[PATCH nf-next v8 0/3] Add IPIP flowtable SW acceleration

[Lorenzo Bianconi <lorenzo@kernel.org>]

Introduce SW acceleration for IPIP tunnels in the netfilter flowtable
infrastructure. This series introduces basic infrastructure to
accelerate other tunnel types (e.g. IP6IP6).

---
Changes in v8:
- Rebase on top of the following series (not yet applied)
  https://patchwork.ozlabs.org/project/netfilter-devel/list/?series=477081
- Link to v7: https://lore.kernel.org/r/20251021-nf-flowtable-ipip-v7-0-a45214896106@kernel.org

Changes in v7:
- Introduce sw acceleration for tx path of IPIP tunnels
- Rely on exact match during flowtable entry lookup
- Fix typos
- Link to v6: https://lore.kernel.org/r/20250818-nf-flowtable-ipip-v6-0-eda90442739c@kernel.org

Changes in v6:
- Rebase on top of nf-next main branch
- Link to v5: https://lore.kernel.org/r/20250721-nf-flowtable-ipip-v5-0-0865af9e58c6@kernel.org

Changes in v5:
- Rely on __ipv4_addr_hash() to compute the hash used as encap ID
- Remove unnecessary pskb_may_pull() in nf_flow_tuple_encap()
- Add nf_flow_ip4_ecanp_pop utility routine
- Link to v4: https://lore.kernel.org/r/20250718-nf-flowtable-ipip-v4-0-f8bb1c18b986@kernel.org

Changes in v4:
- Use the hash value of the saddr, daddr and protocol of outer IP header as
  encapsulation id.
- Link to v3: https://lore.kernel.org/r/20250703-nf-flowtable-ipip-v3-0-880afd319b9f@kernel.org

Changes in v3:
- Add outer IP header sanity checks
- target nf-next tree instead of net-next
- Link to v2: https://lore.kernel.org/r/20250627-nf-flowtable-ipip-v2-0-c713003ce75b@kernel.org

Changes in v2:
- Introduce IPIP flowtable selftest
- Link to v1: https://lore.kernel.org/r/20250623-nf-flowtable-ipip-v1-1-2853596e3941@kernel.org

---
Lorenzo Bianconi (3):
      net: netfilter: Add IPIP flowtable rx sw acceleration
      net: netfilter: Add IPIP flowtable tx sw acceleration
      selftests: netfilter: nft_flowtable.sh: Add IPIP flowtable selftest

 include/linux/netdevice.h                          |  16 +++
 include/net/netfilter/nf_flow_table.h              |  22 ++++
 net/ipv4/ipip.c                                    |  29 +++++
 net/netfilter/nf_flow_table_core.c                 |   3 +
 net/netfilter/nf_flow_table_ip.c                   | 117 ++++++++++++++++++++-
 net/netfilter/nf_flow_table_path.c                 |  86 +++++++++++++--
 .../selftests/net/netfilter/nft_flowtable.sh       |  40 +++++++
 7 files changed, 298 insertions(+), 15 deletions(-)
---
base-commit: 32e4b1bf1bbfe63e52e2fff7ade0aaeb805defe3
change-id: 20250623-nf-flowtable-ipip-1b3d7b08d067

Best regards,
-- 
Lorenzo Bianconi <lorenzo@kernel.org>