net: dsa: mv88e6xxx: Fix u64 statistics

[ Upstream commit 6e46e2d ]

The switch maintains u64 counters for the number of octets sent and
received. These are kept as two u32's which need to be combined.  Fix
the combing, which wrongly worked on u16's.

Fixes: 80c4627 ("dsa: mv88x6xxx: Refactor getting a single statistic")
Reported-by: Chris Healy <Chris.Healy@zii.aero>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: lunn

drivers/net/dsa/mv88e6xxx.c

@@ -712,7 +712,7 @@ static uint64_t _mv88e6xxx_get_ethtool_stat(struct dsa_switch *ds,
 		if (s->sizeof_stat == 8)
 			_mv88e6xxx_stats_read(ds, s->reg + 1, &high);
 	}
-	value = (((u64)high) << 16) | low;
+	value = (((u64)high) << 32) | low;
 	return value;
 }