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I40E Poll Mode Driver
======================

The I40E PMD (librte_pmd_i40e) provides poll mode driver support
for the Intel X710/XL710/X722 10/40 Gbps family of adapters.


Features
--------

Features of the I40E PMD are:

- Multiple queues for TX and RX
- Receiver Side Scaling (RSS)
- MAC/VLAN filtering
- Packet type information
- Flow director
- Cloud filter
- Checksum offload
- VLAN/QinQ stripping and inserting
- TSO offload
- Promiscuous mode
- Multicast mode
- Port hardware statistics
- Jumbo frames
- Link state information
- Link flow control
- Mirror on port, VLAN and VSI
- Interrupt mode for RX
- Scattered and gather for TX and RX
- Vector Poll mode driver
- DCB
- VMDQ
- SR-IOV VF
- Hot plug
- IEEE1588/802.1AS timestamping


Prerequisites
-------------

- Identifying your adapter using `Intel Support
  <http://www.intel.com/support>`_ and get the latest NVM/FW images.

- Follow the DPDK :ref:`Getting Started Guide for Linux <linux_gsg>` to setup the basic DPDK environment.

- To get better performance on Intel platforms, please follow the "How to get best performance with NICs on Intel platforms"
  section of the :ref:`Getting Started Guide for Linux <linux_gsg>`.


Pre-Installation Configuration
------------------------------

Config File Options
~~~~~~~~~~~~~~~~~~~

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

- ``CONFIG_RTE_LIBRTE_I40E_PMD`` (default ``y``)

  Toggle compilation of the ``librte_pmd_i40e`` driver.

- ``CONFIG_RTE_LIBRTE_I40E_DEBUG_*`` (default ``n``)

  Toggle display of generic debugging messages.

- ``CONFIG_RTE_LIBRTE_I40E_RX_ALLOW_BULK_ALLOC`` (default ``y``)

  Toggle bulk allocation for RX.

- ``CONFIG_RTE_LIBRTE_I40E_INC_VECTOR`` (default ``n``)

  Toggle the use of Vector PMD instead of normal RX/TX path.
  To enable vPMD for RX, bulk allocation for Rx must be allowed.

- ``CONFIG_RTE_LIBRTE_I40E_RX_OLFLAGS_ENABLE`` (default ``y``)

  Toggle to enable RX ``olflags``.
  This is only meaningful when Vector PMD is used.

- ``CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC`` (default ``n``)

  Toggle to use a 16-byte RX descriptor, by default the RX descriptor is 32 byte.

- ``CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_PF`` (default ``64``)

  Number of queues reserved for PF.

- ``CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF`` (default ``4``)

  Number of queues reserved for each SR-IOV VF.

- ``CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM`` (default ``4``)

  Number of queues reserved for each VMDQ Pool.

- ``CONFIG_RTE_LIBRTE_I40E_ITR_INTERVAL`` (default ``-1``)

  Interrupt Throttling interval.


Runtime Config Options
~~~~~~~~~~~~~~~~~~~~~~

- ``Support multiple driver`` (default ``disable``)

  There was a multiple driver support issue during use of 700 series Ethernet
  Adapter with both Linux kernel and DPDK PMD. To fix this issue, ``devargs``
  parameter ``support-multi-driver`` is introduced, for example::

    -w 84:00.0,support-multi-driver=1

  With the above configuration, DPDK PMD will not change global registers, and
  will switch PF interrupt from IntN to Int0 to avoid interrupt conflict between
  DPDK and Linux Kernel.

Driver Compilation
~~~~~~~~~~~~~~~~~~

To compile the I40E PMD see :ref:`Getting Started Guide for Linux <linux_gsg>` or
:ref:`Getting Started Guide for FreeBSD <freebsd_gsg>` depending on your platform.


Linux
-----


Running testpmd
~~~~~~~~~~~~~~~

This section demonstrates how to launch ``testpmd`` with Intel XL710/X710
devices managed by ``librte_pmd_i40e`` in the Linux operating system.

#. Load ``igb_uio`` or ``vfio-pci`` driver:

   .. code-block:: console

      modprobe uio
      insmod ./x86_64-native-linuxapp-gcc/kmod/igb_uio.ko

   or

   .. code-block:: console

      modprobe vfio-pci

#. Bind the XL710/X710 adapters to ``igb_uio`` or ``vfio-pci`` loaded in the previous step:

   .. code-block:: console

      ./tools/dpdk-devbind.py --bind igb_uio 0000:83:00.0

   Or setup VFIO permissions for regular users and then bind to ``vfio-pci``:

   .. code-block:: console

      ./tools/dpdk-devbind.py --bind vfio-pci 0000:83:00.0

#. Start ``testpmd`` with basic parameters:

   .. code-block:: console

      ./x86_64-native-linuxapp-gcc/app/testpmd -c 0xf -n 4 -w 83:00.0 -- -i

   Example output:

   .. code-block:: console

      ...
      EAL: PCI device 0000:83:00.0 on NUMA socket 1
      EAL: probe driver: 8086:1572 rte_i40e_pmd
      EAL: PCI memory mapped at 0x7f7f80000000
      EAL: PCI memory mapped at 0x7f7f80800000
      PMD: eth_i40e_dev_init(): FW 5.0 API 1.5 NVM 05.00.02 eetrack 8000208a
      Interactive-mode selected
      Configuring Port 0 (socket 0)
      ...

      PMD: i40e_dev_rx_queue_setup(): Rx Burst Bulk Alloc Preconditions are
      satisfied.Rx Burst Bulk Alloc function will be used on port=0, queue=0.

      ...
      Port 0: 68:05:CA:26:85:84
      Checking link statuses...
      Port 0 Link Up - speed 10000 Mbps - full-duplex
      Done

      testpmd>


SR-IOV: Prerequisites and sample Application Notes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

#. Load the kernel module:

   .. code-block:: console

      modprobe i40e

   Check the output in dmesg:

   .. code-block:: console

      i40e 0000:83:00.1 ens802f0: renamed from eth0

#. Bring up the PF ports:

   .. code-block:: console

      ifconfig ens802f0 up

#. Create VF device(s):

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

   Example:

   .. code-block:: console

      echo 2 > /sys/devices/pci0000:00/0000:00:03.0/0000:81:00.0/sriov_numvfs


#. Assign VF MAC address:

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

   .. code-block:: console

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

   Example:

   .. code-block:: console

      ip link set ens802f0 vf 0 mac a0:b0:c0:d0:e0:f0

#. Assign VF to VM, and bring up the VM.
   Please see the documentation for the *I40E/IXGBE/IGB Virtual Function Driver*.


Sample Application Notes
------------------------

Vlan filter
~~~~~~~~~~~

Vlan filter only works when Promiscuous mode is off.

To start ``testpmd``, and add vlan 10 to port 0:

.. code-block:: console

    ./app/testpmd -c ffff -n 4 -- -i --forward-mode=mac
    ...

    testpmd> set promisc 0 off
    testpmd> rx_vlan add 10 0


Flow Director
~~~~~~~~~~~~~

The Flow Director works in receive mode to identify specific flows or sets of flows and route them to specific queues.
The Flow Director filters can match the different fields for different type of packet: flow type, specific input set per flow type and the flexible payload.

The default input set of each flow type is::

   ipv4-other : src_ip_address, dst_ip_address
   ipv4-frag  : src_ip_address, dst_ip_address
   ipv4-tcp   : src_ip_address, dst_ip_address, src_port, dst_port
   ipv4-udp   : src_ip_address, dst_ip_address, src_port, dst_port
   ipv4-sctp  : src_ip_address, dst_ip_address, src_port, dst_port,
                verification_tag
   ipv6-other : src_ip_address, dst_ip_address
   ipv6-frag  : src_ip_address, dst_ip_address
   ipv6-tcp   : src_ip_address, dst_ip_address, src_port, dst_port
   ipv6-udp   : src_ip_address, dst_ip_address, src_port, dst_port
   ipv6-sctp  : src_ip_address, dst_ip_address, src_port, dst_port,
                verification_tag
   l2_payload : ether_type

The flex payload is selected from offset 0 to 15 of packet's payload by default, while it is masked out from matching.

Start ``testpmd`` with ``--disable-rss`` and ``--pkt-filter-mode=perfect``:

.. code-block:: console

   ./app/testpmd -c ffff -n 4 -- -i --disable-rss --pkt-filter-mode=perfect \
                 --rxq=8 --txq=8 --nb-cores=8 --nb-ports=1

Add a rule to direct ``ipv4-udp`` packet whose ``dst_ip=2.2.2.5, src_ip=2.2.2.3, src_port=32, dst_port=32`` to queue 1:

.. code-block:: console

   testpmd> flow_director_filter 0 mode IP add flow ipv4-udp  \
            src 2.2.2.3 32 dst 2.2.2.5 32 vlan 0 flexbytes () \
	    fwd pf queue 1 fd_id 1

Check the flow director status:

.. code-block:: console

   testpmd> show port fdir 0

   ######################## FDIR infos for port 0      ####################
     MODE:   PERFECT
     SUPPORTED FLOW TYPE:  ipv4-frag ipv4-tcp ipv4-udp ipv4-sctp ipv4-other
                           ipv6-frag ipv6-tcp ipv6-udp ipv6-sctp ipv6-other
			   l2_payload
     FLEX PAYLOAD INFO:
     max_len:	    16	        payload_limit: 480
     payload_unit:  2	        payload_seg:   3
     bitmask_unit:  2	        bitmask_num:   2
     MASK:
       vlan_tci: 0x0000,
       src_ipv4: 0x00000000,
       dst_ipv4: 0x00000000,
       src_port: 0x0000,
       dst_port: 0x0000
       src_ipv6: 0x00000000,0x00000000,0x00000000,0x00000000,
       dst_ipv6: 0x00000000,0x00000000,0x00000000,0x00000000
     FLEX PAYLOAD SRC OFFSET:
       L2_PAYLOAD:    0      1	    2	   3	  4	 5	6  ...
       L3_PAYLOAD:    0      1	    2	   3	  4	 5	6  ...
       L4_PAYLOAD:    0      1	    2	   3	  4	 5	6  ...
     FLEX MASK CFG:
       ipv4-udp:    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ipv4-tcp:    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ipv4-sctp:   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ipv4-other:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ipv4-frag:   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ipv6-udp:    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ipv6-tcp:    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ipv6-sctp:   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ipv6-other:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       ipv6-frag:   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
       l2_payload:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
     guarant_count: 1	        best_count:    0
     guarant_space: 512         best_space:    7168
     collision:     0	        free:	       0
     maxhash:	    0	        maxlen:        0
     add:	    0	        remove:        0
     f_add:	    0	        f_remove:      0


Delete all flow director rules on a port:

.. code-block:: console

   testpmd> flush_flow_director 0

Floating VEB
~~~~~~~~~~~~~

The Intel® Ethernet Controller X710 and XL710 Family support a feature called
"Floating VEB".

A Virtual Ethernet Bridge (VEB) is an IEEE Edge Virtual Bridging (EVB) term
for functionality that allows local switching between virtual endpoints within
a physical endpoint and also with an external bridge/network.

A "Floating" VEB doesn't have an uplink connection to the outside world so all
switching is done internally and remains within the host. As such, this
feature provides security benefits.

In addition, a Floating VEB overcomes a limitation of normal VEBs where they
cannot forward packets when the physical link is down. Floating VEBs don't need
to connect to the NIC port so they can still forward traffic from VF to VF
even when the physical link is down.

Therefore, with this feature enabled VFs can be limited to communicating with
each other but not an outside network, and they can do so even when there is
no physical uplink on the associated NIC port.

To enable this feature, the user should pass a ``devargs`` parameter to the
EAL, for example::

    -w 84:00.0,enable_floating_veb=1

In this configuration the PMD will use the floating VEB feature for all the
VFs created by this PF device.

Alternatively, the user can specify which VFs need to connect to this floating
VEB using the ``floating_veb_list`` argument::

    -w 84:00.0,enable_floating_veb=1,floating_veb_list=1;3-4

In this example ``VF1``, ``VF3`` and ``VF4`` connect to the floating VEB,
while other VFs connect to the normal VEB.

The current implementation only supports one floating VEB and one regular
VEB. VFs can connect to a floating VEB or a regular VEB according to the
configuration passed on the EAL command line.

The floating VEB functionality requires a NIC firmware version of 5.0
or greater.


Limitations or Known issues
---------------------------

MPLS packet classification on X710/XL710
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

For firmware versions prior to 5.0, MPLS packets are not recognized by the NIC.
The L2 Payload flow type in flow director can be used to classify MPLS packet
by using a command in testpmd like:

   testpmd> flow_director_filter 0 mode IP add flow l2_payload ether \
            0x8847 flexbytes () fwd pf queue <N> fd_id <M>

With the NIC firmware version 5.0 or greater, some limited MPLS support
is added: Native MPLS (MPLS in Ethernet) skip is implemented, while no
new packet type, no classification or offload are possible. With this change,
L2 Payload flow type in flow director cannot be used to classify MPLS packet
as with previous firmware versions. Meanwhile, the Ethertype filter can be
used to classify MPLS packet by using a command in testpmd like:

   testpmd> ethertype_filter 0 add mac_ignr 00:00:00:00:00:00 ethertype \
            0x8847 fwd queue <M>

16 Byte Descriptor cannot be used on DPDK VF
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

If the Linux i40e kernel driver is used as host driver, while DPDK i40e PMD
is used as the VF driver, DPDK cannot choose 16 byte receive descriptor. That
is to say, user should keep ``CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC=n`` in
config file.

Link down with i40e kernel driver after DPDK application exist
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

After DPDK application quit, and the device is bound back to Linux i40e
kernel driver, the link cannot be up after ``ifconfig <dev> up``.
To work around this issue, ``ethtool -s <dev> autoneg on`` should be
set first and then the link can be brought up through ``ifconfig <dev> up``.

NOTE: requires Linux kernel i40e driver version >= 1.4.X

Receive packets with Ethertype 0x88A8
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Due to the FW limitation, PF can receive packets with Ethertype 0x88A8
only when floating VEB is disabled.

Global configuration warning
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I40E PMD will set some global registers to enable some function or set some
configure. Then when using different ports of the same NIC with Linux kernel
and DPDK, the port with Linux kernel will be impacted by the port with DPDK.
For example, register I40E_GL_SWT_L2TAGCTRL is used to control L2 tag, i40e
PMD uses I40E_GL_SWT_L2TAGCTRL to set vlan TPID. If setting TPID in port A
with DPDK, then the configuration will also impact port B in the NIC with
kernel driver, which don't want to use the TPID.
So PMD reports warning to clarify what is changed by writing global register.
