ixgbe: Fix 1G link WoL

We reset during the shutdown path which will reset AUTOC register.  This
would change LMS to 10G.  If we were currently linked at 1G we will lose
link, which is a bad thing if we wanted WoL to work.  For the fix I needed
to know if WoL is supported so I created a new bool in the ixgbe_hw struct.
If this is set we will not allow the reset to change the current LMS value
in AUTOC.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c

@@ -1051,8 +1051,11 @@ static s32 ixgbe_reset_hw_82599(struct ixgbe_hw *hw)
 		/* If MNG FW is running on a multi-speed device that
 		 * doesn't autoneg with out driver support we need to
 		 * leave LMS in the state it was before we MAC reset.
+		 * Likewise if we support WoL we don't want change the
+		 * LMS state either.
 		 */
-		if (hw->phy.multispeed_fiber && hw->mng_fw_enabled)
+		if ((hw->phy.multispeed_fiber && hw->mng_fw_enabled) ||
+		    hw->wol_supported)
 			hw->mac.orig_autoc =
 				(hw->mac.orig_autoc & ~IXGBE_AUTOC_LMS_MASK) |
 				curr_lms;

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

@@ -7526,7 +7526,9 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* WOL not supported for all devices */
 	adapter->wol = 0;
 	hw->eeprom.ops.read(hw, 0x2c, &adapter->eeprom_cap);
-	if (ixgbe_wol_supported(adapter, pdev->device, pdev->subsystem_device))
+	hw->wol_supported = ixgbe_wol_supported(adapter, pdev->device,
+						pdev->subsystem_device);
+	if (hw->wol_supported)
 		adapter->wol = IXGBE_WUFC_MAG;
 
 	device_set_wakeup_enable(&adapter->pdev->dev, adapter->wol);

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

@@ -2998,6 +2998,7 @@ struct ixgbe_hw {
 	bool				force_full_reset;
 	bool				allow_unsupported_sfp;
 	bool				mng_fw_enabled;
+	bool				wol_supported;
 };
 
 struct ixgbe_info {