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Alex Aizmanc213ca02005-08-04 19:30:31 -07001/*
2 * iSCSI Initiator TCP Transport
3 * Copyright (C) 2004 Dmitry Yusupov
4 * Copyright (C) 2004 Alex Aizman
Mike Christie5bb0b552006-04-06 21:26:46 -05005 * Copyright (C) 2005 - 2006 Mike Christie
6 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
Alex Aizmanc213ca02005-08-04 19:30:31 -07007 * maintained by open-iscsi@googlegroups.com
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published
11 * by the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * See the file COPYING included with this distribution for more details.
20 */
21
22#ifndef ISCSI_TCP_H
23#define ISCSI_TCP_H
24
Mike Christie5bb0b552006-04-06 21:26:46 -050025#include <scsi/libiscsi.h>
Alex Aizmanc213ca02005-08-04 19:30:31 -070026
Herbert Xudc64ddf2006-08-24 18:45:50 +100027struct crypto_hash;
Mike Christie5bb0b552006-04-06 21:26:46 -050028struct socket;
Olaf Kirchda32dd62007-12-13 12:43:21 -060029struct iscsi_tcp_conn;
Olaf Kircha8ac6312007-12-13 12:43:35 -060030struct iscsi_segment;
Olaf Kirchda32dd62007-12-13 12:43:21 -060031
Olaf Kircha8ac6312007-12-13 12:43:35 -060032typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *,
33 struct iscsi_segment *);
Olaf Kirchda32dd62007-12-13 12:43:21 -060034
Olaf Kircha8ac6312007-12-13 12:43:35 -060035struct iscsi_segment {
Olaf Kirchda32dd62007-12-13 12:43:21 -060036 unsigned char *data;
37 unsigned int size;
38 unsigned int copied;
39 unsigned int total_size;
40 unsigned int total_copied;
41
42 struct hash_desc *hash;
43 unsigned char recv_digest[ISCSI_DIGEST_SIZE];
44 unsigned char digest[ISCSI_DIGEST_SIZE];
45 unsigned int digest_len;
46
47 struct scatterlist *sg;
48 void *sg_mapped;
49 unsigned int sg_offset;
Olaf Kirchda32dd62007-12-13 12:43:21 -060050
Olaf Kircha8ac6312007-12-13 12:43:35 -060051 iscsi_segment_done_fn_t *done;
Olaf Kirchda32dd62007-12-13 12:43:21 -060052};
Alex Aizmanc213ca02005-08-04 19:30:31 -070053
54/* Socket connection recieve helper */
55struct iscsi_tcp_recv {
56 struct iscsi_hdr *hdr;
Olaf Kircha8ac6312007-12-13 12:43:35 -060057 struct iscsi_segment segment;
Olaf Kirchda32dd62007-12-13 12:43:21 -060058
59 /* Allocate buffer for BHS + AHS */
60 uint32_t hdr_buf[64];
Alex Aizmanc213ca02005-08-04 19:30:31 -070061
62 /* copied and flipped values */
Alex Aizmanc213ca02005-08-04 19:30:31 -070063 int datalen;
Olaf Kirchda32dd62007-12-13 12:43:21 -060064};
65
66/* Socket connection send helper */
67struct iscsi_tcp_send {
68 struct iscsi_hdr *hdr;
Olaf Kircha8ac6312007-12-13 12:43:35 -060069 struct iscsi_segment segment;
70 struct iscsi_segment data_segment;
Alex Aizmanc213ca02005-08-04 19:30:31 -070071};
72
Mike Christie5bb0b552006-04-06 21:26:46 -050073struct iscsi_tcp_conn {
74 struct iscsi_conn *iscsi_conn;
75 struct socket *sock;
Alex Aizmanc213ca02005-08-04 19:30:31 -070076 int stop_stage; /* conn_stop() flag: *
77 * stop to recover, *
78 * stop to terminate */
Alex Aizmanc213ca02005-08-04 19:30:31 -070079 /* control data */
Alex Aizmanc213ca02005-08-04 19:30:31 -070080 struct iscsi_tcp_recv in; /* TCP receive context */
Olaf Kirchda32dd62007-12-13 12:43:21 -060081 struct iscsi_tcp_send out; /* TCP send context */
Alex Aizmanc213ca02005-08-04 19:30:31 -070082
83 /* old values for socket callbacks */
84 void (*old_data_ready)(struct sock *, int);
85 void (*old_state_change)(struct sock *);
86 void (*old_write_space)(struct sock *);
87
Mike Christiedd8c0d92006-08-31 18:09:28 -040088 /* data and header digests */
James Bottomleyc9802cd2006-09-23 15:33:43 -050089 struct hash_desc tx_hash; /* CRC32C (Tx) */
90 struct hash_desc rx_hash; /* CRC32C (Rx) */
Alex Aizmanc213ca02005-08-04 19:30:31 -070091
Mike Christie5bb0b552006-04-06 21:26:46 -050092 /* MIB custom statistics */
Alex Aizmanc213ca02005-08-04 19:30:31 -070093 uint32_t sendpage_failures_cnt;
94 uint32_t discontiguous_hdr_cnt;
FUJITA Tomonori56851692006-01-13 18:05:44 -060095
Olaf Kircha8ac6312007-12-13 12:43:35 -060096 int error;
Alex Aizmanc213ca02005-08-04 19:30:31 -070097
Olaf Kircha8ac6312007-12-13 12:43:35 -060098 ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
Alex Aizmanc213ca02005-08-04 19:30:31 -070099};
100
101struct iscsi_data_task {
102 struct iscsi_data hdr; /* PDU */
Boaz Harrosh004d6532007-12-13 12:43:23 -0600103 char hdrext[ISCSI_DIGEST_SIZE];/* Header-Digest */
Alex Aizmanc213ca02005-08-04 19:30:31 -0700104};
Alex Aizmanc213ca02005-08-04 19:30:31 -0700105
Alex Aizmanc213ca02005-08-04 19:30:31 -0700106struct iscsi_r2t_info {
107 __be32 ttt; /* copied from R2T */
108 __be32 exp_statsn; /* copied from R2T */
109 uint32_t data_length; /* copied from R2T */
110 uint32_t data_offset; /* copied from R2T */
Alex Aizmanc213ca02005-08-04 19:30:31 -0700111 int sent; /* R2T sequence progress */
112 int data_count; /* DATA-Out payload progress */
Alex Aizmanc213ca02005-08-04 19:30:31 -0700113 int solicit_datasn;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600114 struct iscsi_data_task dtask; /* Data-Out header buf */
Alex Aizmanc213ca02005-08-04 19:30:31 -0700115};
116
Mike Christie135a8ad2008-05-21 15:54:10 -0500117struct iscsi_tcp_task {
Boaz Harrosh004d6532007-12-13 12:43:23 -0600118 struct iscsi_hdr_buff {
119 struct iscsi_cmd cmd_hdr;
120 char hdrextbuf[ISCSI_MAX_AHS_SIZE +
121 ISCSI_DIGEST_SIZE];
122 } hdr;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600123
Alex Aizmanc213ca02005-08-04 19:30:31 -0700124 int sent;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600125 uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
Alex Aizmanc213ca02005-08-04 19:30:31 -0700126 int data_offset;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600127 struct iscsi_r2t_info *r2t; /* in progress R2T */
Olaf Kirch63203772007-12-13 12:43:25 -0600128 struct iscsi_pool r2tpool;
Alex Aizmanc213ca02005-08-04 19:30:31 -0700129 struct kfifo *r2tqueue;
Olaf Kircha8ac6312007-12-13 12:43:35 -0600130 struct iscsi_data_task unsol_dtask; /* Data-Out header buf */
Alex Aizmanc213ca02005-08-04 19:30:31 -0700131};
132
133#endif /* ISCSI_H */