netdev - Re: [PATCH bpf-next v3 5/8] selftests: bpf: test bpf_skc_to_mptcp

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Date:   Fri, 6 May 2022 15:26:59 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Mat Martineau <mathew.j.martineau@...ux.intel.com>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Geliang Tang <geliang.tang@...e.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, mptcp@...ts.linux.dev,
        Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: Re: [PATCH bpf-next v3 5/8] selftests: bpf: test bpf_skc_to_mptcp_sock

On Mon, May 2, 2022 at 2:12 PM Mat Martineau
<mathew.j.martineau@...ux.intel.com> wrote:
>
> From: Geliang Tang <geliang.tang@...e.com>
>
> This patch extends the MPTCP test base, to test the new helper
> bpf_skc_to_mptcp_sock().
>
> Define struct mptcp_sock in bpf_tcp_helpers.h, use bpf_skc_to_mptcp_sock
> to get the msk socket in progs/mptcp_sock.c and store the infos in
> socket_storage_map.
>
> Get the infos from socket_storage_map in prog_tests/mptcp.c. Add a new
> function verify_msk() to verify the infos of MPTCP socket, and rename
> verify_sk() to verify_tsk() to verify TCP socket only.
>
> v2: Add CONFIG_MPTCP check for clearer error messages
>
> Acked-by: Matthieu Baerts <matthieu.baerts@...sares.net>
> Signed-off-by: Geliang Tang <geliang.tang@...e.com>
> Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
> ---
>  MAINTAINERS                                   |  1 +
>  .../testing/selftests/bpf/bpf_mptcp_helpers.h | 14 ++++++++
>  .../testing/selftests/bpf/prog_tests/mptcp.c  | 36 +++++++++++++++----
>  .../testing/selftests/bpf/progs/mptcp_sock.c  | 24 ++++++++++---
>  4 files changed, 65 insertions(+), 10 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/bpf_mptcp_helpers.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 359afc617b92..d48d3cb6abbc 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -13780,6 +13780,7 @@ F:      include/net/mptcp.h
>  F:     include/trace/events/mptcp.h
>  F:     include/uapi/linux/mptcp.h
>  F:     net/mptcp/
> +F:     tools/testing/selftests/bpf/bpf_mptcp_helpers.h
>  F:     tools/testing/selftests/bpf/*/*mptcp*.c
>  F:     tools/testing/selftests/net/mptcp/
>
> diff --git a/tools/testing/selftests/bpf/bpf_mptcp_helpers.h b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h
> new file mode 100644
> index 000000000000..18da4cc65e89
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (c) 2022, SUSE. */
> +
> +#ifndef __BPF_MPTCP_HELPERS_H
> +#define __BPF_MPTCP_HELPERS_H
> +
> +#include "bpf_tcp_helpers.h"
> +
> +struct mptcp_sock {
> +       struct inet_connection_sock     sk;
> +
> +} __attribute__((preserve_access_index));

why can't all this live in bpf_tcp_helpers.h? why do we need extra header?

> +
> +#endif
> diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> index cd548bb2828f..4b40bbdaf91f 100644
> --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> @@ -10,14 +10,12 @@ struct mptcp_storage {
>         __u32 is_mptcp;
>  };
>

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