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From: Flavia Musatescu <flavia.musatescu@intel.com>
To: dev@dpdk.org, "John W. Linville" <linville@tuxdriver.com>
Cc: stable@dpdk.org, Flavia Musatescu <flavia.musatescu@intel.com>,
	ciwillia@brocade.com
Subject: [dpdk-dev] [PATCH v3] net/af_packet: improve Tx statistics accuracy
Date: Thu, 17 Oct 2019 12:51:47 +0100
Message-ID: <1571313107-31794-1-git-send-email-flavia.musatescu@intel.com> (raw)
In-Reply-To: <1570728870-26668-1-git-send-email-flavia.musatescu@intel.com>

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.

Before:
   testpmd Tx statistics:
      TX-packets: 7529062   TX-errors: 3702150  TX-bytes:  451743720
   pktgen Rx statistics:
      Total Rx Pkts: 10700700

After:
   testpmd TX statistics:
      TX-packets: 11510625  TX-errors: 0        TX-bytes:  690637500
   pktgen Rx statistics:
      Total Rx Pkts: 10974307

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

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

---
v2:
* Changed the comment.

v3:
* Same applied for EAGAIN error.
---
 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


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-09 15:29 [dpdk-dev] [PATCH] " Flavia Musatescu
2019-10-09 17:26 ` Stephen Hemminger
2019-10-10 17:34 ` [dpdk-dev] [PATCH v2] " Flavia Musatescu
2019-10-10 18:35   ` Stephen Hemminger
2019-10-11 17:13     ` Musatescu, Flavia
2019-10-17 11:51   ` Flavia Musatescu [this message]
2019-10-18 14:24     ` [dpdk-dev] [PATCH v4] " Flavia Musatescu
2019-10-18 15:15       ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2019-10-21 18:15         ` Ferruh Yigit

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