linux/net/dccp/ccids/lib/tfrc.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
#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 <[email protected]>
 *  Copyright (c) 2005   Arnaldo Carvalho de Melo <[email protected]>
 *  Copyright (c) 2003   Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
 */
#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...) …
#else
#define tfrc_pr_debug …
#endif

/* integer-arithmetic divisions of type (a * 1000000)/b */
static inline u64 scaled_div(u64 a, u64 b)
{ … }

static inline u32 scaled_div32(u64 a, u64 b)
{ … }

/**
 * 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)
{ … }

u32 tfrc_calc_x(u16 s, u32 R, u32 p);
u32 tfrc_calc_x_reverse_lookup(u32 fvalue);
u32 tfrc_invert_loss_event_rate(u32 loss_event_rate);

int tfrc_tx_packet_history_init(void);
void tfrc_tx_packet_history_exit(void);
int tfrc_rx_packet_history_init(void);
void tfrc_rx_packet_history_exit(void);

int tfrc_li_init(void);
void tfrc_li_exit(void);

#ifdef CONFIG_IP_DCCP_TFRC_LIB
int tfrc_lib_init(void);
void tfrc_lib_exit(void);
#else
#define tfrc_lib_init …
#define tfrc_lib_exit …
#endif
#endif /* _TFRC_H_ */