[v2] ip_frag: hide internal structures

diff --git a/lib/ip_frag/ip_frag_common.h b/lib/ip_frag/ip_frag_common.h
index a17a74076c..9c0dbdeb6e 100644
--- a/lib/ip_frag/ip_frag_common.h
+++ b/lib/ip_frag/ip_frag_common.h
@@ -6,6 +6,7 @@ 
 #define _IP_FRAG_COMMON_H_
 
 #include "rte_ip_frag.h"
+#include "ip_reassembly.h"
 
 /* logging macros. */
 #ifdef RTE_LIBRTE_IP_FRAG_DEBUG
diff --git a/lib/ip_frag/ip_reassembly.h b/lib/ip_frag/ip_reassembly.h
new file mode 100644
index 0000000000..768a904a3f
--- /dev/null
+++ b/lib/ip_frag/ip_reassembly.h
@@ -0,0 +1,88 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2021 Intel Corporation
+ */
+
+#ifndef _IP_REASSEMBLY_H_
+#define _IP_REASSEMBLY_H_
+
+/*
+ * RTE IP Fragmentation and Reassembly
+ * Implementation of IP packet fragmentation and reassembly.
+ */
+
+#include <rte_ip_frag.h>
+
+enum {
+	IP_LAST_FRAG_IDX,    /**< index of last fragment */
+	IP_FIRST_FRAG_IDX,   /**< index of first fragment */
+	IP_MIN_FRAG_NUM,     /**< minimum number of fragments */
+	IP_MAX_FRAG_NUM = RTE_LIBRTE_IP_FRAG_MAX_FRAG,
+	/**< maximum number of fragments per packet */
+};
+
+/** @internal fragmented mbuf */
+struct ip_frag {
+	uint16_t ofs;          /**< offset into the packet */
+	uint16_t len;          /**< length of fragment */
+	struct rte_mbuf *mb;   /**< fragment mbuf */
+};
+
+/** @internal
+ * <src addr, dst_addr, id> to uniquely identify fragmented datagram.
+ */
+struct ip_frag_key {
+	uint64_t src_dst[4];
+	/**< src and dst address, only first 8 bytes used for IPv4 */
+	RTE_STD_C11
+	union {
+		uint64_t id_key_len; /**< combined for easy fetch */
+		__extension__
+		struct {
+			uint32_t id;       /**< packet id */
+			uint32_t key_len;  /**< src/dst key length */
+		};
+	};
+};
+
+/**
+ * @internal Fragmented packet to reassemble.
+ * First two entries in the frags[] array are for the last and first fragments.
+ */
+struct ip_frag_pkt {
+	RTE_TAILQ_ENTRY(ip_frag_pkt) lru; /**< LRU list */
+	struct ip_frag_key key;           /**< fragmentation key */
+	uint64_t             start;       /**< creation timestamp */
+	uint32_t             total_size;  /**< expected reassembled size */
+	uint32_t             frag_size;   /**< size of fragments received */
+	uint32_t             last_idx;    /**< index of next entry to fill */
+	struct ip_frag       frags[IP_MAX_FRAG_NUM]; /**< fragments */
+} __rte_cache_aligned;
+
+RTE_TAILQ_HEAD(ip_pkt_list, ip_frag_pkt); /**< @internal fragments tailq */
+
+/** fragmentation table statistics */
+struct ip_frag_tbl_stat {
+	uint64_t find_num;      /**< total # of find/insert attempts. */
+	uint64_t add_num;       /**< # of add ops. */
+	uint64_t del_num;       /**< # of del ops. */
+	uint64_t reuse_num;     /**< # of reuse (del/add) ops. */
+	uint64_t fail_total;    /**< total # of add failures. */
+	uint64_t fail_nospace;  /**< # of 'no space' add failures. */
+} __rte_cache_aligned;
+
+/** fragmentation table */
+struct rte_ip_frag_tbl {
+	uint64_t             max_cycles;     /**< ttl for table entries. */
+	uint32_t             entry_mask;     /**< hash value mask. */
+	uint32_t             max_entries;    /**< max entries allowed. */
+	uint32_t             use_entries;    /**< entries in use. */
+	uint32_t             bucket_entries; /**< hash associativity. */
+	uint32_t             nb_entries;     /**< total size of the table. */
+	uint32_t             nb_buckets;     /**< num of associativity lines. */
+	struct ip_frag_pkt *last;         /**< last used entry. */
+	struct ip_pkt_list lru;           /**< LRU list for table entries. */
+	struct ip_frag_tbl_stat stat;     /**< statistics counters. */
+	__extension__ struct ip_frag_pkt pkt[0]; /**< hash table. */
+};
+
+#endif /* _RTE_IP_REASSEMBLY_H_ */
diff --git a/lib/ip_frag/rte_ip_frag.h b/lib/ip_frag/rte_ip_frag.h
index 08555fde6a..b469bb5f4e 100644
--- a/lib/ip_frag/rte_ip_frag.h
+++ b/lib/ip_frag/rte_ip_frag.h
@@ -27,54 +27,11 @@  extern "C" {
 
 struct rte_mbuf;
 
-enum {
-	IP_LAST_FRAG_IDX,    /**< index of last fragment */
-	IP_FIRST_FRAG_IDX,   /**< index of first fragment */
-	IP_MIN_FRAG_NUM,     /**< minimum number of fragments */
-	IP_MAX_FRAG_NUM = RTE_LIBRTE_IP_FRAG_MAX_FRAG,
-	/**< maximum number of fragments per packet */
-};
-
-/** @internal fragmented mbuf */
-struct ip_frag {
-	uint16_t ofs;          /**< offset into the packet */
-	uint16_t len;          /**< length of fragment */
-	struct rte_mbuf *mb;   /**< fragment mbuf */
-};
-
-/** @internal <src addr, dst_addr, id> to uniquely identify fragmented datagram. */
-struct ip_frag_key {
-	uint64_t src_dst[4];
-	/**< src and dst address, only first 8 bytes used for IPv4 */
-	RTE_STD_C11
-	union {
-		uint64_t id_key_len; /**< combined for easy fetch */
-		__extension__
-		struct {
-			uint32_t id;       /**< packet id */
-			uint32_t key_len;  /**< src/dst key length */
-		};
-	};
-};
-
-/**
- * @internal Fragmented packet to reassemble.
- * First two entries in the frags[] array are for the last and first fragments.
- */
-struct ip_frag_pkt {
-	RTE_TAILQ_ENTRY(ip_frag_pkt) lru; /**< LRU list */
-	struct ip_frag_key key;           /**< fragmentation key */
-	uint64_t             start;       /**< creation timestamp */
-	uint32_t             total_size;  /**< expected reassembled size */
-	uint32_t             frag_size;   /**< size of fragments received */
-	uint32_t             last_idx;    /**< index of next entry to fill */
-	struct ip_frag       frags[IP_MAX_FRAG_NUM]; /**< fragments */
-} __rte_cache_aligned;
-
 #define IP_FRAG_DEATH_ROW_LEN 32 /**< death row size (in packets) */
 
 /* death row size in mbufs */
-#define IP_FRAG_DEATH_ROW_MBUF_LEN (IP_FRAG_DEATH_ROW_LEN * (IP_MAX_FRAG_NUM + 1))
+#define IP_FRAG_DEATH_ROW_MBUF_LEN \
+	(IP_FRAG_DEATH_ROW_LEN * (RTE_LIBRTE_IP_FRAG_MAX_FRAG + 1))
 
 /** mbuf death row (packets to be freed) */
 struct rte_ip_frag_death_row {
@@ -83,33 +40,6 @@  struct rte_ip_frag_death_row {
 	/**< mbufs to be freed */
 };
 
-RTE_TAILQ_HEAD(ip_pkt_list, ip_frag_pkt); /**< @internal fragments tailq */
-
-/** fragmentation table statistics */
-struct ip_frag_tbl_stat {
-	uint64_t find_num;      /**< total # of find/insert attempts. */
-	uint64_t add_num;       /**< # of add ops. */
-	uint64_t del_num;       /**< # of del ops. */
-	uint64_t reuse_num;     /**< # of reuse (del/add) ops. */
-	uint64_t fail_total;    /**< total # of add failures. */
-	uint64_t fail_nospace;  /**< # of 'no space' add failures. */
-} __rte_cache_aligned;
-
-/** fragmentation table */
-struct rte_ip_frag_tbl {
-	uint64_t             max_cycles;      /**< ttl for table entries. */
-	uint32_t             entry_mask;      /**< hash value mask. */
-	uint32_t             max_entries;     /**< max entries allowed. */
-	uint32_t             use_entries;     /**< entries in use. */
-	uint32_t             bucket_entries;  /**< hash associativity. */
-	uint32_t             nb_entries;      /**< total size of the table. */
-	uint32_t             nb_buckets;      /**< num of associativity lines. */
-	struct ip_frag_pkt *last;         /**< last used entry. */
-	struct ip_pkt_list lru;           /**< LRU list for table entries. */
-	struct ip_frag_tbl_stat stat;     /**< statistics counters. */
-	__extension__ struct ip_frag_pkt pkt[0]; /**< hash table. */
-};
-
 /* struct ipv6_extension_fragment moved to librte_net/rte_ip.h and renamed. */
 #define ipv6_extension_fragment	rte_ipv6_fragment_ext