..  SPDX-License-Identifier: BSD-3-Clause
    Copyright(C) 2019 Marvell International Ltd.

OCTEON TX2 Poll Mode driver
===========================

The OCTEON TX2 ETHDEV PMD (**librte_pmd_octeontx2**) provides poll mode ethdev
driver support for the inbuilt network device found in **Marvell OCTEON TX2**
SoC family as well as for their virtual functions (VF) in SR-IOV context.

More information can be found at `Marvell Official Website
<https://www.marvell.com/embedded-processors/infrastructure-processors>`_.

Features
--------

Features of the OCTEON TX2 Ethdev PMD are:

- Packet type information
- Promiscuous mode
- Jumbo frames
- SR-IOV VF
- Lock-free Tx queue
- Multiple queues for TX and RX
- Receiver Side Scaling (RSS)
- MAC/VLAN filtering
- Generic flow API
- Inner and Outer Checksum offload
- VLAN/QinQ stripping and insertion
- Port hardware statistics
- Link state information
- Link flow control
- MTU update
- Scatter-Gather IO support
- Vector Poll mode driver
- Debug utilities - Context dump and error interrupt support
- IEEE1588 timestamping
- HW offloaded `ethdev Rx queue` to `eventdev event queue` packet injection
- Support Rx interrupt

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

See :doc:`../platform/octeontx2` for setup information.

Compile time Config Options
---------------------------

The following options may be modified in the ``config`` file.

- ``CONFIG_RTE_LIBRTE_OCTEONTX2_PMD`` (default ``y``)

  Toggle compilation of the ``librte_pmd_octeontx2`` driver.

Driver compilation and testing
------------------------------

Refer to the document :ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>`
for details.

To compile the OCTEON TX2 PMD for Linux arm64 gcc,
use arm64-octeontx2-linux-gcc as target.

#. Running testpmd:

   Follow instructions available in the document
   :ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>`
   to run testpmd.

   Example output:

   .. code-block:: console

      ./build/app/testpmd -c 0x300 -w 0002:02:00.0 -- --portmask=0x1 --nb-cores=1 --port-topology=loop --rxq=1 --txq=1
      EAL: Detected 24 lcore(s)
      EAL: Detected 1 NUMA nodes
      EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
      EAL: No available hugepages reported in hugepages-2048kB
      EAL: Probing VFIO support...
      EAL: VFIO support initialized
      EAL: PCI device 0002:02:00.0 on NUMA socket 0
      EAL:   probe driver: 177d:a063 net_octeontx2
      EAL:   using IOMMU type 1 (Type 1)
      testpmd: create a new mbuf pool <mbuf_pool_socket_0>: n=267456, size=2176, socket=0
      testpmd: preferred mempool ops selected: octeontx2_npa
      Configuring Port 0 (socket 0)
      PMD: Port 0: Link Up - speed 40000 Mbps - full-duplex

      Port 0: link state change event
      Port 0: 36:10:66:88:7A:57
      Checking link statuses...
      Done
      No commandline core given, start packet forwarding
      io packet forwarding - ports=1 - cores=1 - streams=1 - NUMA support enabled, MP allocation mode: native
      Logical Core 9 (socket 0) forwards packets on 1 streams:
        RX P=0/Q=0 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00

        io packet forwarding packets/burst=32
        nb forwarding cores=1 - nb forwarding ports=1
        port 0: RX queue number: 1 Tx queue number: 1
          Rx offloads=0x0 Tx offloads=0x10000
          RX queue: 0
            RX desc=512 - RX free threshold=0
            RX threshold registers: pthresh=0 hthresh=0  wthresh=0
            RX Offloads=0x0
          TX queue: 0
            TX desc=512 - TX free threshold=0
            TX threshold registers: pthresh=0 hthresh=0  wthresh=0
            TX offloads=0x10000 - TX RS bit threshold=0
      Press enter to exit

Runtime Config Options
----------------------

- ``HW offload ptype parsing disable`` (default ``0``)

   Packet type parsing is HW offloaded by default and this feature may be toggled
   using ``ptype_disable`` ``devargs`` parameter.

- ``Rx&Tx scalar mode enable`` (default ``0``)

   Ethdev supports both scalar and vector mode, it may be selected at runtime
   using ``scalar_enable`` ``devargs`` parameter.

- ``RSS reta size`` (default ``64``)

   RSS redirection table size may be configured during runtime using ``reta_size``
   ``devargs`` parameter.

   For example::

      -w 0002:02:00.0,reta_size=256

   With the above configuration, reta table of size 256 is populated.

- ``Flow priority levels`` (default ``3``)

   RTE Flow priority levels can be configured during runtime using
   ``flow_max_priority`` ``devargs`` parameter.

   For example::

      -w 0002:02:00.0,flow_max_priority=10

   With the above configuration, priority level was set to 10 (0-9). Max
   priority level supported is 32.

- ``Reserve Flow entries`` (default ``8``)

   RTE flow entries can be pre allocated and the size of pre allocation can be
   selected runtime using ``flow_prealloc_size`` ``devargs`` parameter.

   For example::

      -w 0002:02:00.0,flow_prealloc_size=4

   With the above configuration, pre alloc size was set to 4. Max pre alloc
   size supported is 32.

- ``Max SQB buffer count`` (default ``512``)

   Send queue descriptor buffer count may be limited during runtime using
   ``max_sqb_count`` ``devargs`` parameter.

   For example::

      -w 0002:02:00.0,max_sqb_count=64

   With the above configuration, each send queue's decscriptor buffer count is
   limited to a maximum of 64 buffers.


.. note::

   Above devarg parameters are configurable per device, user needs to pass the
   parameters to all the PCIe devices if application requires to configure on
   all the ethdev ports.

Limitations
-----------

``mempool_octeontx2`` external mempool handler dependency
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The OCTEON TX2 SoC family NIC has inbuilt HW assisted external mempool manager.
``net_octeontx2`` pmd only works with ``mempool_octeontx2`` mempool handler
as it is performance wise most effective way for packet allocation and Tx buffer
recycling on OCTEON TX2 SoC platform.

CRC striping
~~~~~~~~~~~~

The OCTEON TX2 SoC family NICs strip the CRC for every packet being received by
the host interface irrespective of the offload configuration.


Debugging Options
-----------------

.. _table_octeontx2_ethdev_debug_options:

.. table:: OCTEON TX2 ethdev debug options

   +---+------------+-------------------------------------------------------+
   | # | Component  | EAL log command                                       |
   +===+============+=======================================================+
   | 1 | NIX        | --log-level='pmd\.net.octeontx2,8'                    |
   +---+------------+-------------------------------------------------------+
   | 2 | NPC        | --log-level='pmd\.net.octeontx2\.flow,8'              |
   +---+------------+-------------------------------------------------------+

RTE Flow Support
----------------

The OCTEON TX2 SoC family NIC has support for the following patterns and
actions.

Patterns:

.. _table_octeontx2_supported_flow_item_types:

.. table:: Item types

   +----+--------------------------------+
   | #  | Pattern Type                   |
   +====+================================+
   | 1  | RTE_FLOW_ITEM_TYPE_ETH         |
   +----+--------------------------------+
   | 2  | RTE_FLOW_ITEM_TYPE_VLAN        |
   +----+--------------------------------+
   | 3  | RTE_FLOW_ITEM_TYPE_E_TAG       |
   +----+--------------------------------+
   | 4  | RTE_FLOW_ITEM_TYPE_IPV4        |
   +----+--------------------------------+
   | 5  | RTE_FLOW_ITEM_TYPE_IPV6        |
   +----+--------------------------------+
   | 6  | RTE_FLOW_ITEM_TYPE_ARP_ETH_IPV4|
   +----+--------------------------------+
   | 7  | RTE_FLOW_ITEM_TYPE_MPLS        |
   +----+--------------------------------+
   | 8  | RTE_FLOW_ITEM_TYPE_ICMP        |
   +----+--------------------------------+
   | 9  | RTE_FLOW_ITEM_TYPE_UDP         |
   +----+--------------------------------+
   | 10 | RTE_FLOW_ITEM_TYPE_TCP         |
   +----+--------------------------------+
   | 11 | RTE_FLOW_ITEM_TYPE_SCTP        |
   +----+--------------------------------+
   | 12 | RTE_FLOW_ITEM_TYPE_ESP         |
   +----+--------------------------------+
   | 13 | RTE_FLOW_ITEM_TYPE_GRE         |
   +----+--------------------------------+
   | 14 | RTE_FLOW_ITEM_TYPE_NVGRE       |
   +----+--------------------------------+
   | 15 | RTE_FLOW_ITEM_TYPE_VXLAN       |
   +----+--------------------------------+
   | 16 | RTE_FLOW_ITEM_TYPE_GTPC        |
   +----+--------------------------------+
   | 17 | RTE_FLOW_ITEM_TYPE_GTPU        |
   +----+--------------------------------+
   | 18 | RTE_FLOW_ITEM_TYPE_GENEVE      |
   +----+--------------------------------+
   | 19 | RTE_FLOW_ITEM_TYPE_VXLAN_GPE   |
   +----+--------------------------------+
   | 20 | RTE_FLOW_ITEM_TYPE_IPV6_EXT    |
   +----+--------------------------------+
   | 21 | RTE_FLOW_ITEM_TYPE_VOID        |
   +----+--------------------------------+
   | 22 | RTE_FLOW_ITEM_TYPE_ANY         |
   +----+--------------------------------+
   | 23 | RTE_FLOW_ITEM_TYPE_GRE_KEY     |
   +----+--------------------------------+

.. note::

   ``RTE_FLOW_ITEM_TYPE_GRE_KEY`` works only when checksum and routing
   bits in the GRE header are equal to 0.

Actions:

.. _table_octeontx2_supported_ingress_action_types:

.. table:: Ingress action types

   +----+--------------------------------+
   | #  | Action Type                    |
   +====+================================+
   | 1  | RTE_FLOW_ACTION_TYPE_VOID      |
   +----+--------------------------------+
   | 2  | RTE_FLOW_ACTION_TYPE_MARK      |
   +----+--------------------------------+
   | 3  | RTE_FLOW_ACTION_TYPE_FLAG      |
   +----+--------------------------------+
   | 4  | RTE_FLOW_ACTION_TYPE_COUNT     |
   +----+--------------------------------+
   | 5  | RTE_FLOW_ACTION_TYPE_DROP      |
   +----+--------------------------------+
   | 6  | RTE_FLOW_ACTION_TYPE_QUEUE     |
   +----+--------------------------------+
   | 7  | RTE_FLOW_ACTION_TYPE_RSS       |
   +----+--------------------------------+
   | 8  | RTE_FLOW_ACTION_TYPE_SECURITY  |
   +----+--------------------------------+
   | 9  | RTE_FLOW_ACTION_TYPE_PF        |
   +----+--------------------------------+
   | 10 | RTE_FLOW_ACTION_TYPE_VF        |
   +----+--------------------------------+

.. _table_octeontx2_supported_egress_action_types:

.. table:: Egress action types

   +----+--------------------------------+
   | #  | Action Type                    |
   +====+================================+
   | 1  | RTE_FLOW_ACTION_TYPE_COUNT     |
   +----+--------------------------------+
   | 2  | RTE_FLOW_ACTION_TYPE_DROP      |
   +----+--------------------------------+
