Re: [PATCH net-next] geneve: always fill CSUM6_RX configuration

On Sat, May 20, 2017 at 6:35 AM, Eric Garver [off-list ref] wrote:

On Fri, May 19, 2017 at 06:57:46PM -0700, Pravin Shelar wrote:

quoted

On Thu, May 18, 2017 at 12:59 PM, Eric Garver [off-list ref] wrote:

quoted

CSMU6_RX is relevant for collect_metadata as well. As such leave it
outside of the dev's IPv4/IPv6 checks.

Can you explain it bit? is this flag used with ipv4 tunnels?

It's used with collect_metadata as both ipv4 and ipv6 sockets will be
created.

openvswitch recently gained support for creating tunnels with rtnetlink.
It sets COLLECT_METADATA and CSUM6_RX. After create, it does a get to
verify the device got created with all the requested configuration. The
verify was failing due to CSUM6_RX not being returned.

Since ip_tunnel_info_af() defaults to returning AF_INET, we fall into
the IPv4 case and CSUM6_RX is never returned. Other relevant areas that
call ip_tunnel_info_af() do so using the info from the skb, not the
geneve_dev.

ok.
I think ip_tunnel_info_af() check is not right. it does not work in
case of collect_metadata.
Better fix would be check for genene->sock4 and genene->sock6 and
build the netlink skb accordingly.