Re: [PATCH v8 1/1] rust: pci: add extended capability and SR-IOV support

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] The `ExtSriovVfBars` struct is constructed without an `// INVARIANT:` comment explaining why its invariants are satisfied.
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--- Patch [1]: [PATCH v8 1/1] rust: pci: add extended capability and SR-IOV support ---
commit e0446bc8a9435cb9072472f040f7215e21d10ce1
Author: Zhi Wang <zhiw@nvidia.com>

rust: pci: add extended capability and SR-IOV support

This commit adds Rust PCI abstractions for locating and accessing PCIe
extended capabilities. It provides specific support for the SR-IOV
extended capability and a decoded VF BAR iterator.

Link: https://lore.kernel.org/rust-for-linux/20260804161612.776752-1-zhiw@nvidia.com/

> diff --git a/rust/kernel/pci/cap.rs b/rust/kernel/pci/cap.rs
> new file mode 100644
> index 0000000000000..ddb3fd73e1955
> --- /dev/null
> +++ b/rust/kernel/pci/cap.rs

[ ... ]

> +struct ExtSriovVfBars {
> +    bars: [ExtSriovVfBar; NUM_VF_BARS],
> +    bar_count: usize,
> +    next_bar: usize,
> +}
> +
> +impl ExtSriovVfBars {
> +    fn new(slots: [u32; NUM_VF_BARS]) -> Result<Self> {

[ ... ]

> +            bars[bar_count] = ExtSriovVfBar { address, is_64bit };
> +            bar_count += 1;
> +        }
> +
> +        Ok(Self {
> +            bars,
> +            bar_count,
> +            next_bar: 0,
> +        })

[Severity: Low]
This isn't a bug, but the Rust subsystem guidelines require an // INVARIANT:
comment when constructing a struct that has documented invariants.
ExtSriovVfBars documents its invariants above, but is constructed here
without explaining how they are satisfied. Could an // INVARIANT: comment
be added here?

> +    }
> +}

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Sashiko AI review · https://sashiko.dev/#/patchset/20260818084633.1673214-2-zhiw@nvidia.com?part=1