From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753121AbbC1LkQ (ORCPT <rfc822;w@1wt.eu>);
	Sat, 28 Mar 2015 07:40:16 -0400
Received: from szxga03-in.huawei.com ([119.145.14.66]:26178 "EHLO
	szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752057AbbC1LkM (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Sat, 28 Mar 2015 07:40:12 -0400
Message-ID: <55169240.7040103@huawei.com>
Date: Sat, 28 Mar 2015 19:36:32 +0800
From: He Kuang <hekuang@huawei.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0
MIME-Version: 1.0
To: "ast@plumgrid.com >> Alexei Starovoitov" <ast@plumgrid.com>
CC: <wangnan0@huawei.com>,
        "linux-kernel@vger.kernel.org >> LKML" <linux-kernel@vger.kernel.org>
Subject: [RFC] bpf: Suggestion on bpf syscall interface
Content-Type: text/plain; charset="UTF-8"; format=flowed
Content-Transfer-Encoding: 7bit
X-Originating-IP: [10.110.54.65]
X-CFilter-Loop: Reflected
X-Mirapoint-Virus-RAPID-Raw: score=unknown(0),
	refid=str=0001.0A020206.55169256.0106,ss=1,re=0.001,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0,
	ip=0.0.0.0,
	so=2013-05-26 15:14:31,
	dmn=2013-03-21 17:37:32
X-Mirapoint-Loop-Id: 320fa2be7d7250ea7bb3819c0ff772f1
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hi, Alexei

In our end-end IO module project, we use bpf maps to record
configurations. According to current bpf syscall interface, we
should specify map_fd to lookup/update bpf maps, so we are
restricted to do config in the same user program.

My suggestion is to export this kind of operations to sysfs, so
we can load&attach bpf progs and config it seperately. We
implement this feature in our demo project. What's your opinion
on this?