netdev - RE: [PATCH v3 net-next 3/5] net: fec: add rx_frame

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Message-ID:
 <PAXPR04MB8510E7FBBDFD975D1D175237883EA@PAXPR04MB8510.eurprd04.prod.outlook.com>
Date: Mon, 25 Aug 2025 02:46:36 +0000
From: Wei Fang <wei.fang@....com>
To: Shenwei Wang <shenwei.wang@....com>
CC: Clark Wang <xiaoning.wang@....com>, Stanislav Fomichev <sdf@...ichev.me>,
	"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>, dl-linux-imx <linux-imx@....com>, Andrew Lunn
	<andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
	<daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, John
 Fastabend <john.fastabend@...il.com>
Subject: RE: [PATCH v3 net-next 3/5] net: fec: add rx_frame_size to support
 configurable RX length

> -		writel(fep->max_buf_size, fep->hwp + FEC_FTRL);
> +		writel(fep->rx_frame_size, fep->hwp + FEC_FTRL);
>  	}
>  #endif
> 
> @@ -4560,6 +4560,7 @@ fec_probe(struct platform_device *pdev)
>  	pinctrl_pm_select_sleep_state(&pdev->dev);
> 
>  	fep->pagepool_order = 0;
> +	fep->rx_frame_size = FEC_ENET_RX_FRSIZE;
>  	fep->max_buf_size = PKT_MAXBUF_SIZE;
>  	ndev->max_mtu = fep->max_buf_size - ETH_HLEN - ETH_FCS_LEN;
> 

The same comments as in v2, if max_buf_size < rx_frame_size, the packet
will be received by multiple Rx BDs, but the current driver only supports
one packet per Rx BD, so the Rx error statistic will be doubled with this
patch.