AF_XDP example

Signed-off-by: Artem Glazychev <artem.glazychev@xored.com>

examples/afxdp/README.md

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+# AF_XDP forwarder-vpp management interface
+
+Contains a setup for NSM that includes `nsmgr`, `forwarder-vpp`, `registry-k8s`, `admission-webhook`.
+\
+Unlike the [basic setup](../basic), which uses `AF_PACKET` management interface by default, we set `AF_XDP` here.
+
+_**Note:** this is experimental feature. It may not work on some clusters._
+
+The diagram below shows the movement of traffic within the forwarder-vpp:
+
+![NSM kernel2kernel Diagram](./diagram.svg "NSM Kernel2Kernel Scheme")
+
+Packets arriving at the network interface are processed by the eBPF program, which decides how to redirect the traffic.
+If the packet belongs to the NSM interface it forwards it to the VPP, otherwise it goes to the Linux network stack.
+## Requires
+
+- [spire](../spire/single_cluster)
+
+## Includes
+
+- [Memif to Memif Connection](../use-cases/Memif2Memif)
+- [Kernel to Kernel Connection](../use-cases/Kernel2Kernel)
+- [Kernel to Memif Connection](../use-cases/Kernel2Memif)
+- [Memif to Kernel Connection](../use-cases/Memif2Kernel)
+- [Kernel to Ethernet to Kernel Connection](../use-cases/Kernel2Ethernet2Kernel)
+- [Memif to Ethernet to Memif Connection](../use-cases/Memif2Ethernet2Memif)
+- [Kernel to Ethernet to Memif Connection](../use-cases/Kernel2Ethernet2Memif)
+- [Memif to Ethernet to Kernel Connection](../use-cases/Memif2Ethernet2Kernel)
+- [Kernel to IP to Kernel Connection](../use-cases/Kernel2IP2Kernel)
+- [Memif to IP to Memif Connection](../use-cases/Memif2IP2Memif)
+- [Kernel to IP to Memif Connection](../use-cases/Kernel2IP2Memif)
+- [Memif to IP to Kernel Connection](../use-cases/Memif2IP2Kernel)
+- [Simple OPA example](../features/opa)
+- [Kernel2Kernel IPv6 example](../features/ipv6/Kernel2Kernel_ipv6)
+- [Memif2Memif IPv6 example](../features/ipv6/Memif2Memif_ipv6)
+- [Kernel2Wireguard2Kernel IPv6 example](../features/ipv6/Kernel2Wireguard2Kernel_ipv6)
+- [Kernel2Wireguard2Memif IPv6 example](../features/ipv6/Kernel2Wireguard2Memif_ipv6)
+- [Memif2Wireguard2Kernel IPv6 example](../features/ipv6/Memif2Wireguard2Kernel_ipv6)
+- [Memif2Wireguard2Memif IPv6 example](../features/ipv6/Memif2Wireguard2Memif_ipv6)
+- [Kernel2Kernel dual stack example](../features/dual-stack/Kernel2Kernel_dual_stack)
+- [Kernel2Wireguard2Kernel dual stack example](../features/dual-stack/Kernel2Wireguard2Kernel_dual_stack)
+- [Admission webhook](../features/webhook)
+- [DNS](../features/dns)
+- [Topology aware scale from zero](../features/scale-from-zero)
+- [NSE composition](../features/nse-composition)
+- [Exclude prefixes](../features/exclude-prefixes)
+- [Exclude prefixes client](../features/exclude-prefixes-client)
+- [Policy based routing](../features/policy-based-routing)
+- [Mutually aware NSEs](../features/mutually-aware-nses)
+- [vL3-basic](../features/vl3-basic)
+- [vL3 DNS](../features/vl3-dns)
+- [vL3-scale-from-zero](../features/vl3-scale-from-zero)
+- [Inject clients in namespace via NSM annotation](../features/annotated-namespace)
+
+## Run
+
+Apply NSM resources for basic tests:
+
+```bash
+kubectl apply -k https://github.com/networkservicemesh/deployments-k8s/examples/afxdp?ref=335c3ef067cf7a8921a98d0cab3ef7e4220f3bcd
+```
+
+Wait for admission-webhook-k8s:
+
+```bash
+WH=$(kubectl get pods -l app=admission-webhook-k8s -n nsm-system --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
+kubectl wait --for=condition=ready --timeout=1m pod ${WH} -n nsm-system
+```
+
+## Cleanup
+
+To free resources follow the next commands:
+
+```bash
+WH=$(kubectl get pods -l app=admission-webhook-k8s -n nsm-system --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
+kubectl delete mutatingwebhookconfiguration ${WH}
+kubectl delete ns nsm-system
+```

examples/afxdp/forwarder-vpp.yaml

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+---
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: forwarder-vpp
+spec:
+  template:
+    spec:
+      containers:
+        - name: forwarder-vpp
+          env:
+            - name: NSM_VPP_INIT
+              value: AF_XDP

examples/afxdp/kustomization.yaml

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+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: nsm-system
+
+resources:
+- nsm-system-namespace.yaml
+- ../../apps/nsmgr
+- ../../apps/forwarder-vpp
+- ../../apps/registry-k8s
+- ../../apps/admission-webhook-k8s
+
+patchesStrategicMerge:
+- forwarder-vpp.yaml

examples/afxdp/nsm-system-namespace.yaml

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+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: nsm-system