From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Subject: Re: [disscussion] A problem about dpdk backup-mode bond
 switching with mlx4 VF devices
Date: Tue, 17 Apr 2018 12:07:31 +0200
Message-ID: <20180417100731.GF4957@6wind.com>
References: <859E1CB9FBF08C4B839DCF451B09C5032E01348F@dggeml509-mbx.china.huawei.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: "dev@dpdk.org" <dev@dpdk.org>,
 "nelio.laranjeiro@6wind.com" <nelio.laranjeiro@6wind.com>,
 "Zhoujingbin (Robin, Cloud Networking)" <zhoujingbin@huawei.com>,
 "Zhoulei (G)" <stone.zhou@huawei.com>, yangleyuan <yangleyuan@huawei.com>
To: chenchanghu <chenchanghu@huawei.com>
Return-path: <dev-bounces@dpdk.org>
Received: from mail-wr0-f181.google.com (mail-wr0-f181.google.com
 [209.85.128.181]) by dpdk.org (Postfix) with ESMTP id EA63E8E6D
 for <dev@dpdk.org>; Tue, 17 Apr 2018 12:07:45 +0200 (CEST)
Received: by mail-wr0-f181.google.com with SMTP id q13so30413181wre.3
 for <dev@dpdk.org>; Tue, 17 Apr 2018 03:07:45 -0700 (PDT)
Content-Disposition: inline
In-Reply-To: <859E1CB9FBF08C4B839DCF451B09C5032E01348F@dggeml509-mbx.china.huawei.com>
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>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

On Tue, Apr 17, 2018 at 06:40:20AM +0000, chenchanghu wrote:
> 
> Hi,
>          When I used the mlx4 pmd, I meet a problem about mlx4 VF bond switching which bond mod is backup-mode . The detail test is descripted below.
> 1.Test environmemt infomation:
>   a. Linux distribution: CentOS
>   b. dpdk version: dpdk-16.04
>   c. Ethernet device : mlx4 VF
>   d. pmd info: mlx4 poll-mode-driver
> 
> 2.Test step:
>   a. we bond the mlx4 VF Ethernet device eth7,eth8 into backup-mode by dpdk application. Eth7 and eth8 are both active, and  eth7 is the primary device.
>   b. As we know,  the device eth7 , eth8 are also  visible by kernel driver mlx4_en.
>   c. Then we config the Ethernet device eth7 down by the command ' ifconfig eth7 down', the expect result is the bond primary device will  not switch.
>   d. However we find the dpdk bond primary device switch to eth8 by dpdk maintenance interface one time in all 20 test times.
> 
> 3.Question:
>    Is the VF up or down State of kernel interface has some relations to user-space state? For example, when ifconfig eth7 down, and the user-space will change to down state too.

Yes, this is expected. Netdevices and the mlx4 DPDK PMD share a common link
status. Bringing a netdevice down causes link status to be down for all its
users. This behavior is documented [1].

[1] http://dpdk.org/doc/guides/nics/mlx4.html#run-time-configuration

-- 
Adrien Mazarguil
6WIND