[PATCH net] net: dsa: mt7530: don't change PVC_EG_TAG when CPU port becomes VLAN-aware

[Arınç ÜNAL]

On 6.02.2023 23:42, Vladimir Oltean wrote:
> On Mon, Feb 06, 2023 at 11:35:50PM +0300, Arınç ÜNAL wrote:
>> On 06/02/2023 23:33, Vladimir Oltean wrote:
>>> On Mon, Feb 06, 2023 at 10:41:47PM +0300, Arınç ÜNAL wrote:
>>>> One last thing. Specific to MT7530 switch in MT7621 SoC, if port at 5 is the
>>>> only CPU port defined on the devicetree, frames sent from DSA master appears
>>>> malformed on the user port. Packet capture on computer connected to the user
>>>> port is attached.
>>>>
>>>> The ARP frames on the pcapng file are received on the DSA master, I captured
>>>> them with tcpdump, and put it in the attachments. Then I start pinging from
>>>> the DSA master and the malformed frames appear on the pcapng file.
>>>>
>>>> It'd be great if you could take a look this final issue.
>>>
>>> What phy-mode does port at 5 use when it doesn't work? What about the DSA master?
>>
>> It's rgmii on port at 5 and gmac1.
> 
> What kind of RGMII? Plain "rgmii" on both ends, with no internal delays?
> With RGMII, somebody must add a skew to the clock signal relative to the
> data signals, so that setup/hold times at the other end are not violated.
> Either the transmitter or the receiver can add RGMII delays in each
> direction of communication, but someone must do it, and no more than one
> entity should do it.
> 
> So my question would be: could you retry after replacing phy-mode = "rgmii"
> with phy-mode = "rgmii-id" on port at 5? And if that doesn't change anything
> (unlikely but possible), also try "rgmii-txid" and "rgmii-rxid" in port at 5?
> Don't change the phy-mode on gmac1.

Still getting malformed frames. Packet capture for each phy-mode is 
attached. Made sure the phy-mode with:

# cat /proc/device-tree/ethernet at 1e100000/mac at 1/phy-mode
rgmii

# cat 
/proc/device-tree/ethernet at 1e100000/mdio-bus/switch at 1f/ports/port at 5/phy-mode
rgmii-id

# cat 
/proc/device-tree/ethernet at 1e100000/mdio-bus/switch at 1f/ports/port at 5/phy-mode
rgmii-txid

# cat 
/proc/device-tree/ethernet at 1e100000/mdio-bus/switch at 1f/ports/port at 5/phy-mode
rgmii-rxid

Arınç
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