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| -rw-r--r-- | rust/kernel/net/phy.rs | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs index b6142579e8fd..e457b3c7cb2f 100644 --- a/rust/kernel/net/phy.rs +++ b/rust/kernel/net/phy.rs @@ -753,3 +753,149 @@ impl DeviceMask { } } } + +/// Declares a kernel module for PHYs drivers. +/// +/// This creates a static array of kernel's `struct phy_driver` and registers it. +/// This also corresponds to the kernel's `MODULE_DEVICE_TABLE` macro, which embeds the information +/// for module loading into the module binary file. Every driver needs an entry in `device_table`. +/// +/// # Examples +/// +/// ``` +/// # mod module_phy_driver_sample { +/// use kernel::c_str; +/// use kernel::net::phy::{self, DeviceId}; +/// use kernel::prelude::*; +/// +/// kernel::module_phy_driver! { +/// drivers: [PhySample], +/// device_table: [ +/// DeviceId::new_with_driver::<PhySample>() +/// ], +/// name: "rust_sample_phy", +/// author: "Rust for Linux Contributors", +/// description: "Rust sample PHYs driver", +/// license: "GPL", +/// } +/// +/// struct PhySample; +/// +/// #[vtable] +/// impl phy::Driver for PhySample { +/// const NAME: &'static CStr = c_str!("PhySample"); +/// const PHY_DEVICE_ID: phy::DeviceId = phy::DeviceId::new_with_exact_mask(0x00000001); +/// } +/// # } +/// ``` +/// +/// This expands to the following code: +/// +/// ```ignore +/// use kernel::c_str; +/// use kernel::net::phy::{self, DeviceId}; +/// use kernel::prelude::*; +/// +/// struct Module { +/// _reg: ::kernel::net::phy::Registration, +/// } +/// +/// module! { +/// type: Module, +/// name: "rust_sample_phy", +/// author: "Rust for Linux Contributors", +/// description: "Rust sample PHYs driver", +/// license: "GPL", +/// } +/// +/// struct PhySample; +/// +/// #[vtable] +/// impl phy::Driver for PhySample { +/// const NAME: &'static CStr = c_str!("PhySample"); +/// const PHY_DEVICE_ID: phy::DeviceId = phy::DeviceId::new_with_exact_mask(0x00000001); +/// } +/// +/// const _: () = { +/// static mut DRIVERS: [::kernel::net::phy::DriverVTable; 1] = +/// [::kernel::net::phy::create_phy_driver::<PhySample>()]; +/// +/// impl ::kernel::Module for Module { +/// fn init(module: &'static ThisModule) -> Result<Self> { +/// let drivers = unsafe { &mut DRIVERS }; +/// let mut reg = ::kernel::net::phy::Registration::register( +/// module, +/// ::core::pin::Pin::static_mut(drivers), +/// )?; +/// Ok(Module { _reg: reg }) +/// } +/// } +/// }; +/// +/// #[cfg(MODULE)] +/// #[no_mangle] +/// static __mod_mdio__phydev_device_table: [::kernel::bindings::mdio_device_id; 2] = [ +/// ::kernel::bindings::mdio_device_id { +/// phy_id: 0x00000001, +/// phy_id_mask: 0xffffffff, +/// }, +/// ::kernel::bindings::mdio_device_id { +/// phy_id: 0, +/// phy_id_mask: 0, +/// }, +/// ]; +/// ``` +#[macro_export] +macro_rules! module_phy_driver { + (@replace_expr $_t:tt $sub:expr) => {$sub}; + + (@count_devices $($x:expr),*) => { + 0usize $(+ $crate::module_phy_driver!(@replace_expr $x 1usize))* + }; + + (@device_table [$($dev:expr),+]) => { + // SAFETY: C will not read off the end of this constant since the last element is zero. + #[cfg(MODULE)] + #[no_mangle] + static __mod_mdio__phydev_device_table: [$crate::bindings::mdio_device_id; + $crate::module_phy_driver!(@count_devices $($dev),+) + 1] = [ + $($dev.mdio_device_id()),+, + $crate::bindings::mdio_device_id { + phy_id: 0, + phy_id_mask: 0 + } + ]; + }; + + (drivers: [$($driver:ident),+ $(,)?], device_table: [$($dev:expr),+ $(,)?], $($f:tt)*) => { + struct Module { + _reg: $crate::net::phy::Registration, + } + + $crate::prelude::module! { + type: Module, + $($f)* + } + + const _: () = { + static mut DRIVERS: [$crate::net::phy::DriverVTable; + $crate::module_phy_driver!(@count_devices $($driver),+)] = + [$($crate::net::phy::create_phy_driver::<$driver>()),+]; + + impl $crate::Module for Module { + fn init(module: &'static ThisModule) -> Result<Self> { + // SAFETY: The anonymous constant guarantees that nobody else can access + // the `DRIVERS` static. The array is used only in the C side. + let drivers = unsafe { &mut DRIVERS }; + let mut reg = $crate::net::phy::Registration::register( + module, + ::core::pin::Pin::static_mut(drivers), + )?; + Ok(Module { _reg: reg }) + } + } + }; + + $crate::module_phy_driver!(@device_table [$($dev),+]); + } +} |