netdev - Re: [PATCH] net: spacemit: k1-emac: program frame size registers for jumbo frames

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Message-ID: <169bffe4-5292-48b5-b8e7-448fa4288598@lunn.ch>
Date: Mon, 26 Jan 2026 17:20:31 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Tomas Hlavacek <tmshlvck@...il.com>
Cc: netdev@...r.kernel.org, linux-riscv@...ts.infradead.org,
	spacemit@...ts.linux.dev, "David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>, Yixun Lan <dlan@...nel.org>,
	Vivian Wang <wangruikang@...as.ac.cn>
Subject: Re: [PATCH] net: spacemit: k1-emac: program frame size registers for
 jumbo frames

On Mon, Jan 26, 2026 at 02:59:19PM +0100, Tomas Hlavacek wrote:
> The driver allows changing MTU up to 4K via emac_change_mtu() and
> allocates appropriately sized DMA buffers, but it never programs the
> MAC_MAXIMUM_FRAME_SIZE and MAC_RECEIVE_JABBER_SIZE registers.
> 
> This causes the MAC hardware to reject frames larger than the default
> 1518 bytes, even when larger buffers are allocated. Frames exceeding
> the default size trigger jabber errors and are discarded.

This sounds like a fix? Should it have a Fixes: tag? Should it be
added to stable?

https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html

	Andrew