diff --git a/include/odp/api/spec/packet.h b/include/odp/api/spec/packet.h
index 4a86eba..0791496 100644
--- a/include/odp/api/spec/packet.h
+++ b/include/odp/api/spec/packet.h
@@ -256,6 +256,20 @@ uint32_t odp_packet_seg_len(odp_packet_t pkt);
 uint32_t odp_packet_len(odp_packet_t pkt);
 
 /**
+ * Packet unshared data len
+ *
+ * Returns the sum of data lengths over all unshared packet segments. These
+ * are the only bytes that should be modified by the caller. The rest of the
+ * packet should be treated as read only. odp_packet_unshared_len() will be
+ * equal to odp_packet_len() if odp_packet_has_ref() is 0.
+ *
+ * @param pkt Packet handle
+ *
+ * @return Packet unshared data length
+ */
+uint32_t odp_packet_unshared_len(odp_packet_t pkt);
+
+/**
  * Packet headroom length
  *
  * Returns the current packet level headroom length.
@@ -795,7 +809,7 @@ uint32_t odp_packet_seg_data_len(odp_packet_t pkt, odp_packet_seg_t seg);
  * data pointers. Otherwise, all old pointers remain valid.
  *
  * The resulting packet is always allocated from the same pool as
- * the destination packet. The source packet may have been allocate from
+ * the destination packet. The source packet may have been allocated from
  * any pool.
  *
  * On failure, both handles remain valid and packets are not modified.
@@ -848,6 +862,180 @@ int odp_packet_split(odp_packet_t *pkt, uint32_t len, odp_packet_t *tail);
 
 /*
  *
+ * References
+ * ********************************************************
+ *
+ */
+
+/**
+ * Create a static reference to a packet
+ *
+ * A static reference is used to obtain an additional handle for referring to
+ * a packet so that the storage behind it is not freed until all references to
+ * the packet are freed. This can be used, for example, to support efficient
+ * retransmission processing.
+ *
+ * The intent of a static reference is that both the packet and the returned
+ * reference to it will be treated as read only after this call. Results are
+ * undefined if this restriction is not observed.
+ *
+ * Static references have restrictions but may have performance advantages on
+ * some platforms if the caller does not intend to modify the reference
+ * packet. If modification is needed (e.g., to prefix a unique header onto the
+ * packet) then odp_packet_ref() or odp_packet_ref_pkt() should be used.
+ *
+ * @param pkt    Handle of the packet for which a static reference is
+ *               to be created.
+ *
+ * @return                    Handle of the static reference packet
+ * @retval ODP_PACKET_INVALID Operation failed. pkt remains unchanged.
+ */
+odp_packet_t odp_packet_ref_static(odp_packet_t pkt);
+
+/**
+ * Create a reference to a packet
+ *
+ * Create a dynamic reference to a packet starting at a specified byte
+ * offset. This reference may be used as an argument to header manipulation
+ * APIs to prefix a unique header onto the shared base. The storage associated
+ * with the referenced packet is not freed until all references to it are
+ * freed, which permits easy multicasting or retransmission processing to be
+ * performed. Following a successful call, the shared portions of the
+ * referenced packet packet should be treated as read only. Results are
+ * undefined if this restriction is not observed.
+ *
+ * This operation logically prepends a zero-length header onto the referenced
+ * packet beginning at the specified offset. This header is always drawn from
+ * the same pool as the referenced packet.
+ *
+ * Because references are unique packets, any bytes pushed onto the head of a
+ * reference via odp_packet_push_head() or odp_packet_extend_head() are unique
+ * to this reference and are not seen by the referenced packet or by any other
+ * reference to the same packet. Similarly, any bytes pushed onto the
+ * head of the referenced packet are not visible to any reference created
+ * prior to the push operation.
+ *
+ * Note that the existence of references does not in any way change the
+ * requirement that a single packet handle may only be manipulated by one
+ * thread at a time.  The odp_packet_unshared_len() API may be used to
+ * determine the number of bytes starting at offset zero that are unique to
+ * this packet handle. Only these bytes should be considered modifiable. All
+ * other bytes accessible from this handle should be treated as read only.
+ *
+ * The packet used as input to this routine may itself by a reference to
+ * some other packet. Implementations MAY restrict the ability to create
+ * such compound references. Attempts to exceed any implementation limits in
+ * this regard will result in this call failing and returning
+ * ODP_PACKET_INVALID.
+ *
+ * If the caller does not indend to push a header onto either the returned
+ * reference or the packet being referenced, or otherwise modify either
+ * packet, the odp_packet_ref_static() API may be used. This may be a more
+ * efficient means of obtaining another reference to a packet if both will be
+ * treated as read only.
+ *
+ * @param pkt    Handle of the packet for which a reference is to be
+ *               created.
+ *
+ * @param offset Byte offset in pkt at which the shared reference is to
+ *               begin. This must be in the range 0..odp_packet_len(pkt)-1.
+ *
+ * @return                    Handle of the reference packet
+ * @retval ODP_PACKET_INVALID Operation failed. pkt remains unchanged.
+ *
+
+ */
+odp_packet_t odp_packet_ref(odp_packet_t pkt, uint32_t offset);
+
+/**
+ * Create a reference to another packet from a header packet
+ *
+ * Create a dynamic reference to a packet starting at a specified byte offset
+ * by prepending a supplied header packet. The resulting reference consists of
+ * the unshared header followed by the shared referenced packet starting at
+ * the specified offset. This shared portion should be regarded as read
+ * only. The storage associated with the shared portion of the reference is
+ * not freed until all references to it are freed, which permits easy
+ * multicasting or retransmission processing to be performed.
+ *
+ * Because references are unique packets, any bytes pushed onto the head of a
+ * reference via odp_packet_push_head() or odp_packet_extend_head() are unique
+ * to this reference and are not seen by the referenced packet or by any other
+ * reference to the same packet. Similarly, any bytes pushed onto the
+ * head of the referenced packet are not visible to any reference created
+ * prior to the push operation.
+ *
+ * Note that the existence of references does not in any way change the
+ * requirement that a single packet handle may only be manipulated by one
+ * thread at a time.  The odp_packet_unshared_len() API may be used to
+ * determine the number of bytes starting at offset zero that are unique to
+ * this packet handle. Only these bytes should be considered modifiable. All
+ * other bytes accessible from this handle should be treated as read only.
+ *
+ * Either packet input to this routine may itself be a reference, however
+ * individual implementations MAY impose limits on how deeply references may be
+ * nested and fail the call if those limits are exceeded.
+ *
+ * The packets used as input to this routine may reside in different pools,
+ * however individual implementations MAY require that both reside in the same
+ * pool and fail the call if this restriction is not observed. For best
+ * portability, both should reside in the same pool.
+ *
+ * odp_packet_pool() on the returned reference returns the pool id of the
+ * header packet.
+ *
+ * @param pkt    Handle of the packet for which a reference is to be
+ *               created.
+ *
+ * @param offset Byte offset in pkt at which the shared reference is to
+ *               begin. Must be in the range 0..odp_packet_len(pkt)-1.
+ *
+ * @param hdr    Handle of the header packet to be prefixed onto pkt to create
+ *               the reference. If this is specified as ODP_PACKET_INVALID,
+ *               this call is equivalent to odp_packet_ref(). The supplied hdr
+ *               must be distinct from pkt and results are undefined if an
+ *               attempt is made to create circular references.
+ *
+ * @return       Handle of the reference packet. This may or may not be the
+ *               same as the input hdr packet. The caller should only use this
+ *               handle since the original hdr packet no longer has any
+ *               independent existence.
+ *
+ * @retval ODP_PACKET_INVALID Operation failed. Both pkt and hdr are unchanged.
+ */
+odp_packet_t odp_packet_ref_pkt(odp_packet_t pkt, uint32_t offset,
+				odp_packet_t hdr);
+
+/**
+ * Test if a packet is a reference
+ *
+ * A packet is a reference if it was created by odp_packet_ref() or
+ * odp_packet_ref_pkt(). Note that a reference created from another
+ * reference is considered a compound reference. Calls on such packets will
+ * result in return values greater than 1.
+ *
+ * @param pkt Packet handle
+ *
+ * @retval 0  Packet is not a reference
+ * @retval >0 Packet is a reference consisting of N individual packets.
+ */
+int odp_packet_is_ref(odp_packet_t pkt);
+
+/**
+ * Test if a packet has a reference
+ *
+ * A packet has a reference if a reference was created to it by
+ * odp_packet_ref_static(), odp_packet_ref(), or odp_packet_ref_pkt().
+ *
+ * @param pkt Packet handle
+ *
+ * @retval 0  Packet does not have any references
+ * @retval >0 Packet has N references to it
+ */
+int odp_packet_has_ref(odp_packet_t pkt);
+
+/*
+ *
  * Copy
  * ********************************************************
  *
