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How to use _set_loopback method in autotest

Best Python code snippet using autotest_python

net_utils.py

...187        return result == 'on'188    def is_rx_pause_on(self):189        result = self.parse_ethtool('RX', 'on|off', '-a')190        return result == 'on'191    def _set_loopback(self, mode, enable_disable):192        return bin_utils.system('%s -L %s %s %s' %193                      (self.ethtool, self._name, mode, enable_disable),194                      ignore_status=True)195    def enable_loopback(self):196        # If bonded do not set loopback mode.197        # Try mac loopback first then phy loopback198        # If both fail, raise an error199        if bond().is_enabled():200            raise error.TestError('Unable to enable loopback while '201                                  'bonding is enabled.')202        if (self._set_loopback('phyint', 'enable') > 0 and203            self._set_loopback('mac', 'enable') > 0):204            raise error.TestError('Unable to enable loopback')205        # Add a 1 second wait for drivers which do not have206        # a synchronous loopback enable207        # TODO (msb); Remove this wait once the drivers are fixed208        if self.get_driver() in ['tg3', 'bnx2x']:209            time.sleep(1)210        self.wait_for_carrier(timeout=30)211    def disable_loopback(self):212        # Try mac loopback first then phy loopback213        # If both fail, raise an error214        if (self._set_loopback('phyint', 'disable') > 0 and215            self._set_loopback('mac', 'disable') > 0):216            raise error.TestError('Unable to disable loopback')217    def is_loopback_enabled(self):218        # Don't try ethtool -l on a bonded host219        if bond().is_enabled():220            return False221        output = bin_utils.system_output('%s -l %s'222                                         % (self.ethtool, self._name))223        if output:224            return 'enabled' in output225        return False226    def enable_promisc(self):227        bin_utils.system('ifconfig %s promisc' % self._name)228    def disable_promisc(self):229        bin_utils.system('ifconfig %s -promisc' % self._name)...

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