2 * iSCSI Initiator over TCP/IP Data-Path
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 - 2006 Mike Christie
7 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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
12 * by 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, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * See the file COPYING included with this distribution for more details.
29 #include <linux/types.h>
30 #include <linux/list.h>
31 #include <linux/inet.h>
32 #include <linux/file.h>
33 #include <linux/blkdev.h>
34 #include <linux/crypto.h>
35 #include <linux/delay.h>
36 #include <linux/kfifo.h>
37 #include <linux/scatterlist.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_host.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_transport_iscsi.h>
45 #include "iscsi_tcp.h"
47 MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
48 "Alex Aizman <itn780@yahoo.com>");
49 MODULE_DESCRIPTION("iSCSI/TCP data-path");
50 MODULE_LICENSE("GPL");
51 /* #define DEBUG_TCP */
55 #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
57 #define debug_tcp(fmt...)
67 static unsigned int iscsi_max_lun
= 512;
68 module_param_named(max_lun
, iscsi_max_lun
, uint
, S_IRUGO
);
71 iscsi_buf_init_iov(struct iscsi_buf
*ibuf
, char *vbuf
, int size
)
73 sg_init_one(&ibuf
->sg
, vbuf
, size
);
75 ibuf
->use_sendmsg
= 1;
79 iscsi_buf_init_sg(struct iscsi_buf
*ibuf
, struct scatterlist
*sg
)
81 sg_init_table(&ibuf
->sg
, 1);
82 sg_set_page(&ibuf
->sg
, sg_page(sg
), sg
->length
, sg
->offset
);
84 * Fastpath: sg element fits into single page
86 if (sg
->length
+ sg
->offset
<= PAGE_SIZE
&& !PageSlab(sg_page(sg
)))
87 ibuf
->use_sendmsg
= 0;
89 ibuf
->use_sendmsg
= 1;
94 iscsi_buf_left(struct iscsi_buf
*ibuf
)
98 rc
= ibuf
->sg
.length
- ibuf
->sent
;
104 iscsi_hdr_digest(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
,
107 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
109 crypto_hash_digest(&tcp_conn
->tx_hash
, &buf
->sg
, buf
->sg
.length
, crc
);
110 buf
->sg
.length
+= sizeof(u32
);
114 iscsi_hdr_extract(struct iscsi_tcp_conn
*tcp_conn
)
116 struct sk_buff
*skb
= tcp_conn
->in
.skb
;
118 tcp_conn
->in
.zero_copy_hdr
= 0;
120 if (tcp_conn
->in
.copy
>= tcp_conn
->hdr_size
&&
121 tcp_conn
->in_progress
== IN_PROGRESS_WAIT_HEADER
) {
123 * Zero-copy PDU Header: using connection context
124 * to store header pointer.
126 if (skb_shinfo(skb
)->frag_list
== NULL
&&
127 !skb_shinfo(skb
)->nr_frags
) {
128 tcp_conn
->in
.hdr
= (struct iscsi_hdr
*)
129 ((char*)skb
->data
+ tcp_conn
->in
.offset
);
130 tcp_conn
->in
.zero_copy_hdr
= 1;
132 /* ignoring return code since we checked
134 skb_copy_bits(skb
, tcp_conn
->in
.offset
,
135 &tcp_conn
->hdr
, tcp_conn
->hdr_size
);
136 tcp_conn
->in
.hdr
= &tcp_conn
->hdr
;
138 tcp_conn
->in
.offset
+= tcp_conn
->hdr_size
;
139 tcp_conn
->in
.copy
-= tcp_conn
->hdr_size
;
145 * PDU header scattered across SKB's,
146 * copying it... This'll happen quite rarely.
149 if (tcp_conn
->in_progress
== IN_PROGRESS_WAIT_HEADER
)
150 tcp_conn
->in
.hdr_offset
= 0;
152 hdr_remains
= tcp_conn
->hdr_size
- tcp_conn
->in
.hdr_offset
;
153 BUG_ON(hdr_remains
<= 0);
155 copylen
= min(tcp_conn
->in
.copy
, hdr_remains
);
156 skb_copy_bits(skb
, tcp_conn
->in
.offset
,
157 (char*)&tcp_conn
->hdr
+ tcp_conn
->in
.hdr_offset
,
160 debug_tcp("PDU gather offset %d bytes %d in.offset %d "
161 "in.copy %d\n", tcp_conn
->in
.hdr_offset
, copylen
,
162 tcp_conn
->in
.offset
, tcp_conn
->in
.copy
);
164 tcp_conn
->in
.offset
+= copylen
;
165 tcp_conn
->in
.copy
-= copylen
;
166 if (copylen
< hdr_remains
) {
167 tcp_conn
->in_progress
= IN_PROGRESS_HEADER_GATHER
;
168 tcp_conn
->in
.hdr_offset
+= copylen
;
171 tcp_conn
->in
.hdr
= &tcp_conn
->hdr
;
172 tcp_conn
->discontiguous_hdr_cnt
++;
173 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
180 * must be called with session lock
183 iscsi_tcp_cleanup_ctask(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
185 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
186 struct iscsi_r2t_info
*r2t
;
187 struct scsi_cmnd
*sc
;
189 /* flush ctask's r2t queues */
190 while (__kfifo_get(tcp_ctask
->r2tqueue
, (void*)&r2t
, sizeof(void*))) {
191 __kfifo_put(tcp_ctask
->r2tpool
.queue
, (void*)&r2t
,
193 debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
200 tcp_ctask
->xmstate
= XMSTATE_IDLE
;
201 tcp_ctask
->r2t
= NULL
;
205 * iscsi_data_rsp - SCSI Data-In Response processing
206 * @conn: iscsi connection
207 * @ctask: scsi command task
210 iscsi_data_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
212 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
213 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
214 struct iscsi_data_rsp
*rhdr
= (struct iscsi_data_rsp
*)tcp_conn
->in
.hdr
;
215 struct iscsi_session
*session
= conn
->session
;
216 struct scsi_cmnd
*sc
= ctask
->sc
;
217 int datasn
= be32_to_cpu(rhdr
->datasn
);
219 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
221 * setup Data-In byte counter (gets decremented..)
223 ctask
->data_count
= tcp_conn
->in
.datalen
;
225 if (tcp_conn
->in
.datalen
== 0)
228 if (tcp_ctask
->exp_datasn
!= datasn
) {
229 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n",
230 __FUNCTION__
, tcp_ctask
->exp_datasn
, datasn
);
231 return ISCSI_ERR_DATASN
;
234 tcp_ctask
->exp_datasn
++;
236 tcp_ctask
->data_offset
= be32_to_cpu(rhdr
->offset
);
237 if (tcp_ctask
->data_offset
+ tcp_conn
->in
.datalen
> scsi_bufflen(sc
)) {
238 debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
239 __FUNCTION__
, tcp_ctask
->data_offset
,
240 tcp_conn
->in
.datalen
, scsi_bufflen(sc
));
241 return ISCSI_ERR_DATA_OFFSET
;
244 if (rhdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
245 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
246 if (rhdr
->flags
& ISCSI_FLAG_DATA_UNDERFLOW
) {
247 int res_count
= be32_to_cpu(rhdr
->residual_count
);
250 res_count
<= scsi_bufflen(sc
)) {
251 scsi_set_resid(sc
, res_count
);
252 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
254 sc
->result
= (DID_BAD_TARGET
<< 16) |
256 } else if (rhdr
->flags
& ISCSI_FLAG_DATA_OVERFLOW
) {
257 scsi_set_resid(sc
, be32_to_cpu(rhdr
->residual_count
));
258 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
260 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
263 conn
->datain_pdus_cnt
++;
268 * iscsi_solicit_data_init - initialize first Data-Out
269 * @conn: iscsi connection
270 * @ctask: scsi command task
274 * Initialize first Data-Out within this R2T sequence and finds
275 * proper data_offset within this SCSI command.
277 * This function is called with connection lock taken.
280 iscsi_solicit_data_init(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
281 struct iscsi_r2t_info
*r2t
)
283 struct iscsi_data
*hdr
;
284 struct scsi_cmnd
*sc
= ctask
->sc
;
286 struct scatterlist
*sg
;
288 hdr
= &r2t
->dtask
.hdr
;
289 memset(hdr
, 0, sizeof(struct iscsi_data
));
291 hdr
->datasn
= cpu_to_be32(r2t
->solicit_datasn
);
292 r2t
->solicit_datasn
++;
293 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
294 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
295 hdr
->itt
= ctask
->hdr
->itt
;
296 hdr
->exp_statsn
= r2t
->exp_statsn
;
297 hdr
->offset
= cpu_to_be32(r2t
->data_offset
);
298 if (r2t
->data_length
> conn
->max_xmit_dlength
) {
299 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
300 r2t
->data_count
= conn
->max_xmit_dlength
;
303 hton24(hdr
->dlength
, r2t
->data_length
);
304 r2t
->data_count
= r2t
->data_length
;
305 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
307 conn
->dataout_pdus_cnt
++;
311 iscsi_buf_init_iov(&r2t
->headbuf
, (char*)hdr
,
312 sizeof(struct iscsi_hdr
));
314 sg
= scsi_sglist(sc
);
316 for (i
= 0; i
< scsi_sg_count(sc
); i
++, sg
+= 1) {
317 /* FIXME: prefetch ? */
318 if (sg_count
+ sg
->length
> r2t
->data_offset
) {
323 /* offset within this page */
324 page_offset
= r2t
->data_offset
- sg_count
;
326 /* fill in this buffer */
327 iscsi_buf_init_sg(&r2t
->sendbuf
, sg
);
328 r2t
->sendbuf
.sg
.offset
+= page_offset
;
329 r2t
->sendbuf
.sg
.length
-= page_offset
;
331 /* xmit logic will continue with next one */
335 sg_count
+= sg
->length
;
337 BUG_ON(r2t
->sg
== NULL
);
341 * iscsi_r2t_rsp - iSCSI R2T Response processing
342 * @conn: iscsi connection
343 * @ctask: scsi command task
346 iscsi_r2t_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
348 struct iscsi_r2t_info
*r2t
;
349 struct iscsi_session
*session
= conn
->session
;
350 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
351 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
352 struct iscsi_r2t_rsp
*rhdr
= (struct iscsi_r2t_rsp
*)tcp_conn
->in
.hdr
;
353 int r2tsn
= be32_to_cpu(rhdr
->r2tsn
);
356 if (tcp_conn
->in
.datalen
) {
357 printk(KERN_ERR
"iscsi_tcp: invalid R2t with datalen %d\n",
358 tcp_conn
->in
.datalen
);
359 return ISCSI_ERR_DATALEN
;
362 if (tcp_ctask
->exp_datasn
!= r2tsn
){
363 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
364 __FUNCTION__
, tcp_ctask
->exp_datasn
, r2tsn
);
365 return ISCSI_ERR_R2TSN
;
368 /* fill-in new R2T associated with the task */
369 spin_lock(&session
->lock
);
370 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
372 if (!ctask
->sc
|| ctask
->mtask
||
373 session
->state
!= ISCSI_STATE_LOGGED_IN
) {
374 printk(KERN_INFO
"iscsi_tcp: dropping R2T itt %d in "
375 "recovery...\n", ctask
->itt
);
376 spin_unlock(&session
->lock
);
380 rc
= __kfifo_get(tcp_ctask
->r2tpool
.queue
, (void*)&r2t
, sizeof(void*));
383 r2t
->exp_statsn
= rhdr
->statsn
;
384 r2t
->data_length
= be32_to_cpu(rhdr
->data_length
);
385 if (r2t
->data_length
== 0) {
386 printk(KERN_ERR
"iscsi_tcp: invalid R2T with zero data len\n");
387 spin_unlock(&session
->lock
);
388 return ISCSI_ERR_DATALEN
;
391 if (r2t
->data_length
> session
->max_burst
)
392 debug_scsi("invalid R2T with data len %u and max burst %u."
393 "Attempting to execute request.\n",
394 r2t
->data_length
, session
->max_burst
);
396 r2t
->data_offset
= be32_to_cpu(rhdr
->data_offset
);
397 if (r2t
->data_offset
+ r2t
->data_length
> scsi_bufflen(ctask
->sc
)) {
398 spin_unlock(&session
->lock
);
399 printk(KERN_ERR
"iscsi_tcp: invalid R2T with data len %u at "
400 "offset %u and total length %d\n", r2t
->data_length
,
401 r2t
->data_offset
, scsi_bufflen(ctask
->sc
));
402 return ISCSI_ERR_DATALEN
;
405 r2t
->ttt
= rhdr
->ttt
; /* no flip */
406 r2t
->solicit_datasn
= 0;
408 iscsi_solicit_data_init(conn
, ctask
, r2t
);
410 tcp_ctask
->exp_datasn
= r2tsn
+ 1;
411 __kfifo_put(tcp_ctask
->r2tqueue
, (void*)&r2t
, sizeof(void*));
412 tcp_ctask
->xmstate
|= XMSTATE_SOL_HDR_INIT
;
413 list_move_tail(&ctask
->running
, &conn
->xmitqueue
);
415 scsi_queue_work(session
->host
, &conn
->xmitwork
);
416 conn
->r2t_pdus_cnt
++;
417 spin_unlock(&session
->lock
);
423 iscsi_tcp_hdr_recv(struct iscsi_conn
*conn
)
425 int rc
= 0, opcode
, ahslen
;
426 struct iscsi_hdr
*hdr
;
427 struct iscsi_session
*session
= conn
->session
;
428 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
429 uint32_t cdgst
, rdgst
= 0, itt
;
431 hdr
= tcp_conn
->in
.hdr
;
433 /* verify PDU length */
434 tcp_conn
->in
.datalen
= ntoh24(hdr
->dlength
);
435 if (tcp_conn
->in
.datalen
> conn
->max_recv_dlength
) {
436 printk(KERN_ERR
"iscsi_tcp: datalen %d > %d\n",
437 tcp_conn
->in
.datalen
, conn
->max_recv_dlength
);
438 return ISCSI_ERR_DATALEN
;
440 tcp_conn
->data_copied
= 0;
443 ahslen
= hdr
->hlength
<< 2;
444 tcp_conn
->in
.offset
+= ahslen
;
445 tcp_conn
->in
.copy
-= ahslen
;
446 if (tcp_conn
->in
.copy
< 0) {
447 printk(KERN_ERR
"iscsi_tcp: can't handle AHS with length "
448 "%d bytes\n", ahslen
);
449 return ISCSI_ERR_AHSLEN
;
452 /* calculate read padding */
453 tcp_conn
->in
.padding
= tcp_conn
->in
.datalen
& (ISCSI_PAD_LEN
-1);
454 if (tcp_conn
->in
.padding
) {
455 tcp_conn
->in
.padding
= ISCSI_PAD_LEN
- tcp_conn
->in
.padding
;
456 debug_scsi("read padding %d bytes\n", tcp_conn
->in
.padding
);
459 if (conn
->hdrdgst_en
) {
460 struct scatterlist sg
;
462 sg_init_one(&sg
, (u8
*)hdr
,
463 sizeof(struct iscsi_hdr
) + ahslen
);
464 crypto_hash_digest(&tcp_conn
->rx_hash
, &sg
, sg
.length
,
466 rdgst
= *(uint32_t*)((char*)hdr
+ sizeof(struct iscsi_hdr
) +
468 if (cdgst
!= rdgst
) {
469 printk(KERN_ERR
"iscsi_tcp: hdrdgst error "
470 "recv 0x%x calc 0x%x\n", rdgst
, cdgst
);
471 return ISCSI_ERR_HDR_DGST
;
475 opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
;
476 /* verify itt (itt encoding: age+cid+itt) */
477 rc
= iscsi_verify_itt(conn
, hdr
, &itt
);
478 if (rc
== ISCSI_ERR_NO_SCSI_CMD
) {
479 tcp_conn
->in
.datalen
= 0; /* force drop */
484 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
485 opcode
, tcp_conn
->in
.offset
, tcp_conn
->in
.copy
,
486 ahslen
, tcp_conn
->in
.datalen
);
489 case ISCSI_OP_SCSI_DATA_IN
:
490 tcp_conn
->in
.ctask
= session
->cmds
[itt
];
491 rc
= iscsi_data_rsp(conn
, tcp_conn
->in
.ctask
);
495 case ISCSI_OP_SCSI_CMD_RSP
:
496 tcp_conn
->in
.ctask
= session
->cmds
[itt
];
497 if (tcp_conn
->in
.datalen
)
500 spin_lock(&session
->lock
);
501 rc
= __iscsi_complete_pdu(conn
, hdr
, NULL
, 0);
502 spin_unlock(&session
->lock
);
505 tcp_conn
->in
.ctask
= session
->cmds
[itt
];
507 rc
= ISCSI_ERR_AHSLEN
;
508 else if (tcp_conn
->in
.ctask
->sc
->sc_data_direction
==
510 rc
= iscsi_r2t_rsp(conn
, tcp_conn
->in
.ctask
);
512 rc
= ISCSI_ERR_PROTO
;
514 case ISCSI_OP_LOGIN_RSP
:
515 case ISCSI_OP_TEXT_RSP
:
516 case ISCSI_OP_REJECT
:
517 case ISCSI_OP_ASYNC_EVENT
:
519 * It is possible that we could get a PDU with a buffer larger
520 * than 8K, but there are no targets that currently do this.
521 * For now we fail until we find a vendor that needs it
523 if (ISCSI_DEF_MAX_RECV_SEG_LEN
<
524 tcp_conn
->in
.datalen
) {
525 printk(KERN_ERR
"iscsi_tcp: received buffer of len %u "
526 "but conn buffer is only %u (opcode %0x)\n",
527 tcp_conn
->in
.datalen
,
528 ISCSI_DEF_MAX_RECV_SEG_LEN
, opcode
);
529 rc
= ISCSI_ERR_PROTO
;
533 if (tcp_conn
->in
.datalen
)
536 case ISCSI_OP_LOGOUT_RSP
:
537 case ISCSI_OP_NOOP_IN
:
538 case ISCSI_OP_SCSI_TMFUNC_RSP
:
539 rc
= iscsi_complete_pdu(conn
, hdr
, NULL
, 0);
542 rc
= ISCSI_ERR_BAD_OPCODE
;
550 * if we did zero copy for the header but we will need multiple
551 * skbs to complete the command then we have to copy the header
554 if (tcp_conn
->in
.zero_copy_hdr
&& tcp_conn
->in
.copy
<=
555 (tcp_conn
->in
.datalen
+ tcp_conn
->in
.padding
+
556 (conn
->datadgst_en
? 4 : 0))) {
557 debug_tcp("Copying header for later use. in.copy %d in.datalen"
558 " %d\n", tcp_conn
->in
.copy
, tcp_conn
->in
.datalen
);
559 memcpy(&tcp_conn
->hdr
, tcp_conn
->in
.hdr
,
560 sizeof(struct iscsi_hdr
));
561 tcp_conn
->in
.hdr
= &tcp_conn
->hdr
;
562 tcp_conn
->in
.zero_copy_hdr
= 0;
568 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
569 * @conn: iscsi tcp connection
570 * @ctask: scsi command task
571 * @buf: buffer to copy to
572 * @buf_size: size of buffer
573 * @offset: offset within the buffer
576 * The function calls skb_copy_bits() and updates per-connection and
577 * per-cmd byte counters.
579 * Read counters (in bytes):
581 * conn->in.offset offset within in progress SKB
582 * conn->in.copy left to copy from in progress SKB
584 * conn->in.copied copied already from in progress SKB
585 * conn->data_copied copied already from in progress buffer
586 * ctask->sent total bytes sent up to the MidLayer
587 * ctask->data_count left to copy from in progress Data-In
588 * buf_left left to copy from in progress buffer
591 iscsi_ctask_copy(struct iscsi_tcp_conn
*tcp_conn
, struct iscsi_cmd_task
*ctask
,
592 void *buf
, int buf_size
, int offset
)
594 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
595 int buf_left
= buf_size
- (tcp_conn
->data_copied
+ offset
);
596 unsigned size
= min(tcp_conn
->in
.copy
, buf_left
);
599 size
= min(size
, ctask
->data_count
);
601 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
602 size
, tcp_conn
->in
.offset
, tcp_conn
->in
.copied
);
605 BUG_ON(tcp_ctask
->sent
+ size
> scsi_bufflen(ctask
->sc
));
607 rc
= skb_copy_bits(tcp_conn
->in
.skb
, tcp_conn
->in
.offset
,
608 (char*)buf
+ (offset
+ tcp_conn
->data_copied
), size
);
609 /* must fit into skb->len */
612 tcp_conn
->in
.offset
+= size
;
613 tcp_conn
->in
.copy
-= size
;
614 tcp_conn
->in
.copied
+= size
;
615 tcp_conn
->data_copied
+= size
;
616 tcp_ctask
->sent
+= size
;
617 ctask
->data_count
-= size
;
619 BUG_ON(tcp_conn
->in
.copy
< 0);
620 BUG_ON(ctask
->data_count
< 0);
622 if (buf_size
!= (tcp_conn
->data_copied
+ offset
)) {
623 if (!ctask
->data_count
) {
624 BUG_ON(buf_size
- tcp_conn
->data_copied
< 0);
625 /* done with this PDU */
626 return buf_size
- tcp_conn
->data_copied
;
631 /* done with this buffer or with both - PDU and buffer */
632 tcp_conn
->data_copied
= 0;
637 * iscsi_tcp_copy - copy skb bits to the destanation buffer
638 * @conn: iscsi tcp connection
641 * The function calls skb_copy_bits() and updates per-connection
645 iscsi_tcp_copy(struct iscsi_conn
*conn
, int buf_size
)
647 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
648 int buf_left
= buf_size
- tcp_conn
->data_copied
;
649 int size
= min(tcp_conn
->in
.copy
, buf_left
);
652 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
653 size
, tcp_conn
->in
.offset
, tcp_conn
->data_copied
);
656 rc
= skb_copy_bits(tcp_conn
->in
.skb
, tcp_conn
->in
.offset
,
657 (char*)conn
->data
+ tcp_conn
->data_copied
, size
);
660 tcp_conn
->in
.offset
+= size
;
661 tcp_conn
->in
.copy
-= size
;
662 tcp_conn
->in
.copied
+= size
;
663 tcp_conn
->data_copied
+= size
;
665 if (buf_size
!= tcp_conn
->data_copied
)
672 partial_sg_digest_update(struct hash_desc
*desc
, struct scatterlist
*sg
,
673 int offset
, int length
)
675 struct scatterlist temp
;
677 memcpy(&temp
, sg
, sizeof(struct scatterlist
));
678 temp
.offset
= offset
;
679 temp
.length
= length
;
680 crypto_hash_update(desc
, &temp
, length
);
684 iscsi_recv_digest_update(struct iscsi_tcp_conn
*tcp_conn
, char* buf
, int len
)
686 struct scatterlist tmp
;
688 sg_init_one(&tmp
, buf
, len
);
689 crypto_hash_update(&tcp_conn
->rx_hash
, &tmp
, len
);
692 static int iscsi_scsi_data_in(struct iscsi_conn
*conn
)
694 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
695 struct iscsi_cmd_task
*ctask
= tcp_conn
->in
.ctask
;
696 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
697 struct scsi_cmnd
*sc
= ctask
->sc
;
698 struct scatterlist
*sg
;
699 int i
, offset
, rc
= 0;
701 BUG_ON((void*)ctask
!= sc
->SCp
.ptr
);
703 offset
= tcp_ctask
->data_offset
;
704 sg
= scsi_sglist(sc
);
706 if (tcp_ctask
->data_offset
)
707 for (i
= 0; i
< tcp_ctask
->sg_count
; i
++)
708 offset
-= sg
[i
].length
;
709 /* we've passed through partial sg*/
713 for (i
= tcp_ctask
->sg_count
; i
< scsi_sg_count(sc
); i
++) {
716 dest
= kmap_atomic(sg_page(&sg
[i
]), KM_SOFTIRQ0
);
717 rc
= iscsi_ctask_copy(tcp_conn
, ctask
, dest
+ sg
[i
].offset
,
718 sg
[i
].length
, offset
);
719 kunmap_atomic(dest
, KM_SOFTIRQ0
);
721 /* continue with the next SKB/PDU */
724 if (conn
->datadgst_en
) {
728 &sg
[i
], sg
[i
].length
);
730 partial_sg_digest_update(
733 sg
[i
].offset
+ offset
,
734 sg
[i
].length
- offset
);
737 tcp_ctask
->sg_count
++;
740 if (!ctask
->data_count
) {
741 if (rc
&& conn
->datadgst_en
)
743 * data-in is complete, but buffer not...
745 partial_sg_digest_update(&tcp_conn
->rx_hash
,
753 if (!tcp_conn
->in
.copy
)
756 BUG_ON(ctask
->data_count
);
758 /* check for non-exceptional status */
759 if (tcp_conn
->in
.hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
760 debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
761 (long)sc
, sc
->result
, ctask
->itt
,
762 tcp_conn
->in
.hdr
->flags
);
763 spin_lock(&conn
->session
->lock
);
764 __iscsi_complete_pdu(conn
, tcp_conn
->in
.hdr
, NULL
, 0);
765 spin_unlock(&conn
->session
->lock
);
772 iscsi_data_recv(struct iscsi_conn
*conn
)
774 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
777 opcode
= tcp_conn
->in
.hdr
->opcode
& ISCSI_OPCODE_MASK
;
779 case ISCSI_OP_SCSI_DATA_IN
:
780 rc
= iscsi_scsi_data_in(conn
);
782 case ISCSI_OP_SCSI_CMD_RSP
:
783 case ISCSI_OP_TEXT_RSP
:
784 case ISCSI_OP_LOGIN_RSP
:
785 case ISCSI_OP_ASYNC_EVENT
:
786 case ISCSI_OP_REJECT
:
788 * Collect data segment to the connection's data
791 if (iscsi_tcp_copy(conn
, tcp_conn
->in
.datalen
)) {
796 rc
= iscsi_complete_pdu(conn
, tcp_conn
->in
.hdr
, conn
->data
,
797 tcp_conn
->in
.datalen
);
798 if (!rc
&& conn
->datadgst_en
&& opcode
!= ISCSI_OP_LOGIN_RSP
)
799 iscsi_recv_digest_update(tcp_conn
, conn
->data
,
800 tcp_conn
->in
.datalen
);
810 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
811 * @rd_desc: read descriptor
812 * @skb: socket buffer
813 * @offset: offset in skb
814 * @len: skb->len - offset
817 iscsi_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
,
818 unsigned int offset
, size_t len
)
821 struct iscsi_conn
*conn
= rd_desc
->arg
.data
;
822 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
824 char pad
[ISCSI_PAD_LEN
];
825 struct scatterlist sg
;
828 * Save current SKB and its offset in the corresponding
829 * connection context.
831 tcp_conn
->in
.copy
= skb
->len
- offset
;
832 tcp_conn
->in
.offset
= offset
;
833 tcp_conn
->in
.skb
= skb
;
834 tcp_conn
->in
.len
= tcp_conn
->in
.copy
;
835 BUG_ON(tcp_conn
->in
.copy
<= 0);
836 debug_tcp("in %d bytes\n", tcp_conn
->in
.copy
);
839 tcp_conn
->in
.copied
= 0;
842 if (unlikely(conn
->suspend_rx
)) {
843 debug_tcp("conn %d Rx suspended!\n", conn
->id
);
847 if (tcp_conn
->in_progress
== IN_PROGRESS_WAIT_HEADER
||
848 tcp_conn
->in_progress
== IN_PROGRESS_HEADER_GATHER
) {
849 rc
= iscsi_hdr_extract(tcp_conn
);
854 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
860 * Verify and process incoming PDU header.
862 rc
= iscsi_tcp_hdr_recv(conn
);
863 if (!rc
&& tcp_conn
->in
.datalen
) {
864 if (conn
->datadgst_en
)
865 crypto_hash_init(&tcp_conn
->rx_hash
);
866 tcp_conn
->in_progress
= IN_PROGRESS_DATA_RECV
;
868 iscsi_conn_failure(conn
, rc
);
873 if (tcp_conn
->in_progress
== IN_PROGRESS_DDIGEST_RECV
&&
875 uint32_t recv_digest
;
877 debug_tcp("extra data_recv offset %d copy %d\n",
878 tcp_conn
->in
.offset
, tcp_conn
->in
.copy
);
880 if (!tcp_conn
->data_copied
) {
881 if (tcp_conn
->in
.padding
) {
882 debug_tcp("padding -> %d\n",
883 tcp_conn
->in
.padding
);
884 memset(pad
, 0, tcp_conn
->in
.padding
);
885 sg_init_one(&sg
, pad
, tcp_conn
->in
.padding
);
886 crypto_hash_update(&tcp_conn
->rx_hash
,
889 crypto_hash_final(&tcp_conn
->rx_hash
,
890 (u8
*) &tcp_conn
->in
.datadgst
);
891 debug_tcp("rx digest 0x%x\n", tcp_conn
->in
.datadgst
);
894 rc
= iscsi_tcp_copy(conn
, sizeof(uint32_t));
898 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
902 memcpy(&recv_digest
, conn
->data
, sizeof(uint32_t));
903 if (recv_digest
!= tcp_conn
->in
.datadgst
) {
904 debug_tcp("iscsi_tcp: data digest error!"
905 "0x%x != 0x%x\n", recv_digest
,
906 tcp_conn
->in
.datadgst
);
907 iscsi_conn_failure(conn
, ISCSI_ERR_DATA_DGST
);
910 debug_tcp("iscsi_tcp: data digest match!"
911 "0x%x == 0x%x\n", recv_digest
,
912 tcp_conn
->in
.datadgst
);
913 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
917 if (tcp_conn
->in_progress
== IN_PROGRESS_DATA_RECV
&&
919 debug_tcp("data_recv offset %d copy %d\n",
920 tcp_conn
->in
.offset
, tcp_conn
->in
.copy
);
922 rc
= iscsi_data_recv(conn
);
926 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
930 if (tcp_conn
->in
.padding
)
931 tcp_conn
->in_progress
= IN_PROGRESS_PAD_RECV
;
932 else if (conn
->datadgst_en
)
933 tcp_conn
->in_progress
= IN_PROGRESS_DDIGEST_RECV
;
935 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
936 tcp_conn
->data_copied
= 0;
939 if (tcp_conn
->in_progress
== IN_PROGRESS_PAD_RECV
&&
941 int copylen
= min(tcp_conn
->in
.padding
- tcp_conn
->data_copied
,
944 tcp_conn
->in
.copy
-= copylen
;
945 tcp_conn
->in
.offset
+= copylen
;
946 tcp_conn
->data_copied
+= copylen
;
948 if (tcp_conn
->data_copied
!= tcp_conn
->in
.padding
)
949 tcp_conn
->in_progress
= IN_PROGRESS_PAD_RECV
;
950 else if (conn
->datadgst_en
)
951 tcp_conn
->in_progress
= IN_PROGRESS_DDIGEST_RECV
;
953 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
954 tcp_conn
->data_copied
= 0;
957 debug_tcp("f, processed %d from out of %d padding %d\n",
958 tcp_conn
->in
.offset
- offset
, (int)len
, tcp_conn
->in
.padding
);
959 BUG_ON(tcp_conn
->in
.offset
- offset
> len
);
961 if (tcp_conn
->in
.offset
- offset
!= len
) {
962 debug_tcp("continue to process %d bytes\n",
963 (int)len
- (tcp_conn
->in
.offset
- offset
));
968 processed
= tcp_conn
->in
.offset
- offset
;
969 BUG_ON(processed
== 0);
973 processed
= tcp_conn
->in
.offset
- offset
;
974 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
975 processed
, (int)len
, (int)rd_desc
->count
);
976 BUG_ON(processed
== 0);
977 BUG_ON(processed
> len
);
979 conn
->rxdata_octets
+= processed
;
984 iscsi_tcp_data_ready(struct sock
*sk
, int flag
)
986 struct iscsi_conn
*conn
= sk
->sk_user_data
;
987 read_descriptor_t rd_desc
;
989 read_lock(&sk
->sk_callback_lock
);
992 * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
993 * We set count to 1 because we want the network layer to
994 * hand us all the skbs that are available. iscsi_tcp_data_recv
995 * handled pdus that cross buffers or pdus that still need data.
997 rd_desc
.arg
.data
= conn
;
999 tcp_read_sock(sk
, &rd_desc
, iscsi_tcp_data_recv
);
1001 read_unlock(&sk
->sk_callback_lock
);
1005 iscsi_tcp_state_change(struct sock
*sk
)
1007 struct iscsi_tcp_conn
*tcp_conn
;
1008 struct iscsi_conn
*conn
;
1009 struct iscsi_session
*session
;
1010 void (*old_state_change
)(struct sock
*);
1012 read_lock(&sk
->sk_callback_lock
);
1014 conn
= (struct iscsi_conn
*)sk
->sk_user_data
;
1015 session
= conn
->session
;
1017 if ((sk
->sk_state
== TCP_CLOSE_WAIT
||
1018 sk
->sk_state
== TCP_CLOSE
) &&
1019 !atomic_read(&sk
->sk_rmem_alloc
)) {
1020 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1021 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1024 tcp_conn
= conn
->dd_data
;
1025 old_state_change
= tcp_conn
->old_state_change
;
1027 read_unlock(&sk
->sk_callback_lock
);
1029 old_state_change(sk
);
1033 * iscsi_write_space - Called when more output buffer space is available
1034 * @sk: socket space is available for
1037 iscsi_write_space(struct sock
*sk
)
1039 struct iscsi_conn
*conn
= (struct iscsi_conn
*)sk
->sk_user_data
;
1040 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1042 tcp_conn
->old_write_space(sk
);
1043 debug_tcp("iscsi_write_space: cid %d\n", conn
->id
);
1044 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
1048 iscsi_conn_set_callbacks(struct iscsi_conn
*conn
)
1050 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1051 struct sock
*sk
= tcp_conn
->sock
->sk
;
1053 /* assign new callbacks */
1054 write_lock_bh(&sk
->sk_callback_lock
);
1055 sk
->sk_user_data
= conn
;
1056 tcp_conn
->old_data_ready
= sk
->sk_data_ready
;
1057 tcp_conn
->old_state_change
= sk
->sk_state_change
;
1058 tcp_conn
->old_write_space
= sk
->sk_write_space
;
1059 sk
->sk_data_ready
= iscsi_tcp_data_ready
;
1060 sk
->sk_state_change
= iscsi_tcp_state_change
;
1061 sk
->sk_write_space
= iscsi_write_space
;
1062 write_unlock_bh(&sk
->sk_callback_lock
);
1066 iscsi_conn_restore_callbacks(struct iscsi_tcp_conn
*tcp_conn
)
1068 struct sock
*sk
= tcp_conn
->sock
->sk
;
1070 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1071 write_lock_bh(&sk
->sk_callback_lock
);
1072 sk
->sk_user_data
= NULL
;
1073 sk
->sk_data_ready
= tcp_conn
->old_data_ready
;
1074 sk
->sk_state_change
= tcp_conn
->old_state_change
;
1075 sk
->sk_write_space
= tcp_conn
->old_write_space
;
1076 sk
->sk_no_check
= 0;
1077 write_unlock_bh(&sk
->sk_callback_lock
);
1081 * iscsi_send - generic send routine
1082 * @sk: kernel's socket
1083 * @buf: buffer to write from
1084 * @size: actual size to write
1085 * @flags: socket's flags
1088 iscsi_send(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
, int size
, int flags
)
1090 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1091 struct socket
*sk
= tcp_conn
->sock
;
1092 int offset
= buf
->sg
.offset
+ buf
->sent
, res
;
1095 * if we got use_sg=0 or are sending something we kmallocd
1096 * then we did not have to do kmap (kmap returns page_address)
1098 * if we got use_sg > 0, but had to drop down, we do not
1099 * set clustering so this should only happen for that
1102 if (buf
->use_sendmsg
)
1103 res
= sock_no_sendpage(sk
, sg_page(&buf
->sg
), offset
, size
, flags
);
1105 res
= tcp_conn
->sendpage(sk
, sg_page(&buf
->sg
), offset
, size
, flags
);
1108 conn
->txdata_octets
+= res
;
1113 tcp_conn
->sendpage_failures_cnt
++;
1117 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1122 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1123 * @conn: iscsi connection
1124 * @buf: buffer to write from
1125 * @datalen: lenght of data to be sent after the header
1131 iscsi_sendhdr(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
, int datalen
)
1133 int flags
= 0; /* MSG_DONTWAIT; */
1136 size
= buf
->sg
.length
- buf
->sent
;
1137 BUG_ON(buf
->sent
+ size
> buf
->sg
.length
);
1138 if (buf
->sent
+ size
!= buf
->sg
.length
|| datalen
)
1141 res
= iscsi_send(conn
, buf
, size
, flags
);
1142 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size
, buf
->sent
, res
);
1153 * iscsi_sendpage - send one page of iSCSI Data-Out.
1154 * @conn: iscsi connection
1155 * @buf: buffer to write from
1156 * @count: remaining data
1157 * @sent: number of bytes sent
1163 iscsi_sendpage(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
,
1164 int *count
, int *sent
)
1166 int flags
= 0; /* MSG_DONTWAIT; */
1169 size
= buf
->sg
.length
- buf
->sent
;
1170 BUG_ON(buf
->sent
+ size
> buf
->sg
.length
);
1173 if (buf
->sent
+ size
!= buf
->sg
.length
|| *count
!= size
)
1176 res
= iscsi_send(conn
, buf
, size
, flags
);
1177 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1178 size
, buf
->sent
, *count
, *sent
, res
);
1191 iscsi_data_digest_init(struct iscsi_tcp_conn
*tcp_conn
,
1192 struct iscsi_tcp_cmd_task
*tcp_ctask
)
1194 crypto_hash_init(&tcp_conn
->tx_hash
);
1195 tcp_ctask
->digest_count
= 4;
1199 * iscsi_solicit_data_cont - initialize next Data-Out
1200 * @conn: iscsi connection
1201 * @ctask: scsi command task
1203 * @left: bytes left to transfer
1206 * Initialize next Data-Out within this R2T sequence and continue
1207 * to process next Scatter-Gather element(if any) of this SCSI command.
1209 * Called under connection lock.
1212 iscsi_solicit_data_cont(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1213 struct iscsi_r2t_info
*r2t
, int left
)
1215 struct iscsi_data
*hdr
;
1218 hdr
= &r2t
->dtask
.hdr
;
1219 memset(hdr
, 0, sizeof(struct iscsi_data
));
1220 hdr
->ttt
= r2t
->ttt
;
1221 hdr
->datasn
= cpu_to_be32(r2t
->solicit_datasn
);
1222 r2t
->solicit_datasn
++;
1223 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
1224 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
1225 hdr
->itt
= ctask
->hdr
->itt
;
1226 hdr
->exp_statsn
= r2t
->exp_statsn
;
1227 new_offset
= r2t
->data_offset
+ r2t
->sent
;
1228 hdr
->offset
= cpu_to_be32(new_offset
);
1229 if (left
> conn
->max_xmit_dlength
) {
1230 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
1231 r2t
->data_count
= conn
->max_xmit_dlength
;
1233 hton24(hdr
->dlength
, left
);
1234 r2t
->data_count
= left
;
1235 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
1237 conn
->dataout_pdus_cnt
++;
1239 iscsi_buf_init_iov(&r2t
->headbuf
, (char*)hdr
,
1240 sizeof(struct iscsi_hdr
));
1242 if (iscsi_buf_left(&r2t
->sendbuf
))
1245 iscsi_buf_init_sg(&r2t
->sendbuf
, r2t
->sg
);
1249 static void iscsi_set_padding(struct iscsi_tcp_cmd_task
*tcp_ctask
,
1252 tcp_ctask
->pad_count
= len
& (ISCSI_PAD_LEN
- 1);
1253 if (!tcp_ctask
->pad_count
)
1256 tcp_ctask
->pad_count
= ISCSI_PAD_LEN
- tcp_ctask
->pad_count
;
1257 debug_scsi("write padding %d bytes\n", tcp_ctask
->pad_count
);
1258 tcp_ctask
->xmstate
|= XMSTATE_W_PAD
;
1262 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1263 * @conn: iscsi connection
1264 * @ctask: scsi command task
1268 iscsi_tcp_cmd_init(struct iscsi_cmd_task
*ctask
)
1270 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1272 BUG_ON(__kfifo_len(tcp_ctask
->r2tqueue
));
1273 tcp_ctask
->xmstate
= XMSTATE_CMD_HDR_INIT
;
1277 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
1278 * @conn: iscsi connection
1279 * @mtask: task management task
1282 * The function can return -EAGAIN in which case caller must
1283 * call it again later, or recover. '0' return code means successful
1286 * Management xmit state machine consists of these states:
1287 * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header
1288 * XMSTATE_IMM_HDR - PDU Header xmit in progress
1289 * XMSTATE_IMM_DATA - PDU Data xmit in progress
1290 * XMSTATE_IDLE - management PDU is done
1293 iscsi_tcp_mtask_xmit(struct iscsi_conn
*conn
, struct iscsi_mgmt_task
*mtask
)
1295 struct iscsi_tcp_mgmt_task
*tcp_mtask
= mtask
->dd_data
;
1298 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1299 conn
->id
, tcp_mtask
->xmstate
, mtask
->itt
);
1301 if (tcp_mtask
->xmstate
& XMSTATE_IMM_HDR_INIT
) {
1302 iscsi_buf_init_iov(&tcp_mtask
->headbuf
, (char*)mtask
->hdr
,
1303 sizeof(struct iscsi_hdr
));
1305 if (mtask
->data_count
) {
1306 tcp_mtask
->xmstate
|= XMSTATE_IMM_DATA
;
1307 iscsi_buf_init_iov(&tcp_mtask
->sendbuf
,
1312 if (conn
->c_stage
!= ISCSI_CONN_INITIAL_STAGE
&&
1313 conn
->stop_stage
!= STOP_CONN_RECOVER
&&
1315 iscsi_hdr_digest(conn
, &tcp_mtask
->headbuf
,
1316 (u8
*)tcp_mtask
->hdrext
);
1318 tcp_mtask
->sent
= 0;
1319 tcp_mtask
->xmstate
&= ~XMSTATE_IMM_HDR_INIT
;
1320 tcp_mtask
->xmstate
|= XMSTATE_IMM_HDR
;
1323 if (tcp_mtask
->xmstate
& XMSTATE_IMM_HDR
) {
1324 rc
= iscsi_sendhdr(conn
, &tcp_mtask
->headbuf
,
1328 tcp_mtask
->xmstate
&= ~XMSTATE_IMM_HDR
;
1331 if (tcp_mtask
->xmstate
& XMSTATE_IMM_DATA
) {
1332 BUG_ON(!mtask
->data_count
);
1333 tcp_mtask
->xmstate
&= ~XMSTATE_IMM_DATA
;
1334 /* FIXME: implement.
1335 * Virtual buffer could be spreaded across multiple pages...
1340 rc
= iscsi_sendpage(conn
, &tcp_mtask
->sendbuf
,
1341 &mtask
->data_count
, &tcp_mtask
->sent
);
1343 tcp_mtask
->xmstate
|= XMSTATE_IMM_DATA
;
1346 } while (mtask
->data_count
);
1349 BUG_ON(tcp_mtask
->xmstate
!= XMSTATE_IDLE
);
1350 if (mtask
->hdr
->itt
== RESERVED_ITT
) {
1351 struct iscsi_session
*session
= conn
->session
;
1353 spin_lock_bh(&session
->lock
);
1354 list_del(&conn
->mtask
->running
);
1355 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->mtask
,
1357 spin_unlock_bh(&session
->lock
);
1363 iscsi_send_cmd_hdr(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1365 struct scsi_cmnd
*sc
= ctask
->sc
;
1366 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1369 if (tcp_ctask
->xmstate
& XMSTATE_CMD_HDR_INIT
) {
1370 tcp_ctask
->sent
= 0;
1371 tcp_ctask
->sg_count
= 0;
1372 tcp_ctask
->exp_datasn
= 0;
1374 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
1375 struct scatterlist
*sg
= scsi_sglist(sc
);
1377 iscsi_buf_init_sg(&tcp_ctask
->sendbuf
, sg
);
1378 tcp_ctask
->sg
= sg
+ 1;
1379 tcp_ctask
->bad_sg
= sg
+ scsi_sg_count(sc
);
1381 debug_scsi("cmd [itt 0x%x total %d imm_data %d "
1382 "unsol count %d, unsol offset %d]\n",
1383 ctask
->itt
, scsi_bufflen(sc
),
1384 ctask
->imm_count
, ctask
->unsol_count
,
1385 ctask
->unsol_offset
);
1388 iscsi_buf_init_iov(&tcp_ctask
->headbuf
, (char*)ctask
->hdr
,
1389 sizeof(struct iscsi_hdr
));
1391 if (conn
->hdrdgst_en
)
1392 iscsi_hdr_digest(conn
, &tcp_ctask
->headbuf
,
1393 (u8
*)tcp_ctask
->hdrext
);
1394 tcp_ctask
->xmstate
&= ~XMSTATE_CMD_HDR_INIT
;
1395 tcp_ctask
->xmstate
|= XMSTATE_CMD_HDR_XMIT
;
1398 if (tcp_ctask
->xmstate
& XMSTATE_CMD_HDR_XMIT
) {
1399 rc
= iscsi_sendhdr(conn
, &tcp_ctask
->headbuf
, ctask
->imm_count
);
1402 tcp_ctask
->xmstate
&= ~XMSTATE_CMD_HDR_XMIT
;
1404 if (sc
->sc_data_direction
!= DMA_TO_DEVICE
)
1407 if (ctask
->imm_count
) {
1408 tcp_ctask
->xmstate
|= XMSTATE_IMM_DATA
;
1409 iscsi_set_padding(tcp_ctask
, ctask
->imm_count
);
1411 if (ctask
->conn
->datadgst_en
) {
1412 iscsi_data_digest_init(ctask
->conn
->dd_data
,
1414 tcp_ctask
->immdigest
= 0;
1418 if (ctask
->unsol_count
)
1419 tcp_ctask
->xmstate
|=
1420 XMSTATE_UNS_HDR
| XMSTATE_UNS_INIT
;
1426 iscsi_send_padding(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1428 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1429 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1432 if (tcp_ctask
->xmstate
& XMSTATE_W_PAD
) {
1433 iscsi_buf_init_iov(&tcp_ctask
->sendbuf
, (char*)&tcp_ctask
->pad
,
1434 tcp_ctask
->pad_count
);
1435 if (conn
->datadgst_en
)
1436 crypto_hash_update(&tcp_conn
->tx_hash
,
1437 &tcp_ctask
->sendbuf
.sg
,
1438 tcp_ctask
->sendbuf
.sg
.length
);
1439 } else if (!(tcp_ctask
->xmstate
& XMSTATE_W_RESEND_PAD
))
1442 tcp_ctask
->xmstate
&= ~XMSTATE_W_PAD
;
1443 tcp_ctask
->xmstate
&= ~XMSTATE_W_RESEND_PAD
;
1444 debug_scsi("sending %d pad bytes for itt 0x%x\n",
1445 tcp_ctask
->pad_count
, ctask
->itt
);
1446 rc
= iscsi_sendpage(conn
, &tcp_ctask
->sendbuf
, &tcp_ctask
->pad_count
,
1449 debug_scsi("padding send failed %d\n", rc
);
1450 tcp_ctask
->xmstate
|= XMSTATE_W_RESEND_PAD
;
1456 iscsi_send_digest(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1457 struct iscsi_buf
*buf
, uint32_t *digest
)
1459 struct iscsi_tcp_cmd_task
*tcp_ctask
;
1460 struct iscsi_tcp_conn
*tcp_conn
;
1463 if (!conn
->datadgst_en
)
1466 tcp_ctask
= ctask
->dd_data
;
1467 tcp_conn
= conn
->dd_data
;
1469 if (!(tcp_ctask
->xmstate
& XMSTATE_W_RESEND_DATA_DIGEST
)) {
1470 crypto_hash_final(&tcp_conn
->tx_hash
, (u8
*)digest
);
1471 iscsi_buf_init_iov(buf
, (char*)digest
, 4);
1473 tcp_ctask
->xmstate
&= ~XMSTATE_W_RESEND_DATA_DIGEST
;
1475 rc
= iscsi_sendpage(conn
, buf
, &tcp_ctask
->digest_count
, &sent
);
1477 debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest
,
1480 debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
1481 *digest
, ctask
->itt
);
1482 tcp_ctask
->xmstate
|= XMSTATE_W_RESEND_DATA_DIGEST
;
1488 iscsi_send_data(struct iscsi_cmd_task
*ctask
, struct iscsi_buf
*sendbuf
,
1489 struct scatterlist
**sg
, int *sent
, int *count
,
1490 struct iscsi_buf
*digestbuf
, uint32_t *digest
)
1492 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1493 struct iscsi_conn
*conn
= ctask
->conn
;
1494 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1495 int rc
, buf_sent
, offset
;
1499 offset
= sendbuf
->sent
;
1501 rc
= iscsi_sendpage(conn
, sendbuf
, count
, &buf_sent
);
1502 *sent
= *sent
+ buf_sent
;
1503 if (buf_sent
&& conn
->datadgst_en
)
1504 partial_sg_digest_update(&tcp_conn
->tx_hash
,
1505 &sendbuf
->sg
, sendbuf
->sg
.offset
+ offset
,
1507 if (!iscsi_buf_left(sendbuf
) && *sg
!= tcp_ctask
->bad_sg
) {
1508 iscsi_buf_init_sg(sendbuf
, *sg
);
1516 rc
= iscsi_send_padding(conn
, ctask
);
1520 return iscsi_send_digest(conn
, ctask
, digestbuf
, digest
);
1524 iscsi_send_unsol_hdr(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1526 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1527 struct iscsi_data_task
*dtask
;
1530 tcp_ctask
->xmstate
|= XMSTATE_UNS_DATA
;
1531 if (tcp_ctask
->xmstate
& XMSTATE_UNS_INIT
) {
1532 dtask
= &tcp_ctask
->unsol_dtask
;
1534 iscsi_prep_unsolicit_data_pdu(ctask
, &dtask
->hdr
);
1535 iscsi_buf_init_iov(&tcp_ctask
->headbuf
, (char*)&dtask
->hdr
,
1536 sizeof(struct iscsi_hdr
));
1537 if (conn
->hdrdgst_en
)
1538 iscsi_hdr_digest(conn
, &tcp_ctask
->headbuf
,
1539 (u8
*)dtask
->hdrext
);
1541 tcp_ctask
->xmstate
&= ~XMSTATE_UNS_INIT
;
1542 iscsi_set_padding(tcp_ctask
, ctask
->data_count
);
1545 rc
= iscsi_sendhdr(conn
, &tcp_ctask
->headbuf
, ctask
->data_count
);
1547 tcp_ctask
->xmstate
&= ~XMSTATE_UNS_DATA
;
1548 tcp_ctask
->xmstate
|= XMSTATE_UNS_HDR
;
1552 if (conn
->datadgst_en
) {
1553 dtask
= &tcp_ctask
->unsol_dtask
;
1554 iscsi_data_digest_init(ctask
->conn
->dd_data
, tcp_ctask
);
1558 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1559 ctask
->itt
, ctask
->unsol_count
, tcp_ctask
->sent
);
1564 iscsi_send_unsol_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1566 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1569 if (tcp_ctask
->xmstate
& XMSTATE_UNS_HDR
) {
1570 BUG_ON(!ctask
->unsol_count
);
1571 tcp_ctask
->xmstate
&= ~XMSTATE_UNS_HDR
;
1573 rc
= iscsi_send_unsol_hdr(conn
, ctask
);
1578 if (tcp_ctask
->xmstate
& XMSTATE_UNS_DATA
) {
1579 struct iscsi_data_task
*dtask
= &tcp_ctask
->unsol_dtask
;
1580 int start
= tcp_ctask
->sent
;
1582 rc
= iscsi_send_data(ctask
, &tcp_ctask
->sendbuf
, &tcp_ctask
->sg
,
1583 &tcp_ctask
->sent
, &ctask
->data_count
,
1584 &dtask
->digestbuf
, &dtask
->digest
);
1585 ctask
->unsol_count
-= tcp_ctask
->sent
- start
;
1588 tcp_ctask
->xmstate
&= ~XMSTATE_UNS_DATA
;
1590 * Done with the Data-Out. Next, check if we need
1591 * to send another unsolicited Data-Out.
1593 if (ctask
->unsol_count
) {
1594 debug_scsi("sending more uns\n");
1595 tcp_ctask
->xmstate
|= XMSTATE_UNS_INIT
;
1602 static int iscsi_send_sol_pdu(struct iscsi_conn
*conn
,
1603 struct iscsi_cmd_task
*ctask
)
1605 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1606 struct iscsi_session
*session
= conn
->session
;
1607 struct iscsi_r2t_info
*r2t
;
1608 struct iscsi_data_task
*dtask
;
1611 if (tcp_ctask
->xmstate
& XMSTATE_SOL_HDR_INIT
) {
1612 if (!tcp_ctask
->r2t
) {
1613 spin_lock_bh(&session
->lock
);
1614 __kfifo_get(tcp_ctask
->r2tqueue
, (void*)&tcp_ctask
->r2t
,
1616 spin_unlock_bh(&session
->lock
);
1619 r2t
= tcp_ctask
->r2t
;
1620 dtask
= &r2t
->dtask
;
1622 if (conn
->hdrdgst_en
)
1623 iscsi_hdr_digest(conn
, &r2t
->headbuf
,
1624 (u8
*)dtask
->hdrext
);
1625 tcp_ctask
->xmstate
&= ~XMSTATE_SOL_HDR_INIT
;
1626 tcp_ctask
->xmstate
|= XMSTATE_SOL_HDR
;
1629 if (tcp_ctask
->xmstate
& XMSTATE_SOL_HDR
) {
1630 r2t
= tcp_ctask
->r2t
;
1631 dtask
= &r2t
->dtask
;
1633 rc
= iscsi_sendhdr(conn
, &r2t
->headbuf
, r2t
->data_count
);
1636 tcp_ctask
->xmstate
&= ~XMSTATE_SOL_HDR
;
1637 tcp_ctask
->xmstate
|= XMSTATE_SOL_DATA
;
1639 if (conn
->datadgst_en
) {
1640 iscsi_data_digest_init(conn
->dd_data
, tcp_ctask
);
1644 iscsi_set_padding(tcp_ctask
, r2t
->data_count
);
1645 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1646 r2t
->solicit_datasn
- 1, ctask
->itt
, r2t
->data_count
,
1650 if (tcp_ctask
->xmstate
& XMSTATE_SOL_DATA
) {
1651 r2t
= tcp_ctask
->r2t
;
1652 dtask
= &r2t
->dtask
;
1654 rc
= iscsi_send_data(ctask
, &r2t
->sendbuf
, &r2t
->sg
,
1655 &r2t
->sent
, &r2t
->data_count
,
1656 &dtask
->digestbuf
, &dtask
->digest
);
1659 tcp_ctask
->xmstate
&= ~XMSTATE_SOL_DATA
;
1662 * Done with this Data-Out. Next, check if we have
1663 * to send another Data-Out for this R2T.
1665 BUG_ON(r2t
->data_length
- r2t
->sent
< 0);
1666 left
= r2t
->data_length
- r2t
->sent
;
1668 iscsi_solicit_data_cont(conn
, ctask
, r2t
, left
);
1673 * Done with this R2T. Check if there are more
1674 * outstanding R2Ts ready to be processed.
1676 spin_lock_bh(&session
->lock
);
1677 tcp_ctask
->r2t
= NULL
;
1678 __kfifo_put(tcp_ctask
->r2tpool
.queue
, (void*)&r2t
,
1680 if (__kfifo_get(tcp_ctask
->r2tqueue
, (void*)&r2t
,
1682 tcp_ctask
->r2t
= r2t
;
1683 spin_unlock_bh(&session
->lock
);
1686 spin_unlock_bh(&session
->lock
);
1692 * iscsi_tcp_ctask_xmit - xmit normal PDU task
1693 * @conn: iscsi connection
1694 * @ctask: iscsi command task
1697 * The function can return -EAGAIN in which case caller must
1698 * call it again later, or recover. '0' return code means successful
1700 * The function is devided to logical helpers (above) for the different
1703 *iscsi_send_cmd_hdr()
1704 * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate
1706 * XMSTATE_CMD_HDR_XMIT - Transmit header in progress
1709 * XMSTATE_W_PAD - Prepare and send pading
1710 * XMSTATE_W_RESEND_PAD - retry send pading
1713 * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest
1714 * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest
1716 *iscsi_send_unsol_hdr
1717 * XMSTATE_UNS_INIT - prepare un-solicit data header and digest
1718 * XMSTATE_UNS_HDR - send un-solicit header
1720 *iscsi_send_unsol_pdu
1721 * XMSTATE_UNS_DATA - send un-solicit data in progress
1724 * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize
1725 * XMSTATE_SOL_HDR - send solicit header
1726 * XMSTATE_SOL_DATA - send solicit data
1728 *iscsi_tcp_ctask_xmit
1729 * XMSTATE_IMM_DATA - xmit managment data (??)
1732 iscsi_tcp_ctask_xmit(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1734 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1737 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
1738 conn
->id
, tcp_ctask
->xmstate
, ctask
->itt
);
1740 rc
= iscsi_send_cmd_hdr(conn
, ctask
);
1743 if (ctask
->sc
->sc_data_direction
!= DMA_TO_DEVICE
)
1746 if (tcp_ctask
->xmstate
& XMSTATE_IMM_DATA
) {
1747 rc
= iscsi_send_data(ctask
, &tcp_ctask
->sendbuf
, &tcp_ctask
->sg
,
1748 &tcp_ctask
->sent
, &ctask
->imm_count
,
1749 &tcp_ctask
->immbuf
, &tcp_ctask
->immdigest
);
1752 tcp_ctask
->xmstate
&= ~XMSTATE_IMM_DATA
;
1755 rc
= iscsi_send_unsol_pdu(conn
, ctask
);
1759 rc
= iscsi_send_sol_pdu(conn
, ctask
);
1766 static struct iscsi_cls_conn
*
1767 iscsi_tcp_conn_create(struct iscsi_cls_session
*cls_session
, uint32_t conn_idx
)
1769 struct iscsi_conn
*conn
;
1770 struct iscsi_cls_conn
*cls_conn
;
1771 struct iscsi_tcp_conn
*tcp_conn
;
1773 cls_conn
= iscsi_conn_setup(cls_session
, conn_idx
);
1776 conn
= cls_conn
->dd_data
;
1778 * due to strange issues with iser these are not set
1779 * in iscsi_conn_setup
1781 conn
->max_recv_dlength
= ISCSI_DEF_MAX_RECV_SEG_LEN
;
1783 tcp_conn
= kzalloc(sizeof(*tcp_conn
), GFP_KERNEL
);
1785 goto tcp_conn_alloc_fail
;
1787 conn
->dd_data
= tcp_conn
;
1788 tcp_conn
->iscsi_conn
= conn
;
1789 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
1790 /* initial operational parameters */
1791 tcp_conn
->hdr_size
= sizeof(struct iscsi_hdr
);
1793 tcp_conn
->tx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
1795 tcp_conn
->tx_hash
.flags
= 0;
1796 if (IS_ERR(tcp_conn
->tx_hash
.tfm
)) {
1797 printk(KERN_ERR
"Could not create connection due to crc32c "
1798 "loading error %ld. Make sure the crc32c module is "
1799 "built as a module or into the kernel\n",
1800 PTR_ERR(tcp_conn
->tx_hash
.tfm
));
1804 tcp_conn
->rx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
1806 tcp_conn
->rx_hash
.flags
= 0;
1807 if (IS_ERR(tcp_conn
->rx_hash
.tfm
)) {
1808 printk(KERN_ERR
"Could not create connection due to crc32c "
1809 "loading error %ld. Make sure the crc32c module is "
1810 "built as a module or into the kernel\n",
1811 PTR_ERR(tcp_conn
->rx_hash
.tfm
));
1818 crypto_free_hash(tcp_conn
->tx_hash
.tfm
);
1821 tcp_conn_alloc_fail
:
1822 iscsi_conn_teardown(cls_conn
);
1827 iscsi_tcp_release_conn(struct iscsi_conn
*conn
)
1829 struct iscsi_session
*session
= conn
->session
;
1830 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1831 struct socket
*sock
= tcp_conn
->sock
;
1836 sock_hold(sock
->sk
);
1837 iscsi_conn_restore_callbacks(tcp_conn
);
1840 spin_lock_bh(&session
->lock
);
1841 tcp_conn
->sock
= NULL
;
1842 conn
->recv_lock
= NULL
;
1843 spin_unlock_bh(&session
->lock
);
1848 iscsi_tcp_conn_destroy(struct iscsi_cls_conn
*cls_conn
)
1850 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1851 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1853 iscsi_tcp_release_conn(conn
);
1854 iscsi_conn_teardown(cls_conn
);
1856 if (tcp_conn
->tx_hash
.tfm
)
1857 crypto_free_hash(tcp_conn
->tx_hash
.tfm
);
1858 if (tcp_conn
->rx_hash
.tfm
)
1859 crypto_free_hash(tcp_conn
->rx_hash
.tfm
);
1865 iscsi_tcp_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
1867 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1868 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1870 iscsi_conn_stop(cls_conn
, flag
);
1871 iscsi_tcp_release_conn(conn
);
1872 tcp_conn
->hdr_size
= sizeof(struct iscsi_hdr
);
1875 static int iscsi_tcp_get_addr(struct iscsi_conn
*conn
, struct socket
*sock
,
1876 char *buf
, int *port
,
1877 int (*getname
)(struct socket
*, struct sockaddr
*,
1880 struct sockaddr_storage
*addr
;
1881 struct sockaddr_in6
*sin6
;
1882 struct sockaddr_in
*sin
;
1885 addr
= kmalloc(sizeof(*addr
), GFP_KERNEL
);
1889 if (getname(sock
, (struct sockaddr
*) addr
, &len
)) {
1894 switch (addr
->ss_family
) {
1896 sin
= (struct sockaddr_in
*)addr
;
1897 spin_lock_bh(&conn
->session
->lock
);
1898 sprintf(buf
, NIPQUAD_FMT
, NIPQUAD(sin
->sin_addr
.s_addr
));
1899 *port
= be16_to_cpu(sin
->sin_port
);
1900 spin_unlock_bh(&conn
->session
->lock
);
1903 sin6
= (struct sockaddr_in6
*)addr
;
1904 spin_lock_bh(&conn
->session
->lock
);
1905 sprintf(buf
, NIP6_FMT
, NIP6(sin6
->sin6_addr
));
1906 *port
= be16_to_cpu(sin6
->sin6_port
);
1907 spin_unlock_bh(&conn
->session
->lock
);
1916 iscsi_tcp_conn_bind(struct iscsi_cls_session
*cls_session
,
1917 struct iscsi_cls_conn
*cls_conn
, uint64_t transport_eph
,
1920 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1921 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1923 struct socket
*sock
;
1926 /* lookup for existing socket */
1927 sock
= sockfd_lookup((int)transport_eph
, &err
);
1929 printk(KERN_ERR
"iscsi_tcp: sockfd_lookup failed %d\n", err
);
1933 * copy these values now because if we drop the session
1934 * userspace may still want to query the values since we will
1935 * be using them for the reconnect
1937 err
= iscsi_tcp_get_addr(conn
, sock
, conn
->portal_address
,
1938 &conn
->portal_port
, kernel_getpeername
);
1942 err
= iscsi_tcp_get_addr(conn
, sock
, conn
->local_address
,
1943 &conn
->local_port
, kernel_getsockname
);
1947 err
= iscsi_conn_bind(cls_session
, cls_conn
, is_leading
);
1951 /* bind iSCSI connection and socket */
1952 tcp_conn
->sock
= sock
;
1954 /* setup Socket parameters */
1957 sk
->sk_sndtimeo
= 15 * HZ
; /* FIXME: make it configurable */
1958 sk
->sk_allocation
= GFP_ATOMIC
;
1960 /* FIXME: disable Nagle's algorithm */
1963 * Intercept TCP callbacks for sendfile like receive
1966 conn
->recv_lock
= &sk
->sk_callback_lock
;
1967 iscsi_conn_set_callbacks(conn
);
1968 tcp_conn
->sendpage
= tcp_conn
->sock
->ops
->sendpage
;
1970 * set receive state machine into initial state
1972 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
1980 /* called with host lock */
1982 iscsi_tcp_mgmt_init(struct iscsi_conn
*conn
, struct iscsi_mgmt_task
*mtask
)
1984 struct iscsi_tcp_mgmt_task
*tcp_mtask
= mtask
->dd_data
;
1985 tcp_mtask
->xmstate
= XMSTATE_IMM_HDR_INIT
;
1989 iscsi_r2tpool_alloc(struct iscsi_session
*session
)
1995 * initialize per-task: R2T pool and xmit queue
1997 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
1998 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
1999 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
2002 * pre-allocated x4 as much r2ts to handle race when
2003 * target acks DataOut faster than we data_xmit() queues
2004 * could replenish r2tqueue.
2008 if (iscsi_pool_init(&tcp_ctask
->r2tpool
, session
->max_r2t
* 4,
2009 (void***)&tcp_ctask
->r2ts
,
2010 sizeof(struct iscsi_r2t_info
))) {
2011 goto r2t_alloc_fail
;
2014 /* R2T xmit queue */
2015 tcp_ctask
->r2tqueue
= kfifo_alloc(
2016 session
->max_r2t
* 4 * sizeof(void*), GFP_KERNEL
, NULL
);
2017 if (tcp_ctask
->r2tqueue
== ERR_PTR(-ENOMEM
)) {
2018 iscsi_pool_free(&tcp_ctask
->r2tpool
,
2019 (void**)tcp_ctask
->r2ts
);
2020 goto r2t_alloc_fail
;
2027 for (i
= 0; i
< cmd_i
; i
++) {
2028 struct iscsi_cmd_task
*ctask
= session
->cmds
[i
];
2029 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
2031 kfifo_free(tcp_ctask
->r2tqueue
);
2032 iscsi_pool_free(&tcp_ctask
->r2tpool
,
2033 (void**)tcp_ctask
->r2ts
);
2039 iscsi_r2tpool_free(struct iscsi_session
*session
)
2043 for (i
= 0; i
< session
->cmds_max
; i
++) {
2044 struct iscsi_cmd_task
*ctask
= session
->cmds
[i
];
2045 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
2047 kfifo_free(tcp_ctask
->r2tqueue
);
2048 iscsi_pool_free(&tcp_ctask
->r2tpool
,
2049 (void**)tcp_ctask
->r2ts
);
2054 iscsi_conn_set_param(struct iscsi_cls_conn
*cls_conn
, enum iscsi_param param
,
2055 char *buf
, int buflen
)
2057 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2058 struct iscsi_session
*session
= conn
->session
;
2059 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
2063 case ISCSI_PARAM_HDRDGST_EN
:
2064 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
2065 tcp_conn
->hdr_size
= sizeof(struct iscsi_hdr
);
2066 if (conn
->hdrdgst_en
)
2067 tcp_conn
->hdr_size
+= sizeof(__u32
);
2069 case ISCSI_PARAM_DATADGST_EN
:
2070 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
2071 tcp_conn
->sendpage
= conn
->datadgst_en
?
2072 sock_no_sendpage
: tcp_conn
->sock
->ops
->sendpage
;
2074 case ISCSI_PARAM_MAX_R2T
:
2075 sscanf(buf
, "%d", &value
);
2076 if (session
->max_r2t
== roundup_pow_of_two(value
))
2078 iscsi_r2tpool_free(session
);
2079 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
2080 if (session
->max_r2t
& (session
->max_r2t
- 1))
2081 session
->max_r2t
= roundup_pow_of_two(session
->max_r2t
);
2082 if (iscsi_r2tpool_alloc(session
))
2086 return iscsi_set_param(cls_conn
, param
, buf
, buflen
);
2093 iscsi_tcp_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
2094 enum iscsi_param param
, char *buf
)
2096 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2100 case ISCSI_PARAM_CONN_PORT
:
2101 spin_lock_bh(&conn
->session
->lock
);
2102 len
= sprintf(buf
, "%hu\n", conn
->portal_port
);
2103 spin_unlock_bh(&conn
->session
->lock
);
2105 case ISCSI_PARAM_CONN_ADDRESS
:
2106 spin_lock_bh(&conn
->session
->lock
);
2107 len
= sprintf(buf
, "%s\n", conn
->portal_address
);
2108 spin_unlock_bh(&conn
->session
->lock
);
2111 return iscsi_conn_get_param(cls_conn
, param
, buf
);
2118 iscsi_tcp_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2121 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2125 case ISCSI_HOST_PARAM_IPADDRESS
:
2126 spin_lock_bh(&session
->lock
);
2127 if (!session
->leadconn
)
2130 len
= sprintf(buf
, "%s\n",
2131 session
->leadconn
->local_address
);
2132 spin_unlock_bh(&session
->lock
);
2135 return iscsi_host_get_param(shost
, param
, buf
);
2141 iscsi_conn_get_stats(struct iscsi_cls_conn
*cls_conn
, struct iscsi_stats
*stats
)
2143 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2144 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
2146 stats
->txdata_octets
= conn
->txdata_octets
;
2147 stats
->rxdata_octets
= conn
->rxdata_octets
;
2148 stats
->scsicmd_pdus
= conn
->scsicmd_pdus_cnt
;
2149 stats
->dataout_pdus
= conn
->dataout_pdus_cnt
;
2150 stats
->scsirsp_pdus
= conn
->scsirsp_pdus_cnt
;
2151 stats
->datain_pdus
= conn
->datain_pdus_cnt
;
2152 stats
->r2t_pdus
= conn
->r2t_pdus_cnt
;
2153 stats
->tmfcmd_pdus
= conn
->tmfcmd_pdus_cnt
;
2154 stats
->tmfrsp_pdus
= conn
->tmfrsp_pdus_cnt
;
2155 stats
->custom_length
= 3;
2156 strcpy(stats
->custom
[0].desc
, "tx_sendpage_failures");
2157 stats
->custom
[0].value
= tcp_conn
->sendpage_failures_cnt
;
2158 strcpy(stats
->custom
[1].desc
, "rx_discontiguous_hdr");
2159 stats
->custom
[1].value
= tcp_conn
->discontiguous_hdr_cnt
;
2160 strcpy(stats
->custom
[2].desc
, "eh_abort_cnt");
2161 stats
->custom
[2].value
= conn
->eh_abort_cnt
;
2164 static struct iscsi_cls_session
*
2165 iscsi_tcp_session_create(struct iscsi_transport
*iscsit
,
2166 struct scsi_transport_template
*scsit
,
2167 uint16_t cmds_max
, uint16_t qdepth
,
2168 uint32_t initial_cmdsn
, uint32_t *hostno
)
2170 struct iscsi_cls_session
*cls_session
;
2171 struct iscsi_session
*session
;
2175 cls_session
= iscsi_session_setup(iscsit
, scsit
, cmds_max
, qdepth
,
2176 sizeof(struct iscsi_tcp_cmd_task
),
2177 sizeof(struct iscsi_tcp_mgmt_task
),
2178 initial_cmdsn
, &hn
);
2183 session
= class_to_transport_session(cls_session
);
2184 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
2185 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
2186 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
2188 ctask
->hdr
= &tcp_ctask
->hdr
;
2191 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++) {
2192 struct iscsi_mgmt_task
*mtask
= session
->mgmt_cmds
[cmd_i
];
2193 struct iscsi_tcp_mgmt_task
*tcp_mtask
= mtask
->dd_data
;
2195 mtask
->hdr
= &tcp_mtask
->hdr
;
2198 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session
)))
2199 goto r2tpool_alloc_fail
;
2204 iscsi_session_teardown(cls_session
);
2208 static void iscsi_tcp_session_destroy(struct iscsi_cls_session
*cls_session
)
2210 iscsi_r2tpool_free(class_to_transport_session(cls_session
));
2211 iscsi_session_teardown(cls_session
);
2214 static int iscsi_tcp_slave_configure(struct scsi_device
*sdev
)
2216 blk_queue_bounce_limit(sdev
->request_queue
, BLK_BOUNCE_ANY
);
2217 blk_queue_dma_alignment(sdev
->request_queue
, 0);
2221 static struct scsi_host_template iscsi_sht
= {
2222 .module
= THIS_MODULE
,
2223 .name
= "iSCSI Initiator over TCP/IP",
2224 .queuecommand
= iscsi_queuecommand
,
2225 .change_queue_depth
= iscsi_change_queue_depth
,
2226 .can_queue
= ISCSI_DEF_XMIT_CMDS_MAX
- 1,
2227 .sg_tablesize
= ISCSI_SG_TABLESIZE
,
2228 .max_sectors
= 0xFFFF,
2229 .cmd_per_lun
= ISCSI_DEF_CMD_PER_LUN
,
2230 .eh_abort_handler
= iscsi_eh_abort
,
2231 .eh_host_reset_handler
= iscsi_eh_host_reset
,
2232 .use_clustering
= DISABLE_CLUSTERING
,
2233 .slave_configure
= iscsi_tcp_slave_configure
,
2234 .proc_name
= "iscsi_tcp",
2238 static struct iscsi_transport iscsi_tcp_transport
= {
2239 .owner
= THIS_MODULE
,
2241 .caps
= CAP_RECOVERY_L0
| CAP_MULTI_R2T
| CAP_HDRDGST
2243 .param_mask
= ISCSI_MAX_RECV_DLENGTH
|
2244 ISCSI_MAX_XMIT_DLENGTH
|
2247 ISCSI_INITIAL_R2T_EN
|
2252 ISCSI_PDU_INORDER_EN
|
2253 ISCSI_DATASEQ_INORDER_EN
|
2256 ISCSI_CONN_ADDRESS
|
2258 ISCSI_PERSISTENT_PORT
|
2259 ISCSI_PERSISTENT_ADDRESS
|
2260 ISCSI_TARGET_NAME
| ISCSI_TPGT
|
2261 ISCSI_USERNAME
| ISCSI_PASSWORD
|
2262 ISCSI_USERNAME_IN
| ISCSI_PASSWORD_IN
,
2263 .host_param_mask
= ISCSI_HOST_HWADDRESS
| ISCSI_HOST_IPADDRESS
|
2264 ISCSI_HOST_INITIATOR_NAME
|
2265 ISCSI_HOST_NETDEV_NAME
,
2266 .host_template
= &iscsi_sht
,
2267 .conndata_size
= sizeof(struct iscsi_conn
),
2269 .max_cmd_len
= ISCSI_TCP_MAX_CMD_LEN
,
2270 /* session management */
2271 .create_session
= iscsi_tcp_session_create
,
2272 .destroy_session
= iscsi_tcp_session_destroy
,
2273 /* connection management */
2274 .create_conn
= iscsi_tcp_conn_create
,
2275 .bind_conn
= iscsi_tcp_conn_bind
,
2276 .destroy_conn
= iscsi_tcp_conn_destroy
,
2277 .set_param
= iscsi_conn_set_param
,
2278 .get_conn_param
= iscsi_tcp_conn_get_param
,
2279 .get_session_param
= iscsi_session_get_param
,
2280 .start_conn
= iscsi_conn_start
,
2281 .stop_conn
= iscsi_tcp_conn_stop
,
2282 /* iscsi host params */
2283 .get_host_param
= iscsi_tcp_host_get_param
,
2284 .set_host_param
= iscsi_host_set_param
,
2286 .send_pdu
= iscsi_conn_send_pdu
,
2287 .get_stats
= iscsi_conn_get_stats
,
2288 .init_cmd_task
= iscsi_tcp_cmd_init
,
2289 .init_mgmt_task
= iscsi_tcp_mgmt_init
,
2290 .xmit_cmd_task
= iscsi_tcp_ctask_xmit
,
2291 .xmit_mgmt_task
= iscsi_tcp_mtask_xmit
,
2292 .cleanup_cmd_task
= iscsi_tcp_cleanup_ctask
,
2294 .session_recovery_timedout
= iscsi_session_recovery_timedout
,
2298 iscsi_tcp_init(void)
2300 if (iscsi_max_lun
< 1) {
2301 printk(KERN_ERR
"iscsi_tcp: Invalid max_lun value of %u\n",
2305 iscsi_tcp_transport
.max_lun
= iscsi_max_lun
;
2307 if (!iscsi_register_transport(&iscsi_tcp_transport
))
2314 iscsi_tcp_exit(void)
2316 iscsi_unregister_transport(&iscsi_tcp_transport
);
2319 module_init(iscsi_tcp_init
);
2320 module_exit(iscsi_tcp_exit
);