Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 1 | #ifndef _TFRC_H_ |
| 2 | #define _TFRC_H_ |
| 3 | /* |
Gerrit Renker | c40616c | 2007-12-06 12:26:38 -0200 | [diff] [blame] | 4 | * Copyright (c) 2007 The University of Aberdeen, Scotland, UK |
| 5 | * Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand. |
| 6 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
| 7 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 8 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | */ |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 15 | #include <linux/types.h> |
Gerrit Renker | 7deb0f8 | 2008-06-11 11:19:10 +0100 | [diff] [blame] | 16 | #include <linux/math64.h> |
Gerrit Renker | c40616c | 2007-12-06 12:26:38 -0200 | [diff] [blame] | 17 | #include "../../dccp.h" |
Gerrit Renker | 129fa44 | 2009-01-04 21:45:33 -0800 | [diff] [blame] | 18 | |
| 19 | /* internal includes that this library exports: */ |
Gerrit Renker | 8a9c7e9 | 2007-12-12 13:50:51 -0200 | [diff] [blame] | 20 | #include "loss_interval.h" |
| 21 | #include "packet_history.h" |
Gerrit Renker | c40616c | 2007-12-06 12:26:38 -0200 | [diff] [blame] | 22 | |
| 23 | #ifdef CONFIG_IP_DCCP_TFRC_DEBUG |
Rusty Russell | eb93992 | 2011-12-19 14:08:01 +0000 | [diff] [blame] | 24 | extern bool tfrc_debug; |
Gerrit Renker | c40616c | 2007-12-06 12:26:38 -0200 | [diff] [blame] | 25 | #define tfrc_pr_debug(format, a...) DCCP_PR_DEBUG(tfrc_debug, format, ##a) |
| 26 | #else |
| 27 | #define tfrc_pr_debug(format, a...) |
| 28 | #endif |
Gerrit Renker | d63d836 | 2006-12-10 00:04:16 -0200 | [diff] [blame] | 29 | |
| 30 | /* integer-arithmetic divisions of type (a * 1000000)/b */ |
Gerrit Renker | 7deb0f8 | 2008-06-11 11:19:10 +0100 | [diff] [blame] | 31 | static inline u64 scaled_div(u64 a, u64 b) |
Gerrit Renker | d63d836 | 2006-12-10 00:04:16 -0200 | [diff] [blame] | 32 | { |
Gerrit Renker | aa1b1ff | 2009-09-12 07:47:01 +0000 | [diff] [blame] | 33 | BUG_ON(b == 0); |
Gerrit Renker | 7deb0f8 | 2008-06-11 11:19:10 +0100 | [diff] [blame] | 34 | return div64_u64(a * 1000000, b); |
Gerrit Renker | d63d836 | 2006-12-10 00:04:16 -0200 | [diff] [blame] | 35 | } |
| 36 | |
Gerrit Renker | 7deb0f8 | 2008-06-11 11:19:10 +0100 | [diff] [blame] | 37 | static inline u32 scaled_div32(u64 a, u64 b) |
Gerrit Renker | d63d836 | 2006-12-10 00:04:16 -0200 | [diff] [blame] | 38 | { |
| 39 | u64 result = scaled_div(a, b); |
| 40 | |
| 41 | if (result > UINT_MAX) { |
Gerrit Renker | 7deb0f8 | 2008-06-11 11:19:10 +0100 | [diff] [blame] | 42 | DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX", |
| 43 | (unsigned long long)a, (unsigned long long)b); |
Gerrit Renker | d63d836 | 2006-12-10 00:04:16 -0200 | [diff] [blame] | 44 | return UINT_MAX; |
| 45 | } |
| 46 | return result; |
| 47 | } |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 48 | |
Gerrit Renker | c3ada46 | 2007-11-20 18:09:59 -0200 | [diff] [blame] | 49 | /** |
| 50 | * tfrc_ewma - Exponentially weighted moving average |
| 51 | * @weight: Weight to be used as damping factor, in units of 1/10 |
| 52 | */ |
| 53 | static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight) |
| 54 | { |
| 55 | return avg ? (weight * avg + (10 - weight) * newval) / 10 : newval; |
| 56 | } |
| 57 | |
Gerrit Renker | 1e2f0e5 | 2008-06-11 11:19:09 +0100 | [diff] [blame] | 58 | extern u32 tfrc_calc_x(u16 s, u32 R, u32 p); |
| 59 | extern u32 tfrc_calc_x_reverse_lookup(u32 fvalue); |
Gerrit Renker | 792e6d3 | 2010-09-19 20:10:52 +0200 | [diff] [blame] | 60 | extern u32 tfrc_invert_loss_event_rate(u32 loss_event_rate); |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 61 | |
Gerrit Renker | 1e2f0e5 | 2008-06-11 11:19:09 +0100 | [diff] [blame] | 62 | extern int tfrc_tx_packet_history_init(void); |
| 63 | extern void tfrc_tx_packet_history_exit(void); |
| 64 | extern int tfrc_rx_packet_history_init(void); |
| 65 | extern void tfrc_rx_packet_history_exit(void); |
| 66 | |
| 67 | extern int tfrc_li_init(void); |
| 68 | extern void tfrc_li_exit(void); |
Gerrit Renker | 129fa44 | 2009-01-04 21:45:33 -0800 | [diff] [blame] | 69 | |
| 70 | #ifdef CONFIG_IP_DCCP_TFRC_LIB |
| 71 | extern int tfrc_lib_init(void); |
| 72 | extern void tfrc_lib_exit(void); |
| 73 | #else |
| 74 | #define tfrc_lib_init() (0) |
| 75 | #define tfrc_lib_exit() |
| 76 | #endif |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 77 | #endif /* _TFRC_H_ */ |