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 F3841A0679 for ; Fri, 5 Apr 2019 17:17:24 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 6A1C71B53E; Fri, 5 Apr 2019 17:17:22 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 045871B53A for ; Fri, 5 Apr 2019 17:17:20 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Apr 2019 08:17:20 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,313,1549958400"; d="scan'208";a="335305631" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.46]) ([10.237.221.46]) by fmsmga005.fm.intel.com with ESMTP; 05 Apr 2019 08:17:17 -0700 To: Ye Xiaolong Cc: dev@dpdk.org, Stephen Hemminger , Luca Boccassi , Qi Zhang , Karlsson Magnus , Topel Bjorn , Maxime Coquelin , Bruce Richardson , Ananyev Konstantin , David Marchand , Andrew Rybchenko , Olivier Matz References: <20190301080947.91086-1-xiaolong.ye@intel.com> <20190404085113.16732-1-xiaolong.ye@intel.com> <20190404085113.16732-2-xiaolong.ye@intel.com> <20190405150525.GA41807@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/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190405150525.GA41807@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v11 1/1] net/af_xdp: introduce AF XDP PMD driver 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" Message-ID: <20190405151716.rvmo6Xxssee5IcwRmh2RKcTc44V92yWOeeK8RZHP8zE@z> On 4/5/2019 4:05 PM, Ye Xiaolong wrote: > Hi, Ferruh > > On 04/05, Ferruh Yigit wrote: >> On 4/4/2019 9:51 AM, Xiaolong Ye wrote: >>> Add a new PMD driver for AF_XDP which is a proposed faster version of >>> AF_PACKET interface in Linux. More info about AF_XDP, please refer to [1] >>> [2]. >>> >>> This is the vanilla version PMD which just uses a raw buffer registered as >>> the umem. >>> >>> [1] https://fosdem.org/2018/schedule/event/af_xdp/ >>> [2] https://lwn.net/Articles/745934/ >>> >>> Signed-off-by: Xiaolong Ye >> >> <...> >> >>> diff --git a/drivers/net/af_xdp/meson.build b/drivers/net/af_xdp/meson.build >>> new file mode 100644 >>> index 000000000..840c93728 >>> --- /dev/null >>> +++ b/drivers/net/af_xdp/meson.build >>> @@ -0,0 +1,19 @@ >>> +# SPDX-License-Identifier: BSD-3-Clause >>> +# Copyright(c) 2019 Intel Corporation >>> + >>> +if host_machine.system() == 'linux' >>> + bpf_dep = dependency('libbpf', required: false) >>> + if bpf_dep.found() >>> + build = true >>> + else >>> + bpf_dep = cc.find_library('bpf', required: false) >>> + if bpf_dep.found() and cc.has_header('bpf/xsk.h', dependencies: bpf_dep) and cc.has_header('linux/if_xdp.h') >>> + build = true >>> + pkgconfig_extra_libs += '-lbpf' >>> + else >>> + build = false >>> + endif >>> + endif >>> + ext_deps += bpf_dep >>> +endif >>> +sources = files('rte_eth_af_xdp.c') >> >> if system is not 'linux', by default build will be 'true', right, so will it try >> to build the driver in that case? >> What about setting "build = false" before the linux check, so won't need to set >> it false again in the if block, only set it true if dependencies found? > > This is a good catch, we do need to initialize build = false first, otherwise > meson/ninja would just try to build af_xdp pmd if system is not linux, which is > undesired. Do I need to send a separate patch for this so you can squash it into > af_xdp pmd patch? If you are agree with the change, I can send the patch and squash it into the original af_xdp commit: diff --git a/drivers/net/af_xdp/meson.build b/drivers/net/af_xdp/meson.build index 840c93728..e3d86c39a 100644 --- a/drivers/net/af_xdp/meson.build +++ b/drivers/net/af_xdp/meson.build @@ -1,6 +1,7 @@ # SPDX-License-Identifier: BSD-3-Clause # Copyright(c) 2019 Intel Corporation +build = false if host_machine.system() == 'linux' bpf_dep = dependency('libbpf', required: false) if bpf_dep.found() @@ -10,8 +11,6 @@ if host_machine.system() == 'linux' if bpf_dep.found() and cc.has_header('bpf/xsk.h', dependencies: bpf_dep) and cc.has_header('linux/if_xdp.h') build = true pkgconfig_extra_libs += '-lbpf' - else - build = false endif endif ext_deps += bpf_dep > >> And can 'ext_deps' go out of if block? > > If we move `ext_deps += bpf_dep` out of if block and build system is not linux, there > would be error "ERROR: Unknown variable "bpf_dep".", so we need either initialize > bpf_dep (to value like NULL?) first or keep `ext_deps += bpf_dep` inside the if > block, I'd prefer keep it as it is, what's you opinion? OK to keep as it is.