1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/net/mlx4/port.c b/drivers/net/mlx4/port.c
index 606aa58afdea..56371ef328ef 100644
--- a/drivers/net/mlx4/port.c
+++ b/drivers/net/mlx4/port.c
@@ -182,6 +182,25 @@ static int mlx4_set_port_vlan_table(struct mlx4_dev *dev, u8 port,
         return err;
 }
 
+int mlx4_find_cached_vlan(struct mlx4_dev *dev, u8 port, u16 vid, int *idx)
+{
+        struct mlx4_vlan_table *table = &mlx4_priv(dev)->port[port].vlan_table;
+        int i;
+
+        for (i = 0; i < MLX4_MAX_VLAN_NUM; ++i) {
+                if (table->refs[i] &&
+                    (vid == (MLX4_VLAN_MASK &
+                              be32_to_cpu(table->entries[i])))) {
+                        /* VLAN already registered, increase reference count */
+                        *idx = i;
+                        return 0;
+                }
+        }
+
+        return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(mlx4_find_cached_vlan);
+
 int mlx4_register_vlan(struct mlx4_dev *dev, u8 port, u16 vlan, int *index)
 {
         struct mlx4_vlan_table *table = &mlx4_priv(dev)->port[port].vlan_table;