From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58]) by dpdk.org (Postfix) with ESMTP id 64ACA5919 for ; Thu, 17 Apr 2014 13:06:16 +0200 (CEST) Received: from hmsreliant.think-freely.org ([2001:470:8:a08:7aac:c0ff:fec2:933b] helo=localhost) by smtp.tuxdriver.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.63) (envelope-from ) id 1Wak8w-0007D9-So; Thu, 17 Apr 2014 07:06:16 -0400 Date: Thu, 17 Apr 2014 07:06:10 -0400 From: Neil Horman To: Tomas Vestelind Message-ID: <20140417110610.GD13715@hmsreliant.think-freely.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-Score: -2.9 (--) X-Spam-Status: No Cc: "dev@dpdk.org" Subject: Re: [dpdk-dev] Calling rte_eal_init multiple times in the same process X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Apr 2014 11:06:16 -0000 On Thu, Apr 17, 2014 at 09:09:44AM +0000, Tomas Vestelind wrote: > Dear all, > > I'm not sure who to address with this email so I'll just present my problem and my suggested solution. > > The problem I'm facing is that I need to do rte_eal_init serveral times in the same process. The reason for this is mostly architectural as we want to divide certain functionality in to different, implementation independent, modules in which DPDK would be used for different purposes. Thus we would need to eventually call rte_eal_init several times because we can't say for sure if it has been called by another module or not. > > While thinking about it I saw no good, existing solution to this (I might have missed it though). Would returning a "DPDK has already been initialized" error code in rte_eal_init be a good way to go about it? I haven't done this yet but I could probably provide a patch if it's interesting. > > Thank you for your time and a very nice framework with good documentation! > > BR, > Tomas > You already (more or less) have that. rte_eal_init panics or calls exit() if something goes wrong during initialization. If all goes well it returns 0. The only time that it returns with something else is if this code at the top of the function fails: if (!rte_atomic32_test_and_set(&run_once)) return -1; Thats there to specifically gate the init routine so it only gets called once. All your code needs to do is check the return for -1. Thats your indicator that its already been initalized. Anything >= 0 is success, and if your program crashes, thats a problem :) Neil