LXR dpdk/examples/bpf/t3.c

   1/* SPDX-License-Identifier: BSD-3-Clause
   2 * Copyright(c) 2018 Intel Corporation
   3 */
   4
   5/*
   6 * eBPF program sample.
   7 * Accepts pointer to struct rte_mbuf as an input parameter.
   8 * Dump the mbuf into stdout if it is an ARP packet (aka tcpdump 'arp').
   9 *
  10 * To compile on x86:
  11 * clang -O2 -U __GNUC__ -target bpf -Wno-int-to-void-pointer-cast -c t3.c
  12 *
  13 * To compile on ARM:
  14 * clang -O2 -I/usr/include/aarch64-linux-gnu -target bpf \
  15 * -Wno-int-to-void-pointer-cast -c t3.c
  16 *
  17 * NOTE: if DPDK is not installed system-wide, add compiler flag with path
  18 * to DPDK rte_mbuf.h file to above commands,
  19 * e.g. "clang -I/path/to/dpdk/headers -O2 ..."
  20 */
  21
  22#include <stdint.h>
  23#include <stddef.h>
  24#include <stdio.h>
  25#include <net/ethernet.h>
  26#include <rte_config.h>
  27#include <rte_mbuf_core.h>
  28#include <arpa/inet.h>
  29
  30extern void rte_pktmbuf_dump(FILE *, const struct rte_mbuf *, unsigned int);
  31
  32uint64_t
  33entry(const void *pkt)
  34{
  35        const struct rte_mbuf *mb;
  36        const struct ether_header *eth;
  37
  38        mb = pkt;
  39        eth = rte_pktmbuf_mtod(mb, const struct ether_header *);
  40
  41        if (eth->ether_type == htons(ETHERTYPE_ARP))
  42                rte_pktmbuf_dump(stdout, mb, 64);
  43
  44        return 1;
  45}
  46