[PATCH] gro : ipv6 changes to support GRO for TCP/ipv6

[Kumara Parameshwaran <kumaraparamesh92@gmail.com>]

From: Kumara Parameshwaran <kumaraparamesh92@gmail.com>

The patch adds GRO support for TCP/ipv6 packets. This does not
include the support for vxlan, udp ipv6 packets.

Signed-off-by: Kumara Parameshwaran <kumaraparamesh92@gmail.com>
---
v1:
	* Changes to support GRO for TCP/ipv6 packets. This does not include
	  vxlan changes. 
	* The GRO is performed only for ipv6 packets that does not contain 
	 extension headers. 
	* The logic for the TCP coalescing remains the same, in ipv6 header 
	  the source address, destination address, flow label, version fields 
	  are expected to be the same. 
	* Re-organised the code to reuse certain tcp functions for both ipv4 and 
	  ipv6 flows.

 lib/gro/gro_tcp.h        | 155 ++++++++++++++++
 lib/gro/gro_tcp4.c       |   7 +-
 lib/gro/gro_tcp4.h       | 152 +--------------
 lib/gro/gro_tcp6.c       | 388 +++++++++++++++++++++++++++++++++++++++
 lib/gro/gro_tcp6.h       | 150 +++++++++++++++
 lib/gro/gro_vxlan_tcp4.c |   3 +-
 lib/gro/gro_vxlan_tcp4.h |   3 +-
 lib/gro/meson.build      |   1 +
 lib/gro/rte_gro.c        |  86 +++++++--
 lib/gro/rte_gro.h        |   3 +
 10 files changed, 777 insertions(+), 171 deletions(-)
 create mode 100644 lib/gro/gro_tcp.h
 create mode 100644 lib/gro/gro_tcp6.c
 create mode 100644 lib/gro/gro_tcp6.h

diff --git a/lib/gro/gro_tcp.h b/lib/gro/gro_tcp.h
new file mode 100644
index 0000000000..16bce9d098
--- /dev/null
+++ b/lib/gro/gro_tcp.h
@@ -0,0 +1,155 @@
+#ifndef _GRO_TCP_H_
+#define _GRO_TCP_H_
+
+#include <rte_tcp.h>
+
+/*
+ * The max length of a IPv4 packet, which includes the length of the L3
+ * header, the L4 header and the data payload.
+ */
+#define MAX_IP_PKT_LENGTH UINT16_MAX
+
+/* The maximum TCP header length */
+#define MAX_TCP_HLEN 60
+#define INVALID_TCP_HDRLEN(len) \
+	(((len) < sizeof(struct rte_tcp_hdr)) || ((len) > MAX_TCP_HLEN))
+
+struct gro_tcp_item {
+	/*
+	 * The first MBUF segment of the packet. If the value
+	 * is NULL, it means the item is empty.
+	 */
+	struct rte_mbuf *firstseg;
+	/* The last MBUF segment of the packet */
+	struct rte_mbuf *lastseg;
+	/*
+	 * The time when the first packet is inserted into the table.
+	 * This value won't be updated, even if the packet is merged
+	 * with other packets.
+	 */
+	uint64_t start_time;
+	/*
+	 * next_pkt_idx is used to chain the packets that
+	 * are in the same flow but can't be merged together
+	 * (e.g. caused by packet reordering).
+	 */
+	uint32_t next_pkt_idx;
+	/* TCP sequence number of the packet */
+	uint32_t sent_seq;
+	/* IPv4 ID of the packet */
+	uint16_t ip_id;
+	/* the number of merged packets */
+	uint16_t nb_merged;
+	/* Indicate if IPv4 ID can be ignored */
+	uint8_t is_atomic;
+};
+
+/*
+ * Merge two TCP packets without updating checksums.
+ * If cmp is larger than 0, append the new packet to the
+ * original packet. Otherwise, pre-pend the new packet to
+ * the original packet.
+ */
+static inline int
+merge_two_tcp_packets(struct gro_tcp_item *item,
+		struct rte_mbuf *pkt,
+		int cmp,
+		uint32_t sent_seq,
+		uint16_t ip_id,
+		uint16_t l2_offset)
+{
+	struct rte_mbuf *pkt_head, *pkt_tail, *lastseg;
+	uint16_t hdr_len, l2_len;
+
+	if (cmp > 0) {
+		pkt_head = item->firstseg;
+		pkt_tail = pkt;
+	} else {
+		pkt_head = pkt;
+		pkt_tail = item->firstseg;
+	}
+
+	/* check if the IPv4 packet length is greater than the max value */
+	hdr_len = l2_offset + pkt_head->l2_len + pkt_head->l3_len +
+		pkt_head->l4_len;
+	l2_len = l2_offset > 0 ? pkt_head->outer_l2_len : pkt_head->l2_len;
+	if (unlikely(pkt_head->pkt_len - l2_len + pkt_tail->pkt_len -
+				hdr_len > MAX_IP_PKT_LENGTH))
+		return 0;
+
+	/* remove the packet header for the tail packet */
+	rte_pktmbuf_adj(pkt_tail, hdr_len);
+
+	/* chain two packets together */
+	if (cmp > 0) {
+		item->lastseg->next = pkt;
+		item->lastseg = rte_pktmbuf_lastseg(pkt);
+		/* update IP ID to the larger value */
+		item->ip_id = ip_id;
+	} else {
+		lastseg = rte_pktmbuf_lastseg(pkt);
+		lastseg->next = item->firstseg;
+		item->firstseg = pkt;
+		/* update sent_seq to the smaller value */
+		item->sent_seq = sent_seq;
+		item->ip_id = ip_id;
+	}
+	item->nb_merged++;
+
+	/* update MBUF metadata for the merged packet */
+	pkt_head->nb_segs += pkt_tail->nb_segs;
+	pkt_head->pkt_len += pkt_tail->pkt_len;
+
+	return 1;
+}
+
+/*
+ * Check if two TCP/IPv4 packets are neighbors.
+ */
+static inline int
+check_seq_option(struct gro_tcp_item *item,
+		struct rte_tcp_hdr *tcph,
+		uint32_t sent_seq,
+		uint16_t ip_id,
+		uint16_t tcp_hl,
+		uint16_t tcp_dl,
+		uint16_t l2_offset,
+		uint8_t is_atomic)
+{
+	struct rte_mbuf *pkt_orig = item->firstseg;
+	char *iph_orig;
+	struct rte_tcp_hdr *tcph_orig;
+	uint16_t len, tcp_hl_orig;
+
+	iph_orig = (char *)(rte_pktmbuf_mtod(pkt_orig, char *) + 
+                l2_offset + pkt_orig->l2_len);
+	tcph_orig = (struct rte_tcp_hdr *)(iph_orig + pkt_orig->l3_len);
+	tcp_hl_orig = pkt_orig->l4_len;
+
+	/* Check if TCP option fields equal */
+	len = RTE_MAX(tcp_hl, tcp_hl_orig) - sizeof(struct rte_tcp_hdr);
+	if ((tcp_hl != tcp_hl_orig) || ((len > 0) &&
+				(memcmp(tcph + 1, tcph_orig + 1,
+					len) != 0)))
+		return 0;
+
+	/* Don't merge packets whose DF bits are different */
+	if (unlikely(item->is_atomic ^ is_atomic))
+		return 0;
+
+	/* check if the two packets are neighbors */
+	len = pkt_orig->pkt_len - l2_offset - pkt_orig->l2_len -
+		pkt_orig->l3_len - tcp_hl_orig;
+	if ((sent_seq == item->sent_seq + len) && (is_atomic ||
+				(ip_id == item->ip_id + 1)))
+		/* append the new packet */
+		return 1;
+	else if ((sent_seq + tcp_dl == item->sent_seq) && (is_atomic ||
+				(ip_id + item->nb_merged == item->ip_id)))
+		/* pre-pend the new packet */
+		return -1;
+
+	return 0;
+}
+
+#endif
diff --git a/lib/gro/gro_tcp4.c b/lib/gro/gro_tcp4.c
index 8f5e800250..eea2a72ecd 100644
--- a/lib/gro/gro_tcp4.c
+++ b/lib/gro/gro_tcp4.c
@@ -7,6 +7,7 @@
 #include <rte_ethdev.h>
 
 #include "gro_tcp4.h"
+#include "gro_tcp.h"
 
 void *
 gro_tcp4_tbl_create(uint16_t socket_id,
@@ -30,7 +31,7 @@ gro_tcp4_tbl_create(uint16_t socket_id,
 	if (tbl == NULL)
 		return NULL;
 
-	size = sizeof(struct gro_tcp4_item) * entries_num;
+	size = sizeof(struct gro_tcp_item) * entries_num;
 	tbl->items = rte_zmalloc_socket(__func__,
 			size,
 			RTE_CACHE_LINE_SIZE,
@@ -177,7 +178,7 @@ insert_new_flow(struct gro_tcp4_tbl *tbl,
  * update the packet length for the flushed packet.
  */
 static inline void
-update_header(struct gro_tcp4_item *item)
+update_header(struct gro_tcp_item *item)
 {
 	struct rte_ipv4_hdr *ipv4_hdr;
 	struct rte_mbuf *pkt = item->firstseg;
@@ -302,7 +303,7 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt,
 				sent_seq, ip_id, pkt->l4_len, tcp_dl, 0,
 				is_atomic);
 		if (cmp) {
-			if (merge_two_tcp4_packets(&(tbl->items[cur_idx]),
+			if (merge_two_tcp_packets(&(tbl->items[cur_idx]),
 						pkt, cmp, sent_seq, ip_id, 0))
 				return 1;
 			/*
diff --git a/lib/gro/gro_tcp4.h b/lib/gro/gro_tcp4.h
index 212f97a042..634a215b98 100644
--- a/lib/gro/gro_tcp4.h
+++ b/lib/gro/gro_tcp4.h
@@ -5,22 +5,9 @@
 #ifndef _GRO_TCP4_H_
 #define _GRO_TCP4_H_
 
-#include <rte_tcp.h>
-
 #define INVALID_ARRAY_INDEX 0xffffffffUL
 #define GRO_TCP4_TBL_MAX_ITEM_NUM (1024UL * 1024UL)
 
-/*
- * The max length of a IPv4 packet, which includes the length of the L3
- * header, the L4 header and the data payload.
- */
-#define MAX_IPV4_PKT_LENGTH UINT16_MAX
-
-/* The maximum TCP header length */
-#define MAX_TCP_HLEN 60
-#define INVALID_TCP_HDRLEN(len) \
-	(((len) < sizeof(struct rte_tcp_hdr)) || ((len) > MAX_TCP_HLEN))
-
 /* Header fields representing a TCP/IPv4 flow */
 struct tcp4_flow_key {
 	struct rte_ether_addr eth_saddr;
@@ -42,42 +29,12 @@ struct gro_tcp4_flow {
 	uint32_t start_index;
 };
 
-struct gro_tcp4_item {
-	/*
-	 * The first MBUF segment of the packet. If the value
-	 * is NULL, it means the item is empty.
-	 */
-	struct rte_mbuf *firstseg;
-	/* The last MBUF segment of the packet */
-	struct rte_mbuf *lastseg;
-	/*
-	 * The time when the first packet is inserted into the table.
-	 * This value won't be updated, even if the packet is merged
-	 * with other packets.
-	 */
-	uint64_t start_time;
-	/*
-	 * next_pkt_idx is used to chain the packets that
-	 * are in the same flow but can't be merged together
-	 * (e.g. caused by packet reordering).
-	 */
-	uint32_t next_pkt_idx;
-	/* TCP sequence number of the packet */
-	uint32_t sent_seq;
-	/* IPv4 ID of the packet */
-	uint16_t ip_id;
-	/* the number of merged packets */
-	uint16_t nb_merged;
-	/* Indicate if IPv4 ID can be ignored */
-	uint8_t is_atomic;
-};
-
 /*
  * TCP/IPv4 reassembly table structure.
  */
 struct gro_tcp4_tbl {
 	/* item array */
-	struct gro_tcp4_item *items;
+	struct gro_tcp_item *items;
 	/* flow array */
 	struct gro_tcp4_flow *flows;
 	/* current item number */
@@ -195,111 +152,4 @@ is_same_tcp4_flow(struct tcp4_flow_key k1, struct tcp4_flow_key k2)
 			(k1.dst_port == k2.dst_port));
 }
 
-/*
- * Merge two TCP/IPv4 packets without updating checksums.
- * If cmp is larger than 0, append the new packet to the
- * original packet. Otherwise, pre-pend the new packet to
- * the original packet.
- */
-static inline int
-merge_two_tcp4_packets(struct gro_tcp4_item *item,
-		struct rte_mbuf *pkt,
-		int cmp,
-		uint32_t sent_seq,
-		uint16_t ip_id,
-		uint16_t l2_offset)
-{
-	struct rte_mbuf *pkt_head, *pkt_tail, *lastseg;
-	uint16_t hdr_len, l2_len;
-
-	if (cmp > 0) {
-		pkt_head = item->firstseg;
-		pkt_tail = pkt;
-	} else {
-		pkt_head = pkt;
-		pkt_tail = item->firstseg;
-	}
-
-	/* check if the IPv4 packet length is greater than the max value */
-	hdr_len = l2_offset + pkt_head->l2_len + pkt_head->l3_len +
-		pkt_head->l4_len;
-	l2_len = l2_offset > 0 ? pkt_head->outer_l2_len : pkt_head->l2_len;
-	if (unlikely(pkt_head->pkt_len - l2_len + pkt_tail->pkt_len -
-				hdr_len > MAX_IPV4_PKT_LENGTH))
-		return 0;
-
-	/* remove the packet header for the tail packet */
-	rte_pktmbuf_adj(pkt_tail, hdr_len);
-
-	/* chain two packets together */
-	if (cmp > 0) {
-		item->lastseg->next = pkt;
-		item->lastseg = rte_pktmbuf_lastseg(pkt);
-		/* update IP ID to the larger value */
-		item->ip_id = ip_id;
-	} else {
-		lastseg = rte_pktmbuf_lastseg(pkt);
-		lastseg->next = item->firstseg;
-		item->firstseg = pkt;
-		/* update sent_seq to the smaller value */
-		item->sent_seq = sent_seq;
-		item->ip_id = ip_id;
-	}
-	item->nb_merged++;
-
-	/* update MBUF metadata for the merged packet */
-	pkt_head->nb_segs += pkt_tail->nb_segs;
-	pkt_head->pkt_len += pkt_tail->pkt_len;
-
-	return 1;
-}
-
-/*
- * Check if two TCP/IPv4 packets are neighbors.
- */
-static inline int
-check_seq_option(struct gro_tcp4_item *item,
-		struct rte_tcp_hdr *tcph,
-		uint32_t sent_seq,
-		uint16_t ip_id,
-		uint16_t tcp_hl,
-		uint16_t tcp_dl,
-		uint16_t l2_offset,
-		uint8_t is_atomic)
-{
-	struct rte_mbuf *pkt_orig = item->firstseg;
-	struct rte_ipv4_hdr *iph_orig;
-	struct rte_tcp_hdr *tcph_orig;
-	uint16_t len, tcp_hl_orig;
-
-	iph_orig = (struct rte_ipv4_hdr *)(rte_pktmbuf_mtod(pkt_orig, char *) +
-			l2_offset + pkt_orig->l2_len);
-	tcph_orig = (struct rte_tcp_hdr *)((char *)iph_orig + pkt_orig->l3_len);
-	tcp_hl_orig = pkt_orig->l4_len;
-
-	/* Check if TCP option fields equal */
-	len = RTE_MAX(tcp_hl, tcp_hl_orig) - sizeof(struct rte_tcp_hdr);
-	if ((tcp_hl != tcp_hl_orig) || ((len > 0) &&
-				(memcmp(tcph + 1, tcph_orig + 1,
-					len) != 0)))
-		return 0;
-
-	/* Don't merge packets whose DF bits are different */
-	if (unlikely(item->is_atomic ^ is_atomic))
-		return 0;
-
-	/* check if the two packets are neighbors */
-	len = pkt_orig->pkt_len - l2_offset - pkt_orig->l2_len -
-		pkt_orig->l3_len - tcp_hl_orig;
-	if ((sent_seq == item->sent_seq + len) && (is_atomic ||
-				(ip_id == item->ip_id + 1)))
-		/* append the new packet */
-		return 1;
-	else if ((sent_seq + tcp_dl == item->sent_seq) && (is_atomic ||
-				(ip_id + item->nb_merged == item->ip_id)))
-		/* pre-pend the new packet */
-		return -1;
-
-	return 0;
-}
 #endif
diff --git a/lib/gro/gro_tcp6.c b/lib/gro/gro_tcp6.c
new file mode 100644
index 0000000000..7a739f2472
--- /dev/null
+++ b/lib/gro/gro_tcp6.c
@@ -0,0 +1,388 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2017 Intel Corporation
+ */
+
+#include <rte_malloc.h>
+#include <rte_mbuf.h>
+#include <rte_ethdev.h>
+
+#include "gro_tcp6.h"
+#include "gro_tcp.h"
+
+void *
+gro_tcp6_tbl_create(uint16_t socket_id,
+		uint16_t max_flow_num,
+		uint16_t max_item_per_flow)
+{
+	struct gro_tcp6_tbl *tbl;
+	size_t size;
+	uint32_t entries_num, i;
+
+	entries_num = max_flow_num * max_item_per_flow;
+	entries_num = RTE_MIN(entries_num, GRO_TCP6_TBL_MAX_ITEM_NUM);
+
+	if (entries_num == 0)
+		return NULL;
+
+	tbl = rte_zmalloc_socket(__func__,
+			sizeof(struct gro_tcp6_tbl),
+			RTE_CACHE_LINE_SIZE,
+			socket_id);
+	if (tbl == NULL)
+		return NULL;
+
+	size = sizeof(struct gro_tcp_item) * entries_num;
+	tbl->items = rte_zmalloc_socket(__func__,
+			size,
+			RTE_CACHE_LINE_SIZE,
+			socket_id);
+	if (tbl->items == NULL) {
+		rte_free(tbl);
+		return NULL;
+	}
+	tbl->max_item_num = entries_num;
+
+	size = sizeof(struct gro_tcp6_flow) * entries_num;
+	tbl->flows = rte_zmalloc_socket(__func__,
+			size,
+			RTE_CACHE_LINE_SIZE,
+			socket_id);
+	if (tbl->flows == NULL) {
+		rte_free(tbl->items);
+		rte_free(tbl);
+		return NULL;
+	}
+	/* INVALID_ARRAY_INDEX indicates an empty flow */
+	for (i = 0; i < entries_num; i++)
+		tbl->flows[i].start_index = INVALID_ARRAY_INDEX;
+	tbl->max_flow_num = entries_num;
+
+	return tbl;
+}
+
+void
+gro_tcp6_tbl_destroy(void *tbl)
+{
+	struct gro_tcp6_tbl *tcp_tbl = tbl;
+
+	if (tcp_tbl) {
+		rte_free(tcp_tbl->items);
+		rte_free(tcp_tbl->flows);
+	}
+	rte_free(tcp_tbl);
+}
+
+static inline uint32_t
+find_an_empty_item(struct gro_tcp6_tbl *tbl)
+{
+	uint32_t i;
+	uint32_t max_item_num = tbl->max_item_num;
+
+	for (i = 0; i < max_item_num; i++)
+		if (tbl->items[i].firstseg == NULL)
+			return i;
+	return INVALID_ARRAY_INDEX;
+}
+
+static inline uint32_t
+find_an_empty_flow(struct gro_tcp6_tbl *tbl)
+{
+	uint32_t i;
+	uint32_t max_flow_num = tbl->max_flow_num;
+
+	for (i = 0; i < max_flow_num; i++)
+		if (tbl->flows[i].start_index == INVALID_ARRAY_INDEX)
+			return i;
+	return INVALID_ARRAY_INDEX;
+}
+
+static inline uint32_t
+insert_new_item(struct gro_tcp6_tbl *tbl,
+		struct rte_mbuf *pkt,
+		uint64_t start_time,
+		uint32_t prev_idx,
+		uint32_t sent_seq,
+		uint8_t is_atomic)
+{
+	uint32_t item_idx;
+
+	item_idx = find_an_empty_item(tbl);
+	if (item_idx == INVALID_ARRAY_INDEX)
+		return INVALID_ARRAY_INDEX;
+
+	tbl->items[item_idx].firstseg = pkt;
+	tbl->items[item_idx].lastseg = rte_pktmbuf_lastseg(pkt);
+	tbl->items[item_idx].start_time = start_time;
+	tbl->items[item_idx].next_pkt_idx = INVALID_ARRAY_INDEX;
+	tbl->items[item_idx].sent_seq = sent_seq;
+	tbl->items[item_idx].nb_merged = 1;
+	tbl->items[item_idx].is_atomic = is_atomic;
+	tbl->item_num++;
+
+	/* if the previous packet exists, chain them together. */
+	if (prev_idx != INVALID_ARRAY_INDEX) {
+		tbl->items[item_idx].next_pkt_idx =
+			tbl->items[prev_idx].next_pkt_idx;
+		tbl->items[prev_idx].next_pkt_idx = item_idx;
+	}
+
+	return item_idx;
+}
+
+static inline uint32_t
+delete_item(struct gro_tcp6_tbl *tbl, uint32_t item_idx,
+		uint32_t prev_item_idx)
+{
+	uint32_t next_idx = tbl->items[item_idx].next_pkt_idx;
+
+	/* NULL indicates an empty item */
+	tbl->items[item_idx].firstseg = NULL;
+	tbl->item_num--;
+	if (prev_item_idx != INVALID_ARRAY_INDEX)
+		tbl->items[prev_item_idx].next_pkt_idx = next_idx;
+
+	return next_idx;
+}
+
+static inline uint32_t
+insert_new_flow(struct gro_tcp6_tbl *tbl,
+		struct tcp6_flow_key *src,
+		rte_be32_t vtc_flow,
+		uint32_t item_idx)
+{
+	struct tcp6_flow_key *dst;
+	uint32_t flow_idx;
+
+	flow_idx = find_an_empty_flow(tbl);
+	if (unlikely(flow_idx == INVALID_ARRAY_INDEX))
+		return INVALID_ARRAY_INDEX;
+
+	dst = &(tbl->flows[flow_idx].key);
+
+	rte_ether_addr_copy(&(src->eth_saddr), &(dst->eth_saddr));
+	rte_ether_addr_copy(&(src->eth_daddr), &(dst->eth_daddr));
+	memcpy(&dst->src_addr[0], &src->src_addr[0], sizeof(dst->src_addr));
+	memcpy(&dst->dst_addr[0], &src->dst_addr[0], sizeof(dst->dst_addr));
+	dst->recv_ack = src->recv_ack;
+	dst->src_port = src->src_port;
+	dst->dst_port = src->dst_port;
+
+	tbl->flows[flow_idx].start_index = item_idx;
+	tbl->flow_num++;
+	tbl->flows->vtc_flow = vtc_flow;
+
+	return flow_idx;
+}
+
+/*
+ * update the packet length for the flushed packet.
+ */
+static inline void
+update_header(struct gro_tcp_item *item)
+{
+	struct rte_ipv6_hdr *ipv6_hdr;
+	struct rte_mbuf *pkt = item->firstseg;
+
+	ipv6_hdr = (struct rte_ipv6_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
+			pkt->l2_len);
+	ipv6_hdr->payload_len = rte_cpu_to_be_16(pkt->pkt_len -
+			pkt->l2_len - pkt->l3_len);
+}
+
+int32_t
+gro_tcp6_reassemble(struct rte_mbuf *pkt,
+		struct gro_tcp6_tbl *tbl,
+		uint64_t start_time)
+{
+	struct rte_ether_hdr *eth_hdr;
+	struct rte_ipv6_hdr *ipv6_hdr;
+	struct rte_tcp_hdr *tcp_hdr;
+	uint32_t sent_seq;
+	int32_t tcp_dl;
+	uint16_t ip_tlen;
+	struct tcp6_flow_key key;
+	uint32_t cur_idx, prev_idx, item_idx;
+	uint32_t i, max_flow_num, remaining_flow_num;
+	int cmp;
+	uint8_t find;
+	rte_be32_t vtc_flow_diff;
+
+	/*
+	 * Don't process the packet whose TCP header length is greater
+	 * than 60 bytes or less than 20 bytes.
+	 */
+	if (unlikely(INVALID_TCP_HDRLEN(pkt->l4_len)))
+		return -1;
+
+	eth_hdr = rte_pktmbuf_mtod(pkt, struct rte_ether_hdr *);
+	ipv6_hdr = (struct rte_ipv6_hdr *)((char *)eth_hdr + pkt->l2_len);
+	tcp_hdr = (struct rte_tcp_hdr *)((char *)ipv6_hdr + pkt->l3_len);
+
+	/*
+	 * Don't process the packet which has FIN, SYN, RST, PSH, URG, ECE
+	 * or CWR set.
+	 */
+	if (tcp_hdr->tcp_flags != RTE_TCP_ACK_FLAG)
+		return -1;
+
+	ip_tlen = rte_be_to_cpu_16(ipv6_hdr->payload_len);
+	/* 
+	 * Trim the tail padding bytes. The IPv6 header is fixed to 
+	 * 40 bytes unlike IPv4 that is variable. The length in the IPv6 header 
+	 * contains only length of TCP Header + TCP Payload, whereas IPv4 header contains 
+	 * length of IP Header + TCP Header + TCP Payload
+	 */
+	if (pkt->pkt_len > (uint32_t)(ip_tlen + pkt->l2_len + pkt->l3_len))
+		rte_pktmbuf_trim(pkt, pkt->pkt_len - ip_tlen - pkt->l2_len - pkt->l3_len);
+	/*
+	 * Don't process the packet whose payload length is less than or
+	 * equal to 0.
+	 */
+	tcp_dl = ip_tlen - pkt->l4_len;
+	if (tcp_dl <= 0)
+		return -1;
+
+	sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
+
+	rte_ether_addr_copy(&(eth_hdr->src_addr), &(key.eth_saddr));
+	rte_ether_addr_copy(&(eth_hdr->dst_addr), &(key.eth_daddr));
+    memcpy(&key.src_addr[0], &ipv6_hdr->src_addr, sizeof(key.src_addr));
+    memcpy(&key.dst_addr[0], &ipv6_hdr->dst_addr, sizeof(key.dst_addr));
+	key.src_port = tcp_hdr->src_port;
+	key.dst_port = tcp_hdr->dst_port;
+	key.recv_ack = tcp_hdr->recv_ack;
+
+	/* Search for a matched flow. */
+	max_flow_num = tbl->max_flow_num;
+	remaining_flow_num = tbl->flow_num;
+	find = 0;
+	for (i = 0; i < max_flow_num && remaining_flow_num; i++) {
+		if (tbl->flows[i].start_index != INVALID_ARRAY_INDEX) {
+			if (is_same_tcp6_flow(tbl->flows[i].key, key)) {
+				/* 
+				 * IP version (4) Traffic Class (8) Flow Label (20) 
+				 * All fields except Traffic class should be same
+				*/
+				vtc_flow_diff = (ipv6_hdr->vtc_flow ^ tbl->flows->vtc_flow);
+				if (vtc_flow_diff & htonl(0xF00FFFFF)) {
+					continue;
+				}
+				find = 1;
+				break;
+			}
+			remaining_flow_num--;
+		}
+	}
+
+	/*
+	 * Fail to find a matched flow. Insert a new flow and store the
+	 * packet into the flow.
+	 */
+	if (find == 0) {
+		item_idx = insert_new_item(tbl, pkt, start_time,
+				INVALID_ARRAY_INDEX, sent_seq, true);
+		if (item_idx == INVALID_ARRAY_INDEX)
+			return -1;
+		if (insert_new_flow(tbl, &key, ipv6_hdr->vtc_flow, item_idx) ==
+				INVALID_ARRAY_INDEX) {
+			/*
+			 * Fail to insert a new flow, so delete the
+			 * stored packet.
+			 */
+			delete_item(tbl, item_idx, INVALID_ARRAY_INDEX);
+			return -1;
+		}
+		return 0;
+	}
+
+	/*
+	 * Check all packets in the flow and try to find a neighbor for
+	 * the input packet.
+	 */
+	cur_idx = tbl->flows[i].start_index;
+	prev_idx = cur_idx;
+	do {
+		cmp = check_seq_option(&(tbl->items[cur_idx]), tcp_hdr,
+				sent_seq, 0, pkt->l4_len, tcp_dl, 0,
+				true);
+		if (cmp) {
+			if (merge_two_tcp_packets(&(tbl->items[cur_idx]),
+						pkt, cmp, sent_seq, 0, 0)) {
+				return 1;
+            }
+
+			/*
+			 * Fail to merge the two packets, as the packet
+			 * length is greater than the max value. Store
+			 * the packet into the flow.
+			 */
+			if (insert_new_item(tbl, pkt, start_time, cur_idx,
+						sent_seq, true) ==
+					INVALID_ARRAY_INDEX)
+				return -1;
+			return 0;
+		}
+		prev_idx = cur_idx;
+		cur_idx = tbl->items[cur_idx].next_pkt_idx;
+	} while (cur_idx != INVALID_ARRAY_INDEX);
+
+	/* Fail to find a neighbor, so store the packet into the flow. */
+	if (insert_new_item(tbl, pkt, start_time, prev_idx, sent_seq,
+				true) == INVALID_ARRAY_INDEX)
+		return -1;
+
+	return 0;
+}
+
+uint16_t
+gro_tcp6_tbl_timeout_flush(struct gro_tcp6_tbl *tbl,
+		uint64_t flush_timestamp,
+		struct rte_mbuf **out,
+		uint16_t nb_out)
+{
+	uint16_t k = 0;
+	uint32_t i, j;
+	uint32_t max_flow_num = tbl->max_flow_num;
+
+	for (i = 0; i < max_flow_num; i++) {
+		if (unlikely(tbl->flow_num == 0))
+			return k;
+
+		j = tbl->flows[i].start_index;
+		while (j != INVALID_ARRAY_INDEX) {
+			if (tbl->items[j].start_time <= flush_timestamp) {
+				out[k++] = tbl->items[j].firstseg;
+				if (tbl->items[j].nb_merged > 1)
+					update_header(&(tbl->items[j]));
+				/*
+				 * Delete the packet and get the next
+				 * packet in the flow.
+				 */
+				j = delete_item(tbl, j, INVALID_ARRAY_INDEX);
+				tbl->flows[i].start_index = j;
+				if (j == INVALID_ARRAY_INDEX)
+					tbl->flow_num--;
+
+				if (unlikely(k == nb_out))
+					return k;
+			} else
+				/*
+				 * The left packets in this flow won't be
+				 * timeout. Go to check other flows.
+				 */
+				break;
+		}
+	}
+	return k;
+}
+
+uint32_t
+gro_tcp6_tbl_pkt_count(void *tbl)
+{
+	struct gro_tcp6_tbl *gro_tbl = tbl;
+
+	if (gro_tbl)
+		return gro_tbl->item_num;
+
+	return 0;
+}
diff --git a/lib/gro/gro_tcp6.h b/lib/gro/gro_tcp6.h
new file mode 100644
index 0000000000..aea231adbb
--- /dev/null
+++ b/lib/gro/gro_tcp6.h
@@ -0,0 +1,150 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2017 Intel Corporation
+ */
+
+#ifndef _GRO_TCP6_H_
+#define _GRO_TCP6_H_
+
+#define INVALID_ARRAY_INDEX 0xffffffffUL
+#define GRO_TCP6_TBL_MAX_ITEM_NUM (1024UL * 1024UL)
+
+/* Header fields representing a TCP/IPv6 flow */
+struct tcp6_flow_key {
+	struct rte_ether_addr eth_saddr;
+	struct rte_ether_addr eth_daddr;
+    uint8_t  src_addr[16];
+    uint8_t  dst_addr[16];
+
+	uint32_t recv_ack;
+	uint16_t src_port;
+	uint16_t dst_port;
+};
+
+struct gro_tcp6_flow {
+	struct tcp6_flow_key key;
+	rte_be32_t vtc_flow;
+	/*
+	 * The index of the first packet in the flow.
+	 * INVALID_ARRAY_INDEX indicates an empty flow.
+	 */
+	uint32_t start_index;
+};
+
+/*
+ * TCP/IPv6 reassembly table structure.
+ */
+struct gro_tcp6_tbl {
+	/* item array */
+	struct gro_tcp_item *items;
+	/* flow array */
+	struct gro_tcp6_flow *flows;
+	/* current item number */
+	uint32_t item_num;
+	/* current flow num */
+	uint32_t flow_num;
+	/* item array size */
+	uint32_t max_item_num;
+	/* flow array size */
+	uint32_t max_flow_num;
+};
+
+/**
+ * This function creates a TCP/IPv6 reassembly table.
+ *
+ * @param socket_id
+ *  Socket index for allocating the TCP/IPv6 reassemble table
+ * @param max_flow_num
+ *  The maximum number of flows in the TCP/IPv6 GRO table
+ * @param max_item_per_flow
+ *  The maximum number of packets per flow
+ *
+ * @return
+ *  - Return the table pointer on success.
+ *  - Return NULL on failure.
+ */
+void *gro_tcp6_tbl_create(uint16_t socket_id,
+		uint16_t max_flow_num,
+		uint16_t max_item_per_flow);
+
+/**
+ * This function destroys a TCP/IPv6 reassembly table.
+ *
+ * @param tbl
+ *  Pointer pointing to the TCP/IPv6 reassembly table.
+ */
+void gro_tcp6_tbl_destroy(void *tbl);
+
+/**
+ * This function merges a TCP/IPv6 packet. It doesn't process the packet,
+ * which has SYN, FIN, RST, PSH, CWR, ECE or URG set, or doesn't have
+ * payload.
+ *
+ * This function doesn't check if the packet has correct checksums and
+ * doesn't re-calculate checksums for the merged packet. Additionally,
+ * it assumes the packets are complete (i.e., MF==0 && frag_off==0),
+ * when IP fragmentation is possible (i.e., DF==0). It returns the
+ * packet, if the packet has invalid parameters (e.g. SYN bit is set)
+ * or there is no available space in the table.
+ *
+ * @param pkt
+ *  Packet to reassemble
+ * @param tbl
+ *  Pointer pointing to the TCP/IPv6 reassembly table
+ * @start_time
+ *  The time when the packet is inserted into the table
+ *
+ * @return
+ *  - Return a positive value if the packet is merged.
+ *  - Return zero if the packet isn't merged but stored in the table.
+ *  - Return a negative value for invalid parameters or no available
+ *    space in the table.
+ */
+int32_t gro_tcp6_reassemble(struct rte_mbuf *pkt,
+		struct gro_tcp6_tbl *tbl,
+		uint64_t start_time);
+
+/**
+ * This function flushes timeout packets in a TCP/IPv4 reassembly table,
+ * and without updating checksums.
+ *
+ * @param tbl
+ *  TCP/IPv4 reassembly table pointer
+ * @param flush_timestamp
+ *  Flush packets which are inserted into the table before or at the
+ *  flush_timestamp.
+ * @param out
+ *  Pointer array used to keep flushed packets
+ * @param nb_out
+ *  The element number in 'out'. It also determines the maximum number of
+ *  packets that can be flushed finally.
+ *
+ * @return
+ *  The number of flushed packets
+ */
+uint16_t gro_tcp6_tbl_timeout_flush(struct gro_tcp6_tbl *tbl,
+		uint64_t flush_timestamp,
+		struct rte_mbuf **out,
+		uint16_t nb_out);
+
+/**
+ * This function returns the number of the packets in a TCP/IPv4
+ * reassembly table.
+ *
+ * @param tbl
+ *  TCP/IPv4 reassembly table pointer
+ *
+ * @return
+ *  The number of packets in the table
+ */
+uint32_t gro_tcp6_tbl_pkt_count(void *tbl);
+
+/*
+ * Check if two TCP/IPv4 packets belong to the same flow.
+ */
+static inline int
+is_same_tcp6_flow(struct tcp6_flow_key k1, struct tcp6_flow_key k2)
+{
+    return (!memcmp(&k1, &k2, sizeof(struct tcp6_flow_key)));
+}
+
+#endif
\ No newline at end of file
diff --git a/lib/gro/gro_vxlan_tcp4.c b/lib/gro/gro_vxlan_tcp4.c
index 3be4deb7c7..56b30b8c98 100644
--- a/lib/gro/gro_vxlan_tcp4.c
+++ b/lib/gro/gro_vxlan_tcp4.c
@@ -7,6 +7,7 @@
 #include <rte_ethdev.h>
 #include <rte_udp.h>
 
+#include "gro_tcp.h"
 #include "gro_vxlan_tcp4.h"
 
 void *
@@ -248,7 +249,7 @@ merge_two_vxlan_tcp4_packets(struct gro_vxlan_tcp4_item *item,
 		uint16_t outer_ip_id,
 		uint16_t ip_id)
 {
-	if (merge_two_tcp4_packets(&item->inner_item, pkt, cmp, sent_seq,
+	if (merge_two_tcp_packets(&item->inner_item, pkt, cmp, sent_seq,
 				ip_id, pkt->outer_l2_len +
 				pkt->outer_l3_len)) {
 		/* Update the outer IPv4 ID to the large value. */
diff --git a/lib/gro/gro_vxlan_tcp4.h b/lib/gro/gro_vxlan_tcp4.h
index 7832942a68..d68d5fcd5b 100644
--- a/lib/gro/gro_vxlan_tcp4.h
+++ b/lib/gro/gro_vxlan_tcp4.h
@@ -5,6 +5,7 @@
 #ifndef _GRO_VXLAN_TCP4_H_
 #define _GRO_VXLAN_TCP4_H_
 
+#include "gro_tcp.h"
 #include "gro_tcp4.h"
 
 #define GRO_VXLAN_TCP4_TBL_MAX_ITEM_NUM (1024UL * 1024UL)
@@ -36,7 +37,7 @@ struct gro_vxlan_tcp4_flow {
 };
 
 struct gro_vxlan_tcp4_item {
-	struct gro_tcp4_item inner_item;
+	struct gro_tcp_item inner_item;
 	/* IPv4 ID in the outer IPv4 header */
 	uint16_t outer_ip_id;
 	/* Indicate if outer IPv4 ID can be ignored */
diff --git a/lib/gro/meson.build b/lib/gro/meson.build
index e4fa2958bd..dbce05220d 100644
--- a/lib/gro/meson.build
+++ b/lib/gro/meson.build
@@ -4,6 +4,7 @@
 sources = files(
         'rte_gro.c',
         'gro_tcp4.c',
+        'gro_tcp6.c',
         'gro_udp4.c',
         'gro_vxlan_tcp4.c',
         'gro_vxlan_udp4.c',
diff --git a/lib/gro/rte_gro.c b/lib/gro/rte_gro.c
index e35399fd42..c8180d24e3 100644
--- a/lib/gro/rte_gro.c
+++ b/lib/gro/rte_gro.c
@@ -8,6 +8,7 @@
 
 #include "rte_gro.h"
 #include "gro_tcp4.h"
+#include "gro_tcp6.h"
 #include "gro_udp4.h"
 #include "gro_vxlan_tcp4.h"
 #include "gro_vxlan_udp4.h"
@@ -20,14 +21,16 @@ typedef uint32_t (*gro_tbl_pkt_count_fn)(void *tbl);
 
 static gro_tbl_create_fn tbl_create_fn[RTE_GRO_TYPE_MAX_NUM] = {
 		gro_tcp4_tbl_create, gro_vxlan_tcp4_tbl_create,
-		gro_udp4_tbl_create, gro_vxlan_udp4_tbl_create, NULL};
+		gro_udp4_tbl_create, gro_vxlan_udp4_tbl_create, gro_tcp6_tbl_create, NULL};
 static gro_tbl_destroy_fn tbl_destroy_fn[RTE_GRO_TYPE_MAX_NUM] = {
 			gro_tcp4_tbl_destroy, gro_vxlan_tcp4_tbl_destroy,
 			gro_udp4_tbl_destroy, gro_vxlan_udp4_tbl_destroy,
+			gro_tcp6_tbl_destroy,
 			NULL};
 static gro_tbl_pkt_count_fn tbl_pkt_count_fn[RTE_GRO_TYPE_MAX_NUM] = {
 			gro_tcp4_tbl_pkt_count, gro_vxlan_tcp4_tbl_pkt_count,
 			gro_udp4_tbl_pkt_count, gro_vxlan_udp4_tbl_pkt_count,
+			gro_tcp6_tbl_pkt_count,
 			NULL};
 
 #define IS_IPV4_TCP_PKT(ptype) (RTE_ETH_IS_IPV4_HDR(ptype) && \
@@ -35,6 +38,12 @@ static gro_tbl_pkt_count_fn tbl_pkt_count_fn[RTE_GRO_TYPE_MAX_NUM] = {
 		((ptype & RTE_PTYPE_L4_FRAG) != RTE_PTYPE_L4_FRAG) && \
 		(RTE_ETH_IS_TUNNEL_PKT(ptype) == 0))
 
+/* GRO with extension headers is not supported */
+#define IS_IPV6_TCP_PKT(ptype) (RTE_ETH_IS_IPV6_HDR(ptype) && \
+		((ptype & RTE_PTYPE_L4_TCP) == RTE_PTYPE_L4_TCP) && \
+		((ptype & RTE_PTYPE_L4_FRAG) != RTE_PTYPE_L4_FRAG) && \
+		(RTE_ETH_IS_TUNNEL_PKT(ptype) == 0))
+
 #define IS_IPV4_UDP_PKT(ptype) (RTE_ETH_IS_IPV4_HDR(ptype) && \
 		((ptype & RTE_PTYPE_L4_UDP) == RTE_PTYPE_L4_UDP) && \
 		(RTE_ETH_IS_TUNNEL_PKT(ptype) == 0))
@@ -147,7 +156,11 @@ rte_gro_reassemble_burst(struct rte_mbuf **pkts,
 	/* allocate a reassembly table for TCP/IPv4 GRO */
 	struct gro_tcp4_tbl tcp_tbl;
 	struct gro_tcp4_flow tcp_flows[RTE_GRO_MAX_BURST_ITEM_NUM];
-	struct gro_tcp4_item tcp_items[RTE_GRO_MAX_BURST_ITEM_NUM] = {{0} };
+	struct gro_tcp_item tcp_items[RTE_GRO_MAX_BURST_ITEM_NUM] = {{0} };
+
+	struct gro_tcp6_tbl tcp6_tbl;
+	struct gro_tcp6_flow tcp6_flows[RTE_GRO_MAX_BURST_ITEM_NUM];
+	struct gro_tcp_item tcp6_items[RTE_GRO_MAX_BURST_ITEM_NUM] = {{0} };
 
 	/* allocate a reassembly table for UDP/IPv4 GRO */
 	struct gro_udp4_tbl udp_tbl;
@@ -171,10 +184,10 @@ rte_gro_reassemble_burst(struct rte_mbuf **pkts,
 	int32_t ret;
 	uint16_t i, unprocess_num = 0, nb_after_gro = nb_pkts;
 	uint8_t do_tcp4_gro = 0, do_vxlan_tcp_gro = 0, do_udp4_gro = 0,
-		do_vxlan_udp_gro = 0;
+		do_vxlan_udp_gro = 0, do_tcp6_gro = 0;
 
 	if (unlikely((param->gro_types & (RTE_GRO_IPV4_VXLAN_TCP_IPV4 |
-					RTE_GRO_TCP_IPV4 |
+					RTE_GRO_TCP_IPV4 | RTE_GRO_TCP_IPV6 |
 					RTE_GRO_IPV4_VXLAN_UDP_IPV4 |
 					RTE_GRO_UDP_IPV4)) == 0))
 		return nb_pkts;
@@ -236,6 +249,18 @@ rte_gro_reassemble_burst(struct rte_mbuf **pkts,
 		do_udp4_gro = 1;
 	}
 
+	if (param->gro_types & RTE_GRO_TCP_IPV6) {
+		for (i = 0; i < item_num; i++)
+			tcp6_flows[i].start_index = INVALID_ARRAY_INDEX;
+
+		tcp6_tbl.flows = tcp6_flows;
+		tcp6_tbl.items = tcp6_items;
+		tcp6_tbl.flow_num = 0;
+		tcp6_tbl.item_num = 0;
+		tcp6_tbl.max_flow_num = item_num;
+		tcp6_tbl.max_item_num = item_num;
+		do_tcp6_gro = 1;
+	}
 
 	for (i = 0; i < nb_pkts; i++) {
 		/*
@@ -276,6 +301,14 @@ rte_gro_reassemble_burst(struct rte_mbuf **pkts,
 				nb_after_gro--;
 			else if (ret < 0)
 				unprocess_pkts[unprocess_num++] = pkts[i];
+		} else if (IS_IPV6_TCP_PKT(pkts[i]->packet_type) && 
+				do_tcp6_gro) {
+			ret = gro_tcp6_reassemble(pkts[i], &tcp6_tbl, 0);
+			if (ret > 0)
+				/* merge successfully */
+				nb_after_gro--;
+			else if (ret < 0)
+				unprocess_pkts[unprocess_num++] = pkts[i];
 		} else
 			unprocess_pkts[unprocess_num++] = pkts[i];
 	}
@@ -283,9 +316,17 @@ rte_gro_reassemble_burst(struct rte_mbuf **pkts,
 	if ((nb_after_gro < nb_pkts)
 		 || (unprocess_num < nb_pkts)) {
 		i = 0;
+		/* Copy unprocessed packets */
+		if (unprocess_num > 0) {
+			memcpy(&pkts[i], unprocess_pkts,
+					sizeof(struct rte_mbuf *) *
+					unprocess_num);
+			i = unprocess_num;
+		}
+
 		/* Flush all packets from the tables */
 		if (do_vxlan_tcp_gro) {
-			i = gro_vxlan_tcp4_tbl_timeout_flush(&vxlan_tcp_tbl,
+			i += gro_vxlan_tcp4_tbl_timeout_flush(&vxlan_tcp_tbl,
 					0, pkts, nb_pkts);
 		}
 
@@ -304,13 +345,11 @@ rte_gro_reassemble_burst(struct rte_mbuf **pkts,
 			i += gro_udp4_tbl_timeout_flush(&udp_tbl, 0,
 					&pkts[i], nb_pkts - i);
 		}
-		/* Copy unprocessed packets */
-		if (unprocess_num > 0) {
-			memcpy(&pkts[i], unprocess_pkts,
-					sizeof(struct rte_mbuf *) *
-					unprocess_num);
+
+		if (do_tcp6_gro) {
+			i += gro_tcp6_tbl_timeout_flush(&tcp6_tbl, 0, 
+					&pkts[i], nb_pkts - i);
 		}
-		nb_after_gro = i + unprocess_num;
 	}
 
 	return nb_after_gro;
@@ -323,13 +362,13 @@ rte_gro_reassemble(struct rte_mbuf **pkts,
 {
 	struct rte_mbuf *unprocess_pkts[nb_pkts];
 	struct gro_ctx *gro_ctx = ctx;
-	void *tcp_tbl, *udp_tbl, *vxlan_tcp_tbl, *vxlan_udp_tbl;
+	void *tcp_tbl, *udp_tbl, *vxlan_tcp_tbl, *vxlan_udp_tbl, *tcp6_tbl;
 	uint64_t current_time;
 	uint16_t i, unprocess_num = 0;
-	uint8_t do_tcp4_gro, do_vxlan_tcp_gro, do_udp4_gro, do_vxlan_udp_gro;
+	uint8_t do_tcp4_gro, do_vxlan_tcp_gro, do_udp4_gro, do_vxlan_udp_gro, do_tcp6_gro;
 
 	if (unlikely((gro_ctx->gro_types & (RTE_GRO_IPV4_VXLAN_TCP_IPV4 |
-					RTE_GRO_TCP_IPV4 |
+					RTE_GRO_TCP_IPV4 | RTE_GRO_TCP_IPV6 | 
 					RTE_GRO_IPV4_VXLAN_UDP_IPV4 |
 					RTE_GRO_UDP_IPV4)) == 0))
 		return nb_pkts;
@@ -338,6 +377,7 @@ rte_gro_reassemble(struct rte_mbuf **pkts,
 	vxlan_tcp_tbl = gro_ctx->tbls[RTE_GRO_IPV4_VXLAN_TCP_IPV4_INDEX];
 	udp_tbl = gro_ctx->tbls[RTE_GRO_UDP_IPV4_INDEX];
 	vxlan_udp_tbl = gro_ctx->tbls[RTE_GRO_IPV4_VXLAN_UDP_IPV4_INDEX];
+	tcp6_tbl = gro_ctx->tbls[RTE_GRO_TCP_IPV6_INDEX];
 
 	do_tcp4_gro = (gro_ctx->gro_types & RTE_GRO_TCP_IPV4) ==
 		RTE_GRO_TCP_IPV4;
@@ -347,6 +387,7 @@ rte_gro_reassemble(struct rte_mbuf **pkts,
 		RTE_GRO_UDP_IPV4;
 	do_vxlan_udp_gro = (gro_ctx->gro_types & RTE_GRO_IPV4_VXLAN_UDP_IPV4) ==
 		RTE_GRO_IPV4_VXLAN_UDP_IPV4;
+	do_tcp6_gro = (gro_ctx->gro_types & RTE_GRO_TCP_IPV6) == RTE_GRO_TCP_IPV6;
 
 	current_time = rte_rdtsc();
 
@@ -371,7 +412,13 @@ rte_gro_reassemble(struct rte_mbuf **pkts,
 			if (gro_udp4_reassemble(pkts[i], udp_tbl,
 						current_time) < 0)
 				unprocess_pkts[unprocess_num++] = pkts[i];
-		} else
+		} else if (IS_IPV6_TCP_PKT(pkts[i]->packet_type) && 
+				do_tcp6_gro) {
+			if (gro_tcp6_reassemble(pkts[i], tcp6_tbl, 
+						current_time) < 0)
+				unprocess_pkts[unprocess_num++] = pkts[i];
+		}
+		else
 			unprocess_pkts[unprocess_num++] = pkts[i];
 	}
 	if (unprocess_num > 0) {
@@ -426,6 +473,15 @@ rte_gro_timeout_flush(void *ctx,
 				gro_ctx->tbls[RTE_GRO_UDP_IPV4_INDEX],
 				flush_timestamp,
 				&out[num], left_nb_out);
+		left_nb_out = max_nb_out - num;
+	}
+
+	if ((gro_types & RTE_GRO_TCP_IPV6) && left_nb_out > 0) {
+		num += gro_tcp6_tbl_timeout_flush(
+				gro_ctx->tbls[RTE_GRO_TCP_IPV6_INDEX],
+				flush_timestamp,
+				&out[num], left_nb_out);
+
 	}
 
 	return num;
diff --git a/lib/gro/rte_gro.h b/lib/gro/rte_gro.h
index 9f9ed4935a..ac5a464cf1 100644
--- a/lib/gro/rte_gro.h
+++ b/lib/gro/rte_gro.h
@@ -37,6 +37,9 @@ extern "C" {
 /**< UDP/IPv4 GRO flag */
 #define RTE_GRO_IPV4_VXLAN_UDP_IPV4_INDEX 3
 #define RTE_GRO_IPV4_VXLAN_UDP_IPV4 (1ULL << RTE_GRO_IPV4_VXLAN_UDP_IPV4_INDEX)
+
+#define RTE_GRO_TCP_IPV6_INDEX 4
+#define RTE_GRO_TCP_IPV6 (1ULL << RTE_GRO_TCP_IPV6_INDEX)
 /**< VxLAN UDP/IPv4 GRO flag. */
 
 /**
-- 
2.25.1