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From: Cong Wang <xiyou.wangcong@gmail.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
	Cong Wang <cong.wang@bytedance.com>,
	John Fastabend <john.fastabend@gmail.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jakub Sitnicki <jakub@cloudflare.com>,
	Lorenz Bauer <lmb@cloudflare.com>
Subject: Re: [PATCH bpf-next v5 11/11] selftests/bpf: add test cases for redirection between udp and unix
Date: Thu, 5 Aug 2021 19:34:04 -0700	[thread overview]
Message-ID: <CAM_iQpWo7DU+LEVG42bWmxhWY-z9m3mx3=TWvUu6v7DgFN2OoA@mail.gmail.com> (raw)
In-Reply-To: <CAEf4BzaccTCGeONN4MB5iRBZfmzfS3rR0R6XEPVmUKukrLSJ3w@mail.gmail.com>

On Thu, Aug 5, 2021 at 3:43 PM Andrii Nakryiko
<andrii.nakryiko@gmail.com> wrote:
>
> On Sun, Jul 4, 2021 at 12:05 PM Cong Wang <xiyou.wangcong@gmail.com> wrote:
> >
> > From: Cong Wang <cong.wang@bytedance.com>
> >
> > Add two test cases to ensure redirection between udp and unix
> > work bidirectionally.
> >
> > Cc: John Fastabend <john.fastabend@gmail.com>
> > Cc: Daniel Borkmann <daniel@iogearbox.net>
> > Cc: Jakub Sitnicki <jakub@cloudflare.com>
> > Cc: Lorenz Bauer <lmb@cloudflare.com>
> > Signed-off-by: Cong Wang <cong.wang@bytedance.com>
> > ---
> >  .../selftests/bpf/prog_tests/sockmap_listen.c | 170 ++++++++++++++++++
> >  1 file changed, 170 insertions(+)
> >
>
> [...]
>
> > +       n = write(c1, "a", 1);
> > +       if (n < 0)
> > +               FAIL_ERRNO("%s: write", log_prefix);
> > +       if (n == 0)
> > +               FAIL("%s: incomplete write", log_prefix);
> > +       if (n < 1)
> > +               goto close;
> > +
> > +       key = SK_PASS;
> > +       err = xbpf_map_lookup_elem(verd_mapfd, &key, &pass);
> > +       if (err)
> > +               goto close;
> > +       if (pass != 1)
> > +               FAIL("%s: want pass count 1, have %d", log_prefix, pass);
> > +
> > +       n = read(mode == REDIR_INGRESS ? p0 : c0, &b, 1);
> > +       if (n < 0)
> > +               FAIL_ERRNO("%s: read", log_prefix);
>
> Hey Cong,
>
> This test is pretty flaky and quite frequently fails in our CIs (e.g., [0]):
>
> ./test_progs-no_alu32:unix_udp_redir_to_connected:1949: egress: read:
> Resource temporarily unavailable
>   unix_udp_redir_to_connected:FAIL:1949
>
> Please send a fix to make it more reliable. Thanks!

Using an unbound number of retries makes this reliable, but you
dislike it. ;) But, there must be some reason for the delay of
packet delivery, I guess it might be related to workqueue scheduling,
let me check it tomorrow.

Thanks.

  reply	other threads:[~2021-08-06  2:34 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-04 19:02 [PATCH bpf-next v5 00/11] sockmap: add sockmap support for unix datagram socket Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 01/11] sock_map: relax config dependency to CONFIG_NET Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 02/11] sock_map: lift socket state restriction for datagram sockets Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 03/11] af_unix: implement ->read_sock() for sockmap Cong Wang
2021-07-12 17:04   ` John Fastabend
2021-07-04 19:02 ` [PATCH bpf-next v5 04/11] af_unix: set TCP_ESTABLISHED for datagram sockets too Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 05/11] af_unix: add a dummy ->close() for sockmap Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 06/11] af_unix: implement ->psock_update_sk_prot() Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 07/11] af_unix: implement unix_dgram_bpf_recvmsg() Cong Wang
2021-07-18 17:49   ` Eric Dumazet
2021-07-20  0:03     ` Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 08/11] selftests/bpf: factor out udp_socketpair() Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 09/11] selftests/bpf: factor out add_to_sockmap() Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 10/11] selftests/bpf: add a test case for unix sockmap Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 11/11] selftests/bpf: add test cases for redirection between udp and unix Cong Wang
2021-08-05 22:43   ` Andrii Nakryiko
2021-08-06  2:34     ` Cong Wang [this message]
2021-07-12 17:02 ` [PATCH bpf-next v5 00/11] sockmap: add sockmap support for unix datagram socket John Fastabend
2021-07-16  1:31   ` Alexei Starovoitov

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