/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * 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
 *
 * 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;
        /* Taken when accessing the sock from the netlink/sysfs interface */
        struct mutex            sock_lock;

        struct work_struct      recvwork;
        bool                    queue_recv;

        struct iscsi_sw_tcp_send out;
        /* old values for socket callbacks */
        void                    (*old_data_ready)(struct sock *);
        void                    (*old_state_change)(struct sock *);
        void                    (*old_write_space)(struct sock *);

        /* data and header digests */
        u32                     tx_crc; /* CRC32C (Tx) */
        u32                     rx_crc; /* CRC32C (Rx) */

        /* MIB custom statistics */
        uint32_t                sendpage_failures_cnt;
        uint32_t                discontiguous_hdr_cnt;
};

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 */