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review.trustedfirmware.org / hafnium / third_party / linux / 0e64123141f3854e695eb4924d82b52856691466 / . / net / mac80211 / rc80211_minstrel.h
blob: 3112d85a014dfde56688f7553ca64c644a64bb34 [file] [log] [blame]
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0-only */
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]2/*
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]4 */
5
6#ifndef __RC_MINSTREL_H
7#define __RC_MINSTREL_H
8
9#define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */
10#define EWMA_DIV 128
11#define SAMPLE_COLUMNS 10 /* number of columns in sample table */
12
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)
17
18/* number of highest throughput rates to consider*/
19#define MAX_THR_RATES 4
20
21/*
22 * Perform EWMA (Exponentially Weighted Moving Average) calculation
23 */
24static inline int
25minstrel_ewma(int old, int new, int weight)
26{
27 int diff, incr;
28
29 diff = new - old;
30 incr = (EWMA_DIV - weight) * diff / EWMA_DIV;
31
32 return old + incr;
33}
34
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]35struct minstrel_rate_stats {
36 /* current / last sampling period attempts/success counters */
37 u16 attempts, last_attempts;
38 u16 success, last_success;
39
40 /* total attempts/success counters */
41 u32 att_hist, succ_hist;
42
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame]43 /* prob_ewma - exponential weighted moving average of prob */
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]44 u16 prob_ewma;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]45
46 /* maximum retry counts */
47 u8 retry_count;
48 u8 retry_count_rtscts;
49
50 u8 sample_skipped;
51 bool retry_updated;
52};
53
54struct minstrel_rate {
55 int bitrate;
56
57 s8 rix;
58 u8 retry_count_cts;
59 u8 adjusted_retry_count;
60
61 unsigned int perfect_tx_time;
62 unsigned int ack_time;
63
64 int sample_limit;
65
66 struct minstrel_rate_stats stats;
67};
68
69struct minstrel_sta_info {
70 struct ieee80211_sta *sta;
71
72 unsigned long last_stats_update;
73 unsigned int sp_ack_dur;
74 unsigned int rate_avg;
75
76 unsigned int lowest_rix;
77
78 u8 max_tp_rate[MAX_THR_RATES];
79 u8 max_prob_rate;
80 unsigned int total_packets;
81 unsigned int sample_packets;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]82
83 unsigned int sample_row;
84 unsigned int sample_column;
85
86 int n_rates;
87 struct minstrel_rate *r;
88 bool prev_sample;
89
90 /* sampling table */
91 u8 *sample_table;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]92};
93
94struct minstrel_priv {
95 struct ieee80211_hw *hw;
96 bool has_mrr;
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame]97 u32 sample_switch;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]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;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]116#endif
117};
118
119struct minstrel_debugfs_info {
120 size_t len;
121 char buf[];
122};
123
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]124extern const struct rate_control_ops mac80211_minstrel;
125void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]126
127/* Recalculate success probabilities and counters for a given rate using EWMA */
128void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs);
129int minstrel_get_tp_avg(struct minstrel_rate *mr, int prob_ewma);
130
131/* debugfs */
132int minstrel_stats_open(struct inode *inode, struct file *file);
133int minstrel_stats_csv_open(struct inode *inode, struct file *file);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]134
135#endif