ath10k: strip qos data bit always

NativeWifi tx mode expects QoS Data frames to be
delivered as Data frames with QoS part (e.g. tid)
being delievered out-of-band in fw tx command.

The QoS bit wasn't stripped before submitting to
firmware.

Stripping fixes two known problems:

 * qca6174 IOT with some APs, e.g.
   Cisco AIR-AP 1252 (which would crash after
   ath10k association). Some ath9k APs would
   crash as well.

 * sniffing own tx frames via radiotap because,
   e.g. wireshark was seeing QoS bit set but
   since QoS Control was stripped in ath10k it
   would parse beginning of LLC/SNAP

>From debugability point of view this removes the
ability to distinguish QoS from non-QoS frames
when sniffing own tx via radiotap. On the other
hand frames can be now parsed correctly without
special software modification.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 341f3c8..f386d0b 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -2535,16 +2535,15 @@ static void ath10k_tx_h_nwifi(struct ieee80211_hw *hw, struct sk_buff *skb)
                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.
+       /* Some firmware revisions don't handle sending QoS NullFunc well.
+        * These frames are mainly used for CQM purposes so it doesn't really
+        * matter whether QoS NullFunc or NullFunc are sent.
         */
        hdr = (void *)skb->data;
-       if (ieee80211_is_qos_nullfunc(hdr->frame_control)) {
-               hdr->frame_control &= ~__cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
+       if (ieee80211_is_qos_nullfunc(hdr->frame_control))
                cb->htt.tid = HTT_DATA_TX_EXT_TID_NON_QOS_MCAST_BCAST;
-       }
+
+       hdr->frame_control &= ~__cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 }
 
 static void ath10k_tx_h_add_p2p_noa_ie(struct ath10k *ar,