Not able to do FLR on avalon streaming PCIe core

Hi,

I am trying to do initiate Function Level Reset, on Avlaon streaming pcie hard IP (2PF and 6VFs), using setpci command and if I try to read the device back using lspci command the device is hang with ff as shown below,

lspci -v -d:<nu>
3b:00.0 Co-processor: Intel Corporation Device <nu> (rev ff) (prog-if ff)
!!! Unknown header type 7f

------------------------------------------------------------------------------------------------

I am doing the FLR using setpci as :

setpci -s 3b:00.0 0x78.W
2037
setpci -s 3b:00.0 0x78.W=0xa037
setpci -s 3b:00.0 0x78.W
ffff

The flr_pf_active signal - output from Avalon-Streaming PCIe is also zero after doing FLR.

Please suggest is this correct behavior.

Also help us understand what all factors can contribute to this observation.

Regards,

Piyush