netdev - Re: [PATCH bpf-next v2 13/28] HID: bpf: implement hid_bpf_get|set

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Message-ID: <YiJc+Gu93NLA8kvr@kroah.com>
Date:   Fri, 4 Mar 2022 19:39:52 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     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 v2 13/28] HID: bpf: implement
 hid_bpf_get|set_data

On Fri, Mar 04, 2022 at 06:28:37PM +0100, Benjamin Tissoires wrote:
> We have 2 cases of usage here:
> - either n <= 32: we are addressing individual bits at the given offset
> 
> - either n > 32: we are using a memcpy to transmit the data to the caller,
>   meaning that we need to be byte-aligned.

That is crazy.  Can you split this into a bits/bytes function set to
have 4 of them?  You are using each function in two totally different
ways.

thanks,

greg k-h