netdev - Re: [RFC PATCH net-next 3/4] net: dsa: create a helper for locating EtherType DSA headers on RX

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Message-ID: <YRHQ10WEJmKTeOEn@lunn.ch>
Date:   Tue, 10 Aug 2021 03:05:27 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        DENG Qingfang <dqfext@...il.com>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>
Subject: Re: [RFC PATCH net-next 3/4] net: dsa: create a helper for locating
 EtherType DSA headers on RX

On Mon, Aug 09, 2021 at 02:57:21PM +0300, Vladimir Oltean wrote:
> It seems that protocol tagging driver writers are always surprised about
> the formula they use to reach their EtherType header on RX, which
> becomes apparent from the fact that there are comments in multiple
> drivers that mention the same information.
> 
> Create a helper that returns a void pointer to skb->data - 2, as well as
> centralize the explanation why that is the case.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew