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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2019 Facebook */
   3 #include <test_progs.h>
   4 #include <linux/bpf.h>
   5 #include "bpf/libbpf_internal.h"
   6 #include "test_raw_tp_test_run.skel.h"
   7
   8 void test_raw_tp_test_run(void)
   9 {
  10         int comm_fd = -1, err, nr_online, i, prog_fd;
  11         __u64 args[2] = {0x1234ULL, 0x5678ULL};
  12         int expected_retval = 0x1234 + 0x5678;
  13         struct test_raw_tp_test_run *skel;
  14         char buf[] = "new_name";
  15         bool *online = NULL;
  16         LIBBPF_OPTS(bpf_test_run_opts, opts,
  17                 .ctx_in = args,
  18                 .ctx_size_in = sizeof(args),
  19                 .flags = BPF_F_TEST_RUN_ON_CPU,
  20         );
  21
  22         err = parse_cpu_mask_file("/sys/devices/system/cpu/online", &online,
  23                                   &nr_online);
  24         if (!ASSERT_OK(err, "parse_cpu_mask_file"))
  25                 return;
  26
  27         skel = test_raw_tp_test_run__open_and_load();
  28         if (!ASSERT_OK_PTR(skel, "skel_open"))
  29                 goto cleanup;
  30
  31         err = test_raw_tp_test_run__attach(skel);
  32         if (!ASSERT_OK(err, "skel_attach"))
  33                 goto cleanup;
  34
  35         comm_fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
  36         if (!ASSERT_GE(comm_fd, 0, "open /proc/self/comm"))
  37                 goto cleanup;
  38
  39         err = write(comm_fd, buf, sizeof(buf));
  40         ASSERT_GE(err, 0, "task rename");
  41
  42         ASSERT_NEQ(skel->bss->count, 0, "check_count");
  43         ASSERT_EQ(skel->data->on_cpu, 0xffffffff, "check_on_cpu");
  44
  45         prog_fd = bpf_program__fd(skel->progs.rename);
  46         opts.ctx_in = args;
  47         opts.ctx_size_in = sizeof(__u64);
  48
  49         err = bpf_prog_test_run_opts(prog_fd, &opts);
  50         ASSERT_NEQ(err, 0, "test_run should fail for too small ctx");
  51
  52         opts.ctx_size_in = sizeof(args);
  53         err = bpf_prog_test_run_opts(prog_fd, &opts);
  54         ASSERT_OK(err, "test_run");
  55         ASSERT_EQ(opts.retval, expected_retval, "check_retval");
  56
  57         for (i = 0; i < nr_online; i++) {
  58                 if (!online[i])
  59                         continue;
  60
  61                 opts.cpu = i;
  62                 opts.retval = 0;
  63                 err = bpf_prog_test_run_opts(prog_fd, &opts);
  64                 ASSERT_OK(err, "test_run_opts");
  65                 ASSERT_EQ(skel->data->on_cpu, i, "check_on_cpu");
  66                 ASSERT_EQ(opts.retval, expected_retval, "check_retval");
  67         }
  68
  69         /* invalid cpu ID should fail with ENXIO */
  70         opts.cpu = 0xffffffff;
  71         err = bpf_prog_test_run_opts(prog_fd, &opts);
  72         ASSERT_EQ(errno, ENXIO, "test_run_opts should fail with ENXIO");
  73         ASSERT_ERR(err, "test_run_opts_fail");
  74
  75         /* non-zero cpu w/o BPF_F_TEST_RUN_ON_CPU should fail with EINVAL */
  76         opts.cpu = 1;
  77         opts.flags = 0;
  78         err = bpf_prog_test_run_opts(prog_fd, &opts);
  79         ASSERT_EQ(errno, EINVAL, "test_run_opts should fail with EINVAL");
  80         ASSERT_ERR(err, "test_run_opts_fail");
  81
  82 cleanup:
  83         close(comm_fd);
  84         test_raw_tp_test_run__destroy(skel);
  85         free(online);
  86 }