documentation for kubernetes data plane with dpdk acceration on Arm64 platform

Change-Id: Id32d9a49777280972dcb37b447ffc7e24a4aadfa
Signed-off-by: Bin Lu <bin.lu@arm.com>

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+.. This work is licensed under a Creative Commons Attribution 4.0 International
+.. License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) OPNFV, Arm Limited.
+
+
+
+=============================================================
+Kubernetes Pods with DPDK Acceration Deployment on Arm Server
+=============================================================
+
+Abstract
+========
+
+This document gives a brief introduction on how to deploy Pods with DPDK acceration for data plane.
+
+Introduction
+============
+.. _kubeadm: https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/
+.. _dpdk:    http://dpdk.org
+
+As we know, in some cases we need to deploy Pods with data-plane acceration.
+Typically, in production area(5G, Edge computing),
+one interface we used for control plane, it usually will be flannel.
+For data plane, sriov cni + DPDK has the best throughput and the lowest lantency.
+In this case, I will introduce Pod with DPDK acceration firstly.
+
+NIC with SR-IOV capabilities works by introducing the idea of physical functions (PFs)
+and virtual functions (VFs).
+In general, PF is used by host.
+Each VFs can be treated as a separate physical NIC and assigned to one container,
+and configured with separate MAC, VLAN and IP, etc.
+If we want the best networking performance for Pods, this should be the best solution.
+
+DPDK is a set of libraries and drivers for fast packet processing.
+It is designed to run on any processors.
+DPDK can greatly boosts packet processing performance and throughput,
+allowing more time for data plane applications.
+Also it can improve packet processing performance by up to ten times.
+
+For demo purpose, I suggest that we use Kubeadm to deploy a Kubernetes cluster firstly.
+Then I will give out a typical deployment scenario.
+
+Basic Information about Environment
+===================================
+
+Cluster Info
+
+In this case, we deploy master and slave as one node.
+Suppose it to be: 192.168.1.2
+
+In 192.168.1.2, 2 NIC as required.
+Suppose it to be: eth0, eth1, eth0 is used to be controle plane, and eth1 is used to be data plane.
+Also eth1 should support SRIOV.
+
+Deploy Kubernetes
+-----------------
+Please see link(https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/) as reference.
+
+SRIOV Configuration
+-------------------
+Please make sure SRIOV VF mode was enabled in your host.
+
+::
+ For example
+   rmmod ixgb
+   modprobe ixgbe max_vfs=8
+
+VFIO and IOMMU Configuration
+----------------------------
+Please make sure the required pcie devices were binded into vfio-pci.
+And IOMMU was optional on Arm64 platform
+
+
+::
+  With driverctl:
+
+  # driverctl -v list-devices | grep -i net
+  # driverctl set-override <pci-slot> vfio-pci
+
+  With dpdk_nic_bind (DPDK <= 16.04):
+
+  # modprobe vfio-pci
+  # dpdk_nic_bind --status
+  # dpdk_nic_bind --bind=vfio-pci <pci-slot>
+
+  With dpdk-devbind (DPDK >= 16.07:
+
+  # modprobe vfio-pci
+  # dpdk-devbind --status
+  # dpdk-devbind --bind=vfio-pci <pci-slot>
+
+::
+  Enable IOMMU
+
+  # IOMMU was enabled as default on Arm64 platform
+
+  Disable IOMMU
+
+  # echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
+
+Hugepage Configuration
+----------------------
+Please make sure hugepage was enabled in your host.
+
+::
+  For example:
+  mount -t hugetlbfs nodev /mnt/huge
+  echo 4096 > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages
+
+Configuring Pod with Control Plane and Data Plane with DPDK Acceration
+======================================================================
+
+1, Save the below following YAML to dpdk.yaml.
+
+::
+ apiVersion: v1
+ kind: Pod
+ metadata:
+   name: dpdk
+ spec:
+   nodeSelector:
+     beta.kubernetes.io/arch: arm64
+   containers:
+   - name: dpdk
+     image: younglook/dpdk:arm64
+     command: [ "bash", "-c", "/usr/bin/l2fwd --huge-unlink -l 6-7 -n 4 --file-prefix=container -- -p 3" ]
+     stdin: true
+     tty: true
+     securityContext:
+       privileged: true
+     volumeMounts:
+     - mountPath: /dev/vfio
+       name: vfio
+     - mountPath: /mnt/huge
+       name: huge
+   volumes:
+   - name: vfio
+     hostPath:
+       path: /dev/vfio
+   - name: huge
+     hostPath:
+       path: /mnt/huge
+
+2, Create Pod
+
+::
+ command:
+  kubectl create -f dpdk.yaml
+
+3, Get the details of the running pod from the master
+
+::
+ # kubectl get pods
+ NAME                   READY     STATUS    RESTARTS   AGE
+ dpdk                   1/1       Running   0          30s
+
+Verifying DPDK Demo Application
+===============================
+
+::
+ # kubectl logs dpdk
+ Port statistics ====================================
+ Statistics for port 0 ------------------------------
+ Packets sent:                     7743
+ Packets received:            675351868
+ Packets dropped:             675229528
+ Statistics for port 1 ------------------------------
+ Packets sent:                     6207
+ Packets received:            675240108
+ Packets dropped:             675345661
+ Aggregate statistics ===============================
+ Total packets sent:              13950
+ Total packets received:     1350594777
+ Total packets dropped:      1350577990
+ ====================================================
+
+Contacts
+========
+
+Bin Lu:      bin.lu@arm.com