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_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc);
112 buf->sg.length += sizeof(uint32_t);
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 int datasn = be32_to_cpu(rhdr->datasn);
221 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
225 * setup Data-In byte counter (gets decremented..)
227 ctask->data_count = tcp_conn->in.datalen;
229 if (tcp_conn->in.datalen == 0)
232 if (ctask->datasn != datasn)
233 return ISCSI_ERR_DATASN;
237 tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
238 if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length)
239 return ISCSI_ERR_DATA_OFFSET;
241 if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
242 struct scsi_cmnd *sc = ctask->sc;
244 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
245 if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
246 int res_count = be32_to_cpu(rhdr->residual_count);
249 res_count <= sc->request_bufflen) {
250 sc->resid = res_count;
251 sc->result = (DID_OK << 16) | rhdr->cmd_status;
253 sc->result = (DID_BAD_TARGET << 16) |
255 } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
256 sc->resid = be32_to_cpu(rhdr->residual_count);
257 sc->result = (DID_OK << 16) | rhdr->cmd_status;
259 sc->result = (DID_OK << 16) | rhdr->cmd_status;
262 conn->datain_pdus_cnt++;
267 * iscsi_solicit_data_init - initialize first Data-Out
268 * @conn: iscsi connection
269 * @ctask: scsi command task
273 * Initialize first Data-Out within this R2T sequence and finds
274 * proper data_offset within this SCSI command.
276 * This function is called with connection lock taken.
279 iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
280 struct iscsi_r2t_info *r2t)
282 struct iscsi_data *hdr;
283 struct scsi_cmnd *sc = ctask->sc;
284 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
286 hdr = &r2t->dtask.hdr;
287 memset(hdr, 0, sizeof(struct iscsi_data));
289 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
290 r2t->solicit_datasn++;
291 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
292 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
293 hdr->itt = ctask->hdr->itt;
294 hdr->exp_statsn = r2t->exp_statsn;
295 hdr->offset = cpu_to_be32(r2t->data_offset);
296 if (r2t->data_length > conn->max_xmit_dlength) {
297 hton24(hdr->dlength, conn->max_xmit_dlength);
298 r2t->data_count = conn->max_xmit_dlength;
301 hton24(hdr->dlength, r2t->data_length);
302 r2t->data_count = r2t->data_length;
303 hdr->flags = ISCSI_FLAG_CMD_FINAL;
305 conn->dataout_pdus_cnt++;
309 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
310 sizeof(struct iscsi_hdr));
314 struct scatterlist *sg = sc->request_buffer;
317 for (i = 0; i < sc->use_sg; i++, sg += 1) {
318 /* FIXME: prefetch ? */
319 if (sg_count + sg->length > r2t->data_offset) {
324 /* offset within this page */
325 page_offset = r2t->data_offset - sg_count;
327 /* fill in this buffer */
328 iscsi_buf_init_sg(&r2t->sendbuf, sg);
329 r2t->sendbuf.sg.offset += page_offset;
330 r2t->sendbuf.sg.length -= page_offset;
332 /* xmit logic will continue with next one */
336 sg_count += sg->length;
338 BUG_ON(r2t->sg == NULL);
340 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
341 (char*)sc->request_buffer + r2t->data_offset,
346 * iscsi_r2t_rsp - iSCSI R2T Response processing
347 * @conn: iscsi connection
348 * @ctask: scsi command task
351 iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
353 struct iscsi_r2t_info *r2t;
354 struct iscsi_session *session = conn->session;
355 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
356 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
357 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
358 int r2tsn = be32_to_cpu(rhdr->r2tsn);
361 if (tcp_conn->in.datalen)
362 return ISCSI_ERR_DATALEN;
364 if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn)
365 return ISCSI_ERR_R2TSN;
367 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
371 /* FIXME: use R2TSN to detect missing R2T */
373 /* fill-in new R2T associated with the task */
374 spin_lock(&session->lock);
375 if (!ctask->sc || ctask->mtask ||
376 session->state != ISCSI_STATE_LOGGED_IN) {
377 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
378 "recovery...\n", ctask->itt);
379 spin_unlock(&session->lock);
383 rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
386 r2t->exp_statsn = rhdr->statsn;
387 r2t->data_length = be32_to_cpu(rhdr->data_length);
388 if (r2t->data_length == 0 ||
389 r2t->data_length > session->max_burst) {
390 spin_unlock(&session->lock);
391 return ISCSI_ERR_DATALEN;
394 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
395 if (r2t->data_offset + r2t->data_length > ctask->total_length) {
396 spin_unlock(&session->lock);
397 return ISCSI_ERR_DATALEN;
400 r2t->ttt = rhdr->ttt; /* no flip */
401 r2t->solicit_datasn = 0;
403 iscsi_solicit_data_init(conn, ctask, r2t);
405 tcp_ctask->exp_r2tsn = r2tsn + 1;
406 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
407 __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
408 list_move_tail(&ctask->running, &conn->xmitqueue);
410 scsi_queue_work(session->host, &conn->xmitwork);
411 conn->r2t_pdus_cnt++;
412 spin_unlock(&session->lock);
418 iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
420 int rc = 0, opcode, ahslen;
421 struct iscsi_hdr *hdr;
422 struct iscsi_session *session = conn->session;
423 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
424 uint32_t cdgst, rdgst = 0, itt;
426 hdr = tcp_conn->in.hdr;
428 /* verify PDU length */
429 tcp_conn->in.datalen = ntoh24(hdr->dlength);
430 if (tcp_conn->in.datalen > conn->max_recv_dlength) {
431 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
432 tcp_conn->in.datalen, conn->max_recv_dlength);
433 return ISCSI_ERR_DATALEN;
435 tcp_conn->data_copied = 0;
438 ahslen = hdr->hlength << 2;
439 tcp_conn->in.offset += ahslen;
440 tcp_conn->in.copy -= ahslen;
441 if (tcp_conn->in.copy < 0) {
442 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
443 "%d bytes\n", ahslen);
444 return ISCSI_ERR_AHSLEN;
447 /* calculate read padding */
448 tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
449 if (tcp_conn->in.padding) {
450 tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
451 debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
454 if (conn->hdrdgst_en) {
455 struct scatterlist sg;
457 sg_init_one(&sg, (u8 *)hdr,
458 sizeof(struct iscsi_hdr) + ahslen);
459 crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
460 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
462 if (cdgst != rdgst) {
463 printk(KERN_ERR "iscsi_tcp: hdrdgst error "
464 "recv 0x%x calc 0x%x\n", rdgst, cdgst);
465 return ISCSI_ERR_HDR_DGST;
469 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
470 /* verify itt (itt encoding: age+cid+itt) */
471 rc = iscsi_verify_itt(conn, hdr, &itt);
472 if (rc == ISCSI_ERR_NO_SCSI_CMD) {
473 tcp_conn->in.datalen = 0; /* force drop */
478 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
479 opcode, tcp_conn->in.offset, tcp_conn->in.copy,
480 ahslen, tcp_conn->in.datalen);
483 case ISCSI_OP_SCSI_DATA_IN:
484 tcp_conn->in.ctask = session->cmds[itt];
485 rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
489 case ISCSI_OP_SCSI_CMD_RSP:
490 tcp_conn->in.ctask = session->cmds[itt];
491 if (tcp_conn->in.datalen)
494 spin_lock(&session->lock);
495 iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask);
496 rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
497 spin_unlock(&session->lock);
500 tcp_conn->in.ctask = session->cmds[itt];
502 rc = ISCSI_ERR_AHSLEN;
503 else if (tcp_conn->in.ctask->sc->sc_data_direction ==
505 rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
507 rc = ISCSI_ERR_PROTO;
509 case ISCSI_OP_LOGIN_RSP:
510 case ISCSI_OP_TEXT_RSP:
511 case ISCSI_OP_REJECT:
512 case ISCSI_OP_ASYNC_EVENT:
514 * It is possible that we could get a PDU with a buffer larger
515 * than 8K, but there are no targets that currently do this.
516 * For now we fail until we find a vendor that needs it
518 if (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH <
519 tcp_conn->in.datalen) {
520 printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
521 "but conn buffer is only %u (opcode %0x)\n",
522 tcp_conn->in.datalen,
523 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, opcode);
524 rc = ISCSI_ERR_PROTO;
528 if (tcp_conn->in.datalen)
531 case ISCSI_OP_LOGOUT_RSP:
532 case ISCSI_OP_NOOP_IN:
533 case ISCSI_OP_SCSI_TMFUNC_RSP:
534 rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
537 rc = ISCSI_ERR_BAD_OPCODE;
545 * if we did zero copy for the header but we will need multiple
546 * skbs to complete the command then we have to copy the header
549 if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
550 (tcp_conn->in.datalen + tcp_conn->in.padding +
551 (conn->datadgst_en ? 4 : 0))) {
552 debug_tcp("Copying header for later use. in.copy %d in.datalen"
553 " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
554 memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
555 sizeof(struct iscsi_hdr));
556 tcp_conn->in.hdr = &tcp_conn->hdr;
557 tcp_conn->in.zero_copy_hdr = 0;
563 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
564 * @conn: iscsi tcp connection
565 * @ctask: scsi command task
566 * @buf: buffer to copy to
567 * @buf_size: size of buffer
568 * @offset: offset within the buffer
571 * The function calls skb_copy_bits() and updates per-connection and
572 * per-cmd byte counters.
574 * Read counters (in bytes):
576 * conn->in.offset offset within in progress SKB
577 * conn->in.copy left to copy from in progress SKB
579 * conn->in.copied copied already from in progress SKB
580 * conn->data_copied copied already from in progress buffer
581 * ctask->sent total bytes sent up to the MidLayer
582 * ctask->data_count left to copy from in progress Data-In
583 * buf_left left to copy from in progress buffer
586 iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
587 void *buf, int buf_size, int offset)
589 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
590 int buf_left = buf_size - (tcp_conn->data_copied + offset);
591 int size = min(tcp_conn->in.copy, buf_left);
594 size = min(size, ctask->data_count);
596 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
597 size, tcp_conn->in.offset, tcp_conn->in.copied);
600 BUG_ON(tcp_ctask->sent + size > ctask->total_length);
602 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
603 (char*)buf + (offset + tcp_conn->data_copied), size);
604 /* must fit into skb->len */
607 tcp_conn->in.offset += size;
608 tcp_conn->in.copy -= size;
609 tcp_conn->in.copied += size;
610 tcp_conn->data_copied += size;
611 tcp_ctask->sent += size;
612 ctask->data_count -= size;
614 BUG_ON(tcp_conn->in.copy < 0);
615 BUG_ON(ctask->data_count < 0);
617 if (buf_size != (tcp_conn->data_copied + offset)) {
618 if (!ctask->data_count) {
619 BUG_ON(buf_size - tcp_conn->data_copied < 0);
620 /* done with this PDU */
621 return buf_size - tcp_conn->data_copied;
626 /* done with this buffer or with both - PDU and buffer */
627 tcp_conn->data_copied = 0;
632 * iscsi_tcp_copy - copy skb bits to the destanation buffer
633 * @conn: iscsi tcp connection
636 * The function calls skb_copy_bits() and updates per-connection
640 iscsi_tcp_copy(struct iscsi_conn *conn)
642 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
643 int buf_size = tcp_conn->in.datalen;
644 int buf_left = buf_size - tcp_conn->data_copied;
645 int size = min(tcp_conn->in.copy, buf_left);
648 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
649 size, tcp_conn->in.offset, tcp_conn->data_copied);
652 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
653 (char*)conn->data + tcp_conn->data_copied, size);
656 tcp_conn->in.offset += size;
657 tcp_conn->in.copy -= size;
658 tcp_conn->in.copied += size;
659 tcp_conn->data_copied += size;
661 if (buf_size != tcp_conn->data_copied)
668 partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn,
669 struct scatterlist *sg, int offset, int length)
671 struct scatterlist temp;
673 memcpy(&temp, sg, sizeof(struct scatterlist));
674 temp.offset = offset;
675 temp.length = length;
676 crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1);
680 iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
682 struct scatterlist tmp;
684 sg_init_one(&tmp, buf, len);
685 crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1);
688 static int iscsi_scsi_data_in(struct iscsi_conn *conn)
690 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
691 struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
692 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
693 struct scsi_cmnd *sc = ctask->sc;
694 struct scatterlist *sg;
695 int i, offset, rc = 0;
697 BUG_ON((void*)ctask != sc->SCp.ptr);
700 * copying Data-In into the Scsi_Cmnd
703 i = ctask->data_count;
704 rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
706 tcp_ctask->data_offset);
709 if (conn->datadgst_en)
710 iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
716 offset = tcp_ctask->data_offset;
717 sg = sc->request_buffer;
719 if (tcp_ctask->data_offset)
720 for (i = 0; i < tcp_ctask->sg_count; i++)
721 offset -= sg[i].length;
722 /* we've passed through partial sg*/
726 for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
729 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
730 rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
731 sg[i].length, offset);
732 kunmap_atomic(dest, KM_SOFTIRQ0);
734 /* continue with the next SKB/PDU */
737 if (conn->datadgst_en) {
739 crypto_digest_update(
740 tcp_conn->data_rx_tfm,
743 partial_sg_digest_update(tcp_conn,
745 sg[i].offset + offset,
746 sg[i].length - offset);
749 tcp_ctask->sg_count++;
752 if (!ctask->data_count) {
753 if (rc && conn->datadgst_en)
755 * data-in is complete, but buffer not...
757 partial_sg_digest_update(tcp_conn, &sg[i],
758 sg[i].offset, sg[i].length-rc);
763 if (!tcp_conn->in.copy)
766 BUG_ON(ctask->data_count);
769 /* check for non-exceptional status */
770 if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
771 debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
772 (long)sc, sc->result, ctask->itt,
773 tcp_conn->in.hdr->flags);
774 spin_lock(&conn->session->lock);
775 iscsi_tcp_cleanup_ctask(conn, ctask);
776 __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
777 spin_unlock(&conn->session->lock);
784 iscsi_data_recv(struct iscsi_conn *conn)
786 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
789 opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
791 case ISCSI_OP_SCSI_DATA_IN:
792 rc = iscsi_scsi_data_in(conn);
794 case ISCSI_OP_SCSI_CMD_RSP:
795 spin_lock(&conn->session->lock);
796 iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask);
797 spin_unlock(&conn->session->lock);
798 case ISCSI_OP_TEXT_RSP:
799 case ISCSI_OP_LOGIN_RSP:
800 case ISCSI_OP_ASYNC_EVENT:
801 case ISCSI_OP_REJECT:
803 * Collect data segment to the connection's data
806 if (iscsi_tcp_copy(conn)) {
811 rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
812 tcp_conn->in.datalen);
813 if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
814 iscsi_recv_digest_update(tcp_conn, conn->data,
815 tcp_conn->in.datalen);
825 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
826 * @rd_desc: read descriptor
827 * @skb: socket buffer
828 * @offset: offset in skb
829 * @len: skb->len - offset
832 iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
833 unsigned int offset, size_t len)
836 struct iscsi_conn *conn = rd_desc->arg.data;
837 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
839 char pad[ISCSI_PAD_LEN];
840 struct scatterlist sg;
843 * Save current SKB and its offset in the corresponding
844 * connection context.
846 tcp_conn->in.copy = skb->len - offset;
847 tcp_conn->in.offset = offset;
848 tcp_conn->in.skb = skb;
849 tcp_conn->in.len = tcp_conn->in.copy;
850 BUG_ON(tcp_conn->in.copy <= 0);
851 debug_tcp("in %d bytes\n", tcp_conn->in.copy);
854 tcp_conn->in.copied = 0;
857 if (unlikely(conn->suspend_rx)) {
858 debug_tcp("conn %d Rx suspended!\n", conn->id);
862 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
863 tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
864 rc = iscsi_hdr_extract(tcp_conn);
869 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
875 * Verify and process incoming PDU header.
877 rc = iscsi_tcp_hdr_recv(conn);
878 if (!rc && tcp_conn->in.datalen) {
879 if (conn->datadgst_en) {
880 BUG_ON(!tcp_conn->data_rx_tfm);
881 crypto_digest_init(tcp_conn->data_rx_tfm);
883 tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
885 iscsi_conn_failure(conn, rc);
890 if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
891 uint32_t recv_digest;
893 debug_tcp("extra data_recv offset %d copy %d\n",
894 tcp_conn->in.offset, tcp_conn->in.copy);
895 skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
897 tcp_conn->in.offset += 4;
898 tcp_conn->in.copy -= 4;
899 if (recv_digest != tcp_conn->in.datadgst) {
900 debug_tcp("iscsi_tcp: data digest error!"
901 "0x%x != 0x%x\n", recv_digest,
902 tcp_conn->in.datadgst);
903 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
906 debug_tcp("iscsi_tcp: data digest match!"
907 "0x%x == 0x%x\n", recv_digest,
908 tcp_conn->in.datadgst);
909 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
913 if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
916 debug_tcp("data_recv offset %d copy %d\n",
917 tcp_conn->in.offset, tcp_conn->in.copy);
919 rc = iscsi_data_recv(conn);
923 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
926 tcp_conn->in.copy -= tcp_conn->in.padding;
927 tcp_conn->in.offset += tcp_conn->in.padding;
928 if (conn->datadgst_en) {
929 if (tcp_conn->in.padding) {
930 debug_tcp("padding -> %d\n",
931 tcp_conn->in.padding);
932 memset(pad, 0, tcp_conn->in.padding);
933 sg_init_one(&sg, pad, tcp_conn->in.padding);
934 crypto_digest_update(tcp_conn->data_rx_tfm,
937 crypto_digest_final(tcp_conn->data_rx_tfm,
938 (u8 *) & tcp_conn->in.datadgst);
939 debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
940 tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
942 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
945 debug_tcp("f, processed %d from out of %d padding %d\n",
946 tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
947 BUG_ON(tcp_conn->in.offset - offset > len);
949 if (tcp_conn->in.offset - offset != len) {
950 debug_tcp("continue to process %d bytes\n",
951 (int)len - (tcp_conn->in.offset - offset));
956 processed = tcp_conn->in.offset - offset;
957 BUG_ON(processed == 0);
961 processed = tcp_conn->in.offset - offset;
962 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
963 processed, (int)len, (int)rd_desc->count);
964 BUG_ON(processed == 0);
965 BUG_ON(processed > len);
967 conn->rxdata_octets += processed;
972 iscsi_tcp_data_ready(struct sock *sk, int flag)
974 struct iscsi_conn *conn = sk->sk_user_data;
975 read_descriptor_t rd_desc;
977 read_lock(&sk->sk_callback_lock);
980 * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
981 * We set count to 1 because we want the network layer to
982 * hand us all the skbs that are available. iscsi_tcp_data_recv
983 * handled pdus that cross buffers or pdus that still need data.
985 rd_desc.arg.data = conn;
987 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
989 read_unlock(&sk->sk_callback_lock);
993 iscsi_tcp_state_change(struct sock *sk)
995 struct iscsi_tcp_conn *tcp_conn;
996 struct iscsi_conn *conn;
997 struct iscsi_session *session;
998 void (*old_state_change)(struct sock *);
1000 read_lock(&sk->sk_callback_lock);
1002 conn = (struct iscsi_conn*)sk->sk_user_data;
1003 session = conn->session;
1005 if ((sk->sk_state == TCP_CLOSE_WAIT ||
1006 sk->sk_state == TCP_CLOSE) &&
1007 !atomic_read(&sk->sk_rmem_alloc)) {
1008 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1009 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1012 tcp_conn = conn->dd_data;
1013 old_state_change = tcp_conn->old_state_change;
1015 read_unlock(&sk->sk_callback_lock);
1017 old_state_change(sk);
1021 * iscsi_write_space - Called when more output buffer space is available
1022 * @sk: socket space is available for
1025 iscsi_write_space(struct sock *sk)
1027 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1028 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1030 tcp_conn->old_write_space(sk);
1031 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1032 scsi_queue_work(conn->session->host, &conn->xmitwork);
1036 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1038 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1039 struct sock *sk = tcp_conn->sock->sk;
1041 /* assign new callbacks */
1042 write_lock_bh(&sk->sk_callback_lock);
1043 sk->sk_user_data = conn;
1044 tcp_conn->old_data_ready = sk->sk_data_ready;
1045 tcp_conn->old_state_change = sk->sk_state_change;
1046 tcp_conn->old_write_space = sk->sk_write_space;
1047 sk->sk_data_ready = iscsi_tcp_data_ready;
1048 sk->sk_state_change = iscsi_tcp_state_change;
1049 sk->sk_write_space = iscsi_write_space;
1050 write_unlock_bh(&sk->sk_callback_lock);
1054 iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
1056 struct sock *sk = tcp_conn->sock->sk;
1058 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1059 write_lock_bh(&sk->sk_callback_lock);
1060 sk->sk_user_data = NULL;
1061 sk->sk_data_ready = tcp_conn->old_data_ready;
1062 sk->sk_state_change = tcp_conn->old_state_change;
1063 sk->sk_write_space = tcp_conn->old_write_space;
1064 sk->sk_no_check = 0;
1065 write_unlock_bh(&sk->sk_callback_lock);
1069 * iscsi_send - generic send routine
1070 * @sk: kernel's socket
1071 * @buf: buffer to write from
1072 * @size: actual size to write
1073 * @flags: socket's flags
1076 iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
1078 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1079 struct socket *sk = tcp_conn->sock;
1080 int offset = buf->sg.offset + buf->sent, res;
1083 * if we got use_sg=0 or are sending something we kmallocd
1084 * then we did not have to do kmap (kmap returns page_address)
1086 * if we got use_sg > 0, but had to drop down, we do not
1087 * set clustering so this should only happen for that
1090 if (buf->use_sendmsg)
1091 res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
1093 res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
1096 conn->txdata_octets += res;
1101 tcp_conn->sendpage_failures_cnt++;
1105 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1110 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1111 * @conn: iscsi connection
1112 * @buf: buffer to write from
1113 * @datalen: lenght of data to be sent after the header
1119 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1121 int flags = 0; /* MSG_DONTWAIT; */
1124 size = buf->sg.length - buf->sent;
1125 BUG_ON(buf->sent + size > buf->sg.length);
1126 if (buf->sent + size != buf->sg.length || datalen)
1129 res = iscsi_send(conn, buf, size, flags);
1130 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1141 * iscsi_sendpage - send one page of iSCSI Data-Out.
1142 * @conn: iscsi connection
1143 * @buf: buffer to write from
1144 * @count: remaining data
1145 * @sent: number of bytes sent
1151 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1152 int *count, int *sent)
1154 int flags = 0; /* MSG_DONTWAIT; */
1157 size = buf->sg.length - buf->sent;
1158 BUG_ON(buf->sent + size > buf->sg.length);
1161 if (buf->sent + size != buf->sg.length || *count != size)
1164 res = iscsi_send(conn, buf, size, flags);
1165 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1166 size, buf->sent, *count, *sent, res);
1179 iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
1180 struct iscsi_cmd_task *ctask)
1182 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1184 BUG_ON(!tcp_conn->data_tx_tfm);
1185 crypto_digest_init(tcp_conn->data_tx_tfm);
1186 tcp_ctask->digest_count = 4;
1190 iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1191 struct iscsi_buf *buf, uint32_t *digest, int final)
1193 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1194 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1199 crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest);
1201 iscsi_buf_init_iov(buf, (char*)digest, 4);
1202 rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
1204 tcp_ctask->datadigest = *digest;
1205 tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST;
1207 tcp_ctask->digest_count = 4;
1212 * iscsi_solicit_data_cont - initialize next Data-Out
1213 * @conn: iscsi connection
1214 * @ctask: scsi command task
1216 * @left: bytes left to transfer
1219 * Initialize next Data-Out within this R2T sequence and continue
1220 * to process next Scatter-Gather element(if any) of this SCSI command.
1222 * Called under connection lock.
1225 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1226 struct iscsi_r2t_info *r2t, int left)
1228 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1229 struct iscsi_data *hdr;
1230 struct scsi_cmnd *sc = ctask->sc;
1233 hdr = &r2t->dtask.hdr;
1234 memset(hdr, 0, sizeof(struct iscsi_data));
1235 hdr->ttt = r2t->ttt;
1236 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1237 r2t->solicit_datasn++;
1238 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1239 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1240 hdr->itt = ctask->hdr->itt;
1241 hdr->exp_statsn = r2t->exp_statsn;
1242 new_offset = r2t->data_offset + r2t->sent;
1243 hdr->offset = cpu_to_be32(new_offset);
1244 if (left > conn->max_xmit_dlength) {
1245 hton24(hdr->dlength, conn->max_xmit_dlength);
1246 r2t->data_count = conn->max_xmit_dlength;
1248 hton24(hdr->dlength, left);
1249 r2t->data_count = left;
1250 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1252 conn->dataout_pdus_cnt++;
1254 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
1255 sizeof(struct iscsi_hdr));
1257 if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
1258 BUG_ON(tcp_ctask->bad_sg == r2t->sg);
1259 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1262 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
1263 (char*)sc->request_buffer + new_offset,
1268 iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1270 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1271 struct iscsi_data_task *dtask;
1273 dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask;
1274 iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr,
1275 tcp_ctask->r2t_data_count);
1276 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
1277 sizeof(struct iscsi_hdr));
1281 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1282 * @conn: iscsi connection
1283 * @ctask: scsi command task
1287 iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
1289 struct scsi_cmnd *sc = ctask->sc;
1290 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1292 BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
1294 tcp_ctask->sent = 0;
1295 tcp_ctask->sg_count = 0;
1297 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1298 tcp_ctask->xmstate = XMSTATE_W_HDR;
1299 tcp_ctask->exp_r2tsn = 0;
1300 BUG_ON(ctask->total_length == 0);
1303 struct scatterlist *sg = sc->request_buffer;
1305 iscsi_buf_init_sg(&tcp_ctask->sendbuf,
1306 &sg[tcp_ctask->sg_count++]);
1308 tcp_ctask->bad_sg = sg + sc->use_sg;
1310 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
1312 sc->request_bufflen);
1314 if (ctask->imm_count)
1315 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1317 tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
1318 if (tcp_ctask->pad_count) {
1319 tcp_ctask->pad_count = ISCSI_PAD_LEN -
1320 tcp_ctask->pad_count;
1321 debug_scsi("write padding %d bytes\n",
1322 tcp_ctask->pad_count);
1323 tcp_ctask->xmstate |= XMSTATE_W_PAD;
1326 if (ctask->unsol_count)
1327 tcp_ctask->xmstate |= XMSTATE_UNS_HDR |
1329 tcp_ctask->r2t_data_count = ctask->total_length -
1333 debug_scsi("cmd [itt 0x%x total %d imm %d imm_data %d "
1335 ctask->itt, ctask->total_length, ctask->imm_count,
1336 ctask->unsol_count, tcp_ctask->r2t_data_count);
1338 tcp_ctask->xmstate = XMSTATE_R_HDR;
1340 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
1341 sizeof(struct iscsi_hdr));
1345 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
1346 * @conn: iscsi connection
1347 * @mtask: task management task
1350 * The function can return -EAGAIN in which case caller must
1351 * call it again later, or recover. '0' return code means successful
1354 * Management xmit state machine consists of two states:
1355 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1356 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1359 iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1361 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1364 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1365 conn->id, tcp_mtask->xmstate, mtask->itt);
1367 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
1368 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
1369 if (mtask->data_count)
1370 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1371 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1372 conn->stop_stage != STOP_CONN_RECOVER &&
1374 iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
1375 (u8*)tcp_mtask->hdrext);
1376 rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
1379 tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
1380 if (mtask->data_count)
1381 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
1386 if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
1387 BUG_ON(!mtask->data_count);
1388 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
1389 /* FIXME: implement.
1390 * Virtual buffer could be spreaded across multiple pages...
1395 rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
1396 &mtask->data_count, &tcp_mtask->sent);
1398 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1401 } while (mtask->data_count);
1404 BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
1405 if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1406 struct iscsi_session *session = conn->session;
1408 spin_lock_bh(&session->lock);
1409 list_del(&conn->mtask->running);
1410 __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
1412 spin_unlock_bh(&session->lock);
1418 handle_xmstate_r_hdr(struct iscsi_conn *conn,
1419 struct iscsi_tcp_cmd_task *tcp_ctask)
1423 tcp_ctask->xmstate &= ~XMSTATE_R_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, 0);
1429 BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE);
1430 return 0; /* wait for Data-In */
1432 tcp_ctask->xmstate |= XMSTATE_R_HDR;
1437 handle_xmstate_w_hdr(struct iscsi_conn *conn,
1438 struct iscsi_cmd_task *ctask)
1440 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1443 tcp_ctask->xmstate &= ~XMSTATE_W_HDR;
1444 if (conn->hdrdgst_en)
1445 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1446 (u8*)tcp_ctask->hdrext);
1447 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
1449 tcp_ctask->xmstate |= XMSTATE_W_HDR;
1454 handle_xmstate_data_digest(struct iscsi_conn *conn,
1455 struct iscsi_cmd_task *ctask)
1457 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1460 tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
1461 debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest);
1462 rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf,
1463 &tcp_ctask->datadigest, 0);
1465 tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST;
1466 debug_tcp("resent data digest 0x%x fail!\n",
1467 tcp_ctask->datadigest);
1474 handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1476 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1477 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1480 BUG_ON(!ctask->imm_count);
1481 tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
1483 if (conn->datadgst_en) {
1484 iscsi_data_digest_init(tcp_conn, ctask);
1485 tcp_ctask->immdigest = 0;
1489 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf,
1490 &ctask->imm_count, &tcp_ctask->sent);
1492 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1493 if (conn->datadgst_en) {
1494 crypto_digest_final(tcp_conn->data_tx_tfm,
1495 (u8*)&tcp_ctask->immdigest);
1496 debug_tcp("tx imm sendpage fail 0x%x\n",
1497 tcp_ctask->datadigest);
1501 if (conn->datadgst_en)
1502 crypto_digest_update(tcp_conn->data_tx_tfm,
1503 &tcp_ctask->sendbuf.sg, 1);
1505 if (!ctask->imm_count)
1507 iscsi_buf_init_sg(&tcp_ctask->sendbuf,
1508 &tcp_ctask->sg[tcp_ctask->sg_count++]);
1511 if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) {
1512 rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf,
1513 &tcp_ctask->immdigest, 1);
1515 debug_tcp("sending imm digest 0x%x fail!\n",
1516 tcp_ctask->immdigest);
1519 debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest);
1526 handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1528 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1529 struct iscsi_data_task *dtask;
1532 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1533 if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
1534 iscsi_unsolicit_data_init(conn, ctask);
1535 dtask = tcp_ctask->dtask;
1536 if (conn->hdrdgst_en)
1537 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1538 (u8*)dtask->hdrext);
1539 tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
1542 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
1544 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1545 tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
1549 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1550 ctask->itt, ctask->unsol_count, tcp_ctask->sent);
1555 handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1557 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1558 struct iscsi_data_task *dtask = tcp_ctask->dtask;
1559 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1562 BUG_ON(!ctask->data_count);
1563 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1565 if (conn->datadgst_en) {
1566 iscsi_data_digest_init(tcp_conn, ctask);
1571 int start = tcp_ctask->sent;
1573 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf,
1574 &ctask->data_count, &tcp_ctask->sent);
1576 ctask->unsol_count -= tcp_ctask->sent - start;
1577 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1578 /* will continue with this ctask later.. */
1579 if (conn->datadgst_en) {
1580 crypto_digest_final(tcp_conn->data_tx_tfm,
1581 (u8 *)&dtask->digest);
1582 debug_tcp("tx uns data fail 0x%x\n",
1588 BUG_ON(tcp_ctask->sent > ctask->total_length);
1589 ctask->unsol_count -= tcp_ctask->sent - start;
1592 * XXX:we may run here with un-initial sendbuf.
1595 if (conn->datadgst_en && tcp_ctask->sent - start > 0)
1596 crypto_digest_update(tcp_conn->data_tx_tfm,
1597 &tcp_ctask->sendbuf.sg, 1);
1599 if (!ctask->data_count)
1601 iscsi_buf_init_sg(&tcp_ctask->sendbuf,
1602 &tcp_ctask->sg[tcp_ctask->sg_count++]);
1604 BUG_ON(ctask->unsol_count < 0);
1607 * Done with the Data-Out. Next, check if we need
1608 * to send another unsolicited Data-Out.
1610 if (ctask->unsol_count) {
1611 if (conn->datadgst_en) {
1612 rc = iscsi_digest_final_send(conn, ctask,
1616 debug_tcp("send uns digest 0x%x fail\n",
1620 debug_tcp("sending uns digest 0x%x, more uns\n",
1623 tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
1627 if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) {
1628 rc = iscsi_digest_final_send(conn, ctask,
1632 debug_tcp("send last uns digest 0x%x fail\n",
1636 debug_tcp("sending uns digest 0x%x\n",dtask->digest);
1643 handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1645 struct iscsi_session *session = conn->session;
1646 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1647 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1648 struct iscsi_r2t_info *r2t = tcp_ctask->r2t;
1649 struct iscsi_data_task *dtask = &r2t->dtask;
1652 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1653 tcp_ctask->dtask = dtask;
1655 if (conn->datadgst_en) {
1656 iscsi_data_digest_init(tcp_conn, ctask);
1661 * send Data-Out within this R2T sequence.
1663 if (!r2t->data_count)
1666 rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent);
1668 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1669 /* will continue with this ctask later.. */
1670 if (conn->datadgst_en) {
1671 crypto_digest_final(tcp_conn->data_tx_tfm,
1672 (u8 *)&dtask->digest);
1673 debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
1678 BUG_ON(r2t->data_count < 0);
1679 if (conn->datadgst_en)
1680 crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg,
1683 if (r2t->data_count) {
1684 BUG_ON(ctask->sc->use_sg == 0);
1685 if (!iscsi_buf_left(&r2t->sendbuf)) {
1686 BUG_ON(tcp_ctask->bad_sg == r2t->sg);
1687 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1695 * Done with this Data-Out. Next, check if we have
1696 * to send another Data-Out for this R2T.
1698 BUG_ON(r2t->data_length - r2t->sent < 0);
1699 left = r2t->data_length - r2t->sent;
1701 if (conn->datadgst_en) {
1702 rc = iscsi_digest_final_send(conn, ctask,
1706 debug_tcp("send r2t data digest 0x%x"
1707 "fail\n", dtask->digest);
1710 debug_tcp("r2t data send digest 0x%x\n",
1713 iscsi_solicit_data_cont(conn, ctask, r2t, left);
1714 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1715 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1720 * Done with this R2T. Check if there are more
1721 * outstanding R2Ts ready to be processed.
1723 BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0);
1724 if (conn->datadgst_en) {
1725 rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
1728 debug_tcp("send last r2t data digest 0x%x"
1729 "fail\n", dtask->digest);
1732 debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
1735 tcp_ctask->r2t_data_count -= r2t->data_length;
1736 tcp_ctask->r2t = NULL;
1737 spin_lock_bh(&session->lock);
1738 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
1739 spin_unlock_bh(&session->lock);
1740 if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
1741 tcp_ctask->r2t = r2t;
1742 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1743 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1751 handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1753 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1754 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1755 struct iscsi_data_task *dtask = tcp_ctask->dtask;
1758 tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
1759 iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
1760 tcp_ctask->pad_count);
1761 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
1764 tcp_ctask->xmstate |= XMSTATE_W_PAD;
1768 if (conn->datadgst_en) {
1769 crypto_digest_update(tcp_conn->data_tx_tfm,
1770 &tcp_ctask->sendbuf.sg, 1);
1773 rc = iscsi_digest_final_send(conn, ctask,
1775 &tcp_ctask->immdigest, 1);
1777 debug_tcp("send padding digest 0x%x"
1778 "fail!\n", tcp_ctask->immdigest);
1781 debug_tcp("done with padding, digest 0x%x\n",
1782 tcp_ctask->datadigest);
1784 rc = iscsi_digest_final_send(conn, ctask,
1788 debug_tcp("send padding digest 0x%x"
1789 "fail\n", dtask->digest);
1792 debug_tcp("done with padding, digest 0x%x\n",
1801 iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1803 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1806 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
1807 conn->id, tcp_ctask->xmstate, ctask->itt);
1810 * serialize with TMF AbortTask
1815 if (tcp_ctask->xmstate & XMSTATE_R_HDR)
1816 return handle_xmstate_r_hdr(conn, tcp_ctask);
1818 if (tcp_ctask->xmstate & XMSTATE_W_HDR) {
1819 rc = handle_xmstate_w_hdr(conn, ctask);
1824 /* XXX: for data digest xmit recover */
1825 if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) {
1826 rc = handle_xmstate_data_digest(conn, ctask);
1831 if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
1832 rc = handle_xmstate_imm_data(conn, ctask);
1837 if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
1838 BUG_ON(!ctask->unsol_count);
1839 tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
1840 unsolicit_head_again:
1841 rc = handle_xmstate_uns_hdr(conn, ctask);
1846 if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
1847 rc = handle_xmstate_uns_data(conn, ctask);
1849 goto unsolicit_head_again;
1855 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
1856 struct iscsi_r2t_info *r2t;
1858 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1859 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1860 if (!tcp_ctask->r2t)
1861 __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
1864 r2t = tcp_ctask->r2t;
1865 if (conn->hdrdgst_en)
1866 iscsi_hdr_digest(conn, &r2t->headbuf,
1867 (u8*)r2t->dtask.hdrext);
1868 rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
1870 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1871 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
1875 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1876 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
1880 if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
1881 rc = handle_xmstate_sol_data(conn, ctask);
1883 goto solicit_head_again;
1890 * Last thing to check is whether we need to send write
1891 * padding. Note that we check for xmstate equality, not just the bit.
1893 if (tcp_ctask->xmstate == XMSTATE_W_PAD)
1894 rc = handle_xmstate_w_pad(conn, ctask);
1899 static struct iscsi_cls_conn *
1900 iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1902 struct iscsi_conn *conn;
1903 struct iscsi_cls_conn *cls_conn;
1904 struct iscsi_tcp_conn *tcp_conn;
1906 cls_conn = iscsi_conn_setup(cls_session, conn_idx);
1909 conn = cls_conn->dd_data;
1911 * due to strange issues with iser these are not set
1912 * in iscsi_conn_setup
1914 conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
1916 tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
1918 goto tcp_conn_alloc_fail;
1920 conn->dd_data = tcp_conn;
1921 tcp_conn->iscsi_conn = conn;
1922 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1923 /* initial operational parameters */
1924 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
1928 tcp_conn_alloc_fail:
1929 iscsi_conn_teardown(cls_conn);
1934 iscsi_tcp_release_conn(struct iscsi_conn *conn)
1936 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1938 if (!tcp_conn->sock)
1941 sock_hold(tcp_conn->sock->sk);
1942 iscsi_conn_restore_callbacks(tcp_conn);
1943 sock_put(tcp_conn->sock->sk);
1945 sock_release(tcp_conn->sock);
1946 tcp_conn->sock = NULL;
1947 conn->recv_lock = NULL;
1951 iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
1953 struct iscsi_conn *conn = cls_conn->dd_data;
1954 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1957 if (conn->hdrdgst_en || conn->datadgst_en)
1960 iscsi_tcp_release_conn(conn);
1961 iscsi_conn_teardown(cls_conn);
1963 /* now free tcp_conn */
1965 if (tcp_conn->tx_tfm)
1966 crypto_free_tfm(tcp_conn->tx_tfm);
1967 if (tcp_conn->rx_tfm)
1968 crypto_free_tfm(tcp_conn->rx_tfm);
1969 if (tcp_conn->data_tx_tfm)
1970 crypto_free_tfm(tcp_conn->data_tx_tfm);
1971 if (tcp_conn->data_rx_tfm)
1972 crypto_free_tfm(tcp_conn->data_rx_tfm);
1979 iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1981 struct iscsi_conn *conn = cls_conn->dd_data;
1983 iscsi_conn_stop(cls_conn, flag);
1984 iscsi_tcp_release_conn(conn);
1988 iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
1989 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
1992 struct iscsi_conn *conn = cls_conn->dd_data;
1993 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1995 struct socket *sock;
1998 /* lookup for existing socket */
1999 sock = sockfd_lookup((int)transport_eph, &err);
2001 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
2005 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2009 /* bind iSCSI connection and socket */
2010 tcp_conn->sock = sock;
2012 /* setup Socket parameters */
2015 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
2016 sk->sk_allocation = GFP_ATOMIC;
2018 /* FIXME: disable Nagle's algorithm */
2021 * Intercept TCP callbacks for sendfile like receive
2024 conn->recv_lock = &sk->sk_callback_lock;
2025 iscsi_conn_set_callbacks(conn);
2026 tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
2028 * set receive state machine into initial state
2030 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
2035 /* called with host lock */
2037 iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask,
2038 char *data, uint32_t data_size)
2040 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2042 iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
2043 sizeof(struct iscsi_hdr));
2044 tcp_mtask->xmstate = XMSTATE_IMM_HDR;
2045 tcp_mtask->sent = 0;
2047 if (mtask->data_count)
2048 iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data,
2053 iscsi_r2tpool_alloc(struct iscsi_session *session)
2059 * initialize per-task: R2T pool and xmit queue
2061 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2062 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2063 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2066 * pre-allocated x4 as much r2ts to handle race when
2067 * target acks DataOut faster than we data_xmit() queues
2068 * could replenish r2tqueue.
2072 if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
2073 (void***)&tcp_ctask->r2ts,
2074 sizeof(struct iscsi_r2t_info))) {
2075 goto r2t_alloc_fail;
2078 /* R2T xmit queue */
2079 tcp_ctask->r2tqueue = kfifo_alloc(
2080 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
2081 if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
2082 iscsi_pool_free(&tcp_ctask->r2tpool,
2083 (void**)tcp_ctask->r2ts);
2084 goto r2t_alloc_fail;
2091 for (i = 0; i < cmd_i; i++) {
2092 struct iscsi_cmd_task *ctask = session->cmds[i];
2093 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2095 kfifo_free(tcp_ctask->r2tqueue);
2096 iscsi_pool_free(&tcp_ctask->r2tpool,
2097 (void**)tcp_ctask->r2ts);
2103 iscsi_r2tpool_free(struct iscsi_session *session)
2107 for (i = 0; i < session->cmds_max; i++) {
2108 struct iscsi_cmd_task *ctask = session->cmds[i];
2109 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2111 kfifo_free(tcp_ctask->r2tqueue);
2112 iscsi_pool_free(&tcp_ctask->r2tpool,
2113 (void**)tcp_ctask->r2ts);
2118 iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
2119 char *buf, int buflen)
2121 struct iscsi_conn *conn = cls_conn->dd_data;
2122 struct iscsi_session *session = conn->session;
2123 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2127 case ISCSI_PARAM_HDRDGST_EN:
2128 iscsi_set_param(cls_conn, param, buf, buflen);
2129 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
2130 if (conn->hdrdgst_en) {
2131 tcp_conn->hdr_size += sizeof(__u32);
2132 if (!tcp_conn->tx_tfm)
2133 tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c",
2135 if (!tcp_conn->tx_tfm)
2137 if (!tcp_conn->rx_tfm)
2138 tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c",
2140 if (!tcp_conn->rx_tfm) {
2141 crypto_free_tfm(tcp_conn->tx_tfm);
2145 if (tcp_conn->tx_tfm)
2146 crypto_free_tfm(tcp_conn->tx_tfm);
2147 if (tcp_conn->rx_tfm)
2148 crypto_free_tfm(tcp_conn->rx_tfm);
2151 case ISCSI_PARAM_DATADGST_EN:
2152 iscsi_set_param(cls_conn, param, buf, buflen);
2153 if (conn->datadgst_en) {
2154 if (!tcp_conn->data_tx_tfm)
2155 tcp_conn->data_tx_tfm =
2156 crypto_alloc_tfm("crc32c", 0);
2157 if (!tcp_conn->data_tx_tfm)
2159 if (!tcp_conn->data_rx_tfm)
2160 tcp_conn->data_rx_tfm =
2161 crypto_alloc_tfm("crc32c", 0);
2162 if (!tcp_conn->data_rx_tfm) {
2163 crypto_free_tfm(tcp_conn->data_tx_tfm);
2167 if (tcp_conn->data_tx_tfm)
2168 crypto_free_tfm(tcp_conn->data_tx_tfm);
2169 if (tcp_conn->data_rx_tfm)
2170 crypto_free_tfm(tcp_conn->data_rx_tfm);
2172 tcp_conn->sendpage = conn->datadgst_en ?
2173 sock_no_sendpage : tcp_conn->sock->ops->sendpage;
2175 case ISCSI_PARAM_MAX_R2T:
2176 sscanf(buf, "%d", &value);
2177 if (session->max_r2t == roundup_pow_of_two(value))
2179 iscsi_r2tpool_free(session);
2180 iscsi_set_param(cls_conn, param, buf, buflen);
2181 if (session->max_r2t & (session->max_r2t - 1))
2182 session->max_r2t = roundup_pow_of_two(session->max_r2t);
2183 if (iscsi_r2tpool_alloc(session))
2187 return iscsi_set_param(cls_conn, param, buf, buflen);
2194 iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
2195 enum iscsi_param param, char *buf)
2197 struct iscsi_conn *conn = cls_conn->dd_data;
2198 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2199 struct inet_sock *inet;
2200 struct ipv6_pinfo *np;
2205 case ISCSI_PARAM_CONN_PORT:
2206 mutex_lock(&conn->xmitmutex);
2207 if (!tcp_conn->sock) {
2208 mutex_unlock(&conn->xmitmutex);
2212 inet = inet_sk(tcp_conn->sock->sk);
2213 len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport));
2214 mutex_unlock(&conn->xmitmutex);
2216 case ISCSI_PARAM_CONN_ADDRESS:
2217 mutex_lock(&conn->xmitmutex);
2218 if (!tcp_conn->sock) {
2219 mutex_unlock(&conn->xmitmutex);
2223 sk = tcp_conn->sock->sk;
2224 if (sk->sk_family == PF_INET) {
2226 len = sprintf(buf, "%u.%u.%u.%u\n",
2227 NIPQUAD(inet->daddr));
2231 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
2234 mutex_unlock(&conn->xmitmutex);
2237 return iscsi_conn_get_param(cls_conn, param, buf);
2244 iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
2246 struct iscsi_conn *conn = cls_conn->dd_data;
2247 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2249 stats->txdata_octets = conn->txdata_octets;
2250 stats->rxdata_octets = conn->rxdata_octets;
2251 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2252 stats->dataout_pdus = conn->dataout_pdus_cnt;
2253 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2254 stats->datain_pdus = conn->datain_pdus_cnt;
2255 stats->r2t_pdus = conn->r2t_pdus_cnt;
2256 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2257 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2258 stats->custom_length = 3;
2259 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
2260 stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
2261 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
2262 stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
2263 strcpy(stats->custom[2].desc, "eh_abort_cnt");
2264 stats->custom[2].value = conn->eh_abort_cnt;
2267 static struct iscsi_cls_session *
2268 iscsi_tcp_session_create(struct iscsi_transport *iscsit,
2269 struct scsi_transport_template *scsit,
2270 uint32_t initial_cmdsn, uint32_t *hostno)
2272 struct iscsi_cls_session *cls_session;
2273 struct iscsi_session *session;
2277 cls_session = iscsi_session_setup(iscsit, scsit,
2278 sizeof(struct iscsi_tcp_cmd_task),
2279 sizeof(struct iscsi_tcp_mgmt_task),
2280 initial_cmdsn, &hn);
2285 session = class_to_transport_session(cls_session);
2286 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2287 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2288 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2290 ctask->hdr = &tcp_ctask->hdr;
2293 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
2294 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
2295 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2297 mtask->hdr = &tcp_mtask->hdr;
2300 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
2301 goto r2tpool_alloc_fail;
2306 iscsi_session_teardown(cls_session);
2310 static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
2312 iscsi_r2tpool_free(class_to_transport_session(cls_session));
2313 iscsi_session_teardown(cls_session);
2316 static struct scsi_host_template iscsi_sht = {
2317 .name = "iSCSI Initiator over TCP/IP",
2318 .queuecommand = iscsi_queuecommand,
2319 .change_queue_depth = iscsi_change_queue_depth,
2320 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
2321 .sg_tablesize = ISCSI_SG_TABLESIZE,
2322 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
2323 .eh_abort_handler = iscsi_eh_abort,
2324 .eh_host_reset_handler = iscsi_eh_host_reset,
2325 .use_clustering = DISABLE_CLUSTERING,
2326 .proc_name = "iscsi_tcp",
2330 static struct iscsi_transport iscsi_tcp_transport = {
2331 .owner = THIS_MODULE,
2333 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
2335 .param_mask = ISCSI_MAX_RECV_DLENGTH |
2336 ISCSI_MAX_XMIT_DLENGTH |
2339 ISCSI_INITIAL_R2T_EN |
2344 ISCSI_PDU_INORDER_EN |
2345 ISCSI_DATASEQ_INORDER_EN |
2348 ISCSI_CONN_ADDRESS |
2350 ISCSI_PERSISTENT_PORT |
2351 ISCSI_PERSISTENT_ADDRESS |
2354 .host_template = &iscsi_sht,
2355 .conndata_size = sizeof(struct iscsi_conn),
2357 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
2358 /* session management */
2359 .create_session = iscsi_tcp_session_create,
2360 .destroy_session = iscsi_tcp_session_destroy,
2361 /* connection management */
2362 .create_conn = iscsi_tcp_conn_create,
2363 .bind_conn = iscsi_tcp_conn_bind,
2364 .destroy_conn = iscsi_tcp_conn_destroy,
2365 .set_param = iscsi_conn_set_param,
2366 .get_conn_param = iscsi_tcp_conn_get_param,
2367 .get_session_param = iscsi_session_get_param,
2368 .start_conn = iscsi_conn_start,
2369 .stop_conn = iscsi_tcp_conn_stop,
2371 .send_pdu = iscsi_conn_send_pdu,
2372 .get_stats = iscsi_conn_get_stats,
2373 .init_cmd_task = iscsi_tcp_cmd_init,
2374 .init_mgmt_task = iscsi_tcp_mgmt_init,
2375 .xmit_cmd_task = iscsi_tcp_ctask_xmit,
2376 .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
2377 .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
2379 .session_recovery_timedout = iscsi_session_recovery_timedout,
2383 iscsi_tcp_init(void)
2385 if (iscsi_max_lun < 1) {
2386 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
2390 iscsi_tcp_transport.max_lun = iscsi_max_lun;
2392 if (!iscsi_register_transport(&iscsi_tcp_transport))
2399 iscsi_tcp_exit(void)
2401 iscsi_unregister_transport(&iscsi_tcp_transport);
2404 module_init(iscsi_tcp_init);
2405 module_exit(iscsi_tcp_exit);