ixgbe: Allow setting zero MAC address for VF

Currently, there is no logic that allows a VF's MAC address to be removed
from the RAR table.

Allow the user to specify a zero MAC address in order to clear the VF's
MAC address from the RAR table.  This functionality is also utilized by
libvirt when removing VFs.

Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index c45de53300aa9d397840ef6a250d040fe704ec67..58897d97412e7dc636ef6978f80dff1fc986a4fd 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -1347,18 +1347,26 @@ void ixgbe_ping_all_vfs(struct ixgbe_adapter *adapter)
 int ixgbe_ndo_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
 {
        struct ixgbe_adapter *adapter = netdev_priv(netdev);
-       if (!is_valid_ether_addr(mac) || (vf >= adapter->num_vfs))
+
+       if (vf >= adapter->num_vfs)
+               return -EINVAL;
+
+       if (is_zero_ether_addr(mac)) {
+               adapter->vfinfo[vf].pf_set_mac = false;
+               dev_info(&adapter->pdev->dev, "removing MAC on VF %d\n", vf);
+       } else if (is_valid_ether_addr(mac)) {
+               adapter->vfinfo[vf].pf_set_mac = true;
+               dev_info(&adapter->pdev->dev, "setting MAC %pM on VF %d\n",
+                        mac, vf);
+               dev_info(&adapter->pdev->dev, "Reload the VF driver to make this change effective.");
+               if (test_bit(__IXGBE_DOWN, &adapter->state)) {
+                       dev_warn(&adapter->pdev->dev, "The VF MAC address has been set, but the PF device is not up.\n");
+                       dev_warn(&adapter->pdev->dev, "Bring the PF device up before attempting to use the VF device.\n");
+               }
+       } else {
                return -EINVAL;
-       adapter->vfinfo[vf].pf_set_mac = true;
-       dev_info(&adapter->pdev->dev, "setting MAC %pM on VF %d\n", mac, vf);
-       dev_info(&adapter->pdev->dev, "Reload the VF driver to make this"
-                                     " change effective.");
-       if (test_bit(__IXGBE_DOWN, &adapter->state)) {
-               dev_warn(&adapter->pdev->dev, "The VF MAC address has been set,"
-                        " but the PF device is not up.\n");
-               dev_warn(&adapter->pdev->dev, "Bring the PF device up before"
-                        " attempting to use the VF device.\n");
        }
+
        return ixgbe_set_vf_mac(adapter, vf, mac);
 }