[dpdk-stable] [PATCH v4] net/af_packet: improve Tx statistics accuracy

Flavia Musatescu flavia.musatescu at intel.com
Fri Oct 18 16:24:31 CEST 2019


When sendto call fails and ENOBUFS/EAGAIN error is being set
some of the packets are actually successfully transmitted.
There is no available count of those packets, so in order to
make the statistics more accurate, all the previously enqueued
packets will be considered successful, even though this is not
entirely correct.

Statistics numbers before this update:

Pktgen:
   Total Rx Pkts:               1360084
         Tx Pkts:               2000000
testpmd:
   RX-packets: 1408346  RX-missed: 0       RX-bytes:  84503418
   TX-packets: 526486   TX-errors: 881851  TX-bytes:  31589724

Statistics numbers after this update:

Pktgen:
   Total Rx Pkts:               1329872
         Tx Pkts:               2000000
testpmd:
   RX-packets: 1389156  RX-missed: 0       RX-bytes:  83349360
   TX-packets: 1389156  TX-errors: 0       TX-bytes:  83349360

Fixes: 74b7fc0a0ff1 ("net/af_packet: fix packet bytes counting")
Cc: ciwillia at brocade.com
Cc: stable at dpdk.org

Signed-off-by: Flavia Musatescu <flavia.musatescu at intel.com>

---
v2:
* Changed the comment.

v3:
* Same applied for EAGAIN error.

v4:
* Updated the statistics in the commit message
---
 drivers/net/af_packet/rte_eth_af_packet.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/af_packet/rte_eth_af_packet.c b/drivers/net/af_packet/rte_eth_af_packet.c
index 6df09f2..5592626 100644
--- a/drivers/net/af_packet/rte_eth_af_packet.c
+++ b/drivers/net/af_packet/rte_eth_af_packet.c
@@ -244,8 +244,14 @@ eth_af_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 	}
 
 	/* kick-off transmits */
-	if (sendto(pkt_q->sockfd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1) {
-		/* error sending -- no packets transmitted */
+	if (sendto(pkt_q->sockfd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1 &&
+			errno != ENOBUFS && errno != EAGAIN) {
+		/*
+		 * In case of a ENOBUFS/EAGAIN error all of the enqueued
+		 * packets will be considered successful even though only some
+		 * are sent.
+		 */
+
 		num_tx = 0;
 		num_tx_bytes = 0;
 	}
-- 
2.7.4



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