From patchwork Wed Jun 29 14:40:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Quentin Monnet X-Patchwork-Id: 12900223 X-Patchwork-Delegate: bpf@iogearbox.net 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 6C8A0C433EF for ; Wed, 29 Jun 2022 14:40:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233536AbiF2Oke (ORCPT ); Wed, 29 Jun 2022 10:40:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45622 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233210AbiF2Oka (ORCPT ); Wed, 29 Jun 2022 10:40:30 -0400 Received: from mail-wm1-x332.google.com (mail-wm1-x332.google.com [IPv6:2a00:1450:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 522F7381B1 for ; Wed, 29 Jun 2022 07:40:29 -0700 (PDT) Received: by mail-wm1-x332.google.com with SMTP id be14-20020a05600c1e8e00b003a04a458c54so5746163wmb.3 for ; Wed, 29 Jun 2022 07:40:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isovalent-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=V65gkuE95550YJjRx52ZjJytf4+TcCOGZdYdBtsFvhc=; b=vX4ShwjGvrk9MOmVyJ3jUHJJrtHwGoe4FOjValwtSMFK9XUIFvlkdbRP9YkzON9vMH Yc8bxRBklEivhx00BExdaSi8rxCG+yJZrWkUeAtctQJAbU46d8lxQY6zTfSkx0KItj3J gSMu3ZgdXvQKpYj3gafycCTYSwsAqMyrxqAfEg1R6D8Hz3zrEL6hRrVTt7T9X9P07jYh /PO2JVie1/KGtgLxFgSKV0GRjgQjyyhf24/LKU6vZdDD2epYBmuQZ4b8l/mXYEp3SK97 4zxQT4O8OmWzOQCmIVdCqorZ620wfzqgIlzUIseDXggcRXoMttbZrtUefk1klmFyQVEq 7kUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=V65gkuE95550YJjRx52ZjJytf4+TcCOGZdYdBtsFvhc=; b=w+/xWdanEZJtRxiFCEntq6reQBmZ652UY7QF1PQa6/a6qe4lCKt5jfFIseb6Vjr+kE SWbhCgRC0/7sWdnedFaybVRxylNGSGy/cJ3eO0g9UybTt14DRLdl8GrJa9owdJYDCLkF Vhy5PlzeH8YbYRmCPugjQqwQDeqVpLfUSTC6ynTAeOFjjveJgVrA8YDufUNbS9SNkc2L hk9vxpq6NMcXkfx9EG8iSYLNzydekgh11Kg/X9G885cD3R3sHsdXJOiLq8YlS18a7HhB BDFoFPk7n5d6qb7ZML048IgDaYHMWfsgFWyCUvHQ2W3iTEXf00Wcn8gVG/tH3Dhq0glM vS0Q== X-Gm-Message-State: AJIora/NhIFMYxxMLQh8BhAdFo2qfXxUh5OEFCpaxWEVjNtWdCjhmUAo h4YLUcLdTZwBT/0AiVRhZFnM5Q== X-Google-Smtp-Source: AGRyM1vFrdNOO1W1iP+svLoZp0KNPnk5wqaeZV8Ngy2dYy/O/JWOpUUJ915KM7HCTodUvWzdZRoPBA== X-Received: by 2002:a05:600c:3542:b0:3a1:6855:1153 with SMTP id i2-20020a05600c354200b003a168551153mr3919943wmq.121.1656513627850; Wed, 29 Jun 2022 07:40:27 -0700 (PDT) Received: from harfang.fritz.box ([51.155.200.13]) by smtp.gmail.com with ESMTPSA id h13-20020adff4cd000000b002103aebe8absm16770518wrp.93.2022.06.29.07.40.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jun 2022 07:40:27 -0700 (PDT) From: Quentin Monnet To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , bpf@vger.kernel.org, netdev@vger.kernel.org, Quentin Monnet Subject: [PATCH bpf-next 1/2] bpftool: Add feature list (prog/map/link/attach types, helpers) Date: Wed, 29 Jun 2022 15:40:18 +0100 Message-Id: <20220629144019.75181-2-quentin@isovalent.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220629144019.75181-1-quentin@isovalent.com> References: <20220629144019.75181-1-quentin@isovalent.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Add a "bpftool feature list" subcommand to list BPF "features". Contrarily to "bpftool feature probe", this is not about the features available on the system. Instead, it lists all features known to bpftool from compilation time; in other words, all program, map, attach, link types known to the libbpf version in use, and all helpers found in the UAPI BPF header. The first use case for this feature is bash completion: running the command provides a list of types that can be used to produce the list of candidate map types, for example. Now that bpftool uses "standard" names provided by libbpf for the program, map, link, and attach types, having the ability to list these types and helpers could also be useful in scripts to loop over existing items. Sample output: # bpftool feature list prog_types | grep -vw unspec | head -n 6 socket_filter kprobe sched_cls sched_act tracepoint xdp # bpftool -p feature list map_types | jq '.[1]' "hash" # bpftool feature list attach_types | grep '^cgroup_' cgroup_inet_ingress cgroup_inet_egress [...] cgroup_inet_sock_release # bpftool feature list helpers | grep -vw bpf_unspec | wc -l 207 The "unspec" types and helpers are not filtered out by bpftool, so as to remain closer to the enums, and to preserve the indices in the JSON arrays (e.g. "hash" at index 1 == BPF_MAP_TYPE_HASH in map types list). Signed-off-by: Quentin Monnet Acked-by: Daniel Müller --- .../bpftool/Documentation/bpftool-feature.rst | 12 ++++ tools/bpf/bpftool/bash-completion/bpftool | 7 ++- tools/bpf/bpftool/feature.c | 55 +++++++++++++++++++ 3 files changed, 73 insertions(+), 1 deletion(-) diff --git a/tools/bpf/bpftool/Documentation/bpftool-feature.rst b/tools/bpf/bpftool/Documentation/bpftool-feature.rst index 4ce9a77bc1e0..4bf1724d0e8c 100644 --- a/tools/bpf/bpftool/Documentation/bpftool-feature.rst +++ b/tools/bpf/bpftool/Documentation/bpftool-feature.rst @@ -24,9 +24,11 @@ FEATURE COMMANDS ================ | **bpftool** **feature probe** [*COMPONENT*] [**full**] [**unprivileged**] [**macros** [**prefix** *PREFIX*]] +| **bpftool** **feature list** *GROUP* | **bpftool** **feature help** | | *COMPONENT* := { **kernel** | **dev** *NAME* } +| *GROUP* := { **prog_types** | **map_types** | **attach_types** | **helpers** } DESCRIPTION =========== @@ -70,6 +72,16 @@ DESCRIPTION The keywords **full**, **macros** and **prefix** have the same role as when probing the kernel. + **bpftool feature list** *GROUP* + List items known to bpftool. These can be BPF program types + (**prog_types**), BPF map types (**map_types**), attach types + (**attach_types**), link types (**link_types**), or BPF helper + functions (**helpers**). The command does not probe the system, but + simply lists the elements that bpftool knows from compilation time, + as provided from libbpf (for all object types) or from the BPF UAPI + header (list of helpers). This can be used in scripts to iterate over + BPF types or helpers. + **bpftool feature help** Print short help message. diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool index 91f89a9a5b36..9cef6516320b 100644 --- a/tools/bpf/bpftool/bash-completion/bpftool +++ b/tools/bpf/bpftool/bash-completion/bpftool @@ -1175,9 +1175,14 @@ _bpftool() _bpftool_once_attr 'full unprivileged' return 0 ;; + list) + [[ $prev != "$command" ]] && return 0 + COMPREPLY=( $( compgen -W 'prog_types map_types \ + attach_types link_types helpers' -- "$cur" ) ) + ;; *) [[ $prev == $object ]] && \ - COMPREPLY=( $( compgen -W 'help probe' -- "$cur" ) ) + COMPREPLY=( $( compgen -W 'help list probe' -- "$cur" ) ) ;; esac ;; diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c index bac4ef428a02..576cc6b90c6a 100644 --- a/tools/bpf/bpftool/feature.c +++ b/tools/bpf/bpftool/feature.c @@ -1258,6 +1258,58 @@ static int do_probe(int argc, char **argv) return 0; } +static const char *get_helper_name(unsigned int id) +{ + if (id >= ARRAY_SIZE(helper_name)) + return NULL; + + return helper_name[id]; +} + +static int do_list(int argc, char **argv) +{ + const char *(*get_name)(unsigned int id); + unsigned int id = 0; + + if (argc < 1) + usage(); + + if (is_prefix(*argv, "prog_types")) { + get_name = (const char *(*)(unsigned int))libbpf_bpf_prog_type_str; + } else if (is_prefix(*argv, "map_types")) { + get_name = (const char *(*)(unsigned int))libbpf_bpf_map_type_str; + } else if (is_prefix(*argv, "attach_types")) { + get_name = (const char *(*)(unsigned int))libbpf_bpf_attach_type_str; + } else if (is_prefix(*argv, "link_types")) { + get_name = (const char *(*)(unsigned int))libbpf_bpf_link_type_str; + } else if (is_prefix(*argv, "helpers")) { + get_name = get_helper_name; + } else { + p_err("expected 'prog_types', 'map_types', 'attach_types', 'link_types' or 'helpers', got: %s", *argv); + return -1; + } + + if (json_output) + jsonw_start_array(json_wtr); /* root array */ + + while (true) { + const char *name; + + name = get_name(id++); + if (!name) + break; + if (json_output) + jsonw_string(json_wtr, name); + else + printf("%s\n", name); + } + + if (json_output) + jsonw_end_array(json_wtr); /* root array */ + + return 0; +} + static int do_help(int argc, char **argv) { if (json_output) { @@ -1267,9 +1319,11 @@ static int do_help(int argc, char **argv) fprintf(stderr, "Usage: %1$s %2$s probe [COMPONENT] [full] [unprivileged] [macros [prefix PREFIX]]\n" + " %1$s %2$s list GROUP\n" " %1$s %2$s help\n" "\n" " COMPONENT := { kernel | dev NAME }\n" + " GROUP := { prog_types | map_types | attach_types | link_types | helpers }\n" " " HELP_SPEC_OPTIONS " }\n" "", bin_name, argv[-2]); @@ -1279,6 +1333,7 @@ static int do_help(int argc, char **argv) static const struct cmd cmds[] = { { "probe", do_probe }, + { "list", do_list }, { "help", do_help }, { 0 } };