net/mac80211/rc80211_minstrel.h

   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 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