[dpdk-users] vfio-pci: probe of 0000:00:07.0 failed with error -22-KVM guest

["Raman, Sandeep" <sandeepr@hpe.com>]

Hi,

I am trying to bind SRIOV VF to a kvm guest with vfio-pci module. DPDK version is 17.11. Both host and guest OS is RHEL 7.5.

On KVM guest:
[root@rh75vm ~]# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-862.11.6.el7.x86_64 root=/dev/mapper/rhel-root ro crashkernel=auto rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap LANG=en_US.UTF-8 default_hugepagesz=1GB hugepagesz=1G hugepages=8 console=ttyS0,115200

[root@rh75vm ~]# dpdk-devbind --status-dev net

Network devices using DPDK-compatible driver
============================================
<none>

Network devices using kernel driver
===================================
0000:00:03.0 'Virtio network device 1000' if=eth0 drv=virtio-pci unused= *Active*
0000:00:07.0 'Ethernet Virtual Function 700 Series 154c' if=ens7 drv=i40evf unused=
0000:00:08.0 'Ethernet Virtual Function 700 Series 154c' if=ens8 drv=i40evf unused=

Other Network devices
=====================
<none>

[root@rh75vm ~]# modprobe vfio-pci
[root@rh75vm ~]# lsmod |grep vfio
vfio_pci               41312  0
vfio_iommu_type1       22300  0
vfio                   32695  2 vfio_iommu_type1,vfio_pci
irqbypass              13503  1 vfio_pci
[root@rh75vm ~]# dpdk-devbind -b vfio-pci 00:07.0 00:08.0
Error: bind failed for 0000:00:07.0 - Cannot bind to driver vfio-pci
Error: unbind failed for 0000:00:07.0 - Cannot open /sys/bus/pci/drivers//unbind
[root@rh75vm ~]# tailf -n3 /var/log/messages
Aug 16 05:35:44 rh75vm systemd: Starting Session 1 of user root.
Aug 16 05:36:55 rh75vm kernel: VFIO - User Level meta-driver version: 0.3
Aug 16 05:37:09 rh75vm kernel: vfio-pci: probe of 0000:00:07.0 failed with error -22

On host:

/proc/cmdline:

BOOT_IMAGE=/vmlinuz-3.10.0-862.11.6.el7.x86_64 root=/dev/mapper/rhel-root ro crashkernel=auto rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet LANG=en_US.UTF-8 default_hugepagesz=1GB hugepagesz=1G hugepages=20 isolcpus=1-15,17-31 rcu_nocbs=1-15,17-31 nohz_full=1-15,17-31 intel_iommu=on iommu=pt selinux=0 enforcing=0 processor.max_cstate=0 intel_pstate=disable hpet=disable nosoftlockup intel_idle.max_cstate=0 mce=ignore_ce audit=0

dpdk-devbind --status-dev net

Network devices using DPDK-compatible driver
============================================
0000:86:02.0 'Ethernet Virtual Function 700 Series 154c' drv=vfio-pci unused=
0000:86:0a.0 'Ethernet Virtual Function 700 Series 154c' drv=vfio-pci unused=

Network devices using kernel driver
===================================
0000:02:00.0 'NetXtreme BCM5719 Gigabit Ethernet PCIe 1657' if=eno1 drv=tg3 unused=vfio-pci
0000:02:00.1 'NetXtreme BCM5719 Gigabit Ethernet PCIe 1657' if=eno2 drv=tg3 unused=vfio-pci
0000:02:00.2 'NetXtreme BCM5719 Gigabit Ethernet PCIe 1657' if=eno3 drv=tg3 unused=vfio-pci
0000:02:00.3 'NetXtreme BCM5719 Gigabit Ethernet PCIe 1657' if=eno4 drv=tg3 unused=vfio-pci
0000:86:00.0 'Ethernet Controller XXV710 for 25GbE SFP28 158b' if=ens5f0 drv=i40e unused=vfio-pci
0000:86:00.1 'Ethernet Controller XXV710 for 25GbE SFP28 158b' if=ens5f1 drv=i40e unused=vfio-pci

Other Network devices
=====================

dmesg:

[    0.000000] DMAR: IOMMU enabled
[    2.020878] DMAR: Hardware identity mapping for device 0000:86:00.0
[    2.020881] DMAR: Hardware identity mapping for device 0000:86:00.1
[    2.025617] DMAR: Intel(R) Virtualization Technology for Directed I/O
[    2.048734] iommu: Adding device 0000:86:00.0 to group 59
[    2.048788] iommu: Adding device 0000:86:00.1 to group 60

[    2.136560] pci 0000:86:00.0: Signaling PME through PCIe PME interrupt
[    2.136562] pci 0000:86:00.1: Signaling PME through PCIe PME interrupt
[    2.181458] DMAR: 32bit 0000:01:00.4 uses non-identity mapping
[    2.181839] DMAR: Setting identity map for device 0000:01:00.4 [0x8a688000 - 0x8a688fff]
[    2.810190] DMAR: 32bit 0000:5c:00.0 uses non-identity mapping
[    2.841274] i40e 0000:86:00.0: fw 6.70.48807 api 1.7 nvm 6.00 0x800036cb 1.1747.0
[    3.082766] i40e 0000:86:00.0: MAC address: 48:df:37:36:1b:44
[    3.092871] i40e 0000:86:00.0 eth3: NIC Link is Up, 25 Gbps Full Duplex, Requested FEC: None, FEC: None, Autoneg: False, Flow Control: RX/TX
[    3.102039] i40e 0000:86:00.0: PCI-Express: Speed 8.0GT/s Width x8
[    3.110709] i40e 0000:86:00.0: Features: PF-id[0] VFs: 64 VSIs: 66 QP: 32 RSS FD_ATR FD_SB NTUPLE DCB VxLAN Geneve PTP VEPA
[    3.136506] i40e 0000:86:00.1: fw 6.70.48807 api 1.7 nvm 6.00 0x800036cb 1.1747.0
[    3.373367] i40e 0000:86:00.1: MAC address: 48:df:37:36:1b:45

[    1.510851] pci 0000:86:00.0: [8086:158b] type 00 class 0x020000
[    1.510871] pci 0000:86:00.0: reg 0x10: [mem 0xf0000000-0xf0ffffff 64bit pref]
[    1.510889] pci 0000:86:00.0: reg 0x1c: [mem 0xf2000000-0xf2007fff 64bit pref]
[    1.510903] pci 0000:86:00.0: reg 0x30: [mem 0x00000000-0x0007ffff pref]
[    1.510955] pci 0000:86:00.0: PME# supported from D0 D3hot D3cold
[    1.510980] pci 0000:86:00.0: reg 0x184: [mem 0xd7fffa00000-0xd7fffa0ffff 64bit pref]
[    1.510984] pci 0000:86:00.0: VF(n) BAR0 space: [mem 0xd7fffa00000-0xd7fffdfffff 64bit pref] (contains BAR0 for 64 VFs)
[    1.510998] pci 0000:86:00.0: reg 0x190: [mem 0xd7ffff00000-0xd7ffff03fff 64bit pref]
[    1.511000] pci 0000:86:00.0: VF(n) BAR3 space: [mem 0xd7ffff00000-0xd7fffffffff 64bit pref] (contains BAR3 for 64 VFs)
[    1.511193] pci 0000:86:00.1: [8086:158b] type 00 class 0x020000
[    1.511212] pci 0000:86:00.1: reg 0x10: [mem 0xf1000000-0xf1ffffff 64bit pref]
[    1.511229] pci 0000:86:00.1: reg 0x1c: [mem 0xf2008000-0xf200ffff 64bit pref]
[    1.511243] pci 0000:86:00.1: reg 0x30: [mem 0x00000000-0x0007ffff pref]
[    1.511296] pci 0000:86:00.1: PME# supported from D0 D3hot D3cold
[    1.511317] pci 0000:86:00.1: reg 0x184: [mem 0xd7fff600000-0xd7fff60ffff 64bit pref]
[    1.511320] pci 0000:86:00.1: VF(n) BAR0 space: [mem 0xd7fff600000-0xd7fff9fffff 64bit pref] (contains BAR0 for 64 VFs)
[    1.511334] pci 0000:86:00.1: reg 0x190: [mem 0xd7fffe00000-0xd7fffe03fff 64bit pref]
[    1.511337] pci 0000:86:00.1: VF(n) BAR3 space: [mem 0xd7fffe00000-0xd7fffefffff 64bit pref] (contains BAR3 for 64 VFs)
[    1.538878] pci 0000:86:00.0: BAR 6: assigned [mem 0xf2080000-0xf20fffff pref]
[    1.538881] pci 0000:86:00.1: BAR 6: no space for [mem size 0x00080000 pref]
[    1.538884] pci 0000:86:00.1: BAR 6: failed to assign [mem size 0x00080000 pref]
[    1.538907] pci_bus 0000:86: resource 1 [mem 0xf0000000-0xf20fffff]
[    1.538910] pci_bus 0000:86: resource 2 [mem 0xd7fff600000-0xd7fffffffff 64bit pref]

I found a few threads reported with this error and the solution was to add intel_iommu=on and iommu=pt in the kernel. I have already added this.
Any pointers what is causing the -22 error and how to solve this.

http://mails.dpdk.org/archives/dev/2014-December/010455.html
http://mails.dpdk.org/archives/users/2017-February/001544.html
http://mails.dpdk.org/archives/users/2017-September/002433.html
https://software.intel.com/en-us/forums/networking/topic/600159

Thanks,
Sandeep.