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

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3 #include <linux/btf.h>
   4 #include "netif_receive_skb.skel.h"
   5
   6 /* Demonstrate that bpf_snprintf_btf succeeds and that various data types
   7  * are formatted correctly.
   8  */
   9 void test_snprintf_btf(void)
  10 {
  11         struct netif_receive_skb *skel;
  12         struct netif_receive_skb__bss *bss;
  13         int err, duration = 0;
  14
  15         skel = netif_receive_skb__open();
  16         if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
  17                 return;
  18
  19         err = netif_receive_skb__load(skel);
  20         if (CHECK(err, "skel_load", "failed to load skeleton: %d\n", err))
  21                 goto cleanup;
  22
  23         bss = skel->bss;
  24
  25         err = netif_receive_skb__attach(skel);
  26         if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
  27                 goto cleanup;
  28
  29         /* generate receive event */
  30         err = system("ping -c 1 127.0.0.1 > /dev/null");
  31         if (CHECK(err, "system", "ping failed: %d\n", err))
  32                 goto cleanup;
  33
  34         if (bss->skip) {
  35                 printf("%s:SKIP:no __builtin_btf_type_id\n", __func__);
  36                 test__skip();
  37                 goto cleanup;
  38         }
  39
  40         /*
  41          * Make sure netif_receive_skb program was triggered
  42          * and it set expected return values from bpf_trace_printk()s
  43          * and all tests ran.
  44          */
  45         if (CHECK(bss->ret <= 0,
  46                   "bpf_snprintf_btf: got return value",
  47                   "ret <= 0 %ld test %d\n", bss->ret, bss->ran_subtests))
  48                 goto cleanup;
  49
  50         if (CHECK(bss->ran_subtests == 0, "check if subtests ran",
  51                   "no subtests ran, did BPF program run?"))
  52                 goto cleanup;
  53
  54         if (CHECK(bss->num_subtests != bss->ran_subtests,
  55                   "check all subtests ran",
  56                   "only ran %d of %d tests\n", bss->num_subtests,
  57                   bss->ran_subtests))
  58                 goto cleanup;
  59
  60 cleanup:
  61         netif_receive_skb__destroy(skel);
  62 }