mac80211: add the minstrel_ht rate control algorithm
Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau
John W. Linville
parent
b4df47081b
commit
ec8aa669b8
7 changed files with 1103 additions and 0 deletions
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@ -33,6 +33,13 @@ config MAC80211_RC_MINSTREL
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---help---
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This option enables the 'minstrel' TX rate control algorithm
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config MAC80211_RC_MINSTREL_HT
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bool "Minstrel 802.11n support" if EMBEDDED
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depends on MAC80211_RC_MINSTREL
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default y
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---help---
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This option enables the 'minstrel_ht' TX rate control algorithm
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choice
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prompt "Default rate control algorithm"
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depends on MAC80211_HAS_RC
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@ -51,7 +51,11 @@ rc80211_pid-$(CONFIG_MAC80211_DEBUGFS) += rc80211_pid_debugfs.o
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rc80211_minstrel-y := rc80211_minstrel.o
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rc80211_minstrel-$(CONFIG_MAC80211_DEBUGFS) += rc80211_minstrel_debugfs.o
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rc80211_minstrel_ht-y := rc80211_minstrel_ht.o
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rc80211_minstrel_ht-$(CONFIG_MAC80211_DEBUGFS) += rc80211_minstrel_ht_debugfs.o
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mac80211-$(CONFIG_MAC80211_RC_PID) += $(rc80211_pid-y)
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mac80211-$(CONFIG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y)
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mac80211-$(CONFIG_MAC80211_RC_MINSTREL_HT) += $(rc80211_minstrel_ht-y)
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ccflags-y += -D__CHECK_ENDIAN__
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@ -704,6 +704,10 @@ static int __init ieee80211_init(void)
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if (ret)
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return ret;
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ret = rc80211_minstrel_ht_init();
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if (ret)
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goto err_minstrel;
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ret = rc80211_pid_init();
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if (ret)
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goto err_pid;
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@ -716,6 +720,8 @@ static int __init ieee80211_init(void)
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err_netdev:
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rc80211_pid_exit();
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err_pid:
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rc80211_minstrel_ht_exit();
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err_minstrel:
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rc80211_minstrel_exit();
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return ret;
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@ -724,6 +730,7 @@ static int __init ieee80211_init(void)
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static void __exit ieee80211_exit(void)
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{
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rc80211_pid_exit();
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rc80211_minstrel_ht_exit();
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rc80211_minstrel_exit();
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/*
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@ -147,5 +147,18 @@ static inline void rc80211_minstrel_exit(void)
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}
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#endif
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#ifdef CONFIG_MAC80211_RC_MINSTREL_HT
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extern int rc80211_minstrel_ht_init(void);
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extern void rc80211_minstrel_ht_exit(void);
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#else
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static inline int rc80211_minstrel_ht_init(void)
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{
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return 0;
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}
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static inline void rc80211_minstrel_ht_exit(void)
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{
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}
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#endif
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#endif /* IEEE80211_RATE_H */
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824
net/mac80211/rc80211_minstrel_ht.c
Normal file
824
net/mac80211/rc80211_minstrel_ht.c
Normal file
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@ -0,0 +1,824 @@
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/*
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* Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/debugfs.h>
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#include <linux/random.h>
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#include <linux/ieee80211.h>
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#include <net/mac80211.h>
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#include "rate.h"
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#include "rc80211_minstrel.h"
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#include "rc80211_minstrel_ht.h"
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#define AVG_PKT_SIZE 1200
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#define SAMPLE_COLUMNS 10
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#define EWMA_LEVEL 75
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/* Number of bits for an average sized packet */
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#define MCS_NBITS (AVG_PKT_SIZE << 3)
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/* Number of symbols for a packet with (bps) bits per symbol */
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#define MCS_NSYMS(bps) ((MCS_NBITS + (bps) - 1) / (bps))
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/* Transmission time for a packet containing (syms) symbols */
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#define MCS_SYMBOL_TIME(sgi, syms) \
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(sgi ? \
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((syms) * 18 + 4) / 5 : /* syms * 3.6 us */ \
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(syms) << 2 /* syms * 4 us */ \
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)
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/* Transmit duration for the raw data part of an average sized packet */
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#define MCS_DURATION(streams, sgi, bps) MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps)))
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/* MCS rate information for an MCS group */
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#define MCS_GROUP(_streams, _sgi, _ht40) { \
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.streams = _streams, \
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.flags = \
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(_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
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(_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \
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.duration = { \
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MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26), \
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MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52), \
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MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78), \
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MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104), \
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MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156), \
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MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208), \
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MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234), \
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MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) \
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} \
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}
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/*
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* To enable sufficiently targeted rate sampling, MCS rates are divided into
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* groups, based on the number of streams and flags (HT40, SGI) that they
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* use.
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*/
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const struct mcs_group minstrel_mcs_groups[] = {
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MCS_GROUP(1, 0, 0),
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MCS_GROUP(2, 0, 0),
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#if MINSTREL_MAX_STREAMS >= 3
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MCS_GROUP(3, 0, 0),
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#endif
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MCS_GROUP(1, 1, 0),
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MCS_GROUP(2, 1, 0),
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#if MINSTREL_MAX_STREAMS >= 3
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MCS_GROUP(3, 1, 0),
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#endif
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MCS_GROUP(1, 0, 1),
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MCS_GROUP(2, 0, 1),
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#if MINSTREL_MAX_STREAMS >= 3
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MCS_GROUP(3, 0, 1),
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#endif
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MCS_GROUP(1, 1, 1),
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MCS_GROUP(2, 1, 1),
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#if MINSTREL_MAX_STREAMS >= 3
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MCS_GROUP(3, 1, 1),
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#endif
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};
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static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES];
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/*
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* Perform EWMA (Exponentially Weighted Moving Average) calculation
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*/
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static int
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minstrel_ewma(int old, int new, int weight)
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{
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return (new * (100 - weight) + old * weight) / 100;
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}
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/*
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* Look up an MCS group index based on mac80211 rate information
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*/
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static int
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minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate)
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{
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int streams = (rate->idx / MCS_GROUP_RATES) + 1;
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u32 flags = IEEE80211_TX_RC_SHORT_GI | IEEE80211_TX_RC_40_MHZ_WIDTH;
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int i;
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for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) {
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if (minstrel_mcs_groups[i].streams != streams)
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continue;
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if (minstrel_mcs_groups[i].flags != (rate->flags & flags))
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continue;
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return i;
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}
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WARN_ON(1);
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return 0;
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}
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static inline struct minstrel_rate_stats *
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minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index)
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{
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return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES];
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}
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/*
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* Recalculate success probabilities and counters for a rate using EWMA
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*/
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static void
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minstrel_calc_rate_ewma(struct minstrel_priv *mp, struct minstrel_rate_stats *mr)
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{
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if (unlikely(mr->attempts > 0)) {
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mr->sample_skipped = 0;
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mr->cur_prob = MINSTREL_FRAC(mr->success, mr->attempts);
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if (!mr->att_hist)
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mr->probability = mr->cur_prob;
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else
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mr->probability = minstrel_ewma(mr->probability,
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mr->cur_prob, EWMA_LEVEL);
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mr->att_hist += mr->attempts;
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mr->succ_hist += mr->success;
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} else {
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mr->sample_skipped++;
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}
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mr->last_success = mr->success;
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mr->last_attempts = mr->attempts;
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mr->success = 0;
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mr->attempts = 0;
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}
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/*
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* Calculate throughput based on the average A-MPDU length, taking into account
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* the expected number of retransmissions and their expected length
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*/
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static void
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minstrel_ht_calc_tp(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
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int group, int rate)
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{
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struct minstrel_rate_stats *mr;
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unsigned int usecs;
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mr = &mi->groups[group].rates[rate];
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if (mr->probability < MINSTREL_FRAC(1, 10)) {
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mr->cur_tp = 0;
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return;
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}
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usecs = mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len);
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usecs += minstrel_mcs_groups[group].duration[rate];
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mr->cur_tp = MINSTREL_TRUNC((1000000 / usecs) * mr->probability);
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}
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/*
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* Update rate statistics and select new primary rates
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*
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* Rules for rate selection:
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* - max_prob_rate must use only one stream, as a tradeoff between delivery
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* probability and throughput during strong fluctuations
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* - as long as the max prob rate has a probability of more than 3/4, pick
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* higher throughput rates, even if the probablity is a bit lower
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*/
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static void
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minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
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{
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struct minstrel_mcs_group_data *mg;
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struct minstrel_rate_stats *mr;
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int cur_prob, cur_prob_tp, cur_tp, cur_tp2;
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int group, i, index;
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if (mi->ampdu_packets > 0) {
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mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
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MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL);
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mi->ampdu_len = 0;
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mi->ampdu_packets = 0;
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}
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mi->sample_slow = 0;
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mi->sample_count = 0;
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mi->max_tp_rate = 0;
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mi->max_tp_rate2 = 0;
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mi->max_prob_rate = 0;
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for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
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cur_prob = 0;
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cur_prob_tp = 0;
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cur_tp = 0;
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cur_tp2 = 0;
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mg = &mi->groups[group];
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if (!mg->supported)
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continue;
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mg->max_tp_rate = 0;
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mg->max_tp_rate2 = 0;
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mg->max_prob_rate = 0;
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mi->sample_count++;
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for (i = 0; i < MCS_GROUP_RATES; i++) {
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if (!(mg->supported & BIT(i)))
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continue;
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mr = &mg->rates[i];
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mr->retry_updated = false;
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index = MCS_GROUP_RATES * group + i;
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minstrel_calc_rate_ewma(mp, mr);
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minstrel_ht_calc_tp(mp, mi, group, i);
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if (!mr->cur_tp)
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continue;
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/* ignore the lowest rate of each single-stream group */
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if (!i && minstrel_mcs_groups[group].streams == 1)
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continue;
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if ((mr->cur_tp > cur_prob_tp && mr->probability >
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MINSTREL_FRAC(3, 4)) || mr->probability > cur_prob) {
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mg->max_prob_rate = index;
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cur_prob = mr->probability;
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}
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if (mr->cur_tp > cur_tp) {
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swap(index, mg->max_tp_rate);
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cur_tp = mr->cur_tp;
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mr = minstrel_get_ratestats(mi, index);
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}
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if (index >= mg->max_tp_rate)
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continue;
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if (mr->cur_tp > cur_tp2) {
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mg->max_tp_rate2 = index;
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cur_tp2 = mr->cur_tp;
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}
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}
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}
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/* try to sample up to half of the availble rates during each interval */
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mi->sample_count *= 4;
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cur_prob = 0;
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cur_prob_tp = 0;
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cur_tp = 0;
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cur_tp2 = 0;
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for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
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mg = &mi->groups[group];
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if (!mg->supported)
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continue;
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mr = minstrel_get_ratestats(mi, mg->max_prob_rate);
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if (cur_prob_tp < mr->cur_tp &&
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minstrel_mcs_groups[group].streams == 1) {
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mi->max_prob_rate = mg->max_prob_rate;
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cur_prob = mr->cur_prob;
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}
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mr = minstrel_get_ratestats(mi, mg->max_tp_rate);
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if (cur_tp < mr->cur_tp) {
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mi->max_tp_rate = mg->max_tp_rate;
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cur_tp = mr->cur_tp;
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}
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mr = minstrel_get_ratestats(mi, mg->max_tp_rate2);
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if (cur_tp2 < mr->cur_tp) {
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mi->max_tp_rate2 = mg->max_tp_rate2;
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cur_tp2 = mr->cur_tp;
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}
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}
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mi->stats_update = jiffies;
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}
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static bool
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minstrel_ht_txstat_valid(struct ieee80211_tx_rate *rate)
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{
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if (!rate->count)
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return false;
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if (rate->idx < 0)
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return false;
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return !!(rate->flags & IEEE80211_TX_RC_MCS);
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}
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static void
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minstrel_next_sample_idx(struct minstrel_ht_sta *mi)
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{
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struct minstrel_mcs_group_data *mg;
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for (;;) {
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mi->sample_group++;
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mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups);
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mg = &mi->groups[mi->sample_group];
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if (!mg->supported)
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continue;
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if (++mg->index >= MCS_GROUP_RATES) {
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mg->index = 0;
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if (++mg->column >= ARRAY_SIZE(sample_table))
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mg->column = 0;
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}
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break;
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}
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}
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static void
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minstrel_downgrade_rate(struct minstrel_ht_sta *mi, int *idx, bool primary)
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{
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int group, orig_group;
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orig_group = group = *idx / MCS_GROUP_RATES;
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while (group > 0) {
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group--;
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if (!mi->groups[group].supported)
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continue;
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if (minstrel_mcs_groups[group].streams >
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minstrel_mcs_groups[orig_group].streams)
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continue;
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if (primary)
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*idx = mi->groups[group].max_tp_rate;
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else
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*idx = mi->groups[group].max_tp_rate2;
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break;
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}
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}
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static void
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minstrel_aggr_check(struct minstrel_priv *mp, struct ieee80211_sta *pubsta, struct sk_buff *skb)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
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u16 tid;
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if (unlikely(!ieee80211_is_data_qos(hdr->frame_control)))
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return;
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if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE)))
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return;
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tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
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if (likely(sta->ampdu_mlme.tid_state_tx[tid] != HT_AGG_STATE_IDLE))
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return;
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ieee80211_start_tx_ba_session(pubsta, tid);
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}
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static void
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minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
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struct ieee80211_sta *sta, void *priv_sta,
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struct sk_buff *skb)
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{
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struct minstrel_ht_sta_priv *msp = priv_sta;
|
||||
struct minstrel_ht_sta *mi = &msp->ht;
|
||||
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
||||
struct ieee80211_tx_rate *ar = info->status.rates;
|
||||
struct minstrel_rate_stats *rate, *rate2;
|
||||
struct minstrel_priv *mp = priv;
|
||||
bool last = false;
|
||||
int group;
|
||||
int i = 0;
|
||||
|
||||
if (!msp->is_ht)
|
||||
return mac80211_minstrel.tx_status(priv, sband, sta, &msp->legacy, skb);
|
||||
|
||||
/* This packet was aggregated but doesn't carry status info */
|
||||
if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
|
||||
!(info->flags & IEEE80211_TX_STAT_AMPDU))
|
||||
return;
|
||||
|
||||
if (!info->status.ampdu_len) {
|
||||
info->status.ampdu_ack_len = 1;
|
||||
info->status.ampdu_len = 1;
|
||||
}
|
||||
|
||||
mi->ampdu_packets++;
|
||||
mi->ampdu_len += info->status.ampdu_len;
|
||||
|
||||
if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) {
|
||||
mi->sample_wait = 4 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len);
|
||||
mi->sample_tries = 3;
|
||||
mi->sample_count--;
|
||||
}
|
||||
|
||||
if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) {
|
||||
mi->sample_packets += info->status.ampdu_len;
|
||||
minstrel_next_sample_idx(mi);
|
||||
}
|
||||
|
||||
for (i = 0; !last; i++) {
|
||||
last = (i == IEEE80211_TX_MAX_RATES - 1) ||
|
||||
!minstrel_ht_txstat_valid(&ar[i + 1]);
|
||||
|
||||
if (!minstrel_ht_txstat_valid(&ar[i]))
|
||||
break;
|
||||
|
||||
group = minstrel_ht_get_group_idx(&ar[i]);
|
||||
rate = &mi->groups[group].rates[ar[i].idx % 8];
|
||||
|
||||
if (last && (info->flags & IEEE80211_TX_STAT_ACK))
|
||||
rate->success += info->status.ampdu_ack_len;
|
||||
|
||||
rate->attempts += ar[i].count * info->status.ampdu_len;
|
||||
}
|
||||
|
||||
/*
|
||||
* check for sudden death of spatial multiplexing,
|
||||
* downgrade to a lower number of streams if necessary.
|
||||
*/
|
||||
rate = minstrel_get_ratestats(mi, mi->max_tp_rate);
|
||||
if (rate->attempts > 30 &&
|
||||
MINSTREL_FRAC(rate->success, rate->attempts) <
|
||||
MINSTREL_FRAC(20, 100))
|
||||
minstrel_downgrade_rate(mi, &mi->max_tp_rate, true);
|
||||
|
||||
rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate2);
|
||||
if (rate->attempts > 30 &&
|
||||
MINSTREL_FRAC(rate->success, rate->attempts) <
|
||||
MINSTREL_FRAC(20, 100))
|
||||
minstrel_downgrade_rate(mi, &mi->max_tp_rate2, false);
|
||||
|
||||
if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) {
|
||||
minstrel_ht_update_stats(mp, mi);
|
||||
minstrel_aggr_check(mp, sta, skb);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
|
||||
int index)
|
||||
{
|
||||
struct minstrel_rate_stats *mr;
|
||||
const struct mcs_group *group;
|
||||
unsigned int tx_time, tx_time_rtscts, tx_time_data;
|
||||
unsigned int cw = mp->cw_min;
|
||||
unsigned int t_slot = 9; /* FIXME */
|
||||
unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len);
|
||||
|
||||
mr = minstrel_get_ratestats(mi, index);
|
||||
if (mr->probability < MINSTREL_FRAC(1, 10)) {
|
||||
mr->retry_count = 1;
|
||||
mr->retry_count_rtscts = 1;
|
||||
return;
|
||||
}
|
||||
|
||||
mr->retry_count = 2;
|
||||
mr->retry_count_rtscts = 2;
|
||||
mr->retry_updated = true;
|
||||
|
||||
group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
|
||||
tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len;
|
||||
tx_time = 2 * (t_slot + mi->overhead + tx_time_data);
|
||||
tx_time_rtscts = 2 * (t_slot + mi->overhead_rtscts + tx_time_data);
|
||||
do {
|
||||
cw = (cw << 1) | 1;
|
||||
cw = min(cw, mp->cw_max);
|
||||
tx_time += cw + t_slot + mi->overhead;
|
||||
tx_time_rtscts += cw + t_slot + mi->overhead_rtscts;
|
||||
if (tx_time_rtscts < mp->segment_size)
|
||||
mr->retry_count_rtscts++;
|
||||
} while ((tx_time < mp->segment_size) &&
|
||||
(++mr->retry_count < mp->max_retry));
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
|
||||
struct ieee80211_tx_rate *rate, int index,
|
||||
struct ieee80211_tx_rate_control *txrc,
|
||||
bool sample, bool rtscts)
|
||||
{
|
||||
const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
|
||||
struct minstrel_rate_stats *mr;
|
||||
|
||||
mr = minstrel_get_ratestats(mi, index);
|
||||
if (!mr->retry_updated)
|
||||
minstrel_calc_retransmit(mp, mi, index);
|
||||
|
||||
if (mr->probability < MINSTREL_FRAC(20, 100))
|
||||
rate->count = 2;
|
||||
else if (rtscts)
|
||||
rate->count = mr->retry_count_rtscts;
|
||||
else
|
||||
rate->count = mr->retry_count;
|
||||
|
||||
rate->flags = IEEE80211_TX_RC_MCS | group->flags;
|
||||
if (txrc->short_preamble)
|
||||
rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
|
||||
if (txrc->rts || rtscts)
|
||||
rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
|
||||
rate->idx = index % MCS_GROUP_RATES + (group->streams - 1) * MCS_GROUP_RATES;
|
||||
}
|
||||
|
||||
static inline int
|
||||
minstrel_get_duration(int index)
|
||||
{
|
||||
const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
|
||||
return group->duration[index % MCS_GROUP_RATES];
|
||||
}
|
||||
|
||||
static int
|
||||
minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
|
||||
{
|
||||
struct minstrel_rate_stats *mr;
|
||||
struct minstrel_mcs_group_data *mg;
|
||||
int sample_idx = 0;
|
||||
|
||||
if (mi->sample_wait > 0) {
|
||||
mi->sample_wait--;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (!mi->sample_tries)
|
||||
return -1;
|
||||
|
||||
mi->sample_tries--;
|
||||
mg = &mi->groups[mi->sample_group];
|
||||
sample_idx = sample_table[mg->column][mg->index];
|
||||
mr = &mg->rates[sample_idx];
|
||||
sample_idx += mi->sample_group * MCS_GROUP_RATES;
|
||||
|
||||
/*
|
||||
* When not using MRR, do not sample if the probability is already
|
||||
* higher than 95% to avoid wasting airtime
|
||||
*/
|
||||
if (!mp->has_mrr && (mr->probability > MINSTREL_FRAC(95, 100)))
|
||||
goto next;
|
||||
|
||||
/*
|
||||
* Make sure that lower rates get sampled only occasionally,
|
||||
* if the link is working perfectly.
|
||||
*/
|
||||
if (minstrel_get_duration(sample_idx) >
|
||||
minstrel_get_duration(mi->max_tp_rate)) {
|
||||
if (mr->sample_skipped < 10)
|
||||
goto next;
|
||||
|
||||
if (mi->sample_slow++ > 2)
|
||||
goto next;
|
||||
}
|
||||
|
||||
return sample_idx;
|
||||
|
||||
next:
|
||||
minstrel_next_sample_idx(mi);
|
||||
return -1;
|
||||
}
|
||||
|
||||
static void
|
||||
minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
|
||||
struct ieee80211_tx_rate_control *txrc)
|
||||
{
|
||||
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
|
||||
struct ieee80211_tx_rate *ar = info->status.rates;
|
||||
struct minstrel_ht_sta_priv *msp = priv_sta;
|
||||
struct minstrel_ht_sta *mi = &msp->ht;
|
||||
struct minstrel_priv *mp = priv;
|
||||
int sample_idx;
|
||||
|
||||
if (rate_control_send_low(sta, priv_sta, txrc))
|
||||
return;
|
||||
|
||||
if (!msp->is_ht)
|
||||
return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc);
|
||||
|
||||
info->flags |= mi->tx_flags;
|
||||
sample_idx = minstrel_get_sample_rate(mp, mi);
|
||||
if (sample_idx >= 0) {
|
||||
minstrel_ht_set_rate(mp, mi, &ar[0], sample_idx,
|
||||
txrc, true, false);
|
||||
minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate,
|
||||
txrc, false, true);
|
||||
info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
|
||||
} else {
|
||||
minstrel_ht_set_rate(mp, mi, &ar[0], mi->max_tp_rate,
|
||||
txrc, false, false);
|
||||
minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate2,
|
||||
txrc, false, true);
|
||||
}
|
||||
minstrel_ht_set_rate(mp, mi, &ar[2], mi->max_prob_rate, txrc, false, true);
|
||||
|
||||
ar[3].count = 0;
|
||||
ar[3].idx = -1;
|
||||
|
||||
mi->total_packets++;
|
||||
|
||||
/* wraparound */
|
||||
if (mi->total_packets == ~0) {
|
||||
mi->total_packets = 0;
|
||||
mi->sample_packets = 0;
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
|
||||
struct ieee80211_sta *sta, void *priv_sta,
|
||||
enum nl80211_channel_type oper_chan_type)
|
||||
{
|
||||
struct minstrel_priv *mp = priv;
|
||||
struct minstrel_ht_sta_priv *msp = priv_sta;
|
||||
struct minstrel_ht_sta *mi = &msp->ht;
|
||||
struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
|
||||
struct ieee80211_local *local = hw_to_local(mp->hw);
|
||||
u16 sta_cap = sta->ht_cap.cap;
|
||||
int ack_dur;
|
||||
int stbc;
|
||||
int i;
|
||||
|
||||
/* fall back to the old minstrel for legacy stations */
|
||||
if (sta && !sta->ht_cap.ht_supported) {
|
||||
msp->is_ht = false;
|
||||
memset(&msp->legacy, 0, sizeof(msp->legacy));
|
||||
msp->legacy.r = msp->ratelist;
|
||||
msp->legacy.sample_table = msp->sample_table;
|
||||
return mac80211_minstrel.rate_init(priv, sband, sta, &msp->legacy);
|
||||
}
|
||||
|
||||
BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) !=
|
||||
MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS);
|
||||
|
||||
msp->is_ht = true;
|
||||
memset(mi, 0, sizeof(*mi));
|
||||
mi->stats_update = jiffies;
|
||||
|
||||
ack_dur = ieee80211_frame_duration(local, 10, 60, 1, 1);
|
||||
mi->overhead = ieee80211_frame_duration(local, 0, 60, 1, 1) + ack_dur;
|
||||
mi->overhead_rtscts = mi->overhead + 2 * ack_dur;
|
||||
|
||||
mi->avg_ampdu_len = MINSTREL_FRAC(1, 1);
|
||||
|
||||
/* When using MRR, sample more on the first attempt, without delay */
|
||||
if (mp->has_mrr) {
|
||||
mi->sample_count = 16;
|
||||
mi->sample_wait = 0;
|
||||
} else {
|
||||
mi->sample_count = 8;
|
||||
mi->sample_wait = 8;
|
||||
}
|
||||
mi->sample_tries = 4;
|
||||
|
||||
stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >>
|
||||
IEEE80211_HT_CAP_RX_STBC_SHIFT;
|
||||
mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT;
|
||||
|
||||
if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING)
|
||||
mi->tx_flags |= IEEE80211_TX_CTL_LDPC;
|
||||
|
||||
if (oper_chan_type != NL80211_CHAN_HT40MINUS &&
|
||||
oper_chan_type != NL80211_CHAN_HT40PLUS)
|
||||
sta_cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(mi->groups); i++) {
|
||||
u16 req = 0;
|
||||
|
||||
mi->groups[i].supported = 0;
|
||||
if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) {
|
||||
if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
|
||||
req |= IEEE80211_HT_CAP_SGI_40;
|
||||
else
|
||||
req |= IEEE80211_HT_CAP_SGI_20;
|
||||
}
|
||||
|
||||
if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
|
||||
req |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
|
||||
|
||||
if ((sta_cap & req) != req)
|
||||
continue;
|
||||
|
||||
mi->groups[i].supported =
|
||||
mcs->rx_mask[minstrel_mcs_groups[i].streams - 1];
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband,
|
||||
struct ieee80211_sta *sta, void *priv_sta)
|
||||
{
|
||||
struct minstrel_priv *mp = priv;
|
||||
|
||||
minstrel_ht_update_caps(priv, sband, sta, priv_sta, mp->hw->conf.channel_type);
|
||||
}
|
||||
|
||||
static void
|
||||
minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband,
|
||||
struct ieee80211_sta *sta, void *priv_sta,
|
||||
u32 changed, enum nl80211_channel_type oper_chan_type)
|
||||
{
|
||||
minstrel_ht_update_caps(priv, sband, sta, priv_sta, oper_chan_type);
|
||||
}
|
||||
|
||||
static void *
|
||||
minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
|
||||
{
|
||||
struct ieee80211_supported_band *sband;
|
||||
struct minstrel_ht_sta_priv *msp;
|
||||
struct minstrel_priv *mp = priv;
|
||||
struct ieee80211_hw *hw = mp->hw;
|
||||
int max_rates = 0;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
|
||||
sband = hw->wiphy->bands[i];
|
||||
if (sband && sband->n_bitrates > max_rates)
|
||||
max_rates = sband->n_bitrates;
|
||||
}
|
||||
|
||||
msp = kzalloc(sizeof(struct minstrel_ht_sta), gfp);
|
||||
if (!msp)
|
||||
return NULL;
|
||||
|
||||
msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp);
|
||||
if (!msp->ratelist)
|
||||
goto error;
|
||||
|
||||
msp->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp);
|
||||
if (!msp->sample_table)
|
||||
goto error1;
|
||||
|
||||
return msp;
|
||||
|
||||
error1:
|
||||
kfree(msp->sample_table);
|
||||
error:
|
||||
kfree(msp);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void
|
||||
minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta)
|
||||
{
|
||||
struct minstrel_ht_sta_priv *msp = priv_sta;
|
||||
|
||||
kfree(msp->sample_table);
|
||||
kfree(msp->ratelist);
|
||||
kfree(msp);
|
||||
}
|
||||
|
||||
static void *
|
||||
minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
|
||||
{
|
||||
return mac80211_minstrel.alloc(hw, debugfsdir);
|
||||
}
|
||||
|
||||
static void
|
||||
minstrel_ht_free(void *priv)
|
||||
{
|
||||
mac80211_minstrel.free(priv);
|
||||
}
|
||||
|
||||
static struct rate_control_ops mac80211_minstrel_ht = {
|
||||
.name = "minstrel_ht",
|
||||
.tx_status = minstrel_ht_tx_status,
|
||||
.get_rate = minstrel_ht_get_rate,
|
||||
.rate_init = minstrel_ht_rate_init,
|
||||
.rate_update = minstrel_ht_rate_update,
|
||||
.alloc_sta = minstrel_ht_alloc_sta,
|
||||
.free_sta = minstrel_ht_free_sta,
|
||||
.alloc = minstrel_ht_alloc,
|
||||
.free = minstrel_ht_free,
|
||||
#ifdef CONFIG_MAC80211_DEBUGFS
|
||||
.add_sta_debugfs = minstrel_ht_add_sta_debugfs,
|
||||
.remove_sta_debugfs = minstrel_ht_remove_sta_debugfs,
|
||||
#endif
|
||||
};
|
||||
|
||||
|
||||
static void
|
||||
init_sample_table(void)
|
||||
{
|
||||
int col, i, new_idx;
|
||||
u8 rnd[MCS_GROUP_RATES];
|
||||
|
||||
memset(sample_table, 0xff, sizeof(sample_table));
|
||||
for (col = 0; col < SAMPLE_COLUMNS; col++) {
|
||||
for (i = 0; i < MCS_GROUP_RATES; i++) {
|
||||
get_random_bytes(rnd, sizeof(rnd));
|
||||
new_idx = (i + rnd[i]) % MCS_GROUP_RATES;
|
||||
|
||||
while (sample_table[col][new_idx] != 0xff)
|
||||
new_idx = (new_idx + 1) % MCS_GROUP_RATES;
|
||||
|
||||
sample_table[col][new_idx] = i;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
int __init
|
||||
rc80211_minstrel_ht_init(void)
|
||||
{
|
||||
init_sample_table();
|
||||
return ieee80211_rate_control_register(&mac80211_minstrel_ht);
|
||||
}
|
||||
|
||||
void
|
||||
rc80211_minstrel_ht_exit(void)
|
||||
{
|
||||
ieee80211_rate_control_unregister(&mac80211_minstrel_ht);
|
||||
}
|
||||
128
net/mac80211/rc80211_minstrel_ht.h
Normal file
128
net/mac80211/rc80211_minstrel_ht.h
Normal file
|
|
@ -0,0 +1,128 @@
|
|||
/*
|
||||
* Copyright (C) 2010 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_HT_H
|
||||
#define __RC_MINSTREL_HT_H
|
||||
|
||||
/*
|
||||
* The number of streams can be changed to 2 to reduce code
|
||||
* size and memory footprint.
|
||||
*/
|
||||
#define MINSTREL_MAX_STREAMS 3
|
||||
#define MINSTREL_STREAM_GROUPS 4
|
||||
|
||||
/* scaled fraction values */
|
||||
#define MINSTREL_SCALE 16
|
||||
#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
|
||||
#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
|
||||
|
||||
#define MCS_GROUP_RATES 8
|
||||
|
||||
struct mcs_group {
|
||||
u32 flags;
|
||||
unsigned int streams;
|
||||
unsigned int duration[MCS_GROUP_RATES];
|
||||
};
|
||||
|
||||
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;
|
||||
|
||||
bool retry_updated;
|
||||
u8 sample_skipped;
|
||||
};
|
||||
|
||||
struct minstrel_mcs_group_data {
|
||||
u8 index;
|
||||
u8 column;
|
||||
|
||||
/* bitfield of supported MCS rates of this group */
|
||||
u8 supported;
|
||||
|
||||
/* selected primary rates */
|
||||
unsigned int max_tp_rate;
|
||||
unsigned int max_tp_rate2;
|
||||
unsigned int max_prob_rate;
|
||||
|
||||
/* MCS rate statistics */
|
||||
struct minstrel_rate_stats rates[MCS_GROUP_RATES];
|
||||
};
|
||||
|
||||
struct minstrel_ht_sta {
|
||||
/* ampdu length (average, per sampling interval) */
|
||||
unsigned int ampdu_len;
|
||||
unsigned int ampdu_packets;
|
||||
|
||||
/* ampdu length (EWMA) */
|
||||
unsigned int avg_ampdu_len;
|
||||
|
||||
/* best throughput rate */
|
||||
unsigned int max_tp_rate;
|
||||
|
||||
/* second best throughput rate */
|
||||
unsigned int max_tp_rate2;
|
||||
|
||||
/* best probability rate */
|
||||
unsigned int max_prob_rate;
|
||||
|
||||
/* time of last status update */
|
||||
unsigned long stats_update;
|
||||
|
||||
/* overhead time in usec for each frame */
|
||||
unsigned int overhead;
|
||||
unsigned int overhead_rtscts;
|
||||
|
||||
unsigned int total_packets;
|
||||
unsigned int sample_packets;
|
||||
|
||||
/* tx flags to add for frames for this sta */
|
||||
u32 tx_flags;
|
||||
|
||||
u8 sample_wait;
|
||||
u8 sample_tries;
|
||||
u8 sample_count;
|
||||
u8 sample_slow;
|
||||
|
||||
/* current MCS group to be sampled */
|
||||
u8 sample_group;
|
||||
|
||||
/* MCS rate group info and statistics */
|
||||
struct minstrel_mcs_group_data groups[MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS];
|
||||
};
|
||||
|
||||
struct minstrel_ht_sta_priv {
|
||||
union {
|
||||
struct minstrel_ht_sta ht;
|
||||
struct minstrel_sta_info legacy;
|
||||
};
|
||||
#ifdef CONFIG_MAC80211_DEBUGFS
|
||||
struct dentry *dbg_stats;
|
||||
#endif
|
||||
void *ratelist;
|
||||
void *sample_table;
|
||||
bool is_ht;
|
||||
};
|
||||
|
||||
void minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
|
||||
void minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta);
|
||||
|
||||
#endif
|
||||
120
net/mac80211/rc80211_minstrel_ht_debugfs.c
Normal file
120
net/mac80211/rc80211_minstrel_ht_debugfs.c
Normal file
|
|
@ -0,0 +1,120 @@
|
|||
/*
|
||||
* Copyright (C) 2010 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.
|
||||
*/
|
||||
#include <linux/netdevice.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/skbuff.h>
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/ieee80211.h>
|
||||
#include <net/mac80211.h>
|
||||
#include "rc80211_minstrel.h"
|
||||
#include "rc80211_minstrel_ht.h"
|
||||
|
||||
extern const struct mcs_group minstrel_mcs_groups[];
|
||||
|
||||
static int
|
||||
minstrel_ht_stats_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct minstrel_ht_sta_priv *msp = inode->i_private;
|
||||
struct minstrel_ht_sta *mi = &msp->ht;
|
||||
struct minstrel_debugfs_info *ms;
|
||||
unsigned int i, j, tp, prob, eprob;
|
||||
char *p;
|
||||
int ret;
|
||||
|
||||
if (!msp->is_ht) {
|
||||
inode->i_private = &msp->legacy;
|
||||
ret = minstrel_stats_open(inode, file);
|
||||
inode->i_private = msp;
|
||||
return ret;
|
||||
}
|
||||
|
||||
ms = kmalloc(sizeof(*ms) + 8192, GFP_KERNEL);
|
||||
if (!ms)
|
||||
return -ENOMEM;
|
||||
|
||||
file->private_data = ms;
|
||||
p = ms->buf;
|
||||
p += sprintf(p, "type rate throughput ewma prob this prob "
|
||||
"this succ/attempt success attempts\n");
|
||||
for (i = 0; i < MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS; i++) {
|
||||
char htmode = '2';
|
||||
char gimode = 'L';
|
||||
|
||||
if (!mi->groups[i].supported)
|
||||
continue;
|
||||
|
||||
if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
|
||||
htmode = '4';
|
||||
if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI)
|
||||
gimode = 'S';
|
||||
|
||||
for (j = 0; j < MCS_GROUP_RATES; j++) {
|
||||
struct minstrel_rate_stats *mr = &mi->groups[i].rates[j];
|
||||
int idx = i * MCS_GROUP_RATES + j;
|
||||
|
||||
if (!(mi->groups[i].supported & BIT(j)))
|
||||
continue;
|
||||
|
||||
p += sprintf(p, "HT%c0/%cGI ", htmode, gimode);
|
||||
|
||||
*(p++) = (idx == mi->max_tp_rate) ? 'T' : ' ';
|
||||
*(p++) = (idx == mi->max_tp_rate2) ? 't' : ' ';
|
||||
*(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
|
||||
p += sprintf(p, "MCS%-2u", (minstrel_mcs_groups[i].streams - 1) *
|
||||
MCS_GROUP_RATES + j);
|
||||
|
||||
tp = mr->cur_tp / 10;
|
||||
prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
|
||||
eprob = MINSTREL_TRUNC(mr->probability * 1000);
|
||||
|
||||
p += sprintf(p, " %6u.%1u %6u.%1u %6u.%1u "
|
||||
"%3u(%3u) %8llu %8llu\n",
|
||||
tp / 10, tp % 10,
|
||||
eprob / 10, eprob % 10,
|
||||
prob / 10, prob % 10,
|
||||
mr->last_success,
|
||||
mr->last_attempts,
|
||||
(unsigned long long)mr->succ_hist,
|
||||
(unsigned long long)mr->att_hist);
|
||||
}
|
||||
}
|
||||
p += sprintf(p, "\nTotal packet count:: ideal %d "
|
||||
"lookaround %d\n",
|
||||
max(0, (int) mi->total_packets - (int) mi->sample_packets),
|
||||
mi->sample_packets);
|
||||
p += sprintf(p, "Average A-MPDU length: %d.%d\n",
|
||||
MINSTREL_TRUNC(mi->avg_ampdu_len),
|
||||
MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
|
||||
ms->len = p - ms->buf;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct file_operations minstrel_ht_stat_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = minstrel_ht_stats_open,
|
||||
.read = minstrel_stats_read,
|
||||
.release = minstrel_stats_release,
|
||||
};
|
||||
|
||||
void
|
||||
minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
|
||||
{
|
||||
struct minstrel_ht_sta_priv *msp = priv_sta;
|
||||
|
||||
msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp,
|
||||
&minstrel_ht_stat_fops);
|
||||
}
|
||||
|
||||
void
|
||||
minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
|
||||
{
|
||||
struct minstrel_ht_sta_priv *msp = priv_sta;
|
||||
|
||||
debugfs_remove(msp->dbg_stats);
|
||||
}
|
||||
Loading…
Reference in a new issue