docs: Add VPP inside the Cloud

This commit updates the VPP docs, adding the  VPP deployment and configuration inside the cloud

Change-Id: I97322deb57f0dfb1aa46cca301adbc91ce4a19f6
Signed-off-by: Francesco Spinelli <francescospinelli94@live.it>

1 files changed, 160 insertions, 0 deletions

diff --git a/docs/usecases/vppinazure.rst b/docs/usecases/vppinazure.rst
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+.. _vppinazure:
+
+.. toctree::
+
+VPP in Azure
+___________________
+
+
+
+
+Before starting, a few notes:
+
+* in our configuration we use only DPDK 18.02, since with the newer versions, such as DPDK 18.05, we obtained several problems during VPP installation (mostly related with MLX4 PMD Drivers). 
+
+* Some of the commands are taken from `Azure’s DPDK page <https://docs.microsoft.com/en-us/azure/virtual-network/setup-dpdk>`_.
+
+To bring DPDK inside Azure, we perform the following procedure:
+
+Firstly, we install the DPDK dependencies:
+
+.. code-block:: console
+
+ $ sudo add-apt-repository ppa:canonical-server/dpdk-azure –y
+ $ sudo apt-get update
+ $ sudo apt-get install -y librdmacm-dev librdmacm1 build-essential libnuma-dev libmnl-dev
+
+Then, we download DPDK 18.02:
+
+.. code-block:: console
+
+ $ sudo wget https://fast.dpdk.org/rel/dpdk-18.02.2.tar.xz
+ $ tar -xvf dpdk-18.02.2.tar.xz
+
+Finally, we build DPDK, modifying first its configuration files in order to make VPP compatible with MLX4 drivers:
+
+Inside config/common_base, modify:
+
+.. code-block:: console
+
+  CONFIG_RTE_BUILD_SHARED_LIB=n
+  CONFIG_RTE_LIBRTE_MLX4_PMD=y
+  CONFIG_RTE_LIBRTE_MLX4_DLOPEN_DEPS=y
+  CONFIG_RTE_LIBRTE_TAP_PMD=y
+  CONFIG_RTE_LIBRTE_FAILSAFE_PMD=y
+
+and then:
+
+.. code-block:: console
+
+ $ make config T=x86_64-native-linuxapp-gcc
+ $ sed -ri 's,(MLX._PMD=)n,\1y,' build/.config
+ $ make
+
+Finally we build DPDK:
+
+.. code-block:: console
+
+ $ make install T=x86_64-native-linuxapp-gcc DESTDIR=/home/ciscotest/test EXTRA_CFLAGS='-fPIC -pie'
+
+And we reboot the instance:
+
+.. code-block:: console
+
+ $ reboot istance
+
+After the reboot, we type these commands:
+
+.. code-block:: console
+
+ $ echo 1024 | sudo tee /sys/devices/system/node/node*/hugepages/hugepages-2048kB/nr_hugepages
+ $ mkdir /mnt/huge
+ $ sudo mount -t hugetlbfs nodev /mnt/huge
+ $ grep Huge /proc/meminfo
+ $ modprobe -a ib_uverbs
+ $ cd x86_64-native-linuxapp-gcc/
+ $ ls
+ $ cd lib/
+ $ ls
+ $ sudo cp librte_pmd_mlx4_glue.so.18.02.0 /usr/lib
+
+**Now we focus on VPP installation:**
+
+In our configuration we use VPP 18.07.
+
+We perform this procedure in order to install VPP 18.07 with an external DPDK configuration inside Azure.
+
+Firstly, we download VPP
+
+.. code-block:: console
+
+ $ git clone https://gerrit.fd.io/r/vpp
+ $ git checkout v18.07
+
+Then, we build VPP, using the external DPDK configuration we previously made:
+
+We modify the path inside the vpp.mk file:
+
+.. code-block:: console
+
+ $ build-data/platforms/vpp.mk
+ $ vpp_uses_external_dpdk = yes
+ $ vpp_dpdk_inc_dir = <PATH_TO_DESTDIR_NAME_FROM_ABOVE>/include/dpdk/
+ $ vpp_dpdk_lib_dir =<PATH_TO_DESTDIR_NAME_FROM_ABOVE>/lib
+
+<PATH_TO_DESTDIR_NAME_FROM_ABOVE> is whatever the path used when compiling DPDK above. These paths have to be absolute path in order for it to work.
+
+we modify build-data/platforms/vpp.mk to use
+
+.. code-block:: console
+
+ vpp_uses_dpdk_mlx4_pmd = yes
+
+.. code-block:: console
+
+ $ make build
+ $ cd build-root/
+ $ make V=0 PLATFORM=vpp TAG=vpp install-deb
+ $ sudo dpkg -i *.deb
+
+Finally, we modify the startup.conf file:
+
+.. code-block:: console
+
+ $ cd /etc/vpp
+ $ sudo nano startup.conf
+
+Inside the DPDK block, the following commands:
+
+.. code-block:: console
+
+
+ ## Whitelist specific interface by specifying PCI address
+ dev 000X:00:0X.0
+ dev 000X:00:0X.0
+ 
+ # Running failsafe
+ vdev net_vdev_netvsc0,iface=eth1
+ vdev net_vdev_netvsc1,iface=eth2
+
+*Please refer to Azure DPDK document to pick the right iface to use for failsafe vdev.*
+
+
+and finally:
+
+.. code-block:: console
+
+ $ sudo service vpp stop
+ $ sudo service vpp start
+ $ sudo service vpp status
+ $ sudo vppctl
+
+Now VPP will work inside Azure!
+
+
+
+
+
+
+
+