VTNET_FLAG_SW_LRO
sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0;
sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO;
sc->vtnet_flags |= VTNET_FLAG_SW_LRO;
sc->vtnet_flags |= VTNET_FLAG_SW_LRO;
return ((sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0);