[dpdk-users] IXBGE VF: link state detection

Lu, Wenzhuo wenzhuo.lu at intel.com
Thu May 25 02:56:34 CEST 2017

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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