ifc_oqdrops
data->ifi_oqdrops = ifp->if_data_counters[ifc_oqdrops];
data->ifi_oqdrops += counters[ifc_oqdrops];
counters_inc(ifp->if_counters, ifc_oqdrops);
#define if_oqdrops if_data_counters[ifc_oqdrops]
counters_add(sc->sc_if.if_counters, ifc_oqdrops, dropped);
counters_inc(ifp->if_counters, ifc_oqdrops);