On Thu, Oct 24, 2013 at 09:52:31AM +0300, Niilona wrote:
Hi.
As Bjorn Helgaas recommend, this might be the item to discuss in the wider area. -----------------------------------
There is a behavior effecting virtfn -entries in sysfs, when amount of them increases over 10. Run VM's through LIBVIRT -> QEMU/KVM, this causes : - MAC address setting by LIBVIRT disordered ie. setting targeted to wrong VF. - VLAN setting by LIBVIRT overall failed
Basics of this are in "/libvirt-x.x.x/src/util/virpci.c" ; in function below, which don't order virtfn entries correctly.
/* * Returns virtual functions of a physical function */ int virPCIGetVirtualFunctions(const char *sysfs_path, virPCIDeviceAddressPtr **virtual_functions, unsigned int *num_virtual_functions) {
But I let you to decide which is best way to fix this, as if every application reads "virtfn" entries from PF's directory, they all need to sort entries in alphabet. order to avoid this influence. So personally I did get over this by adding pre-zeroes to names to have them in sorted order in PF's directory.
Libvirt has to work correctly with all existing released kernels, so we have to fix libvirt to deal with ordering correctly. Thus changing the kernel naming here doesn't really help. We need to fix libvirt to deal with this. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|