linux-kernel - [PATCH net-next v2 3/6] rust: time: Implement addition of Ktime and Delta

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Message-ID: <20241005122531.20298-4-fujita.tomonori@gmail.com>
Date: Sat,  5 Oct 2024 21:25:28 +0900
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: netdev@...r.kernel.org
Cc: rust-for-linux@...r.kernel.org,
	andrew@...n.ch,
	hkallweit1@...il.com,
	tmgross@...ch.edu,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...sung.com,
	aliceryhl@...gle.com,
	anna-maria@...utronix.de,
	frederic@...nel.org,
	tglx@...utronix.de,
	arnd@...db.de,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 3/6] rust: time: Implement addition of Ktime and Delta

Implement Add<Delta> for Ktime to support the operation:

Ktime = Ktime + Delta

This is used to calculate the future time when the timeout will occur.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>
---
 rust/helpers/time.c |  5 +++++
 rust/kernel/time.rs | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/rust/helpers/time.c b/rust/helpers/time.c
index d6f61affb2c3..60dee69f4efc 100644
--- a/rust/helpers/time.c
+++ b/rust/helpers/time.c
@@ -2,6 +2,11 @@
 
 #include <linux/ktime.h>
 
+ktime_t rust_helper_ktime_add_ns(const ktime_t kt, const u64 nsec)
+{
+	return ktime_add_ns(kt, nsec);
+}
+
 int rust_helper_ktime_compare(const ktime_t cmp1, const ktime_t cmp2)
 {
 	return ktime_compare(cmp1, cmp2);
diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
index 6c5a1c50c5f1..3e00ad22ed89 100644
--- a/rust/kernel/time.rs
+++ b/rust/kernel/time.rs
@@ -167,3 +167,14 @@ pub fn as_micros(self) -> i64 {
         self.nanos / NSEC_PER_USEC
     }
 }
+
+impl core::ops::Add<Delta> for Ktime {
+    type Output = Ktime;
+
+    #[inline]
+    fn add(self, delta: Delta) -> Ktime {
+        // SAFETY: FFI call.
+        let t = unsafe { bindings::ktime_add_ns(self.inner, delta.as_nanos() as u64) };
+        Ktime::from_raw(t)
+    }
+}
-- 
2.34.1