I met the following issue when running dpdk-testpmd under the OpenShift
Virtualization environment recently. We did the test on 2 VFs, each passed
through to a VM, and they come from the same PF(XXV710) on the host. However,
it's found there are the following errors when I quit the test on the receiver
side.

# dpdk-testpmd --socket-mem 256 --lcores 0,1 -n 1 -a 00:05:00.0 --proc-type
auto --file-prefix rx -- --forward-mode=rxonly --port-topology=chained
--disable-rss -i --rxq=1 --txq=1 --rxd=256 --txd=256 --nb-cores=1 --auto-start
EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Auto-detected process type: PRIMARY
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rx/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_iavf (8086:154c) device: 0000:05:00.0 (socket -1)
......
iavf_dev_init_vlan(): Failed to update vlan offload
iavf_dev_configure(): configure VLAN failed: -95
iavf_set_rx_function(): request RXDID[1] in Queue[0] is legacy, set
rx_pkt_burst as legacy for all queues
......
testpmd> quit
Telling cores to stop...
Waiting for lcores to finish...

  ---------------------- Forward statistics for port 0  ----------------------
  RX-packets: 158837911      RX-dropped: 0             RX-total: 158837911
  TX-packets: 0              TX-dropped: 0             TX-total: 0
  ----------------------------------------------------------------------------

  +++++++++++++++ Accumulated forward statistics for all ports+++++++++++++++
  RX-packets: 158837911      RX-dropped: 0             RX-total: 158837911
  TX-packets: 0              TX-dropped: 0             TX-total: 0
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Done.

Stopping port 0...
Stopping ports...
iavf_execute_vf_cmd(): Return failure -37 for cmd 9
iavf_disable_queues(): Failed to execute command of OP_DISABLE_QUEUES
iavf_stop_queues(): Fail to stop queues
iavf_stop_queues(): Fail to stop queues
iavf_execute_vf_cmd(): No response for cmd 11
iavf_add_del_all_mac_addr(): fail to execute command OP_DEL_ETHER_ADDRESS
Done

Shutting down port 0...
Closing ports...
Port 0 is closed
Done

Bye...