| /* |
| * 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) |
| { |
| return (new * (EWMA_DIV - weight) + old * weight) / EWMA_DIV; |
| } |
| |
| struct minstrel_rate_stats { |
| /* current / last sampling period attempts/success counters */ |
| unsigned int attempts, last_attempts; |
| unsigned int success, last_success; |
| |
| /* total attempts/success counters */ |
| u64 att_hist, succ_hist; |
| |
| /* current throughput */ |
| unsigned int cur_tp; |
| |
| /* packet delivery probabilities */ |
| unsigned int cur_prob, probability; |
| |
| /* maximum retry counts */ |
| unsigned int retry_count; |
| unsigned int retry_count_rtscts; |
| |
| u8 sample_skipped; |
| bool retry_updated; |
| }; |
| |
| struct minstrel_rate { |
| int bitrate; |
| int rix; |
| |
| unsigned int perfect_tx_time; |
| unsigned int ack_time; |
| |
| int sample_limit; |
| unsigned int retry_count_cts; |
| unsigned int adjusted_retry_count; |
| |
| struct minstrel_rate_stats stats; |
| }; |
| |
| struct minstrel_sta_info { |
| struct ieee80211_sta *sta; |
| |
| unsigned long 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 CPTCFG_MAC80211_DEBUGFS |
| struct dentry *dbg_stats; |
| #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 CPTCFG_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); |
| |
| /* debugfs */ |
| int minstrel_stats_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 |
