netdev - Re: [PATCH] net: airoha_eth: increase max mtu to 9220 for DSA jumbo frames

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Message-ID: <e86cea28-1495-4b1a-83f1-3b0f1899b85f@lunn.ch>
Date: Thu, 15 Jan 2026 18:41:47 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Sayantan Nandy <sayantann11@...il.com>
Cc: lorenzo@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
	sayantan.nandy@...oha.com, bread.hsu@...oha.com,
	kuldeep.malik@...oha.com, aniket.negi@...oha.com,
	rajeev.kumar@...oha.com
Subject: Re: [PATCH] net: airoha_eth: increase max mtu to 9220 for DSA jumbo
 frames

On Thu, Jan 15, 2026 at 02:18:37PM +0530, Sayantan Nandy wrote:
> The Industry standard for jumbo frame MTU is 9216 bytes. When using DSA
> sub-system, an extra 4 byte tag is added to each frame. To allow users
> to set the standard 9216-byte MTU via ifconfig,increase AIROHA_MAX_MTU
> to 9220 bytes (9216+4).

What does the hardware actually support? Is 9220 the real limit? 10K?
16K?

	Andrew