ixgbevf: Adjust to handle unassigned MAC address from PF

If the administrator has not assigned a MAC address to the VF via the
PF then handle it gracefully by generating a temporary MAC address.
This ensures that we always know when we have a random address and
udev won't get upset about it.
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c

@@ -2052,6 +2052,7 @@ static int ixgbevf_sw_init(struct ixgbevf_adapter *adapter)
 {
 	struct ixgbe_hw *hw = &adapter->hw;
 	struct pci_dev *pdev = adapter->pdev;
+	struct net_device *netdev = adapter->netdev;
 	int err;
 
 	/* PCI config space info */
@@ -2071,18 +2072,26 @@ static int ixgbevf_sw_init(struct ixgbevf_adapter *adapter)
 	err = hw->mac.ops.reset_hw(hw);
 	if (err) {
 		dev_info(&pdev->dev,
-		         "PF still in reset state, assigning new address\n");
-		eth_hw_addr_random(adapter->netdev);
-		memcpy(adapter->hw.mac.addr, adapter->netdev->dev_addr,
-			adapter->netdev->addr_len);
+			 "PF still in reset state.  Is the PF interface up?\n");
 	} else {
 		err = hw->mac.ops.init_hw(hw);
 		if (err) {
 			pr_err("init_shared_code failed: %d\n", err);
 			goto out;
 		}
-		memcpy(adapter->netdev->dev_addr, adapter->hw.mac.addr,
-		       adapter->netdev->addr_len);
+		err = hw->mac.ops.get_mac_addr(hw, hw->mac.addr);
+		if (err)
+			dev_info(&pdev->dev, "Error reading MAC address\n");
+		else if (is_zero_ether_addr(adapter->hw.mac.addr))
+			dev_info(&pdev->dev,
+				 "MAC address not assigned by administrator.\n");
+		memcpy(netdev->dev_addr, hw->mac.addr, netdev->addr_len);
+	}
+
+	if (!is_valid_ether_addr(netdev->dev_addr)) {
+		dev_info(&pdev->dev, "Assigning random MAC address\n");
+		eth_hw_addr_random(netdev);
+		memcpy(hw->mac.addr, netdev->dev_addr, netdev->addr_len);
 	}
 
 	/* lock to protect mailbox accesses */

drivers/net/ethernet/intel/ixgbevf/vf.c

@@ -109,7 +109,12 @@ static s32 ixgbevf_reset_hw_vf(struct ixgbe_hw *hw)
 	if (ret_val)
 		return ret_val;
 
-	if (msgbuf[0] != (IXGBE_VF_RESET | IXGBE_VT_MSGTYPE_ACK))
+	/* New versions of the PF may NACK the reset return message
+	 * to indicate that no MAC address has yet been assigned for
+	 * the VF.
+	 */
+	if (msgbuf[0] != (IXGBE_VF_RESET | IXGBE_VT_MSGTYPE_ACK) &&
+	    msgbuf[0] != (IXGBE_VF_RESET | IXGBE_VT_MSGTYPE_NACK))
 		return IXGBE_ERR_INVALID_MAC_ADDR;
 
 	memcpy(hw->mac.perm_addr, addr, ETH_ALEN);