ath9k: Set RX filter based to allow broadcast Action frame RX

Advertise support for multicast frame registration and update the RX
filter based on the recently added FIF_MCAST_ACTION to allow broadcast
Action frames to be received. This is needed for Device Provisioning
Protocol (DPP) use cases that use broadcast Public Action frames.
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200426084733.7889-1-jouni@codeaurora.org

drivers/net/wireless/ath/ath9k/init.c

@@ -1012,6 +1012,8 @@ static void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
 
 	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
 	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_AIRTIME_FAIRNESS);
+	wiphy_ext_feature_set(hw->wiphy,
+			      NL80211_EXT_FEATURE_MULTICAST_REGISTRATIONS);
 }
 
 int ath9k_init_device(u16 devid, struct ath_softc *sc,

drivers/net/wireless/ath/ath9k/main.c

@@ -1476,6 +1476,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 	FIF_OTHER_BSS |				\
 	FIF_BCN_PRBRESP_PROMISC |		\
 	FIF_PROBE_REQ |				\
+	FIF_MCAST_ACTION |			\
 	FIF_FCSFAIL)
 
 /* FIXME: sc->sc_full_reset ? */

drivers/net/wireless/ath/ath9k/recv.c

@@ -413,7 +413,8 @@ u32 ath_calcrxfilter(struct ath_softc *sc)
 	if (sc->cur_chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
 		rfilt |= ATH9K_RX_FILTER_COMP_BAR;
 
-	if (sc->cur_chan->nvifs > 1 || (sc->cur_chan->rxfilter & FIF_OTHER_BSS)) {
+	if (sc->cur_chan->nvifs > 1 ||
+	    (sc->cur_chan->rxfilter & (FIF_OTHER_BSS | FIF_MCAST_ACTION))) {
 		/* This is needed for older chips */
 		if (sc->sc_ah->hw_version.macVersion <= AR_SREV_VERSION_9160)
 			rfilt |= ATH9K_RX_FILTER_PROM;