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Linux/tools/perf/tests/bpf-script-example.c

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  1 /*
  2  * bpf-script-example.c
  3  * Test basic LLVM building
  4  */
  5 #ifndef LINUX_VERSION_CODE
  6 # error Need LINUX_VERSION_CODE
  7 # error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
  8 #endif
  9 #define BPF_ANY 0
 10 #define BPF_MAP_TYPE_ARRAY 2
 11 #define BPF_FUNC_map_lookup_elem 1
 12 #define BPF_FUNC_map_update_elem 2
 13 
 14 static void *(*bpf_map_lookup_elem)(void *map, void *key) =
 15         (void *) BPF_FUNC_map_lookup_elem;
 16 static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) =
 17         (void *) BPF_FUNC_map_update_elem;
 18 
 19 struct bpf_map_def {
 20         unsigned int type;
 21         unsigned int key_size;
 22         unsigned int value_size;
 23         unsigned int max_entries;
 24 };
 25 
 26 #define SEC(NAME) __attribute__((section(NAME), used))
 27 struct bpf_map_def SEC("maps") flip_table = {
 28         .type = BPF_MAP_TYPE_ARRAY,
 29         .key_size = sizeof(int),
 30         .value_size = sizeof(int),
 31         .max_entries = 1,
 32 };
 33 
 34 SEC("func=do_epoll_wait")
 35 int bpf_func__SyS_epoll_pwait(void *ctx)
 36 {
 37         int ind =0;
 38         int *flag = bpf_map_lookup_elem(&flip_table, &ind);
 39         int new_flag;
 40         if (!flag)
 41                 return 0;
 42         /* flip flag and store back */
 43         new_flag = !*flag;
 44         bpf_map_update_elem(&flip_table, &ind, &new_flag, BPF_ANY);
 45         return new_flag;
 46 }
 47 char _license[] SEC("license") = "GPL";
 48 int _version SEC("version") = LINUX_VERSION_CODE;
 49 

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