Adding ethtool info to Ansible interface facts (#16513)

This will give the user details on how the interfaces are configured.
They user could query to see if TSO, GSO, etc are enbaled
on an interface.

lib/ansible/module_utils/facts.py

@@ -2277,6 +2277,25 @@ class LinuxNetwork(Network):
             parse_ip_output(primary_data)
             parse_ip_output(secondary_data, secondary=True)
 
+            def parse_ethtool_output(device,output):
+                interfaces[device]['features'] = {}
+                for line in output.strip().split('\n'):
+                    if not line:
+                        continue
+                    if line.endswith(":") :
+                        continue
+                    key,value = line.split(": ")
+                    if not value :
+                        continue
+                    interfaces[device]['features'][key.strip().replace('-','_')] = value.strip()
+
+            ethtool_path = self.module.get_bin_path("ethtool")
+            if ethtool_path:
+                args = [ethtool_path, '-k', device]
+                rc, stdout, stderr = self.module.run_command(args)
+                ethtool_data = stdout
+                parse_ethtool_output(device,ethtool_data)
+
         # replace : by _ in interface name since they are hard to use in template
         new_interfaces = {}
         for i in interfaces: