rc80211_minstrel.h revision f744bf81f7501d03f45ba23f9cf947abc3b422c9 
1/*
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
12#define EWMA_LEVEL	75	/* ewma weighting factor [%] */
13#define SAMPLE_COLUMNS	10	/* number of columns in sample table */
14
15
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)
20
21/*
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
31struct minstrel_rate {
32	int bitrate;
33	int rix;
34
35	unsigned int perfect_tx_time;
36	unsigned int ack_time;
37
38	int sample_limit;
39	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;
48	u8 sample_skipped;
49
50	/* parts per thousand */
51	u32 cur_prob;
52	u32 probability;
53
54	/* per-rate throughput */
55	u32 cur_tp;
56
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
75	unsigned int sample_row;
76	unsigned int sample_column;
77
78	int n_rates;
79	struct minstrel_rate *r;
80	bool prev_sample;
81
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;
96	unsigned int segment_size;
97	unsigned int update_interval;
98	unsigned int lookaround_rate;
99	unsigned int lookaround_rate_mrr;
100
101	u8 cck_rates[4];
102
103#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
114};
115
116struct minstrel_debugfs_info {
117	size_t len;
118	char buf[];
119};
120
121extern struct rate_control_ops mac80211_minstrel;
122void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
123void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
124
125/* 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
130#endif
131