openwrt/package/mac80211/patches/526-ath9k_survey_channel_stats.patch

--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -594,6 +594,8 @@ struct ath_softc {
 	struct delayed_work wiphy_work;
 	unsigned long wiphy_scheduler_int;
 	int wiphy_scheduler_index;
+	struct survey_info *cur_survey;
+	struct survey_info survey[ATH9K_NUM_CHANNELS];
 
 	struct tasklet_struct intr_tq;
 	struct tasklet_struct bcon_tasklet;
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -176,6 +176,49 @@ static void ath_start_ani(struct ath_com
 			msecs_to_jiffies((u32)ah->config.ani_poll_interval));
 }
 
+static void ath_update_survey_nf(struct ath_softc *sc, int channel)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath9k_channel *chan = &ah->channels[channel];
+	struct survey_info *survey = &sc->survey[channel];
+
+	if (chan->noisefloor) {
+		survey->filled |= SURVEY_INFO_NOISE_DBM;
+		survey->noise = chan->noisefloor;
+	}
+}
+
+static void ath_update_survey_stats(struct ath_softc *sc)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+	int pos = ah->curchan - &ah->channels[0];
+	struct survey_info *survey = &sc->survey[pos];
+	struct ath_cycle_counters *cc = &common->cc_survey;
+	unsigned long flags;
+	unsigned int div = common->clockrate * 1000;
+
+	spin_lock_irqsave(&common->cc_lock, flags);
+
+	ath_hw_cycle_counters_update(common);
+
+	if (cc->cycles > 0) {
+		survey->filled |= SURVEY_INFO_CHANNEL_TIME |
+			SURVEY_INFO_CHANNEL_TIME_BUSY |
+			SURVEY_INFO_CHANNEL_TIME_RX |
+			SURVEY_INFO_CHANNEL_TIME_TX;
+		survey->channel_time += cc->cycles / div;
+		survey->channel_time_busy += cc->rx_busy / div;
+		survey->channel_time_rx += cc->rx_frame / div;
+		survey->channel_time_tx += cc->tx_frame / div;
+	}
+	memset(cc, 0, sizeof(*cc));
+
+	ath_update_survey_nf(sc, pos);
+
+	spin_unlock_irqrestore(&common->cc_lock, flags);
+}
+
 /*
  * Set/change channels.  If the channel is really being changed, it's done
  * by reseting the chip.  To accomplish this we must first cleanup any pending
@@ -1533,7 +1576,8 @@ static int ath9k_config(struct ieee80211
 {
 	struct ath_wiphy *aphy = hw->priv;
 	struct ath_softc *sc = aphy->sc;
-	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
 	struct ieee80211_conf *conf = &hw->conf;
 	bool disable_radio;
 
@@ -1599,6 +1643,10 @@ static int ath9k_config(struct ieee80211
 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 		struct ieee80211_channel *curchan = hw->conf.channel;
 		int pos = curchan->hw_value;
+		int old_pos = -1;
+
+		if (ah->curchan)
+			old_pos = ah->curchan - &ah->channels[0];
 
 		aphy->chan_idx = pos;
 		aphy->chan_is_ht = conf_is_ht(conf);
@@ -1626,12 +1674,43 @@ static int ath9k_config(struct ieee80211
 
 		ath_update_chainmask(sc, conf_is_ht(conf));
 
+		/* update survey stats for the old channel before switching */
+		ath_update_survey_stats(sc);
+
+		/*
+		 * If the operating channel changes, change the survey in-use flags
+		 * along with it.
+		 * Reset the survey data for the new channel, unless we're switching
+		 * back to the operating channel from an off-channel operation.
+		 */
+		if (!(hw->conf.flags & IEEE80211_CONF_OFFCHANNEL) &&
+		    sc->cur_survey != &sc->survey[pos]) {
+
+			if (sc->cur_survey)
+				sc->cur_survey->filled &= ~SURVEY_INFO_IN_USE;
+
+			sc->cur_survey = &sc->survey[pos];
+
+			memset(sc->cur_survey, 0, sizeof(struct survey_info));
+			sc->cur_survey->filled |= SURVEY_INFO_IN_USE;
+		} else if (!(sc->survey[pos].filled & SURVEY_INFO_IN_USE)) {
+			memset(&sc->survey[pos], 0, sizeof(struct survey_info));
+		}
+
 		if (ath_set_channel(sc, hw, &sc->sc_ah->channels[pos]) < 0) {
 			ath_print(common, ATH_DBG_FATAL,
 				  "Unable to set channel\n");
 			mutex_unlock(&sc->mutex);
 			return -EINVAL;
 		}
+
+		/*
+		 * The most recent snapshot of channel->noisefloor for the old
+		 * channel is only available after the hardware reset. Copy it to
+		 * the survey stats now.
+		 */
+		if (old_pos >= 0)
+			ath_update_survey_nf(sc, old_pos);
 	}
 
 skip_chan_change:
@@ -2001,9 +2080,12 @@ static int ath9k_get_survey(struct ieee8
 {
 	struct ath_wiphy *aphy = hw->priv;
 	struct ath_softc *sc = aphy->sc;
-	struct ath_hw *ah = sc->sc_ah;
 	struct ieee80211_supported_band *sband;
-	struct ath9k_channel *chan;
+	struct ieee80211_channel *chan;
+	int pos;
+
+	if (idx == 0)
+		ath_update_survey_stats(sc);
 
 	sband = hw->wiphy->bands[IEEE80211_BAND_2GHZ];
 	if (sband && idx >= sband->n_channels) {
@@ -2017,17 +2099,10 @@ static int ath9k_get_survey(struct ieee8
 	if (!sband || idx >= sband->n_channels)
 	    return -ENOENT;
 
-	survey->channel = &sband->channels[idx];
-	chan = &ah->channels[survey->channel->hw_value];
-	survey->filled = 0;
-
-	if (chan == ah->curchan)
-		survey->filled |= SURVEY_INFO_IN_USE;
-
-	if (chan->noisefloor) {
-		survey->filled |= SURVEY_INFO_NOISE_DBM;
-		survey->noise = chan->noisefloor;
-	}
+	chan = &sband->channels[idx];
+	pos = chan->hw_value;
+	memcpy(survey, &sc->survey[pos], sizeof(*survey));
+	survey->channel = chan;
 
 	return 0;
 }