[v3,2/3] app/testpmd: fix burst percentage calculation

Message ID 20200706233231.25881-2-honnappa.nagarahalli@arm.com
State New
Headers show
Series
  • [v3,1/3] app/testpmd: clock gettime call in throughput calculation
Related show

Commit Message

Honnappa Nagarahalli July 6, 2020, 11:32 p.m.
The burst % calculation can over flow due to multiplication.
Fix the multiplication and increase the size of variables to
64b.

Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org

Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

Reviewed-by: Phil Yang <phil.yang@arm.com>

Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>

Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

Tested-by: Phil Yang <phil.yang@arm.com>

Tested-by: Ali Alnubani <alialnu@mellanox.com>

---
 app/test-pmd/testpmd.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

-- 
2.17.1

Patch

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 4989d22ca..2e1493da2 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -1692,9 +1692,9 @@  init_fwd_streams(void)
 static void
 pkt_burst_stats_display(const char *rx_tx, struct pkt_burst_stats *pbs)
 {
-	unsigned int total_burst;
-	unsigned int nb_burst;
-	unsigned int burst_stats[3];
+	uint64_t total_burst;
+	uint64_t nb_burst;
+	uint64_t burst_stats[3];
 	uint16_t pktnb_stats[3];
 	uint16_t nb_pkt;
 	int burst_percent[3];
@@ -1723,8 +1723,8 @@  pkt_burst_stats_display(const char *rx_tx, struct pkt_burst_stats *pbs)
 	}
 	if (total_burst == 0)
 		return;
-	burst_percent[0] = (burst_stats[0] * 100) / total_burst;
-	printf("  %s-bursts : %u [%d%% of %d pkts", rx_tx, total_burst,
+	burst_percent[0] = (double)burst_stats[0] / total_burst * 100;
+	printf("  %s-bursts : %"PRIu64" [%d%% of %d pkts", rx_tx, total_burst,
 	       burst_percent[0], (int) pktnb_stats[0]);
 	if (burst_stats[0] == total_burst) {
 		printf("]\n");
@@ -1735,7 +1735,7 @@  pkt_burst_stats_display(const char *rx_tx, struct pkt_burst_stats *pbs)
 		       100 - burst_percent[0], pktnb_stats[1]);
 		return;
 	}
-	burst_percent[1] = (burst_stats[1] * 100) / total_burst;
+	burst_percent[1] = (double)burst_stats[1] / total_burst * 100;
 	burst_percent[2] = 100 - (burst_percent[0] + burst_percent[1]);
 	if ((burst_percent[1] == 0) || (burst_percent[2] == 0)) {
 		printf(" + %d%% of others]\n", 100 - burst_percent[0]);