| From: |
| Lorenzo Bianconi <lorenzo-AT-kernel.org> |
| To: |
| Donald Hunter <donald.hunter-AT-gmail.com>, Jakub Kicinski <kuba-AT-kernel.org>, "David S. Miller" <davem-AT-davemloft.net>, Eric Dumazet <edumazet-AT-google.com>, Paolo Abeni <pabeni-AT-redhat.com>, Simon Horman <horms-AT-kernel.org>, Alexei Starovoitov <ast-AT-kernel.org>, Daniel Borkmann <daniel-AT-iogearbox.net>, Jesper Dangaard Brouer <hawk-AT-kernel.org>, John Fastabend <john.fastabend-AT-gmail.com>, Stanislav Fomichev <sdf-AT-fomichev.me>, Andrew Lunn <andrew+netdev-AT-lunn.ch>, Tony Nguyen <anthony.l.nguyen-AT-intel.com>, Przemek Kitszel <przemyslaw.kitszel-AT-intel.com>, Alexander Lobakin <aleksander.lobakin-AT-intel.com>, Andrii Nakryiko <andrii-AT-kernel.org>, Martin KaFai Lau <martin.lau-AT-linux.dev>, Eduard Zingerman <eddyz87-AT-gmail.com>, Song Liu <song-AT-kernel.org>, Yonghong Song <yonghong.song-AT-linux.dev>, KP Singh <kpsingh-AT-kernel.org>, Hao Luo <haoluo-AT-google.com>, Jiri Olsa <jolsa-AT-kernel.org>, Shuah Khan <shuah-AT-kernel.org>, Maciej Fijalkowski <maciej.fijalkowski-AT-intel.com> |
| Subject: |
| [PATCH bpf-next v3 0/5] Add the the capability to load HW RX checsum in eBPF programs |
| Date: |
| Tue, 17 Feb 2026 09:33:55 +0100 |
| Message-ID: |
| <20260217-bpf-xdp-meta-rxcksum-v3-0-30024c50ba71@kernel.org> |
| Cc: |
| Jakub Sitnicki <jakub-AT-cloudflare.com>, netdev-AT-vger.kernel.org, bpf-AT-vger.kernel.org, intel-wired-lan-AT-lists.osuosl.org, linux-kselftest-AT-vger.kernel.org, Lorenzo Bianconi <lorenzo-AT-kernel.org>, Aleksandr Loktionov <aleksandr.loktionov-AT-intel.com> |
| Archive-link: |
| Article |
Introduce bpf_xdp_metadata_rx_checksum() kfunc in order to load the HW
RX cheksum results in the eBPF program binded to the NIC.
Implement xmo_rx_checksum callback for veth and ice drivers.
If the hardware detects a wrong/failed checksum, it will report
CHECKSUM_NONE in the packet metadata. Moreover, CHECKSUM_NONE will be
returned even if the NIC can't parse the packet (e.g. if it does not
support a specific protocol). A possible use case for
bpf_xdp_metadata_rx_checksum() would be to implement a XDP DDoS
application [1] combining the info from bpf_xdp_metadata_rx_checksum()
and bpf_xdp_metadata_rx_hash() kfuncs in order to filter packets with a
wrong/failed checksum.
[1] https://blog.cloudflare.com/unimog-cloudflares-edge-load-...
---
Changes in v3:
- Remoe leftover assignment from v2 in veth_xdp_rx_checksum()
- Fix typos
- Fix commit logs
- Link to v2: https://lore.kernel.org/r/20260213-bpf-xdp-meta-rxcksum-v...
Changes in v2:
- Remove XDP_CHECKSUM_PARTIAL definition
- Improve veth_xdp_rx_checksum() callback
- Fix uninitialized case for cksum_meta in ice_get_rx_csum()
- Fix sparse warnings in ice driver
- Fix typos
- Link to v1: https://lore.kernel.org/r/20260210-bpf-xdp-meta-rxcksum-v...
Changes in v1:
- Rebase on top of bpf-next
- Test ice driver using xdp_hw_metadata tool available in the bpf
kernel selftest
- Improve cover letter with an use-case for
bpf_xdp_metadata_rx_checksum()
- Link to RFC v2: https://lore.kernel.org/r/20250925-bpf-xdp-meta-rxcksum-v...
Changes in RFC v2:
- Squash patch 1/6 and 2/6
- Introduce enum xdp_checksum definitions
- Rework ice support to reuse ice_rx_csum codebase
---
Lorenzo Bianconi (5):
netlink: specs: Add XDP RX checksum capability to XDP metadata specs
net: veth: Add xmo_rx_checksum callback to veth driver
net: ice: Add xmo_rx_checksum callback
selftests/bpf: Add selftest support for bpf_xdp_metadata_rx_checksum
selftests/bpf: Add bpf_xdp_metadata_rx_checksum support to xdp_hw_metadat prog
Documentation/netlink/specs/netdev.yaml | 5 +
drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 118 +++++++++++++--------
drivers/net/veth.c | 29 +++++
include/net/xdp.h | 13 +++
include/uapi/linux/netdev.h | 3 +
net/core/xdp.c | 28 +++++
tools/include/uapi/linux/netdev.h | 3 +
.../selftests/bpf/prog_tests/xdp_metadata.c | 6 ++
.../testing/selftests/bpf/progs/xdp_hw_metadata.c | 8 ++
tools/testing/selftests/bpf/progs/xdp_metadata.c | 3 +
tools/testing/selftests/bpf/xdp_hw_metadata.c | 25 +++++
tools/testing/selftests/bpf/xdp_metadata.h | 12 +++
12 files changed, 211 insertions(+), 42 deletions(-)
---
base-commit: 192c0159402e6bfbe13de6f8379546943297783d
change-id: 20250925-bpf-xdp-meta-rxcksum-900685e2909d
Best regards,
--
Lorenzo Bianconi <lorenzo@kernel.org>
