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diff --git a/src/vlib/defs.h b/src/vlib/defs.h
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+/*
+ * Copyright (c) 2015 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.
+ */
+/*
+ * defs.h: VLIB generic C definitions
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef included_vlib_defs_h
+#define included_vlib_defs_h
+
+/* Receive or transmit. */
+typedef enum
+{
+  VLIB_RX,
+  VLIB_TX,
+  VLIB_N_RX_TX = 2,		/* Used to size arrays. */
+} vlib_rx_or_tx_t;
+
+#define vlib_foreach_rx_tx(v) for (v = 0; v < VLIB_N_RX_TX; v++)
+
+/* Read/write. */
+typedef enum
+{
+  VLIB_READ,
+  VLIB_WRITE,
+} vlib_read_or_write_t;
+
+/* Up/down. */
+typedef enum
+{
+  VLIB_DOWN = 0,
+  VLIB_UP = 1,
+} vlib_up_or_down_t;
+
+/* Enable/disable. */
+typedef enum
+{
+  VLIB_DISABLE = 0,
+  VLIB_ENABLE = 1,
+} vlib_enable_or_disable_t;
+
+#endif /* included_vlib_defs_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */