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Bug 1557461

Summary:	tc: add support for the CBS qdisc
Product:	Red Hat Enterprise Linux 7	Reporter:	Ivan Vecera <ivecera>
Component:	iproute	Assignee:	Andrea Claudi <aclaudi>
Status:	CLOSED ERRATA	QA Contact:	Li Shuang <shuali>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.6	CC:	aclaudi, atragler, ivecera, jiji, rkhan, shuali
Target Milestone:	rc	Keywords:	Reopened
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	iproute-4.11.0-27.el7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1559942 (view as bug list)		Environment:
Last Closed:	2020-09-29 20:28:24 UTC	Type:	Bug
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:	1557250
Bug Blocks:

Description Ivan Vecera 2018-03-16 15:32:07 UTC

The bz#1557250 adds a support for CBS (Credit Based Shaper) qdisc to RHEL kernel and IGB driver update offers its offloading. To use this qdisc we need to update 'tc' command to understand a new syntax.

Commits:
c9681ac1 ("tc: Add support for the CBS qdisc", 2017-10-26)
d6529889 ("man: Add initial manpage for tc-cbs(8)", 2017-10-26)
1915af40 ("man: Clarify idleslope calculation for tc-cbs", 2017-11-10)

Comment 5 Andrea Claudi 2019-04-19 09:37:19 UTC

According to https://bugzilla.redhat.com/show_bug.cgi?id=1557250#c16, CBS is disabled on rhel7.6 as there is no request from customers for this.

From a quick look at conf files, I can confirm this on rhel7.7:
aclaudi@renaissance-vector:~/.../redhat/configs (rhel7)$ grep -rI CBS *
kernel-3.10.0-ppc64.config:# CONFIG_NET_SCH_CBS is not set
kernel-3.10.0-ppc64-debug.config:# CONFIG_NET_SCH_CBS is not set
kernel-3.10.0-ppc64le.config:# CONFIG_NET_SCH_CBS is not set
kernel-3.10.0-ppc64le-debug.config:# CONFIG_NET_SCH_CBS is not set
kernel-3.10.0-s390x.config:# CONFIG_NET_SCH_CBS is not set
kernel-3.10.0-s390x-debug.config:# CONFIG_NET_SCH_CBS is not set
kernel-3.10.0-x86_64.config:# CONFIG_NET_SCH_CBS is not set
kernel-3.10.0-x86_64-debug.config:# CONFIG_NET_SCH_CBS is not set

I'll close this as deferred, as this can change in the future. Feel free to reopen if needed.

Comment 6 Ivan Vecera 2019-04-23 14:22:17 UTC

(In reply to Andrea Claudi from comment #5)
> According to https://bugzilla.redhat.com/show_bug.cgi?id=1557250#c16, CBS is
> disabled on rhel7.6 as there is no request from customers for this.
> 
This is truth but for RHEL-7.6... The kernel config option is now enabled for RHEL-7.7 (https://bugzilla.redhat.com/show_bug.cgi?id=1642506) and is available in kernel-3.10.0-1040.el7 and newer.
Thus re-opening.

> From a quick look at conf files, I can confirm this on rhel7.7:
> aclaudi@renaissance-vector:~/.../redhat/configs (rhel7)$ grep -rI CBS *
> kernel-3.10.0-ppc64.config:# CONFIG_NET_SCH_CBS is not set
> kernel-3.10.0-ppc64-debug.config:# CONFIG_NET_SCH_CBS is not set
> kernel-3.10.0-ppc64le.config:# CONFIG_NET_SCH_CBS is not set
> kernel-3.10.0-ppc64le-debug.config:# CONFIG_NET_SCH_CBS is not set
> kernel-3.10.0-s390x.config:# CONFIG_NET_SCH_CBS is not set
> kernel-3.10.0-s390x-debug.config:# CONFIG_NET_SCH_CBS is not set
> kernel-3.10.0-x86_64.config:# CONFIG_NET_SCH_CBS is not set
> kernel-3.10.0-x86_64-debug.config:# CONFIG_NET_SCH_CBS is not set
> 
> I'll close this as deferred, as this can change in the future. Feel free to
> reopen if needed.

Comment 7 Andrea Claudi 2019-06-06 13:59:10 UTC

Moving this to RHEL-7.8.

Comment 8 Andrea Claudi 2019-12-05 18:08:29 UTC

Hi Ivan, is there a customer request for this?
If not, I am going to CLOSE/WONTFIX this, as this is fully supported by iproute in rhel-8.

Comment 9 Ivan Vecera 2019-12-06 06:52:48 UTC

(In reply to Andrea Claudi from comment #8)
> Hi Ivan, is there a customer request for this?
> If not, I am going to CLOSE/WONTFIX this, as this is fully supported by
> iproute in rhel-8.

The support for CBS (with offloading) was enabled in RHEL-7.7 by bz#1642506 and this feature was requested by HPE.

Comment 10 Andrea Claudi 2019-12-06 16:24:56 UTC

Thanks Ivan, moving to rhel-7.9.

Comment 19 errata-xmlrpc 2020-09-29 20:28:24 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 (iproute bug fix and enhancement 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-2020:3999