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

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Date:   Thu, 17 Sep 2020 02:37:59 +0000
From:   Hongbo Wang <hongbo.wang@....com>
To:     Vladimir Oltean <olteanv@...il.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?

hi Vladimir,
you can refer to "4.3.3.0.1 MAN Access Switch Example" in VSC99599_1_00_TS.pdf,
By testing the case, if don't set VLAN_AWARE_ENA=0 for customer's port swp0,
the Q-in-Q feature can't work well.

In order to distinguish the port for customer and for ISP, I add devlink command,
Actually, I can modify the driver config directly, not using devlink, but it will be not compatible with current 
code and user guide. 

Thanks,
hongbo