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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 | /* 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_PAD_LEN 4 |
c213ca07 | 45 | #define ISCSI_SG_TABLESIZE SG_ALL |
c213ca07 AA |
46 | #define ISCSI_TCP_MAX_CMD_LEN 16 |
47 | ||
dc64ddf4 | 48 | struct crypto_hash; |
5bb0b55a | 49 | struct socket; |
da32dd68 OK |
50 | struct iscsi_tcp_conn; |
51 | struct iscsi_chunk; | |
52 | ||
53 | typedef int iscsi_chunk_done_fn_t(struct iscsi_tcp_conn *, | |
54 | struct iscsi_chunk *); | |
55 | ||
56 | struct iscsi_chunk { | |
57 | unsigned char *data; | |
58 | unsigned int size; | |
59 | unsigned int copied; | |
60 | unsigned int total_size; | |
61 | unsigned int total_copied; | |
62 | ||
63 | struct hash_desc *hash; | |
64 | unsigned char recv_digest[ISCSI_DIGEST_SIZE]; | |
65 | unsigned char digest[ISCSI_DIGEST_SIZE]; | |
66 | unsigned int digest_len; | |
67 | ||
68 | struct scatterlist *sg; | |
69 | void *sg_mapped; | |
70 | unsigned int sg_offset; | |
71 | unsigned int sg_index; | |
72 | unsigned int sg_count; | |
73 | ||
74 | iscsi_chunk_done_fn_t *done; | |
75 | }; | |
c213ca07 AA |
76 | |
77 | /* Socket connection recieve helper */ | |
78 | struct iscsi_tcp_recv { | |
79 | struct iscsi_hdr *hdr; | |
da32dd68 OK |
80 | struct iscsi_chunk chunk; |
81 | ||
82 | /* Allocate buffer for BHS + AHS */ | |
83 | uint32_t hdr_buf[64]; | |
c213ca07 AA |
84 | |
85 | /* copied and flipped values */ | |
c213ca07 | 86 | int datalen; |
da32dd68 OK |
87 | }; |
88 | ||
89 | /* Socket connection send helper */ | |
90 | struct iscsi_tcp_send { | |
91 | struct iscsi_hdr *hdr; | |
92 | struct iscsi_chunk chunk; | |
93 | struct iscsi_chunk data_chunk; | |
94 | ||
95 | /* Allocate buffer for BHS + AHS */ | |
96 | uint32_t hdr_buf[64]; | |
c213ca07 AA |
97 | }; |
98 | ||
5bb0b55a MC |
99 | struct iscsi_tcp_conn { |
100 | struct iscsi_conn *iscsi_conn; | |
101 | struct socket *sock; | |
c213ca07 AA |
102 | int stop_stage; /* conn_stop() flag: * |
103 | * stop to recover, * | |
104 | * stop to terminate */ | |
c213ca07 | 105 | /* control data */ |
c213ca07 | 106 | struct iscsi_tcp_recv in; /* TCP receive context */ |
da32dd68 | 107 | struct iscsi_tcp_send out; /* TCP send context */ |
c213ca07 AA |
108 | |
109 | /* old values for socket callbacks */ | |
110 | void (*old_data_ready)(struct sock *, int); | |
111 | void (*old_state_change)(struct sock *); | |
112 | void (*old_write_space)(struct sock *); | |
113 | ||
dd8c0d95 | 114 | /* data and header digests */ |
c9802cd9 JB |
115 | struct hash_desc tx_hash; /* CRC32C (Tx) */ |
116 | struct hash_desc rx_hash; /* CRC32C (Rx) */ | |
c213ca07 | 117 | |
5bb0b55a | 118 | /* MIB custom statistics */ |
c213ca07 AA |
119 | uint32_t sendpage_failures_cnt; |
120 | uint32_t discontiguous_hdr_cnt; | |
56851698 FT |
121 | |
122 | ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); | |
c213ca07 AA |
123 | }; |
124 | ||
c213ca07 AA |
125 | struct iscsi_buf { |
126 | struct scatterlist sg; | |
c213ca07 | 127 | unsigned int sent; |
7cae5159 | 128 | char use_sendmsg; |
c213ca07 AA |
129 | }; |
130 | ||
131 | struct iscsi_data_task { | |
132 | struct iscsi_data hdr; /* PDU */ | |
133 | char hdrext[sizeof(__u32)]; /* Header-Digest */ | |
c213ca07 AA |
134 | struct iscsi_buf digestbuf; /* digest buffer */ |
135 | uint32_t digest; /* data digest */ | |
136 | }; | |
c213ca07 | 137 | |
5bb0b55a MC |
138 | struct iscsi_tcp_mgmt_task { |
139 | struct iscsi_hdr hdr; | |
140 | char hdrext[sizeof(__u32)]; /* Header-Digest */ | |
843c0a8a | 141 | int xmstate; /* mgmt xmit progress */ |
c213ca07 AA |
142 | struct iscsi_buf headbuf; /* header buffer */ |
143 | struct iscsi_buf sendbuf; /* in progress buffer */ | |
144 | int sent; | |
c213ca07 AA |
145 | }; |
146 | ||
147 | struct iscsi_r2t_info { | |
148 | __be32 ttt; /* copied from R2T */ | |
149 | __be32 exp_statsn; /* copied from R2T */ | |
150 | uint32_t data_length; /* copied from R2T */ | |
151 | uint32_t data_offset; /* copied from R2T */ | |
152 | struct iscsi_buf headbuf; /* Data-Out Header Buffer */ | |
153 | struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/ | |
154 | int sent; /* R2T sequence progress */ | |
155 | int data_count; /* DATA-Out payload progress */ | |
156 | struct scatterlist *sg; /* per-R2T SG list */ | |
157 | int solicit_datasn; | |
ffbfe925 | 158 | struct iscsi_data_task dtask; /* which data task */ |
c213ca07 AA |
159 | }; |
160 | ||
5bb0b55a MC |
161 | struct iscsi_tcp_cmd_task { |
162 | struct iscsi_cmd hdr; | |
c213ca07 AA |
163 | char hdrext[4*sizeof(__u16)+ /* AHS */ |
164 | sizeof(__u32)]; /* HeaderDigest */ | |
165 | char pad[ISCSI_PAD_LEN]; | |
5bb0b55a | 166 | int pad_count; /* padded bytes */ |
c213ca07 AA |
167 | struct iscsi_buf headbuf; /* header buf (xmit) */ |
168 | struct iscsi_buf sendbuf; /* in progress buffer*/ | |
843c0a8a | 169 | int xmstate; /* xmit xtate machine */ |
c213ca07 AA |
170 | int sent; |
171 | struct scatterlist *sg; /* per-cmd SG list */ | |
172 | struct scatterlist *bad_sg; /* assert statement */ | |
173 | int sg_count; /* SG's to process */ | |
d473cc7f | 174 | uint32_t exp_datasn; /* expected target's R2TSN/DataSN */ |
c213ca07 | 175 | int data_offset; |
c213ca07 AA |
176 | struct iscsi_r2t_info *r2t; /* in progress R2T */ |
177 | struct iscsi_queue r2tpool; | |
178 | struct kfifo *r2tqueue; | |
179 | struct iscsi_r2t_info **r2ts; | |
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 */ |