[PATCH v5 3/9] rust: pci: add is_virtfn(), to check for VFs

[Simon Song <xinmengs@nvidia.com>]

From: John Hubbard <jhubbard@nvidia.com>

Add a method to check if a PCI device is a Virtual Function (VF) created
through Single Root I/O Virtualization (SR-IOV).

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Peter Colberg <peter@colberg.org>
Signed-off-by: Zhi Wang <zhiw@nvidia.com>
Signed-off-by: Simon Song <xinmengs@nvidia.com>
---
 rust/kernel/pci.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs
index c60edd01b70..9e1d02588af 100644
--- a/rust/kernel/pci.rs
+++ b/rust/kernel/pci.rs
@@ -363,6 +363,13 @@ fn as_raw(&self) -> *mut bindings::pci_dev {
 }
 
 impl Device {
+    /// Returns `true` if this device is a Virtual Function (VF).
+    #[inline]
+    pub fn is_virtfn(&self) -> bool {
+        // SAFETY: `self.as_raw` is a valid pointer to a `struct pci_dev`.
+        unsafe { (*self.as_raw()).is_virtfn() != 0 }
+    }
+
     /// Returns the PCI vendor ID as [`Vendor`].
     ///
     /// # Examples
-- 
2.43.7