Re: [PATCH 4/4] mac80211: Implement functionality to monitor txrate cross event for a station

+static void ieee80211_sta_mon_txrate_thold_check(struct sta_info *sta)
+{
+	struct rate_info rinfo;
+	enum nl80211_sta_mon_txrate_threshold_event sta_txrate_event;
+	int txrate;
+
+	if (!sta->txrate_high)
+		return;
+
+	sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
+	txrate = cfg80211_calculate_bitrate(&rinfo);

These are quite expensive calculations, I think this is far too much to
do on every packet.

You need to find a way to do most of the calculations at configure time,
e.g. build a table of MCS configurations this station might use, and
mark bits in there that fall above/below the threshold, or something
like that?

johannes