verify_timesync_ptp - support multiple ptp devices.

In some Linux VMs you may see multiple PTP devices listed.
One example is for Accelerated Networking the Mellanox mlx5 driver also creates a /dev/ptp device.
Because the initialization order can be different each time Linux boots,the PTP device corresponding to the Azure host might be /dev/ptp0 or it might be /dev/ptp1.
To determine which PTP device corresponds to the Azure host, you can check the clock_name file.
Atleast one of the PTP devices should have a clock_name of 'hyperv'.

microsoft/testsuites/core/timesync.py

@@ -20,7 +20,7 @@
  create_timer,
 )
 from lisa.operating_system import CpuArchitecture, Redhat, Suse
-from lisa.tools import Cat, Chrony, Dmesg, Hwclock, Lscpu, Ntp, Ntpstat, Service
+from lisa.tools import Cat, Chrony, Dmesg, Hwclock, Ls, Lscpu, Ntp, Ntpstat, Service
 from lisa.tools.date import Date
 from lisa.tools.lscpu import CpuType
 from lisa.util import constants
@@ -94,14 +94,28 @@ def verify_timesync_ptp(self, node: Node) -> None:
  assert_that(dmesg.get_output()).contains(self.ptp_registered_msg)
 
  # 2. PTP device name is hyperv.
+ # In some Linux VMs you may see multiple PTP devices listed.
+ # One example is for Accelerated Networking the Mellanox mlx5 driver also
+ # creates a /dev/ptp device. Because the initialization order can be different
+ # each time Linux boots, the PTP device corresponding to the Azure host might
+ # be /dev/ptp0 or it might be /dev/ptp1.
+ # To determine which PTP device corresponds to the Azure host, you can check the
+ # clock_name file. At least one of the PTP devices should have
+ # a clock_name of 'hyperv'.
  cat = node.tools[Cat]
- clock_name_result = cat.run("/sys/class/ptp/ptp0/clock_name")
- assert_that(clock_name_result.stdout).described_as(
- f"ptp clock name should be 'hyperv', meaning the Azure host, "
- f"but it is {clock_name_result.stdout}, more info please refer "
- f"https://docs.microsoft.com/en-us/azure/virtual-machines/linux/time-sync#check-for-ptp-clock-source" # noqa: E501
- ).is_equal_to("hyperv")
-
+ ls = node.tools[Ls]
+ ptp_devices = ls.list_dir("/sys/class/ptp")
+ ptp_hyperv_device = None
+ for ptp_device in ptp_devices:
+ clock_name_result = cat.run(
+ f"{ptp_device}clock_name", sudo=True, shell=True, force_run=True
+ )
+ if clock_name_result.stdout == "hyperv":
+ ptp_hyperv_device = ptp_device
+ assert_that(ptp_hyperv_device).described_as(
+ "There should be at least one PTP device with name 'hyperv', more info"
+ " please refer https://docs.microsoft.com/en-us/azure/virtual-machines/linux/time-sync#check-for-ptp-clock-source" # noqa: E501
+ ).is_not_none()
  # 3. When accelerated network is enabled, multiple PTP devices will
  # be available, the names of ptp are changeable, create the symlink
  # /dev/ptp_hyperv to whichever /dev/ptp entry corresponds to the Azure host.