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diff --git a/src/svm/fifo_types.h b/src/svm/fifo_types.h
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+/*
+ * Copyright (c) 2020 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_SVM_FIFO_TYPES_H_
+#define SRC_SVM_FIFO_TYPES_H_
+
+#include <svm/ssvm.h>
+#include <vppinfra/clib.h>
+#include <vppinfra/rbtree.h>
+
+#define SVM_FIFO_TRACE 			(0)
+#define SVM_FIFO_MAX_EVT_SUBSCRIBERS	7
+
+typedef struct fifo_segment_header_ fifo_segment_header_t;
+
+typedef struct svm_fifo_chunk_
+{
+  u32 start_byte;		/**< chunk start byte */
+  u32 length;			/**< length of chunk in bytes */
+  struct svm_fifo_chunk_ *next;	/**< pointer to next chunk in linked-lists */
+  rb_node_index_t enq_rb_index;	/**< enq node index if chunk in rbtree */
+  rb_node_index_t deq_rb_index;	/**< deq node index if chunk in rbtree */
+  u8 data[0];			/**< start of chunk data */
+} svm_fifo_chunk_t;
+
+typedef struct
+{
+  u32 next;	/**< Next linked-list element pool index */
+  u32 prev;	/**< Previous linked-list element pool index */
+  u32 start;	/**< Start of segment, normalized*/
+  u32 length;	/**< Length of segment */
+} ooo_segment_t;
+
+typedef struct
+{
+  u32 offset;
+  u32 len;
+  u32 action;
+} svm_fifo_trace_elem_t;
+
+typedef struct _svm_fifo
+{
+  CLIB_CACHE_LINE_ALIGN_MARK (shared_first);
+  fifo_segment_header_t *fs_hdr;/**< fifo segment header for fifo */
+  svm_fifo_chunk_t *start_chunk;/**< first chunk in fifo chunk list */
+  svm_fifo_chunk_t *end_chunk;	/**< end chunk in fifo chunk list */
+  u32 min_alloc;		/**< min chunk alloc if space available */
+  u32 size;			/**< size of the fifo in bytes */
+  u8 flags;			/**< fifo flags */
+  u8 slice_index;		/**< segment slice for fifo */
+
+    CLIB_CACHE_LINE_ALIGN_MARK (shared_second);
+  volatile u32 has_event;	/**< non-zero if deq event exists */
+  u32 master_session_index;	/**< session layer session index */
+  u32 client_session_index;	/**< app session index */
+  u8 master_thread_index;	/**< session layer thread index */
+  u8 client_thread_index;	/**< app worker index */
+  i8 refcnt;			/**< reference count  */
+  u32 segment_manager;		/**< session layer segment manager index */
+  u32 segment_index;		/**< segment index in segment manager */
+  struct _svm_fifo *next;	/**< next in freelist/active chain */
+  struct _svm_fifo *prev;	/**< prev in active chain */
+
+    CLIB_CACHE_LINE_ALIGN_MARK (consumer);
+  rb_tree_t ooo_deq_lookup;	/**< rbtree for ooo deq chunk lookup */
+  svm_fifo_chunk_t *head_chunk;	/**< tracks chunk where head lands */
+  svm_fifo_chunk_t *ooo_deq;	/**< last chunk used for ooo dequeue */
+  u32 head;			/**< fifo head position/byte */
+  volatile u32 want_deq_ntf;	/**< producer wants nudge */
+  volatile u32 has_deq_ntf;
+
+    CLIB_CACHE_LINE_ALIGN_MARK (producer);
+  rb_tree_t ooo_enq_lookup;	/**< rbtree for ooo enq chunk lookup */
+  u32 tail;			/**< fifo tail position/byte */
+  u32 ooos_list_head;		/**< Head of out-of-order linked-list */
+  svm_fifo_chunk_t *tail_chunk;	/**< tracks chunk where tail lands */
+  svm_fifo_chunk_t *ooo_enq;	/**< last chunk used for ooo enqueue */
+  ooo_segment_t *ooo_segments;	/**< Pool of ooo segments */
+  u32 ooos_newest;		/**< Last segment to have been updated */
+  volatile u8 n_subscribers;	/**< Number of subscribers for io events */
+  u8 subscribers[SVM_FIFO_MAX_EVT_SUBSCRIBERS];
+
+#if SVM_FIFO_TRACE
+  svm_fifo_trace_elem_t *trace;
+#endif
+
+} svm_fifo_t;
+
+typedef struct fifo_segment_slice_
+{
+  svm_fifo_t *fifos;			/**< Linked list of active RX fifos */
+  svm_fifo_t *free_fifos;		/**< Freelists by fifo size  */
+  svm_fifo_chunk_t **free_chunks;	/**< Freelists by chunk size */
+  uword n_fl_chunk_bytes;		/**< Chunk bytes on freelist */
+  clib_spinlock_t chunk_lock;
+} fifo_segment_slice_t;
+
+struct fifo_segment_header_
+{
+  fifo_segment_slice_t *slices;		/** Fixed array of slices */
+  ssvm_shared_header_t *ssvm_sh;	/**< Pointer to fs ssvm shared hdr */
+  uword n_free_bytes;			/**< Segment free bytes */
+  u32 n_active_fifos;			/**< Number of active fifos */
+  u32 n_reserved_bytes;			/**< Bytes not to be allocated */
+  u32 max_log2_chunk_size;		/**< Max log2(chunk size) for fs */
+  u8 flags;				/**< Segment flags */
+  u8 n_slices;				/**< Number of slices */
+};
+
+#endif /* SRC_SVM_FIFO_TYPES_H_ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */