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Bug 1628905 - systemctl reload openvswitch includes default flow.
Summary: systemctl reload openvswitch includes default flow.
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: openvswitch2.10
Version: 7.5
Hardware: x86_64
OS: Linux
high
high
Target Milestone: rc
: ---
Assignee: Timothy Redaelli
QA Contact: Rick Alongi
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-09-14 10:07 UTC by Timothy Redaelli
Modified: 2020-01-14 22:23 UTC (History)
9 users (show)

Fixed In Version: openvswitch2.10-2.10.0-5.el7fdp
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1626096
Environment:
Last Closed: 2018-09-20 20:13:35 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2018:2735 0 None None None 2018-09-20 20:14:18 UTC

Description Timothy Redaelli 2018-09-14 10:07:38 UTC 
+++ This bug was initially created as a clone of Bug #1626096 +++

Description of problem:
The flows should be restored when issuing a service reload, however the default flow is not removed when it starts and becomes part of the final flow table.

// installed version
# rpm -q openvswitch
openvswitch-2.9.0-56.el7fdp.x86_64

// adding an example of flow table
# ovs-ofctl del-flows ovsbr0 
# ovs-ofctl add-flow ovsbr0 'in_port=10 actions=output:20'
# ovs-ofctl add-flow ovsbr0 'in_port=20 actions=output:10'
# ovs-ofctl add-flow ovsbr0 'actions=drop'

// Dumping the flows
# ovs-ofctl dump-flows ovsbr0 
 cookie=0x0, duration=24.416s, table=0, n_packets=0, n_bytes=0, in_port=veth1 actions=output:veth2
 cookie=0x0, duration=18.466s, table=0, n_packets=0, n_bytes=0, in_port=veth2 actions=output:veth1
 cookie=0x0, duration=7.818s, table=0, n_packets=0, n_bytes=0, actions=drop

// Reload the service
# systemctl reload openvswitch 

// Dump the flow table again to check
[root@localhost ~]# ovs-ofctl dump-flows ovsbr0 
 cookie=0x0, duration=3.136s, table=0, n_packets=0, n_bytes=0, in_port=veth1 actions=output:veth2
 cookie=0x0, duration=3.136s, table=0, n_packets=0, n_bytes=0, in_port=veth2 actions=output:veth1
 cookie=0x0, duration=3.151s, table=0, n_packets=0, n_bytes=0, priority=0 actions=NORMAL
 cookie=0x0, duration=3.136s, table=0, n_packets=0, n_bytes=0, actions=drop


Notice the default 'actions=NORMAL' is added to the flow table.

Expected results:
The flow table is restored as it was before the reloading the service.

--- Additional comment from Timothy Redaelli on 2018-09-10 16:21:12 CEST ---

Patch sent on OVS mailing list: https://mail.openvswitch.org/pipermail/ovs-dev/2018-September/351970.html
Comment 4 Rick Alongi 2018-09-14 17:19:47 UTC 
Reproduced issue:

[root@netqe11 yum.repos.d]# rpm -q openvswitch
openvswitch-2.9.0-56.el7fdp.x86_64

systemctl start openvswitch

# add bridge and flows

ovs-vsctl --if-exists del-br obrbr0
ovs-vsctl add-br ovsbr0

ovs-ofctl del-flows ovsbr0 
ovs-ofctl add-flow ovsbr0 'in_port=10 actions=output:20'
ovs-ofctl add-flow ovsbr0 'in_port=20 actions=output:10'
ovs-ofctl add-flow ovsbr0 'actions=drop'

ovs-ofctl dump-flows ovsbr0

[root@netqe11 yum.repos.d]# ovs-ofctl dump-flows ovsbr0
 cookie=0x0, duration=28.241s, table=0, n_packets=0, n_bytes=0, in_port=10 actions=output:20
 cookie=0x0, duration=28.238s, table=0, n_packets=0, n_bytes=0, in_port=20 actions=output:10
 cookie=0x0, duration=28.235s, table=0, n_packets=0, n_bytes=0, actions=drop
 
 systemctl reload openvswitch
 
 # observe issue where NORMAL flow rule is added after systemctl reload openvswitch
 
 [root@netqe11 yum.repos.d]# ovs-ofctl dump-flows ovsbr0
 cookie=0x0, duration=5.715s, table=0, n_packets=0, n_bytes=0, in_port=10 actions=output:20
 cookie=0x0, duration=5.715s, table=0, n_packets=0, n_bytes=0, in_port=20 actions=output:10
 cookie=0x0, duration=5.731s, table=0, n_packets=0, n_bytes=0, priority=0 actions=NORMAL
 cookie=0x0, duration=5.715s, table=0, n_packets=0, n_bytes=0, actions=drop

# Upgrade to OVS 2.10 with fix

[root@netqe11 yum.repos.d]# rpm -q openvswitch2.10
openvswitch2.10-2.10.0-5.el7fdp.x86_64

systemctl start openvswitch

# Add flows

ovs-vsctl --if-exists del-br obrbr0
ovs-vsctl add-br ovsbr0

ovs-ofctl del-flows ovsbr0 
ovs-ofctl add-flow ovsbr0 'in_port=10 actions=output:20'
ovs-ofctl add-flow ovsbr0 'in_port=20 actions=output:10'
ovs-ofctl add-flow ovsbr0 'actions=drop'

[root@netqe11 yum.repos.d]# ovs-ofctl dump-flows ovsbr0
 cookie=0x0, duration=8.554s, table=0, n_packets=0, n_bytes=0, in_port=10 actions=output:20
 cookie=0x0, duration=8.548s, table=0, n_packets=0, n_bytes=0, in_port=20 actions=output:10
 cookie=0x0, duration=8.541s, table=0, n_packets=0, n_bytes=0, actions=drop
 
 [root@netqe11 yum.repos.d]# systemctl reload openvswitch
 
 # NORMAL flow rule is no longer added after systemctl reload openvswitch
 
 [root@netqe11 yum.repos.d]# ovs-ofctl dump-flows ovsbr0
 cookie=0x0, duration=8.366s, table=0, n_packets=0, n_bytes=0, in_port=10 actions=output:20
 cookie=0x0, duration=8.366s, table=0, n_packets=0, n_bytes=0, in_port=20 actions=output:10
 cookie=0x0, duration=8.366s, table=0, n_packets=0, n_bytes=0, actions=drop
 
 Marking as Verified.
Comment 6 errata-xmlrpc 2018-09-20 20:13:35 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:2735
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