LXR linux/net/mac80211/rc80211

   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  */
  28static inline int
  29minstrel_ewma(int old, int new, int weight)
  30{
  31        return (new * (EWMA_DIV - weight) + old * weight) / EWMA_DIV;
  32}
  33
  34
  35struct 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
  65struct 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
  95struct 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
 121struct minstrel_debugfs_info {
 122        size_t len;
 123        char buf[];
 124};
 125
 126extern struct rate_control_ops mac80211_minstrel;
 127void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
 128void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
 129
 130/* debugfs */
 131int minstrel_stats_open(struct inode *inode, struct file *file);
 132ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
 133int minstrel_stats_release(struct inode *inode, struct file *file);
 134
 135#endif
 136