examples/l3fwd/l3fwd_em.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2016 Intel Corporation
   3  */
   4
   5 #ifndef __L3FWD_EM_H__
   6 #define __L3FWD_EM_H__
   7
   8 static __rte_always_inline void
   9 l3fwd_em_simple_forward(struct rte_mbuf *m, uint16_t portid,
  10                 struct lcore_conf *qconf)
  11 {
  12         struct rte_ether_hdr *eth_hdr;
  13         struct ipv4_hdr *ipv4_hdr;
  14         uint16_t dst_port;
  15         uint32_t tcp_or_udp;
  16         uint32_t l3_ptypes;
  17
  18         eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
  19         tcp_or_udp = m->packet_type & (RTE_PTYPE_L4_TCP | RTE_PTYPE_L4_UDP);
  20         l3_ptypes = m->packet_type & RTE_PTYPE_L3_MASK;
  21
  22         if (tcp_or_udp && (l3_ptypes == RTE_PTYPE_L3_IPV4)) {
  23                 /* Handle IPv4 headers.*/
  24                 ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *,
  25                                                 sizeof(struct rte_ether_hdr));
  26
  27 #ifdef DO_RFC_1812_CHECKS
  28                 /* Check to make sure the packet is valid (RFC1812) */
  29                 if (is_valid_ipv4_pkt(ipv4_hdr, m->pkt_len) < 0) {
  30                         rte_pktmbuf_free(m);
  31                         return;
  32                 }
  33 #endif
  34                 dst_port = em_get_ipv4_dst_port(ipv4_hdr, portid,
  35                                                 qconf->ipv4_lookup_struct);
  36
  37                 if (dst_port >= RTE_MAX_ETHPORTS ||
  38                         (enabled_port_mask & 1 << dst_port) == 0)
  39                         dst_port = portid;
  40
  41 #ifdef DO_RFC_1812_CHECKS
  42                 /* Update time to live and header checksum */
  43                 --(ipv4_hdr->time_to_live);
  44                 ++(ipv4_hdr->hdr_checksum);
  45 #endif
  46                 /* dst addr */
  47                 *(uint64_t *)&eth_hdr->d_addr = dest_eth_addr[dst_port];
  48
  49                 /* src addr */
  50                 ether_addr_copy(&ports_eth_addr[dst_port], &eth_hdr->s_addr);
  51
  52                 send_single_packet(qconf, m, dst_port);
  53         } else if (tcp_or_udp && (l3_ptypes == RTE_PTYPE_L3_IPV6)) {
  54                 /* Handle IPv6 headers.*/
  55                 struct ipv6_hdr *ipv6_hdr;
  56
  57                 ipv6_hdr = rte_pktmbuf_mtod_offset(m, struct ipv6_hdr *,
  58                                                 sizeof(struct rte_ether_hdr));
  59
  60                 dst_port = em_get_ipv6_dst_port(ipv6_hdr, portid,
  61                                         qconf->ipv6_lookup_struct);
  62
  63                 if (dst_port >= RTE_MAX_ETHPORTS ||
  64                         (enabled_port_mask & 1 << dst_port) == 0)
  65                         dst_port = portid;
  66
  67                 /* dst addr */
  68                 *(uint64_t *)&eth_hdr->d_addr = dest_eth_addr[dst_port];
  69
  70                 /* src addr */
  71                 ether_addr_copy(&ports_eth_addr[dst_port], &eth_hdr->s_addr);
  72
  73                 send_single_packet(qconf, m, dst_port);
  74         } else {
  75                 /* Free the mbuf that contains non-IPV4/IPV6 packet */
  76                 rte_pktmbuf_free(m);
  77         }
  78 }
  79
  80 /*
  81  * Buffer non-optimized handling of packets, invoked
  82  * from main_loop.
  83  */
  84 static inline void
  85 l3fwd_em_no_opt_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
  86                         uint16_t portid, struct lcore_conf *qconf)
  87 {
  88         int32_t j;
  89
  90         /* Prefetch first packets */
  91         for (j = 0; j < PREFETCH_OFFSET && j < nb_rx; j++)
  92                 rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j], void *));
  93
  94         /*
  95          * Prefetch and forward already prefetched
  96          * packets.
  97          */
  98         for (j = 0; j < (nb_rx - PREFETCH_OFFSET); j++) {
  99                 rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[
 100                                 j + PREFETCH_OFFSET], void *));
 101                 l3fwd_em_simple_forward(pkts_burst[j], portid, qconf);
 102         }
 103
 104         /* Forward remaining prefetched packets */
 105         for (; j < nb_rx; j++)
 106                 l3fwd_em_simple_forward(pkts_burst[j], portid, qconf);
 107 }
 108
 109 #endif /* __L3FWD_EM_H__ */