net: dsa: mv88e6xxx: fix port VLAN maps

BugLink: https://bugs.launchpad.net/bugs/1878232

commit be1faa92 upstream.

Currently the port based VLAN maps should be configured to allow every
port to egress frames on all other ports, except themselves.

The debugfs interface shows that they are misconfigured. For instance, a
7-port switch has the following content in the related register 0x06:

       GLOBAL GLOBAL2 SERDES   0    1    2    3    4    5    6
    ...
    6:  1fa4    1f0f       4   7f   7e   7d   7c   7b   7a   79
    ...

This means that port 3 is allowed to talk to port 2-6, but cannot talk
to ports 0 and 1. With this fix, port 3 can correctly talk to all ports
except 3 itself:

       GLOBAL GLOBAL2 SERDES   0    1    2    3    4    5    6
    ...
    6:  1fa4    1f0f       4   7e   7d   7b   77   6f   5f   3f
    ...

Fixes: ede8098d ("net: dsa: mv88e6xxx: bridges do not need an FID")
Reported-by: Kevin Smith <kevin.smith@elecsyscorp.com>
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Kevin Smith <kevin.smith@elecsyscorp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/net/dsa/mv88e6xxx.c

@@ -2150,7 +2150,8 @@ static int mv88e6xxx_setup_port(struct dsa_switch *ds, int port)
 	 * database, and allow every port to egress frames on all other ports.
 	 */
 	reg = BIT(ps->num_ports) - 1; /* all ports */
-	ret = _mv88e6xxx_port_vlan_map_set(ds, port, reg & ~port);
+	reg &= ~BIT(port); /* except itself */
+	ret = _mv88e6xxx_port_vlan_map_set(ds, port, reg);
 	if (ret)
 		goto abort;