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diff --git a/src/vnet/session/segment_manager.h b/src/vnet/session/segment_manager.h
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+/*
+ * Copyright (c) 2017 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.
+ */
+#ifndef SRC_VNET_SESSION_SEGMENT_MANAGER_H_
+#define SRC_VNET_SESSION_SEGMENT_MANAGER_H_
+
+#include <vnet/vnet.h>
+#include <svm/svm_fifo_segment.h>
+
+typedef struct _segment_manager_properties
+{
+  /** Session fifo sizes.  */
+  u32 rx_fifo_size;
+  u32 tx_fifo_size;
+
+  /** Configured additional segment size */
+  u32 add_segment_size;
+
+  /** Flag that indicates if additional segments should be created */
+  u8 add_segment;
+
+} segment_manager_properties_t;
+
+typedef struct _segment_manager
+{
+  /** segments mapped by this manager */
+  u32 *segment_indices;
+
+  /** Owner app index */
+  u32 app_index;
+
+  /** Pointer to manager properties. Could be shared among all of
+   * an app's segment managers s*/
+  segment_manager_properties_t *properties;
+} segment_manager_t;
+
+/** Pool of segment managers */
+extern segment_manager_t *segment_managers;
+
+always_inline segment_manager_t *
+segment_manager_new ()
+{
+  segment_manager_t *sm;
+  pool_get (segment_managers, sm);
+  memset (sm, 0, sizeof (*sm));
+  return sm;
+}
+
+always_inline segment_manager_t *
+segment_manager_get (u32 index)
+{
+  return pool_elt_at_index (segment_managers, index);
+}
+
+always_inline segment_manager_t *
+segment_manager_get_if_valid (u32 index)
+{
+  if (pool_is_free_index (segment_managers, index))
+    return 0;
+  return pool_elt_at_index (segment_managers, index);
+}
+
+always_inline u32
+segment_manager_index (segment_manager_t * sm)
+{
+  return sm - segment_managers;
+}
+
+int
+segment_manager_init (segment_manager_t * sm,
+		      segment_manager_properties_t * properties,
+		      u32 seg_size);
+
+void segment_manager_get_segment_info (u32 index, u8 ** name, u32 * size);
+int
+session_manager_add_first_segment (segment_manager_t * sm, u32 segment_size);
+int session_manager_add_segment (segment_manager_t * sm);
+void segment_manager_del (segment_manager_t * sm);
+int
+segment_manager_alloc_session_fifos (segment_manager_t * sm,
+				     svm_fifo_t ** server_rx_fifo,
+				     svm_fifo_t ** server_tx_fifo,
+				     u32 * fifo_segment_index);
+void
+segment_manager_dealloc_fifos (u32 svm_segment_index, svm_fifo_t * rx_fifo,
+			       svm_fifo_t * tx_fifo);
+
+#endif /* SRC_VNET_SESSION_SEGMENT_MANAGER_H_ */
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */