linux/net/mac80211/rc80211_minstrel.h
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
Based on 2 normalized pattern(s):

  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

  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 #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:55 +02:00

136 lines
2.9 KiB
C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
*/
#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 12
#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;
}
struct minstrel_rate_stats {
/* current / last sampling period attempts/success counters */
u16 attempts, last_attempts;
u16 success, last_success;
/* total attempts/success counters */
u32 att_hist, succ_hist;
/* prob_ewma - exponential weighted moving average of prob */
u16 prob_ewma;
/* 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;
};
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;
#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);
/* 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);
#endif