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rust: net::phy implement AsRef<kernel::device::Device> trait

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Implement AsRef<kernel::device::Device> trait for Device. A PHY driver
needs a reference to device::Device to call the firmware API.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
FUJITA Tomonori 2024-08-28 07:35:13 +00:00 committed by David S. Miller
parent ffd2747de6
commit 7909892a9f
1 changed files with 17 additions and 7 deletions
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24
rust/kernel/net/phy.rs
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@ -7,8 +7,7 @@
//! C headers: [`include/linux/phy.h`](srctree/include/linux/phy.h).
use crate::{error::*, prelude::*, types::Opaque};
use core::marker::PhantomData;
use core::{marker::PhantomData, ptr::addr_of_mut};
/// PHY state machine states.
///
@ -58,8 +57,9 @@ pub enum DuplexMode {
///
/// # Invariants
///
/// Referencing a `phy_device` using this struct asserts that you are in
/// a context where all methods defined on this struct are safe to call.
/// - Referencing a `phy_device` using this struct asserts that you are in
/// a context where all methods defined on this struct are safe to call.
/// - This struct always has a valid `self.0.mdio.dev`.
///
/// [`struct phy_device`]: srctree/include/linux/phy.h
// During the calls to most functions in [`Driver`], the C side (`PHYLIB`) holds a lock that is
@ -76,9 +76,11 @@ impl Device {
///
/// # Safety
///
/// For the duration of 'a, the pointer must point at a valid `phy_device`,
/// and the caller must be in a context where all methods defined on this struct
/// are safe to call.
/// For the duration of `'a`,
/// - the pointer must point at a valid `phy_device`, and the caller
/// must be in a context where all methods defined on this struct
/// are safe to call.
/// - `(*ptr).mdio.dev` must be a valid.
unsafe fn from_raw<'a>(ptr: *mut bindings::phy_device) -> &'a mut Self {
// CAST: `Self` is a `repr(transparent)` wrapper around `bindings::phy_device`.
let ptr = ptr.cast::<Self>();
@ -302,6 +304,14 @@ impl Device {
}
}
impl AsRef<kernel::device::Device> for Device {
fn as_ref(&self) -> &kernel::device::Device {
let phydev = self.0.get();
// SAFETY: The struct invariant ensures that `mdio.dev` is valid.
unsafe { kernel::device::Device::as_ref(addr_of_mut!((*phydev).mdio.dev)) }
}
}
/// Defines certain other features this PHY supports (like interrupts).
///
/// These flag values are used in [`Driver::FLAGS`].