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The network driver now looks for the vlan element in network and portgroup objects, and logs an error at network define time if a vlan is requested for a network type that doesn't support it. (Currently vlan configuration is only supported for openvswitch networks, and networks used to do hostdev assignment of SR-IOV VFs.) At runtime, the three potential sources of vlan information are examined in this order: interface, chosen portgroup, network, and the first that is non-empty is used. Another check for valid network type is made at this time, since the interface may have requested a vlan (a legal thing to have in the interface config, since it's not known until runtime if the chosen network will actually support it). Since we must also check for domains requesting vlans for unsupported connection types even if they are type='network', and since networkAllocateActualDevice() is being called in exactly the correct places, and has all of the necessary information to check, I slightly modified the logic of that function so that interfaces that aren't type='network' don't just return immediately. Instead, they also perform all the same validation for supported features. Because of this, it's not necessary to make this identical check in the other three places that would normally require it: 1) qemu domain startup, 2) qemu device hotplug, 3) lxc domain startup. This can be seen as a first step in consolidating network-related functionality into the network driver, rather than having copies of the same code spread around in multiple places; this will make it easier to split the network parts off into a separate daemon, as we've discussed recently.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>