Add XDP Interop Test (#5089)

Author: nibanks

.github/workflows/test.yml

@@ -264,6 +264,7 @@ jobs:
           { config: "Release", plat: "linux", os: "ubuntu-22.04", arch: "x64", tls: "quictls", build: "-Test" },
           { config: "Release", plat: "linux", os: "ubuntu-24.04", arch: "x64", tls: "quictls", build: "-Test" },
           { config: "Release", plat: "windows", os: "windows-2022", arch: "x64", tls: "schannel", build: "-Test" },
+          { config: "Release", plat: "windows", os: "windows-2022", arch: "x64", tls: "schannel", build: "-Test", xdp: "-UseXdp" },
           { config: "Release", plat: "windows", os: "windows-2025", arch: "x64", tls: "schannel", build: "-Test" },
           { config: "Release", plat: "windows", os: "WinServerPrerelease", arch: "x64", tls: "schannel", build: "-Test" },
         ]

src/tools/interop/interop.cpp

@@ -739,6 +739,8 @@ RunInteropTest(
     Settings.IsSet.SendBufferingEnabled = TRUE;
     Settings.IdleTimeoutMs = WaitTimeoutMs;
     Settings.IsSet.IdleTimeoutMs = TRUE;
+    Settings.XdpEnabled = TRUE;
+    Settings.IsSet.XdpEnabled = TRUE;
     if (Feature == KeyUpdate) {
         Settings.MaxBytesPerKey = 10; // Force a key update after every 10 bytes sent
         Settings.IsSet.MaxBytesPerKey = TRUE;