1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
6 #ifndef __RC_MINSTREL_H
7 #define __RC_MINSTREL_H
9 #define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */
11 #define SAMPLE_COLUMNS 10 /* number of columns in sample table */
13 /* scaled fraction values */
14 #define MINSTREL_SCALE 12
15 #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
16 #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
18 /* number of highest throughput rates to consider*/
19 #define MAX_THR_RATES 4
22 * Perform EWMA (Exponentially Weighted Moving Average) calculation
25 minstrel_ewma(int old, int new, int weight)
30 incr = (EWMA_DIV - weight) * diff / EWMA_DIV;
35 struct minstrel_rate_stats {
36 /* current / last sampling period attempts/success counters */
37 u16 attempts, last_attempts;
38 u16 success, last_success;
40 /* total attempts/success counters */
41 u32 att_hist, succ_hist;
43 /* prob_ewma - exponential weighted moving average of prob */
46 /* maximum retry counts */
48 u8 retry_count_rtscts;
54 struct minstrel_rate {
59 u8 adjusted_retry_count;
61 unsigned int perfect_tx_time;
62 unsigned int ack_time;
66 struct minstrel_rate_stats stats;
69 struct minstrel_sta_info {
70 struct ieee80211_sta *sta;
72 unsigned long last_stats_update;
73 unsigned int sp_ack_dur;
74 unsigned int rate_avg;
76 unsigned int lowest_rix;
78 u8 max_tp_rate[MAX_THR_RATES];
80 unsigned int total_packets;
81 unsigned int sample_packets;
84 unsigned int sample_row;
85 unsigned int sample_column;
88 struct minstrel_rate *r;
95 struct minstrel_priv {
96 struct ieee80211_hw *hw;
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;
108 #ifdef CONFIG_MAC80211_DEBUGFS
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
119 struct minstrel_debugfs_info {
124 extern const struct rate_control_ops mac80211_minstrel;
125 void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
127 /* Recalculate success probabilities and counters for a given rate using EWMA */
128 void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs);
129 int minstrel_get_tp_avg(struct minstrel_rate *mr, int prob_ewma);
132 int minstrel_stats_open(struct inode *inode, struct file *file);
133 int minstrel_stats_csv_open(struct inode *inode, struct file *file);