netdev - Re: [PATCH bpf-next v3 4/8] selftests: bpf: add MPTCP test base

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Date:   Fri, 6 May 2022 15:24:31 -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>,
        Nicolas Rybowski <nicolas.rybowski@...sares.net>,
        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>,
        Geliang Tang <geliang.tang@...e.com>
Subject: Re: [PATCH bpf-next v3 4/8] selftests: bpf: add MPTCP test base

On Mon, May 2, 2022 at 2:12 PM Mat Martineau
<mathew.j.martineau@...ux.intel.com> wrote:
>
> From: Nicolas Rybowski <nicolas.rybowski@...sares.net>
>
> This patch adds a base for MPTCP specific tests.
>
> It is currently limited to the is_mptcp field in case of plain TCP
> connection because there is no easy way to get the subflow sk from a msk
> in userspace. This implies that we cannot lookup the sk_storage attached
> to the subflow sk in the sockops program.
>
> Acked-by: Matthieu Baerts <matthieu.baerts@...sares.net>
> Co-developed-by: Geliang Tang <geliang.tang@...e.com>
> Signed-off-by: Geliang Tang <geliang.tang@...e.com>
> Signed-off-by: Nicolas Rybowski <nicolas.rybowski@...sares.net>
> Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
> ---
>  MAINTAINERS                                   |   1 +
>  tools/testing/selftests/bpf/config            |   1 +
>  tools/testing/selftests/bpf/network_helpers.c |  43 ++++--
>  tools/testing/selftests/bpf/network_helpers.h |   4 +
>  .../testing/selftests/bpf/prog_tests/mptcp.c  | 136 ++++++++++++++++++
>  .../testing/selftests/bpf/progs/mptcp_sock.c  |  50 +++++++
>  6 files changed, 227 insertions(+), 8 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/mptcp.c
>  create mode 100644 tools/testing/selftests/bpf/progs/mptcp_sock.c
>

[...]

>  /* ipv4 test vector */
> @@ -42,11 +43,14 @@ extern struct ipv6_packet pkt_v6;
>  int settimeo(int fd, int timeout_ms);
>  int start_server(int family, int type, const char *addr, __u16 port,
>                  int timeout_ms);
> +int start_mptcp_server(int family, const char *addr, __u16 port,
> +                      int timeout_ms);
>  int *start_reuseport_server(int family, int type, const char *addr_str,
>                             __u16 port, int timeout_ms,
>                             unsigned int nr_listens);
>  void free_fds(int *fds, unsigned int nr_close_fds);
>  int connect_to_fd(int server_fd, int timeout_ms);
> +int connect_to_mptcp_fd(int server_fd, int timeout_ms);
>  int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts);
>  int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms);
>  int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
> diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> new file mode 100644
> index 000000000000..cd548bb2828f
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> @@ -0,0 +1,136 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2020, Tessares SA. */

2022?

> +
> +#include <test_progs.h>
> +#include "cgroup_helpers.h"
> +#include "network_helpers.h"
> +
> +struct mptcp_storage {
> +       __u32 invoked;
> +       __u32 is_mptcp;
> +};
> +
> +static int verify_sk(int map_fd, int client_fd, const char *msg, __u32 is_mptcp)
> +{
> +       int err = 0, cfd = client_fd;
> +       struct mptcp_storage val;
> +
> +       if (is_mptcp == 1)
> +               return 0;
> +
> +       if (CHECK_FAIL(bpf_map_lookup_elem(map_fd, &cfd, &val) < 0)) {

don't use CHECK and especially CHECK_FAIL, please use ASSERT_xxx()
macros instead

> +               perror("Failed to read socket storage");
> +               return -1;
> +       }
> +

[...]

> diff --git a/tools/testing/selftests/bpf/progs/mptcp_sock.c b/tools/testing/selftests/bpf/progs/mptcp_sock.c
> new file mode 100644
> index 000000000000..0d65fb889d03
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/mptcp_sock.c
> @@ -0,0 +1,50 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2020, Tessares SA. */
> +
> +#include <linux/bpf.h>
> +#include <bpf/bpf_helpers.h>
> +
> +char _license[] SEC("license") = "GPL";
> +__u32 _version SEC("version") = 1;

version is not needed, please drop

> +
> +struct mptcp_storage {
> +       __u32 invoked;
> +       __u32 is_mptcp;
> +};

[...]