netdev - Re: [net-next PATCH v10 7/7] rust: net::phy sync with match_phy

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Message-Id: <20250519.214449.1761137544422192991.fujita.tomonori@gmail.com>
Date: Mon, 19 May 2025 21:44:49 +0900 (JST)
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: lossin@...nel.org
Cc: fujita.tomonori@...il.com, ansuelsmth@...il.com, andrew+netdev@...n.ch,
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Subject: Re: [net-next PATCH v10 7/7] rust: net::phy sync with
 match_phy_device C changes

On Mon, 19 May 2025 14:32:44 +0200
"Benno Lossin" <lossin@...nel.org> wrote:

>>>> The other use case, as mentioned above, is when using the generic helper
>>>> function inside match_phy_device() callback. For example, the 4th
>>>> patch in this patchset adds genphy_match_phy_device():
>>>>
>>>> int genphy_match_phy_device(struct phy_device *phydev,
>>>>                            const struct phy_driver *phydrv)
>>>>
>>>> We could add a wrapper for this function as phy::Device's method like
>>>>
>>>> impl Device {
>>>>     ...
>>>>     pub fn genphy_match_phy_device(&self, drv: &phy::DriverVTable) -> i32 
>>> 
>>> Not sure why this returns an `i32`, but we probably could have such a
>>
>> Maybe a bool would be more appropriate here because the C's comment
>> says:
>>
>> Return: 1 if the PHY device matches the driver, 0 otherwise.
>>
>>> function as well (though I wouldn't use the vtable for that).
>>
>> What would you use instead?
> 
> The concept that I sketched above:
> 
>     impl Device {
>         fn genphy_match_phy_device<T: Driver>(&self) -> bool {
>             self.phy_id() == T::PHY_DEVICE_ID.id
>         }
>     }

I think there might be a misunderstanding.

Rust's genphy_match_phy_device() is supposed to be a wrapper for C's
genphy_match_phy_device():

https://lore.kernel.org/rust-for-linux/20250517201353.5137-5-ansuelsmth@gmail.com/