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
12 #define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */
13 #define EWMA_DIV 128
14 #define SAMPLE_COLUMNS 10 /* number of columns in sample table */
15
16
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
22 /* number of highest throughput rates to consider*/
23 #define MAX_THR_RATES 4
24
25 /*
26 * Perform EWMA (Exponentially Weighted Moving Average) calculation
27 */
28 static inline int
minstrel_ewma(int old,int new,int weight)29 minstrel_ewma(int old, int new, int weight)
30 {
31 return (new * (EWMA_DIV - weight) + old * weight) / EWMA_DIV;
32 }
33
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 };
55
56 struct minstrel_rate {
57 int bitrate;
58 int rix;
59
60 unsigned int perfect_tx_time;
61 unsigned int ack_time;
62
63 int sample_limit;
64 unsigned int retry_count_cts;
65 unsigned int adjusted_retry_count;
66
67 struct minstrel_rate_stats stats;
68 };
69
70 struct minstrel_sta_info {
71 struct ieee80211_sta *sta;
72
73 unsigned long stats_update;
74 unsigned int sp_ack_dur;
75 unsigned int rate_avg;
76
77 unsigned int lowest_rix;
78
79 u8 max_tp_rate[MAX_THR_RATES];
80 u8 max_prob_rate;
81 unsigned int total_packets;
82 unsigned int sample_packets;
83 int sample_deferred;
84
85 unsigned int sample_row;
86 unsigned int sample_column;
87
88 int n_rates;
89 struct minstrel_rate *r;
90 bool prev_sample;
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;
106 unsigned int segment_size;
107 unsigned int update_interval;
108 unsigned int lookaround_rate;
109 unsigned int lookaround_rate_mrr;
110
111 u8 cck_rates[4];
112
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
124 };
125
126 struct minstrel_debugfs_info {
127 size_t len;
128 char buf[];
129 };
130
131 extern const struct rate_control_ops mac80211_minstrel;
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
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
140 #endif
141