netdev - Re: [PATCH] net: airoha_eth: increase max MTU to 9220 for DSA jumbo frame support 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

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Message-ID: <aWidzQgGXpbht9zL@lore-desk>
Date: Thu, 15 Jan 2026 08:57:01 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Sayantan Nandy <sayantann11@...il.com>
Cc: 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
Subject: Re: [PATCH] net: airoha_eth: increase max MTU to 9220 for DSA jumbo
 frame support 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).

> This change ensures compatibility with common network equipment and jumbo frame configurations.

can you please provide more details?

Regards,
Lorenzo

> 
> Signed-off-by: Sayantan Nandy <sayantann11@...il.com>
> ---
>  drivers/net/ethernet/airoha/airoha_eth.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/airoha/airoha_eth.h b/drivers/net/ethernet/airoha/airoha_eth.h
> index fbbc58133364..20e602d61e61 100644
> --- a/drivers/net/ethernet/airoha/airoha_eth.h
> +++ b/drivers/net/ethernet/airoha/airoha_eth.h
> @@ -21,7 +21,7 @@
>  #define AIROHA_MAX_NUM_IRQ_BANKS	4
>  #define AIROHA_MAX_DSA_PORTS		7
>  #define AIROHA_MAX_NUM_RSTS		3
> -#define AIROHA_MAX_MTU			9216
> +#define AIROHA_MAX_MTU			9220
>  #define AIROHA_MAX_PACKET_SIZE		2048
>  #define AIROHA_NUM_QOS_CHANNELS		4
>  #define AIROHA_NUM_QOS_QUEUES		8
> -- 
> 2.43.0
> 

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