[ovs-dev] [PATCH] datapath: Add support for lwtunnel

Jesse Gross jesse at nicira.com
Fri Oct 16 23:53:31 UTC 2015

On Fri, Oct 9, 2015 at 3:11 PM, Pravin B Shelar <pshelar at nicira.com> wrote:
> Following patch adds support for lwtunnel to OVS datapath.
> With this change OVS datapath detect lwtunnel support and
> make use of new APIs if available. On older kernel where the
> support is not there the backported tunnel modules are used.
> These backported tunnel devices acts as lwtunnel devices.
> I tried to keep backported module same as upstream for easier
> bug-fix backport. Since STT and LISP are not upstream OVS
> always needs to use respective modules from tunnel compat layer.
> To make it work on kernel 4.3 I have converted STT and LISP
> modules to lwtunnel API model.
> lwtunnel make use of skb-dst to pass tunnel information to the
> tunnel module. On older kernel this is not possible. So the
> metadata ref is stored in OVS_CB. Direct call to tunnel transmit
> function is made by respective tunnel vport modules. Similarly
> on receive side tunnel recv directly call netdev-vport-receive
> to pass the skb to OVS.
> Major backported components include:
> Geneve, GRE, VXLAN, ip_tunnel, udp-tunnels GRO.
> Signed-off-by: Pravin B Shelar <pshelar at nicira.com>

I get tons of sparse warnings with this. Is it possible to somehow
clean them up?

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