[PATCH net-next v2 00/12] BIG TCP for UDP tunnels

[Alice Mikityanska <alice.kernel@fastmail.im>]

From: Alice Mikityanska <alice@isovalent.com>

This series is a follow-up to "BIG TCP without HBH in IPv6", and it adds
support for BIG TCP IPv4/IPv6 workloads in vxlan and geneve. Now that
IPv6 BIG TCP doesn't require stripping the HBH in all various
combinations in tunneled traffic, adding BIG TCP becomes feasible.

Patches 01-03 are small fixups to some related code that I'm changing in
the series.

Patch 04 adds accessors for the length field in the UDP header, as
suggested by Paolo in review. The usage of udp_set_len is then added in
the following patches that start using length=0 in BIG TCP UDP packets.

Patches 05-07 close the gaps that prevent BIG TCP packets from going
through UDP tunnel code.

Patch 08 re-adds proper validation of malformed packets that arrive with
length=0 from the wire.

Patch 09 is for proper formatting in tcpdump (set UDP len to 0 rather
than a trimmed value on overflow).

Patches 10-11 bump up tso_max_size for VXLAN and GENEVE.

Patch 12 adds selftests.

Thanks all!

v2 changes: Addressed the review comments: added UDP len helpers,
consolidated UDP len sanity checks in patch 08 into one, added
selftests. Added fixups to related code (patch 01-03).

v1: https://lore.kernel.org/netdev/20250923134742.1399800-1-maxtram95@gmail.com/

Alice Mikityanska (11):
  net/sched: act_csum: don't mangle UDP tunnel GSO packets
  udp: gso: Simplify handling length in GSO_PARTIAL
  geneve: Fix off-by-one comparing with GRO_LEGACY_MAX_SIZE
  net: Use helpers to get/set UDP len tree-wide
  net: Enable BIG TCP with partial GSO
  udp: Support gro_ipv4_max_size > 65536
  udp: Support BIG TCP GSO packets where they can occur
  udp: Validate UDP length in udp_gro_receive
  udp: Set length in UDP header to 0 for big GSO packets
  vxlan: Enable BIG TCP packets
  selftests: net: Add a test for BIG TCP in UDP tunnels

Daniel Borkmann (1):
  geneve: Enable BIG TCP packets

 drivers/infiniband/core/lag.c                 |   2 +-
 drivers/infiniband/sw/rxe/rxe_net.c           |   4 +-
 drivers/net/amt.c                             |   6 +-
 drivers/net/ethernet/intel/i40e/i40e_txrx.c   |   2 +-
 drivers/net/ethernet/intel/iavf/iavf_txrx.c   |   2 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c     |   2 +-
 drivers/net/ethernet/intel/idpf/idpf_txrx.c   |   2 +-
 .../marvell/octeontx2/nic/otx2_txrx.c         |   2 +-
 .../net/ethernet/mellanox/mlx5/core/en_rx.c   |   4 +-
 .../ethernet/mellanox/mlx5/core/en_selftest.c |   2 +-
 drivers/net/ethernet/sfc/falcon/selftest.c    |   4 +-
 drivers/net/ethernet/sfc/selftest.c           |   4 +-
 drivers/net/ethernet/sfc/siena/selftest.c     |   4 +-
 drivers/net/ethernet/sfc/tc_encap_actions.c   |   2 +-
 .../stmicro/stmmac/stmmac_selftests.c         |   4 +-
 drivers/net/geneve.c                          |   6 +-
 drivers/net/netdevsim/dev.c                   |   2 +-
 drivers/net/netdevsim/psample.c               |   2 +-
 drivers/net/netdevsim/psp.c                   |   8 +-
 drivers/net/vxlan/vxlan_core.c                |   2 +
 drivers/net/wireguard/receive.c               |   2 +-
 include/linux/udp.h                           |  16 ++
 include/net/udplite.h                         |   4 +-
 include/trace/events/icmp.h                   |   2 +-
 lib/tests/blackhole_dev_kunit.c               |   2 +-
 net/6lowpan/nhc_udp.c                         |  10 +-
 net/core/netpoll.c                            |   2 +-
 net/core/pktgen.c                             |   4 +-
 net/core/selftests.c                          |   4 +-
 net/core/skbuff.c                             |  10 +-
 net/core/tso.c                                |   3 +-
 net/ipv4/esp4.c                               |   2 +-
 net/ipv4/fou_core.c                           |   2 +-
 net/ipv4/ipconfig.c                           |   6 +-
 net/ipv4/netfilter/nf_nat_snmp_basic_main.c   |   4 +-
 net/ipv4/route.c                              |   2 +-
 net/ipv4/udp.c                                |   8 +-
 net/ipv4/udp_offload.c                        |  58 +++----
 net/ipv4/udp_tunnel_core.c                    |   2 +-
 net/ipv6/esp6.c                               |   5 +-
 net/ipv6/fou6.c                               |   2 +-
 net/ipv6/ip6_udp_tunnel.c                     |   2 +-
 net/ipv6/udp.c                                |   3 +-
 net/ipv6/udp_offload.c                        |   2 +-
 net/l2tp/l2tp_core.c                          |   2 +-
 net/netfilter/ipvs/ip_vs_xmit.c               |   2 +-
 net/netfilter/nf_conntrack_proto_udp.c        |  19 ++-
 net/netfilter/nf_log_syslog.c                 |   2 +-
 net/netfilter/nf_nat_helper.c                 |   2 +-
 net/psp/psp_main.c                            |   2 +-
 net/sched/act_csum.c                          |  12 +-
 net/xfrm/xfrm_nat_keepalive.c                 |   2 +-
 tools/testing/selftests/net/Makefile          |   1 +
 .../testing/selftests/net/big_tcp_tunnels.sh  | 145 ++++++++++++++++++
 54 files changed, 298 insertions(+), 114 deletions(-)
 create mode 100755 tools/testing/selftests/net/big_tcp_tunnels.sh

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2.52.0