netdev - Re: mv88e6321, dual cpu port

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Date:   Tue, 10 Jan 2023 11:23:58 +0100 (CET)
From:   Angelo Dureghello <angelo@...nel-space.org>
To:     Andrew Lunn <andrew@...n.ch>
cc:     netdev@...r.kernel.org
Subject: Re: mv88e6321, dual cpu port

Hi Andrew,

thanks a lot for the prompt reply,

actually, seems i can use both cpu ports by
some brctl lines:

ip link add name br0 type bridge
ip link add name br1 type bridge
brctl addif br0 eth0
brctl addif br1 eth1

I verified looking the tx_packets statistics (ethtool -S)
and both eth0 and eth1 ports are used.

Is it something that may work, eventually as a workaround ?

Also, could you help me to know the kernel version
implementing dual cpu port properly ?

I cannot actually upgrade the kernel, due to cpu producer
customizations that are not mainlined, so would try to
downgrade the driver.

Thanks a lot,
regards,
angelo

On Mon, 9 Jan 2023, Andrew Lunn wrote:

> On Mon, Jan 09, 2023 at 09:40:06PM +0100, Angelo Dureghello wrote:
>> Hi All,
>>
>> using kernel 5.4.70,
>> just looking for confirmation this layout
>> can work:
>>
>>    eth0 -> cpu port (port5, mii)  bridging port3 and 4
>>    eth1 -> cpu port (port6, rgmii)  bridging port0, 1, 2
>>
>> My devicetree actaully defines 2 cpu ports, it seems
>> to work, but please let me know if you see any
>> possible issue.
>
> Dual CPU ports is not supported with 5.4.70. Everything will go over
> the first cpu port in DT.
>
>    Andrew
>