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Update documentation on xdp_tests #1403

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Sep 20, 2022
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Update documentation on xdp_tests #1403

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doc changes.
shankarseal Sep 19, 2022
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shankarseal Sep 20, 2022
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shankarseal Sep 20, 2022
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Merge branch 'main' into fix_xdp_test_documentation
dthaler Sep 20, 2022
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41 changes: 34 additions & 7 deletions docs/GettingStarted.md
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Expand Up @@ -252,12 +252,39 @@ Other useful options include:
4. `Test_name` to run a single test

### xdp_tests.exe
This application tests various XDP functionalities. It has the following tests:
1. Reflection Test: This tests the XDP_TX functionality. The following steps show how to run the test:
1. On the system under test, install eBPF binaries (`.\scripts\setup-ebpf.ps1`).
2. Load the test eBPF program by running the following commands: `netsh`, `ebpf`, `add program reflect_packet.o xdp` and note the ID.
3. From a remote host, run xdp_tests.exe and in `--remote-ip` parameter pass an IPv4 or IPv6 address of an Ethernet-like interface on the system under test in string format.
4. Unload the program from system under test by running `delete program <id>` on the netsh prompt, where <id> is the ID noted above.
This application tests various XDP functionalities. These tests require two hosts to run. There are three variations of the XDP tests.

#### Reflection Test
This tests the XDP_TX functionality.
1. On the first host:
1. [Install eBPF for Windows](https://github.com/microsoft/ebpf-for-windows/blob/main/docs/InstallEbpf.md).
2. Load the test eBPF program by running the following command: `netsh ebpf add program reflect_packet.o xdp` and note the ID.
2. On the second host:
1. Allow inbound traffic for `xdp_tests.exe` through Windows Defender Firewall. See **Note 1** below.
2. Run `xdp_tests.exe xdp_reflect_test --remote_ip <IP on the first host>`. See **Note 2** below.

#### Encapsulation Test
This uses `bpf_xdp_adjust_head` helper function to encapsulate an outer IP header to a packet.
1. On the first host:
1. [Install eBPF for Windows](https://github.com/microsoft/ebpf-for-windows/blob/main/docs/InstallEbpf.md).
2. Load the test eBPF program by running the following command: `netsh ebpf add program encap_reflect_packet.o xdp` and note the ID.
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2. On the second host:
1. Allow inbound traffic for `xdp_tests.exe` through Windows Defender Firewall. See **Note 1** below.
2. Run `xdp_tests.exe xdp_encap_reflect_test --remote_ip <IP on the first host>`. See **Note 2** below.

#### Decapsulation Test
This uses `bpf_xdp_adjust_head` helper function to decapsulate an outer IP header from a packet.
1. On *both* the test machines, [install eBPF for Windows](https://github.com/microsoft/ebpf-for-windows/blob/main/docs/InstallEbpf.md).
2. On the first host load the first test eBPF program by running the following command: `netsh ebpf add program encap_reflect_packet.o xdp` and note the ID.
3. On the second host:
1. Load the second test eBPF program by running the following command: `netsh ebpf add program decap_permit_packet.o xdp` and note the ID.
2. Allow inbound traffic for `xdp_tests.exe` through Windows Defender Firewall. See **Note 1** below.
3. Run `xdp_tests.exe xdp_reflect_test --remote_ip <IP on the first host>`. See **Note 2** below.

**Note 1:** To allow inbound traffic to `xdp_tests.exe`, in a Windows Powershell with administrative privilege, run `New-NetFirewallRule -DisplayName "XDP_Test" -Program "<Full path to xdp_tests.exe>" -Direction Inbound -Action Allow`.<br>
**Note 2:** For the `--remote-ip` parameter to `xdp_tests.exe` program that is run on the second host, pass an IPv4 or IPv6 address of an Ethernet-like interface on the first host in string format.<br>
**Note 3:** After completion of each test variation, unload the eBPF programs from both host machines by running `delete program <id>` on the netsh prompt, where `<id>` is the ID noted when the eBPF programs were loaded.<br>
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***Advanced:*** The eBPF program can be attached to a specific interface by passing `interface=<IfIndex>` parameter either to the netsh `add program` or `set program` commands.

### socket_tests.exe
This application loads the `cgroup_sock_addr.o` eBPF program and attaches to hooks to handle various socket operations. Currently it tests authorizing ingress and egress connections based on entries in a map passed to the program.
Expand All @@ -275,7 +302,7 @@ To capture a trace in a file use the following commands:

### Viewing traces in real-time
To view traces in real-time, the `tracelog.exe` and `tracefmt.exe` commands from the WDK can be used.
If you are running eBPF for Windows in a VM, you can either install the full WDK in the VM (see the Prequisites
If you are running eBPF for Windows in a VM, you can either install the full WDK in the VM (see the Pre-requisites
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section above) or just copy the two executables into the VM.

To view all eBPF trace events that would be captured to a file, use the following commands:
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