Re: [PATCH v9] gro : ipv6 changes to support GRO for TCP/ipv6

[kumaraparameshwaran rathinavel <kumaraparamesh92@gmail.com>]

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On Thu, Jun 15, 2023 at 11:50 AM Kumara Parameshwaran <
kumaraparamesh92@gmail.com> wrote:

> 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.
> v2:
>         * Fix comments in gro_tcp6.h header file.
>
> v3:
>         * Adderess review comments to fix code duplication for v4 and v6
>
> v4:
>         * Addresses review comments for v3, do not use callbacks
>
> v5:
>         * Address review comments
>
> v6:
>         * Fix warning and coding style issues
>
> v7:
>         * Fix build compilation issue
>
> v8:
>         * Use gro_tcp_internal.h for functions used for gro_tcp4 and
> gro_tcp6 and use
>           gro_tcp.h for data structures and functions used across
> gro_vxlan_tcp4
>
> v9:
>         * Resolve merge conflict and add gro_tcp.h in proper path
>
>  .../generic_receive_offload_lib.rst           |  21 +-
>  doc/guides/rel_notes/release_23_07.rst        |   2 +
>  lib/gro/gro_tcp.h                             | 187 ++++++++++++
>  lib/gro/gro_tcp4.c                            | 177 +++---------
>  lib/gro/gro_tcp4.h                            | 170 +----------
>  lib/gro/gro_tcp6.c                            | 268 ++++++++++++++++++
>  lib/gro/gro_tcp6.h                            | 160 +++++++++++
>  lib/gro/gro_tcp_internal.h                    | 128 +++++++++
>  lib/gro/gro_vxlan_tcp4.c                      |  22 +-
>  lib/gro/gro_vxlan_tcp4.h                      |   2 +-
>  lib/gro/meson.build                           |   1 +
>  lib/gro/rte_gro.c                             |  83 +++++-
>  lib/gro/rte_gro.h                             |   3 +
>  13 files changed, 883 insertions(+), 341 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
>  create mode 100644 lib/gro/gro_tcp_internal.h
>
> diff --git a/doc/guides/prog_guide/generic_receive_offload_lib.rst
> b/doc/guides/prog_guide/generic_receive_offload_lib.rst
> index 98a5d29bbc..533cda7f5c 100644
> --- a/doc/guides/prog_guide/generic_receive_offload_lib.rst
> +++ b/doc/guides/prog_guide/generic_receive_offload_lib.rst
> @@ -138,20 +138,21 @@ The key-based algorithm has two characters:
>
>     Key-based Reassembly Algorithm
>
> -TCP/IPv4 GRO
> -------------
> +TCP-IPv4/IPv6 GRO
> +-----------------
>
> -The table structure used by TCP/IPv4 GRO contains two arrays: flow array
> +The table structure used by TCP-IPv4/IPv6 GRO contains two arrays: flow
> array
>  and item array. The flow array keeps flow information, and the item array
> -keeps packet information.
> +keeps packet information. The flow array is different for IPv4 and IPv6
> while
> +the item array is the same.
>
> -Header fields used to define a TCP/IPv4 flow include:
> +Header fields used to define a TCP-IPv4/IPv6 flow include:
>
> -- source and destination: Ethernet and IP address, TCP port
> +- common tcp key fields : Ethernet address, TCP port, TCP acknowledge
> number
> +- version specific IP address
> +- IPv6 flow label for IPv6 flow
>
> -- TCP acknowledge number
> -
> -TCP/IPv4 packets whose FIN, SYN, RST, URG, PSH, ECE or CWR bit is set
> +TCP packets whose FIN, SYN, RST, URG, PSH, ECE or CWR bit is set
>  won't be processed.
>
>  Header fields deciding if two packets are neighbors include:
> @@ -159,7 +160,7 @@ Header fields deciding if two packets are neighbors
> include:
>  - TCP sequence number
>
>  - IPv4 ID. The IPv4 ID fields of the packets, whose DF bit is 0, should
> -  be increased by 1.
> +  be increased by 1. This is applicable only for IPv4
>
>  VxLAN GRO
>  ---------
> diff --git a/doc/guides/rel_notes/release_23_07.rst
> b/doc/guides/rel_notes/release_23_07.rst
> index 027ae7bd2d..7124cf45c7 100644
> --- a/doc/guides/rel_notes/release_23_07.rst
> +++ b/doc/guides/rel_notes/release_23_07.rst
> @@ -170,6 +170,8 @@ New Features
>
>    See :doc:`../prog_guide/pdcp_lib` for more information.
>
> +* **Added support for TCP/IPv6 GRO.**
> +  * Enhanced the existing library to support GRO for TCP packets over
> IPv6 network.
>
>  Removed Items
>  -------------
> diff --git a/lib/gro/gro_tcp.h b/lib/gro/gro_tcp.h
> new file mode 100644
> index 0000000000..7c7a6a3008
> --- /dev/null
> +++ b/lib/gro/gro_tcp.h
> @@ -0,0 +1,187 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2023 Intel Corporation
> + */
> +#ifndef _GRO_TCP_H_
> +#define _GRO_TCP_H_
> +
> +#define INVALID_ARRAY_INDEX 0xffffffffUL
> +
> +#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 cmn_tcp_key {
> +       struct rte_ether_addr eth_saddr;
> +       struct rte_ether_addr eth_daddr;
> +       uint32_t recv_ack;
> +       uint16_t src_port;
> +       uint16_t dst_port;
> +};
> +
> +#define ASSIGN_COMMON_TCP_KEY(k1, k2) \
> +       do {\
> +               rte_ether_addr_copy(&(k1->eth_saddr), &(k2->eth_saddr)); \
> +               rte_ether_addr_copy(&(k1->eth_daddr), &(k2->eth_daddr)); \
> +               k2->recv_ack = k1->recv_ack; \
> +               k2->src_port = k1->src_port; \
> +               k2->dst_port = k1->dst_port; \
> +       } while (0)
> +
> +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;
> +       union {
> +               /* IPv4 ID of the packet */
> +               uint16_t ip_id;
> +               /* Unused field for IPv6 */
> +               uint16_t unused;
> +       } l3;
> +       /* 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->l3.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->l3.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 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->l3.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->l3.ip_id)))
> +               /* pre-pend the new packet */
> +               return -1;
> +
> +       return 0;
> +}
> +
> +static inline int
> +is_same_common_tcp_key(struct cmn_tcp_key *k1, struct cmn_tcp_key *k2)
> +{
> +       return (!memcmp(k1, k2, sizeof(struct cmn_tcp_key)));
> +}
> +
> +#endif
> diff --git a/lib/gro/gro_tcp4.c b/lib/gro/gro_tcp4.c
> index 0014096e63..6645de592b 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_internal.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,
> @@ -71,18 +72,6 @@ gro_tcp4_tbl_destroy(void *tbl)
>         rte_free(tcp_tbl);
>  }
>
> -static inline uint32_t
> -find_an_empty_item(struct gro_tcp4_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_tcp4_tbl *tbl)
>  {
> @@ -95,56 +84,6 @@ find_an_empty_flow(struct gro_tcp4_tbl *tbl)
>         return INVALID_ARRAY_INDEX;
>  }
>
> -static inline uint32_t
> -insert_new_item(struct gro_tcp4_tbl *tbl,
> -               struct rte_mbuf *pkt,
> -               uint64_t start_time,
> -               uint32_t prev_idx,
> -               uint32_t sent_seq,
> -               uint16_t ip_id,
> -               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].ip_id = ip_id;
> -       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_tcp4_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_tcp4_tbl *tbl,
>                 struct tcp4_flow_key *src,
> @@ -159,13 +98,10 @@ insert_new_flow(struct gro_tcp4_tbl *tbl,
>
>         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));
> +       ASSIGN_COMMON_TCP_KEY((&src->cmn_key), (&dst->cmn_key));
> +
>         dst->ip_src_addr = src->ip_src_addr;
>         dst->ip_dst_addr = src->ip_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++;
> @@ -173,21 +109,6 @@ insert_new_flow(struct gro_tcp4_tbl *tbl,
>         return flow_idx;
>  }
>
> -/*
> - * update the packet length for the flushed packet.
> - */
> -static inline void
> -update_header(struct gro_tcp4_item *item)
> -{
> -       struct rte_ipv4_hdr *ipv4_hdr;
> -       struct rte_mbuf *pkt = item->firstseg;
> -
> -       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);
> -}
> -
>  int32_t
>  gro_tcp4_reassemble(struct rte_mbuf *pkt,
>                 struct gro_tcp4_tbl *tbl,
> @@ -202,9 +123,8 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt,
>         uint8_t is_atomic;
>
>         struct tcp4_flow_key key;
> -       uint32_t cur_idx, prev_idx, item_idx;
> +       uint32_t item_idx;
>         uint32_t i, max_flow_num, remaining_flow_num;
> -       int cmp;
>         uint8_t find;
>
>         /*
> @@ -239,6 +159,14 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt,
>         if (tcp_dl <= 0)
>                 return -1;
>
> +       rte_ether_addr_copy(&(eth_hdr->src_addr),
> &(key.cmn_key.eth_saddr));
> +       rte_ether_addr_copy(&(eth_hdr->dst_addr),
> &(key.cmn_key.eth_daddr));
> +       key.ip_src_addr = ipv4_hdr->src_addr;
> +       key.ip_dst_addr = ipv4_hdr->dst_addr;
> +       key.cmn_key.src_port = tcp_hdr->src_port;
> +       key.cmn_key.dst_port = tcp_hdr->dst_port;
> +       key.cmn_key.recv_ack = tcp_hdr->recv_ack;
> +
>         /*
>          * Save IPv4 ID for the packet whose DF bit is 0. For the packet
>          * whose DF bit is 1, IPv4 ID is ignored.
> @@ -246,15 +174,6 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt,
>         frag_off = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
>         is_atomic = (frag_off & RTE_IPV4_HDR_DF_FLAG) ==
> RTE_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);
> -
> -       rte_ether_addr_copy(&(eth_hdr->src_addr), &(key.eth_saddr));
> -       rte_ether_addr_copy(&(eth_hdr->dst_addr), &(key.eth_daddr));
> -       key.ip_src_addr = ipv4_hdr->src_addr;
> -       key.ip_dst_addr = ipv4_hdr->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;
> @@ -270,63 +189,44 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt,
>                 }
>         }
>
> -       /*
> -        * 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, ip_id,
> -                               is_atomic);
> +               sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
> +               item_idx = insert_new_tcp_item(pkt, tbl->items,
> &tbl->item_num,
> +                                               tbl->max_item_num,
> start_time,
> +                                               INVALID_ARRAY_INDEX,
> sent_seq, ip_id,
> +                                               is_atomic);
>                 if (item_idx == INVALID_ARRAY_INDEX)
>                         return -1;
>                 if (insert_new_flow(tbl, &key, item_idx) ==
> -                               INVALID_ARRAY_INDEX) {
> +                       INVALID_ARRAY_INDEX) {
>                         /*
>                          * Fail to insert a new flow, so delete the
>                          * stored packet.
> -                        */
> -                       delete_item(tbl, item_idx, INVALID_ARRAY_INDEX);
> +                       */
> +                       delete_tcp_item(tbl->items, item_idx,
> &tbl->item_num, 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, ip_id, pkt->l4_len, tcp_dl, 0,
> -                               is_atomic);
> -               if (cmp) {
> -                       if (merge_two_tcp4_packets(&(tbl->items[cur_idx]),
> -                                               pkt, cmp, sent_seq, ip_id,
> 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, ip_id,
> is_atomic) ==
> -                                       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);
> +       return process_tcp_item(pkt, tcp_hdr, tcp_dl, tbl->items,
> tbl->flows[i].start_index,
> +                                               &tbl->item_num,
> tbl->max_item_num,
> +                                               ip_id, is_atomic,
> start_time);
> +}
>
> -       /* Fail to find a neighbor, so store the packet into the flow. */
> -       if (insert_new_item(tbl, pkt, start_time, prev_idx, sent_seq,
> -                               ip_id, is_atomic) == INVALID_ARRAY_INDEX)
> -               return -1;
> +/*
> + * update the packet length for the flushed packet.
> + */
> +static inline void
> +update_header(struct gro_tcp_item *item)
> +{
> +       struct rte_ipv4_hdr *ipv4_hdr;
> +       struct rte_mbuf *pkt = item->firstseg;
>
> -       return 0;
> +       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);
>  }
>
>  uint16_t
> @@ -353,7 +253,8 @@ gro_tcp4_tbl_timeout_flush(struct gro_tcp4_tbl *tbl,
>                                  * Delete the packet and get the next
>                                  * packet in the flow.
>                                  */
> -                               j = delete_item(tbl, j,
> INVALID_ARRAY_INDEX);
> +                               j = delete_tcp_item(tbl->items, j,
> +                                                       &tbl->item_num,
> INVALID_ARRAY_INDEX);
>                                 tbl->flows[i].start_index = j;
>                                 if (j == INVALID_ARRAY_INDEX)
>                                         tbl->flow_num--;
> diff --git a/lib/gro/gro_tcp4.h b/lib/gro/gro_tcp4.h
> index 212f97a042..245e5da486 100644
> --- a/lib/gro/gro_tcp4.h
> +++ b/lib/gro/gro_tcp4.h
> @@ -5,32 +5,15 @@
>  #ifndef _GRO_TCP4_H_
>  #define _GRO_TCP4_H_
>
> -#include <rte_tcp.h>
> +#include "gro_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 */
> +/* Header fields representing common fields in TCP flow */
>  struct tcp4_flow_key {
> -       struct rte_ether_addr eth_saddr;
> -       struct rte_ether_addr eth_daddr;
> +       struct cmn_tcp_key cmn_key;
>         uint32_t ip_src_addr;
>         uint32_t ip_dst_addr;
> -
> -       uint32_t recv_ack;
> -       uint16_t src_port;
> -       uint16_t dst_port;
>  };
>
>  struct gro_tcp4_flow {
> @@ -42,42 +25,12 @@ 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 */
> @@ -186,120 +139,9 @@ uint32_t gro_tcp4_tbl_pkt_count(void *tbl);
>  static inline int
>  is_same_tcp4_flow(struct tcp4_flow_key k1, struct tcp4_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) &&
> +       return ((k1.ip_src_addr == k2.ip_src_addr) &&
>                         (k1.ip_dst_addr == k2.ip_dst_addr) &&
> -                       (k1.recv_ack == k2.recv_ack) &&
> -                       (k1.src_port == k2.src_port) &&
> -                       (k1.dst_port == k2.dst_port));
> +                       is_same_common_tcp_key(&k1.cmn_key, &k2.cmn_key));
>  }
>
> -/*
> - * 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..5aa39801e1
> --- /dev/null
> +++ b/lib/gro/gro_tcp6.c
> @@ -0,0 +1,268 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2023 Intel Corporation
> + */
> +
> +#include <rte_malloc.h>
> +#include <rte_mbuf.h>
> +#include <rte_ethdev.h>
> +
> +#include "gro_tcp6.h"
> +#include "gro_tcp_internal.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_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_flow(struct gro_tcp6_tbl *tbl,
> +               struct tcp6_flow_key *src,
> +               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);
> +
> +       ASSIGN_COMMON_TCP_KEY((&src->cmn_key), (&dst->cmn_key));
> +       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->vtc_flow = src->vtc_flow;
> +
> +       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_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;
> +       int32_t tcp_dl;
> +       uint16_t ip_tlen;
> +       struct tcp6_flow_key key;
> +       uint32_t i, max_flow_num, remaining_flow_num;
> +       uint32_t sent_seq;
> +       struct rte_tcp_hdr *tcp_hdr;
> +       uint8_t find;
> +       uint32_t item_idx;
> +       /*
> +        * 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 = rte_pktmbuf_mtod_offset(pkt, struct rte_tcp_hdr *,
> pkt->l2_len + 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);
> +       /*
> +        * 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;
> +
> +       rte_ether_addr_copy(&(eth_hdr->src_addr),
> &(key.cmn_key.eth_saddr));
> +       rte_ether_addr_copy(&(eth_hdr->dst_addr),
> &(key.cmn_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.cmn_key.src_port = tcp_hdr->src_port;
> +       key.cmn_key.dst_port = tcp_hdr->dst_port;
> +       key.cmn_key.recv_ack = tcp_hdr->recv_ack;
> +       key.vtc_flow = ipv6_hdr->vtc_flow;
> +
> +       /* 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)) {
> +                               find = 1;
> +                               break;
> +                       }
> +                       remaining_flow_num--;
> +               }
> +       }
> +
> +       if (find == 0) {
> +               sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
> +               item_idx = insert_new_tcp_item(pkt, tbl->items,
> &tbl->item_num,
> +                                               tbl->max_item_num,
> start_time,
> +                                               INVALID_ARRAY_INDEX,
> sent_seq, 0, true);
> +               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
> +                        * stored packet.
> +                        */
> +                       delete_tcp_item(tbl->items, item_idx,
> &tbl->item_num, INVALID_ARRAY_INDEX);
> +                       return -1;
> +               }
> +               return 0;
> +       }
> +
> +       return process_tcp_item(pkt, tcp_hdr, tcp_dl, tbl->items,
> tbl->flows[i].start_index,
> +                                               &tbl->item_num,
> tbl->max_item_num,
> +                                               0, true, start_time);
> +}
> +
> +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_tcp_item(tbl->items, j,
> +                                               &tbl->item_num,
> 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..073122f0ec
> --- /dev/null
> +++ b/lib/gro/gro_tcp6.h
> @@ -0,0 +1,160 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2023 Intel Corporation
> + */
> +
> +#ifndef _GRO_TCP6_H_
> +#define _GRO_TCP6_H_
> +
> +#include "gro_tcp.h"
> +
> +#define GRO_TCP6_TBL_MAX_ITEM_NUM (1024UL * 1024UL)
> +
> +/* Header fields representing a TCP/IPv6 flow */
> +struct tcp6_flow_key {
> +       struct cmn_tcp_key cmn_key;
> +       uint8_t  src_addr[16];
> +       uint8_t  dst_addr[16];
> +       rte_be32_t vtc_flow;
> +};
> +
> +struct gro_tcp6_flow {
> +       struct tcp6_flow_key key;
> +       /*
> +        * 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/IPv6 reassembly table,
> + * and without updating checksums.
> + *
> + * @param tbl
> + *  TCP/IPv6 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/IPv6
> + * reassembly table.
> + *
> + * @param tbl
> + *  TCP/IPv6 reassembly table pointer
> + *
> + * @return
> + *  The number of packets in the table
> + */
> +uint32_t gro_tcp6_tbl_pkt_count(void *tbl);
> +
> +/*
> + * Check if two TCP/IPv6 packets belong to the same flow.
> + */
> +static inline int
> +is_same_tcp6_flow(struct tcp6_flow_key *k1, struct tcp6_flow_key *k2)
> +{
> +       rte_be32_t vtc_flow_diff;
> +
> +       if (memcmp(&k1->src_addr, &k2->src_addr, 16))
> +               return 0;
> +       if (memcmp(&k1->dst_addr, &k2->dst_addr, 16))
> +               return 0;
> +       /*
> +        * IP version (4) Traffic Class (8) Flow Label (20)
> +        * All fields except Traffic class should be same
> +        */
> +       vtc_flow_diff = (k1->vtc_flow ^ k2->vtc_flow);
> +       if (vtc_flow_diff & htonl(0xF00FFFFF))
> +               return 0;
> +
> +       return is_same_common_tcp_key(&k1->cmn_key, &k2->cmn_key);
> +}
> +
> +#endif
> diff --git a/lib/gro/gro_tcp_internal.h b/lib/gro/gro_tcp_internal.h
> new file mode 100644
> index 0000000000..cc84abeaeb
> --- /dev/null
> +++ b/lib/gro/gro_tcp_internal.h
> @@ -0,0 +1,128 @@
> +
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2023 Intel Corporation
> + */
> +
> +#ifndef _GRO_TCP_INTERNAL_H_
> +#define _GRO_TCP_INTERNAL_H_
> +
> +static inline uint32_t
> +find_an_empty_item(struct gro_tcp_item *items,
> +       uint32_t max_item_num)
> +{
> +       uint32_t i;
> +
> +       for (i = 0; i < max_item_num; i++)
> +               if (items[i].firstseg == NULL)
> +                       return i;
> +       return INVALID_ARRAY_INDEX;
> +}
> +
> +static inline uint32_t
> +insert_new_tcp_item(struct rte_mbuf *pkt,
> +               struct gro_tcp_item *items,
> +               uint32_t *item_num,
> +               uint32_t max_item_num,
> +               uint64_t start_time,
> +               uint32_t prev_idx,
> +               uint32_t sent_seq,
> +               uint16_t ip_id,
> +               uint8_t is_atomic)
> +{
> +       uint32_t item_idx;
> +
> +       item_idx = find_an_empty_item(items, max_item_num);
> +       if (item_idx == INVALID_ARRAY_INDEX)
> +               return INVALID_ARRAY_INDEX;
> +
> +       items[item_idx].firstseg = pkt;
> +       items[item_idx].lastseg = rte_pktmbuf_lastseg(pkt);
> +       items[item_idx].start_time = start_time;
> +       items[item_idx].next_pkt_idx = INVALID_ARRAY_INDEX;
> +       items[item_idx].sent_seq = sent_seq;
> +       items[item_idx].l3.ip_id = ip_id;
> +       items[item_idx].nb_merged = 1;
> +       items[item_idx].is_atomic = is_atomic;
> +       (*item_num) += 1;
> +
> +       /* if the previous packet exists, chain them together. */
> +       if (prev_idx != INVALID_ARRAY_INDEX) {
> +               items[item_idx].next_pkt_idx =
> +                       items[prev_idx].next_pkt_idx;
> +               items[prev_idx].next_pkt_idx = item_idx;
> +       }
> +
> +       return item_idx;
> +}
> +
> +static inline uint32_t
> +delete_tcp_item(struct gro_tcp_item *items, uint32_t item_idx,
> +               uint32_t *item_num,
> +               uint32_t prev_item_idx)
> +{
> +       uint32_t next_idx = items[item_idx].next_pkt_idx;
> +
> +       /* NULL indicates an empty item */
> +       items[item_idx].firstseg = NULL;
> +       (*item_num) -= 1;
> +       if (prev_item_idx != INVALID_ARRAY_INDEX)
> +               items[prev_item_idx].next_pkt_idx = next_idx;
> +
> +       return next_idx;
> +}
> +
> +static inline int32_t
> +process_tcp_item(struct rte_mbuf *pkt,
> +       struct rte_tcp_hdr *tcp_hdr,
> +       int32_t tcp_dl,
> +       struct gro_tcp_item *items,
> +       uint32_t item_idx,
> +       uint32_t *item_num,
> +       uint32_t max_item_num,
> +       uint16_t ip_id,
> +       uint8_t is_atomic,
> +       uint64_t start_time)
> +{
> +       uint32_t cur_idx;
> +       uint32_t prev_idx;
> +       int cmp;
> +       uint32_t sent_seq;
> +
> +       sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
> +       /*
> +        * Check all packets in the flow and try to find a neighbor for
> +        * the input packet.
> +        */
> +       cur_idx = item_idx;
> +       prev_idx = cur_idx;
> +       do {
> +               cmp = check_seq_option(&items[cur_idx], tcp_hdr,
> +                               sent_seq, ip_id, pkt->l4_len, tcp_dl, 0,
> +                               is_atomic);
> +               if (cmp) {
> +                       if (merge_two_tcp_packets(&items[cur_idx],
> +                                               pkt, cmp, sent_seq, ip_id,
> 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_tcp_item(pkt, items, item_num,
> max_item_num,
> +                                               start_time, cur_idx,
> sent_seq, ip_id, is_atomic) ==
> +                                       INVALID_ARRAY_INDEX)
> +                               return -1;
> +                       return 0;
> +               }
> +               prev_idx = cur_idx;
> +               cur_idx = 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_tcp_item(pkt, items, item_num, max_item_num,
> start_time, prev_idx, sent_seq,
> +                               ip_id, is_atomic) == INVALID_ARRAY_INDEX)
> +               return -1;
> +
> +       return 0;
> +}
> +#endif
> diff --git a/lib/gro/gro_vxlan_tcp4.c b/lib/gro/gro_vxlan_tcp4.c
> index 3be4deb7c7..6ab7001922 100644
> --- a/lib/gro/gro_vxlan_tcp4.c
> +++ b/lib/gro/gro_vxlan_tcp4.c
> @@ -116,7 +116,7 @@ insert_new_item(struct gro_vxlan_tcp4_tbl *tbl,
>         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.l3.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;
> @@ -163,15 +163,9 @@ insert_new_flow(struct gro_vxlan_tcp4_tbl *tbl,
>
>         dst = &(tbl->flows[flow_idx].key);
>
> -       rte_ether_addr_copy(&(src->inner_key.eth_saddr),
> -                       &(dst->inner_key.eth_saddr));
> -       rte_ether_addr_copy(&(src->inner_key.eth_daddr),
> -                       &(dst->inner_key.eth_daddr));
> +       ASSIGN_COMMON_TCP_KEY((&(src->inner_key.cmn_key)),
> (&(dst->inner_key.cmn_key)));
>         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;
> @@ -248,7 +242,7 @@ 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. */
> @@ -357,13 +351,13 @@ gro_vxlan_tcp4_reassemble(struct rte_mbuf *pkt,
>
>         sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
>
> -       rte_ether_addr_copy(&(eth_hdr->src_addr),
> &(key.inner_key.eth_saddr));
> -       rte_ether_addr_copy(&(eth_hdr->dst_addr),
> &(key.inner_key.eth_daddr));
> +       rte_ether_addr_copy(&(eth_hdr->src_addr),
> &(key.inner_key.cmn_key.eth_saddr));
> +       rte_ether_addr_copy(&(eth_hdr->dst_addr),
> &(key.inner_key.cmn_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.inner_key.cmn_key.recv_ack = tcp_hdr->recv_ack;
> +       key.inner_key.cmn_key.src_port = tcp_hdr->src_port;
> +       key.inner_key.cmn_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;
> diff --git a/lib/gro/gro_vxlan_tcp4.h b/lib/gro/gro_vxlan_tcp4.h
> index 7832942a68..662db01a88 100644
> --- a/lib/gro/gro_vxlan_tcp4.h
> +++ b/lib/gro/gro_vxlan_tcp4.h
> @@ -36,7 +36,7 @@ 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..d824eebd93 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();
>
> @@ -371,6 +412,11 @@ 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 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];
>         }
> @@ -426,6 +472,15 @@ 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..c83dfd9ad1 100644
> --- a/lib/gro/rte_gro.h
> +++ b/lib/gro/rte_gro.h
> @@ -38,6 +38,9 @@ extern "C" {
>  #define RTE_GRO_IPV4_VXLAN_UDP_IPV4_INDEX 3
>  #define RTE_GRO_IPV4_VXLAN_UDP_IPV4 (1ULL <<
> RTE_GRO_IPV4_VXLAN_UDP_IPV4_INDEX)
>  /**< VxLAN UDP/IPv4 GRO flag. */
> +#define RTE_GRO_TCP_IPV6_INDEX 4
> +#define RTE_GRO_TCP_IPV6 (1ULL << RTE_GRO_TCP_IPV6_INDEX)
> +/**< TCP/IPv6 GRO flag. */
>
>  /**
>   * Structure used to create GRO context objects or used to pass
> --
> 2.25.1
>
>>  Hi Jiyau, In the recent patch I have moved the functions that had the
>> error in Windows to the header file and since that is used by gro_tcp6.c
>> and gro_tcp4.c, I have moved it to gro_tcp_internal.h. There are other
>> functions and ds reused by gro_vxlan_tcp4.c, I have moved them to gro_tcp.h
>> so that the functions that are not used by gro_vxlan_tcp4.c will not be
>> included.
>>
>

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