- struct ether_hdr *peth = (struct ether_hdr *)rte_pktmbuf_prepend(mbuf, sizeof(struct mpls_hdr));
- l2_len += sizeof(struct mpls_hdr);
- prox_ip_cksum(mbuf, (struct ipv4_hdr *)((uint8_t *)peth + l2_len), l2_len, sizeof(struct ipv4_hdr), task->offload_crc);