root/include/linux/tfrc.h

INCLUDED FROM

#ifndef _LINUX_TFRC_H_
#define _LINUX_TFRC_H_
/*
 *  TFRC - Data Structures for the TCP-Friendly Rate Control congestion
 *         control mechanism as specified in RFC 3448.
 *
 *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
 *  Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
 *
 *  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.
 */
#include <linux/types.h>

/**     tfrc_rx_info    -    TFRC Receiver Data Structure
 *
 *      @tfrcrx_x_recv: receiver estimate of sending rate (3.2.2)
 *      @tfrcrx_rtt:    round-trip-time (communicated by sender)
 *      @tfrcrx_p:      current estimate of loss event rate (3.2.2)
 */
struct tfrc_rx_info {
        __u32 tfrcrx_x_recv;
        __u32 tfrcrx_rtt;
        __u32 tfrcrx_p;
};

/**     tfrc_tx_info    -    TFRC Sender Data Structure
 *
 *      @tfrctx_x:      computed transmit rate (4.3 (4))
 *      @tfrctx_x_recv: receiver estimate of send rate (4.3)
 *      @tfrctx_x_calc: return value of throughput equation (3.1)
 *      @tfrctx_rtt:    (moving average) estimate of RTT (4.3)
 *      @tfrctx_p:      current loss event rate (5.4)
 *      @tfrctx_rto:    estimate of RTO, equals 4*RTT (4.3)
 *      @tfrctx_ipi:    inter-packet interval (4.6)
 *
 *  Note: X and X_recv are both maintained in units of 64 * bytes/second. This
 *        enables a finer resolution of sending rates and avoids problems with
 *        integer arithmetic; u32 is not sufficient as scaling consumes 6 bits.
 */
struct tfrc_tx_info {
        __u64 tfrctx_x;
        __u64 tfrctx_x_recv;
        __u32 tfrctx_x_calc;
        __u32 tfrctx_rtt;
        __u32 tfrctx_p;
        __u32 tfrctx_rto;
        __u32 tfrctx_ipi;
};

#endif /* _LINUX_TFRC_H_ */