- if (l3 == RTE_PTYPE_L3_IPV4)
- cksum = ~rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
- else if (l3 == RTE_PTYPE_L3_IPV6)
- cksum = ~rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
- mbuf->ol_flags |= cksum ?
- PKT_RX_L4_CKSUM_BAD :
- PKT_RX_L4_CKSUM_GOOD;
+ if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
+ if (l4 == RTE_PTYPE_L4_UDP) {
+ udp_hdr = (struct rte_udp_hdr *)l4_hdr;
+ if (udp_hdr->dgram_cksum == 0) {
+ /*
+ * For IPv4, a zero UDP checksum
+ * indicates that the sender did not
+ * generate one [RFC 768].
+ */
+ mbuf->ol_flags |= PKT_RX_L4_CKSUM_NONE;
+ return;
+ }
+ }
+ cksum_ok = !rte_ipv4_udptcp_cksum_verify(l3_hdr, l4_hdr);
+ } else { /* l3 == RTE_PTYPE_L3_IPV6, checked above */
+ cksum_ok = !rte_ipv6_udptcp_cksum_verify(l3_hdr, l4_hdr);
+ }
+ mbuf->ol_flags |= cksum_ok ?
+ PKT_RX_L4_CKSUM_GOOD : PKT_RX_L4_CKSUM_BAD;