IP1_NXT_PROT_UDP_CHKSUM_WIDTH_MASK
IP1_NXT_PROT_UDP_CHKSUM_WIDTH_MASK);
#define IP1_NXT_PROT_UDP_CHKSUM_WIDTH(x) (((x) << 4) & IP1_NXT_PROT_UDP_CHKSUM_WIDTH_MASK)