scsi: qedf: Honor priority from DCBX FCoE App tag

We currently hard code the priority in the 8021q tag to 3 for FCoE
traffic.  The vast majority of the time this is fine but if the priority
is something else besides 3, any VLAN ID comparison either in the
non-offload path or offload path will fail and cause dropped frames
where none are expected.

Change the behavior so that the driver default is 3 if we do not get any
DCBX convergence.

If DCBX does converge, then set the FIP/FCoE priority in the following
manner:

 1. If the qedf_default_prio modparam is set use that
 2. If the DCBX FCoE priority is not in range (0..7) use 3
 3. Use the DCBX FCoE priority we get in the driver's DCBX handler

Signed-off-by: Chad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qedf/qedf.h

@@ -301,6 +301,7 @@ struct qedf_ctx {
 #define QEDF_FALLBACK_VLAN	1002
 #define QEDF_DEFAULT_PRIO	3
 	int vlan_id;
+	u8 prio;
 	struct qed_dev *cdev;
 	struct qed_dev_fcoe_info dev_info;
 	struct qed_int_info int_info;