2 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
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.
9 #ifndef __RC_MINSTREL_H
10 #define __RC_MINSTREL_H
12 #define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */
14 #define SAMPLE_COLUMNS 10 /* number of columns in sample table */
16 /* scaled fraction values */
17 #define MINSTREL_SCALE 12
18 #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
19 #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
21 /* number of highest throughput rates to consider*/
22 #define MAX_THR_RATES 4
25 * Perform EWMA (Exponentially Weighted Moving Average) calculation
28 minstrel_ewma(int old, int new, int weight)
33 incr = (EWMA_DIV - weight) * diff / EWMA_DIV;
39 * Perform EWMV (Exponentially Weighted Moving Variance) calculation
42 minstrel_ewmv(int old_ewmv, int cur_prob, int prob_ewma, int weight)
46 diff = cur_prob - prob_ewma;
47 incr = (EWMA_DIV - weight) * diff / EWMA_DIV;
48 return weight * (old_ewmv + MINSTREL_TRUNC(diff * incr)) / EWMA_DIV;
51 struct minstrel_rate_stats {
52 /* current / last sampling period attempts/success counters */
53 u16 attempts, last_attempts;
54 u16 success, last_success;
56 /* total attempts/success counters */
57 u32 att_hist, succ_hist;
59 /* statistis of packet delivery probability
60 * prob_ewma - exponential weighted moving average of prob
61 * prob_ewmsd - exp. weighted moving standard deviation of prob */
65 /* maximum retry counts */
67 u8 retry_count_rtscts;
73 struct minstrel_rate {
78 u8 adjusted_retry_count;
80 unsigned int perfect_tx_time;
81 unsigned int ack_time;
85 struct minstrel_rate_stats stats;
88 struct minstrel_sta_info {
89 struct ieee80211_sta *sta;
91 unsigned long last_stats_update;
92 unsigned int sp_ack_dur;
93 unsigned int rate_avg;
95 unsigned int lowest_rix;
97 u8 max_tp_rate[MAX_THR_RATES];
99 unsigned int total_packets;
100 unsigned int sample_packets;
102 unsigned int sample_row;
103 unsigned int sample_column;
106 struct minstrel_rate *r;
112 #ifdef CONFIG_MAC80211_DEBUGFS
113 struct dentry *dbg_stats;
114 struct dentry *dbg_stats_csv;
118 struct minstrel_priv {
119 struct ieee80211_hw *hw;
123 unsigned int max_retry;
124 unsigned int segment_size;
125 unsigned int update_interval;
126 unsigned int lookaround_rate;
127 unsigned int lookaround_rate_mrr;
131 #ifdef CONFIG_MAC80211_DEBUGFS
133 * enable fixed rate processing per RC
134 * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx
135 * - write -1 to enable RC processing again
136 * - setting will be applied on next update
139 struct dentry *dbg_fixed_rate;
143 struct minstrel_debugfs_info {
148 /* Get EWMSD (Exponentially Weighted Moving Standard Deviation) * 10 */
150 minstrel_get_ewmsd10(struct minstrel_rate_stats *mrs)
152 unsigned int ewmv = mrs->prob_ewmv;
153 return int_sqrt(MINSTREL_TRUNC(ewmv * 1000 * 1000));
156 extern const struct rate_control_ops mac80211_minstrel;
157 void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
158 void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
160 /* Recalculate success probabilities and counters for a given rate using EWMA */
161 void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs);
162 int minstrel_get_tp_avg(struct minstrel_rate *mr, int prob_ewma);
165 int minstrel_stats_open(struct inode *inode, struct file *file);
166 int minstrel_stats_csv_open(struct inode *inode, struct file *file);
167 ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
168 int minstrel_stats_release(struct inode *inode, struct file *file);