On Tue, Apr 17, 2018 at 8:43 PM, Dimitris Michailidis
[off-list ref] wrote:

On Tue, Apr 17, 2018 at 1:00 PM, Willem de Bruijn
[off-list ref] wrote:

quoted

From: Willem de Bruijn <willemb@google.com>

Virtual devices such as tunnels and bonding can handle large packets.
Only segment packets when reaching a physical or loopback device.

Signed-off-by: Willem de Bruijn <willemb@google.com>
---
 include/linux/netdev_features.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index 35b79f47a13d..1e4883bb02a7 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h

@@ -80,6 +80,7 @@ enum {

        NETIF_F_GRO_HW_BIT,             /* Hardware Generic receive offload */
        NETIF_F_HW_TLS_RECORD_BIT,      /* Offload TLS record */
+       NETIF_F_GSO_UDP_L4_BIT,         /* UDP payload GSO (not UFO) */

Please add an entry for the new flag to
net/core/ethtool.c:netdev_features_strings
and a description to Documentation/networking/netdev-features.txt.

Will do. I initially wrote this as a transparent kernel-internal feature,
but indeed it should be observable and configurable.