Hello, I am trying to enable UDP checksum offload with an Intel X550-T2 NIC with DPDK 23.11. The problem is that the rte_eth_tx_burst() fails when I attempt to send an mbuf which is configured for checksum offload.
Here is what i see for this NIC when I run dpdk-devbind.py --status: Network devices using DPDK-compatible driver ============================================ 0000:65:00.1 'Ethernet Controller 10G X550T 1563' drv=vfio-pci unused=uio_pci_generic I have read the following page but it was difficult to tell if anything described there applies in this case. Is what I'm trying to do supported, or not? https://doc.dpdk.org/guides-23.11/nics/ixgbe.html The code was previously working when I was using a software-computed checksum (with rte_ipv4_udptcp_cksum()). Here is the new code I added for offload: // When setting up the port port_conf.txmode.offloads |= RTE_ETH_TX_OFFLOAD_IPV4_CKSUM | RTE_ETH_TX_OFFLOAD_UDP_CKSUM; // When configuring the device if (!(dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_UDP_CKSUM) || !(dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_IPV4_CKSUM)) { rte_panic(" offload not supported"); }else{ std::cout << "offload supported\n"; } // Before copying the payload into the mbuf pkt->ol_flags = RTE_MBUF_F_TX_IPV4 | RTE_MBUF_F_TX_IP_CKSUM | RTE_MBUF_F_TX_UDP_CKSUM; pkt->l2_len = sizeof(struct rte_ether_hdr); pkt->l3_len = sizeof(struct rte_ipv4_hdr); // Right before the tx_burst() call udp_hdr->dgram_cksum = rte_ipv4_phdr_cksum(ip_hdr, pkt->ol_flags); ip_hdr->hdr_checksum = 0; Please let me know if I am doing anything wrong here. Thank you. -Alan
