From d3fd2c95c1c13ec217d43ebef3c61cfa00a6cd37 Mon Sep 17 00:00:00 2001 From: Loic Poulain Date: Mon, 25 Oct 2021 16:12:18 +0300 Subject: [PATCH] wcn36xx: Fix (QoS) null data frame bitrate/modulation We observe unexpected connection drops with some APs due to non-acked mac80211 generated null data frames (keep-alive). After debugging and capture, we noticed that null frames are submitted at standard data bitrate and that the given APs are in trouble with that. After setting the null frame bitrate to control bitrate, all null frames are acked as expected and connection is maintained. Not sure if it's a requirement of the specification, but it seems the right thing to do anyway, null frames are mostly used for control purpose (power-saving, keep-alive...), and submitting them with a slower/simpler bitrate/modulation is more robust. Cc: stable@vger.kernel.org Fixes: 512b191d9652 ("wcn36xx: Fix TX data path") Signed-off-by: Loic Poulain Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/1634560399-15290-1-git-send-email-loic.poulain@linaro.org --- drivers/net/wireless/ath/wcn36xx/txrx.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/wireless/ath/wcn36xx/txrx.c b/drivers/net/wireless/ath/wcn36xx/txrx.c index cab196b..e2d09d5 100644 --- a/drivers/net/wireless/ath/wcn36xx/txrx.c +++ b/drivers/net/wireless/ath/wcn36xx/txrx.c @@ -429,6 +429,7 @@ static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd, if (ieee80211_is_any_nullfunc(hdr->frame_control)) { /* Don't use a regular queue for null packet (no ampdu) */ bd->queue_id = WCN36XX_TX_U_WQ_ID; + bd->bd_rate = WCN36XX_BD_RATE_CTRL; } if (bcast) { -- 2.7.4