linux-kernel - Re: [PATCH bpf-next v1] bpftool: Add support for querying cgroup

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Message-ID: <c84fa46d-8f37-c449-06ea-5da795f091e8@fb.com>
Date:   Tue, 30 Aug 2022 09:41:06 -0700
From:   Yonghong Song <yhs@...com>
To:     Hao Luo <haoluo@...gle.com>, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, KP Singh <kpsingh@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        Quentin Monnet <quentin@...valent.com>
Subject: Re: [PATCH bpf-next v1] bpftool: Add support for querying cgroup_iter
 link



On 8/29/22 4:18 PM, Hao Luo wrote:
> Support dumping info of a cgroup_iter link. This includes
> showing the cgroup's id and the order for walking the cgroup
> hierarchy. Example output is as follows:
> 
>> bpftool link show
> 1: iter  prog 2  target_name bpf_map
> 2: iter  prog 3  target_name bpf_prog
> 3: iter  prog 12  target_name cgroup  cgroup_id 72  order self_only
> 
>> bpftool -p link show
> [{
>          "id": 1,
>          "type": "iter",
>          "prog_id": 2,
>          "target_name": "bpf_map"
>      },{
>          "id": 2,
>          "type": "iter",
>          "prog_id": 3,
>          "target_name": "bpf_prog"
>      },{
>          "id": 3,
>          "type": "iter",
>          "prog_id": 12,
>          "target_name": "cgroup",
>          "cgroup_id": 72,
>          "order": "self_only"
>      }
> ]
> 
> Signed-off-by: Hao Luo <haoluo@...gle.com>

Acked-by: Yonghong Song <yhs@...com>