On 07/23/2012 08:03 AM, Don Dutile wrote:
On 07/20/2012 07:42 PM, Chris Friesen wrote:
I actually have a use-case where the guest needs to be able to modify
the MAC addresses of network devices that are actually VFs.
The guest is bonding the network devices together, so the bonding
driver in the guest expects to be able to set all the slaves to the
same MAC address.
As I read the ixgbe driver, this should be possible as long as the
host hasn't explicitly set the MAC address of the VF. Is that correct?
Chris
Interesting tug of war: hypervisors will want to set the macaddrs for
security reasons,
some guests may want to set macaddr for
(valid?) config reasons.
In our case we have control over both guest an host anyways, so it's
less of a security issue. In the general case though I could see it
being an interesting problem.
Back to the original discussion though--has anyone got any ideas about
the best way to trigger runtime creation of VFs? I don't know what the
binary APIs looks like, but via sysfs I could see something like
echo number_of_new_vfs_to_create >
/sys/bus/pci/devices/<address>/create_vfs
Something else that occurred to me--is there buy-in from driver
maintainers? I know the Intel ethernet drivers (what I'm most familiar
with) would need to be substantially modified to support on-the-fly
addition of new vfs. Currently they assume that the number of vfs is
known at module init time.
Chris
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