IFCAP_TSO4
#define CXGB_CAP_ENABLE (IFCAP_HWCSUM | IFCAP_TSO4)
ifp->if_capabilities &= ~(IFCAP_TSO4 | IFCAP_TSO6);
ifp->if_capenable &= ~(IFCAP_TSO4 | IFCAP_TSO6);