Bug 2318545

Summary:	Fix description of OVNEmitNeedToFrag in official docs
Product:	Red Hat OpenStack	Reporter:	Ihar Hrachyshka <ihrachys>
Component:	documentation	Assignee:	James Smith <jamsmith>
Status:	CLOSED CURRENTRELEASE	QA Contact:	RHOS Documentation Team <rhos-docs>
Severity:	low	Docs Contact:
Priority:	high
Version:	17.1 (Wallaby)	CC:	mariel
Target Milestone:	z4	Keywords:	Triaged
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2025-01-13 18:03:59 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:

Description Ihar Hrachyshka 2024-10-14 14:20:47 UTC

This bug was initially created as a copy of Bug #2314429

I am copying this bug because: 

The official docs: https://docs.redhat.com/en/documentation/red_hat_openstack_platform/17.1/html-single/overcloud_parameters/index#ref_networking-neutron-parameters_overcloud_parameters claim the following about OVNEmitNeedToFrag flag:

"""
 Configure OVN to emit "need to frag" packets in case of MTU mismatch. Before enabling this configuration make sure that it’s supported by the host kernel (version >= 5.2) or by checking the output of the following command ovs-appctl -t ovs-vswitchd dpif/show-dp-features br-int | grep "Check pkt length action". The default value is false
"""

This is incorrect for RHEL, since it backports features to older 4.x kernel versions. The feature in question was backported to 4.x branch, so this comment is invalid. It was probably extracted from the upstream description for the option, but it is confusing to keep it for product docs.