From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
To: chenchanghu <chenchanghu@huawei.com>
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>
Subject: Re: [dpdk-dev] [disscussion] A problem about dpdk backup-mode bond switching with mlx4 VF devices
Date: Tue, 17 Apr 2018 12:07:31 +0200 [thread overview]
Message-ID: <20180417100731.GF4957@6wind.com> (raw)
In-Reply-To: <859E1CB9FBF08C4B839DCF451B09C5032E01348F@dggeml509-mbx.china.huawei.com>
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
prev parent reply other threads:[~2018-04-17 10:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-17 6:40 chenchanghu
2018-04-17 10:07 ` Adrien Mazarguil [this message]
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