netdev - Re: [RFC] Add BPF_PROG_TYPE_CGROUP

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Date:   Mon, 2 Nov 2020 21:42:52 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Kenny Ho <y2kenny@...il.com>
Cc:     Kenny Ho <Kenny.Ho@....com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
        "open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>,
        Alex Deucher <alexander.deucher@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>
Subject: Re: [RFC] Add BPF_PROG_TYPE_CGROUP_IOCTL

On Mon, Nov 2, 2020 at 9:39 PM Kenny Ho <y2kenny@...il.com> wrote:
>
> Thanks for the reply.

pls don't top post.

> Cgroup awareness is desired because the intent
> is to use this for resource management as well (potentially along with
> other cgroup controlled resources.)  I will dig into bpf_lsm and learn
> more about it.

Also consider that bpf_lsm hooks have a way to get cgroup-id without
being explicitly scoped. So the bpf program can be made cgroup aware.
It's just not as convenient as attaching a prog to cgroup+hook at once.
For prototyping the existing bpf_lsm facility should be enough.
So please try to follow this route and please share more details about
the use case.