PCI_IOV_ADD_VF(9)      FreeBSD Kernel Developer's Manual     PCI_IOV_ADD_VF(9)

NAME
     PCI_IOV_ADD_VF - inform a PF driver that a VF is being created

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

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

DESCRIPTION
     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 PCI_IOV_ADD_VF.

     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.

RETURN VALUES
     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.

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

AUTHORS
     This manual page was written by Ryan Stone <rstone@FreeBSD.org>.

FreeBSD 13.1-RELEASE-p6          May 28, 2015          FreeBSD 13.1-RELEASE-p6