ixgbe: check EEPROM for WOL support for X540 and above

This change aims to simplify the logic we use to determine WOL
support by reading the EEPROM bits for MACs X540 and newer.

Also some cleanups in ixgbe_wol_supported() - changed return type to
bool and removed redundant return variable by simply using return after
the checks.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe.h

@@ -895,8 +895,8 @@ void ixgbe_configure_tx_ring(struct ixgbe_adapter *, struct ixgbe_ring *);
 void ixgbe_disable_rx_queue(struct ixgbe_adapter *adapter, struct ixgbe_ring *);
 void ixgbe_update_stats(struct ixgbe_adapter *adapter);
 int ixgbe_init_interrupt_scheme(struct ixgbe_adapter *adapter);
-int ixgbe_wol_supported(struct ixgbe_adapter *adapter, u16 device_id,
-			       u16 subdevice_id);
+bool ixgbe_wol_supported(struct ixgbe_adapter *adapter, u16 device_id,
+			 u16 subdevice_id);
 #ifdef CONFIG_PCI_IOV
 void ixgbe_full_sync_mac_table(struct ixgbe_adapter *adapter);
 #endif

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -9185,21 +9185,33 @@ static inline int ixgbe_enumerate_functions(struct ixgbe_adapter *adapter)
 
 /**
  * ixgbe_wol_supported - Check whether device supports WoL
- * @hw: hw specific details
+ * @adapter: the adapter private structure
  * @device_id: the device ID
  * @subdev_id: the subsystem device ID
  *
  * This function is used by probe and ethtool to determine
  * which devices have WoL support
  *
  **/
-int ixgbe_wol_supported(struct ixgbe_adapter *adapter, u16 device_id,
-			u16 subdevice_id)
+bool ixgbe_wol_supported(struct ixgbe_adapter *adapter, u16 device_id,
+			 u16 subdevice_id)
 {
 	struct ixgbe_hw *hw = &adapter->hw;
 	u16 wol_cap = adapter->eeprom_cap & IXGBE_DEVICE_CAPS_WOL_MASK;
-	int is_wol_supported = 0;
 
+	/* WOL not supported on 82598 */
+	if (hw->mac.type == ixgbe_mac_82598EB)
+		return false;
+
+	/* check eeprom to see if WOL is enabled for X540 and newer */
+	if (hw->mac.type >= ixgbe_mac_X540) {
+		if ((wol_cap == IXGBE_DEVICE_CAPS_WOL_PORT0_1) ||
+		    ((wol_cap == IXGBE_DEVICE_CAPS_WOL_PORT0) &&
+		     (hw->bus.func == 0)))
+			return true;
+	}
+
+	/* WOL is determined based on device IDs for 82599 MACs */
 	switch (device_id) {
 	case IXGBE_DEV_ID_82599_SFP:
 		/* Only these subdevices could supports WOL */
@@ -9218,43 +9230,28 @@ int ixgbe_wol_supported(struct ixgbe_adapter *adapter, u16 device_id,
 		case IXGBE_SUBDEV_ID_82599_SFP_1OCP:
 		case IXGBE_SUBDEV_ID_82599_SFP_LOM_OEM1:
 		case IXGBE_SUBDEV_ID_82599_SFP_LOM_OEM2:
-			is_wol_supported = 1;
-			break;
+			return true;
 		}
 		break;
 	case IXGBE_DEV_ID_82599EN_SFP:
-		/* Only this subdevice supports WOL */
+		/* Only these subdevices support WOL */
 		switch (subdevice_id) {
 		case IXGBE_SUBDEV_ID_82599EN_SFP_OCP1:
-			is_wol_supported = 1;
-			break;
+			return true;
 		}
 		break;
 	case IXGBE_DEV_ID_82599_COMBO_BACKPLANE:
 		/* All except this subdevice support WOL */
 		if (subdevice_id != IXGBE_SUBDEV_ID_82599_KX4_KR_MEZZ)
-			is_wol_supported = 1;
+			return true;
 		break;
 	case IXGBE_DEV_ID_82599_KX4:
-		is_wol_supported = 1;
-		break;
-	case IXGBE_DEV_ID_X540T:
-	case IXGBE_DEV_ID_X540T1:
-	case IXGBE_DEV_ID_X550T:
-	case IXGBE_DEV_ID_X550T1:
-	case IXGBE_DEV_ID_X550EM_X_KX4:
-	case IXGBE_DEV_ID_X550EM_X_KR:
-	case IXGBE_DEV_ID_X550EM_X_10G_T:
-		/* check eeprom to see if enabled wol */
-		if ((wol_cap == IXGBE_DEVICE_CAPS_WOL_PORT0_1) ||
-		    ((wol_cap == IXGBE_DEVICE_CAPS_WOL_PORT0) &&
-		     (hw->bus.func == 0))) {
-			is_wol_supported = 1;
-		}
+		return  true;
+	default:
 		break;
 	}
 
-	return is_wol_supported;
+	return false;
 }
 
 /**