From patchwork Thu Nov 24 15:15:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 628471 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 095FCC46467 for ; Thu, 24 Nov 2022 15:18:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229944AbiKXPSH (ORCPT ); Thu, 24 Nov 2022 10:18:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229937AbiKXPSC (ORCPT ); Thu, 24 Nov 2022 10:18:02 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1BCA81609DA for ; Thu, 24 Nov 2022 07:16:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1669302975; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KAJYIVS7w3VHw6GPJCxv8d/p+6Nx7C8D/UTcdk+DlLc=; b=E72kW2PkeKR4fI+wL689/nMls4h0qvTzspRPJJ3lpzXAy0BEOW+YMrMkxeIWYDkwMx4RKV pjKMbOLDlLZXOulA9rvn+TCs0tC4pLFvJXyeMlpOKn2jMYXKx36UFxWj7l9DAgLmqQcse6 ubtVQaC9nYzlu1XZdyqMkyhUDNyqC8c= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-422-HPzI6D8PNnm5Bc0Sqkuylw-1; Thu, 24 Nov 2022 10:16:12 -0500 X-MC-Unique: HPzI6D8PNnm5Bc0Sqkuylw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8C61E29AB3F2; Thu, 24 Nov 2022 15:16:11 +0000 (UTC) Received: from plouf.redhat.com (unknown [10.39.193.200]) by smtp.corp.redhat.com (Postfix) with ESMTP id CE91640C2064; Thu, 24 Nov 2022 15:16:09 +0000 (UTC) From: Benjamin Tissoires To: Greg KH , Jiri Kosina , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Dmitry Torokhov Cc: Tero Kristo , linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, Benjamin Tissoires Subject: [RFC hid v1 01/10] bpftool: generate json output of skeletons Date: Thu, 24 Nov 2022 16:15:54 +0100 Message-Id: <20221124151603.807536-2-benjamin.tissoires@redhat.com> In-Reply-To: <20221124151603.807536-1-benjamin.tissoires@redhat.com> References: <20221124151603.807536-1-benjamin.tissoires@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org So we can then build light skeletons with loaders in any language. Signed-off-by: Benjamin Tissoires --- tools/bpf/bpftool/gen.c | 95 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c index cf8b4e525c88..818a5209b3ac 100644 --- a/tools/bpf/bpftool/gen.c +++ b/tools/bpf/bpftool/gen.c @@ -904,6 +904,96 @@ codegen_progs_skeleton(struct bpf_object *obj, size_t prog_cnt, bool populate_li } } +static int gen_json(struct bpf_object *obj, const char *obj_name, size_t file_sz, uint8_t *obj_data) +{ + struct bpf_program *prog; + struct bpf_map *map; + char ident[256]; + + jsonw_start_object(json_wtr); /* root object */ + + jsonw_string_field(json_wtr, "name", obj_name); + + jsonw_bool_field(json_wtr, "use_loader", use_loader); + + /* print all maps */ + jsonw_name(json_wtr, "maps"); + jsonw_start_array(json_wtr); + bpf_object__for_each_map(map, obj) { + if (!get_map_ident(map, ident, sizeof(ident))) { + p_err("ignoring unrecognized internal map '%s'...", + bpf_map__name(map)); + continue; + } + + jsonw_start_object(json_wtr); /* map object */ + jsonw_string_field(json_wtr, "ident", ident); + jsonw_string_field(json_wtr, "name", bpf_map__name(map)); + + /* print mmap data value */ + if (is_internal_mmapable_map(map, ident, sizeof(ident))) { + const void *mmap_data = NULL; + size_t mmap_size = 0; + + mmap_data = bpf_map__initial_value(map, &mmap_size); + + jsonw_uint_field(json_wtr, "size", mmap_size); + jsonw_uint_field(json_wtr, "mmap_sz", bpf_map_mmap_sz(map)); + jsonw_name(json_wtr, "data"); + print_hex_data_json((uint8_t *)mmap_data, mmap_size); + + } + jsonw_end_object(json_wtr); /* map object */ + } + jsonw_end_array(json_wtr); + + /* print all progs */ + jsonw_name(json_wtr, "progs"); + jsonw_start_array(json_wtr); + bpf_object__for_each_program(prog, obj) { + jsonw_start_object(json_wtr); /* prog object */ + jsonw_string_field(json_wtr, "name", bpf_program__name(prog)); + jsonw_string_field(json_wtr, "sec", bpf_program__section_name(prog)); + jsonw_end_object(json_wtr); /* prog object */ + } + jsonw_end_array(json_wtr); + + /* print object data */ + if (use_loader) { + DECLARE_LIBBPF_OPTS(gen_loader_opts, opts); + int err = 0; + + err = bpf_object__gen_loader(obj, &opts); + if (err) + return err; + + err = bpf_object__load(obj); + if (err) { + p_err("failed to load object file"); + return err; + } + /* If there was no error during load then gen_loader_opts + * are populated with the loader program. + */ + + jsonw_uint_field(json_wtr, "data_sz", opts.data_sz); + jsonw_name(json_wtr, "data"); + print_hex_data_json((uint8_t *)opts.data, opts.data_sz); + + jsonw_uint_field(json_wtr, "insns_sz", opts.insns_sz); + jsonw_name(json_wtr, "insns"); + print_hex_data_json((uint8_t *)opts.insns, opts.insns_sz); + + } else { + jsonw_name(json_wtr, "data"); + print_hex_data_json(obj_data, file_sz); + } + + jsonw_end_object(json_wtr); /* root object */ + + return 0; +} + static int do_skeleton(int argc, char **argv) { char header_guard[MAX_OBJ_NAME_LEN + sizeof("__SKEL_H__")]; @@ -986,6 +1076,11 @@ static int do_skeleton(int argc, char **argv) goto out; } + if (json_output) { + err = gen_json(obj, obj_name, file_sz, (uint8_t *)obj_data); + goto out; + } + bpf_object__for_each_map(map, obj) { if (!get_map_ident(map, ident, sizeof(ident))) { p_err("ignoring unrecognized internal map '%s'...",