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diff --git a/src/vnet/dpo/interface_tx_dpo.h b/src/vnet/dpo/interface_tx_dpo.h
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+++ b/src/vnet/dpo/interface_tx_dpo.h
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+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @brief
+ * The data-path object representing transmitting the packet on a n interface.
+ * This is a convenient DPO wrapper around a simple interface transmit and thus
+ * allows us to represent direct interface transmit in the DPO model.
+ */
+
+#ifndef __INTERFACE_TX_DPO_H__
+#define __INTERFACE_TX_DPO_H__
+
+#include <vnet/dpo/dpo.h>
+
+extern void interface_tx_dpo_add_or_lock (dpo_proto_t proto,
+                                          u32 sw_if_index,
+                                          dpo_id_t *dpo);
+
+extern void interface_tx_dpo_module_init(void);
+
+#endif