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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/net/dccp/ccids/lib/tfrc.h
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#ifndef _TFRC_H_

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#define _TFRC_H_

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/*

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 *  Copyright (c) 2007   The University of Aberdeen, Scotland, UK

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 *  Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.

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 *  Copyright (c) 2005-6 Ian McDonald <[email protected]>

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 *  Copyright (c) 2005   Arnaldo Carvalho de Melo <[email protected]>

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 *  Copyright (c) 2003   Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon

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 *

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 *  This program is free software; you can redistribute it and/or modify

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 *  it under the terms of the GNU General Public License as published by

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 *  the Free Software Foundation; either version 2 of the License, or

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 *  (at your option) any later version.

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 */

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#include <linux/types.h>

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#include <linux/math64.h>

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#include "../../dccp.h"

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/* internal includes that this library exports: */

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#include "loss_interval.h"

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#include "packet_history.h"

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#ifdef CONFIG_IP_DCCP_TFRC_DEBUG

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extern int tfrc_debug;

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#define tfrc_pr_debug(format, a...)	DCCP_PR_DEBUG(tfrc_debug, format, ##a)

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#else

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#define tfrc_pr_debug(format, a...)

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#endif

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/* integer-arithmetic divisions of type (a * 1000000)/b */

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static inline u64 scaled_div(u64 a, u64 b)

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{

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	BUG_ON(b == 0);

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	return div64_u64(a * 1000000, b);

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}

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static inline u32 scaled_div32(u64 a, u64 b)

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{

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	u64 result = scaled_div(a, b);

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	if (result > UINT_MAX) {

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		DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX",

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			  (unsigned long long)a, (unsigned long long)b);

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		return UINT_MAX;

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	}

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	return result;

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}

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/**

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 * tfrc_ewma  -  Exponentially weighted moving average

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 * @weight: Weight to be used as damping factor, in units of 1/10

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 */

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static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight)

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{

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	return avg ? (weight * avg + (10 - weight) * newval) / 10 : newval;

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}

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extern u32  tfrc_calc_x(u16 s, u32 R, u32 p);

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extern u32  tfrc_calc_x_reverse_lookup(u32 fvalue);

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extern u32  tfrc_invert_loss_event_rate(u32 loss_event_rate);

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extern int  tfrc_tx_packet_history_init(void);

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extern void tfrc_tx_packet_history_exit(void);

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extern int  tfrc_rx_packet_history_init(void);

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extern void tfrc_rx_packet_history_exit(void);

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extern int  tfrc_li_init(void);

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extern void tfrc_li_exit(void);

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#ifdef CONFIG_IP_DCCP_TFRC_LIB

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extern int  tfrc_lib_init(void);

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extern void tfrc_lib_exit(void);

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#else

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#define tfrc_lib_init() (0)

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#define tfrc_lib_exit()

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#endif

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#endif /* _TFRC_H_ */

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