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c213ca07 AA |
1 | /* |
2 | * iSCSI Initiator TCP Transport | |
3 | * Copyright (C) 2004 Dmitry Yusupov | |
4 | * Copyright (C) 2004 Alex Aizman | |
5bb0b55a MC |
5 | * Copyright (C) 2005 - 2006 Mike Christie |
6 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
c213ca07 AA |
7 | * 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 | ||
5bb0b55a | 25 | #include <scsi/libiscsi.h> |
c213ca07 | 26 | |
c213ca07 | 27 | #define ISCSI_SG_TABLESIZE SG_ALL |
c213ca07 AA |
28 | #define ISCSI_TCP_MAX_CMD_LEN 16 |
29 | ||
dc64ddf4 | 30 | struct crypto_hash; |
5bb0b55a | 31 | struct socket; |
da32dd68 | 32 | struct iscsi_tcp_conn; |
a8ac6311 | 33 | struct iscsi_segment; |
da32dd68 | 34 | |
a8ac6311 OK |
35 | typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *, |
36 | struct iscsi_segment *); | |
da32dd68 | 37 | |
a8ac6311 | 38 | struct iscsi_segment { |
da32dd68 OK |
39 | unsigned char *data; |
40 | unsigned int size; | |
41 | unsigned int copied; | |
42 | unsigned int total_size; | |
43 | unsigned int total_copied; | |
44 | ||
45 | struct hash_desc *hash; | |
46 | unsigned char recv_digest[ISCSI_DIGEST_SIZE]; | |
47 | unsigned char digest[ISCSI_DIGEST_SIZE]; | |
48 | unsigned int digest_len; | |
49 | ||
50 | struct scatterlist *sg; | |
51 | void *sg_mapped; | |
52 | unsigned int sg_offset; | |
da32dd68 | 53 | |
a8ac6311 | 54 | iscsi_segment_done_fn_t *done; |
da32dd68 | 55 | }; |
c213ca07 AA |
56 | |
57 | /* Socket connection recieve helper */ | |
58 | struct iscsi_tcp_recv { | |
59 | struct iscsi_hdr *hdr; | |
a8ac6311 | 60 | struct iscsi_segment segment; |
da32dd68 OK |
61 | |
62 | /* Allocate buffer for BHS + AHS */ | |
63 | uint32_t hdr_buf[64]; | |
c213ca07 AA |
64 | |
65 | /* copied and flipped values */ | |
c213ca07 | 66 | int datalen; |
da32dd68 OK |
67 | }; |
68 | ||
69 | /* Socket connection send helper */ | |
70 | struct iscsi_tcp_send { | |
71 | struct iscsi_hdr *hdr; | |
a8ac6311 OK |
72 | struct iscsi_segment segment; |
73 | struct iscsi_segment data_segment; | |
c213ca07 AA |
74 | }; |
75 | ||
5bb0b55a MC |
76 | struct iscsi_tcp_conn { |
77 | struct iscsi_conn *iscsi_conn; | |
78 | struct socket *sock; | |
c213ca07 AA |
79 | int stop_stage; /* conn_stop() flag: * |
80 | * stop to recover, * | |
81 | * stop to terminate */ | |
c213ca07 | 82 | /* control data */ |
c213ca07 | 83 | struct iscsi_tcp_recv in; /* TCP receive context */ |
da32dd68 | 84 | struct iscsi_tcp_send out; /* TCP send context */ |
c213ca07 AA |
85 | |
86 | /* old values for socket callbacks */ | |
87 | void (*old_data_ready)(struct sock *, int); | |
88 | void (*old_state_change)(struct sock *); | |
89 | void (*old_write_space)(struct sock *); | |
90 | ||
dd8c0d95 | 91 | /* data and header digests */ |
c9802cd9 JB |
92 | struct hash_desc tx_hash; /* CRC32C (Tx) */ |
93 | struct hash_desc rx_hash; /* CRC32C (Rx) */ | |
c213ca07 | 94 | |
5bb0b55a | 95 | /* MIB custom statistics */ |
c213ca07 AA |
96 | uint32_t sendpage_failures_cnt; |
97 | uint32_t discontiguous_hdr_cnt; | |
56851698 | 98 | |
a8ac6311 | 99 | int error; |
c213ca07 | 100 | |
a8ac6311 | 101 | ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); |
c213ca07 AA |
102 | }; |
103 | ||
104 | struct iscsi_data_task { | |
105 | struct iscsi_data hdr; /* PDU */ | |
004d6530 | 106 | char hdrext[ISCSI_DIGEST_SIZE];/* Header-Digest */ |
c213ca07 | 107 | }; |
c213ca07 | 108 | |
5bb0b55a MC |
109 | struct iscsi_tcp_mgmt_task { |
110 | struct iscsi_hdr hdr; | |
004d6530 | 111 | char hdrext[ISCSI_DIGEST_SIZE]; /* Header-Digest */ |
c213ca07 AA |
112 | }; |
113 | ||
114 | struct iscsi_r2t_info { | |
115 | __be32 ttt; /* copied from R2T */ | |
116 | __be32 exp_statsn; /* copied from R2T */ | |
117 | uint32_t data_length; /* copied from R2T */ | |
118 | uint32_t data_offset; /* copied from R2T */ | |
c213ca07 AA |
119 | int sent; /* R2T sequence progress */ |
120 | int data_count; /* DATA-Out payload progress */ | |
c213ca07 | 121 | int solicit_datasn; |
a8ac6311 | 122 | struct iscsi_data_task dtask; /* Data-Out header buf */ |
c213ca07 AA |
123 | }; |
124 | ||
5bb0b55a | 125 | struct iscsi_tcp_cmd_task { |
004d6530 BH |
126 | struct iscsi_hdr_buff { |
127 | struct iscsi_cmd cmd_hdr; | |
128 | char hdrextbuf[ISCSI_MAX_AHS_SIZE + | |
129 | ISCSI_DIGEST_SIZE]; | |
130 | } hdr; | |
a8ac6311 | 131 | |
c213ca07 | 132 | int sent; |
a8ac6311 | 133 | uint32_t exp_datasn; /* expected target's R2TSN/DataSN */ |
c213ca07 | 134 | int data_offset; |
a8ac6311 | 135 | struct iscsi_r2t_info *r2t; /* in progress R2T */ |
6320377f | 136 | struct iscsi_pool r2tpool; |
c213ca07 | 137 | struct kfifo *r2tqueue; |
a8ac6311 | 138 | struct iscsi_data_task unsol_dtask; /* Data-Out header buf */ |
c213ca07 AA |
139 | }; |
140 | ||
141 | #endif /* ISCSI_H */ |