netdev - Re: mv88e6321, dual cpu port

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Message-ID: <Y73ub0xgNmY5/4Qr@lunn.ch>
Date:   Wed, 11 Jan 2023 00:02:07 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Angelo Dureghello <angelo@...nel-space.org>, netdev@...r.kernel.org
Subject: Re: mv88e6321, dual cpu port

> > I cannot actually upgrade the kernel, due to cpu producer
> > customizations that are not mainlined, so would try to
> > downgrade the driver.
> 
> The delta between v5.4 and the kernel where support for multiple CPU
> ports was added is ~600 patches to the net/dsa/ folder alone. There are
> some non-trivial interdependencies with phylib, phylink, devlink, switchdev.
> You might also need support for the end result, if you end up cherry picking
> only what you think is useful. Hopefully that will help you reconsider.

v5.4 is really old, v5.10, v5.15 and v6.1 are also LTS kernels. I
suggest you ask your CPU vendor for a v6.1, or v5.15 port of their
vendor tree. v5.4 has a projected End Of Life December 2025, so if you
are going to invest a few months effort trying to get this working, do
you have enough time left to get some return on your investment? And a
plan what to do once it is EOL?

       Andrew