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

[Vladimir Oltean]

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