netdev - Re: [PATCH] net: dsa: tag_rtl4_a: Support also egress tags

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Message-ID: <CALW65jZr9QPg3uyATSRg-u_xyy1xFO=VFUWqX4pD=upBatAZCQ@mail.gmail.com>
Date:   Wed, 17 Feb 2021 13:40:07 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        Mauri Sandberg <sandberg@...lfence.com>
Subject: Re: [PATCH] net: dsa: tag_rtl4_a: Support also egress tags

On Wed, Feb 17, 2021 at 7:55 AM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> +       if (skb_cow_head(skb, RTL4_A_HDR_LEN) < 0)
> +               return NULL;

skb_cow_head is unnecessary here. DSA core will do it for you.

> +
> +       out = (RTL4_A_PROTOCOL_RTL8366RB << 12) | (2 << 8);
> +       /* The lower bits is the port numer */

Typo?

> +       out |= (u8)dp->index;
> +       p = (u16 *)(tag + 2);
> +       *p = htons(out);
> +
>         return skb;
>  }
>
> --
> 2.29.2
>