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nic_router: preserve session link state until read
See the NIC router README paragraph "Behavior regarding the NIC-session link state" for further information. Ref #3931
This commit is contained in:
Martin Stein
Norman Feske
parent
a7b878cbb5
commit
b0327d0544
@ -517,6 +517,46 @@ When set to zero, the limit is deactivated, meaning that the router always
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handles all available packets of a NIC session.
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Behavior regarding the NIC-session link state
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---------------------------------------------
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At downlinks, the NIC router applies a feedback-driven state machine for the
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link state in order to ensure that clients recognize state transitions. This
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means that the NIC router guarantees that a new link state remains fixed until
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the client has read it using the corresponding RPC at the NIC-session
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interface. If, in the meantime, further "up" and "down" edges occur, they are
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memorized and executed as soon as the former state has been read by the
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client. Such postponed link state edges are merged in a way that they result in
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two contrary edges at a max. The following diagrams demonstrate this:
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! client reads: 0 1 0 1 0 1
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! _____ _______ _________________
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! client link state: ____| |______| |_________|
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! _ __________ _________________
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! real link state: ____| |_____| |___________|
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!
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! time --->
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! client reads: 0 1 0 1 0 1
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! ______ _____________ _____
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! client link state: ____| |______| |________| |_____
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! _ _______________________ _ _ _
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! real link state: ____| |_| |_| |_| |_| |________
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!
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! time --->
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! client reads: 0 1 0 1 0 1
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! ________ _________ __________
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! client link state: ____| |____________| |______|
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! _ __ _________ _ ___________
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! real link state: ____| |_| |______________| |_| |_|
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!
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! time --->
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Examples
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~~~~~~~~
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@ -63,7 +63,9 @@ Interface_policy::Interface_policy(Genode::Session_label const &label,
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_label { label },
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_config { config },
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_session_env { session_env }
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{ }
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{
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_session_link_state_transition(UP);
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}
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Domain_name
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@ -88,6 +90,153 @@ Net::Session_component::Interface_policy::determine_domain_name() const
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}
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void Net::Session_component::
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Interface_policy::_session_link_state_transition(Transient_link_state tls)
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{
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_transient_link_state = tls;
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Signal_transmitter(_session_link_state_sigh).submit();
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}
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void Net::Session_component::Interface_policy::interface_unready()
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{
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switch (_transient_link_state) {
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case UP_ACKNOWLEDGED:
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_session_link_state_transition(DOWN);
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break;
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case UP:
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_transient_link_state = UP_DOWN;
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break;
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case DOWN_UP:
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_transient_link_state = DOWN_UP_DOWN;
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break;
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case UP_DOWN:
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break;
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case UP_DOWN_UP:
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_transient_link_state = UP_DOWN;
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break;
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case DOWN_ACKNOWLEDGED: break;
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case DOWN: break;
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case DOWN_UP_DOWN: break;
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}
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}
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void Net::Session_component::Interface_policy::interface_ready()
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{
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switch (_transient_link_state) {
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case DOWN_ACKNOWLEDGED:
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_session_link_state_transition(UP);
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break;
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case DOWN:
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_transient_link_state = DOWN_UP;
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break;
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case UP_DOWN:
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_transient_link_state = UP_DOWN_UP;
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break;
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case DOWN_UP:
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break;
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case DOWN_UP_DOWN:
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_transient_link_state = DOWN_UP;
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break;
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case UP_ACKNOWLEDGED: break;
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case UP: break;
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case UP_DOWN_UP: break;
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}
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}
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bool
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Net::Session_component::Interface_policy::interface_link_state() const
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{
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switch (_transient_link_state) {
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case DOWN_ACKNOWLEDGED: return false;
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case DOWN: return false;
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case DOWN_UP: return true;
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case DOWN_UP_DOWN: return false;
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case UP_ACKNOWLEDGED: return true;
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case UP: return true;
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case UP_DOWN: return false;
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case UP_DOWN_UP: return true;
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}
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class Never_reached : Exception { };
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throw Never_reached { };
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}
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bool
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Net::Session_component::Interface_policy::read_and_ack_session_link_state()
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{
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switch (_transient_link_state) {
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case DOWN_ACKNOWLEDGED:
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return false;
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case DOWN:
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_transient_link_state = DOWN_ACKNOWLEDGED;
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return false;
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case DOWN_UP:
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_session_link_state_transition(UP);
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return false;
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case DOWN_UP_DOWN:
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_session_link_state_transition(UP_DOWN);
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return false;
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case UP_ACKNOWLEDGED:
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return true;
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case UP:
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_transient_link_state = UP_ACKNOWLEDGED;
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return true;
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case UP_DOWN:
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_session_link_state_transition(DOWN);
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return true;
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case UP_DOWN_UP:
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_session_link_state_transition(DOWN_UP);
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return true;
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}
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class Never_reached { };
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throw Never_reached { };
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}
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void Net::Session_component::Interface_policy::
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session_link_state_sigh(Signal_context_capability sigh)
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{
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_session_link_state_sigh = sigh;
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}
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/***********************
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** Session_component **
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***********************/
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@ -109,7 +258,7 @@ Net::Session_component::Session_component(Session_env &sessio
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_interface_policy { label, _session_env, config },
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_interface { _session_env.ep(), timer, router_mac, _alloc,
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mac, config, interfaces, *_tx.sink(),
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*_rx.source(), _link_state, _interface_policy },
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*_rx.source(), _interface_policy },
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_ram_ds { ram_ds }
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{
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_interface.attach_to_domain();
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@ -121,6 +270,19 @@ Net::Session_component::Session_component(Session_env &sessio
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}
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bool Net::Session_component::link_state()
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{
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return _interface_policy.read_and_ack_session_link_state();
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}
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void Net::
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Session_component::link_state_sigh(Signal_context_capability sigh)
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{
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_interface_policy.session_link_state_sigh(sigh);
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}
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/**********
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** Root **
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**********/
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@ -257,13 +257,45 @@ class Net::Session_component : private Session_component_base,
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{
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private:
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struct Interface_policy : Net::Interface_policy
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class Interface_policy : public Net::Interface_policy
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{
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private:
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using Signal_context_capability =
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Genode::Signal_context_capability;
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/*
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* The transient link state is a combination of session and
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* interface link state. The first word in the value name
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* denotes the link state of the session. If the session
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* link state has already been read by the client and
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* can therefore be altered directly, it is marked as
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* 'ACKNOWLEDGED'. Otherwise, the denoted session state
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* has to stay fixed until the client has read it. In this
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* case, the session link state in the value name may be
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* followed by the pending link state edges. Consequently,
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* the last 'UP' or 'DOWN' in each value name denotes the
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* router-internal interface link-state.
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*/
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enum Transient_link_state
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{
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DOWN_ACKNOWLEDGED,
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DOWN,
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DOWN_UP,
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DOWN_UP_DOWN,
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UP_ACKNOWLEDGED,
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UP,
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UP_DOWN,
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UP_DOWN_UP
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};
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Genode::Session_label const _label;
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Const_reference<Configuration> _config;
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Genode::Session_env const &_session_env;
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Transient_link_state _transient_link_state { DOWN_ACKNOWLEDGED };
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Signal_context_capability _session_link_state_sigh { };
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void _session_link_state_transition(Transient_link_state tls);
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public:
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@ -271,6 +303,10 @@ class Net::Session_component : private Session_component_base,
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Genode::Session_env const &session_env,
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Configuration const &config);
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bool read_and_ack_session_link_state();
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void session_link_state_sigh(Genode::Signal_context_capability sigh);
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/***************************
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** Net::Interface_policy **
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@ -280,9 +316,11 @@ class Net::Session_component : private Session_component_base,
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void handle_config(Configuration const &config) override { _config = config; }
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Genode::Session_label const &label() const override { return _label; }
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void report(Genode::Xml_generator &xml) const override { _session_env.report(xml); };
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void interface_unready() override;
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void interface_ready() override;
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bool interface_link_state() const override;
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};
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bool _link_state { true };
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Interface_policy _interface_policy;
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Interface _interface;
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Genode::Ram_dataspace_capability const _ram_ds;
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@ -306,9 +344,8 @@ class Net::Session_component : private Session_component_base,
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******************/
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Mac_address mac_address() override { return _interface.mac(); }
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bool link_state() override { return _interface.link_state(); }
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void link_state_sigh(Genode::Signal_context_capability sigh) override {
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_interface.session_link_state_sigh(sigh); }
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bool link_state() override;
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void link_state_sigh(Genode::Signal_context_capability sigh) override;
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/***************
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@ -318,7 +318,7 @@ Interface::_transport_rules(Domain &local_domain, L3_protocol const prot) const
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void Interface::_attach_to_domain_raw(Domain &domain)
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{
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_domain = domain;
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Signal_transmitter(_session_link_state_sigh).submit();
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_policy.interface_ready();
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_interfaces.remove(this);
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domain.attach_interface(*this);
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}
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@ -330,7 +330,7 @@ void Interface::_detach_from_domain_raw()
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domain.detach_interface(*this);
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_interfaces.insert(this);
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_domain = Pointer<Domain>();
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Signal_transmitter(_session_link_state_sigh).submit();
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_policy.interface_unready();
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domain.tcp_stats().dissolve_interface(_tcp_stats);
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domain.udp_stats().dissolve_interface(_udp_stats);
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@ -347,7 +347,7 @@ void Interface::_update_domain_object(Domain &new_domain) {
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old_domain.interface_updates_domain_object(*this);
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_interfaces.insert(this);
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_domain = Pointer<Domain>();
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Signal_transmitter(_session_link_state_sigh).submit();
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_policy.interface_unready();
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old_domain.tcp_stats().dissolve_interface(_tcp_stats);
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old_domain.udp_stats().dissolve_interface(_udp_stats);
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@ -357,7 +357,7 @@ void Interface::_update_domain_object(Domain &new_domain) {
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/* attach raw */
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_domain = new_domain;
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Signal_transmitter(_session_link_state_sigh).submit();
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_policy.interface_ready();
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_interfaces.remove(this);
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new_domain.attach_interface(*this);
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}
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@ -408,12 +408,6 @@ void Interface::attach_to_ip_config(Domain &domain,
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}
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void Interface::session_link_state_sigh(Signal_context_capability sigh)
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{
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_session_link_state_sigh = sigh;
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}
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void Interface::detach_from_ip_config()
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{
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/* destroy our own ARP waiters */
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@ -440,14 +434,15 @@ void Interface::detach_from_ip_config()
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void Interface::detach_from_remote_ip_config()
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{
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/* only the DNS server address of the local DHCP server can be remote */
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Signal_transmitter(_session_link_state_sigh).submit();
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_policy.interface_unready();
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}
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void Interface::attach_to_remote_ip_config()
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{
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/* only the DNS server address of the local DHCP server can be remote */
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Signal_transmitter(_session_link_state_sigh).submit();
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_policy.interface_ready();
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}
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@ -876,11 +871,11 @@ void Interface::_send_icmp_dst_unreachable(Ipv4_address_prefix const &local_intf
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bool Interface::link_state() const
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{
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return _domain.valid() && _session_link_state;
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return _policy.interface_link_state();
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}
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void Interface::handle_link_state()
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void Interface::handle_interface_link_state()
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{
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struct Keep_ip_config : Exception { };
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try {
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@ -900,7 +895,7 @@ void Interface::handle_link_state()
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catch (Keep_ip_config) { }
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/* force report if configured */
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try { _config().report().handle_link_state(); }
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try { _config().report().handle_interface_link_state(); }
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catch (Pointer<Report>::Invalid) { }
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}
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@ -1713,12 +1708,10 @@ Interface::Interface(Genode::Entrypoint &ep,
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Interface_list &interfaces,
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Packet_stream_sink &sink,
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Packet_stream_source &source,
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bool &session_link_state,
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Interface_policy &policy)
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:
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_sink { sink },
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_source { source },
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_session_link_state { session_link_state },
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_sink_ack { ep, *this, &Interface::_ack_avail },
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_sink_submit { ep, *this, &Interface::_ready_to_submit },
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_source_ack { ep, *this, &Interface::_ready_to_ack },
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@ -92,6 +92,12 @@ struct Net::Interface_policy
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virtual Genode::Session_label const &label() const = 0;
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virtual void interface_ready() = 0;
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virtual void interface_unready() = 0;
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virtual bool interface_link_state() const = 0;
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virtual void report(Genode::Xml_generator &) const { throw Report::Empty(); }
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virtual ~Interface_policy() { }
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@ -129,8 +135,6 @@ class Net::Interface : private Interface_list::Element
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Packet_stream_sink &_sink;
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Packet_stream_source &_source;
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bool &_session_link_state;
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Signal_context_capability _session_link_state_sigh { };
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Signal_handler _sink_ack;
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Signal_handler _sink_submit;
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Signal_handler _source_ack;
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@ -351,6 +355,8 @@ class Net::Interface : private Interface_list::Element
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Ipv4_packet const &req_ip,
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Icmp_packet::Code const code);
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bool link_state() const;
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/***********************************
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** Packet-stream signal handlers **
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@ -386,7 +392,6 @@ class Net::Interface : private Interface_list::Element
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Interface_list &interfaces,
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Packet_stream_sink &sink,
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Packet_stream_source &source,
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bool &session_link_state,
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Interface_policy &policy);
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virtual ~Interface();
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@ -442,9 +447,7 @@ class Net::Interface : private Interface_list::Element
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void attach_to_domain_finish();
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bool link_state() const;
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void handle_link_state();
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void handle_interface_link_state();
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void report(Genode::Xml_generator &xml);
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@ -467,8 +470,6 @@ class Net::Interface : private Interface_list::Element
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Interface_link_stats &icmp_stats() { return _icmp_stats; }
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Interface_object_stats &arp_stats() { return _arp_stats; }
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Interface_object_stats &dhcp_stats() { return _dhcp_stats; }
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void session_link_state_sigh(Genode::Signal_context_capability sigh);
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};
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#endif /* _INTERFACE_H_ */
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@ -90,7 +90,7 @@ void Net::Report::handle_config()
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_report();
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}
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void Net::Report::handle_link_state()
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void Net::Report::handle_interface_link_state()
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{
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if (!_link_state_triggers) {
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return; }
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@ -75,7 +75,7 @@ class Net::Report
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void handle_config();
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void handle_link_state();
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void handle_interface_link_state();
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/***************
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@ -112,13 +112,33 @@ void Net::Uplink::print(Output &output) const
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***************************/
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Net::Uplink_interface_base::Uplink_interface_base(Domain_name const &domain_name,
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Session_label const &label)
|
||||
Session_label const &label,
|
||||
bool const &session_link_state)
|
||||
:
|
||||
_domain_name { domain_name },
|
||||
_label { label }
|
||||
_domain_name { domain_name },
|
||||
_label { label },
|
||||
_session_link_state { session_link_state }
|
||||
{ }
|
||||
|
||||
|
||||
void Net::Uplink_interface_base::interface_unready()
|
||||
{
|
||||
_interface_ready = false;
|
||||
};
|
||||
|
||||
|
||||
void Net::Uplink_interface_base::interface_ready()
|
||||
{
|
||||
_interface_ready = true;
|
||||
};
|
||||
|
||||
|
||||
bool Net::Uplink_interface_base::interface_link_state() const
|
||||
{
|
||||
return _interface_ready && _session_link_state;
|
||||
}
|
||||
|
||||
|
||||
/**********************
|
||||
** Uplink_interface **
|
||||
**********************/
|
||||
@ -131,14 +151,14 @@ Net::Uplink_interface::Uplink_interface(Env &env,
|
||||
Domain_name const &domain_name,
|
||||
Session_label const &label)
|
||||
:
|
||||
Uplink_interface_base { domain_name, label },
|
||||
Nic::Packet_allocator { &alloc },
|
||||
Nic::Connection { env, this, BUF_SIZE, BUF_SIZE, label.string() },
|
||||
_link_state_handler { env.ep(), *this,
|
||||
&Uplink_interface::_handle_link_state },
|
||||
_interface { env.ep(), timer, mac_address(), alloc,
|
||||
Mac_address(), config, interfaces, *rx(), *tx(),
|
||||
_link_state, *this }
|
||||
Uplink_interface_base { domain_name, label, _session_link_state },
|
||||
Nic::Packet_allocator { &alloc },
|
||||
Nic::Connection { env, this, BUF_SIZE, BUF_SIZE, label.string() },
|
||||
_session_link_state_handler { env.ep(), *this,
|
||||
&Uplink_interface::_handle_session_link_state },
|
||||
_interface { env.ep(), timer, mac_address(), alloc,
|
||||
Mac_address(), config, interfaces, *rx(), *tx(),
|
||||
*this }
|
||||
{
|
||||
/* install packet stream signal handlers */
|
||||
rx_channel()->sigh_ready_to_ack (_interface.sink_ack());
|
||||
@ -147,13 +167,13 @@ Net::Uplink_interface::Uplink_interface(Env &env,
|
||||
tx_channel()->sigh_ready_to_submit(_interface.source_submit());
|
||||
|
||||
/* initialize link state handling */
|
||||
Nic::Connection::link_state_sigh(_link_state_handler);
|
||||
_link_state = link_state();
|
||||
Nic::Connection::link_state_sigh(_session_link_state_handler);
|
||||
_session_link_state = Nic::Connection::link_state();
|
||||
}
|
||||
|
||||
|
||||
void Net::Uplink_interface::_handle_link_state()
|
||||
void Net::Uplink_interface::_handle_session_link_state()
|
||||
{
|
||||
_link_state = link_state();
|
||||
_interface.handle_link_state();
|
||||
_session_link_state = Nic::Connection::link_state();
|
||||
_interface.handle_interface_link_state();
|
||||
}
|
||||
|
||||
@ -104,8 +104,10 @@ class Net::Uplink_interface_base : public Interface_policy
|
||||
{
|
||||
private:
|
||||
|
||||
Const_reference<Domain_name> _domain_name;
|
||||
Genode::Session_label const _label;
|
||||
Const_reference<Domain_name> _domain_name;
|
||||
Genode::Session_label const _label;
|
||||
bool const &_session_link_state;
|
||||
bool _interface_ready { false };
|
||||
|
||||
|
||||
/***************************
|
||||
@ -115,11 +117,15 @@ class Net::Uplink_interface_base : public Interface_policy
|
||||
Domain_name determine_domain_name() const override { return _domain_name(); };
|
||||
void handle_config(Configuration const &) override { }
|
||||
Genode::Session_label const &label() const override { return _label; }
|
||||
void interface_unready() override;
|
||||
void interface_ready() override;
|
||||
bool interface_link_state() const override;
|
||||
|
||||
public:
|
||||
|
||||
Uplink_interface_base(Domain_name const &domain_name,
|
||||
Genode::Session_label const &label);
|
||||
Genode::Session_label const &label,
|
||||
bool const &session_link_state);
|
||||
|
||||
virtual ~Uplink_interface_base() { }
|
||||
|
||||
@ -143,13 +149,13 @@ class Net::Uplink_interface : public Uplink_interface_base,
|
||||
BUF_SIZE = Nic::Session::QUEUE_SIZE * PKT_SIZE,
|
||||
};
|
||||
|
||||
bool _link_state { false };
|
||||
Genode::Signal_handler<Uplink_interface> _link_state_handler;
|
||||
bool _session_link_state { false };
|
||||
Genode::Signal_handler<Uplink_interface> _session_link_state_handler;
|
||||
Net::Interface _interface;
|
||||
|
||||
Ipv4_address_prefix _read_interface();
|
||||
|
||||
void _handle_link_state();
|
||||
void _handle_session_link_state();
|
||||
|
||||
public:
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user