IEEE80211_RADIOTAP_F_DATAPAD
sc->sc_hwmap[i].txflags = IEEE80211_RADIOTAP_F_DATAPAD;
tap->wr_flags |= IEEE80211_RADIOTAP_F_DATAPAD;
tap->wt_flags |= IEEE80211_RADIOTAP_F_DATAPAD;
tap->wr_flags |= IEEE80211_RADIOTAP_F_DATAPAD;
tap->wt_flags |= IEEE80211_RADIOTAP_F_DATAPAD;