[net-next,0/8] udp: GRO L4 improvements

Message

Paolo Abeni March 21, 2021, 5:01 p.m. UTC

This series improves the UDP L4 - either 'forward' or 'frag_list' -
co-existence with UDP tunnel GRO, allowing the first to take place
correctly even for encapsulated UDP traffic.

The first for patches are mostly bugfixes, addressing some GRO 
edge-cases when both tunnels and L4 are present, enabled and in use.

The next 3 patches avoid unneeded segmentation when UDP GRO
traffic traverses in the receive path UDP tunnels.

Finally, some self-tests are included, covering the relevant
GRO scenarios.

Even if most patches are actually bugfixes, this series is
targeting net-next, as overall it makes available a new feature.

Paolo Abeni (8):
  udp: fixup csum for GSO receive slow path
  udp: skip fwd/list GRO for tunnel packets
  udp: properly complete L4 GRO over UDP tunnel packet
  udp: never accept GSO_FRAGLIST packets
  vxlan: allow L4 GRO passthrou
  geneve: allow UDP L4 GRO passthrou
  bareudp: allow UDP L4 GRO passthrou
  selftests: net: add UDP GRO forwarding self-tests

 drivers/net/bareudp.c                     |   1 +
 drivers/net/geneve.c                      |   1 +
 drivers/net/vxlan.c                       |   1 +
 include/linux/udp.h                       |  15 +-
 include/net/udp.h                         |  18 ++
 net/ipv4/udp.c                            |  22 +-
 net/ipv4/udp_offload.c                    |  27 ++-
 net/ipv6/udp.c                            |   5 +
 net/ipv6/udp_offload.c                    |   3 +-
 tools/testing/selftests/net/Makefile      |   1 +
 tools/testing/selftests/net/udpgro_fwd.sh | 251 ++++++++++++++++++++++
 11 files changed, 330 insertions(+), 15 deletions(-)
 create mode 100755 tools/testing/selftests/net/udpgro_fwd.sh