linux-kernel - Re: [PATCH 2/2] samples: rust: add a USB driver sample

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Message-ID: <a5420377-1d23-4453-af73-430022dd6a6d@rowland.harvard.edu>
Date: Sat, 6 Sep 2025 10:49:47 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Daniel Almeida <daniel.almeida@...labora.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>, linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/2] samples: rust: add a USB driver sample

On Sat, Sep 06, 2025 at 03:07:16PM +0200, Greg Kroah-Hartman wrote:
> On Sat, Sep 06, 2025 at 09:41:16AM -0300, Daniel Almeida wrote:
> > By the way, I wonder how testing would work. I tested this by plugging in my
> > mouse and fiddling around with /sys/bus/usb/drivers/rust_driver_usb/new_id. I
> > am not sure how this is going to work once I start looking into data transfer
> > and etc. Perhaps there's a simple device out there that I should target? Or
> > maybe there's a way to "fake" a USB device that would work with the sample
> > driver for demonstration purposes.
> 
> You can use the usb-gadget subsystem and dummy-hcd to create a loop-back
> for a virtual USB device.  That's how syzbot does USB driver fuzz
> testing, there should be some documentation on that somewhere in the
> tree.

Gadget zero is a good one to use for testing.  That's what it's meant 
for.  If you need any help setting it up, just ask.

Alan Stern