Bug 694417

Summary:	[SR-IOV] Can not generate virtual functions using 82576 2 ports NIC card
Product:	Red Hat Enterprise Linux 5	Reporter:	koka xiong <kxiong>
Component:	libvirt	Assignee:	Libvirt Maintainers <libvirt-maint>
Status:	CLOSED WORKSFORME	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	high
Version:	5.7	CC:	dyuan, eblake, kxiong, llim, vbian, yimwang
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-04-12 04:57:32 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description koka xiong 2011-04-07 10:06:14 UTC

Description of problem:
I want to test SR-IOV with a 82576 NIC card. But, unfortunately failed to
generate virtual functions.
The install tree of my host:
http://download.englab.nay.redhat.com/pub/rhel/nightly/RHEL5.7-Server-20110330.1.n/tree-x86_64/

Version-Release number of selected component (if applicable):
kvm-83-229.el5
libvirt-0.8.2-18.el5
kernel-2.6.18-252.el5


How reproducible:
100%


Steps to Reproduce:
1.Enable VT-d and VT-x in an Intel host and make sure there is a 82576 NIC card
available.
2.Issue command in the terminal: #rmmod igb, modprobe igb max_vfs=1
3.#lspci | grep 82576

Actual results:
No virtual function generated.

Expected results:
Can generate virtual function.


Additional info:
It is supported on RHEL5.6 before,but when I now test this on the nightly build 5.7,the VF can't be generated now.

Comment 1 dyuan 2011-04-08 11:01:14 UTC

Could you please paste the related log in /var/log/messages and then check it with the kernel version in 5.6 release os tree ?

Comment 2 wangyimiao 2011-04-12 04:57:32 UTC

After reinstall that tree and can not reproduce that problem.

Version-Release number of selected component :
kvm-83-229.el5
libvirt-0.8.2-18.el5
kernel-2.6.18-252.el5