linux/include/linux/tfrc.h
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   1#ifndef _LINUX_TFRC_H_
   2#define _LINUX_TFRC_H_
   3/*
   4 *  TFRC - Data Structures for the TCP-Friendly Rate Control congestion
   5 *         control mechanism as specified in RFC 3448.
   6 *
   7 *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
   8 *  Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
   9 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  10 *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
  11 *
  12 *  This program is free software; you can redistribute it and/or modify
  13 *  it under the terms of the GNU General Public License as published by
  14 *  the Free Software Foundation; either version 2 of the License, or
  15 *  (at your option) any later version.
  16 */
  17#include <linux/types.h>
  18
  19/**     tfrc_rx_info    -    TFRC Receiver Data Structure
  20 *
  21 *      @tfrcrx_x_recv: receiver estimate of sending rate (3.2.2)
  22 *      @tfrcrx_rtt:    round-trip-time (communicated by sender)
  23 *      @tfrcrx_p:      current estimate of loss event rate (3.2.2)
  24 */
  25struct tfrc_rx_info {
  26        __u32 tfrcrx_x_recv;
  27        __u32 tfrcrx_rtt;
  28        __u32 tfrcrx_p;
  29};
  30
  31/**     tfrc_tx_info    -    TFRC Sender Data Structure
  32 *
  33 *      @tfrctx_x:      computed transmit rate (4.3 (4))
  34 *      @tfrctx_x_recv: receiver estimate of send rate (4.3)
  35 *      @tfrctx_x_calc: return value of throughput equation (3.1)
  36 *      @tfrctx_rtt:    (moving average) estimate of RTT (4.3)
  37 *      @tfrctx_p:      current loss event rate (5.4)
  38 *      @tfrctx_rto:    estimate of RTO, equals 4*RTT (4.3)
  39 *      @tfrctx_ipi:    inter-packet interval (4.6)
  40 *
  41 *  Note: X and X_recv are both maintained in units of 64 * bytes/second. This
  42 *        enables a finer resolution of sending rates and avoids problems with
  43 *        integer arithmetic; u32 is not sufficient as scaling consumes 6 bits.
  44 */
  45struct tfrc_tx_info {
  46        __u64 tfrctx_x;
  47        __u64 tfrctx_x_recv;
  48        __u32 tfrctx_x_calc;
  49        __u32 tfrctx_rtt;
  50        __u32 tfrctx_p;
  51        __u32 tfrctx_rto;
  52        __u32 tfrctx_ipi;
  53};
  54
  55#endif /* _LINUX_TFRC_H_ */
  56
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