Merge branch 'udp-gro'
Paolo Abeni says: ==================== udp: implement GRO support This series implements GRO support for UDP sockets, as the RX counterpart of commit bec1f6f6 ("udp: generate gso with UDP_SEGMENT"). The core functionality is implemented by the second patch, introducing a new sockopt to enable UDP_GRO, while patch 3 implements support for passing the segment size to the user space via a new cmsg. UDP GRO performs a socket lookup for each ingress packets and aggregate datagram directed to UDP GRO enabled sockets with constant l4 tuple. UDP GRO packets can land on non GRO-enabled sockets, e.g. due to iptables NAT rules, and that could potentially confuse existing applications. The solution adopted here is to de-segment the GRO packet before enqueuing as needed. Since we must cope with packet reinsertion after de-segmentation, the relevant code is factored-out in ipv4 and ipv6 specific helpers and exposed to UDP usage. While the current code can probably be improved, this safeguard ,implemented in the patches 4-7, allows future enachements to enable UDP GSO offload on more virtual devices eventually even on forwarded packets. The last 4 for patches implement some performance and functional self-tests, re-using the existing udpgso infrastructure. The problematic scenario described above is explicitly tested. This revision of the series try to address the feedback provided by Willem and Subash on previous iteration. ==================== Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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