ceph/src/seastar/dpdk/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 }