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bpf: add a test case for helper bpf_perf_prog_read_value

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The bpf sample program trace_event is enhanced to use the new
helper to print out enabled/running time.

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yonghong Song
2017-10-05 09:19:23 -07:00
committed by David S. Miller
parent 4bebdc7a85
commit 81b9cf8028
4 changed files with 23 additions and 6 deletions
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3
tools/testing/selftests/bpf/bpf_helpers.h
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@@ -75,6 +75,9 @@ static int (*bpf_sock_map_update)(void *map, void *key, void *value,
static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags,
void *buf, unsigned int buf_size) =
(void *) BPF_FUNC_perf_event_read_value;
static int (*bpf_perf_prog_read_value)(void *ctx, void *buf,
unsigned int buf_size) =
(void *) BPF_FUNC_perf_prog_read_value;
/* llvm builtin functions that eBPF C program may use to