174 debug_tcp("f, processed %d from out of %d padding %d\n",
1175 conn
->in
.offset
- offset
, (int)len
, conn
->in
.padding
);
1176 BUG_ON(conn
->in
.offset
- offset
> len
);
1178 if (conn
->in
.offset
- offset
!= len
) {
1179 debug_tcp("continue to process %d bytes\n",
1180 (int)len
- (conn
->in
.offset
- offset
));
1185 processed
= conn
->in
.offset
- offset
;
1186 BUG_ON(processed
== 0);
1190 processed
= conn
->in
.offset
- offset
;
1191 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
1192 processed
, (int)len
, (int)rd_desc
->count
);
1193 BUG_ON(processed
== 0);
1194 BUG_ON(processed
> len
);
1196 conn
->rxdata_octets
+= processed
;
1201 iscsi_tcp_data_ready(struct sock
*sk
, int flag
)
1203 struct iscsi_conn
*conn
= sk
->sk_user_data
;
1204 read_descriptor_t rd_desc
;
1206 read_lock(&sk
->sk_callback_lock
);
1208 /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
1209 rd_desc
.arg
.data
= conn
;
1211 tcp_read_sock(sk
, &rd_desc
, iscsi_tcp_data_recv
);
1213 read_unlock(&sk
->sk_callback_lock
);
1217 iscsi_tcp_state_change(struct sock
*sk
)
1219 struct iscsi_conn
*conn
;
1220 struct iscsi_session
*session
;
1221 void (*old_state_change
)(struct sock
*);
1223 read_lock(&sk
->sk_callback_lock
);
1225 conn
= (struct iscsi_conn
*)sk
->sk_user_data
;
1226 session
= conn
->session
;
1228 if (sk
->sk_state
== TCP_CLOSE_WAIT
||
1229 sk
->sk_state
== TCP_CLOSE
) {
1230 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1231 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1234 old_state_change
= conn
->old_state_change
;
1236 read_unlock(&sk
->sk_callback_lock
);
1238 old_state_change(sk
);
1242 * iscsi_write_space - Called when more output buffer space is available
1243 * @sk: socket space is available for
1246 iscsi_write_space(struct sock
*sk
)
1248 struct iscsi_conn
*conn
= (struct iscsi_conn
*)sk
->sk_user_data
;
1249 conn
->old_write_space(sk
);
1250 debug_tcp("iscsi_write_space: cid %d\n", conn
->id
);
1251 clear_bit(SUSPEND_BIT
, &conn
->suspend_tx
);
1252 schedule_work(&conn
->xmitwork
);
1256 iscsi_conn_set_callbacks(struct iscsi_conn
*conn
)
1258 struct sock
*sk
= conn
->sock
->sk
;
1260 /* assign new callbacks */
1261 write_lock_bh(&sk
->sk_callback_lock
);
1262 sk
->sk_user_data
= conn
;
1263 conn
->old_data_ready
= sk
->sk_data_ready
;
1264 conn
->old_state_change
= sk
->sk_state_change
;
1265 conn
->old_write_space
= sk
->sk_write_space
;
1266 sk
->sk_data_ready
= iscsi_tcp_data_ready
;
1267 sk
->sk_state_change
= iscsi_tcp_state_change
;
1268 sk
->sk_write_space
= iscsi_write_space
;
1269 write_unlock_bh(&sk
->sk_callback_lock
);
1273 iscsi_conn_restore_callbacks(struct iscsi_conn
*conn
)
1275 struct sock
*sk
= conn
->sock
->sk
;
1277 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1278 write_lock_bh(&sk
->sk_callback_lock
);
1279 sk
->sk_user_data
= NULL
;
1280 sk
->sk_data_ready
= conn
->old_data_ready
;
1281 sk
->sk_state_change
= conn
->old_state_change
;
1282 sk
->sk_write_space
= conn
->old_write_space
;
1283 sk
->sk_no_check
= 0;
1284 write_unlock_bh(&sk
->sk_callback_lock
);
1288 * iscsi_send - generic send routine
1289 * @sk: kernel's socket
1290 * @buf: buffer to write from
1291 * @size: actual size to write
1292 * @flags: socket's flags
1295 * depending on buffer will use tcp_sendpage() or tcp_sendmsg().
1296 * buf->sg.offset == -1 tells us that buffer is non S/G and forces
1297 * to use tcp_sendmsg().
1300 iscsi_send(struct socket
*sk
, struct iscsi_buf
*buf
, int size
, int flags
)
1304 if ((int)buf
->sg
.offset
>= 0) {
1305 int offset
= buf
->sg
.offset
+ buf
->sent
;
1308 res
= sk
->ops
->sendpage(sk
, buf
->sg
.page
, offset
, size
, flags
);
1312 buf
->iov
.iov_base
= iscsi_buf_iov_base(buf
);
1313 buf
->iov
.iov_len
= size
;
1315 memset(&msg
, 0, sizeof(struct msghdr
));
1318 res
= kernel_sendmsg(sk
, &msg
, &buf
->iov
, 1, size
);
1325 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1326 * @conn: iscsi connection
1327 * @buf: buffer to write from
1328 * @datalen: lenght of data to be sent after the header
1334 iscsi_sendhdr(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
, int datalen
)
1336 struct socket
*sk
= conn
->sock
;
1337 int flags
= 0; /* MSG_DONTWAIT; */
1340 size
= buf
->sg
.length
- buf
->sent
;
1341 BUG_ON(buf
->sent
+ size
> buf
->sg
.length
);
1342 if (buf
->sent
+ size
!= buf
->sg
.length
|| datalen
)
1345 res
= iscsi_send(sk
, buf
, size
, flags
);
1346 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size
, buf
->sent
, res
);
1348 conn
->txdata_octets
+= res
;
1353 } else if (res
== -EAGAIN
) {
1354 conn
->sendpage_failures_cnt
++;
1355 set_bit(SUSPEND_BIT
, &conn
->suspend_tx
);
1356 } else if (res
== -EPIPE
)
1357 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1363 * iscsi_sendpage - send one page of iSCSI Data-Out.
1364 * @conn: iscsi connection
1365 * @buf: buffer to write from
1366 * @count: remaining data
1367 * @sent: number of bytes sent
1373 iscsi_sendpage(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
,
1374 int *count
, int *sent
)
1376 struct socket
*sk
= conn
->sock
;
1377 int flags
= 0; /* MSG_DONTWAIT; */
1380 size
= buf
->sg
.length
- buf
->sent
;
1381 BUG_ON(buf
->sent
+ size
> buf
->sg
.length
);
1384 if (buf
->sent
+ size
!= buf
->sg
.length
|| *count
!= size
)
1387 res
= iscsi_send(sk
, buf
, size
, flags
);
1388 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1389 size
, buf
->sent
, *count
, *sent
, res
);
1391 conn
->txdata_octets
+= res
;
1398 } else if (res
== -EAGAIN
) {
1399 conn
->sendpage_failures_cnt
++;
1400 set_bit(SUSPEND_BIT
, &conn
->suspend_tx
);
1401 } else if (res
== -EPIPE
)
1402 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1408 iscsi_data_digest_init(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1410 BUG_ON(!conn
->data_tx_tfm
);
1411 crypto_digest_init(conn
->data_tx_tfm
);
1412 ctask
->digest_count
= 4;
1416 iscsi_buf_data_digest_update(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
)
1418 struct scatterlist sg
;
1420 if (buf
->sg
.offset
!= -1)
1421 crypto_digest_update(conn
->data_tx_tfm
, &buf
->sg
, 1);
1423 sg_init_one(&sg
, (char *)buf
->sg
.page
, buf
->sg
.length
);
1424 crypto_digest_update(conn
->data_tx_tfm
, &sg
, 1);
1429 iscsi_digest_final_send(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1430 struct iscsi_buf
*buf
, uint32_t *digest
, int final
)
1436 crypto_digest_final(conn
->data_tx_tfm
, (u8
*)digest
);
1438 iscsi_buf_init_virt(buf
, (char*)digest
, 4);
1439 rc
= iscsi_sendpage(conn
, buf
, &ctask
->digest_count
, &sent
);
1441 ctask
->datadigest
= *digest
;
1442 ctask
->xmstate
|= XMSTATE_DATA_DIGEST
;
1444 ctask
->digest_count
= 4;
1449 * iscsi_solicit_data_cont - initialize next Data-Out
1450 * @conn: iscsi connection
1451 * @ctask: scsi command task
1453 * @left: bytes left to transfer
1456 * Initialize next Data-Out within this R2T sequence and continue
1457 * to process next Scatter-Gather element(if any) of this SCSI command.
1459 * Called under connection lock.
1462 iscsi_solicit_data_cont(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1463 struct iscsi_r2t_info
*r2t
, int left
)
1465 struct iscsi_data
*hdr
;
1466 struct iscsi_data_task
*dtask
;
1467 struct scsi_cmnd
*sc
= ctask
->sc
;
1470 dtask
= mempool_alloc(ctask
->datapool
, GFP_ATOMIC
);
1473 memset(hdr
, 0, sizeof(struct iscsi_data
));
1474 hdr
->ttt
= r2t
->ttt
;
1475 hdr
->datasn
= cpu_to_be32(r2t
->solicit_datasn
);
1476 r2t
->solicit_datasn
++;
1477 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
1478 memcpy(hdr
->lun
, ctask
->hdr
.lun
, sizeof(hdr
->lun
));
1479 hdr
->itt
= ctask
->hdr
.itt
;
1480 hdr
->exp_statsn
= r2t
->exp_statsn
;
1481 new_offset
= r2t
->data_offset
+ r2t
->sent
;
1482 hdr
->offset
= cpu_to_be32(new_offset
);
1483 if (left
> conn
->max_xmit_dlength
) {
1484 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
1485 r2t
->data_count
= conn
->max_xmit_dlength
;
1487 hton24(hdr
->dlength
, left
);
1488 r2t
->data_count
= left
;
1489 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
1491 conn
->dataout_pdus_cnt
++;
1493 iscsi_buf_init_virt(&r2t
->headbuf
, (char*)hdr
,
1494 sizeof(struct iscsi_hdr
));
1498 if (sc
->use_sg
&& !iscsi_buf_left(&r2t
->sendbuf
)) {
1499 BUG_ON(ctask
->bad_sg
== r2t
->sg
);
1500 iscsi_buf_init_sg(&r2t
->sendbuf
, r2t
->sg
);
1503 iscsi_buf_init_iov(&ctask
->sendbuf
,
1504 (char*)sc
->request_buffer
+ new_offset
,
1507 list_add(&dtask
->item
, &ctask
->dataqueue
);
1511 iscsi_unsolicit_data_init(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1513 struct iscsi_data
*hdr
;
1514 struct iscsi_data_task
*dtask
;
1516 dtask
= mempool_alloc(ctask
->datapool
, GFP_ATOMIC
);
1519 memset(hdr
, 0, sizeof(struct iscsi_data
));
1520 hdr
->ttt
= cpu_to_be32(ISCSI_RESERVED_TAG
);
1521 hdr
->datasn
= cpu_to_be32(ctask
->unsol_datasn
);
1522 ctask
->unsol_datasn
++;
1523 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
1524 memcpy(hdr
->lun
, ctask
->hdr
.lun
, sizeof(hdr
->lun
));
1525 hdr
->itt
= ctask
->hdr
.itt
;
1526 hdr
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
1527 hdr
->offset
= cpu_to_be32(ctask
->total_length
-
1528 ctask
->r2t_data_count
-
1529 ctask
->unsol_count
);
1530 if (ctask
->unsol_count
> conn
->max_xmit_dlength
) {
1531 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
1532 ctask
->data_count
= conn
->max_xmit_dlength
;
1535 hton24(hdr
->dlength
, ctask
->unsol_count
);
1536 ctask
->data_count
= ctask
->unsol_count
;
1537 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
1540 iscsi_buf_init_virt(&ctask
->headbuf
, (char*)hdr
,
1541 sizeof(struct iscsi_hdr
));
1543 list_add(&dtask
->item
, &ctask
->dataqueue
);
1545 ctask
->dtask
= dtask
;
1549 * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1550 * @conn: iscsi connection
1551 * @ctask: scsi command task
1555 iscsi_cmd_init(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1556 struct scsi_cmnd
*sc
)
1558 struct iscsi_session
*session
= conn
->session
;
1560 BUG_ON(__kfifo_len(ctask
->r2tqueue
));
1564 ctask
->hdr
.opcode
= ISCSI_OP_SCSI_CMD
;
1565 ctask
->hdr
.flags
= ISCSI_ATTR_SIMPLE
;
1566 int_to_scsilun(sc
->device
->lun
, (struct scsi_lun
*)ctask
->hdr
.lun
);
1567 ctask
->hdr
.itt
= ctask
->itt
| (conn
->id
<< CID_SHIFT
) |
1568 (session
->age
<< AGE_SHIFT
);
1569 ctask
->hdr
.data_length
= cpu_to_be32(sc
->request_bufflen
);
1570 ctask
->hdr
.cmdsn
= cpu_to_be32(session
->cmdsn
); session
->cmdsn
++;
1571 ctask
->hdr
.exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
1572 memcpy(ctask
->hdr
.cdb
, sc
->cmnd
, sc
->cmd_len
);
1573 memset(&ctask
->hdr
.cdb
[sc
->cmd_len
], 0, MAX_COMMAND_SIZE
- sc
->cmd_len
);
1575 ctask
->mtask
= NULL
;
1577 ctask
->sg_count
= 0;
1579 ctask
->total_length
= sc
->request_bufflen
;
1581 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
1582 ctask
->exp_r2tsn
= 0;
1583 ctask
->hdr
.flags
|= ISCSI_FLAG_CMD_WRITE
;
1584 BUG_ON(ctask
->total_length
== 0);
1586 struct scatterlist
*sg
= sc
->request_buffer
;
1588 iscsi_buf_init_sg(&ctask
->sendbuf
,
1589 &sg
[ctask
->sg_count
++]);
1591 ctask
->bad_sg
= sg
+ sc
->use_sg
;
1593 iscsi_buf_init_iov(&ctask
->sendbuf
, sc
->request_buffer
,
1594 sc
->request_bufflen
);
1600 * imm_count bytes to be sent right after
1603 * unsol_count bytes(as Data-Out) to be sent
1604 * without R2T ack right after
1607 * r2t_data_count bytes to be sent via R2T ack's
1609 * pad_count bytes to be sent as zero-padding
1611 ctask
->imm_count
= 0;
1612 ctask
->unsol_count
= 0;
1613 ctask
->unsol_datasn
= 0;
1614 ctask
->xmstate
= XMSTATE_W_HDR
;
1615 /* calculate write padding */
1616 ctask
->pad_count
= ctask
->total_length
& (ISCSI_PAD_LEN
-1);
1617 if (ctask
->pad_count
) {
1618 ctask
->pad_count
= ISCSI_PAD_LEN
- ctask
->pad_count
;
1619 debug_scsi("write padding %d bytes\n",
1621 ctask
->xmstate
|= XMSTATE_W_PAD
;
1623 if (session
->imm_data_en
) {
1624 if (ctask
->total_length
>= session
->first_burst
)
1625 ctask
->imm_count
= min(session
->first_burst
,
1626 conn
->max_xmit_dlength
);
1628 ctask
->imm_count
= min(ctask
->total_length
,
1629 conn
->max_xmit_dlength
);
1630 hton24(ctask
->hdr
.dlength
, ctask
->imm_count
);
1631 ctask
->xmstate
|= XMSTATE_IMM_DATA
;
1633 zero_data(ctask
->hdr
.dlength
);
1635 if (!session
->initial_r2t_en
)
1636 ctask
->unsol_count
= min(session
->first_burst
,
1637 ctask
->total_length
) - ctask
->imm_count
;
1638 if (!ctask
->unsol_count
)
1639 /* No unsolicit Data-Out's */
1640 ctask
->hdr
.flags
|= ISCSI_FLAG_CMD_FINAL
;
1642 ctask
->xmstate
|= XMSTATE_UNS_HDR
| XMSTATE_UNS_INIT
;
1644 ctask
->r2t_data_count
= ctask
->total_length
-
1648 debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
1650 ctask
->itt
, ctask
->total_length
, ctask
->imm_count
,
1651 ctask
->unsol_count
, ctask
->r2t_data_count
);
1653 ctask
->hdr
.flags
|= ISCSI_FLAG_CMD_FINAL
;
1654 if (sc
->sc_data_direction
== DMA_FROM_DEVICE
)
1655 ctask
->hdr
.flags
|= ISCSI_FLAG_CMD_READ
;
1657 ctask
->xmstate
= XMSTATE_R_HDR
;
1658 zero_data(ctask
->hdr
.dlength
);
1661 iscsi_buf_init_virt(&ctask
->headbuf
, (char*)&ctask
->hdr
,
1662 sizeof(struct iscsi_hdr
));
1663 conn
->scsicmd_pdus_cnt
++;
1667 * iscsi_mtask_xmit - xmit management(immediate) task
1668 * @conn: iscsi connection
1669 * @mtask: task management task
1672 * The function can return -EAGAIN in which case caller must
1673 * call it again later, or recover. '0' return code means successful
1676 * Management xmit state machine consists of two states:
1677 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1678 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1681 iscsi_mtask_xmit(struct iscsi_conn
*conn
, struct iscsi_mgmt_task
*mtask
)
1684 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1685 conn
->id
, mtask
->xmstate
, mtask
->itt
);
1687 if (mtask
->xmstate
& XMSTATE_IMM_HDR
) {
1688 mtask
->xmstate
&= ~XMSTATE_IMM_HDR
;
1689 if (mtask
->data_count
)
1690 mtask
->xmstate
|= XMSTATE_IMM_DATA
;
1691 if (conn
->c_stage
!= ISCSI_CONN_INITIAL_STAGE
&&
1692 conn
->stop_stage
!= STOP_CONN_RECOVER
&&
1694 iscsi_hdr_digest(conn
, &mtask
->headbuf
,
1695 (u8
*)mtask
->hdrext
);
1696 if (iscsi_sendhdr(conn
, &mtask
->headbuf
, mtask
->data_count
)) {
1697 mtask
->xmstate
|= XMSTATE_IMM_HDR
;
1698 if (mtask
->data_count
)
1699 mtask
->xmstate
&= ~XMSTATE_IMM_DATA
;
1704 if (mtask
->xmstate
& XMSTATE_IMM_DATA
) {
1705 BUG_ON(!mtask
->data_count
);
1706 mtask
->xmstate
&= ~XMSTATE_IMM_DATA
;
1707 /* FIXME: implement.
1708 * Virtual buffer could be spreaded across multiple pages...
1711 if (iscsi_sendpage(conn
, &mtask
->sendbuf
,
1712 &mtask
->data_count
, &mtask
->sent
)) {
1713 mtask
->xmstate
|= XMSTATE_IMM_DATA
;
1716 } while (mtask
->data_count
);
1719 BUG_ON(mtask
->xmstate
!= XMSTATE_IDLE
);
1724 handle_xmstate_r_hdr(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1726 ctask
->xmstate
&= ~XMSTATE_R_HDR
;
1727 if (conn
->hdrdgst_en
)
1728 iscsi_hdr_digest(conn
, &ctask
->headbuf
, (u8
*)ctask
->hdrext
);
1729 if (!iscsi_sendhdr(conn
, &ctask
->headbuf
, 0)) {
1730 BUG_ON(ctask
->xmstate
!= XMSTATE_IDLE
);
1731 return 0; /* wait for Data-In */
1733 ctask
->xmstate
|= XMSTATE_R_HDR
;
1738 handle_xmstate_w_hdr(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1740 ctask
->xmstate
&= ~XMSTATE_W_HDR
;
1741 if (conn
->hdrdgst_en
)
1742 iscsi_hdr_digest(conn
, &ctask
->headbuf
, (u8
*)ctask
->hdrext
);
1743 if (iscsi_sendhdr(conn
, &ctask
->headbuf
, ctask
->imm_count
)) {
1744 ctask
->xmstate
|= XMSTATE_W_HDR
;
1751 handle_xmstate_data_digest(struct iscsi_conn
*conn
,
1752 struct iscsi_cmd_task
*ctask
)
1754 ctask
->xmstate
&= ~XMSTATE_DATA_DIGEST
;
1755 debug_tcp("resent data digest 0x%x\n", ctask
->datadigest
);
1756 if (iscsi_digest_final_send(conn
, ctask
, &ctask
->immbuf
,
1757 &ctask
->datadigest
, 0)) {
1758 ctask
->xmstate
|= XMSTATE_DATA_DIGEST
;
1759 debug_tcp("resent data digest 0x%x fail!\n",
1767 handle_xmstate_imm_data(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1769 BUG_ON(!ctask
->imm_count
);
1770 ctask
->xmstate
&= ~XMSTATE_IMM_DATA
;
1772 if (conn
->datadgst_en
) {
1773 iscsi_data_digest_init(conn
, ctask
);
1774 ctask
->immdigest
= 0;
1778 if (iscsi_sendpage(conn
, &ctask
->sendbuf
, &ctask
->imm_count
,
1780 ctask
->xmstate
|= XMSTATE_IMM_DATA
;
1781 if (conn
->datadgst_en
) {
1782 crypto_digest_final(conn
->data_tx_tfm
,
1783 (u8
*)&ctask
->immdigest
);
1784 debug_tcp("tx imm sendpage fail 0x%x\n",
1789 if (conn
->datadgst_en
)
1790 iscsi_buf_data_digest_update(conn
, &ctask
->sendbuf
);
1792 if (!ctask
->imm_count
)
1794 iscsi_buf_init_sg(&ctask
->sendbuf
,
1795 &ctask
->sg
[ctask
->sg_count
++]);
1798 if (conn
->datadgst_en
&& !(ctask
->xmstate
& XMSTATE_W_PAD
)) {
1799 if (iscsi_digest_final_send(conn
, ctask
, &ctask
->immbuf
,
1800 &ctask
->immdigest
, 1)) {
1801 debug_tcp("sending imm digest 0x%x fail!\n",
1805 debug_tcp("sending imm digest 0x%x\n", ctask
->immdigest
);
1812 handle_xmstate_uns_hdr(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1814 struct iscsi_data_task
*dtask
;
1816 ctask
->xmstate
|= XMSTATE_UNS_DATA
;
1817 if (ctask
->xmstate
& XMSTATE_UNS_INIT
) {
1818 iscsi_unsolicit_data_init(conn
, ctask
);
1819 BUG_ON(!ctask
->dtask
);
1820 dtask
= ctask
->dtask
;
1821 if (conn
->hdrdgst_en
)
1822 iscsi_hdr_digest(conn
, &ctask
->headbuf
,
1823 (u8
*)dtask
->hdrext
);
1824 ctask
->xmstate
&= ~XMSTATE_UNS_INIT
;
1826 if (iscsi_sendhdr(conn
, &ctask
->headbuf
, ctask
->data_count
)) {
1827 ctask
->xmstate
&= ~XMSTATE_UNS_DATA
;
1828 ctask
->xmstate
|= XMSTATE_UNS_HDR
;
1832 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1833 ctask
->itt
, ctask
->unsol_count
, ctask
->sent
);
1838 handle_xmstate_uns_data(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1840 struct iscsi_data_task
*dtask
= ctask
->dtask
;
1842 BUG_ON(!ctask
->data_count
);
1843 ctask
->xmstate
&= ~XMSTATE_UNS_DATA
;
1845 if (conn
->datadgst_en
) {
1846 iscsi_data_digest_init(conn
, ctask
);
1851 int start
= ctask
->sent
;
1853 if (iscsi_sendpage(conn
, &ctask
->sendbuf
, &ctask
->data_count
,
1855 ctask
->unsol_count
-= ctask
->sent
- start
;
1856 ctask
->xmstate
|= XMSTATE_UNS_DATA
;
1857 /* will continue with this ctask later.. */
1858 if (conn
->datadgst_en
) {
1859 crypto_digest_final(conn
->data_tx_tfm
,
1860 (u8
*)&dtask
->digest
);
1861 debug_tcp("tx uns data fail 0x%x\n",
1867 BUG_ON(ctask
->sent
> ctask
->total_length
);
1868 ctask
->unsol_count
-= ctask
->sent
- start
;
1871 * XXX:we may run here with un-initial sendbuf.
1874 if (conn
->datadgst_en
&& ctask
->sent
- start
> 0)
1875 iscsi_buf_data_digest_update(conn
, &ctask
->sendbuf
);
1877 if (!ctask
->data_count
)
1879 iscsi_buf_init_sg(&ctask
->sendbuf
,
1880 &ctask
->sg
[ctask
->sg_count
++]);
1882 BUG_ON(ctask
->unsol_count
< 0);
1885 * Done with the Data-Out. Next, check if we need
1886 * to send another unsolicited Data-Out.
1888 if (ctask
->unsol_count
) {
1889 if (conn
->datadgst_en
) {
1890 if (iscsi_digest_final_send(conn
, ctask
,
1892 &dtask
->digest
, 1)) {
1893 debug_tcp("send uns digest 0x%x fail\n",
1897 debug_tcp("sending uns digest 0x%x, more uns\n",
1900 ctask
->xmstate
|= XMSTATE_UNS_INIT
;
1904 if (conn
->datadgst_en
&& !(ctask
->xmstate
& XMSTATE_W_PAD
)) {
1905 if (iscsi_digest_final_send(conn
, ctask
,
1907 &dtask
->digest
, 1)) {
1908 debug_tcp("send last uns digest 0x%x fail\n",
1912 debug_tcp("sending uns digest 0x%x\n",dtask
->digest
);
1919 handle_xmstate_sol_data(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1921 struct iscsi_session
*session
= conn
->session
;
1922 struct iscsi_r2t_info
*r2t
= ctask
->r2t
;
1923 struct iscsi_data_task
*dtask
= r2t
->dtask
;
1926 ctask
->xmstate
&= ~XMSTATE_SOL_DATA
;
1927 ctask
->dtask
= dtask
;
1929 if (conn
->datadgst_en
) {
1930 iscsi_data_digest_init(conn
, ctask
);
1935 * send Data-Out whitnin this R2T sequence.
1937 if (!r2t
->data_count
)
1940 if (iscsi_sendpage(conn
, &r2t
->sendbuf
, &r2t
->data_count
, &r2t
->sent
)) {
1941 ctask
->xmstate
|= XMSTATE_SOL_DATA
;
1942 /* will continue with this ctask later.. */
1943 if (conn
->datadgst_en
) {
1944 crypto_digest_final(conn
->data_tx_tfm
,
1945 (u8
*)&dtask
->digest
);
1946 debug_tcp("r2t data send fail 0x%x\n", dtask
->digest
);
1951 BUG_ON(r2t
->data_count
< 0);
1952 if (conn
->datadgst_en
)
1953 iscsi_buf_data_digest_update(conn
, &r2t
->sendbuf
);
1955 if (r2t
->data_count
) {
1956 BUG_ON(ctask
->sc
->use_sg
== 0);
1957 if (!iscsi_buf_left(&r2t
->sendbuf
)) {
1958 BUG_ON(ctask
->bad_sg
== r2t
->sg
);
1959 iscsi_buf_init_sg(&r2t
->sendbuf
, r2t
->sg
);
1967 * Done with this Data-Out. Next, check if we have
1968 * to send another Data-Out for this R2T.
1970 BUG_ON(r2t
->data_length
- r2t
->sent
< 0);
1971 left
= r2t
->data_length
- r2t
->sent
;
1973 if (conn
->datadgst_en
) {
1974 if (iscsi_digest_final_send(conn
, ctask
,
1976 &dtask
->digest
, 1)) {
1977 debug_tcp("send r2t data digest 0x%x"
1978 "fail\n", dtask
->digest
);
1981 debug_tcp("r2t data send digest 0x%x\n",
1984 iscsi_solicit_data_cont(conn
, ctask
, r2t
, left
);
1985 ctask
->xmstate
|= XMSTATE_SOL_DATA
;
1986 ctask
->xmstate
&= ~XMSTATE_SOL_HDR
;
1991 * Done with this R2T. Check if there are more
1992 * outstanding R2Ts ready to be processed.
1994 BUG_ON(ctask
->r2t_data_count
- r2t
->data_length
< 0);
1995 if (conn
->datadgst_en
) {
1996 if (iscsi_digest_final_send(conn
, ctask
, &dtask
->digestbuf
,
1997 &dtask
->digest
, 1)) {
1998 debug_tcp("send last r2t data digest 0x%x"
1999 "fail\n", dtask
->digest
);
2002 debug_tcp("r2t done dout digest 0x%x\n", dtask
->digest
);
2005 ctask
->r2t_data_count
-= r2t
->data_length
;
2007 spin_lock_bh(&session
->lock
);
2008 __kfifo_put(ctask
->r2tpool
.queue
, (void*)&r2t
, sizeof(void*));
2009 spin_unlock_bh(&session
->lock
);
2010 if (__kfifo_get(ctask
->r2tqueue
, (void*)&r2t
, sizeof(void*))) {
2012 ctask
->xmstate
|= XMSTATE_SOL_DATA
;
2013 ctask
->xmstate
&= ~XMSTATE_SOL_HDR
;
2021 handle_xmstate_w_pad(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
2023 struct iscsi_data_task
*dtask
= ctask
->dtask
;
2026 ctask
->xmstate
&= ~XMSTATE_W_PAD
;
2027 iscsi_buf_init_virt(&ctask
->sendbuf
, (char*)&ctask
->pad
,
2029 if (iscsi_sendpage(conn
, &ctask
->sendbuf
, &ctask
->pad_count
, &sent
)) {
2030 ctask
->xmstate
|= XMSTATE_W_PAD
;
2034 if (conn
->datadgst_en
) {
2035 iscsi_buf_data_digest_update(conn
, &ctask
->sendbuf
);
2038 if (iscsi_digest_final_send(conn
, ctask
, &ctask
->immbuf
,
2039 &ctask
->immdigest
, 1)) {
2040 debug_tcp("send padding digest 0x%x"
2041 "fail!\n", ctask
->immdigest
);
2044 debug_tcp("done with padding, digest 0x%x\n",
2047 if (iscsi_digest_final_send(conn
, ctask
,
2049 &dtask
->digest
, 1)) {
2050 debug_tcp("send padding digest 0x%x"
2051 "fail\n", dtask
->digest
);
2054 debug_tcp("done with padding, digest 0x%x\n",
2063 iscsi_ctask_xmit(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
2067 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
2068 conn
->id
, ctask
->xmstate
, ctask
->itt
);
2071 * serialize with TMF AbortTask
2076 if (ctask
->xmstate
& XMSTATE_R_HDR
) {
2077 rc
= handle_xmstate_r_hdr(conn
, ctask
);
2081 if (ctask
->xmstate
& XMSTATE_W_HDR
) {
2082 rc
= handle_xmstate_w_hdr(conn
, ctask
);
2087 /* XXX: for data digest xmit recover */
2088 if (ctask
->xmstate
& XMSTATE_DATA_DIGEST
) {
2089 rc
= handle_xmstate_data_digest(conn
, ctask
);
2094 if (ctask
->xmstate
& XMSTATE_IMM_DATA
) {
2095 rc
= handle_xmstate_imm_data(conn
, ctask
);
2100 if (ctask
->xmstate
& XMSTATE_UNS_HDR
) {
2101 BUG_ON(!ctask
->unsol_count
);
2102 ctask
->xmstate
&= ~XMSTATE_UNS_HDR
;
2103 unsolicit_head_again
:
2104 rc
= handle_xmstate_uns_hdr(conn
, ctask
);
2109 if (ctask
->xmstate
& XMSTATE_UNS_DATA
) {
2110 rc
= handle_xmstate_uns_data(conn
, ctask
);
2112 goto unsolicit_head_again
;
2118 if (ctask
->xmstate
& XMSTATE_SOL_HDR
) {
2119 struct iscsi_r2t_info
*r2t
;
2121 ctask
->xmstate
&= ~XMSTATE_SOL_HDR
;
2122 ctask
->xmstate
|= XMSTATE_SOL_DATA
;
2124 __kfifo_get(ctask
->r2tqueue
, (void*)&ctask
->r2t
,
2128 if (conn
->hdrdgst_en
)
2129 iscsi_hdr_digest(conn
, &r2t
->headbuf
,
2130 (u8
*)r2t
->dtask
->hdrext
);
2131 if (iscsi_sendhdr(conn
, &r2t
->headbuf
, r2t
->data_count
)) {
2132 ctask
->xmstate
&= ~XMSTATE_SOL_DATA
;
2133 ctask
->xmstate
|= XMSTATE_SOL_HDR
;
2137 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
2138 r2t
->solicit_datasn
- 1, ctask
->itt
, r2t
->data_count
,
2142 if (ctask
->xmstate
& XMSTATE_SOL_DATA
) {
2143 rc
= handle_xmstate_sol_data(conn
, ctask
);
2145 goto solicit_head_again
;
2152 * Last thing to check is whether we need to send write
2153 * padding. Note that we check for xmstate equality, not just the bit.
2155 if (ctask
->xmstate
== XMSTATE_W_PAD
)
2156 rc
= handle_xmstate_w_pad(conn
, ctask
);
2162 * iscsi_data_xmit - xmit any command into the scheduled connection
2163 * @conn: iscsi connection
2166 * The function can return -EAGAIN in which case the caller must
2167 * re-schedule it again later or recover. '0' return code means
2171 iscsi_data_xmit(struct iscsi_conn
*conn
)
2173 if (unlikely(conn
->suspend_tx
)) {
2174 debug_tcp("conn %d Tx suspended!\n", conn
->id
);
2179 * Transmit in the following order:
2181 * 1) un-finished xmit (ctask or mtask)
2182 * 2) immediate control PDUs
2185 * 5) non-immediate control PDUs
2187 * No need to lock around __kfifo_get as long as
2188 * there's one producer and one consumer.
2191 BUG_ON(conn
->ctask
&& conn
->mtask
);
2194 if (iscsi_ctask_xmit(conn
, conn
->ctask
))
2196 /* done with this in-progress ctask */
2200 if (iscsi_mtask_xmit(conn
, conn
->mtask
))
2202 /* done with this in-progress mtask */
2206 /* process immediate first */
2207 if (unlikely(__kfifo_len(conn
->immqueue
))) {
2208 struct iscsi_session
*session
= conn
->session
;
2209 while (__kfifo_get(conn
->immqueue
, (void*)&conn
->mtask
,
2211 if (iscsi_mtask_xmit(conn
, conn
->mtask
))
2214 if (conn
->mtask
->hdr
.itt
==
2215 cpu_to_be32(ISCSI_RESERVED_TAG
)) {
2216 spin_lock_bh(&session
->lock
);
2217 __kfifo_put(session
->mgmtpool
.queue
,
2218 (void*)&conn
->mtask
, sizeof(void*));
2219 spin_unlock_bh(&session
->lock
);
2222 /* done with this mtask */
2226 /* process write queue */
2227 while (__kfifo_get(conn
->writequeue
, (void*)&conn
->ctask
,
2229 if (iscsi_ctask_xmit(conn
, conn
->ctask
))
2233 /* process command queue */
2234 while (__kfifo_get(conn
->xmitqueue
, (void*)&conn
->ctask
,
2236 if (iscsi_ctask_xmit(conn
, conn
->ctask
))
2239 /* done with this ctask */
2242 /* process the rest control plane PDUs, if any */
2243 if (unlikely(__kfifo_len(conn
->mgmtqueue
))) {
2244 struct iscsi_session
*session
= conn
->session
;
2246 while (__kfifo_get(conn
->mgmtqueue
, (void*)&conn
->mtask
,
2248 if (iscsi_mtask_xmit(conn
, conn
->mtask
))
2251 if (conn
->mtask
->hdr
.itt
==
2252 cpu_to_be32(ISCSI_RESERVED_TAG
)) {
2253 spin_lock_bh(&session
->lock
);
2254 __kfifo_put(session
->mgmtpool
.queue
,
2255 (void*)&conn
->mtask
,
2257 spin_unlock_bh(&session
->lock
);
2260 /* done with this mtask */
2267 if (unlikely(conn
->suspend_tx
))
2274 iscsi_xmitworker(void *data
)
2276 struct iscsi_conn
*conn
= data
;
2279 * serialize Xmit worker on a per-connection basis.
2281 down(&conn
->xmitsema
);
2282 if (iscsi_data_xmit(conn
))
2283 schedule_work(&conn
->xmitwork
);
2284 up(&conn
->xmitsema
);
2287 #define FAILURE_BAD_HOST 1
2288 #define FAILURE_SESSION_FAILED 2
2289 #define FAILURE_SESSION_FREED 3
2290 #define FAILURE_WINDOW_CLOSED 4
2291 #define FAILURE_SESSION_TERMINATE 5
2294 iscsi_queuecommand(struct scsi_cmnd
*sc
, void (*done
)(struct scsi_cmnd
*))
2296 struct Scsi_Host
*host
;
2298 struct iscsi_session
*session
;
2299 struct iscsi_conn
*conn
= NULL
;
2300 struct iscsi_cmd_task
*ctask
= NULL
;
2302 sc
->scsi_done
= done
;
2305 host
= sc
->device
->host
;
2306 session
= iscsi_hostdata(host
->hostdata
);
2307 BUG_ON(host
!= session
->host
);
2309 spin_lock(&session
->lock
);
2311 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
2312 if (session
->state
== ISCSI_STATE_FAILED
) {
2313 reason
= FAILURE_SESSION_FAILED
;
2315 } else if (session
->state
== ISCSI_STATE_TERMINATE
) {
2316 reason
= FAILURE_SESSION_TERMINATE
;
2319 reason
= FAILURE_SESSION_FREED
;
2324 * Check for iSCSI window and take care of CmdSN wrap-around
2326 if ((int)(session
->max_cmdsn
- session
->cmdsn
) < 0) {
2327 reason
= FAILURE_WINDOW_CLOSED
;
2331 conn
= session
->leadconn
;
2333 __kfifo_get(session
->cmdpool
.queue
, (void*)&ctask
, sizeof(void*));
2336 sc
->SCp
.phase
= session
->age
;
2337 sc
->SCp
.ptr
= (char*)ctask
;
2338 iscsi_cmd_init(conn
, ctask
, sc
);
2340 __kfifo_put(conn
->xmitqueue
, (void*)&ctask
, sizeof(void*));
2342 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
2343 sc
->sc_data_direction
== DMA_TO_DEVICE
? "write" : "read",
2344 conn
->id
, (long)sc
, ctask
->itt
, sc
->request_bufflen
,
2345 session
->cmdsn
, session
->max_cmdsn
- session
->exp_cmdsn
+ 1);
2346 spin_unlock(&session
->lock
);
2348 if (!in_interrupt() && !down_trylock(&conn
->xmitsema
)) {
2349 spin_unlock_irq(host
->host_lock
);
2350 if (iscsi_data_xmit(conn
))
2351 schedule_work(&conn
->xmitwork
);
2352 up(&conn
->xmitsema
);
2353 spin_lock_irq(host
->host_lock
);
2355 schedule_work(&conn
->xmitwork
);
2360 spin_unlock(&session
->lock
);
2361 debug_scsi("cmd 0x%x rejected (%d)\n", sc
->cmnd
[0], reason
);
2362 return SCSI_MLQUEUE_HOST_BUSY
;
2365 spin_unlock(&session
->lock
);
2366 printk(KERN_ERR
"iscsi_tcp: cmd 0x%x is not queued (%d)\n",
2367 sc
->cmnd
[0], reason
);
2368 sc
->sense_buffer
[0] = 0x70;
2369 sc
->sense_buffer
[2] = NOT_READY
;
2370 sc
->sense_buffer
[7] = 0x6;
2371 sc
->sense_buffer
[12] = 0x08;
2372 sc
->sense_buffer
[13] = 0x00;
2373 sc
->result
= (DID_NO_CONNECT
<< 16);
2374 sc
->resid
= sc
->request_bufflen
;
2380 iscsi_pool_init(struct iscsi_queue
*q
, int max
, void ***items
, int item_size
)
2384 *items
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
2389 q
->pool
= kmalloc(max
* sizeof(void*), GFP_KERNEL
);
2390 if (q
->pool
== NULL
) {
2395 q
->queue
= kfifo_init((void*)q
->pool
, max
* sizeof(void*),
2397 if (q
->queue
== ERR_PTR(-ENOMEM
)) {
2403 for (i
= 0; i
< max
; i
++) {
2404 q
->pool
[i
] = kmalloc(item_size
, GFP_KERNEL
);
2405 if (q
->pool
[i
] == NULL
) {
2408 for (j
= 0; j
< i
; j
++)
2411 kfifo_free(q
->queue
);
2416 memset(q
->pool
[i
], 0, item_size
);
2417 (*items
)[i
] = q
->pool
[i
];
2418 __kfifo_put(q
->queue
, (void*)&q
->pool
[i
], sizeof(void*));
2424 iscsi_pool_free(struct iscsi_queue
*q
, void **items
)
2428 for (i
= 0; i
< q
->max
; i
++)
2434 static iscsi_connh_t
2435 iscsi_conn_create(iscsi_sessionh_t sessionh
, uint32_t conn_idx
)
2437 struct iscsi_session
*session
= iscsi_ptr(sessionh
);
2438 struct iscsi_conn
*conn
= NULL
;
2440 conn
= kmalloc(sizeof(struct iscsi_conn
), GFP_KERNEL
);
2442 goto conn_alloc_fail
;
2443 memset(conn
, 0, sizeof(struct iscsi_conn
));
2445 conn
->c_stage
= ISCSI_CONN_INITIAL_STAGE
;
2446 conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
2447 conn
->id
= conn_idx
;
2448 conn
->exp_statsn
= 0;
2449 conn
->tmabort_state
= TMABORT_INITIAL
;
2451 /* initial operational parameters */
2452 conn
->hdr_size
= sizeof(struct iscsi_hdr
);
2453 conn
->data_size
= DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH
;
2454 conn
->max_recv_dlength
= DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH
;
2456 spin_lock_init(&conn
->lock
);
2458 /* initialize general xmit PDU commands queue */
2459 conn
->xmitqueue
= kfifo_alloc(session
->cmds_max
* sizeof(void*),
2461 if (conn
->xmitqueue
== ERR_PTR(-ENOMEM
))
2462 goto xmitqueue_alloc_fail
;
2464 /* initialize write response PDU commands queue */
2465 conn
->writequeue
= kfifo_alloc(session
->cmds_max
* sizeof(void*),
2467 if (conn
->writequeue
== ERR_PTR(-ENOMEM
))
2468 goto writequeue_alloc_fail
;
2470 /* initialize general immediate & non-immediate PDU commands queue */
2471 conn
->immqueue
= kfifo_alloc(session
->mgmtpool_max
* sizeof(void*),
2473 if (conn
->immqueue
== ERR_PTR(-ENOMEM
))
2474 goto immqueue_alloc_fail
;
2476 conn
->mgmtqueue
= kfifo_alloc(session
->mgmtpool_max
* sizeof(void*),
2478 if (conn
->mgmtqueue
== ERR_PTR(-ENOMEM
))
2479 goto mgmtqueue_alloc_fail
;
2481 INIT_WORK(&conn
->xmitwork
, iscsi_xmitworker
, conn
);
2483 /* allocate login_mtask used for the login/text sequences */
2484 spin_lock_bh(&session
->lock
);
2485 if (!__kfifo_get(session
->mgmtpool
.queue
,
2486 (void*)&conn
->login_mtask
,
2488 spin_unlock_bh(&session
->lock
);
2489 goto login_mtask_alloc_fail
;
2491 spin_unlock_bh(&session
->lock
);
2493 /* allocate initial PDU receive place holder */
2494 if (conn
->data_size
<= PAGE_SIZE
)
2495 conn
->data
= kmalloc(conn
->data_size
, GFP_KERNEL
);
2497 conn
->data
= (void*)__get_free_pages(GFP_KERNEL
,
2498 get_order(conn
->data_size
));
2500 goto max_recv_dlenght_alloc_fail
;
2502 init_timer(&conn
->tmabort_timer
);
2503 init_MUTEX(&conn
->xmitsema
);
2504 init_waitqueue_head(&conn
->ehwait
);
2506 return iscsi_handle(conn
);
2508 max_recv_dlenght_alloc_fail
:
2509 spin_lock_bh(&session
->lock
);
2510 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
2512 spin_unlock_bh(&session
->lock
);
2513 login_mtask_alloc_fail
:
2514 kfifo_free(conn
->mgmtqueue
);
2515 mgmtqueue_alloc_fail
:
2516 kfifo_free(conn
->immqueue
);
2517 immqueue_alloc_fail
:
2518 kfifo_free(conn
->writequeue
);
2519 writequeue_alloc_fail
:
2520 kfifo_free(conn
->xmitqueue
);
2521 xmitqueue_alloc_fail
:
2524 return iscsi_handle(NULL
);
2528 iscsi_conn_destroy(iscsi_connh_t connh
)
2530 struct iscsi_conn
*conn
= iscsi_ptr(connh
);
2531 struct iscsi_session
*session
= conn
->session
;
2533 down(&conn
->xmitsema
);
2534 set_bit(SUSPEND_BIT
, &conn
->suspend_tx
);
2535 if (conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
&& conn
->sock
) {
2536 struct sock
*sk
= conn
->sock
->sk
;
2539 * conn_start() has never been called!
2540 * need to cleanup the socket.
2542 write_lock_bh(&sk
->sk_callback_lock
);
2543 set_bit(SUSPEND_BIT
, &conn
->suspend_rx
);
2544 write_unlock_bh(&sk
->sk_callback_lock
);
2546 sock_hold(conn
->sock
->sk
);
2547 iscsi_conn_restore_callbacks(conn
);
2548 sock_put(conn
->sock
->sk
);
2549 sock_release(conn
->sock
);
2553 spin_lock_bh(&session
->lock
);
2554 conn
->c_stage
= ISCSI_CONN_CLEANUP_WAIT
;
2555 if (session
->leadconn
== conn
) {
2557 * leading connection? then give up on recovery.
2559 session
->state
= ISCSI_STATE_TERMINATE
;
2560 wake_up(&conn
->ehwait
);
2562 spin_unlock_bh(&session
->lock
);
2564 up(&conn
->xmitsema
);
2567 * Block until all in-progress commands for this connection
2571 spin_lock_bh(&conn
->lock
);
2572 if (!session
->host
->host_busy
) { /* OK for ERL == 0 */
2573 spin_unlock_bh(&conn
->lock
);
2576 spin_unlock_bh(&conn
->lock
);
2577 msleep_interruptible(500);
2578 printk("conn_destroy(): host_busy %d host_failed %d\n",
2579 session
->host
->host_busy
, session
->host
->host_failed
);
2581 * force eh_abort() to unblock
2583 wake_up(&conn
->ehwait
);
2586 /* now free crypto */
2587 if (conn
->hdrdgst_en
|| conn
->datadgst_en
) {
2589 crypto_free_tfm(conn
->tx_tfm
);
2591 crypto_free_tfm(conn
->rx_tfm
);
2592 if (conn
->data_tx_tfm
)
2593 crypto_free_tfm(conn
->data_tx_tfm
);
2594 if (conn
->data_rx_tfm
)
2595 crypto_free_tfm(conn
->data_rx_tfm
);
2598 /* free conn->data, size = MaxRecvDataSegmentLength */
2599 if (conn
->data_size
<= PAGE_SIZE
)
2602 free_pages((unsigned long)conn
->data
,
2603 get_order(conn
->data_size
));
2605 spin_lock_bh(&session
->lock
);
2606 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->login_mtask
,
2608 list_del(&conn
->item
);
2609 if (list_empty(&session
->connections
))
2610 session
->leadconn
= NULL
;
2611 if (session
->leadconn
&& session
->leadconn
== conn
)
2612 session
->leadconn
= container_of(session
->connections
.next
,
2613 struct iscsi_conn
, item
);
2615 if (session
->leadconn
== NULL
)
2616 /* none connections exits.. reset sequencing */
2617 session
->cmdsn
= session
->max_cmdsn
= session
->exp_cmdsn
= 1;
2618 spin_unlock_bh(&session
->lock
);
2620 kfifo_free(conn
->xmitqueue
);
2621 kfifo_free(conn
->writequeue
);
2622 kfifo_free(conn
->immqueue
);
2623 kfifo_free(conn
->mgmtqueue
);
2628 iscsi_conn_bind(iscsi_sessionh_t sessionh
, iscsi_connh_t connh
,
2629 uint32_t transport_fd
, int is_leading
)
2631 struct iscsi_session
*session
= iscsi_ptr(sessionh
);
2632 struct iscsi_conn
*tmp
= ERR_PTR(-EEXIST
), *conn
= iscsi_ptr(connh
);
2634 struct socket
*sock
;
2637 /* lookup for existing socket */
2638 sock
= sockfd_lookup(transport_fd
, &err
);
2640 printk(KERN_ERR
"iscsi_tcp: sockfd_lookup failed %d\n", err
);
2644 /* lookup for existing connection */
2645 spin_lock_bh(&session
->lock
);
2646 list_for_each_entry(tmp
, &session
->connections
, item
) {
2648 if (conn
->c_stage
!= ISCSI_CONN_STOPPED
||
2649 conn
->stop_stage
== STOP_CONN_TERM
) {
2650 printk(KERN_ERR
"iscsi_tcp: can't bind "
2651 "non-stopped connection (%d:%d)\n",
2652 conn
->c_stage
, conn
->stop_stage
);
2653 spin_unlock_bh(&session
->lock
);
2660 /* bind new iSCSI connection to session */
2661 conn
->session
= session
;
2663 list_add(&conn
->item
, &session
->connections
);
2665 spin_unlock_bh(&session
->lock
);
2667 if (conn
->stop_stage
!= STOP_CONN_SUSPEND
) {
2668 /* bind iSCSI connection and socket */
2671 /* setup Socket parameters */
2674 sk
->sk_sndtimeo
= 15 * HZ
; /* FIXME: make it configurable */
2675 sk
->sk_allocation
= GFP_ATOMIC
;
2677 /* FIXME: disable Nagle's algorithm */
2680 * Intercept TCP callbacks for sendfile like receive
2683 iscsi_conn_set_callbacks(conn
);
2686 * set receive state machine into initial state
2688 conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
2692 session
->leadconn
= conn
;
2695 * Unblock xmitworker(), Login Phase will pass through.
2697 clear_bit(SUSPEND_BIT
, &conn
->suspend_rx
);
2698 clear_bit(SUSPEND_BIT
, &conn
->suspend_tx
);
2704 iscsi_conn_start(iscsi_connh_t connh
)
2706 struct iscsi_conn
*conn
= iscsi_ptr(connh
);
2707 struct iscsi_session
*session
= conn
->session
;
2710 /* FF phase warming up... */
2712 if (session
== NULL
) {
2713 printk(KERN_ERR
"iscsi_tcp: can't start unbound connection\n");
2717 sk
= conn
->sock
->sk
;
2719 write_lock_bh(&sk
->sk_callback_lock
);
2720 spin_lock_bh(&session
->lock
);
2721 conn
->c_stage
= ISCSI_CONN_STARTED
;
2722 session
->state
= ISCSI_STATE_LOGGED_IN
;
2724 switch(conn
->stop_stage
) {
2725 case STOP_CONN_RECOVER
:
2727 * unblock eh_abort() if it is blocked. re-try all
2728 * commands after successful recovery
2730 session
->conn_cnt
++;
2731 conn
->stop_stage
= 0;
2732 conn
->tmabort_state
= TMABORT_INITIAL
;
2734 wake_up(&conn
->ehwait
);
2736 case STOP_CONN_TERM
:
2737 session
->conn_cnt
++;
2738 conn
->stop_stage
= 0;
2740 case STOP_CONN_SUSPEND
:
2741 conn
->stop_stage
= 0;
2742 clear_bit(SUSPEND_BIT
, &conn
->suspend_rx
);
2743 clear_bit(SUSPEND_BIT
, &conn
->suspend_tx
);
2748 spin_unlock_bh(&session
->lock
);
2749 write_unlock_bh(&sk
->sk_callback_lock
);
2755 iscsi_conn_stop(iscsi_connh_t connh
, int flag
)
2757 struct iscsi_conn
*conn
= iscsi_ptr(connh
);
2758 struct iscsi_session
*session
= conn
->session
;
2760 unsigned long flags
;
2762 BUG_ON(!conn
->sock
);
2763 sk
= conn
->sock
->sk
;
2764 write_lock_bh(&sk
->sk_callback_lock
);
2765 set_bit(SUSPEND_BIT
, &conn
->suspend_rx
);
2766 write_unlock_bh(&sk
->sk_callback_lock
);
2768 down(&conn
->xmitsema
);
2770 spin_lock_irqsave(session
->host
->host_lock
, flags
);
2771 spin_lock(&session
->lock
);
2772 conn
->stop_stage
= flag
;
2773 conn
->c_stage
= ISCSI_CONN_STOPPED
;
2774 set_bit(SUSPEND_BIT
, &conn
->suspend_tx
);
2776 if (flag
!= STOP_CONN_SUSPEND
)
2777 session
->conn_cnt
--;
2779 if (session
->conn_cnt
== 0 || session
->leadconn
== conn
)
2780 session
->state
= ISCSI_STATE_FAILED
;
2782 spin_unlock(&session
->lock
);
2783 spin_unlock_irqrestore(session
->host
->host_lock
, flags
);
2785 if (flag
== STOP_CONN_TERM
|| flag
== STOP_CONN_RECOVER
) {
2786 struct iscsi_cmd_task
*ctask
;
2787 struct iscsi_mgmt_task
*mtask
;
2790 * Socket must go now.
2792 sock_hold(conn
->sock
->sk
);
2793 iscsi_conn_restore_callbacks(conn
);
2794 sock_put(conn
->sock
->sk
);
2797 * flush xmit queues.
2799 spin_lock_bh(&session
->lock
);
2800 while (__kfifo_get(conn
->writequeue
, (void*)&ctask
,
2802 __kfifo_get(conn
->xmitqueue
, (void*)&ctask
,
2804 struct iscsi_r2t_info
*r2t
;
2807 * flush ctask's r2t queues
2809 while (__kfifo_get(ctask
->r2tqueue
, (void*)&r2t
,
2811 __kfifo_put(ctask
->r2tpool
.queue
, (void*)&r2t
,
2814 spin_unlock_bh(&session
->lock
);
2816 iscsi_ctask_cleanup(conn
, ctask
);
2818 spin_lock_bh(&session
->lock
);
2821 while (__kfifo_get(conn
->immqueue
, (void*)&mtask
,
2823 __kfifo_get(conn
->mgmtqueue
, (void*)&mtask
,
2825 __kfifo_put(session
->mgmtpool
.queue
,
2826 (void*)&mtask
, sizeof(void*));
2829 spin_unlock_bh(&session
->lock
);
2832 * release socket only after we stopped data_xmit()
2833 * activity and flushed all outstandings
2835 sock_release(conn
->sock
);
2839 * for connection level recovery we should not calculate
2840 * header digest. conn->hdr_size used for optimization
2841 * in hdr_extract() and will be re-negotiated at
2844 if (flag
== STOP_CONN_RECOVER
)
2845 conn
->hdr_size
= sizeof(struct iscsi_hdr
);
2847 up(&conn
->xmitsema
);
2851 iscsi_conn_send_generic(struct iscsi_conn
*conn
, struct iscsi_hdr
*hdr
,
2852 char *data
, uint32_t data_size
)
2854 struct iscsi_session
*session
= conn
->session
;
2855 struct iscsi_nopout
*nop
= (struct iscsi_nopout
*)hdr
;
2856 struct iscsi_mgmt_task
*mtask
;
2858 spin_lock_bh(&session
->lock
);
2859 if (session
->state
== ISCSI_STATE_TERMINATE
) {
2860 spin_unlock_bh(&session
->lock
);
2863 if (hdr
->opcode
== (ISCSI_OP_LOGIN
| ISCSI_OP_IMMEDIATE
) ||
2864 hdr
->opcode
== (ISCSI_OP_TEXT
| ISCSI_OP_IMMEDIATE
))
2866 * Login and Text are sent serially, in
2867 * request-followed-by-response sequence.
2868 * Same mtask can be used. Same ITT must be used.
2869 * Note that login_mtask is preallocated at conn_create().
2871 mtask
= conn
->login_mtask
;
2873 BUG_ON(conn
->c_stage
== ISCSI_CONN_INITIAL_STAGE
);
2874 BUG_ON(conn
->c_stage
== ISCSI_CONN_STOPPED
);
2876 if (!__kfifo_get(session
->mgmtpool
.queue
,
2877 (void*)&mtask
, sizeof(void*))) {
2878 spin_unlock_bh(&session
->lock
);
2884 * pre-format CmdSN and ExpStatSN for outgoing PDU.
2886 if (hdr
->itt
!= cpu_to_be32(ISCSI_RESERVED_TAG
)) {
2887 hdr
->itt
= mtask
->itt
| (conn
->id
<< CID_SHIFT
) |
2888 (session
->age
<< AGE_SHIFT
);
2889 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
2890 if (conn
->c_stage
== ISCSI_CONN_STARTED
&&
2891 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
2894 /* do not advance CmdSN */
2895 nop
->cmdsn
= cpu_to_be32(session
->cmdsn
);
2897 nop
->exp_statsn
= cpu_to_be32(conn
->exp_statsn
);
2899 memcpy(&mtask
->hdr
, hdr
, sizeof(struct iscsi_hdr
));
2901 iscsi_buf_init_virt(&mtask
->headbuf
, (char*)&mtask
->hdr
,
2902 sizeof(struct iscsi_hdr
));
2904 spin_unlock_bh(&session
->lock
);
2907 memcpy(mtask
->data
, data
, data_size
);
2908 mtask
->data_count
= data_size
;
2910 mtask
->data_count
= 0;
2912 mtask
->xmstate
= XMSTATE_IMM_HDR
;
2914 if (mtask
->data_count
) {
2915 iscsi_buf_init_iov(&mtask
->sendbuf
, (char*)mtask
->data
,
2919 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
2920 hdr
->opcode
, hdr
->itt
, data_size
);
2923 * since send_pdu() could be called at least from two contexts,
2924 * we need to serialize __kfifo_put, so we don't have to take
2925 * additional lock on fast data-path
2927 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
)
2928 __kfifo_put(conn
->immqueue
, (void*)&mtask
, sizeof(void*));
2930 __kfifo_put(conn
->mgmtqueue
, (void*)&mtask
, sizeof(void*));
2932 schedule_work(&conn
->xmitwork
);
2938 iscsi_eh_host_reset(struct scsi_cmnd
*sc
)
2940 struct iscsi_cmd_task
*ctask
= (struct iscsi_cmd_task
*)sc
->SCp
.ptr
;
2941 struct iscsi_conn
*conn
= ctask
->conn
;
2942 struct iscsi_session
*session
= conn
->session
;
2944 spin_lock_bh(&session
->lock
);
2945 if (session
->state
== ISCSI_STATE_TERMINATE
) {
2946 debug_scsi("failing host reset: session terminated "
2947 "[CID %d age %d]", conn
->id
, session
->age
);
2948 spin_unlock_bh(&session
->lock
);
2951 spin_unlock_bh(&session
->lock
);
2953 debug_scsi("failing connection CID %d due to SCSI host reset "
2954 "[itt 0x%x age %d]", conn
->id
, ctask
->itt
,
2956 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
2962 iscsi_tmabort_timedout(unsigned long data
)
2964 struct iscsi_cmd_task
*ctask
= (struct iscsi_cmd_task
*)data
;
2965 struct iscsi_conn
*conn
= ctask
->conn
;
2966 struct iscsi_session
*session
= conn
->session
;
2968 spin_lock(&session
->lock
);
2969 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
2970 __kfifo_put(session
->mgmtpool
.queue
,
2971 (void*)&ctask
->mtask
, sizeof(void*));
2972 conn
->tmabort_state
= TMABORT_TIMEDOUT
;
2973 debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n",
2974 (long)ctask
->sc
, ctask
->itt
);
2975 /* unblock eh_abort() */
2976 wake_up(&conn
->ehwait
);
2978 spin_unlock(&session
->lock
);
2982 iscsi_eh_abort(struct scsi_cmnd
*sc
)
2985 struct iscsi_cmd_task
*ctask
= (struct iscsi_cmd_task
*)sc
->SCp
.ptr
;
2986 struct iscsi_conn
*conn
= ctask
->conn
;
2987 struct iscsi_session
*session
= conn
->session
;
2989 conn
->eh_abort_cnt
++;
2990 debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
2993 * two cases for ERL=0 here:
2995 * 1) connection-level failure;
2996 * 2) recovery due protocol error;
2998 down(&conn
->xmitsema
);
2999 spin_lock_bh(&session
->lock
);
3000 if (session
->state
!= ISCSI_STATE_LOGGED_IN
) {
3001 if (session
->state
== ISCSI_STATE_TERMINATE
) {
3002 spin_unlock_bh(&session
->lock
);
3003 up(&conn
->xmitsema
);
3006 spin_unlock_bh(&session
->lock
);
3008 struct iscsi_tm
*hdr
= &conn
->tmhdr
;
3011 * Still LOGGED_IN...
3014 if (!ctask
->sc
|| sc
->SCp
.phase
!= session
->age
) {
3016 * 1) ctask completed before time out. But session
3017 * is still ok => Happy Retry.
3018 * 2) session was re-open during time out of ctask.
3020 spin_unlock_bh(&session
->lock
);
3021 up(&conn
->xmitsema
);
3024 conn
->tmabort_state
= TMABORT_INITIAL
;
3025 spin_unlock_bh(&session
->lock
);
3028 * ctask timed out but session is OK
3029 * ERL=0 requires task mgmt abort to be issued on each
3030 * failed command. requests must be serialized.
3032 memset(hdr
, 0, sizeof(struct iscsi_tm
));
3033 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC
| ISCSI_OP_IMMEDIATE
;
3034 hdr
->flags
= ISCSI_TM_FUNC_ABORT_TASK
;
3035 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3036 memcpy(hdr
->lun
, ctask
->hdr
.lun
, sizeof(hdr
->lun
));
3037 hdr
->rtt
= ctask
->hdr
.itt
;
3038 hdr
->refcmdsn
= ctask
->hdr
.cmdsn
;
3040 rc
= iscsi_conn_send_generic(conn
, (struct iscsi_hdr
*)hdr
,
3043 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
3044 debug_scsi("abort sent failure [itt 0x%x]", ctask
->itt
);
3046 struct iscsi_r2t_info
*r2t
;
3049 * TMF abort vs. TMF response race logic
3051 spin_lock_bh(&session
->lock
);
3052 ctask
->mtask
= (struct iscsi_mgmt_task
*)
3053 session
->mgmt_cmds
[(hdr
->itt
& ITT_MASK
) -
3054 ISCSI_MGMT_ITT_OFFSET
];
3056 * have to flush r2tqueue to avoid r2t leaks
3058 while (__kfifo_get(ctask
->r2tqueue
, (void*)&r2t
,
3060 __kfifo_put(ctask
->r2tpool
.queue
, (void*)&r2t
,
3063 if (conn
->tmabort_state
== TMABORT_INITIAL
) {
3064 conn
->tmfcmd_pdus_cnt
++;
3065 conn
->tmabort_timer
.expires
= 3*HZ
+ jiffies
;
3066 conn
->tmabort_timer
.function
=
3067 iscsi_tmabort_timedout
;
3068 conn
->tmabort_timer
.data
= (unsigned long)ctask
;
3069 add_timer(&conn
->tmabort_timer
);
3070 debug_scsi("abort sent [itt 0x%x]", ctask
->itt
);
3073 conn
->tmabort_state
== TMABORT_SUCCESS
) {
3074 conn
->tmabort_state
= TMABORT_INITIAL
;
3075 spin_unlock_bh(&session
->lock
);
3076 up(&conn
->xmitsema
);
3079 conn
->tmabort_state
= TMABORT_INITIAL
;
3080 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
3082 spin_unlock_bh(&session
->lock
);
3085 up(&conn
->xmitsema
);
3089 * block eh thread until:
3091 * 1) abort response;
3093 * 3) session re-opened;
3094 * 4) session terminated;
3097 int p_state
= session
->state
;
3099 rc
= wait_event_interruptible(conn
->ehwait
,
3100 (p_state
== ISCSI_STATE_LOGGED_IN
?
3101 (session
->state
== ISCSI_STATE_TERMINATE
||
3102 conn
->tmabort_state
!= TMABORT_INITIAL
) :
3103 (session
->state
== ISCSI_STATE_TERMINATE
||
3104 session
->state
== ISCSI_STATE_LOGGED_IN
)));
3107 session
->state
= ISCSI_STATE_TERMINATE
;
3111 if (signal_pending(current
))
3112 flush_signals(current
);
3114 if (session
->state
== ISCSI_STATE_TERMINATE
)
3117 spin_lock_bh(&session
->lock
);
3118 if (sc
->SCp
.phase
== session
->age
&&
3119 (conn
->tmabort_state
== TMABORT_TIMEDOUT
||
3120 conn
->tmabort_state
== TMABORT_FAILED
)) {
3121 conn
->tmabort_state
= TMABORT_INITIAL
;
3124 * ctask completed before tmf abort response or
3126 * But session is still ok => Happy Retry.
3128 spin_unlock_bh(&session
->lock
);
3131 spin_unlock_bh(&session
->lock
);
3132 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
3135 spin_unlock_bh(&session
->lock
);
3140 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
3145 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc
, ctask
->itt
);
3149 del_timer_sync(&conn
->tmabort_timer
);
3151 down(&conn
->xmitsema
);
3153 struct sock
*sk
= conn
->sock
->sk
;
3155 write_lock_bh(&sk
->sk_callback_lock
);
3156 iscsi_ctask_cleanup(conn
, ctask
);
3157 write_unlock_bh(&sk
->sk_callback_lock
);
3159 up(&conn
->xmitsema
);
3164 iscsi_r2tpool_alloc(struct iscsi_session
*session
)
3170 * initialize per-task: R2T pool and xmit queue
3172 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
3173 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
3176 * pre-allocated x4 as much r2ts to handle race when
3177 * target acks DataOut faster than we data_xmit() queues
3178 * could replenish r2tqueue.
3182 if (iscsi_pool_init(&ctask
->r2tpool
, session
->max_r2t
* 4,
3183 (void***)&ctask
->r2ts
, sizeof(struct iscsi_r2t_info
))) {
3184 goto r2t_alloc_fail
;
3187 /* R2T xmit queue */
3188 ctask
->r2tqueue
= kfifo_alloc(
3189 session
->max_r2t
* 4 * sizeof(void*), GFP_KERNEL
, NULL
);
3190 if (ctask
->r2tqueue
== ERR_PTR(-ENOMEM
)) {
3191 iscsi_pool_free(&ctask
->r2tpool
, (void**)ctask
->r2ts
);
3192 goto r2t_alloc_fail
;
3197 * Data-Out PDU's within R2T-sequence can be quite big;
3200 ctask
->datapool
= mempool_create(ISCSI_DTASK_DEFAULT_MAX
,
3201 mempool_alloc_slab
, mempool_free_slab
, taskcache
);
3202 if (ctask
->datapool
== NULL
) {
3203 kfifo_free(ctask
->r2tqueue
);
3204 iscsi_pool_free(&ctask
->r2tpool
, (void**)ctask
->r2ts
);
3205 goto r2t_alloc_fail
;
3207 INIT_LIST_HEAD(&ctask
->dataqueue
);
3213 for (i
= 0; i
< cmd_i
; i
++) {
3214 mempool_destroy(session
->cmds
[i
]->datapool
);
3215 kfifo_free(session
->cmds
[i
]->r2tqueue
);
3216 iscsi_pool_free(&session
->cmds
[i
]->r2tpool
,
3217 (void**)session
->cmds
[i
]->r2ts
);
3223 iscsi_r2tpool_free(struct iscsi_session
*session
)
3227 for (i
= 0; i
< session
->cmds_max
; i
++) {
3228 mempool_destroy(session
->cmds
[i
]->datapool
);
3229 kfifo_free(session
->cmds
[i
]->r2tqueue
);
3230 iscsi_pool_free(&session
->cmds
[i
]->r2tpool
,
3231 (void**)session
->cmds
[i
]->r2ts
);
3235 static struct scsi_host_template iscsi_sht
= {
3236 .name
= "iSCSI Initiator over TCP/IP, v."
3238 .queuecommand
= iscsi_queuecommand
,
3239 .can_queue
= ISCSI_XMIT_CMDS_MAX
- 1,
3240 .sg_tablesize
= ISCSI_SG_TABLESIZE
,
3241 .cmd_per_lun
= ISCSI_CMD_PER_LUN
,
3242 .eh_abort_handler
= iscsi_eh_abort
,
3243 .eh_host_reset_handler
= iscsi_eh_host_reset
,
3244 .use_clustering
= DISABLE_CLUSTERING
,
3245 .proc_name
= "iscsi_tcp",
3249 static iscsi_sessionh_t
3250 iscsi_session_create(uint32_t initial_cmdsn
, struct Scsi_Host
*host
)
3253 struct iscsi_session
*session
;
3255 session
= iscsi_hostdata(host
->hostdata
);
3256 memset(session
, 0, sizeof(struct iscsi_session
));
3258 session
->host
= host
;
3259 session
->id
= host
->host_no
;
3260 session
->state
= ISCSI_STATE_LOGGED_IN
;
3261 session
->mgmtpool_max
= ISCSI_MGMT_CMDS_MAX
;
3262 session
->cmds_max
= ISCSI_XMIT_CMDS_MAX
;
3263 session
->cmdsn
= initial_cmdsn
;
3264 session
->exp_cmdsn
= initial_cmdsn
+ 1;
3265 session
->max_cmdsn
= initial_cmdsn
+ 1;
3266 session
->max_r2t
= 1;
3268 /* initialize SCSI PDU commands pool */
3269 if (iscsi_pool_init(&session
->cmdpool
, session
->cmds_max
,
3270 (void***)&session
->cmds
, sizeof(struct iscsi_cmd_task
)))
3271 goto cmdpool_alloc_fail
;
3273 /* pre-format cmds pool with ITT */
3274 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++)
3275 session
->cmds
[cmd_i
]->itt
= cmd_i
;
3277 spin_lock_init(&session
->lock
);
3278 INIT_LIST_HEAD(&session
->connections
);
3280 /* initialize immediate command pool */
3281 if (iscsi_pool_init(&session
->mgmtpool
, session
->mgmtpool_max
,
3282 (void***)&session
->mgmt_cmds
, sizeof(struct iscsi_mgmt_task
)))
3283 goto mgmtpool_alloc_fail
;
3286 /* pre-format immediate cmds pool with ITT */
3287 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++) {
3288 session
->mgmt_cmds
[cmd_i
]->itt
= ISCSI_MGMT_ITT_OFFSET
+ cmd_i
;
3289 session
->mgmt_cmds
[cmd_i
]->data
= kmalloc(
3290 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH
, GFP_KERNEL
);
3291 if (!session
->mgmt_cmds
[cmd_i
]->data
) {
3294 for (j
= 0; j
< cmd_i
; j
++)
3295 kfree(session
->mgmt_cmds
[j
]->data
);
3296 goto immdata_alloc_fail
;
3300 if (iscsi_r2tpool_alloc(session
))
3301 goto r2tpool_alloc_fail
;
3303 return iscsi_handle(session
);
3306 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++)
3307 kfree(session
->mgmt_cmds
[cmd_i
]->data
);
3308 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
3310 mgmtpool_alloc_fail
:
3311 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
3313 return iscsi_handle(NULL
);
3317 iscsi_session_destroy(iscsi_sessionh_t sessionh
)
3320 struct iscsi_data_task
*dtask
, *n
;
3321 struct iscsi_session
*session
= iscsi_ptr(sessionh
);
3323 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
3324 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
3325 list_for_each_entry_safe(dtask
, n
, &ctask
->dataqueue
, item
) {
3326 list_del(&dtask
->item
);
3327 mempool_free(dtask
, ctask
->datapool
);
3331 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++)
3332 kfree(session
->mgmt_cmds
[cmd_i
]->data
);
3334 iscsi_r2tpool_free(session
);
3335 iscsi_pool_free(&session
->mgmtpool
, (void**)session
->mgmt_cmds
);
3336 iscsi_pool_free(&session
->cmdpool
, (void**)session
->cmds
);
3340 iscsi_conn_set_param(iscsi_connh_t connh
, enum iscsi_param param
,
3343 struct iscsi_conn
*conn
= iscsi_ptr(connh
);
3344 struct iscsi_session
*session
= conn
->session
;
3346 spin_lock_bh(&session
->lock
);
3347 if (conn
->c_stage
!= ISCSI_CONN_INITIAL_STAGE
&&
3348 conn
->stop_stage
!= STOP_CONN_RECOVER
) {
3349 printk(KERN_ERR
"iscsi_tcp: can not change parameter [%d]\n",
3351 spin_unlock_bh(&session
->lock
);
3354 spin_unlock_bh(&session
->lock
);
3357 case ISCSI_PARAM_MAX_RECV_DLENGTH
: {
3358 char *saveptr
= conn
->data
;
3359 int flags
= GFP_KERNEL
;
3361 if (conn
->data_size
>= value
) {
3362 conn
->max_recv_dlength
= value
;
3366 spin_lock_bh(&session
->lock
);
3367 if (conn
->stop_stage
== STOP_CONN_RECOVER
)
3369 spin_unlock_bh(&session
->lock
);
3371 if (value
<= PAGE_SIZE
)
3372 conn
->data
= kmalloc(value
, flags
);
3374 conn
->data
= (void*)__get_free_pages(flags
,
3376 if (conn
->data
== NULL
) {
3377 conn
->data
= saveptr
;
3380 if (conn
->data_size
<= PAGE_SIZE
)
3383 free_pages((unsigned long)saveptr
,
3384 get_order(conn
->data_size
));
3385 conn
->max_recv_dlength
= value
;
3386 conn
->data_size
= value
;
3389 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
3390 conn
->max_xmit_dlength
= value
;
3392 case ISCSI_PARAM_HDRDGST_EN
:
3393 conn
->hdrdgst_en
= value
;
3394 conn
->hdr_size
= sizeof(struct iscsi_hdr
);
3395 if (conn
->hdrdgst_en
) {
3396 conn
->hdr_size
+= sizeof(__u32
);
3398 conn
->tx_tfm
= crypto_alloc_tfm("crc32c", 0);
3402 conn
->rx_tfm
= crypto_alloc_tfm("crc32c", 0);
3403 if (!conn
->rx_tfm
) {
3404 crypto_free_tfm(conn
->tx_tfm
);
3409 crypto_free_tfm(conn
->tx_tfm
);
3411 crypto_free_tfm(conn
->rx_tfm
);
3414 case ISCSI_PARAM_DATADGST_EN
:
3415 conn
->datadgst_en
= value
;
3416 if (conn
->datadgst_en
) {
3417 if (!conn
->data_tx_tfm
)
3419 crypto_alloc_tfm("crc32c", 0);
3420 if (!conn
->data_tx_tfm
)
3422 if (!conn
->data_rx_tfm
)
3424 crypto_alloc_tfm("crc32c", 0);
3425 if (!conn
->data_rx_tfm
) {
3426 crypto_free_tfm(conn
->data_tx_tfm
);
3430 if (conn
->data_tx_tfm
)
3431 crypto_free_tfm(conn
->data_tx_tfm
);
3432 if (conn
->data_rx_tfm
)
3433 crypto_free_tfm(conn
->data_rx_tfm
);
3436 case ISCSI_PARAM_INITIAL_R2T_EN
:
3437 session
->initial_r2t_en
= value
;
3439 case ISCSI_PARAM_MAX_R2T
:
3440 if (session
->max_r2t
== roundup_pow_of_two(value
))
3442 iscsi_r2tpool_free(session
);
3443 session
->max_r2t
= value
;
3444 if (session
->max_r2t
& (session
->max_r2t
- 1))
3445 session
->max_r2t
= roundup_pow_of_two(session
->max_r2t
);
3446 if (iscsi_r2tpool_alloc(session
))
3449 case ISCSI_PARAM_IMM_DATA_EN
:
3450 session
->imm_data_en
= value
;
3452 case ISCSI_PARAM_FIRST_BURST
:
3453 session
->first_burst
= value
;
3455 case ISCSI_PARAM_MAX_BURST
:
3456 session
->max_burst
= value
;
3458 case ISCSI_PARAM_PDU_INORDER_EN
:
3459 session
->pdu_inorder_en
= value
;
3461 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
3462 session
->dataseq_inorder_en
= value
;
3464 case ISCSI_PARAM_ERL
:
3465 session
->erl
= value
;
3467 case ISCSI_PARAM_IFMARKER_EN
:
3469 session
->ifmarker_en
= value
;
3471 case ISCSI_PARAM_OFMARKER_EN
:
3473 session
->ofmarker_en
= value
;
3483 iscsi_conn_get_param(iscsi_connh_t connh
, enum iscsi_param param
,
3486 struct iscsi_conn
*conn
= iscsi_ptr(connh
);
3487 struct iscsi_session
*session
= conn
->session
;
3490 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
3491 *value
= conn
->max_recv_dlength
;
3493 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
3494 *value
= conn
->max_xmit_dlength
;
3496 case ISCSI_PARAM_HDRDGST_EN
:
3497 *value
= conn
->hdrdgst_en
;
3499 case ISCSI_PARAM_DATADGST_EN
:
3500 *value
= conn
->datadgst_en
;
3502 case ISCSI_PARAM_INITIAL_R2T_EN
:
3503 *value
= session
->initial_r2t_en
;
3505 case ISCSI_PARAM_MAX_R2T
:
3506 *value
= session
->max_r2t
;
3508 case ISCSI_PARAM_IMM_DATA_EN
:
3509 *value
= session
->imm_data_en
;
3511 case ISCSI_PARAM_FIRST_BURST
:
3512 *value
= session
->first_burst
;
3514 case ISCSI_PARAM_MAX_BURST
:
3515 *value
= session
->max_burst
;
3517 case ISCSI_PARAM_PDU_INORDER_EN
:
3518 *value
= session
->pdu_inorder_en
;
3520 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
3521 *value
= session
->dataseq_inorder_en
;
3523 case ISCSI_PARAM_ERL
:
3524 *value
= session
->erl
;
3526 case ISCSI_PARAM_IFMARKER_EN
:
3527 *value
= session
->ifmarker_en
;
3529 case ISCSI_PARAM_OFMARKER_EN
:
3530 *value
= session
->ofmarker_en
;
3533 return ISCSI_ERR_PARAM_NOT_FOUND
;
3540 iscsi_conn_get_stats(iscsi_connh_t connh
, struct iscsi_stats
*stats
)
3542 struct iscsi_conn
*conn
= iscsi_ptr(connh
);
3544 stats
->txdata_octets
= conn
->txdata_octets
;
3545 stats
->rxdata_octets
= conn
->rxdata_octets
;
3546 stats
->scsicmd_pdus
= conn
->scsicmd_pdus_cnt
;
3547 stats
->dataout_pdus
= conn
->dataout_pdus_cnt
;
3548 stats
->scsirsp_pdus
= conn
->scsirsp_pdus_cnt
;
3549 stats
->datain_pdus
= conn
->datain_pdus_cnt
;
3550 stats
->r2t_pdus
= conn
->r2t_pdus_cnt
;
3551 stats
->tmfcmd_pdus
= conn
->tmfcmd_pdus_cnt
;
3552 stats
->tmfrsp_pdus
= conn
->tmfrsp_pdus_cnt
;
3553 stats
->custom_length
= 3;
3554 strcpy(stats
->custom
[0].desc
, "tx_sendpage_failures");
3555 stats
->custom
[0].value
= conn
->sendpage_failures_cnt
;
3556 strcpy(stats
->custom
[1].desc
, "rx_discontiguous_hdr");
3557 stats
->custom
[1].value
= conn
->discontiguous_hdr_cnt
;
3558 strcpy(stats
->custom
[2].desc
, "eh_abort_cnt");
3559 stats
->custom
[2].value
= conn
->eh_abort_cnt
;
3563 iscsi_conn_send_pdu(iscsi_connh_t connh
, struct iscsi_hdr
*hdr
, char *data
,
3566 struct iscsi_conn
*conn
= iscsi_ptr(connh
);
3569 down(&conn
->xmitsema
);
3570 rc
= iscsi_conn_send_generic(conn
, hdr
, data
, data_size
);
3571 up(&conn
->xmitsema
);
3576 static struct iscsi_transport iscsi_tcp_transport
= {
3577 .owner
= THIS_MODULE
,
3579 .caps
= CAP_RECOVERY_L0
| CAP_MULTI_R2T
| CAP_HDRDGST
3581 .host_template
= &iscsi_sht
,
3582 .hostdata_size
= sizeof(struct iscsi_session
),
3584 .max_cmd_len
= ISCSI_TCP_MAX_CMD_LEN
,
3585 .create_session
= iscsi_session_create
,
3586 .destroy_session
= iscsi_session_destroy
,
3587 .create_conn
= iscsi_conn_create
,
3588 .bind_conn
= iscsi_conn_bind
,
3589 .destroy_conn
= iscsi_conn_destroy
,
3590 .set_param
= iscsi_conn_set_param
,
3591 .get_param
= iscsi_conn_get_param
,
3592 .start_conn
= iscsi_conn_start
,
3593 .stop_conn
= iscsi_conn_stop
,
3594 .send_pdu
= iscsi_conn_send_pdu
,
3595 .get_stats
= iscsi_conn_get_stats
,
3599 iscsi_tcp_init(void)
3603 if (iscsi_max_lun
< 1) {
3604 printk(KERN_ERR
"Invalid max_lun value of %u\n", iscsi_max_lun
);
3607 iscsi_tcp_transport
.max_lun
= iscsi_max_lun
;
3609 taskcache
= kmem_cache_create("iscsi_taskcache",
3610 sizeof(struct iscsi_data_task
), 0,
3611 SLAB_HWCACHE_ALIGN
| SLAB_NO_REAP
, NULL
, NULL
);
3615 error
= iscsi_register_transport(&iscsi_tcp_transport
);
3617 kmem_cache_destroy(taskcache
);
3623 iscsi_tcp_exit(void)
3625 iscsi_unregister_transport(&iscsi_tcp_transport
);
3626 kmem_cache_destroy(taskcache
);
3629 module_init(iscsi_tcp_init
);
3630 module_exit(iscsi_tcp_exit
);