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+# VDPA
+
+Virtual data path acceleration (vDPA) in essence is an approach to standardize 
+the NIC SRIOV data plane using the virtio ring layout and placing a single standard 
+virtio driver in the guest/pod. It’s decoupled from any vendor implementation while 
+adding a generic control plane and SW infrastructure to support it. Given that it’s 
+an abstraction layer on top of SRIOV (Single Root I/O Virtualization) it is also 
+future proof to support emerging technologies such as scalable IOV.
+
+Main aspects of this solution:
+- primary interface in the pod is configured as a virtio/vDPA device
+- OVS HW offload enabled
+- NIC configured in switchdev mode
+- OVN-kubernetes CNI
+
+## Supported Ethernet controllers
+
+The following manufacturers/NICs are known to work:
+
+- Mellanox ConnectX-6 Dx
+
+## Prerequisites
+
+- OpenVswitch installed
+- Network Manager installed
+
+### Deploy SriovNetworkNodePolicy
+
+```yaml
+apiVersion: sriovnetwork.openshift.io/v1
+kind: SriovNetworkNodePolicy
+metadata:
+  name: vdpa-policy
+  namespace: openshift-sriov-network-operator
+spec:
+  nodeSelector:
+    feature.node.kubernetes.io/network-sriov.capable: "true"
+  resourceName: mlxnics
+  priority: 10
+  numVfs: 2
+  nicSelector:
+    vendor: "15b3"
+    deviceID: "101d"
+    rootDevices:
+    - 0000:65:00.0
+    - 0000:65:00.1
+  deviceType: netdevice
+  eSwitchMode: switchdev
+  vdpaType: virtio
+```
+
+### Create NetworkAttachementDefinition CRD with OVN-K CNI config
+
+```yaml
+apiVersion: "k8s.cni.cncf.io/v1"
+kind: NetworkAttachmentDefinition
+metadata:
+  name: ovn-kubernetes-a
+  namespace: kube-system
+  annotations:
+    k8s.v1.cni.cncf.io/resourceName: openshift.io/mlxnics
+spec:
+  config: '{
+      "cniVersion": "0.3.1",
+      "name":"ovn-kubernetes-a",
+      "type": "ovn-k8s-cni-overlay",
+      "ipam": {},
+      "dns": {}
+    }'
+```
+
+### Deploy POD with virtio/vDPA
+
+Create POD spec and request a VF
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: vdpa-pod1
+  namespace: vdpa
+  annotations:
+    v1.multus-cni.io/default-network: kube-system/ovn-kubernetes-a
+spec:
+  containers:
+  - name: vdpa-pod
+    image: networkstatic/iperf3
+    imagePullPolicy: IfNotPresent
+    securityContext:
+      privileged: true
+    command:
+      - sleep
+      - "3600"
+```
+
+## Verify vDPA is Working
+
+Run ethtool to verify the correctness of the virtio/vDPA interface in the pod:
+
+```bash
+kubectl exec -it vdpa-pod1 -- ethtool -i eth0
+```
+
+```text
+driver: virtio_net
+version: 1.0.0
+firmware-version: 
+expansion-rom-version: 
+bus-info: vdpa:0000:65:00.4
+supports-statistics: yes
+supports-test: no
+supports-eeprom-access: no
+supports-register-dump: no
+supports-priv-flags: no
+```
+
+Check connectivity between the pods:
+
+```bash
+kubectl exec -it vdpa-pod1 -- ping <other-pod-ip-address>
+```
+
+Check datapath rules are offloaded
+
+```text
+ovs-appctl dpctl/dump-flows -m type=offloaded
+ufid:30ae9875-d107-46a1-b8cb-cdaafd89d440, skb_priority(0/0),skb_mark(0/0),ct_state(0/0),ct_zone(0/0),ct_mark(0/0),ct_label(0/0),recirc_id(0),dp_hash(0/0),in_port(ac63a8e99747603),packet_type(ns=0/0,id=0/0),eth(src=0a:58:c0:a8:00:06,dst=0a:58:c0:a8:00:05),eth_type(0x0800),ipv4(src=192.168.0.6,dst=192.168.0.5,proto=6,tos=0/0,ttl=0/0,frag=no),tcp(src=0/0,dst=57426), packets:7, bytes:396, used:2.310s, offloaded:yes, dp:tc, actions:ct(zone=15,nat),recirc(0x440)
+ufid:b895ff1d-4085-4199-8b49-0b6fc9e54a29, skb_priority(0/0),skb_mark(0/0),ct_state(0/0),ct_zone(0/0),ct_mark(0/0),ct_label(0/0),recirc_id(0),dp_hash(0/0),in_port(ac63a8e99747603),packet_type(ns=0/0,id=0/0),eth(src=0a:58:c0:a8:00:06,dst=0a:58:c0:a8:00:05),eth_type(0x0800),ipv4(src=192.168.0.6,dst=192.168.0.5,proto=6,tos=0/0,ttl=0/0,frag=no),tcp(src=0/0,dst=57428), packets:46244, bytes:3052518, used:0.260s, offloaded:yes, dp:tc, actions:ct(zone=15,nat),recirc(0x442)
+ufid:ea3e4350-70ac-46aa-8fba-fff5ee54dc32, skb_priority(0/0),skb_mark(0/0),ct_state(0/0),ct_zone(0/0),ct_mark(0/0),ct_label(0/0),recirc_id(0),dp_hash(0/0),in_port(ac63a8e99747603),packet_type(ns=0/0,id=0/0),eth(src=0a:58:c0:a8:00:06,dst=00:00:00:00:00:00/00:00:00:00:00:00),eth_type(0x86dd),ipv6(src=::/::,dst=::/::,label=0/0,proto=0/0,tclass=0/0,hlimit=0/0,frag=no), packets:0, bytes:0, used:6.270s, offloaded:yes, dp:tc, actions:drop
+ufid:a23365ae-26cd-4bbb-85b5-4299c05a350d, skb_priority(0/0),skb_mark(0/0),ct_state(0/0),ct_zone(0/0),ct_mark(0/0),ct_label(0/0),recirc_id(0),dp_hash(0/0),in_port(8630f7a90005cdd),packet_type(ns=0/0,id=0/0),eth(src=0a:58:c0:a8:00:05,dst=0a:58:c0:a8:00:06),eth_type(0x0800),ipv4(src=192.168.0.5,dst=192.168.0.6,proto=6,tos=0/0,ttl=0/0,frag=no),tcp(src=0/0,dst=5201), packets:2156610, bytes:3049431372, used:0.260s, offloaded:yes, dp:tc, actions:ct(zone=14,nat),recirc(0x43e)
+```