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
update_tunnel_ipv4_tcp_headers(struct rte_mbuf * pkt,uint8_t ipid_delta,struct rte_mbuf ** segs,uint16_t nb_segs)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 rte_ipv4_hdr *ipv4_hdr;
13 struct rte_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 = rte_pktmbuf_mtod_offset(pkt, struct rte_ipv4_hdr *,
27 outer_ipv4_offset);
28 outer_id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
29
30 /* Inner IPv4 header. */
31 ipv4_hdr = rte_pktmbuf_mtod_offset(pkt, struct rte_ipv4_hdr *,
32 inner_ipv4_offset);
33 inner_id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
34
35 tcp_hdr = (struct rte_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 & RTE_MBUF_F_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
gso_tunnel_tcp4_segment(struct rte_mbuf * pkt,uint16_t gso_size,uint8_t ipid_delta,struct rte_mempool * direct_pool,struct rte_mempool * indirect_pool,struct rte_mbuf ** pkts_out,uint16_t nb_pkts_out)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 rte_ipv4_hdr *inner_ipv4_hdr;
64 uint16_t pyld_unit_size, hdr_offset, frag_off;
65 int ret;
66
67 hdr_offset = pkt->outer_l2_len + pkt->outer_l3_len + pkt->l2_len;
68 inner_ipv4_hdr = rte_pktmbuf_mtod_offset(pkt, struct rte_ipv4_hdr *,
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 return 0;
77 }
78
79 hdr_offset += pkt->l3_len + pkt->l4_len;
80 /* Don't process the packet without data */
81 if (hdr_offset >= pkt->pkt_len) {
82 return 0;
83 }
84 pyld_unit_size = gso_size - hdr_offset;
85
86 /* Segment the payload */
87 ret = gso_do_segment(pkt, hdr_offset, pyld_unit_size, direct_pool,
88 indirect_pool, pkts_out, nb_pkts_out);
89 if (ret > 1)
90 update_tunnel_ipv4_tcp_headers(pkt, ipid_delta, pkts_out, ret);
91
92 return ret;
93 }
94