Re: [dpdk-dev] [PATCH v4 1/2] gro: add UDP GRO support

[yang_y_yi <yang_y_yi@163.com>]

This is incremental patch to fix your new comments, I'll send out v5 if no more comments here.



diff --git a/lib/librte_gro/gro_udp4.c b/lib/librte_gro/gro_udp4.c

index 25584fd..061e7b0 100644
--- a/lib/librte_gro/gro_udp4.c
+++ b/lib/librte_gro/gro_udp4.c
@@ -107,7 +107,7 @@
        uint32_t item_idx;

        item_idx = find_an_empty_item(tbl);
-       if (item_idx == INVALID_ARRAY_INDEX)
+       if (unlikely(item_idx == INVALID_ARRAY_INDEX))
                return INVALID_ARRAY_INDEX;

        tbl->items[item_idx].firstseg = pkt;
@@ -163,7 +163,6 @@
        dst->ip_src_addr = src->ip_src_addr;
        dst->ip_dst_addr = src->ip_dst_addr;
        dst->ip_id = src->ip_id;
-       dst->ip_id = src->ip_id;

        tbl->flows[flow_idx].start_index = item_idx;
        tbl->flow_num++;
@@ -226,10 +225,14 @@
         * Don't process the packet whose payload length is less than or
         * equal to 0.
         */
-       if (pkt->pkt_len - hdr_len <= 0)
+       if (pkt->pkt_len <= hdr_len)
+               return -1;
+
+       ip_dl = rte_be_to_cpu_16(ipv4_hdr->total_length);
+       if (ip_dl <= pkt->l3_len)
                return -1;

-       ip_dl = rte_be_to_cpu_16(ipv4_hdr->total_length) - pkt->l3_len;
+       ip_dl -= pkt->l3_len;
        ip_id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
        frag_offset = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
        is_last_frag = ((frag_offset & RTE_IPV4_HDR_MF_FLAG) == 0) ? 1 : 0;
@@ -263,7 +266,7 @@
                item_idx = insert_new_item(tbl, pkt, start_time,
                                INVALID_ARRAY_INDEX, frag_offset,
                                is_last_frag);
-               if (item_idx == INVALID_ARRAY_INDEX)
+               if (unlikely(item_idx == INVALID_ARRAY_INDEX))
                        return -1;
                if (insert_new_flow(tbl, &key, item_idx) ==
                                INVALID_ARRAY_INDEX) {
@@ -284,7 +287,7 @@
        cur_idx = tbl->flows[i].start_index;
        prev_idx = cur_idx;
        do {
-               cmp = udp_check_neighbor(&(tbl->items[cur_idx]),
+               cmp = udp4_check_neighbor(&(tbl->items[cur_idx]),
                                frag_offset, ip_dl, 0);
                if (cmp) {
                        if (merge_two_udp4_packets(&(tbl->items[cur_idx]),
@@ -319,7 +322,7 @@
                item_idx = insert_new_item(tbl, pkt, start_time,
                                INVALID_ARRAY_INDEX, frag_offset,
                                is_last_frag);
-               if (item_idx == INVALID_ARRAY_INDEX)
+               if (unlikely(item_idx == INVALID_ARRAY_INDEX))
                        return -1;
                tbl->items[item_idx].next_pkt_idx = cur_idx;
                tbl->flows[i].start_index = item_idx;
@@ -348,12 +351,11 @@
        item_idx = tbl->items[start_idx].next_pkt_idx;
        while (item_idx != INVALID_ARRAY_INDEX) {
                pkt = tbl->items[item_idx].firstseg;
-               hdr_len = pkt->outer_l2_len + pkt->outer_l3_len + pkt->l2_len +
-                       pkt->l3_len;
+               hdr_len = pkt->l2_len + pkt->l3_len;
                ip_dl = pkt->pkt_len - hdr_len;
                frag_offset = tbl->items[item_idx].frag_offset;
                is_last_frag = tbl->items[item_idx].is_last_frag;
-               cmp = udp_check_neighbor(&(tbl->items[start_idx]),
+               cmp = udp4_check_neighbor(&(tbl->items[start_idx]),
                                        frag_offset, ip_dl, 0);
                if (cmp) {
                        if (merge_two_udp4_packets(
@@ -364,12 +366,10 @@
                                                        INVALID_ARRAY_INDEX);
                                tbl->items[start_idx].next_pkt_idx
                                        = item_idx;
-                       } else {
+                       } else
                                return 0;
-                       }
-               } else {
+               } else
                        return 0;
-               }
        }

        return 0;
diff --git a/lib/librte_gro/gro_udp4.h b/lib/librte_gro/gro_udp4.h
index bc67eb1..0a078e4 100644
--- a/lib/librte_gro/gro_udp4.h
+++ b/lib/librte_gro/gro_udp4.h
@@ -246,7 +246,7 @@ uint16_t gro_udp4_tbl_timeout_flush(struct gro_udp4_tbl *tbl,
  * Check if two UDP/IPv4 packets are neighbors.
  */
 static inline int
-udp_check_neighbor(struct gro_udp4_item *item,
+udp4_check_neighbor(struct gro_udp4_item *item,
                uint16_t frag_offset,
                uint16_t ip_dl,
                uint16_t l2_offset)


















At 2020-09-09 15:25:10, "yang_y_yi" <yang_y_yi@163.com> wrote:
>
>
>At 2020-09-08 10:05:16, "Jiayu Hu" <jiayu.hu@intel.com> wrote:
>>Some comments are inline.
>
>Thanks, replies inline.
>
>>
>>Thanks,
>>Jiayu
>>
>>On Fri, Sep 04, 2020 at 04:37:39PM +0800, yang_y_yi@163.com wrote:
>>> From: Yi Yang <yangyi01@inspur.com>
>>> 
>>> UDP GRO can help improve VM-to-VM UDP performance when
>>> VM is enabled UFO or GSO, GRO must be supported if GSO
>>> or UFO is enabled, otherwise, performance gain will be
>>> hurt.
>>> 
>>> With this enabled in DPDK, OVS DPDK can leverage it
>>> to improve VM-to-VM UDP performance, this will make
>>> sure IP fragments will be reassembled once it is
>>> received from physical NIC. It is very helpful in OVS
>>> DPDK VLAN TSO case.
>>> 
>>> Signed-off-by: Yi Yang <yangyi01@inspur.com>
>>> ---
>>>  lib/librte_gro/Makefile    |   1 +
>>>  lib/librte_gro/gro_udp4.c  | 430 +++++++++++++++++++++++++++++++++++++++++++++
>>>  lib/librte_gro/gro_udp4.h  | 281 +++++++++++++++++++++++++++++
>>>  lib/librte_gro/meson.build |   2 +-
>>>  lib/librte_gro/rte_gro.c   |  93 ++++++++--
>>>  lib/librte_gro/rte_gro.h   |   5 +-
>>>  6 files changed, 796 insertions(+), 16 deletions(-)
>>>  create mode 100644 lib/librte_gro/gro_udp4.c
>>>  create mode 100644 lib/librte_gro/gro_udp4.h
>>> 
>>> diff --git a/lib/librte_gro/Makefile b/lib/librte_gro/Makefile
>>> index e848687..41ec29e 100644
>>> --- a/lib/librte_gro/Makefile
>>> +++ b/lib/librte_gro/Makefile
>>> @@ -15,6 +15,7 @@ EXPORT_MAP := rte_gro_version.map
>>>  # source files
>>>  SRCS-$(CONFIG_RTE_LIBRTE_GRO) += rte_gro.c
>>>  SRCS-$(CONFIG_RTE_LIBRTE_GRO) += gro_tcp4.c
>>> +SRCS-$(CONFIG_RTE_LIBRTE_GRO) += gro_udp4.c
>>>  SRCS-$(CONFIG_RTE_LIBRTE_GRO) += gro_vxlan_tcp4.c
>>>  
>>>  # install this header file
>>> diff --git a/lib/librte_gro/gro_udp4.c b/lib/librte_gro/gro_udp4.c
>>> new file mode 100644
>>> index 0000000..25584fd
>>> --- /dev/null
>>> +++ b/lib/librte_gro/gro_udp4.c
>>> @@ -0,0 +1,430 @@
>>> +/* SPDX-License-Identifier: BSD-3-Clause
>>> + * Copyright(c) 2020 Inspur Corporation
>>> + */
>>> +
>>> +#include <rte_malloc.h>
>>> +#include <rte_mbuf.h>
>>> +#include <rte_cycles.h>
>>> +#include <rte_ethdev.h>
>>> +
>>> +#include "gro_udp4.h"
>>> +
>>> +void *
>>> +gro_udp4_tbl_create(uint16_t socket_id,
>>> +		uint16_t max_flow_num,
>>> +		uint16_t max_item_per_flow)
>>> +{
>>> +	struct gro_udp4_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_UDP4_TBL_MAX_ITEM_NUM);
>>> +
>>> +	if (entries_num == 0)
>>> +		return NULL;
>>> +
>>> +	tbl = rte_zmalloc_socket(__func__,
>>> +			sizeof(struct gro_udp4_tbl),
>>> +			RTE_CACHE_LINE_SIZE,
>>> +			socket_id);
>>> +	if (tbl == NULL)
>>> +		return NULL;
>>> +
>>> +	size = sizeof(struct gro_udp4_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_udp4_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_udp4_tbl_destroy(void *tbl)
>>> +{
>>> +	struct gro_udp4_tbl *udp_tbl = tbl;
>>> +
>>> +	if (udp_tbl) {
>>> +		rte_free(udp_tbl->items);
>>> +		rte_free(udp_tbl->flows);
>>> +	}
>>> +	rte_free(udp_tbl);
>>> +}
>>> +
>>> +static inline uint32_t
>>> +find_an_empty_item(struct gro_udp4_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_udp4_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_udp4_tbl *tbl,
>>> +		struct rte_mbuf *pkt,
>>> +		uint64_t start_time,
>>> +		uint32_t prev_idx,
>>> +		uint16_t frag_offset,
>>> +		uint8_t is_last_frag)
>>> +{
>>> +	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].frag_offset = frag_offset;
>>> +	tbl->items[item_idx].is_last_frag = is_last_frag;
>>> +	tbl->items[item_idx].nb_merged = 1;
>>> +	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_udp4_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_udp4_tbl *tbl,
>>> +		struct udp4_flow_key *src,
>>> +		uint32_t item_idx)
>>> +{
>>> +	struct udp4_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));
>>> +	dst->ip_src_addr = src->ip_src_addr;
>>> +	dst->ip_dst_addr = src->ip_dst_addr;
>>> +	dst->ip_id = src->ip_id;
>>> +	dst->ip_id = src->ip_id;
>>
>>Duplicated code.
>
>Thanks, good catch, will remove it.
>
>>
>>> +
>>> +	tbl->flows[flow_idx].start_index = item_idx;
>>> +	tbl->flow_num++;
>>> +
>>> +	return flow_idx;
>>> +}
>>> +
>>> +/*
>>> + * update the packet length for the flushed packet.
>>> + */
>>> +static inline void
>>> +update_header(struct gro_udp4_item *item)
>>> +{
>>> +	struct rte_ipv4_hdr *ipv4_hdr;
>>> +	struct rte_mbuf *pkt = item->firstseg;
>>> +	uint16_t frag_offset;
>>> +
>>> +	ipv4_hdr = (struct rte_ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
>>> +			pkt->l2_len);
>>> +	ipv4_hdr->total_length = rte_cpu_to_be_16(pkt->pkt_len -
>>> +			pkt->l2_len);
>>> +
>>> +	/* Clear MF bit if it is last fragment */
>>> +	if (item->is_last_frag) {
>>> +		frag_offset = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
>>> +		ipv4_hdr->fragment_offset =
>>> +			rte_cpu_to_be_16(frag_offset & ~RTE_IPV4_HDR_MF_FLAG);
>>> +	}
>>> +}
>>> +
>>> +int32_t
>>> +gro_udp4_reassemble(struct rte_mbuf *pkt,
>>> +		struct gro_udp4_tbl *tbl,
>>> +		uint64_t start_time)
>>> +{
>>> +	struct rte_ether_hdr *eth_hdr;
>>> +	struct rte_ipv4_hdr *ipv4_hdr;
>>> +	uint16_t ip_dl;
>>> +	uint16_t ip_id, hdr_len;
>>> +	uint16_t frag_offset = 0;
>>> +	uint8_t is_last_frag;
>>> +
>>> +	struct udp4_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;
>>> +
>>> +	eth_hdr = rte_pktmbuf_mtod(pkt, struct rte_ether_hdr *);
>>> +	ipv4_hdr = (struct rte_ipv4_hdr *)((char *)eth_hdr + pkt->l2_len);
>>> +	hdr_len = pkt->l2_len + pkt->l3_len;
>>> +
>>> +	/*
>>> +	 * Don't process non-fragment packet.
>>> +	 */
>>> +	if (!is_ipv4_fragment(ipv4_hdr))
>>> +		return -1;
>>> +
>>> +	/*
>>> +	 * Don't process the packet whose payload length is less than or
>>> +	 * equal to 0.
>>> +	 */
>>> +	if (pkt->pkt_len - hdr_len <= 0)
>>> +		return -1;
>>
>>If input packets are malicious, whose mbuf->pkt_len is smaller than
>>(mbuf->l2_len+mbuf->l3_len), the above check wotn't work correctly,
>>as its value is uint16_t, which is always positive.
>
>I tried the below code.
>
>$ cat a.c
>#include 
>#include 
>
>int main()
>{
>    uint16_t a = 10;
>    uint16_t b = 8;
>
>    if ((b - a) < 0) {
>        printf("%u < %u\n", b , a);
>    }
>}
>$ gcc a.c
>$ ./a.out
>8 < 10
>$
>
>It works, so I think it is ok, nervertheless, I'll change it to the below to avoid your concern.
>
>if (pkt->pkt_len <= hdr_len)
>
>>
>>> +
>>> +	ip_dl = rte_be_to_cpu_16(ipv4_hdr->total_length) - pkt->l3_len;
>>
>>Same as above.
>
>I think "if (pkt->pkt_len <= hdr_len)" can ensure ip_dl will be positive, I can add one more
>condition check here if you want
>
>if (rte_be_to_cpu_16(ipv4_hdr->total_length) <= l3_len)
>        return -1;
>
>But I think it is unnecessary here for a little bit performance as you're caring.
>
>>
>>> +	ip_id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
>>> +	frag_offset = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
>>> +	is_last_frag = ((frag_offset & RTE_IPV4_HDR_MF_FLAG) == 0) ? 1 : 0;
>>> +	frag_offset = (uint16_t)(frag_offset & RTE_IPV4_HDR_OFFSET_MASK) << 3;
>>> +
>>> +	rte_ether_addr_copy(&(eth_hdr->s_addr), &(key.eth_saddr));
>>> +	rte_ether_addr_copy(&(eth_hdr->d_addr), &(key.eth_daddr));
>>> +	key.ip_src_addr = ipv4_hdr->src_addr;
>>> +	key.ip_dst_addr = ipv4_hdr->dst_addr;
>>> +	key.ip_id = ip_id;
>>> +
>>> +	/* 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_udp4_flow(tbl->flows[i].key, key)) {
>>> +				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, frag_offset,
>>> +				is_last_frag);
>>> +		if (item_idx == INVALID_ARRAY_INDEX)
>>> +			return -1;
>>
>>Adding unlikely here could get better performance, IMO.
>
>No problem.
>
>>
>>> +		if (insert_new_flow(tbl, &key, 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 = udp_check_neighbor(&(tbl->items[cur_idx]),
>>> +				frag_offset, ip_dl, 0);
>>> +		if (cmp) {
>>> +			if (merge_two_udp4_packets(&(tbl->items[cur_idx]),
>>> +						pkt, cmp, frag_offset,
>>> +						is_last_frag, 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, prev_idx,
>>> +						frag_offset, is_last_frag) ==
>>> +					INVALID_ARRAY_INDEX)
>>> +				return -1;
>>> +			return 0;
>>> +		}
>>> +
>>> +		/* Ensure inserted items are ordered by frag_offset */
>>> +		if (frag_offset
>>> +			< tbl->items[cur_idx].frag_offset) {
>>> +			break;
>>> +		}
>>> +
>>> +		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 (cur_idx == tbl->flows[i].start_index) {
>>> +		/* Insert it before the first packet of the flow */
>>> +		item_idx = insert_new_item(tbl, pkt, start_time,
>>> +				INVALID_ARRAY_INDEX, frag_offset,
>>> +				is_last_frag);
>>> +		if (item_idx == INVALID_ARRAY_INDEX)
>>> +			return -1;
>>> +		tbl->items[item_idx].next_pkt_idx = cur_idx;
>>> +		tbl->flows[i].start_index = item_idx;
>>> +	} else {
>>> +		if (insert_new_item(tbl, pkt, start_time, prev_idx,
>>> +				frag_offset, is_last_frag)
>>> +			== INVALID_ARRAY_INDEX)
>>> +			return -1;
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int
>>> +gro_udp4_merge_items(struct gro_udp4_tbl *tbl,
>>> +			   uint32_t start_idx)
>>> +{
>>> +	uint16_t frag_offset;
>>> +	uint8_t is_last_frag;
>>> +	int16_t ip_dl;
>>> +	struct rte_mbuf *pkt;
>>> +	int cmp;
>>> +	uint32_t item_idx;
>>> +	uint16_t hdr_len;
>>> +
>>> +	item_idx = tbl->items[start_idx].next_pkt_idx;
>>> +	while (item_idx != INVALID_ARRAY_INDEX) {
>>> +		pkt = tbl->items[item_idx].firstseg;
>>> +		hdr_len = pkt->outer_l2_len + pkt->outer_l3_len + pkt->l2_len +
>>> +			pkt->l3_len;
>>
>>For non-tunnel packets, mbuf->outer_l3/l2_len are not guaranteed 0.
>>I think it's better to pass outer header length as a parameter of
>>gro_udp4_merge_item(), like udp_check_neighbor().
>
>For udp GRO, we can remove outer_l3/l2_len, they are nonsense.
>
>>
>>> +		ip_dl = pkt->pkt_len - hdr_len;
>>> +		frag_offset = tbl->items[item_idx].frag_offset;
>>> +		is_last_frag = tbl->items[item_idx].is_last_frag;
>>> +		cmp = udp_check_neighbor(&(tbl->items[start_idx]),
>>> +					frag_offset, ip_dl, 0);
>>> +		if (cmp) {
>>> +			if (merge_two_udp4_packets(
>>> +					&(tbl->items[start_idx]),
>>> +					pkt, cmp, frag_offset,
>>> +					is_last_frag, 0)) {
>>> +				item_idx = delete_item(tbl, item_idx,
>>> +							INVALID_ARRAY_INDEX);
>>> +				tbl->items[start_idx].next_pkt_idx
>>> +					= item_idx;
>>> +			} else {
>>> +				return 0;
>>> +			}
>>> +		} else {
>>> +			return 0;
>>> +		}
>>
>>A single line doesn't need braces.
>
>Got it, will remove { }
>
>>
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +uint16_t
>>> +gro_udp4_tbl_timeout_flush(struct gro_udp4_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) {
>>> +				gro_udp4_merge_items(tbl, j);
>>> +				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_udp4_tbl_pkt_count(void *tbl)
>>> +{
>>> +	struct gro_udp4_tbl *gro_tbl = tbl;
>>> +
>>> +	if (gro_tbl)
>>> +		return gro_tbl->item_num;
>>> +
>>> +	return 0;
>>> +}
>>> diff --git a/lib/librte_gro/gro_udp4.h b/lib/librte_gro/gro_udp4.h
>>> new file mode 100644
>>> index 0000000..bc67eb1
>>> --- /dev/null
>>> +++ b/lib/librte_gro/gro_udp4.h
>>> @@ -0,0 +1,281 @@
>>> +/* SPDX-License-Identifier: BSD-3-Clause
>>> + * Copyright(c) 2020 Inspur Corporation
>>> + */
>>> +
>>> +#ifndef _GRO_UDP4_H_
>>> +#define _GRO_UDP4_H_
>>> +
>>> +#include <rte_ip.h>
>>> +#include <rte_udp.h>
>>> +
>>> +#define INVALID_ARRAY_INDEX 0xffffffffUL
>>> +#define GRO_UDP4_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
>>> +
>>> +/* Header fields representing a UDP/IPv4 flow */
>>> +struct udp4_flow_key {
>>> +	struct rte_ether_addr eth_saddr;
>>> +	struct rte_ether_addr eth_daddr;
>>> +	uint32_t ip_src_addr;
>>> +	uint32_t ip_dst_addr;
>>> +
>>> +	/* IP fragment for UDP does not contain UDP header
>>> +	 * except the first one. But IP ID must be same.
>>> +	 */
>>> +	uint16_t ip_id;
>>> +};
>>> +
>>> +struct gro_udp4_flow {
>>> +	struct udp4_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_udp4_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;
>>> +	/* offset of IP fragment packet */
>>> +	uint16_t frag_offset;
>>> +	/* is last IP fragment? */
>>> +	uint8_t is_last_frag;
>>> +	/* the number of merged packets */
>>> +	uint16_t nb_merged;
>>> +};
>>> +
>>> +/*
>>> + * UDP/IPv4 reassembly table structure.
>>> + */
>>> +struct gro_udp4_tbl {
>>> +	/* item array */
>>> +	struct gro_udp4_item *items;
>>> +	/* flow array */
>>> +	struct gro_udp4_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 UDP/IPv4 reassembly table.
>>> + *
>>> + * @param socket_id
>>> + *  Socket index for allocating the UDP/IPv4 reassemble table
>>> + * @param max_flow_num
>>> + *  The maximum number of flows in the UDP/IPv4 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_udp4_tbl_create(uint16_t socket_id,
>>> +		uint16_t max_flow_num,
>>> +		uint16_t max_item_per_flow);
>>> +
>>> +/**
>>> + * This function destroys a UDP/IPv4 reassembly table.
>>> + *
>>> + * @param tbl
>>> + *  Pointer pointing to the UDP/IPv4 reassembly table.
>>> + */
>>> +void gro_udp4_tbl_destroy(void *tbl);
>>> +
>>> +/**
>>> + * This function merges a UDP/IPv4 packet.
>>> + *
>>> + * This function does not check if the packet has correct checksums and
>>> + * does not re-calculate checksums for the merged packet. It returns the
>>> + * packet if it isn't UDP fragment or there is no available space in
>>> + * the table.
>>> + *
>>> + * @param pkt
>>> + *  Packet to reassemble
>>> + * @param tbl
>>> + *  Pointer pointing to the UDP/IPv4 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_udp4_reassemble(struct rte_mbuf *pkt,
>>> +		struct gro_udp4_tbl *tbl,
>>> +		uint64_t start_time);
>>> +
>>> +/**
>>> + * This function flushes timeout packets in a UDP/IPv4 reassembly table,
>>> + * and without updating checksums.
>>> + *
>>> + * @param tbl
>>> + *  UDP/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_udp4_tbl_timeout_flush(struct gro_udp4_tbl *tbl,
>>> +		uint64_t flush_timestamp,
>>> +		struct rte_mbuf **out,
>>> +		uint16_t nb_out);
>>> +
>>> +/**
>>> + * This function returns the number of the packets in a UDP/IPv4
>>> + * reassembly table.
>>> + *
>>> + * @param tbl
>>> + *  UDP/IPv4 reassembly table pointer
>>> + *
>>> + * @return
>>> + *  The number of packets in the table
>>> + */
>>> +uint32_t gro_udp4_tbl_pkt_count(void *tbl);
>>> +
>>> +/*
>>> + * Check if two UDP/IPv4 packets belong to the same flow.
>>> + */
>>> +static inline int
>>> +is_same_udp4_flow(struct udp4_flow_key k1, struct udp4_flow_key k2)
>>> +{
>>> +	return (rte_is_same_ether_addr(&k1.eth_saddr, &k2.eth_saddr) &&
>>> +			rte_is_same_ether_addr(&k1.eth_daddr, &k2.eth_daddr) &&
>>> +			(k1.ip_src_addr == k2.ip_src_addr) &&
>>> +			(k1.ip_dst_addr == k2.ip_dst_addr) &&
>>> +			(k1.ip_id == k2.ip_id));
>>> +}
>>> +
>>> +/*
>>> + * Merge two UDP/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_udp4_packets(struct gro_udp4_item *item,
>>> +		struct rte_mbuf *pkt,
>>> +		int cmp,
>>> +		uint16_t frag_offset,
>>> +		uint8_t is_last_frag,
>>> +		uint16_t l2_offset)
>>> +{
>>> +	struct rte_mbuf *pkt_head, *pkt_tail, *lastseg;
>>> +	uint16_t hdr_len, l2_len;
>>> +	uint32_t ip_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;
>>> +	l2_len = l2_offset > 0 ? pkt_head->outer_l2_len : pkt_head->l2_len;
>>> +	ip_len = pkt_head->pkt_len - l2_len
>>> +		 + pkt_tail->pkt_len - hdr_len;
>>> +	if (unlikely(ip_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);
>>> +	} else {
>>> +		lastseg = rte_pktmbuf_lastseg(pkt);
>>> +		lastseg->next = item->firstseg;
>>> +		item->firstseg = pkt;
>>> +		item->frag_offset = frag_offset;
>>> +	}
>>> +	item->nb_merged++;
>>> +	if (is_last_frag)
>>> +		item->is_last_frag = is_last_frag;
>>> +
>>> +	/* 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 UDP/IPv4 packets are neighbors.
>>> + */
>>> +static inline int
>>> +udp_check_neighbor(struct gro_udp4_item *item,
>>> +		uint16_t frag_offset,
>>> +		uint16_t ip_dl,
>>> +		uint16_t l2_offset)
>>
>>It's better to rename the function as udp4_check_neighbor(), IMO.
>
>No problem
>
>>
>>> +{
>>> +	struct rte_mbuf *pkt_orig = item->firstseg;
>>> +	uint16_t len;
>>> +
>>> +	/* check if the two packets are neighbors */
>>> +	len = pkt_orig->pkt_len - l2_offset - pkt_orig->l2_len -
>>> +		pkt_orig->l3_len;
>>> +	if (frag_offset == item->frag_offset + len)
>>> +		/* append the new packet */
>>> +		return 1;
>>> +	else if (frag_offset + ip_dl == item->frag_offset)
>>> +		/* pre-pend the new packet */
>>> +		return -1;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static inline int
>>> +is_ipv4_fragment(const struct rte_ipv4_hdr *hdr)
>>> +{
>>> +	uint16_t flag_offset, ip_flag, ip_ofs;
>>> +
>>> +	flag_offset = rte_be_to_cpu_16(hdr->fragment_offset);
>>> +	ip_ofs = (uint16_t)(flag_offset & RTE_IPV4_HDR_OFFSET_MASK);
>>> +	ip_flag = (uint16_t)(flag_offset & RTE_IPV4_HDR_MF_FLAG);
>>> +
>>> +	return ip_flag != 0 || ip_ofs  != 0;
>>> +}
>>> +#endif
>>> diff --git a/lib/librte_gro/meson.build b/lib/librte_gro/meson.build
>>> index 501668c..0d18dc2 100644
>>> --- a/lib/librte_gro/meson.build
>>> +++ b/lib/librte_gro/meson.build
>>> @@ -1,6 +1,6 @@
>>>  # SPDX-License-Identifier: BSD-3-Clause
>>>  # Copyright(c) 2017 Intel Corporation
>>>  
>>> -sources = files('rte_gro.c', 'gro_tcp4.c', 'gro_vxlan_tcp4.c')
>>> +sources = files('rte_gro.c', 'gro_tcp4.c', 'gro_udp4.c', 'gro_vxlan_tcp4.c')
>>>  headers = files('rte_gro.h')
>>>  deps += ['ethdev']
>>> diff --git a/lib/librte_gro/rte_gro.c b/lib/librte_gro/rte_gro.c
>>> index 6618f4d..d094129 100644
>>> --- a/lib/librte_gro/rte_gro.c
>>> +++ b/lib/librte_gro/rte_gro.c
>>> @@ -9,6 +9,7 @@
>>>  
>>>  #include "rte_gro.h"
>>>  #include "gro_tcp4.h"
>>> +#include "gro_udp4.h"
>>>  #include "gro_vxlan_tcp4.h"
>>>  
>>>  typedef void *(*gro_tbl_create_fn)(uint16_t socket_id,
>>> @@ -18,17 +19,23 @@
>>>  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, NULL};
>>> +		gro_tcp4_tbl_create, gro_vxlan_tcp4_tbl_create,
>>> +		gro_udp4_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,
>>>  			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,
>>>  			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_UDP_PKT(ptype) (RTE_ETH_IS_IPV4_HDR(ptype) && \
>>> +		((ptype & RTE_PTYPE_L4_UDP) == RTE_PTYPE_L4_UDP))
>>> +
>>>  #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) == \
>>> @@ -40,6 +47,7 @@
>>>  		     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
>>> @@ -123,20 +131,26 @@ struct gro_ctx {
>>>  	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 */
>>> +	/* allocate a reassembly table for UDP/IPv4 GRO */
>>> +	struct gro_udp4_tbl udp_tbl;
>>> +	struct gro_udp4_flow udp_flows[RTE_GRO_MAX_BURST_ITEM_NUM];
>>> +	struct gro_udp4_item udp_items[RTE_GRO_MAX_BURST_ITEM_NUM] = {{0} };
>>> +
>>> +	/* Allocate a reassembly table for VXLAN TCP 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 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;
>>> +	uint8_t do_tcp4_gro = 0, do_vxlan_gro = 0, do_udp4_gro = 0;
>>>  
>>>  	if (unlikely((param->gro_types & (RTE_GRO_IPV4_VXLAN_TCP_IPV4 |
>>> -					RTE_GRO_TCP_IPV4)) == 0))
>>> +					RTE_GRO_TCP_IPV4 |
>>> +					RTE_GRO_UDP_IPV4)) == 0))
>>>  		return nb_pkts;
>>>  
>>>  	/* Get the maximum number of packets */
>>> @@ -170,6 +184,20 @@ struct gro_ctx {
>>>  		do_tcp4_gro = 1;
>>>  	}
>>>  
>>> +	if (param->gro_types & RTE_GRO_UDP_IPV4) {
>>> +		for (i = 0; i < item_num; i++)
>>> +			udp_flows[i].start_index = INVALID_ARRAY_INDEX;
>>> +
>>> +		udp_tbl.flows = udp_flows;
>>> +		udp_tbl.items = udp_items;
>>> +		udp_tbl.flow_num = 0;
>>> +		udp_tbl.item_num = 0;
>>> +		udp_tbl.max_flow_num = item_num;
>>> +		udp_tbl.max_item_num = item_num;
>>> +		do_udp4_gro = 1;
>>> +	}
>>> +
>>> +
>>>  	for (i = 0; i < nb_pkts; i++) {
>>>  		/*
>>>  		 * The timestamp is ignored, since all packets
>>> @@ -177,7 +205,8 @@ struct gro_ctx {
>>>  		 */
>>>  		if (IS_IPV4_VXLAN_TCP4_PKT(pkts[i]->packet_type) &&
>>>  				do_vxlan_gro) {
>>> -			ret = gro_vxlan_tcp4_reassemble(pkts[i], &vxlan_tbl, 0);
>>> +			ret = gro_vxlan_tcp4_reassemble(pkts[i],
>>> +							&vxlan_tbl, 0);
>>>  			if (ret > 0)
>>>  				/* Merge successfully */
>>>  				nb_after_gro--;
>>> @@ -191,27 +220,43 @@ struct gro_ctx {
>>>  				nb_after_gro--;
>>>  			else if (ret < 0)
>>>  				unprocess_pkts[unprocess_num++] = pkts[i];
>>> +		} else if (IS_IPV4_UDP_PKT(pkts[i]->packet_type) &&
>>> +				do_udp4_gro) {
>>> +			ret = gro_udp4_reassemble(pkts[i], &udp_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];
>>>  	}
>>>  
>>> -	if (nb_after_gro < nb_pkts) {
>>> +	if ((nb_after_gro < nb_pkts)
>>> +		 || (unprocess_num < nb_pkts)) {
>>
>>Why need to check unprocess_num here?
>
>In the case that packet isn't merged, nb_after_gro won't be changed, we only can use unprocess_num to check, it is possible to reassmble them successfully in flush phase.
>
>>
>>>  		i = 0;
>>>  		/* Flush all packets from the tables */
>>>  		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);
>>>  		}
>>> +
>>> +		if (do_udp4_gro) {
>>> +			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);
>>>  		}
>>> +		nb_after_gro = i + unprocess_num;
>>>  	}
>>>  
>>>  	return nb_after_gro;
>>> 1.8.3.1
>
>