78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
#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 <ian.mcdonald@jandi.co.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>
|
|
#include <linux/math64.h>
|
|
#include "../../dccp.h"
|
|
|
|
/* internal includes that this library exports: */
|
|
#include "loss_interval.h"
|
|
#include "packet_history.h"
|
|
|
|
#ifdef CONFIG_IP_DCCP_TFRC_DEBUG
|
|
extern bool tfrc_debug;
|
|
#define tfrc_pr_debug(format, a...) DCCP_PR_DEBUG(tfrc_debug, format, ##a)
|
|
#else
|
|
#define tfrc_pr_debug(format, a...)
|
|
#endif
|
|
|
|
/* 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 u32 tfrc_invert_loss_event_rate(u32 loss_event_rate);
|
|
|
|
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);
|
|
|
|
#ifdef CONFIG_IP_DCCP_TFRC_LIB
|
|
extern int tfrc_lib_init(void);
|
|
extern void tfrc_lib_exit(void);
|
|
#else
|
|
#define tfrc_lib_init() (0)
|
|
#define tfrc_lib_exit()
|
|
#endif
|
|
#endif /* _TFRC_H_ */
|