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/blkdev.h>
33 #include <linux/crypto.h>
34 #include <linux/delay.h>
35 #include <linux/kfifo.h>
36 #include <linux/scatterlist.h>
37 #include <linux/mutex.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_transport_iscsi.h>
44 #include "iscsi_tcp.h"
46 MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
47 "Alex Aizman <itn780@yahoo.com>");
48 MODULE_DESCRIPTION("iSCSI/TCP data-path");
49 MODULE_LICENSE("GPL");
50 /* #define DEBUG_TCP */
54 #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
56 #define debug_tcp(fmt...)
66 static unsigned int iscsi_max_lun = 512;
67 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
70 iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
72 ibuf->sg.page = virt_to_page(vbuf);
73 ibuf->sg.offset = offset_in_page(vbuf);
74 ibuf->sg.length = size;
76 ibuf->use_sendmsg = 1;
80 iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
82 ibuf->sg.page = sg->page;
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))
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 = tcp_conn->hdr_size;
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)
215 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
216 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
217 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
218 struct iscsi_session *session = conn->session;
219 struct scsi_cmnd *sc = ctask->sc;
220 int datasn = be32_to_cpu(rhdr->datasn);
222 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
226 * setup Data-In byte counter (gets decremented..)
228 ctask->data_count = tcp_conn->in.datalen;
230 if (tcp_conn->in.datalen == 0)
233 if (tcp_ctask->exp_datasn != datasn) {
234 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n",
235 __FUNCTION__, tcp_ctask->exp_datasn, datasn);
236 return ISCSI_ERR_DATASN;
239 tcp_ctask->exp_datasn++;
241 tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
242 if (tcp_ctask->data_offset + tcp_conn->in.datalen > sc->request_bufflen) {
243 debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
244 __FUNCTION__, tcp_ctask->data_offset,
245 tcp_conn->in.datalen, sc->request_bufflen);
246 return ISCSI_ERR_DATA_OFFSET;
249 if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
250 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
251 if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
252 int res_count = be32_to_cpu(rhdr->residual_count);
255 res_count <= sc->request_bufflen) {
256 sc->resid = res_count;
257 sc->result = (DID_OK << 16) | rhdr->cmd_status;
259 sc->result = (DID_BAD_TARGET << 16) |
261 } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
262 sc->resid = be32_to_cpu(rhdr->residual_count);
263 sc->result = (DID_OK << 16) | rhdr->cmd_status;
265 sc->result = (DID_OK << 16) | rhdr->cmd_status;
268 conn->datain_pdus_cnt++;
273 * iscsi_solicit_data_init - initialize first Data-Out
274 * @conn: iscsi connection
275 * @ctask: scsi command task
279 * Initialize first Data-Out within this R2T sequence and finds
280 * proper data_offset within this SCSI command.
282 * This function is called with connection lock taken.
285 iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
286 struct iscsi_r2t_info *r2t)
288 struct iscsi_data *hdr;
289 struct scsi_cmnd *sc = ctask->sc;
291 hdr = &r2t->dtask.hdr;
292 memset(hdr, 0, sizeof(struct iscsi_data));
294 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
295 r2t->solicit_datasn++;
296 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
297 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
298 hdr->itt = ctask->hdr->itt;
299 hdr->exp_statsn = r2t->exp_statsn;
300 hdr->offset = cpu_to_be32(r2t->data_offset);
301 if (r2t->data_length > conn->max_xmit_dlength) {
302 hton24(hdr->dlength, conn->max_xmit_dlength);
303 r2t->data_count = conn->max_xmit_dlength;
306 hton24(hdr->dlength, r2t->data_length);
307 r2t->data_count = r2t->data_length;
308 hdr->flags = ISCSI_FLAG_CMD_FINAL;
310 conn->dataout_pdus_cnt++;
314 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
315 sizeof(struct iscsi_hdr));
319 struct scatterlist *sg = sc->request_buffer;
322 for (i = 0; i < sc->use_sg; i++, sg += 1) {
323 /* FIXME: prefetch ? */
324 if (sg_count + sg->length > r2t->data_offset) {
329 /* offset within this page */
330 page_offset = r2t->data_offset - sg_count;
332 /* fill in this buffer */
333 iscsi_buf_init_sg(&r2t->sendbuf, sg);
334 r2t->sendbuf.sg.offset += page_offset;
335 r2t->sendbuf.sg.length -= page_offset;
337 /* xmit logic will continue with next one */
341 sg_count += sg->length;
343 BUG_ON(r2t->sg == NULL);
345 iscsi_buf_init_iov(&r2t->sendbuf,
346 (char*)sc->request_buffer + r2t->data_offset,
353 * iscsi_r2t_rsp - iSCSI R2T Response processing
354 * @conn: iscsi connection
355 * @ctask: scsi command task
358 iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
360 struct iscsi_r2t_info *r2t;
361 struct iscsi_session *session = conn->session;
362 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
363 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
364 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
365 int r2tsn = be32_to_cpu(rhdr->r2tsn);
368 if (tcp_conn->in.datalen) {
369 printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n",
370 tcp_conn->in.datalen);
371 return ISCSI_ERR_DATALEN;
374 if (tcp_ctask->exp_datasn != r2tsn){
375 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
376 __FUNCTION__, tcp_ctask->exp_datasn, r2tsn);
377 return ISCSI_ERR_R2TSN;
380 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
384 /* fill-in new R2T associated with the task */
385 spin_lock(&session->lock);
386 if (!ctask->sc || ctask->mtask ||
387 session->state != ISCSI_STATE_LOGGED_IN) {
388 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
389 "recovery...\n", ctask->itt);
390 spin_unlock(&session->lock);
394 rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
397 r2t->exp_statsn = rhdr->statsn;
398 r2t->data_length = be32_to_cpu(rhdr->data_length);
399 if (r2t->data_length == 0) {
400 printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
401 spin_unlock(&session->lock);
402 return ISCSI_ERR_DATALEN;
405 if (r2t->data_length > session->max_burst)
406 debug_scsi("invalid R2T with data len %u and max burst %u."
407 "Attempting to execute request.\n",
408 r2t->data_length, session->max_burst);
410 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
411 if (r2t->data_offset + r2t->data_length > ctask->sc->request_bufflen) {
412 spin_unlock(&session->lock);
413 printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
414 "offset %u and total length %d\n", r2t->data_length,
415 r2t->data_offset, ctask->sc->request_bufflen);
416 return ISCSI_ERR_DATALEN;
419 r2t->ttt = rhdr->ttt; /* no flip */
420 r2t->solicit_datasn = 0;
422 iscsi_solicit_data_init(conn, ctask, r2t);
424 tcp_ctask->exp_datasn = r2tsn + 1;
425 __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
426 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
427 list_move_tail(&ctask->running, &conn->xmitqueue);
429 scsi_queue_work(session->host, &conn->xmitwork);
430 conn->r2t_pdus_cnt++;
431 spin_unlock(&session->lock);
437 iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
439 int rc = 0, opcode, ahslen;
440 struct iscsi_hdr *hdr;
441 struct iscsi_session *session = conn->session;
442 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
443 uint32_t cdgst, rdgst = 0, itt;
445 hdr = tcp_conn->in.hdr;
447 /* verify PDU length */
448 tcp_conn->in.datalen = ntoh24(hdr->dlength);
449 if (tcp_conn->in.datalen > conn->max_recv_dlength) {
450 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
451 tcp_conn->in.datalen, conn->max_recv_dlength);
452 return ISCSI_ERR_DATALEN;
454 tcp_conn->data_copied = 0;
457 ahslen = hdr->hlength << 2;
458 tcp_conn->in.offset += ahslen;
459 tcp_conn->in.copy -= ahslen;
460 if (tcp_conn->in.copy < 0) {
461 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
462 "%d bytes\n", ahslen);
463 return ISCSI_ERR_AHSLEN;
466 /* calculate read padding */
467 tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
468 if (tcp_conn->in.padding) {
469 tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
470 debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
473 if (conn->hdrdgst_en) {
474 struct scatterlist sg;
476 sg_init_one(&sg, (u8 *)hdr,
477 sizeof(struct iscsi_hdr) + ahslen);
478 crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length,
480 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
482 if (cdgst != rdgst) {
483 printk(KERN_ERR "iscsi_tcp: hdrdgst error "
484 "recv 0x%x calc 0x%x\n", rdgst, cdgst);
485 return ISCSI_ERR_HDR_DGST;
489 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
490 /* verify itt (itt encoding: age+cid+itt) */
491 rc = iscsi_verify_itt(conn, hdr, &itt);
492 if (rc == ISCSI_ERR_NO_SCSI_CMD) {
493 tcp_conn->in.datalen = 0; /* force drop */
498 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
499 opcode, tcp_conn->in.offset, tcp_conn->in.copy,
500 ahslen, tcp_conn->in.datalen);
503 case ISCSI_OP_SCSI_DATA_IN:
504 tcp_conn->in.ctask = session->cmds[itt];
505 rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
509 case ISCSI_OP_SCSI_CMD_RSP:
510 tcp_conn->in.ctask = session->cmds[itt];
511 if (tcp_conn->in.datalen)
514 spin_lock(&session->lock);
515 rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
516 spin_unlock(&session->lock);
519 tcp_conn->in.ctask = session->cmds[itt];
521 rc = ISCSI_ERR_AHSLEN;
522 else if (tcp_conn->in.ctask->sc->sc_data_direction ==
524 rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
526 rc = ISCSI_ERR_PROTO;
528 case ISCSI_OP_LOGIN_RSP:
529 case ISCSI_OP_TEXT_RSP:
530 case ISCSI_OP_REJECT:
531 case ISCSI_OP_ASYNC_EVENT:
533 * It is possible that we could get a PDU with a buffer larger
534 * than 8K, but there are no targets that currently do this.
535 * For now we fail until we find a vendor that needs it
537 if (ISCSI_DEF_MAX_RECV_SEG_LEN <
538 tcp_conn->in.datalen) {
539 printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
540 "but conn buffer is only %u (opcode %0x)\n",
541 tcp_conn->in.datalen,
542 ISCSI_DEF_MAX_RECV_SEG_LEN, opcode);
543 rc = ISCSI_ERR_PROTO;
547 if (tcp_conn->in.datalen)
550 case ISCSI_OP_LOGOUT_RSP:
551 case ISCSI_OP_NOOP_IN:
552 case ISCSI_OP_SCSI_TMFUNC_RSP:
553 rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
556 rc = ISCSI_ERR_BAD_OPCODE;
564 * if we did zero copy for the header but we will need multiple
565 * skbs to complete the command then we have to copy the header
568 if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
569 (tcp_conn->in.datalen + tcp_conn->in.padding +
570 (conn->datadgst_en ? 4 : 0))) {
571 debug_tcp("Copying header for later use. in.copy %d in.datalen"
572 " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
573 memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
574 sizeof(struct iscsi_hdr));
575 tcp_conn->in.hdr = &tcp_conn->hdr;
576 tcp_conn->in.zero_copy_hdr = 0;
582 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
583 * @conn: iscsi tcp connection
584 * @ctask: scsi command task
585 * @buf: buffer to copy to
586 * @buf_size: size of buffer
587 * @offset: offset within the buffer
590 * The function calls skb_copy_bits() and updates per-connection and
591 * per-cmd byte counters.
593 * Read counters (in bytes):
595 * conn->in.offset offset within in progress SKB
596 * conn->in.copy left to copy from in progress SKB
598 * conn->in.copied copied already from in progress SKB
599 * conn->data_copied copied already from in progress buffer
600 * ctask->sent total bytes sent up to the MidLayer
601 * ctask->data_count left to copy from in progress Data-In
602 * buf_left left to copy from in progress buffer
605 iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
606 void *buf, int buf_size, int offset)
608 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
609 int buf_left = buf_size - (tcp_conn->data_copied + offset);
610 unsigned size = min(tcp_conn->in.copy, buf_left);
613 size = min(size, ctask->data_count);
615 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
616 size, tcp_conn->in.offset, tcp_conn->in.copied);
619 BUG_ON(tcp_ctask->sent + size > ctask->sc->request_bufflen);
621 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
622 (char*)buf + (offset + tcp_conn->data_copied), size);
623 /* must fit into skb->len */
626 tcp_conn->in.offset += size;
627 tcp_conn->in.copy -= size;
628 tcp_conn->in.copied += size;
629 tcp_conn->data_copied += size;
630 tcp_ctask->sent += size;
631 ctask->data_count -= size;
633 BUG_ON(tcp_conn->in.copy < 0);
634 BUG_ON(ctask->data_count < 0);
636 if (buf_size != (tcp_conn->data_copied + offset)) {
637 if (!ctask->data_count) {
638 BUG_ON(buf_size - tcp_conn->data_copied < 0);
639 /* done with this PDU */
640 return buf_size - tcp_conn->data_copied;
645 /* done with this buffer or with both - PDU and buffer */
646 tcp_conn->data_copied = 0;
651 * iscsi_tcp_copy - copy skb bits to the destanation buffer
652 * @conn: iscsi tcp connection
655 * The function calls skb_copy_bits() and updates per-connection
659 iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size)
661 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
662 int buf_left = buf_size - tcp_conn->data_copied;
663 int size = min(tcp_conn->in.copy, buf_left);
666 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
667 size, tcp_conn->in.offset, tcp_conn->data_copied);
670 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
671 (char*)conn->data + tcp_conn->data_copied, size);
674 tcp_conn->in.offset += size;
675 tcp_conn->in.copy -= size;
676 tcp_conn->in.copied += size;
677 tcp_conn->data_copied += size;
679 if (buf_size != tcp_conn->data_copied)
686 partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg,
687 int offset, int length)
689 struct scatterlist temp;
691 memcpy(&temp, sg, sizeof(struct scatterlist));
692 temp.offset = offset;
693 temp.length = length;
694 crypto_hash_update(desc, &temp, length);
698 iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
700 struct scatterlist tmp;
702 sg_init_one(&tmp, buf, len);
703 crypto_hash_update(&tcp_conn->rx_hash, &tmp, len);
706 static int iscsi_scsi_data_in(struct iscsi_conn *conn)
708 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
709 struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
710 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
711 struct scsi_cmnd *sc = ctask->sc;
712 struct scatterlist *sg;
713 int i, offset, rc = 0;
715 BUG_ON((void*)ctask != sc->SCp.ptr);
718 * copying Data-In into the Scsi_Cmnd
721 i = ctask->data_count;
722 rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
724 tcp_ctask->data_offset);
727 if (conn->datadgst_en)
728 iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
734 offset = tcp_ctask->data_offset;
735 sg = sc->request_buffer;
737 if (tcp_ctask->data_offset)
738 for (i = 0; i < tcp_ctask->sg_count; i++)
739 offset -= sg[i].length;
740 /* we've passed through partial sg*/
744 for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
747 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
748 rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
749 sg[i].length, offset);
750 kunmap_atomic(dest, KM_SOFTIRQ0);
752 /* continue with the next SKB/PDU */
755 if (conn->datadgst_en) {
759 &sg[i], sg[i].length);
761 partial_sg_digest_update(
764 sg[i].offset + offset,
765 sg[i].length - offset);
768 tcp_ctask->sg_count++;
771 if (!ctask->data_count) {
772 if (rc && conn->datadgst_en)
774 * data-in is complete, but buffer not...
776 partial_sg_digest_update(&tcp_conn->rx_hash,
784 if (!tcp_conn->in.copy)
787 BUG_ON(ctask->data_count);
790 /* check for non-exceptional status */
791 if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
792 debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
793 (long)sc, sc->result, ctask->itt,
794 tcp_conn->in.hdr->flags);
795 spin_lock(&conn->session->lock);
796 __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
797 spin_unlock(&conn->session->lock);
804 iscsi_data_recv(struct iscsi_conn *conn)
806 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
809 opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
811 case ISCSI_OP_SCSI_DATA_IN:
812 rc = iscsi_scsi_data_in(conn);
814 case ISCSI_OP_SCSI_CMD_RSP:
815 case ISCSI_OP_TEXT_RSP:
816 case ISCSI_OP_LOGIN_RSP:
817 case ISCSI_OP_ASYNC_EVENT:
818 case ISCSI_OP_REJECT:
820 * Collect data segment to the connection's data
823 if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) {
828 rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
829 tcp_conn->in.datalen);
830 if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
831 iscsi_recv_digest_update(tcp_conn, conn->data,
832 tcp_conn->in.datalen);
842 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
843 * @rd_desc: read descriptor
844 * @skb: socket buffer
845 * @offset: offset in skb
846 * @len: skb->len - offset
849 iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
850 unsigned int offset, size_t len)
853 struct iscsi_conn *conn = rd_desc->arg.data;
854 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
856 char pad[ISCSI_PAD_LEN];
857 struct scatterlist sg;
860 * Save current SKB and its offset in the corresponding
861 * connection context.
863 tcp_conn->in.copy = skb->len - offset;
864 tcp_conn->in.offset = offset;
865 tcp_conn->in.skb = skb;
866 tcp_conn->in.len = tcp_conn->in.copy;
867 BUG_ON(tcp_conn->in.copy <= 0);
868 debug_tcp("in %d bytes\n", tcp_conn->in.copy);
871 tcp_conn->in.copied = 0;
874 if (unlikely(conn->suspend_rx)) {
875 debug_tcp("conn %d Rx suspended!\n", conn->id);
879 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
880 tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
881 rc = iscsi_hdr_extract(tcp_conn);
886 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
892 * Verify and process incoming PDU header.
894 rc = iscsi_tcp_hdr_recv(conn);
895 if (!rc && tcp_conn->in.datalen) {
896 if (conn->datadgst_en)
897 crypto_hash_init(&tcp_conn->rx_hash);
898 tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
900 iscsi_conn_failure(conn, rc);
905 if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
906 uint32_t recv_digest;
908 debug_tcp("extra data_recv offset %d copy %d\n",
909 tcp_conn->in.offset, tcp_conn->in.copy);
910 rc = iscsi_tcp_copy(conn, sizeof(uint32_t));
914 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
918 memcpy(&recv_digest, conn->data, sizeof(uint32_t));
919 if (recv_digest != tcp_conn->in.datadgst) {
920 debug_tcp("iscsi_tcp: data digest error!"
921 "0x%x != 0x%x\n", recv_digest,
922 tcp_conn->in.datadgst);
923 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
926 debug_tcp("iscsi_tcp: data digest match!"
927 "0x%x == 0x%x\n", recv_digest,
928 tcp_conn->in.datadgst);
929 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
933 if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
936 debug_tcp("data_recv offset %d copy %d\n",
937 tcp_conn->in.offset, tcp_conn->in.copy);
939 rc = iscsi_data_recv(conn);
943 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
946 tcp_conn->in.copy -= tcp_conn->in.padding;
947 tcp_conn->in.offset += tcp_conn->in.padding;
948 if (conn->datadgst_en) {
949 if (tcp_conn->in.padding) {
950 debug_tcp("padding -> %d\n",
951 tcp_conn->in.padding);
952 memset(pad, 0, tcp_conn->in.padding);
953 sg_init_one(&sg, pad, tcp_conn->in.padding);
954 crypto_hash_update(&tcp_conn->rx_hash,
957 crypto_hash_final(&tcp_conn->rx_hash,
958 (u8 *) &tcp_conn->in.datadgst);
959 debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
960 tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
961 tcp_conn->data_copied = 0;
963 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
966 debug_tcp("f, processed %d from out of %d padding %d\n",
967 tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
968 BUG_ON(tcp_conn->in.offset - offset > len);
970 if (tcp_conn->in.offset - offset != len) {
971 debug_tcp("continue to process %d bytes\n",
972 (int)len - (tcp_conn->in.offset - offset));
977 processed = tcp_conn->in.offset - offset;
978 BUG_ON(processed == 0);
982 processed = tcp_conn->in.offset - offset;
983 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
984 processed, (int)len, (int)rd_desc->count);
985 BUG_ON(processed == 0);
986 BUG_ON(processed > len);
988 conn->rxdata_octets += processed;
993 iscsi_tcp_data_ready(struct sock *sk, int flag)
995 struct iscsi_conn *conn = sk->sk_user_data;
996 read_descriptor_t rd_desc;
998 read_lock(&sk->sk_callback_lock);
1001 * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
1002 * We set count to 1 because we want the network layer to
1003 * hand us all the skbs that are available. iscsi_tcp_data_recv
1004 * handled pdus that cross buffers or pdus that still need data.
1006 rd_desc.arg.data = conn;
1008 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
1010 read_unlock(&sk->sk_callback_lock);
1014 iscsi_tcp_state_change(struct sock *sk)
1016 struct iscsi_tcp_conn *tcp_conn;
1017 struct iscsi_conn *conn;
1018 struct iscsi_session *session;
1019 void (*old_state_change)(struct sock *);
1021 read_lock(&sk->sk_callback_lock);
1023 conn = (struct iscsi_conn*)sk->sk_user_data;
1024 session = conn->session;
1026 if ((sk->sk_state == TCP_CLOSE_WAIT ||
1027 sk->sk_state == TCP_CLOSE) &&
1028 !atomic_read(&sk->sk_rmem_alloc)) {
1029 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1030 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1033 tcp_conn = conn->dd_data;
1034 old_state_change = tcp_conn->old_state_change;
1036 read_unlock(&sk->sk_callback_lock);
1038 old_state_change(sk);
1042 * iscsi_write_space - Called when more output buffer space is available
1043 * @sk: socket space is available for
1046 iscsi_write_space(struct sock *sk)
1048 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1049 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1051 tcp_conn->old_write_space(sk);
1052 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1053 scsi_queue_work(conn->session->host, &conn->xmitwork);
1057 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1059 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1060 struct sock *sk = tcp_conn->sock->sk;
1062 /* assign new callbacks */
1063 write_lock_bh(&sk->sk_callback_lock);
1064 sk->sk_user_data = conn;
1065 tcp_conn->old_data_ready = sk->sk_data_ready;
1066 tcp_conn->old_state_change = sk->sk_state_change;
1067 tcp_conn->old_write_space = sk->sk_write_space;
1068 sk->sk_data_ready = iscsi_tcp_data_ready;
1069 sk->sk_state_change = iscsi_tcp_state_change;
1070 sk->sk_write_space = iscsi_write_space;
1071 write_unlock_bh(&sk->sk_callback_lock);
1075 iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
1077 struct sock *sk = tcp_conn->sock->sk;
1079 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1080 write_lock_bh(&sk->sk_callback_lock);
1081 sk->sk_user_data = NULL;
1082 sk->sk_data_ready = tcp_conn->old_data_ready;
1083 sk->sk_state_change = tcp_conn->old_state_change;
1084 sk->sk_write_space = tcp_conn->old_write_space;
1085 sk->sk_no_check = 0;
1086 write_unlock_bh(&sk->sk_callback_lock);
1090 * iscsi_send - generic send routine
1091 * @sk: kernel's socket
1092 * @buf: buffer to write from
1093 * @size: actual size to write
1094 * @flags: socket's flags
1097 iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
1099 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1100 struct socket *sk = tcp_conn->sock;
1101 int offset = buf->sg.offset + buf->sent, res;
1104 * if we got use_sg=0 or are sending something we kmallocd
1105 * then we did not have to do kmap (kmap returns page_address)
1107 * if we got use_sg > 0, but had to drop down, we do not
1108 * set clustering so this should only happen for that
1111 if (buf->use_sendmsg)
1112 res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
1114 res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
1117 conn->txdata_octets += res;
1122 tcp_conn->sendpage_failures_cnt++;
1126 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1131 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1132 * @conn: iscsi connection
1133 * @buf: buffer to write from
1134 * @datalen: lenght of data to be sent after the header
1140 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1142 int flags = 0; /* MSG_DONTWAIT; */
1145 size = buf->sg.length - buf->sent;
1146 BUG_ON(buf->sent + size > buf->sg.length);
1147 if (buf->sent + size != buf->sg.length || datalen)
1150 res = iscsi_send(conn, buf, size, flags);
1151 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1162 * iscsi_sendpage - send one page of iSCSI Data-Out.
1163 * @conn: iscsi connection
1164 * @buf: buffer to write from
1165 * @count: remaining data
1166 * @sent: number of bytes sent
1172 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1173 int *count, int *sent)
1175 int flags = 0; /* MSG_DONTWAIT; */
1178 size = buf->sg.length - buf->sent;
1179 BUG_ON(buf->sent + size > buf->sg.length);
1182 if (buf->sent + size != buf->sg.length || *count != size)
1185 res = iscsi_send(conn, buf, size, flags);
1186 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1187 size, buf->sent, *count, *sent, res);
1200 iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
1201 struct iscsi_tcp_cmd_task *tcp_ctask)
1203 crypto_hash_init(&tcp_conn->tx_hash);
1204 tcp_ctask->digest_count = 4;
1208 * iscsi_solicit_data_cont - initialize next Data-Out
1209 * @conn: iscsi connection
1210 * @ctask: scsi command task
1212 * @left: bytes left to transfer
1215 * Initialize next Data-Out within this R2T sequence and continue
1216 * to process next Scatter-Gather element(if any) of this SCSI command.
1218 * Called under connection lock.
1221 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1222 struct iscsi_r2t_info *r2t, int left)
1224 struct iscsi_data *hdr;
1225 struct scsi_cmnd *sc = ctask->sc;
1228 hdr = &r2t->dtask.hdr;
1229 memset(hdr, 0, sizeof(struct iscsi_data));
1230 hdr->ttt = r2t->ttt;
1231 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1232 r2t->solicit_datasn++;
1233 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1234 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1235 hdr->itt = ctask->hdr->itt;
1236 hdr->exp_statsn = r2t->exp_statsn;
1237 new_offset = r2t->data_offset + r2t->sent;
1238 hdr->offset = cpu_to_be32(new_offset);
1239 if (left > conn->max_xmit_dlength) {
1240 hton24(hdr->dlength, conn->max_xmit_dlength);
1241 r2t->data_count = conn->max_xmit_dlength;
1243 hton24(hdr->dlength, left);
1244 r2t->data_count = left;
1245 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1247 conn->dataout_pdus_cnt++;
1249 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
1250 sizeof(struct iscsi_hdr));
1252 if (iscsi_buf_left(&r2t->sendbuf))
1256 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1259 iscsi_buf_init_iov(&r2t->sendbuf,
1260 (char*)sc->request_buffer + new_offset,
1266 static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
1269 tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
1270 if (!tcp_ctask->pad_count)
1273 tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
1274 debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
1275 tcp_ctask->xmstate |= XMSTATE_W_PAD;
1279 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1280 * @conn: iscsi connection
1281 * @ctask: scsi command task
1285 iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
1287 struct scsi_cmnd *sc = ctask->sc;
1288 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1290 BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
1292 tcp_ctask->sent = 0;
1293 tcp_ctask->sg_count = 0;
1294 tcp_ctask->exp_datasn = 0;
1296 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1297 tcp_ctask->xmstate = XMSTATE_W_HDR;
1298 BUG_ON(sc->request_bufflen == 0);
1301 struct scatterlist *sg = sc->request_buffer;
1303 iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
1304 tcp_ctask->sg = sg + 1;
1305 tcp_ctask->bad_sg = sg + sc->use_sg;
1307 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
1309 sc->request_bufflen);
1310 tcp_ctask->sg = NULL;
1311 tcp_ctask->bad_sg = NULL;
1313 debug_scsi("cmd [itt 0x%x total %d imm_data %d "
1314 "unsol count %d, unsol offset %d]\n",
1315 ctask->itt, sc->request_bufflen, ctask->imm_count,
1316 ctask->unsol_count, ctask->unsol_offset);
1318 tcp_ctask->xmstate = XMSTATE_R_HDR;
1320 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
1321 sizeof(struct iscsi_hdr));
1325 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
1326 * @conn: iscsi connection
1327 * @mtask: task management task
1330 * The function can return -EAGAIN in which case caller must
1331 * call it again later, or recover. '0' return code means successful
1334 * Management xmit state machine consists of two states:
1335 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1336 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1339 iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1341 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1344 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1345 conn->id, tcp_mtask->xmstate, mtask->itt);
1347 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
1348 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
1349 if (mtask->data_count)
1350 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1351 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1352 conn->stop_stage != STOP_CONN_RECOVER &&
1354 iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
1355 (u8*)tcp_mtask->hdrext);
1356 rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
1359 tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
1360 if (mtask->data_count)
1361 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
1366 if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
1367 BUG_ON(!mtask->data_count);
1368 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
1369 /* FIXME: implement.
1370 * Virtual buffer could be spreaded across multiple pages...
1375 rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
1376 &mtask->data_count, &tcp_mtask->sent);
1378 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1381 } while (mtask->data_count);
1384 BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
1385 if (mtask->hdr->itt == RESERVED_ITT) {
1386 struct iscsi_session *session = conn->session;
1388 spin_lock_bh(&session->lock);
1389 list_del(&conn->mtask->running);
1390 __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
1392 spin_unlock_bh(&session->lock);
1398 iscsi_send_read_hdr(struct iscsi_conn *conn,
1399 struct iscsi_tcp_cmd_task *tcp_ctask)
1403 tcp_ctask->xmstate &= ~XMSTATE_R_HDR;
1404 if (conn->hdrdgst_en)
1405 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1406 (u8*)tcp_ctask->hdrext);
1407 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0);
1409 BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE);
1410 return 0; /* wait for Data-In */
1412 tcp_ctask->xmstate |= XMSTATE_R_HDR;
1417 iscsi_send_write_hdr(struct iscsi_conn *conn,
1418 struct iscsi_cmd_task *ctask)
1420 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1423 tcp_ctask->xmstate &= ~XMSTATE_W_HDR;
1424 if (conn->hdrdgst_en)
1425 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1426 (u8*)tcp_ctask->hdrext);
1427 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
1429 tcp_ctask->xmstate |= XMSTATE_W_HDR;
1433 if (ctask->imm_count) {
1434 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1435 iscsi_set_padding(tcp_ctask, ctask->imm_count);
1437 if (ctask->conn->datadgst_en) {
1438 iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
1439 tcp_ctask->immdigest = 0;
1443 if (ctask->unsol_count)
1444 tcp_ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
1449 iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1451 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1452 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1455 if (tcp_ctask->xmstate & XMSTATE_W_PAD) {
1456 iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
1457 tcp_ctask->pad_count);
1458 if (conn->datadgst_en)
1459 crypto_hash_update(&tcp_conn->tx_hash,
1460 &tcp_ctask->sendbuf.sg,
1461 tcp_ctask->sendbuf.sg.length);
1462 } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD))
1465 tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
1466 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD;
1467 debug_scsi("sending %d pad bytes for itt 0x%x\n",
1468 tcp_ctask->pad_count, ctask->itt);
1469 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
1472 debug_scsi("padding send failed %d\n", rc);
1473 tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD;
1479 iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1480 struct iscsi_buf *buf, uint32_t *digest)
1482 struct iscsi_tcp_cmd_task *tcp_ctask;
1483 struct iscsi_tcp_conn *tcp_conn;
1486 if (!conn->datadgst_en)
1489 tcp_ctask = ctask->dd_data;
1490 tcp_conn = conn->dd_data;
1492 if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) {
1493 crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest);
1494 iscsi_buf_init_iov(buf, (char*)digest, 4);
1496 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST;
1498 rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
1500 debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest,
1503 debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
1504 *digest, ctask->itt);
1505 tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST;
1511 iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
1512 struct scatterlist **sg, int *sent, int *count,
1513 struct iscsi_buf *digestbuf, uint32_t *digest)
1515 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1516 struct iscsi_conn *conn = ctask->conn;
1517 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1518 int rc, buf_sent, offset;
1522 offset = sendbuf->sent;
1524 rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent);
1525 *sent = *sent + buf_sent;
1526 if (buf_sent && conn->datadgst_en)
1527 partial_sg_digest_update(&tcp_conn->tx_hash,
1528 &sendbuf->sg, sendbuf->sg.offset + offset,
1530 if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
1531 iscsi_buf_init_sg(sendbuf, *sg);
1539 rc = iscsi_send_padding(conn, ctask);
1543 return iscsi_send_digest(conn, ctask, digestbuf, digest);
1547 iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1549 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1550 struct iscsi_data_task *dtask;
1553 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1554 if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
1555 dtask = &tcp_ctask->unsol_dtask;
1557 iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
1558 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
1559 sizeof(struct iscsi_hdr));
1560 if (conn->hdrdgst_en)
1561 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1562 (u8*)dtask->hdrext);
1564 tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
1565 iscsi_set_padding(tcp_ctask, ctask->data_count);
1568 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
1570 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1571 tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
1575 if (conn->datadgst_en) {
1576 dtask = &tcp_ctask->unsol_dtask;
1577 iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
1581 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1582 ctask->itt, ctask->unsol_count, tcp_ctask->sent);
1587 iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1589 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1592 if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
1593 BUG_ON(!ctask->unsol_count);
1594 tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
1596 rc = iscsi_send_unsol_hdr(conn, ctask);
1601 if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
1602 struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
1603 int start = tcp_ctask->sent;
1605 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1606 &tcp_ctask->sent, &ctask->data_count,
1607 &dtask->digestbuf, &dtask->digest);
1608 ctask->unsol_count -= tcp_ctask->sent - start;
1611 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1613 * Done with the Data-Out. Next, check if we need
1614 * to send another unsolicited Data-Out.
1616 if (ctask->unsol_count) {
1617 debug_scsi("sending more uns\n");
1618 tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
1625 static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
1626 struct iscsi_cmd_task *ctask)
1628 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1629 struct iscsi_session *session = conn->session;
1630 struct iscsi_r2t_info *r2t;
1631 struct iscsi_data_task *dtask;
1634 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
1635 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1636 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1637 if (!tcp_ctask->r2t) {
1638 spin_lock_bh(&session->lock);
1639 __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
1641 spin_unlock_bh(&session->lock);
1644 r2t = tcp_ctask->r2t;
1645 dtask = &r2t->dtask;
1647 if (conn->hdrdgst_en)
1648 iscsi_hdr_digest(conn, &r2t->headbuf,
1649 (u8*)dtask->hdrext);
1650 rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
1652 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1653 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
1657 if (conn->datadgst_en) {
1658 iscsi_data_digest_init(conn->dd_data, tcp_ctask);
1662 iscsi_set_padding(tcp_ctask, r2t->data_count);
1663 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1664 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
1668 if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
1669 r2t = tcp_ctask->r2t;
1670 dtask = &r2t->dtask;
1672 rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
1673 &r2t->sent, &r2t->data_count,
1674 &dtask->digestbuf, &dtask->digest);
1677 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1680 * Done with this Data-Out. Next, check if we have
1681 * to send another Data-Out for this R2T.
1683 BUG_ON(r2t->data_length - r2t->sent < 0);
1684 left = r2t->data_length - r2t->sent;
1686 iscsi_solicit_data_cont(conn, ctask, r2t, left);
1687 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1688 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1693 * Done with this R2T. Check if there are more
1694 * outstanding R2Ts ready to be processed.
1696 spin_lock_bh(&session->lock);
1697 tcp_ctask->r2t = NULL;
1698 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
1700 if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t,
1702 tcp_ctask->r2t = r2t;
1703 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1704 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1705 spin_unlock_bh(&session->lock);
1708 spin_unlock_bh(&session->lock);
1714 iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1716 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1719 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
1720 conn->id, tcp_ctask->xmstate, ctask->itt);
1723 * serialize with TMF AbortTask
1728 if (tcp_ctask->xmstate & XMSTATE_R_HDR)
1729 return iscsi_send_read_hdr(conn, tcp_ctask);
1731 if (tcp_ctask->xmstate & XMSTATE_W_HDR) {
1732 rc = iscsi_send_write_hdr(conn, ctask);
1737 if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
1738 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1739 &tcp_ctask->sent, &ctask->imm_count,
1740 &tcp_ctask->immbuf, &tcp_ctask->immdigest);
1743 tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
1746 rc = iscsi_send_unsol_pdu(conn, ctask);
1750 rc = iscsi_send_sol_pdu(conn, ctask);
1757 static struct iscsi_cls_conn *
1758 iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1760 struct iscsi_conn *conn;
1761 struct iscsi_cls_conn *cls_conn;
1762 struct iscsi_tcp_conn *tcp_conn;
1764 cls_conn = iscsi_conn_setup(cls_session, conn_idx);
1767 conn = cls_conn->dd_data;
1769 * due to strange issues with iser these are not set
1770 * in iscsi_conn_setup
1772 conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN;
1774 tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
1776 goto tcp_conn_alloc_fail;
1778 conn->dd_data = tcp_conn;
1779 tcp_conn->iscsi_conn = conn;
1780 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1781 /* initial operational parameters */
1782 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
1784 tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1786 tcp_conn->tx_hash.flags = 0;
1787 if (IS_ERR(tcp_conn->tx_hash.tfm)) {
1788 printk(KERN_ERR "Could not create connection due to crc32c "
1789 "loading error %ld. Make sure the crc32c module is "
1790 "built as a module or into the kernel\n",
1791 PTR_ERR(tcp_conn->tx_hash.tfm));
1795 tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1797 tcp_conn->rx_hash.flags = 0;
1798 if (IS_ERR(tcp_conn->rx_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->rx_hash.tfm));
1809 crypto_free_hash(tcp_conn->tx_hash.tfm);
1812 tcp_conn_alloc_fail:
1813 iscsi_conn_teardown(cls_conn);
1818 iscsi_tcp_release_conn(struct iscsi_conn *conn)
1820 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1822 if (!tcp_conn->sock)
1825 sock_hold(tcp_conn->sock->sk);
1826 iscsi_conn_restore_callbacks(tcp_conn);
1827 sock_put(tcp_conn->sock->sk);
1829 sock_release(tcp_conn->sock);
1830 tcp_conn->sock = NULL;
1831 conn->recv_lock = NULL;
1835 iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
1837 struct iscsi_conn *conn = cls_conn->dd_data;
1838 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1840 iscsi_tcp_release_conn(conn);
1841 iscsi_conn_teardown(cls_conn);
1843 if (tcp_conn->tx_hash.tfm)
1844 crypto_free_hash(tcp_conn->tx_hash.tfm);
1845 if (tcp_conn->rx_hash.tfm)
1846 crypto_free_hash(tcp_conn->rx_hash.tfm);
1852 iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1854 struct iscsi_conn *conn = cls_conn->dd_data;
1855 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1857 iscsi_conn_stop(cls_conn, flag);
1858 iscsi_tcp_release_conn(conn);
1859 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
1863 iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
1864 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
1867 struct iscsi_conn *conn = cls_conn->dd_data;
1868 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1870 struct socket *sock;
1873 /* lookup for existing socket */
1874 sock = sockfd_lookup((int)transport_eph, &err);
1876 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
1880 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
1884 /* bind iSCSI connection and socket */
1885 tcp_conn->sock = sock;
1887 /* setup Socket parameters */
1890 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
1891 sk->sk_allocation = GFP_ATOMIC;
1893 /* FIXME: disable Nagle's algorithm */
1896 * Intercept TCP callbacks for sendfile like receive
1899 conn->recv_lock = &sk->sk_callback_lock;
1900 iscsi_conn_set_callbacks(conn);
1901 tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
1903 * set receive state machine into initial state
1905 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1910 /* called with host lock */
1912 iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask,
1913 char *data, uint32_t data_size)
1915 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1917 iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
1918 sizeof(struct iscsi_hdr));
1919 tcp_mtask->xmstate = XMSTATE_IMM_HDR;
1920 tcp_mtask->sent = 0;
1922 if (mtask->data_count)
1923 iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data,
1928 iscsi_r2tpool_alloc(struct iscsi_session *session)
1934 * initialize per-task: R2T pool and xmit queue
1936 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1937 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1938 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1941 * pre-allocated x4 as much r2ts to handle race when
1942 * target acks DataOut faster than we data_xmit() queues
1943 * could replenish r2tqueue.
1947 if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
1948 (void***)&tcp_ctask->r2ts,
1949 sizeof(struct iscsi_r2t_info))) {
1950 goto r2t_alloc_fail;
1953 /* R2T xmit queue */
1954 tcp_ctask->r2tqueue = kfifo_alloc(
1955 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
1956 if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
1957 iscsi_pool_free(&tcp_ctask->r2tpool,
1958 (void**)tcp_ctask->r2ts);
1959 goto r2t_alloc_fail;
1966 for (i = 0; i < cmd_i; i++) {
1967 struct iscsi_cmd_task *ctask = session->cmds[i];
1968 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1970 kfifo_free(tcp_ctask->r2tqueue);
1971 iscsi_pool_free(&tcp_ctask->r2tpool,
1972 (void**)tcp_ctask->r2ts);
1978 iscsi_r2tpool_free(struct iscsi_session *session)
1982 for (i = 0; i < session->cmds_max; i++) {
1983 struct iscsi_cmd_task *ctask = session->cmds[i];
1984 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1986 kfifo_free(tcp_ctask->r2tqueue);
1987 iscsi_pool_free(&tcp_ctask->r2tpool,
1988 (void**)tcp_ctask->r2ts);
1993 iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
1994 char *buf, int buflen)
1996 struct iscsi_conn *conn = cls_conn->dd_data;
1997 struct iscsi_session *session = conn->session;
1998 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2002 case ISCSI_PARAM_HDRDGST_EN:
2003 iscsi_set_param(cls_conn, param, buf, buflen);
2004 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
2005 if (conn->hdrdgst_en)
2006 tcp_conn->hdr_size += sizeof(__u32);
2008 case ISCSI_PARAM_DATADGST_EN:
2009 iscsi_set_param(cls_conn, param, buf, buflen);
2010 tcp_conn->sendpage = conn->datadgst_en ?
2011 sock_no_sendpage : tcp_conn->sock->ops->sendpage;
2013 case ISCSI_PARAM_MAX_R2T:
2014 sscanf(buf, "%d", &value);
2015 if (session->max_r2t == roundup_pow_of_two(value))
2017 iscsi_r2tpool_free(session);
2018 iscsi_set_param(cls_conn, param, buf, buflen);
2019 if (session->max_r2t & (session->max_r2t - 1))
2020 session->max_r2t = roundup_pow_of_two(session->max_r2t);
2021 if (iscsi_r2tpool_alloc(session))
2025 return iscsi_set_param(cls_conn, param, buf, buflen);
2032 iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
2033 enum iscsi_param param, char *buf)
2035 struct iscsi_conn *conn = cls_conn->dd_data;
2036 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2037 struct inet_sock *inet;
2038 struct ipv6_pinfo *np;
2043 case ISCSI_PARAM_CONN_PORT:
2044 mutex_lock(&conn->xmitmutex);
2045 if (!tcp_conn->sock) {
2046 mutex_unlock(&conn->xmitmutex);
2050 inet = inet_sk(tcp_conn->sock->sk);
2051 len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport));
2052 mutex_unlock(&conn->xmitmutex);
2054 case ISCSI_PARAM_CONN_ADDRESS:
2055 mutex_lock(&conn->xmitmutex);
2056 if (!tcp_conn->sock) {
2057 mutex_unlock(&conn->xmitmutex);
2061 sk = tcp_conn->sock->sk;
2062 if (sk->sk_family == PF_INET) {
2064 len = sprintf(buf, NIPQUAD_FMT "\n",
2065 NIPQUAD(inet->daddr));
2068 len = sprintf(buf, NIP6_FMT "\n", NIP6(np->daddr));
2070 mutex_unlock(&conn->xmitmutex);
2073 return iscsi_conn_get_param(cls_conn, param, buf);
2080 iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
2082 struct iscsi_conn *conn = cls_conn->dd_data;
2083 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2085 stats->txdata_octets = conn->txdata_octets;
2086 stats->rxdata_octets = conn->rxdata_octets;
2087 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2088 stats->dataout_pdus = conn->dataout_pdus_cnt;
2089 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2090 stats->datain_pdus = conn->datain_pdus_cnt;
2091 stats->r2t_pdus = conn->r2t_pdus_cnt;
2092 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2093 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2094 stats->custom_length = 3;
2095 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
2096 stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
2097 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
2098 stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
2099 strcpy(stats->custom[2].desc, "eh_abort_cnt");
2100 stats->custom[2].value = conn->eh_abort_cnt;
2103 static struct iscsi_cls_session *
2104 iscsi_tcp_session_create(struct iscsi_transport *iscsit,
2105 struct scsi_transport_template *scsit,
2106 uint32_t initial_cmdsn, uint32_t *hostno)
2108 struct iscsi_cls_session *cls_session;
2109 struct iscsi_session *session;
2113 cls_session = iscsi_session_setup(iscsit, scsit,
2114 sizeof(struct iscsi_tcp_cmd_task),
2115 sizeof(struct iscsi_tcp_mgmt_task),
2116 initial_cmdsn, &hn);
2121 session = class_to_transport_session(cls_session);
2122 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2123 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2124 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2126 ctask->hdr = &tcp_ctask->hdr;
2129 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
2130 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
2131 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2133 mtask->hdr = &tcp_mtask->hdr;
2136 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
2137 goto r2tpool_alloc_fail;
2142 iscsi_session_teardown(cls_session);
2146 static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
2148 iscsi_r2tpool_free(class_to_transport_session(cls_session));
2149 iscsi_session_teardown(cls_session);
2152 static struct scsi_host_template iscsi_sht = {
2153 .name = "iSCSI Initiator over TCP/IP",
2154 .queuecommand = iscsi_queuecommand,
2155 .change_queue_depth = iscsi_change_queue_depth,
2156 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
2157 .sg_tablesize = ISCSI_SG_TABLESIZE,
2158 .max_sectors = 0xFFFF,
2159 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
2160 .eh_abort_handler = iscsi_eh_abort,
2161 .eh_host_reset_handler = iscsi_eh_host_reset,
2162 .use_clustering = DISABLE_CLUSTERING,
2163 .proc_name = "iscsi_tcp",
2167 static struct iscsi_transport iscsi_tcp_transport = {
2168 .owner = THIS_MODULE,
2170 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
2172 .param_mask = ISCSI_MAX_RECV_DLENGTH |
2173 ISCSI_MAX_XMIT_DLENGTH |
2176 ISCSI_INITIAL_R2T_EN |
2181 ISCSI_PDU_INORDER_EN |
2182 ISCSI_DATASEQ_INORDER_EN |
2185 ISCSI_CONN_ADDRESS |
2187 ISCSI_PERSISTENT_PORT |
2188 ISCSI_PERSISTENT_ADDRESS |
2191 .host_param_mask = ISCSI_HOST_HWADDRESS |
2192 ISCSI_HOST_INITIATOR_NAME,
2193 .host_template = &iscsi_sht,
2194 .conndata_size = sizeof(struct iscsi_conn),
2196 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
2197 /* session management */
2198 .create_session = iscsi_tcp_session_create,
2199 .destroy_session = iscsi_tcp_session_destroy,
2200 /* connection management */
2201 .create_conn = iscsi_tcp_conn_create,
2202 .bind_conn = iscsi_tcp_conn_bind,
2203 .destroy_conn = iscsi_tcp_conn_destroy,
2204 .set_param = iscsi_conn_set_param,
2205 .get_conn_param = iscsi_tcp_conn_get_param,
2206 .get_session_param = iscsi_session_get_param,
2207 .start_conn = iscsi_conn_start,
2208 .stop_conn = iscsi_tcp_conn_stop,
2209 /* iscsi host params */
2210 .get_host_param = iscsi_host_get_param,
2211 .set_host_param = iscsi_host_set_param,
2213 .send_pdu = iscsi_conn_send_pdu,
2214 .get_stats = iscsi_conn_get_stats,
2215 .init_cmd_task = iscsi_tcp_cmd_init,
2216 .init_mgmt_task = iscsi_tcp_mgmt_init,
2217 .xmit_cmd_task = iscsi_tcp_ctask_xmit,
2218 .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
2219 .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
2221 .session_recovery_timedout = iscsi_session_recovery_timedout,
2225 iscsi_tcp_init(void)
2227 if (iscsi_max_lun < 1) {
2228 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
2232 iscsi_tcp_transport.max_lun = iscsi_max_lun;
2234 if (!iscsi_register_transport(&iscsi_tcp_transport))
2241 iscsi_tcp_exit(void)
2243 iscsi_unregister_transport(&iscsi_tcp_transport);
2246 module_init(iscsi_tcp_init);
2247 module_exit(iscsi_tcp_exit);