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5f63afe028
Reduces per-rate data structure size Signed-off-by: Felix Fietkau <nbd@nbd.name> Link: https://lore.kernel.org/r/20191008171139.96476-3-nbd@nbd.name Signed-off-by: Johannes Berg <johannes.berg@intel.com>
186 lines
3.9 KiB
C
186 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
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*/
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#ifndef __RC_MINSTREL_H
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#define __RC_MINSTREL_H
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#define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */
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#define EWMA_DIV 128
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#define SAMPLE_COLUMNS 10 /* number of columns in sample table */
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/* scaled fraction values */
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#define MINSTREL_SCALE 12
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#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
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#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
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/* number of highest throughput rates to consider*/
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#define MAX_THR_RATES 4
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/*
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* Coefficients for moving average with noise filter (period=16),
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* scaled by 10 bits
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*
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* a1 = exp(-pi * sqrt(2) / period)
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* coeff2 = 2 * a1 * cos(sqrt(2) * 2 * pi / period)
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* coeff3 = -sqr(a1)
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* coeff1 = 1 - coeff2 - coeff3
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*/
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#define MINSTREL_AVG_COEFF1 (MINSTREL_FRAC(1, 1) - \
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MINSTREL_AVG_COEFF2 - \
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MINSTREL_AVG_COEFF3)
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#define MINSTREL_AVG_COEFF2 0x00001499
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#define MINSTREL_AVG_COEFF3 -0x0000092e
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/*
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* Perform EWMA (Exponentially Weighted Moving Average) calculation
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*/
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static inline int
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minstrel_ewma(int old, int new, int weight)
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{
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int diff, incr;
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diff = new - old;
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incr = (EWMA_DIV - weight) * diff / EWMA_DIV;
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return old + incr;
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}
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static inline int minstrel_filter_avg_add(u16 *prev_1, u16 *prev_2, s32 in)
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{
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s32 out_1 = *prev_1;
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s32 out_2 = *prev_2;
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s32 val;
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if (!in)
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in += 1;
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if (!out_1) {
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val = out_1 = in;
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goto out;
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}
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val = MINSTREL_AVG_COEFF1 * in;
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val += MINSTREL_AVG_COEFF2 * out_1;
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val += MINSTREL_AVG_COEFF3 * out_2;
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val >>= MINSTREL_SCALE;
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if (val > 1 << MINSTREL_SCALE)
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val = 1 << MINSTREL_SCALE;
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if (val < 0)
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val = 1;
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out:
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*prev_2 = out_1;
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*prev_1 = val;
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return val;
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}
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struct minstrel_rate_stats {
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/* current / last sampling period attempts/success counters */
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u16 attempts, last_attempts;
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u16 success, last_success;
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/* total attempts/success counters */
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u32 att_hist, succ_hist;
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/* prob_avg - moving average of prob */
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u16 prob_avg;
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u16 prob_avg_1;
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/* maximum retry counts */
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u8 retry_count;
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u8 retry_count_rtscts;
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u8 sample_skipped;
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bool retry_updated;
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};
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struct minstrel_rate {
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int bitrate;
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s8 rix;
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u8 retry_count_cts;
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u8 adjusted_retry_count;
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unsigned int perfect_tx_time;
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unsigned int ack_time;
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int sample_limit;
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struct minstrel_rate_stats stats;
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};
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struct minstrel_sta_info {
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struct ieee80211_sta *sta;
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unsigned long last_stats_update;
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unsigned int sp_ack_dur;
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unsigned int rate_avg;
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unsigned int lowest_rix;
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u8 max_tp_rate[MAX_THR_RATES];
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u8 max_prob_rate;
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unsigned int total_packets;
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unsigned int sample_packets;
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int sample_deferred;
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unsigned int sample_row;
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unsigned int sample_column;
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int n_rates;
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struct minstrel_rate *r;
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bool prev_sample;
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/* sampling table */
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u8 *sample_table;
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};
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struct minstrel_priv {
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struct ieee80211_hw *hw;
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bool has_mrr;
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bool new_avg;
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u32 sample_switch;
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unsigned int cw_min;
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unsigned int cw_max;
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unsigned int max_retry;
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unsigned int segment_size;
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unsigned int update_interval;
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unsigned int lookaround_rate;
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unsigned int lookaround_rate_mrr;
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u8 cck_rates[4];
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#ifdef CONFIG_MAC80211_DEBUGFS
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/*
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* enable fixed rate processing per RC
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* - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx
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* - write -1 to enable RC processing again
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* - setting will be applied on next update
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*/
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u32 fixed_rate_idx;
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#endif
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};
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struct minstrel_debugfs_info {
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size_t len;
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char buf[];
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};
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extern const struct rate_control_ops mac80211_minstrel;
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void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
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/* Recalculate success probabilities and counters for a given rate using EWMA */
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void minstrel_calc_rate_stats(struct minstrel_priv *mp,
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struct minstrel_rate_stats *mrs);
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int minstrel_get_tp_avg(struct minstrel_rate *mr, int prob_avg);
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/* debugfs */
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int minstrel_stats_open(struct inode *inode, struct file *file);
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int minstrel_stats_csv_open(struct inode *inode, struct file *file);
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#endif
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