Re: [PATCH net RFC] net: dsa: mt7530: fix link-local frames that ingress vlan filtering ports

From: Vladimir Oltean <olteanv@gmail.com>
To: arinc.unal@arinc9.com
Cc: "Daniel Golle" <daniel@makrotopia.org>,
	"DENG Qingfang" <dqfext@gmail.com>,
	"Sean Wang" <sean.wang@mediatek.com>,
	"Andrew Lunn" <andrew@lunn.ch>,
	"Florian Fainelli" <f.fainelli@gmail.com>,
	"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>,
	"Alvin Šipraga" <ALSI@bang-olufsen.dk>,
	"Frank Wunderlich" <frank-w@public-files.de>,
	"Bartel Eerdekens" <bartel.eerdekens@constell8.be>,
	mithat.guner@xeront.com, erkin.bozoglu@xeront.com,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org
Subject: Re: [PATCH net RFC] net: dsa: mt7530: fix link-local frames that ingress vlan filtering ports
Date: Fri, 2 Feb 2024 01:26:19 +0200	[thread overview]
Message-ID: <20240201232619.nsmm7lvafuem2gou@skbuf> (raw)
In-Reply-To: <65bbf40d.170a0220.a87f4.becdSMTPIN_ADDED_BROKEN@mx.google.com> <65bbf40d.170a0220.a87f4.becdSMTPIN_ADDED_BROKEN@mx.google.com>

On Thu, Feb 01, 2024 at 10:13:39PM +0300, Arınç ÜNAL via B4 Relay wrote:
> One remaining limitation is that the ingress port must have a PVID assigned
> to it for the frame to be trapped to the CPU port. A PVID is set by default
> on vlan aware and vlan unaware ports. However, when the network interface
> that pertains to the ingress port is attached to a vlan_filtering enabled
> bridge, the user can remove the PVID assignment from it which would prevent
> the link-local frames from being trapped to the CPU port.
> 
> Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
> ---
> I couldn't figure out a way to bypass VLAN table lookup for link-local
> frames to directly trap them to the CPU port. The CPU port is hardcoded for
> MT7530. For MT7531 and the switch on the MT7988 SoC, it depends on the port
> matrix to choose the CPU port to trap the frames to. Port matrix and VLAN
> table seem to go hand in hand so I don't know if this would even be
> possible.
> 
> If possible to implement, link-local frames must not be influenced by the
> VLAN table. They must always be trapped to the CPU port, and trapped
> untagged.

Isn't this, in effect, what the "Leaky VLAN Enable" bit does?

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