netdev - Re: [PATCH v2 3/3] net: phy: add Rust Asix PHY driver

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Date: Sat, 07 Oct 2023 01:21:00 +0900 (JST)
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: andrew@...n.ch
Cc: fujita.tomonori@...il.com, gregkh@...uxfoundation.org,
 netdev@...r.kernel.org, rust-for-linux@...r.kernel.org,
 miguel.ojeda.sandonis@...il.com
Subject: Re: [PATCH v2 3/3] net: phy: add Rust Asix PHY driver

On Fri, 6 Oct 2023 17:57:41 +0200
Andrew Lunn <andrew@...n.ch> wrote:

>> Now I'm thinking that this is the best option. Kconfig would be the following:
>> 
>> config AX88796B_PHY
>>         tristate "Asix PHYs"
>>         help
>>          Currently supports the Asix Electronics PHY found in the X-Surf 100
>>          AX88796B package.
>> 
>> choice
>>         prompt "Implementation options"
>>         depends on AX88796B_PHY
>>         help
>>          There are two implementations for a driver for Asix PHYs; C and Rust.
>>          If not sure, choose C.
>> 
>> config AX88796B_C_PHY
>>         bool "The C version driver for Asix PHYs"
>> 
>> config AX88796B_RUST_PHY
>>         bool "The Rust version driver for Asix PHYs"
>>         depends on RUST
>> 
>> endchoice
>> 
>> 
>> No hack in Makefile:
>> 
>> obj-$(CONFIG_AX88796B_C_PHY)    += ax88796b.o
>> obj-$(CONFIG_AX88796B_RUST_PHY) += ax88796b_rust.o
> 
> This looks reasonable. Lets use this. But i still think we need some
> sort of RUST_PHYLIB_BINDING.

How about adding CONFIG_RUST_PHYLIB to the first patch. Not
selectable, it's just a flag for Rust PHYLIB support.

diff --git a/init/Kconfig b/init/Kconfig
index 4b4e3df1658d..2b6627aeb98c 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1889,7 +1889,7 @@ config RUST
 	depends on !GCC_PLUGINS
 	depends on !RANDSTRUCT
 	depends on !DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE
	depends on PHYLIB=y
+	select RUST_PHYLIB
 	select CONSTRUCTORS
 	help
 	  Enables Rust support in the kernel.
@@ -1904,6 +1904,10 @@ config RUST
 
 	  If unsure, say N.
 
+config RUST_PHYLIB
+	bool
+
 config RUSTC_VERSION_TEXT
 	string
 	depends on RUST


Then the driver depends on RUST instead of RUST_PHYLIB.

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 82ecfffc276c..e0d7a19ca774 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -119,7 +119,7 @@ config AX88796B_C_PHY
 
 config AX88796B_RUST_PHY
 	bool "The Rust version driver for Asix PHYs"
-	depends on RUST
+	depends on RUST_PHYLIB
 
 endchoice