examples/l3fwd/l3fwd_lpm.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2016 Intel Corporation
   3  */
   4
   5 #ifndef __L3FWD_LPM_H__
   6 #define __L3FWD_LPM_H__
   7
   8 static __rte_always_inline void
   9 l3fwd_lpm_simple_forward(struct rte_mbuf *m, uint16_t portid,
  10                 struct lcore_conf *qconf)
  11 {
  12         struct ether_hdr *eth_hdr;
  13         struct ipv4_hdr *ipv4_hdr;
  14         uint16_t dst_port;
  15
  16         eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
  17
  18         if (RTE_ETH_IS_IPV4_HDR(m->packet_type)) {
  19                 /* Handle IPv4 headers.*/
  20                 ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *,
  21                                                    sizeof(struct ether_hdr));
  22
  23 #ifdef DO_RFC_1812_CHECKS
  24                 /* Check to make sure the packet is valid (RFC1812) */
  25                 if (is_valid_ipv4_pkt(ipv4_hdr, m->pkt_len) < 0) {
  26                         rte_pktmbuf_free(m);
  27                         return;
  28                 }
  29 #endif
  30                  dst_port = lpm_get_ipv4_dst_port(ipv4_hdr, portid,
  31                                                 qconf->ipv4_lookup_struct);
  32
  33                 if (dst_port >= RTE_MAX_ETHPORTS ||
  34                         (enabled_port_mask & 1 << dst_port) == 0)
  35                         dst_port = portid;
  36
  37 #ifdef DO_RFC_1812_CHECKS
  38                 /* Update time to live and header checksum */
  39                 --(ipv4_hdr->time_to_live);
  40                 ++(ipv4_hdr->hdr_checksum);
  41 #endif
  42                 /* dst addr */
  43                 *(uint64_t *)&eth_hdr->d_addr = dest_eth_addr[dst_port];
  44
  45                 /* src addr */
  46                 ether_addr_copy(&ports_eth_addr[dst_port], &eth_hdr->s_addr);
  47
  48                 send_single_packet(qconf, m, dst_port);
  49         } else if (RTE_ETH_IS_IPV6_HDR(m->packet_type)) {
  50                 /* Handle IPv6 headers.*/
  51                 struct ipv6_hdr *ipv6_hdr;
  52
  53                 ipv6_hdr = rte_pktmbuf_mtod_offset(m, struct ipv6_hdr *,
  54                                                    sizeof(struct ether_hdr));
  55
  56                 dst_port = lpm_get_ipv6_dst_port(ipv6_hdr, portid,
  57                                         qconf->ipv6_lookup_struct);
  58
  59                 if (dst_port >= RTE_MAX_ETHPORTS ||
  60                         (enabled_port_mask & 1 << dst_port) == 0)
  61                         dst_port = portid;
  62
  63                 /* dst addr */
  64                 *(uint64_t *)&eth_hdr->d_addr = dest_eth_addr[dst_port];
  65
  66                 /* src addr */
  67                 ether_addr_copy(&ports_eth_addr[dst_port], &eth_hdr->s_addr);
  68
  69                 send_single_packet(qconf, m, dst_port);
  70         } else {
  71                 /* Free the mbuf that contains non-IPV4/IPV6 packet */
  72                 rte_pktmbuf_free(m);
  73         }
  74 }
  75
  76 static inline void
  77 l3fwd_lpm_no_opt_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
  78                                 uint16_t portid, struct lcore_conf *qconf)
  79 {
  80         int32_t j;
  81
  82         /* Prefetch first packets */
  83         for (j = 0; j < PREFETCH_OFFSET && j < nb_rx; j++)
  84                 rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j], void *));
  85
  86         /* Prefetch and forward already prefetched packets. */
  87         for (j = 0; j < (nb_rx - PREFETCH_OFFSET); j++) {
  88                 rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[
  89                                 j + PREFETCH_OFFSET], void *));
  90                 l3fwd_lpm_simple_forward(pkts_burst[j], portid, qconf);
  91         }
  92
  93         /* Forward remaining prefetched packets */
  94         for (; j < nb_rx; j++)
  95                 l3fwd_lpm_simple_forward(pkts_burst[j], portid, qconf);
  96 }
  97
  98 #endif /* __L3FWD_LPM_H__ */