Aw: Re: [net v2] net: ethernet: mtk_eth_soc: drop generic vlan rx offload, only use DSA untagging

[Arınç ÜNAL]

On 26/04/2023 20:31, Frank Wunderlich wrote:
> 
>> Gesendet: Mittwoch, 26. April 2023 um 19:25 Uhr
>> Von: "Arınç ÜNAL" <arinc.unal at arinc9.com>
>> On 26/04/2023 20:21, Frank Wunderlich wrote:
>>> From: Felix Fietkau <nbd at nbd.name>
>>>
>>> Through testing I found out that hardware vlan rx offload support seems to
>>> have some hardware issues. At least when using multiple MACs and when
>>> receiving tagged packets on the secondary MAC, the hardware can sometimes
>>> start to emit wrong tags on the first MAC as well.
>>>
>>> In order to avoid such issues, drop the feature configuration and use
>>> the offload feature only for DSA hardware untagging on MT7621/MT7622
>>> devices where this feature works properly.
>>>
>>> Fixes: 08666cbb7dd5 ("net: ethernet: mtk_eth_soc: add support for configuring vlan rx offload")
>>> Tested-by: Frank Wunderlich <frank-w at public-files.de>
>>> Signed-off-by: Felix Fietkau <nbd at nbd.name>
>>> Signed-off-by: Frank Wunderlich <frank-w at public-files.de>
>>> Tested-by: Arınç ÜNAL <arinc.unal at arinc9.com>
>>
>> I'm confused by this. What is HW-vlan-untagging, and which SoCs do you
>> think this patch would break this feature? How can I utilise this
>> feature on Linux so I can confirm whether it works or not?
> 
> the feature itself breaks vlan on mac of bpi-r3
> 
> 1 mac is connected to switch and uses dsa tags, the other mac is directly accessible and vlan-tag
> there is stripped by this feature.
> 
> with this patch i can use vlans on the "standalone" mac again (see tagged packets incoming).

Ok, since this patch is disabling the feature, the patch cannot possibly 
break the feature. That's why I was confused as to why you mentioned 
this in a way that gives the impression that this patch may break the 
said feature.

Anyhow:

Acked-by: Arınç ÜNAL <arinc.unal at arinc9.com>

Arınç