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SPDX-License-Identifier: BSD-3-Clause + Copyright 2016 NXP + + +DPAA2 Poll Mode Driver +====================== + +The DPAA2 NIC PMD (**librte_pmd_dpaa2**) provides poll mode driver +support for the inbuilt NIC found in the **NXP DPAA2** SoC family. + +More information can be found at `NXP Official Website +<http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/qoriq-arm-processors:QORIQ-ARM>`_. + +NXP DPAA2 (Data Path Acceleration Architecture Gen2) +---------------------------------------------------- + +This section provides an overview of the NXP DPAA2 architecture +and how it is integrated into the DPDK. + +Contents summary + +- DPAA2 overview +- Overview of DPAA2 objects +- DPAA2 driver architecture overview + +.. _dpaa2_overview: + +DPAA2 Overview +~~~~~~~~~~~~~~ + +Reference: `FSL MC BUS in Linux Kernel <https://www.kernel.org/doc/readme/drivers-staging-fsl-mc-README.txt>`_. + +DPAA2 is a hardware architecture designed for high-speed network +packet processing. DPAA2 consists of sophisticated mechanisms for +processing Ethernet packets, queue management, buffer management, +autonomous L2 switching, virtual Ethernet bridging, and accelerator +(e.g. crypto) sharing. + +A DPAA2 hardware component called the Management Complex (or MC) manages the +DPAA2 hardware resources. The MC provides an object-based abstraction for +software drivers to use the DPAA2 hardware. + +The MC uses DPAA2 hardware resources such as queues, buffer pools, and +network ports to create functional objects/devices such as network +interfaces, an L2 switch, or accelerator instances. + +The MC provides memory-mapped I/O command interfaces (MC portals) +which DPAA2 software drivers use to operate on DPAA2 objects: + +The diagram below shows an overview of the DPAA2 resource management +architecture: + +.. code-block:: console + + +--------------------------------------+ + | OS | + | DPAA2 drivers | + | | | + +-----------------------------|--------+ + | + | (create,discover,connect + | config,use,destroy) + | + DPAA2 | + +------------------------| mc portal |-+ + | | | + | +- - - - - - - - - - - - -V- - -+ | + | | | | + | | Management Complex (MC) | | + | | | | + | +- - - - - - - - - - - - - - - -+ | + | | + | Hardware Hardware | + | Resources Objects | + | --------- ------- | + | -queues -DPRC | + | -buffer pools -DPMCP | + | -Eth MACs/ports -DPIO | + | -network interface -DPNI | + | profiles -DPMAC | + | -queue portals -DPBP | + | -MC portals ... | + | ... | + | | + +--------------------------------------+ + +The MC mediates operations such as create, discover, +connect, configuration, and destroy. Fast-path operations +on data, such as packet transmit/receive, are not mediated by +the MC and are done directly using memory mapped regions in +DPIO objects. + +Overview of DPAA2 Objects +~~~~~~~~~~~~~~~~~~~~~~~~~ + +The section provides a brief overview of some key DPAA2 objects. +A simple scenario is described illustrating the objects involved +in creating a network interfaces. + +DPRC (Datapath Resource Container) + + A DPRC is a container object that holds all the other + types of DPAA2 objects. In the example diagram below there + are 8 objects of 5 types (DPMCP, DPIO, DPBP, DPNI, and DPMAC) + in the container. + +.. code-block:: console + + +---------------------------------------------------------+ + | DPRC | + | | + | +-------+ +-------+ +-------+ +-------+ +-------+ | + | | DPMCP | | DPIO | | DPBP | | DPNI | | DPMAC | | + | +-------+ +-------+ +-------+ +---+---+ +---+---+ | + | | DPMCP | | DPIO | | + | +-------+ +-------+ | + | | DPMCP | | + | +-------+ | + | | + +---------------------------------------------------------+ + +From the point of view of an OS, a DPRC behaves similar to a plug and +play bus, like PCI. DPRC commands can be used to enumerate the contents +of the DPRC, discover the hardware objects present (including mappable +regions and interrupts). + +.. code-block:: console + + DPRC.1 (bus) + | + +--+--------+-------+-------+-------+ + | | | | | + DPMCP.1 DPIO.1 DPBP.1 DPNI.1 DPMAC.1 + DPMCP.2 DPIO.2 + DPMCP.3 + +Hardware objects can be created and destroyed dynamically, providing +the ability to hot plug/unplug objects in and out of the DPRC. + +A DPRC has a mappable MMIO region (an MC portal) that can be used +to send MC commands. It has an interrupt for status events (like +hotplug). + +All objects in a container share the same hardware "isolation context". +This means that with respect to an IOMMU the isolation granularity +is at the DPRC (container) level, not at the individual object +level. + +DPRCs can be defined statically and populated with objects +via a config file passed to the MC when firmware starts +it. There is also a Linux user space tool called "restool" +that can be used to create/destroy containers and objects +dynamically. + +DPAA2 Objects for an Ethernet Network Interface +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +A typical Ethernet NIC is monolithic-- the NIC device contains TX/RX +queuing mechanisms, configuration mechanisms, buffer management, +physical ports, and interrupts. DPAA2 uses a more granular approach +utilizing multiple hardware objects. Each object provides specialized +functions. Groups of these objects are used by software to provide +Ethernet network interface functionality. This approach provides +efficient use of finite hardware resources, flexibility, and +performance advantages. + +The diagram below shows the objects needed for a simple +network interface configuration on a system with 2 CPUs. + +.. code-block:: console + + +---+---+ +---+---+ + CPU0 CPU1 + +---+---+ +---+---+ + | | + +---+---+ +---+---+ + DPIO DPIO + +---+---+ +---+---+ + \ / + \ / + \ / + +---+---+ + DPNI --- DPBP,DPMCP + +---+---+ + | + | + +---+---+ + DPMAC + +---+---+ + | + port/PHY + +Below the objects are described. For each object a brief description +is provided along with a summary of the kinds of operations the object +supports and a summary of key resources of the object (MMIO regions +and IRQs). + +DPMAC (Datapath Ethernet MAC): represents an Ethernet MAC, a +hardware device that connects to an Ethernet PHY and allows +physical transmission and reception of Ethernet frames. + +- MMIO regions: none +- IRQs: DPNI link change +- commands: set link up/down, link config, get stats, IRQ config, enable, reset + +DPNI (Datapath Network Interface): contains TX/RX queues, +network interface configuration, and RX buffer pool configuration +mechanisms. The TX/RX queues are in memory and are identified by +queue number. + +- MMIO regions: none +- IRQs: link state +- commands: port config, offload config, queue config, parse/classify config, IRQ config, enable, reset + +DPIO (Datapath I/O): provides interfaces to enqueue and dequeue +packets and do hardware buffer pool management operations. The DPAA2 +architecture separates the mechanism to access queues (the DPIO object) +from the queues themselves. The DPIO provides an MMIO interface to +enqueue/dequeue packets. To enqueue something a descriptor is written +to the DPIO MMIO region, which includes the target queue number. +There will typically be one DPIO assigned to each CPU. This allows all +CPUs to simultaneously perform enqueue/dequeued operations. DPIOs are +expected to be shared by different DPAA2 drivers. + +- MMIO regions: queue operations, buffer management +- IRQs: data availability, congestion notification, buffer pool depletion +- commands: IRQ config, enable, reset + +DPBP (Datapath Buffer Pool): represents a hardware buffer +pool. + +- MMIO regions: none +- IRQs: none +- commands: enable, reset + +DPMCP (Datapath MC Portal): provides an MC command portal. +Used by drivers to send commands to the MC to manage +objects. + +- MMIO regions: MC command portal +- IRQs: command completion +- commands: IRQ config, enable, reset + +Object Connections +~~~~~~~~~~~~~~~~~~ + +Some objects have explicit relationships that must +be configured: + +- DPNI <--> DPMAC +- DPNI <--> DPNI +- DPNI <--> L2-switch-port + +A DPNI must be connected to something such as a DPMAC, +another DPNI, or L2 switch port. The DPNI connection +is made via a DPRC command. + +.. code-block:: console + + +-------+ +-------+ + | DPNI | | DPMAC | + +---+---+ +---+---+ + | | + +==========+ + +- DPNI <--> DPBP + +A network interface requires a 'buffer pool' (DPBP object) which provides +a list of pointers to memory where received Ethernet data is to be copied. +The Ethernet driver configures the DPBPs associated with the network +interface. + +Interrupts +~~~~~~~~~~ + +All interrupts generated by DPAA2 objects are message +interrupts. At the hardware level message interrupts +generated by devices will normally have 3 components-- +1) a non-spoofable 'device-id' expressed on the hardware +bus, 2) an address, 3) a data value. + +In the case of DPAA2 devices/objects, all objects in the +same container/DPRC share the same 'device-id'. +For ARM-based SoC this is the same as the stream ID. + + +DPAA2 DPDK - Poll Mode Driver Overview +-------------------------------------- + +This section provides an overview of the drivers for +DPAA2-- 1) the bus driver and associated "DPAA2 infrastructure" +drivers and 2) functional object drivers (such as Ethernet). + +As described previously, a DPRC is a container that holds the other +types of DPAA2 objects. It is functionally similar to a plug-and-play +bus controller. + +Each object in the DPRC is a Linux "device" and is bound to a driver. +The diagram below shows the dpaa2 drivers involved in a networking +scenario and the objects bound to each driver. A brief description +of each driver follows. + +.. code-block: console + + + +------------+ + | DPDK DPAA2 | + | PMD | + +------------+ +------------+ + | Ethernet |.......| Mempool | + . . . . . . . . . | (DPNI) | | (DPBP) | + . +---+---+----+ +-----+------+ + . ^ | . + . | |<enqueue, . + . | | dequeue> . + . | | . + . +---+---V----+ . + . . . . . . . . . . .| DPIO driver| . + . . | (DPIO) | . + . . +-----+------+ . + . . | QBMAN | . + . . | Driver | . + +----+------+-------+ +-----+----- | . + | dpaa2 bus | | . + | VFIO fslmc-bus |....................|..................... + | | | + | /bus/fslmc | | + +-------------------+ | + | + ========================== HARDWARE =====|======================= + DPIO + | + DPNI---DPBP + | + DPMAC + | + PHY + =========================================|======================== + + +A brief description of each driver is provided below. + +DPAA2 bus driver +~~~~~~~~~~~~~~~~ + +The DPAA2 bus driver is a rte_bus driver which scans the fsl-mc bus. +Key functions include: + +- Reading the container and setting up vfio group +- Scanning and parsing the various MC objects and adding them to + their respective device list. + +Additionally, it also provides the object driver for generic MC objects. + +DPIO driver +~~~~~~~~~~~ + +The DPIO driver is bound to DPIO objects and provides services that allow +other drivers such as the Ethernet driver to enqueue and dequeue data for +their respective objects. +Key services include: + +- Data availability notifications +- Hardware queuing operations (enqueue and dequeue of data) +- Hardware buffer pool management + +To transmit a packet the Ethernet driver puts data on a queue and +invokes a DPIO API. For receive, the Ethernet driver registers +a data availability notification callback. To dequeue a packet +a DPIO API is used. + +There is typically one DPIO object per physical CPU for optimum +performance, allowing different CPUs to simultaneously enqueue +and dequeue data. + +The DPIO driver operates on behalf of all DPAA2 drivers +active -- Ethernet, crypto, compression, etc. + +DPBP based Mempool driver +~~~~~~~~~~~~~~~~~~~~~~~~~ + +The DPBP driver is bound to a DPBP objects and provides services to +create a hardware offloaded packet buffer mempool. + +DPAA2 NIC Driver +~~~~~~~~~~~~~~~~ +The Ethernet driver is bound to a DPNI and implements the kernel +interfaces needed to connect the DPAA2 network interface to +the network stack. + +Each DPNI corresponds to a DPDK network interface. + +Features +^^^^^^^^ + +Features of the DPAA2 PMD are: + +- Multiple queues for TX and RX +- Receive Side Scaling (RSS) +- MAC/VLAN filtering +- Packet type information +- Checksum offload +- Promiscuous mode +- Multicast mode +- Port hardware statistics +- Jumbo frames +- Link flow control +- Scattered and gather for TX and RX + +Supported DPAA2 SoCs +-------------------- +- LX2160A +- LS2084A/LS2044A +- LS2088A/LS2048A +- LS1088A/LS1048A + +Prerequisites +------------- + +See :doc:`../platform/dpaa2` for setup information + +Currently supported by DPDK: + +- NXP LSDK **19.08+**. +- MC Firmware version **10.18.0** and higher. +- Supported architectures: **arm64 LE**. + +- Follow the DPDK :ref:`Getting Started Guide for Linux <linux_gsg>` to setup the basic DPDK environment. + +.. note:: + + Some part of fslmc bus code (mc flib - object library) routines are + dual licensed (BSD & GPLv2), however they are used as BSD in DPDK in userspace. + +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_FSLMC_BUS`` (default ``y``) + + Toggle compilation of the ``librte_bus_fslmc`` driver. + +- ``CONFIG_RTE_LIBRTE_DPAA2_PMD`` (default ``y``) + + Toggle compilation of the ``librte_pmd_dpaa2`` driver. + +- ``CONFIG_RTE_LIBRTE_DPAA2_DEBUG_DRIVER`` (default ``n``) + + Toggle display of debugging messages/logic + +- ``CONFIG_RTE_LIBRTE_DPAA2_USE_PHYS_IOVA`` (default ``n``) + + Toggle to use physical address vs virtual address for hardware accelerators. + +Driver compilation and testing +------------------------------ + +Refer to the document :ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>` +for details. + +#. 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 + + ./testpmd -c 0xff -n 1 -- -i --portmask=0x3 --nb-cores=1 --no-flush-rx + + ..... + EAL: Registered [pci] bus. + EAL: Registered [fslmc] bus. + EAL: Detected 8 lcore(s) + EAL: Probing VFIO support... + EAL: VFIO support initialized + ..... + PMD: DPAA2: Processing Container = dprc.2 + EAL: fslmc: DPRC contains = 51 devices + EAL: fslmc: Bus scan completed + ..... + Configuring Port 0 (socket 0) + Port 0: 00:00:00:00:00:01 + Configuring Port 1 (socket 0) + Port 1: 00:00:00:00:00:02 + ..... + Checking link statuses... + Port 0 Link Up - speed 10000 Mbps - full-duplex + Port 1 Link Up - speed 10000 Mbps - full-duplex + Done + testpmd> + + +* Use dev arg option ``drv_loopback=1`` to loopback packets at + driver level. Any packet received will be reflected back by the + driver on same port. e.g. ``fslmc:dpni.1,drv_loopback=1`` + +* Use dev arg option ``drv_no_prefetch=1`` to disable prefetching + of the packet pull command which is issued in the previous cycle. + e.g. ``fslmc:dpni.1,drv_no_prefetch=1`` + +Enabling logs +------------- + +For enabling logging for DPAA2 PMD, following log-level prefix can be used: + + .. code-block:: console + + <dpdk app> <EAL args> --log-level=bus.fslmc:<level> -- ... + +Using ``bus.fslmc`` as log matching criteria, all FSLMC bus logs can be enabled +which are lower than logging ``level``. + + Or + + .. code-block:: console + + <dpdk app> <EAL args> --log-level=pmd.net.dpaa2:<level> -- ... + +Using ``pmd.net.dpaa2`` as log matching criteria, all PMD logs can be enabled +which are lower than logging ``level``. + +Whitelisting & Blacklisting +--------------------------- + +For blacklisting a DPAA2 device, following commands can be used. + + .. code-block:: console + + <dpdk app> <EAL args> -b "fslmc:dpni.x" -- ... + +Where x is the device object id as configured in resource container. + +Limitations +----------- + +Platform Requirement +~~~~~~~~~~~~~~~~~~~~ +DPAA2 drivers for DPDK can only work on NXP SoCs as listed in the +``Supported DPAA2 SoCs``. + +Maximum packet length +~~~~~~~~~~~~~~~~~~~~~ + +The DPAA2 SoC family support a maximum of a 10240 jumbo frame. The value +is fixed and cannot be changed. So, even when the ``rxmode.max_rx_pkt_len`` +member of ``struct rte_eth_conf`` is set to a value lower than 10240, frames +up to 10240 bytes can still reach the host interface. + +Other Limitations +~~~~~~~~~~~~~~~~~ + +- RSS hash key cannot be modified. +- RSS RETA cannot be configured. |