XNF_CAP_SG
if (sc->sc_caps & XNF_CAP_SG) {
sc->sc_caps |= XNF_CAP_SG;
if (sc->sc_caps & XNF_CAP_SG)
sc->sc_tx_frags = sc->sc_caps & XNF_CAP_SG ? XNF_TX_FRAG : 1;