ixgbe: dcb, do not tag tc_prio_control frames

The network stack indicate packets should not be DCB
tagged by setting the priority to TC_PRIO_CONTROL. One
usage for this is lldp frames which are not suppossed
to be tagged.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index d80bb1a77ecb..caf1114960ef 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -6075,7 +6075,8 @@ static netdev_tx_t ixgbe_xmit_frame(struct sk_buff *skb,
                 }
                 tx_flags <<= IXGBE_TX_FLAGS_VLAN_SHIFT;
                 tx_flags |= IXGBE_TX_FLAGS_VLAN;
-        } else if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
+        } else if (adapter->flags & IXGBE_FLAG_DCB_ENABLED &&
+                   skb->priority != TC_PRIO_CONTROL) {
                 tx_flags |= ((skb->queue_mapping & 0x7) << 13);
                 tx_flags <<= IXGBE_TX_FLAGS_VLAN_SHIFT;
                 tx_flags |= IXGBE_TX_FLAGS_VLAN;