netdev - Re: [PATCH bpf-next v2 10/15] selftests/bpf: Dump skb metadata on verification failure

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Message-ID: <7956ac25-f0ba-4d29-a07f-d1eaafb84acc@linux.dev>
Date: Wed, 22 Oct 2025 16:30:09 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Jakub Sitnicki <jakub@...udflare.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>,
 Daniel Borkmann <daniel@...earbox.net>,
 John Fastabend <john.fastabend@...il.com>,
 Stanislav Fomichev <sdf@...ichev.me>, Alexei Starovoitov <ast@...nel.org>,
 Andrii Nakryiko <andrii@...nel.org>, 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>, Arthur Fabre <arthur@...hurfabre.com>,
 bpf@...r.kernel.org, netdev@...r.kernel.org, kernel-team@...udflare.com
Subject: Re: [PATCH bpf-next v2 10/15] selftests/bpf: Dump skb metadata on
 verification failure

On 10/19/25 5:45 AM, Jakub Sitnicki wrote:
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c
> index 93a1fbe6a4fd..a3de37942fa4 100644
> --- a/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c
> @@ -171,6 +171,25 @@ static int write_test_packet(int tap_fd)
>   	return 0;
>   }
>   
> +enum {
> +	BPF_STDOUT = 1,
> +	BPF_STDERR = 2,

There is BPF_STREAM_STDERR in uapi/bpf.h
> diff --git a/tools/testing/selftests/bpf/progs/test_xdp_meta.c b/tools/testing/selftests/bpf/progs/test_xdp_meta.c
> index 11288b20f56c..33480bcb8ec1 100644
> --- a/tools/testing/selftests/bpf/progs/test_xdp_meta.c
> +++ b/tools/testing/selftests/bpf/progs/test_xdp_meta.c
> @@ -18,6 +18,11 @@
>    * TC program then verifies if the passed metadata is correct.
>    */
>   
> +enum {
> +	BPF_STDOUT = 1,
> +	BPF_STDERR = 2,
> +};
> +