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

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Message-ID: <fc018e11-3957-4b2e-88a8-777057091923@lunn.ch>
Date: Fri, 16 Jan 2026 15:56:23 +0100
From: Andrew Lunn <andrew@...n.ch>
To: sayantan nandy <sayantann11@...il.com>
Cc: Benjamin Larsson <benjamin.larsson@...exis.eu>, 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 Fri, Jan 16, 2026 at 08:09:51PM +0530, sayantan nandy wrote:
> Hi all,
> 
> Thanks for the review and comments.
> 
> I checked the AN7581 HW and it does support MTU sizes up to 16K. However, as
> mentioned by Benjamin, larger packets consume more DMA descriptors, and while
> no extra buffers are allocated, this can put pressure on the descriptor rings.

Does the hardware consume DMA descriptors for the full 16K, not just
the number of descriptors needed for the actual received packet size?
That seems like a bad design.

      Andrew