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This function is only called in two places, and the ifindex, nltarget_kernel, and getPidFunc args are never used (and never will be). ifindex - we always know the name of the device, and never know the ifindex - if we really did need the ifindex we would have to get it from the name using virNetDevGetIndex(). In practice, we just send -1 to virNetDevSetVfConfig(), which doesn't bother to learn the real ifindex (you only need a name *or* an ifindex for the netlink command to succeed, not both). nltarget_kernel - messages to set the config of an SRIOV VF will always go to netlink in the kernel, not to another user process, so this arg is always true (there are other uses of netlink messages where the message might need to go to another user process, but never in the case of RTM_SETLINK for SRIOV). getPidFunc - this arg is only used if nltarget_kernel is false, and it never is. None of this has any functional effect, it just makes it easier to follow what's happening when virNetDevSetVfConfig() is called.
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>