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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 | ||
a512d4b5 | 16 | |
c8ca8c2f TH |
17 | /* scaled fraction values */ |
18 | #define MINSTREL_SCALE 16 | |
19 | #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div) | |
20 | #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE) | |
21 | ||
2ff2b690 TH |
22 | /* number of highest throughput rates to consider*/ |
23 | #define MAX_THR_RATES 4 | |
24 | ||
a512d4b5 TH |
25 | /* |
26 | * Perform EWMA (Exponentially Weighted Moving Average) calculation | |
27 | */ | |
28 | static inline int | |
29 | minstrel_ewma(int old, int new, int weight) | |
30 | { | |
eea85999 | 31 | return (new * (EWMA_DIV - weight) + old * weight) / EWMA_DIV; |
a512d4b5 TH |
32 | } |
33 | ||
ca12c0c8 TH |
34 | struct minstrel_rate_stats { |
35 | /* current / last sampling period attempts/success counters */ | |
36 | unsigned int attempts, last_attempts; | |
37 | unsigned int success, last_success; | |
38 | ||
39 | /* total attempts/success counters */ | |
40 | u64 att_hist, succ_hist; | |
41 | ||
42 | /* current throughput */ | |
43 | unsigned int cur_tp; | |
44 | ||
45 | /* packet delivery probabilities */ | |
46 | unsigned int cur_prob, probability; | |
47 | ||
48 | /* maximum retry counts */ | |
49 | unsigned int retry_count; | |
50 | unsigned int retry_count_rtscts; | |
51 | ||
52 | u8 sample_skipped; | |
53 | bool retry_updated; | |
54 | }; | |
a512d4b5 | 55 | |
cccf129f FF |
56 | struct minstrel_rate { |
57 | int bitrate; | |
58 | int rix; | |
59 | ||
60 | unsigned int perfect_tx_time; | |
61 | unsigned int ack_time; | |
62 | ||
f4a8cd94 | 63 | int sample_limit; |
cccf129f | 64 | unsigned int retry_count_cts; |
cccf129f FF |
65 | unsigned int adjusted_retry_count; |
66 | ||
ca12c0c8 | 67 | struct minstrel_rate_stats stats; |
cccf129f FF |
68 | }; |
69 | ||
70 | struct minstrel_sta_info { | |
06d961a8 FF |
71 | struct ieee80211_sta *sta; |
72 | ||
cccf129f FF |
73 | unsigned long stats_update; |
74 | unsigned int sp_ack_dur; | |
75 | unsigned int rate_avg; | |
76 | ||
77 | unsigned int lowest_rix; | |
78 | ||
2ff2b690 TH |
79 | u8 max_tp_rate[MAX_THR_RATES]; |
80 | u8 max_prob_rate; | |
ca12c0c8 TH |
81 | unsigned int total_packets; |
82 | unsigned int sample_packets; | |
cccf129f FF |
83 | int sample_deferred; |
84 | ||
8f157611 | 85 | unsigned int sample_row; |
cccf129f FF |
86 | unsigned int sample_column; |
87 | ||
88 | int n_rates; | |
89 | struct minstrel_rate *r; | |
f4a8cd94 | 90 | bool prev_sample; |
cccf129f FF |
91 | |
92 | /* sampling table */ | |
93 | u8 *sample_table; | |
94 | ||
95 | #ifdef CONFIG_MAC80211_DEBUGFS | |
96 | struct dentry *dbg_stats; | |
97 | #endif | |
98 | }; | |
99 | ||
100 | struct minstrel_priv { | |
101 | struct ieee80211_hw *hw; | |
102 | bool has_mrr; | |
103 | unsigned int cw_min; | |
104 | unsigned int cw_max; | |
105 | unsigned int max_retry; | |
cccf129f FF |
106 | unsigned int segment_size; |
107 | unsigned int update_interval; | |
108 | unsigned int lookaround_rate; | |
109 | unsigned int lookaround_rate_mrr; | |
24f7580e | 110 | |
a0497f9f FF |
111 | u8 cck_rates[4]; |
112 | ||
24f7580e ZK |
113 | #ifdef CONFIG_MAC80211_DEBUGFS |
114 | /* | |
115 | * enable fixed rate processing per RC | |
116 | * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx | |
117 | * - write -1 to enable RC processing again | |
118 | * - setting will be applied on next update | |
119 | */ | |
120 | u32 fixed_rate_idx; | |
121 | struct dentry *dbg_fixed_rate; | |
122 | #endif | |
123 | ||
cccf129f FF |
124 | }; |
125 | ||
44ac91ea FF |
126 | struct minstrel_debugfs_info { |
127 | size_t len; | |
128 | char buf[]; | |
129 | }; | |
130 | ||
631ad703 | 131 | extern const struct rate_control_ops mac80211_minstrel; |
cccf129f FF |
132 | void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir); |
133 | void minstrel_remove_sta_debugfs(void *priv, void *priv_sta); | |
134 | ||
eae44756 FF |
135 | /* debugfs */ |
136 | int minstrel_stats_open(struct inode *inode, struct file *file); | |
137 | ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos); | |
138 | int minstrel_stats_release(struct inode *inode, struct file *file); | |
139 | ||
cccf129f | 140 | #endif |