614 lines
17 KiB
C
614 lines
17 KiB
C
// SPDX-License-Identifier: ISC
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/*
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* Copyright (C) 2019 Felix Fietkau <nbd@nbd.name>
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*/
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "sta_info.h"
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#define AVG_PKT_SIZE 1024
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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 kilo-symbols (symbols * 1024) for a packet with (bps) bits per
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* symbol. We use k-symbols to avoid rounding in the _TIME macros below.
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*/
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#define MCS_N_KSYMS(bps) DIV_ROUND_UP(MCS_NBITS << 10, (bps))
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/* Transmission time (in 1024 * usec) for a packet containing (ksyms) * 1024
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* symbols.
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*/
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#define MCS_SYMBOL_TIME(sgi, ksyms) \
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(sgi ? \
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((ksyms) * 4 * 18) / 20 : /* 3.6 us per sym */ \
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((ksyms) * 4) /* 4.0 us per sym */ \
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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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((u32)MCS_SYMBOL_TIME(sgi, MCS_N_KSYMS((streams) * (bps))))
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#define MCS_DURATION_S(shift, streams, sgi, bps) \
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((u16)((MCS_DURATION(streams, sgi, bps) >> shift)))
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/* These should match the values in enum nl80211_he_gi */
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#define HE_GI_08 0
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#define HE_GI_16 1
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#define HE_GI_32 2
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/* Transmission time (1024 usec) for a packet containing (ksyms) * k-symbols */
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#define HE_SYMBOL_TIME(gi, ksyms) \
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(gi == HE_GI_08 ? \
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((ksyms) * 16 * 17) / 20 : /* 13.6 us per sym */ \
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(gi == HE_GI_16 ? \
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((ksyms) * 16 * 18) / 20 : /* 14.4 us per sym */ \
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((ksyms) * 16) /* 16.0 us per sym */ \
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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 HE_DURATION(streams, gi, bps) \
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((u32)HE_SYMBOL_TIME(gi, MCS_N_KSYMS((streams) * (bps))))
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#define HE_DURATION_S(shift, streams, gi, bps) \
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(HE_DURATION(streams, gi, bps) >> shift)
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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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#define BW_160 3
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/*
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* Define group sort order: HT40 -> SGI -> #streams
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*/
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#define IEEE80211_MAX_STREAMS 4
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#define IEEE80211_HT_STREAM_GROUPS 4 /* BW(=2) * SGI(=2) */
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#define IEEE80211_VHT_STREAM_GROUPS 8 /* BW(=4) * SGI(=2) */
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#define IEEE80211_HE_MAX_STREAMS 8
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#define IEEE80211_HE_STREAM_GROUPS 12 /* BW(=4) * GI(=3) */
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#define IEEE80211_HT_GROUPS_NB (IEEE80211_MAX_STREAMS * \
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IEEE80211_HT_STREAM_GROUPS)
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#define IEEE80211_VHT_GROUPS_NB (IEEE80211_MAX_STREAMS * \
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IEEE80211_VHT_STREAM_GROUPS)
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#define IEEE80211_HE_GROUPS_NB (IEEE80211_HE_MAX_STREAMS * \
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IEEE80211_HE_STREAM_GROUPS)
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#define IEEE80211_GROUPS_NB (IEEE80211_HT_GROUPS_NB + \
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IEEE80211_VHT_GROUPS_NB + \
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IEEE80211_HE_GROUPS_NB)
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#define IEEE80211_HT_GROUP_0 0
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#define IEEE80211_VHT_GROUP_0 (IEEE80211_HT_GROUP_0 + IEEE80211_HT_GROUPS_NB)
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#define IEEE80211_HE_GROUP_0 (IEEE80211_VHT_GROUP_0 + IEEE80211_VHT_GROUPS_NB)
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#define MCS_GROUP_RATES 12
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#define HT_GROUP_IDX(_streams, _sgi, _ht40) \
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IEEE80211_HT_GROUP_0 + \
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IEEE80211_MAX_STREAMS * 2 * _ht40 + \
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IEEE80211_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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[HT_GROUP_IDX(_streams, _sgi, _ht40)] = { \
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.shift = _s, \
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.duration = { \
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MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 54 : 26), \
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MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 108 : 52), \
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MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 162 : 78), \
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MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 216 : 104), \
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MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 324 : 156), \
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MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 432 : 208), \
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MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 486 : 234), \
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MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 540 : 260) \
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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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(IEEE80211_VHT_GROUP_0 + \
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IEEE80211_MAX_STREAMS * 2 * (_bw) + \
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IEEE80211_MAX_STREAMS * (_sgi) + \
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(_streams) - 1)
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#define BW2VBPS(_bw, r4, r3, r2, r1) \
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(_bw == BW_160 ? r4 : _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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.shift = _s, \
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.duration = { \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 234, 117, 54, 26)), \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 468, 234, 108, 52)), \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 702, 351, 162, 78)), \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 936, 468, 216, 104)), \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 1404, 702, 324, 156)), \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 1872, 936, 432, 208)), \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 2106, 1053, 486, 234)), \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 2340, 1170, 540, 260)), \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 2808, 1404, 648, 312)), \
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MCS_DURATION_S(_s, _streams, _sgi, \
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BW2VBPS(_bw, 3120, 1560, 720, 346)) \
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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, 243, 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 HE_GROUP_IDX(_streams, _gi, _bw) \
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(IEEE80211_HE_GROUP_0 + \
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IEEE80211_HE_MAX_STREAMS * 3 * (_bw) + \
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IEEE80211_HE_MAX_STREAMS * (_gi) + \
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(_streams) - 1)
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#define __HE_GROUP(_streams, _gi, _bw, _s) \
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[HE_GROUP_IDX(_streams, _gi, _bw)] = { \
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.shift = _s, \
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.duration = { \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 979, 489, 230, 115)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 1958, 979, 475, 230)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 2937, 1468, 705, 345)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 3916, 1958, 936, 475)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 5875, 2937, 1411, 705)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 7833, 3916, 1872, 936)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 8827, 4406, 2102, 1051)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 9806, 4896, 2347, 1166)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 11764, 5875, 2808, 1411)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 13060, 6523, 3124, 1555)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 14702, 7344, 3513, 1756)), \
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HE_DURATION_S(_s, _streams, _gi, \
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BW2VBPS(_bw, 16329, 8164, 3902, 1944)) \
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} \
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}
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#define HE_GROUP_SHIFT(_streams, _gi, _bw) \
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GROUP_SHIFT(HE_DURATION(_streams, _gi, \
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BW2VBPS(_bw, 979, 489, 230, 115)))
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#define HE_GROUP(_streams, _gi, _bw) \
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__HE_GROUP(_streams, _gi, _bw, \
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HE_GROUP_SHIFT(_streams, _gi, _bw))
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struct mcs_group {
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u8 shift;
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u16 duration[MCS_GROUP_RATES];
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};
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static const struct mcs_group airtime_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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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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VHT_GROUP(1, 0, BW_160),
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VHT_GROUP(2, 0, BW_160),
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VHT_GROUP(3, 0, BW_160),
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VHT_GROUP(4, 0, BW_160),
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VHT_GROUP(1, 1, BW_160),
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VHT_GROUP(2, 1, BW_160),
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VHT_GROUP(3, 1, BW_160),
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VHT_GROUP(4, 1, BW_160),
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HE_GROUP(1, HE_GI_08, BW_20),
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HE_GROUP(2, HE_GI_08, BW_20),
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HE_GROUP(3, HE_GI_08, BW_20),
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HE_GROUP(4, HE_GI_08, BW_20),
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HE_GROUP(5, HE_GI_08, BW_20),
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HE_GROUP(6, HE_GI_08, BW_20),
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HE_GROUP(7, HE_GI_08, BW_20),
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HE_GROUP(8, HE_GI_08, BW_20),
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HE_GROUP(1, HE_GI_16, BW_20),
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HE_GROUP(2, HE_GI_16, BW_20),
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HE_GROUP(3, HE_GI_16, BW_20),
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HE_GROUP(4, HE_GI_16, BW_20),
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HE_GROUP(5, HE_GI_16, BW_20),
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HE_GROUP(6, HE_GI_16, BW_20),
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HE_GROUP(7, HE_GI_16, BW_20),
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HE_GROUP(8, HE_GI_16, BW_20),
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HE_GROUP(1, HE_GI_32, BW_20),
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HE_GROUP(2, HE_GI_32, BW_20),
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HE_GROUP(3, HE_GI_32, BW_20),
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HE_GROUP(4, HE_GI_32, BW_20),
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HE_GROUP(5, HE_GI_32, BW_20),
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HE_GROUP(6, HE_GI_32, BW_20),
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HE_GROUP(7, HE_GI_32, BW_20),
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HE_GROUP(8, HE_GI_32, BW_20),
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HE_GROUP(1, HE_GI_08, BW_40),
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HE_GROUP(2, HE_GI_08, BW_40),
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HE_GROUP(3, HE_GI_08, BW_40),
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HE_GROUP(4, HE_GI_08, BW_40),
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HE_GROUP(5, HE_GI_08, BW_40),
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HE_GROUP(6, HE_GI_08, BW_40),
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HE_GROUP(7, HE_GI_08, BW_40),
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HE_GROUP(8, HE_GI_08, BW_40),
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HE_GROUP(1, HE_GI_16, BW_40),
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HE_GROUP(2, HE_GI_16, BW_40),
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HE_GROUP(3, HE_GI_16, BW_40),
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HE_GROUP(4, HE_GI_16, BW_40),
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HE_GROUP(5, HE_GI_16, BW_40),
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HE_GROUP(6, HE_GI_16, BW_40),
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HE_GROUP(7, HE_GI_16, BW_40),
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HE_GROUP(8, HE_GI_16, BW_40),
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HE_GROUP(1, HE_GI_32, BW_40),
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HE_GROUP(2, HE_GI_32, BW_40),
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HE_GROUP(3, HE_GI_32, BW_40),
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HE_GROUP(4, HE_GI_32, BW_40),
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HE_GROUP(5, HE_GI_32, BW_40),
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HE_GROUP(6, HE_GI_32, BW_40),
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HE_GROUP(7, HE_GI_32, BW_40),
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HE_GROUP(8, HE_GI_32, BW_40),
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HE_GROUP(1, HE_GI_08, BW_80),
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HE_GROUP(2, HE_GI_08, BW_80),
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HE_GROUP(3, HE_GI_08, BW_80),
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HE_GROUP(4, HE_GI_08, BW_80),
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HE_GROUP(5, HE_GI_08, BW_80),
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HE_GROUP(6, HE_GI_08, BW_80),
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HE_GROUP(7, HE_GI_08, BW_80),
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HE_GROUP(8, HE_GI_08, BW_80),
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HE_GROUP(1, HE_GI_16, BW_80),
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HE_GROUP(2, HE_GI_16, BW_80),
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HE_GROUP(3, HE_GI_16, BW_80),
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HE_GROUP(4, HE_GI_16, BW_80),
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HE_GROUP(5, HE_GI_16, BW_80),
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HE_GROUP(6, HE_GI_16, BW_80),
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HE_GROUP(7, HE_GI_16, BW_80),
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HE_GROUP(8, HE_GI_16, BW_80),
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HE_GROUP(1, HE_GI_32, BW_80),
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HE_GROUP(2, HE_GI_32, BW_80),
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HE_GROUP(3, HE_GI_32, BW_80),
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HE_GROUP(4, HE_GI_32, BW_80),
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HE_GROUP(5, HE_GI_32, BW_80),
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HE_GROUP(6, HE_GI_32, BW_80),
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HE_GROUP(7, HE_GI_32, BW_80),
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HE_GROUP(8, HE_GI_32, BW_80),
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HE_GROUP(1, HE_GI_08, BW_160),
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HE_GROUP(2, HE_GI_08, BW_160),
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HE_GROUP(3, HE_GI_08, BW_160),
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HE_GROUP(4, HE_GI_08, BW_160),
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HE_GROUP(5, HE_GI_08, BW_160),
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HE_GROUP(6, HE_GI_08, BW_160),
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HE_GROUP(7, HE_GI_08, BW_160),
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HE_GROUP(8, HE_GI_08, BW_160),
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HE_GROUP(1, HE_GI_16, BW_160),
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HE_GROUP(2, HE_GI_16, BW_160),
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HE_GROUP(3, HE_GI_16, BW_160),
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HE_GROUP(4, HE_GI_16, BW_160),
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HE_GROUP(5, HE_GI_16, BW_160),
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HE_GROUP(6, HE_GI_16, BW_160),
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HE_GROUP(7, HE_GI_16, BW_160),
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HE_GROUP(8, HE_GI_16, BW_160),
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HE_GROUP(1, HE_GI_32, BW_160),
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HE_GROUP(2, HE_GI_32, BW_160),
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HE_GROUP(3, HE_GI_32, BW_160),
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HE_GROUP(4, HE_GI_32, BW_160),
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HE_GROUP(5, HE_GI_32, BW_160),
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HE_GROUP(6, HE_GI_32, BW_160),
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HE_GROUP(7, HE_GI_32, BW_160),
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HE_GROUP(8, HE_GI_32, BW_160),
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};
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static u32
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ieee80211_calc_legacy_rate_duration(u16 bitrate, bool short_pre,
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bool cck, int len)
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{
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u32 duration;
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if (cck) {
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duration = 144 + 48; /* preamble + PLCP */
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if (short_pre)
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duration >>= 1;
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|
|
|
duration += 10; /* SIFS */
|
|
} else {
|
|
duration = 20 + 16; /* premable + SIFS */
|
|
}
|
|
|
|
len <<= 3;
|
|
duration += (len * 10) / bitrate;
|
|
|
|
return duration;
|
|
}
|
|
|
|
u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw,
|
|
struct ieee80211_rx_status *status,
|
|
int len)
|
|
{
|
|
struct ieee80211_supported_band *sband;
|
|
const struct ieee80211_rate *rate;
|
|
bool sgi = status->enc_flags & RX_ENC_FLAG_SHORT_GI;
|
|
bool sp = status->enc_flags & RX_ENC_FLAG_SHORTPRE;
|
|
int bw, streams;
|
|
int group, idx;
|
|
u32 duration;
|
|
bool cck;
|
|
|
|
switch (status->bw) {
|
|
case RATE_INFO_BW_20:
|
|
bw = BW_20;
|
|
break;
|
|
case RATE_INFO_BW_40:
|
|
bw = BW_40;
|
|
break;
|
|
case RATE_INFO_BW_80:
|
|
bw = BW_80;
|
|
break;
|
|
case RATE_INFO_BW_160:
|
|
bw = BW_160;
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
return 0;
|
|
}
|
|
|
|
switch (status->encoding) {
|
|
case RX_ENC_LEGACY:
|
|
if (WARN_ON_ONCE(status->band > NL80211_BAND_5GHZ))
|
|
return 0;
|
|
|
|
sband = hw->wiphy->bands[status->band];
|
|
if (!sband || status->rate_idx >= sband->n_bitrates)
|
|
return 0;
|
|
|
|
rate = &sband->bitrates[status->rate_idx];
|
|
cck = rate->flags & IEEE80211_RATE_MANDATORY_B;
|
|
|
|
return ieee80211_calc_legacy_rate_duration(rate->bitrate, sp,
|
|
cck, len);
|
|
|
|
case RX_ENC_VHT:
|
|
streams = status->nss;
|
|
idx = status->rate_idx;
|
|
group = VHT_GROUP_IDX(streams, sgi, bw);
|
|
break;
|
|
case RX_ENC_HT:
|
|
streams = ((status->rate_idx >> 3) & 3) + 1;
|
|
idx = status->rate_idx & 7;
|
|
group = HT_GROUP_IDX(streams, sgi, bw);
|
|
break;
|
|
case RX_ENC_HE:
|
|
streams = status->nss;
|
|
idx = status->rate_idx;
|
|
group = HE_GROUP_IDX(streams, status->he_gi, bw);
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
return 0;
|
|
}
|
|
|
|
if (WARN_ON_ONCE((status->encoding != RX_ENC_HE && streams > 4) ||
|
|
(status->encoding == RX_ENC_HE && streams > 8)))
|
|
return 0;
|
|
|
|
duration = airtime_mcs_groups[group].duration[idx];
|
|
duration <<= airtime_mcs_groups[group].shift;
|
|
duration *= len;
|
|
duration /= AVG_PKT_SIZE;
|
|
duration /= 1024;
|
|
|
|
duration += 36 + (streams << 2);
|
|
|
|
return duration;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ieee80211_calc_rx_airtime);
|
|
|
|
static u32 ieee80211_calc_tx_airtime_rate(struct ieee80211_hw *hw,
|
|
struct ieee80211_tx_rate *rate,
|
|
u8 band, int len)
|
|
{
|
|
struct ieee80211_rx_status stat = {
|
|
.band = band,
|
|
};
|
|
|
|
if (rate->idx < 0 || !rate->count)
|
|
return 0;
|
|
|
|
if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
|
|
stat.bw = RATE_INFO_BW_80;
|
|
else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
|
|
stat.bw = RATE_INFO_BW_40;
|
|
else
|
|
stat.bw = RATE_INFO_BW_20;
|
|
|
|
stat.enc_flags = 0;
|
|
if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
|
|
stat.enc_flags |= RX_ENC_FLAG_SHORTPRE;
|
|
if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
|
|
stat.enc_flags |= RX_ENC_FLAG_SHORT_GI;
|
|
|
|
stat.rate_idx = rate->idx;
|
|
if (rate->flags & IEEE80211_TX_RC_VHT_MCS) {
|
|
stat.encoding = RX_ENC_VHT;
|
|
stat.rate_idx = ieee80211_rate_get_vht_mcs(rate);
|
|
stat.nss = ieee80211_rate_get_vht_nss(rate);
|
|
} else if (rate->flags & IEEE80211_TX_RC_MCS) {
|
|
stat.encoding = RX_ENC_HT;
|
|
} else {
|
|
stat.encoding = RX_ENC_LEGACY;
|
|
}
|
|
|
|
return ieee80211_calc_rx_airtime(hw, &stat, len);
|
|
}
|
|
|
|
u32 ieee80211_calc_tx_airtime(struct ieee80211_hw *hw,
|
|
struct ieee80211_tx_info *info,
|
|
int len)
|
|
{
|
|
u32 duration = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(info->status.rates); i++) {
|
|
struct ieee80211_tx_rate *rate = &info->status.rates[i];
|
|
u32 cur_duration;
|
|
|
|
cur_duration = ieee80211_calc_tx_airtime_rate(hw, rate,
|
|
info->band, len);
|
|
if (!cur_duration)
|
|
break;
|
|
|
|
duration += cur_duration * rate->count;
|
|
}
|
|
|
|
return duration;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ieee80211_calc_tx_airtime);
|
|
|
|
u32 ieee80211_calc_expected_tx_airtime(struct ieee80211_hw *hw,
|
|
struct ieee80211_vif *vif,
|
|
struct ieee80211_sta *pubsta,
|
|
int len, bool ampdu)
|
|
{
|
|
struct ieee80211_supported_band *sband;
|
|
struct ieee80211_chanctx_conf *conf;
|
|
int rateidx, shift = 0;
|
|
bool cck, short_pream;
|
|
u32 basic_rates;
|
|
u8 band = 0;
|
|
u16 rate;
|
|
|
|
len += 38; /* Ethernet header length */
|
|
|
|
conf = rcu_dereference(vif->chanctx_conf);
|
|
if (conf) {
|
|
band = conf->def.chan->band;
|
|
shift = ieee80211_chandef_get_shift(&conf->def);
|
|
}
|
|
|
|
if (pubsta) {
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info,
|
|
sta);
|
|
struct ieee80211_tx_rate *rate = &sta->tx_stats.last_rate;
|
|
u32 airtime;
|
|
|
|
if (!(rate->flags & (IEEE80211_TX_RC_VHT_MCS |
|
|
IEEE80211_TX_RC_MCS)))
|
|
ampdu = false;
|
|
|
|
/*
|
|
* Assume that HT/VHT transmission on any AC except VO will
|
|
* use aggregation. Since we don't have reliable reporting
|
|
* of aggregation length, assume an average of 16.
|
|
* This will not be very accurate, but much better than simply
|
|
* assuming un-aggregated tx.
|
|
*/
|
|
airtime = ieee80211_calc_tx_airtime_rate(hw, rate, band,
|
|
ampdu ? len * 16 : len);
|
|
if (ampdu)
|
|
airtime /= 16;
|
|
|
|
return airtime;
|
|
}
|
|
|
|
if (!conf)
|
|
return 0;
|
|
|
|
/* No station to get latest rate from, so calculate the worst-case
|
|
* duration using the lowest configured basic rate.
|
|
*/
|
|
sband = hw->wiphy->bands[band];
|
|
|
|
basic_rates = vif->bss_conf.basic_rates;
|
|
short_pream = vif->bss_conf.use_short_preamble;
|
|
|
|
rateidx = basic_rates ? ffs(basic_rates) - 1 : 0;
|
|
rate = sband->bitrates[rateidx].bitrate << shift;
|
|
cck = sband->bitrates[rateidx].flags & IEEE80211_RATE_MANDATORY_B;
|
|
|
|
return ieee80211_calc_legacy_rate_duration(rate, short_pream, cck, len);
|
|
}
|