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Chapter 10. Receiving the Could not open network device dpdk0 (No such device) in ovs-vsctl show message

10.1. Symptom
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You receive the Could not open network device dpdk0 (No such device) in ovs-vsctl show message.

10.2. Diagnosis
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Red Hat supports a subset of the Poll Mode Drivers (PMDs) listed in DPDK Supported Hardware. Red Hat disabled unsupported PMDs in August of 2017.

Upstream PMDs might have security or performance issues. Therefore, a PMD needs to go through significant testing to pass Red Hat’s qualification tests.

You can see a list of all enabled PMDs in /usr/share/doc/openvswitch-<version>/README.DPDK-PMDS. This list might contain PMDs not supported by Red Hat. Poll Mode Drivers not listed in README.DPDK-PMDS are not supported.

10.3. Solution
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The following example shows the supported PMDs for openvswitch-2.6.1: 

[root@overcloud-compute-0 ~]# cat /usr/share/doc/openvswitch-2.6.1/README.DPDK-PMDS
DPDK drivers included in this package:

E1000
ENIC
I40E
IXGBE
RING
VIRTIO

For more information about the drivers, see
http://dpdk.org/doc/guides-16.11/nics/index.html
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This example shows the supported PMDs for openvswitch-2.9.0: 

[root@undercloud-r430 ~]# cat /usr/share/doc/openvswitch-2.9.0/README.DPDK-PMDS
DPDK drivers included in this package:

BNXT
E1000
ENIC
FAILSAFE
I40E
IXGBE
MLX4
MLX4_GLUE
MLX5
MLX5_GLUE
NFP
RING
SOFTNIC
VIRTIO

For more information about the drivers, see
http://dpdk.org/doc/guides-17.11/nics/index.html
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