Re: mlx5 VF packet lost between rx_port_unicast_packets and rx_good_packets

[Martin Weiser <martin.weiser@allegro-packets.com>]

Hi,

you may want to check the counter 'rx_prio0_buf_discard' with ethtool 
(which is not available in DPDK xstats as it seems that this counter is 
global for the card and not available per port).
I opened a ticket a while ago regarding this issue: 
https://bugs.dpdk.org/show_bug.cgi?id=749

Best regards,
Martin


Am 27.10.21 um 08:17 schrieb Yan, Xiaoping (NSB - CN/Hangzhou):
> Hi,
>
> I tried with dpdk 20.11-3 downloaded from https://fast.dpdk.org/rel/dpdk-20.11.3.tar.xz
> Problem still exist:
> 1. there is packet loss with 2mpps (small packet),
> 2. no counter for the dropped packet in NIC.
>
> traffic generator stats: sends 41990938, receives back 41986105, lost 4833
> testpmd fwd stats: RX-packets: 41986110, TX-packets: 41986110
> port xstats: rx_unicast_packets: 41990938  (all packets reached to the NIC port), rx_good_packets: 41986111 (some is lost), but there is not any counter of the lost packet.
>
> Here is the log:
> [root@up-0 /]# dpdk-testpmd -l "2,3" --legacy-mem --socket-mem "5000,0" -a 0000:03:06.7  -- -i --nb-cores=1 --portmask=0x1 --rxd=512 --txd=512
> EAL: Detected 28 lcore(s)
> EAL: Detected 2 NUMA nodes
> EAL: Detected static linkage of DPDK
> EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
> EAL: Selected IOVA mode 'VA'
> EAL: No available hugepages reported in hugepages-2048kB
> EAL: Probing VFIO support...
> EAL: Probe PCI driver: mlx5_pci (15b3:1018) device: 0000:03:06.7 (socket 0)
> mlx5_pci: cannot bind mlx5 socket: Read-only file system
> mlx5_pci: Cannot initialize socket: Read-only file system
> EAL: No legacy callbacks, legacy socket not created
> Interactive-mode selected
> testpmd: create a new mbuf pool <mb_pool_0>: n=155456, size=2176, socket=0
> testpmd: preferred mempool ops selected: ring_mp_mc
>
> Warning! port-topology=paired and odd forward ports number, the last port will pair with itself.
>
> Configuring Port 0 (socket 0)
> Port 0: 7A:9A:8A:A6:86:93
> Checking link statuses...
> Done
> testpmd> port stop 0
> Stopping ports...
> Checking link statuses...
> Done
> testpmd> vlan set filter on 0
> testpmd> rx_vlan add 767 0
> testpmd> port start 0
> Port 0: 7A:9A:8A:A6:86:93
> Checking link statuses...
> Done
> testpmd> set fwd 5tswap
> Set 5tswap packet forwarding mode
> testpmd> start
> 5tswap packet forwarding - ports=1 - cores=1 - streams=1 - NUMA support enabled, MP allocation mode: native
> Logical Core 3 (socket 0) forwards packets on 1 streams:
>    RX P=0/Q=0 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00
>
>    5tswap packet forwarding packets/burst=32
>    nb forwarding cores=1 - nb forwarding ports=1
>    port 0: RX queue number: 1 Tx queue number: 1
>      Rx offloads=0x200 Tx offloads=0x0
>      RX queue: 0
>        RX desc=512 - RX free threshold=64
>        RX threshold registers: pthresh=0 hthresh=0  wthresh=0
>        RX Offloads=0x200
>      TX queue: 0
>        TX desc=512 - TX free threshold=0
>        TX threshold registers: pthresh=0 hthresh=0  wthresh=0
>        TX offloads=0x0 - TX RS bit threshold=0
>
> testpmd> show fwd stats all
>
>    ---------------------- Forward statistics for port 0  ----------------------
>    RX-packets: 41986110       RX-dropped: 0             RX-total: 41986110
>    TX-packets: 41986110       TX-dropped: 0             TX-total: 41986110
>    ----------------------------------------------------------------------------
>
> testpmd> show port xstats 0
> ###### NIC extended statistics for port 0
> rx_good_packets: 41986111
> tx_good_packets: 41986111
> rx_good_bytes: 3106973594
> tx_good_bytes: 3106973594
> rx_missed_errors: 0
> rx_errors: 0
> tx_errors: 0
> rx_mbuf_allocation_errors: 0
> rx_q0_packets: 41986111
> rx_q0_bytes: 3106973594
> rx_q0_errors: 0
> tx_q0_packets: 41986111
> tx_q0_bytes: 3106973594
> rx_wqe_errors: 0
> rx_unicast_packets: 41990938
> rx_unicast_bytes: 3107329412
> tx_unicast_packets: 41986111
> tx_unicast_bytes: 3106973594
> rx_multicast_packets: 1
> rx_multicast_bytes: 114
> tx_multicast_packets: 0
> tx_multicast_bytes: 0
> rx_broadcast_packets: 5
> rx_broadcast_bytes: 1710
> tx_broadcast_packets: 0
> tx_broadcast_bytes: 0
> tx_phy_packets: 0
> rx_phy_packets: 0
> rx_phy_crc_errors: 0
> tx_phy_bytes: 0
> rx_phy_bytes: 0
> rx_phy_in_range_len_errors: 0
> rx_phy_symbol_errors: 0
> rx_phy_discard_packets: 0
> tx_phy_discard_packets: 0
> tx_phy_errors: 0
> rx_out_of_buffer: 0
> tx_pp_missed_interrupt_errors: 0
> tx_pp_rearm_queue_errors: 0
> tx_pp_clock_queue_errors: 0
> tx_pp_timestamp_past_errors: 0
> tx_pp_timestamp_future_errors: 0
> tx_pp_jitter: 0
> tx_pp_wander: 0
> tx_pp_sync_lost: 0
> testpmd> q
> Command not found
> testpmd> exit
> Command not found
> testpmd> quit
> Telling cores to stop...
> Waiting for lcores to finish...
>
>    ---------------------- Forward statistics for port 0  ----------------------
>    RX-packets: 41986112       RX-dropped: 0             RX-total: 41986112
>    TX-packets: 41986112       TX-dropped: 0             TX-total: 41986112
>    ----------------------------------------------------------------------------
>
> Best regards
> Yan Xiaoping
>
> -----Original Message-----
> From: David Marchand <david.marchand@redhat.com>
> Sent: 2021年10月18日 18:45
> To: Yan, Xiaoping (NSB - CN/Hangzhou) <xiaoping.yan@nokia-sbell.com>
> Cc: Asaf Penso <asafp@nvidia.com>; users@dpdk.org; Slava Ovsiienko <viacheslavo@nvidia.com>; Matan Azrad <matan@nvidia.com>; Raslan Darawsheh <rasland@nvidia.com>
> Subject: Re: mlx5 VF packet lost between rx_port_unicast_packets and rx_good_packets
>
> On Mon, Oct 18, 2021 at 11:28 AM Yan, Xiaoping (NSB - CN/Hangzhou) <xiaoping.yan@nokia-sbell.com> wrote:
>> I have cloned dpdk code from github
>>
>> [xiaopiya@fedora30 dpdk]$ git remote -v origin
>> https://github.com/DPDK/dpdk.git (fetch) origin
>> https://github.com/DPDK/dpdk.git (push)
>>
>> which tag should I use?
>>
>> Or do I have to download 20.11.3 from git.dpdk.org?
>>
>> Sorry, I don’t know the relation between https://github.com/DPDK and  git.dpdk.org?
> Github DPDK/dpdk repo is a replication of the main repo hosted on dpdk.org servers.
>
> The official git repos and releases tarballs are on dpdk.org servers.
> The list of official releases tarballs is at: http://core.dpdk.org/download/ The main repo git is at: https://git.dpdk.org/dpdk/ The LTS/stable releases repo git is at: https://git.dpdk.org/dpdk-stable/
>
>
> --
> David Marchand
>