| #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_ */ |