linux-kernel - Re: [PATCH net-next v3 3/6] net: add generic selftest support

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Message-ID: <YIv4owS5VxkadjoL@lunn.ch>
Date:   Fri, 30 Apr 2021 14:31:31 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Fugang Duan <fugang.duan@....com>,
        Sascha Hauer <kernel@...gutronix.de>,
        netdev <netdev@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        NXP Linux Team <linux-imx@....com>,
        Fabio Estevam <festevam@...il.com>,
        David Jander <david@...tonic.nl>,
        Russell King <linux@...linux.org.uk>,
        Philippe Schenker <philippe.schenker@...adex.com>
Subject: Re: [PATCH net-next v3 3/6] net: add generic selftest support

> Thanks for your patch, which is now commit 3e1e58d64c3d0a67 ("net: add
> generic selftest support") upstream.
> 
> > --- a/net/Kconfig
> > +++ b/net/Kconfig
> > @@ -429,6 +429,10 @@ config GRO_CELLS
> >  config SOCK_VALIDATE_XMIT
> >         bool
> >
> > +config NET_SELFTESTS
> > +       def_tristate PHYLIB
> 
> Why does this default to enabled if PHYLIB=y?
> Usually we allow the user to make selftests modular, independent of the
> feature under test, but I may misunderstand the purpose of this test.

Maybe there is a misunderstanding here with 'selftest'. The name page
for ethtool(1) says:

       -t --test
              Executes adapter selftest on the specified network device.  Pos‐
              sible test modes are:

           offline
                  Perform  full set of tests, possibly interrupting normal op‐
                  eration during the tests,

           online Perform limited set of tests, not interrupting normal opera‐
                  tion,

           external_lb
                  Perform  full set of tests, as for offline, and additionally
                  an external-loopback test.

This feature has nothing to do with tools/testing/selftests. It
predates that by decades.

     Andrew