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[153.204.200.7]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71df0cd08besm1397878b3a.79.2024.10.05.05.26.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Oct 2024 05:26:22 -0700 (PDT) From: FUJITA Tomonori To: netdev@vger.kernel.org Cc: rust-for-linux@vger.kernel.org, andrew@lunn.ch, hkallweit1@gmail.com, tmgross@umich.edu, ojeda@kernel.org, alex.gaynor@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, benno.lossin@proton.me, a.hindborg@samsung.com, aliceryhl@google.com, anna-maria@linutronix.de, frederic@kernel.org, tglx@linutronix.de, arnd@arndb.de, linux-kernel@vger.kernel.org Subject: [PATCH net-next v2 2/6] rust: time: Introduce Delta type Date: Sat, 5 Oct 2024 21:25:27 +0900 Message-ID: <20241005122531.20298-3-fujita.tomonori@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241005122531.20298-1-fujita.tomonori@gmail.com> References: <20241005122531.20298-1-fujita.tomonori@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org Introduce a type representing a span of time. Define our own type because `core::time::Duration` is large and could panic during creation. We could use time::Ktime for time duration but timestamp and timedelta are different so better to use a new type. Signed-off-by: FUJITA Tomonori --- rust/kernel/time.rs | 64 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs index c40105941a2c..6c5a1c50c5f1 100644 --- a/rust/kernel/time.rs +++ b/rust/kernel/time.rs @@ -8,9 +8,15 @@ //! C header: [`include/linux/jiffies.h`](srctree/include/linux/jiffies.h). //! C header: [`include/linux/ktime.h`](srctree/include/linux/ktime.h). +/// The number of nanoseconds per microsecond. +pub const NSEC_PER_USEC: i64 = bindings::NSEC_PER_USEC as i64; + /// The number of nanoseconds per millisecond. pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64; +/// The number of nanoseconds per second. +pub const NSEC_PER_SEC: i64 = bindings::NSEC_PER_SEC as i64; + /// The time unit of Linux kernel. One jiffy equals (1/HZ) second. pub type Jiffies = core::ffi::c_ulong; @@ -103,3 +109,61 @@ fn partial_cmp(&self, other: &Self) -> Option { } } } + +/// A span of time. +#[derive(Copy, Clone)] +pub struct Delta { + nanos: i64, +} + +impl Delta { + /// Create a new `Delta` from a number of nanoseconds. + #[inline] + pub fn from_nanos(nanos: u16) -> Self { + Self { + nanos: nanos.into(), + } + } + + /// Create a new `Delta` from a number of microseconds. + #[inline] + pub fn from_micros(micros: u16) -> Self { + Self { + nanos: micros as i64 * NSEC_PER_USEC, + } + } + + /// Create a new `Delta` from a number of milliseconds. + #[inline] + pub fn from_millis(millis: u16) -> Self { + Self { + nanos: millis as i64 * NSEC_PER_MSEC, + } + } + + /// Create a new `Delta` from a number of seconds. + #[inline] + pub fn from_secs(secs: u16) -> Self { + Self { + nanos: secs as i64 * NSEC_PER_SEC, + } + } + + /// Return `true` if the `Detla` spans no time. + #[inline] + pub fn is_zero(self) -> bool { + self.nanos == 0 + } + + /// Return the number of nanoseconds in the `Delta`. + #[inline] + pub fn as_nanos(self) -> i64 { + self.nanos + } + + /// Return the number of microseconds in the `Delta`. + #[inline] + pub fn as_micros(self) -> i64 { + self.nanos / NSEC_PER_USEC + } +}