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
