Re: [PATCH v3 2/2] gro: support VxLAN GRO

["Chen, Junjie J" <junjie.j.chen@intel.com>]

Hi Jiayu

> -----Original Message-----
> From: Hu, Jiayu
> Sent: Friday, December 22, 2017 3:26 PM
> To: dev@dpdk.org
> Cc: Tan, Jianfeng <jianfeng.tan@intel.com>; Chen, Junjie J
> <junjie.j.chen@intel.com>; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>; stephen@networkplumber.org; Yigit,
> Ferruh <ferruh.yigit@intel.com>; Yao, Lei A <lei.a.yao@intel.com>; Hu, Jiayu
> <jiayu.hu@intel.com>
> Subject: [PATCH v3 2/2] gro: support VxLAN GRO
> 
> This patch adds a framework that allows GRO on tunneled packets.
> Furthermore, it leverages that framework to provide GRO support for
> VxLAN-encapsulated packets. Supported VxLAN packets must have an outer
> IPv4 header, and contain an inner TCP/IPv4 packet.
> 
> VxLAN GRO doesn't check if input packets have correct checksums and
> doesn't update checksums for output packets. Additionally, it assumes the
> packets are complete (i.e., MF==0 && frag_off==0), when IP fragmentation is
> possible (i.e., DF==0).
> 
> Signed-off-by: Jiayu Hu <jiayu.hu@intel.com>
> ---
>  .../prog_guide/generic_receive_offload_lib.rst     |  31 +-
>  lib/librte_gro/Makefile                            |   1 +
>  lib/librte_gro/gro_vxlan_tcp4.c                    | 515
> +++++++++++++++++++++
>  lib/librte_gro/gro_vxlan_tcp4.h                    | 184 ++++++++
>  lib/librte_gro/rte_gro.c                           | 129 +++++-
>  lib/librte_gro/rte_gro.h                           |   5 +-
>  6 files changed, 837 insertions(+), 28 deletions(-)  create mode 100644
> lib/librte_gro/gro_vxlan_tcp4.c  create mode 100644
> lib/librte_gro/gro_vxlan_tcp4.h
> 
> diff --git a/doc/guides/prog_guide/generic_receive_offload_lib.rst
> b/doc/guides/prog_guide/generic_receive_offload_lib.rst
> index c2d7a41..078bec0 100644
> --- a/doc/guides/prog_guide/generic_receive_offload_lib.rst
> +++ b/doc/guides/prog_guide/generic_receive_offload_lib.rst
> @@ -57,7 +57,9 @@ assumes the packets are complete (i.e., MF==0 &&
> frag_off==0), when IP  fragmentation is possible (i.e., DF==0). Additionally, it
> complies RFC
>  6864 to process the IPv4 ID field.
> 
> -Currently, the GRO library provides GRO supports for TCP/IPv4 packets.
> +Currently, the GRO library provides GRO supports for TCP/IPv4 packets
> +and VxLAN packets which contain an outer IPv4 header and an inner
> +TCP/IPv4 packet.
> 
>  Two Sets of API
>  ---------------
> @@ -108,7 +110,8 @@ Reassembly Algorithm
> 
>  The reassembly algorithm is used for reassembling packets. In the GRO
> library, different GRO types can use different algorithms. In this -section, we
> will introduce an algorithm, which is used by TCP/IPv4 GRO.
> +section, we will introduce an algorithm, which is used by TCP/IPv4 GRO
> +and VxLAN GRO.
> 
>  Challenges
>  ~~~~~~~~~~
> @@ -185,6 +188,30 @@ Header fields deciding if two packets are neighbors
> include:
>  - IPv4 ID. The IPv4 ID fields of the packets, whose DF bit is 0, should
>    be increased by 1.
> 
> +VxLAN GRO
> +---------
> +
> +The table structure used by VxLAN GRO, which is in charge of processing
> +VxLAN packets with an outer IPv4 header and inner TCP/IPv4 packet, is
> +similar with that of TCP/IPv4 GRO. Differently, the header fields used
> +to define a VxLAN flow include:
> +
> +- outer source and destination: Ethernet and IP address, UDP port
> +
> +- VxLAN header (VNI and flag)
> +
> +- inner source and destination: Ethernet and IP address, TCP port
> +
> +Header fields deciding if packets are neighbors include:
> +
> +- outer IPv4 ID. The IPv4 ID fields of the packets, whose DF bit in the
> +  outer IPv4 header is 0, should be increased by 1.
> +
> +- inner TCP sequence number
> +
> +- inner IPv4 ID. The IPv4 ID fields of the packets, whose DF bit in the
> +  inner IPv4 header is 0, should be increased by 1.
> +
>  .. note::
>          We comply RFC 6864 to process the IPv4 ID field. Specifically,
>          we check IPv4 ID fields for the packets whose DF bit is 0 and diff
> --git a/lib/librte_gro/Makefile b/lib/librte_gro/Makefile index
> eb423cc..0110455 100644
> --- a/lib/librte_gro/Makefile
> +++ b/lib/librte_gro/Makefile
> @@ -45,6 +45,7 @@ LIBABIVER := 1
>  # source files
>  SRCS-$(CONFIG_RTE_LIBRTE_GRO) += rte_gro.c
>  SRCS-$(CONFIG_RTE_LIBRTE_GRO) += gro_tcp4.c
> +SRCS-$(CONFIG_RTE_LIBRTE_GRO) += gro_vxlan_tcp4.c
> 
>  # install this header file
>  SYMLINK-$(CONFIG_RTE_LIBRTE_GRO)-include += rte_gro.h diff --git
> a/lib/librte_gro/gro_vxlan_tcp4.c b/lib/librte_gro/gro_vxlan_tcp4.c new file
> mode 100644 index 0000000..6567779
> --- /dev/null
> +++ b/lib/librte_gro/gro_vxlan_tcp4.c
> @@ -0,0 +1,515 @@
> +/*-
> + *   BSD LICENSE
> + *
> + *   Copyright(c) 2017 Intel Corporation. All rights reserved.
> + *
> + *   Redistribution and use in source and binary forms, with or without
> + *   modification, are permitted provided that the following conditions
> + *   are met:
> + *
> + *     * Redistributions of source code must retain the above copyright
> + *       notice, this list of conditions and the following disclaimer.
> + *     * Redistributions in binary form must reproduce the above copyright
> + *       notice, this list of conditions and the following disclaimer in
> + *       the documentation and/or other materials provided with the
> + *       distribution.
> + *     * Neither the name of Intel Corporation nor the names of its
> + *       contributors may be used to endorse or promote products
> derived
> + *       from this software without specific prior written permission.
> + *
> + *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
> CONTRIBUTORS
> + *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
> NOT
> + *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
> FITNESS FOR
> + *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
> COPYRIGHT
> + *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
> INCIDENTAL,
> + *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
> BUT NOT
> + *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
> LOSS OF USE,
> + *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
> AND ON ANY
> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
> TORT
> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
> OF THE USE
> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
> DAMAGE.
> + */
> +
> +#include <rte_malloc.h>
> +#include <rte_mbuf.h>
> +#include <rte_cycles.h>
> +#include <rte_ethdev.h>
> +#include <rte_udp.h>
> +
> +#include "gro_vxlan_tcp4.h"
> +
> +void *
> +gro_vxlan_tcp4_tbl_create(uint16_t socket_id,
> +		uint16_t max_flow_num,
> +		uint16_t max_item_per_flow)
> +{
> +	struct gro_vxlan_tcp4_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_VXLAN_TCP4_TBL_MAX_ITEM_NUM);
> +
> +	if (entries_num == 0)
> +		return NULL;
> +
> +	tbl = rte_zmalloc_socket(__func__,
> +			sizeof(struct gro_vxlan_tcp4_tbl),
> +			RTE_CACHE_LINE_SIZE,
> +			socket_id);
> +	if (tbl == NULL)
> +		return NULL;
> +
> +	size = sizeof(struct gro_vxlan_tcp4_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_vxlan_tcp4_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;
> +	}
> +
> +	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_vxlan_tcp4_tbl_destroy(void *tbl)
> +{
> +	struct gro_vxlan_tcp4_tbl *vxlan_tbl = tbl;
> +
> +	if (vxlan_tbl) {
> +		rte_free(vxlan_tbl->items);
> +		rte_free(vxlan_tbl->flows);
> +	}
> +	rte_free(vxlan_tbl);

What if vxlan_tbl=NULL, free? This should be moved into if block and may also add NULL check for items and flows also.

> +}
> +
> +static inline uint32_t
> +find_an_empty_item(struct gro_vxlan_tcp4_tbl *tbl) {
> +	uint32_t max_item_num = tbl->max_item_num, i;
> +
> +	for (i = 0; i < max_item_num; i++)
> +		if (tbl->items[i].inner_item.firstseg == NULL)
> +			return i;
> +	return INVALID_ARRAY_INDEX;
> +}
> +
> +static inline uint32_t
> +find_an_empty_flow(struct gro_vxlan_tcp4_tbl *tbl) {
> +	uint32_t max_flow_num = tbl->max_flow_num, i;
> +
> +	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_vxlan_tcp4_tbl *tbl,
> +		struct rte_mbuf *pkt,
> +		uint64_t start_time,
> +		uint32_t prev_idx,
> +		uint32_t sent_seq,
> +		uint16_t outer_ip_id,
> +		uint16_t ip_id,
> +		uint8_t outer_is_atomic,
> +		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].inner_item.firstseg = pkt;
> +	tbl->items[item_idx].inner_item.lastseg = rte_pktmbuf_lastseg(pkt);
> +	tbl->items[item_idx].inner_item.start_time = start_time;
> +	tbl->items[item_idx].inner_item.next_pkt_idx = INVALID_ARRAY_INDEX;
> +	tbl->items[item_idx].inner_item.sent_seq = sent_seq;
> +	tbl->items[item_idx].inner_item.ip_id = ip_id;
> +	tbl->items[item_idx].inner_item.nb_merged = 1;
> +	tbl->items[item_idx].inner_item.is_atomic = is_atomic;
> +	tbl->items[item_idx].outer_ip_id = outer_ip_id;
> +	tbl->items[item_idx].outer_is_atomic = outer_is_atomic;
> +	tbl->item_num++;
> +
> +	/* If the previous packet exists, chain the new one with it. */
> +	if (prev_idx != INVALID_ARRAY_INDEX) {
> +		tbl->items[item_idx].inner_item.next_pkt_idx =
> +			tbl->items[prev_idx].inner_item.next_pkt_idx;
> +		tbl->items[prev_idx].inner_item.next_pkt_idx = item_idx;
> +	}
> +
> +	return item_idx;
> +}
> +
> +static inline uint32_t
> +delete_item(struct gro_vxlan_tcp4_tbl *tbl,
> +		uint32_t item_idx,
> +		uint32_t prev_item_idx)
> +{
> +	uint32_t next_idx = tbl->items[item_idx].inner_item.next_pkt_idx;
> +
> +	/* NULL indicates an empty item. */
> +	tbl->items[item_idx].inner_item.firstseg = NULL;
> +	tbl->item_num--;
> +	if (prev_item_idx != INVALID_ARRAY_INDEX)
> +		tbl->items[prev_item_idx].inner_item.next_pkt_idx = next_idx;
> +
> +	return next_idx;
> +}
> +
> +static inline uint32_t
> +insert_new_flow(struct gro_vxlan_tcp4_tbl *tbl,
> +		struct vxlan_tcp4_flow_key *src,
> +		uint32_t item_idx)
> +{
> +	struct vxlan_tcp4_flow_key *dst;
> +	uint32_t flow_idx;
> +
> +	flow_idx = find_an_empty_flow(tbl);
> +	if (flow_idx == INVALID_ARRAY_INDEX)
> +		return INVALID_ARRAY_INDEX;
> +
> +	dst = &(tbl->flows[flow_idx].key);
> +
> +	ether_addr_copy(&(src->inner_key.eth_saddr),
> +			&(dst->inner_key.eth_saddr));
> +	ether_addr_copy(&(src->inner_key.eth_daddr),
> +			&(dst->inner_key.eth_daddr));
> +	dst->inner_key.ip_src_addr = src->inner_key.ip_src_addr;
> +	dst->inner_key.ip_dst_addr = src->inner_key.ip_dst_addr;
> +	dst->inner_key.recv_ack = src->inner_key.recv_ack;
> +	dst->inner_key.src_port = src->inner_key.src_port;
> +	dst->inner_key.dst_port = src->inner_key.dst_port;
> +
> +	dst->vxlan_hdr.vx_flags = src->vxlan_hdr.vx_flags;
> +	dst->vxlan_hdr.vx_vni = src->vxlan_hdr.vx_vni;
> +	ether_addr_copy(&(src->outer_eth_saddr), &(dst->outer_eth_saddr));
> +	ether_addr_copy(&(src->outer_eth_daddr), &(dst->outer_eth_daddr));
> +	dst->outer_ip_src_addr = src->outer_ip_src_addr;
> +	dst->outer_ip_dst_addr = src->outer_ip_dst_addr;
> +	dst->outer_src_port = src->outer_src_port;
> +	dst->outer_dst_port = src->outer_dst_port;
> +
> +	tbl->flows[flow_idx].start_index = item_idx;
> +	tbl->flow_num++;
> +
> +	return flow_idx;
> +}
> +
> +static inline int
> +is_same_vxlan_tcp4_flow(struct vxlan_tcp4_flow_key k1,
> +		struct vxlan_tcp4_flow_key k2)
> +{
> +	return (is_same_ether_addr(&k1.outer_eth_saddr,
> &k2.outer_eth_saddr) &&
> +			is_same_ether_addr(&k1.outer_eth_daddr,
> +				&k2.outer_eth_daddr) &&
> +			(k1.outer_ip_src_addr == k2.outer_ip_src_addr) &&
> +			(k1.outer_ip_dst_addr == k2.outer_ip_dst_addr) &&
> +			(k1.outer_src_port == k2.outer_src_port) &&
> +			(k1.outer_dst_port == k2.outer_dst_port) &&
> +			(k1.vxlan_hdr.vx_flags == k2.vxlan_hdr.vx_flags) &&
> +			(k1.vxlan_hdr.vx_vni == k2.vxlan_hdr.vx_vni) &&
> +			is_same_tcp4_flow(k1.inner_key, k2.inner_key)); }
> +
> +static inline int
> +check_vxlan_seq_option(struct gro_vxlan_tcp4_item *item,
> +		struct tcp_hdr *tcp_hdr,
> +		uint32_t sent_seq,
> +		uint16_t outer_ip_id,
> +		uint16_t ip_id,
> +		uint16_t tcp_hl,
> +		uint16_t tcp_dl,
> +		uint8_t outer_is_atomic,
> +		uint8_t is_atomic)
> +{
> +	struct rte_mbuf *pkt = item->inner_item.firstseg;
> +	int cmp;
> +	uint16_t l2_offset;
> +
> +	/* Don't merge packets whose outer DF bits are different. */
> +	if (unlikely(item->outer_is_atomic ^ outer_is_atomic))
> +		return 0;
> +
> +	l2_offset = pkt->outer_l2_len + pkt->outer_l3_len;
> +	cmp = check_seq_option(&item->inner_item, tcp_hdr, sent_seq, ip_id,
> +			tcp_hl, tcp_dl, l2_offset, is_atomic);
> +	if ((cmp == 1) && (outer_is_atomic ||
> +				(outer_ip_id == item->outer_ip_id +
> +				 item->inner_item.nb_merged)))
> +		/* Append the packet. */
> +		return 1;
> +	else if ((cmp == -1) && (outer_is_atomic ||
> +				(outer_ip_id + 1 == item->outer_ip_id)))
> +		/* Prepend the packet. */
> +		return -1;
> +
> +	return 0;
> +}
> +
> +static inline int
> +merge_two_vxlan_tcp4_packets(struct gro_vxlan_tcp4_item *item,
> +		struct rte_mbuf *pkt,
> +		int cmp,
> +		uint32_t sent_seq,
> +		uint16_t outer_ip_id,
> +		uint16_t ip_id)
> +{
> +	if (merge_two_tcp4_packets(&item->inner_item, pkt, cmp, sent_seq,
> +				ip_id, pkt->outer_l2_len +
> +				pkt->outer_l3_len)) {
> +		item->outer_ip_id = cmp < 0 ? outer_ip_id : item->outer_ip_id;
> +		return 1;
> +	}
> +
> +	return 0;
> +}
> +
> +static inline void
> +update_vxlan_header(struct gro_vxlan_tcp4_item *item) {
> +	struct ipv4_hdr *ipv4_hdr;
> +	struct udp_hdr *udp_hdr;
> +	struct rte_mbuf *pkt = item->inner_item.firstseg;
> +	uint16_t len;
> +
> +	/* Update the outer IPv4 header. */
> +	len = pkt->pkt_len - pkt->outer_l2_len;
> +	ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
> +			pkt->outer_l2_len);
> +	ipv4_hdr->total_length = rte_cpu_to_be_16(len);
> +
> +	/* Update the outer UDP header. */
> +	len -= pkt->outer_l3_len;
> +	udp_hdr = (struct udp_hdr *)((char *)ipv4_hdr + pkt->outer_l3_len);
> +	udp_hdr->dgram_len = rte_cpu_to_be_16(len);
> +
> +	/* Update the inner IPv4 header. */
> +	len -= pkt->l2_len;
> +	ipv4_hdr = (struct ipv4_hdr *)((char *)udp_hdr + pkt->l2_len);
> +	ipv4_hdr->total_length = rte_cpu_to_be_16(len); }
> +
> +int32_t
> +gro_vxlan_tcp4_reassemble(struct rte_mbuf *pkt,
> +		struct gro_vxlan_tcp4_tbl *tbl,
> +		uint64_t start_time)
> +{
> +	struct ether_hdr *outer_eth_hdr, *eth_hdr;
> +	struct ipv4_hdr *outer_ipv4_hdr, *ipv4_hdr;
> +	struct tcp_hdr *tcp_hdr;
> +	struct udp_hdr *udp_hdr;
> +	struct vxlan_hdr *vxlan_hdr;
> +	uint32_t sent_seq;
> +	uint16_t tcp_dl, frag_off, outer_ip_id, ip_id;
> +	uint8_t outer_is_atomic, is_atomic;
> +
> +	struct vxlan_tcp4_flow_key key;
> +	uint32_t cur_idx, prev_idx, item_idx;
> +	uint32_t i, max_flow_num;
> +	int cmp;
> +	uint16_t hdr_len;
> +
> +	outer_eth_hdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *);
> +	outer_ipv4_hdr = (struct ipv4_hdr *)((char *)outer_eth_hdr +
> +			pkt->outer_l2_len);
> +	udp_hdr = (struct udp_hdr *)((char *)outer_ipv4_hdr +
> +			pkt->outer_l3_len);
> +	vxlan_hdr = (struct vxlan_hdr *)((char *)udp_hdr +
> +			sizeof(struct udp_hdr));
> +	eth_hdr = (struct ether_hdr *)((char *)vxlan_hdr +
> +			sizeof(struct vxlan_hdr));
> +	ipv4_hdr = (struct ipv4_hdr *)((char *)udp_hdr + pkt->l2_len);
> +	tcp_hdr = (struct tcp_hdr *)((char *)ipv4_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 != TCP_ACK_FLAG)
> +		return -1;
> +
> +	hdr_len = pkt->outer_l2_len + pkt->outer_l3_len + pkt->l2_len +
> +		pkt->l3_len + pkt->l4_len;
> +	/*
> +	 * Don't process the packet whose payload length is less than or
> +	 * equal to 0.
> +	 */
> +	tcp_dl = pkt->pkt_len - hdr_len;
> +	if (tcp_dl <= 0)
> +		return -1;
> +
> +	/*
> +	 * Save IPv4 ID for the packet whose DF bit is 0. For the packet
> +	 * whose DF bit is 1, IPv4 ID is ignored.
> +	 */
> +	frag_off = rte_be_to_cpu_16(outer_ipv4_hdr->fragment_offset);
> +	outer_is_atomic = (frag_off & IPV4_HDR_DF_FLAG) ==
> IPV4_HDR_DF_FLAG;
> +	outer_ip_id = outer_is_atomic ? 0 :
> +		rte_be_to_cpu_16(outer_ipv4_hdr->packet_id);
> +	frag_off = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
> +	is_atomic = (frag_off & IPV4_HDR_DF_FLAG) == IPV4_HDR_DF_FLAG;
> +	ip_id = is_atomic ? 0 : rte_be_to_cpu_16(ipv4_hdr->packet_id);
> +
> +	sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
> +
> +	ether_addr_copy(&(eth_hdr->s_addr), &(key.inner_key.eth_saddr));
> +	ether_addr_copy(&(eth_hdr->d_addr), &(key.inner_key.eth_daddr));
> +	key.inner_key.ip_src_addr = ipv4_hdr->src_addr;
> +	key.inner_key.ip_dst_addr = ipv4_hdr->dst_addr;
> +	key.inner_key.recv_ack = tcp_hdr->recv_ack;
> +	key.inner_key.src_port = tcp_hdr->src_port;
> +	key.inner_key.dst_port = tcp_hdr->dst_port;
> +
> +	key.vxlan_hdr.vx_flags = vxlan_hdr->vx_flags;
> +	key.vxlan_hdr.vx_vni = vxlan_hdr->vx_vni;
> +	ether_addr_copy(&(outer_eth_hdr->s_addr), &(key.outer_eth_saddr));
> +	ether_addr_copy(&(outer_eth_hdr->d_addr), &(key.outer_eth_daddr));
> +	key.outer_ip_src_addr = outer_ipv4_hdr->src_addr;
> +	key.outer_ip_dst_addr = outer_ipv4_hdr->dst_addr;
> +	key.outer_src_port = udp_hdr->src_port;
> +	key.outer_dst_port = udp_hdr->dst_port;
> +
> +	/* Search for a matched flow. */
> +	max_flow_num = tbl->max_flow_num;
> +	for (i = 0; i < max_flow_num; i++) {
> +		if (tbl->flows[i].start_index != INVALID_ARRAY_INDEX &&
> +				is_same_vxlan_tcp4_flow(tbl->flows[i].key,
> +					key))
> +			break;
> +	}
> +
> +	/*
> +	 * Can't find a matched flow. Insert a new flow and store the
> +	 * packet into the flow.
> +	 */
> +	if (i == tbl->max_flow_num) {
> +		item_idx = insert_new_item(tbl, pkt, start_time,
> +				INVALID_ARRAY_INDEX, sent_seq, outer_ip_id,
> +				ip_id, outer_is_atomic, is_atomic);
> +		if (item_idx == INVALID_ARRAY_INDEX)
> +			return -1;
> +		if (insert_new_flow(tbl, &key, item_idx) ==
> +				INVALID_ARRAY_INDEX) {
> +			/*
> +			 * Fail to insert a new flow, so
> +			 * delete the inserted 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. */
> +	cur_idx = tbl->flows[i].start_index;
> +	prev_idx = cur_idx;
> +	do {
> +		cmp = check_vxlan_seq_option(&(tbl->items[cur_idx]), tcp_hdr,
> +				sent_seq, outer_ip_id, ip_id, pkt->l4_len,
> +				tcp_dl, outer_is_atomic, is_atomic);
> +		if (cmp) {
> +			if (merge_two_vxlan_tcp4_packets(&(tbl->items[cur_idx]),
> +						pkt, cmp, sent_seq,
> +						outer_ip_id, ip_id))
> +				return 1;
> +			/*
> +			 * Can't merge two packets, as the packet
> +			 * length will be greater than the max value.
> +			 * Insert the packet into the flow.
> +			 */
> +			if (insert_new_item(tbl, pkt, start_time, prev_idx,
> +						sent_seq, outer_ip_id,
> +						ip_id, outer_is_atomic,
> +						is_atomic) ==
> +					INVALID_ARRAY_INDEX)
> +				return -1;
> +			return 0;
> +		}
> +		prev_idx = cur_idx;
> +		cur_idx = tbl->items[cur_idx].inner_item.next_pkt_idx;
> +	} while (cur_idx != INVALID_ARRAY_INDEX);
> +
> +	/* Can't find neighbor. Insert the packet into the flow. */
> +	if (insert_new_item(tbl, pkt, start_time, prev_idx, sent_seq,
> +				outer_ip_id, ip_id, outer_is_atomic,
> +				is_atomic) == INVALID_ARRAY_INDEX)
> +		return -1;
> +
> +	return 0;
> +}
> +
> +uint16_t
> +gro_vxlan_tcp4_tbl_timeout_flush(struct gro_vxlan_tcp4_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].inner_item.start_time <=
> +					flush_timestamp) {
> +				out[k++] = tbl->items[j].inner_item.firstseg;
> +				if (tbl->items[j].inner_item.nb_merged > 1)
> +					update_vxlan_header(&(tbl->items[j]));
> +				/*
> +				 * Delete the item and get the next packet
> +				 * index.
> +				 */
> +				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 the flow won't be
> +				 * timeout. Go to check other flows.
> +				 */
> +				break;
> +		}
> +	}
> +	return k;
> +}
> +
> +uint32_t
> +gro_vxlan_tcp4_tbl_pkt_count(void *tbl) {
> +	struct gro_vxlan_tcp4_tbl *gro_tbl = tbl;
> +
> +	if (gro_tbl)
> +		return gro_tbl->item_num;
> +
> +	return 0;
> +}
> diff --git a/lib/librte_gro/gro_vxlan_tcp4.h b/lib/librte_gro/gro_vxlan_tcp4.h
> new file mode 100644 index 0000000..66baf73
> --- /dev/null
> +++ b/lib/librte_gro/gro_vxlan_tcp4.h
> @@ -0,0 +1,184 @@
> +/*-
> + *   BSD LICENSE
> + *
> + *   Copyright(c) 2017 Intel Corporation. All rights reserved.
> + *
> + *   Redistribution and use in source and binary forms, with or without
> + *   modification, are permitted provided that the following conditions
> + *   are met:
> + *
> + *     * Redistributions of source code must retain the above copyright
> + *       notice, this list of conditions and the following disclaimer.
> + *     * Redistributions in binary form must reproduce the above copyright
> + *       notice, this list of conditions and the following disclaimer in
> + *       the documentation and/or other materials provided with the
> + *       distribution.
> + *     * Neither the name of Intel Corporation nor the names of its
> + *       contributors may be used to endorse or promote products
> derived
> + *       from this software without specific prior written permission.
> + *
> + *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
> CONTRIBUTORS
> + *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
> NOT
> + *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
> FITNESS FOR
> + *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
> COPYRIGHT
> + *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
> INCIDENTAL,
> + *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
> BUT NOT
> + *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
> LOSS OF USE,
> + *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
> AND ON ANY
> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
> TORT
> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
> OF THE USE
> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
> DAMAGE.
> + */
> +
> +#ifndef _GRO_VXLAN_TCP4_H_
> +#define _GRO_VXLAN_TCP4_H_
> +
> +#include "gro_tcp4.h"
> +
> +#define GRO_VXLAN_TCP4_TBL_MAX_ITEM_NUM (1024UL * 1024UL)
> +
> +/* Header fields representing a VxLAN flow */ struct
> +vxlan_tcp4_flow_key {
> +	struct tcp4_flow_key inner_key;
> +	struct vxlan_hdr vxlan_hdr;
> +
> +	struct ether_addr outer_eth_saddr;
> +	struct ether_addr outer_eth_daddr;
> +
> +	uint32_t outer_ip_src_addr;
> +	uint32_t outer_ip_dst_addr;
> +
> +	/* Outer UDP ports */
> +	uint16_t outer_src_port;
> +	uint16_t outer_dst_port;
> +
> +};
> +
> +struct gro_vxlan_tcp4_flow {
> +	struct vxlan_tcp4_flow_key key;
> +	/*
> +	 * The index of the first packet in the flow. INVALID_ARRAY_INDEX
> +	 * indicates an empty flow.
> +	 */
> +	uint32_t start_index;
> +};
> +
> +struct gro_vxlan_tcp4_item {
> +	struct gro_tcp4_item inner_item;
> +	/* IPv4 ID in the outer IPv4 header */
> +	uint16_t outer_ip_id;
> +	/* Indicate if outer IPv4 ID can be ignored */
> +	uint8_t outer_is_atomic;
> +};
> +
> +/*
> + * VxLAN (with an outer IPv4 header and an inner TCP/IPv4 packet)
> + * reassembly table structure
> + */
> +struct gro_vxlan_tcp4_tbl {
> +	/* item array */
> +	struct gro_vxlan_tcp4_item *items;
> +	/* flow array */
> +	struct gro_vxlan_tcp4_flow *flows;
> +	/* current item number */
> +	uint32_t item_num;
> +	/* current flow number */
> +	uint32_t flow_num;
> +	/* the maximum item number */
> +	uint32_t max_item_num;
> +	/* the maximum flow number */
> +	uint32_t max_flow_num;
> +};
> +
> +/**
> + * This function creates a VxLAN reassembly table for VxLAN packets
> + * which have an outer IPv4 header and an inner TCP/IPv4 packet.
> + *
> + * @param socket_id
> + *  Socket index for allocating the table
> + * @param max_flow_num
> + *  The maximum number of flows in the 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_vxlan_tcp4_tbl_create(uint16_t socket_id,
> +		uint16_t max_flow_num,
> +		uint16_t max_item_per_flow);
> +
> +/**
> + * This function destroys a VxLAN reassembly table.
> + *
> + * @param tbl
> + *  Pointer pointing to the VxLAN reassembly table  */ void
> +gro_vxlan_tcp4_tbl_destroy(void *tbl);
> +
> +/**
> + * This function merges a VxLAN packet which has an outer IPv4 header
> +and
> + * an inner TCP/IPv4 packet. It doesn't process the packet, whose TCP
> + * header has SYN, FIN, RST, PSH, CWR, ECE or URG bit set, or which
> + * 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 VxLAN 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_vxlan_tcp4_reassemble(struct rte_mbuf *pkt,
> +		struct gro_vxlan_tcp4_tbl *tbl,
> +		uint64_t start_time);
> +
> +/**
> + * This function flushes timeout packets in the VxLAN reassembly table,
> + * and without updating checksums.
> + *
> + * @param tbl
> + *  Pointer pointing to a VxLAN GRO table
> + * @param flush_timestamp
> + *  This function flushes 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_vxlan_tcp4_tbl_timeout_flush(struct gro_vxlan_tcp4_tbl *tbl,
> +		uint64_t flush_timestamp,
> +		struct rte_mbuf **out,
> +		uint16_t nb_out);
> +
> +/**
> + * This function returns the number of the packets in a VxLAN
> + * reassembly table.
> + *
> + * @param tbl
> + *  Pointer pointing to the VxLAN reassembly table
> + *
> + * @return
> + *  The number of packets in the table
> + */
> +uint32_t gro_vxlan_tcp4_tbl_pkt_count(void *tbl); #endif
> diff --git a/lib/librte_gro/rte_gro.c b/lib/librte_gro/rte_gro.c index
> b3931a8..5a26893 100644
> --- a/lib/librte_gro/rte_gro.c
> +++ b/lib/librte_gro/rte_gro.c
> @@ -37,6 +37,7 @@
> 
>  #include "rte_gro.h"
>  #include "gro_tcp4.h"
> +#include "gro_vxlan_tcp4.h"
> 
>  typedef void *(*gro_tbl_create_fn)(uint16_t socket_id,
>  		uint16_t max_flow_num,
> @@ -45,15 +46,28 @@ typedef void (*gro_tbl_destroy_fn)(void *tbl);
> 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, NULL};
> +		gro_tcp4_tbl_create, gro_vxlan_tcp4_tbl_create, NULL};
>  static gro_tbl_destroy_fn tbl_destroy_fn[RTE_GRO_TYPE_MAX_NUM] = {
> -			gro_tcp4_tbl_destroy, NULL};
> +			gro_tcp4_tbl_destroy, gro_vxlan_tcp4_tbl_destroy,
> +			NULL};
>  static gro_tbl_pkt_count_fn tbl_pkt_count_fn[RTE_GRO_TYPE_MAX_NUM]
> = {
> -			gro_tcp4_tbl_pkt_count, NULL};
> +			gro_tcp4_tbl_pkt_count, gro_vxlan_tcp4_tbl_pkt_count,
> +			NULL};
> 
>  #define IS_IPV4_TCP_PKT(ptype) (RTE_ETH_IS_IPV4_HDR(ptype) && \
>  		((ptype & RTE_PTYPE_L4_TCP) == RTE_PTYPE_L4_TCP))
> 
> +#define IS_IPV4_VXLAN_TCP4_PKT(ptype) (RTE_ETH_IS_IPV4_HDR(ptype)
> && \
> +		((ptype & RTE_PTYPE_L4_UDP) == RTE_PTYPE_L4_UDP) && \
> +		((ptype & RTE_PTYPE_TUNNEL_VXLAN) == \
> +		 RTE_PTYPE_TUNNEL_VXLAN) && \
> +		 ((ptype & RTE_PTYPE_INNER_L4_TCP) == \
> +		  RTE_PTYPE_INNER_L4_TCP) && \
> +		  (((ptype & RTE_PTYPE_INNER_L3_MASK) & \
> +		    (RTE_PTYPE_INNER_L3_IPV4 | \
> +		     RTE_PTYPE_INNER_L3_IPV4_EXT | \
> +		     RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN)) != 0))
> +
>  /*
>   * GRO context structure. It keeps the table structures, which are
>   * used to merge packets, for different GRO types. Before using @@ -137,12
> +151,20 @@ rte_gro_reassemble_burst(struct rte_mbuf **pkts,
>  	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} };
> 
> +	/* Allocate a reassembly table for VXLAN GRO */
> +	struct gro_vxlan_tcp4_tbl vxlan_tbl;
> +	struct gro_vxlan_tcp4_flow
> vxlan_flows[RTE_GRO_MAX_BURST_ITEM_NUM];
> +	struct gro_vxlan_tcp4_item
> vxlan_items[RTE_GRO_MAX_BURST_ITEM_NUM] = {
> +		{{0}, 0, 0} };
> +
>  	struct rte_mbuf *unprocess_pkts[nb_pkts];
>  	uint32_t item_num;
>  	int32_t ret;
>  	uint16_t i, unprocess_num = 0, nb_after_gro = nb_pkts;
> +	uint8_t do_tcp4_gro = 0, do_vxlan_gro = 0;
> 
> -	if (unlikely((param->gro_types & RTE_GRO_TCP_IPV4) == 0))
> +	if (unlikely((param->gro_types & (RTE_GRO_IPV4_VXLAN_TCP_IPV4 |
> +					RTE_GRO_TCP_IPV4)) == 0))
>  		return nb_pkts;
> 
>  	/* Get the maximum number of packets */ @@ -150,22 +172,47 @@
> rte_gro_reassemble_burst(struct rte_mbuf **pkts,
>  				param->max_item_per_flow));
>  	item_num = RTE_MIN(item_num, RTE_GRO_MAX_BURST_ITEM_NUM);
> 
> -	for (i = 0; i < item_num; i++)
> -		tcp_flows[i].start_index = INVALID_ARRAY_INDEX;
> +	if (param->gro_types & RTE_GRO_IPV4_VXLAN_TCP_IPV4) {
> +		for (i = 0; i < item_num; i++)
> +			vxlan_flows[i].start_index = INVALID_ARRAY_INDEX;
> +
> +		vxlan_tbl.flows = vxlan_flows;
> +		vxlan_tbl.items = vxlan_items;
> +		vxlan_tbl.flow_num = 0;
> +		vxlan_tbl.item_num = 0;
> +		vxlan_tbl.max_flow_num = item_num;
> +		vxlan_tbl.max_item_num = item_num;
> +		do_vxlan_gro = 1;
> +	}
> 
> -	tcp_tbl.flows = tcp_flows;
> -	tcp_tbl.items = tcp_items;
> -	tcp_tbl.flow_num = 0;
> -	tcp_tbl.item_num = 0;
> -	tcp_tbl.max_flow_num = item_num;
> -	tcp_tbl.max_item_num = item_num;
> +	if (param->gro_types & RTE_GRO_TCP_IPV4) {
> +		for (i = 0; i < item_num; i++)
> +			tcp_flows[i].start_index = INVALID_ARRAY_INDEX;
> +
> +		tcp_tbl.flows = tcp_flows;
> +		tcp_tbl.items = tcp_items;
> +		tcp_tbl.flow_num = 0;
> +		tcp_tbl.item_num = 0;
> +		tcp_tbl.max_flow_num = item_num;
> +		tcp_tbl.max_item_num = item_num;
> +		do_tcp4_gro = 1;
> +	}
> 
>  	for (i = 0; i < nb_pkts; i++) {
> -		if (IS_IPV4_TCP_PKT(pkts[i]->packet_type)) {
> -			/*
> -			 * The timestamp is ignored, since all packets
> -			 * will be flushed from the tables.
> -			 */
> +		/*
> +		 * The timestamp is ignored, since all packets
> +		 * will be flushed from the tables.
> +		 */
> +		if (IS_IPV4_VXLAN_TCP4_PKT(pkts[i]->packet_type) &&
> +				do_vxlan_gro) {
> +			ret = gro_vxlan_tcp4_reassemble(pkts[i], &vxlan_tbl, 0);
> +			if (ret > 0)
> +				/* Merge successfully */
> +				nb_after_gro--;
> +			else if (ret < 0)
> +				unprocess_pkts[unprocess_num++] = pkts[i];
> +		} else if (IS_IPV4_TCP_PKT(pkts[i]->packet_type) &&
> +				do_tcp4_gro) {
>  			ret = gro_tcp4_reassemble(pkts[i], &tcp_tbl, 0);
>  			if (ret > 0)
>  				/* Merge successfully */
> @@ -177,8 +224,16 @@ rte_gro_reassemble_burst(struct rte_mbuf **pkts,
>  	}
> 
>  	if (nb_after_gro < nb_pkts) {
> +		i = 0;
>  		/* Flush all packets from the tables */
> -		i = gro_tcp4_tbl_timeout_flush(&tcp_tbl, 0, pkts, nb_pkts);
> +		if (do_vxlan_gro) {
> +			i = gro_vxlan_tcp4_tbl_timeout_flush(&vxlan_tbl,
> +					0, pkts, nb_pkts);
> +		}
> +		if (do_tcp4_gro) {
> +			i += gro_tcp4_tbl_timeout_flush(&tcp_tbl, 0,
> +					&pkts[i], nb_pkts - i);
> +		}
>  		/* Copy unprocessed packets */
>  		if (unprocess_num > 0) {
>  			memcpy(&pkts[i], unprocess_pkts,
> @@ -197,18 +252,33 @@ rte_gro_reassemble(struct rte_mbuf **pkts,  {
>  	struct rte_mbuf *unprocess_pkts[nb_pkts];
>  	struct gro_ctx *gro_ctx = ctx;
> -	void *tcp_tbl;
> +	void *tcp_tbl, *vxlan_tbl;
>  	uint64_t current_time;
>  	uint16_t i, unprocess_num = 0;
> +	uint8_t do_tcp4_gro, do_vxlan_gro;
> 
> -	if (unlikely((gro_ctx->gro_types & RTE_GRO_TCP_IPV4) == 0))
> +	if (unlikely((gro_ctx->gro_types & (RTE_GRO_IPV4_VXLAN_TCP_IPV4 |
> +					RTE_GRO_TCP_IPV4)) == 0))
>  		return nb_pkts;
> 
>  	tcp_tbl = gro_ctx->tbls[RTE_GRO_TCP_IPV4_INDEX];
> +	vxlan_tbl = gro_ctx->tbls[RTE_GRO_IPV4_VXLAN_TCP_IPV4_INDEX];
> +
> +	do_tcp4_gro = (gro_ctx->gro_types & RTE_GRO_TCP_IPV4) ==
> +		RTE_GRO_TCP_IPV4;
> +	do_vxlan_gro = (gro_ctx->gro_types & RTE_GRO_IPV4_VXLAN_TCP_IPV4)
> ==
> +		RTE_GRO_IPV4_VXLAN_TCP_IPV4;
> +
>  	current_time = rte_rdtsc();
> 
>  	for (i = 0; i < nb_pkts; i++) {
> -		if (IS_IPV4_TCP_PKT(pkts[i]->packet_type)) {
> +		if (IS_IPV4_VXLAN_TCP4_PKT(pkts[i]->packet_type) &&
> +				do_vxlan_gro) {
> +			if (gro_vxlan_tcp4_reassemble(pkts[i], vxlan_tbl,
> +						current_time) < 0)
> +				unprocess_pkts[unprocess_num++] = pkts[i];
> +		} else if (IS_IPV4_TCP_PKT(pkts[i]->packet_type) &&
> +				do_tcp4_gro) {
>  			if (gro_tcp4_reassemble(pkts[i], tcp_tbl,
>  						current_time) < 0)
>  				unprocess_pkts[unprocess_num++] = pkts[i]; @@ -232,18
> +302,27 @@ rte_gro_timeout_flush(void *ctx,  {
>  	struct gro_ctx *gro_ctx = ctx;
>  	uint64_t flush_timestamp;
> +	uint16_t num = 0;
> 
>  	gro_types = gro_types & gro_ctx->gro_types;
>  	flush_timestamp = rte_rdtsc() - timeout_cycles;
> 
> -	if (gro_types & RTE_GRO_TCP_IPV4) {
> -		return gro_tcp4_tbl_timeout_flush(
> +	if (gro_types & RTE_GRO_IPV4_VXLAN_TCP_IPV4) {
> +		num = gro_vxlan_tcp4_tbl_timeout_flush(gro_ctx->tbls[
> +				RTE_GRO_IPV4_VXLAN_TCP_IPV4_INDEX],
> +				flush_timestamp, out, max_nb_out);
> +		max_nb_out -= num;
> +	}
> +
> +	/* If no available space in 'out', stop flushing. */
> +	if ((gro_types & RTE_GRO_TCP_IPV4) && max_nb_out > 0) {
> +		num += gro_tcp4_tbl_timeout_flush(
>  				gro_ctx->tbls[RTE_GRO_TCP_IPV4_INDEX],
>  				flush_timestamp,
> -				out, max_nb_out);
> +				&out[num], max_nb_out);
>  	}
> 
> -	return 0;
> +	return num;
>  }
> 
>  uint64_t
> diff --git a/lib/librte_gro/rte_gro.h b/lib/librte_gro/rte_gro.h index
> 36a1e60..5ed72d7 100644
> --- a/lib/librte_gro/rte_gro.h
> +++ b/lib/librte_gro/rte_gro.h
> @@ -51,12 +51,15 @@ extern "C" {
>   */
>  #define RTE_GRO_TYPE_MAX_NUM 64
>  /**< the max number of supported GRO types */ -#define
> RTE_GRO_TYPE_SUPPORT_NUM 1
> +#define RTE_GRO_TYPE_SUPPORT_NUM 2
>  /**< the number of currently supported GRO types */
> 
>  #define RTE_GRO_TCP_IPV4_INDEX 0
>  #define RTE_GRO_TCP_IPV4 (1ULL << RTE_GRO_TCP_IPV4_INDEX)  /**<
> TCP/IPv4 GRO flag */
> +#define RTE_GRO_IPV4_VXLAN_TCP_IPV4_INDEX 1 #define
> +RTE_GRO_IPV4_VXLAN_TCP_IPV4 (1ULL <<
> RTE_GRO_IPV4_VXLAN_TCP_IPV4_INDEX)
> +/**< VxLAN GRO flag. */
> 
>  /**
>   * Structure used to create GRO context objects or used to pass
> --
> 2.7.4