ILL_CAPAB_ZEROCOPY
ill->ill_capabilities &= ~(ILL_CAPAB_HCKSUM | ILL_CAPAB_ZEROCOPY);
if (ill->ill_capabilities & ILL_CAPAB_ZEROCOPY) {
ill->ill_capabilities |= ILL_CAPAB_ZEROCOPY;
if (!(ill->ill_capabilities & ILL_CAPAB_ZEROCOPY))
(((ill)->ill_capabilities & ILL_CAPAB_ZEROCOPY) != 0)