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

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Message-ID: <aGakv3SCbr3mAzcA@mini-arch>
Date: Thu, 3 Jul 2025 08:41:51 -0700
From: Stanislav Fomichev <stfomichev@...il.com>
To: Song Yoong Siang <yoong.siang.song@...el.com>
Cc: "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>, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next,v3 0/2] Clarify and Enhance XDP Rx Metadata
 Handling

On 07/03, Song Yoong Siang wrote:
> 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/

Acked-by: Stanislav Fomichev <sdf@...ichev.me>