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 E36E6A05D3 for ; Mon, 20 May 2019 10:20:21 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id BD0A45B12; Mon, 20 May 2019 10:20:21 +0200 (CEST) Received: from relay0182.mxlogin.com (relay0182.mxlogin.com [199.181.239.182]) by dpdk.org (Postfix) with ESMTP id 200765A6A for ; Mon, 20 May 2019 10:20:20 +0200 (CEST) Received: from filter002.mxroute.com (unknown [94.130.183.33]) by relay0182.mxlogin.com (Postfix) with ESMTP id 2B8B3CC70314; Mon, 20 May 2019 03:20:19 -0500 (CDT) Received: from localhost (unknown [23.92.70.113]) by filter002.mxroute.com (Postfix) with ESMTPS id 49E083F026; Mon, 20 May 2019 08:20:14 +0000 (UTC) Received: from [192.55.54.41] by localhost with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.91) (envelope-from ) id 1hSdXY-00023e-9Z; Mon, 20 May 2019 04:21:00 -0400 To: Stephen Hemminger , "Wang, Haiyue" Cc: "dev@dpdk.org" References: <20190517114640.31e1e234@hermes.lan> <20190518063319.7b05bdf3@hermes.lan> From: Ray Kinsella Openpgp: preference=signencrypt Autocrypt: addr=mdr@ashroe.eu; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190518063319.7b05bdf3@hermes.lan> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-AuthUser: mdr@ashroe.eu Subject: Re: [dpdk-dev] Instability of port ids 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 18/05/2019 14:33, Stephen Hemminger wrote: > On Sat, 18 May 2019 06:03:22 +0000 > "Wang, Haiyue" wrote: > >>> -----Original Message----- >>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Stephen Hemminger >>> Sent: Saturday, May 18, 2019 02:47 >>> To: dev@dpdk.org >>> Subject: [dpdk-dev] Instability of port ids >>> >>> Several customers have reported similar issues with how the owned/stack device model >>> works in DPDK. With failsafe/tap and VF or netvsc and VF there are DPDK ports which >>> are marked as owned and therefore not visible. >>> >>> The problem is the application has to guess and workaround these port values in >>> the port mask that gets passed in on command line. This means a working application >>> has to modify its startup script to run on Azure. Worse the actual port values >>> change based on the number of NIC's configured. >>> >>> Overall this is a nuisance for users. The whole DPDK port index concept is a bad >>> design. In Linux/BSD there is ifindex, but few applications care, they all use names >>> which is better. Very very few application care that eth1 is ifindex 4. >>> >>> The whole assignment of ports is a mess as well since it is based on probe order >>> and that is based on PCI order, and not anything dependable. It gets worse with >>> command line arguments, vdev, owned devices etc. >>> >>> All I can think of is that: >>> * DPDK network devices need to have human readable names. current PCI is not good. >>> * The names need to be repeatable/persistent. udev names are probably better than anything so far. >>> Or bsd style names but they end up being device dependent. >>> * The API to get from name to port needs to easy to use and the preferred method. >>> * All examples and documentation should avoid using port index directly. >>> You need port for fast rx/tx but setup should be by name. >> >> idea from system like enp24s0f0 ? >> https://github.com/systemd/systemd/blob/master/docs/PREDICTABLE_INTERFACE_NAMES.md >> https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c >> > > The other suggestion is to use an algorithm like VPP which generates > TenGigabitEthernet0/2/2 > That was going to be my suggestion also ... :-) Either/or I would be fine with, as you say indexes are unreliable, and that only get's worse as you look at ephemeral interfaces like veth. One comment though. What I really do like about uDev/SystemD is that it is highly user configurable, that the end user can set a udev to influence the naming scheme. Thanks, Ray K Ray K