From mboxrd@z Thu Jan 1 00:00:00 1970 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=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no 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 976EAC43331 for ; Wed, 13 Nov 2019 03:32:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D515222C1 for ; Wed, 13 Nov 2019 03:32:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="JwC4IZkd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727053AbfKMDcN (ORCPT ); Tue, 12 Nov 2019 22:32:13 -0500 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:18882 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726953AbfKMDcM (ORCPT ); Tue, 12 Nov 2019 22:32:12 -0500 Received: from pps.filterd (m0148460.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id xAD39Ket025066 for ; Tue, 12 Nov 2019 19:15:24 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=facebook; bh=sjvxiTL/ckYkzroQxbAPNyW+qzPGBEdDamqyHnjH28Y=; b=JwC4IZkdcKL5K2SIwYgjmqqy1n+FDg0JaPoRqHw/uuj/YjvYvKw2L2wL0GRzRyNsYXdQ gZVBMgFGakdIKIWKkHBjCr5xYwPxwTMBASmNpp3snPs20bVTvlg8UyZu1O4EwthYtrtq C2rGsszLOkMVLxhnaFNoEQvOJVI/JuzYHas= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 2w7prddry6-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 12 Nov 2019 19:15:24 -0800 Received: from 2401:db00:2050:5102:face:0:3b:0 (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::c) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Tue, 12 Nov 2019 19:15:23 -0800 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id 08FC02EC1B1D; Tue, 12 Nov 2019 19:15:22 -0800 (PST) Smtp-Origin-Hostprefix: devbig From: Andrii Nakryiko Smtp-Origin-Hostname: devbig012.ftw2.facebook.com To: , , , CC: , , Andrii Nakryiko Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH v3 bpf-next 0/3] Add support for memory-mapping BPF array maps Date: Tue, 12 Nov 2019 19:15:15 -0800 Message-ID: <20191113031518.155618-1-andriin@fb.com> X-Mailer: git-send-email 2.17.1 X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-11-12_10:2019-11-11,2019-11-12 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 phishscore=0 lowpriorityscore=0 spamscore=0 bulkscore=0 impostorscore=0 malwarescore=0 mlxlogscore=464 adultscore=0 suspectscore=8 mlxscore=0 clxscore=1015 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1911130026 X-FB-Internal: deliver Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This patch set adds ability to memory-map BPF array maps (single- and multi-element). The primary use case is memory-mapping BPF array maps, created to back global data variables, created by libbpf implicitly. This allows for much better usability, along with avoiding syscalls to read or update data completely. Due to memory-mapping requirements, BPF array map that is supposed to be memory-mapped, has to be created with special BPF_F_MMAPABLE attribute, which triggers slightly different memory allocation strategy internally. See patch 1 for details. Libbpf is extended to detect kernel support for this flag, and if supported, will specify it for all global data maps automatically. v2->v3: - change allocation strategy to avoid extra pointer dereference (Jakub); v1->v2: - fix map lookup code generation for BPF_F_MMAPABLE case; - prevent BPF_F_MMAPABLE flag for all but plain array map type; - centralize ref-counting in generic bpf_map_mmap(); - don't use uref counting (Alexei); - use vfree() directly; - print flags with %x (Song); - extend tests to verify bpf_map_{lookup,update}_elem() logic as well. Andrii Nakryiko (3): bpf: add mmap() support for BPF_MAP_TYPE_ARRAY libbpf: make global data internal arrays mmap()-able, if possible selftests/bpf: add BPF_TYPE_MAP_ARRAY mmap() tests include/linux/bpf.h | 6 +- include/uapi/linux/bpf.h | 3 + kernel/bpf/arraymap.c | 93 +++++++++- kernel/bpf/syscall.c | 47 +++++ tools/include/uapi/linux/bpf.h | 3 + tools/lib/bpf/libbpf.c | 32 +++- .../selftests/bpf/prog_tests/core_reloc.c | 45 +++-- tools/testing/selftests/bpf/prog_tests/mmap.c | 170 ++++++++++++++++++ tools/testing/selftests/bpf/progs/test_mmap.c | 41 +++++ 9 files changed, 413 insertions(+), 27 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/mmap.c create mode 100644 tools/testing/selftests/bpf/progs/test_mmap.c -- 2.17.1