netdev - Re: [EXT] Re: [PATCH v6 3/3] net: dsa: ocelot: Add support for QinQ Operation

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Date:   Wed, 16 Sep 2020 13:45:39 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Hongbo Wang <hongbo.wang@....com>
Cc:     Xiaoliang Yang <xiaoliang.yang_1@....com>, Po Liu <po.liu@....com>,
        Mingkai Hu <mingkai.hu@....com>,
        "allan.nielsen@...rochip.com" <allan.nielsen@...rochip.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandru Marginean <alexandru.marginean@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Leo Li <leoyang.li@....com>, "andrew@...n.ch" <andrew@...n.ch>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "jiri@...nulli.us" <jiri@...nulli.us>,
        "idosch@...sch.org" <idosch@...sch.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "vinicius.gomes@...el.com" <vinicius.gomes@...el.com>,
        "nikolay@...ulusnetworks.com" <nikolay@...ulusnetworks.com>,
        "roopa@...ulusnetworks.com" <roopa@...ulusnetworks.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "horatiu.vultur@...rochip.com" <horatiu.vultur@...rochip.com>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "ivecera@...hat.com" <ivecera@...hat.com>
Subject: Re: [EXT] Re: [PATCH v6 3/3] net: dsa: ocelot: Add support for QinQ
 Operation

On Wed, Sep 16, 2020 at 10:28:38AM +0000, Hongbo Wang wrote:
> Hi Vladimir,
>
> if swp0 connects with customer, and swp1 connects with ISP, According
> to the VSC99599_1_00_TS.pdf, swp0 and swp1 will have different
> VLAN_POP_CNT && VLAN_AWARE_ENA,
>
> swp0 should set VLAN_CFG.VLAN_POP_CNT=0 && VLAN_CFG.VLAN_AWARE_ENA=0
> swp1 should set VLAN_CFG.VLAN_POP_CNT=1 && VLAN_CFG.VLAN_AWARE_ENA=1
>
> but when set vlan_filter=1, current code will set same value for both
> swp0 and swp1, for compatibility with existing code(802.1Q mode), so
> add devlink to set swp0 and swp1 into different modes.

But if you make VLAN_CFG.VLAN_AWARE_ENA=0, does that mean the switch
will accept any 802.1ad VLAN, not only those configured in the VLAN
database of the bridge? Otherwise said, after running the commands
above, and I send a packet to swp0 having tpid:88A8 vid:101, then the
bridge should not accept it.

I might be wrong, but I thought that an 802.1ad bridge with
vlan_filtering=1 behaves the same as an 802.1q bridge, except that it
should filter VLANs using a different TPID (0x88a8 instead of 0x8100).
I don't think the driver, in the way you're configuring it, does that,
does it?

Thanks,
-Vladimir