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authorShreyansh Jain <shreyansh.jain@nxp.com>2017-09-28 17:59:37 +0530
committerFerruh Yigit <ferruh.yigit@intel.com>2017-10-06 02:49:50 +0200
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doc: add NXP DPAA PMD documentation
Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com> Signed-off-by: Shreyansh Jain <shreyansh.jain@nxp.com>
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+.. BSD LICENSE
+ Copyright 2017 NXP.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of NXP nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+DPAA Poll Mode Driver
+=====================
+
+The DPAA NIC PMD (**librte_pmd_dpaa**) provides poll mode driver
+support for the inbuilt NIC found in the **NXP DPAA** 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 DPAA (Data Path Acceleration Architecture - Gen 1)
+------------------------------------------------------
+
+This section provides an overview of the NXP DPAA architecture
+and how it is integrated into the DPDK.
+
+Contents summary
+
+- DPAA overview
+- DPAA driver architecture overview
+
+.. _dpaa_overview:
+
+DPAA Overview
+~~~~~~~~~~~~~
+
+Reference: `FSL DPAA Architecture <http://www.nxp.com/assets/documents/data/en/white-papers/QORIQDPAAWP.pdf>`_.
+
+The QorIQ Data Path Acceleration Architecture (DPAA) is a set of hardware
+components on specific QorIQ series multicore processors. This architecture
+provides the infrastructure to support simplified sharing of networking
+interfaces and accelerators by multiple CPU cores, and the accelerators
+themselves.
+
+DPAA includes:
+
+- Cores
+- Network and packet I/O
+- Hardware offload accelerators
+- Infrastructure required to facilitate flow of packets between the components above
+
+Infrastructure components are:
+
+- The Queue Manager (QMan) is a hardware accelerator that manages frame queues.
+ It allows CPUs and other accelerators connected to the SoC datapath to
+ enqueue and dequeue ethernet frames, thus providing the infrastructure for
+ data exchange among CPUs and datapath accelerators.
+- The Buffer Manager (BMan) is a hardware buffer pool management block that
+ allows software and accelerators on the datapath to acquire and release
+ buffers in order to build frames.
+
+Hardware accelerators are:
+
+- SEC - Cryptographic accelerator
+- PME - Pattern matching engine
+
+The Network and packet I/O component:
+
+- The Frame Manager (FMan) is a key component in the DPAA and makes use of the
+ DPAA infrastructure (QMan and BMan). FMan is responsible for packet
+ distribution and policing. Each frame can be parsed, classified and results
+ may be attached to the frame. This meta data can be used to select
+ particular QMan queue, which the packet is forwarded to.
+
+
+DPAA DPDK - Poll Mode Driver Overview
+-------------------------------------
+
+This section provides an overview of the drivers for DPAA:
+
+* Bus driver and associated "DPAA infrastructure" drivers
+* Functional object drivers (such as Ethernet).
+
+Brief description of each driver is provided in layout below as well as
+in the following sections.
+
+.. code-block:: console
+
+ +------------+
+ | DPDK DPAA |
+ | PMD |
+ +-----+------+
+ |
+ +-----+------+ +---------------+
+ : Ethernet :.......| DPDK DPAA |
+ . . . . . . . . . : (FMAN) : | Mempool driver|
+ . +---+---+----+ | (BMAN) |
+ . ^ | +-----+---------+
+ . | |<enqueue, .
+ . | | dequeue> .
+ . | | .
+ . +---+---V----+ .
+ . . . . . . . . . . .: Portal drv : .
+ . . : : .
+ . . +-----+------+ .
+ . . : QMAN : .
+ . . : Driver : .
+ +----+------+-------+ +-----+------+ .
+ | DPDK DPAA Bus | | .
+ | driver |....................|.....................
+ | /bus/dpaa | |
+ +-------------------+ |
+ |
+ ========================== HARDWARE =====|========================
+ PHY
+ =========================================|========================
+
+In the above representation, solid lines represent components which interface
+with DPDK RTE Framework and dotted lines represent DPAA internal components.
+
+DPAA Bus driver
+~~~~~~~~~~~~~~~
+
+The DPAA bus driver is a ``rte_bus`` driver which scans the platform like bus.
+Key functions include:
+
+- Scanning and parsing the various objects and adding them to their respective
+ device list.
+- Performing probe for available drivers against each scanned device
+- Creating necessary ethernet instance before passing control to the PMD
+
+DPAA NIC Driver (PMD)
+~~~~~~~~~~~~~~~~~~~~~
+
+DPAA PMD is traditional DPDK PMD which provides necessary interface between
+RTE framework and DPAA internal components/drivers.
+
+- Once devices have been identified by DPAA Bus, each device is associated
+ with the PMD
+- PMD is responsible for implementing necessary glue layer between RTE APIs
+ and lower level QMan and FMan blocks.
+ The Ethernet driver is bound to a FMAN port and implements the interfaces
+ needed to connect the DPAA network interface to the network stack.
+ Each FMAN Port corresponds to a DPDK network interface.
+
+
+Features
+^^^^^^^^
+
+ Features of the DPAA PMD are:
+
+ - Multiple queues for TX and RX
+ - Receive Side Scaling (RSS)
+ - Packet type information
+ - Checksum offload
+ - Promiscuous mode
+
+DPAA Mempool Driver
+~~~~~~~~~~~~~~~~~~~
+
+DPAA has a hardware offloaded buffer pool manager, called BMan, or Buffer
+Manager.
+
+- Using standard Mempools operations RTE API, the mempool driver interfaces
+ with RTE to service each mempool creation, deletion, buffer allocation and
+ deallocation requests.
+- Each FMAN instance has a BMan pool attached to it during initialization.
+ Each Tx frame can be automatically released by hardware, if allocated from
+ this pool.
+
+
+Supported DPAA SoCs
+-------------------
+
+- LS1043A/LS1023A
+- LS1046A/LS1026A
+
+Prerequisites
+-------------
+
+There are three main pre-requisities for executing DPAA PMD on a DPAA
+compatible board:
+
+1. **ARM 64 Tool Chain**
+
+ For example, the `*aarch64* Linaro Toolchain <https://releases.linaro.org/components/toolchain/binaries/4.9-2017.01/aarch64-linux-gnu>`_.
+
+2. **Linux Kernel**
+
+ It can be obtained from `NXP's Github hosting <https://github.com/qoriq-open-source/linux>`_.
+
+3. **Rootfile system**
+
+ Any *aarch64* supporting filesystem can be used. For example,
+ Ubuntu 15.10 (Wily) or 16.04 LTS (Xenial) userland which can be obtained
+ from `here <http://cdimage.ubuntu.com/ubuntu-base/releases/16.04/release/ubuntu-base-16.04.1-base-arm64.tar.gz>`_.
+
+4. **FMC Tool**
+
+ Before any DPDK application can be executed, the Frame Manager Configuration
+ Tool (FMC) need to be executed to set the configurations of the queues. This
+ includes the queue state, RSS and other policies.
+ This tool can be obtained from `NXP (Freescale) Public Git Repository <http://git.freescale.com/git/cgit.cgi/ppc/sdk/fmc.git>`_.
+ This tool needs configuration files which are available in the
+ :ref:`DPDK Extra Scripts <extra_scripts>`, described below.
+
+As an alternative method, DPAA PMD can also be executed using images provided
+as part of SDK from NXP. The SDK includes all the above prerequisites necessary
+to bring up a DPAA board.
+
+The following dependencies are not part of DPDK and must be installed
+separately:
+
+- **NXP Linux SDK**
+
+ NXP Linux software development kit (SDK) includes support for family
+ of QorIQ® ARM-Architecture-based system on chip (SoC) processors
+ and corresponding boards.
+
+ It includes the Linux board support packages (BSPs) for NXP SoCs,
+ a fully operational tool chain, kernel and board specific modules.
+
+ SDK and related information can be obtained from: `NXP QorIQ SDK <http://www.nxp.com/products/software-and-tools/run-time-software/linux-sdk/linux-sdk-for-qoriq-processors:SDKLINUX>`_.
+
+
+.. _extra_scripts:
+
+- **DPDK Extra Scripts**
+
+ DPAA based resources can be configured easily with the help of ready scripts
+ as provided in the DPDK Extra repository.
+
+ `DPDK Extras Scripts <https://github.com/qoriq-open-source/dpdk-extras>`_.
+
+Currently supported by DPDK:
+
+- NXP SDK **2.0+**.
+- 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 dpaa bus code (qbman and fman - library) routines are
+ dual licensed (BSD & GPLv2).
+
+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_DPAA_BUS`` (default ``n``)
+
+ By default it is enabled only for defconfig_arm64-dpaa-* config.
+ Toggle compilation of the ``librte_bus_dpaa`` driver.
+
+- ``CONFIG_RTE_LIBRTE_DPAA_PMD`` (default ``n``)
+
+ By default it is enabled only for defconfig_arm64-dpaa-* config.
+ Toggle compilation of the ``librte_pmd_dpaa`` driver.
+
+- ``CONFIG_RTE_LIBRTE_DPAA_DEBUG_DRIVER`` (default ``n``)
+
+ Toggles display of bus configurations and enables a debugging queue
+ to fetch error (Rx/Tx) packets to driver. By default, packets with errors
+ (like wrong checksum) are dropped by the hardware.
+
+- ``CONFIG_RTE_LIBRTE_DPAA_HWDEBUG`` (default ``n``)
+
+ Enables debugging of the Queue and Buffer Manager layer which interacts
+ with the DPAA hardware.
+
+- ``CONFIG_RTE_MBUF_DEFAULT_MEMPOOL_OPS`` (default ``dpaa``)
+
+ This is not a DPAA specific configuration - it is a generic RTE config.
+ For optimal performance and hardware utilization, it is expected that DPAA
+ Mempool driver is used for mempools. For that, this configuration needs to
+ enabled.
+
+Environment Variables
+~~~~~~~~~~~~~~~~~~~~~
+
+DPAA drivers uses the following environment variables to configure its
+state during application initialization:
+
+- ``DPAA_NUM_RX_QUEUES`` (default 1)
+
+ This defines the number of Rx queues configured for an application, per
+ port. Hardware would distribute across these many number of queues on Rx
+ of packets.
+ In case the application is configured to use lesser number of queues than
+ configured above, it might result in packet loss (because of distribution).
+
+
+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
+
+ ./arm64-dpaa-linuxapp-gcc/testpmd -c 0xff -n 1 \
+ -- -i --portmask=0x3 --nb-cores=1 --no-flush-rx
+
+ .....
+ EAL: Registered [pci] bus.
+ EAL: Registered [dpaa] bus.
+ EAL: Detected 4 lcore(s)
+ .....
+ EAL: dpaa: 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>
+
+Limitations
+-----------
+
+Platform Requirement
+~~~~~~~~~~~~~~~~~~~~
+
+DPAA drivers for DPDK can only work on NXP SoCs as listed in the
+``Supported DPAA SoCs``.
+
+Maximum packet length
+~~~~~~~~~~~~~~~~~~~~~
+
+The DPAA 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.
+
+Multiprocess Support
+~~~~~~~~~~~~~~~~~~~~
+
+Current version of DPAA driver doesn't support multi-process applications
+where I/O is performed using secondary processes. This feature would be
+implemented in subsequent versions.