[dpdk-users] IXBGE VF: link state detection

Gregory Etelson gregory at weka.io
Thu May 25 05:45:22 CEST 2017


In this case I would expect ixgbe VF bound to kernel driver
also fail on link up detection
In my tests, VFs bound to kernel drivers operate correctly.


On Thursday, 25 May 2017 03:56:34 IDT Lu, Wenzhuo wrote:

Hi Gregory,
After you turned the port donw/up, PF will re-init the VF’s registers. So, VF cannot work correctly. That’s why you can know link down but not link up and have to reset the process.
Best regards
Wenzhuo Lu
*From:* Gregory Etelson [mailto:gregory at weka.io] 

*Sent:* Wednesday, May 24, 2017 5:50 PM

*To:* dev at dpdk.org

*Cc:* users at dpdk.org; Yigit, Ferruh; Lu, Wenzhuo

*Subject:* IXBGE VF: link state detection

In my tests DPDK-17.05.0 process queries link state with rte_eth_link_get() each 50 msec
during 5-20 MB/sec IOs flow.
I turn Ethernet switch port down and up and check IXGBE VF PMD reaction to link state changes. 
VF PMD correctly recognize link down events but may miss link up.
When the fault occurs, subsequent calls to rte_eth_link_get will return link_status == 0 forever.
I need to reset DPDK process to get correct link state value.
My debugging shows that in case of the fault, mbx->ops.read(hw, &in_msg, 1, 0) in ixgbe_check_mac_link_vf
keeps returning non-zero value


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