ethernet: T5566: disable energy efficient ethernet (EEE) for interfaces

VyOS is a routing (packet pushing) platform, thus supporting EEE which
potentially causes issues is not a good idea. Some recent Intel drivers enable
EEE by default, thus we will disable this for every NIC supporting EEE.

(cherry picked from commit ab30509)

python/vyos/ethtool.py

@@ -23,6 +23,7 @@
 _drivers_without_speed_duplex_flow = ['vmxnet3', 'virtio_net', 'xen_netfront',
                                       'iavf', 'ice', 'i40e', 'hv_netvsc', 'veth', 'ixgbevf',
                                       'tun']
+_drivers_without_eee = ['vmxnet3', 'virtio_net', 'xen_netfront', 'hv_netvsc']
 
 class Ethtool:
     """
@@ -55,16 +56,18 @@ class Ethtool:
     _auto_negotiation_supported = None
     _flow_control = False
     _flow_control_enabled = None
+    _eee = False
+    _eee_enabled = None
 
     def __init__(self, ifname):
         # Get driver used for interface
-        out, err = popen(f'ethtool --driver {ifname}')
+        out, _ = popen(f'ethtool --driver {ifname}')
         driver = re.search(r'driver:\s(\w+)', out)
         if driver:
             self._driver_name = driver.group(1)
 
         # Build a dictinary of supported link-speed and dupley settings.
-        out, err = popen(f'ethtool {ifname}')
+        out, _ = popen(f'ethtool {ifname}')
         reading = False
         pattern = re.compile(r'\d+base.*')
         for line in out.splitlines()[1:]:
@@ -95,7 +98,7 @@ def __init__(self, ifname):
                 self._auto_negotiation = bool(tmp == 'on')
 
         # Now populate features dictionaty
-        out, err = popen(f'ethtool --show-features {ifname}')
+        out, _ = popen(f'ethtool --show-features {ifname}')
         # skip the first line, it only says: "Features for eth0":
         for line in out.splitlines()[1:]:
             if ":" in line:
@@ -108,7 +111,7 @@ def __init__(self, ifname):
                     'fixed' : fixed
                 }
 
-        out, err = popen(f'ethtool --show-ring {ifname}')
+        out, _ = popen(f'ethtool --show-ring {ifname}')
         # We are only interested in line 2-5 which contains the device maximum
         # ringbuffers
         for line in out.splitlines()[2:6]:
@@ -133,13 +136,22 @@ def __init__(self, ifname):
 
         # Get current flow control settings, but this is not supported by
         # all NICs (e.g. vmxnet3 does not support is)
-        out, err = popen(f'ethtool --show-pause {ifname}')
+        out, _ = popen(f'ethtool --show-pause {ifname}')
         if len(out.splitlines()) > 1:
             self._flow_control = True
             # read current flow control setting, this returns:
             # ['Autonegotiate:', 'on']
             self._flow_control_enabled = out.splitlines()[1].split()[-1]
 
+        # Get current Energy Efficient Ethernet (EEE) settings, but this is
+        # not supported by all NICs (e.g. vmxnet3 does not support is)
+        out, _ = popen(f'ethtool --show-eee {ifname}')
+        if len(out.splitlines()) > 1:
+            self._eee = True
+            # read current EEE setting, this returns:
+            # EEE status: disabled || EEE status: enabled - inactive || EEE status: enabled - active
+            self._eee_enabled = bool('enabled' in out.splitlines()[2])
+
     def check_auto_negotiation_supported(self):
         """ Check if the NIC supports changing auto-negotiation """
         return self._auto_negotiation_supported
@@ -227,3 +239,15 @@ def get_flow_control(self):
             raise ValueError('Interface does not support changing '\
                              'flow-control settings!')
         return self._flow_control_enabled
+
+    def check_eee(self):
+        """ Check if the NIC supports eee """
+        if self.get_driver_name() in _drivers_without_eee:
+            return False
+        return self._eee
+
+    def get_eee(self):
+        if self._eee_enabled == None:
+            raise ValueError('Interface does not support changing '\
+                             'EEE settings!')
+        return self._eee_enabled

python/vyos/ifconfig/ethernet.py

@@ -399,6 +399,34 @@ def set_ring_buffer(self, rx_tx, size):
             print(f'could not set "{rx_tx}" ring-buffer for {ifname}')
         return output
 
+    def set_eee(self, enable):
+        """
+        Enable/Disable Energy Efficient Ethernet (EEE) settings
+
+        Example:
+        >>> from vyos.ifconfig import EthernetIf
+        >>> i = EthernetIf('eth0')
+        >>> i.set_eee(enable=False)
+        """
+        if not isinstance(enable, bool):
+            raise ValueError('Value out of range')
+
+        if not self.ethtool.check_eee():
+            self._debug_msg(f'NIC driver does not support changing EEE settings!')
+            return False
+
+        current = self.ethtool.get_eee()
+        if current != enable:
+            # Assemble command executed on system. Unfortunately there is no way
+            # to change this setting via sysfs
+            cmd = f'ethtool --set-eee {self.ifname} eee '
+            cmd += 'on' if enable else 'off'
+            output, code = self._popen(cmd)
+            if code:
+                Warning(f'could not change "{self.ifname}" EEE setting!')
+            return output
+        return None
+
     def update(self, config):
         """ General helper function which works on a dictionary retrived by
         get_config_dict(). It's main intention is to consolidate the scattered
@@ -409,6 +437,9 @@ def update(self, config):
         value = 'off' if 'disable_flow_control' in config else 'on'
         self.set_flow_control(value)
 
+        # Always disable Energy Efficient Ethernet
+        self.set_eee(False)
+
         # GRO (generic receive offload)
         self.set_gro(dict_search('offload.gro', config) != None)