+static int tbl_mask_array_add_mask(struct flow_table *tbl,
+ struct sw_flow_mask *new)
+{
+ struct mask_array *ma = ovsl_dereference(tbl->mask_array);
+ int err, ma_count = READ_ONCE(ma->count);
+
+ if (ma_count >= ma->max) {
+ err = tbl_mask_array_realloc(tbl, ma->max +
+ MASK_ARRAY_SIZE_MIN);
+ if (err)
+ return err;
+
+ ma = ovsl_dereference(tbl->mask_array);
+ }
+
+ BUG_ON(ovsl_dereference(ma->masks[ma_count]));
+
+ rcu_assign_pointer(ma->masks[ma_count], new);
+ WRITE_ONCE(ma->count, ma_count +1);
+
+ return 0;
+}
+
+static void tbl_mask_array_del_mask(struct flow_table *tbl,
+ struct sw_flow_mask *mask)
+{
+ struct mask_array *ma = ovsl_dereference(tbl->mask_array);
+ int i, ma_count = READ_ONCE(ma->count);
+
+ /* Remove the deleted mask pointers from the array */
+ for (i = 0; i < ma_count; i++) {
+ if (mask == ovsl_dereference(ma->masks[i]))
+ goto found;
+ }
+
+ BUG();
+ return;
+
+found:
+ WRITE_ONCE(ma->count, ma_count -1);
+
+ rcu_assign_pointer(ma->masks[i], ma->masks[ma_count -1]);
+ RCU_INIT_POINTER(ma->masks[ma_count -1], NULL);
+
+ kfree_rcu(mask, rcu);
+
+ /* Shrink the mask array if necessary. */
+ if (ma->max >= (MASK_ARRAY_SIZE_MIN * 2) &&
+ ma_count <= (ma->max / 3))
+ tbl_mask_array_realloc(tbl, ma->max / 2);
+}
+
+/* Remove 'mask' from the mask list, if it is not needed any more. */
+static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask)
+{
+ if (mask) {
+ /* ovs-lock is required to protect mask-refcount and
+ * mask list.
+ */
+ ASSERT_OVSL();
+ BUG_ON(!mask->ref_count);
+ mask->ref_count--;
+
+ if (!mask->ref_count)
+ tbl_mask_array_del_mask(tbl, mask);
+ }
+}
+