171 строка
5.1 KiB
C
171 строка
5.1 KiB
C
/*
|
|
* iSCSI Initiator TCP Transport
|
|
* Copyright (C) 2004 Dmitry Yusupov
|
|
* Copyright (C) 2004 Alex Aizman
|
|
* Copyright (C) 2005 - 2006 Mike Christie
|
|
* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
|
|
* maintained by open-iscsi@googlegroups.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published
|
|
* by the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* See the file COPYING included with this distribution for more details.
|
|
*/
|
|
|
|
#ifndef ISCSI_TCP_H
|
|
#define ISCSI_TCP_H
|
|
|
|
#include <scsi/libiscsi.h>
|
|
|
|
/* Socket's Receive state machine */
|
|
#define IN_PROGRESS_WAIT_HEADER 0x0
|
|
#define IN_PROGRESS_HEADER_GATHER 0x1
|
|
#define IN_PROGRESS_DATA_RECV 0x2
|
|
#define IN_PROGRESS_DDIGEST_RECV 0x3
|
|
#define IN_PROGRESS_PAD_RECV 0x4
|
|
|
|
/* xmit state machine */
|
|
#define XMSTATE_VALUE_IDLE 0
|
|
#define XMSTATE_BIT_CMD_HDR_INIT 0
|
|
#define XMSTATE_BIT_CMD_HDR_XMIT 1
|
|
#define XMSTATE_BIT_IMM_HDR 2
|
|
#define XMSTATE_BIT_IMM_DATA 3
|
|
#define XMSTATE_BIT_UNS_INIT 4
|
|
#define XMSTATE_BIT_UNS_HDR 5
|
|
#define XMSTATE_BIT_UNS_DATA 6
|
|
#define XMSTATE_BIT_SOL_HDR 7
|
|
#define XMSTATE_BIT_SOL_DATA 8
|
|
#define XMSTATE_BIT_W_PAD 9
|
|
#define XMSTATE_BIT_W_RESEND_PAD 10
|
|
#define XMSTATE_BIT_W_RESEND_DATA_DIGEST 11
|
|
#define XMSTATE_BIT_IMM_HDR_INIT 12
|
|
#define XMSTATE_BIT_SOL_HDR_INIT 13
|
|
|
|
#define ISCSI_PAD_LEN 4
|
|
#define ISCSI_SG_TABLESIZE SG_ALL
|
|
#define ISCSI_TCP_MAX_CMD_LEN 16
|
|
|
|
struct crypto_hash;
|
|
struct socket;
|
|
|
|
/* Socket connection recieve helper */
|
|
struct iscsi_tcp_recv {
|
|
struct iscsi_hdr *hdr;
|
|
struct sk_buff *skb;
|
|
int offset;
|
|
int len;
|
|
int hdr_offset;
|
|
int copy;
|
|
int copied;
|
|
int padding;
|
|
struct iscsi_cmd_task *ctask; /* current cmd in progress */
|
|
|
|
/* copied and flipped values */
|
|
int datalen;
|
|
int datadgst;
|
|
char zero_copy_hdr;
|
|
};
|
|
|
|
struct iscsi_tcp_conn {
|
|
struct iscsi_conn *iscsi_conn;
|
|
struct socket *sock;
|
|
struct iscsi_hdr hdr; /* header placeholder */
|
|
char hdrext[4*sizeof(__u16) +
|
|
sizeof(__u32)];
|
|
int data_copied;
|
|
int stop_stage; /* conn_stop() flag: *
|
|
* stop to recover, *
|
|
* stop to terminate */
|
|
/* iSCSI connection-wide sequencing */
|
|
int hdr_size; /* PDU header size */
|
|
|
|
/* control data */
|
|
struct iscsi_tcp_recv in; /* TCP receive context */
|
|
int in_progress; /* connection state machine */
|
|
|
|
/* old values for socket callbacks */
|
|
void (*old_data_ready)(struct sock *, int);
|
|
void (*old_state_change)(struct sock *);
|
|
void (*old_write_space)(struct sock *);
|
|
|
|
/* data and header digests */
|
|
struct hash_desc tx_hash; /* CRC32C (Tx) */
|
|
struct hash_desc rx_hash; /* CRC32C (Rx) */
|
|
|
|
/* MIB custom statistics */
|
|
uint32_t sendpage_failures_cnt;
|
|
uint32_t discontiguous_hdr_cnt;
|
|
|
|
ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
|
|
};
|
|
|
|
struct iscsi_buf {
|
|
struct scatterlist sg;
|
|
unsigned int sent;
|
|
char use_sendmsg;
|
|
};
|
|
|
|
struct iscsi_data_task {
|
|
struct iscsi_data hdr; /* PDU */
|
|
char hdrext[sizeof(__u32)]; /* Header-Digest */
|
|
struct iscsi_buf digestbuf; /* digest buffer */
|
|
uint32_t digest; /* data digest */
|
|
};
|
|
|
|
struct iscsi_tcp_mgmt_task {
|
|
struct iscsi_hdr hdr;
|
|
char hdrext[sizeof(__u32)]; /* Header-Digest */
|
|
unsigned long xmstate; /* mgmt xmit progress */
|
|
struct iscsi_buf headbuf; /* header buffer */
|
|
struct iscsi_buf sendbuf; /* in progress buffer */
|
|
int sent;
|
|
};
|
|
|
|
struct iscsi_r2t_info {
|
|
__be32 ttt; /* copied from R2T */
|
|
__be32 exp_statsn; /* copied from R2T */
|
|
uint32_t data_length; /* copied from R2T */
|
|
uint32_t data_offset; /* copied from R2T */
|
|
struct iscsi_buf headbuf; /* Data-Out Header Buffer */
|
|
struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/
|
|
int sent; /* R2T sequence progress */
|
|
int data_count; /* DATA-Out payload progress */
|
|
struct scatterlist *sg; /* per-R2T SG list */
|
|
int solicit_datasn;
|
|
struct iscsi_data_task dtask; /* which data task */
|
|
};
|
|
|
|
struct iscsi_tcp_cmd_task {
|
|
struct iscsi_cmd hdr;
|
|
char hdrext[4*sizeof(__u16)+ /* AHS */
|
|
sizeof(__u32)]; /* HeaderDigest */
|
|
char pad[ISCSI_PAD_LEN];
|
|
int pad_count; /* padded bytes */
|
|
struct iscsi_buf headbuf; /* header buf (xmit) */
|
|
struct iscsi_buf sendbuf; /* in progress buffer*/
|
|
unsigned long xmstate; /* xmit xtate machine */
|
|
int sent;
|
|
struct scatterlist *sg; /* per-cmd SG list */
|
|
struct scatterlist *bad_sg; /* assert statement */
|
|
int sg_count; /* SG's to process */
|
|
uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
|
|
int data_offset;
|
|
struct iscsi_r2t_info *r2t; /* in progress R2T */
|
|
struct iscsi_queue r2tpool;
|
|
struct kfifo *r2tqueue;
|
|
struct iscsi_r2t_info **r2ts;
|
|
int digest_count;
|
|
uint32_t immdigest; /* for imm data */
|
|
struct iscsi_buf immbuf; /* for imm data digest */
|
|
struct iscsi_data_task unsol_dtask; /* unsol data task */
|
|
};
|
|
|
|
#endif /* ISCSI_H */
|