netdev - Re: [PATCH v2 2/4] net: tag: ksz: Add KSZ8863 tag code

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Date:   Wed, 18 Dec 2019 12:13:58 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Michael Grzeschik <m.grzeschik@...gutronix.de>, andrew@...n.ch
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kernel@...gutronix.de
Subject: Re: [PATCH v2 2/4] net: tag: ksz: Add KSZ8863 tag code

On 12/18/19 12:08 PM, Michael Grzeschik wrote:
> Add DSA tag code for Microchip KSZ8863 switch.
> 
> Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
> ---

[snip]
> +/* 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)
> + */

And another way to define a tag, snowflake after snowflake... anyway:

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian