From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id 01335A0096 for ; Thu, 6 Jun 2019 11:07:20 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 3A83D1B959; Thu, 6 Jun 2019 11:07:19 +0200 (CEST) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by dpdk.org (Postfix) with ESMTP id 23F9C1B958 for ; Thu, 6 Jun 2019 11:07:16 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Jun 2019 02:07:15 -0700 X-ExtLoop1: 1 Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.26]) ([10.237.221.26]) by orsmga006.jf.intel.com with ESMTP; 06 Jun 2019 02:07:14 -0700 To: "David Harton (dharton)" , Bruce Richardson Cc: "dev@dpdk.org" , "beilei.xing@intel.com" , "qi.z.zhang@intel.com" References: <20190515130512.6366-1-dharton@cisco.com> <20190515161346.33080-1-dharton@cisco.com> <20190516140849.GA625@bricha3-MOBL.ger.corp.intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v2] net/i40e: Eliminate weak symbols in i40e_rxtx.c X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 6/4/2019 5:19 PM, David Harton (dharton) wrote: > >> -----Original Message----- >> From: Ferruh Yigit >> Sent: Tuesday, June 04, 2019 12:00 PM >> To: Bruce Richardson ; David Harton (dharton) >> >> Cc: dev@dpdk.org; beilei.xing@intel.com; qi.z.zhang@intel.com >> Subject: Re: [dpdk-dev] [PATCH v2] net/i40e: Eliminate weak symbols in >> i40e_rxtx.c >> >> On 5/16/2019 3:08 PM, Bruce Richardson wrote: >>> On Wed, May 15, 2019 at 12:13:46PM -0400, David Harton wrote: >>>> Use of weak symbols can hide makefile errors especially when custom >>>> makefiles are used. Removing the use of weak symbols to avoid a stub >>>> function being linked in production code. >>>> >>>> Signed-off-by: David Harton >>>> --- >>>> >>>> v2 - added CC_AVX2_SUPPORT check to code enabling avx2 vectors >>>> >>> Testing a few compiles here, this breaks when vector mode is disabled, >>> because it's possible that CC_AVX2_SUPPORT=1 when VECTOR=n. I'd >>> suggest adding "ifeq ($(CONFIG_RTE_LIBRTE_I40E_INC_VECTOR),y) ... >>> endif" around the block in the makefile checking for AVX2 support, so >>> that we never set AVX2 unless we have vector support. >> >> Concern is this is pushing vectorization support more to compile time >> configuration. Do we really have to select if to use vector PMD or not in >> compile time? >> >> Can't we get rid of the 'CONFIG_RTE_LIBRTE_I40E_INC_VECTOR' config option >> completely? As done in the ICE driver now. >> >> Isn't it better to compile vectorization support in as much as possible >> and do the vector or scalar path selection in runtime, this patch may >> prevent us to do that, weak functions enables us being more dynamic. > > Choosing a vector dynamically can be done without the use of weak symbols. No objection then. > > IMHO, weak symbols should really be used for cross library support where a user wants to override a 3rd party function not within a lib. In fact the weak symbol usage may preclude supporting all the variants you might need/want to select. > >> >>> >>> With this change, you can include my ack in v3. >>> >>> /Bruce >>> >>> Acked-by: Bruce Richardson >>> >