netdev - Re: [PATCH v3 3/5] net: tag: ksz: Add KSZ8863 tag code

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Date:   Sat, 9 May 2020 18:41:05 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Grzeschik <m.grzeschik@...gutronix.de>
Cc:     netdev@...r.kernel.org, f.fainelli@...il.com, davem@...emloft.net,
        kernel@...gutronix.de
Subject: Re: [PATCH v3 3/5] net: tag: ksz: Add KSZ8863 tag code

> +/* For ingress (Host -> KSZ8863), 1 byte is added before FCS.
> + * ---------------------------------------------------------------------------
> + * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|tag1(1byte)|FCS(4bytes)
> + * ---------------------------------------------------------------------------
> + * tag0[1,0] : represents port
> + *             (e.g. 0b00=addr-lookup 0b01=port1, 0b10=port2, 0b11=port1+port2)
> + * tag0[3,2] : bits two and three represent prioritization
> + *             (e.g. 0b00xx=prio0, 0b01xx=prio1, 0b10xx=prio2, 0b11xx=prio3)
> + *
> + * For egress (KSZ8873 -> Host), 1 byte is added before FCS.
> + * ---------------------------------------------------------------------------
> + * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
> + * ---------------------------------------------------------------------------
> + * tag0[0]   : zero-based value represents port
> + *             (eg, 0b0=port1, 0b1=port2)
> + */
> +
> +static struct sk_buff *ksz8863_xmit(struct sk_buff *skb,
> +				    struct net_device *dev)
> +{
> +	struct dsa_port *dp = dsa_slave_to_port(dev);
> +	struct sk_buff *nskb;
> +	__be16 *tag;

The comment says 1 byte is added. But tag is a u16?

    Andrew