From: Florian Fainelli <f.fainelli@gmail.com>
Date: Mon, 20 Apr 2020 20:26:51 -0700
Subject: net: dsa: b53: Lookup VID in ARL searches when VLAN is enabled
Git-commit: 2e97b0cd1651a270f3a3fcf42115c51f3284c049
Patch-mainline: 5.7-rc3
References: networking-stable-20_04_27

When VLAN is enabled, and an ARL search is issued, we also need to
compare the full {MAC,VID} tuple before returning a successful search
result.

Fixes: 1da6df85c6fb ("net: dsa: b53: Implement ARL add/del/dump operations")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/net/dsa/b53/b53_common.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1456,6 +1456,9 @@ static int b53_arl_read(struct b53_devic
 			continue;
 		if ((mac_vid & ARLTBL_MAC_MASK) != mac)
 			continue;
+		if (dev->vlan_enabled &&
+		    ((mac_vid >> ARLTBL_VID_S) & ARLTBL_VID_MASK) != vid)
+			continue;
 		*idx = i;
 	}