netdev - Re: [PATCH net-next v3 0/3] Rust abstractions for network PHY drivers

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Message-ID: <5334dc69-1604-4408-9cce-3c89bc5d7688@lunn.ch>
Date: Mon, 9 Oct 2023 14:48:24 +0200
From: Andrew Lunn <andrew@...n.ch>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: netdev@...r.kernel.org, rust-for-linux@...r.kernel.org,
	miguel.ojeda.sandonis@...il.com, greg@...ah.com, tmgross@...ch.edu
Subject: Re: [PATCH net-next v3 0/3] Rust abstractions for network PHY drivers

On Mon, Oct 09, 2023 at 10:39:09AM +0900, FUJITA Tomonori wrote:
> This patchset adds Rust abstractions for phylib. It doesn't fully
> cover the C APIs yet but I think that it's already useful. I implement
> two PHY drivers (Asix AX88772A PHYs and Realtek Generic FE-GE). Seems
> they work well with real hardware.
> 
> The first patch introduces Rust bindings for phylib.
> 
> The second patch updates the ETHERNET PHY LIBRARY entry in MAINTAINERS
> file; adds the binding file and me as a maintainer of the Rust
> bindings (as Andrew Lunn suggested).
> 
> The last patch introduces the Rust version of Asix PHY drivers,
> drivers/net/phy/ax88796b.c. The features are equivalent to the C
> version. You can choose C (by default) or Rust version on kernel
> configuration.

I at last got around to installing a rust tool chain and tried to
build the code. I get what looks like linker errors.

linux$ make LLVM=1 rustavailable
Rust is available!

dpkg says:

+++-==============-============-============-=================================
ii  llvm           1:16.0-57    amd64        Low-Level Virtual Machine (LLVM)

I build with

make LLVM=1

and get lots of warnings like:

vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placeANtNtNtB4_5ascii10ascii_char9AsciiCharja_EB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placeFUPuENtNtNtB4_4task4wake8RawWakerEB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placeINtNtB4_6option6OptionINtNtNtNtB4_4iter8adapters7flatten7FlattenINtBJ_8IntoIterNtNtB4_4char11EscapeDebugEEEEB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placeNtNtB4_3fmt5ErrorEB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RINvNtCs4KbNGwnAC5t_4core3ptr13drop_in_placesEB4_+0x0: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f8classify+0x5a: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f16partial_classify+0x1f: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f13classify_bits+0x28: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f7next_up+0x32: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f9next_down+0x34: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvMNtCs4KbNGwnAC5t_4core3f32f8midpoint+0xc3: 'naked' return found in RETHUNK build
vmlinux.o: warning: objtool: _RNvNvMNtCs4KbNGwnAC5t_4core3f32f7to_bits13ct_f32_to_u32+0x4a: 'naked' return found in RETHUNK build

Any ideas?

    Andrew