2015-09-24 14:59:50

by Felix Fietkau

Subject: [PATCH 4.3] ath9k: declare required extra tx headroom

ath9k inserts padding between the 802.11 header and the data area (to
align it). Since it didn't declare this extra required headroom, this
led to some nasty issues like randomly dropped packets in some setups.

Cc: [email protected]
Signed-off-by: Felix Fietkau <[email protected]>
---
drivers/net/wireless/ath/ath9k/init.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 57f95f2..90eb750 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -880,6 +880,7 @@ static void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
hw->max_rate_tries = 10;
hw->sta_data_size = sizeof(struct ath_node);
hw->vif_data_size = sizeof(struct ath_vif);
+ hw->extra_tx_headroom = 4;

hw->wiphy->available_antennas_rx = BIT(ah->caps.max_rxchains) - 1;
hw->wiphy->available_antennas_tx = BIT(ah->caps.max_txchains) - 1;
--
2.2.2

2015-09-26 17:35:09

by Kalle Valo

Subject: Re: [4.3] ath9k: declare required extra tx headroom

> ath9k inserts padding between the 802.11 header and the data area (to
> align it). Since it didn't declare this extra required headroom, this
> led to some nasty issues like randomly dropped packets in some setups.
>
> Cc: [email protected]
> Signed-off-by: Felix Fietkau <[email protected]>

Thanks, applied to wireless-drivers.git.

Kalle Valo