forked from Minki/linux
c0eb09aa7e
This was added to mitigate the effects of too much sampling on devices that use a static global fallback table instead of configurable multi-rate retry. Now that the sampling algorithm is improved, this code path no longer performs any better than the standard probing on affected devices. Signed-off-by: Felix Fietkau <nbd@nbd.name> Link: https://lore.kernel.org/r/20210127055735.78599-6-nbd@nbd.name Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1960 lines
50 KiB
C
1960 lines
50 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2019-2020 Intel Corporation
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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/moduleparam.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 "sta_info.h"
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#include "rc80211_minstrel_ht.h"
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#define AVG_AMPDU_SIZE 16
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#define AVG_PKT_SIZE 1200
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#define SAMPLE_SWITCH_THR 100
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/* Number of bits for an average sized packet */
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#define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_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) DIV_ROUND_UP(MCS_NBITS, (bps))
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/* Transmission time (nanoseconds) 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) * 18000 + 4000) / 5 : /* syms * 3.6 us */ \
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((syms) * 1000) << 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) \
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(MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps))) / AVG_AMPDU_SIZE)
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#define BW_20 0
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#define BW_40 1
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#define BW_80 2
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/*
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* Define group sort order: HT40 -> SGI -> #streams
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*/
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#define GROUP_IDX(_streams, _sgi, _ht40) \
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MINSTREL_HT_GROUP_0 + \
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MINSTREL_MAX_STREAMS * 2 * _ht40 + \
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MINSTREL_MAX_STREAMS * _sgi + \
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_streams - 1
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#define _MAX(a, b) (((a)>(b))?(a):(b))
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#define GROUP_SHIFT(duration) \
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_MAX(0, 16 - __builtin_clz(duration))
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/* MCS rate information for an MCS group */
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#define __MCS_GROUP(_streams, _sgi, _ht40, _s) \
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[GROUP_IDX(_streams, _sgi, _ht40)] = { \
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.streams = _streams, \
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.shift = _s, \
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.bw = _ht40, \
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.flags = \
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IEEE80211_TX_RC_MCS | \
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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) >> _s, \
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MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52) >> _s, \
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MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78) >> _s, \
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MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104) >> _s, \
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MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156) >> _s, \
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MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208) >> _s, \
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MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234) >> _s, \
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MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) >> _s \
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} \
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}
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#define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \
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GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26))
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#define MCS_GROUP(_streams, _sgi, _ht40) \
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__MCS_GROUP(_streams, _sgi, _ht40, \
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MCS_GROUP_SHIFT(_streams, _sgi, _ht40))
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#define VHT_GROUP_IDX(_streams, _sgi, _bw) \
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(MINSTREL_VHT_GROUP_0 + \
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MINSTREL_MAX_STREAMS * 2 * (_bw) + \
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MINSTREL_MAX_STREAMS * (_sgi) + \
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(_streams) - 1)
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#define BW2VBPS(_bw, r3, r2, r1) \
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(_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1)
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#define __VHT_GROUP(_streams, _sgi, _bw, _s) \
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[VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \
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.streams = _streams, \
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.shift = _s, \
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.bw = _bw, \
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.flags = \
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IEEE80211_TX_RC_VHT_MCS | \
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(_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
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(_bw == BW_80 ? IEEE80211_TX_RC_80_MHZ_WIDTH : \
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_bw == BW_40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \
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.duration = { \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 117, 54, 26)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 234, 108, 52)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 351, 162, 78)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 468, 216, 104)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 702, 324, 156)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 936, 432, 208)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 1053, 486, 234)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 1170, 540, 260)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 1404, 648, 312)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 1560, 720, 346)) >> _s \
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} \
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}
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#define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \
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GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 117, 54, 26)))
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#define VHT_GROUP(_streams, _sgi, _bw) \
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__VHT_GROUP(_streams, _sgi, _bw, \
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VHT_GROUP_SHIFT(_streams, _sgi, _bw))
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#define CCK_DURATION(_bitrate, _short) \
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(1000 * (10 /* SIFS */ + \
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(_short ? 72 + 24 : 144 + 48) + \
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(8 * (AVG_PKT_SIZE + 4) * 10) / (_bitrate)))
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#define CCK_DURATION_LIST(_short, _s) \
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CCK_DURATION(10, _short) >> _s, \
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CCK_DURATION(20, _short) >> _s, \
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CCK_DURATION(55, _short) >> _s, \
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CCK_DURATION(110, _short) >> _s
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#define __CCK_GROUP(_s) \
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[MINSTREL_CCK_GROUP] = { \
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.streams = 1, \
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.flags = 0, \
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.shift = _s, \
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.duration = { \
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CCK_DURATION_LIST(false, _s), \
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CCK_DURATION_LIST(true, _s) \
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} \
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}
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#define CCK_GROUP_SHIFT \
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GROUP_SHIFT(CCK_DURATION(10, false))
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#define CCK_GROUP __CCK_GROUP(CCK_GROUP_SHIFT)
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#define OFDM_DURATION(_bitrate) \
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(1000 * (16 /* SIFS + signal ext */ + \
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16 /* T_PREAMBLE */ + \
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4 /* T_SIGNAL */ + \
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4 * (((16 + 80 * (AVG_PKT_SIZE + 4) + 6) / \
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((_bitrate) * 4)))))
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#define OFDM_DURATION_LIST(_s) \
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OFDM_DURATION(60) >> _s, \
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OFDM_DURATION(90) >> _s, \
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OFDM_DURATION(120) >> _s, \
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OFDM_DURATION(180) >> _s, \
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OFDM_DURATION(240) >> _s, \
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OFDM_DURATION(360) >> _s, \
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OFDM_DURATION(480) >> _s, \
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OFDM_DURATION(540) >> _s
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#define __OFDM_GROUP(_s) \
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[MINSTREL_OFDM_GROUP] = { \
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.streams = 1, \
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.flags = 0, \
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.shift = _s, \
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.duration = { \
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OFDM_DURATION_LIST(_s), \
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} \
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}
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#define OFDM_GROUP_SHIFT \
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GROUP_SHIFT(OFDM_DURATION(60))
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#define OFDM_GROUP __OFDM_GROUP(OFDM_GROUP_SHIFT)
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static bool minstrel_vht_only = true;
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module_param(minstrel_vht_only, bool, 0644);
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MODULE_PARM_DESC(minstrel_vht_only,
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"Use only VHT rates when VHT is supported by sta.");
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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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* Sortorder has to be fixed for GROUP_IDX macro to be applicable:
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* BW -> SGI -> #streams
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*/
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const struct mcs_group minstrel_mcs_groups[] = {
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MCS_GROUP(1, 0, BW_20),
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MCS_GROUP(2, 0, BW_20),
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MCS_GROUP(3, 0, BW_20),
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MCS_GROUP(4, 0, BW_20),
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MCS_GROUP(1, 1, BW_20),
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MCS_GROUP(2, 1, BW_20),
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MCS_GROUP(3, 1, BW_20),
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MCS_GROUP(4, 1, BW_20),
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MCS_GROUP(1, 0, BW_40),
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MCS_GROUP(2, 0, BW_40),
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MCS_GROUP(3, 0, BW_40),
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MCS_GROUP(4, 0, BW_40),
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MCS_GROUP(1, 1, BW_40),
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MCS_GROUP(2, 1, BW_40),
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MCS_GROUP(3, 1, BW_40),
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MCS_GROUP(4, 1, BW_40),
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CCK_GROUP,
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OFDM_GROUP,
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VHT_GROUP(1, 0, BW_20),
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VHT_GROUP(2, 0, BW_20),
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VHT_GROUP(3, 0, BW_20),
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VHT_GROUP(4, 0, BW_20),
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VHT_GROUP(1, 1, BW_20),
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VHT_GROUP(2, 1, BW_20),
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VHT_GROUP(3, 1, BW_20),
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VHT_GROUP(4, 1, BW_20),
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VHT_GROUP(1, 0, BW_40),
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VHT_GROUP(2, 0, BW_40),
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VHT_GROUP(3, 0, BW_40),
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VHT_GROUP(4, 0, BW_40),
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VHT_GROUP(1, 1, BW_40),
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VHT_GROUP(2, 1, BW_40),
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VHT_GROUP(3, 1, BW_40),
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VHT_GROUP(4, 1, BW_40),
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VHT_GROUP(1, 0, BW_80),
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VHT_GROUP(2, 0, BW_80),
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VHT_GROUP(3, 0, BW_80),
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VHT_GROUP(4, 0, BW_80),
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VHT_GROUP(1, 1, BW_80),
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VHT_GROUP(2, 1, BW_80),
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VHT_GROUP(3, 1, BW_80),
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VHT_GROUP(4, 1, BW_80),
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};
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const s16 minstrel_cck_bitrates[4] = { 10, 20, 55, 110 };
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const s16 minstrel_ofdm_bitrates[8] = { 60, 90, 120, 180, 240, 360, 480, 540 };
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static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly;
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static const u8 minstrel_sample_seq[] = {
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MINSTREL_SAMPLE_TYPE_INC,
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MINSTREL_SAMPLE_TYPE_JUMP,
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MINSTREL_SAMPLE_TYPE_INC,
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MINSTREL_SAMPLE_TYPE_JUMP,
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MINSTREL_SAMPLE_TYPE_INC,
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MINSTREL_SAMPLE_TYPE_SLOW,
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};
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static void
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minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi);
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/*
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* Some VHT MCSes are invalid (when Ndbps / Nes is not an integer)
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* e.g for MCS9@20MHzx1Nss: Ndbps=8x52*(5/6) Nes=1
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*
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* Returns the valid mcs map for struct minstrel_mcs_group_data.supported
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*/
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static u16
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minstrel_get_valid_vht_rates(int bw, int nss, __le16 mcs_map)
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{
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u16 mask = 0;
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if (bw == BW_20) {
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if (nss != 3 && nss != 6)
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mask = BIT(9);
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} else if (bw == BW_80) {
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if (nss == 3 || nss == 7)
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mask = BIT(6);
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else if (nss == 6)
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mask = BIT(9);
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} else {
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WARN_ON(bw != BW_40);
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}
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switch ((le16_to_cpu(mcs_map) >> (2 * (nss - 1))) & 3) {
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case IEEE80211_VHT_MCS_SUPPORT_0_7:
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mask |= 0x300;
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break;
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case IEEE80211_VHT_MCS_SUPPORT_0_8:
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mask |= 0x200;
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break;
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case IEEE80211_VHT_MCS_SUPPORT_0_9:
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break;
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default:
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mask = 0x3ff;
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}
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return 0x3ff & ~mask;
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}
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static bool
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minstrel_ht_is_legacy_group(int group)
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{
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return group == MINSTREL_CCK_GROUP ||
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group == MINSTREL_OFDM_GROUP;
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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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return GROUP_IDX((rate->idx / 8) + 1,
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!!(rate->flags & IEEE80211_TX_RC_SHORT_GI),
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!!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH));
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}
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static int
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minstrel_vht_get_group_idx(struct ieee80211_tx_rate *rate)
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{
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return VHT_GROUP_IDX(ieee80211_rate_get_vht_nss(rate),
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!!(rate->flags & IEEE80211_TX_RC_SHORT_GI),
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!!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) +
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2*!!(rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH));
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}
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static struct minstrel_rate_stats *
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minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
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struct ieee80211_tx_rate *rate)
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{
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int group, idx;
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if (rate->flags & IEEE80211_TX_RC_MCS) {
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group = minstrel_ht_get_group_idx(rate);
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idx = rate->idx % 8;
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goto out;
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}
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if (rate->flags & IEEE80211_TX_RC_VHT_MCS) {
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group = minstrel_vht_get_group_idx(rate);
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idx = ieee80211_rate_get_vht_mcs(rate);
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goto out;
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}
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group = MINSTREL_CCK_GROUP;
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for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) {
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if (rate->idx != mp->cck_rates[idx])
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continue;
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/* short preamble */
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if ((mi->supported[group] & BIT(idx + 4)) &&
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(rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE))
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idx += 4;
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goto out;
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}
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group = MINSTREL_OFDM_GROUP;
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for (idx = 0; idx < ARRAY_SIZE(mp->ofdm_rates[0]); idx++)
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if (rate->idx == mp->ofdm_rates[mi->band][idx])
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goto out;
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idx = 0;
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out:
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return &mi->groups[group].rates[idx];
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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[MI_RATE_GROUP(index)].rates[MI_RATE_IDX(index)];
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}
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static inline int minstrel_get_duration(int index)
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{
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const struct mcs_group *group = &minstrel_mcs_groups[MI_RATE_GROUP(index)];
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unsigned int duration = group->duration[MI_RATE_IDX(index)];
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return duration << group->shift;
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}
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static unsigned int
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minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi)
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{
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int duration;
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if (mi->avg_ampdu_len)
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return MINSTREL_TRUNC(mi->avg_ampdu_len);
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if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(mi->max_tp_rate[0])))
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return 1;
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duration = minstrel_get_duration(mi->max_tp_rate[0]);
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if (duration > 400 * 1000)
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return 2;
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if (duration > 250 * 1000)
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return 4;
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if (duration > 150 * 1000)
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return 8;
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return 16;
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}
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/*
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* Return current throughput based on the average A-MPDU length, taking into
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* account the expected number of retransmissions and their expected length
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*/
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int
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minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
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int prob_avg)
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{
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unsigned int nsecs = 0, overhead = mi->overhead;
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unsigned int ampdu_len = 1;
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/* do not account throughput if sucess prob is below 10% */
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if (prob_avg < MINSTREL_FRAC(10, 100))
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return 0;
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if (minstrel_ht_is_legacy_group(group))
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overhead = mi->overhead_legacy;
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else
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ampdu_len = minstrel_ht_avg_ampdu_len(mi);
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nsecs = 1000 * overhead / ampdu_len;
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nsecs += minstrel_mcs_groups[group].duration[rate] <<
|
|
minstrel_mcs_groups[group].shift;
|
|
|
|
/*
|
|
* For the throughput calculation, limit the probability value to 90% to
|
|
* account for collision related packet error rate fluctuation
|
|
* (prob is scaled - see MINSTREL_FRAC above)
|
|
*/
|
|
if (prob_avg > MINSTREL_FRAC(90, 100))
|
|
prob_avg = MINSTREL_FRAC(90, 100);
|
|
|
|
return MINSTREL_TRUNC(100 * ((prob_avg * 1000000) / nsecs));
|
|
}
|
|
|
|
/*
|
|
* Find & sort topmost throughput rates
|
|
*
|
|
* If multiple rates provide equal throughput the sorting is based on their
|
|
* current success probability. Higher success probability is preferred among
|
|
* MCS groups, CCK rates do not provide aggregation and are therefore at last.
|
|
*/
|
|
static void
|
|
minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u16 index,
|
|
u16 *tp_list)
|
|
{
|
|
int cur_group, cur_idx, cur_tp_avg, cur_prob;
|
|
int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob;
|
|
int j = MAX_THR_RATES;
|
|
|
|
cur_group = MI_RATE_GROUP(index);
|
|
cur_idx = MI_RATE_IDX(index);
|
|
cur_prob = mi->groups[cur_group].rates[cur_idx].prob_avg;
|
|
cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, cur_prob);
|
|
|
|
do {
|
|
tmp_group = MI_RATE_GROUP(tp_list[j - 1]);
|
|
tmp_idx = MI_RATE_IDX(tp_list[j - 1]);
|
|
tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg;
|
|
tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx,
|
|
tmp_prob);
|
|
if (cur_tp_avg < tmp_tp_avg ||
|
|
(cur_tp_avg == tmp_tp_avg && cur_prob <= tmp_prob))
|
|
break;
|
|
j--;
|
|
} while (j > 0);
|
|
|
|
if (j < MAX_THR_RATES - 1) {
|
|
memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) *
|
|
(MAX_THR_RATES - (j + 1))));
|
|
}
|
|
if (j < MAX_THR_RATES)
|
|
tp_list[j] = index;
|
|
}
|
|
|
|
/*
|
|
* Find and set the topmost probability rate per sta and per group
|
|
*/
|
|
static void
|
|
minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 *dest, u16 index)
|
|
{
|
|
struct minstrel_mcs_group_data *mg;
|
|
struct minstrel_rate_stats *mrs;
|
|
int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob;
|
|
int max_tp_group, max_tp_idx, max_tp_prob;
|
|
int cur_tp_avg, cur_group, cur_idx;
|
|
int max_gpr_group, max_gpr_idx;
|
|
int max_gpr_tp_avg, max_gpr_prob;
|
|
|
|
cur_group = MI_RATE_GROUP(index);
|
|
cur_idx = MI_RATE_IDX(index);
|
|
mg = &mi->groups[cur_group];
|
|
mrs = &mg->rates[cur_idx];
|
|
|
|
tmp_group = MI_RATE_GROUP(*dest);
|
|
tmp_idx = MI_RATE_IDX(*dest);
|
|
tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg;
|
|
tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob);
|
|
|
|
/* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from
|
|
* MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */
|
|
max_tp_group = MI_RATE_GROUP(mi->max_tp_rate[0]);
|
|
max_tp_idx = MI_RATE_IDX(mi->max_tp_rate[0]);
|
|
max_tp_prob = mi->groups[max_tp_group].rates[max_tp_idx].prob_avg;
|
|
|
|
if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(index)) &&
|
|
!minstrel_ht_is_legacy_group(max_tp_group))
|
|
return;
|
|
|
|
/* skip rates faster than max tp rate with lower prob */
|
|
if (minstrel_get_duration(mi->max_tp_rate[0]) > minstrel_get_duration(index) &&
|
|
mrs->prob_avg < max_tp_prob)
|
|
return;
|
|
|
|
max_gpr_group = MI_RATE_GROUP(mg->max_group_prob_rate);
|
|
max_gpr_idx = MI_RATE_IDX(mg->max_group_prob_rate);
|
|
max_gpr_prob = mi->groups[max_gpr_group].rates[max_gpr_idx].prob_avg;
|
|
|
|
if (mrs->prob_avg > MINSTREL_FRAC(75, 100)) {
|
|
cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx,
|
|
mrs->prob_avg);
|
|
if (cur_tp_avg > tmp_tp_avg)
|
|
*dest = index;
|
|
|
|
max_gpr_tp_avg = minstrel_ht_get_tp_avg(mi, max_gpr_group,
|
|
max_gpr_idx,
|
|
max_gpr_prob);
|
|
if (cur_tp_avg > max_gpr_tp_avg)
|
|
mg->max_group_prob_rate = index;
|
|
} else {
|
|
if (mrs->prob_avg > tmp_prob)
|
|
*dest = index;
|
|
if (mrs->prob_avg > max_gpr_prob)
|
|
mg->max_group_prob_rate = index;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Assign new rate set per sta and use CCK rates only if the fastest
|
|
* rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted
|
|
* rate sets where MCS and CCK rates are mixed, because CCK rates can
|
|
* not use aggregation.
|
|
*/
|
|
static void
|
|
minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi,
|
|
u16 tmp_mcs_tp_rate[MAX_THR_RATES],
|
|
u16 tmp_legacy_tp_rate[MAX_THR_RATES])
|
|
{
|
|
unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp, tmp_prob;
|
|
int i;
|
|
|
|
tmp_group = MI_RATE_GROUP(tmp_legacy_tp_rate[0]);
|
|
tmp_idx = MI_RATE_IDX(tmp_legacy_tp_rate[0]);
|
|
tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg;
|
|
tmp_cck_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob);
|
|
|
|
tmp_group = MI_RATE_GROUP(tmp_mcs_tp_rate[0]);
|
|
tmp_idx = MI_RATE_IDX(tmp_mcs_tp_rate[0]);
|
|
tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_avg;
|
|
tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob);
|
|
|
|
if (tmp_cck_tp > tmp_mcs_tp) {
|
|
for(i = 0; i < MAX_THR_RATES; i++) {
|
|
minstrel_ht_sort_best_tp_rates(mi, tmp_legacy_tp_rate[i],
|
|
tmp_mcs_tp_rate);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Try to increase robustness of max_prob rate by decrease number of
|
|
* streams if possible.
|
|
*/
|
|
static inline void
|
|
minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi)
|
|
{
|
|
struct minstrel_mcs_group_data *mg;
|
|
int tmp_max_streams, group, tmp_idx, tmp_prob;
|
|
int tmp_tp = 0;
|
|
|
|
if (!mi->sta->ht_cap.ht_supported)
|
|
return;
|
|
|
|
group = MI_RATE_GROUP(mi->max_tp_rate[0]);
|
|
tmp_max_streams = minstrel_mcs_groups[group].streams;
|
|
for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
|
|
mg = &mi->groups[group];
|
|
if (!mi->supported[group] || group == MINSTREL_CCK_GROUP)
|
|
continue;
|
|
|
|
tmp_idx = MI_RATE_IDX(mg->max_group_prob_rate);
|
|
tmp_prob = mi->groups[group].rates[tmp_idx].prob_avg;
|
|
|
|
if (tmp_tp < minstrel_ht_get_tp_avg(mi, group, tmp_idx, tmp_prob) &&
|
|
(minstrel_mcs_groups[group].streams < tmp_max_streams)) {
|
|
mi->max_prob_rate = mg->max_group_prob_rate;
|
|
tmp_tp = minstrel_ht_get_tp_avg(mi, group,
|
|
tmp_idx,
|
|
tmp_prob);
|
|
}
|
|
}
|
|
}
|
|
|
|
static u16
|
|
__minstrel_ht_get_sample_rate(struct minstrel_ht_sta *mi,
|
|
enum minstrel_sample_type type)
|
|
{
|
|
u16 *rates = mi->sample[type].sample_rates;
|
|
u16 cur;
|
|
int i;
|
|
|
|
for (i = 0; i < MINSTREL_SAMPLE_RATES; i++) {
|
|
if (!rates[i])
|
|
continue;
|
|
|
|
cur = rates[i];
|
|
rates[i] = 0;
|
|
return cur;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline int minstrel_filter_avg_add(u16 *prev_1, u16 *prev_2, s32 in)
|
|
{
|
|
s32 out_1 = *prev_1;
|
|
s32 out_2 = *prev_2;
|
|
s32 val;
|
|
|
|
if (!in)
|
|
in += 1;
|
|
|
|
if (!out_1) {
|
|
val = out_1 = in;
|
|
goto out;
|
|
}
|
|
|
|
val = MINSTREL_AVG_COEFF1 * in;
|
|
val += MINSTREL_AVG_COEFF2 * out_1;
|
|
val += MINSTREL_AVG_COEFF3 * out_2;
|
|
val >>= MINSTREL_SCALE;
|
|
|
|
if (val > 1 << MINSTREL_SCALE)
|
|
val = 1 << MINSTREL_SCALE;
|
|
if (val < 0)
|
|
val = 1;
|
|
|
|
out:
|
|
*prev_2 = out_1;
|
|
*prev_1 = val;
|
|
|
|
return val;
|
|
}
|
|
|
|
/*
|
|
* Recalculate statistics and counters of a given rate
|
|
*/
|
|
static void
|
|
minstrel_ht_calc_rate_stats(struct minstrel_priv *mp,
|
|
struct minstrel_rate_stats *mrs)
|
|
{
|
|
unsigned int cur_prob;
|
|
|
|
if (unlikely(mrs->attempts > 0)) {
|
|
cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts);
|
|
minstrel_filter_avg_add(&mrs->prob_avg,
|
|
&mrs->prob_avg_1, cur_prob);
|
|
mrs->att_hist += mrs->attempts;
|
|
mrs->succ_hist += mrs->success;
|
|
}
|
|
|
|
mrs->last_success = mrs->success;
|
|
mrs->last_attempts = mrs->attempts;
|
|
mrs->success = 0;
|
|
mrs->attempts = 0;
|
|
}
|
|
|
|
static bool
|
|
minstrel_ht_find_sample_rate(struct minstrel_ht_sta *mi, int type, int idx)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < MINSTREL_SAMPLE_RATES; i++) {
|
|
u16 cur = mi->sample[type].sample_rates[i];
|
|
|
|
if (cur == idx)
|
|
return true;
|
|
|
|
if (!cur)
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int
|
|
minstrel_ht_move_sample_rates(struct minstrel_ht_sta *mi, int type,
|
|
u32 fast_rate_dur, u32 slow_rate_dur)
|
|
{
|
|
u16 *rates = mi->sample[type].sample_rates;
|
|
int i, j;
|
|
|
|
for (i = 0, j = 0; i < MINSTREL_SAMPLE_RATES; i++) {
|
|
u32 duration;
|
|
bool valid = false;
|
|
u16 cur;
|
|
|
|
cur = rates[i];
|
|
if (!cur)
|
|
continue;
|
|
|
|
duration = minstrel_get_duration(cur);
|
|
switch (type) {
|
|
case MINSTREL_SAMPLE_TYPE_SLOW:
|
|
valid = duration > fast_rate_dur &&
|
|
duration < slow_rate_dur;
|
|
break;
|
|
case MINSTREL_SAMPLE_TYPE_INC:
|
|
case MINSTREL_SAMPLE_TYPE_JUMP:
|
|
valid = duration < fast_rate_dur;
|
|
break;
|
|
default:
|
|
valid = false;
|
|
break;
|
|
}
|
|
|
|
if (!valid) {
|
|
rates[i] = 0;
|
|
continue;
|
|
}
|
|
|
|
if (i == j)
|
|
continue;
|
|
|
|
rates[j++] = cur;
|
|
rates[i] = 0;
|
|
}
|
|
|
|
return j;
|
|
}
|
|
|
|
static int
|
|
minstrel_ht_group_min_rate_offset(struct minstrel_ht_sta *mi, int group,
|
|
u32 max_duration)
|
|
{
|
|
u16 supported = mi->supported[group];
|
|
int i;
|
|
|
|
for (i = 0; i < MCS_GROUP_RATES && supported; i++, supported >>= 1) {
|
|
if (!(supported & BIT(0)))
|
|
continue;
|
|
|
|
if (minstrel_get_duration(MI_RATE(group, i)) >= max_duration)
|
|
continue;
|
|
|
|
return i;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Incremental update rates:
|
|
* Flip through groups and pick the first group rate that is faster than the
|
|
* highest currently selected rate
|
|
*/
|
|
static u16
|
|
minstrel_ht_next_inc_rate(struct minstrel_ht_sta *mi, u32 fast_rate_dur)
|
|
{
|
|
struct minstrel_mcs_group_data *mg;
|
|
u8 type = MINSTREL_SAMPLE_TYPE_INC;
|
|
int i, index = 0;
|
|
u8 group;
|
|
|
|
group = mi->sample[type].sample_group;
|
|
for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) {
|
|
group = (group + 1) % ARRAY_SIZE(minstrel_mcs_groups);
|
|
mg = &mi->groups[group];
|
|
|
|
index = minstrel_ht_group_min_rate_offset(mi, group,
|
|
fast_rate_dur);
|
|
if (index < 0)
|
|
continue;
|
|
|
|
index = MI_RATE(group, index & 0xf);
|
|
if (!minstrel_ht_find_sample_rate(mi, type, index))
|
|
goto out;
|
|
}
|
|
index = 0;
|
|
|
|
out:
|
|
mi->sample[type].sample_group = group;
|
|
|
|
return index;
|
|
}
|
|
|
|
static int
|
|
minstrel_ht_next_group_sample_rate(struct minstrel_ht_sta *mi, int group,
|
|
u16 supported, int offset)
|
|
{
|
|
struct minstrel_mcs_group_data *mg = &mi->groups[group];
|
|
u16 idx;
|
|
int i;
|
|
|
|
for (i = 0; i < MCS_GROUP_RATES; i++) {
|
|
idx = sample_table[mg->column][mg->index];
|
|
if (++mg->index >= MCS_GROUP_RATES) {
|
|
mg->index = 0;
|
|
if (++mg->column >= ARRAY_SIZE(sample_table))
|
|
mg->column = 0;
|
|
}
|
|
|
|
if (idx < offset)
|
|
continue;
|
|
|
|
if (!(supported & BIT(idx)))
|
|
continue;
|
|
|
|
return MI_RATE(group, idx);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Jump rates:
|
|
* Sample random rates, use those that are faster than the highest
|
|
* currently selected rate. Rates between the fastest and the slowest
|
|
* get sorted into the slow sample bucket, but only if it has room
|
|
*/
|
|
static u16
|
|
minstrel_ht_next_jump_rate(struct minstrel_ht_sta *mi, u32 fast_rate_dur,
|
|
u32 slow_rate_dur, int *slow_rate_ofs)
|
|
{
|
|
struct minstrel_mcs_group_data *mg;
|
|
struct minstrel_rate_stats *mrs;
|
|
u32 max_duration = slow_rate_dur;
|
|
int i, index, offset;
|
|
u16 *slow_rates;
|
|
u16 supported;
|
|
u32 duration;
|
|
u8 group;
|
|
|
|
if (*slow_rate_ofs >= MINSTREL_SAMPLE_RATES)
|
|
max_duration = fast_rate_dur;
|
|
|
|
slow_rates = mi->sample[MINSTREL_SAMPLE_TYPE_SLOW].sample_rates;
|
|
group = mi->sample[MINSTREL_SAMPLE_TYPE_JUMP].sample_group;
|
|
for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) {
|
|
u8 type;
|
|
|
|
group = (group + 1) % ARRAY_SIZE(minstrel_mcs_groups);
|
|
mg = &mi->groups[group];
|
|
|
|
supported = mi->supported[group];
|
|
if (!supported)
|
|
continue;
|
|
|
|
offset = minstrel_ht_group_min_rate_offset(mi, group,
|
|
max_duration);
|
|
if (offset < 0)
|
|
continue;
|
|
|
|
index = minstrel_ht_next_group_sample_rate(mi, group, supported,
|
|
offset);
|
|
if (index < 0)
|
|
continue;
|
|
|
|
duration = minstrel_get_duration(index);
|
|
if (duration < fast_rate_dur)
|
|
type = MINSTREL_SAMPLE_TYPE_JUMP;
|
|
else
|
|
type = MINSTREL_SAMPLE_TYPE_SLOW;
|
|
|
|
if (minstrel_ht_find_sample_rate(mi, type, index))
|
|
continue;
|
|
|
|
if (type == MINSTREL_SAMPLE_TYPE_JUMP)
|
|
goto found;
|
|
|
|
if (*slow_rate_ofs >= MINSTREL_SAMPLE_RATES)
|
|
continue;
|
|
|
|
if (duration >= slow_rate_dur)
|
|
continue;
|
|
|
|
/* skip slow rates with high success probability */
|
|
mrs = minstrel_get_ratestats(mi, index);
|
|
if (mrs->prob_avg > MINSTREL_FRAC(95, 100))
|
|
continue;
|
|
|
|
slow_rates[(*slow_rate_ofs)++] = index;
|
|
if (*slow_rate_ofs >= MINSTREL_SAMPLE_RATES)
|
|
max_duration = fast_rate_dur;
|
|
}
|
|
index = 0;
|
|
|
|
found:
|
|
mi->sample[MINSTREL_SAMPLE_TYPE_JUMP].sample_group = group;
|
|
|
|
return index;
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_refill_sample_rates(struct minstrel_ht_sta *mi)
|
|
{
|
|
u32 prob_dur = minstrel_get_duration(mi->max_prob_rate);
|
|
u32 tp_dur = minstrel_get_duration(mi->max_tp_rate[0]);
|
|
u32 tp2_dur = minstrel_get_duration(mi->max_tp_rate[1]);
|
|
u32 fast_rate_dur = min(min(tp_dur, tp2_dur), prob_dur);
|
|
u32 slow_rate_dur = max(max(tp_dur, tp2_dur), prob_dur);
|
|
u16 *rates;
|
|
int i, j;
|
|
|
|
rates = mi->sample[MINSTREL_SAMPLE_TYPE_INC].sample_rates;
|
|
i = minstrel_ht_move_sample_rates(mi, MINSTREL_SAMPLE_TYPE_INC,
|
|
fast_rate_dur, slow_rate_dur);
|
|
while (i < MINSTREL_SAMPLE_RATES) {
|
|
rates[i] = minstrel_ht_next_inc_rate(mi, tp_dur);
|
|
if (!rates[i])
|
|
break;
|
|
|
|
i++;
|
|
}
|
|
|
|
rates = mi->sample[MINSTREL_SAMPLE_TYPE_JUMP].sample_rates;
|
|
i = minstrel_ht_move_sample_rates(mi, MINSTREL_SAMPLE_TYPE_JUMP,
|
|
fast_rate_dur, slow_rate_dur);
|
|
j = minstrel_ht_move_sample_rates(mi, MINSTREL_SAMPLE_TYPE_SLOW,
|
|
fast_rate_dur, slow_rate_dur);
|
|
while (i < MINSTREL_SAMPLE_RATES) {
|
|
rates[i] = minstrel_ht_next_jump_rate(mi, fast_rate_dur,
|
|
slow_rate_dur, &j);
|
|
if (!rates[i])
|
|
break;
|
|
|
|
i++;
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mi->sample); i++)
|
|
memcpy(mi->sample[i].cur_sample_rates, mi->sample[i].sample_rates,
|
|
sizeof(mi->sample[i].cur_sample_rates));
|
|
}
|
|
|
|
|
|
/*
|
|
* Update rate statistics and select new primary rates
|
|
*
|
|
* Rules for rate selection:
|
|
* - max_prob_rate must use only one stream, as a tradeoff between delivery
|
|
* probability and throughput during strong fluctuations
|
|
* - as long as the max prob rate has a probability of more than 75%, pick
|
|
* higher throughput rates, even if the probablity is a bit lower
|
|
*/
|
|
static void
|
|
minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
|
|
{
|
|
struct minstrel_mcs_group_data *mg;
|
|
struct minstrel_rate_stats *mrs;
|
|
int group, i, j, cur_prob;
|
|
u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES];
|
|
u16 tmp_legacy_tp_rate[MAX_THR_RATES], tmp_max_prob_rate;
|
|
u16 index;
|
|
bool ht_supported = mi->sta->ht_cap.ht_supported;
|
|
|
|
if (mi->ampdu_packets > 0) {
|
|
if (!ieee80211_hw_check(mp->hw, TX_STATUS_NO_AMPDU_LEN))
|
|
mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
|
|
MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets),
|
|
EWMA_LEVEL);
|
|
else
|
|
mi->avg_ampdu_len = 0;
|
|
mi->ampdu_len = 0;
|
|
mi->ampdu_packets = 0;
|
|
}
|
|
|
|
if (mi->supported[MINSTREL_CCK_GROUP])
|
|
group = MINSTREL_CCK_GROUP;
|
|
else if (mi->supported[MINSTREL_OFDM_GROUP])
|
|
group = MINSTREL_OFDM_GROUP;
|
|
else
|
|
group = 0;
|
|
|
|
index = MI_RATE(group, 0);
|
|
for (j = 0; j < ARRAY_SIZE(tmp_legacy_tp_rate); j++)
|
|
tmp_legacy_tp_rate[j] = index;
|
|
|
|
if (mi->supported[MINSTREL_VHT_GROUP_0])
|
|
group = MINSTREL_VHT_GROUP_0;
|
|
else if (ht_supported)
|
|
group = MINSTREL_HT_GROUP_0;
|
|
else if (mi->supported[MINSTREL_CCK_GROUP])
|
|
group = MINSTREL_CCK_GROUP;
|
|
else
|
|
group = MINSTREL_OFDM_GROUP;
|
|
|
|
index = MI_RATE(group, 0);
|
|
tmp_max_prob_rate = index;
|
|
for (j = 0; j < ARRAY_SIZE(tmp_mcs_tp_rate); j++)
|
|
tmp_mcs_tp_rate[j] = index;
|
|
|
|
/* Find best rate sets within all MCS groups*/
|
|
for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
|
|
u16 *tp_rate = tmp_mcs_tp_rate;
|
|
u16 last_prob = 0;
|
|
|
|
mg = &mi->groups[group];
|
|
if (!mi->supported[group])
|
|
continue;
|
|
|
|
/* (re)Initialize group rate indexes */
|
|
for(j = 0; j < MAX_THR_RATES; j++)
|
|
tmp_group_tp_rate[j] = MI_RATE(group, 0);
|
|
|
|
if (group == MINSTREL_CCK_GROUP && ht_supported)
|
|
tp_rate = tmp_legacy_tp_rate;
|
|
|
|
for (i = MCS_GROUP_RATES - 1; i >= 0; i--) {
|
|
if (!(mi->supported[group] & BIT(i)))
|
|
continue;
|
|
|
|
index = MI_RATE(group, i);
|
|
|
|
mrs = &mg->rates[i];
|
|
mrs->retry_updated = false;
|
|
minstrel_ht_calc_rate_stats(mp, mrs);
|
|
|
|
if (mrs->att_hist)
|
|
last_prob = max(last_prob, mrs->prob_avg);
|
|
else
|
|
mrs->prob_avg = max(last_prob, mrs->prob_avg);
|
|
cur_prob = mrs->prob_avg;
|
|
|
|
if (minstrel_ht_get_tp_avg(mi, group, i, cur_prob) == 0)
|
|
continue;
|
|
|
|
/* Find max throughput rate set */
|
|
minstrel_ht_sort_best_tp_rates(mi, index, tp_rate);
|
|
|
|
/* Find max throughput rate set within a group */
|
|
minstrel_ht_sort_best_tp_rates(mi, index,
|
|
tmp_group_tp_rate);
|
|
}
|
|
|
|
memcpy(mg->max_group_tp_rate, tmp_group_tp_rate,
|
|
sizeof(mg->max_group_tp_rate));
|
|
}
|
|
|
|
/* Assign new rate set per sta */
|
|
minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate,
|
|
tmp_legacy_tp_rate);
|
|
memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate));
|
|
|
|
for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
|
|
if (!mi->supported[group])
|
|
continue;
|
|
|
|
mg = &mi->groups[group];
|
|
mg->max_group_prob_rate = MI_RATE(group, 0);
|
|
|
|
for (i = 0; i < MCS_GROUP_RATES; i++) {
|
|
if (!(mi->supported[group] & BIT(i)))
|
|
continue;
|
|
|
|
index = MI_RATE(group, i);
|
|
|
|
/* Find max probability rate per group and global */
|
|
minstrel_ht_set_best_prob_rate(mi, &tmp_max_prob_rate,
|
|
index);
|
|
}
|
|
}
|
|
|
|
mi->max_prob_rate = tmp_max_prob_rate;
|
|
|
|
/* Try to increase robustness of max_prob_rate*/
|
|
minstrel_ht_prob_rate_reduce_streams(mi);
|
|
minstrel_ht_refill_sample_rates(mi);
|
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
/* use fixed index if set */
|
|
if (mp->fixed_rate_idx != -1) {
|
|
for (i = 0; i < 4; i++)
|
|
mi->max_tp_rate[i] = mp->fixed_rate_idx;
|
|
mi->max_prob_rate = mp->fixed_rate_idx;
|
|
}
|
|
#endif
|
|
|
|
/* Reset update timer */
|
|
mi->last_stats_update = jiffies;
|
|
mi->sample_time = jiffies;
|
|
}
|
|
|
|
static bool
|
|
minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
|
|
struct ieee80211_tx_rate *rate)
|
|
{
|
|
int i;
|
|
|
|
if (rate->idx < 0)
|
|
return false;
|
|
|
|
if (!rate->count)
|
|
return false;
|
|
|
|
if (rate->flags & IEEE80211_TX_RC_MCS ||
|
|
rate->flags & IEEE80211_TX_RC_VHT_MCS)
|
|
return true;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mp->cck_rates); i++)
|
|
if (rate->idx == mp->cck_rates[i])
|
|
return true;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mp->ofdm_rates[0]); i++)
|
|
if (rate->idx == mp->ofdm_rates[mi->band][i])
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static void
|
|
minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u16 *idx, bool primary)
|
|
{
|
|
int group, orig_group;
|
|
|
|
orig_group = group = MI_RATE_GROUP(*idx);
|
|
while (group > 0) {
|
|
group--;
|
|
|
|
if (!mi->supported[group])
|
|
continue;
|
|
|
|
if (minstrel_mcs_groups[group].streams >
|
|
minstrel_mcs_groups[orig_group].streams)
|
|
continue;
|
|
|
|
if (primary)
|
|
*idx = mi->groups[group].max_group_tp_rate[0];
|
|
else
|
|
*idx = mi->groups[group].max_group_tp_rate[1];
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
u16 tid;
|
|
|
|
if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO)
|
|
return;
|
|
|
|
if (unlikely(!ieee80211_is_data_qos(hdr->frame_control)))
|
|
return;
|
|
|
|
if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE)))
|
|
return;
|
|
|
|
tid = ieee80211_get_tid(hdr);
|
|
if (likely(sta->ampdu_mlme.tid_tx[tid]))
|
|
return;
|
|
|
|
ieee80211_start_tx_ba_session(pubsta, tid, 0);
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
|
|
void *priv_sta, struct ieee80211_tx_status *st)
|
|
{
|
|
struct ieee80211_tx_info *info = st->info;
|
|
struct minstrel_ht_sta *mi = priv_sta;
|
|
struct ieee80211_tx_rate *ar = info->status.rates;
|
|
struct minstrel_rate_stats *rate, *rate2;
|
|
struct minstrel_priv *mp = priv;
|
|
u32 update_interval = mp->update_interval;
|
|
bool last, update = false;
|
|
int i;
|
|
|
|
/* 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->flags & IEEE80211_TX_STAT_AMPDU)) {
|
|
info->status.ampdu_ack_len =
|
|
(info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0);
|
|
info->status.ampdu_len = 1;
|
|
}
|
|
|
|
/* wraparound */
|
|
if (mi->total_packets >= ~0 - info->status.ampdu_len) {
|
|
mi->total_packets = 0;
|
|
mi->sample_packets = 0;
|
|
}
|
|
|
|
mi->total_packets += info->status.ampdu_len;
|
|
if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
|
|
mi->sample_packets += info->status.ampdu_len;
|
|
|
|
mi->ampdu_packets++;
|
|
mi->ampdu_len += info->status.ampdu_len;
|
|
|
|
last = !minstrel_ht_txstat_valid(mp, mi, &ar[0]);
|
|
for (i = 0; !last; i++) {
|
|
last = (i == IEEE80211_TX_MAX_RATES - 1) ||
|
|
!minstrel_ht_txstat_valid(mp, mi, &ar[i + 1]);
|
|
|
|
rate = minstrel_ht_get_stats(mp, mi, &ar[i]);
|
|
if (last)
|
|
rate->success += info->status.ampdu_ack_len;
|
|
|
|
rate->attempts += ar[i].count * info->status.ampdu_len;
|
|
}
|
|
|
|
if (mp->hw->max_rates > 1) {
|
|
/*
|
|
* 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[0]);
|
|
if (rate->attempts > 30 &&
|
|
rate->success < rate->attempts / 4) {
|
|
minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true);
|
|
update = true;
|
|
}
|
|
|
|
rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]);
|
|
if (rate2->attempts > 30 &&
|
|
rate2->success < rate2->attempts / 4) {
|
|
minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false);
|
|
update = true;
|
|
}
|
|
}
|
|
|
|
if (time_after(jiffies, mi->last_stats_update + update_interval)) {
|
|
update = true;
|
|
minstrel_ht_update_stats(mp, mi);
|
|
}
|
|
|
|
if (update)
|
|
minstrel_ht_update_rates(mp, mi);
|
|
}
|
|
|
|
static void
|
|
minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
|
|
int index)
|
|
{
|
|
struct minstrel_rate_stats *mrs;
|
|
unsigned int tx_time, tx_time_rtscts, tx_time_data;
|
|
unsigned int cw = mp->cw_min;
|
|
unsigned int ctime = 0;
|
|
unsigned int t_slot = 9; /* FIXME */
|
|
unsigned int ampdu_len = minstrel_ht_avg_ampdu_len(mi);
|
|
unsigned int overhead = 0, overhead_rtscts = 0;
|
|
|
|
mrs = minstrel_get_ratestats(mi, index);
|
|
if (mrs->prob_avg < MINSTREL_FRAC(1, 10)) {
|
|
mrs->retry_count = 1;
|
|
mrs->retry_count_rtscts = 1;
|
|
return;
|
|
}
|
|
|
|
mrs->retry_count = 2;
|
|
mrs->retry_count_rtscts = 2;
|
|
mrs->retry_updated = true;
|
|
|
|
tx_time_data = minstrel_get_duration(index) * ampdu_len / 1000;
|
|
|
|
/* Contention time for first 2 tries */
|
|
ctime = (t_slot * cw) >> 1;
|
|
cw = min((cw << 1) | 1, mp->cw_max);
|
|
ctime += (t_slot * cw) >> 1;
|
|
cw = min((cw << 1) | 1, mp->cw_max);
|
|
|
|
if (minstrel_ht_is_legacy_group(MI_RATE_GROUP(index))) {
|
|
overhead = mi->overhead_legacy;
|
|
overhead_rtscts = mi->overhead_legacy_rtscts;
|
|
} else {
|
|
overhead = mi->overhead;
|
|
overhead_rtscts = mi->overhead_rtscts;
|
|
}
|
|
|
|
/* Total TX time for data and Contention after first 2 tries */
|
|
tx_time = ctime + 2 * (overhead + tx_time_data);
|
|
tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data);
|
|
|
|
/* See how many more tries we can fit inside segment size */
|
|
do {
|
|
/* Contention time for this try */
|
|
ctime = (t_slot * cw) >> 1;
|
|
cw = min((cw << 1) | 1, mp->cw_max);
|
|
|
|
/* Total TX time after this try */
|
|
tx_time += ctime + overhead + tx_time_data;
|
|
tx_time_rtscts += ctime + overhead_rtscts + tx_time_data;
|
|
|
|
if (tx_time_rtscts < mp->segment_size)
|
|
mrs->retry_count_rtscts++;
|
|
} while ((tx_time < mp->segment_size) &&
|
|
(++mrs->retry_count < mp->max_retry));
|
|
}
|
|
|
|
|
|
static void
|
|
minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
|
|
struct ieee80211_sta_rates *ratetbl, int offset, int index)
|
|
{
|
|
int group_idx = MI_RATE_GROUP(index);
|
|
const struct mcs_group *group = &minstrel_mcs_groups[group_idx];
|
|
struct minstrel_rate_stats *mrs;
|
|
u8 idx;
|
|
u16 flags = group->flags;
|
|
|
|
mrs = minstrel_get_ratestats(mi, index);
|
|
if (!mrs->retry_updated)
|
|
minstrel_calc_retransmit(mp, mi, index);
|
|
|
|
if (mrs->prob_avg < MINSTREL_FRAC(20, 100) || !mrs->retry_count) {
|
|
ratetbl->rate[offset].count = 2;
|
|
ratetbl->rate[offset].count_rts = 2;
|
|
ratetbl->rate[offset].count_cts = 2;
|
|
} else {
|
|
ratetbl->rate[offset].count = mrs->retry_count;
|
|
ratetbl->rate[offset].count_cts = mrs->retry_count;
|
|
ratetbl->rate[offset].count_rts = mrs->retry_count_rtscts;
|
|
}
|
|
|
|
index = MI_RATE_IDX(index);
|
|
if (group_idx == MINSTREL_CCK_GROUP)
|
|
idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)];
|
|
else if (group_idx == MINSTREL_OFDM_GROUP)
|
|
idx = mp->ofdm_rates[mi->band][index %
|
|
ARRAY_SIZE(mp->ofdm_rates[0])];
|
|
else if (flags & IEEE80211_TX_RC_VHT_MCS)
|
|
idx = ((group->streams - 1) << 4) |
|
|
(index & 0xF);
|
|
else
|
|
idx = index + (group->streams - 1) * 8;
|
|
|
|
/* enable RTS/CTS if needed:
|
|
* - if station is in dynamic SMPS (and streams > 1)
|
|
* - for fallback rates, to increase chances of getting through
|
|
*/
|
|
if (offset > 0 ||
|
|
(mi->sta->smps_mode == IEEE80211_SMPS_DYNAMIC &&
|
|
group->streams > 1)) {
|
|
ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts;
|
|
flags |= IEEE80211_TX_RC_USE_RTS_CTS;
|
|
}
|
|
|
|
ratetbl->rate[offset].idx = idx;
|
|
ratetbl->rate[offset].flags = flags;
|
|
}
|
|
|
|
static inline int
|
|
minstrel_ht_get_prob_avg(struct minstrel_ht_sta *mi, int rate)
|
|
{
|
|
int group = MI_RATE_GROUP(rate);
|
|
rate = MI_RATE_IDX(rate);
|
|
return mi->groups[group].rates[rate].prob_avg;
|
|
}
|
|
|
|
static int
|
|
minstrel_ht_get_max_amsdu_len(struct minstrel_ht_sta *mi)
|
|
{
|
|
int group = MI_RATE_GROUP(mi->max_prob_rate);
|
|
const struct mcs_group *g = &minstrel_mcs_groups[group];
|
|
int rate = MI_RATE_IDX(mi->max_prob_rate);
|
|
unsigned int duration;
|
|
|
|
/* Disable A-MSDU if max_prob_rate is bad */
|
|
if (mi->groups[group].rates[rate].prob_avg < MINSTREL_FRAC(50, 100))
|
|
return 1;
|
|
|
|
duration = g->duration[rate];
|
|
duration <<= g->shift;
|
|
|
|
/* If the rate is slower than single-stream MCS1, make A-MSDU limit small */
|
|
if (duration > MCS_DURATION(1, 0, 52))
|
|
return 500;
|
|
|
|
/*
|
|
* If the rate is slower than single-stream MCS4, limit A-MSDU to usual
|
|
* data packet size
|
|
*/
|
|
if (duration > MCS_DURATION(1, 0, 104))
|
|
return 1600;
|
|
|
|
/*
|
|
* If the rate is slower than single-stream MCS7, or if the max throughput
|
|
* rate success probability is less than 75%, limit A-MSDU to twice the usual
|
|
* data packet size
|
|
*/
|
|
if (duration > MCS_DURATION(1, 0, 260) ||
|
|
(minstrel_ht_get_prob_avg(mi, mi->max_tp_rate[0]) <
|
|
MINSTREL_FRAC(75, 100)))
|
|
return 3200;
|
|
|
|
/*
|
|
* HT A-MPDU limits maximum MPDU size under BA agreement to 4095 bytes.
|
|
* Since aggregation sessions are started/stopped without txq flush, use
|
|
* the limit here to avoid the complexity of having to de-aggregate
|
|
* packets in the queue.
|
|
*/
|
|
if (!mi->sta->vht_cap.vht_supported)
|
|
return IEEE80211_MAX_MPDU_LEN_HT_BA;
|
|
|
|
/* unlimited */
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
|
|
{
|
|
struct ieee80211_sta_rates *rates;
|
|
int i = 0;
|
|
|
|
rates = kzalloc(sizeof(*rates), GFP_ATOMIC);
|
|
if (!rates)
|
|
return;
|
|
|
|
/* Start with max_tp_rate[0] */
|
|
minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]);
|
|
|
|
if (mp->hw->max_rates >= 3) {
|
|
/* At least 3 tx rates supported, use max_tp_rate[1] next */
|
|
minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]);
|
|
}
|
|
|
|
if (mp->hw->max_rates >= 2) {
|
|
minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate);
|
|
}
|
|
|
|
mi->sta->max_rc_amsdu_len = minstrel_ht_get_max_amsdu_len(mi);
|
|
rates->rate[i].idx = -1;
|
|
rate_control_set_rates(mp->hw, mi->sta, rates);
|
|
}
|
|
|
|
static u16
|
|
minstrel_ht_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
|
|
{
|
|
u8 seq;
|
|
|
|
if (mp->hw->max_rates > 1) {
|
|
seq = mi->sample_seq;
|
|
mi->sample_seq = (seq + 1) % ARRAY_SIZE(minstrel_sample_seq);
|
|
seq = minstrel_sample_seq[seq];
|
|
} else {
|
|
seq = MINSTREL_SAMPLE_TYPE_INC;
|
|
}
|
|
|
|
return __minstrel_ht_get_sample_rate(mi, seq);
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
|
|
struct ieee80211_tx_rate_control *txrc)
|
|
{
|
|
const struct mcs_group *sample_group;
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
|
|
struct ieee80211_tx_rate *rate = &info->status.rates[0];
|
|
struct minstrel_ht_sta *mi = priv_sta;
|
|
struct minstrel_priv *mp = priv;
|
|
u16 sample_idx;
|
|
|
|
if (!(info->flags & IEEE80211_TX_CTL_AMPDU) &&
|
|
!minstrel_ht_is_legacy_group(MI_RATE_GROUP(mi->max_prob_rate)))
|
|
minstrel_aggr_check(sta, txrc->skb);
|
|
|
|
info->flags |= mi->tx_flags;
|
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
if (mp->fixed_rate_idx != -1)
|
|
return;
|
|
#endif
|
|
|
|
/* Don't use EAPOL frames for sampling on non-mrr hw */
|
|
if (mp->hw->max_rates == 1 &&
|
|
(info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO))
|
|
return;
|
|
|
|
if (time_is_before_jiffies(mi->sample_time))
|
|
return;
|
|
|
|
mi->sample_time = jiffies + MINSTREL_SAMPLE_INTERVAL;
|
|
sample_idx = minstrel_ht_get_sample_rate(mp, mi);
|
|
if (!sample_idx)
|
|
return;
|
|
|
|
sample_group = &minstrel_mcs_groups[MI_RATE_GROUP(sample_idx)];
|
|
sample_idx = MI_RATE_IDX(sample_idx);
|
|
|
|
if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP] &&
|
|
(sample_idx >= 4) != txrc->short_preamble)
|
|
return;
|
|
|
|
info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
|
|
rate->count = 1;
|
|
|
|
if (sample_group == &minstrel_mcs_groups[MINSTREL_CCK_GROUP]) {
|
|
int idx = sample_idx % ARRAY_SIZE(mp->cck_rates);
|
|
rate->idx = mp->cck_rates[idx];
|
|
} else if (sample_group == &minstrel_mcs_groups[MINSTREL_OFDM_GROUP]) {
|
|
int idx = sample_idx % ARRAY_SIZE(mp->ofdm_rates[0]);
|
|
rate->idx = mp->ofdm_rates[mi->band][idx];
|
|
} else if (sample_group->flags & IEEE80211_TX_RC_VHT_MCS) {
|
|
ieee80211_rate_set_vht(rate, MI_RATE_IDX(sample_idx),
|
|
sample_group->streams);
|
|
} else {
|
|
rate->idx = sample_idx + (sample_group->streams - 1) * 8;
|
|
}
|
|
|
|
rate->flags = sample_group->flags;
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
|
|
struct ieee80211_supported_band *sband,
|
|
struct ieee80211_sta *sta)
|
|
{
|
|
int i;
|
|
|
|
if (sband->band != NL80211_BAND_2GHZ)
|
|
return;
|
|
|
|
if (sta->ht_cap.ht_supported &&
|
|
!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES))
|
|
return;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
if (mp->cck_rates[i] == 0xff ||
|
|
!rate_supported(sta, sband->band, mp->cck_rates[i]))
|
|
continue;
|
|
|
|
mi->supported[MINSTREL_CCK_GROUP] |= BIT(i);
|
|
if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE)
|
|
mi->supported[MINSTREL_CCK_GROUP] |= BIT(i + 4);
|
|
}
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_update_ofdm(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
|
|
struct ieee80211_supported_band *sband,
|
|
struct ieee80211_sta *sta)
|
|
{
|
|
const u8 *rates;
|
|
int i;
|
|
|
|
if (sta->ht_cap.ht_supported)
|
|
return;
|
|
|
|
rates = mp->ofdm_rates[sband->band];
|
|
for (i = 0; i < ARRAY_SIZE(mp->ofdm_rates[0]); i++) {
|
|
if (rates[i] == 0xff ||
|
|
!rate_supported(sta, sband->band, rates[i]))
|
|
continue;
|
|
|
|
mi->supported[MINSTREL_OFDM_GROUP] |= BIT(i);
|
|
}
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
|
|
struct cfg80211_chan_def *chandef,
|
|
struct ieee80211_sta *sta, void *priv_sta)
|
|
{
|
|
struct minstrel_priv *mp = priv;
|
|
struct minstrel_ht_sta *mi = priv_sta;
|
|
struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
|
|
u16 ht_cap = sta->ht_cap.cap;
|
|
struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
|
|
const struct ieee80211_rate *ctl_rate;
|
|
bool ldpc, erp;
|
|
int use_vht;
|
|
int n_supported = 0;
|
|
int ack_dur;
|
|
int stbc;
|
|
int i;
|
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB);
|
|
|
|
if (vht_cap->vht_supported)
|
|
use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0);
|
|
else
|
|
use_vht = 0;
|
|
|
|
memset(mi, 0, sizeof(*mi));
|
|
|
|
mi->sta = sta;
|
|
mi->band = sband->band;
|
|
mi->last_stats_update = jiffies;
|
|
|
|
ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0);
|
|
mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0);
|
|
mi->overhead += ack_dur;
|
|
mi->overhead_rtscts = mi->overhead + 2 * ack_dur;
|
|
|
|
ctl_rate = &sband->bitrates[rate_lowest_index(sband, sta)];
|
|
erp = ctl_rate->flags & IEEE80211_RATE_ERP_G;
|
|
ack_dur = ieee80211_frame_duration(sband->band, 10,
|
|
ctl_rate->bitrate, erp, 1,
|
|
ieee80211_chandef_get_shift(chandef));
|
|
mi->overhead_legacy = ack_dur;
|
|
mi->overhead_legacy_rtscts = mi->overhead_legacy + 2 * ack_dur;
|
|
|
|
mi->avg_ampdu_len = MINSTREL_FRAC(1, 1);
|
|
|
|
if (!use_vht) {
|
|
stbc = (ht_cap & IEEE80211_HT_CAP_RX_STBC) >>
|
|
IEEE80211_HT_CAP_RX_STBC_SHIFT;
|
|
|
|
ldpc = ht_cap & IEEE80211_HT_CAP_LDPC_CODING;
|
|
} else {
|
|
stbc = (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK) >>
|
|
IEEE80211_VHT_CAP_RXSTBC_SHIFT;
|
|
|
|
ldpc = vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC;
|
|
}
|
|
|
|
mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT;
|
|
if (ldpc)
|
|
mi->tx_flags |= IEEE80211_TX_CTL_LDPC;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mi->groups); i++) {
|
|
u32 gflags = minstrel_mcs_groups[i].flags;
|
|
int bw, nss;
|
|
|
|
mi->supported[i] = 0;
|
|
if (minstrel_ht_is_legacy_group(i))
|
|
continue;
|
|
|
|
if (gflags & IEEE80211_TX_RC_SHORT_GI) {
|
|
if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
|
|
if (!(ht_cap & IEEE80211_HT_CAP_SGI_40))
|
|
continue;
|
|
} else {
|
|
if (!(ht_cap & IEEE80211_HT_CAP_SGI_20))
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH &&
|
|
sta->bandwidth < IEEE80211_STA_RX_BW_40)
|
|
continue;
|
|
|
|
nss = minstrel_mcs_groups[i].streams;
|
|
|
|
/* Mark MCS > 7 as unsupported if STA is in static SMPS mode */
|
|
if (sta->smps_mode == IEEE80211_SMPS_STATIC && nss > 1)
|
|
continue;
|
|
|
|
/* HT rate */
|
|
if (gflags & IEEE80211_TX_RC_MCS) {
|
|
if (use_vht && minstrel_vht_only)
|
|
continue;
|
|
|
|
mi->supported[i] = mcs->rx_mask[nss - 1];
|
|
if (mi->supported[i])
|
|
n_supported++;
|
|
continue;
|
|
}
|
|
|
|
/* VHT rate */
|
|
if (!vht_cap->vht_supported ||
|
|
WARN_ON(!(gflags & IEEE80211_TX_RC_VHT_MCS)) ||
|
|
WARN_ON(gflags & IEEE80211_TX_RC_160_MHZ_WIDTH))
|
|
continue;
|
|
|
|
if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) {
|
|
if (sta->bandwidth < IEEE80211_STA_RX_BW_80 ||
|
|
((gflags & IEEE80211_TX_RC_SHORT_GI) &&
|
|
!(vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80))) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
|
|
bw = BW_40;
|
|
else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
|
|
bw = BW_80;
|
|
else
|
|
bw = BW_20;
|
|
|
|
mi->supported[i] = minstrel_get_valid_vht_rates(bw, nss,
|
|
vht_cap->vht_mcs.tx_mcs_map);
|
|
|
|
if (mi->supported[i])
|
|
n_supported++;
|
|
}
|
|
|
|
minstrel_ht_update_cck(mp, mi, sband, sta);
|
|
minstrel_ht_update_ofdm(mp, mi, sband, sta);
|
|
|
|
/* create an initial rate table with the lowest supported rates */
|
|
minstrel_ht_update_stats(mp, mi);
|
|
minstrel_ht_update_rates(mp, mi);
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband,
|
|
struct cfg80211_chan_def *chandef,
|
|
struct ieee80211_sta *sta, void *priv_sta)
|
|
{
|
|
minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta);
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband,
|
|
struct cfg80211_chan_def *chandef,
|
|
struct ieee80211_sta *sta, void *priv_sta,
|
|
u32 changed)
|
|
{
|
|
minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta);
|
|
}
|
|
|
|
static void *
|
|
minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
|
|
{
|
|
struct ieee80211_supported_band *sband;
|
|
struct minstrel_ht_sta *mi;
|
|
struct minstrel_priv *mp = priv;
|
|
struct ieee80211_hw *hw = mp->hw;
|
|
int max_rates = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < NUM_NL80211_BANDS; i++) {
|
|
sband = hw->wiphy->bands[i];
|
|
if (sband && sband->n_bitrates > max_rates)
|
|
max_rates = sband->n_bitrates;
|
|
}
|
|
|
|
return kzalloc(sizeof(*mi), gfp);
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta)
|
|
{
|
|
kfree(priv_sta);
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_fill_rate_array(u8 *dest, struct ieee80211_supported_band *sband,
|
|
const s16 *bitrates, int n_rates, u32 rate_flags)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0; i < sband->n_bitrates; i++) {
|
|
struct ieee80211_rate *rate = &sband->bitrates[i];
|
|
|
|
if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
|
|
continue;
|
|
|
|
for (j = 0; j < n_rates; j++) {
|
|
if (rate->bitrate != bitrates[j])
|
|
continue;
|
|
|
|
dest[j] = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_init_cck_rates(struct minstrel_priv *mp)
|
|
{
|
|
static const s16 bitrates[4] = { 10, 20, 55, 110 };
|
|
struct ieee80211_supported_band *sband;
|
|
u32 rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef);
|
|
|
|
memset(mp->cck_rates, 0xff, sizeof(mp->cck_rates));
|
|
sband = mp->hw->wiphy->bands[NL80211_BAND_2GHZ];
|
|
if (!sband)
|
|
return;
|
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(mp->cck_rates) != ARRAY_SIZE(bitrates));
|
|
minstrel_ht_fill_rate_array(mp->cck_rates, sband,
|
|
minstrel_cck_bitrates,
|
|
ARRAY_SIZE(minstrel_cck_bitrates),
|
|
rate_flags);
|
|
}
|
|
|
|
static void
|
|
minstrel_ht_init_ofdm_rates(struct minstrel_priv *mp, enum nl80211_band band)
|
|
{
|
|
static const s16 bitrates[8] = { 60, 90, 120, 180, 240, 360, 480, 540 };
|
|
struct ieee80211_supported_band *sband;
|
|
u32 rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef);
|
|
|
|
memset(mp->ofdm_rates[band], 0xff, sizeof(mp->ofdm_rates[band]));
|
|
sband = mp->hw->wiphy->bands[band];
|
|
if (!sband)
|
|
return;
|
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(mp->ofdm_rates[band]) != ARRAY_SIZE(bitrates));
|
|
minstrel_ht_fill_rate_array(mp->ofdm_rates[band], sband,
|
|
minstrel_ofdm_bitrates,
|
|
ARRAY_SIZE(minstrel_ofdm_bitrates),
|
|
rate_flags);
|
|
}
|
|
|
|
static void *
|
|
minstrel_ht_alloc(struct ieee80211_hw *hw)
|
|
{
|
|
struct minstrel_priv *mp;
|
|
int i;
|
|
|
|
mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC);
|
|
if (!mp)
|
|
return NULL;
|
|
|
|
/* contention window settings
|
|
* Just an approximation. Using the per-queue values would complicate
|
|
* the calculations and is probably unnecessary */
|
|
mp->cw_min = 15;
|
|
mp->cw_max = 1023;
|
|
|
|
/* maximum time that the hw is allowed to stay in one MRR segment */
|
|
mp->segment_size = 6000;
|
|
|
|
if (hw->max_rate_tries > 0)
|
|
mp->max_retry = hw->max_rate_tries;
|
|
else
|
|
/* safe default, does not necessarily have to match hw properties */
|
|
mp->max_retry = 7;
|
|
|
|
if (hw->max_rates >= 4)
|
|
mp->has_mrr = true;
|
|
|
|
mp->hw = hw;
|
|
mp->update_interval = HZ / 20;
|
|
|
|
minstrel_ht_init_cck_rates(mp);
|
|
for (i = 0; i < ARRAY_SIZE(mp->hw->wiphy->bands); i++)
|
|
minstrel_ht_init_ofdm_rates(mp, i);
|
|
|
|
return mp;
|
|
}
|
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
static void minstrel_ht_add_debugfs(struct ieee80211_hw *hw, void *priv,
|
|
struct dentry *debugfsdir)
|
|
{
|
|
struct minstrel_priv *mp = priv;
|
|
|
|
mp->fixed_rate_idx = (u32) -1;
|
|
debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir,
|
|
&mp->fixed_rate_idx);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
minstrel_ht_free(void *priv)
|
|
{
|
|
kfree(priv);
|
|
}
|
|
|
|
static u32 minstrel_ht_get_expected_throughput(void *priv_sta)
|
|
{
|
|
struct minstrel_ht_sta *mi = priv_sta;
|
|
int i, j, prob, tp_avg;
|
|
|
|
i = MI_RATE_GROUP(mi->max_tp_rate[0]);
|
|
j = MI_RATE_IDX(mi->max_tp_rate[0]);
|
|
prob = mi->groups[i].rates[j].prob_avg;
|
|
|
|
/* convert tp_avg from pkt per second in kbps */
|
|
tp_avg = minstrel_ht_get_tp_avg(mi, i, j, prob) * 10;
|
|
tp_avg = tp_avg * AVG_PKT_SIZE * 8 / 1024;
|
|
|
|
return tp_avg;
|
|
}
|
|
|
|
static const struct rate_control_ops mac80211_minstrel_ht = {
|
|
.name = "minstrel_ht",
|
|
.tx_status_ext = 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_debugfs = minstrel_ht_add_debugfs,
|
|
.add_sta_debugfs = minstrel_ht_add_sta_debugfs,
|
|
#endif
|
|
.get_expected_throughput = minstrel_ht_get_expected_throughput,
|
|
};
|
|
|
|
|
|
static void __init 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++) {
|
|
prandom_bytes(rnd, sizeof(rnd));
|
|
for (i = 0; i < MCS_GROUP_RATES; i++) {
|
|
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_init(void)
|
|
{
|
|
init_sample_table();
|
|
return ieee80211_rate_control_register(&mac80211_minstrel_ht);
|
|
}
|
|
|
|
void
|
|
rc80211_minstrel_exit(void)
|
|
{
|
|
ieee80211_rate_control_unregister(&mac80211_minstrel_ht);
|
|
}
|