netdev - Re: [PATCH net-next] net: ethernet: mediatek: support setting MTU

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Date:   Tue, 24 Nov 2020 14:54:58 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     DENG Qingfang <dqfext@...il.com>
Cc:     netdev@...r.kernel.org, Felix Fietkau <nbd@....name>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S . Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Frank Wunderlich <frank-w@...lic-files.de>,
        David Woodhouse <dwmw2@...radead.org>,
        Andrew Lunn <andrew@...n.ch>,
        Rene van Dorst <opensource@...rst.com>
Subject: Re: [PATCH net-next] net: ethernet: mediatek: support setting MTU

On Mon, 23 Nov 2020 11:45:22 +0800 DENG Qingfang wrote:
> MT762x HW, except for MT7628, supports frame length up to 2048
> (maximum length on GDM), so allow setting MTU up to 2030.
> 
> Signed-off-by: DENG Qingfang <dqfext@...il.com>

> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index 6d2d60675ffd..27cae3f43972 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -353,7 +353,7 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode,
>  	/* Setup gmac */
>  	mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
>  	mcr_new = mcr_cur;
> -	mcr_new |= MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE |
> +	mcr_new |= MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE |

This also changes the default MAX_RX from 1536 to 1518 (0).

I think you should at least mention this in the commit message.

>  		   MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_LINK;
>  
>  	/* Only update control register when needed! */

> @@ -320,7 +320,12 @@
>  
>  /* Mac control registers */
>  #define MTK_MAC_MCR(x)		(0x10100 + (x * 0x100))
> -#define MAC_MCR_MAX_RX_1536	BIT(24)
> +#define MAC_MCR_MAX_RX_LEN_MASK	GENMASK(25, 24)
> +#define MAC_MCR_MAX_RX_LEN(_x)	(MAC_MCR_MAX_RX_LEN_MASK & ((_x) << 24))
> +#define MAC_MCR_MAX_RX_LEN_1518	0x0
> +#define MAC_MCR_MAX_RX_LEN_1536	0x1
> +#define MAC_MCR_MAX_RX_LEN_1552	0x2
> +#define MAC_MCR_MAX_RX_LEN_2048	0x3
>  #define MAC_MCR_IPG_CFG		(BIT(18) | BIT(16))
>  #define MAC_MCR_FORCE_MODE	BIT(15)
>  #define MAC_MCR_TX_EN		BIT(14)