netdev - Re: mv88e6321, dual cpu port

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Message-ID: <9e722bb5-a4f6-3f04-39bc-8775d054a0f2@kernel-space.org>
Date:   Wed, 25 Jan 2023 10:04:46 +0100 (CET)
From:   Angelo Dureghello <angelo@...nel-space.org>
To:     Andrew Lunn <andrew@...n.ch>
cc:     Vladimir Oltean <olteanv@...il.com>, netdev@...r.kernel.org
Subject: Re: mv88e6321, dual cpu port

Hi Andrew and Vladimir,

thanks a lot for both your suggestions, will study and reason
on them, and likely try them.

On Tue, 24 Jan 2023, Andrew Lunn wrote:

> On Tue, Jan 24, 2023 at 08:21:35AM +0100, Angelo Dureghello wrote:
>>
>> Hi Andrew and Vladimir,
>>
>> On Mon, 23 Jan 2023, Andrew Lunn wrote:
>>
>>>> I don't know what this means:
>>>>
>>>> | I am now trying this way on mv88e6321,
>>>> | - one vlan using dsa kernel driver,
>>>> | - other vlan using dsdt userspace driver.
>>>>
>>>> specifically what is "dsdt userspace driver".
>>>
>>> I think DSDT is Marvells vendor crap code.
>>>
>> Yes, i have seen someone succeeding using it, why do you think it's crap ?
>
> In the Linux kernel community, that is the name given to vendor code,
> because in general, that is the quality level. The quality does vary
> from vendor to vendor and SDK to SDK, some are actually O.K.
>
>>
>>> Having two drivers for the same hardware is a recipe for disaster.
>>>
>>>  Andrew
>>>
>>
>> What i need is something as
>>
>>         eth0 ->  vlan1 -> port5(rmii)  ->  port 0,1,2
>>         eth1 ->  vlan2 -> port6(rgmii) ->  port 3,4
>>
>> The custom board i have here is already designed in this way
>> (2 fixed-link mac-to-mac connecitons) and trying my best to have
>> the above layout working.
>
> With todays mainline i would do:
>
> So set eth0 as DSA master port.
>
> Create a bridge br0 with ports 0, 1, 2.
> Create a bridge br1 with ports 3, 4, 6.
>
> You don't actually make use of the br1 interface in Linux, it just
> needs to be up. You can think of eth1 being connected to an external
> managed switch.
>
> 	Andrew
>

Thanks,
angelo