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;
285 hdr = &r2t->dtask.hdr;
286 memset(hdr, 0, sizeof(struct iscsi_data));
288 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
289 r2t->solicit_datasn++;
290 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
291 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
292 hdr->itt = ctask->hdr->itt;
293 hdr->exp_statsn = r2t->exp_statsn;
294 hdr->offset = cpu_to_be32(r2t->data_offset);
295 if (r2t->data_length > conn->max_xmit_dlength) {
296 hton24(hdr->dlength, conn->max_xmit_dlength);
297 r2t->data_count = conn->max_xmit_dlength;
300 hton24(hdr->dlength, r2t->data_length);
301 r2t->data_count = r2t->data_length;
302 hdr->flags = ISCSI_FLAG_CMD_FINAL;
304 conn->dataout_pdus_cnt++;
308 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
309 sizeof(struct iscsi_hdr));
313 struct scatterlist *sg = sc->request_buffer;
316 for (i = 0; i < sc->use_sg; i++, sg += 1) {
317 /* FIXME: prefetch ? */
318 if (sg_count + sg->length > r2t->data_offset) {
323 /* offset within this page */
324 page_offset = r2t->data_offset - sg_count;
326 /* fill in this buffer */
327 iscsi_buf_init_sg(&r2t->sendbuf, sg);
328 r2t->sendbuf.sg.offset += page_offset;
329 r2t->sendbuf.sg.length -= page_offset;
331 /* xmit logic will continue with next one */
335 sg_count += sg->length;
337 BUG_ON(r2t->sg == NULL);
339 iscsi_buf_init_iov(&r2t->sendbuf,
340 (char*)sc->request_buffer + r2t->data_offset,
347 * iscsi_r2t_rsp - iSCSI R2T Response processing
348 * @conn: iscsi connection
349 * @ctask: scsi command task
352 iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
354 struct iscsi_r2t_info *r2t;
355 struct iscsi_session *session = conn->session;
356 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
357 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
358 struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
359 int r2tsn = be32_to_cpu(rhdr->r2tsn);
362 if (tcp_conn->in.datalen) {
363 printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n",
364 tcp_conn->in.datalen);
365 return ISCSI_ERR_DATALEN;
368 if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn)
369 return ISCSI_ERR_R2TSN;
371 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
375 /* FIXME: use R2TSN to detect missing R2T */
377 /* fill-in new R2T associated with the task */
378 spin_lock(&session->lock);
379 if (!ctask->sc || ctask->mtask ||
380 session->state != ISCSI_STATE_LOGGED_IN) {
381 printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
382 "recovery...\n", ctask->itt);
383 spin_unlock(&session->lock);
387 rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
390 r2t->exp_statsn = rhdr->statsn;
391 r2t->data_length = be32_to_cpu(rhdr->data_length);
392 if (r2t->data_length == 0) {
393 printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
394 spin_unlock(&session->lock);
395 return ISCSI_ERR_DATALEN;
398 if (r2t->data_length > session->max_burst)
399 debug_scsi("invalid R2T with data len %u and max burst %u."
400 "Attempting to execute request.\n",
401 r2t->data_length, session->max_burst);
403 r2t->data_offset = be32_to_cpu(rhdr->data_offset);
404 if (r2t->data_offset + r2t->data_length > ctask->total_length) {
405 spin_unlock(&session->lock);
406 printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
407 "offset %u and total length %d\n", r2t->data_length,
408 r2t->data_offset, ctask->total_length);
409 return ISCSI_ERR_DATALEN;
412 r2t->ttt = rhdr->ttt; /* no flip */
413 r2t->solicit_datasn = 0;
415 iscsi_solicit_data_init(conn, ctask, r2t);
417 tcp_ctask->exp_r2tsn = r2tsn + 1;
418 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
419 __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
420 list_move_tail(&ctask->running, &conn->xmitqueue);
422 scsi_queue_work(session->host, &conn->xmitwork);
423 conn->r2t_pdus_cnt++;
424 spin_unlock(&session->lock);
430 iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
432 int rc = 0, opcode, ahslen;
433 struct iscsi_hdr *hdr;
434 struct iscsi_session *session = conn->session;
435 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
436 uint32_t cdgst, rdgst = 0, itt;
438 hdr = tcp_conn->in.hdr;
440 /* verify PDU length */
441 tcp_conn->in.datalen = ntoh24(hdr->dlength);
442 if (tcp_conn->in.datalen > conn->max_recv_dlength) {
443 printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
444 tcp_conn->in.datalen, conn->max_recv_dlength);
445 return ISCSI_ERR_DATALEN;
447 tcp_conn->data_copied = 0;
450 ahslen = hdr->hlength << 2;
451 tcp_conn->in.offset += ahslen;
452 tcp_conn->in.copy -= ahslen;
453 if (tcp_conn->in.copy < 0) {
454 printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
455 "%d bytes\n", ahslen);
456 return ISCSI_ERR_AHSLEN;
459 /* calculate read padding */
460 tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
461 if (tcp_conn->in.padding) {
462 tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
463 debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
466 if (conn->hdrdgst_en) {
467 struct scatterlist sg;
469 sg_init_one(&sg, (u8 *)hdr,
470 sizeof(struct iscsi_hdr) + ahslen);
471 crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
472 rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
474 if (cdgst != rdgst) {
475 printk(KERN_ERR "iscsi_tcp: hdrdgst error "
476 "recv 0x%x calc 0x%x\n", rdgst, cdgst);
477 return ISCSI_ERR_HDR_DGST;
481 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
482 /* verify itt (itt encoding: age+cid+itt) */
483 rc = iscsi_verify_itt(conn, hdr, &itt);
484 if (rc == ISCSI_ERR_NO_SCSI_CMD) {
485 tcp_conn->in.datalen = 0; /* force drop */
490 debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
491 opcode, tcp_conn->in.offset, tcp_conn->in.copy,
492 ahslen, tcp_conn->in.datalen);
495 case ISCSI_OP_SCSI_DATA_IN:
496 tcp_conn->in.ctask = session->cmds[itt];
497 rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
501 case ISCSI_OP_SCSI_CMD_RSP:
502 tcp_conn->in.ctask = session->cmds[itt];
503 if (tcp_conn->in.datalen)
506 spin_lock(&session->lock);
507 rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
508 spin_unlock(&session->lock);
511 tcp_conn->in.ctask = session->cmds[itt];
513 rc = ISCSI_ERR_AHSLEN;
514 else if (tcp_conn->in.ctask->sc->sc_data_direction ==
516 rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
518 rc = ISCSI_ERR_PROTO;
520 case ISCSI_OP_LOGIN_RSP:
521 case ISCSI_OP_TEXT_RSP:
522 case ISCSI_OP_REJECT:
523 case ISCSI_OP_ASYNC_EVENT:
525 * It is possible that we could get a PDU with a buffer larger
526 * than 8K, but there are no targets that currently do this.
527 * For now we fail until we find a vendor that needs it
529 if (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH <
530 tcp_conn->in.datalen) {
531 printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
532 "but conn buffer is only %u (opcode %0x)\n",
533 tcp_conn->in.datalen,
534 DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, opcode);
535 rc = ISCSI_ERR_PROTO;
539 if (tcp_conn->in.datalen)
542 case ISCSI_OP_LOGOUT_RSP:
543 case ISCSI_OP_NOOP_IN:
544 case ISCSI_OP_SCSI_TMFUNC_RSP:
545 rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
548 rc = ISCSI_ERR_BAD_OPCODE;
556 * if we did zero copy for the header but we will need multiple
557 * skbs to complete the command then we have to copy the header
560 if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
561 (tcp_conn->in.datalen + tcp_conn->in.padding +
562 (conn->datadgst_en ? 4 : 0))) {
563 debug_tcp("Copying header for later use. in.copy %d in.datalen"
564 " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
565 memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
566 sizeof(struct iscsi_hdr));
567 tcp_conn->in.hdr = &tcp_conn->hdr;
568 tcp_conn->in.zero_copy_hdr = 0;
574 * iscsi_ctask_copy - copy skb bits to the destanation cmd task
575 * @conn: iscsi tcp connection
576 * @ctask: scsi command task
577 * @buf: buffer to copy to
578 * @buf_size: size of buffer
579 * @offset: offset within the buffer
582 * The function calls skb_copy_bits() and updates per-connection and
583 * per-cmd byte counters.
585 * Read counters (in bytes):
587 * conn->in.offset offset within in progress SKB
588 * conn->in.copy left to copy from in progress SKB
590 * conn->in.copied copied already from in progress SKB
591 * conn->data_copied copied already from in progress buffer
592 * ctask->sent total bytes sent up to the MidLayer
593 * ctask->data_count left to copy from in progress Data-In
594 * buf_left left to copy from in progress buffer
597 iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
598 void *buf, int buf_size, int offset)
600 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
601 int buf_left = buf_size - (tcp_conn->data_copied + offset);
602 int size = min(tcp_conn->in.copy, buf_left);
605 size = min(size, ctask->data_count);
607 debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
608 size, tcp_conn->in.offset, tcp_conn->in.copied);
611 BUG_ON(tcp_ctask->sent + size > ctask->total_length);
613 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
614 (char*)buf + (offset + tcp_conn->data_copied), size);
615 /* must fit into skb->len */
618 tcp_conn->in.offset += size;
619 tcp_conn->in.copy -= size;
620 tcp_conn->in.copied += size;
621 tcp_conn->data_copied += size;
622 tcp_ctask->sent += size;
623 ctask->data_count -= size;
625 BUG_ON(tcp_conn->in.copy < 0);
626 BUG_ON(ctask->data_count < 0);
628 if (buf_size != (tcp_conn->data_copied + offset)) {
629 if (!ctask->data_count) {
630 BUG_ON(buf_size - tcp_conn->data_copied < 0);
631 /* done with this PDU */
632 return buf_size - tcp_conn->data_copied;
637 /* done with this buffer or with both - PDU and buffer */
638 tcp_conn->data_copied = 0;
643 * iscsi_tcp_copy - copy skb bits to the destanation buffer
644 * @conn: iscsi tcp connection
647 * The function calls skb_copy_bits() and updates per-connection
651 iscsi_tcp_copy(struct iscsi_conn *conn)
653 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
654 int buf_size = tcp_conn->in.datalen;
655 int buf_left = buf_size - tcp_conn->data_copied;
656 int size = min(tcp_conn->in.copy, buf_left);
659 debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
660 size, tcp_conn->in.offset, tcp_conn->data_copied);
663 rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
664 (char*)conn->data + tcp_conn->data_copied, size);
667 tcp_conn->in.offset += size;
668 tcp_conn->in.copy -= size;
669 tcp_conn->in.copied += size;
670 tcp_conn->data_copied += size;
672 if (buf_size != tcp_conn->data_copied)
679 partial_sg_digest_update(struct crypto_tfm *tfm, struct scatterlist *sg,
680 int offset, int length)
682 struct scatterlist temp;
684 memcpy(&temp, sg, sizeof(struct scatterlist));
685 temp.offset = offset;
686 temp.length = length;
687 crypto_digest_update(tfm, &temp, 1);
691 iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
693 struct scatterlist tmp;
695 sg_init_one(&tmp, buf, len);
696 crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1);
699 static int iscsi_scsi_data_in(struct iscsi_conn *conn)
701 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
702 struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
703 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
704 struct scsi_cmnd *sc = ctask->sc;
705 struct scatterlist *sg;
706 int i, offset, rc = 0;
708 BUG_ON((void*)ctask != sc->SCp.ptr);
711 * copying Data-In into the Scsi_Cmnd
714 i = ctask->data_count;
715 rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
717 tcp_ctask->data_offset);
720 if (conn->datadgst_en)
721 iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
727 offset = tcp_ctask->data_offset;
728 sg = sc->request_buffer;
730 if (tcp_ctask->data_offset)
731 for (i = 0; i < tcp_ctask->sg_count; i++)
732 offset -= sg[i].length;
733 /* we've passed through partial sg*/
737 for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
740 dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
741 rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
742 sg[i].length, offset);
743 kunmap_atomic(dest, KM_SOFTIRQ0);
745 /* continue with the next SKB/PDU */
748 if (conn->datadgst_en) {
750 crypto_digest_update(
751 tcp_conn->data_rx_tfm,
754 partial_sg_digest_update(
755 tcp_conn->data_rx_tfm,
757 sg[i].offset + offset,
758 sg[i].length - offset);
761 tcp_ctask->sg_count++;
764 if (!ctask->data_count) {
765 if (rc && conn->datadgst_en)
767 * data-in is complete, but buffer not...
769 partial_sg_digest_update(tcp_conn->data_rx_tfm,
771 sg[i].offset, sg[i].length-rc);
776 if (!tcp_conn->in.copy)
779 BUG_ON(ctask->data_count);
782 /* check for non-exceptional status */
783 if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
784 debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
785 (long)sc, sc->result, ctask->itt,
786 tcp_conn->in.hdr->flags);
787 spin_lock(&conn->session->lock);
788 __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
789 spin_unlock(&conn->session->lock);
796 iscsi_data_recv(struct iscsi_conn *conn)
798 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
801 opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
803 case ISCSI_OP_SCSI_DATA_IN:
804 rc = iscsi_scsi_data_in(conn);
806 case ISCSI_OP_SCSI_CMD_RSP:
807 case ISCSI_OP_TEXT_RSP:
808 case ISCSI_OP_LOGIN_RSP:
809 case ISCSI_OP_ASYNC_EVENT:
810 case ISCSI_OP_REJECT:
812 * Collect data segment to the connection's data
815 if (iscsi_tcp_copy(conn)) {
820 rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
821 tcp_conn->in.datalen);
822 if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
823 iscsi_recv_digest_update(tcp_conn, conn->data,
824 tcp_conn->in.datalen);
834 * iscsi_tcp_data_recv - TCP receive in sendfile fashion
835 * @rd_desc: read descriptor
836 * @skb: socket buffer
837 * @offset: offset in skb
838 * @len: skb->len - offset
841 iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
842 unsigned int offset, size_t len)
845 struct iscsi_conn *conn = rd_desc->arg.data;
846 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
848 char pad[ISCSI_PAD_LEN];
849 struct scatterlist sg;
852 * Save current SKB and its offset in the corresponding
853 * connection context.
855 tcp_conn->in.copy = skb->len - offset;
856 tcp_conn->in.offset = offset;
857 tcp_conn->in.skb = skb;
858 tcp_conn->in.len = tcp_conn->in.copy;
859 BUG_ON(tcp_conn->in.copy <= 0);
860 debug_tcp("in %d bytes\n", tcp_conn->in.copy);
863 tcp_conn->in.copied = 0;
866 if (unlikely(conn->suspend_rx)) {
867 debug_tcp("conn %d Rx suspended!\n", conn->id);
871 if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
872 tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
873 rc = iscsi_hdr_extract(tcp_conn);
878 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
884 * Verify and process incoming PDU header.
886 rc = iscsi_tcp_hdr_recv(conn);
887 if (!rc && tcp_conn->in.datalen) {
888 if (conn->datadgst_en) {
889 BUG_ON(!tcp_conn->data_rx_tfm);
890 crypto_digest_init(tcp_conn->data_rx_tfm);
892 tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
894 iscsi_conn_failure(conn, rc);
899 if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
900 uint32_t recv_digest;
902 debug_tcp("extra data_recv offset %d copy %d\n",
903 tcp_conn->in.offset, tcp_conn->in.copy);
904 skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
906 tcp_conn->in.offset += 4;
907 tcp_conn->in.copy -= 4;
908 if (recv_digest != tcp_conn->in.datadgst) {
909 debug_tcp("iscsi_tcp: data digest error!"
910 "0x%x != 0x%x\n", recv_digest,
911 tcp_conn->in.datadgst);
912 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
915 debug_tcp("iscsi_tcp: data digest match!"
916 "0x%x == 0x%x\n", recv_digest,
917 tcp_conn->in.datadgst);
918 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
922 if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
925 debug_tcp("data_recv offset %d copy %d\n",
926 tcp_conn->in.offset, tcp_conn->in.copy);
928 rc = iscsi_data_recv(conn);
932 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
935 tcp_conn->in.copy -= tcp_conn->in.padding;
936 tcp_conn->in.offset += tcp_conn->in.padding;
937 if (conn->datadgst_en) {
938 if (tcp_conn->in.padding) {
939 debug_tcp("padding -> %d\n",
940 tcp_conn->in.padding);
941 memset(pad, 0, tcp_conn->in.padding);
942 sg_init_one(&sg, pad, tcp_conn->in.padding);
943 crypto_digest_update(tcp_conn->data_rx_tfm,
946 crypto_digest_final(tcp_conn->data_rx_tfm,
947 (u8 *) & tcp_conn->in.datadgst);
948 debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
949 tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
951 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
954 debug_tcp("f, processed %d from out of %d padding %d\n",
955 tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
956 BUG_ON(tcp_conn->in.offset - offset > len);
958 if (tcp_conn->in.offset - offset != len) {
959 debug_tcp("continue to process %d bytes\n",
960 (int)len - (tcp_conn->in.offset - offset));
965 processed = tcp_conn->in.offset - offset;
966 BUG_ON(processed == 0);
970 processed = tcp_conn->in.offset - offset;
971 debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
972 processed, (int)len, (int)rd_desc->count);
973 BUG_ON(processed == 0);
974 BUG_ON(processed > len);
976 conn->rxdata_octets += processed;
981 iscsi_tcp_data_ready(struct sock *sk, int flag)
983 struct iscsi_conn *conn = sk->sk_user_data;
984 read_descriptor_t rd_desc;
986 read_lock(&sk->sk_callback_lock);
989 * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
990 * We set count to 1 because we want the network layer to
991 * hand us all the skbs that are available. iscsi_tcp_data_recv
992 * handled pdus that cross buffers or pdus that still need data.
994 rd_desc.arg.data = conn;
996 tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
998 read_unlock(&sk->sk_callback_lock);
1002 iscsi_tcp_state_change(struct sock *sk)
1004 struct iscsi_tcp_conn *tcp_conn;
1005 struct iscsi_conn *conn;
1006 struct iscsi_session *session;
1007 void (*old_state_change)(struct sock *);
1009 read_lock(&sk->sk_callback_lock);
1011 conn = (struct iscsi_conn*)sk->sk_user_data;
1012 session = conn->session;
1014 if ((sk->sk_state == TCP_CLOSE_WAIT ||
1015 sk->sk_state == TCP_CLOSE) &&
1016 !atomic_read(&sk->sk_rmem_alloc)) {
1017 debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
1018 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1021 tcp_conn = conn->dd_data;
1022 old_state_change = tcp_conn->old_state_change;
1024 read_unlock(&sk->sk_callback_lock);
1026 old_state_change(sk);
1030 * iscsi_write_space - Called when more output buffer space is available
1031 * @sk: socket space is available for
1034 iscsi_write_space(struct sock *sk)
1036 struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
1037 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1039 tcp_conn->old_write_space(sk);
1040 debug_tcp("iscsi_write_space: cid %d\n", conn->id);
1041 scsi_queue_work(conn->session->host, &conn->xmitwork);
1045 iscsi_conn_set_callbacks(struct iscsi_conn *conn)
1047 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1048 struct sock *sk = tcp_conn->sock->sk;
1050 /* assign new callbacks */
1051 write_lock_bh(&sk->sk_callback_lock);
1052 sk->sk_user_data = conn;
1053 tcp_conn->old_data_ready = sk->sk_data_ready;
1054 tcp_conn->old_state_change = sk->sk_state_change;
1055 tcp_conn->old_write_space = sk->sk_write_space;
1056 sk->sk_data_ready = iscsi_tcp_data_ready;
1057 sk->sk_state_change = iscsi_tcp_state_change;
1058 sk->sk_write_space = iscsi_write_space;
1059 write_unlock_bh(&sk->sk_callback_lock);
1063 iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
1065 struct sock *sk = tcp_conn->sock->sk;
1067 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
1068 write_lock_bh(&sk->sk_callback_lock);
1069 sk->sk_user_data = NULL;
1070 sk->sk_data_ready = tcp_conn->old_data_ready;
1071 sk->sk_state_change = tcp_conn->old_state_change;
1072 sk->sk_write_space = tcp_conn->old_write_space;
1073 sk->sk_no_check = 0;
1074 write_unlock_bh(&sk->sk_callback_lock);
1078 * iscsi_send - generic send routine
1079 * @sk: kernel's socket
1080 * @buf: buffer to write from
1081 * @size: actual size to write
1082 * @flags: socket's flags
1085 iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
1087 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1088 struct socket *sk = tcp_conn->sock;
1089 int offset = buf->sg.offset + buf->sent, res;
1092 * if we got use_sg=0 or are sending something we kmallocd
1093 * then we did not have to do kmap (kmap returns page_address)
1095 * if we got use_sg > 0, but had to drop down, we do not
1096 * set clustering so this should only happen for that
1099 if (buf->use_sendmsg)
1100 res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
1102 res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
1105 conn->txdata_octets += res;
1110 tcp_conn->sendpage_failures_cnt++;
1114 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1119 * iscsi_sendhdr - send PDU Header via tcp_sendpage()
1120 * @conn: iscsi connection
1121 * @buf: buffer to write from
1122 * @datalen: lenght of data to be sent after the header
1128 iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
1130 int flags = 0; /* MSG_DONTWAIT; */
1133 size = buf->sg.length - buf->sent;
1134 BUG_ON(buf->sent + size > buf->sg.length);
1135 if (buf->sent + size != buf->sg.length || datalen)
1138 res = iscsi_send(conn, buf, size, flags);
1139 debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
1150 * iscsi_sendpage - send one page of iSCSI Data-Out.
1151 * @conn: iscsi connection
1152 * @buf: buffer to write from
1153 * @count: remaining data
1154 * @sent: number of bytes sent
1160 iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
1161 int *count, int *sent)
1163 int flags = 0; /* MSG_DONTWAIT; */
1166 size = buf->sg.length - buf->sent;
1167 BUG_ON(buf->sent + size > buf->sg.length);
1170 if (buf->sent + size != buf->sg.length || *count != size)
1173 res = iscsi_send(conn, buf, size, flags);
1174 debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
1175 size, buf->sent, *count, *sent, res);
1188 iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
1189 struct iscsi_tcp_cmd_task *tcp_ctask)
1191 crypto_digest_init(tcp_conn->data_tx_tfm);
1192 tcp_ctask->digest_count = 4;
1196 * iscsi_solicit_data_cont - initialize next Data-Out
1197 * @conn: iscsi connection
1198 * @ctask: scsi command task
1200 * @left: bytes left to transfer
1203 * Initialize next Data-Out within this R2T sequence and continue
1204 * to process next Scatter-Gather element(if any) of this SCSI command.
1206 * Called under connection lock.
1209 iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1210 struct iscsi_r2t_info *r2t, int left)
1212 struct iscsi_data *hdr;
1213 struct scsi_cmnd *sc = ctask->sc;
1216 hdr = &r2t->dtask.hdr;
1217 memset(hdr, 0, sizeof(struct iscsi_data));
1218 hdr->ttt = r2t->ttt;
1219 hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
1220 r2t->solicit_datasn++;
1221 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
1222 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1223 hdr->itt = ctask->hdr->itt;
1224 hdr->exp_statsn = r2t->exp_statsn;
1225 new_offset = r2t->data_offset + r2t->sent;
1226 hdr->offset = cpu_to_be32(new_offset);
1227 if (left > conn->max_xmit_dlength) {
1228 hton24(hdr->dlength, conn->max_xmit_dlength);
1229 r2t->data_count = conn->max_xmit_dlength;
1231 hton24(hdr->dlength, left);
1232 r2t->data_count = left;
1233 hdr->flags = ISCSI_FLAG_CMD_FINAL;
1235 conn->dataout_pdus_cnt++;
1237 iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
1238 sizeof(struct iscsi_hdr));
1240 if (iscsi_buf_left(&r2t->sendbuf))
1244 iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
1247 iscsi_buf_init_iov(&r2t->sendbuf,
1248 (char*)sc->request_buffer + new_offset,
1254 static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
1257 tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
1258 if (!tcp_ctask->pad_count)
1261 tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
1262 debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
1263 tcp_ctask->xmstate |= XMSTATE_W_PAD;
1267 * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
1268 * @conn: iscsi connection
1269 * @ctask: scsi command task
1273 iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
1275 struct scsi_cmnd *sc = ctask->sc;
1276 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1278 BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
1280 tcp_ctask->sent = 0;
1281 tcp_ctask->sg_count = 0;
1283 if (sc->sc_data_direction == DMA_TO_DEVICE) {
1284 tcp_ctask->xmstate = XMSTATE_W_HDR;
1285 tcp_ctask->exp_r2tsn = 0;
1286 BUG_ON(ctask->total_length == 0);
1289 struct scatterlist *sg = sc->request_buffer;
1291 iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
1292 tcp_ctask->sg = sg + 1;
1293 tcp_ctask->bad_sg = sg + sc->use_sg;
1295 iscsi_buf_init_iov(&tcp_ctask->sendbuf,
1297 sc->request_bufflen);
1298 tcp_ctask->sg = NULL;
1299 tcp_ctask->bad_sg = NULL;
1301 debug_scsi("cmd [itt 0x%x total %d imm_data %d "
1302 "unsol count %d, unsol offset %d]\n",
1303 ctask->itt, ctask->total_length, ctask->imm_count,
1304 ctask->unsol_count, ctask->unsol_offset);
1306 tcp_ctask->xmstate = XMSTATE_R_HDR;
1308 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
1309 sizeof(struct iscsi_hdr));
1313 * iscsi_tcp_mtask_xmit - xmit management(immediate) task
1314 * @conn: iscsi connection
1315 * @mtask: task management task
1318 * The function can return -EAGAIN in which case caller must
1319 * call it again later, or recover. '0' return code means successful
1322 * Management xmit state machine consists of two states:
1323 * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
1324 * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
1327 iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
1329 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1332 debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
1333 conn->id, tcp_mtask->xmstate, mtask->itt);
1335 if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
1336 tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
1337 if (mtask->data_count)
1338 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1339 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
1340 conn->stop_stage != STOP_CONN_RECOVER &&
1342 iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
1343 (u8*)tcp_mtask->hdrext);
1344 rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
1347 tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
1348 if (mtask->data_count)
1349 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
1354 if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
1355 BUG_ON(!mtask->data_count);
1356 tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
1357 /* FIXME: implement.
1358 * Virtual buffer could be spreaded across multiple pages...
1363 rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
1364 &mtask->data_count, &tcp_mtask->sent);
1366 tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
1369 } while (mtask->data_count);
1372 BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
1373 if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1374 struct iscsi_session *session = conn->session;
1376 spin_lock_bh(&session->lock);
1377 list_del(&conn->mtask->running);
1378 __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
1380 spin_unlock_bh(&session->lock);
1386 iscsi_send_read_hdr(struct iscsi_conn *conn,
1387 struct iscsi_tcp_cmd_task *tcp_ctask)
1391 tcp_ctask->xmstate &= ~XMSTATE_R_HDR;
1392 if (conn->hdrdgst_en)
1393 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1394 (u8*)tcp_ctask->hdrext);
1395 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0);
1397 BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE);
1398 return 0; /* wait for Data-In */
1400 tcp_ctask->xmstate |= XMSTATE_R_HDR;
1405 iscsi_send_write_hdr(struct iscsi_conn *conn,
1406 struct iscsi_cmd_task *ctask)
1408 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1411 tcp_ctask->xmstate &= ~XMSTATE_W_HDR;
1412 if (conn->hdrdgst_en)
1413 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1414 (u8*)tcp_ctask->hdrext);
1415 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
1417 tcp_ctask->xmstate |= XMSTATE_W_HDR;
1421 if (ctask->imm_count) {
1422 tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
1423 iscsi_set_padding(tcp_ctask, ctask->imm_count);
1425 if (ctask->conn->datadgst_en) {
1426 iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
1427 tcp_ctask->immdigest = 0;
1431 if (ctask->unsol_count)
1432 tcp_ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
1437 iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1439 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1440 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1443 if (tcp_ctask->xmstate & XMSTATE_W_PAD) {
1444 iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
1445 tcp_ctask->pad_count);
1446 if (conn->datadgst_en)
1447 crypto_digest_update(tcp_conn->data_tx_tfm,
1448 &tcp_ctask->sendbuf.sg, 1);
1449 } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD))
1452 tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
1453 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD;
1454 debug_scsi("sending %d pad bytes for itt 0x%x\n",
1455 tcp_ctask->pad_count, ctask->itt);
1456 rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
1459 debug_scsi("padding send failed %d\n", rc);
1460 tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD;
1466 iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1467 struct iscsi_buf *buf, uint32_t *digest)
1469 struct iscsi_tcp_cmd_task *tcp_ctask;
1470 struct iscsi_tcp_conn *tcp_conn;
1473 if (!conn->datadgst_en)
1476 tcp_ctask = ctask->dd_data;
1477 tcp_conn = conn->dd_data;
1479 if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) {
1480 crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest);
1481 iscsi_buf_init_iov(buf, (char*)digest, 4);
1483 tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST;
1485 rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
1487 debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest,
1490 debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
1491 *digest, ctask->itt);
1492 tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST;
1498 iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
1499 struct scatterlist **sg, int *sent, int *count,
1500 struct iscsi_buf *digestbuf, uint32_t *digest)
1502 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1503 struct iscsi_conn *conn = ctask->conn;
1504 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1505 int rc, buf_sent, offset;
1509 offset = sendbuf->sent;
1511 rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent);
1512 *sent = *sent + buf_sent;
1513 if (buf_sent && conn->datadgst_en)
1514 partial_sg_digest_update(tcp_conn->data_tx_tfm,
1515 &sendbuf->sg, sendbuf->sg.offset + offset,
1517 if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
1518 iscsi_buf_init_sg(sendbuf, *sg);
1526 rc = iscsi_send_padding(conn, ctask);
1530 return iscsi_send_digest(conn, ctask, digestbuf, digest);
1534 iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1536 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1537 struct iscsi_data_task *dtask;
1540 tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
1541 if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
1542 dtask = &tcp_ctask->unsol_dtask;
1544 iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
1545 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
1546 sizeof(struct iscsi_hdr));
1547 if (conn->hdrdgst_en)
1548 iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
1549 (u8*)dtask->hdrext);
1550 if (conn->datadgst_en) {
1551 iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
1555 tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
1556 iscsi_set_padding(tcp_ctask, ctask->data_count);
1559 rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
1561 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1562 tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
1566 debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
1567 ctask->itt, ctask->unsol_count, tcp_ctask->sent);
1572 iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1574 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1577 if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
1578 BUG_ON(!ctask->unsol_count);
1579 tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
1581 rc = iscsi_send_unsol_hdr(conn, ctask);
1586 if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
1587 struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
1588 int start = tcp_ctask->sent;
1590 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1591 &tcp_ctask->sent, &ctask->data_count,
1592 &dtask->digestbuf, &dtask->digest);
1593 ctask->unsol_count -= tcp_ctask->sent - start;
1596 tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
1598 * Done with the Data-Out. Next, check if we need
1599 * to send another unsolicited Data-Out.
1601 if (ctask->unsol_count) {
1602 debug_scsi("sending more uns\n");
1603 tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
1610 static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
1611 struct iscsi_cmd_task *ctask)
1613 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1614 struct iscsi_session *session = conn->session;
1615 struct iscsi_r2t_info *r2t;
1616 struct iscsi_data_task *dtask;
1619 if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
1620 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1621 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1622 if (!tcp_ctask->r2t)
1623 __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
1626 r2t = tcp_ctask->r2t;
1627 dtask = &r2t->dtask;
1629 if (conn->hdrdgst_en)
1630 iscsi_hdr_digest(conn, &r2t->headbuf,
1631 (u8*)dtask->hdrext);
1633 if (conn->datadgst_en) {
1634 iscsi_data_digest_init(conn->dd_data, tcp_ctask);
1638 rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
1640 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1641 tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
1645 iscsi_set_padding(tcp_ctask, r2t->data_count);
1646 debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
1647 r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
1651 if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
1652 r2t = tcp_ctask->r2t;
1653 dtask = &r2t->dtask;
1655 rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
1656 &r2t->sent, &r2t->data_count,
1657 &dtask->digestbuf, &dtask->digest);
1660 tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
1663 * Done with this Data-Out. Next, check if we have
1664 * to send another Data-Out for this R2T.
1666 BUG_ON(r2t->data_length - r2t->sent < 0);
1667 left = r2t->data_length - r2t->sent;
1669 iscsi_solicit_data_cont(conn, ctask, r2t, left);
1670 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1671 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1676 * Done with this R2T. Check if there are more
1677 * outstanding R2Ts ready to be processed.
1679 spin_lock_bh(&session->lock);
1680 tcp_ctask->r2t = NULL;
1681 __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
1683 if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t,
1685 tcp_ctask->r2t = r2t;
1686 tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
1687 tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
1688 spin_unlock_bh(&session->lock);
1691 spin_unlock_bh(&session->lock);
1697 iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
1699 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1702 debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
1703 conn->id, tcp_ctask->xmstate, ctask->itt);
1706 * serialize with TMF AbortTask
1711 if (tcp_ctask->xmstate & XMSTATE_R_HDR)
1712 return iscsi_send_read_hdr(conn, tcp_ctask);
1714 if (tcp_ctask->xmstate & XMSTATE_W_HDR) {
1715 rc = iscsi_send_write_hdr(conn, ctask);
1720 if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
1721 rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
1722 &tcp_ctask->sent, &ctask->imm_count,
1723 &tcp_ctask->immbuf, &tcp_ctask->immdigest);
1726 tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
1729 rc = iscsi_send_unsol_pdu(conn, ctask);
1733 rc = iscsi_send_sol_pdu(conn, ctask);
1740 static struct iscsi_cls_conn *
1741 iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1743 struct iscsi_conn *conn;
1744 struct iscsi_cls_conn *cls_conn;
1745 struct iscsi_tcp_conn *tcp_conn;
1747 cls_conn = iscsi_conn_setup(cls_session, conn_idx);
1750 conn = cls_conn->dd_data;
1752 * due to strange issues with iser these are not set
1753 * in iscsi_conn_setup
1755 conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
1757 tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
1759 goto tcp_conn_alloc_fail;
1761 conn->dd_data = tcp_conn;
1762 tcp_conn->iscsi_conn = conn;
1763 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1764 /* initial operational parameters */
1765 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
1769 tcp_conn_alloc_fail:
1770 iscsi_conn_teardown(cls_conn);
1775 iscsi_tcp_release_conn(struct iscsi_conn *conn)
1777 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1779 if (!tcp_conn->sock)
1782 sock_hold(tcp_conn->sock->sk);
1783 iscsi_conn_restore_callbacks(tcp_conn);
1784 sock_put(tcp_conn->sock->sk);
1786 sock_release(tcp_conn->sock);
1787 tcp_conn->sock = NULL;
1788 conn->recv_lock = NULL;
1792 iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
1794 struct iscsi_conn *conn = cls_conn->dd_data;
1795 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1798 if (conn->hdrdgst_en || conn->datadgst_en)
1801 iscsi_tcp_release_conn(conn);
1802 iscsi_conn_teardown(cls_conn);
1804 /* now free tcp_conn */
1806 if (tcp_conn->tx_tfm)
1807 crypto_free_tfm(tcp_conn->tx_tfm);
1808 if (tcp_conn->rx_tfm)
1809 crypto_free_tfm(tcp_conn->rx_tfm);
1810 if (tcp_conn->data_tx_tfm)
1811 crypto_free_tfm(tcp_conn->data_tx_tfm);
1812 if (tcp_conn->data_rx_tfm)
1813 crypto_free_tfm(tcp_conn->data_rx_tfm);
1820 iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1822 struct iscsi_conn *conn = cls_conn->dd_data;
1824 iscsi_conn_stop(cls_conn, flag);
1825 iscsi_tcp_release_conn(conn);
1829 iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
1830 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
1833 struct iscsi_conn *conn = cls_conn->dd_data;
1834 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1836 struct socket *sock;
1839 /* lookup for existing socket */
1840 sock = sockfd_lookup((int)transport_eph, &err);
1842 printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
1846 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
1850 /* bind iSCSI connection and socket */
1851 tcp_conn->sock = sock;
1853 /* setup Socket parameters */
1856 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
1857 sk->sk_allocation = GFP_ATOMIC;
1859 /* FIXME: disable Nagle's algorithm */
1862 * Intercept TCP callbacks for sendfile like receive
1865 conn->recv_lock = &sk->sk_callback_lock;
1866 iscsi_conn_set_callbacks(conn);
1867 tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
1869 * set receive state machine into initial state
1871 tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
1876 /* called with host lock */
1878 iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask,
1879 char *data, uint32_t data_size)
1881 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
1883 iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
1884 sizeof(struct iscsi_hdr));
1885 tcp_mtask->xmstate = XMSTATE_IMM_HDR;
1886 tcp_mtask->sent = 0;
1888 if (mtask->data_count)
1889 iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data,
1894 iscsi_r2tpool_alloc(struct iscsi_session *session)
1900 * initialize per-task: R2T pool and xmit queue
1902 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1903 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1904 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1907 * pre-allocated x4 as much r2ts to handle race when
1908 * target acks DataOut faster than we data_xmit() queues
1909 * could replenish r2tqueue.
1913 if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
1914 (void***)&tcp_ctask->r2ts,
1915 sizeof(struct iscsi_r2t_info))) {
1916 goto r2t_alloc_fail;
1919 /* R2T xmit queue */
1920 tcp_ctask->r2tqueue = kfifo_alloc(
1921 session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
1922 if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
1923 iscsi_pool_free(&tcp_ctask->r2tpool,
1924 (void**)tcp_ctask->r2ts);
1925 goto r2t_alloc_fail;
1932 for (i = 0; i < cmd_i; i++) {
1933 struct iscsi_cmd_task *ctask = session->cmds[i];
1934 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1936 kfifo_free(tcp_ctask->r2tqueue);
1937 iscsi_pool_free(&tcp_ctask->r2tpool,
1938 (void**)tcp_ctask->r2ts);
1944 iscsi_r2tpool_free(struct iscsi_session *session)
1948 for (i = 0; i < session->cmds_max; i++) {
1949 struct iscsi_cmd_task *ctask = session->cmds[i];
1950 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
1952 kfifo_free(tcp_ctask->r2tqueue);
1953 iscsi_pool_free(&tcp_ctask->r2tpool,
1954 (void**)tcp_ctask->r2ts);
1959 iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
1960 char *buf, int buflen)
1962 struct iscsi_conn *conn = cls_conn->dd_data;
1963 struct iscsi_session *session = conn->session;
1964 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1968 case ISCSI_PARAM_HDRDGST_EN:
1969 iscsi_set_param(cls_conn, param, buf, buflen);
1970 tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
1971 if (conn->hdrdgst_en) {
1972 tcp_conn->hdr_size += sizeof(__u32);
1973 if (!tcp_conn->tx_tfm)
1974 tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c",
1976 if (!tcp_conn->tx_tfm)
1978 if (!tcp_conn->rx_tfm)
1979 tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c",
1981 if (!tcp_conn->rx_tfm) {
1982 crypto_free_tfm(tcp_conn->tx_tfm);
1986 if (tcp_conn->tx_tfm)
1987 crypto_free_tfm(tcp_conn->tx_tfm);
1988 if (tcp_conn->rx_tfm)
1989 crypto_free_tfm(tcp_conn->rx_tfm);
1992 case ISCSI_PARAM_DATADGST_EN:
1993 iscsi_set_param(cls_conn, param, buf, buflen);
1994 if (conn->datadgst_en) {
1995 if (!tcp_conn->data_tx_tfm)
1996 tcp_conn->data_tx_tfm =
1997 crypto_alloc_tfm("crc32c", 0);
1998 if (!tcp_conn->data_tx_tfm)
2000 if (!tcp_conn->data_rx_tfm)
2001 tcp_conn->data_rx_tfm =
2002 crypto_alloc_tfm("crc32c", 0);
2003 if (!tcp_conn->data_rx_tfm) {
2004 crypto_free_tfm(tcp_conn->data_tx_tfm);
2008 if (tcp_conn->data_tx_tfm)
2009 crypto_free_tfm(tcp_conn->data_tx_tfm);
2010 if (tcp_conn->data_rx_tfm)
2011 crypto_free_tfm(tcp_conn->data_rx_tfm);
2013 tcp_conn->sendpage = conn->datadgst_en ?
2014 sock_no_sendpage : tcp_conn->sock->ops->sendpage;
2016 case ISCSI_PARAM_MAX_R2T:
2017 sscanf(buf, "%d", &value);
2018 if (session->max_r2t == roundup_pow_of_two(value))
2020 iscsi_r2tpool_free(session);
2021 iscsi_set_param(cls_conn, param, buf, buflen);
2022 if (session->max_r2t & (session->max_r2t - 1))
2023 session->max_r2t = roundup_pow_of_two(session->max_r2t);
2024 if (iscsi_r2tpool_alloc(session))
2028 return iscsi_set_param(cls_conn, param, buf, buflen);
2035 iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
2036 enum iscsi_param param, char *buf)
2038 struct iscsi_conn *conn = cls_conn->dd_data;
2039 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2040 struct inet_sock *inet;
2041 struct ipv6_pinfo *np;
2046 case ISCSI_PARAM_CONN_PORT:
2047 mutex_lock(&conn->xmitmutex);
2048 if (!tcp_conn->sock) {
2049 mutex_unlock(&conn->xmitmutex);
2053 inet = inet_sk(tcp_conn->sock->sk);
2054 len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport));
2055 mutex_unlock(&conn->xmitmutex);
2057 case ISCSI_PARAM_CONN_ADDRESS:
2058 mutex_lock(&conn->xmitmutex);
2059 if (!tcp_conn->sock) {
2060 mutex_unlock(&conn->xmitmutex);
2064 sk = tcp_conn->sock->sk;
2065 if (sk->sk_family == PF_INET) {
2067 len = sprintf(buf, "%u.%u.%u.%u\n",
2068 NIPQUAD(inet->daddr));
2072 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
2075 mutex_unlock(&conn->xmitmutex);
2078 return iscsi_conn_get_param(cls_conn, param, buf);
2085 iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
2087 struct iscsi_conn *conn = cls_conn->dd_data;
2088 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2090 stats->txdata_octets = conn->txdata_octets;
2091 stats->rxdata_octets = conn->rxdata_octets;
2092 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2093 stats->dataout_pdus = conn->dataout_pdus_cnt;
2094 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2095 stats->datain_pdus = conn->datain_pdus_cnt;
2096 stats->r2t_pdus = conn->r2t_pdus_cnt;
2097 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2098 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2099 stats->custom_length = 3;
2100 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
2101 stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
2102 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
2103 stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
2104 strcpy(stats->custom[2].desc, "eh_abort_cnt");
2105 stats->custom[2].value = conn->eh_abort_cnt;
2108 static struct iscsi_cls_session *
2109 iscsi_tcp_session_create(struct iscsi_transport *iscsit,
2110 struct scsi_transport_template *scsit,
2111 uint32_t initial_cmdsn, uint32_t *hostno)
2113 struct iscsi_cls_session *cls_session;
2114 struct iscsi_session *session;
2118 cls_session = iscsi_session_setup(iscsit, scsit,
2119 sizeof(struct iscsi_tcp_cmd_task),
2120 sizeof(struct iscsi_tcp_mgmt_task),
2121 initial_cmdsn, &hn);
2126 session = class_to_transport_session(cls_session);
2127 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2128 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
2129 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
2131 ctask->hdr = &tcp_ctask->hdr;
2134 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
2135 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
2136 struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
2138 mtask->hdr = &tcp_mtask->hdr;
2141 if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
2142 goto r2tpool_alloc_fail;
2147 iscsi_session_teardown(cls_session);
2151 static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
2153 iscsi_r2tpool_free(class_to_transport_session(cls_session));
2154 iscsi_session_teardown(cls_session);
2157 static struct scsi_host_template iscsi_sht = {
2158 .name = "iSCSI Initiator over TCP/IP",
2159 .queuecommand = iscsi_queuecommand,
2160 .change_queue_depth = iscsi_change_queue_depth,
2161 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
2162 .sg_tablesize = ISCSI_SG_TABLESIZE,
2163 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
2164 .eh_abort_handler = iscsi_eh_abort,
2165 .eh_host_reset_handler = iscsi_eh_host_reset,
2166 .use_clustering = DISABLE_CLUSTERING,
2167 .proc_name = "iscsi_tcp",
2171 static struct iscsi_transport iscsi_tcp_transport = {
2172 .owner = THIS_MODULE,
2174 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
2176 .param_mask = ISCSI_MAX_RECV_DLENGTH |
2177 ISCSI_MAX_XMIT_DLENGTH |
2180 ISCSI_INITIAL_R2T_EN |
2185 ISCSI_PDU_INORDER_EN |
2186 ISCSI_DATASEQ_INORDER_EN |
2189 ISCSI_CONN_ADDRESS |
2191 ISCSI_PERSISTENT_PORT |
2192 ISCSI_PERSISTENT_ADDRESS |
2195 .host_template = &iscsi_sht,
2196 .conndata_size = sizeof(struct iscsi_conn),
2198 .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
2199 /* session management */
2200 .create_session = iscsi_tcp_session_create,
2201 .destroy_session = iscsi_tcp_session_destroy,
2202 /* connection management */
2203 .create_conn = iscsi_tcp_conn_create,
2204 .bind_conn = iscsi_tcp_conn_bind,
2205 .destroy_conn = iscsi_tcp_conn_destroy,
2206 .set_param = iscsi_conn_set_param,
2207 .get_conn_param = iscsi_tcp_conn_get_param,
2208 .get_session_param = iscsi_session_get_param,
2209 .start_conn = iscsi_conn_start,
2210 .stop_conn = iscsi_tcp_conn_stop,
2212 .send_pdu = iscsi_conn_send_pdu,
2213 .get_stats = iscsi_conn_get_stats,
2214 .init_cmd_task = iscsi_tcp_cmd_init,
2215 .init_mgmt_task = iscsi_tcp_mgmt_init,
2216 .xmit_cmd_task = iscsi_tcp_ctask_xmit,
2217 .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
2218 .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
2220 .session_recovery_timedout = iscsi_session_recovery_timedout,
2224 iscsi_tcp_init(void)
2226 if (iscsi_max_lun < 1) {
2227 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
2231 iscsi_tcp_transport.max_lun = iscsi_max_lun;
2233 if (!iscsi_register_transport(&iscsi_tcp_transport))
2240 iscsi_tcp_exit(void)
2242 iscsi_unregister_transport(&iscsi_tcp_transport);
2245 module_init(iscsi_tcp_init);
2246 module_exit(iscsi_tcp_exit);