-#define MAC_CFG1_TXE BIT(0)
-#define MAC_CFG1_STX BIT(1)
-#define MAC_CFG1_RXE BIT(2)
-#define MAC_CFG1_SRX BIT(3)
-#define MAC_CFG1_LB BIT(8)
-#define MAC_CFG1_SR BIT(31)
+#define MAC_CFG1_TXE BIT(0) /* Tx Enable */
+#define MAC_CFG1_STX BIT(1) /* Synchronize Tx Enable */
+#define MAC_CFG1_RXE BIT(2) /* Rx Enable */
+#define MAC_CFG1_SRX BIT(3) /* Synchronize Rx Enable */
+#define MAC_CFG1_TFC BIT(4) /* Tx Flow Control Enable */
+#define MAC_CFG1_RFC BIT(5) /* Rx Flow Control Enable */
+#define MAC_CFG1_LB BIT(8) /* Loopback mode */
+#define MAC_CFG1_SR BIT(31) /* Soft Reset */