netdev - RE: [EXT] Re: [PATCH v6 0/3] Add 802.1AD protocol support for dsa switch and ocelot driver

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Message-ID: <VI1PR04MB5677B72C6AFFB0E97357C94AE13A0@VI1PR04MB5677.eurprd04.prod.outlook.com>
Date:   Mon, 21 Sep 2020 03:05:22 +0000
From:   Hongbo Wang <hongbo.wang@....com>
To:     David Miller <davem@...emloft.net>
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>,
        "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 0/3] Add 802.1AD protocol support for dsa
 switch and ocelot driver

> 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.
> 

Hi David,

Thanks for your comments.

I understand your concerns, I will review the code.
Generally, the packets from customer port will have only C-TAG, but the packets form ISP port will have both S-TAG and C-TAG. For ocelot switch, these two ports have different register config.


Thanks
hongbo