/*
   * 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_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 */