igb: Warn on attempt to override administratively set MAC/VLAN

Print a warning message to the system log when the VF attempts to
override administratively set MAC/VLAN configuration.
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/igb/igb_main.c

@@ -5105,7 +5105,14 @@ static void igb_rcv_msg_from_vf(struct igb_adapter *adapter, u32 vf)
 
 	switch ((msgbuf[0] & 0xFFFF)) {
 	case E1000_VF_SET_MAC_ADDR:
-		retval = igb_set_vf_mac_addr(adapter, msgbuf, vf);
+		retval = -EINVAL;
+		if (!(vf_data->flags & IGB_VF_FLAG_PF_SET_MAC))
+			retval = igb_set_vf_mac_addr(adapter, msgbuf, vf);
+		else
+			dev_warn(&pdev->dev,
+				 "VF %d attempted to override administratively "
+				 "set MAC address\nReload the VF driver to "
+				 "resume operations\n", vf);
 		break;
 	case E1000_VF_SET_PROMISC:
 		retval = igb_set_vf_promisc(adapter, msgbuf, vf);
@@ -5117,8 +5124,12 @@ static void igb_rcv_msg_from_vf(struct igb_adapter *adapter, u32 vf)
 		retval = igb_set_vf_rlpml(adapter, msgbuf[1], vf);
 		break;
 	case E1000_VF_SET_VLAN:
-		if (adapter->vf_data[vf].pf_vlan)
-			retval = -1;
+		retval = -1;
+		if (vf_data->pf_vlan)
+			dev_warn(&pdev->dev,
+				 "VF %d attempted to override administratively "
+				 "set VLAN tag\nReload the VF driver to "
+				 "resume operations\n", vf);
 		else
 			retval = igb_set_vf_vlan(adapter, msgbuf, vf);
 		break;