linux-kernel - Re: [PATCH v4 2/2] net: dsa: ocelot: Add support for QinQ Operation

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Message-Id: <20200803.145843.2285407129021498421.davem@davemloft.net>
Date:   Mon, 03 Aug 2020 14:58:43 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     hongbo.wang@....com
Cc:     xiaoliang.yang_1@....com, allan.nielsen@...rochip.com,
        po.liu@....com, claudiu.manoil@....com,
        alexandru.marginean@....com, vladimir.oltean@....com,
        leoyang.li@....com, mingkai.hu@....com, andrew@...n.ch,
        f.fainelli@...il.com, vivien.didelot@...il.com, jiri@...nulli.us,
        idosch@...sch.org, kuba@...nel.org, vinicius.gomes@...el.com,
        nikolay@...ulusnetworks.com, roopa@...ulusnetworks.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        horatiu.vultur@...rochip.com, alexandre.belloni@...tlin.com,
        UNGLinuxDriver@...rochip.com, ivecera@...hat.com
Subject: Re: [PATCH v4 2/2] net: dsa: ocelot: Add support for QinQ Operation

From: hongbo.wang@....com
Date: Thu, 30 Jul 2020 18:25:05 +0800

> +	if (vlan->proto == ETH_P_8021AD) {
> +		ocelot->enable_qinq = true;
> +		ocelot_port->qinq_mode = true;
> +	}
 ...
> +	if (vlan->proto == ETH_P_8021AD) {
> +		ocelot->enable_qinq = false;
> +		ocelot_port->qinq_mode = false;
> +	}
> +

I don't understand how this can work just by using a boolean to track
the state.

This won't work properly if you are handling multiple QinQ VLAN entries.

Also, I need Andrew and Florian to review and ACK the DSA layer changes
that add the protocol value to the device notifier block.