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mac80211: merge EWMA calculation of minstrel_ht and minstrel

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Both rate control algorithms (minstrel and minstrel_ht) calculate
averages based on EWMA. Shift function minstrel_ewma() into
rc80211_minstrel.h and make use of it in both minstrel version.
Also shift the default EWMA level (75%) definition to the header file
and clean up variable usage.

Acked-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Thomas Huehn
2013-03-04 23:30:01 +01:00
committed by Johannes Berg
parent 52c00a37a3
commit a512d4b543
3 changed files with 17 additions and 21 deletions
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13
net/mac80211/rc80211_minstrel.h
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@@ -9,6 +9,18 @@
#ifndef __RC_MINSTREL_H
#define __RC_MINSTREL_H
#define EWMA_LEVEL 75 /* ewma weighting factor [%] */
/*
* Perform EWMA (Exponentially Weighted Moving Average) calculation
*/
static inline int
minstrel_ewma(int old, int new, int weight)
{
return (new * (100 - weight) + old * weight) / 100;
}
struct minstrel_rate {
int bitrate;
int rix;
@@ -73,7 +85,6 @@ struct minstrel_priv {
unsigned int cw_min;
unsigned int cw_max;
unsigned int max_retry;
unsigned int ewma_level;
unsigned int segment_size;
unsigned int update_interval;
unsigned int lookaround_rate;