Bug 2208568

Summary: Document that ovs flows with ct(alg) are not offloadable
Product: Red Hat OpenStack Reporter: Marcelo Ricardo Leitner <mleitner>
Component: documentationAssignee: Greg Rakauskas <gregraka>
Status: ASSIGNED --- QA Contact: RHOS Documentation Team <rhos-docs>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 17.1 (Wallaby)CC: echaudro, gregraka, gurpsing, hakhande, jamsmith, lsvaty
Target Milestone: ---Keywords: Triaged
Target Release: ---Flags: lsvaty: needinfo? (gregraka)
Hardware: Unspecified   
OS: Unspecified   
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2172622, 2203413    

Description Marcelo Ricardo Leitner 2023-05-19 15:10:28 UTC 
Description of problem:
In the past we had this bz:
https://bugzilla.redhat.com/show_bug.cgi?id=1816660
to document some NIC limitations.

And we have another one to document now. As summary says, ovs flows that use
the ct action with the alg parameter, they are never offloadable. As of OSP 17.1, they will be installed in dp:tc, but they won't be offloaded to the NIC.  There is no NIC that supports it and hardly there will be one.

FWIW, in OSP 16.2, such flows wouldn't even get to dp:tc. They will remain in dp:ovs, and cause a different set of issues. But in OSP 16.2 CT HWOL is TP and there's no need to go into these details in the docs.

FWIW^2, this was implemented in RHEL via this bz: https://bugzilla.redhat.com/show_bug.cgi?id=2106859

Version-Release number of selected component (if applicable):
17.1
Comment 1 Marcelo Ricardo Leitner 2023-05-19 18:33:35 UTC 
This bz goes hand in hand with https://bugzilla.redhat.com/show_bug.cgi?id=2203413