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 34struct 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 u8 sample_skipped; 53 bool retry_updated; 54}; 55 56struct minstrel_rate { 57 int bitrate; 58 int rix; 59 60 unsigned int perfect_tx_time; 61 unsigned int ack_time; 62 63 int sample_limit; 64 unsigned int retry_count_cts; 65 unsigned int adjusted_retry_count; 66 67 struct minstrel_rate_stats stats; 68}; 69 70struct minstrel_sta_info { 71 struct ieee80211_sta *sta; 72 73 unsigned long stats_update; 74 unsigned int sp_ack_dur; 75 unsigned int rate_avg; 76 77 unsigned int lowest_rix; 78 79 u8 max_tp_rate[MAX_THR_RATES]; 80 u8 max_prob_rate; 81 unsigned int total_packets; 82 unsigned int sample_packets; 83 int sample_deferred; 84 85 unsigned int sample_row; 86 unsigned int sample_column; 87 88 int n_rates; 89 struct minstrel_rate *r; 90 bool prev_sample; 91 92 /* sampling table */ 93 u8 *sample_table; 94 95#ifdef CONFIG_MAC80211_DEBUGFS 96 struct dentry *dbg_stats; 97#endif 98}; 99 100struct minstrel_priv { 101 struct ieee80211_hw *hw; 102 bool has_mrr; 103 unsigned int cw_min; 104 unsigned int cw_max; 105 unsigned int max_retry; 106 unsigned int segment_size; 107 unsigned int update_interval; 108 unsigned int lookaround_rate; 109 unsigned int lookaround_rate_mrr; 110 111 u8 cck_rates[4]; 112 113#ifdef CONFIG_MAC80211_DEBUGFS 114 /* 115 * enable fixed rate processing per RC 116 * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx 117 * - write -1 to enable RC processing again 118 * - setting will be applied on next update 119 */ 120 u32 fixed_rate_idx; 121 struct dentry *dbg_fixed_rate; 122#endif 123 124}; 125 126struct minstrel_debugfs_info { 127 size_t len; 128 char buf[]; 129}; 130 131extern const struct rate_control_ops mac80211_minstrel; 132void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir); 133void minstrel_remove_sta_debugfs(void *priv, void *priv_sta); 134 135/* debugfs */ 136int minstrel_stats_open(struct inode *inode, struct file *file); 137ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos); 138int minstrel_stats_release(struct inode *inode, struct file *file); 139 140#endif 141