Re: [dpdk-users] mlx5 VF packet lost between rx_port_unicast_packets and rx_good_packets

[Asaf Penso <asafp@nvidia.com>]

Hello Yan,

Can you please mention which DPDK version you use and whether you see this issue also with latest upstream version?

Regards,
Asaf Penso

>-----Original Message-----
>From: users <users-bounces@dpdk.org> On Behalf Of Yan, Xiaoping (NSB -
>CN/Hangzhou)
>Sent: Monday, July 5, 2021 1:08 PM
>To: users@dpdk.org
>Subject: [dpdk-users] mlx5 VF packet lost between rx_port_unicast_packets
>and rx_good_packets
>
>Hi,
>
>When doing traffic loopback test on a mlx5 VF, we found there are some
>packet loss (not all packet received back ).
>
>From xstats counters, I found all packets have been received in
>rx_port_unicast_packets, but rx_good_packets has lower counter, and
>rx_port_unicast_packets - rx_good_packets = lost packets i.e. packet lost
>between rx_port_unicast_packets and rx_good_packets.
>But I can not find any other counter indicating where exactly those packets
>are lost.
>
>Any idea?
>
>Attached is the counter logs. (bf is before the test, af is after the test, fp-cli
>dpdk-port-stats is the command used to get xstats, and ethtool -S _f1 (the vf
>used) also printed) Test equipment reports that it sends: 2911176 packets,
>receives:  2909474, dropped: 1702 And the xstats (after - before) shows
>rx_port_unicast_packets 2911177,  rx_good_packets 2909475, so drop
>(2911177 - rx_good_packets) is 1702
>
>BTW, I also noticed this discussion "packet loss between phy and good
>counter"
>http://mails.dpdk.org/archives/users/2018-July/003271.html
>but my case seems to be different as packet also received in
>rx_port_unicast_packets, and I checked counter from pf  (ethtool -S ens1f0 in
>attached log), rx_discards_phy is not increasing.
>
>Thank you.
>
>Best regards
>Yan Xiaoping