LXR linux/tools/testing/selftests/bpf/progs/test_xdp_with_cpumap

   1// SPDX-License-Identifier: GPL-2.0
   2
   3#include <linux/bpf.h>
   4#include <bpf/bpf_helpers.h>
   5
   6#define IFINDEX_LO      1
   7
   8struct {
   9        __uint(type, BPF_MAP_TYPE_CPUMAP);
  10        __uint(key_size, sizeof(__u32));
  11        __uint(value_size, sizeof(struct bpf_cpumap_val));
  12        __uint(max_entries, 4);
  13} cpu_map SEC(".maps");
  14
  15SEC("xdp_redir")
  16int xdp_redir_prog(struct xdp_md *ctx)
  17{
  18        return bpf_redirect_map(&cpu_map, 1, 0);
  19}
  20
  21SEC("xdp_dummy")
  22int xdp_dummy_prog(struct xdp_md *ctx)
  23{
  24        return XDP_PASS;
  25}
  26
  27SEC("xdp_cpumap/dummy_cm")
  28int xdp_dummy_cm(struct xdp_md *ctx)
  29{
  30        if (ctx->ingress_ifindex == IFINDEX_LO)
  31                return XDP_DROP;
  32
  33        return XDP_PASS;
  34}
  35
  36char _license[] SEC("license") = "GPL";
  37