netdev - Re: [PATCH bpf-next 0/4] libbpf: Move CO-RE logic into separate file.

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Date:   Tue, 27 Jul 2021 21:49:01 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next 0/4] libbpf: Move CO-RE logic into separate file.

On Mon, Jul 26, 2021 at 12:38 PM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Tue, Jul 20, 2021 at 5:08 PM Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:
> >
> > From: Alexei Starovoitov <ast@...nel.org>
> >
> > Split CO-RE processing logic from libbpf into separate file
> > with an interface that doesn't dependend on libbpf internal details.
> > As the next step relo_core.c will be compiled with libbpf and with the kernel.
> > The _internal_ interface between libbpf/CO-RE and kernel/CO-RE will be:
> > int bpf_core_apply_relo_insn(const char *prog_name, struct bpf_insn *insn,
> >                              int insn_idx,
> >                              const struct bpf_core_relo *relo,
> >                              int relo_idx,
> >                              const struct btf *local_btf,
> >                              struct bpf_core_cand_list *cands);
> > where bpf_core_relo and bpf_core_cand_list are simple types
> > prepared by kernel and libbpf.
> >
> > Though diff stat shows a lot of lines inserted/deleted they are moved lines.
> > Pls review with diff.colorMoved.
> >
> > Alexei Starovoitov (4):
> >   libbpf: Cleanup the layering between CORE and bpf_program.
> >   libbpf: Split bpf_core_apply_relo() into bpf_program indepdent helper.
> >   libbpf: Move CO-RE types into relo_core.h.
> >   libbpf: Split CO-RE logic into relo_core.c.
> >
>
> LGTM. Applied to bpf-next, fixed typo in patch 3 subject, and also
> made few adjustments. Let me know if you object to any of them:
>
> 1. I felt like the original copyright year should be preserved when
> moving code into a new file, so I've changed relo_core.h's year to
> 2019. Hope that's fine.
> 2. relo_core.c didn't have a Copyright line, so I added the /*
> Copyright (c) 2019 Facebook */ as well.
> 3. I trimmed down the list of #includes in core_relo.c, because most
> of them were absolutely irrelevant and just preserved as-is from
> libbpf.c Everything seems to compile just fine without those.

Thanks! Much appreciate it.
It was on my todo list. I lazily copy-pasted them to avoid
accidental breakage on some archs that I don't have access to
(since I didn't wait for the kernel build bot to process them before I
sent them).
fyi intel folks can include your private tree as well, so you'd have to respin
your patches due to odd 32-bit build breakage. Just email them with
your git tree location.