NFE_F_DYN_IM
flags = sc->sc_flags & ~NFE_F_DYN_IM;
if (sc->sc_flags & NFE_F_DYN_IM)
flags |= NFE_F_DYN_IM;
sc->sc_flags |= NFE_F_DYN_IM;
if (sc->sc_flags & NFE_F_DYN_IM) {
(((sc)->sc_flags & NFE_F_DYN_IM) ? NFE_IRQ_NOIMTIMER: NFE_IRQ_IMTIMER))