From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <thomas@monjalon.net> Received: from out3-smtp.messagingengine.com (out3-smtp.messagingengine.com [66.111.4.27]) by dpdk.org (Postfix) with ESMTP id 104201C694 for <dev@dpdk.org>; Fri, 13 Apr 2018 18:31:28 +0200 (CEST) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id 961B7213DD; Fri, 13 Apr 2018 12:31:24 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute1.internal (MEProxy); Fri, 13 Apr 2018 12:31:24 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=monjalon.net; h= cc:content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to:x-me-sender:x-me-sender:x-sasl-enc; s= mesmtp; bh=LW4z+qodHv9gHBHsd1Bk1ipW5tDMIqiF/9MzcG3VYIU=; b=ZwI6m QlYT1eS6k+aSAOnWwUOd8a2Vpu2P361Ds8ODESfdQ18mW8+alzmHF2JcWJ2XmOAc LBmU2687rg+KX8VxNUNlqQxaDMaYOURW4UbF1h50usWyUr7sFjoOuMYb027Kmcgq Rg75ET6wuL6sNC7ZWAdS4Pm+1uYI3y5sJuICkA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-me-sender :x-me-sender:x-sasl-enc; s=fm2; bh=LW4z+qodHv9gHBHsd1Bk1ipW5tDMI qiF/9MzcG3VYIU=; b=h7EZmaL4yxLy9q6sj/4QHazf7OCmWyH3sN//6/2q49hzs 8nyw91TaSEWnOgsbD0FDRkJY1q1QG12aA6uL5Vg8jEud3jtXjAOvXnL4E9OIOg2z MdgnbbLLAcRhK6dF+r9P5S7prPUi2qwgrMTO34zef1t1y/OGAxHvDAsVLd//c3Sf LcRKarjceNcw2B+ngUznoj7RLPyMZrrjfknWK/GEhB9wWKh/xtYHlfzE0Qek3a7t gIpDWyW73TplBrlJ3xe+XTSRLkgHBEoftIOA3VMCJtHL43PlwsZTDQlJdzRlNuP6 ehdUO+RAxcrGD5GoyHXJSRtDkmqonJRCkn+10BpuQ== X-ME-Sender: <xms:XNvQWpBM1rD0_tuRs5k_O0Ly2Azw3msh6pt1M5dextjkcE3rQY_asg> Received: from xps.localnet (184.203.134.77.rev.sfr.net [77.134.203.184]) by mail.messagingengine.com (Postfix) with ESMTPA id 26BA8E4925; Fri, 13 Apr 2018 12:31:23 -0400 (EDT) From: Thomas Monjalon <thomas@monjalon.net> To: dev@dpdk.org Cc: bruce.richardson@intel.com, anatoly.burakov@intel.com, pmatilai@redhat.com, david.marchand@6wind.com, jia.guo@intel.com, matan@mellanox.com, konstantin.ananyev@intel.com, stephen@networkplumber.org, fbl@redhat.com Date: Fri, 13 Apr 2018 18:31:21 +0200 Message-ID: <2407757.yEAnF6RcS7@xps> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Subject: [dpdk-dev] kernel binding of devices + hotplug X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://dpdk.org/ml/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://dpdk.org/ml/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://dpdk.org/ml/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> X-List-Received-Date: Fri, 13 Apr 2018 16:31:29 -0000 It's time to think (again) how we bind devices with kernel modules. We need to decide how we want to manage hotplugged devices with DPDK. A bit of history first. There was some code in DPDK for bind/unbind, but it has been removed in DPDK 1.7 - http://dpdk.org/commit/5d8751b83 Copy of the commit message (in 2014): " The bind/unbind operations should not be handled by the eal. These operations should be either done outside of dpdk or inside the PMDs themselves as these are their problems. " The question raised at this time (4 years ago) is still under discussion. Should we manage binding inside or outside DPDK? Should it be controlled in the application or in the OS base? As you know, we use dpdk-devbind.py. This tool lacks two major features: - persistent configuration - hotplug If we consider that the DPDK applications should be able to apply its own policy to choose the devices to bind, then we need to implement binding in the PMD (with EAL helpers). On the other hand, if we consider that it is the system responsibility, then we could choose systemd/udev and driverctl. The debate is launched! Please find more details in the references below. Announce of driverctl: http://dpdk.org/ml/archives/dev/2015-December/029500.html Repository of driverctl: https://gitlab.com/driverctl/driverctl Discussion about binding script and driverctl: http://dpdk.org/ml/archives/dev/2018-April/095687.html Patch to implement binding in DPDK (for hotplug): http://dpdk.org/ml/archives/dev/2018-April/095714.html Discussion in the same hotplug series: http://dpdk.org/ml/archives/dev/2018-April/097058.html