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>
38 #include <scsi/scsi_cmnd.h>
39 #include <scsi/scsi_device.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 += 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 > sc->request_bufflen) {
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, sc->request_bufflen);
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 <= sc->request_bufflen) {
253 sc->resid = 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 sc->resid = 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 hdr = &r2t->dtask.hdr;
289 memset(hdr, 0, sizeof(struct iscsi_data));
291 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
292 r2t->solicit_datasn++;
293 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
294 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
295 hdr->itt = ctask->hdr->itt;
296 hdr->exp_statsn = r2t->exp_statsn;
297 hdr->offset = cpu_to_be32(r2t->data_offset);
298 if (r2t->data_length > conn->max_xmit_dlength) {
299 hton24(hdr->dlength, conn->max_xmit_dlength);
300 r2t->data_count = conn->max_xmit_dlength;
303 hton24(hdr->dlength, r2t->data_length);
304 r2t->data_count = r2t->data_length;
305 hdr->flags = ISCSI_FLAG_CMD_FINAL;
307 conn->dataout_pdus_cnt++;
311 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
312 sizeof(struct iscsi_hdr));
316 struct scatterlist *sg = sc->request_buffer;
319 for (i = 0; i < sc->use_sg; i++, sg += 1) {
320 /* FIXME: prefetch ? */
321 if (sg_count + sg->length > r2t->data_offset) {
326 /* offset within this page */
327 page_offset = r2t->data_offset - sg_count;
329 /* fill in this buffer */
330 iscsi_buf_init_sg(&r2t->sendbuf, sg);
331 r2t->sendbuf.sg.offset += page_offset;
332 r2t->sendbuf.sg.length -= page_offset;
334 /* xmit logic will continue with next one */
338 sg_count += sg->length;
340 BUG_ON(r2t->sg == NULL);
342 iscsi_buf_init_iov(&r2t->sendbuf,
343 (char*)sc->request_buffer + r2t->data_offset,
350 * iscsi_r2t_rsp - iSCSI R2T Response processing
351 * @conn: iscsi connection
352 * @ctask: scsi command task
355 iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
357 struct iscsi_r2t_info *r2t;
358 struct iscsi_session *session = conn->session;
359 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
360 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
361 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
362 int r2tsn = be32_to_cpu(rhdr->r2tsn);
365 if (tcp_conn->in.datalen) {
366 printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n",
367 tcp_conn->in.datalen);
368 return ISCSI_ERR_DATALEN;
371 if (tcp_ctask->exp_datasn != r2tsn){
372 debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
373 __FUNCTION__, tcp_ctask->exp_datasn, r2tsn);
374 return ISCSI_ERR_R2TSN;
377 /* fill-in new R2T associated with the task */
378 spin_lock(&session->lock);
379 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
381 if (!ctask->sc || ctask->mtask ||
382 session->state != ISCSI_STATE_LOGGED_IN) {
383 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
384 "recovery...\n", ctask->itt);
385 spin_unlock(&session->lock);
389 rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
392 r2t->exp_statsn = rhdr->statsn;
393 r2t->data_length = be32_to_cpu(rhdr->data_length);
394 if (r2t->data_length == 0) {
395 printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
396 spin_unlock(&session->lock);
397 return ISCSI_ERR_DATALEN;
400 if (r2t->data_length > session->max_burst)
401 debug_scsi("invalid R2T with data len %u and max burst %u."
402 "Attempting to execute request.\n",
403 r2t->data_length, session->max_burst);
405 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
406 if (r2t->data_offset + r2t->data_length > ctask->sc->request_bufflen) {
407 spin_unlock(&session->lock);
408 printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
409 "offset %u and total length %d\n", r2t->data_length,
410 r2t->data_offset, ctask->sc->request_bufflen);
411 return ISCSI_ERR_DATALEN;
414 r2t->ttt = rhdr->ttt; /* no flip */
415 r2t->solicit_datasn = 0;
417 iscsi_solicit_data_init(conn, ctask, r2t);
419 tcp_ctask->exp_datasn = r2tsn + 1;
420 __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
421 tcp_ctask->xmstate |= XMSTATE_SOL_HDR_INIT;
422 list_move_tail(&ctask->running, &conn->xmitqueue);
424 scsi_queue_work(session->host, &conn->xmitwork);
425 conn->r2t_pdus_cnt++;
426 spin_unlock(&session->lock);
432 iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
434 int rc = 0, opcode, ahslen;
435 struct iscsi_hdr *hdr;
436 struct iscsi_session *session = conn->session;
437 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
438 uint32_t cdgst, rdgst = 0, itt;
440 hdr = tcp_conn->in.hdr;
442 /* verify PDU length */
443 tcp_conn->in.datalen = ntoh24(hdr->dlength);
444 if (tcp_conn->in.datalen > conn->max_recv_dlength) {
445 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
446 tcp_conn->in.datalen, conn->max_recv_dlength);
447 return ISCSI_ERR_DATALEN;
449 tcp_conn->data_copied = 0;
452 ahslen = hdr->hlength << 2;
453 tcp_conn->in.offset += ahslen;
454 tcp_conn->in.copy -= ahslen;
455 if (tcp_conn->in.copy < 0) {
456 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
457 "%d bytes\n", ahslen);
458 return ISCSI_ERR_AHSLEN;
461 /* calculate read padding */
462 tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
463 if (tcp_conn->in.padding) {
464 tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
465 debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
468 if (conn->hdrdgst_en) {
469 struct scatterlist sg;
471 sg_init_one(&sg, (u8 *)hdr,
472 sizeof(struct iscsi_hdr) + ahslen);
473 crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length,
475 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
477 if (cdgst != rdgst) {
478 printk(KERN_ERR "iscsi_tcp: hdrdgst error "
479 "recv 0x%x calc 0x%x\n", rdgst, cdgst);
480 return ISCSI_ERR_HDR_DGST;
484 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
485 /* verify itt (itt encoding: age+cid+itt) */
486 rc = iscsi_verify_itt(conn, hdr, &itt);
487 if (rc == ISCSI_ERR_NO_SCSI_CMD) {
488 tcp_conn->in.datalen = 0; /* force drop */
493 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
494 opcode, tcp_conn->in.offset, tcp_conn->in.copy,
495 ahslen, tcp_conn->in.datalen);
498 case ISCSI_OP_SCSI_DATA_IN:
499 tcp_conn->in.ctask = session->cmds[itt];
500 rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
504 case ISCSI_OP_SCSI_CMD_RSP:
505 tcp_conn->in.ctask = session->cmds[itt];
506 if (tcp_conn->in.datalen)
509 spin_lock(&session->lock);
510 rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
511 spin_unlock(&session->lock);
514 tcp_conn->in.ctask = session->cmds[itt];
516 rc = ISCSI_ERR_AHSLEN;
517 else if (tcp_conn->in.ctask->sc->sc_data_direction ==
519 rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
521 rc = ISCSI_ERR_PROTO;
523 case ISCSI_OP_LOGIN_RSP:
524 case ISCSI_OP_TEXT_RSP:
525 case ISCSI_OP_REJECT:
526 case ISCSI_OP_ASYNC_EVENT:
528 * It is possible that we could get a PDU with a buffer larger
529 * than 8K, but there are no targets that currently do this.
530 * For now we fail until we find a vendor that needs it
532 if (ISCSI_DEF_MAX_RECV_SEG_LEN <
533 tcp_conn->in.datalen) {
534 printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
535 "but conn buffer is only %u (opcode %0x)\n",
536 tcp_conn->in.datalen,
537 ISCSI_DEF_MAX_RECV_SEG_LEN, opcode);
538 rc = ISCSI_ERR_PROTO;
542 if (tcp_conn->in.datalen)
545 case ISCSI_OP_LOGOUT_RSP:
546 case ISCSI_OP_NOOP_IN:
547 case ISCSI_OP_SCSI_TMFUNC_RSP:
548 rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
551 rc = ISCSI_ERR_BAD_OPCODE;
559 * if we did zero copy for the header but we will need multiple
560 * skbs to complete the command then we have to copy the header
563 if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
564 (tcp_conn->in.datalen + tcp_conn->in.padding +
565 (conn->datadgst_en ? 4 : 0))) {
566 debug_tcp("Copying header for later use. in.copy %d in.datalen"
567 " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
568 memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
569 sizeof(struct iscsi_hdr));
570 tcp_conn->in.hdr = &tcp_conn->hdr;
571 tcp_conn->in.zero_copy_hdr = 0;
577 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
578 * @conn: iscsi tcp connection
579 * @ctask: scsi command task
580 * @buf: buffer to copy to
581 * @buf_size: size of buffer
582 * @offset: offset within the buffer
585 * The function calls skb_copy_bits() and updates per-connection and
586 * per-cmd byte counters.
588 * Read counters (in bytes):
590 * conn->in.offset offset within in progress SKB
591 * conn->in.copy left to copy from in progress SKB
593 * conn->in.copied copied already from in progress SKB
594 * conn->data_copied copied already from in progress buffer
595 * ctask->sent total bytes sent up to the MidLayer
596 * ctask->data_count left to copy from in progress Data-In
597 * buf_left left to copy from in progress buffer
600 iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
601 void *buf, int buf_size, int offset)
603 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
604 int buf_left = buf_size - (tcp_conn->data_copied + offset);
605 unsigned size = min(tcp_conn->in.copy, buf_left);
608 size = min(size, ctask->data_count);
610 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
611 size, tcp_conn->in.offset, tcp_conn->in.copied);
614 BUG_ON(tcp_ctask->sent + size > ctask->sc->request_bufflen);
616 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
617 (char*)buf + (offset + tcp_conn->data_copied), size);
618 /* must fit into skb->len */
621 tcp_conn->in.offset += size;
622 tcp_conn->in.copy -= size;
623 tcp_conn->in.copied += size;
624 tcp_conn->data_copied += size;
625 tcp_ctask->sent += size;
626 ctask->data_count -= size;
628 BUG_ON(tcp_conn->in.copy < 0);
629 BUG_ON(ctask->data_count < 0);
631 if (buf_size != (tcp_conn->data_copied + offset)) {
632 if (!ctask->data_count) {
633 BUG_ON(buf_size - tcp_conn->data_copied < 0);
634 /* done with this PDU */
635 return buf_size - tcp_conn->data_copied;
640 /* done with this buffer or with both - PDU and buffer */
641 tcp_conn->data_copied = 0;
646 * iscsi_tcp_copy - copy skb bits to the destanation buffer
647 * @conn: iscsi tcp connection
650 * The function calls skb_copy_bits() and updates per-connection
654 iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size)
656 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
657 int buf_left = buf_size - tcp_conn->data_copied;
658 int size = min(tcp_conn->in.copy, buf_left);
661 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
662 size, tcp_conn->in.offset, tcp_conn->data_copied);
665 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
666 (char*)conn->data + tcp_conn->data_copied, size);
669 tcp_conn->in.offset += size;
670 tcp_conn->in.copy -= size;
671 tcp_conn->in.copied += size;
672 tcp_conn->data_copied += size;
674 if (buf_size != tcp_conn->data_copied)
681 partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg,
682 int offset, int length)
684 struct scatterlist temp;
686 memcpy(&temp, sg, sizeof(struct scatterlist));
687 temp.offset = offset;
688 temp.length = length;
689 crypto_hash_update(desc, &temp, length);
693 iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
695 struct scatterlist tmp;
697 sg_init_one(&tmp, buf, len);
698 crypto_hash_update(&tcp_conn->rx_hash, &tmp, len);
701 static int iscsi_scsi_data_in(struct iscsi_conn *conn)
703 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
704 struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
705 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
706 struct scsi_cmnd *sc = ctask->sc;
707 struct scatterlist *sg;
708 int i, offset, rc = 0;
710 BUG_ON((void*)ctask != sc->SCp.ptr);
713 * copying Data-In into the Scsi_Cmnd
716 i = ctask->data_count;
717 rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
719 tcp_ctask->data_offset);
722 if (conn->datadgst_en)
723 iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
729 offset = tcp_ctask->data_offset;
730 sg = sc->request_buffer;
732 if (tcp_ctask->data_offset)
733 for (i = 0; i < tcp_ctask->sg_count; i++)
734 offset -= sg[i].length;
735 /* we've passed through partial sg*/
739 for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
742 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
743 rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
744 sg[i].length, offset);
745 kunmap_atomic(dest, KM_SOFTIRQ0);
747 /* continue with the next SKB/PDU */
750 if (conn->datadgst_en) {
754 &sg[i], sg[i].length);
756 partial_sg_digest_update(
759 sg[i].offset + offset,
760 sg[i].length - offset);
763 tcp_ctask->sg_count++;
766 if (!ctask->data_count) {
767 if (rc && conn->datadgst_en)
769 * data-in is complete, but buffer not...
771 partial_sg_digest_update(&tcp_conn->rx_hash,
779 if (!tcp_conn->in.copy)
782 BUG_ON(ctask->data_count);
785 /* check for non-exceptional status */
786 if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
787 debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
788 (long)sc, sc->result, ctask->itt,
789 tcp_conn->in.hdr->flags);
790 spin_lock(&conn->session->lock);
791 __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
792 spin_unlock(&conn->session->lock);
799 iscsi_data_recv(struct iscsi_conn *conn)
801 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
804 opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
806 case ISCSI_OP_SCSI_DATA_IN:
807 rc = iscsi_scsi_data_in(conn);
809 case ISCSI_OP_SCSI_CMD_RSP:
810 case ISCSI_OP_TEXT_RSP:
811 case ISCSI_OP_LOGIN_RSP:
812 case ISCSI_OP_ASYNC_EVENT:
813 case ISCSI_OP_REJECT:
815 * Collect data segment to the connection's data
818 if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) {
823 rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
824 tcp_conn->in.datalen);
825 if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
826 iscsi_recv_digest_update(tcp_conn, conn->data,
827 tcp_conn->in.datalen);
837 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
838 * @rd_desc: read descriptor
839 * @skb: socket buffer
840 * @offset: offset in skb
841 * @len: skb->len - offset
844 iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
845 unsigned int offset, size_t len)
848 struct iscsi_conn *conn = rd_desc->arg.data;
849 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
851 char pad[ISCSI_PAD_LEN];
852 struct scatterlist sg;
855 * Save current SKB and its offset in the corresponding
856 * connection context.
858 tcp_conn->in.copy = skb->len - offset;
859 tcp_conn->in.offset = offset;
860 tcp_conn->in.skb = skb;
861 tcp_conn->in.len = tcp_conn->in.copy;
862 BUG_ON(tcp_conn->in.copy <= 0);
863 debug_tcp("in %d bytes\n", tcp_conn->in.copy);
866 tcp_conn->in.copied = 0;
869 if (unlikely(conn->suspend_rx)) {
870 debug_tcp("conn %d Rx suspended!\n", conn->id);
874 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
875 tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
876 rc = iscsi_hdr_extract(tcp_conn);
881 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
887 * Verify and process incoming PDU header.
889 rc = iscsi_tcp_hdr_recv(conn);
890 if (!rc && tcp_conn->in.datalen) {
891 if (conn->datadgst_en)
892 crypto_hash_init(&tcp_conn->rx_hash);
893 tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
895 iscsi_conn_failure(conn, rc);
900 if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV &&
902 uint32_t recv_digest;
904 debug_tcp("extra data_recv offset %d copy %d\n",
905 tcp_conn->in.offset, tcp_conn->in.copy);
907 if (!tcp_conn->data_copied) {
908 if (tcp_conn->in.padding) {
909 debug_tcp("padding -> %d\n",
910 tcp_conn->in.padding);
911 memset(pad, 0, tcp_conn->in.padding);
912 sg_init_one(&sg, pad, tcp_conn->in.padding);
913 crypto_hash_update(&tcp_conn->rx_hash,
916 crypto_hash_final(&tcp_conn->rx_hash,
917 (u8 *) &tcp_conn->in.datadgst);
918 debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
921 rc = iscsi_tcp_copy(conn, sizeof(uint32_t));
925 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
929 memcpy(&recv_digest, conn->data, sizeof(uint32_t));
930 if (recv_digest != tcp_conn->in.datadgst) {
931 debug_tcp("iscsi_tcp: data digest error!"
932 "0x%x != 0x%x\n", recv_digest,
933 tcp_conn->in.datadgst);
934 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
937 debug_tcp("iscsi_tcp: data digest match!"
938 "0x%x == 0x%x\n", recv_digest,
939 tcp_conn->in.datadgst);
940 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
944 if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
946 debug_tcp("data_recv offset %d copy %d\n",
947 tcp_conn->in.offset, tcp_conn->in.copy);
949 rc = iscsi_data_recv(conn);
953 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
957 if (tcp_conn->in.padding)
958 tcp_conn->in_progress = IN_PROGRESS_PAD_RECV;
959 else if (conn->datadgst_en)
960 tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
962 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
963 tcp_conn->data_copied = 0;
966 if (tcp_conn->in_progress == IN_PROGRESS_PAD_RECV &&
968 int copylen = min(tcp_conn->in.padding - tcp_conn->data_copied,
971 tcp_conn->in.copy -= copylen;
972 tcp_conn->in.offset += copylen;
973 tcp_conn->data_copied += copylen;
975 if (tcp_conn->data_copied != tcp_conn->in.padding)
976 tcp_conn->in_progress = IN_PROGRESS_PAD_RECV;
977 else if (conn->datadgst_en)
978 tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
980 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
981 tcp_conn->data_copied = 0;
984 debug_tcp("f, processed %d from out of %d padding %d\n",
985 tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
986 BUG_ON(tcp_conn->in.offset - offset > len);
988 if (tcp_conn->in.offset - offset != len) {
989 debug_tcp("continue to process %d bytes\n",
990 (int)len - (tcp_conn->in.offset - offset));
995 processed = tcp_conn->in.offset - offset;
996 BUG_ON(processed == 0);
1000 processed = tcp_conn->in.offset - offset;
1001 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
1002 processed, (int)len, (int)rd_desc->count);
1003 BUG_ON(processed == 0);
1004 BUG_ON(processed > len);
1006 conn->rxdata_octets += processed;
1011 iscsi_tcp_data_ready(struct sock *sk, int flag)
1013 struct iscsi_conn *conn = sk->sk_user_data;
1014 read_descriptor_t rd_desc;
1016 read_lock(&sk->sk_callback_lock);
1019 * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
1020 * We set count to 1 because we want the network layer to
1021 * hand us all the skbs that are available. iscsi_tcp_data_recv
1022 * handled pdus that cross buffers or pdus that still need data.
1024 rd_desc.arg.data = conn;
1026 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
1028 read_unlock(&sk->sk_callback_lock);
1032 iscsi_tcp_state_change(struct sock *sk)
1034 struct iscsi_tcp_conn *tcp_conn;
1035 struct iscsi_conn *conn;
1036 struct iscsi_session *session;
1037 void (*old_state_change)(struct sock *);
1039 read_lock(&sk->sk_callback_lock);
1041 conn = (struct iscsi_conn*)sk->sk_user_data;
1042 session = conn->session;
1044 if ((sk->sk_state == TCP_CLOSE_WAIT ||
1045 sk->sk_state == TCP_CLOSE) &&
1046 !atomic_read(&sk->sk_rmem_alloc)) {
1047 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1048 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1051 tcp_conn = conn->dd_data;
1052 old_state_change = tcp_conn->old_state_change;
1054 read_unlock(&sk->sk_callback_lock);
1056 old_state_change(sk);
1060 * iscsi_write_space - Called when more output buffer space is available
1061 * @sk: socket space is available for
1064 iscsi_write_space(struct sock *sk)
1066 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1067 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1069 tcp_conn->old_write_space(sk);
1070 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1071 scsi_queue_work(conn->session->host, &conn->xmitwork);
1075 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1077 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1078 struct sock *sk = tcp_conn->sock->sk;
1080 /* assign new callbacks */
1081 write_lock_bh(&sk->sk_callback_lock);
1082 sk->sk_user_data = conn;
1083 tcp_conn->old_data_ready = sk->sk_data_ready;
1084 tcp_conn->old_state_change = sk->sk_state_change;
1085 tcp_conn->old_write_space = sk->sk_write_space;
1086 sk->sk_data_ready = iscsi_tcp_data_ready;
1087 sk->sk_state_change = iscsi_tcp_state_change;
1088 sk->sk_write_space = iscsi_write_space;
1089 write_unlock_bh(&sk->sk_callback_lock);
1093 iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
1095 struct sock *sk = tcp_conn->sock->sk;
1097 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1098 write_lock_bh(&sk->sk_callback_lock);
1099 sk->sk_user_data = NULL;
1100 sk->sk_data_ready = tcp_conn->old_data_ready;
1101 sk->sk_state_change = tcp_conn->old_state_change;
1102 sk->sk_write_space = tcp_conn->old_write_space;
1103 sk->sk_no_check = 0;
1104 write_unlock_bh(&sk->sk_callback_lock);
1108 * iscsi_send - generic send routine
1109 * @sk: kernel's socket
1110 * @buf: buffer to write from
1111 * @size: actual size to write
1112 * @flags: socket's flags
1115 iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
1117 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1118 struct socket *sk = tcp_conn->sock;
1119 int offset = buf->sg.offset + buf->sent, res;
1122 * if we got use_sg=0 or are sending something we kmallocd
1123 * then we did not have to do kmap (kmap returns page_address)
1125 * if we got use_sg > 0, but had to drop down, we do not
1126 * set clustering so this should only happen for that
1129 if (buf->use_sendmsg)
1130 res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
1132 res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
1135 conn->txdata_octets += res;
1140 tcp_conn->sendpage_failures_cnt++;
1144 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1149 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1150 * @conn: iscsi connection
1151 * @buf: buffer to write from
1152 * @datalen: lenght of data to be sent after the header
1158 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1160 int flags = 0; /* MSG_DONTWAIT; */
1163 size = buf->sg.length - buf->sent;
1164 BUG_ON(buf->sent + size > buf->sg.length);
1165 if (buf->sent + size != buf->sg.length || datalen)
1168 res = iscsi_send(conn, buf, size, flags);
1169 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1180 * iscsi_sendpage - send one page of iSCSI Data-Out.
1181 * @conn: iscsi connection
1182 * @buf: buffer to write from
1183 * @count: remaining data
1184 * @sent: number of bytes sent
1190 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1191 int *count, int *sent)
1193 int flags = 0; /* MSG_DONTWAIT; */
1196 size = buf->sg.length - buf->sent;
1197 BUG_ON(buf->sent + size > buf->sg.length);
1200 if (buf->sent + size != buf->sg.length || *count != size)
1203 res = iscsi_send(conn, buf, size, flags);
1204 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1205 size, buf->sent, *count, *sent, res);
1218 iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
1219 struct iscsi_tcp_cmd_task *tcp_ctask)
1221 crypto_hash_init(&tcp_conn->tx_hash);
1222 tcp_ctask->digest_count = 4;
1226 * iscsi_solicit_data_cont - initialize next Data-Out
1227 * @conn: iscsi connection
1228 * @ctask: scsi command task
1230 * @left: bytes left to transfer
1233 * Initialize next Data-Out within this R2T sequence and continue
1234 * to process next Scatter-Gather element(if any) of this SCSI command.
1236 * Called under connection lock.
1239 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1240 struct iscsi_r2t_info *r2t, int left)
1242 struct iscsi_data *hdr;
1243 struct scsi_cmnd *sc = ctask->sc;
1246 hdr = &r2t->dtask.hdr;
1247 memset(hdr, 0, sizeof(struct iscsi_data));
1248 hdr->ttt = r2t->ttt;
1249 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1250 r2t->solicit_datasn++;
1251 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1252 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1253 hdr->itt = ctask->hdr->itt;
1254 hdr->exp_statsn = r2t->exp_statsn;
1255 new_offset = r2t->data_offset + r2t->sent;
1256 hdr->offset = cpu_to_be32(new_offset);
1257 if (left > conn->max_xmit_dlength) {
1258 hton24(hdr->dlength, conn->max_xmit_dlength);
1259 r2t->data_count = conn->max_xmit_dlength;
1261 hton24(hdr->dlength, left);
1262 r2t->data_count = left;
1263 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1265 conn->dataout_pdus_cnt++;
1267 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
1268 sizeof(struct iscsi_hdr));
1270 if (iscsi_buf_left(&r2t->sendbuf))
1274 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1277 iscsi_buf_init_iov(&r2t->sendbuf,
1278 (char*)sc->request_buffer + new_offset,
1284 static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
1287 tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
1288 if (!tcp_ctask->pad_count)
1291 tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
1292 debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
1293 tcp_ctask->xmstate |= XMSTATE_W_PAD;
1297 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1298 * @conn: iscsi connection
1299 * @ctask: scsi command task
1303 iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
1305 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1307 BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
1308 tcp_ctask->xmstate = XMSTATE_CMD_HDR_INIT;
1312 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
1313 * @conn: iscsi connection
1314 * @mtask: task management task
1317 * The function can return -EAGAIN in which case caller must
1318 * call it again later, or recover. '0' return code means successful
1321 * Management xmit state machine consists of these states:
1322 * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header
1323 * XMSTATE_IMM_HDR - PDU Header xmit in progress
1324 * XMSTATE_IMM_DATA - PDU Data xmit in progress
1325 * XMSTATE_IDLE - management PDU is done
1328 iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1330 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1333 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1334 conn->id, tcp_mtask->xmstate, mtask->itt);
1336 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR_INIT) {
1337 iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
1338 sizeof(struct iscsi_hdr));
1340 if (mtask->data_count) {
1341 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1342 iscsi_buf_init_iov(&tcp_mtask->sendbuf,
1347 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1348 conn->stop_stage != STOP_CONN_RECOVER &&
1350 iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
1351 (u8*)tcp_mtask->hdrext);
1353 tcp_mtask->sent = 0;
1354 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR_INIT;
1355 tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
1358 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
1359 rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
1363 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
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_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1400 struct scsi_cmnd *sc = ctask->sc;
1401 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1404 if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_INIT) {
1405 tcp_ctask->sent = 0;
1406 tcp_ctask->sg_count = 0;
1407 tcp_ctask->exp_datasn = 0;
1409 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1411 struct scatterlist *sg = sc->request_buffer;
1413 iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
1414 tcp_ctask->sg = sg + 1;
1415 tcp_ctask->bad_sg = sg + sc->use_sg;
1417 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
1419 sc->request_bufflen);
1420 tcp_ctask->sg = NULL;
1421 tcp_ctask->bad_sg = NULL;
1424 debug_scsi("cmd [itt 0x%x total %d imm_data %d "
1425 "unsol count %d, unsol offset %d]\n",
1426 ctask->itt, sc->request_bufflen,
1427 ctask->imm_count, ctask->unsol_count,
1428 ctask->unsol_offset);
1431 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
1432 sizeof(struct iscsi_hdr));
1434 if (conn->hdrdgst_en)
1435 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1436 (u8*)tcp_ctask->hdrext);
1437 tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT;
1438 tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT;
1441 if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_XMIT) {
1442 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
1445 tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_XMIT;
1447 if (sc->sc_data_direction != DMA_TO_DEVICE)
1450 if (ctask->imm_count) {
1451 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1452 iscsi_set_padding(tcp_ctask, ctask->imm_count);
1454 if (ctask->conn->datadgst_en) {
1455 iscsi_data_digest_init(ctask->conn->dd_data,
1457 tcp_ctask->immdigest = 0;
1461 if (ctask->unsol_count)
1462 tcp_ctask->xmstate |=
1463 XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
1469 iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1471 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1472 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1475 if (tcp_ctask->xmstate & XMSTATE_W_PAD) {
1476 iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
1477 tcp_ctask->pad_count);
1478 if (conn->datadgst_en)
1479 crypto_hash_update(&tcp_conn->tx_hash,
1480 &tcp_ctask->sendbuf.sg,
1481 tcp_ctask->sendbuf.sg.length);
1482 } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD))
1485 tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
1486 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD;
1487 debug_scsi("sending %d pad bytes for itt 0x%x\n",
1488 tcp_ctask->pad_count, ctask->itt);
1489 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
1492 debug_scsi("padding send failed %d\n", rc);
1493 tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD;
1499 iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1500 struct iscsi_buf *buf, uint32_t *digest)
1502 struct iscsi_tcp_cmd_task *tcp_ctask;
1503 struct iscsi_tcp_conn *tcp_conn;
1506 if (!conn->datadgst_en)
1509 tcp_ctask = ctask->dd_data;
1510 tcp_conn = conn->dd_data;
1512 if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) {
1513 crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest);
1514 iscsi_buf_init_iov(buf, (char*)digest, 4);
1516 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST;
1518 rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
1520 debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest,
1523 debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
1524 *digest, ctask->itt);
1525 tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST;
1531 iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
1532 struct scatterlist **sg, int *sent, int *count,
1533 struct iscsi_buf *digestbuf, uint32_t *digest)
1535 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1536 struct iscsi_conn *conn = ctask->conn;
1537 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1538 int rc, buf_sent, offset;
1542 offset = sendbuf->sent;
1544 rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent);
1545 *sent = *sent + buf_sent;
1546 if (buf_sent && conn->datadgst_en)
1547 partial_sg_digest_update(&tcp_conn->tx_hash,
1548 &sendbuf->sg, sendbuf->sg.offset + offset,
1550 if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
1551 iscsi_buf_init_sg(sendbuf, *sg);
1559 rc = iscsi_send_padding(conn, ctask);
1563 return iscsi_send_digest(conn, ctask, digestbuf, digest);
1567 iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1569 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1570 struct iscsi_data_task *dtask;
1573 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1574 if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
1575 dtask = &tcp_ctask->unsol_dtask;
1577 iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
1578 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
1579 sizeof(struct iscsi_hdr));
1580 if (conn->hdrdgst_en)
1581 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1582 (u8*)dtask->hdrext);
1584 tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
1585 iscsi_set_padding(tcp_ctask, ctask->data_count);
1588 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
1590 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1591 tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
1595 if (conn->datadgst_en) {
1596 dtask = &tcp_ctask->unsol_dtask;
1597 iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
1601 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1602 ctask->itt, ctask->unsol_count, tcp_ctask->sent);
1607 iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1609 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1612 if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
1613 BUG_ON(!ctask->unsol_count);
1614 tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
1616 rc = iscsi_send_unsol_hdr(conn, ctask);
1621 if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
1622 struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
1623 int start = tcp_ctask->sent;
1625 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1626 &tcp_ctask->sent, &ctask->data_count,
1627 &dtask->digestbuf, &dtask->digest);
1628 ctask->unsol_count -= tcp_ctask->sent - start;
1631 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1633 * Done with the Data-Out. Next, check if we need
1634 * to send another unsolicited Data-Out.
1636 if (ctask->unsol_count) {
1637 debug_scsi("sending more uns\n");
1638 tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
1645 static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
1646 struct iscsi_cmd_task *ctask)
1648 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1649 struct iscsi_session *session = conn->session;
1650 struct iscsi_r2t_info *r2t;
1651 struct iscsi_data_task *dtask;
1654 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR_INIT) {
1655 if (!tcp_ctask->r2t) {
1656 spin_lock_bh(&session->lock);
1657 __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
1659 spin_unlock_bh(&session->lock);
1662 r2t = tcp_ctask->r2t;
1663 dtask = &r2t->dtask;
1665 if (conn->hdrdgst_en)
1666 iscsi_hdr_digest(conn, &r2t->headbuf,
1667 (u8*)dtask->hdrext);
1668 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR_INIT;
1669 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
1672 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
1673 r2t = tcp_ctask->r2t;
1674 dtask = &r2t->dtask;
1676 rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
1679 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1680 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1682 if (conn->datadgst_en) {
1683 iscsi_data_digest_init(conn->dd_data, tcp_ctask);
1687 iscsi_set_padding(tcp_ctask, r2t->data_count);
1688 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1689 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
1693 if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
1694 r2t = tcp_ctask->r2t;
1695 dtask = &r2t->dtask;
1697 rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
1698 &r2t->sent, &r2t->data_count,
1699 &dtask->digestbuf, &dtask->digest);
1702 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1705 * Done with this Data-Out. Next, check if we have
1706 * to send another Data-Out for this R2T.
1708 BUG_ON(r2t->data_length - r2t->sent < 0);
1709 left = r2t->data_length - r2t->sent;
1711 iscsi_solicit_data_cont(conn, ctask, r2t, left);
1716 * Done with this R2T. Check if there are more
1717 * outstanding R2Ts ready to be processed.
1719 spin_lock_bh(&session->lock);
1720 tcp_ctask->r2t = NULL;
1721 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
1723 if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t,
1725 tcp_ctask->r2t = r2t;
1726 spin_unlock_bh(&session->lock);
1729 spin_unlock_bh(&session->lock);
1735 * iscsi_tcp_ctask_xmit - xmit normal PDU task
1736 * @conn: iscsi connection
1737 * @ctask: iscsi command task
1740 * The function can return -EAGAIN in which case caller must
1741 * call it again later, or recover. '0' return code means successful
1743 * The function is devided to logical helpers (above) for the different
1746 *iscsi_send_cmd_hdr()
1747 * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate
1749 * XMSTATE_CMD_HDR_XMIT - Transmit header in progress
1752 * XMSTATE_W_PAD - Prepare and send pading
1753 * XMSTATE_W_RESEND_PAD - retry send pading
1756 * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest
1757 * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest
1759 *iscsi_send_unsol_hdr
1760 * XMSTATE_UNS_INIT - prepare un-solicit data header and digest
1761 * XMSTATE_UNS_HDR - send un-solicit header
1763 *iscsi_send_unsol_pdu
1764 * XMSTATE_UNS_DATA - send un-solicit data in progress
1767 * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize
1768 * XMSTATE_SOL_HDR - send solicit header
1769 * XMSTATE_SOL_DATA - send solicit data
1771 *iscsi_tcp_ctask_xmit
1772 * XMSTATE_IMM_DATA - xmit managment data (??)
1775 iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1777 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1780 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
1781 conn->id, tcp_ctask->xmstate, ctask->itt);
1783 rc = iscsi_send_cmd_hdr(conn, ctask);
1786 if (ctask->sc->sc_data_direction != DMA_TO_DEVICE)
1789 if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
1790 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1791 &tcp_ctask->sent, &ctask->imm_count,
1792 &tcp_ctask->immbuf, &tcp_ctask->immdigest);
1795 tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
1798 rc = iscsi_send_unsol_pdu(conn, ctask);
1802 rc = iscsi_send_sol_pdu(conn, ctask);
1809 static struct iscsi_cls_conn *
1810 iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1812 struct iscsi_conn *conn;
1813 struct iscsi_cls_conn *cls_conn;
1814 struct iscsi_tcp_conn *tcp_conn;
1816 cls_conn = iscsi_conn_setup(cls_session, conn_idx);
1819 conn = cls_conn->dd_data;
1821 * due to strange issues with iser these are not set
1822 * in iscsi_conn_setup
1824 conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN;
1826 tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
1828 goto tcp_conn_alloc_fail;
1830 conn->dd_data = tcp_conn;
1831 tcp_conn->iscsi_conn = conn;
1832 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1833 /* initial operational parameters */
1834 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
1836 tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1838 tcp_conn->tx_hash.flags = 0;
1839 if (IS_ERR(tcp_conn->tx_hash.tfm)) {
1840 printk(KERN_ERR "Could not create connection due to crc32c "
1841 "loading error %ld. Make sure the crc32c module is "
1842 "built as a module or into the kernel\n",
1843 PTR_ERR(tcp_conn->tx_hash.tfm));
1847 tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
1849 tcp_conn->rx_hash.flags = 0;
1850 if (IS_ERR(tcp_conn->rx_hash.tfm)) {
1851 printk(KERN_ERR "Could not create connection due to crc32c "
1852 "loading error %ld. Make sure the crc32c module is "
1853 "built as a module or into the kernel\n",
1854 PTR_ERR(tcp_conn->rx_hash.tfm));
1861 crypto_free_hash(tcp_conn->tx_hash.tfm);
1864 tcp_conn_alloc_fail:
1865 iscsi_conn_teardown(cls_conn);
1870 iscsi_tcp_release_conn(struct iscsi_conn *conn)
1872 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1874 if (!tcp_conn->sock)
1877 sock_hold(tcp_conn->sock->sk);
1878 iscsi_conn_restore_callbacks(tcp_conn);
1879 sock_put(tcp_conn->sock->sk);
1881 sock_release(tcp_conn->sock);
1882 tcp_conn->sock = NULL;
1883 conn->recv_lock = NULL;
1887 iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
1889 struct iscsi_conn *conn = cls_conn->dd_data;
1890 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1892 iscsi_tcp_release_conn(conn);
1893 iscsi_conn_teardown(cls_conn);
1895 if (tcp_conn->tx_hash.tfm)
1896 crypto_free_hash(tcp_conn->tx_hash.tfm);
1897 if (tcp_conn->rx_hash.tfm)
1898 crypto_free_hash(tcp_conn->rx_hash.tfm);
1904 iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1906 struct iscsi_conn *conn = cls_conn->dd_data;
1907 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1909 iscsi_conn_stop(cls_conn, flag);
1910 iscsi_tcp_release_conn(conn);
1911 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
1915 iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
1916 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
1919 struct iscsi_conn *conn = cls_conn->dd_data;
1920 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1922 struct socket *sock;
1925 /* lookup for existing socket */
1926 sock = sockfd_lookup((int)transport_eph, &err);
1928 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
1932 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
1936 /* bind iSCSI connection and socket */
1937 tcp_conn->sock = sock;
1939 /* setup Socket parameters */
1942 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
1943 sk->sk_allocation = GFP_ATOMIC;
1945 /* FIXME: disable Nagle's algorithm */
1948 * Intercept TCP callbacks for sendfile like receive
1951 conn->recv_lock = &sk->sk_callback_lock;
1952 iscsi_conn_set_callbacks(conn);
1953 tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
1955 * set receive state machine into initial state
1957 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1962 /* called with host lock */
1964 iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1966 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1967 tcp_mtask->xmstate = XMSTATE_IMM_HDR_INIT;
1971 iscsi_r2tpool_alloc(struct iscsi_session *session)
1977 * initialize per-task: R2T pool and xmit queue
1979 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1980 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1981 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1984 * pre-allocated x4 as much r2ts to handle race when
1985 * target acks DataOut faster than we data_xmit() queues
1986 * could replenish r2tqueue.
1990 if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
1991 (void***)&tcp_ctask->r2ts,
1992 sizeof(struct iscsi_r2t_info))) {
1993 goto r2t_alloc_fail;
1996 /* R2T xmit queue */
1997 tcp_ctask->r2tqueue = kfifo_alloc(
1998 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
1999 if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
2000 iscsi_pool_free(&tcp_ctask->r2tpool,
2001 (void**)tcp_ctask->r2ts);
2002 goto r2t_alloc_fail;
2009 for (i = 0; i < cmd_i; i++) {
2010 struct iscsi_cmd_task *ctask = session->cmds[i];
2011 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2013 kfifo_free(tcp_ctask->r2tqueue);
2014 iscsi_pool_free(&tcp_ctask->r2tpool,
2015 (void**)tcp_ctask->r2ts);
2021 iscsi_r2tpool_free(struct iscsi_session *session)
2025 for (i = 0; i < session->cmds_max; i++) {
2026 struct iscsi_cmd_task *ctask = session->cmds[i];
2027 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2029 kfifo_free(tcp_ctask->r2tqueue);
2030 iscsi_pool_free(&tcp_ctask->r2tpool,
2031 (void**)tcp_ctask->r2ts);
2036 iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
2037 char *buf, int buflen)
2039 struct iscsi_conn *conn = cls_conn->dd_data;
2040 struct iscsi_session *session = conn->session;
2041 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2045 case ISCSI_PARAM_HDRDGST_EN:
2046 iscsi_set_param(cls_conn, param, buf, buflen);
2047 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
2048 if (conn->hdrdgst_en)
2049 tcp_conn->hdr_size += sizeof(__u32);
2051 case ISCSI_PARAM_DATADGST_EN:
2052 iscsi_set_param(cls_conn, param, buf, buflen);
2053 tcp_conn->sendpage = conn->datadgst_en ?
2054 sock_no_sendpage : tcp_conn->sock->ops->sendpage;
2056 case ISCSI_PARAM_MAX_R2T:
2057 sscanf(buf, "%d", &value);
2058 if (session->max_r2t == roundup_pow_of_two(value))
2060 iscsi_r2tpool_free(session);
2061 iscsi_set_param(cls_conn, param, buf, buflen);
2062 if (session->max_r2t & (session->max_r2t - 1))
2063 session->max_r2t = roundup_pow_of_two(session->max_r2t);
2064 if (iscsi_r2tpool_alloc(session))
2068 return iscsi_set_param(cls_conn, param, buf, buflen);
2075 iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
2076 enum iscsi_param param, char *buf)
2078 struct iscsi_conn *conn = cls_conn->dd_data;
2079 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2080 struct inet_sock *inet;
2081 struct ipv6_pinfo *np;
2086 case ISCSI_PARAM_CONN_PORT:
2087 if (!tcp_conn->sock)
2090 inet = inet_sk(tcp_conn->sock->sk);
2091 len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport));
2093 case ISCSI_PARAM_CONN_ADDRESS:
2094 if (!tcp_conn->sock)
2097 sk = tcp_conn->sock->sk;
2098 if (sk->sk_family == PF_INET) {
2100 len = sprintf(buf, NIPQUAD_FMT "\n",
2101 NIPQUAD(inet->daddr));
2104 len = sprintf(buf, NIP6_FMT "\n", NIP6(np->daddr));
2108 return iscsi_conn_get_param(cls_conn, param, buf);
2115 iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
2117 struct iscsi_conn *conn = cls_conn->dd_data;
2118 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2120 stats->txdata_octets = conn->txdata_octets;
2121 stats->rxdata_octets = conn->rxdata_octets;
2122 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2123 stats->dataout_pdus = conn->dataout_pdus_cnt;
2124 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2125 stats->datain_pdus = conn->datain_pdus_cnt;
2126 stats->r2t_pdus = conn->r2t_pdus_cnt;
2127 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2128 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2129 stats->custom_length = 3;
2130 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
2131 stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
2132 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
2133 stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
2134 strcpy(stats->custom[2].desc, "eh_abort_cnt");
2135 stats->custom[2].value = conn->eh_abort_cnt;
2138 static struct iscsi_cls_session *
2139 iscsi_tcp_session_create(struct iscsi_transport *iscsit,
2140 struct scsi_transport_template *scsit,
2141 uint16_t cmds_max, uint16_t qdepth,
2142 uint32_t initial_cmdsn, uint32_t *hostno)
2144 struct iscsi_cls_session *cls_session;
2145 struct iscsi_session *session;
2149 cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth,
2150 sizeof(struct iscsi_tcp_cmd_task),
2151 sizeof(struct iscsi_tcp_mgmt_task),
2152 initial_cmdsn, &hn);
2157 session = class_to_transport_session(cls_session);
2158 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2159 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2160 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2162 ctask->hdr = &tcp_ctask->hdr;
2165 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
2166 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
2167 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2169 mtask->hdr = &tcp_mtask->hdr;
2172 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
2173 goto r2tpool_alloc_fail;
2178 iscsi_session_teardown(cls_session);
2182 static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
2184 iscsi_r2tpool_free(class_to_transport_session(cls_session));
2185 iscsi_session_teardown(cls_session);
2188 static int iscsi_tcp_slave_configure(struct scsi_device *sdev)
2190 blk_queue_dma_alignment(sdev->request_queue, 0);
2194 static struct scsi_host_template iscsi_sht = {
2195 .name = "iSCSI Initiator over TCP/IP",
2196 .queuecommand = iscsi_queuecommand,
2197 .change_queue_depth = iscsi_change_queue_depth,
2198 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
2199 .sg_tablesize = ISCSI_SG_TABLESIZE,
2200 .max_sectors = 0xFFFF,
2201 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
2202 .eh_abort_handler = iscsi_eh_abort,
2203 .eh_host_reset_handler = iscsi_eh_host_reset,
2204 .use_clustering = DISABLE_CLUSTERING,
2205 .slave_configure = iscsi_tcp_slave_configure,
2206 .proc_name = "iscsi_tcp",
2210 static struct iscsi_transport iscsi_tcp_transport = {
2211 .owner = THIS_MODULE,
2213 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
2215 .param_mask = ISCSI_MAX_RECV_DLENGTH |
2216 ISCSI_MAX_XMIT_DLENGTH |
2219 ISCSI_INITIAL_R2T_EN |
2224 ISCSI_PDU_INORDER_EN |
2225 ISCSI_DATASEQ_INORDER_EN |
2228 ISCSI_CONN_ADDRESS |
2230 ISCSI_PERSISTENT_PORT |
2231 ISCSI_PERSISTENT_ADDRESS |
2232 ISCSI_TARGET_NAME | ISCSI_TPGT |
2233 ISCSI_USERNAME | ISCSI_PASSWORD |
2234 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN,
2235 .host_param_mask = ISCSI_HOST_HWADDRESS |
2236 ISCSI_HOST_INITIATOR_NAME,
2237 .host_template = &iscsi_sht,
2238 .conndata_size = sizeof(struct iscsi_conn),
2240 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
2241 /* session management */
2242 .create_session = iscsi_tcp_session_create,
2243 .destroy_session = iscsi_tcp_session_destroy,
2244 /* connection management */
2245 .create_conn = iscsi_tcp_conn_create,
2246 .bind_conn = iscsi_tcp_conn_bind,
2247 .destroy_conn = iscsi_tcp_conn_destroy,
2248 .set_param = iscsi_conn_set_param,
2249 .get_conn_param = iscsi_tcp_conn_get_param,
2250 .get_session_param = iscsi_session_get_param,
2251 .start_conn = iscsi_conn_start,
2252 .stop_conn = iscsi_tcp_conn_stop,
2253 /* iscsi host params */
2254 .get_host_param = iscsi_host_get_param,
2255 .set_host_param = iscsi_host_set_param,
2257 .send_pdu = iscsi_conn_send_pdu,
2258 .get_stats = iscsi_conn_get_stats,
2259 .init_cmd_task = iscsi_tcp_cmd_init,
2260 .init_mgmt_task = iscsi_tcp_mgmt_init,
2261 .xmit_cmd_task = iscsi_tcp_ctask_xmit,
2262 .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
2263 .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
2265 .session_recovery_timedout = iscsi_session_recovery_timedout,
2269 iscsi_tcp_init(void)
2271 if (iscsi_max_lun < 1) {
2272 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
2276 iscsi_tcp_transport.max_lun = iscsi_max_lun;
2278 if (!iscsi_register_transport(&iscsi_tcp_transport))
2285 iscsi_tcp_exit(void)
2287 iscsi_unregister_transport(&iscsi_tcp_transport);
2290 module_init(iscsi_tcp_init);
2291 module_exit(iscsi_tcp_exit);