Re: [PATCH net 2/7] selftests: openvswitch: add config file

[Aaron Conole <aconole@redhat.com>]

Hi Matthieu,

"Matthieu Baerts (NGI0)" <matttbe@kernel.org> writes:

> The kselftests doc mentions that a config file should be present "if a
> test needs specific kernel config options enabled". This selftest
> requires some kernel config, but no config file was provided.
>
> We could say that a sub-target could use the parent's config file, but
> the kselftests doc doesn't mention anything about that. Plus the
> net/openvswitch target is the only net target without a config file.

We've been operating on that assumption from the openvswitch side, but
it's true that isn't explicitly documented anywhere, and I guess it
isn't officially supported in the kselftest framework.  I guess we'll
need to keep updating this config as we add tests for things like SCTP,
and others, and maybe that's a good thing like we can add a comment
describing which tests take which configs.

The downside is for most of the OVS testing we use the NIPA scripts
and those 'inherit' the parent config, so it would be a change on our
side from the development standpoint (but probably something we should
have been doing from the beginning).

That said, would it be worth also exploring the 'cascading
configuration' support?  It seems like a useful feature, but maybe it
should be a separate discussion.  I ask because of how OVS interacts
with the networking stack as an 'alternative bridge' so-to-speak, I do
worry about having to duplicate lots of configurations between the two
as we expand the test coverage on OVS side.

> Here is a new config file, which is a trimmed version of the net one,
> with hopefully the minimal required kconfig on top of 'make defconfig'.

Should this also remove the OVS configs from the upper level since there
shouldn't be OVS tests executing there (ie: CONFIG_OPENVSWITCH*)?

> The Fixes tag points to the introduction of the net/openvswitch target,
> just to help validating this target on stable kernels.
>
> Fixes: 25f16c873fb1 ("selftests: add openvswitch selftest suite")
> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
> ---
> To: Aaron Conole <aconole@redhat.com>
> To: Eelco Chaudron <echaudro@redhat.com>
> To: Ilya Maximets <i.maximets@ovn.org>
> Cc: dev@openvswitch.org
> ---
>  tools/testing/selftests/net/openvswitch/config | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/tools/testing/selftests/net/openvswitch/config b/tools/testing/selftests/net/openvswitch/config
> new file mode 100644
> index 000000000000..c659749cd086
> --- /dev/null
> +++ b/tools/testing/selftests/net/openvswitch/config
> @@ -0,0 +1,16 @@
> +CONFIG_GENEVE=m
> +CONFIG_INET_DIAG=y
> +CONFIG_IPV6=y
> +CONFIG_NETFILTER=y
> +CONFIG_NET_IPGRE=m
> +CONFIG_NET_IPGRE_DEMUX=m
> +CONFIG_NF_CONNTRACK=m
> +CONFIG_NF_CONNTRACK_OVS=y
> +CONFIG_OPENVSWITCH=m
> +CONFIG_OPENVSWITCH_GENEVE=m
> +CONFIG_OPENVSWITCH_GRE=m
> +CONFIG_OPENVSWITCH_VXLAN=m
> +CONFIG_PSAMPLE=m
> +CONFIG_VETH=y
> +CONFIG_VLAN_8021Q=y
> +CONFIG_VXLAN=m