LXR linux/tools/testing/selftests/bpf/prog_tests/raw_tp_test

   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
   8static int duration;
   9
  10void test_raw_tp_test_run(void)
  11{
  12        struct bpf_prog_test_run_attr test_attr = {};
  13        int comm_fd = -1, err, nr_online, i, prog_fd;
  14        __u64 args[2] = {0x1234ULL, 0x5678ULL};
  15        int expected_retval = 0x1234 + 0x5678;
  16        struct test_raw_tp_test_run *skel;
  17        char buf[] = "new_name";
  18        bool *online = NULL;
  19        DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
  20                            .ctx_in = args,
  21                            .ctx_size_in = sizeof(args),
  22                            .flags = BPF_F_TEST_RUN_ON_CPU,
  23                );
  24
  25        err = parse_cpu_mask_file("/sys/devices/system/cpu/online", &online,
  26                                  &nr_online);
  27        if (CHECK(err, "parse_cpu_mask_file", "err %d\n", err))
  28                return;
  29
  30        skel = test_raw_tp_test_run__open_and_load();
  31        if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
  32                goto cleanup;
  33
  34        err = test_raw_tp_test_run__attach(skel);
  35        if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
  36                goto cleanup;
  37
  38        comm_fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
  39        if (CHECK(comm_fd < 0, "open /proc/self/comm", "err %d\n", errno))
  40                goto cleanup;
  41
  42        err = write(comm_fd, buf, sizeof(buf));
  43        CHECK(err < 0, "task rename", "err %d", errno);
  44
  45        CHECK(skel->bss->count == 0, "check_count", "didn't increase\n");
  46        CHECK(skel->data->on_cpu != 0xffffffff, "check_on_cpu", "got wrong value\n");
  47
  48        prog_fd = bpf_program__fd(skel->progs.rename);
  49        test_attr.prog_fd = prog_fd;
  50        test_attr.ctx_in = args;
  51        test_attr.ctx_size_in = sizeof(__u64);
  52
  53        err = bpf_prog_test_run_xattr(&test_attr);
  54        CHECK(err == 0, "test_run", "should fail for too small ctx\n");
  55
  56        test_attr.ctx_size_in = sizeof(args);
  57        err = bpf_prog_test_run_xattr(&test_attr);
  58        CHECK(err < 0, "test_run", "err %d\n", errno);
  59        CHECK(test_attr.retval != expected_retval, "check_retval",
  60              "expect 0x%x, got 0x%x\n", expected_retval, test_attr.retval);
  61
  62        for (i = 0; i < nr_online; i++) {
  63                if (!online[i])
  64                        continue;
  65
  66                opts.cpu = i;
  67                opts.retval = 0;
  68                err = bpf_prog_test_run_opts(prog_fd, &opts);
  69                CHECK(err < 0, "test_run_opts", "err %d\n", errno);
  70                CHECK(skel->data->on_cpu != i, "check_on_cpu",
  71                      "expect %d got %d\n", i, skel->data->on_cpu);
  72                CHECK(opts.retval != expected_retval,
  73                      "check_retval", "expect 0x%x, got 0x%x\n",
  74                      expected_retval, opts.retval);
  75        }
  76
  77        /* invalid cpu ID should fail with ENXIO */
  78        opts.cpu = 0xffffffff;
  79        err = bpf_prog_test_run_opts(prog_fd, &opts);
  80        CHECK(err >= 0 || errno != ENXIO,
  81              "test_run_opts_fail",
  82              "should failed with ENXIO\n");
  83
  84        /* non-zero cpu w/o BPF_F_TEST_RUN_ON_CPU should fail with EINVAL */
  85        opts.cpu = 1;
  86        opts.flags = 0;
  87        err = bpf_prog_test_run_opts(prog_fd, &opts);
  88        CHECK(err >= 0 || errno != EINVAL,
  89              "test_run_opts_fail",
  90              "should failed with EINVAL\n");
  91
  92cleanup:
  93        close(comm_fd);
  94        test_raw_tp_test_run__destroy(skel);
  95        free(online);
  96}
  97