tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2020 Facebook */
   3 #include <linux/error-injection.h>
   4 #include <linux/init.h>
   5 #include <linux/module.h>
   6 #include <linux/sysfs.h>
   7 #include <linux/tracepoint.h>
   8 #include "bpf_testmod.h"
   9
  10 #define CREATE_TRACE_POINTS
  11 #include "bpf_testmod-events.h"
  12
  13 noinline ssize_t
  14 bpf_testmod_test_read(struct file *file, struct kobject *kobj,
  15                       struct bin_attribute *bin_attr,
  16                       char *buf, loff_t off, size_t len)
  17 {
  18         struct bpf_testmod_test_read_ctx ctx = {
  19                 .buf = buf,
  20                 .off = off,
  21                 .len = len,
  22         };
  23
  24         trace_bpf_testmod_test_read(current, &ctx);
  25
  26         return -EIO; /* always fail */
  27 }
  28 EXPORT_SYMBOL(bpf_testmod_test_read);
  29 ALLOW_ERROR_INJECTION(bpf_testmod_test_read, ERRNO);
  30
  31 static struct bin_attribute bin_attr_bpf_testmod_file __ro_after_init = {
  32         .attr = { .name = "bpf_testmod", .mode = 0444, },
  33         .read = bpf_testmod_test_read,
  34 };
  35
  36 static int bpf_testmod_init(void)
  37 {
  38         return sysfs_create_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
  39 }
  40
  41 static void bpf_testmod_exit(void)
  42 {
  43         return sysfs_remove_bin_file(kernel_kobj, &bin_attr_bpf_testmod_file);
  44 }
  45
  46 module_init(bpf_testmod_init);
  47 module_exit(bpf_testmod_exit);
  48
  49 MODULE_AUTHOR("Andrii Nakryiko");
  50 MODULE_DESCRIPTION("BPF selftests module");
  51 MODULE_LICENSE("Dual BSD/GPL");
  52