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mt76x2: apply coverage class on slot time too

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According to 802.11-2007 17.3.8.6 (slot time), the slot time should
be increased by 3 us * coverage class. Taking into account coverage
class in slot time configuration allows to increase by an order of
magnitude the throughput on a 4Km link in a noisy environment

Tested-by: Luca Bisti <luca.bisti@gmail.com>
Tested-by: Gaetano Catalli <gaetano.catalli@gmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Acked-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Lorenzo Bianconi 2018-05-15 12:08:14 +02:00 committed by Kalle Valo
parent d2280e8e9c
commit 0d45d3fe42
2 changed files with 4 additions and 2 deletions
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3
drivers/net/wireless/mediatek/mt76/mt76x2_init.c
View file

@ -482,7 +482,10 @@ void mt76x2_set_tx_ackto(struct mt76x2_dev *dev)
{
u8 ackto, sifs, slottime = dev->slottime;
/* As defined by IEEE 802.11-2007 17.3.8.6 */
slottime += 3 * dev->coverage_class;
mt76_rmw_field(dev, MT_BKOFF_SLOT_CFG,
MT_BKOFF_SLOT_CFG_SLOTTIME, slottime);
sifs = mt76_get_field(dev, MT_XIFS_TIME_CFG,
MT_XIFS_TIME_CFG_OFDM_SIFS);

3
drivers/net/wireless/mediatek/mt76/mt76x2_main.c
View file

@ -247,8 +247,7 @@ mt76x2_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
int slottime = info->use_short_slot ? 9 : 20;
dev->slottime = slottime;
mt76_rmw_field(dev, MT_BKOFF_SLOT_CFG,
MT_BKOFF_SLOT_CFG_SLOTTIME, slottime);
mt76x2_set_tx_ackto(dev);
}
mutex_unlock(&dev->mutex);