netdev - Re: [PATCH v2 bpf-next 03/14] bpf: Support bpf program calling kernel function

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Message-ID: <20210325230940.2pequmyzwzv65sub@kafai-mbp.dhcp.thefacebook.com>
Date:   Thu, 25 Mar 2021 16:09:40 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
CC:     <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 bpf-next 03/14] bpf: Support bpf program calling
 kernel function

On Thu, Mar 25, 2021 at 11:02:23PM +0100, Toke Høiland-Jørgensen wrote:
> Martin KaFai Lau <kafai@...com> writes:
> 
> > This patch adds support to BPF verifier to allow bpf program calling
> > kernel function directly.
> 
> Hi Martin
> 
> This is exciting stuff! :)
> 
> Just one quick question about this:
> 
> > [ For the future calling function-in-kernel-module support, an array
> >   of module btf_fds can be passed at the load time and insn->off
> >   can be used to index into this array. ]
> 
> Is adding the support for extending this to modules also on your radar,
> or is this more of an "in case someone needs it" comment? :)
It is in my list.  I don't mind someone beats me to it though
if he/she has an immediate use case. ;)