linux-kernel - [RFC 1/7] rust: pci: expose sriov_get

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Message-ID: <20251206124208.305963-2-zhiw@nvidia.com>
Date: Sat, 6 Dec 2025 12:42:02 +0000
From: Zhi Wang <zhiw@...dia.com>
To: <rust-for-linux@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<nouveau@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC: <airlied@...il.com>, <dakr@...nel.org>, <aliceryhl@...gle.com>,
	<bhelgaas@...gle.com>, <kwilczynski@...nel.org>, <ojeda@...nel.org>,
	<alex.gaynor@...il.com>, <boqun.feng@...il.com>, <gary@...yguo.net>,
	<bjorn3_gh@...tonmail.com>, <lossin@...nel.org>, <a.hindborg@...nel.org>,
	<tmgross@...ch.edu>, <markus.probst@...teo.de>, <helgaas@...nel.org>,
	<cjia@...dia.com>, <alex@...zbot.org>, <smitra@...dia.com>,
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	<targupta@...dia.com>, <acourbot@...dia.com>, <joelagnelf@...dia.com>,
	<jhubbard@...dia.com>, <zhiwang@...nel.org>, Zhi Wang <zhiw@...dia.com>
Subject: [RFC 1/7] rust: pci: expose sriov_get_totalvfs() helper

Add a wrapper for the `pci_sriov_get_totalvfs()` helper, allowing drivers
to query the number of total SR-IOV virtual functions a PCI device
supports.

This is useful for components that need to conditionally enable features
based on SR-IOV capability.

Signed-off-by: Zhi Wang <zhiw@...dia.com>
---
 rust/kernel/pci.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs
index 7fcc5f6022c1..9a82e83dfd30 100644
--- a/rust/kernel/pci.rs
+++ b/rust/kernel/pci.rs
@@ -514,6 +514,18 @@ pub fn pci_class(&self) -> Class {
         // SAFETY: `self.as_raw` is a valid pointer to a `struct pci_dev`.
         Class::from_raw(unsafe { (*self.as_raw()).class })
     }
+
+    /// Returns total number of VFs, or `Err(ENODEV)` if none available.
+    pub fn sriov_get_totalvfs(&self) -> Result<i32> {
+        // SAFETY: `self.as_raw()` is a valid pointer to a `struct pci_dev`.
+        let vfs = unsafe { bindings::pci_sriov_get_totalvfs(self.as_raw()) };
+
+        if vfs != 0 {
+            Ok(vfs)
+        } else {
+            Err(ENODEV)
+        }
+    }
 }
 
 impl Device<device::Bound> {
-- 
2.51.0