linux-kernel - Re: [PATCH v6 net-next 3/3] selftests/net/forwarding: configurable seed tests

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Date:   Wed, 28 Apr 2021 14:29:48 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...sch.org>,
        Pavel Balaev <balaevpa@...otecs.ru>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ido Schimmel <idosch@...dia.com>
Subject: Re: [PATCH v6 net-next 3/3] selftests/net/forwarding: configurable
 seed tests

On 4/28/21 10:37 AM, Ido Schimmel wrote:
> On Wed, Apr 28, 2021 at 03:34:55PM +0300, Pavel Balaev wrote:
>> Test equal and different seed values for IPv4/IPv6
>> multipath routing.
> 
> The test does not follow the usual convention of forwarding tests that
> are expected to be run with both veth pairs and loop backed physical
> devices. See: tools/testing/selftests/net/forwarding/README (and
> existing tests for reference)
> 
> This approach allows us to test both the software and hardware data paths.
> 
> You can construct a test where you have multiple VRFs instead of
> multiple namespaces. These VRFs emulate your hosts and routers. Send
> multiple flows from one host and check the distribution across the
> multiple paths connecting your two routers. Change the seed, expect a
> different distribution. Go back to original seed and expect the original
> distribution.
> 

Pavel: I think net-next is closing soon, so this will need to wait until
next cycle (2 weeks from now).

I'll take a look at the patch set in the next few days. You can send
follow up sets as RFCs while net-next is closed, so this will be ready
once it opens.