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OVS Kernel testingJoe Stringer, Andy Zhou

{joe,azhou}@ovn.org

OVScon 2015-11-17

Dive in, Try it out!# $EDITOR tests/system-traffic.at

# make check-kernel

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User space unit testing

• Current unit testing framework– Based on AutoTest framework– Currently has ~1718 tests– Good coverage for OVS user space features– Experience of a good test framework• Fast• Repeatable• Easy to write and troubleshoot

OVScon 2015-11-17

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Expanding datapath testing

• Until recently, OVS testing has been userspace-only– Pretend user/kernel datapaths are the same– Rely on out of band datapath testing

• So, we started building out a kernel datapath testsuite– Kernel datapath is getting more complex– Philosophy: Any testing is better than no testing– First major user: Connection tracking

OVScon 2015-11-17

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OVS kernel test topology

OVScon 2015-11-17

Kernel

OVSNetworkNamespace

NetworkNamespace

veth pair

veth pair

Virt

ual M

achi

ne

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Connection Tracking Example

OVScon 2015-11-17

Kernel

OVS + Conntrack

Flows

WgetHTTP/FTP

Client

tests/test-l7.pyHTTP/FTP

Server

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Suggestions? Patches?

Improve testing infrastructure

• Vagrant boxes for testing• Kernel compatibility• Dealing with kernel crashes• Integration with CI tools

Expanding to system tests

• Interactions between features• DPDK datapath testing• Performance testing• Scale testing

OVScon 2015-11-17