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Subject: [dpdk-users] Cannot enable VFs for QAT PF
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Hi,

=20

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

1.     Enable VT-d in BIOS

2.     Add the "intel_iommu=3Don iommu=3Dpt" in the kernel command line

3.     QAT device driver has been inserted:

~ # lsmod | grep qa

qat_c62x               16384  0=20

intel_qat             114688  1 qat_c62x

=20

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)

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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=20

--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_c62=
x

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

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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/sr=
iov_numvfs

./devices/pci0000:b2/0000:b2:00.0/0000:b3:00.0/0000:b4:02.0/0000:b7:00.0/sr=
iov_numvfs

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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=20

sh: write error: No such file or directory

=20

Can any guys know some clue about it?

Thanks,

=20