From b44d52a50bc6f191f0ae03f65de8401f3ef039b3 Mon Sep 17 00:00:00 2001
From: Andrew Lunn <andrew@lunn.ch>
Date: Sun, 3 Oct 2021 17:50:53 +0200
Subject: [PATCH] dsa: tag_dsa: Fix mask for trunked packets
A packet received on a trunk will have bit 2 set in Forward DSA tagged
frame. Bit 1 can be either 0 or 1 and is otherwise undefined and bit 0
indicates the frame CFI. Masking with 7 thus results in frames as
being identified as being from a trunk when in fact they are not. Fix
the mask to just look at bit 2.
Fixes: 5b60dadb71db ("net: dsa: tag_dsa: Support reception of packets from LAG devices")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/dsa/tag_dsa.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index 77d0ce89ab77a..e5127b7d1c6a5 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -210,7 +210,7 @@ static struct sk_buff *dsa_rcv_ll(struct sk_buff *skb, struct net_device *dev,
cmd = dsa_header[0] >> 6;
switch (cmd) {
case DSA_CMD_FORWARD:
- trunk = !!(dsa_header[1] & 7);
+ trunk = !!(dsa_header[1] & 4);
break;
case DSA_CMD_TO_CPU:
--
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