From patchwork Mon Mar 28 17:50:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12794069 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 4C83DC43217 for ; Mon, 28 Mar 2022 17:53:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244808AbiC1Ry4 (ORCPT ); Mon, 28 Mar 2022 13:54:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36994 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244836AbiC1Ryj (ORCPT ); Mon, 28 Mar 2022 13:54:39 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 64C6E65796; Mon, 28 Mar 2022 10:52:29 -0700 (PDT) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4KS0bd1xkWz67PnL; Tue, 29 Mar 2022 01:50:37 +0800 (CST) Received: from roberto-ThinkStation-P620.huawei.com (10.204.63.22) by fraeml714-chm.china.huawei.com (10.206.15.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 28 Mar 2022 19:52:26 +0200 From: Roberto Sassu To: , , , , , , , , , CC: , , , , , , , , , , Roberto Sassu Subject: [PATCH 06/18] bpf-preload: Generate free_objs_and_skel() Date: Mon, 28 Mar 2022 19:50:21 +0200 Message-ID: <20220328175033.2437312-7-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220328175033.2437312-1-roberto.sassu@huawei.com> References: <20220328175033.2437312-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml754-chm.china.huawei.com (10.201.108.204) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Generate free_objs_and_skel() (renamed from free_links_and_skel()) to decrease the reference count of pinned objects, and to destroy the skeleton. Signed-off-by: Roberto Sassu --- kernel/bpf/preload/bpf_preload_kern.c | 13 ++------- .../bpf/preload/iterators/iterators.lskel.h | 10 +++++++ tools/bpf/bpftool/gen.c | 28 +++++++++++++++++++ 3 files changed, 40 insertions(+), 11 deletions(-) diff --git a/kernel/bpf/preload/bpf_preload_kern.c b/kernel/bpf/preload/bpf_preload_kern.c index 485589e03bd2..8b49beb2b2d6 100644 --- a/kernel/bpf/preload/bpf_preload_kern.c +++ b/kernel/bpf/preload/bpf_preload_kern.c @@ -5,15 +5,6 @@ #include #include "iterators/iterators.lskel.h" -static void free_links_and_skel(void) -{ - if (!IS_ERR_OR_NULL(dump_bpf_map_link)) - bpf_link_put(dump_bpf_map_link); - if (!IS_ERR_OR_NULL(dump_bpf_prog_link)) - bpf_link_put(dump_bpf_prog_link); - iterators_bpf__destroy(skel); -} - static int preload(struct dentry *parent) { int err; @@ -75,7 +66,7 @@ static int load_skel(void) skel->links.dump_bpf_prog_fd = 0; return 0; out: - free_links_and_skel(); + free_objs_and_skel(); return err; } @@ -93,7 +84,7 @@ static int __init load(void) static void __exit fini(void) { bpf_preload_ops = NULL; - free_links_and_skel(); + free_objs_and_skel(); } late_initcall(load); module_exit(fini); diff --git a/kernel/bpf/preload/iterators/iterators.lskel.h b/kernel/bpf/preload/iterators/iterators.lskel.h index 9794acdfacf9..4afd983ad40e 100644 --- a/kernel/bpf/preload/iterators/iterators.lskel.h +++ b/kernel/bpf/preload/iterators/iterators.lskel.h @@ -438,4 +438,14 @@ static struct bpf_link *dump_bpf_map_link; static struct bpf_link *dump_bpf_prog_link; static struct iterators_bpf *skel; +static void free_objs_and_skel(void) +{ + if (!IS_ERR_OR_NULL(dump_bpf_map_link)) + bpf_link_put(dump_bpf_map_link); + if (!IS_ERR_OR_NULL(dump_bpf_prog_link)) + bpf_link_put(dump_bpf_prog_link); + + iterators_bpf__destroy(skel); +} + #endif /* __ITERATORS_BPF_SKEL_H__ */ diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c index c62c4c65b631..e167aa092b7f 100644 --- a/tools/bpf/bpftool/gen.c +++ b/tools/bpf/bpftool/gen.c @@ -674,6 +674,33 @@ static void codegen_preload_vars(struct bpf_object *obj, const char *obj_name) ", obj_name); } +static void codegen_preload_free(struct bpf_object *obj, const char *obj_name) +{ + struct bpf_program *prog; + + codegen("\ + \n\ + \n\ + static void free_objs_and_skel(void) \n\ + { \n\ + "); + + bpf_object__for_each_program(prog, obj) { + codegen("\ + \n\ + if (!IS_ERR_OR_NULL(%1$s_link)) \n\ + bpf_link_put(%1$s_link); \n\ + ", bpf_program__name(prog)); + } + + codegen("\ + \n\ + \n\ + %s__destroy(skel); \n\ + } \n\ + ", obj_name); +} + static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *header_guard) { DECLARE_LIBBPF_OPTS(gen_loader_opts, opts); @@ -824,6 +851,7 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h if (gen_preload_methods) { codegen_preload_vars(obj, obj_name); + codegen_preload_free(obj, obj_name); } codegen("\