From patchwork Sat May 9 17:59:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 219546 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B1F3EC54E49 for ; Sat, 9 May 2020 17:59:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 96C20208CA for ; Sat, 9 May 2020 17:59:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="orFieEXJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728743AbgEIR7Z (ORCPT ); Sat, 9 May 2020 13:59:25 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:27576 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728720AbgEIR7W (ORCPT ); Sat, 9 May 2020 13:59:22 -0400 Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 049HuR7p026205 for ; Sat, 9 May 2020 10:59:21 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=2r5VzWCEcS0eYMTCBsdSSoGI4H0lnHK7Kw4E10LqepY=; b=orFieEXJQWVvvtYExEmFlOxlBLMa3P8Fl+aIl/KONw2gfyEG4oPCsHUV7hRFUdfY3cG/ B/GCddvrD7wmpg0iHJhp4W+zYkiJGl210aLUGR+jCOU29WIoPW3hjszNDK4cs8SQY2Hi 2TDnVkuFAiNKvHjt/nKY8DxVE9BTpgOrSak= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 30wsbq1hbu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Sat, 09 May 2020 10:59:21 -0700 Received: from intmgw002.08.frc2.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:11d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1847.3; Sat, 9 May 2020 10:59:20 -0700 Received: by devbig003.ftw2.facebook.com (Postfix, from userid 128203) id 1270E37008E2; Sat, 9 May 2020 10:59:19 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Yonghong Song Smtp-Origin-Hostname: devbig003.ftw2.facebook.com To: Andrii Nakryiko , , Martin KaFai Lau , CC: Alexei Starovoitov , Daniel Borkmann , Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH bpf-next v4 17/21] tools/libpf: add offsetof/container_of macro in bpf_helpers.h Date: Sat, 9 May 2020 10:59:19 -0700 Message-ID: <20200509175919.2477104-1-yhs@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200509175859.2474608-1-yhs@fb.com> References: <20200509175859.2474608-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-09_06:2020-05-08,2020-05-09 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0 bulkscore=0 phishscore=0 clxscore=1015 mlxscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005090155 X-FB-Internal: deliver Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org These two helpers will be used later in bpf_iter bpf program bpf_iter_netlink.c. Put them in bpf_helpers.h since they could be useful in other cases. Acked-by: Andrii Nakryiko Signed-off-by: Yonghong Song --- tools/lib/bpf/bpf_helpers.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h index da00b87aa199..f67dce2af802 100644 --- a/tools/lib/bpf/bpf_helpers.h +++ b/tools/lib/bpf/bpf_helpers.h @@ -36,6 +36,20 @@ #define __weak __attribute__((weak)) #endif +/* + * Helper macro to manipulate data structures + */ +#ifndef offsetof +#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER) +#endif +#ifndef container_of +#define container_of(ptr, type, member) \ + ({ \ + void *__mptr = (void *)(ptr); \ + ((type *)(__mptr - offsetof(type, member))); \ + }) +#endif + /* * Helper structure used by eBPF C program * to describe BPF map attributes to libbpf loader