netdev - Re: [PATCH net-next] net: dsa: lantiq_gswip: Add support for dumping the registers

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Date:   Tue, 13 Apr 2021 21:25:07 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kuba@...nel.org, davem@...emloft.net, olteanv@...il.com,
        f.fainelli@...il.com, vivien.didelot@...il.com,
        Hauke Mehrtens <hauke@...ke-m.de>
Subject: Re: [PATCH net-next] net: dsa: lantiq_gswip: Add support for dumping
 the registers

On Tue, Apr 13, 2021 at 1:45 AM Andrew Lunn <andrew@...n.ch> wrote:
[...]
> > > and a few people have forked it and modified it for other DSA
> > > switches. At some point we might want to try to merge the forks back
> > > together so we have one tool to dump any switch.
> > actually I was wondering if there is some way to make the registers
> > "easier to read" in userspace.
>
> You can add decoding to ethtool. The marvell chips have this, to some
> extent. But the ethtool API is limited to just port registers, and
> there can be a lot more registers which are not associated to a
> port. devlink gives you access to these additional registers.
oh, then that's actually also a problem with my patch:
the .get_regs implementation currently also uses five registers which
are not related to the specific port.
noted in case I re-send this as .get_regs patch instead of moving over
to devlink.

Thanks for the hints as always!


Martin