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.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2017 Cavium, Inc
LiquidIO VF Poll Mode Driver
============================
The LiquidIO VF PMD library (librte_pmd_lio) provides poll mode driver support for
Cavium LiquidIO® II server adapter VFs. PF management and VF creation can be
done using kernel driver.
More information can be found at `Cavium Official Website
<http://cavium.com/LiquidIO_Adapters.html>`_.
Supported LiquidIO Adapters
-----------------------------
- LiquidIO II CN2350 210SV/225SV
- LiquidIO II CN2350 210SVPT
- LiquidIO II CN2360 210SV/225SV
- LiquidIO II CN2360 210SVPT
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.
SR-IOV: Prerequisites and Sample Application Notes
--------------------------------------------------
This section provides instructions to configure SR-IOV with Linux OS.
#. Verify SR-IOV and ARI capabilities are enabled on the adapter using ``lspci``:
.. code-block:: console
lspci -s <slot> -vvv
Example output:
.. code-block:: console
[...]
Capabilities: [148 v1] Alternative Routing-ID Interpretation (ARI)
[...]
Capabilities: [178 v1] Single Root I/O Virtualization (SR-IOV)
[...]
Kernel driver in use: LiquidIO
#. Load the kernel module:
.. code-block:: console
modprobe liquidio
#. Bring up the PF ports:
.. code-block:: console
ifconfig p4p1 up
ifconfig p4p2 up
#. Change PF MTU if required:
.. code-block:: console
ifconfig p4p1 mtu 9000
ifconfig p4p2 mtu 9000
#. Create VF device(s):
Echo number of VFs to be created into ``"sriov_numvfs"`` sysfs entry
of the parent PF.
.. code-block:: console
echo 1 > /sys/bus/pci/devices/0000:03:00.0/sriov_numvfs
echo 1 > /sys/bus/pci/devices/0000:03:00.1/sriov_numvfs
#. 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:
.. code-block:: console
ip link set p4p1 vf 0 mac F2:A8:1B:5E:B4:66
#. 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:
.. code-block:: console
./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
#. Running testpmd
Refer to the document
:ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>` to run
``testpmd`` application.
.. note::
Use ``igb_uio`` instead of ``vfio-pci`` in VM.
Example output:
.. code-block:: console
[...]
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>
#. Enabling VF promiscuous mode
One VF per PF can be marked as trusted for promiscuous mode.
.. code-block:: console
ip link set dev <PF iface> vf <VF id> trust on
Limitations
-----------
VF MTU
~~~~~~
VF MTU is limited by PF MTU. Raise PF value before configuring VF for larger packet size.
VLAN offload
~~~~~~~~~~~~
Tx VLAN insertion is not supported and consequently VLAN offload feature is
marked partial.
Ring size
~~~~~~~~~
Number of descriptors for Rx/Tx ring should be in the range 128 to 512.
CRC striping
~~~~~~~~~~~~
LiquidIO adapters strip ethernet FCS of every packet coming to the host interface.
|
