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
));
83 ibuf
->sg
.offset
= sg
->offset
;
84 ibuf
->sg
.length
= sg
->length
;
86 * Fastpath: sg element fits into single page
88 if (sg
->length
+ sg
->offset
<= PAGE_SIZE
&& !PageSlab(sg_page(sg
)))
89 ibuf
->use_sendmsg
= 0;
91 ibuf
->use_sendmsg
= 1;
96 iscsi_buf_left(struct iscsi_buf
*ibuf
)
100 rc
= ibuf
->sg
.length
- ibuf
->sent
;
106 iscsi_hdr_digest(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
,
109 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
111 crypto_hash_digest(&tcp_conn
->tx_hash
, &buf
->sg
, buf
->sg
.length
, crc
);
112 buf
->sg
.length
+= sizeof(u32
);
116 iscsi_hdr_extract(struct iscsi_tcp_conn
*tcp_conn
)
118 struct sk_buff
*skb
= tcp_conn
->in
.skb
;
120 tcp_conn
->in
.zero_copy_hdr
= 0;
122 if (tcp_conn
->in
.copy
>= tcp_conn
->hdr_size
&&
123 tcp_conn
->in_progress
== IN_PROGRESS_WAIT_HEADER
) {
125 * Zero-copy PDU Header: using connection context
126 * to store header pointer.
128 if (skb_shinfo(skb
)->frag_list
== NULL
&&
129 !skb_shinfo(skb
)->nr_frags
) {
130 tcp_conn
->in
.hdr
= (struct iscsi_hdr
*)
131 ((char*)skb
->data
+ tcp_conn
->in
.offset
);
132 tcp_conn
->in
.zero_copy_hdr
= 1;
134 /* ignoring return code since we checked
136 skb_copy_bits(skb
, tcp_conn
->in
.offset
,
137 &tcp_conn
->hdr
, tcp_conn
->hdr_size
);
138 tcp_conn
->in
.hdr
= &tcp_conn
->hdr
;
140 tcp_conn
->in
.offset
+= tcp_conn
->hdr_size
;
141 tcp_conn
->in
.copy
-= tcp_conn
->hdr_size
;
147 * PDU header scattered across SKB's,
148 * copying it... This'll happen quite rarely.
151 if (tcp_conn
->in_progress
== IN_PROGRESS_WAIT_HEADER
)
152 tcp_conn
->in
.hdr_offset
= 0;
154 hdr_remains
= tcp_conn
->hdr_size
- tcp_conn
->in
.hdr_offset
;
155 BUG_ON(hdr_remains
<= 0);
157 copylen
= min(tcp_conn
->in
.copy
, hdr_remains
);
158 skb_copy_bits(skb
, tcp_conn
->in
.offset
,
159 (char*)&tcp_conn
->hdr
+ tcp_conn
->in
.hdr_offset
,
162 debug_tcp("PDU gather offset %d bytes %d in.offset %d "
163 "in.copy %d\n", tcp_conn
->in
.hdr_offset
, copylen
,
164 tcp_conn
->in
.offset
, tcp_conn
->in
.copy
);
166 tcp_conn
->in
.offset
+= copylen
;
167 tcp_conn
->in
.copy
-= copylen
;
168 if (copylen
< hdr_remains
) {
169 tcp_conn
->in_progress
= IN_PROGRESS_HEADER_GATHER
;
170 tcp_conn
->in
.hdr_offset
+= copylen
;
173 tcp_conn
->in
.hdr
= &tcp_conn
->hdr
;
174 tcp_conn
->discontiguous_hdr_cnt
++;
175 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
182 * must be called with session lock
185 iscsi_tcp_cleanup_ctask(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
187 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
188 struct iscsi_r2t_info
*r2t
;
189 struct scsi_cmnd
*sc
;
191 /* flush ctask's r2t queues */
192 while (__kfifo_get(tcp_ctask
->r2tqueue
, (void*)&r2t
, sizeof(void*))) {
193 __kfifo_put(tcp_ctask
->r2tpool
.queue
, (void*)&r2t
,
195 debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
202 tcp_ctask
->xmstate
= XMSTATE_IDLE
;
203 tcp_ctask
->r2t
= NULL
;
207 * iscsi_data_rsp - SCSI Data-In Response processing
208 * @conn: iscsi connection
209 * @ctask: scsi command task
212 iscsi_data_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
214 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
215 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
216 struct iscsi_data_rsp
*rhdr
= (struct iscsi_data_rsp
*)tcp_conn
->in
.hdr
;
217 struct iscsi_session
*session
= conn
->session
;
218 struct scsi_cmnd
*sc
= ctask
->sc
;
219 int datasn
= be32_to_cpu(rhdr
->datasn
);
221 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
223 * setup Data-In byte counter (gets decremented..)
225 ctask
->data_count
= tcp_conn
->in
.datalen
;
227 if (tcp_conn
->in
.datalen
== 0)
230 if (tcp_ctask
->exp_datasn
!= datasn
) {
231 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n",
232 __FUNCTION__
, tcp_ctask
->exp_datasn
, datasn
);
233 return ISCSI_ERR_DATASN
;
236 tcp_ctask
->exp_datasn
++;
238 tcp_ctask
->data_offset
= be32_to_cpu(rhdr
->offset
);
239 if (tcp_ctask
->data_offset
+ tcp_conn
->in
.datalen
> scsi_bufflen(sc
)) {
240 debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
241 __FUNCTION__
, tcp_ctask
->data_offset
,
242 tcp_conn
->in
.datalen
, scsi_bufflen(sc
));
243 return ISCSI_ERR_DATA_OFFSET
;
246 if (rhdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
247 conn
->exp_statsn
= be32_to_cpu(rhdr
->statsn
) + 1;
248 if (rhdr
->flags
& ISCSI_FLAG_DATA_UNDERFLOW
) {
249 int res_count
= be32_to_cpu(rhdr
->residual_count
);
252 res_count
<= scsi_bufflen(sc
)) {
253 scsi_set_resid(sc
, res_count
);
254 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
256 sc
->result
= (DID_BAD_TARGET
<< 16) |
258 } else if (rhdr
->flags
& ISCSI_FLAG_DATA_OVERFLOW
) {
259 scsi_set_resid(sc
, be32_to_cpu(rhdr
->residual_count
));
260 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
262 sc
->result
= (DID_OK
<< 16) | rhdr
->cmd_status
;
265 conn
->datain_pdus_cnt
++;
270 * iscsi_solicit_data_init - initialize first Data-Out
271 * @conn: iscsi connection
272 * @ctask: scsi command task
276 * Initialize first Data-Out within this R2T sequence and finds
277 * proper data_offset within this SCSI command.
279 * This function is called with connection lock taken.
282 iscsi_solicit_data_init(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
283 struct iscsi_r2t_info
*r2t
)
285 struct iscsi_data
*hdr
;
286 struct scsi_cmnd
*sc
= ctask
->sc
;
288 struct scatterlist
*sg
;
290 hdr
= &r2t
->dtask
.hdr
;
291 memset(hdr
, 0, sizeof(struct iscsi_data
));
293 hdr
->datasn
= cpu_to_be32(r2t
->solicit_datasn
);
294 r2t
->solicit_datasn
++;
295 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
296 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
297 hdr
->itt
= ctask
->hdr
->itt
;
298 hdr
->exp_statsn
= r2t
->exp_statsn
;
299 hdr
->offset
= cpu_to_be32(r2t
->data_offset
);
300 if (r2t
->data_length
> conn
->max_xmit_dlength
) {
301 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
302 r2t
->data_count
= conn
->max_xmit_dlength
;
305 hton24(hdr
->dlength
, r2t
->data_length
);
306 r2t
->data_count
= r2t
->data_length
;
307 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
309 conn
->dataout_pdus_cnt
++;
313 iscsi_buf_init_iov(&r2t
->headbuf
, (char*)hdr
,
314 sizeof(struct iscsi_hdr
));
316 sg
= scsi_sglist(sc
);
318 for (i
= 0; i
< scsi_sg_count(sc
); i
++, sg
+= 1) {
319 /* FIXME: prefetch ? */
320 if (sg_count
+ sg
->length
> r2t
->data_offset
) {
325 /* offset within this page */
326 page_offset
= r2t
->data_offset
- sg_count
;
328 /* fill in this buffer */
329 iscsi_buf_init_sg(&r2t
->sendbuf
, sg
);
330 r2t
->sendbuf
.sg
.offset
+= page_offset
;
331 r2t
->sendbuf
.sg
.length
-= page_offset
;
333 /* xmit logic will continue with next one */
337 sg_count
+= sg
->length
;
339 BUG_ON(r2t
->sg
== NULL
);
343 * iscsi_r2t_rsp - iSCSI R2T Response processing
344 * @conn: iscsi connection
345 * @ctask: scsi command task
348 iscsi_r2t_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
350 struct iscsi_r2t_info
*r2t
;
351 struct iscsi_session
*session
= conn
->session
;
352 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
353 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
354 struct iscsi_r2t_rsp
*rhdr
= (struct iscsi_r2t_rsp
*)tcp_conn
->in
.hdr
;
355 int r2tsn
= be32_to_cpu(rhdr
->r2tsn
);
358 if (tcp_conn
->in
.datalen
) {
359 printk(KERN_ERR
"iscsi_tcp: invalid R2t with datalen %d\n",
360 tcp_conn
->in
.datalen
);
361 return ISCSI_ERR_DATALEN
;
364 if (tcp_ctask
->exp_datasn
!= r2tsn
){
365 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
366 __FUNCTION__
, tcp_ctask
->exp_datasn
, r2tsn
);
367 return ISCSI_ERR_R2TSN
;
370 /* fill-in new R2T associated with the task */
371 spin_lock(&session
->lock
);
372 iscsi_update_cmdsn(session
, (struct iscsi_nopin
*)rhdr
);
374 if (!ctask
->sc
|| ctask
->mtask
||
375 session
->state
!= ISCSI_STATE_LOGGED_IN
) {
376 printk(KERN_INFO
"iscsi_tcp: dropping R2T itt %d in "
377 "recovery...\n", ctask
->itt
);
378 spin_unlock(&session
->lock
);
382 rc
= __kfifo_get(tcp_ctask
->r2tpool
.queue
, (void*)&r2t
, sizeof(void*));
385 r2t
->exp_statsn
= rhdr
->statsn
;
386 r2t
->data_length
= be32_to_cpu(rhdr
->data_length
);
387 if (r2t
->data_length
== 0) {
388 printk(KERN_ERR
"iscsi_tcp: invalid R2T with zero data len\n");
389 spin_unlock(&session
->lock
);
390 return ISCSI_ERR_DATALEN
;
393 if (r2t
->data_length
> session
->max_burst
)
394 debug_scsi("invalid R2T with data len %u and max burst %u."
395 "Attempting to execute request.\n",
396 r2t
->data_length
, session
->max_burst
);
398 r2t
->data_offset
= be32_to_cpu(rhdr
->data_offset
);
399 if (r2t
->data_offset
+ r2t
->data_length
> scsi_bufflen(ctask
->sc
)) {
400 spin_unlock(&session
->lock
);
401 printk(KERN_ERR
"iscsi_tcp: invalid R2T with data len %u at "
402 "offset %u and total length %d\n", r2t
->data_length
,
403 r2t
->data_offset
, scsi_bufflen(ctask
->sc
));
404 return ISCSI_ERR_DATALEN
;
407 r2t
->ttt
= rhdr
->ttt
; /* no flip */
408 r2t
->solicit_datasn
= 0;
410 iscsi_solicit_data_init(conn
, ctask
, r2t
);
412 tcp_ctask
->exp_datasn
= r2tsn
+ 1;
413 __kfifo_put(tcp_ctask
->r2tqueue
, (void*)&r2t
, sizeof(void*));
414 tcp_ctask
->xmstate
|= XMSTATE_SOL_HDR_INIT
;
415 list_move_tail(&ctask
->running
, &conn
->xmitqueue
);
417 scsi_queue_work(session
->host
, &conn
->xmitwork
);
418 conn
->r2t_pdus_cnt
++;
419 spin_unlock(&session
->lock
);
425 iscsi_tcp_hdr_recv(struct iscsi_conn
*conn
)
427 int rc
= 0, opcode
, ahslen
;
428 struct iscsi_hdr
*hdr
;
429 struct iscsi_session
*session
= conn
->session
;
430 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
431 uint32_t cdgst
, rdgst
= 0, itt
;
433 hdr
= tcp_conn
->in
.hdr
;
435 /* verify PDU length */
436 tcp_conn
->in
.datalen
= ntoh24(hdr
->dlength
);
437 if (tcp_conn
->in
.datalen
> conn
->max_recv_dlength
) {
438 printk(KERN_ERR
"iscsi_tcp: datalen %d > %d\n",
439 tcp_conn
->in
.datalen
, conn
->max_recv_dlength
);
440 return ISCSI_ERR_DATALEN
;
442 tcp_conn
->data_copied
= 0;
445 ahslen
= hdr
->hlength
<< 2;
446 tcp_conn
->in
.offset
+= ahslen
;
447 tcp_conn
->in
.copy
-= ahslen
;
448 if (tcp_conn
->in
.copy
< 0) {
449 printk(KERN_ERR
"iscsi_tcp: can't handle AHS with length "
450 "%d bytes\n", ahslen
);
451 return ISCSI_ERR_AHSLEN
;
454 /* calculate read padding */
455 tcp_conn
->in
.padding
= tcp_conn
->in
.datalen
& (ISCSI_PAD_LEN
-1);
456 if (tcp_conn
->in
.padding
) {
457 tcp_conn
->in
.padding
= ISCSI_PAD_LEN
- tcp_conn
->in
.padding
;
458 debug_scsi("read padding %d bytes\n", tcp_conn
->in
.padding
);
461 if (conn
->hdrdgst_en
) {
462 struct scatterlist sg
;
464 sg_init_one(&sg
, (u8
*)hdr
,
465 sizeof(struct iscsi_hdr
) + ahslen
);
466 crypto_hash_digest(&tcp_conn
->rx_hash
, &sg
, sg
.length
,
468 rdgst
= *(uint32_t*)((char*)hdr
+ sizeof(struct iscsi_hdr
) +
470 if (cdgst
!= rdgst
) {
471 printk(KERN_ERR
"iscsi_tcp: hdrdgst error "
472 "recv 0x%x calc 0x%x\n", rdgst
, cdgst
);
473 return ISCSI_ERR_HDR_DGST
;
477 opcode
= hdr
->opcode
& ISCSI_OPCODE_MASK
;
478 /* verify itt (itt encoding: age+cid+itt) */
479 rc
= iscsi_verify_itt(conn
, hdr
, &itt
);
480 if (rc
== ISCSI_ERR_NO_SCSI_CMD
) {
481 tcp_conn
->in
.datalen
= 0; /* force drop */
486 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
487 opcode
, tcp_conn
->in
.offset
, tcp_conn
->in
.copy
,
488 ahslen
, tcp_conn
->in
.datalen
);
491 case ISCSI_OP_SCSI_DATA_IN
:
492 tcp_conn
->in
.ctask
= session
->cmds
[itt
];
493 rc
= iscsi_data_rsp(conn
, tcp_conn
->in
.ctask
);
497 case ISCSI_OP_SCSI_CMD_RSP
:
498 tcp_conn
->in
.ctask
= session
->cmds
[itt
];
499 if (tcp_conn
->in
.datalen
)
502 spin_lock(&session
->lock
);
503 rc
= __iscsi_complete_pdu(conn
, hdr
, NULL
, 0);
504 spin_unlock(&session
->lock
);
507 tcp_conn
->in
.ctask
= session
->cmds
[itt
];
509 rc
= ISCSI_ERR_AHSLEN
;
510 else if (tcp_conn
->in
.ctask
->sc
->sc_data_direction
==
512 rc
= iscsi_r2t_rsp(conn
, tcp_conn
->in
.ctask
);
514 rc
= ISCSI_ERR_PROTO
;
516 case ISCSI_OP_LOGIN_RSP
:
517 case ISCSI_OP_TEXT_RSP
:
518 case ISCSI_OP_REJECT
:
519 case ISCSI_OP_ASYNC_EVENT
:
521 * It is possible that we could get a PDU with a buffer larger
522 * than 8K, but there are no targets that currently do this.
523 * For now we fail until we find a vendor that needs it
525 if (ISCSI_DEF_MAX_RECV_SEG_LEN
<
526 tcp_conn
->in
.datalen
) {
527 printk(KERN_ERR
"iscsi_tcp: received buffer of len %u "
528 "but conn buffer is only %u (opcode %0x)\n",
529 tcp_conn
->in
.datalen
,
530 ISCSI_DEF_MAX_RECV_SEG_LEN
, opcode
);
531 rc
= ISCSI_ERR_PROTO
;
535 if (tcp_conn
->in
.datalen
)
538 case ISCSI_OP_LOGOUT_RSP
:
539 case ISCSI_OP_NOOP_IN
:
540 case ISCSI_OP_SCSI_TMFUNC_RSP
:
541 rc
= iscsi_complete_pdu(conn
, hdr
, NULL
, 0);
544 rc
= ISCSI_ERR_BAD_OPCODE
;
552 * if we did zero copy for the header but we will need multiple
553 * skbs to complete the command then we have to copy the header
556 if (tcp_conn
->in
.zero_copy_hdr
&& tcp_conn
->in
.copy
<=
557 (tcp_conn
->in
.datalen
+ tcp_conn
->in
.padding
+
558 (conn
->datadgst_en
? 4 : 0))) {
559 debug_tcp("Copying header for later use. in.copy %d in.datalen"
560 " %d\n", tcp_conn
->in
.copy
, tcp_conn
->in
.datalen
);
561 memcpy(&tcp_conn
->hdr
, tcp_conn
->in
.hdr
,
562 sizeof(struct iscsi_hdr
));
563 tcp_conn
->in
.hdr
= &tcp_conn
->hdr
;
564 tcp_conn
->in
.zero_copy_hdr
= 0;
570 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
571 * @conn: iscsi tcp connection
572 * @ctask: scsi command task
573 * @buf: buffer to copy to
574 * @buf_size: size of buffer
575 * @offset: offset within the buffer
578 * The function calls skb_copy_bits() and updates per-connection and
579 * per-cmd byte counters.
581 * Read counters (in bytes):
583 * conn->in.offset offset within in progress SKB
584 * conn->in.copy left to copy from in progress SKB
586 * conn->in.copied copied already from in progress SKB
587 * conn->data_copied copied already from in progress buffer
588 * ctask->sent total bytes sent up to the MidLayer
589 * ctask->data_count left to copy from in progress Data-In
590 * buf_left left to copy from in progress buffer
593 iscsi_ctask_copy(struct iscsi_tcp_conn
*tcp_conn
, struct iscsi_cmd_task
*ctask
,
594 void *buf
, int buf_size
, int offset
)
596 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
597 int buf_left
= buf_size
- (tcp_conn
->data_copied
+ offset
);
598 unsigned size
= min(tcp_conn
->in
.copy
, buf_left
);
601 size
= min(size
, ctask
->data_count
);
603 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
604 size
, tcp_conn
->in
.offset
, tcp_conn
->in
.copied
);
607 BUG_ON(tcp_ctask
->sent
+ size
> scsi_bufflen(ctask
->sc
));
609 rc
= skb_copy_bits(tcp_conn
->in
.skb
, tcp_conn
->in
.offset
,
610 (char*)buf
+ (offset
+ tcp_conn
->data_copied
), size
);
611 /* must fit into skb->len */
614 tcp_conn
->in
.offset
+= size
;
615 tcp_conn
->in
.copy
-= size
;
616 tcp_conn
->in
.copied
+= size
;
617 tcp_conn
->data_copied
+= size
;
618 tcp_ctask
->sent
+= size
;
619 ctask
->data_count
-= size
;
621 BUG_ON(tcp_conn
->in
.copy
< 0);
622 BUG_ON(ctask
->data_count
< 0);
624 if (buf_size
!= (tcp_conn
->data_copied
+ offset
)) {
625 if (!ctask
->data_count
) {
626 BUG_ON(buf_size
- tcp_conn
->data_copied
< 0);
627 /* done with this PDU */
628 return buf_size
- tcp_conn
->data_copied
;
633 /* done with this buffer or with both - PDU and buffer */
634 tcp_conn
->data_copied
= 0;
639 * iscsi_tcp_copy - copy skb bits to the destanation buffer
640 * @conn: iscsi tcp connection
643 * The function calls skb_copy_bits() and updates per-connection
647 iscsi_tcp_copy(struct iscsi_conn
*conn
, int buf_size
)
649 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
650 int buf_left
= buf_size
- tcp_conn
->data_copied
;
651 int size
= min(tcp_conn
->in
.copy
, buf_left
);
654 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
655 size
, tcp_conn
->in
.offset
, tcp_conn
->data_copied
);
658 rc
= skb_copy_bits(tcp_conn
->in
.skb
, tcp_conn
->in
.offset
,
659 (char*)conn
->data
+ tcp_conn
->data_copied
, size
);
662 tcp_conn
->in
.offset
+= size
;
663 tcp_conn
->in
.copy
-= size
;
664 tcp_conn
->in
.copied
+= size
;
665 tcp_conn
->data_copied
+= size
;
667 if (buf_size
!= tcp_conn
->data_copied
)
674 partial_sg_digest_update(struct hash_desc
*desc
, struct scatterlist
*sg
,
675 int offset
, int length
)
677 struct scatterlist temp
;
679 memcpy(&temp
, sg
, sizeof(struct scatterlist
));
680 temp
.offset
= offset
;
681 temp
.length
= length
;
682 crypto_hash_update(desc
, &temp
, length
);
686 iscsi_recv_digest_update(struct iscsi_tcp_conn
*tcp_conn
, char* buf
, int len
)
688 struct scatterlist tmp
;
690 sg_init_one(&tmp
, buf
, len
);
691 crypto_hash_update(&tcp_conn
->rx_hash
, &tmp
, len
);
694 static int iscsi_scsi_data_in(struct iscsi_conn
*conn
)
696 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
697 struct iscsi_cmd_task
*ctask
= tcp_conn
->in
.ctask
;
698 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
699 struct scsi_cmnd
*sc
= ctask
->sc
;
700 struct scatterlist
*sg
;
701 int i
, offset
, rc
= 0;
703 BUG_ON((void*)ctask
!= sc
->SCp
.ptr
);
705 offset
= tcp_ctask
->data_offset
;
706 sg
= scsi_sglist(sc
);
708 if (tcp_ctask
->data_offset
)
709 for (i
= 0; i
< tcp_ctask
->sg_count
; i
++)
710 offset
-= sg
[i
].length
;
711 /* we've passed through partial sg*/
715 for (i
= tcp_ctask
->sg_count
; i
< scsi_sg_count(sc
); i
++) {
718 dest
= kmap_atomic(sg_page(&sg
[i
]), KM_SOFTIRQ0
);
719 rc
= iscsi_ctask_copy(tcp_conn
, ctask
, dest
+ sg
[i
].offset
,
720 sg
[i
].length
, offset
);
721 kunmap_atomic(dest
, KM_SOFTIRQ0
);
723 /* continue with the next SKB/PDU */
726 if (conn
->datadgst_en
) {
730 &sg
[i
], sg
[i
].length
);
732 partial_sg_digest_update(
735 sg
[i
].offset
+ offset
,
736 sg
[i
].length
- offset
);
739 tcp_ctask
->sg_count
++;
742 if (!ctask
->data_count
) {
743 if (rc
&& conn
->datadgst_en
)
745 * data-in is complete, but buffer not...
747 partial_sg_digest_update(&tcp_conn
->rx_hash
,
755 if (!tcp_conn
->in
.copy
)
758 BUG_ON(ctask
->data_count
);
760 /* check for non-exceptional status */
761 if (tcp_conn
->in
.hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
762 debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
763 (long)sc
, sc
->result
, ctask
->itt
,
764 tcp_conn
->in
.hdr
->flags
);
765 spin_lock(&conn
->session
->lock
);
766 __iscsi_complete_pdu(conn
, tcp_conn
->in
.hdr
, NULL
, 0);
767 spin_unlock(&conn
->session
->lock
);
774 iscsi_data_recv(struct iscsi_conn
*conn
)
776 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
779 opcode
= tcp_conn
->in
.hdr
->opcode
& ISCSI_OPCODE_MASK
;
781 case ISCSI_OP_SCSI_DATA_IN
:
782 rc
= iscsi_scsi_data_in(conn
);
784 case ISCSI_OP_SCSI_CMD_RSP
:
785 case ISCSI_OP_TEXT_RSP
:
786 case ISCSI_OP_LOGIN_RSP
:
787 case ISCSI_OP_ASYNC_EVENT
:
788 case ISCSI_OP_REJECT
:
790 * Collect data segment to the connection's data
793 if (iscsi_tcp_copy(conn
, tcp_conn
->in
.datalen
)) {
798 rc
= iscsi_complete_pdu(conn
, tcp_conn
->in
.hdr
, conn
->data
,
799 tcp_conn
->in
.datalen
);
800 if (!rc
&& conn
->datadgst_en
&& opcode
!= ISCSI_OP_LOGIN_RSP
)
801 iscsi_recv_digest_update(tcp_conn
, conn
->data
,
802 tcp_conn
->in
.datalen
);
812 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
813 * @rd_desc: read descriptor
814 * @skb: socket buffer
815 * @offset: offset in skb
816 * @len: skb->len - offset
819 iscsi_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
,
820 unsigned int offset
, size_t len
)
823 struct iscsi_conn
*conn
= rd_desc
->arg
.data
;
824 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
826 char pad
[ISCSI_PAD_LEN
];
827 struct scatterlist sg
;
830 * Save current SKB and its offset in the corresponding
831 * connection context.
833 tcp_conn
->in
.copy
= skb
->len
- offset
;
834 tcp_conn
->in
.offset
= offset
;
835 tcp_conn
->in
.skb
= skb
;
836 tcp_conn
->in
.len
= tcp_conn
->in
.copy
;
837 BUG_ON(tcp_conn
->in
.copy
<= 0);
838 debug_tcp("in %d bytes\n", tcp_conn
->in
.copy
);
841 tcp_conn
->in
.copied
= 0;
844 if (unlikely(conn
->suspend_rx
)) {
845 debug_tcp("conn %d Rx suspended!\n", conn
->id
);
849 if (tcp_conn
->in_progress
== IN_PROGRESS_WAIT_HEADER
||
850 tcp_conn
->in_progress
== IN_PROGRESS_HEADER_GATHER
) {
851 rc
= iscsi_hdr_extract(tcp_conn
);
856 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
862 * Verify and process incoming PDU header.
864 rc
= iscsi_tcp_hdr_recv(conn
);
865 if (!rc
&& tcp_conn
->in
.datalen
) {
866 if (conn
->datadgst_en
)
867 crypto_hash_init(&tcp_conn
->rx_hash
);
868 tcp_conn
->in_progress
= IN_PROGRESS_DATA_RECV
;
870 iscsi_conn_failure(conn
, rc
);
875 if (tcp_conn
->in_progress
== IN_PROGRESS_DDIGEST_RECV
&&
877 uint32_t recv_digest
;
879 debug_tcp("extra data_recv offset %d copy %d\n",
880 tcp_conn
->in
.offset
, tcp_conn
->in
.copy
);
882 if (!tcp_conn
->data_copied
) {
883 if (tcp_conn
->in
.padding
) {
884 debug_tcp("padding -> %d\n",
885 tcp_conn
->in
.padding
);
886 memset(pad
, 0, tcp_conn
->in
.padding
);
887 sg_init_one(&sg
, pad
, tcp_conn
->in
.padding
);
888 crypto_hash_update(&tcp_conn
->rx_hash
,
891 crypto_hash_final(&tcp_conn
->rx_hash
,
892 (u8
*) &tcp_conn
->in
.datadgst
);
893 debug_tcp("rx digest 0x%x\n", tcp_conn
->in
.datadgst
);
896 rc
= iscsi_tcp_copy(conn
, sizeof(uint32_t));
900 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
904 memcpy(&recv_digest
, conn
->data
, sizeof(uint32_t));
905 if (recv_digest
!= tcp_conn
->in
.datadgst
) {
906 debug_tcp("iscsi_tcp: data digest error!"
907 "0x%x != 0x%x\n", recv_digest
,
908 tcp_conn
->in
.datadgst
);
909 iscsi_conn_failure(conn
, ISCSI_ERR_DATA_DGST
);
912 debug_tcp("iscsi_tcp: data digest match!"
913 "0x%x == 0x%x\n", recv_digest
,
914 tcp_conn
->in
.datadgst
);
915 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
919 if (tcp_conn
->in_progress
== IN_PROGRESS_DATA_RECV
&&
921 debug_tcp("data_recv offset %d copy %d\n",
922 tcp_conn
->in
.offset
, tcp_conn
->in
.copy
);
924 rc
= iscsi_data_recv(conn
);
928 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
932 if (tcp_conn
->in
.padding
)
933 tcp_conn
->in_progress
= IN_PROGRESS_PAD_RECV
;
934 else if (conn
->datadgst_en
)
935 tcp_conn
->in_progress
= IN_PROGRESS_DDIGEST_RECV
;
937 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
938 tcp_conn
->data_copied
= 0;
941 if (tcp_conn
->in_progress
== IN_PROGRESS_PAD_RECV
&&
943 int copylen
= min(tcp_conn
->in
.padding
- tcp_conn
->data_copied
,
946 tcp_conn
->in
.copy
-= copylen
;
947 tcp_conn
->in
.offset
+= copylen
;
948 tcp_conn
->data_copied
+= copylen
;
950 if (tcp_conn
->data_copied
!= tcp_conn
->in
.padding
)
951 tcp_conn
->in_progress
= IN_PROGRESS_PAD_RECV
;
952 else if (conn
->datadgst_en
)
953 tcp_conn
->in_progress
= IN_PROGRESS_DDIGEST_RECV
;
955 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
956 tcp_conn
->data_copied
= 0;
959 debug_tcp("f, processed %d from out of %d padding %d\n",
960 tcp_conn
->in
.offset
- offset
, (int)len
, tcp_conn
->in
.padding
);
961 BUG_ON(tcp_conn
->in
.offset
- offset
> len
);
963 if (tcp_conn
->in
.offset
- offset
!= len
) {
964 debug_tcp("continue to process %d bytes\n",
965 (int)len
- (tcp_conn
->in
.offset
- offset
));
970 processed
= tcp_conn
->in
.offset
- offset
;
971 BUG_ON(processed
== 0);
975 processed
= tcp_conn
->in
.offset
- offset
;
976 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
977 processed
, (int)len
, (int)rd_desc
->count
);
978 BUG_ON(processed
== 0);
979 BUG_ON(processed
> len
);
981 conn
->rxdata_octets
+= processed
;
986 iscsi_tcp_data_ready(struct sock
*sk
, int flag
)
988 struct iscsi_conn
*conn
= sk
->sk_user_data
;
989 read_descriptor_t rd_desc
;
991 read_lock(&sk
->sk_callback_lock
);
994 * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
995 * We set count to 1 because we want the network layer to
996 * hand us all the skbs that are available. iscsi_tcp_data_recv
997 * handled pdus that cross buffers or pdus that still need data.
999 rd_desc
.arg
.data
= conn
;
1001 tcp_read_sock(sk
, &rd_desc
, iscsi_tcp_data_recv
);
1003 read_unlock(&sk
->sk_callback_lock
);
1007 iscsi_tcp_state_change(struct sock
*sk
)
1009 struct iscsi_tcp_conn
*tcp_conn
;
1010 struct iscsi_conn
*conn
;
1011 struct iscsi_session
*session
;
1012 void (*old_state_change
)(struct sock
*);
1014 read_lock(&sk
->sk_callback_lock
);
1016 conn
= (struct iscsi_conn
*)sk
->sk_user_data
;
1017 session
= conn
->session
;
1019 if ((sk
->sk_state
== TCP_CLOSE_WAIT
||
1020 sk
->sk_state
== TCP_CLOSE
) &&
1021 !atomic_read(&sk
->sk_rmem_alloc
)) {
1022 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1023 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1026 tcp_conn
= conn
->dd_data
;
1027 old_state_change
= tcp_conn
->old_state_change
;
1029 read_unlock(&sk
->sk_callback_lock
);
1031 old_state_change(sk
);
1035 * iscsi_write_space - Called when more output buffer space is available
1036 * @sk: socket space is available for
1039 iscsi_write_space(struct sock
*sk
)
1041 struct iscsi_conn
*conn
= (struct iscsi_conn
*)sk
->sk_user_data
;
1042 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1044 tcp_conn
->old_write_space(sk
);
1045 debug_tcp("iscsi_write_space: cid %d\n", conn
->id
);
1046 scsi_queue_work(conn
->session
->host
, &conn
->xmitwork
);
1050 iscsi_conn_set_callbacks(struct iscsi_conn
*conn
)
1052 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1053 struct sock
*sk
= tcp_conn
->sock
->sk
;
1055 /* assign new callbacks */
1056 write_lock_bh(&sk
->sk_callback_lock
);
1057 sk
->sk_user_data
= conn
;
1058 tcp_conn
->old_data_ready
= sk
->sk_data_ready
;
1059 tcp_conn
->old_state_change
= sk
->sk_state_change
;
1060 tcp_conn
->old_write_space
= sk
->sk_write_space
;
1061 sk
->sk_data_ready
= iscsi_tcp_data_ready
;
1062 sk
->sk_state_change
= iscsi_tcp_state_change
;
1063 sk
->sk_write_space
= iscsi_write_space
;
1064 write_unlock_bh(&sk
->sk_callback_lock
);
1068 iscsi_conn_restore_callbacks(struct iscsi_tcp_conn
*tcp_conn
)
1070 struct sock
*sk
= tcp_conn
->sock
->sk
;
1072 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1073 write_lock_bh(&sk
->sk_callback_lock
);
1074 sk
->sk_user_data
= NULL
;
1075 sk
->sk_data_ready
= tcp_conn
->old_data_ready
;
1076 sk
->sk_state_change
= tcp_conn
->old_state_change
;
1077 sk
->sk_write_space
= tcp_conn
->old_write_space
;
1078 sk
->sk_no_check
= 0;
1079 write_unlock_bh(&sk
->sk_callback_lock
);
1083 * iscsi_send - generic send routine
1084 * @sk: kernel's socket
1085 * @buf: buffer to write from
1086 * @size: actual size to write
1087 * @flags: socket's flags
1090 iscsi_send(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
, int size
, int flags
)
1092 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1093 struct socket
*sk
= tcp_conn
->sock
;
1094 int offset
= buf
->sg
.offset
+ buf
->sent
, res
;
1097 * if we got use_sg=0 or are sending something we kmallocd
1098 * then we did not have to do kmap (kmap returns page_address)
1100 * if we got use_sg > 0, but had to drop down, we do not
1101 * set clustering so this should only happen for that
1104 if (buf
->use_sendmsg
)
1105 res
= sock_no_sendpage(sk
, sg_page(&buf
->sg
), offset
, size
, flags
);
1107 res
= tcp_conn
->sendpage(sk
, sg_page(&buf
->sg
), offset
, size
, flags
);
1110 conn
->txdata_octets
+= res
;
1115 tcp_conn
->sendpage_failures_cnt
++;
1119 iscsi_conn_failure(conn
, ISCSI_ERR_CONN_FAILED
);
1124 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1125 * @conn: iscsi connection
1126 * @buf: buffer to write from
1127 * @datalen: lenght of data to be sent after the header
1133 iscsi_sendhdr(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
, int datalen
)
1135 int flags
= 0; /* MSG_DONTWAIT; */
1138 size
= buf
->sg
.length
- buf
->sent
;
1139 BUG_ON(buf
->sent
+ size
> buf
->sg
.length
);
1140 if (buf
->sent
+ size
!= buf
->sg
.length
|| datalen
)
1143 res
= iscsi_send(conn
, buf
, size
, flags
);
1144 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size
, buf
->sent
, res
);
1155 * iscsi_sendpage - send one page of iSCSI Data-Out.
1156 * @conn: iscsi connection
1157 * @buf: buffer to write from
1158 * @count: remaining data
1159 * @sent: number of bytes sent
1165 iscsi_sendpage(struct iscsi_conn
*conn
, struct iscsi_buf
*buf
,
1166 int *count
, int *sent
)
1168 int flags
= 0; /* MSG_DONTWAIT; */
1171 size
= buf
->sg
.length
- buf
->sent
;
1172 BUG_ON(buf
->sent
+ size
> buf
->sg
.length
);
1175 if (buf
->sent
+ size
!= buf
->sg
.length
|| *count
!= size
)
1178 res
= iscsi_send(conn
, buf
, size
, flags
);
1179 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1180 size
, buf
->sent
, *count
, *sent
, res
);
1193 iscsi_data_digest_init(struct iscsi_tcp_conn
*tcp_conn
,
1194 struct iscsi_tcp_cmd_task
*tcp_ctask
)
1196 crypto_hash_init(&tcp_conn
->tx_hash
);
1197 tcp_ctask
->digest_count
= 4;
1201 * iscsi_solicit_data_cont - initialize next Data-Out
1202 * @conn: iscsi connection
1203 * @ctask: scsi command task
1205 * @left: bytes left to transfer
1208 * Initialize next Data-Out within this R2T sequence and continue
1209 * to process next Scatter-Gather element(if any) of this SCSI command.
1211 * Called under connection lock.
1214 iscsi_solicit_data_cont(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1215 struct iscsi_r2t_info
*r2t
, int left
)
1217 struct iscsi_data
*hdr
;
1220 hdr
= &r2t
->dtask
.hdr
;
1221 memset(hdr
, 0, sizeof(struct iscsi_data
));
1222 hdr
->ttt
= r2t
->ttt
;
1223 hdr
->datasn
= cpu_to_be32(r2t
->solicit_datasn
);
1224 r2t
->solicit_datasn
++;
1225 hdr
->opcode
= ISCSI_OP_SCSI_DATA_OUT
;
1226 memcpy(hdr
->lun
, ctask
->hdr
->lun
, sizeof(hdr
->lun
));
1227 hdr
->itt
= ctask
->hdr
->itt
;
1228 hdr
->exp_statsn
= r2t
->exp_statsn
;
1229 new_offset
= r2t
->data_offset
+ r2t
->sent
;
1230 hdr
->offset
= cpu_to_be32(new_offset
);
1231 if (left
> conn
->max_xmit_dlength
) {
1232 hton24(hdr
->dlength
, conn
->max_xmit_dlength
);
1233 r2t
->data_count
= conn
->max_xmit_dlength
;
1235 hton24(hdr
->dlength
, left
);
1236 r2t
->data_count
= left
;
1237 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
1239 conn
->dataout_pdus_cnt
++;
1241 iscsi_buf_init_iov(&r2t
->headbuf
, (char*)hdr
,
1242 sizeof(struct iscsi_hdr
));
1244 if (iscsi_buf_left(&r2t
->sendbuf
))
1247 iscsi_buf_init_sg(&r2t
->sendbuf
, r2t
->sg
);
1251 static void iscsi_set_padding(struct iscsi_tcp_cmd_task
*tcp_ctask
,
1254 tcp_ctask
->pad_count
= len
& (ISCSI_PAD_LEN
- 1);
1255 if (!tcp_ctask
->pad_count
)
1258 tcp_ctask
->pad_count
= ISCSI_PAD_LEN
- tcp_ctask
->pad_count
;
1259 debug_scsi("write padding %d bytes\n", tcp_ctask
->pad_count
);
1260 tcp_ctask
->xmstate
|= XMSTATE_W_PAD
;
1264 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1265 * @conn: iscsi connection
1266 * @ctask: scsi command task
1270 iscsi_tcp_cmd_init(struct iscsi_cmd_task
*ctask
)
1272 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1274 BUG_ON(__kfifo_len(tcp_ctask
->r2tqueue
));
1275 tcp_ctask
->xmstate
= XMSTATE_CMD_HDR_INIT
;
1279 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
1280 * @conn: iscsi connection
1281 * @mtask: task management task
1284 * The function can return -EAGAIN in which case caller must
1285 * call it again later, or recover. '0' return code means successful
1288 * Management xmit state machine consists of these states:
1289 * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header
1290 * XMSTATE_IMM_HDR - PDU Header xmit in progress
1291 * XMSTATE_IMM_DATA - PDU Data xmit in progress
1292 * XMSTATE_IDLE - management PDU is done
1295 iscsi_tcp_mtask_xmit(struct iscsi_conn
*conn
, struct iscsi_mgmt_task
*mtask
)
1297 struct iscsi_tcp_mgmt_task
*tcp_mtask
= mtask
->dd_data
;
1300 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1301 conn
->id
, tcp_mtask
->xmstate
, mtask
->itt
);
1303 if (tcp_mtask
->xmstate
& XMSTATE_IMM_HDR_INIT
) {
1304 iscsi_buf_init_iov(&tcp_mtask
->headbuf
, (char*)mtask
->hdr
,
1305 sizeof(struct iscsi_hdr
));
1307 if (mtask
->data_count
) {
1308 tcp_mtask
->xmstate
|= XMSTATE_IMM_DATA
;
1309 iscsi_buf_init_iov(&tcp_mtask
->sendbuf
,
1314 if (conn
->c_stage
!= ISCSI_CONN_INITIAL_STAGE
&&
1315 conn
->stop_stage
!= STOP_CONN_RECOVER
&&
1317 iscsi_hdr_digest(conn
, &tcp_mtask
->headbuf
,
1318 (u8
*)tcp_mtask
->hdrext
);
1320 tcp_mtask
->sent
= 0;
1321 tcp_mtask
->xmstate
&= ~XMSTATE_IMM_HDR_INIT
;
1322 tcp_mtask
->xmstate
|= XMSTATE_IMM_HDR
;
1325 if (tcp_mtask
->xmstate
& XMSTATE_IMM_HDR
) {
1326 rc
= iscsi_sendhdr(conn
, &tcp_mtask
->headbuf
,
1330 tcp_mtask
->xmstate
&= ~XMSTATE_IMM_HDR
;
1333 if (tcp_mtask
->xmstate
& XMSTATE_IMM_DATA
) {
1334 BUG_ON(!mtask
->data_count
);
1335 tcp_mtask
->xmstate
&= ~XMSTATE_IMM_DATA
;
1336 /* FIXME: implement.
1337 * Virtual buffer could be spreaded across multiple pages...
1342 rc
= iscsi_sendpage(conn
, &tcp_mtask
->sendbuf
,
1343 &mtask
->data_count
, &tcp_mtask
->sent
);
1345 tcp_mtask
->xmstate
|= XMSTATE_IMM_DATA
;
1348 } while (mtask
->data_count
);
1351 BUG_ON(tcp_mtask
->xmstate
!= XMSTATE_IDLE
);
1352 if (mtask
->hdr
->itt
== RESERVED_ITT
) {
1353 struct iscsi_session
*session
= conn
->session
;
1355 spin_lock_bh(&session
->lock
);
1356 list_del(&conn
->mtask
->running
);
1357 __kfifo_put(session
->mgmtpool
.queue
, (void*)&conn
->mtask
,
1359 spin_unlock_bh(&session
->lock
);
1365 iscsi_send_cmd_hdr(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1367 struct scsi_cmnd
*sc
= ctask
->sc
;
1368 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1371 if (tcp_ctask
->xmstate
& XMSTATE_CMD_HDR_INIT
) {
1372 tcp_ctask
->sent
= 0;
1373 tcp_ctask
->sg_count
= 0;
1374 tcp_ctask
->exp_datasn
= 0;
1376 if (sc
->sc_data_direction
== DMA_TO_DEVICE
) {
1377 struct scatterlist
*sg
= scsi_sglist(sc
);
1379 iscsi_buf_init_sg(&tcp_ctask
->sendbuf
, sg
);
1380 tcp_ctask
->sg
= sg
+ 1;
1381 tcp_ctask
->bad_sg
= sg
+ scsi_sg_count(sc
);
1383 debug_scsi("cmd [itt 0x%x total %d imm_data %d "
1384 "unsol count %d, unsol offset %d]\n",
1385 ctask
->itt
, scsi_bufflen(sc
),
1386 ctask
->imm_count
, ctask
->unsol_count
,
1387 ctask
->unsol_offset
);
1390 iscsi_buf_init_iov(&tcp_ctask
->headbuf
, (char*)ctask
->hdr
,
1391 sizeof(struct iscsi_hdr
));
1393 if (conn
->hdrdgst_en
)
1394 iscsi_hdr_digest(conn
, &tcp_ctask
->headbuf
,
1395 (u8
*)tcp_ctask
->hdrext
);
1396 tcp_ctask
->xmstate
&= ~XMSTATE_CMD_HDR_INIT
;
1397 tcp_ctask
->xmstate
|= XMSTATE_CMD_HDR_XMIT
;
1400 if (tcp_ctask
->xmstate
& XMSTATE_CMD_HDR_XMIT
) {
1401 rc
= iscsi_sendhdr(conn
, &tcp_ctask
->headbuf
, ctask
->imm_count
);
1404 tcp_ctask
->xmstate
&= ~XMSTATE_CMD_HDR_XMIT
;
1406 if (sc
->sc_data_direction
!= DMA_TO_DEVICE
)
1409 if (ctask
->imm_count
) {
1410 tcp_ctask
->xmstate
|= XMSTATE_IMM_DATA
;
1411 iscsi_set_padding(tcp_ctask
, ctask
->imm_count
);
1413 if (ctask
->conn
->datadgst_en
) {
1414 iscsi_data_digest_init(ctask
->conn
->dd_data
,
1416 tcp_ctask
->immdigest
= 0;
1420 if (ctask
->unsol_count
)
1421 tcp_ctask
->xmstate
|=
1422 XMSTATE_UNS_HDR
| XMSTATE_UNS_INIT
;
1428 iscsi_send_padding(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1430 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1431 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1434 if (tcp_ctask
->xmstate
& XMSTATE_W_PAD
) {
1435 iscsi_buf_init_iov(&tcp_ctask
->sendbuf
, (char*)&tcp_ctask
->pad
,
1436 tcp_ctask
->pad_count
);
1437 if (conn
->datadgst_en
)
1438 crypto_hash_update(&tcp_conn
->tx_hash
,
1439 &tcp_ctask
->sendbuf
.sg
,
1440 tcp_ctask
->sendbuf
.sg
.length
);
1441 } else if (!(tcp_ctask
->xmstate
& XMSTATE_W_RESEND_PAD
))
1444 tcp_ctask
->xmstate
&= ~XMSTATE_W_PAD
;
1445 tcp_ctask
->xmstate
&= ~XMSTATE_W_RESEND_PAD
;
1446 debug_scsi("sending %d pad bytes for itt 0x%x\n",
1447 tcp_ctask
->pad_count
, ctask
->itt
);
1448 rc
= iscsi_sendpage(conn
, &tcp_ctask
->sendbuf
, &tcp_ctask
->pad_count
,
1451 debug_scsi("padding send failed %d\n", rc
);
1452 tcp_ctask
->xmstate
|= XMSTATE_W_RESEND_PAD
;
1458 iscsi_send_digest(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
,
1459 struct iscsi_buf
*buf
, uint32_t *digest
)
1461 struct iscsi_tcp_cmd_task
*tcp_ctask
;
1462 struct iscsi_tcp_conn
*tcp_conn
;
1465 if (!conn
->datadgst_en
)
1468 tcp_ctask
= ctask
->dd_data
;
1469 tcp_conn
= conn
->dd_data
;
1471 if (!(tcp_ctask
->xmstate
& XMSTATE_W_RESEND_DATA_DIGEST
)) {
1472 crypto_hash_final(&tcp_conn
->tx_hash
, (u8
*)digest
);
1473 iscsi_buf_init_iov(buf
, (char*)digest
, 4);
1475 tcp_ctask
->xmstate
&= ~XMSTATE_W_RESEND_DATA_DIGEST
;
1477 rc
= iscsi_sendpage(conn
, buf
, &tcp_ctask
->digest_count
, &sent
);
1479 debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest
,
1482 debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
1483 *digest
, ctask
->itt
);
1484 tcp_ctask
->xmstate
|= XMSTATE_W_RESEND_DATA_DIGEST
;
1490 iscsi_send_data(struct iscsi_cmd_task
*ctask
, struct iscsi_buf
*sendbuf
,
1491 struct scatterlist
**sg
, int *sent
, int *count
,
1492 struct iscsi_buf
*digestbuf
, uint32_t *digest
)
1494 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1495 struct iscsi_conn
*conn
= ctask
->conn
;
1496 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1497 int rc
, buf_sent
, offset
;
1501 offset
= sendbuf
->sent
;
1503 rc
= iscsi_sendpage(conn
, sendbuf
, count
, &buf_sent
);
1504 *sent
= *sent
+ buf_sent
;
1505 if (buf_sent
&& conn
->datadgst_en
)
1506 partial_sg_digest_update(&tcp_conn
->tx_hash
,
1507 &sendbuf
->sg
, sendbuf
->sg
.offset
+ offset
,
1509 if (!iscsi_buf_left(sendbuf
) && *sg
!= tcp_ctask
->bad_sg
) {
1510 iscsi_buf_init_sg(sendbuf
, *sg
);
1518 rc
= iscsi_send_padding(conn
, ctask
);
1522 return iscsi_send_digest(conn
, ctask
, digestbuf
, digest
);
1526 iscsi_send_unsol_hdr(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1528 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1529 struct iscsi_data_task
*dtask
;
1532 tcp_ctask
->xmstate
|= XMSTATE_UNS_DATA
;
1533 if (tcp_ctask
->xmstate
& XMSTATE_UNS_INIT
) {
1534 dtask
= &tcp_ctask
->unsol_dtask
;
1536 iscsi_prep_unsolicit_data_pdu(ctask
, &dtask
->hdr
);
1537 iscsi_buf_init_iov(&tcp_ctask
->headbuf
, (char*)&dtask
->hdr
,
1538 sizeof(struct iscsi_hdr
));
1539 if (conn
->hdrdgst_en
)
1540 iscsi_hdr_digest(conn
, &tcp_ctask
->headbuf
,
1541 (u8
*)dtask
->hdrext
);
1543 tcp_ctask
->xmstate
&= ~XMSTATE_UNS_INIT
;
1544 iscsi_set_padding(tcp_ctask
, ctask
->data_count
);
1547 rc
= iscsi_sendhdr(conn
, &tcp_ctask
->headbuf
, ctask
->data_count
);
1549 tcp_ctask
->xmstate
&= ~XMSTATE_UNS_DATA
;
1550 tcp_ctask
->xmstate
|= XMSTATE_UNS_HDR
;
1554 if (conn
->datadgst_en
) {
1555 dtask
= &tcp_ctask
->unsol_dtask
;
1556 iscsi_data_digest_init(ctask
->conn
->dd_data
, tcp_ctask
);
1560 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1561 ctask
->itt
, ctask
->unsol_count
, tcp_ctask
->sent
);
1566 iscsi_send_unsol_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1568 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1571 if (tcp_ctask
->xmstate
& XMSTATE_UNS_HDR
) {
1572 BUG_ON(!ctask
->unsol_count
);
1573 tcp_ctask
->xmstate
&= ~XMSTATE_UNS_HDR
;
1575 rc
= iscsi_send_unsol_hdr(conn
, ctask
);
1580 if (tcp_ctask
->xmstate
& XMSTATE_UNS_DATA
) {
1581 struct iscsi_data_task
*dtask
= &tcp_ctask
->unsol_dtask
;
1582 int start
= tcp_ctask
->sent
;
1584 rc
= iscsi_send_data(ctask
, &tcp_ctask
->sendbuf
, &tcp_ctask
->sg
,
1585 &tcp_ctask
->sent
, &ctask
->data_count
,
1586 &dtask
->digestbuf
, &dtask
->digest
);
1587 ctask
->unsol_count
-= tcp_ctask
->sent
- start
;
1590 tcp_ctask
->xmstate
&= ~XMSTATE_UNS_DATA
;
1592 * Done with the Data-Out. Next, check if we need
1593 * to send another unsolicited Data-Out.
1595 if (ctask
->unsol_count
) {
1596 debug_scsi("sending more uns\n");
1597 tcp_ctask
->xmstate
|= XMSTATE_UNS_INIT
;
1604 static int iscsi_send_sol_pdu(struct iscsi_conn
*conn
,
1605 struct iscsi_cmd_task
*ctask
)
1607 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1608 struct iscsi_session
*session
= conn
->session
;
1609 struct iscsi_r2t_info
*r2t
;
1610 struct iscsi_data_task
*dtask
;
1613 if (tcp_ctask
->xmstate
& XMSTATE_SOL_HDR_INIT
) {
1614 if (!tcp_ctask
->r2t
) {
1615 spin_lock_bh(&session
->lock
);
1616 __kfifo_get(tcp_ctask
->r2tqueue
, (void*)&tcp_ctask
->r2t
,
1618 spin_unlock_bh(&session
->lock
);
1621 r2t
= tcp_ctask
->r2t
;
1622 dtask
= &r2t
->dtask
;
1624 if (conn
->hdrdgst_en
)
1625 iscsi_hdr_digest(conn
, &r2t
->headbuf
,
1626 (u8
*)dtask
->hdrext
);
1627 tcp_ctask
->xmstate
&= ~XMSTATE_SOL_HDR_INIT
;
1628 tcp_ctask
->xmstate
|= XMSTATE_SOL_HDR
;
1631 if (tcp_ctask
->xmstate
& XMSTATE_SOL_HDR
) {
1632 r2t
= tcp_ctask
->r2t
;
1633 dtask
= &r2t
->dtask
;
1635 rc
= iscsi_sendhdr(conn
, &r2t
->headbuf
, r2t
->data_count
);
1638 tcp_ctask
->xmstate
&= ~XMSTATE_SOL_HDR
;
1639 tcp_ctask
->xmstate
|= XMSTATE_SOL_DATA
;
1641 if (conn
->datadgst_en
) {
1642 iscsi_data_digest_init(conn
->dd_data
, tcp_ctask
);
1646 iscsi_set_padding(tcp_ctask
, r2t
->data_count
);
1647 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1648 r2t
->solicit_datasn
- 1, ctask
->itt
, r2t
->data_count
,
1652 if (tcp_ctask
->xmstate
& XMSTATE_SOL_DATA
) {
1653 r2t
= tcp_ctask
->r2t
;
1654 dtask
= &r2t
->dtask
;
1656 rc
= iscsi_send_data(ctask
, &r2t
->sendbuf
, &r2t
->sg
,
1657 &r2t
->sent
, &r2t
->data_count
,
1658 &dtask
->digestbuf
, &dtask
->digest
);
1661 tcp_ctask
->xmstate
&= ~XMSTATE_SOL_DATA
;
1664 * Done with this Data-Out. Next, check if we have
1665 * to send another Data-Out for this R2T.
1667 BUG_ON(r2t
->data_length
- r2t
->sent
< 0);
1668 left
= r2t
->data_length
- r2t
->sent
;
1670 iscsi_solicit_data_cont(conn
, ctask
, r2t
, left
);
1675 * Done with this R2T. Check if there are more
1676 * outstanding R2Ts ready to be processed.
1678 spin_lock_bh(&session
->lock
);
1679 tcp_ctask
->r2t
= NULL
;
1680 __kfifo_put(tcp_ctask
->r2tpool
.queue
, (void*)&r2t
,
1682 if (__kfifo_get(tcp_ctask
->r2tqueue
, (void*)&r2t
,
1684 tcp_ctask
->r2t
= r2t
;
1685 spin_unlock_bh(&session
->lock
);
1688 spin_unlock_bh(&session
->lock
);
1694 * iscsi_tcp_ctask_xmit - xmit normal PDU task
1695 * @conn: iscsi connection
1696 * @ctask: iscsi command task
1699 * The function can return -EAGAIN in which case caller must
1700 * call it again later, or recover. '0' return code means successful
1702 * The function is devided to logical helpers (above) for the different
1705 *iscsi_send_cmd_hdr()
1706 * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate
1708 * XMSTATE_CMD_HDR_XMIT - Transmit header in progress
1711 * XMSTATE_W_PAD - Prepare and send pading
1712 * XMSTATE_W_RESEND_PAD - retry send pading
1715 * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest
1716 * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest
1718 *iscsi_send_unsol_hdr
1719 * XMSTATE_UNS_INIT - prepare un-solicit data header and digest
1720 * XMSTATE_UNS_HDR - send un-solicit header
1722 *iscsi_send_unsol_pdu
1723 * XMSTATE_UNS_DATA - send un-solicit data in progress
1726 * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize
1727 * XMSTATE_SOL_HDR - send solicit header
1728 * XMSTATE_SOL_DATA - send solicit data
1730 *iscsi_tcp_ctask_xmit
1731 * XMSTATE_IMM_DATA - xmit managment data (??)
1734 iscsi_tcp_ctask_xmit(struct iscsi_conn
*conn
, struct iscsi_cmd_task
*ctask
)
1736 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
1739 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
1740 conn
->id
, tcp_ctask
->xmstate
, ctask
->itt
);
1742 rc
= iscsi_send_cmd_hdr(conn
, ctask
);
1745 if (ctask
->sc
->sc_data_direction
!= DMA_TO_DEVICE
)
1748 if (tcp_ctask
->xmstate
& XMSTATE_IMM_DATA
) {
1749 rc
= iscsi_send_data(ctask
, &tcp_ctask
->sendbuf
, &tcp_ctask
->sg
,
1750 &tcp_ctask
->sent
, &ctask
->imm_count
,
1751 &tcp_ctask
->immbuf
, &tcp_ctask
->immdigest
);
1754 tcp_ctask
->xmstate
&= ~XMSTATE_IMM_DATA
;
1757 rc
= iscsi_send_unsol_pdu(conn
, ctask
);
1761 rc
= iscsi_send_sol_pdu(conn
, ctask
);
1768 static struct iscsi_cls_conn
*
1769 iscsi_tcp_conn_create(struct iscsi_cls_session
*cls_session
, uint32_t conn_idx
)
1771 struct iscsi_conn
*conn
;
1772 struct iscsi_cls_conn
*cls_conn
;
1773 struct iscsi_tcp_conn
*tcp_conn
;
1775 cls_conn
= iscsi_conn_setup(cls_session
, conn_idx
);
1778 conn
= cls_conn
->dd_data
;
1780 * due to strange issues with iser these are not set
1781 * in iscsi_conn_setup
1783 conn
->max_recv_dlength
= ISCSI_DEF_MAX_RECV_SEG_LEN
;
1785 tcp_conn
= kzalloc(sizeof(*tcp_conn
), GFP_KERNEL
);
1787 goto tcp_conn_alloc_fail
;
1789 conn
->dd_data
= tcp_conn
;
1790 tcp_conn
->iscsi_conn
= conn
;
1791 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
1792 /* initial operational parameters */
1793 tcp_conn
->hdr_size
= sizeof(struct iscsi_hdr
);
1795 tcp_conn
->tx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
1797 tcp_conn
->tx_hash
.flags
= 0;
1798 if (IS_ERR(tcp_conn
->tx_hash
.tfm
)) {
1799 printk(KERN_ERR
"Could not create connection due to crc32c "
1800 "loading error %ld. Make sure the crc32c module is "
1801 "built as a module or into the kernel\n",
1802 PTR_ERR(tcp_conn
->tx_hash
.tfm
));
1806 tcp_conn
->rx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
1808 tcp_conn
->rx_hash
.flags
= 0;
1809 if (IS_ERR(tcp_conn
->rx_hash
.tfm
)) {
1810 printk(KERN_ERR
"Could not create connection due to crc32c "
1811 "loading error %ld. Make sure the crc32c module is "
1812 "built as a module or into the kernel\n",
1813 PTR_ERR(tcp_conn
->rx_hash
.tfm
));
1820 crypto_free_hash(tcp_conn
->tx_hash
.tfm
);
1823 tcp_conn_alloc_fail
:
1824 iscsi_conn_teardown(cls_conn
);
1829 iscsi_tcp_release_conn(struct iscsi_conn
*conn
)
1831 struct iscsi_session
*session
= conn
->session
;
1832 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1833 struct socket
*sock
= tcp_conn
->sock
;
1838 sock_hold(sock
->sk
);
1839 iscsi_conn_restore_callbacks(tcp_conn
);
1842 spin_lock_bh(&session
->lock
);
1843 tcp_conn
->sock
= NULL
;
1844 conn
->recv_lock
= NULL
;
1845 spin_unlock_bh(&session
->lock
);
1850 iscsi_tcp_conn_destroy(struct iscsi_cls_conn
*cls_conn
)
1852 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1853 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1855 iscsi_tcp_release_conn(conn
);
1856 iscsi_conn_teardown(cls_conn
);
1858 if (tcp_conn
->tx_hash
.tfm
)
1859 crypto_free_hash(tcp_conn
->tx_hash
.tfm
);
1860 if (tcp_conn
->rx_hash
.tfm
)
1861 crypto_free_hash(tcp_conn
->rx_hash
.tfm
);
1867 iscsi_tcp_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
1869 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1870 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1872 iscsi_conn_stop(cls_conn
, flag
);
1873 iscsi_tcp_release_conn(conn
);
1874 tcp_conn
->hdr_size
= sizeof(struct iscsi_hdr
);
1877 static int iscsi_tcp_get_addr(struct iscsi_conn
*conn
, struct socket
*sock
,
1878 char *buf
, int *port
,
1879 int (*getname
)(struct socket
*, struct sockaddr
*,
1882 struct sockaddr_storage
*addr
;
1883 struct sockaddr_in6
*sin6
;
1884 struct sockaddr_in
*sin
;
1887 addr
= kmalloc(sizeof(*addr
), GFP_KERNEL
);
1891 if (getname(sock
, (struct sockaddr
*) addr
, &len
)) {
1896 switch (addr
->ss_family
) {
1898 sin
= (struct sockaddr_in
*)addr
;
1899 spin_lock_bh(&conn
->session
->lock
);
1900 sprintf(buf
, NIPQUAD_FMT
, NIPQUAD(sin
->sin_addr
.s_addr
));
1901 *port
= be16_to_cpu(sin
->sin_port
);
1902 spin_unlock_bh(&conn
->session
->lock
);
1905 sin6
= (struct sockaddr_in6
*)addr
;
1906 spin_lock_bh(&conn
->session
->lock
);
1907 sprintf(buf
, NIP6_FMT
, NIP6(sin6
->sin6_addr
));
1908 *port
= be16_to_cpu(sin6
->sin6_port
);
1909 spin_unlock_bh(&conn
->session
->lock
);
1918 iscsi_tcp_conn_bind(struct iscsi_cls_session
*cls_session
,
1919 struct iscsi_cls_conn
*cls_conn
, uint64_t transport_eph
,
1922 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
1923 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
1925 struct socket
*sock
;
1928 /* lookup for existing socket */
1929 sock
= sockfd_lookup((int)transport_eph
, &err
);
1931 printk(KERN_ERR
"iscsi_tcp: sockfd_lookup failed %d\n", err
);
1935 * copy these values now because if we drop the session
1936 * userspace may still want to query the values since we will
1937 * be using them for the reconnect
1939 err
= iscsi_tcp_get_addr(conn
, sock
, conn
->portal_address
,
1940 &conn
->portal_port
, kernel_getpeername
);
1944 err
= iscsi_tcp_get_addr(conn
, sock
, conn
->local_address
,
1945 &conn
->local_port
, kernel_getsockname
);
1949 err
= iscsi_conn_bind(cls_session
, cls_conn
, is_leading
);
1953 /* bind iSCSI connection and socket */
1954 tcp_conn
->sock
= sock
;
1956 /* setup Socket parameters */
1959 sk
->sk_sndtimeo
= 15 * HZ
; /* FIXME: make it configurable */
1960 sk
->sk_allocation
= GFP_ATOMIC
;
1962 /* FIXME: disable Nagle's algorithm */
1965 * Intercept TCP callbacks for sendfile like receive
1968 conn
->recv_lock
= &sk
->sk_callback_lock
;
1969 iscsi_conn_set_callbacks(conn
);
1970 tcp_conn
->sendpage
= tcp_conn
->sock
->ops
->sendpage
;
1972 * set receive state machine into initial state
1974 tcp_conn
->in_progress
= IN_PROGRESS_WAIT_HEADER
;
1982 /* called with host lock */
1984 iscsi_tcp_mgmt_init(struct iscsi_conn
*conn
, struct iscsi_mgmt_task
*mtask
)
1986 struct iscsi_tcp_mgmt_task
*tcp_mtask
= mtask
->dd_data
;
1987 tcp_mtask
->xmstate
= XMSTATE_IMM_HDR_INIT
;
1991 iscsi_r2tpool_alloc(struct iscsi_session
*session
)
1997 * initialize per-task: R2T pool and xmit queue
1999 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
2000 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
2001 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
2004 * pre-allocated x4 as much r2ts to handle race when
2005 * target acks DataOut faster than we data_xmit() queues
2006 * could replenish r2tqueue.
2010 if (iscsi_pool_init(&tcp_ctask
->r2tpool
, session
->max_r2t
* 4,
2011 (void***)&tcp_ctask
->r2ts
,
2012 sizeof(struct iscsi_r2t_info
))) {
2013 goto r2t_alloc_fail
;
2016 /* R2T xmit queue */
2017 tcp_ctask
->r2tqueue
= kfifo_alloc(
2018 session
->max_r2t
* 4 * sizeof(void*), GFP_KERNEL
, NULL
);
2019 if (tcp_ctask
->r2tqueue
== ERR_PTR(-ENOMEM
)) {
2020 iscsi_pool_free(&tcp_ctask
->r2tpool
,
2021 (void**)tcp_ctask
->r2ts
);
2022 goto r2t_alloc_fail
;
2029 for (i
= 0; i
< cmd_i
; i
++) {
2030 struct iscsi_cmd_task
*ctask
= session
->cmds
[i
];
2031 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
2033 kfifo_free(tcp_ctask
->r2tqueue
);
2034 iscsi_pool_free(&tcp_ctask
->r2tpool
,
2035 (void**)tcp_ctask
->r2ts
);
2041 iscsi_r2tpool_free(struct iscsi_session
*session
)
2045 for (i
= 0; i
< session
->cmds_max
; i
++) {
2046 struct iscsi_cmd_task
*ctask
= session
->cmds
[i
];
2047 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
2049 kfifo_free(tcp_ctask
->r2tqueue
);
2050 iscsi_pool_free(&tcp_ctask
->r2tpool
,
2051 (void**)tcp_ctask
->r2ts
);
2056 iscsi_conn_set_param(struct iscsi_cls_conn
*cls_conn
, enum iscsi_param param
,
2057 char *buf
, int buflen
)
2059 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2060 struct iscsi_session
*session
= conn
->session
;
2061 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
2065 case ISCSI_PARAM_HDRDGST_EN
:
2066 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
2067 tcp_conn
->hdr_size
= sizeof(struct iscsi_hdr
);
2068 if (conn
->hdrdgst_en
)
2069 tcp_conn
->hdr_size
+= sizeof(__u32
);
2071 case ISCSI_PARAM_DATADGST_EN
:
2072 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
2073 tcp_conn
->sendpage
= conn
->datadgst_en
?
2074 sock_no_sendpage
: tcp_conn
->sock
->ops
->sendpage
;
2076 case ISCSI_PARAM_MAX_R2T
:
2077 sscanf(buf
, "%d", &value
);
2078 if (session
->max_r2t
== roundup_pow_of_two(value
))
2080 iscsi_r2tpool_free(session
);
2081 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
2082 if (session
->max_r2t
& (session
->max_r2t
- 1))
2083 session
->max_r2t
= roundup_pow_of_two(session
->max_r2t
);
2084 if (iscsi_r2tpool_alloc(session
))
2088 return iscsi_set_param(cls_conn
, param
, buf
, buflen
);
2095 iscsi_tcp_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
2096 enum iscsi_param param
, char *buf
)
2098 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2102 case ISCSI_PARAM_CONN_PORT
:
2103 spin_lock_bh(&conn
->session
->lock
);
2104 len
= sprintf(buf
, "%hu\n", conn
->portal_port
);
2105 spin_unlock_bh(&conn
->session
->lock
);
2107 case ISCSI_PARAM_CONN_ADDRESS
:
2108 spin_lock_bh(&conn
->session
->lock
);
2109 len
= sprintf(buf
, "%s\n", conn
->portal_address
);
2110 spin_unlock_bh(&conn
->session
->lock
);
2113 return iscsi_conn_get_param(cls_conn
, param
, buf
);
2120 iscsi_tcp_host_get_param(struct Scsi_Host
*shost
, enum iscsi_host_param param
,
2123 struct iscsi_session
*session
= iscsi_hostdata(shost
->hostdata
);
2127 case ISCSI_HOST_PARAM_IPADDRESS
:
2128 spin_lock_bh(&session
->lock
);
2129 if (!session
->leadconn
)
2132 len
= sprintf(buf
, "%s\n",
2133 session
->leadconn
->local_address
);
2134 spin_unlock_bh(&session
->lock
);
2137 return iscsi_host_get_param(shost
, param
, buf
);
2143 iscsi_conn_get_stats(struct iscsi_cls_conn
*cls_conn
, struct iscsi_stats
*stats
)
2145 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
2146 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
2148 stats
->txdata_octets
= conn
->txdata_octets
;
2149 stats
->rxdata_octets
= conn
->rxdata_octets
;
2150 stats
->scsicmd_pdus
= conn
->scsicmd_pdus_cnt
;
2151 stats
->dataout_pdus
= conn
->dataout_pdus_cnt
;
2152 stats
->scsirsp_pdus
= conn
->scsirsp_pdus_cnt
;
2153 stats
->datain_pdus
= conn
->datain_pdus_cnt
;
2154 stats
->r2t_pdus
= conn
->r2t_pdus_cnt
;
2155 stats
->tmfcmd_pdus
= conn
->tmfcmd_pdus_cnt
;
2156 stats
->tmfrsp_pdus
= conn
->tmfrsp_pdus_cnt
;
2157 stats
->custom_length
= 3;
2158 strcpy(stats
->custom
[0].desc
, "tx_sendpage_failures");
2159 stats
->custom
[0].value
= tcp_conn
->sendpage_failures_cnt
;
2160 strcpy(stats
->custom
[1].desc
, "rx_discontiguous_hdr");
2161 stats
->custom
[1].value
= tcp_conn
->discontiguous_hdr_cnt
;
2162 strcpy(stats
->custom
[2].desc
, "eh_abort_cnt");
2163 stats
->custom
[2].value
= conn
->eh_abort_cnt
;
2166 static struct iscsi_cls_session
*
2167 iscsi_tcp_session_create(struct iscsi_transport
*iscsit
,
2168 struct scsi_transport_template
*scsit
,
2169 uint16_t cmds_max
, uint16_t qdepth
,
2170 uint32_t initial_cmdsn
, uint32_t *hostno
)
2172 struct iscsi_cls_session
*cls_session
;
2173 struct iscsi_session
*session
;
2177 cls_session
= iscsi_session_setup(iscsit
, scsit
, cmds_max
, qdepth
,
2178 sizeof(struct iscsi_tcp_cmd_task
),
2179 sizeof(struct iscsi_tcp_mgmt_task
),
2180 initial_cmdsn
, &hn
);
2185 session
= class_to_transport_session(cls_session
);
2186 for (cmd_i
= 0; cmd_i
< session
->cmds_max
; cmd_i
++) {
2187 struct iscsi_cmd_task
*ctask
= session
->cmds
[cmd_i
];
2188 struct iscsi_tcp_cmd_task
*tcp_ctask
= ctask
->dd_data
;
2190 ctask
->hdr
= &tcp_ctask
->hdr
;
2193 for (cmd_i
= 0; cmd_i
< session
->mgmtpool_max
; cmd_i
++) {
2194 struct iscsi_mgmt_task
*mtask
= session
->mgmt_cmds
[cmd_i
];
2195 struct iscsi_tcp_mgmt_task
*tcp_mtask
= mtask
->dd_data
;
2197 mtask
->hdr
= &tcp_mtask
->hdr
;
2200 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session
)))
2201 goto r2tpool_alloc_fail
;
2206 iscsi_session_teardown(cls_session
);
2210 static void iscsi_tcp_session_destroy(struct iscsi_cls_session
*cls_session
)
2212 iscsi_r2tpool_free(class_to_transport_session(cls_session
));
2213 iscsi_session_teardown(cls_session
);
2216 static int iscsi_tcp_slave_configure(struct scsi_device
*sdev
)
2218 blk_queue_bounce_limit(sdev
->request_queue
, BLK_BOUNCE_ANY
);
2219 blk_queue_dma_alignment(sdev
->request_queue
, 0);
2223 static struct scsi_host_template iscsi_sht
= {
2224 .module
= THIS_MODULE
,
2225 .name
= "iSCSI Initiator over TCP/IP",
2226 .queuecommand
= iscsi_queuecommand
,
2227 .change_queue_depth
= iscsi_change_queue_depth
,
2228 .can_queue
= ISCSI_DEF_XMIT_CMDS_MAX
- 1,
2229 .sg_tablesize
= ISCSI_SG_TABLESIZE
,
2230 .max_sectors
= 0xFFFF,
2231 .cmd_per_lun
= ISCSI_DEF_CMD_PER_LUN
,
2232 .eh_abort_handler
= iscsi_eh_abort
,
2233 .eh_host_reset_handler
= iscsi_eh_host_reset
,
2234 .use_clustering
= DISABLE_CLUSTERING
,
2235 .slave_configure
= iscsi_tcp_slave_configure
,
2236 .proc_name
= "iscsi_tcp",
2240 static struct iscsi_transport iscsi_tcp_transport
= {
2241 .owner
= THIS_MODULE
,
2243 .caps
= CAP_RECOVERY_L0
| CAP_MULTI_R2T
| CAP_HDRDGST
2245 .param_mask
= ISCSI_MAX_RECV_DLENGTH
|
2246 ISCSI_MAX_XMIT_DLENGTH
|
2249 ISCSI_INITIAL_R2T_EN
|
2254 ISCSI_PDU_INORDER_EN
|
2255 ISCSI_DATASEQ_INORDER_EN
|
2258 ISCSI_CONN_ADDRESS
|
2260 ISCSI_PERSISTENT_PORT
|
2261 ISCSI_PERSISTENT_ADDRESS
|
2262 ISCSI_TARGET_NAME
| ISCSI_TPGT
|
2263 ISCSI_USERNAME
| ISCSI_PASSWORD
|
2264 ISCSI_USERNAME_IN
| ISCSI_PASSWORD_IN
,
2265 .host_param_mask
= ISCSI_HOST_HWADDRESS
| ISCSI_HOST_IPADDRESS
|
2266 ISCSI_HOST_INITIATOR_NAME
|
2267 ISCSI_HOST_NETDEV_NAME
,
2268 .host_template
= &iscsi_sht
,
2269 .conndata_size
= sizeof(struct iscsi_conn
),
2271 .max_cmd_len
= ISCSI_TCP_MAX_CMD_LEN
,
2272 /* session management */
2273 .create_session
= iscsi_tcp_session_create
,
2274 .destroy_session
= iscsi_tcp_session_destroy
,
2275 /* connection management */
2276 .create_conn
= iscsi_tcp_conn_create
,
2277 .bind_conn
= iscsi_tcp_conn_bind
,
2278 .destroy_conn
= iscsi_tcp_conn_destroy
,
2279 .set_param
= iscsi_conn_set_param
,
2280 .get_conn_param
= iscsi_tcp_conn_get_param
,
2281 .get_session_param
= iscsi_session_get_param
,
2282 .start_conn
= iscsi_conn_start
,
2283 .stop_conn
= iscsi_tcp_conn_stop
,
2284 /* iscsi host params */
2285 .get_host_param
= iscsi_tcp_host_get_param
,
2286 .set_host_param
= iscsi_host_set_param
,
2288 .send_pdu
= iscsi_conn_send_pdu
,
2289 .get_stats
= iscsi_conn_get_stats
,
2290 .init_cmd_task
= iscsi_tcp_cmd_init
,
2291 .init_mgmt_task
= iscsi_tcp_mgmt_init
,
2292 .xmit_cmd_task
= iscsi_tcp_ctask_xmit
,
2293 .xmit_mgmt_task
= iscsi_tcp_mtask_xmit
,
2294 .cleanup_cmd_task
= iscsi_tcp_cleanup_ctask
,
2296 .session_recovery_timedout
= iscsi_session_recovery_timedout
,
2300 iscsi_tcp_init(void)
2302 if (iscsi_max_lun
< 1) {
2303 printk(KERN_ERR
"iscsi_tcp: Invalid max_lun value of %u\n",
2307 iscsi_tcp_transport
.max_lun
= iscsi_max_lun
;
2309 if (!iscsi_register_transport(&iscsi_tcp_transport
))
2316 iscsi_tcp_exit(void)
2318 iscsi_unregister_transport(&iscsi_tcp_transport
);
2321 module_init(iscsi_tcp_init
);
2322 module_exit(iscsi_tcp_exit
);