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    SubjectRe: [PATCH v6 0/3] Add 802.1AD protocol support for dsa switch and ocelot driver
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    From: hongbo.wang@nxp.com
    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.

    Thanks.

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