+++ /dev/null
-// SPDX-License-Identifier: ISC
-/*
- * Copyright (C) 2019 Felix Fietkau <nbd@nbd.name>
- */
-
-#include "mt76.h"
-
-#define AVG_PKT_SIZE 1024
-
-/* Number of bits for an average sized packet */
-#define MCS_NBITS (AVG_PKT_SIZE << 3)
-
-/* Number of symbols for a packet with (bps) bits per symbol */
-#define MCS_NSYMS(bps) DIV_ROUND_UP(MCS_NBITS, (bps))
-
-/* Transmission time (1024 usec) for a packet containing (syms) * symbols */
-#define MCS_SYMBOL_TIME(sgi, syms) \
- (sgi ? \
- ((syms) * 18 * 1024 + 4 * 1024) / 5 : /* syms * 3.6 us */ \
- ((syms) * 1024) << 2 /* syms * 4 us */ \
- )
-
-/* Transmit duration for the raw data part of an average sized packet */
-#define MCS_DURATION(streams, sgi, bps) \
- MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps)))
-
-#define BW_20 0
-#define BW_40 1
-#define BW_80 2
-
-/*
- * Define group sort order: HT40 -> SGI -> #streams
- */
-#define MT_MAX_STREAMS 4
-#define MT_HT_STREAM_GROUPS 4 /* BW(=2) * SGI(=2) */
-#define MT_VHT_STREAM_GROUPS 6 /* BW(=3) * SGI(=2) */
-
-#define MT_HT_GROUPS_NB (MT_MAX_STREAMS * \
- MT_HT_STREAM_GROUPS)
-#define MT_VHT_GROUPS_NB (MT_MAX_STREAMS * \
- MT_VHT_STREAM_GROUPS)
-#define MT_GROUPS_NB (MT_HT_GROUPS_NB + \
- MT_VHT_GROUPS_NB)
-
-#define MT_HT_GROUP_0 0
-#define MT_VHT_GROUP_0 (MT_HT_GROUP_0 + MT_HT_GROUPS_NB)
-
-#define MCS_GROUP_RATES 10
-
-#define HT_GROUP_IDX(_streams, _sgi, _ht40) \
- MT_HT_GROUP_0 + \
- MT_MAX_STREAMS * 2 * _ht40 + \
- MT_MAX_STREAMS * _sgi + \
- _streams - 1
-
-#define _MAX(a, b) (((a)>(b))?(a):(b))
-
-#define GROUP_SHIFT(duration) \
- _MAX(0, 16 - __builtin_clz(duration))
-
-/* MCS rate information for an MCS group */
-#define __MCS_GROUP(_streams, _sgi, _ht40, _s) \
- [HT_GROUP_IDX(_streams, _sgi, _ht40)] = { \
- .shift = _s, \
- .duration = { \
- MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26) >> _s, \
- MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52) >> _s, \
- MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78) >> _s, \
- MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104) >> _s, \
- MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156) >> _s, \
- MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208) >> _s, \
- MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234) >> _s, \
- MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) >> _s \
- } \
-}
-
-#define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \
- GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26))
-
-#define MCS_GROUP(_streams, _sgi, _ht40) \
- __MCS_GROUP(_streams, _sgi, _ht40, \
- MCS_GROUP_SHIFT(_streams, _sgi, _ht40))
-
-#define VHT_GROUP_IDX(_streams, _sgi, _bw) \
- (MT_VHT_GROUP_0 + \
- MT_MAX_STREAMS * 2 * (_bw) + \
- MT_MAX_STREAMS * (_sgi) + \
- (_streams) - 1)
-
-#define BW2VBPS(_bw, r3, r2, r1) \
- (_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1)
-
-#define __VHT_GROUP(_streams, _sgi, _bw, _s) \
- [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \
- .shift = _s, \
- .duration = { \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 117, 54, 26)) >> _s, \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 234, 108, 52)) >> _s, \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 351, 162, 78)) >> _s, \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 468, 216, 104)) >> _s, \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 702, 324, 156)) >> _s, \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 936, 432, 208)) >> _s, \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 1053, 486, 234)) >> _s, \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 1170, 540, 260)) >> _s, \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 1404, 648, 312)) >> _s, \
- MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 1560, 720, 346)) >> _s \
- } \
-}
-
-#define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \
- GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \
- BW2VBPS(_bw, 117, 54, 26)))
-
-#define VHT_GROUP(_streams, _sgi, _bw) \
- __VHT_GROUP(_streams, _sgi, _bw, \
- VHT_GROUP_SHIFT(_streams, _sgi, _bw))
-
-struct mcs_group {
- u8 shift;
- u16 duration[MCS_GROUP_RATES];
-};
-
-static const struct mcs_group airtime_mcs_groups[] = {
- MCS_GROUP(1, 0, BW_20),
- MCS_GROUP(2, 0, BW_20),
- MCS_GROUP(3, 0, BW_20),
- MCS_GROUP(4, 0, BW_20),
-
- MCS_GROUP(1, 1, BW_20),
- MCS_GROUP(2, 1, BW_20),
- MCS_GROUP(3, 1, BW_20),
- MCS_GROUP(4, 1, BW_20),
-
- MCS_GROUP(1, 0, BW_40),
- MCS_GROUP(2, 0, BW_40),
- MCS_GROUP(3, 0, BW_40),
- MCS_GROUP(4, 0, BW_40),
-
- MCS_GROUP(1, 1, BW_40),
- MCS_GROUP(2, 1, BW_40),
- MCS_GROUP(3, 1, BW_40),
- MCS_GROUP(4, 1, BW_40),
-
- VHT_GROUP(1, 0, BW_20),
- VHT_GROUP(2, 0, BW_20),
- VHT_GROUP(3, 0, BW_20),
- VHT_GROUP(4, 0, BW_20),
-
- VHT_GROUP(1, 1, BW_20),
- VHT_GROUP(2, 1, BW_20),
- VHT_GROUP(3, 1, BW_20),
- VHT_GROUP(4, 1, BW_20),
-
- VHT_GROUP(1, 0, BW_40),
- VHT_GROUP(2, 0, BW_40),
- VHT_GROUP(3, 0, BW_40),
- VHT_GROUP(4, 0, BW_40),
-
- VHT_GROUP(1, 1, BW_40),
- VHT_GROUP(2, 1, BW_40),
- VHT_GROUP(3, 1, BW_40),
- VHT_GROUP(4, 1, BW_40),
-
- VHT_GROUP(1, 0, BW_80),
- VHT_GROUP(2, 0, BW_80),
- VHT_GROUP(3, 0, BW_80),
- VHT_GROUP(4, 0, BW_80),
-
- VHT_GROUP(1, 1, BW_80),
- VHT_GROUP(2, 1, BW_80),
- VHT_GROUP(3, 1, BW_80),
- VHT_GROUP(4, 1, BW_80),
-};
-
-static u32
-mt76_calc_legacy_rate_duration(const struct ieee80211_rate *rate, bool short_pre,
- int len)
-{
- u32 duration;
-
- switch (rate->hw_value >> 8) {
- case MT_PHY_TYPE_CCK:
- duration = 144 + 48; /* preamble + PLCP */
- if (short_pre)
- duration >>= 1;
-
- duration += 10; /* SIFS */
- break;
- case MT_PHY_TYPE_OFDM:
- duration = 20 + 16; /* premable + SIFS */
- break;
- default:
- WARN_ON_ONCE(1);
- return 0;
- }
-
- len <<= 3;
- duration += (len * 10) / rate->bitrate;
-
- return duration;
-}
-
-u32 mt76_calc_rx_airtime(struct mt76_dev *dev, struct mt76_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;
- u32 duration;
- int group, idx;
-
- 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;
- 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 = dev->hw->wiphy->bands[status->band];
- if (!sband || status->rate_idx >= sband->n_bitrates)
- return 0;
-
- rate = &sband->bitrates[status->rate_idx];
-
- return mt76_calc_legacy_rate_duration(rate, sp, 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;
- default:
- WARN_ON_ONCE(1);
- return 0;
- }
-
- if (WARN_ON_ONCE(streams > 4))
- 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;
-}
-
-u32 mt76_calc_tx_airtime(struct mt76_dev *dev, struct ieee80211_tx_info *info,
- int len)
-{
- struct mt76_rx_status stat = {
- .band = info->band,
- };
- 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;
-
- if (rate->idx < 0 || !rate->count)
- break;
-
- 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;
- }
-
- cur_duration = mt76_calc_rx_airtime(dev, &stat, len);
- duration += cur_duration * rate->count;
- }
-
- return duration;
-}
-EXPORT_SYMBOL_GPL(mt76_calc_tx_airtime);
projects / platform / kernel / linux-rpi.git / commitdiff