VM boot with pci-passthrough interface failed to ping internal-net

[Peng Peng]

Brief Description
-----------------
Booting a vm with pci-passthrough vif model on internal net, then adding vlan to pci-passthrough interface for VM, then ping vm over mgmt and internal nets from base vm, but failed.

Severity
--------
Major

Steps to Reproduce
------------------
1. Get a network that supports pci-passthrough to boot vm
2. Create a flavor with dedicated cpu policy
3. Boot a base vm with above flavor and virtio nics
4. Create a flavor with specified extra-specs and dedicated cpu policy
5. Set extra-specs to the flavor
6. Boot a vm with pci-passthrough vif model on internal net
7. Add vlan to pci-passthrough interface for VM
8. Ping vm over mgmt and internal nets from base vm

Expected Behavior
------------------
Ping success

Actual Behavior
----------------
Ping failed

Reproducibility
---------------
100% Reproducible

System Configuration
--------------------
Storage system

Branch/Pull Time/Commit
-----------------------
master as of 2018-08-30_20-18-00

Timestamp/Logs
--------------
[2018-08-31 10:49:23,632] 264 DEBUG MainThread ssh.send :: Send 'ping -c 5 10.10.2.134'
[2018-08-31 10:49:37,737] 391 DEBUG MainThread ssh.expect :: Output:
PING 10.10.2.134 (10.10.2.134) 56(84) bytes of data.

--- 10.10.2.134 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 3999ms

]0;root@tenant2-pci-passthrough-8:~tenant2-pci-passthrough-8:~#
[2018-08-31 10:49:37,737] 264 DEBUG MainThread ssh.send :: Send 'echo $?'
[2018-08-31 10:49:37,840] 391 DEBUG MainThread ssh.expect :: Output:
1
]0;root@tenant2-pci-passthrough-8:~tenant2-pci-passthrough-8:~#
[2018-08-31 10:49:37,840] 2631 INFO MainThread network_helper.ping_server:: retry in 3 seconds
[2018-08-31 10:49:40,843] 2638 WARNING MainThread network_helper.ping_server:: Ping from 192.168.231.12 to 10.10.2.134 failed.

[2018-08-31 10:51:52,603] 264 DEBUG MainThread ssh.send :: Send 'ip addr'
......
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 3c:fd:fe:9c:8b:a9 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::3efd:feff:fe9c:8ba9/64 scope link
       valid_lft forever preferred_lft forever
4: eth1.2705@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
    link/ether 3c:fd:fe:9c:8b:a9 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::3efd:feff:fe9c:8ba9/64 scope link
       valid_lft forever preferred_lft forever

[Ghada Khalil (gkhalil)]

Marked as gating for stx.2018.10 as it's expected that this should work in starlingx

[Ghada Khalil (gkhalil)]

This is a duplicate of https://bugs.launchpad.net/starlingx/+bug/1790191

[Ghada Khalil (gkhalil)]

Marking as Invalid; same as the duplicate bug report