Re: [libvirt-users] SR-IOV Pool Availability
On 09/20/2013 02:28 AM, Dax Kelson wrote:
I have an Intel X540 SR-IOV NIC in a box with ACS support running
RHEL6.4.
Hi Hongming, I'm hoping you can please help with two issues:
1. The pool works, but I transparent VLAN with the pool does not. I
have to manually run "ip" afterwards to get it to work.
# virsh net-dumpxml em2net
<network connections='1'>
<name>em2net</name>
<uuid>d5dabeb2-fa09-3edf-660a-db42d8cd3f4d</uuid>
<forward mode='hostdev' managed='yes'>
<pf dev='em2'/>
<snip giant list of VFs>
</forward>
</network>
# virsh dumpxml guestbox
---
<interface type='network'>
<mac address='52:54:00:c0:de:00'/>
<source network='em2net'/>
<vlan>
<tag id='17'/>
</vlan>
<alias name='hostdev0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x07'
function='0x0'/>
</interface>
---
The networking doesn't work until I run the following command on the host:
ip link set em2 vf 0 vlan 17
Then networking in the guest starts working and the following shows up
in dmesg on the host:
ixgbe 0000:01:00.1: Setting VLAN 17, QOS 0x0 on VF 0
This is a known bug in RHEL6.4, which will be fixed in RHEL6.5:
https://bugzilla.redhat.com/show_bug.cgi?id=999107
In the meantime, you should be able to work around the bug by adding the
same <vlan> element to each guest's <interface> (if that also doesn't
work, then you are also suffering from a bug caused by a change to the
kernel NETLINK ABI - in that case you should update kernel, libnl, and
libvirt packages (at least) to the latest 6.4 versions available.)
If the workaround isn't adequate for you, you should open a ticket with
Red Hat support to get the fix for that bug backported to RHEL6.4 libvirt.
2. I can only do a single SR-IOV NIC per guest. If I try to add
another NIC (or even PCI passthrough), I get "Duplicate ID 'hostdev0'
for device"
This is also a known bug in RHEL6.4:
https://bugzilla.redhat.com/show_bug.cgi?id=1001881
Again, if it is causing you problems please open a ticket with Red Hat
support so that the bug can be reprioritized.