tests/platforms: add test for Azure SR-IOV udev rules

Introduce a new test which verifies that udev rules for Azure SR-IOV
network interfaces correctly mark them as unmanaged by NetworkManager.
It only runs on Azure and uses Standard_D2s_v3 or larger instance type
with Accelerated Networking enabled.

The test checks that SR-IOV interfaces (PCI devices with vendor drivers
like mlx5_core) have the AZURE_UNMANAGED_SRIOV property set, and that
NetworkManager respects this property by leaving them unmanaged.

Author: aaradhak

tests/kola/platforms/azure/sriov/data/commonlib.sh

@@ -0,0 +1 @@
+../../../../data/commonlib.sh

tests/kola/platforms/azure/sriov/test.sh

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+#!/bin/bash
+## kola:
+##   # This test is targeted at Azure
+##   platforms: azure
+##   # This test requires an instance type that supports Accelerated Networking (SRIOV)
+##   # Standard_D2s_v3 and larger sizes support Accelerated Networking
+##   instanceType: "Standard_D2s_v3"
+##   description: Verify that udev rules for Azure SRIOV network interfaces
+##                correctly mark them as unmanaged by NetworkManager.
+
+set -xeuo pipefail
+
+. "$KOLA_EXT_DATA/commonlib.sh"
+
+# Find SRIOV network interfaces
+# Azure SR-IOV interfaces use vendor drivers like mlx5_core
+sriov_interfaces=()
+for iface in /sys/class/net/*; do
+    iface_name=$(basename "$iface")
+    # Skip loopback
+    if [ "$iface_name" = "lo" ]; then
+        continue
+    fi
+
+    if [ -e "$iface/device/driver" ]; then
+        driver=$(basename "$(readlink "$iface/device/driver")")
+        # SR-IOV interfaces are on PCI bus and not vmbus (hv_netvsc is the synthetic interface)
+        if [ "$driver" != "hv_netvsc" ] && [ -e "$iface/device/subsystem" ]; then
+            subsystem=$(basename "$(readlink "$iface/device/subsystem")")
+            if [ "$subsystem" = "pci" ]; then
+                sriov_interfaces+=("$iface_name")
+            fi
+        fi
+    fi
+done
+
+# If no SRIOV interfaces found then this might be a VM size without Accelerated Networking
+# or the feature might not be enabled. We should have at least one SRIOV interface.
+if [ ${#sriov_interfaces[@]} -eq 0 ]; then
+    fatal "No SRIOV interfaces found, expected at least one PCI network interface (non-hv_netvsc)."
+fi
+
+# Check that each SRIOV interface has the AZURE_UNMANAGED_SRIOV property set
+# This property is set by the azure-vm-utils udev rules
+for iface in "${sriov_interfaces[@]}"; do
+    # Check the interface properties
+    if ! udevadm info --query=property --path="/sys/class/net/$iface" | grep -q "AZURE_UNMANAGED_SRIOV=1"; then
+        fatal "SRIOV interface $iface does not have AZURE_UNMANAGED_SRIOV=1 property."
+    fi
+done
+
+# Verify that NetworkManager is not managing these interfaces
+echo "Verifying NetworkManager is not managing SRIOV interfaces..."
+nm_devices=$(nmcli -t -f DEVICE,STATE device)
+
+for iface in "${sriov_interfaces[@]}"; do
+    # Check NetworkManager's device list from cached output
+    if echo "$nm_devices" | grep -q "^$iface:"; then
+        # If the interface appears in nmcli output, check its state
+        state=$(echo "$nm_devices" | grep "^$iface:" | cut -d: -f2)
+        if [ "$state" != "unmanaged" ]; then
+            fatal "NetworkManager is managing SRIOV interface $iface (state: $state). It should be unmanaged."
+        fi
+    fi
+
+    echo "✓ NetworkManager correctly ignores $iface"
+done