From: Michal Kazior Date: Mon, 21 Jul 2014 18:03:10 +0000 (+0300) Subject: ath10k: workaround qos nullfunc bug X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c21c64d145e64d92a6c8f8e13c9b6b5b711832eb;p=linux-beck.git ath10k: workaround qos nullfunc bug Apparently fw/hw generates a corrupted QoS Control Field in Qos NullFunc frames. The only way to workaround this is to downgrade frames to NullFunc. This should be okay since powersave is done by fw/hw and these frames are only used for CQM purposes (e.g. from hostapd to check if station is still connected). This doesn't fix any user visible bug that I know of. It just prevents from sending out funky frames on the air. Reported-by: Janusz Dziedzic Signed-off-by: Michal Kazior Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c index bbce3a0f8a39..3f9afaa93cca 100644 --- a/drivers/net/wireless/ath/ath10k/mac.c +++ b/drivers/net/wireless/ath/ath10k/mac.c @@ -1871,6 +1871,7 @@ static u8 ath10k_tx_h_get_vdev_id(struct ath10k *ar, static void ath10k_tx_h_nwifi(struct ieee80211_hw *hw, struct sk_buff *skb) { struct ieee80211_hdr *hdr = (void *)skb->data; + struct ath10k_skb_cb *cb = ATH10K_SKB_CB(skb); u8 *qos_ctl; if (!ieee80211_is_data_qos(hdr->frame_control)) @@ -1880,6 +1881,16 @@ static void ath10k_tx_h_nwifi(struct ieee80211_hw *hw, struct sk_buff *skb) memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data, (void *)qos_ctl - (void *)skb->data); skb_pull(skb, IEEE80211_QOS_CTL_LEN); + + /* Fw/Hw generates a corrupted QoS Control Field for QoS NullFunc + * frames. Powersave is handled by the fw/hw so QoS NyllFunc frames are + * used only for CQM purposes (e.g. hostapd station keepalive ping) so + * it is safe to downgrade to NullFunc. + */ + if (ieee80211_is_qos_nullfunc(hdr->frame_control)) { + hdr->frame_control &= ~__cpu_to_le16(IEEE80211_STYPE_QOS_DATA); + cb->htt.tid = HTT_DATA_TX_EXT_TID_NON_QOS_MCAST_BCAST; + } } static void ath10k_tx_wep_key_work(struct work_struct *work)