TULIP_SP_FIELD_C
*sp++ = htole32(TULIP_SP_FIELD_C(0xff, 0xff));
*sp++ = htole32(TULIP_SP_FIELD_C(0xff, 0xff));
*sp++ = htole32(TULIP_SP_FIELD_C(0xff, 0xff));
*sp++ = htole32(TULIP_SP_FIELD_C(0xff, 0xff));
*sp++ = htole32(TULIP_SP_FIELD_C(0xff, 0xff));
*sp++ = htole32(TULIP_SP_FIELD_C(0xff, 0xff));
#define TULIP_SP_FIELD(x, f) TULIP_SP_FIELD_C((x)[f * 2], (x)[f * 2 + 1])