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SubjectRe: [PATCH v6 0/3] Add 802.1AD protocol support for dsa switch and ocelot driver

On 9/18/2020 5:20 PM, David Miller wrote:
> From:
> Date: Wed, 16 Sep 2020 17:48:42 +0800
>> 1. Overview
>> a) 0001* is for support to set dsa slave into 802.1AD(QinQ) mode.
>> b) 0002* is for vlan_proto support for br_switchdev_port_vlan_add and br_switchdev_port_vlan_del.
>> c) 0003* is for setting QinQ related registers in ocelot switch driver, after applying this patch, the switch(VSC99599)'s port can enable or disable QinQ mode.
> You're going to have to update every single SWITCHDEV_PORT_ADD_OBJ handler
> and subsequent helpers to check the validate the protocol value.
> You also are going to have to make sure that every instantiated
> switchdev_obj_port_vlan object initializes the vlan protocol field
> properly.
> Basically, now that this structure has a new member, everything that
> operates on that object must be updated to handle the new protocol
> value.
> And I do mean everything.
> You can't just add the protocol handling to the locations you care
> about for bridging and DSA.
> You also have to more fully address the feedback given by Vladimir
> in patch #3. Are the expectations on the user side a Linux based
> expectation, or one specific about how this ASIC is expected to
> behave by default. It is very unclear what you are talking about
> when you say customer and ISP etc.

Switch vendors like to refer to the outer tag as ISP VLAN tag and inner
tag as customer VLAN tag, sometimes S-TAG and C-TAG terms are used, too...

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