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

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Message-ID: <c69e5d8d-5f2b-41f5-a8e9-8f34f383f60c@genexis.eu>
Date: Thu, 15 Jan 2026 20:10:20 +0100
From: Benjamin Larsson <benjamin.larsson@...exis.eu>
To: Andrew Lunn <andrew@...n.ch>, 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 15/01/2026 18:41, Andrew Lunn wrote:
> 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
>
Hi, datasheets say 16k and I have observed packet sizes close to that on 
the previous SoC generation EN7523 on the tx path.

MvH

Benjamin Larsson