netdev - [PATCH net-next 4/4] bpf: add a test case for helper bpf_perf_prog_read

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Date:   Fri, 1 Sep 2017 09:53:57 -0700
From:   Yonghong Song <yhs@...com>
To:     <peterz@...radead.org>, <rostedt@...dmis.org>, <ast@...com>,
        <daniel@...earbox.net>, <netdev@...r.kernel.org>
CC:     <kernel-team@...com>
Subject: [PATCH net-next 4/4] bpf: add a test case for helper bpf_perf_prog_read_time

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@...com>
---
 samples/bpf/trace_event_kern.c            | 5 +++++
 tools/testing/selftests/bpf/bpf_helpers.h | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/samples/bpf/trace_event_kern.c b/samples/bpf/trace_event_kern.c
index 41b6115..f372660 100644
--- a/samples/bpf/trace_event_kern.c
+++ b/samples/bpf/trace_event_kern.c
@@ -37,8 +37,10 @@ struct bpf_map_def SEC("maps") stackmap = {
 SEC("perf_event")
 int bpf_prog1(struct bpf_perf_event_data *ctx)
 {
+	char time_fmt[] = "Time Enabled: %lld, Time Running: %lld";
 	char fmt[] = "CPU-%d period %lld ip %llx";
 	u32 cpu = bpf_get_smp_processor_id();
+	struct bpf_perf_time time_buf;
 	struct key_t key;
 	u64 *val, one = 1;
 
@@ -54,6 +56,9 @@ int bpf_prog1(struct bpf_perf_event_data *ctx)
 		return 0;
 	}
 
+	bpf_perf_prog_read_time(ctx, (void *)&time_buf, sizeof(struct bpf_perf_time));
+	bpf_trace_printk(time_fmt, sizeof(time_fmt), time_buf.enabled, time_buf.running);
+
 	val = bpf_map_lookup_elem(&counts, &key);
 	if (val)
 		(*val)++;
diff --git a/tools/testing/selftests/bpf/bpf_helpers.h b/tools/testing/selftests/bpf/bpf_helpers.h
index fe41852..ddad690 100644
--- a/tools/testing/selftests/bpf/bpf_helpers.h
+++ b/tools/testing/selftests/bpf/bpf_helpers.h
@@ -74,6 +74,9 @@ static int (*bpf_perf_read_counter_time)(void *map, unsigned long long flags,
 				       void *counter_time_buf,
 				       unsigned int buf_size) =
 	(void *) BPF_FUNC_perf_read_counter_time;
+static int (*bpf_perf_prog_read_time)(void *ctx, void *time_buf,
+				      unsigned int size) =
+	(void *) BPF_FUNC_perf_prog_read_time;
 
 
 /* llvm builtin functions that eBPF C program may use to
-- 
2.9.5