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

[Johannes Berg <johannes@sipsolutions.net>]

> +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