ath9k: Add CTWindow support

Since CTWindow can be used for improving discoverability,
fill this field in the NoA Attribute properly.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index c690601..b4ac51e 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -572,6 +572,8 @@ void ath9k_release_buffered_frames(struct ieee80211_hw *hw,
 /* VIFs */
 /********/
 
+#define P2P_DEFAULT_CTWIN 10
+
 struct ath_vif {
        struct list_head list;
 

diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c
index 7a6ca44..e73d305 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/channel.c
+++ b/drivers/net/wireless/ath/ath9k/channel.c
@@ -1166,6 +1166,30 @@ static void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif)
        ath9k_update_p2p_ps_timer(sc, avp);
 }
 
+static u8 ath9k_get_ctwin(struct ath_softc *sc, struct ath_vif *avp)
+{
+       struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
+       u8 switch_time, ctwin;
+
+       /*
+        * Channel switch in multi-channel mode is deferred
+        * by a quarter beacon interval when handling
+        * ATH_CHANCTX_EVENT_BEACON_PREPARE, so the P2P-GO
+        * interface is guaranteed to be discoverable
+        * for that duration after a TBTT.
+        */
+       switch_time = cur_conf->beacon_interval / 4;
+
+       ctwin = avp->vif->bss_conf.p2p_noa_attr.oppps_ctwindow;
+       if (ctwin && (ctwin < switch_time))
+               return ctwin;
+
+       if (switch_time < P2P_DEFAULT_CTWIN)
+               return 0;
+
+       return P2P_DEFAULT_CTWIN;
+}
+
 void ath9k_beacon_add_noa(struct ath_softc *sc, struct ath_vif *avp,
                          struct sk_buff *skb)
 {
@@ -1198,6 +1222,8 @@ void ath9k_beacon_add_noa(struct ath_softc *sc, struct ath_vif *avp,
        memset(noa, 0, noa_len);
 
        noa->index = avp->noa_index;
+       noa->oppps_ctwindow = ath9k_get_ctwin(sc, avp);
+
        if (avp->periodic_noa_duration) {
                u32 interval = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
 

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index ca10a8b..1950c04 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -763,8 +763,9 @@ static void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
        if (AR_SREV_9160_10_OR_LATER(sc->sc_ah) || ath9k_modparam_nohwcrypt)
                hw->flags |= IEEE80211_HW_MFP_CAPABLE;
 
-       hw->wiphy->features |= (NL80211_FEATURE_ACTIVE_MONITOR |
-                               NL80211_FEATURE_AP_MODE_CHAN_WIDTH_CHANGE);
+       hw->wiphy->features |= NL80211_FEATURE_ACTIVE_MONITOR |
+                              NL80211_FEATURE_AP_MODE_CHAN_WIDTH_CHANGE |
+                              NL80211_FEATURE_P2P_GO_CTWIN;
 
        if (!config_enabled(CONFIG_ATH9K_TX99)) {
                hw->wiphy->interface_modes =