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

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Message-ID: <54f8d583-e900-4ce8-87d1-a18556698f10@lunn.ch>
Date: Mon, 30 Oct 2023 00:00:46 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Linus Walleij <linus.walleij@...aro.org>
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

> 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()?

I had an annoying bug in the mv88e6xxx driver where the MTU
configuration register was up to, but not including... So i had to
change a <= to <.

	Andrew