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From: chenchanghu <chenchanghu@huawei.com>
To: "dev@dpdk.org" <dev@dpdk.org>, "adrien.mazarguil@6wind.com"
 <adrien.mazarguil@6wind.com>, "nelio.laranjeiro@6wind.com"
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CC: "Zhoujingbin (Robin, Cloud Networking)" <zhoujingbin@huawei.com>,
 "Zhoulei (G)" <stone.zhou@huawei.com>, yangleyuan <yangleyuan@huawei.com>
Thread-Topic: [disscussion] A problem about dpdk backup-mode bond switching
 with mlx4 VF devices
Thread-Index: AdPWFtnFHPu6MfdFRoCqMELMZvzyXA==
Date: Tue, 17 Apr 2018 06:40:20 +0000
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Subject: [dpdk-dev] [disscussion] A problem about dpdk backup-mode bond
 switching with mlx4 VF devices
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Hi,
         When I used the mlx4 pmd, I meet a problem about mlx4 VF bond swit=
ching 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 devic=
e.
  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 ma=
intenance interface one time in all 20 test times.

3.Question:
   Is the VF up or down State of kernel interface has some relations to use=
r-space state? For example, when ifconfig eth7 down, and the user-space wil=
l change to down state too.

   Please send your reply to chenchanghu@huawei.com<mailto:chenchanghu@huaw=
ei.com>, any suggestion is to be greatefully appreciated.