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

From: "Arınç ÜNAL" <arinc.unal@arinc9.com>
To: Frank Wunderlich <linux@fw-web.de>, linux-mediatek@lists.infradead.org
Cc: Felix Fietkau <nbd@nbd.name>, John Crispin <john@phrozen.org>,
	Sean Wang <sean.wang@mediatek.com>,
	Mark Lee <Mark-MC.Lee@mediatek.com>,
	Lorenzo Bianconi <lorenzo@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno
	<angelogioacchino.delregno@collabora.com>,
	Russell King <linux@armlinux.org.uk>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org,
	Frank Wunderlich <frank-w@public-files.de>
Subject: Re: [net v2] net: ethernet: mtk_eth_soc: drop generic vlan rx offload, only use DSA untagging
Date: Wed, 26 Apr 2023 20:25:47 +0300	[thread overview]
Message-ID: <61ea49b7-8a04-214d-ef02-3ef6181619e9@arinc9.com> (raw)
In-Reply-To: <20230426172153.8352-1-linux@fw-web.de>

On 26/04/2023 20:21, Frank Wunderlich wrote:
> From: Felix Fietkau <nbd@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@public-files.de>
> Signed-off-by: Felix Fietkau <nbd@nbd.name>
> Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
> Tested-by: Arınç ÜNAL <arinc.unal@arinc9.com>
> ---
> v2:
> - changed commit message to drop "only one MAC used" phrase based on
>    Arincs comments
> - fixed too long line in commit description and add empty line after
>    declaration
> - add fixes tag
> 
> used felix Patch as base and ported up to 6.3-rc6
> 
> it basicly reverts changes from vladimirs patch
> 
> 1a3245fe0cf8 net: ethernet: mtk_eth_soc: fix DSA TX tag hwaccel for switch port 0
> 
> tested this on bananapi-r3 on non-dsa gmac1 and dsa eth0 (wan).
> on both vlan is working, but maybe it breaks HW-vlan-untagging

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?

Arınç

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