ceph/src/spdk/dpdk/test/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  * To compile:
  10  * clang -O2 -I${RTE_SDK}/${RTE_TARGET}/include \
  11  * -target bpf -Wno-int-to-void-pointer-cast -c t3.c
  12  */
  13
  14 #include <stdint.h>
  15 #include <stddef.h>
  16 #include <stdio.h>
  17 #include <net/ethernet.h>
  18 #include <rte_config.h>
  19 #include "mbuf.h"
  20
  21 extern void rte_pktmbuf_dump(FILE *, const struct rte_mbuf *, unsigned int);
  22
  23 uint64_t
  24 entry(const void *pkt)
  25 {
  26         const struct rte_mbuf *mb;
  27         const struct ether_header *eth;
  28
  29         mb = pkt;
  30         eth = rte_pktmbuf_mtod(mb, const struct ether_header *);
  31
  32         if (eth->ether_type == __builtin_bswap16(ETHERTYPE_ARP))
  33                 rte_pktmbuf_dump(stdout, mb, 64);
  34
  35         return 1;
  36 }