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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 96 /* ewma weighting factor [/EWMA_DIV] */ |
13 | #define EWMA_DIV 128 |
14 | #define SAMPLE_COLUMNS 10 /* number of columns in sample table */ |
15 | |
16 | |
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) |
21 | |
22 | /* number of highest throughput rates to consider*/ |
23 | #define MAX_THR_RATES 4 |
24 | |
25 | /* |
26 | * Perform EWMA (Exponentially Weighted Moving Average) calculation |
27 | */ |
28 | static inline int |
29 | minstrel_ewma(int old, int new, int weight) |
30 | { |
31 | return (new * (EWMA_DIV - weight) + old * weight) / EWMA_DIV; |
32 | } |
33 | |
34 | |
35 | struct minstrel_rate { |
36 | int bitrate; |
37 | int rix; |
38 | |
39 | unsigned int perfect_tx_time; |
40 | unsigned int ack_time; |
41 | |
42 | int sample_limit; |
43 | 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; |
52 | u8 sample_skipped; |
53 | |
54 | /* parts per thousand */ |
55 | u32 cur_prob; |
56 | u32 probability; |
57 | |
58 | /* per-rate throughput */ |
59 | u32 cur_tp; |
60 | |
61 | u64 succ_hist; |
62 | u64 att_hist; |
63 | }; |
64 | |
65 | struct minstrel_sta_info { |
66 | struct ieee80211_sta *sta; |
67 | |
68 | unsigned long stats_update; |
69 | unsigned int sp_ack_dur; |
70 | unsigned int rate_avg; |
71 | |
72 | unsigned int lowest_rix; |
73 | |
74 | u8 max_tp_rate[MAX_THR_RATES]; |
75 | u8 max_prob_rate; |
76 | unsigned int packet_count; |
77 | unsigned int sample_count; |
78 | int sample_deferred; |
79 | |
80 | unsigned int sample_row; |
81 | unsigned int sample_column; |
82 | |
83 | int n_rates; |
84 | struct minstrel_rate *r; |
85 | bool prev_sample; |
86 | |
87 | /* sampling table */ |
88 | u8 *sample_table; |
89 | |
90 | #ifdef CONFIG_MAC80211_DEBUGFS |
91 | struct dentry *dbg_stats; |
92 | #endif |
93 | }; |
94 | |
95 | struct 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; |
101 | unsigned int segment_size; |
102 | unsigned int update_interval; |
103 | unsigned int lookaround_rate; |
104 | unsigned int lookaround_rate_mrr; |
105 | |
106 | u8 cck_rates[4]; |
107 | |
108 | #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 | |
119 | }; |
120 | |
121 | struct minstrel_debugfs_info { |
122 | size_t len; |
123 | char buf[]; |
124 | }; |
125 | |
126 | extern const struct rate_control_ops mac80211_minstrel; |
127 | void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir); |
128 | void minstrel_remove_sta_debugfs(void *priv, void *priv_sta); |
129 | |
130 | /* debugfs */ |
131 | int minstrel_stats_open(struct inode *inode, struct file *file); |
132 | ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos); |
133 | int minstrel_stats_release(struct inode *inode, struct file *file); |
134 | |
135 | #endif |
136 |
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