netdev - Re: [PATCH] dsa: tag_rtl4_a: Bump min packet size

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Message-ID: <CACRpkdZXAqkn0QeX4s2JFmyMOz82uQq7C18408Kow-peN8tCqA@mail.gmail.com>
Date: Mon, 30 Oct 2023 08:39:26 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: Vladimir Oltean <olteanv@...il.com>, DENG Qingfang <dqfext@...il.com>, 
	Mauri Sandberg <sandberg@...lfence.com>, Florian Fainelli <f.fainelli@...il.com>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dsa: tag_rtl4_a: Bump min packet size

On Mon, Oct 30, 2023 at 12:00 AM Andrew Lunn <andrew@...n.ch> wrote:

> > 1496 is suspiciously much 1500 - DSA tag size. However the
> > MTU of the parent ethernet is bumped nicely to 1504 and the
> > device MTU is set up to accomodate it as well.
> >
> > Modifying the patch to just pad out packets >= 1496 bytes
> > solves the problem in a better way, but maybe that is not the
> > last thing we try here...
>
> Have you tried playing with RTL8366RB_SGCR in rtl8366rb_change_mtu()?

Yes I set the MTU to increasingly larger sizes.

Sadly MTU has nothing to do with this, it's really annoying,
I have a v2 patch that is better and working, I'll include some test
text so you see where the problem is.

Yours,
Linus Walleij