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Felix Fietkaucccf1292008-10-05 18:07:45 +02001/*
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
Karl Beldaneea85992013-04-17 13:43:22 +020012#define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */
13#define EWMA_DIV 128
Thomas Huehnf744bf82013-03-04 23:30:05 +010014#define SAMPLE_COLUMNS 10 /* number of columns in sample table */
15
Thomas Huehna512d4b2013-03-04 23:30:01 +010016
Thomas Huehnc8ca8c22013-03-04 23:30:02 +010017/* 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
Thomas Huehn2ff2b692013-03-04 23:30:07 +010022/* number of highest throughput rates to consider*/
23#define MAX_THR_RATES 4
24
Thomas Huehna512d4b2013-03-04 23:30:01 +010025/*
26 * Perform EWMA (Exponentially Weighted Moving Average) calculation
27 */
28static inline int
29minstrel_ewma(int old, int new, int weight)
30{
Karl Beldaneea85992013-04-17 13:43:22 +020031 return (new * (EWMA_DIV - weight) + old * weight) / EWMA_DIV;
Thomas Huehna512d4b2013-03-04 23:30:01 +010032}
33
34
Felix Fietkaucccf1292008-10-05 18:07:45 +020035struct minstrel_rate {
36 int bitrate;
37 int rix;
38
39 unsigned int perfect_tx_time;
40 unsigned int ack_time;
41
Felix Fietkauf4a8cd92008-10-15 19:13:59 +020042 int sample_limit;
Felix Fietkaucccf1292008-10-05 18:07:45 +020043 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;
Thomas Huehn1e9c27d2013-03-04 23:30:04 +010052 u8 sample_skipped;
Felix Fietkaucccf1292008-10-05 18:07:45 +020053
54 /* parts per thousand */
55 u32 cur_prob;
56 u32 probability;
57
58 /* per-rate throughput */
59 u32 cur_tp;
Felix Fietkaucccf1292008-10-05 18:07:45 +020060
61 u64 succ_hist;
62 u64 att_hist;
63};
64
65struct minstrel_sta_info {
Felix Fietkau06d961a2013-04-22 16:14:43 +020066 struct ieee80211_sta *sta;
67
Felix Fietkaucccf1292008-10-05 18:07:45 +020068 unsigned long stats_update;
69 unsigned int sp_ack_dur;
70 unsigned int rate_avg;
71
72 unsigned int lowest_rix;
73
Thomas Huehn2ff2b692013-03-04 23:30:07 +010074 u8 max_tp_rate[MAX_THR_RATES];
75 u8 max_prob_rate;
Felix Fietkaucccf1292008-10-05 18:07:45 +020076 unsigned int packet_count;
77 unsigned int sample_count;
78 int sample_deferred;
79
Thomas Huehn8f157612013-03-04 23:30:03 +010080 unsigned int sample_row;
Felix Fietkaucccf1292008-10-05 18:07:45 +020081 unsigned int sample_column;
82
83 int n_rates;
84 struct minstrel_rate *r;
Felix Fietkauf4a8cd92008-10-15 19:13:59 +020085 bool prev_sample;
Felix Fietkaucccf1292008-10-05 18:07:45 +020086
87 /* sampling table */
88 u8 *sample_table;
89
90#ifdef CONFIG_MAC80211_DEBUGFS
91 struct dentry *dbg_stats;
92#endif
93};
94
95struct 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;
Felix Fietkaucccf1292008-10-05 18:07:45 +0200101 unsigned int segment_size;
102 unsigned int update_interval;
103 unsigned int lookaround_rate;
104 unsigned int lookaround_rate_mrr;
Zefir Kurtisi24f75802011-05-20 20:29:17 +0200105
Felix Fietkaua0497f92013-02-13 10:51:08 +0100106 u8 cck_rates[4];
107
Zefir Kurtisi24f75802011-05-20 20:29:17 +0200108#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
Felix Fietkaucccf1292008-10-05 18:07:45 +0200119};
120
Felix Fietkau44ac91e2010-03-01 22:17:38 +0100121struct minstrel_debugfs_info {
122 size_t len;
123 char buf[];
124};
125
Felix Fietkaueae44752010-03-01 22:21:40 +0100126extern struct rate_control_ops mac80211_minstrel;
Felix Fietkaucccf1292008-10-05 18:07:45 +0200127void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
128void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
129
Felix Fietkaueae44752010-03-01 22:21:40 +0100130/* debugfs */
131int minstrel_stats_open(struct inode *inode, struct file *file);
132ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
133int minstrel_stats_release(struct inode *inode, struct file *file);
134
Felix Fietkaucccf1292008-10-05 18:07:45 +0200135#endif