netdev - [PATCH net-next v2 5/6] rust: net::phy unified genphy_read_status function for C22 and C45 registers

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Message-Id: <20240731042136.201327-6-fujita.tomonori@gmail.com>
Date: Wed, 31 Jul 2024 13:21:35 +0900
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: netdev@...r.kernel.org
Cc: rust-for-linux@...r.kernel.org,
	andrew@...n.ch,
	tmgross@...ch.edu,
	miguel.ojeda.sandonis@...il.com,
	benno.lossin@...ton.me
Subject: [PATCH net-next v2 5/6] rust: net::phy unified genphy_read_status function for C22 and C45 registers

Add unified genphy_read_status function for C22 and C45
registers. Instead of having genphy_c22 and genphy_c45 methods, this
unifies genphy_read_status functions for C22 and C45.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>
Reviewed-by: Trevor Gross <tmgross@...ch.edu>
Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
---
 rust/kernel/net/phy.rs     | 12 ++----------
 rust/kernel/net/phy/reg.rs | 26 ++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs
index 7ee06dd5a1b1..938820704aca 100644
--- a/rust/kernel/net/phy.rs
+++ b/rust/kernel/net/phy.rs
@@ -249,16 +249,8 @@ pub fn genphy_suspend(&mut self) -> Result {
     }
 
     /// Checks the link status and updates current link state.
-    pub fn genphy_read_status(&mut self) -> Result<u16> {
-        let phydev = self.0.get();
-        // SAFETY: `phydev` is pointing to a valid object by the type invariant of `Self`.
-        // So it's just an FFI call.
-        let ret = unsafe { bindings::genphy_read_status(phydev) };
-        if ret < 0 {
-            Err(Error::from_errno(ret))
-        } else {
-            Ok(ret as u16)
-        }
+    pub fn genphy_read_status<R: reg::Register>(&mut self) -> Result<u16> {
+        R::read_status(self)
     }
 
     /// Updates the link status.
diff --git a/rust/kernel/net/phy/reg.rs b/rust/kernel/net/phy/reg.rs
index 91f73179315e..4cf47335539b 100644
--- a/rust/kernel/net/phy/reg.rs
+++ b/rust/kernel/net/phy/reg.rs
@@ -30,6 +30,11 @@ pub trait Sealed {}
 ///     dev.read(C22::BMCR);
 ///     // read C45 PMA/PMD control 1 register
 ///     dev.read(C45::new(Mmd::PMAPMD, 0));
+///
+///     // Checks the link status and updates current link state via C22.
+///     dev.genphy_read_status::<phy::C22>();
+///     // Checks the link status and updates current link state via C45.
+///     dev.genphy_read_status::<phy::C45>();
 /// }
 /// ```
 pub trait Register: private::Sealed {
@@ -38,6 +43,9 @@ pub trait Register: private::Sealed {
 
     /// Writes a PHY register.
     fn write(&self, dev: &mut Device, val: u16) -> Result;
+
+    /// Checks the link status and updates current link state.
+    fn read_status(dev: &mut Device) -> Result<u16>;
 }
 
 /// A single MDIO clause 22 register address (5 bits).
@@ -111,6 +119,15 @@ fn write(&self, dev: &mut Device, val: u16) -> Result {
             bindings::mdiobus_write((*phydev).mdio.bus, (*phydev).mdio.addr, self.0.into(), val)
         })
     }
+
+    fn read_status(dev: &mut Device) -> Result<u16> {
+        let phydev = dev.0.get();
+        // SAFETY: `phydev` is pointing to a valid object by the type invariant of `Self`.
+        // So it's just an FFI call.
+        let ret = unsafe { bindings::genphy_read_status(phydev) };
+        to_result(ret)?;
+        Ok(ret as u16)
+    }
 }
 
 /// A single MDIO clause 45 register device and address.
@@ -190,4 +207,13 @@ fn write(&self, dev: &mut Device, val: u16) -> Result {
             bindings::phy_write_mmd(phydev, self.devad.0.into(), self.regnum.into(), val)
         })
     }
+
+    fn read_status(dev: &mut Device) -> Result<u16> {
+        let phydev = dev.0.get();
+        // SAFETY: `phydev` is pointing to a valid object by the type invariant of `Self`.
+        // So it's just an FFI call.
+        let ret = unsafe { bindings::genphy_c45_read_status(phydev) };
+        to_result(ret)?;
+        Ok(ret as u16)
+    }
 }
-- 
2.34.1