[dpdk-dev] [Bug 541] [dpdk-20.11] loopback_virtio_user_server_mode/Basic_test_for_packed_ring_server_mode: loopback throughput is zero

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=541

            Bug ID: 541
           Summary: [dpdk-20.11]
                    loopback_virtio_user_server_mode/Basic_test_for_packed
                    _ring_server_mode: loopback throughput is zero
           Product: DPDK
           Version: 20.11
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: vhost/virtio
          Assignee: dev at dpdk.org
          Reporter: yux.jiang at intel.com
  Target Milestone: ---

DPDK version: 
    DPDK commit: 46697431adcba206fd5222361bc73c5cf9042a86
    DPDK Comment: test/ring: enhance debug info in failure cases
    DPDK Version: 20.11.0-rc0 

OS: Ubuntu20.04.1 LTS (Focal Fossa)/5.4.0-47-generic
Compiler: gcc version 9.3.0
Hardware platform: Intel(R) Xeon(R) Platinum 8280M CPU @ 2.70GHz

Test Setup:
Steps to reproduce:
0, Build DPDK with meson & ninja
CC=gcc meson --werror -Denable_kmods=True  -Dlibdir=lib
-Dc_args='-DRTE_LIBRTE_PMD_PCAP=1' --default-library=static
x86_64-native-linuxapp-gcc
ninja -C x86_64-native-linuxapp-gcc -j 110


Test Case 1: Basic test for packed ring server mode
===================================================
1. Launch virtio-user as server mode::
    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-2 -n 4 --no-pci
--file-prefix=virtio \
   
--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=/tmp/sock0,server=1,queues=1,packed_vq=1
-- -i --rxq=1 --txq=1 --no-numa
    >set fwd mac
    >start

2. Launch vhost as client mode::
    ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 3-4 -n 4 --no-pci
--file-prefix=vhost \
    --vdev 'net_vhost0,iface=/tmp/sock0,client=1,queues=1' -- -i --rxq=1
--txq=1 --nb-cores=1
    >set fwd mac
    >start tx_first 32

3. Run below command to get throughput,verify the loopback throughput is not
zero::
    testpmd>show port stats all

Show the output from the previous commands:
      dut.10.240.183.214_vhost: show port stats all
      dut.10.240.183.214_vhost:

  ######################## NIC statistics for port 0  ########################
  RX-packets: 0          RX-missed: 0          RX-bytes:  0
  RX-errors: 0
  RX-nombuf:  0
  TX-packets: 0          TX-errors: 0          TX-bytes:  0

  Throughput (since last show)
  Rx-pps:            0          Rx-bps:            0
  Tx-pps:            0          Tx-bps:            0
  ############################################################################


[Expected result]
lookback throughput should not be zero.

[Bad commit] 
commit 57912824615fd7787a48a7b18e406614664b73f1 (HEAD -> 579128246)
Author: Maxime Coquelin <maxime.coquelin at redhat.com>
Date:   Wed Aug 5 16:45:15 2020 +0200

    net/virtio-user: support vhost status setting

    This patch adds support for VHOST_USER_SET_STATUS
    request. It is used to make the backend aware of
    Virtio devices status update.

    It is useful for the backend to know when the Virtio
    driver is done with the Virtio device configuration.

    Reviewed-by: Chenbo Xia <chenbo.xia at intel.com>
    Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
    Signed-off-by: Adrian Moreno <amorenoz at redhat.com>

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