linux-kernel - Re: [PATCH bpf-next v1 0/6] Introduce eBPF support for HID devices

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Message-ID: <f965c04f34aabe93fe8ef91bb4d1ce4d24159173.camel@hadess.net>
Date:   Thu, 24 Feb 2022 18:41:18 +0100
From:   Bastien Nocera <hadess@...ess.net>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Joe Stringer <joe@...ium.io>,
        Tero Kristo <tero.kristo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v1 0/6] Introduce eBPF support for HID devices

On Thu, 2022-02-24 at 12:31 +0100, Greg KH wrote:
> On Thu, Feb 24, 2022 at 12:08:22PM +0100, Benjamin Tissoires wrote:
> > Hi there,
> > 
> > This series introduces support of eBPF for HID devices.
> > 
> > I have several use cases where eBPF could be interesting for those
> > input devices:
> > 
> > - simple fixup of report descriptor:
> > 
> > In the HID tree, we have half of the drivers that are "simple" and
> > that just fix one key or one byte in the report descriptor.
> > Currently, for users of such devices, the process of fixing them
> > is long and painful.
> > With eBPF, we could externalize those fixups in one external repo,
> > ship various CoRe bpf programs and have those programs loaded at
> > boot
> > time without having to install a new kernel (and wait 6 months for
> > the
> > fix to land in the distro kernel)
> 
> Why would a distro update such an external repo faster than they
> update
> the kernel?  Many sane distros update their kernel faster than other
> packages already, how about fixing your distro?  :)
> 
> I'm all for the idea of using ebpf for HID devices, but now we have
> to
> keep track of multiple packages to be in sync here.  Is this making
> things harder overall?

I don't quite understand how taking eBPF quirks for HID devices out of
the kernel tree is different from taking suspend quirks out of the
kernel tree:
https://www.spinics.net/lists/linux-usb/msg204506.html