mt76x2: apply coverage class on slot time too (0d45d3fe) · Commits · 戴 / test

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>

drivers/net/wireless/mediatek/mt76/mt76x2_init.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);

drivers/net/wireless/mediatek/mt76/mt76x2_main.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -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);

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