qla2xxx: Add diagnostic port functionality.

Add support for the D-port (diagnostic port) fabric switch feature.

(Fabric Switch initiates loopback style port testing)

Signed-off-by: Joe Carnuccio <joe.carnuccio@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/scsi/qla2xxx/qla_fw.h b/drivers/scsi/qla2xxx/qla_fw.h
index e8669aa7..7f2e1c7 100644
--- a/drivers/scsi/qla2xxx/qla_fw.h
+++ b/drivers/scsi/qla2xxx/qla_fw.h
@@ -318,7 +318,7 @@
 	 * BIT 4  = Enable Target Mode
 	 * BIT 5  = Disable Initiator Mode
 	 * BIT 6  = Acquire FA-WWN
-	 * BIT 7  = Reserved
+	 * BIT 7  = Enable D-port Diagnostics
 	 *
 	 * BIT 8  = Reserved
 	 * BIT 9  = Non Participating LIP