The total time of test is useful to compare the performance
when bpf_jit_enable is 0 or 1, so print it in the summary.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
  lib/test_bpf.c | 27 +++++++++++++++++++++------
  1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 830a18e..b1b17ba 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c

@@ -8920,6 +8920,9 @@ static __init int test_skb_segment_single(const struct skb_segment_test *test)
  static __init int test_skb_segment(void)
  {
  	int i, err_cnt = 0, pass_cnt = 0;
+	u64 start, finish;
+
+	start = ktime_get_ns();
  
  	for (i = 0; i < ARRAY_SIZE(skb_segment_tests); i++) {
  		const struct skb_segment_test *test = &skb_segment_tests[i];

@@ -8935,8 +8938,10 @@ static __init int test_skb_segment(void)
  		}
  	}
  
-	pr_info("%s: Summary: %d PASSED, %d FAILED\n", __func__,
-		pass_cnt, err_cnt);
+	finish = ktime_get_ns();
+
+	pr_info("%s: Summary: %d PASSED, %d FAILED in %llu nsec\n",
+		__func__, pass_cnt, err_cnt, finish - start);
  	return err_cnt ? -EINVAL : 0;
  }