linux-kernel - Re: [PATCH v3 bpf 2/2] selftests/bpf: test lwt redirect error handling

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Message-ID: <87r0owxh4x.fsf@cloudflare.com>
Date:   Tue, 25 Jul 2023 15:18:58 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     Yan Zhai <yan@...udflare.com>
Cc:     bpf@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Jordan Griege <jgriege@...udflare.com>,
        kernel-team@...udflare.com
Subject: Re: [PATCH v3 bpf 2/2] selftests/bpf: test lwt redirect error handling

On Mon, Jul 24, 2023 at 09:14 PM -07, Yan Zhai wrote:
> Tests BPF redirect at the lwt xmit hook to ensure error handling are
> safe, i.e. won't panic the kernel.
>
> Suggested-by: Alexei Starovoitov <alexei.starovoitov@...il.com>
> Signed-off-by: Yan Zhai <yan@...udflare.com>
> ---
>  tools/testing/selftests/bpf/Makefile          |   1 +
>  .../selftests/bpf/progs/test_lwt_redirect.c   |  67 +++++++
>  .../selftests/bpf/test_lwt_redirect.sh        | 165 ++++++++++++++++++
>  3 files changed, 233 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/progs/test_lwt_redirect.c
>  create mode 100755 tools/testing/selftests/bpf/test_lwt_redirect.sh
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 538df8fb8c42..e3a24d053793 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -66,6 +66,7 @@ TEST_PROGS := test_kmod.sh \
>  	test_xdp_vlan_mode_generic.sh \
>  	test_xdp_vlan_mode_native.sh \
>  	test_lwt_ip_encap.sh \
> +	test_lwt_redirect.sh \
>  	test_tcp_check_syncookie.sh \
>  	test_tc_tunnel.sh \
>  	test_tc_edt.sh \
> diff --git a/tools/testing/selftests/bpf/progs/test_lwt_redirect.c b/tools/testing/selftests/bpf/progs/test_lwt_redirect.c
> new file mode 100644
> index 000000000000..622c6b1e7128
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/test_lwt_redirect.c
> @@ -0,0 +1,67 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <linux/bpf.h>
> +#include <bpf/bpf_helpers.h>
> +
> +#define ETH_LEN 14

Nit: We have ETH_HLEN in bpf_tracing_net.h defined.

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