diff options
Diffstat (limited to 'net/mac80211/rc80211_minstrel.h')
| -rw-r--r-- | net/mac80211/rc80211_minstrel.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h new file mode 100644 index 000000000..c230bbe93 --- /dev/null +++ b/net/mac80211/rc80211_minstrel.h @@ -0,0 +1,170 @@ +/* + * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __RC_MINSTREL_H +#define __RC_MINSTREL_H + +#define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */ +#define EWMA_DIV 128 +#define SAMPLE_COLUMNS 10 /* number of columns in sample table */ + +/* scaled fraction values */ +#define MINSTREL_SCALE 16 +#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div) +#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE) + +/* number of highest throughput rates to consider*/ +#define MAX_THR_RATES 4 + +/* + * Perform EWMA (Exponentially Weighted Moving Average) calculation + */ +static inline int +minstrel_ewma(int old, int new, int weight) +{ + int diff, incr; + + diff = new - old; + incr = (EWMA_DIV - weight) * diff / EWMA_DIV; + + return old + incr; +} + +/* + * Perform EWMSD (Exponentially Weighted Moving Standard Deviation) calculation + */ +static inline int +minstrel_ewmsd(int old_ewmsd, int cur_prob, int prob_ewma, int weight) +{ + int diff, incr, tmp_var; + + /* calculate exponential weighted moving variance */ + diff = MINSTREL_TRUNC((cur_prob - prob_ewma) * 1000000); + incr = (EWMA_DIV - weight) * diff / EWMA_DIV; + tmp_var = old_ewmsd * old_ewmsd; + tmp_var = weight * (tmp_var + diff * incr / 1000000) / EWMA_DIV; + + /* return standard deviation */ + return (u16) int_sqrt(tmp_var); +} + +struct minstrel_rate_stats { + /* current / last sampling period attempts/success counters */ + u16 attempts, last_attempts; + u16 success, last_success; + + /* total attempts/success counters */ + u64 att_hist, succ_hist; + + /* statistis of packet delivery probability + * cur_prob - current prob within last update intervall + * prob_ewma - exponential weighted moving average of prob + * prob_ewmsd - exp. weighted moving standard deviation of prob */ + unsigned int cur_prob; + unsigned int prob_ewma; + u16 prob_ewmsd; + + /* maximum retry counts */ + u8 retry_count; + u8 retry_count_rtscts; + + u8 sample_skipped; + bool retry_updated; +}; + +struct minstrel_rate { + int bitrate; + + s8 rix; + u8 retry_count_cts; + u8 adjusted_retry_count; + + unsigned int perfect_tx_time; + unsigned int ack_time; + + int sample_limit; + + struct minstrel_rate_stats stats; +}; + +struct minstrel_sta_info { + struct ieee80211_sta *sta; + + unsigned long last_stats_update; + unsigned int sp_ack_dur; + unsigned int rate_avg; + + unsigned int lowest_rix; + + u8 max_tp_rate[MAX_THR_RATES]; + u8 max_prob_rate; + unsigned int total_packets; + unsigned int sample_packets; + int sample_deferred; + + unsigned int sample_row; + unsigned int sample_column; + + int n_rates; + struct minstrel_rate *r; + bool prev_sample; + + /* sampling table */ + u8 *sample_table; + +#ifdef CONFIG_MAC80211_DEBUGFS + struct dentry *dbg_stats; + struct dentry *dbg_stats_csv; +#endif +}; + +struct minstrel_priv { + struct ieee80211_hw *hw; + bool has_mrr; + unsigned int cw_min; + unsigned int cw_max; + unsigned int max_retry; + unsigned int segment_size; + unsigned int update_interval; + unsigned int lookaround_rate; + unsigned int lookaround_rate_mrr; + + u8 cck_rates[4]; + +#ifdef CONFIG_MAC80211_DEBUGFS + /* + * enable fixed rate processing per RC + * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx + * - write -1 to enable RC processing again + * - setting will be applied on next update + */ + u32 fixed_rate_idx; + struct dentry *dbg_fixed_rate; +#endif +}; + +struct minstrel_debugfs_info { + size_t len; + char buf[]; +}; + +extern const struct rate_control_ops mac80211_minstrel; +void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir); +void minstrel_remove_sta_debugfs(void *priv, void *priv_sta); + +/* Recalculate success probabilities and counters for a given rate using EWMA */ +void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs); +int minstrel_get_tp_avg(struct minstrel_rate *mr, int prob_ewma); + +/* debugfs */ +int minstrel_stats_open(struct inode *inode, struct file *file); +int minstrel_stats_csv_open(struct inode *inode, struct file *file); +ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos); +int minstrel_stats_release(struct inode *inode, struct file *file); + +#endif |