linux-kernel - [PATCH bpf-next,v3 0/2] Clarify and Enhance XDP Rx Metadata Handling

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Message-Id: <20250702165757.3278625-1-yoong.siang.song@intel.com>
Date: Thu,  3 Jul 2025 00:57:55 +0800
From: Song Yoong Siang <yoong.siang.song@...el.com>
To: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	KP Singh <kpsingh@...nel.org>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Mykola Lysenko <mykolal@...com>,
	Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH bpf-next,v3 0/2] Clarify and Enhance XDP Rx Metadata Handling

This patch set improves the documentation and selftests for XDP Rx metadata
handling. The first patch clarifies the documentation around XDP metadata
layout and METADATA_SIZE. The second patch enhances the BPF selftests to
make XDP metadata handling more robust across different NICs.

Prior to this patch set, the XDP program might accidentally overwrite the
device-reserved metadata.

V3:
  - update doc and commit msg accordingly.

V2: https://lore.kernel.org/netdev/20250702030349.3275368-1-yoong.siang.song@intel.com/
  - unconditionally do bpf_xdp_adjust_meta with -XDP_METADATA_SIZE (Stanislav)

V1: https://lore.kernel.org/netdev/20250701042940.3272325-1-yoong.siang.song@intel.com/

Song Yoong Siang (2):
  doc: enhance explanation of XDP Rx metadata layout and METADATA_SIZE
  selftests/bpf: Enhance XDP Rx metadata handling

 Documentation/networking/xdp-rx-metadata.rst  | 36 +++++++++++++++----
 .../selftests/bpf/prog_tests/xdp_metadata.c   |  2 +-
 .../selftests/bpf/progs/xdp_hw_metadata.c     |  2 +-
 .../selftests/bpf/progs/xdp_metadata.c        |  2 +-
 tools/testing/selftests/bpf/xdp_hw_metadata.c |  2 +-
 tools/testing/selftests/bpf/xdp_metadata.h    |  7 ++++
 6 files changed, 41 insertions(+), 10 deletions(-)

-- 
2.34.1