linux-kernel - Re: [PATCH net] net: ag71xx: remove unnecessary MTU reservation

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Message-ID: <20210218052815.buawrjs4tti5e6m5@pengutronix.de>
Date:   Thu, 18 Feb 2021 06:28:15 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     DENG Qingfang <dqfext@...il.com>
Cc:     Oleksij Rempel <linux@...pel-privat.de>,
        Chris Snook <chris.snook@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rosen Penev <rosenp@...il.com>
Subject: Re: [PATCH net] net: ag71xx: remove unnecessary MTU reservation

On Thu, Feb 18, 2021 at 11:45:14AM +0800, DENG Qingfang wrote:
> 2 bytes of the MTU are reserved for Atheros DSA tag, but DSA core
> has already handled that since commit dc0fe7d47f9f.
> Remove the unnecessary reservation.
> 
> Fixes: d51b6ce441d3 ("net: ethernet: add ag71xx driver")
> Signed-off-by: DENG Qingfang <dqfext@...il.com>

Reviewed-by: Oleksij Rempel <o.rempel@...gutronix.de>

Thank you!

> ---
>  drivers/net/ethernet/atheros/ag71xx.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/atheros/ag71xx.c b/drivers/net/ethernet/atheros/ag71xx.c
> index dd5c8a9038bb..a60ce9030581 100644
> --- a/drivers/net/ethernet/atheros/ag71xx.c
> +++ b/drivers/net/ethernet/atheros/ag71xx.c
> @@ -223,8 +223,6 @@
>  #define AG71XX_REG_RX_SM	0x01b0
>  #define AG71XX_REG_TX_SM	0x01b4
>  
> -#define ETH_SWITCH_HEADER_LEN	2
> -
>  #define AG71XX_DEFAULT_MSG_ENABLE	\
>  	(NETIF_MSG_DRV			\
>  	| NETIF_MSG_PROBE		\
> @@ -933,7 +931,7 @@ static void ag71xx_hw_setup(struct ag71xx *ag)
>  
>  static unsigned int ag71xx_max_frame_len(unsigned int mtu)
>  {
> -	return ETH_SWITCH_HEADER_LEN + ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
> +	return ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
>  }
>  
>  static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
> -- 
> 2.25.1
> 
> 

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