T6917: fix RPS ethernet settings for CPUs with more than 32 cores

The maximun value theat could be written for the 'rpc_cpu'
is 4294967295 or 0xffffffff

Ensure that the bitmask size doesn't exceed 32 bits, even if
the system has more CPUs.

python/vyos/ifconfig/ethernet.py

@@ -310,13 +310,19 @@ def set_rps(self, state):
         rps_cpus = 0
         queues = len(glob(f'/sys/class/net/{self.ifname}/queues/rx-*'))
         if state:
+            # Maximum integer value that could be written for the 'rps_cpu'
+            # is 4294967295 or 0xffffffff
+            # Ensure that the bitmask size doesn't exceed 32 bits, even if
+            # the system has more CPUs.
+            max_supported_cpus = 32
+
             # Enable RPS on all available CPUs except CPU0 which we will not
             # utilize so the system has one spare core when it's under high
             # preasure to server other means. Linux sysfs excepts a bitmask
             # representation of the CPUs which should participate on RPS, we
             # can enable more CPUs that are physically present on the system,
             # Linux will clip that internally!
-            rps_cpus = (1 << os.cpu_count()) -1
+            rps_cpus = (1 << min(os.cpu_count(), max_supported_cpus)) - 1
 
             # XXX: we should probably reserve one core when the system is under
             # high preasure so we can still have a core left for housekeeping.