net/mac80211/rc80211_minstrel_ht.h

   1 /*
   2  * Copyright (C) 2010 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_HT_H
  10 #define __RC_MINSTREL_HT_H
  11
  12 /*
  13  * The number of streams can be changed to 2 to reduce code
  14  * size and memory footprint.
  15  */
  16 #define MINSTREL_MAX_STREAMS    3
  17 #define MINSTREL_STREAM_GROUPS  4
  18
  19 /* scaled fraction values */
  20 #define MINSTREL_SCALE  16
  21 #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
  22 #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
  23
  24 #define MCS_GROUP_RATES 8
  25
  26 struct mcs_group {
  27         u32 flags;
  28         unsigned int streams;
  29         unsigned int duration[MCS_GROUP_RATES];
  30 };
  31
  32 extern const struct mcs_group minstrel_mcs_groups[];
  33
  34 struct minstrel_rate_stats {
  35         /* current / last sampling period attempts/success counters */
  36         unsigned int attempts, last_attempts;
  37         unsigned int success, last_success;
  38
  39         /* total attempts/success counters */
  40         u64 att_hist, succ_hist;
  41
  42         /* current throughput */
  43         unsigned int cur_tp;
  44
  45         /* packet delivery probabilities */
  46         unsigned int cur_prob, probability;
  47
  48         /* maximum retry counts */
  49         unsigned int retry_count;
  50         unsigned int retry_count_rtscts;
  51
  52         bool retry_updated;
  53         u8 sample_skipped;
  54 };
  55
  56 struct minstrel_mcs_group_data {
  57         u8 index;
  58         u8 column;
  59
  60         /* bitfield of supported MCS rates of this group */
  61         u8 supported;
  62
  63         /* selected primary rates */
  64         unsigned int max_tp_rate;
  65         unsigned int max_tp_rate2;
  66         unsigned int max_prob_rate;
  67
  68         /* MCS rate statistics */
  69         struct minstrel_rate_stats rates[MCS_GROUP_RATES];
  70 };
  71
  72 struct minstrel_ht_sta {
  73         /* ampdu length (average, per sampling interval) */
  74         unsigned int ampdu_len;
  75         unsigned int ampdu_packets;
  76
  77         /* ampdu length (EWMA) */
  78         unsigned int avg_ampdu_len;
  79
  80         /* best throughput rate */
  81         unsigned int max_tp_rate;
  82
  83         /* second best throughput rate */
  84         unsigned int max_tp_rate2;
  85
  86         /* best probability rate */
  87         unsigned int max_prob_rate;
  88
  89         /* time of last status update */
  90         unsigned long stats_update;
  91
  92         /* overhead time in usec for each frame */
  93         unsigned int overhead;
  94         unsigned int overhead_rtscts;
  95
  96         unsigned int total_packets;
  97         unsigned int sample_packets;
  98
  99         /* tx flags to add for frames for this sta */
 100         u32 tx_flags;
 101
 102         u8 sample_wait;
 103         u8 sample_tries;
 104         u8 sample_count;
 105         u8 sample_slow;
 106
 107         /* current MCS group to be sampled */
 108         u8 sample_group;
 109
 110         /* MCS rate group info and statistics */
 111         struct minstrel_mcs_group_data groups[MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS];
 112 };
 113
 114 struct minstrel_ht_sta_priv {
 115         union {
 116                 struct minstrel_ht_sta ht;
 117                 struct minstrel_sta_info legacy;
 118         };
 119 #ifdef CONFIG_MAC80211_DEBUGFS
 120         struct dentry *dbg_stats;
 121 #endif
 122         void *ratelist;
 123         void *sample_table;
 124         bool is_ht;
 125 };
 126
 127 void minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
 128 void minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta);
 129
 130 #endif