Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754233AbbK0Hrm (ORCPT ); Fri, 27 Nov 2015 02:47:42 -0500 Received: from terminus.zytor.com ([198.137.202.10]:42505 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751853AbbK0Hri (ORCPT ); Fri, 27 Nov 2015 02:47:38 -0500 Date: Thu, 26 Nov 2015 23:47:21 -0800 From: tip-bot for He Kuang Message-ID: Cc: hekuang@huawei.com, linux-kernel@vger.kernel.org, masami.hiramatsu.pt@hitachi.com, ast@kernel.org, lizefan@huawei.com, wangnan0@huawei.com, namhyung@kernel.org, acme@redhat.com, tglx@linutronix.de, mingo@kernel.org, hpa@zytor.com Reply-To: hekuang@huawei.com, linux-kernel@vger.kernel.org, ast@kernel.org, masami.hiramatsu.pt@hitachi.com, wangnan0@huawei.com, namhyung@kernel.org, lizefan@huawei.com, acme@redhat.com, tglx@linutronix.de, hpa@zytor.com, mingo@kernel.org In-Reply-To: <1448372181-151723-4-git-send-email-wangnan0@huawei.com> References: <1448372181-151723-4-git-send-email-wangnan0@huawei.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] bpf tools: Add helper function for updating bpf maps elements Git-Commit-ID: 43798bf37215fe242e592fd4605d804e2da0781b X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2365 Lines: 66 Commit-ID: 43798bf37215fe242e592fd4605d804e2da0781b Gitweb: http://git.kernel.org/tip/43798bf37215fe242e592fd4605d804e2da0781b Author: He Kuang AuthorDate: Tue, 24 Nov 2015 13:36:08 +0000 Committer: Arnaldo Carvalho de Melo CommitDate: Thu, 26 Nov 2015 17:21:24 -0300 bpf tools: Add helper function for updating bpf maps elements Add bpf_map_update_elem() helper function which calls the sys_bpf syscall to update elements in bpf maps. Upcoming patches will use it to adjust data in map through the perf command line. Signed-off-by: He Kuang Cc: Alexei Starovoitov Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Wang Nan Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1448372181-151723-4-git-send-email-wangnan0@huawei.com Signed-off-by: Wang Nan Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/bpf/bpf.c | 14 ++++++++++++++ tools/lib/bpf/bpf.h | 2 ++ 2 files changed, 16 insertions(+) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index a633105..5bdc6ea 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -83,3 +83,17 @@ int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns, log_buf[0] = 0; return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); } + +int bpf_map_update_elem(int fd, void *key, void *value, + u64 flags) +{ + union bpf_attr attr; + + bzero(&attr, sizeof(attr)); + attr.map_fd = fd; + attr.key = ptr_to_u64(key); + attr.value = ptr_to_u64(value); + attr.flags = flags; + + return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); +} diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index 854b736..a764655 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -20,4 +20,6 @@ int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns, u32 kern_version, char *log_buf, size_t log_buf_sz); +int bpf_map_update_elem(int fd, void *key, void *value, + u64 flags); #endif -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/