mac80211: set beamforming bit in radiotap

Add a bit in rx_status.vht_flags to let the low level driver
notify mac80211 about a beamformed packet. Propagate this
to the radiotap header.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/mac80211.h

@@ -877,11 +877,13 @@ enum mac80211_rx_flags {
  * @RX_VHT_FLAG_80MHZ: 80 MHz was used
  * @RX_VHT_FLAG_80P80MHZ: 80+80 MHz was used
  * @RX_VHT_FLAG_160MHZ: 160 MHz was used
+ * @RX_VHT_FLAG_BF: packet was beamformed
  */
 enum mac80211_rx_vht_flags {
 	RX_VHT_FLAG_80MHZ		= BIT(0),
 	RX_VHT_FLAG_80P80MHZ		= BIT(1),
 	RX_VHT_FLAG_160MHZ		= BIT(2),
+	RX_VHT_FLAG_BF			= BIT(3),
 };
 
 /**

net/mac80211/rx.c

@@ -333,6 +333,8 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
 		/* in VHT, STBC is binary */
 		if (status->flag & RX_FLAG_STBC_MASK)
 			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
+		if (status->vht_flag & RX_VHT_FLAG_BF)
+			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
 		pos++;
 		/* bandwidth */
 		if (status->vht_flag & RX_VHT_FLAG_80MHZ)