netdev - Re: [PATCH v3 net-next 2/2] bpf: selftests: add bind retry for post

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Date:   Wed, 5 Jan 2022 22:45:48 +0800
From:   Menglong Dong <menglong8.dong@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        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>, netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Menglong Dong <imagedong@...cent.com>
Subject: Re: [PATCH v3 net-next 2/2] bpf: selftests: add bind retry for
 post_bind{4, 6}

On Wed, Jan 5, 2022 at 9:57 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Wed, Jan 5, 2022 at 5:21 AM <menglong8.dong@...il.com> wrote:
> >
> > From: Menglong Dong <imagedong@...cent.com>
> >
> > With previous patch, kernel is able to 'put_port' after sys_bind()
> > fails. Add the test for that case: rebind another port after
> > sys_bind() fails. If the bind success, it means previous bind
> > operation is already undoed.
> >
> > Signed-off-by: Menglong Dong <imagedong@...cent.com>
> > ---
> >  tools/testing/selftests/bpf/test_sock.c | 166 +++++++++++++++++++++---
> >  1 file changed, 146 insertions(+), 20 deletions(-)
> >
> > diff --git a/tools/testing/selftests/bpf/test_sock.c b/tools/testing/selftests/bpf/test_sock.c
> > index e8edd3dd3ec2..68525d68d4e5 100644
> > --- a/tools/testing/selftests/bpf/test_sock.c
> > +++ b/tools/testing/selftests/bpf/test_sock.c
> > @@ -35,12 +35,15 @@ struct sock_test {
> >         /* Endpoint to bind() to */
> >         const char *ip;
> >         unsigned short port;
> > +       unsigned short port_retry;
> >         /* Expected test result */
> >         enum {
> >                 LOAD_REJECT,
> >                 ATTACH_REJECT,
> >                 BIND_REJECT,
> >                 SUCCESS,
> > +               RETRY_SUCCESS,
> > +               RETRY_REJECT
> >         } result;
> >  };
> >
> > @@ -60,6 +63,7 @@ static struct sock_test tests[] = {
> >                 0,
> >                 NULL,
> >                 0,
> > +               0,
> >                 LOAD_REJECT,
> >         },
>
>
> I assume we tried C99 initializers here, and this failed for some reason ?
>

Yeah, C99 initializers should be a good choice here, therefore
I don't need to change every entry here after I add a new field to
'struct sock_test'.

I think C99 initializers should work here, I'll give it a try.

Thanks!
Menglong Dong

> diff --git a/tools/testing/selftests/bpf/test_sock.c
> b/tools/testing/selftests/bpf/test_sock.c
> index e8edd3dd3ec2..b57ce9f3eabf 100644
> --- a/tools/testing/selftests/bpf/test_sock.c
> +++ b/tools/testing/selftests/bpf/test_sock.c
> @@ -54,13 +54,13 @@ static struct sock_test tests[] = {
>                         BPF_MOV64_IMM(BPF_REG_0, 1),
>                         BPF_EXIT_INSN(),
>                 },
> -               BPF_CGROUP_INET4_POST_BIND,
> -               BPF_CGROUP_INET4_POST_BIND,
> -               0,
> -               0,
> -               NULL,
> -               0,
> -               LOAD_REJECT,
> +               .expected_attach_type = BPF_CGROUP_INET4_POST_BIND,
> +               .attach_type = BPF_CGROUP_INET4_POST_BIND,
> +               .domain = 0,
> +               .type = 0,
> +               .ip = NULL,
> +               .port = 0,
> +               .result = LOAD_REJECT,
>         },
>         {
>                 "bind4 load with invalid access: mark",