This patch adds two new methods to our API - set_mtu and get_mtu. Names are self-explanatory, the only drawback these methods have, is that setting MTU to a certain value is persistent on non-virtual devices. Workaround for this is to store mtu values before the test run and set them back after the test finished. I will try to implement persistency toggling in the future. Signed-off-by: Jiri Prochazka <jprochaz(a)redhat.com&gt; --- lnst/Controller/Machine.py | 6 ++++++ lnst/Controller/Task.py | 6 ++++++ lnst/Slave/NetTestSlave.py | 12 ++++++++++++ 3 files changed, 24 insertions(+) diff --git a/lnst/Controller/Machine.py b/lnst/Controller/Machine.py index e303c1a..fd4f004 100644 --- a/lnst/Controller/Machine.py +++ b/lnst/Controller/Machine.py @@ -696,6 +696,12 @@ class Interface(object): self._machine._rpc_call("deconfigure_interface", self.get_id()) self._configured = False + def set_mtu(self, mtu): + self._machine._rpc_call("set_mtu", self.get_id(), mtu) + + def get_mtu(self): + return self._machine._rpc_call("get_mtu", self.get_id()) + class StaticInterface(Interface): """ Static interface diff --git a/lnst/Controller/Task.py b/lnst/Controller/Task.py index be6b5cc..ee0d468 100644 --- a/lnst/Controller/Task.py +++ b/lnst/Controller/Task.py @@ -346,6 +346,12 @@ class InterfaceAPI(object): def get_ip_prefix(self, ip_index): return VolatileValue(self._if.get_prefix, ip_index) + def set_mtu(self, mtu): + self._if.set_mtu(mtu) + + def get_mtu(self): + return VolatileValue(self._if.get_mtu) + class ModuleAPI(object): """ An API class representing a module. """ diff --git a/lnst/Slave/NetTestSlave.py b/lnst/Slave/NetTestSlave.py index 8eb1f99..65601a8 100644 --- a/lnst/Slave/NetTestSlave.py +++ b/lnst/Slave/NetTestSlave.py @@ -609,6 +609,18 @@ class SlaveMethods: device.set_netns(None) return True + def set_mtu(self, if_id, mtu): + device = self._if_manager.get_mapped_device(if_id) + dev_name = device.get_name() + exec_cmd("ip link set dev %s mtu %s" % (dev_name, mtu)) + return True + + def get_mtu(self, if_id): + device = self._if_manager.get_mapped_device(if_id) + dev_name = device.get_name() + mtu, _ = exec_cmd("cat /sys/class/net/%s/mtu" % dev_name, log_outputs=False) + return mtu + class ServerHandler(ConnectionHandler): def __init__(self, addr): super(ServerHandler, self).__init__() -- 2.1.0