diff mbox series

[v6,5/5] examples/kni: improve zeroing statistics

Message ID 20181024202719.24902-6-dg@adax.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers
Series kni: add API to set link status on kernel interface |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK

Commit Message

Dan Gora Oct. 24, 2018, 8:27 p.m. UTC 
  The worker threads incrementing the rx/tx_packets race with the signal
handler from the main thread zeroing the entire statistics structure.
This can cause the statistics to fail to be zeroed, even when there
is no traffic on those interfaces.

Improve zeroing the statistics by only incrementing rx/tx_packets
in worker threads by a non-zero amount.  This limits the race to the
periods in which traffic is actually being received or transmitted.

Signed-off-by: Dan Gora <dg@adax.com>
---
 examples/kni/main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/examples/kni/main.c b/examples/kni/main.c
index 0e3b2a2f7..e37b1ad36 100644
--- a/examples/kni/main.c
+++ b/examples/kni/main.c
@@ -223,7 +223,8 @@  kni_ingress(struct kni_port_params *p)
 		}
 		/* Burst tx to kni */
 		num = rte_kni_tx_burst(p->kni[i], pkts_burst, nb_rx);
-		kni_stats[port_id].rx_packets += num;
+		if (num)
+			kni_stats[port_id].rx_packets += num;
 
 		rte_kni_handle_request(p->kni[i]);
 		if (unlikely(num < nb_rx)) {
@@ -260,7 +261,8 @@  kni_egress(struct kni_port_params *p)
 		}
 		/* Burst tx to eth */
 		nb_tx = rte_eth_tx_burst(port_id, 0, pkts_burst, (uint16_t)num);
-		kni_stats[port_id].tx_packets += nb_tx;
+		if (nb_tx)
+			kni_stats[port_id].tx_packets += nb_tx;
 		if (unlikely(nb_tx < num)) {
 			/* Free mbufs not tx to NIC */
 			kni_burst_free_mbufs(&pkts_burst[nb_tx], num - nb_tx);