22. LiquidIO VF Poll Mode Driver

22.1. Supported LiquidIO Adapters

• LiquidIO II CN2350 210SV/225SV
• LiquidIO II CN2350 210SVPT
• LiquidIO II CN2360 210SV/225SV
• LiquidIO II CN2360 210SVPT

22.2. Pre-Installation Configuration

The following options can be modified in the config file. Please note that enabling debugging options may affect system performance.

• CONFIG_RTE_LIBRTE_LIO_PMD (default y)

  Toggle compilation of LiquidIO PMD.

• CONFIG_RTE_LIBRTE_LIO_DEBUG_RX (default n)

  Toggle display of receive fast path run-time messages.

• CONFIG_RTE_LIBRTE_LIO_DEBUG_TX (default n)

  Toggle display of transmit fast path run-time messages.

• CONFIG_RTE_LIBRTE_LIO_DEBUG_MBOX (default n)

  Toggle display of mailbox messages.

• CONFIG_RTE_LIBRTE_LIO_DEBUG_REGS (default n)

  Toggle display of register reads and writes.

22.3. SR-IOV: Prerequisites and Sample Application Notes

This section provides instructions to configure SR-IOV with Linux OS.

1. Verify SR-IOV and ARI capabilities are enabled on the adapter using lspci:

   lspci -s <slot> -vvv
   

   Example output:

   [...]
   Capabilities: [148 v1] Alternative Routing-ID Interpretation (ARI)
   [...]
   Capabilities: [178 v1] Single Root I/O Virtualization (SR-IOV)
   [...]
   Kernel driver in use: LiquidIO
   

2. Load the kernel module:

   modprobe liquidio
   

3. Bring up the PF ports:

   ifconfig p4p1 up
   ifconfig p4p2 up
   

4. Change PF MTU if required:

   ifconfig p4p1 mtu 9000
   ifconfig p4p2 mtu 9000
   

5. Create VF device(s):

   Echo number of VFs to be created into "sriov_numvfs" sysfs entry of the parent PF.

   echo 1 > /sys/bus/pci/devices/0000:03:00.0/sriov_numvfs
   echo 1 > /sys/bus/pci/devices/0000:03:00.1/sriov_numvfs
   

6. Assign VF MAC address:

   Assign MAC address to the VF using iproute2 utility. The syntax is:

   ip link set <PF iface> vf <VF id> mac <macaddr>
   

   Example output:

   ip link set p4p1 vf 0 mac F2:A8:1B:5E:B4:66
   

7. Assign VF(s) to VM.

   The VF devices may be passed through to the guest VM using qemu or virt-manager or virsh etc.

   Example qemu guest launch command:

   ./qemu-system-x86_64 -name lio-vm -machine accel=kvm \
   -cpu host -m 4096 -smp 4 \
   -drive file=<disk_file>,if=none,id=disk1,format=<type> \
   -device virtio-blk-pci,scsi=off,drive=disk1,id=virtio-disk1,bootindex=1 \
   -device vfio-pci,host=03:00.3 -device vfio-pci,host=03:08.3
   

8. Running testpmd

   Refer to the document compiling and testing a PMD for a NIC to run testpmd application.

   Note

   Use igb_uio instead of vfio-pci in VM.

   Example output:

   [...]
   EAL: PCI device 0000:03:00.3 on NUMA socket 0
   EAL:   probe driver: 177d:9712 net_liovf
   EAL:   using IOMMU type 1 (Type 1)
   PMD: net_liovf[03:00.3]INFO: DEVICE : CN23XX VF
   EAL: PCI device 0000:03:08.3 on NUMA socket 0
   EAL:   probe driver: 177d:9712 net_liovf
   PMD: net_liovf[03:08.3]INFO: DEVICE : CN23XX VF
   Interactive-mode selected
   USER1: create a new mbuf pool <mbuf_pool_socket_0>: n=171456, size=2176, socket=0
   Configuring Port 0 (socket 0)
   PMD: net_liovf[03:00.3]INFO: Starting port 0
   Port 0: F2:A8:1B:5E:B4:66
   Configuring Port 1 (socket 0)
   PMD: net_liovf[03:08.3]INFO: Starting port 1
   Port 1: 32:76:CC:EE:56:D7
   Checking link statuses...
   Port 0 Link Up - speed 10000 Mbps - full-duplex
   Port 1 Link Up - speed 10000 Mbps - full-duplex
   Done
   testpmd>
   

9. Enabling VF promiscuous mode

   One VF per PF can be marked as trusted for promiscuous mode.

   ip link set dev <PF iface> vf <VF id> trust on
   

22.4. Limitations