1 #ifndef _TFRC_H_
2 #define _TFRC_H_
3 /*
4 * net/dccp/ccids/lib/tfrc.h
5 *
6 * Copyright (c) 2007 The University of Aberdeen, Scotland, UK
7 * Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
8 * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
9 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
10 * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 */
17 #include <linux/types.h>
18 #include <linux/math64.h>
19 #include "../../dccp.h"
20
21 /* internal includes that this library exports: */
22 #include "loss_interval.h"
23 #include "packet_history.h"
24
25 #ifdef CONFIG_IP_DCCP_TFRC_DEBUG
26 extern int tfrc_debug;
27 #define tfrc_pr_debug(format, a...) DCCP_PR_DEBUG(tfrc_debug, format, ##a)
28 #else
29 #define tfrc_pr_debug(format, a...)
30 #endif
31
32 /* integer-arithmetic divisions of type (a * 1000000)/b */
33 static inline u64 scaled_div(u64 a, u64 b)
34 {
35 BUG_ON(b==0);
36 return div64_u64(a * 1000000, b);
37 }
38
39 static inline u32 scaled_div32(u64 a, u64 b)
40 {
41 u64 result = scaled_div(a, b);
42
43 if (result > UINT_MAX) {
44 DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX",
45 (unsigned long long)a, (unsigned long long)b);
46 return UINT_MAX;
47 }
48 return result;
49 }
50
51 /**
52 * tfrc_ewma - Exponentially weighted moving average
53 * @weight: Weight to be used as damping factor, in units of 1/10
54 */
55 static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight)
56 {
57 return avg ? (weight * avg + (10 - weight) * newval) / 10 : newval;
58 }
59
60 extern u32 tfrc_calc_x(u16 s, u32 R, u32 p);
61 extern u32 tfrc_calc_x_reverse_lookup(u32 fvalue);
62
63 extern int tfrc_tx_packet_history_init(void);
64 extern void tfrc_tx_packet_history_exit(void);
65 extern int tfrc_rx_packet_history_init(void);
66 extern void tfrc_rx_packet_history_exit(void);
67
68 extern int tfrc_li_init(void);
69 extern void tfrc_li_exit(void);
70
71 #ifdef CONFIG_IP_DCCP_TFRC_LIB
72 extern int tfrc_lib_init(void);
73 extern void tfrc_lib_exit(void);
74 #else
75 #define tfrc_lib_init() (0)
76 #define tfrc_lib_exit()
77 #endif
78 #endif /* _TFRC_H_ */
79
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