On Wed, Jun 1, 2016 at 11:24 PM, Simon Horman
<simon.hor...@netronome.com> wrote:
> * Set skb protocol based on contents of packet. I have observed this is
> necessary to get actual protocol of a packet when it is injected into an
> internal device e.g. by libnet in which case skb protocol will be set to
> ETH_ALL.
>
> * Set the mac_len which has been observed to not be set up correctly when
> an ARP packet is generated and sent via an openvswitch bridge.
> My test case is a scenario where there are two open vswtich bridges.
> One outputs to a tunnel port which egresses on the other.
>
> The motivation for this is that support for outputting to layer 3 (non-tap)
> GRE tunnels as implemented by a subsequent patch depends on protocol and
> mac_len being set correctly on receive.
>
> Signed-off-by: Simon Horman <simon.hor...@netronome.com>
>
> ---
> v10
> * Set mac_len
>
> v9
> * New patch
> ---
> net/openvswitch/vport-internal_dev.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/net/openvswitch/vport-internal_dev.c
> b/net/openvswitch/vport-internal_dev.c
> index 2ee48e447b72..f89b1efa88f1 100644
> --- a/net/openvswitch/vport-internal_dev.c
> +++ b/net/openvswitch/vport-internal_dev.c
> @@ -48,6 +48,10 @@ static int internal_dev_xmit(struct sk_buff *skb, struct
> net_device *netdev)
> {
> int len, err;
>
> + skb->protocol = eth_type_trans(skb, netdev);
> + skb_push(skb, ETH_HLEN);
> + skb_reset_mac_len(skb);
> +
resetting mac-len breaks the assumption about mac_len for referencing
MPLS header ref: skb_mpls_header().
