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PCI: Provide method to reduce the number of total VFs supported

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Some implementations of SRIOV provide a capability structure
value of TotalVFs that is greater than what the software can support.
Provide a method to reduce the capability structure reported value
to the value the driver can support.
This ensures sysfs reports the current capability of the system,
hardware and software.
Example for its use: igb & ixgbe -- report 8 & 64 as TotalVFs,
but drivers only support 7 & 63 maximum.

Signed-off-by: Donald Dutile <ddutile@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Donald Dutile
2012-11-05 15:20:37 -05:00
committed by Bjorn Helgaas
parent 1789382a72
commit bff73156d3
4 changed files with 60 additions and 2 deletions
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10
include/linux/pci.h
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@@ -1611,6 +1611,8 @@ extern int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
extern void pci_disable_sriov(struct pci_dev *dev);
extern irqreturn_t pci_sriov_migration(struct pci_dev *dev);
extern int pci_num_vf(struct pci_dev *dev);
extern int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs);
extern int pci_sriov_get_totalvfs(struct pci_dev *dev);
#else
static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
{
@@ -1627,6 +1629,14 @@ static inline int pci_num_vf(struct pci_dev *dev)
{
return 0;
}
static inline int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
{
return 0;
}
static inline int pci_sriov_get_totalvfs(struct pci_dev *dev)
{
return 0;
}
#endif
#if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)