[dpdk-dev] [PATCH] doc: introduce openwrt how-to guide

[Ye Xiaolong]

On 11/29, Stephen Hemminger wrote:
>On Fri, 29 Nov 2019 16:19:11 +0800
>Xiaolong Ye <xiaolong.ye at intel.com> wrote:
>
>> This doc describes how to enable DPDK on openwrt in both virtual and
>> physical x86 environment.
>> 
>> Signed-off-by: Xiaolong Ye <xiaolong.ye at intel.com>
>> ---
>>  doc/guides/howto/index.rst   |   1 +
>>  doc/guides/howto/openwrt.rst | 180 +++++++++++++++++++++++++++++++++++
>>  2 files changed, 181 insertions(+)
>>  create mode 100644 doc/guides/howto/openwrt.rst
>> 
>> diff --git a/doc/guides/howto/index.rst b/doc/guides/howto/index.rst
>> index a4c131652..5a97ea508 100644
>> --- a/doc/guides/howto/index.rst
>> +++ b/doc/guides/howto/index.rst
>> @@ -19,3 +19,4 @@ HowTo Guides
>>      packet_capture_framework
>>      telemetry
>>      debug_troubleshoot
>> +    openwrt
>> diff --git a/doc/guides/howto/openwrt.rst b/doc/guides/howto/openwrt.rst
>> new file mode 100644
>> index 000000000..62be3a031
>> --- /dev/null
>> +++ b/doc/guides/howto/openwrt.rst
>> @@ -0,0 +1,180 @@
>> +..  SPDX-License-Identifier: BSD-3-Clause
>> +    Copyright(c) 2019 Intel Corporation.
>> +
>> +Enable DPDK on openwrt
>> +======================
>> +
>> +This document describes how to enable Data Plane Development Kit(DPDK) on
>> +Openwrt in both virtual and physical x86 environment.
>> +
>> +Introduction
>> +------------
>> +
>> +The OpenWrt project is a Linux operating system targeting embedded devices.
>> +Instead of trying to create a single, static firmware, OpenWrt provides a fully
>> +writable filesystem with package management. This frees user from the
>> +application selection and configuration provided by the vendor and allows user
>> +to customize the device through the use of packages to suit any application. For
>> +developers, OpenWrt is the framework to build and application without having to
>> +build a complete firmware around it, for users this means the ability for full
>> +customization, to use the device in ways never envisioned.
>> +
>> +Pre-requisites
>> +~~~~~~~~~~~~~~
>> +
>> +You need gcc, binutils, bzip2, flex, python3.5+, perl, make, find, grep, diff,
>> +unzip, gawk, getopt, subversion, libz-dev and libc headers installed.
>> +
>> +Build OpenWrt
>> +-------------
>> +
>> +You can obtain OpenWrt image through https://downloads.openwrt.org/releases. To
>> +fully customize your own OpenWrt, it is highly recommended to build it through
>> +the source code, you can clone the OpenWrt source code by:
>> +
>> +.. code-block:: console
>> +
>> +	git clone https://git.openwrt.org/openwrt/openwrt.git
>> +
>> +OpenWrt configuration
>> +~~~~~~~~~~~~~~~~~~~~~
>> +
>> +* Select ``x86`` in ``Target System``
>> +* Select ``x86_64`` in ``Subtarget``
>> +* Select ``Build the OpenWrt SDK`` for cross-compilation environment
>> +* Select ``Use glibc`` in ``Advanced configuration options (for developers)``
>> +			   -> ``ToolChain Options``
>> +			   -> ``C Library implementation``
>> +
>> +Kernel configuration
>> +~~~~~~~~~~~~~~~~~~~~
>> +
>> +Below configurations need to be enabled:
>> +
>> +* CONFIG_UIO=y
>> +* CONFIG_HUGETLBFS=y
>> +* CONFIG_HUGETLB_PAGE=y
>> +* CONFIG_PAGE_MONITOR=y
>> +
>> +Build steps
>> +~~~~~~~~~~~
>> +
>> +1. Run ``./scripts/feeds update -a`` to obtain all the latest package definitions
>> +defined in feeds.conf / feeds.conf.default
>> +
>> +2. Run ``./scripts/feeds install -a`` to install symlinks for all obtained
>> +packages into package/feeds/
>> +
>> +3. Run ``make menuconfig`` to select preferred configuration mentioned above for
>> +the toolchain, target system & firmware packages.
>> +
>> +3. Run ``make kernel_menuconfig`` to select preferred kernel configurations.
>> +
>> +4. Run ``make`` to build your firmware. This will download all sources, build
>> +the cross-compile toolchain and then cross-compile the Linux kernel & all
>> +chosen applications for your target system.
>> +
>> +After build is done, you can find the images and sdk in ``<OpenWrt Root>/bin/targets/x86/64-glibc/``.
>> +
>> +DPDK Cross Compilation for OpenWrt
>> +----------------------------------
>> +
>> +Pre-requisites
>> +~~~~~~~~~~~~~~
>> +
>> +NUMA is required to run dpdk in x86.
>> +
>> +.. note::
>> +
>> +   For compiling the NUMA lib, run libtool --version to ensure the libtool version >= 2.2,
>> +   otherwise the compilation will fail with errors.
>> +
>> +.. code-block:: console
>> +
>> +	git clone https://github.com/numactl/numactl.git
>> +	cd numactl
>> +	git checkout v2.0.13 -b v2.0.13
>> +	./autogen.sh
>> +	autoconf -i
>> +	export PATH=<OpenWrt sdk>/glibc/openwrt-sdk-x86-64_gcc-8.3.0_glibc.Linux-x86_64/staging_dir/toolchain-x86_64_gcc-8.3.0_glibc/bin/:$PATH
>> +	./configure CC=x86_64-openwrt-linux-gnu-gcc --prefix=<OpenWrt SDK toolchain dir>
>> +	make install
>> +
>> +The numa header files and lib file is generated in the include and lib folder respectively under <OpenWrt SDK toolchain dir>.
>> +
>> +Build DPDK
>> +~~~~~~~~~~
>> +
>> +.. code-block:: console
>> +
>> +	export STAGING_DIR=<OpenWrt sdk>/glibc/openwrt-sdk-x86-64_gcc-8.3.0_glibc.Linux-x86_64/staging_dir
>> +	export RTE_SDK=`pwd`
>> +	export RTE_KERNELDIR=<OpenWrt Root>/build_dir/target-x86_64_glibc/linux-x86_64/linux-4.19.81/
>> +	make config T=x86_64-native-linuxapp-gcc
>> +	make -j 100 CROSS=x86_64-openwrt-linux-gnu-
>> +
>> +Running DPDK application on OpenWrt
>> +-----------------------------------
>> +
>> +Virtual machine
>> +~~~~~~~~~~~~~~~
>> +
>> +* Extract boot image
>> +
>> +.. code-block:: console
>> +
>> +	gzip -d openwrt-x86-64-combined-ext4.img.gz
>> +
>> +* Launch Qemu
>> +
>> +.. code-block:: console
>> +
>> +	qemu-system-x86_64 \
>> +	        -cpu host \
>> +	        -smp 8 \
>> +	        -enable-kvm \
>> +	        -M q35 \
>> +	        -m 2048M \
>> +	        -object memory-backend-file,id=mem,size=2048M,mem-path=/tmp/hugepages,share=on \
>> +	        -drive file=<Your OpenWrt images folder>/openwrt-x86-64-combined-ext4.img,id=d0,if=none,bus=0,unit=0 \
>> +	        -device ide-hd,drive=d0,bus=ide.0 \
>> +	        -net nic,vlan=0 \
>> +	        -net nic,vlan=1 \
>> +	        -net user,vlan=1 \
>> +	        -display none \
>> +
>> +
>> +Physical machine
>> +~~~~~~~~~~~~~~~~
>> +
>> +Installation
>> +
>> +If you are using Windows PC, you can use some free and opensource raw disk image writer program such as
>> +``Win32 Disk Imager`` and ``Etcher`` to write OpenWrt image (openwrt-x86-64-combined-ext4.img) to a USB
>> +flash driver or USB SDcard with SDcard or a Sata hard drivre or SSD from your PC.
>> +
>> +If you are using Linux, you can use old dd tool to write OpenWrt image to the drive you want to write the
>> +image on.
>> +
>> +.. code-block:: console
>> +
>> +	dd if=openwrt-18.06.1-x86-64-combined-squashfs.img of=/dev/sdX
>> +
>> +Where sdX is name of the drive. (You can find it though ``fdisk -l``)
>> +
>> +Running DPDK
>> +~~~~~~~~~~~~
>> +
>> +* Setup dpdk environment
>> +
>> +  * Scp built numa libraries (including soft link) to /usr/lib64
>> +  * Setup hugepages
>> +  * insmod igb_uio.ko (scp the built igb_uio.ko first)
>> +  * Bind the NIC to igb_uio.ko
>> +
>> +* Launch testpmd
>> +
>> +  * scp built testpmd to qemu
>> +  * ./testpmd -c 0xf -- -i
>> +
>> + More detailed info about how to run a DPDK application refer to ``Running DPDK Applications`` section of :ref:`the DPDK documentation <linux_gsg>`.
>
>It is good to have more documentation and examples.
>My one concern is that a lot of this overlaps existing documents and is likely
>to get out of date.  Could you use links instead to describe how
>to install OpenWrt and how to run testpmd.

Make sense, I'll use links for those steps.

Thanks,
Xiaolong