[Bug 1912847] Re: ovs-vswitchd should consider lack of DPDK support fatal

[Drew Freiberger]

Here's a reproducer:

juju deploy ubuntu # onto a vm or metal, can't repro with lxd
juju ssh ubuntu/0 sudo apt-get install openvswitch-switch -y
juju ssh ubuntu/0 'sudo ovs-vsctl add-br br0; sudo ovs-vsctl add-port br0 dpdk-p0 -- set Interface dpdk-p0 type=dpdk options:dpdk-devargs=0000:01:00.0'

Error output from the add-port command is:

ovs-vsctl: Error detected while setting up 'dpdk-p0': could not open network device dpdk-p0 (Address family not supported by protocol).  See ovs-vswitchd log for details.
ovs-vsctl: The default log directory is "/var/log/openvswitch".


You can then query 'ovs-vsctl show' and see:

    Bridge br0
        Port dpdk-p0
            Interface dpdk-p0
                type: dpdk
                options: {dpdk-devargs="0000:01:00.0"}
                error: "could not open network device dpdk-p0 (Address family not supported by protocol)"
        Port br0
            Interface br0
                type: internal


ovs-vsctl -f csv list Interface | grep 'not supported'

provides a response that could also be alerted on as an active
configuration issue rather than alerting on presence of the log entry.

$ sudo ovs-vsctl -f csv list Interface |grep 'not supported'
556792cf-733a-48fd-aeb1-9423c68e354e,[],{},{},[],[],[],[],[],[],[],[],"""could not open network device dpdk-p0 (Address family not supported by protocol)""",{},[],0,0,[],[],[],[],{},[],[],[],[],dpdk-p0,-1,[],"{dpdk-devargs=""0000:01:00.0""}",{},{},{},dpdk


** Also affects: charm-neutron-openvswitch
   Importance: Undecided
       Status: New

** Also affects: charm-neutron-gateway
   Importance: Undecided
       Status: New

** Also affects: charm-ovn-chassis
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1912847

Title:
  ovs-vswitchd should consider lack of DPDK support fatal

Status in OpenStack neutron-gateway charm:
  New
Status in OpenStack neutron-openvswitch charm:
  New
Status in charm-ovn-chassis:
  New
Status in openvswitch package in Ubuntu:
  New

Bug description:
  If ovs-vswitchd without DPDK support is run on a system which requires
  it, the following error is logged:

  2021-01-14T06:01:54.608Z|00007|dpdk|ERR|DPDK not supported in this
  copy of Open vSwitch.

  Unfortunately this is not a fatal error and ovs-vswitchd continues on.
  It would be much easier from a monitoring and operator ease-of-
  diagnosis perspective, if ovs-vswitchd exited after this error
  message.

  (ovs-vswitchd was running without DPDK support due to LP #1836713)

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