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From: Stephen Hemminger <stephen@networkplumber.org>
To: Flavia Musatescu <flavia.musatescu@intel.com>
Cc: dev@dpdk.org, "John W. Linville" <linville@tuxdriver.com>,
	stable@dpdk.org, ciwillia@brocade.com
Subject: Re: [dpdk-dev] [PATCH v2] net/af_packet: improve Tx statistics accuracy
Date: Thu, 10 Oct 2019 11:35:33 -0700
Message-ID: <20191010113533.43333afe@hermes.lan> (raw)
In-Reply-To: <1570728870-26668-1-git-send-email-flavia.musatescu@intel.com>

On Thu, 10 Oct 2019 18:34:30 +0100
Flavia Musatescu <flavia.musatescu@intel.com> wrote:

> When sendto call fails and ENOBUFS 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
> ---
>  drivers/net/af_packet/rte_eth_af_packet.c | 8 ++++++--
>  1 file changed, 6 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..df281bf 100644
> --- a/drivers/net/af_packet/rte_eth_af_packet.c
> +++ b/drivers/net/af_packet/rte_eth_af_packet.c
> @@ -244,8 +244,12 @@ 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) {
> +		/*
> +		 * In case of a ENOBUFS error all of the enqueued packets will
> +		 * be considered successful even though only some are sent.
> +		 */
>  		num_tx = 0;
>  		num_tx_bytes = 0;
>  	}

What about EINTR or EAGAIN?

  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 [this message]
2019-10-11 17:13     ` Musatescu, Flavia
2019-10-17 11:51   ` [dpdk-dev] [PATCH v3] " Flavia Musatescu
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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