On 12/2/22 7:43 AM, Gk Gk wrote:
Hi,
We have an openstack platform and we are trying to get the network
details of the guest vm on the hypervisors using the python libvirt
library (domain.interfaceStats) . But in cases of SR-IOV vms, the
interface is not being reported by the above tool. The interface in
this case is "hostdev" in the guest xml definition. Can anyone let me
know how to find out the sr-iov network interface details of the guest vm ?
Support for reporting stats of SRIOV VF-backed "hostdev" interfaces was
added with commit b295f06d, which first appeared in libvirt-6.9.0.
Because there is no named "netdev" type interface on the host side, you
need to use the MAC address of the interface when calling
virDomainInterfaceStats().
Unfortunately, the method used to get the stats for these interfaces
(see the commit log for details) isn't supported by all SRIOV netdev
drivers. The Intel 82559 I have uses the igb driver, which doesn't
support it, so all the stats show up as "0". Even the ixgbe driver
doesn't support it. According to the commit log if you have a
sufficiently new (but not *too* new!) Mellanox card, then you may be in
luck.
