netdev - Re: [PATCH net-next v3] net: airoha_eth: increase max MTU to 9220 for DSA jumbo frames

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Message-ID: <fa6a4cfa-0169-46e3-8c7e-190b69a97e91@lunn.ch>
Date: Mon, 19 Jan 2026 15:50:58 +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,
	brown.huang@...oha.com
Subject: Re: [PATCH net-next v3] net: airoha_eth: increase max MTU to 9220
 for DSA jumbo frames

On Mon, Jan 19, 2026 at 01:06:58PM +0530, Sayantan Nandy wrote:
> 
> The industry standard jumbo frame MTU is 9216 bytes. When using the DSA
> subsystem, a 4-byte tag is added to each Ethernet frame.
> 
> Increase AIROHA_MAX_MTU to 9220 bytes (9216 + 4) so that users can set a
> standard 9216-byte MTU on DSA ports.
> 
> The underlying hardware supports significantly larger frame sizes
> (approximately 16K). However, the maximum MTU is limited to 9220 bytes
> for now, as this is sufficient to support standard jumbo frames and does
> not incur additional memory allocation overhead.
> 
> 
> Signed-off-by: Sayantan Nandy <sayantann11@...il.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew