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PCI/IOV: Allow PF drivers to limit total_VFs to 0
Some SR-IOV PF drivers implement .sriov_configure(), which allows
user-space to enable VFs by writing the desired number of VFs to the sysfs
"sriov_numvfs" file (see sriov_numvfs_store()).
The PCI core limits the number of VFs to the TotalVFs advertised by the
device in its SR-IOV capability. The PF driver can limit the number of VFs
to even fewer (it may have pre-allocated data structures or knowledge of
device limitations) by calling pci_sriov_set_totalvfs(), but previously it
could not limit the VFs to 0.
Change pci_sriov_get_totalvfs() so it always respects the VF limit imposed
by the PF driver, even if the limit is 0.
This sequence:
pci_sriov_set_totalvfs(dev, 0);
x = pci_sriov_get_totalvfs(dev);
previously set "x" to TotalVFs from the SR-IOV capability. Now it will set
"x" to 0.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
[bhelgaas: split to separate patch]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>