vdpa/mlx5: update MAC address handling in mlx5_vdpa_set_attr()

Improve MAC address handling in mlx5_vdpa_set_attr() to ensure that
old MAC entries are properly removed from the MPFS table before
adding a new one. The new MAC address is then added to both the MPFS
and VLAN tables.

This change fixes an issue where the updated MAC address would not
take effect until QEMU was rebooted.

Signed-off-by: Cindy Lu <lulu@redhat.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20260126094848.9601-4-lulu@redhat.com>

Author: Cindy Lu

drivers/vdpa/mlx5/net/mlx5_vnet.c

@@ -4052,17 +4052,15 @@ static void mlx5_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *
 static int mlx5_vdpa_set_attr(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *dev,
 			      const struct vdpa_dev_set_config *add_config)
 {
-	struct virtio_net_config *config;
 	struct mlx5_core_dev *pfmdev;
 	struct mlx5_vdpa_dev *mvdev;
 	struct mlx5_vdpa_net *ndev;
 	struct mlx5_core_dev *mdev;
-	int err = 0;
+	int err = -EOPNOTSUPP;
 
 	mvdev = to_mvdev(dev);
 	ndev = to_mlx5_vdpa_ndev(mvdev);
 	mdev = mvdev->mdev;
-	config = &ndev->config;
 
 	down_write(&ndev->reslock);
 
@@ -4075,9 +4073,8 @@ static int mlx5_vdpa_set_attr(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *
 			goto out;
 		}
 		pfmdev = pci_get_drvdata(pci_physfn(mdev->pdev));
-		err = mlx5_mpfs_add_mac(pfmdev, config->mac);
-		if (!err)
-			ether_addr_copy(config->mac, add_config->net.mac);
+		err = mlx5_vdpa_change_mac(ndev, pfmdev,
+					   (u8 *)add_config->net.mac);
 	}
 
 out: