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     PCI_IOV_ADD_VF — inform a PF driver that a VF is being created


     #include <sys/bus.h>
     #include <machine/stdarg.h>
     #include <sys/nv.h>
     #include <dev/pci/pci_iov.h>

     PCI_IOV_ADD_VF(device_t dev, uint16_t vfnum, const nvlist_t *vf_config);


     The PCI_IOV_ADD_VF() method is called by the PCI Single-Root I/O Virtualization (SR-IOV)
     infrastructure when it is initializating a new Virtual Function (VF) as a child of the given
     Physical Function (PF) device.  This method will not be called until a successful call to
     PCI_IOV_INIT(9) has been made.  It is not guaranteed that this method will be called
     following a successful call to PCI_IOV_INIT(9).  If the infrastructure encounters a failure
     to allocate resources following the call to PCI_IOV_INIT(9), the VF creation will be aborted
     and PCI_IOV_UNINIT(9) will be called immediately without any preceding calls to

     The index of the VF being initialized is passed in the vfnum argument.  VFs are always
     numbered sequentially starting at 0.

     If the driver requested device-specific configuration parameters via a VF schema in its call
     to pci_iov_attach(9), those parameters will be contained in the vf_config argument.  All
     configuration parameters that were either set as required parameters or that had a default
     value set in the VF schema are guaranteed to be present in vf_config.  Configuration
     parameters that were neither set as required nor were given a default value are optional and
     may or may not be present in vf_config.  vf_config will not contain any configuration
     parameters that were not specified in the VF schema.  All configuration parameters will have
     the correct type and will be in the range of valid values specified in the schema.

     Note that it is possible for the user to set different configuration values on different VF
     devices that are children of the same PF.  The PF driver must not cache configuration
     parameters passed in previous calls to PCI_IOV_ADD_VF() for other VFs and apply those
     parameters to the current VF.

     This function will not be called twice for the same vf_num on the same PF device without
     PCI_IOV_UNINIT(9) and PCI_IOV_INIT(9) first being called, in that order.


     This method returns 0 on success, otherwise an appropriate error is returned.  If this
     method returns an error then the current VF device will be destroyed but the rest of the VF
     devices will be created and SR-IOV will be enabled on the PF.


     nv(9), pci(9), PCI_IOV_INIT(9), pci_iov_schema(9), PCI_IOV_UNINIT(9)


     This manual page was written by Ryan Stone <>.