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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 | ||
5f919abc | 38 | /* |
4f0bc9c6 | 39 | * Perform EWMV (Exponentially Weighted Moving Variance) calculation |
5f919abc TH |
40 | */ |
41 | static inline int | |
4f0bc9c6 | 42 | minstrel_ewmv(int old_ewmv, int cur_prob, int prob_ewma, int weight) |
5f919abc | 43 | { |
4f0bc9c6 | 44 | int diff, incr; |
5f919abc | 45 | |
4f0bc9c6 | 46 | diff = cur_prob - prob_ewma; |
5f919abc | 47 | incr = (EWMA_DIV - weight) * diff / EWMA_DIV; |
4f0bc9c6 | 48 | return weight * (old_ewmv + MINSTREL_TRUNC(diff * incr)) / EWMA_DIV; |
5f919abc TH |
49 | } |
50 | ||
ca12c0c8 TH |
51 | struct minstrel_rate_stats { |
52 | /* current / last sampling period attempts/success counters */ | |
8d819a92 FF |
53 | u16 attempts, last_attempts; |
54 | u16 success, last_success; | |
ca12c0c8 TH |
55 | |
56 | /* total attempts/success counters */ | |
70550df2 | 57 | u32 att_hist, succ_hist; |
ca12c0c8 | 58 | |
9134073b | 59 | /* statistis of packet delivery probability |
5f919abc TH |
60 | * prob_ewma - exponential weighted moving average of prob |
61 | * prob_ewmsd - exp. weighted moving standard deviation of prob */ | |
9134073b | 62 | unsigned int prob_ewma; |
4f0bc9c6 | 63 | u16 prob_ewmv; |
ca12c0c8 TH |
64 | |
65 | /* maximum retry counts */ | |
8d819a92 FF |
66 | u8 retry_count; |
67 | u8 retry_count_rtscts; | |
ca12c0c8 TH |
68 | |
69 | u8 sample_skipped; | |
70 | bool retry_updated; | |
71 | }; | |
a512d4b5 | 72 | |
cccf129f FF |
73 | struct minstrel_rate { |
74 | int bitrate; | |
8d819a92 FF |
75 | |
76 | s8 rix; | |
77 | u8 retry_count_cts; | |
78 | u8 adjusted_retry_count; | |
cccf129f FF |
79 | |
80 | unsigned int perfect_tx_time; | |
81 | unsigned int ack_time; | |
82 | ||
f4a8cd94 | 83 | int sample_limit; |
cccf129f | 84 | |
ca12c0c8 | 85 | struct minstrel_rate_stats stats; |
cccf129f FF |
86 | }; |
87 | ||
88 | struct minstrel_sta_info { | |
06d961a8 FF |
89 | struct ieee80211_sta *sta; |
90 | ||
9134073b | 91 | unsigned long last_stats_update; |
cccf129f FF |
92 | unsigned int sp_ack_dur; |
93 | unsigned int rate_avg; | |
94 | ||
95 | unsigned int lowest_rix; | |
96 | ||
2ff2b690 TH |
97 | u8 max_tp_rate[MAX_THR_RATES]; |
98 | u8 max_prob_rate; | |
ca12c0c8 TH |
99 | unsigned int total_packets; |
100 | unsigned int sample_packets; | |
cccf129f FF |
101 | int sample_deferred; |
102 | ||
8f157611 | 103 | unsigned int sample_row; |
cccf129f FF |
104 | unsigned int sample_column; |
105 | ||
106 | int n_rates; | |
107 | struct minstrel_rate *r; | |
f4a8cd94 | 108 | bool prev_sample; |
cccf129f FF |
109 | |
110 | /* sampling table */ | |
111 | u8 *sample_table; | |
112 | ||
113 | #ifdef CONFIG_MAC80211_DEBUGFS | |
114 | struct dentry *dbg_stats; | |
6d488517 | 115 | struct dentry *dbg_stats_csv; |
cccf129f FF |
116 | #endif |
117 | }; | |
118 | ||
119 | struct minstrel_priv { | |
120 | struct ieee80211_hw *hw; | |
121 | bool has_mrr; | |
122 | unsigned int cw_min; | |
123 | unsigned int cw_max; | |
124 | unsigned int max_retry; | |
cccf129f FF |
125 | unsigned int segment_size; |
126 | unsigned int update_interval; | |
127 | unsigned int lookaround_rate; | |
128 | unsigned int lookaround_rate_mrr; | |
24f7580e | 129 | |
a0497f9f FF |
130 | u8 cck_rates[4]; |
131 | ||
24f7580e ZK |
132 | #ifdef CONFIG_MAC80211_DEBUGFS |
133 | /* | |
134 | * enable fixed rate processing per RC | |
135 | * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx | |
136 | * - write -1 to enable RC processing again | |
137 | * - setting will be applied on next update | |
138 | */ | |
139 | u32 fixed_rate_idx; | |
140 | struct dentry *dbg_fixed_rate; | |
141 | #endif | |
cccf129f FF |
142 | }; |
143 | ||
44ac91ea FF |
144 | struct minstrel_debugfs_info { |
145 | size_t len; | |
146 | char buf[]; | |
147 | }; | |
148 | ||
4f0bc9c6 FF |
149 | /* Get EWMSD (Exponentially Weighted Moving Standard Deviation) * 10 */ |
150 | static inline int | |
151 | minstrel_get_ewmsd10(struct minstrel_rate_stats *mrs) | |
152 | { | |
153 | unsigned int ewmv = mrs->prob_ewmv; | |
154 | return int_sqrt(MINSTREL_TRUNC(ewmv * 1000 * 1000)); | |
155 | } | |
156 | ||
631ad703 | 157 | extern const struct rate_control_ops mac80211_minstrel; |
cccf129f FF |
158 | void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir); |
159 | void minstrel_remove_sta_debugfs(void *priv, void *priv_sta); | |
160 | ||
f62838bc | 161 | /* Recalculate success probabilities and counters for a given rate using EWMA */ |
9134073b | 162 | void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs); |
50e55a8e | 163 | int minstrel_get_tp_avg(struct minstrel_rate *mr, int prob_ewma); |
f62838bc | 164 | |
eae44756 FF |
165 | /* debugfs */ |
166 | int minstrel_stats_open(struct inode *inode, struct file *file); | |
6d488517 | 167 | int minstrel_stats_csv_open(struct inode *inode, struct file *file); |
eae44756 FF |
168 | ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos); |
169 | int minstrel_stats_release(struct inode *inode, struct file *file); | |
170 | ||
cccf129f | 171 | #endif |