tools/testing/selftests/bpf/prog_tests/xdp_cpumap_attach.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <uapi/linux/bpf.h>
   3 #include <linux/if_link.h>
   4 #include <test_progs.h>
   5
   6 #include "test_xdp_with_cpumap_helpers.skel.h"
   7
   8 #define IFINDEX_LO      1
   9
  10 void test_xdp_with_cpumap_helpers(void)
  11 {
  12         struct test_xdp_with_cpumap_helpers *skel;
  13         struct bpf_prog_info info = {};
  14         struct bpf_cpumap_val val = {
  15                 .qsize = 192,
  16         };
  17         __u32 duration = 0, idx = 0;
  18         __u32 len = sizeof(info);
  19         int err, prog_fd, map_fd;
  20
  21         skel = test_xdp_with_cpumap_helpers__open_and_load();
  22         if (CHECK_FAIL(!skel)) {
  23                 perror("test_xdp_with_cpumap_helpers__open_and_load");
  24                 return;
  25         }
  26
  27         /* can not attach program with cpumaps that allow programs
  28          * as xdp generic
  29          */
  30         prog_fd = bpf_program__fd(skel->progs.xdp_redir_prog);
  31         err = bpf_set_link_xdp_fd(IFINDEX_LO, prog_fd, XDP_FLAGS_SKB_MODE);
  32         CHECK(err == 0, "Generic attach of program with 8-byte CPUMAP",
  33               "should have failed\n");
  34
  35         prog_fd = bpf_program__fd(skel->progs.xdp_dummy_cm);
  36         map_fd = bpf_map__fd(skel->maps.cpu_map);
  37         err = bpf_obj_get_info_by_fd(prog_fd, &info, &len);
  38         if (CHECK_FAIL(err))
  39                 goto out_close;
  40
  41         val.bpf_prog.fd = prog_fd;
  42         err = bpf_map_update_elem(map_fd, &idx, &val, 0);
  43         CHECK(err, "Add program to cpumap entry", "err %d errno %d\n",
  44               err, errno);
  45
  46         err = bpf_map_lookup_elem(map_fd, &idx, &val);
  47         CHECK(err, "Read cpumap entry", "err %d errno %d\n", err, errno);
  48         CHECK(info.id != val.bpf_prog.id, "Expected program id in cpumap entry",
  49               "expected %u read %u\n", info.id, val.bpf_prog.id);
  50
  51         /* can not attach BPF_XDP_CPUMAP program to a device */
  52         err = bpf_set_link_xdp_fd(IFINDEX_LO, prog_fd, XDP_FLAGS_SKB_MODE);
  53         CHECK(err == 0, "Attach of BPF_XDP_CPUMAP program",
  54               "should have failed\n");
  55
  56         val.qsize = 192;
  57         val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_prog);
  58         err = bpf_map_update_elem(map_fd, &idx, &val, 0);
  59         CHECK(err == 0, "Add non-BPF_XDP_CPUMAP program to cpumap entry",
  60               "should have failed\n");
  61
  62 out_close:
  63         test_xdp_with_cpumap_helpers__destroy(skel);
  64 }
  65
  66 void test_xdp_cpumap_attach(void)
  67 {
  68         if (test__start_subtest("cpumap_with_progs"))
  69                 test_xdp_with_cpumap_helpers();
  70 }