[v4,6/6] examples/kni: improve zeroing statistics
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Message ID 20181017010412.23141-7-dg@adax.com
State Superseded, archived
Delegated to: Thomas Monjalon
Headers show
Series
  • kni: add API to set link status on kernel interface
Related show

Checks

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

Commit Message

Dan Gora Oct. 17, 2018, 1:04 a.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(-)

Patch
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diff --git a/examples/kni/main.c b/examples/kni/main.c
index 314e19c68..3ae4c13a2 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);