build: use static deps for pkg-config libs.private
[dpdk.git] / lib / librte_gso / gso_tunnel_tcp4.c
1 /* SPDX-License-Identifier: BSD-3-Clause
2  * Copyright(c) 2017 Intel Corporation
3  */
4
5 #include "gso_common.h"
6 #include "gso_tunnel_tcp4.h"
7
8 static void
9 update_tunnel_ipv4_tcp_headers(struct rte_mbuf *pkt, uint8_t ipid_delta,
10                 struct rte_mbuf **segs, uint16_t nb_segs)
11 {
12         struct ipv4_hdr *ipv4_hdr;
13         struct tcp_hdr *tcp_hdr;
14         uint32_t sent_seq;
15         uint16_t outer_id, inner_id, tail_idx, i;
16         uint16_t outer_ipv4_offset, inner_ipv4_offset;
17         uint16_t udp_gre_offset, tcp_offset;
18         uint8_t update_udp_hdr;
19
20         outer_ipv4_offset = pkt->outer_l2_len;
21         udp_gre_offset = outer_ipv4_offset + pkt->outer_l3_len;
22         inner_ipv4_offset = udp_gre_offset + pkt->l2_len;
23         tcp_offset = inner_ipv4_offset + pkt->l3_len;
24
25         /* Outer IPv4 header. */
26         ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
27                         outer_ipv4_offset);
28         outer_id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
29
30         /* Inner IPv4 header. */
31         ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
32                         inner_ipv4_offset);
33         inner_id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
34
35         tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + pkt->l3_len);
36         sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
37         tail_idx = nb_segs - 1;
38
39         /* Only update UDP header for VxLAN packets. */
40         update_udp_hdr = (pkt->ol_flags & PKT_TX_TUNNEL_VXLAN) ? 1 : 0;
41
42         for (i = 0; i < nb_segs; i++) {
43                 update_ipv4_header(segs[i], outer_ipv4_offset, outer_id);
44                 if (update_udp_hdr)
45                         update_udp_header(segs[i], udp_gre_offset);
46                 update_ipv4_header(segs[i], inner_ipv4_offset, inner_id);
47                 update_tcp_header(segs[i], tcp_offset, sent_seq, i < tail_idx);
48                 outer_id++;
49                 inner_id += ipid_delta;
50                 sent_seq += (segs[i]->pkt_len - segs[i]->data_len);
51         }
52 }
53
54 int
55 gso_tunnel_tcp4_segment(struct rte_mbuf *pkt,
56                 uint16_t gso_size,
57                 uint8_t ipid_delta,
58                 struct rte_mempool *direct_pool,
59                 struct rte_mempool *indirect_pool,
60                 struct rte_mbuf **pkts_out,
61                 uint16_t nb_pkts_out)
62 {
63         struct ipv4_hdr *inner_ipv4_hdr;
64         uint16_t pyld_unit_size, hdr_offset, frag_off;
65         int ret = 1;
66
67         hdr_offset = pkt->outer_l2_len + pkt->outer_l3_len + pkt->l2_len;
68         inner_ipv4_hdr = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, char *) +
69                         hdr_offset);
70         /*
71          * Don't process the packet whose MF bit or offset in the inner
72          * IPv4 header are non-zero.
73          */
74         frag_off = rte_be_to_cpu_16(inner_ipv4_hdr->fragment_offset);
75         if (unlikely(IS_FRAGMENTED(frag_off))) {
76                 pkts_out[0] = pkt;
77                 return 1;
78         }
79
80         hdr_offset += pkt->l3_len + pkt->l4_len;
81         /* Don't process the packet without data */
82         if (hdr_offset >= pkt->pkt_len) {
83                 pkts_out[0] = pkt;
84                 return 1;
85         }
86         pyld_unit_size = gso_size - hdr_offset;
87
88         /* Segment the payload */
89         ret = gso_do_segment(pkt, hdr_offset, pyld_unit_size, direct_pool,
90                         indirect_pool, pkts_out, nb_pkts_out);
91         if (ret <= 1)
92                 return ret;
93
94         update_tunnel_ipv4_tcp_headers(pkt, ipid_delta, pkts_out, ret);
95
96         return ret;
97 }