iscsi_tcp.h

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/*
 * 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 [email protected]
 *
 * 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_SW_TCP_H
#define ISCSI_SW_TCP_H

#include <scsi/libiscsi.h>
#include <scsi/libiscsi_tcp.h>

struct socket;
struct iscsi_tcp_conn;

/* Socket connection send helper */
struct iscsi_sw_tcp_send {
    struct iscsi_hdr    *hdr;
    struct iscsi_segment    segment;
    struct iscsi_segment    data_segment;
};

struct iscsi_sw_tcp_conn {
    struct socket       *sock;

    struct iscsi_sw_tcp_send out;
    /* 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_sw_tcp_host {
    struct iscsi_session    *session;
};

struct iscsi_sw_tcp_hdrbuf {
    struct iscsi_hdr    hdrbuf;
    char            hdrextbuf[ISCSI_MAX_AHS_SIZE +
                                          ISCSI_DIGEST_SIZE];
};

#endif /* ISCSI_SW_TCP_H */