44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
#ifndef _TFRC_H_
|
|
#define _TFRC_H_
|
|
/*
|
|
* net/dccp/ccids/lib/tfrc.h
|
|
*
|
|
* Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
|
|
* Copyright (c) 2005 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 <asm/div64.h>
|
|
|
|
/* integer-arithmetic divisions of type (a * 1000000)/b */
|
|
static inline u64 scaled_div(u64 a, u32 b)
|
|
{
|
|
BUG_ON(b==0);
|
|
a *= 1000000;
|
|
do_div(a, b);
|
|
return a;
|
|
}
|
|
|
|
static inline u32 scaled_div32(u64 a, u32 b)
|
|
{
|
|
u64 result = scaled_div(a, b);
|
|
|
|
if (result > UINT_MAX) {
|
|
DCCP_CRIT("Overflow: a(%llu)/b(%u) > ~0U",
|
|
(unsigned long long)a, b);
|
|
return UINT_MAX;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
extern u32 tfrc_calc_x(u16 s, u32 R, u32 p);
|
|
extern u32 tfrc_calc_x_reverse_lookup(u32 fvalue);
|
|
|
|
#endif /* _TFRC_H_ */
|