linux-kernel - [RFC PATCH net-next] net: dsa: vsc73xx: remove ds->untag_bridge

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Message-ID: <20241008104657.3549151-1-vladimir.oltean@nxp.com>
Date: Tue,  8 Oct 2024 13:46:57 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Pawel Dembicki <paweldembicki@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next] net: dsa: vsc73xx: remove ds->untag_bridge_pvid request

Similar to the situation described for sja1105 in commit 1f9fc48fd302
("net: dsa: sja1105: fix reception from VLAN-unaware bridges") from the
'net' tree, the vsc73xx driver uses tag_8021q.

The ds->untag_bridge_pvid option strips VLANs from packets received on
VLAN-unaware bridge ports. But those VLANs should already be stripped by
tag_vsc73xx_8021q.c as part of vsc73xx_rcv(). It is even plausible that
the same bug that existed for sja1105 also exists for vsc73xx:
dsa_software_untag_vlan_unaware_bridge() tries to untag a VLAN that
doesn't exist, corrupting the packet.

Only compile tested, as I don't have access to the hardware.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/dsa/vitesse-vsc73xx-core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index e4b98fd51643..f18aa321053d 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -851,7 +851,6 @@ static int vsc73xx_setup(struct dsa_switch *ds)

 	dev_info(vsc->dev, "set up the switch\n");

-	ds->untag_bridge_pvid = true;
 	ds->max_num_bridges = DSA_TAG_8021Q_MAX_NUM_BRIDGES;
 	ds->fdb_isolation = true;

-- 
2.43.0