[dpdk-dev] [PATCH v5 2/2] gro: add VXLAN UDP GRO support

[Stephen Hemminger]

On Wed, 16 Sep 2020 11:05:38 +0800 (CST)
yang_y_yi  <yang_y_yi at 163.com> wrote:

> No, next_proto_id of inner IP header can clearly identify it is a UDP packet even if it is a no-udp-header ip fragment.

Yes GRO will know its UDP, but it will have no port information (in this packet).
GRO can only safely combine packets from the same flow. Since there is no port in
this packet, it is not sufficient to identify the inner flow.