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

From: Lorenzo Bianconi <[email-masked]>
Date: Tue, 4 Nov 2025 12:08:06 +0100

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

Hi Pablo and Florian,

Do you have any updates/comments about this series? Thanks in advance.

Regards,
Lorenzo

> 
> ---
> 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/[email-masked]
> 
> 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/[email-masked]
> 
> Changes in v6:
> - Rebase on top of nf-next main branch
> - Link to v5: https://lore.kernel.org/r/[email-masked]
> 
> 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/[email-masked]
> 
> 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/[email-masked]
> 
> 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/[email-masked]
> 
> Changes in v2:
> - Introduce IPIP flowtable selftest
> - Link to v1: https://lore.kernel.org/r/[email-masked]
> 
> ---
> 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 <[email-masked]>
>