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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 AA |
26 | |
27 | /* Socket's Receive state machine */ | |
28 | #define IN_PROGRESS_WAIT_HEADER 0x0 | |
29 | #define IN_PROGRESS_HEADER_GATHER 0x1 | |
30 | #define IN_PROGRESS_DATA_RECV 0x2 | |
31 | #define IN_PROGRESS_DDIGEST_RECV 0x3 | |
32 | ||
c213ca07 | 33 | /* xmit state machine */ |
62f38300 MC |
34 | #define XMSTATE_IDLE 0x0 |
35 | #define XMSTATE_R_HDR 0x1 | |
36 | #define XMSTATE_W_HDR 0x2 | |
37 | #define XMSTATE_IMM_HDR 0x4 | |
38 | #define XMSTATE_IMM_DATA 0x8 | |
39 | #define XMSTATE_UNS_INIT 0x10 | |
40 | #define XMSTATE_UNS_HDR 0x20 | |
41 | #define XMSTATE_UNS_DATA 0x40 | |
42 | #define XMSTATE_SOL_HDR 0x80 | |
43 | #define XMSTATE_SOL_DATA 0x100 | |
44 | #define XMSTATE_W_PAD 0x200 | |
45 | #define XMSTATE_W_RESEND_PAD 0x400 | |
46 | #define XMSTATE_W_RESEND_DATA_DIGEST 0x800 | |
47 | ||
c213ca07 | 48 | #define ISCSI_PAD_LEN 4 |
c213ca07 | 49 | #define ISCSI_SG_TABLESIZE SG_ALL |
c213ca07 AA |
50 | #define ISCSI_TCP_MAX_CMD_LEN 16 |
51 | ||
5bb0b55a | 52 | struct socket; |
c213ca07 AA |
53 | |
54 | /* Socket connection recieve helper */ | |
55 | struct iscsi_tcp_recv { | |
56 | struct iscsi_hdr *hdr; | |
57 | struct sk_buff *skb; | |
58 | int offset; | |
59 | int len; | |
60 | int hdr_offset; | |
61 | int copy; | |
62 | int copied; | |
63 | int padding; | |
64 | struct iscsi_cmd_task *ctask; /* current cmd in progress */ | |
65 | ||
66 | /* copied and flipped values */ | |
c213ca07 | 67 | int datalen; |
c213ca07 | 68 | int datadgst; |
5bb0b55a | 69 | char zero_copy_hdr; |
c213ca07 AA |
70 | }; |
71 | ||
5bb0b55a MC |
72 | struct iscsi_tcp_conn { |
73 | struct iscsi_conn *iscsi_conn; | |
74 | struct socket *sock; | |
c213ca07 AA |
75 | struct iscsi_hdr hdr; /* header placeholder */ |
76 | char hdrext[4*sizeof(__u16) + | |
77 | sizeof(__u32)]; | |
78 | int data_copied; | |
c213ca07 AA |
79 | int stop_stage; /* conn_stop() flag: * |
80 | * stop to recover, * | |
81 | * stop to terminate */ | |
82 | /* iSCSI connection-wide sequencing */ | |
c213ca07 | 83 | int hdr_size; /* PDU header size */ |
c213ca07 | 84 | /* control data */ |
c213ca07 | 85 | struct iscsi_tcp_recv in; /* TCP receive context */ |
c213ca07 | 86 | int in_progress; /* connection state machine */ |
c213ca07 AA |
87 | |
88 | /* old values for socket callbacks */ | |
89 | void (*old_data_ready)(struct sock *, int); | |
90 | void (*old_state_change)(struct sock *); | |
91 | void (*old_write_space)(struct sock *); | |
92 | ||
dd8c0d95 | 93 | /* data and header digests */ |
c213ca07 | 94 | struct crypto_tfm *tx_tfm; /* CRC32C (Tx) */ |
dd8c0d95 | 95 | struct crypto_tfm *rx_tfm; /* CRC32C (Rx) */ |
c213ca07 | 96 | |
5bb0b55a | 97 | /* MIB custom statistics */ |
c213ca07 AA |
98 | uint32_t sendpage_failures_cnt; |
99 | uint32_t discontiguous_hdr_cnt; | |
56851698 FT |
100 | |
101 | ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); | |
c213ca07 AA |
102 | }; |
103 | ||
c213ca07 AA |
104 | struct iscsi_buf { |
105 | struct scatterlist sg; | |
c213ca07 | 106 | unsigned int sent; |
7cae5159 | 107 | char use_sendmsg; |
c213ca07 AA |
108 | }; |
109 | ||
110 | struct iscsi_data_task { | |
111 | struct iscsi_data hdr; /* PDU */ | |
112 | char hdrext[sizeof(__u32)]; /* Header-Digest */ | |
c213ca07 AA |
113 | struct iscsi_buf digestbuf; /* digest buffer */ |
114 | uint32_t digest; /* data digest */ | |
115 | }; | |
c213ca07 | 116 | |
5bb0b55a MC |
117 | struct iscsi_tcp_mgmt_task { |
118 | struct iscsi_hdr hdr; | |
119 | char hdrext[sizeof(__u32)]; /* Header-Digest */ | |
c213ca07 | 120 | int xmstate; /* mgmt xmit progress */ |
c213ca07 AA |
121 | struct iscsi_buf headbuf; /* header buffer */ |
122 | struct iscsi_buf sendbuf; /* in progress buffer */ | |
123 | int sent; | |
c213ca07 AA |
124 | }; |
125 | ||
126 | struct iscsi_r2t_info { | |
127 | __be32 ttt; /* copied from R2T */ | |
128 | __be32 exp_statsn; /* copied from R2T */ | |
129 | uint32_t data_length; /* copied from R2T */ | |
130 | uint32_t data_offset; /* copied from R2T */ | |
131 | struct iscsi_buf headbuf; /* Data-Out Header Buffer */ | |
132 | struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/ | |
133 | int sent; /* R2T sequence progress */ | |
134 | int data_count; /* DATA-Out payload progress */ | |
135 | struct scatterlist *sg; /* per-R2T SG list */ | |
136 | int solicit_datasn; | |
ffbfe925 | 137 | struct iscsi_data_task dtask; /* which data task */ |
c213ca07 AA |
138 | }; |
139 | ||
5bb0b55a MC |
140 | struct iscsi_tcp_cmd_task { |
141 | struct iscsi_cmd hdr; | |
c213ca07 AA |
142 | char hdrext[4*sizeof(__u16)+ /* AHS */ |
143 | sizeof(__u32)]; /* HeaderDigest */ | |
144 | char pad[ISCSI_PAD_LEN]; | |
5bb0b55a | 145 | int pad_count; /* padded bytes */ |
c213ca07 AA |
146 | struct iscsi_buf headbuf; /* header buf (xmit) */ |
147 | struct iscsi_buf sendbuf; /* in progress buffer*/ | |
5bb0b55a | 148 | int xmstate; /* xmit xtate machine */ |
c213ca07 AA |
149 | int sent; |
150 | struct scatterlist *sg; /* per-cmd SG list */ | |
151 | struct scatterlist *bad_sg; /* assert statement */ | |
152 | int sg_count; /* SG's to process */ | |
c213ca07 | 153 | uint32_t exp_r2tsn; |
c213ca07 | 154 | int data_offset; |
c213ca07 AA |
155 | struct iscsi_r2t_info *r2t; /* in progress R2T */ |
156 | struct iscsi_queue r2tpool; | |
157 | struct kfifo *r2tqueue; | |
158 | struct iscsi_r2t_info **r2ts; | |
c213ca07 AA |
159 | int digest_count; |
160 | uint32_t immdigest; /* for imm data */ | |
161 | struct iscsi_buf immbuf; /* for imm data digest */ | |
ffbfe925 | 162 | struct iscsi_data_task unsol_dtask; /* unsol data task */ |
c213ca07 AA |
163 | }; |
164 | ||
165 | #endif /* ISCSI_H */ |