1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2017 Intel Corporation
3 */
4
5 #include "gso_common.h"
6 #include "gso_tcp4.h"
7
8 static void
update_ipv4_tcp_headers(struct rte_mbuf * pkt,uint8_t ipid_delta,struct rte_mbuf ** segs,uint16_t nb_segs)9 update_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 id, tail_idx, i;
16 uint16_t l3_offset = pkt->l2_len;
17 uint16_t l4_offset = l3_offset + pkt->l3_len;
18
19 ipv4_hdr = rte_pktmbuf_mtod_offset(pkt, struct rte_ipv4_hdr *,
20 l3_offset);
21 tcp_hdr = (struct rte_tcp_hdr *)((char *)ipv4_hdr + pkt->l3_len);
22 id = rte_be_to_cpu_16(ipv4_hdr->packet_id);
23 sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq);
24 tail_idx = nb_segs - 1;
25
26 for (i = 0; i < nb_segs; i++) {
27 update_ipv4_header(segs[i], l3_offset, id);
28 update_tcp_header(segs[i], l4_offset, sent_seq, i < tail_idx);
29 id += ipid_delta;
30 sent_seq += (segs[i]->pkt_len - segs[i]->data_len);
31 }
32 }
33
34 int
gso_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)35 gso_tcp4_segment(struct rte_mbuf *pkt,
36 uint16_t gso_size,
37 uint8_t ipid_delta,
38 struct rte_mempool *direct_pool,
39 struct rte_mempool *indirect_pool,
40 struct rte_mbuf **pkts_out,
41 uint16_t nb_pkts_out)
42 {
43 struct rte_ipv4_hdr *ipv4_hdr;
44 uint16_t pyld_unit_size, hdr_offset;
45 uint16_t frag_off;
46 int ret;
47
48 /* Don't process the fragmented packet */
49 ipv4_hdr = rte_pktmbuf_mtod_offset(pkt, struct rte_ipv4_hdr *,
50 pkt->l2_len);
51 frag_off = rte_be_to_cpu_16(ipv4_hdr->fragment_offset);
52 if (unlikely(IS_FRAGMENTED(frag_off))) {
53 return 0;
54 }
55
56 /* Don't process the packet without data */
57 hdr_offset = pkt->l2_len + pkt->l3_len + pkt->l4_len;
58 if (unlikely(hdr_offset >= pkt->pkt_len)) {
59 return 0;
60 }
61
62 pyld_unit_size = gso_size - hdr_offset;
63
64 /* Segment the payload */
65 ret = gso_do_segment(pkt, hdr_offset, pyld_unit_size, direct_pool,
66 indirect_pool, pkts_out, nb_pkts_out);
67 if (ret > 1)
68 update_ipv4_tcp_headers(pkt, ipid_delta, pkts_out, ret);
69
70 return ret;
71 }
72