* [PATCH AUTOSEL 5.8 06/24] mt76: mt7615: reduce maximum VHT MPDU length to 7991
[not found] <20201012190239.3279198-1-sashal@kernel.org>
@ 2020-10-12 19:02 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2020-10-12 19:02 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Sasha Levin, netdev, linux-wireless, linux-mediatek, Kalle Valo,
linux-arm-kernel, Felix Fietkau
From: Felix Fietkau <nbd@nbd.name>
[ Upstream commit efb1676306f664625c0c546dd10d18d33c75e3fc ]
After fixing mac80211 to allow larger A-MSDUs in some cases, there have been
reports of performance regressions and packet loss with some clients.
It appears that the issue occurs when the hardware is transmitting A-MSDUs
bigger than 8k. Limit the local VHT MPDU size capability to 7991, matching
the value used for MT7915 as well.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200923052442.24141-1-nbd@nbd.name
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/mediatek/mt76/mt7615/init.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/init.c b/drivers/net/wireless/mediatek/mt76/mt7615/init.c
index e2d80518e5af9..992a36602ad4c 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/init.c
@@ -453,7 +453,7 @@ void mt7615_init_device(struct mt7615_dev *dev)
dev->mphy.sband_2g.sband.ht_cap.cap |= IEEE80211_HT_CAP_LDPC_CODING;
dev->mphy.sband_5g.sband.ht_cap.cap |= IEEE80211_HT_CAP_LDPC_CODING;
dev->mphy.sband_5g.sband.vht_cap.cap |=
- IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 |
+ IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 |
IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
mt7615_cap_dbdc_disable(dev);
dev->phy.dfs_state = -1;
--
2.25.1
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2020-10-12 19:02 ` [PATCH AUTOSEL 5.8 06/24] mt76: mt7615: reduce maximum VHT MPDU length to 7991 Sasha Levin
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