ieee80211_add_edca_params
frm = ieee80211_add_edca_params(frm, ic);
frm = ieee80211_add_edca_params(frm, ic);
frm = ieee80211_add_edca_params(frm, ic);
extern u_int8_t *ieee80211_add_edca_params(u_int8_t *, struct ieee80211com *);