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cccf129f FF |
1 | /* |
2 | * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #ifndef __RC_MINSTREL_H | |
10 | #define __RC_MINSTREL_H | |
11 | ||
eea85999 KB |
12 | #define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */ |
13 | #define EWMA_DIV 128 | |
f744bf81 TH |
14 | #define SAMPLE_COLUMNS 10 /* number of columns in sample table */ |
15 | ||
c8ca8c2f | 16 | /* scaled fraction values */ |
0217eefa | 17 | #define MINSTREL_SCALE 12 |
c8ca8c2f TH |
18 | #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div) |
19 | #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE) | |
20 | ||
2ff2b690 TH |
21 | /* number of highest throughput rates to consider*/ |
22 | #define MAX_THR_RATES 4 | |
23 | ||
a512d4b5 TH |
24 | /* |
25 | * Perform EWMA (Exponentially Weighted Moving Average) calculation | |
6d488517 | 26 | */ |
a512d4b5 TH |
27 | static inline int |
28 | minstrel_ewma(int old, int new, int weight) | |
29 | { | |
ade6d4a2 TH |
30 | int diff, incr; |
31 | ||
32 | diff = new - old; | |
33 | incr = (EWMA_DIV - weight) * diff / EWMA_DIV; | |
34 | ||
35 | return old + incr; | |
a512d4b5 TH |
36 | } |
37 | ||
ca12c0c8 TH |
38 | struct minstrel_rate_stats { |
39 | /* current / last sampling period attempts/success counters */ | |
8d819a92 FF |
40 | u16 attempts, last_attempts; |
41 | u16 success, last_success; | |
ca12c0c8 TH |
42 | |
43 | /* total attempts/success counters */ | |
70550df2 | 44 | u32 att_hist, succ_hist; |
ca12c0c8 | 45 | |
506dbf90 | 46 | /* prob_ewma - exponential weighted moving average of prob */ |
4cae4cd1 | 47 | u16 prob_ewma; |
ca12c0c8 TH |
48 | |
49 | /* maximum retry counts */ | |
8d819a92 FF |
50 | u8 retry_count; |
51 | u8 retry_count_rtscts; | |
ca12c0c8 TH |
52 | |
53 | u8 sample_skipped; | |
54 | bool retry_updated; | |
55 | }; | |
a512d4b5 | 56 | |
cccf129f FF |
57 | struct minstrel_rate { |
58 | int bitrate; | |
8d819a92 FF |
59 | |
60 | s8 rix; | |
61 | u8 retry_count_cts; | |
62 | u8 adjusted_retry_count; | |
cccf129f FF |
63 | |
64 | unsigned int perfect_tx_time; | |
65 | unsigned int ack_time; | |
66 | ||
f4a8cd94 | 67 | int sample_limit; |
cccf129f | 68 | |
ca12c0c8 | 69 | struct minstrel_rate_stats stats; |
cccf129f FF |
70 | }; |
71 | ||
72 | struct minstrel_sta_info { | |
06d961a8 FF |
73 | struct ieee80211_sta *sta; |
74 | ||
9134073b | 75 | unsigned long last_stats_update; |
cccf129f FF |
76 | unsigned int sp_ack_dur; |
77 | unsigned int rate_avg; | |
78 | ||
79 | unsigned int lowest_rix; | |
80 | ||
2ff2b690 TH |
81 | u8 max_tp_rate[MAX_THR_RATES]; |
82 | u8 max_prob_rate; | |
ca12c0c8 TH |
83 | unsigned int total_packets; |
84 | unsigned int sample_packets; | |
cccf129f FF |
85 | int sample_deferred; |
86 | ||
8f157611 | 87 | unsigned int sample_row; |
cccf129f FF |
88 | unsigned int sample_column; |
89 | ||
90 | int n_rates; | |
91 | struct minstrel_rate *r; | |
f4a8cd94 | 92 | bool prev_sample; |
cccf129f FF |
93 | |
94 | /* sampling table */ | |
95 | u8 *sample_table; | |
cccf129f FF |
96 | }; |
97 | ||
98 | struct minstrel_priv { | |
99 | struct ieee80211_hw *hw; | |
100 | bool has_mrr; | |
101 | unsigned int cw_min; | |
102 | unsigned int cw_max; | |
103 | unsigned int max_retry; | |
cccf129f FF |
104 | unsigned int segment_size; |
105 | unsigned int update_interval; | |
106 | unsigned int lookaround_rate; | |
107 | unsigned int lookaround_rate_mrr; | |
24f7580e | 108 | |
a0497f9f FF |
109 | u8 cck_rates[4]; |
110 | ||
24f7580e ZK |
111 | #ifdef CONFIG_MAC80211_DEBUGFS |
112 | /* | |
113 | * enable fixed rate processing per RC | |
114 | * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx | |
115 | * - write -1 to enable RC processing again | |
116 | * - setting will be applied on next update | |
117 | */ | |
118 | u32 fixed_rate_idx; | |
24f7580e | 119 | #endif |
cccf129f FF |
120 | }; |
121 | ||
44ac91ea FF |
122 | struct minstrel_debugfs_info { |
123 | size_t len; | |
124 | char buf[]; | |
125 | }; | |
126 | ||
631ad703 | 127 | extern const struct rate_control_ops mac80211_minstrel; |
cccf129f | 128 | void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir); |
cccf129f | 129 | |
f62838bc | 130 | /* Recalculate success probabilities and counters for a given rate using EWMA */ |
9134073b | 131 | void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs); |
50e55a8e | 132 | int minstrel_get_tp_avg(struct minstrel_rate *mr, int prob_ewma); |
f62838bc | 133 | |
eae44756 FF |
134 | /* debugfs */ |
135 | int minstrel_stats_open(struct inode *inode, struct file *file); | |
6d488517 | 136 | int minstrel_stats_csv_open(struct inode *inode, struct file *file); |
eae44756 | 137 | |
cccf129f | 138 | #endif |