linux-kernel - [PATCH net] net: dsa: b53: Ensure the default VID is untagged

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Message-Id: <20200213191015.7150-1-f.fainelli@gmail.com>
Date:   Thu, 13 Feb 2020 11:10:15 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     olteanv@...il.com, Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net] net: dsa: b53: Ensure the default VID is untagged

We need to ensure that the default VID is untagged otherwise the switch
will be sending frames tagged frames and the results can be problematic.
This is especially true with b53 switches that use VID 0 as their
default VLAN since VID 0 has a special meaning.

Fixes: fea83353177a ("net: dsa: b53: Fix default VLAN ID")
Fixes: 061f6a505ac3 ("net: dsa: Add ndo_vlan_rx_{add, kill}_vid implementation")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/dsa/b53/b53_common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 449a22172e07..f25c43b300d4 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1366,6 +1366,9 @@ void b53_vlan_add(struct dsa_switch *ds, int port,
 
 		b53_get_vlan_entry(dev, vid, vl);
 
+		if (vid == b53_default_pvid(dev))
+			untagged = true;
+
 		vl->members |= BIT(port);
 		if (untagged && !dsa_is_cpu_port(ds, port))
 			vl->untag |= BIT(port);
-- 
2.17.1