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#ifndef _TFRC_H_
#define _TFRC_H_
* Copyright (c) 2007 The University of Aberdeen, Scotland, UK
* Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
* Copyright (c) 2005-6 Ian McDonald <>
* Copyright (c) 2005 Arnaldo Carvalho de Melo <>
* 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>
#include <linux/math64.h>
#include "../../dccp.h"
/* internal includes that this library exports: */
#include "loss_interval.h"
#include "packet_history.h"
extern int tfrc_debug;
#define tfrc_pr_debug(format, a...) DCCP_PR_DEBUG(tfrc_debug, format, ##a)
#define tfrc_pr_debug(format, a...)
/* integer-arithmetic divisions of type (a * 1000000)/b */
static inline u64 scaled_div(u64 a, u64 b)
BUG_ON(b == 0);
return div64_u64(a * 1000000, b);
static inline u32 scaled_div32(u64 a, u64 b)
u64 result = scaled_div(a, b);
if (result > UINT_MAX) {
DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX",
(unsigned long long)a, (unsigned long long)b);
return UINT_MAX;
return result;
* tfrc_ewma - Exponentially weighted moving average
* @weight: Weight to be used as damping factor, in units of 1/10
static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight)
return avg ? (weight * avg + (10 - weight) * newval) / 10 : newval;
extern u32 tfrc_calc_x(u16 s, u32 R, u32 p);
extern u32 tfrc_calc_x_reverse_lookup(u32 fvalue);
extern int tfrc_tx_packet_history_init(void);
extern void tfrc_tx_packet_history_exit(void);
extern int tfrc_rx_packet_history_init(void);
extern void tfrc_rx_packet_history_exit(void);
extern int tfrc_li_init(void);
extern void tfrc_li_exit(void);
extern int tfrc_lib_init(void);
extern void tfrc_lib_exit(void);
#define tfrc_lib_init() (0)
#define tfrc_lib_exit()
#endif /* _TFRC_H_ */