openwrt/package/mac80211/patches/523-minstrel_ht_optimize.patch

--- a/net/mac80211/rc80211_minstrel_ht.h
+++ b/net/mac80211/rc80211_minstrel_ht.h
@@ -70,6 +70,8 @@ struct minstrel_mcs_group_data {
 };
 
 struct minstrel_ht_sta {
+	struct ieee80211_tx_rate tx_rates[3];
+
 	/* ampdu length (average, per sampling interval) */
 	unsigned int ampdu_len;
 	unsigned int ampdu_packets;
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -87,6 +87,10 @@ const struct mcs_group minstrel_mcs_grou
 
 static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES];
 
+static void
+minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
+                     struct ieee80211_tx_rate *rate, int index,
+                     bool sample, bool rtscts);
 /*
  * Perform EWMA (Exponentially Weighted Moving Average) calculation
  */
@@ -174,6 +178,17 @@ minstrel_ht_calc_tp(struct minstrel_priv
 	mr->cur_tp = MINSTREL_TRUNC((1000000 / usecs) * mr->probability);
 }
 
+static void
+minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
+{
+	minstrel_ht_set_rate(mp, mi, &mi->tx_rates[0], mi->max_tp_rate,
+			     false, false);
+	minstrel_ht_set_rate(mp, mi, &mi->tx_rates[1], mi->max_tp_rate2,
+			     false, true);
+	minstrel_ht_set_rate(mp, mi, &mi->tx_rates[2], mi->max_prob_rate,
+			     false, true);
+}
+
 /*
  * Update rate statistics and select new primary rates
  *
@@ -294,6 +309,7 @@ minstrel_ht_update_stats(struct minstrel
 		}
 	}
 
+	minstrel_ht_update_rates(mp, mi);
 	mi->stats_update = jiffies;
 }
 
@@ -332,8 +348,8 @@ minstrel_next_sample_idx(struct minstrel
 }
 
 static void
-minstrel_downgrade_rate(struct minstrel_ht_sta *mi, unsigned int *idx,
-			bool primary)
+minstrel_downgrade_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
+			unsigned int *idx, bool primary)
 {
 	int group, orig_group;
 
@@ -352,6 +368,7 @@ minstrel_downgrade_rate(struct minstrel_
 			*idx = mi->groups[group].max_tp_rate;
 		else
 			*idx = mi->groups[group].max_tp_rate2;
+		minstrel_ht_update_rates(mp, mi);
 		break;
 	}
 }
@@ -452,13 +469,13 @@ minstrel_ht_tx_status(void *priv, struct
 	if (rate->attempts > 30 &&
 	    MINSTREL_FRAC(rate->success, rate->attempts) <
 	    MINSTREL_FRAC(20, 100))
-		minstrel_downgrade_rate(mi, &mi->max_tp_rate, true);
+		minstrel_downgrade_rate(mp, mi, &mi->max_tp_rate, true);
 
 	rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate2);
 	if (rate2->attempts > 30 &&
 	    MINSTREL_FRAC(rate2->success, rate2->attempts) <
 	    MINSTREL_FRAC(20, 100))
-		minstrel_downgrade_rate(mi, &mi->max_tp_rate2, false);
+		minstrel_downgrade_rate(mp, mi, &mi->max_tp_rate2, false);
 
 	if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) {
 		minstrel_ht_update_stats(mp, mi);
@@ -523,7 +540,6 @@ minstrel_calc_retransmit(struct minstrel
 static void
 minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
                      struct ieee80211_tx_rate *rate, int index,
-                     struct ieee80211_tx_rate_control *txrc,
                      bool sample, bool rtscts)
 {
 	const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
@@ -611,6 +627,7 @@ minstrel_ht_get_rate(void *priv, struct 
 	struct minstrel_priv *mp = priv;
 	int sample_idx;
 	bool sample = false;
+	int last = 0;
 
 	if (rate_control_send_low(sta, priv_sta, txrc))
 		return;
@@ -636,11 +653,10 @@ minstrel_ht_get_rate(void *priv, struct 
 	if (sample_idx >= 0) {
 		sample = true;
 		minstrel_ht_set_rate(mp, mi, &ar[0], sample_idx,
-			txrc, true, false);
+			true, false);
 		info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
 	} else {
-		minstrel_ht_set_rate(mp, mi, &ar[0], mi->max_tp_rate,
-			txrc, false, false);
+		ar[0] = mi->tx_rates[0];
 	}
 
 	if (mp->hw->max_rates >= 3) {
@@ -650,33 +666,27 @@ minstrel_ht_get_rate(void *priv, struct 
 		 * max_tp_rate -> max_tp_rate2 -> max_prob_rate by default.
 		 */
 		if (sample_idx >= 0)
-			minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate,
-				txrc, false, false);
+			ar[1] = mi->tx_rates[0];
 		else
-			minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate2,
-				txrc, false, true);
-
-		minstrel_ht_set_rate(mp, mi, &ar[2], mi->max_prob_rate,
-				     txrc, false, !sample);
+			ar[1] = mi->tx_rates[1];
 
-		ar[3].count = 0;
-		ar[3].idx = -1;
+		ar[2] = mi->tx_rates[2];
+		last = 3;
 	} else if (mp->hw->max_rates == 2) {
 		/*
 		 * Only 2 tx rates supported, use
 		 * sample_rate -> max_prob_rate for sampling and
 		 * max_tp_rate -> max_prob_rate by default.
 		 */
-		minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_prob_rate,
-				     txrc, false, !sample);
-
-		ar[2].count = 0;
-		ar[2].idx = -1;
+		ar[1] = mi->tx_rates[2];
+		last = 2;
 	} else {
 		/* Not using MRR, only use the first rate */
-		ar[1].count = 0;
-		ar[1].idx = -1;
+		last = 1;
+
 	}
+	ar[last].count = 0;
+	ar[last].idx = -1;
 
 	mi->total_packets++;
 
@@ -768,6 +778,7 @@ minstrel_ht_update_caps(void *priv, stru
 	if (!n_supported)
 		goto use_legacy;
 
+	minstrel_ht_update_rates(mp, mi);
 	return;
 
 use_legacy: