linux-kernel - [PATCH 4.4 282/312] net: dsa: mv88e6xxx: enable SA learning on DSA ports

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Message-Id: <20200508123144.243668620@linuxfoundation.org>
Date:   Fri,  8 May 2020 14:34:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 282/312] net: dsa: mv88e6xxx: enable SA learning on DSA ports

From: Vivien Didelot <vivien.didelot@...oirfairelinux.com>

commit 996ecb8246676100af2a4dc1cfed747712a3c85f upstream.

In multi-chip systems, DSA Tag ports must learn SA addresses in order to
correctly switch frames between interconnected chips.

This fixes cross-chip hardware bridging in a VLAN filtering aware
system, because a bridge group gets implemented as an hardware 802.1Q
VLAN and thus DSA and user ports share the same FDB.

Fixes: 4c7ea3c0791e ("net: dsa: mv88e6xxx: disable SA learning for DSA and CPU ports")
Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/dsa/mv88e6xxx.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -2064,8 +2064,8 @@ static int mv88e6xxx_setup_port(struct d
 	 * the other bits clear.
 	 */
 	reg = 1 << port;
-	/* Disable learning for DSA and CPU ports */
-	if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
+	/* Disable learning for CPU port */
+	if (dsa_is_cpu_port(ds, port))
 		reg = 0;

 	ret = _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_ASSOC_VECTOR, reg);