+static inline void
+update_pkt_header(struct rte_mbuf *pkt, uint32_t total_pkt_len)
+{
+ struct rte_ipv4_hdr *ip_hdr;
+ struct rte_udp_hdr *udp_hdr;
+ uint16_t pkt_data_len;
+ uint16_t pkt_len;
+
+ pkt_data_len = (uint16_t) (total_pkt_len - (
+ sizeof(struct rte_ether_hdr) +
+ sizeof(struct rte_ipv4_hdr) +
+ sizeof(struct rte_udp_hdr)));
+ /* updata udp pkt length */
+ udp_hdr = rte_pktmbuf_mtod_offset(pkt, struct rte_udp_hdr *,
+ sizeof(struct rte_ether_hdr) +
+ sizeof(struct rte_ipv4_hdr));
+ pkt_len = (uint16_t) (pkt_data_len + sizeof(struct rte_udp_hdr));
+ udp_hdr->dgram_len = RTE_CPU_TO_BE_16(pkt_len);
+
+ /* updata ip pkt length and csum */
+ ip_hdr = rte_pktmbuf_mtod_offset(pkt, struct rte_ipv4_hdr *,
+ sizeof(struct rte_ether_hdr));
+ ip_hdr->hdr_checksum = 0;
+ pkt_len = (uint16_t) (pkt_len + sizeof(struct rte_ipv4_hdr));
+ ip_hdr->total_length = RTE_CPU_TO_BE_16(pkt_len);
+ ip_hdr->hdr_checksum = rte_ipv4_cksum(ip_hdr);
+}
+