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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
Thomas Huehnf744bf82013-03-04 23:30:05 +010012#define EWMA_LEVEL 75 /* ewma weighting factor [%] */
13#define SAMPLE_COLUMNS 10 /* number of columns in sample table */
14
Thomas Huehna512d4b2013-03-04 23:30:01 +010015
Thomas Huehnc8ca8c22013-03-04 23:30:02 +010016/* 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)
20
Thomas Huehna512d4b2013-03-04 23:30:01 +010021/*
22 * Perform EWMA (Exponentially Weighted Moving Average) calculation
23 */
24static inline int
25minstrel_ewma(int old, int new, int weight)
26{
27 return (new * (100 - weight) + old * weight) / 100;
28}
29
30
Felix Fietkaucccf1292008-10-05 18:07:45 +020031struct minstrel_rate {
32 int bitrate;
33 int rix;
34
35 unsigned int perfect_tx_time;
36 unsigned int ack_time;
37
Felix Fietkauf4a8cd92008-10-15 19:13:59 +020038 int sample_limit;
Felix Fietkaucccf1292008-10-05 18:07:45 +020039 unsigned int retry_count;
40 unsigned int retry_count_cts;
41 unsigned int retry_count_rtscts;
42 unsigned int adjusted_retry_count;
43
44 u32 success;
45 u32 attempts;
46 u32 last_attempts;
47 u32 last_success;
Thomas Huehn1e9c27d2013-03-04 23:30:04 +010048 u8 sample_skipped;
Felix Fietkaucccf1292008-10-05 18:07:45 +020049
50 /* parts per thousand */
51 u32 cur_prob;
52 u32 probability;
53
54 /* per-rate throughput */
55 u32 cur_tp;
Felix Fietkaucccf1292008-10-05 18:07:45 +020056
57 u64 succ_hist;
58 u64 att_hist;
59};
60
61struct minstrel_sta_info {
62 unsigned long stats_update;
63 unsigned int sp_ack_dur;
64 unsigned int rate_avg;
65
66 unsigned int lowest_rix;
67
68 unsigned int max_tp_rate;
69 unsigned int max_tp_rate2;
70 unsigned int max_prob_rate;
71 unsigned int packet_count;
72 unsigned int sample_count;
73 int sample_deferred;
74
Thomas Huehn8f157612013-03-04 23:30:03 +010075 unsigned int sample_row;
Felix Fietkaucccf1292008-10-05 18:07:45 +020076 unsigned int sample_column;
77
78 int n_rates;
79 struct minstrel_rate *r;
Felix Fietkauf4a8cd92008-10-15 19:13:59 +020080 bool prev_sample;
Felix Fietkaucccf1292008-10-05 18:07:45 +020081
82 /* sampling table */
83 u8 *sample_table;
84
85#ifdef CONFIG_MAC80211_DEBUGFS
86 struct dentry *dbg_stats;
87#endif
88};
89
90struct minstrel_priv {
91 struct ieee80211_hw *hw;
92 bool has_mrr;
93 unsigned int cw_min;
94 unsigned int cw_max;
95 unsigned int max_retry;
Felix Fietkaucccf1292008-10-05 18:07:45 +020096 unsigned int segment_size;
97 unsigned int update_interval;
98 unsigned int lookaround_rate;
99 unsigned int lookaround_rate_mrr;
Zefir Kurtisi24f75802011-05-20 20:29:17 +0200100
Felix Fietkaua0497f92013-02-13 10:51:08 +0100101 u8 cck_rates[4];
102
Zefir Kurtisi24f75802011-05-20 20:29:17 +0200103#ifdef CONFIG_MAC80211_DEBUGFS
104 /*
105 * enable fixed rate processing per RC
106 * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx
107 * - write -1 to enable RC processing again
108 * - setting will be applied on next update
109 */
110 u32 fixed_rate_idx;
111 struct dentry *dbg_fixed_rate;
112#endif
113
Felix Fietkaucccf1292008-10-05 18:07:45 +0200114};
115
Felix Fietkau44ac91e2010-03-01 22:17:38 +0100116struct minstrel_debugfs_info {
117 size_t len;
118 char buf[];
119};
120
Felix Fietkaueae44752010-03-01 22:21:40 +0100121extern struct rate_control_ops mac80211_minstrel;
Felix Fietkaucccf1292008-10-05 18:07:45 +0200122void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
123void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
124
Felix Fietkaueae44752010-03-01 22:21:40 +0100125/* debugfs */
126int minstrel_stats_open(struct inode *inode, struct file *file);
127ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
128int minstrel_stats_release(struct inode *inode, struct file *file);
129
Felix Fietkaucccf1292008-10-05 18:07:45 +0200130#endif