linux-kernel - RE: [PATCH net-next 4/5] net: fec: remove rx_align from fec_enet

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Message-ID:
 <PAXPR04MB8510249AA3A61BA2853C708E88CAA@PAXPR04MB8510.eurprd04.prod.outlook.com>
Date: Fri, 14 Nov 2025 02:17:41 +0000
From: Wei Fang <wei.fang@....com>
To: Andrew Lunn <andrew@...n.ch>
CC: Shenwei Wang <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>,
	"andrew+netdev@...n.ch" <andrew+netdev@...n.ch>, "davem@...emloft.net"
	<davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"eric@...int.com" <eric@...int.com>, "imx@...ts.linux.dev"
	<imx@...ts.linux.dev>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net-next 4/5] net: fec: remove rx_align from
 fec_enet_private

> > Sorry, I misremembered the value of XDP_PACKET_HEADROOM. it should
> > be 256 bytes.
> >
> > See fec_enet_alloc_rxq_buffers():
> >
> > phys_addr = page_pool_get_dma_addr(page) + FEC_ENET_XDP_HEADROOM;
> > bdp->cbd_bufaddr = cpu_to_fec32(phys_addr);
> >
> > I will correct it in v2, thanks
> 
> So you could add a BUILD_BUG_ON() test which makes sure
> FEC_ENET_XDP_HEADROOM gives you the needed alignment. That way it is
> both "documented" and enforced. And it costs nothing at runtime.
> 

Yes, I will add such a check, thanks