-/*
- * 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)
-{
- struct rte_mbuf *pkt_head, *pkt_tail, *lastseg;
- uint16_t hdr_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 = pkt_head->l2_len + pkt_head->l3_len + pkt_head->l4_len;
- if (unlikely(pkt_head->pkt_len - pkt_head->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->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 tcp_hdr *tcph,
- uint32_t sent_seq,
- uint16_t ip_id,
- uint16_t tcp_hl,
- uint16_t tcp_dl)
-{
- struct rte_mbuf *pkt_orig = item->firstseg;
- struct ipv4_hdr *iph_orig;
- struct tcp_hdr *tcph_orig;
- uint16_t len, tcp_hl_orig;
-
- iph_orig = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt_orig, char *) +
- pkt_orig->l2_len);
- tcph_orig = (struct 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 tcp_hdr);
- if ((tcp_hl != tcp_hl_orig) ||
- ((len > 0) && (memcmp(tcph + 1, tcph_orig + 1,
- len) != 0)))
- return 0;
-
- /* check if the two packets are neighbors */
- len = pkt_orig->pkt_len - pkt_orig->l2_len - pkt_orig->l3_len -
- tcp_hl_orig;
- if ((sent_seq == item->sent_seq + len) && (ip_id == item->ip_id + 1))
- /* append the new packet */
- return 1;
- else if ((sent_seq + tcp_dl == item->sent_seq) &&
- (ip_id + item->nb_merged == item->ip_id))
- /* pre-pend the new packet */
- return -1;
-
- return 0;
-}
-