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 */
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)
22 /* number of highest throughput rates to consider*/
23 #define MAX_THR_RATES 4
26 * Perform EWMA (Exponentially Weighted Moving Average) calculation
29 minstrel_ewma(int old, int new, int weight)
31 return (new * (EWMA_DIV - weight) + old * weight) / EWMA_DIV;
35 struct minstrel_rate {
39 unsigned int perfect_tx_time;
40 unsigned int ack_time;
43 unsigned int retry_count;
44 unsigned int retry_count_cts;
45 unsigned int retry_count_rtscts;
46 unsigned int adjusted_retry_count;
54 /* parts per thousand */
58 /* per-rate throughput */
65 struct minstrel_sta_info {
66 unsigned long stats_update;
67 unsigned int sp_ack_dur;
68 unsigned int rate_avg;
70 unsigned int lowest_rix;
72 u8 max_tp_rate[MAX_THR_RATES];
74 unsigned int packet_count;
75 unsigned int sample_count;
78 unsigned int sample_row;
79 unsigned int sample_column;
82 struct minstrel_rate *r;
88 #ifdef CONFIG_MAC80211_DEBUGFS
89 struct dentry *dbg_stats;
93 struct minstrel_priv {
94 struct ieee80211_hw *hw;
98 unsigned int max_retry;
99 unsigned int segment_size;
100 unsigned int update_interval;
101 unsigned int lookaround_rate;
102 unsigned int lookaround_rate_mrr;
106 #ifdef CONFIG_MAC80211_DEBUGFS
108 * enable fixed rate processing per RC
109 * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx
110 * - write -1 to enable RC processing again
111 * - setting will be applied on next update
114 struct dentry *dbg_fixed_rate;
119 struct minstrel_debugfs_info {
124 extern struct rate_control_ops mac80211_minstrel;
125 void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
126 void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
129 int minstrel_stats_open(struct inode *inode, struct file *file);
130 ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
131 int minstrel_stats_release(struct inode *inode, struct file *file);