ixgbevf: Return error on failure to enable VLAN

With recent kernel changes we can now return errors on a failure to setup a
VLAN filter.  This patch takes advantage of that opportunity so that we can
return either an EIO error in the case of a mailbox failure, or an EACCESS
error in the case of being denied access to the VLAN filter table by the
PF.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Robert Garrett <robertx.e.garrett@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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

@@ -1126,36 +1126,47 @@ static int ixgbevf_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
 {
 	struct ixgbevf_adapter *adapter = netdev_priv(netdev);
 	struct ixgbe_hw *hw = &adapter->hw;
+	int err;
+
+	if (!hw->mac.ops.set_vfta)
+		return -EOPNOTSUPP;
 
 	spin_lock(&adapter->mbx_lock);
 
 	/* add VID to filter table */
-	if (hw->mac.ops.set_vfta)
-		hw->mac.ops.set_vfta(hw, vid, 0, true);
+	err = hw->mac.ops.set_vfta(hw, vid, 0, true);
 
 	spin_unlock(&adapter->mbx_lock);
 
+	/* translate error return types so error makes sense */
+	if (err == IXGBE_ERR_MBX)
+		return -EIO;
+
+	if (err == IXGBE_ERR_INVALID_ARGUMENT)
+		return -EACCES;
+
 	set_bit(vid, adapter->active_vlans);
 
-	return 0;
+	return err;
 }
 
 static int ixgbevf_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
 {
 	struct ixgbevf_adapter *adapter = netdev_priv(netdev);
 	struct ixgbe_hw *hw = &adapter->hw;
+	int err = -EOPNOTSUPP;
 
 	spin_lock(&adapter->mbx_lock);
 
 	/* remove VID from filter table */
 	if (hw->mac.ops.set_vfta)
-		hw->mac.ops.set_vfta(hw, vid, 0, false);
+		err = hw->mac.ops.set_vfta(hw, vid, 0, false);
 
 	spin_unlock(&adapter->mbx_lock);
 
 	clear_bit(vid, adapter->active_vlans);
 
-	return 0;
+	return err;
 }
 
 static void ixgbevf_restore_vlan(struct ixgbevf_adapter *adapter)

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

@@ -349,16 +349,32 @@ static s32 ixgbevf_update_mc_addr_list_vf(struct ixgbe_hw *hw,
 static s32 ixgbevf_set_vfta_vf(struct ixgbe_hw *hw, u32 vlan, u32 vind,
 			       bool vlan_on)
 {
+	struct ixgbe_mbx_info *mbx = &hw->mbx;
 	u32 msgbuf[2];
+	s32 err;
 
 	msgbuf[0] = IXGBE_VF_SET_VLAN;
 	msgbuf[1] = vlan;
 	/* Setting the 8 bit field MSG INFO to TRUE indicates "add" */
 	msgbuf[0] |= vlan_on << IXGBE_VT_MSGINFO_SHIFT;
 
-	ixgbevf_write_msg_read_ack(hw, msgbuf, 2);
+	err = mbx->ops.write_posted(hw, msgbuf, 2);
+	if (err)
+		goto mbx_err;
 
-	return 0;
+	err = mbx->ops.read_posted(hw, msgbuf, 2);
+	if (err)
+		goto mbx_err;
+
+	/* remove extra bits from the message */
+	msgbuf[0] &= ~IXGBE_VT_MSGTYPE_CTS;
+	msgbuf[0] &= ~(0xFF << IXGBE_VT_MSGINFO_SHIFT);
+
+	if (msgbuf[0] != (IXGBE_VF_SET_VLAN | IXGBE_VT_MSGTYPE_ACK))
+		err = IXGBE_ERR_INVALID_ARGUMENT;
+
+mbx_err:
+	return err;
 }
 
 /**