Hello, I try to use af_xdp of DPDK 19.11, but start failed with testpmd. Here is the log prints, could you please give suggestion for this error ? Thanks in advance! ------ [root@gc bin]$ ./testpmd -l 1,2,3 -n 4 --log-level=pmd.net.af_xdp:info --no-pci --vdev net_af_xdp,iface=ens12,start_queue=0,queue_count=3 -- -i --rxq=3 --txq=3 EAL: Detected 16 lcore(s) EAL: Detected 1 NUMA nodes EAL: Multi-process socket /var/run/dpdk/rte/mp_socket EAL: Selected IOVA mode 'PA' EAL: No available hugepages reported in hugepages-1048576kB EAL: Probing VFIO support... rte_pmd_af_xdp_probe(): Initializing pmd_af_xdp for net_af_xdp init_internals(): Zero copy between umem and mbuf enabled. Interactive-mode selected testpmd: create a new mbuf pool : n=163456, size=2176, socket=0 testpmd: preferred mempool ops selected: ring_mp_mc Warning! port-topology=paired and odd forward ports number, the last port will pair with itself. Configuring Port 0 (socket 0) eth_rx_queue_setup(): Set up rx queue, rx queue id: 0, xsk queue id: 0 libbpf: can't get next link: Invalid argument eth_rx_queue_setup(): Set up rx queue, rx queue id: 1, xsk queue id: 1 libbpf: can't get next link: Invalid argument eth_rx_queue_setup(): Set up rx queue, rx queue id: 2, xsk queue id: 2 libbpf: can't get next link: Invalid argument Port 0: FA:0C:B1:0F:DF:01 ------ My test env: DPDK: stable 19.11.6 libbpf: git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git OS£ºCentos 7.9 + kernel 5.4.155-1.el7.elrepo.x86_64 Br, Christian