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At the GRO stage, when a valid hint option is found, try match the whole nested headers and try to aggregate on the inner protocol; in case of hdr mismatch extract the nested address and port to properly flush on a per-inner flow basis. On GRO completion, the (unmodified) nested headers will be considered part of the (constant) outer geneve encap header so that plain UDP tunnel segmentation will yield valid wire packets. In the geneve RX path, when processing a GSO packet carrying a GRO hint option, update the nested header length fields from the wire packet size to the GSO-packet one. If the nested header additionally carries a checksum, convert it to CSUM-partial. Finally, when the RX path leverages the GRO hints, skip the additional GRO stage done by GRO cells: otherwise the already set skb->encapsulation flag will foul the GRO cells complete step to use touch the innermost IP header when it should update the nested csum, corrupting the packet. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Link: https://patch.msgid.link/4a9a390588a429191e0ffe48ccdd288bb69e567e.1769011015.git.pabeni@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>