rps: support IPIP encapsulation

Skip IPIP header to get proper layer-4 information.

Like GRE tunnels, this only works if rxhash is not already provided by
the device itself (ethtool -K ethX rxhash off), to allow kernel compute
a software rxhash.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index a4306f7e4d09..b668a3d9a189 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2608,6 +2608,8 @@ again:
                         }
                 }
                 break;
+        case IPPROTO_IPIP:
+                goto again;
         default:
                 break;
         }