linux-kernel - Re: [PATCH bpf-next] bpf: Add bpf_cgroup_from

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Date:   Wed, 22 Feb 2023 15:22:53 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        bpf <bpf@...r.kernel.org>,
        Dave Marchevsky <davemarchevsky@...a.com>,
        David Vernet <void@...ifault.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Kernel Team <kernel-team@...a.com>
Subject: Re: [PATCH bpf-next] bpf: Add bpf_cgroup_from_id() kfunc

On Wed, Feb 22, 2023 at 01:20:19PM -0800, Alexei Starovoitov wrote:
> On Tue, Feb 21, 2023 at 2:09 PM Tejun Heo <tj@...nel.org> wrote:
> >
> > cgroup ID is an userspace-visible 64bit value uniquely identifying a given
> > cgroup. As the IDs are used widely, it's useful to be able to look up the
> > matching cgroups. Add bpf_cgroup_from_id().
> >
> > Signed-off-by: Tejun Heo <tj@...nel.org>
> > ---
> >  Documentation/bpf/kfuncs.rst                  | 10 +++--
> >  kernel/bpf/helpers.c                          | 18 ++++++++
> >  .../selftests/bpf/prog_tests/cgrp_kfunc.c     |  1 +
> >  .../selftests/bpf/progs/cgrp_kfunc_common.h   |  1 +
> >  .../selftests/bpf/progs/cgrp_kfunc_success.c  | 42 +++++++++++++++++++
> >  5 files changed, 69 insertions(+), 3 deletions(-)
> 
> Looks great, but could you please split it into two patches:
> One for helpers.c and kfuncs.rst and another for selftests
> with [PATCH bpf-next] selftests/bpf: subject ?
> Doesn't matter much in this case, but it might ease backporting
> and easier to track patches grouped by subj.

Will do.

Thanks.

-- 
tejun