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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2019 Facebook */
   3 #include <test_progs.h>
   4
   5 /* x86-64 fits 55 JITed and 43 interpreted progs into half page */
   6 #define CNT 40
   7
   8 void test_fexit_stress(void)
   9 {
  10         char test_skb[128] = {};
  11         int fexit_fd[CNT] = {};
  12         int link_fd[CNT] = {};
  13         __u32 duration = 0;
  14         char error[4096];
  15         __u32 prog_ret;
  16         int err, i, filter_fd;
  17
  18         const struct bpf_insn trace_program[] = {
  19                 BPF_MOV64_IMM(BPF_REG_0, 0),
  20                 BPF_EXIT_INSN(),
  21         };
  22
  23         struct bpf_load_program_attr load_attr = {
  24                 .prog_type = BPF_PROG_TYPE_TRACING,
  25                 .license = "GPL",
  26                 .insns = trace_program,
  27                 .insns_cnt = sizeof(trace_program) / sizeof(struct bpf_insn),
  28                 .expected_attach_type = BPF_TRACE_FEXIT,
  29         };
  30
  31         const struct bpf_insn skb_program[] = {
  32                 BPF_MOV64_IMM(BPF_REG_0, 0),
  33                 BPF_EXIT_INSN(),
  34         };
  35
  36         struct bpf_load_program_attr skb_load_attr = {
  37                 .prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
  38                 .license = "GPL",
  39                 .insns = skb_program,
  40                 .insns_cnt = sizeof(skb_program) / sizeof(struct bpf_insn),
  41         };
  42
  43         err = libbpf_find_vmlinux_btf_id("bpf_fentry_test1",
  44                                          load_attr.expected_attach_type);
  45         if (CHECK(err <= 0, "find_vmlinux_btf_id", "failed: %d\n", err))
  46                 goto out;
  47         load_attr.attach_btf_id = err;
  48
  49         for (i = 0; i < CNT; i++) {
  50                 fexit_fd[i] = bpf_load_program_xattr(&load_attr, error, sizeof(error));
  51                 if (CHECK(fexit_fd[i] < 0, "fexit loaded",
  52                           "failed: %d errno %d\n", fexit_fd[i], errno))
  53                         goto out;
  54                 link_fd[i] = bpf_raw_tracepoint_open(NULL, fexit_fd[i]);
  55                 if (CHECK(link_fd[i] < 0, "fexit attach failed",
  56                           "prog %d failed: %d err %d\n", i, link_fd[i], errno))
  57                         goto out;
  58         }
  59
  60         filter_fd = bpf_load_program_xattr(&skb_load_attr, error, sizeof(error));
  61         if (CHECK(filter_fd < 0, "test_program_loaded", "failed: %d errno %d\n",
  62                   filter_fd, errno))
  63                 goto out;
  64
  65         err = bpf_prog_test_run(filter_fd, 1, test_skb, sizeof(test_skb), 0,
  66                                 0, &prog_ret, 0);
  67         close(filter_fd);
  68         CHECK_FAIL(err);
  69 out:
  70         for (i = 0; i < CNT; i++) {
  71                 if (link_fd[i])
  72                         close(link_fd[i]);
  73                 if (fexit_fd[i])
  74                         close(fexit_fd[i]);
  75         }
  76 }