git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 36729c1a ACM |
1 | #ifndef _TFRC_H_ |
| 2 | #define _TFRC_H_ | |
| 3 | /* | |
| c40616c5 GR |
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 | |
| 36729c1a ACM |
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 | */ | |
| 36729c1a | 15 | #include <linux/types.h> |
| 7deb0f85 | 16 | #include <linux/math64.h> |
| c40616c5 | 17 | #include "../../dccp.h" |
| 129fa447 GR |
18 | |
| 19 | /* internal includes that this library exports: */ | |
| 8a9c7e92 GR |
20 | #include "loss_interval.h" |
| 21 | #include "packet_history.h" | |
| c40616c5 GR |
22 | |
| 23 | #ifdef CONFIG_IP_DCCP_TFRC_DEBUG | |
| 24 | extern int tfrc_debug; | |
| 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 | |
| d63d8364 GR |
29 | |
| 30 | /* integer-arithmetic divisions of type (a * 1000000)/b */ | |
| 7deb0f85 | 31 | static inline u64 scaled_div(u64 a, u64 b) |
| d63d8364 | 32 | { |
| aa1b1ff0 | 33 | BUG_ON(b == 0); |
| 7deb0f85 | 34 | return div64_u64(a * 1000000, b); |
| d63d8364 GR |
35 | } |
| 36 | ||
| 7deb0f85 | 37 | static inline u32 scaled_div32(u64 a, u64 b) |
| d63d8364 GR |
38 | { |
| 39 | u64 result = scaled_div(a, b); | |
| 40 | ||
| 41 | if (result > UINT_MAX) { | |
| 7deb0f85 GR |
42 | DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX", |
| 43 | (unsigned long long)a, (unsigned long long)b); | |
| d63d8364 GR |
44 | return UINT_MAX; |
| 45 | } | |
| 46 | return result; | |
| 47 | } | |
| 36729c1a | 48 | |
| c3ada46a GR |
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 | ||
| 1e2f0e5e GR |
58 | extern u32 tfrc_calc_x(u16 s, u32 R, u32 p); |
| 59 | extern u32 tfrc_calc_x_reverse_lookup(u32 fvalue); | |
| 36729c1a | 60 | |
| 1e2f0e5e GR |
61 | extern int tfrc_tx_packet_history_init(void); |
| 62 | extern void tfrc_tx_packet_history_exit(void); | |
| 63 | extern int tfrc_rx_packet_history_init(void); | |
| 64 | extern void tfrc_rx_packet_history_exit(void); | |
| 65 | ||
| 66 | extern int tfrc_li_init(void); | |
| 67 | extern void tfrc_li_exit(void); | |
| 129fa447 GR |
68 | |
| 69 | #ifdef CONFIG_IP_DCCP_TFRC_LIB | |
| 70 | extern int tfrc_lib_init(void); | |
| 71 | extern void tfrc_lib_exit(void); | |
| 72 | #else | |
| 73 | #define tfrc_lib_init() (0) | |
| 74 | #define tfrc_lib_exit() | |
| 75 | #endif | |
| 36729c1a | 76 | #endif /* _TFRC_H_ */ |