# \[PATCH net\] dsa: tag\_dsa: Fix mask for trunked packets - From: Andrew Lunn \ - Date: 2021-10-03 15:51:09 - List: netdev - Page: https://ratatoskr.run/netdev/2021/10/11212559 - Thread: https://ratatoskr.run/netdev/2021/10/11212559/t.md ```text 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 --- 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 77d0ce89ab77..e5127b7d1c6a 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: -- 2.33.0 ```