netdev - Re: [RFC net-next v3 09/10] net: bridge: mrp: Integrate MRP into the bridge

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Date:   Tue, 28 Jan 2020 10:56:23 +0100
From:   Jürgen Lambrecht <j.lambrecht@...evic.com>
To:     Andrew Lunn <andrew@...n.ch>,
        "Allan W. Nielsen" <allan.nielsen@...rochip.com>
Cc:     Horatiu Vultur <horatiu.vultur@...rochip.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bridge@...ts.linux-foundation.org, jiri@...nulli.us,
        ivecera@...hat.com, davem@...emloft.net, roopa@...ulusnetworks.com,
        nikolay@...ulusnetworks.com, anirudh.venkataramanan@...el.com,
        olteanv@...il.com, jeffrey.t.kirsher@...el.com,
        UNGLinuxDriver@...rochip.com
Subject: Re: [RFC net-next v3 09/10] net: bridge: mrp: Integrate MRP into the
 bridge

On 1/27/20 2:40 PM, Andrew Lunn wrote:
>> Again, I do not know how other HW is designed, but all the SOC's we are
>> working with, does allow us to add a TCAM rule which can redirect these
>> frames to the CPU even on a blocked port.
> It is not in scope for what you are doing, but i wonder how we
> describe this in a generic Linux way? And then how we push it down to
> the hardware?
>
> For the Marvell Switches, it might be possible to do this without the
> TCAM. You can add forwarding DB entries marked as Management. It is
> unclear if this overrides the blocked state, but it would be a bit odd
> if it did not.
A MGMT frame does override the blocked state according the the datasheet.
And any MAC address can be loaded, not only 01:80:C2:00:00:0x (802.1D) and 01:80:C2:00:00:2x (GARP). Then the ATU is used instead of something specialized.
(referring to Andrew's email of 20200126 6:12 PM)
(I only checked again 88E6250/88E6220/88E6071/88E6070/88E6020 Functional Specification)


Kind regards,

Jürgen