netdev - Re: [RFC PATCH net-next 08/11] net: dsa: microchip: lan937x: avoid mib read for cascaded port

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Date:   Thu, 2 Feb 2023 16:45:17 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Rakesh Sankaranarayanan <rakesh.sankaranarayanan@...rochip.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        f.fainelli@...il.com, olteanv@...il.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        linux@...linux.org.uk
Subject: Re: [RFC PATCH net-next 08/11] net: dsa: microchip: lan937x: avoid
 mib read for cascaded port

On Thu, Feb 02, 2023 at 06:29:27PM +0530, Rakesh Sankaranarayanan wrote:
> Cascaded port need not be involved in mib read process. Unlike cpu port,
> mib read function will be called for all other ports. Add check to skip
> function if port is of type DSA_PORT_TYPE_DSA.

I would actually read the statistics. Having debugged D in DSA
systems, it is useful to know if packets are making it from one switch
to the other, etc.

The problem is getting the information out of the kernel. For
mv88e6xxx we have had an out of tree patch which exposes this
information in debugfs.

	Andrew