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Date: Mon, 11 Oct 2021 15:47:03 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
Vladimir Oltean <vladimir.oltean@....com>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.14 151/151] dsa: tag_dsa: Fix mask for trunked packets
From: Andrew Lunn <andrew@...n.ch>
commit b44d52a50bc6f191f0ae03f65de8401f3ef039b3 upstream.
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@...n.ch>
Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
net/dsa/tag_dsa.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -176,7 +176,7 @@ static struct sk_buff *dsa_rcv_ll(struct
case DSA_CMD_FORWARD:
skb->offload_fwd_mark = 1;
- trunk = !!(dsa_header[1] & 7);
+ trunk = !!(dsa_header[1] & 4);
break;
case DSA_CMD_TO_CPU:
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