IEEE80211_AGGR_SETUP
if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
tap->txa_flags |= IEEE80211_AGGR_SETUP;
if (tap->txa_flags & IEEE80211_AGGR_SETUP) {
~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);