Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752273AbcDTSC2 (ORCPT ); Wed, 20 Apr 2016 14:02:28 -0400 Received: from szxga01-in.huawei.com ([58.251.152.64]:50741 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752103AbcDTSC0 (ORCPT ); Wed, 20 Apr 2016 14:02:26 -0400 From: Wang Nan To: , , CC: , , Wang Nan , Arnaldo Carvalho de Melo , "Alexei Starovoitov" , Jiri Olsa , Li Zefan Subject: [RFC PATCH 01/13] bpf tools: Add map related BPF helper Date: Wed, 20 Apr 2016 18:01:41 +0000 Message-ID: <1461175313-38310-2-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1461175313-38310-1-git-send-email-wangnan0@huawei.com> References: <1461175313-38310-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090204.5717C420.0130,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: e1636fae8dcc0ca17d81e51c6ccd58c4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1820 Lines: 60 Add BPF map helpers so user can read from bpf map in user space. Following commits will introduce user space BPF, bpf_map will be used to pass information between kernel and user BPF programs. Signed-off-by: Wang Nan Cc: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Brendan Gregg Cc: Jiri Olsa Cc: Li Zefan --- tools/lib/bpf/bpf.c | 24 ++++++++++++++++++++++++ tools/lib/bpf/bpf.h | 2 ++ 2 files changed, 26 insertions(+) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 1f91cc9..337d9dc 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -97,3 +97,27 @@ int bpf_map_update_elem(int fd, void *key, void *value, return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); } + +int bpf_map_lookup_elem(int fd, void *key, void *value) +{ + union bpf_attr attr; + + bzero(&attr, sizeof(attr)); + attr.map_fd = fd; + attr.key = ptr_to_u64(key); + attr.value = ptr_to_u64(value); + + return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); +} + +int bpf_map_get_next_key(int fd, void *key, void *next_key) +{ + union bpf_attr attr; + + bzero(&attr, sizeof(attr)); + attr.map_fd = fd; + attr.key = ptr_to_u64(key); + attr.next_key = ptr_to_u64(next_key); + + return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); +} diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index a764655..c06ea21 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -22,4 +22,6 @@ int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns, int bpf_map_update_elem(int fd, void *key, void *value, u64 flags); +int bpf_map_lookup_elem(int fd, void *key, void *value); +int bpf_map_get_next_key(int fd, void *key, void *next_key); #endif -- 1.8.3.4