Bug 1854779

Summary:	[4.4] [sriov] The operator reset the PF MTU to 1500 when policy is deleted
Product:	OpenShift Container Platform	Reporter:	Peng Liu <pliu>
Component:	Networking	Assignee:	Peng Liu <pliu>
Networking sub component:	SR-IOV	QA Contact:	zhaozhanqi <zzhao>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	high
Priority:	unspecified	CC:	zzhao
Version:	4.4
Target Milestone:	---
Target Release:	4.4.z
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1854775	Environment:
Last Closed:	2020-08-04 14:16:01 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1854778
Bug Blocks:

Description Peng Liu 2020-07-08 08:45:29 UTC

+++ This bug was initially created as a clone of Bug #1854775 +++

Description of problem:
The operator always reset the PF MTU to 1500 when the policy is deleted

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Set the PF mtu to 5000. e.g. $ sudo ip link set dev ens803f0 mtu 5000

2. Deploy the sriov network operator 

3. Apply following policy
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-net-2
spec:
  resourceName: nic2
  nodeSelector:
    kubernetes.io/hostname: worker-0
    feature.node.kubernetes.io/network-sriov.capable: "true"
  priority: 99
  mtu: 9000
  numVfs: 4
  nicSelector:
    pfNames: ['ens803f0#0-0']
  isRdma: false

4. remove the policy

Actual results:
The MTU of ens803f0 was reset to 1500

Expected results:
The MTU of ens803f0 was reset to 5000

Additional info:

Comment 3 zhaozhanqi 2020-07-28 08:52:31 UTC

Verified this bug on v4.4.0.202007232108.p0-8

1. setup the cluster
2. set the MTU of one interface on node
   eg. ip link set dev ens1f0 mtu 9000
3. Setup the sriov operaotr
4. Create one policy with MTU is 9200
5. Check the MTU of VF and PF are changed to 9200
6. Delete the  policy
7. check the MTU of PF back to 9000.

Comment 5 errata-xmlrpc 2020-08-04 14:16:01 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 (OpenShift Container Platform 4.4.15 bug fix update), 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/RHBA-2020:3128