]>
Commit | Line | Data |
---|---|---|
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 | /* xmit state machine */ |
843c0a8a MC |
28 | #define XMSTATE_IDLE 0x0 |
29 | #define XMSTATE_CMD_HDR_INIT 0x1 | |
30 | #define XMSTATE_CMD_HDR_XMIT 0x2 | |
31 | #define XMSTATE_IMM_HDR 0x4 | |
32 | #define XMSTATE_IMM_DATA 0x8 | |
33 | #define XMSTATE_UNS_INIT 0x10 | |
34 | #define XMSTATE_UNS_HDR 0x20 | |
35 | #define XMSTATE_UNS_DATA 0x40 | |
36 | #define XMSTATE_SOL_HDR 0x80 | |
37 | #define XMSTATE_SOL_DATA 0x100 | |
38 | #define XMSTATE_W_PAD 0x200 | |
39 | #define XMSTATE_W_RESEND_PAD 0x400 | |
40 | #define XMSTATE_W_RESEND_DATA_DIGEST 0x800 | |
41 | #define XMSTATE_IMM_HDR_INIT 0x1000 | |
42 | #define XMSTATE_SOL_HDR_INIT 0x2000 | |
62f38300 | 43 | |
c213ca07 | 44 | #define ISCSI_SG_TABLESIZE SG_ALL |
c213ca07 AA |
45 | #define ISCSI_TCP_MAX_CMD_LEN 16 |
46 | ||
dc64ddf4 | 47 | struct crypto_hash; |
5bb0b55a | 48 | struct socket; |
da32dd68 OK |
49 | struct iscsi_tcp_conn; |
50 | struct iscsi_chunk; | |
51 | ||
52 | typedef int iscsi_chunk_done_fn_t(struct iscsi_tcp_conn *, | |
53 | struct iscsi_chunk *); | |
54 | ||
55 | struct iscsi_chunk { | |
56 | unsigned char *data; | |
57 | unsigned int size; | |
58 | unsigned int copied; | |
59 | unsigned int total_size; | |
60 | unsigned int total_copied; | |
61 | ||
62 | struct hash_desc *hash; | |
63 | unsigned char recv_digest[ISCSI_DIGEST_SIZE]; | |
64 | unsigned char digest[ISCSI_DIGEST_SIZE]; | |
65 | unsigned int digest_len; | |
66 | ||
67 | struct scatterlist *sg; | |
68 | void *sg_mapped; | |
69 | unsigned int sg_offset; | |
70 | unsigned int sg_index; | |
71 | unsigned int sg_count; | |
72 | ||
73 | iscsi_chunk_done_fn_t *done; | |
74 | }; | |
c213ca07 AA |
75 | |
76 | /* Socket connection recieve helper */ | |
77 | struct iscsi_tcp_recv { | |
78 | struct iscsi_hdr *hdr; | |
da32dd68 OK |
79 | struct iscsi_chunk chunk; |
80 | ||
81 | /* Allocate buffer for BHS + AHS */ | |
82 | uint32_t hdr_buf[64]; | |
c213ca07 AA |
83 | |
84 | /* copied and flipped values */ | |
c213ca07 | 85 | int datalen; |
da32dd68 OK |
86 | }; |
87 | ||
88 | /* Socket connection send helper */ | |
89 | struct iscsi_tcp_send { | |
90 | struct iscsi_hdr *hdr; | |
91 | struct iscsi_chunk chunk; | |
92 | struct iscsi_chunk data_chunk; | |
93 | ||
94 | /* Allocate buffer for BHS + AHS */ | |
95 | uint32_t hdr_buf[64]; | |
c213ca07 AA |
96 | }; |
97 | ||
5bb0b55a MC |
98 | struct iscsi_tcp_conn { |
99 | struct iscsi_conn *iscsi_conn; | |
100 | struct socket *sock; | |
c213ca07 AA |
101 | int stop_stage; /* conn_stop() flag: * |
102 | * stop to recover, * | |
103 | * stop to terminate */ | |
c213ca07 | 104 | /* control data */ |
c213ca07 | 105 | struct iscsi_tcp_recv in; /* TCP receive context */ |
da32dd68 | 106 | struct iscsi_tcp_send out; /* TCP send context */ |
c213ca07 AA |
107 | |
108 | /* old values for socket callbacks */ | |
109 | void (*old_data_ready)(struct sock *, int); | |
110 | void (*old_state_change)(struct sock *); | |
111 | void (*old_write_space)(struct sock *); | |
112 | ||
dd8c0d95 | 113 | /* data and header digests */ |
c9802cd9 JB |
114 | struct hash_desc tx_hash; /* CRC32C (Tx) */ |
115 | struct hash_desc rx_hash; /* CRC32C (Rx) */ | |
c213ca07 | 116 | |
5bb0b55a | 117 | /* MIB custom statistics */ |
c213ca07 AA |
118 | uint32_t sendpage_failures_cnt; |
119 | uint32_t discontiguous_hdr_cnt; | |
56851698 FT |
120 | |
121 | ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); | |
c213ca07 AA |
122 | }; |
123 | ||
c213ca07 AA |
124 | struct iscsi_buf { |
125 | struct scatterlist sg; | |
c213ca07 | 126 | unsigned int sent; |
7cae5159 | 127 | char use_sendmsg; |
c213ca07 AA |
128 | }; |
129 | ||
130 | struct iscsi_data_task { | |
131 | struct iscsi_data hdr; /* PDU */ | |
004d6530 | 132 | char hdrext[ISCSI_DIGEST_SIZE];/* Header-Digest */ |
c213ca07 AA |
133 | struct iscsi_buf digestbuf; /* digest buffer */ |
134 | uint32_t digest; /* data digest */ | |
135 | }; | |
c213ca07 | 136 | |
5bb0b55a MC |
137 | struct iscsi_tcp_mgmt_task { |
138 | struct iscsi_hdr hdr; | |
004d6530 | 139 | char hdrext[ISCSI_DIGEST_SIZE]; /* Header-Digest */ |
843c0a8a | 140 | int xmstate; /* mgmt xmit progress */ |
c213ca07 AA |
141 | struct iscsi_buf headbuf; /* header buffer */ |
142 | struct iscsi_buf sendbuf; /* in progress buffer */ | |
143 | int sent; | |
c213ca07 AA |
144 | }; |
145 | ||
146 | struct iscsi_r2t_info { | |
147 | __be32 ttt; /* copied from R2T */ | |
148 | __be32 exp_statsn; /* copied from R2T */ | |
149 | uint32_t data_length; /* copied from R2T */ | |
150 | uint32_t data_offset; /* copied from R2T */ | |
151 | struct iscsi_buf headbuf; /* Data-Out Header Buffer */ | |
152 | struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/ | |
153 | int sent; /* R2T sequence progress */ | |
154 | int data_count; /* DATA-Out payload progress */ | |
155 | struct scatterlist *sg; /* per-R2T SG list */ | |
156 | int solicit_datasn; | |
ffbfe925 | 157 | struct iscsi_data_task dtask; /* which data task */ |
c213ca07 AA |
158 | }; |
159 | ||
5bb0b55a | 160 | struct iscsi_tcp_cmd_task { |
004d6530 BH |
161 | struct iscsi_hdr_buff { |
162 | struct iscsi_cmd cmd_hdr; | |
163 | char hdrextbuf[ISCSI_MAX_AHS_SIZE + | |
164 | ISCSI_DIGEST_SIZE]; | |
165 | } hdr; | |
c213ca07 | 166 | char pad[ISCSI_PAD_LEN]; |
5bb0b55a | 167 | int pad_count; /* padded bytes */ |
c213ca07 AA |
168 | struct iscsi_buf headbuf; /* header buf (xmit) */ |
169 | struct iscsi_buf sendbuf; /* in progress buffer*/ | |
843c0a8a | 170 | int xmstate; /* xmit xtate machine */ |
c213ca07 AA |
171 | int sent; |
172 | struct scatterlist *sg; /* per-cmd SG list */ | |
173 | struct scatterlist *bad_sg; /* assert statement */ | |
174 | int sg_count; /* SG's to process */ | |
d473cc7f | 175 | uint32_t exp_datasn; /* expected target's R2TSN/DataSN */ |
c213ca07 | 176 | int data_offset; |
c213ca07 | 177 | struct iscsi_r2t_info *r2t; /* in progress R2T */ |
6320377f | 178 | struct iscsi_pool r2tpool; |
c213ca07 | 179 | struct kfifo *r2tqueue; |
c213ca07 AA |
180 | int digest_count; |
181 | uint32_t immdigest; /* for imm data */ | |
182 | struct iscsi_buf immbuf; /* for imm data digest */ | |
ffbfe925 | 183 | struct iscsi_data_task unsol_dtask; /* unsol data task */ |
c213ca07 AA |
184 | }; |
185 | ||
186 | #endif /* ISCSI_H */ |