linux-kernel - Re: [PATCH bpf-next v5 00/17] Introduce eBPF support for HID devices

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Message-ID: <87ee0p951b.fsf@toke.dk>
Date:   Thu, 19 May 2022 12:43:12 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Christoph Hellwig <hch@...radead.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        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>, Jonathan Corbet <corbet@....net>,
        Tero Kristo <tero.kristo@...ux.intel.com>,
        lkml <linux-kernel@...r.kernel.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>
Subject: Re: [PATCH bpf-next v5 00/17] Introduce eBPF support for HID devices

Benjamin Tissoires <benjamin.tissoires@...hat.com> writes:

> On Thu, May 19, 2022 at 10:39 AM Christoph Hellwig <hch@...radead.org> wrote:
>>
>> On Thu, May 19, 2022 at 10:20:35AM +0200, Greg KH wrote:
>> > > are written using a hip new VM?
>> >
>> > Ugh, don't mention UDI, that's a bad flashback...
>>
>> But that is very much what we are doing here.
>>
>> > I thought the goal here was to move a lot of the quirk handling and
>> > "fixup the broken HID decriptors in this device" out of kernel .c code
>> > and into BPF code instead, which this patchset would allow.
>
> Yes, quirks are a big motivation for this work. Right now half of the
> HID drivers are less than 100 lines of code, and are just trivial
> fixes (one byte in the report descriptor, one key mapping, etc...).
> Using eBPF for those would simplify the process from the user point of
> view: you drop a "firmware fix" as an eBPF program in your system and
> you can continue working on your existing kernel.

How do you envision those BPF programs living, and how would they be
distributed? (In-tree / out of tree?)

-Toke