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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
36729c1a ACM |
2 | #ifndef _TFRC_H_ |
3 | #define _TFRC_H_ | |
4 | /* | |
c40616c5 GR |
5 | * Copyright (c) 2007 The University of Aberdeen, Scotland, UK |
6 | * Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand. | |
7 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> | |
8 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
9 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon | |
36729c1a | 10 | */ |
36729c1a | 11 | #include <linux/types.h> |
7deb0f85 | 12 | #include <linux/math64.h> |
c40616c5 | 13 | #include "../../dccp.h" |
129fa447 GR |
14 | |
15 | /* internal includes that this library exports: */ | |
8a9c7e92 GR |
16 | #include "loss_interval.h" |
17 | #include "packet_history.h" | |
c40616c5 GR |
18 | |
19 | #ifdef CONFIG_IP_DCCP_TFRC_DEBUG | |
09db3080 | 20 | extern bool tfrc_debug; |
c40616c5 GR |
21 | #define tfrc_pr_debug(format, a...) DCCP_PR_DEBUG(tfrc_debug, format, ##a) |
22 | #else | |
23 | #define tfrc_pr_debug(format, a...) | |
24 | #endif | |
d63d8364 GR |
25 | |
26 | /* integer-arithmetic divisions of type (a * 1000000)/b */ | |
7deb0f85 | 27 | static inline u64 scaled_div(u64 a, u64 b) |
d63d8364 | 28 | { |
aa1b1ff0 | 29 | BUG_ON(b == 0); |
7deb0f85 | 30 | return div64_u64(a * 1000000, b); |
d63d8364 GR |
31 | } |
32 | ||
7deb0f85 | 33 | static inline u32 scaled_div32(u64 a, u64 b) |
d63d8364 GR |
34 | { |
35 | u64 result = scaled_div(a, b); | |
36 | ||
37 | if (result > UINT_MAX) { | |
7deb0f85 GR |
38 | DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX", |
39 | (unsigned long long)a, (unsigned long long)b); | |
d63d8364 GR |
40 | return UINT_MAX; |
41 | } | |
42 | return result; | |
43 | } | |
36729c1a | 44 | |
c3ada46a GR |
45 | /** |
46 | * tfrc_ewma - Exponentially weighted moving average | |
47 | * @weight: Weight to be used as damping factor, in units of 1/10 | |
48 | */ | |
49 | static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight) | |
50 | { | |
51 | return avg ? (weight * avg + (10 - weight) * newval) / 10 : newval; | |
52 | } | |
53 | ||
a402a5aa JP |
54 | u32 tfrc_calc_x(u16 s, u32 R, u32 p); |
55 | u32 tfrc_calc_x_reverse_lookup(u32 fvalue); | |
56 | u32 tfrc_invert_loss_event_rate(u32 loss_event_rate); | |
36729c1a | 57 | |
a402a5aa JP |
58 | int tfrc_tx_packet_history_init(void); |
59 | void tfrc_tx_packet_history_exit(void); | |
60 | int tfrc_rx_packet_history_init(void); | |
61 | void tfrc_rx_packet_history_exit(void); | |
1e2f0e5e | 62 | |
a402a5aa JP |
63 | int tfrc_li_init(void); |
64 | void tfrc_li_exit(void); | |
129fa447 GR |
65 | |
66 | #ifdef CONFIG_IP_DCCP_TFRC_LIB | |
a402a5aa JP |
67 | int tfrc_lib_init(void); |
68 | void tfrc_lib_exit(void); | |
129fa447 GR |
69 | #else |
70 | #define tfrc_lib_init() (0) | |
71 | #define tfrc_lib_exit() | |
72 | #endif | |
36729c1a | 73 | #endif /* _TFRC_H_ */ |