IFCAP_VLAN_HWCSUM
ifp->if_capabilities |= IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM;
if ((mask & IFCAP_VLAN_HWCSUM) != 0 &&
(ifp->if_capabilities & IFCAP_VLAN_HWCSUM) != 0)
ifp->if_capenable ^= IFCAP_VLAN_HWCSUM;
ifp->if_capenable &= ~IFCAP_VLAN_HWCSUM;
ifp->if_capenable &= ~IFCAP_VLAN_HWCSUM;
IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM;
IFCAP_HWCSUM | IFCAP_VLAN_HWCSUM | \
ifp->if_capabilities |= IFCAP_VLAN_HWCSUM;
IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM;
IFCAP_VLAN_HWCSUM;