From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gregory Etelson <gregory@weka.io>
Subject: Re: IXBGE VF: link state detection
Date: Thu, 25 May 2017 06:45:22 +0300
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 Ferruh" <ferruh.yigit@intel.com>
To: "Lu, Wenzhuo" <wenzhuo.lu@intel.com>
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Hello,

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.

Regards,
Gregory

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=E2=80=99s registe=
rs. So, VF cannot work correctly. That=E2=80=99s why you can know link down=
 but not link up and have to reset the process.
=20
=20
Best regards
Wenzhuo Lu
=20
*From:* Gregory Etelson [mailto:gregory@weka.io]=20

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

*To:* dev@dpdk.org

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

*Subject:* IXBGE VF: link state detection
=20
Hello,

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.=20
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 lin=
k_status =3D=3D 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

Regards,
Gregory=20