From nobody Tue Apr 7 09:05:36 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8D39ECAAD2 for ; Mon, 29 Aug 2022 23:18:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229647AbiH2XSg (ORCPT ); Mon, 29 Aug 2022 19:18:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59670 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229535AbiH2XSe (ORCPT ); Mon, 29 Aug 2022 19:18:34 -0400 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5C71C7FE6A for ; Mon, 29 Aug 2022 16:18:33 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-340e618b145so82181277b3.2 for ; Mon, 29 Aug 2022 16:18:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc; bh=0lhafXj2iVGO0xHQkpT9DZ5Z9AK3RgqVp2dka9M0juU=; b=X6QrVWknF21loz5DsyEEHlL9TrT4PTGpWOX7oyi4kYvKaRKJJ0N7PSqk69cFjbIrsF ZSiloccWVc8EAwuuvR7o1+vATxAYqpraU2FJGv9yJSl/9in72zezG4RddKNK/w7tfled dSvqtYpvz/w+/o8t7+7tZpjOScqnoT3KqIXsUaBlapICH/wfYOinQGVG8D10Q1kfS47c iOkmioyaN9ls2NeNVRz6xsJfM5fGRfoKpGgLQigtk1F8fvSMMlGWXi36rGuSsqtdXgv6 wyFuzTmhSjcGJW0HJMsIQP68MBdzPm+vBgTuzVKLDL73JuFCJB/CEiDZ7mr079OoZagu sAkA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc; bh=0lhafXj2iVGO0xHQkpT9DZ5Z9AK3RgqVp2dka9M0juU=; b=M+nXTzrxWvS9qp7jvvJUQ1yjJ0FE9zUxDiSiOdbF1HE/yggui6uMgCa1zlqt01hP5F fP5VYbvmnsDHgQDv7loYxk4bWpJhhyKYcIRvTdAXaK+Y4u75ZGAqW7vATSmcKteY7+9P CAzlg/nrq9q8okR+hQqqc14TxRhu6qAaaZaKVOMJ6H5UbW3O+5EJR9+VWHmYxlFeumJK BdONHJVb3EAk/1EgYQCCL4DBo/wg85m1/3FOCNKpocxEhHYFa+dfvjZ7JazAI38oC+Qj fbbesAUjTyaLoTuuBr+nHGiqtRiiYjIIjbZGLsIrqxxrQrFoq4NlaK/sFlVyVghXmVCn 4ACA== X-Gm-Message-State: ACgBeo1BgXt+XdzPhLi8ameCvGaLtUz6HOdoSJ8JQ7h4RnWkpPnTzAQz UjETkFAvCxrYynn+nNQx55BXx33dBZ/4UiiTK4XOzr6opfpgleCZloy/+vwIYkIPsPGFXXJRI1k v6RmJnV4PpKA8BHF0AdjRBXNhtk51r2+t8ZmcVfEY2s1u708wRdpXA0QJyBeBGxmZ4NRfhQ== X-Google-Smtp-Source: AA6agR5UJdH5HnV9NGjkFnupHjUrC1l+Gwz4Yi7D3ZklLgd6M0+8CTOt0eyZRsWeEl8mKfDkn9YMU4RhW3c= X-Received: from haoluo.svl.corp.google.com ([2620:15c:2d4:203:3698:5104:9e22:e494]) (user=haoluo job=sendgmr) by 2002:a0d:c1c4:0:b0:330:4891:be97 with SMTP id c187-20020a0dc1c4000000b003304891be97mr11529426ywd.465.1661815112615; Mon, 29 Aug 2022 16:18:32 -0700 (PDT) Date: Mon, 29 Aug 2022 16:18:28 -0700 Mime-Version: 1.0 X-Mailer: git-send-email 2.37.2.672.g94769d06f0-goog Message-ID: <20220829231828.1016835-1-haoluo@google.com> Subject: [PATCH bpf-next v1] bpftool: Add support for querying cgroup_iter link From: Hao Luo To: linux-kernel@vger.kernel.org, bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , KP Singh , John Fastabend , Stanislav Fomichev , Jiri Olsa , Yosry Ahmed , Quentin Monnet , Hao Luo Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Acked-by: Yonghong Song Reviewed-by: Quentin Monnet --- tools/bpf/bpftool/link.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c index 7a20931c3250..9e8d14d0114d 100644 --- a/tools/bpf/bpftool/link.c +++ b/tools/bpf/bpftool/link.c @@ -83,6 +83,29 @@ static bool is_iter_map_target(const char *target_name) strcmp(target_name, "bpf_sk_storage_map") =3D=3D 0; } =20 +static bool is_iter_cgroup_target(const char *target_name) +{ + return strcmp(target_name, "cgroup") =3D=3D 0; +} + +static const char *cgroup_order_string(__u32 order) +{ + switch (order) { + case BPF_CGROUP_ITER_ORDER_UNSPEC: + return "order_unspec"; + case BPF_CGROUP_ITER_SELF_ONLY: + return "self_only"; + case BPF_CGROUP_ITER_DESCENDANTS_PRE: + return "descendants_pre"; + case BPF_CGROUP_ITER_DESCENDANTS_POST: + return "descendants_post"; + case BPF_CGROUP_ITER_ANCESTORS_UP: + return "ancestors_up"; + default: /* won't happen */ + return ""; + } +} + static void show_iter_json(struct bpf_link_info *info, json_writer_t *wtr) { const char *target_name =3D u64_to_ptr(info->iter.target_name); @@ -91,6 +114,12 @@ static void show_iter_json(struct bpf_link_info *info, = json_writer_t *wtr) =20 if (is_iter_map_target(target_name)) jsonw_uint_field(wtr, "map_id", info->iter.map.map_id); + + if (is_iter_cgroup_target(target_name)) { + jsonw_lluint_field(wtr, "cgroup_id", info->iter.cgroup.cgroup_id); + jsonw_string_field(wtr, "order", + cgroup_order_string(info->iter.cgroup.order)); + } } =20 static int get_prog_info(int prog_id, struct bpf_prog_info *info) @@ -208,6 +237,12 @@ static void show_iter_plain(struct bpf_link_info *info) =20 if (is_iter_map_target(target_name)) printf("map_id %u ", info->iter.map.map_id); + + if (is_iter_cgroup_target(target_name)) { + printf("cgroup_id %llu ", info->iter.cgroup.cgroup_id); + printf("order %s ", + cgroup_order_string(info->iter.cgroup.order)); + } } =20 static int show_link_close_plain(int fd, struct bpf_link_info *info) --=20 2.37.2.672.g94769d06f0-goog