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Hello,

I try to use af_xdp of DPDK 19.11, but start failed with testpmd. Here is t= he 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=3Dpmd.net.af_xdp:info --no-pci --vdev= net_af_xdp,iface=3Dens12,start_queue=3D0,queue_count=3D3 -- -i --rxq=3D3 -= -txq=3D3
EAL: Det= ected 16 lcore(s)
EAL: Det= ected 1 NUMA nodes
EAL: Mul= ti-process socket /var/run/dpdk/rte/mp_socket
EAL: Sel= ected IOVA mode 'PA'
EAL: No = available hugepages reported in hugepages-1048576kB
EAL: Pro= bing VFIO support...
rte_pmd_= af_xdp_probe(): Initializing pmd_af_xdp for net_af_xdp
init_int= ernals(): Zero copy between umem and mbuf enabled.
Interact= ive-mode selected
testpmd:= create a new mbuf pool <mbuf_pool_socket_0>: n=3D163456, size=3D2176= , socket=3D0
testpmd:= preferred mempool ops selected: ring_mp_mc

Warning!= port-topology=3Dpaired and odd forward ports number, the last port will pa= ir with itself.

Configur= ing Port 0 (socket 0)
eth_rx_q= ueue_setup(): Set up rx queue, rx queue id: 0, xsk queue id: 0
libbpf: = can't get next link: Invalid argument
eth_rx_q= ueue_setup(): Set up rx queue, rx queue id: 1, xsk queue id: 1
libbpf: = can't get next link: Invalid argument
eth_rx_q= ueue_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=A3=BACentos 7.9 + kernel = ;5.4.155-1.el7.elrepo.x86_64


Br,
Christian --_000_8e2fa7daa8de4afea6c35c70caf2801eSY4P282MB27586AD04CD895_--