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 75 /* ewma weighting factor [%] */
13 #define SAMPLE_COLUMNS 10 /* number of columns in sample table */
16 /* scaled fraction values */
17 #define MINSTREL_SCALE 16
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)
30 return (new * (100 - weight) + old * weight) / 100;
34 struct minstrel_rate {
38 unsigned int perfect_tx_time;
39 unsigned int ack_time;
42 unsigned int retry_count;
43 unsigned int retry_count_cts;
44 unsigned int retry_count_rtscts;
45 unsigned int adjusted_retry_count;
53 /* parts per thousand */
57 /* per-rate throughput */
64 struct minstrel_sta_info {
65 unsigned long stats_update;
66 unsigned int sp_ack_dur;
67 unsigned int rate_avg;
69 unsigned int lowest_rix;
71 u8 max_tp_rate[MAX_THR_RATES];
73 unsigned int packet_count;
74 unsigned int sample_count;
77 unsigned int sample_row;
78 unsigned int sample_column;
81 struct minstrel_rate *r;
87 #ifdef CONFIG_MAC80211_DEBUGFS
88 struct dentry *dbg_stats;
92 struct minstrel_priv {
93 struct ieee80211_hw *hw;
97 unsigned int max_retry;
98 unsigned int segment_size;
99 unsigned int update_interval;
100 unsigned int lookaround_rate;
101 unsigned int lookaround_rate_mrr;
105 #ifdef CONFIG_MAC80211_DEBUGFS
107 * enable fixed rate processing per RC
108 * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx
109 * - write -1 to enable RC processing again
110 * - setting will be applied on next update
113 struct dentry *dbg_fixed_rate;
118 struct minstrel_debugfs_info {
123 extern struct rate_control_ops mac80211_minstrel;
124 void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
125 void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
128 int minstrel_stats_open(struct inode *inode, struct file *file);
129 ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
130 int minstrel_stats_release(struct inode *inode, struct file *file);