Those subprocess calls do indeed add up to be expensive quite quickly,
and when I think of it it may actually not be a consistent way of
determining if a interface belongs to Open vSwitch in all its
configurations. Open vSwitch supports multiple datapath types, and
depending on which one you use the interface may or may not be owned by
the openvswitch driver.
However, this brings me to something we might use as a consistent cross-
distro way of determining whether Open vSwitch is there and has bridges
configured.
When Open vSwitch registers a datapath it also creates a virtual port
for it, and we could possibly look for that to determine whether Open
vSwitch is installed and actually has useful configuration.
The 'system' datapath is the kernel datapath as provided by the
openvswitch kernel module, the 'netdev' datapath is used for alternative
datapaths such as the Open vSwitch userspace implementation, DPDK,
AF_XDP etc.
Example:
# ovs-vsctl show
5ef28194-7376-40f6-9306-1a21b0624079
Bridge br1
datapath_type: system
Port br1
Interface br1
type: internal
Bridge br0
datapath_type: netdev
Port br0
Interface br0
type: internal
ovs_version: "2.13.1"
# ls -l /sys/class/net/ovs-*
lrwxrwxrwx 1 root root 0 Feb 4 05:33 /sys/class/net/ovs-netdev ->
../../devices/virtual/net/ovs-netdev
lrwxrwxrwx 1 root root 0 Feb 4 06:06 /sys/class/net/ovs-system ->
../../devices/virtual/net/ovs-system
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https://bugs.launchpad.net/bugs/1912844
Title:
Bond with OVS bridging RuntimeError: duplicate mac found!
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