netdev - Re: net: dsa: lantiq_gswip: getting the first selftests to pass

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Message-ID: <20220728000230.kfwd5rkn433f2ecf@skbuf>
Date:   Thu, 28 Jul 2022 03:02:30 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        netdev@...r.kernel.org, andrew@...n.ch, vivien.didelot@...il.com,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Aleksander Jan Bajkowski <olek2@...pl>
Subject: Re: net: dsa: lantiq_gswip: getting the first selftests to pass

On Wed, Jul 27, 2022 at 02:07:51PM -0700, Florian Fainelli wrote:
> Since I am in the process of re-designing my test rack at home with
> DSA devices, how do you run the selftests out of curiosity? Is there a
> nice diagram that explains how to get a physical connection set-up?
> 
> I used to have between 2 and 4 Ethernet controllers dedicated to each
> port of the switch of the DUT so I could run
> bridge/standalone/bandwidth testing but I feel like this is a tad
> extreme and am cutting down on the number of Ethernet ports so I can
> put NVMe drives in the machine instead.

tools/testing/selftests/net/forwarding/README

                             br0
                              +
               vrf-h1         |           vrf-h2
                 +        +---+----+        +
                 |        |        |        |
    192.0.2.1/24 +        +        +        + 192.0.2.2/24
               swp1     swp2     swp3     swp4
                 +        +        +        +
                 |        |        |        |
                 +--------+        +--------+

Most of the tests assume these 4 ports, otherwise the topology is
mentioned in a drawing for that particular selftest.

The names used by the tests are actually $h1 and $h2 for the host ports
(extreme left and extreme right) - these terminate traffic - and $swp1
and $swp2 (mid left and mid right) - these forward traffic. In the
drawing from the README, I suppose the names "swp1 ... swp4" were used
to illustrate that you can use switch net devices as host ports, and
also as forwarding ports.