linux-kernel - Re: [PATCH net-next v2 0/6] rust: Add IO polling

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Message-ID: <ZwqVwktWNMrxFvGH@boqun-archlinux>
Date: Sat, 12 Oct 2024 08:29:06 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: netdev@...r.kernel.org, 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: Re: [PATCH net-next v2 0/6] rust: Add IO polling

Hi Tomo,

On Sat, Oct 05, 2024 at 09:25:25PM +0900, FUJITA Tomonori wrote:
> Add Rust version of read_poll_timeout (include/linux/iopoll.h), which
> polls periodically until a condition is met or a timeout is reached.
> By using the function, the 6th patch fixes QT2025 PHY driver to sleep
> until the hardware becomes ready.
> 
> As a result of the past discussion, this introduces a new type
> representing a span of time instead of using core::time::Duration or
> time::Ktime.
> 

While, we are at it, I want to suggest that we also add
rust/kernel/time{.rs, /} into the "F:" entries of TIME subsystem like:

diff --git a/MAINTAINERS b/MAINTAINERS
index b77f4495dcf4..09e46a214333 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23376,6 +23376,8 @@ F:      kernel/time/timeconv.c
 F:     kernel/time/timecounter.c
 F:     kernel/time/timekeeping*
 F:     kernel/time/time_test.c
+F:     rust/kernel/time.rs
+F:     rust/kernel/time/
 F:     tools/testing/selftests/timers/

 TIPC NETWORK LAYER

This will help future contributers copy the correct people while
submission. Could you maybe add a patch of this in your series if this
sounds reasonable to you? Thanks!

Regards,
Boqun

> Unlike the old rust branch, This adds a wrapper for fsleep() instead
> of msleep(). fsleep() automatically chooses the best sleep method
> based on a duration.
> 
> v2:
> - Introduce time::Delta instead of core::time::Duration
> - Add some trait to Ktime for calculating timeout
> - Use read_poll_timeout in QT2025 driver instead of using fsleep directly
> v1: https://lore.kernel.org/netdev/20241001112512.4861-1-fujita.tomonori@gmail.com/
> 
> 
> FUJITA Tomonori (6):
>   rust: time: Implement PartialEq and PartialOrd for Ktime
>   rust: time: Introduce Delta type
>   rust: time: Implement addition of Ktime and Delta
>   rust: time: add wrapper for fsleep function
>   rust: Add read_poll_timeout function
>   net: phy: qt2025: wait until PHY becomes ready
> 
>  drivers/net/phy/qt2025.rs |  11 +++-
>  rust/helpers/helpers.c    |   2 +
>  rust/helpers/kernel.c     |  13 +++++
>  rust/helpers/time.c       |  19 +++++++
>  rust/kernel/error.rs      |   1 +
>  rust/kernel/io.rs         |   5 ++
>  rust/kernel/io/poll.rs    |  70 +++++++++++++++++++++++
>  rust/kernel/lib.rs        |   1 +
>  rust/kernel/time.rs       | 113 ++++++++++++++++++++++++++++++++++++++
>  9 files changed, 234 insertions(+), 1 deletion(-)
>  create mode 100644 rust/helpers/kernel.c
>  create mode 100644 rust/helpers/time.c
>  create mode 100644 rust/kernel/io.rs
>  create mode 100644 rust/kernel/io/poll.rs
> 
> 
> base-commit: d521db38f339709ccd23c5deb7663904e626c3a6
> -- 
> 2.34.1
> 
>