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
35 struct minstrel_rate {
36 int bitrate;
37 int rix;
38
39 unsigned int perfect_tx_time;
40 unsigned int ack_time;
41
42 int sample_limit;
43 unsigned int retry_count;
44 unsigned int retry_count_cts;
45 unsigned int retry_count_rtscts;
46 unsigned int adjusted_retry_count;
47
48 u32 success;
49 u32 attempts;
50 u32 last_attempts;
51 u32 last_success;
52 u8 sample_skipped;
53
54 /* parts per thousand */
55 u32 cur_prob;
56 u32 probability;
57
58 /* per-rate throughput */
59 u32 cur_tp;
60
61 u64 succ_hist;
62 u64 att_hist;
63 };
64
65 struct minstrel_sta_info {
66 struct ieee80211_sta *sta;
67
68 unsigned long stats_update;
69 unsigned int sp_ack_dur;
70 unsigned int rate_avg;
71
72 unsigned int lowest_rix;
73
74 u8 max_tp_rate[MAX_THR_RATES];
75 u8 max_prob_rate;
76 unsigned int packet_count;
77 unsigned int sample_count;
78 int sample_deferred;
79
80 unsigned int sample_row;
81 unsigned int sample_column;
82
83 int n_rates;
84 struct minstrel_rate *r;
85 bool prev_sample;
86
87 /* sampling table */
88 u8 *sample_table;
89
90 #ifdef CONFIG_MAC80211_DEBUGFS
91 struct dentry *dbg_stats;
92 #endif
93 };
94
95 struct minstrel_priv {
96 struct ieee80211_hw *hw;
97 bool has_mrr;
98 unsigned int cw_min;
99 unsigned int cw_max;
100 unsigned int max_retry;
101 unsigned int segment_size;
102 unsigned int update_interval;
103 unsigned int lookaround_rate;
104 unsigned int lookaround_rate_mrr;
105
106 u8 cck_rates[4];
107
108 #ifdef CONFIG_MAC80211_DEBUGFS
109 /*
110 * enable fixed rate processing per RC
111 * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx
112 * - write -1 to enable RC processing again
113 * - setting will be applied on next update
114 */
115 u32 fixed_rate_idx;
116 struct dentry *dbg_fixed_rate;
117 #endif
118
119 };
120
121 struct minstrel_debugfs_info {
122 size_t len;
123 char buf[];
124 };
125
126 extern struct rate_control_ops mac80211_minstrel;
127 void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
128 void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
129
130 /* debugfs */
131 int minstrel_stats_open(struct inode *inode, struct file *file);
132 ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
133 int minstrel_stats_release(struct inode *inode, struct file *file);
134
135 #endif
136