if_gethwtsomaxsegsize
sc->hn_saved_tsosegsz = if_gethwtsomaxsegsize(ifp);
if (if_gethwtsomaxsegsize(ifp) > if_gethwtsomaxsegsize(vf_ifp))
if_sethwtsomaxsegsize(ifp, if_gethwtsomaxsegsize(vf_ifp));
tsomaxsegsz = if_gethwtsomaxsegsize(sc->hn_ifp);
if_gethwtsomaxsegcount(ifp), if_gethwtsomaxsegsize(ifp));
u_int if_gethwtsomaxsegsize(const if_t ifp);