mac80211: rate control status only for controlled packets

This patch changes mac80211 to not notify the rate control algorithm's
tx_status() method when reporting status for a packet that didn't go
through the rate control algorithm's get_rate() method.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/net/mac80211.h

@@ -245,6 +245,9 @@ struct ieee80211_bss_conf {
  * @IEEE80211_TX_CTL_RATE_CTRL_PROBE: internal to mac80211, can be
  *	set by rate control algorithms to indicate probe rate, will
  *	be cleared for fragmented frames (except on the last fragment)
+ * @IEEE80211_TX_INTFL_RCALGO: mac80211 internal flag, do not test or
+ *	set this flag in the driver; indicates that the rate control
+ *	algorithm was used and should be notified of TX status
  */
 enum mac80211_tx_control_flags {
 	IEEE80211_TX_CTL_REQ_TX_STATUS		= BIT(0),
@@ -260,6 +263,7 @@ enum mac80211_tx_control_flags {
 	IEEE80211_TX_STAT_AMPDU			= BIT(10),
 	IEEE80211_TX_STAT_AMPDU_NO_BACK		= BIT(11),
 	IEEE80211_TX_CTL_RATE_CTRL_PROBE	= BIT(12),
+	IEEE80211_TX_INTFL_RCALGO		= BIT(13),
 };
 
 /**

net/mac80211/rate.c

@@ -219,10 +219,12 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
 		info->control.rates[i].count = 1;
 	}
 
-	if (sta && sdata->force_unicast_rateidx > -1)
+	if (sta && sdata->force_unicast_rateidx > -1) {
 		info->control.rates[0].idx = sdata->force_unicast_rateidx;
-	else
+	} else {
 		ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
+		info->flags |= IEEE80211_TX_INTFL_RCALGO;
+	}
 
 	/*
 	 * try to enforce the maximum rate the user wanted

net/mac80211/rate.h

@@ -44,8 +44,10 @@ static inline void rate_control_tx_status(struct ieee80211_local *local,
 	struct rate_control_ref *ref = local->rate_ctrl;
 	struct ieee80211_sta *ista = &sta->sta;
 	void *priv_sta = sta->rate_ctrl_priv;
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 
-	ref->ops->tx_status(ref->priv, sband, ista, priv_sta, skb);
+	if (likely(info->flags & IEEE80211_TX_INTFL_RCALGO))
+		ref->ops->tx_status(ref->priv, sband, ista, priv_sta, skb);
 }