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diff --git a/src/vnet/pg/pg.api b/src/vnet/pg/pg.api
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+/*
+ * Copyright (c) 2015-2016 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.
+ */
+
+/** \file
+
+    This file defines packet-generator interface APIs.
+*/
+
+vl_api_version 1.0.0
+
+/** \brief PacketGenerator create interface request
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param interface_id - interface index
+*/
+define pg_create_interface
+{
+  u32 client_index;
+  u32 context;
+  u32 interface_id;
+};
+
+/** \brief PacketGenerator create interface response
+    @param context - sender context, to match reply w/ request
+    @param retval - return value for request
+*/
+define pg_create_interface_reply
+{
+  u32 context;
+  i32 retval;
+  u32 sw_if_index;
+};
+
+/** \brief PacketGenerator capture packets on given interface request
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param interface_id - pg interface index
+    @param is_enabled - 1 if enabling streams, 0 if disabling
+    @param count - number of packets to be captured
+    @param pcap_file - pacp file name to store captured packets
+*/
+autoreply define pg_capture
+{
+  u32 client_index;
+  u32 context;
+  u32 interface_id;
+  u8 is_enabled;
+  u32 count;
+  u32 pcap_name_length;
+  u8 pcap_file_name[pcap_name_length];
+};
+
+/** \brief Enable / disable packet generator request
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param is_enabled - 1 if enabling streams, 0 if disabling
+    @param stream - stream name to be enable/disabled, if not specified handle all streams
+*/
+autoreply define pg_enable_disable
+{
+  u32 client_index;
+  u32 context;
+  u8 is_enabled;
+  u32 stream_name_length;
+  u8 stream_name[stream_name_length];
+};
+
+/*
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */