net: dsa: b53: skip multicast entries for fdb_dump()

port_fdb_dump() is supposed to only add fdb entries, but we iterate over
the full ARL table, which also includes multicast entries.

So check if the entry is a multicast entry before passing it on to the
callback().

Additionally, the port of those entries is a bitmask, not a port number,
so any included entries would have even be for the wrong port.

Fixes: 1da6df8 ("net: dsa: b53: Implement ARL add/del/dump operations")
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20251217205756.172123-1-jonas.gorski@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: KanjiMonster

drivers/net/dsa/b53/b53_common.c

@@ -2169,6 +2169,9 @@ static int b53_fdb_copy(int port, const struct b53_arl_entry *ent,
 	if (!ent->is_valid)
 		return 0;
 
+	if (is_multicast_ether_addr(ent->mac))
+		return 0;
+
 	if (port != ent->port)
 		return 0;