netdev - Re: 4.19: udpgso_bench_tx: setsockopt zerocopy: Unknown error 524

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Message-ID: <CA+FuTSfBFqRViKfG5crEv8xLMgAkp3cZ+yeuELK5TVv61xT=Yw@mail.gmail.com>
Date:   Tue, 18 Jun 2019 08:31:16 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Fred Klassen <fklassen@...neta.com>
Subject: Re: 4.19: udpgso_bench_tx: setsockopt zerocopy: Unknown error 524

On Tue, Jun 18, 2019 at 7:27 AM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
>
> selftests: net: udpgso_bench.sh failed on 4.19, 4.14, 4.9 and 4.4 branches.
> PASS on stable branch 5.1, mainline and next.
> This failure is started happening on 4.19 and older kernel branches after
> kselftest upgrade to version 5.1

Does version 5.1 here mean running tests from Linux 5.1, against older kernels?

> Is there any possibilities to backport ?
>
> Error:
> udpgso_bench_tx: setsockopt zerocopy: Unknown error 524

MSG_ZEROCOPY for UDP was added in commit b5947e5d1e71 ("udp:
msg_zerocopy") in Linux 5.0.

The selftest was expanded with this feature in commit db63e489c7aa
("selftests: extend zerocopy tests to udp"), also in Linux 5.0.

Those tests are not expected to pass on older kernels.