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

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 74508c63bd47..99b5f83d2468 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -411,7 +411,7 @@ static ssize_t sriov_totalvfs_show(struct device *dev,
 {
         struct pci_dev *pdev = to_pci_dev(dev);
 
-        return sprintf(buf, "%u\n", pdev->sriov->total);
+        return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
 }
 
 
@@ -452,7 +452,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,
         }
 
         /* if enabling vf's ... */
-        total = pdev->sriov->total;
+        total = pci_sriov_get_totalvfs(pdev);
         /* Requested VFs to enable < totalvfs and none enabled already */
         if ((num_vfs > 0) && (num_vfs <= total)) {
                 if (pdev->sriov->nr_virtfn == 0) {