[dpdk-users] Cannot enable VFs for QAT PF

[Changchun Zhang <changchun.zhang@oracle.com>]

Hi,

 

I cannot enable VFs for the QAT device, my steps are as follows:

1.     Enable VT-d in BIOS

2.     Add the "intel_iommu=on iommu=pt" in the kernel command line

3.     QAT device driver has been inserted:

~ # lsmod | grep qa

qat_c62x               16384  0 

intel_qat             114688  1 qat_c62x

 

4.     Find the BDF of the PF:

~ # lspci -d:37c8

b5:00.0 Class 0b40: Device 8086:37c8 (rev 04)

b7:00.0 Class 0b40: Device 8086:37c8 (rev 04)

 

5.     Trying to enable VFs, but I did not find sriov_numvfs in directories:

/sys/bus/pci/drivers/c6xx

/sys/bus/pci/drivers/c6xx # ls -ltr 

--w-------    1      4096 Jan 22 21:41 uevent

--w-------    1      4096 Jan 22 21:43 unbind

--w-------    1      4096 Jan 22 21:43 remove_id

--w-------    1      4096 Jan 22 21:43 new_id

lrwxrwxrwx    1         0 Jan 22 21:43 module -> ../../../../module/qat_c62x

--w-------    1      4096 Jan 22 21:43 bind

 

But I can find sriov_numvfs in other directories:

/sys # find ./ -name sriov_numvfs

./devices/pci0000:b2/0000:b2:00.0/0000:b3:00.0/0000:b4:00.0/0000:b5:00.0/sriov_numvfs

./devices/pci0000:b2/0000:b2:00.0/0000:b3:00.0/0000:b4:02.0/0000:b7:00.0/sriov_numvfs

 

Unfortunately, when trying to enable the VFs with above sriov_numvfs file, cannot write to this file, like:

/sys # echo 16 > ./devices/pci0000:b2/0000:b2:00.0/0000:b3:00.0/0000:b4:02.0/0000:b7:00.0/sriov_numvfs 

sh: write error: No such file or directory

 

Can any guys know some clue about it?

Thanks,