linux-kernel - Re: [PATCH bpf-next v6 2/2] selftests: bpf: test BPF_PROG

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Date:   Thu, 20 Jan 2022 21:36:02 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Di Zhu <zhudi2@...wei.com>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Jakub Sitnicki <jakub@...udflare.com>,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        luzhihao@...wei.com, rose.chen@...wei.com
Subject: Re: [PATCH bpf-next v6 2/2] selftests: bpf: test BPF_PROG_QUERY for
 progs attached to sockmap

On Tue, Jan 18, 2022 at 5:40 PM Di Zhu <zhudi2@...wei.com> wrote:
>
> Add test for querying progs attached to sockmap. we use an existing
> libbpf query interface to query prog cnt before and after progs
> attaching to sockmap and check whether the queried prog id is right.
>
> Signed-off-by: Di Zhu <zhudi2@...wei.com>
> Acked-by: Yonghong Song <yhs@...com>
> ---
>  .../selftests/bpf/prog_tests/sockmap_basic.c  | 66 +++++++++++++++++++
>  .../bpf/progs/test_sockmap_progs_query.c      | 24 +++++++
>  2 files changed, 90 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_progs_query.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> index 85db0f4cdd95..1ab57cdc4ae4 100644
> --- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> +++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> @@ -8,6 +8,7 @@
>  #include "test_sockmap_update.skel.h"
>  #include "test_sockmap_invalid_update.skel.h"
>  #include "test_sockmap_skb_verdict_attach.skel.h"
> +#include "test_sockmap_progs_query.skel.h"
>  #include "bpf_iter_sockmap.skel.h"
>
>  #define TCP_REPAIR             19      /* TCP sock is under repair right now */
> @@ -315,6 +316,63 @@ static void test_sockmap_skb_verdict_attach(enum bpf_attach_type first,
>         test_sockmap_skb_verdict_attach__destroy(skel);
>  }
>
> +static __u32 query_prog_id(int prog_fd)
> +{
> +       struct bpf_prog_info info = {};
> +       __u32 info_len = sizeof(info);
> +       int err;
> +
> +       err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
> +       if (!ASSERT_OK(err, "bpf_obj_get_info_by_fd") ||
> +           !ASSERT_EQ(info_len, sizeof(info), "bpf_obj_get_info_by_fd"))
> +               return 0;
> +
> +       return info.id;
> +}
> +
> +static void test_sockmap_progs_query(enum bpf_attach_type attach_type)
> +{
> +       struct test_sockmap_progs_query *skel;
> +       int err, map_fd, verdict_fd, duration = 0;

The 'duration' is unused.
You should have seen a warning while compiling the selftests?

Anyway. I've fixed it while applying.