linux-kernel - Re: [PATCH net] net: ethernet: mtk_eth_soc: disable hardware DSA untagging for second MAC

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Message-ID: <f753ad2b0c19e085867698f7bbbe37f6d172772e.camel@redhat.com>
Date:   Tue, 31 Jan 2023 14:00:43 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     arinc9.unal@...il.com, Felix Fietkau <nbd@....name>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        erkin.bozoglu@...ont.com
Subject: Re: [PATCH net] net: ethernet: mtk_eth_soc: disable hardware DSA
 untagging for second MAC

On Sat, 2023-01-28 at 12:42 +0300, arinc9.unal@...il.com wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> According to my tests on MT7621AT and MT7623NI SoCs, hardware DSA untagging
> won't work on the second MAC. Therefore, disable this feature when the
> second MAC of the MT7621 and MT7623 SoCs is being used.
> 
> Fixes: 2d7605a72906 ("net: ethernet: mtk_eth_soc: enable hardware DSA untagging")
> Link: https://lore.kernel.org/netdev/6249fc14-b38a-c770-36b4-5af6d41c21d3@arinc9.com/
> Tested-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---
> 
> Final send which should end up on the list. I tested this with Felix's
> upcoming patch series. This fix is still needed on top of it.
> 
> https://lore.kernel.org/netdev/20221230073145.53386-1-nbd@nbd.name/
> 
> The MTK_GMAC1_TRGMII capability is only on the MT7621 and MT7623 SoCs which
> I see this problem on. I'm new to coding so I took an educated guess from
> the use of MTK_NETSYS_V2 to disable this feature altogether for MT7986 SoC.

Keeping this one a little more on pw. It would be great is someone else
could validate the above on the relevant H/W.

Thanks,

Paolo