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LinkManagerStateMachineActiveStandby.cpp
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/*
* Copyright 2021 (c) Microsoft Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* ActiveStandbyStateMachine.cpp
*
* Created on: Oct 18, 2020
* Author: tamer
*/
#include <boost/bind/bind.hpp>
#include "link_manager/LinkManagerStateMachineActiveStandby.h"
#include "common/MuxLogger.h"
#include "common/MuxException.h"
#include "MuxPort.h"
namespace link_manager
{
constexpr auto MAX_BACKOFF_FACTOR = 128;
//
// ---> ActiveStandbyStateMachine(
// mux::MuxPort *muxPortPtr,
// boost::asio::io_service::strand &strand,
// common::MuxPortConfig &muxPortConfig
// );
//
// class constructor
//
ActiveStandbyStateMachine::ActiveStandbyStateMachine(
mux::MuxPort *muxPortPtr,
boost::asio::io_service::strand &strand,
common::MuxPortConfig &muxPortConfig
) :
LinkManagerStateMachineBase(
muxPortPtr,
strand,
muxPortConfig,
{link_prober::LinkProberState::Label::Unknown, mux_state::MuxState::Label::Wait, link_state::LinkState::Label::Down}
),
mDeadlineTimer(strand.context()),
mWaitTimer(strand.context()),
mOscillationTimer(strand.context())
{
assert(muxPortPtr != nullptr);
mMuxStateMachine.setWaitStateCause(mux_state::WaitState::WaitStateCause::SwssUpdate);
mMuxPortPtr->setMuxLinkmgrState(mLabel);
initializeTransitionFunctionTable();
}
//
// ---> initializeTransitionFunctionTable()
//
// initialize static transition function table
//
void ActiveStandbyStateMachine::initializeTransitionFunctionTable()
{
MUXLOGWARNING("Initializing State Transition Table...");
LinkManagerStateMachineBase::initializeTransitionFunctionTable();
mStateTransitionHandler[link_prober::LinkProberState::Label::Standby]
[mux_state::MuxState::Label::Active]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberStandbyMuxActiveLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Unknown]
[mux_state::MuxState::Label::Active]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberUnknownMuxActiveLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Active]
[mux_state::MuxState::Label::Standby]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberActiveMuxStandbyLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Unknown]
[mux_state::MuxState::Label::Standby]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberUnknownMuxStandbyLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Active]
[mux_state::MuxState::Label::Unknown]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberActiveMuxUnknownLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Standby]
[mux_state::MuxState::Label::Unknown]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberStandbyMuxUnknownLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Unknown]
[mux_state::MuxState::Label::Unknown]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberUnknownMuxUnknownLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Active]
[mux_state::MuxState::Label::Error]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberActiveMuxErrorLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Standby]
[mux_state::MuxState::Label::Error]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberStandbyMuxErrorLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Wait]
[mux_state::MuxState::Label::Active]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberWaitMuxActiveLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Wait]
[mux_state::MuxState::Label::Standby]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberWaitMuxStandbyLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Wait]
[mux_state::MuxState::Label::Unknown]
[link_state::LinkState::Label::Up] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberWaitMuxUnknownLinkUpTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Unknown]
[mux_state::MuxState::Label::Active]
[link_state::LinkState::Label::Down] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberUnknownMuxActiveLinkDownTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Unknown]
[mux_state::MuxState::Label::Standby]
[link_state::LinkState::Label::Down] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberUnknownMuxStandbyLinkDownTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Unknown]
[mux_state::MuxState::Label::Unknown]
[link_state::LinkState::Label::Down] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberUnknownMuxUnknownLinkDownTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Wait]
[mux_state::MuxState::Label::Active]
[link_state::LinkState::Label::Down] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberWaitMuxActiveLinkDownTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Wait]
[mux_state::MuxState::Label::Standby]
[link_state::LinkState::Label::Down] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberWaitMuxStandbyLinkDownTransitionFunction,
this,
boost::placeholders::_1
);
mStateTransitionHandler[link_prober::LinkProberState::Label::Wait]
[mux_state::MuxState::Label::Unknown]
[link_state::LinkState::Label::Down] =
boost::bind(
&ActiveStandbyStateMachine::LinkProberWaitMuxUnknownLinkDownTransitionFunction,
this,
boost::placeholders::_1
);
}
//
// ---> setLabel(Label label);
//
// sets linkmgr State db state
//
void ActiveStandbyStateMachine::setLabel(Label label) {
if (mLabel != label) {
mLabel = label;
mMuxPortPtr->setMuxLinkmgrState(label);
MUXLOGWARNING(boost::format("%s: Linkmgrd state is: %s %s") %
mMuxPortConfig.getPortName() %
mMuxStateName[ms(mCompositeState)] %
mLinkHealthName[static_cast<int> (label)]
);
}
};
//
// ---> enterLinkProberState(CompositeState &nextState, link_prober::LinkProberState::Label label, bool forceReset);
//
// force LinkProberState to switch state
//
void ActiveStandbyStateMachine::enterLinkProberState(CompositeState &nextState, link_prober::LinkProberState::Label label, bool forceReset)
{
mLinkProberStateMachinePtr->enterState(label);
if (forceReset && ps(nextState) == label) {
// only need to reset the link prober state if the state remains the same
mLinkProberStateMachinePtr->resetCurrentState();
}
ps(nextState) = label;
// link prober entering wait indicating switchover is initiated, but a switchover can be skipped if mode == manual.
if(label == link_prober::LinkProberState::Label::Wait) {
mMuxPortPtr->postLinkProberMetricsEvent(link_manager::ActiveStandbyStateMachine::LinkProberMetrics::LinkProberWaitStart);
}
}
//
// ---> enterMuxState(CompositeState &nextState, mux_state::MuxState::Label label);
//
// force MuxState to switch state
//
void ActiveStandbyStateMachine::enterMuxState(CompositeState &nextState, mux_state::MuxState::Label label)
{
mMuxStateMachine.enterState(label);
ms(nextState) = label;
}
//
// ---> enterLinkState(CompositeState &nextState, link_state::LinkState::Label label);
//
// force LinkState to switch state
//
void ActiveStandbyStateMachine::enterLinkState(CompositeState &nextState, link_state::LinkState::Label label)
{
mLinkStateMachine.enterState(label);
ls(nextState) = label;
}
//
// ---> enterMuxWaitState(CompositeState &nextState);
//
// force MuxState to switch to WaitState
//
void ActiveStandbyStateMachine::enterMuxWaitState(CompositeState &nextState)
{
enterMuxState(nextState, mux_state::MuxState::Label::Wait);
mMuxStateMachine.setWaitStateCause(mux_state::WaitState::WaitStateCause::DriverUpdate);
mMuxPortPtr->probeMuxState();
startMuxWaitTimer(MAX_BACKOFF_FACTOR);
}
//
// ---> switchMuxState(CompositeState &nextState, mux_state::MuxState::Label label, bool forceSwitch);
//
// switch Mux to switch via xcvrd to state label provider
//
void ActiveStandbyStateMachine::switchMuxState(
link_manager::ActiveStandbyStateMachine::SwitchCause cause,
CompositeState &nextState,
mux_state::MuxState::Label label,
bool forceSwitch
)
{
if (forceSwitch || mMuxPortConfig.getMode() == common::MuxPortConfig::Mode::Auto) {
MUXLOGWARNING(boost::format("%s: Switching MUX state to '%s'") %
mMuxPortConfig.getPortName() %
mMuxStateName[label]
);
// mWaitActiveUpCount is introduced to address asymmetric link drop issue.
// Resetting the count to avoid unnecessary HB suspends.
if(label == mux_state::MuxState::Label::Active) {
mWaitActiveUpCount = 0;
}
mLastSetMuxState = label;
enterMuxState(nextState, mux_state::MuxState::Label::Wait);
mMuxStateMachine.setWaitStateCause(mux_state::WaitState::WaitStateCause::SwssUpdate);
mMuxPortPtr->postMetricsEvent(Metrics::SwitchingStart, label);
mMuxPortPtr->postSwitchCause(cause);
mMuxPortPtr->setMuxState(label);
if(mMuxPortConfig.ifEnableSwitchoverMeasurement()) {
mDecreaseIntervalFnPtr(mMuxPortConfig.getLinkWaitTimeout_msec());
}
mDeadlineTimer.cancel();
startMuxWaitTimer(MAX_BACKOFF_FACTOR);
} else {
enterMuxWaitState(nextState);
}
}
//
// ---> handleSwssBladeIpv4AddressUpdate(boost::asio::ip::address address);
//
// initialize LinkProber component. Note if this is the last component to be initialized,
// state machine will be activated
//
void ActiveStandbyStateMachine::handleSwssBladeIpv4AddressUpdate(boost::asio::ip::address address)
{
if (!mComponentInitState.test(LinkProberComponent)) {
mMuxPortConfig.setBladeIpv4Address(address);
try {
mLinkProberPtr = std::make_shared<link_prober::LinkProber> (
mMuxPortConfig,
getStrand().context(),
mLinkProberStateMachinePtr.get()
);
mInitializeProberFnPtr = boost::bind(
&link_prober::LinkProber::initialize, mLinkProberPtr.get()
);
mStartProbingFnPtr = boost::bind(
&link_prober::LinkProber::startProbing, mLinkProberPtr.get()
);
mUpdateEthernetFrameFnPtr = boost::bind(
&link_prober::LinkProber::updateEthernetFrame, mLinkProberPtr.get()
);
mProbePeerTorFnPtr = boost::bind(
&link_prober::LinkProber::probePeerTor, mLinkProberPtr.get()
);
mDetectLinkFnPtr = boost::bind(
&link_prober::LinkProber::detectLink, mLinkProberPtr.get()
);
mSuspendTxFnPtr = boost::bind(
&link_prober::LinkProber::suspendTxProbes, mLinkProberPtr.get(), boost::placeholders::_1
);
mResumeTxFnPtr = boost::bind(
&link_prober::LinkProber::resumeTxProbes, mLinkProberPtr.get()
);
mSendPeerSwitchCommandFnPtr = boost::bind(
&link_prober::LinkProber::sendPeerSwitchCommand, mLinkProberPtr.get()
);
mResetIcmpPacketCountsFnPtr = boost::bind(
&link_prober::LinkProber::resetIcmpPacketCounts, mLinkProberPtr.get()
);
mShutdownTxFnPtr = boost::bind(
&link_prober::LinkProber::shutdownTxProbes, mLinkProberPtr.get()
);
mRestartTxFnPtr = boost::bind(
&link_prober::LinkProber::restartTxProbes, mLinkProberPtr.get()
);
mDecreaseIntervalFnPtr = boost::bind(
&link_prober::LinkProber::decreaseProbeIntervalAfterSwitch, mLinkProberPtr.get(), boost::placeholders::_1
);
mRevertIntervalFnPtr = boost::bind(
&link_prober::LinkProber::revertProbeIntervalAfterSwitchComplete, mLinkProberPtr.get()
);
mComponentInitState.set(LinkProberComponent);
activateStateMachine();
}
catch (const std::bad_alloc &ex) {
std::ostringstream errMsg;
errMsg << "Failed allocate memory. Exception details: " << ex.what();
throw MUX_ERROR(BadAlloc, errMsg.str());
}
} else if (address != mMuxPortConfig.getBladeIpv4Address()){
mMuxPortConfig.setBladeIpv4Address(address);
mUpdateEthernetFrameFnPtr();
}
}
//
// ---> activateStateMachine();
//
// activate the state machine by starting the LinkProber. This should be done after all
// components have been initialized.
//
void ActiveStandbyStateMachine::activateStateMachine()
{
if (mComponentInitState.all()) {
std::array<uint8_t, ETHER_ADDR_LEN> macAddress = mMuxPortConfig.getBladeMacAddress();
std::array<char, 3 * ETHER_ADDR_LEN> macAddressStr = {0};
snprintf(
macAddressStr.data(), macAddressStr.size(), "%02x:%02x:%02x:%02x:%02x:%02x",
macAddress[0], macAddress[1], macAddress[2], macAddress[3], macAddress[4], macAddress[5]
);
MUXLOGWARNING(boost::format("%s: MUX port link prober initialized with server IP: %s, server MAC: %s") %
mMuxPortConfig.getPortName() %
mMuxPortConfig.getBladeIpv4Address().to_string() %
macAddressStr.data()
);
// make link prober state match the MUX state since the state machine is activated for the first time
CompositeState nextState = mCompositeState;
initLinkProberState(nextState);
LOGWARNING_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, nextState);
mCompositeState = nextState;
mInitializeProberFnPtr();
mStartProbingFnPtr();
updateMuxLinkmgrState();
}
if (mComponentInitState.test(LinkProberComponent) && mComponentInitState.test(MuxStateComponent)) {
mMuxPortPtr->warmRestartReconciliation();
}
}
//
// ---> handleStateChange(LinkProberEvent &event, link_prober::LinkProberState::Label state);
//
// handles LinkProberEvent
//
void ActiveStandbyStateMachine::handleStateChange(LinkProberEvent &event, link_prober::LinkProberState::Label state)
{
if ((dynamic_cast<link_prober::LinkProberState *> (mLinkProberStateMachinePtr->getCurrentState()))->getStateLabel() == state) {
MUXLOGWARNING(boost::format("%s: Received link prober event, new state: %s") %
mMuxPortConfig.getPortName() %
mLinkProberStateName[state]
);
// update state db link prober metrics to collect link prober state change data
if (mContinuousLinkProberUnknownEvent == true && state != link_prober::LinkProberState::Unknown) {
mContinuousLinkProberUnknownEvent = false;
}
if (mContinuousLinkProberUnknownEvent == false && state == link_prober::LinkProberState::Label::Unknown) {
mContinuousLinkProberUnknownEvent = true;
mMuxPortPtr->postLinkProberMetricsEvent(link_manager::ActiveStandbyStateMachine::LinkProberMetrics::LinkProberUnknownStart);
}
if (state == link_prober::LinkProberState::Label::Active) {
mMuxPortPtr->postLinkProberMetricsEvent(link_manager::ActiveStandbyStateMachine::LinkProberMetrics::LinkProberActiveStart);
mStandbyUnknownUpCount = 0;
tryCancelOscillationTimerIfAlive();
}
if (state == link_prober::LinkProberState::Label::Standby) {
mMuxPortPtr->postLinkProberMetricsEvent(link_manager::ActiveStandbyStateMachine::LinkProberMetrics::LinkProberStandbyStart);
mActiveUnknownUpCount = 0;
tryCancelOscillationTimerIfAlive();
}
CompositeState nextState = mCompositeState;
ps(nextState) = state;
mStateTransitionHandler[ps(nextState)][ms(nextState)][ls(nextState)](nextState);
LOGWARNING_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, nextState);
mCompositeState = nextState;
}
if (ps(mCompositeState) != link_prober::LinkProberState::Unknown) {
mResumeTxFnPtr();
mUnknownActiveUpBackoffFactor = 1;
}
updateMuxLinkmgrState();
}
//
// ---> handleStateChange(MuxStateEvent &event, mux_state::MuxState::Label state);
//
// handles MuxStateEvent
//
void ActiveStandbyStateMachine::handleStateChange(MuxStateEvent &event, mux_state::MuxState::Label state)
{
if ((dynamic_cast<mux_state::MuxState *> (mMuxStateMachine.getCurrentState()))->getStateLabel() == state) {
MUXLOGINFO(boost::format("%s: Received mux state event, new state: %s") %
mMuxPortConfig.getPortName() %
mMuxStateName[state]
);
CompositeState nextState = mCompositeState;
ms(nextState) = state;
mStateTransitionHandler[ps(nextState)][ms(nextState)][ls(nextState)](nextState);
LOGINFO_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, nextState);
mCompositeState = nextState;
}
if (ms(mCompositeState) != mux_state::MuxState::Wait) {
// Verify if state db MUX state matches the driver/current MUX state
mMuxPortPtr->getMuxState();
// Handle pending mux mode config change
if (mPendingMuxModeChange) {
MUXLOGINFO(boost::format("%s: Mux state: %s . Execute pending MUX mode config change.") %
mMuxPortConfig.getPortName() %
mMuxStateName[ms(mCompositeState)]
);
handleMuxConfigNotification(mTargetMuxMode);
mPendingMuxModeChange = false;
}
}
if (state != mux_state::MuxState::Label::Unknown) {
mMuxUnknownBackoffFactor = 1;
mActiveUnknownUpCount = 0;
mStandbyUnknownUpCount = 0;
}
if (state == mux_state::MuxState::Label::Standby) {
tryCancelOscillationTimerIfAlive();
}
updateMuxLinkmgrState();
}
//
// ---> handleStateChange(LinkStateEvent &event, link_state::LinkState::Label state);
//
// handles LinkStateEvent
//
void ActiveStandbyStateMachine::handleStateChange(LinkStateEvent &event, link_state::LinkState::Label state)
{
if ((dynamic_cast<link_state::LinkState *> (mLinkStateMachine.getCurrentState()))->getStateLabel() == state) {
MUXLOGWARNING(boost::format("%s: Received link state event, new state: %s") %
mMuxPortConfig.getPortName() %
mLinkStateName[state]
);
CompositeState nextState = mCompositeState;
ls(nextState) = state;
if (ls(mCompositeState) == link_state::LinkState::Down &&
ls(nextState) == link_state::LinkState::Up) {
// start fresh when the link transition from Down to UP state
// and so the link prober will initially match the MUX state
// There is a problem with this approach as it will hide link flaps that result in lost heart-beats.
initLinkProberState(nextState, true);
// enterMuxWaitState(nextState);
// reset mux probing backoff factor when link goes up
mMuxUnknownBackoffFactor = 1;
} else if (ls(mCompositeState) == link_state::LinkState::Up &&
ls(nextState) == link_state::LinkState::Down &&
ms(mCompositeState) != mux_state::MuxState::Label::Standby) {
// switch MUX to standby since we are entering LinkDown state
switchMuxState(link_manager::ActiveStandbyStateMachine::SwitchCause::LinkDown, nextState, mux_state::MuxState::Label::Standby);
mActiveUnknownUpCount = 0;
mStandbyUnknownUpCount = 0;
mWaitActiveUpCount = 0;
mWaitStandbyUpBackoffFactor = 1;
mUnknownActiveUpBackoffFactor = 1;
tryCancelOscillationTimerIfAlive();
} else {
mStateTransitionHandler[ps(nextState)][ms(nextState)][ls(nextState)](nextState);
}
LOGWARNING_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, nextState);
mCompositeState = nextState;
}
updateMuxLinkmgrState();
}
//
// ---> handleGetServerMacAddressNotification(std::array<uint8_t, ETHER_ADDR_LEN> address);
//
// handle get Server MAC address
//
void ActiveStandbyStateMachine::handleGetServerMacAddressNotification(std::array<uint8_t, ETHER_ADDR_LEN> address)
{
MUXLOGINFO(mMuxPortConfig.getPortName());
if (address != mMuxPortConfig.getBladeMacAddress()) {
mMuxPortConfig.setBladeMacAddress(address);
if (mUpdateEthernetFrameFnPtr) {
mUpdateEthernetFrameFnPtr();
} else if (mComponentInitState.test(LinkProberComponent)) {
std::array<char, 3 * ETHER_ADDR_LEN> addressStr = {0};
snprintf(
addressStr.data(), addressStr.size(), "%02x:%02x:%02x:%02x:%02x:%02x",
address[0], address[1], address[2], address[3], address[4], address[5]
);
MUXLOGERROR(boost::format("%s: failed to update Ethernet frame with mac '%s', link prober init state: %d") %
mMuxPortConfig.getPortName() %
addressStr.data() %
mComponentInitState.test(LinkProberComponent)
);
}
}
}
//
// ---> handleGetMuxStateNotification(mux_state::MuxState::Label label);
//
// handle get MUX state notification
//
void ActiveStandbyStateMachine::handleGetMuxStateNotification(mux_state::MuxState::Label label)
{
MUXLOGINFO(boost::format("%s: state db mux state: %s") % mMuxPortConfig.getPortName() % mMuxStateName[label]);
if (mComponentInitState.all() &&
ms(mCompositeState) != mux_state::MuxState::Wait &&
ms(mCompositeState) != mux_state::MuxState::Error &&
ms(mCompositeState) != mux_state::MuxState::Unknown &&
(ms(mCompositeState) != label || mLastSetMuxState != label)) {
// notify swss of mux state change
MUXLOGWARNING(boost::format("%s: Switching MUX state from '%s' to '%s' to match linkmgrd/xcvrd state") %
mMuxPortConfig.getPortName() %
mMuxStateName[label] %
mMuxStateName[ms(mCompositeState)]
);
switchMuxState(link_manager::ActiveStandbyStateMachine::SwitchCause::MatchingHardwareState, mCompositeState, ms(mCompositeState), true);
}
}
//
// ---> handleProbeMuxStateNotification(mux_state::MuxState::Label label);
//
// handle MUX state notification. Source of notification could be app_db via xcvrd
//
void ActiveStandbyStateMachine::handleProbeMuxStateNotification(mux_state::MuxState::Label label)
{
MUXLOGINFO(boost::format("%s: app db mux state: %s") % mMuxPortConfig.getPortName() % mMuxStateName[label]);
mWaitTimer.cancel();
if (mComponentInitState.all()) {
if (mMuxStateMachine.getWaitStateCause() != mux_state::WaitState::WaitStateCause::DriverUpdate) {
MUXLOGWARNING(boost::format("%s: Received unsolicited MUX state probe notification!") %
mMuxPortConfig.getPortName()
);
}
postMuxStateEvent(label);
} else if (label != mux_state::MuxState::Unknown) {
MUXLOGWARNING(boost::format("%s: Initializing MUX state '%s' to match xcvrd state") %
mMuxPortConfig.getPortName() %
mMuxStateName[label]
);
// mux state was probed during initialization, update the mux state
enterMuxState(mCompositeState, mux_state::MuxState::Label::Wait);
mMuxStateMachine.setWaitStateCause(mux_state::WaitState::WaitStateCause::SwssUpdate);
mMuxPortPtr->setMuxState(label);
} else {
MUXLOGWARNING(boost::format("%s: xcvrd reports MUX state as '%s' during init. phase! Is there a functioning MUX?") %
mMuxPortConfig.getPortName() %
mMuxStateName[label]
);
enterMuxState(mCompositeState, label);
mComponentInitState.set(MuxStateComponent);
activateStateMachine();
}
}
//
// ---> handleMuxStateNotification(mux_state::MuxState::Label label);
//
// handle MUX state notification
//
void ActiveStandbyStateMachine::handleMuxStateNotification(mux_state::MuxState::Label label)
{
MUXLOGWARNING(boost::format("%s: state db mux state: %s") % mMuxPortConfig.getPortName() % mMuxStateName[label]);
mWaitTimer.cancel();
if (mComponentInitState.all()) {
if (mMuxStateMachine.getWaitStateCause() != mux_state::WaitState::WaitStateCause::SwssUpdate ||
ms(mCompositeState) != mux_state::MuxState::Wait) {
MUXLOGWARNING(boost::format("%s: Received unsolicited MUX state change notification!") %
mMuxPortConfig.getPortName()
);
}
mProbePeerTorFnPtr();
postMuxStateEvent(label);
if (mMuxStateMachine.testWaitStateCause(mux_state::WaitState::WaitStateCause::SwssUpdate)) {
mMuxPortPtr->postMetricsEvent(Metrics::SwitchingEnd, label);
mMuxStateMachine.resetWaitStateCause(mux_state::WaitState::WaitStateCause::SwssUpdate);
}
} else if (label == mux_state::MuxState::Unknown) {
// state db may not have been initialized with up-to-date mux state
// probe xcvrd to read the current mux state
enterMuxWaitState(mCompositeState);
} else {
enterMuxState(mCompositeState, label);
mComponentInitState.set(MuxStateComponent);
activateStateMachine();
}
}
//
// ---> handleSwssLinkStateNotification(const link_state::LinkState::Label label);
//
// handle link state change notification
//
void ActiveStandbyStateMachine::handleSwssLinkStateNotification(const link_state::LinkState::Label label)
{
MUXLOGINFO(boost::format("%s: state db link state: %s") % mMuxPortConfig.getPortName() % mLinkStateName[label]);
if (mComponentInitState.all()) {
if (label == link_state::LinkState::Label::Up) {
mLinkStateMachine.postLinkStateEvent(link_state::LinkStateMachine::getUpEvent());
} else if (label == link_state::LinkState::Label::Down) {
mLinkStateMachine.postLinkStateEvent(link_state::LinkStateMachine::getDownEvent());
}
} else {
enterLinkState(mCompositeState, label);
mComponentInitState.set(LinkStateComponent);
activateStateMachine();
}
}
// ---> handlePeerLinkStateNotification(const link_state::LinkState::Label label);
//
// handle peer link state change notification
//
void ActiveStandbyStateMachine::handlePeerLinkStateNotification(const link_state::LinkState::Label label)
{
MUXLOGINFO(boost::format("%s: state db peer link state: %s") % mMuxPortConfig.getPortName() % mLinkStateName[label]);
mPeerLinkState = label;
if(label == link_state::LinkState::Label::Down &&
ls(mCompositeState) == link_state::LinkState::Label::Up &&
ms(mCompositeState) == mux_state::MuxState::Standby) {
CompositeState nextState = mCompositeState;
enterLinkProberState(nextState, link_prober::LinkProberState::Wait);
if (mDefaultRouteState == DefaultRoute::OK) {
switchMuxState(link_manager::ActiveStandbyStateMachine::SwitchCause::PeerLinkDown, nextState, mux_state::MuxState::Label::Active);
}
LOGWARNING_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, nextState);
mCompositeState = nextState;
}
}
//
// ---> handleMuxConfigNotification(const common::MuxPortConfig::Mode mode);
//
// handle MUX configuration change notification
//
void ActiveStandbyStateMachine::handleMuxConfigNotification(const common::MuxPortConfig::Mode mode)
{
if (mComponentInitState.test(MuxStateComponent) &&
mode != common::MuxPortConfig::Mode::Auto &&
mode != common::MuxPortConfig::Mode::Manual &&
ms(mCompositeState) == mux_state::MuxState::Wait) {
MUXLOGINFO(boost::format("%s: Mux state: %s , mux mode config change is pending. ") %
mMuxPortConfig.getPortName() %
mMuxStateName[ms(mCompositeState)]
);
mPendingMuxModeChange = true;
mTargetMuxMode = mode;
return;
}
if (mComponentInitState.all()) {
if (mode == common::MuxPortConfig::Mode::Active &&
ms(mCompositeState) != mux_state::MuxState::Label::Active) {
CompositeState nextState = mCompositeState;
enterLinkProberState(nextState, link_prober::LinkProberState::Wait);
switchMuxState(link_manager::ActiveStandbyStateMachine::SwitchCause::ConfigMuxMode, nextState, mux_state::MuxState::Label::Active);
LOGWARNING_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, nextState);
mCompositeState = nextState;
} else if(mode == common::MuxPortConfig::Mode::Standby &&
ms(mCompositeState) != mux_state::MuxState::Label::Standby) {
mSendSwitchActiveCommandCause = link_manager::ActiveStandbyStateMachine::SwitchCause::ConfigMuxMode;
mSendPeerSwitchCommandFnPtr();
} else {
LOGWARNING_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, mCompositeState);
if (ls(mCompositeState) == link_state::LinkState::Down &&
ms(mCompositeState) != mux_state::MuxState::Label::Standby) {
CompositeState nextState = mCompositeState;
switchMuxState(link_manager::ActiveStandbyStateMachine::SwitchCause::LinkDown, nextState, mux_state::MuxState::Label::Standby, true);
LOGWARNING_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, nextState);
mCompositeState = nextState;
} else {
startMuxProbeTimer();
}
}
updateMuxLinkmgrState();
}
mMuxPortConfig.setMode(mode);
shutdownOrRestartLinkProberOnDefaultRoute();
}
//
// ---> handleSuspendTimerExpiry();
//
// handle suspend timer expiry notification from LinkProber
//
void ActiveStandbyStateMachine::handleSuspendTimerExpiry()
{
MUXLOGDEBUG(mMuxPortConfig.getPortName());
// Note: suspend timer is started when Mux state is active and link is in unknown state.
// If standby (peer) ToR fails to pull the link, this ToR will loop between those states
// Prober: Unknown, Mux: Active, Link: Up --Suspend Timer Expires--> Wait, Wait, UP -> (probe)
// Unknown, Active, Up or Unknown, Standby, UP or Unknown, Unknown, UP
if (ps(mCompositeState) == link_prober::LinkProberState::Label::Unknown &&
ms(mCompositeState) == mux_state::MuxState::Label::Active &&
ls(mCompositeState) == link_state::LinkState::Label::Up) {
CompositeState currState = mCompositeState;
enterMuxWaitState(mCompositeState);
LOGINFO_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), currState, mCompositeState);
// detect if link/server recovers
mDetectLinkFnPtr();
} else {
mUnknownActiveUpBackoffFactor = 1;
}
}
//
// ---> handleSwitchActiveCommandCompletion();
//
// handle completion of sending switch command to peer ToR
//
void ActiveStandbyStateMachine::handleSwitchActiveCommandCompletion()
{
MUXLOGDEBUG(mMuxPortConfig.getPortName());
if (ms(mCompositeState) != mux_state::MuxState::Label::Standby) {
CompositeState nextState = mCompositeState;
enterLinkProberState(nextState, link_prober::LinkProberState::Wait);
switchMuxState(mSendSwitchActiveCommandCause, nextState, mux_state::MuxState::Label::Standby, true);
LOGWARNING_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, nextState);
mCompositeState = nextState;
}
}
//
// ---> handleSwitchActiveRequestEvent();
//
// handle switch active request from peer ToR
//
void ActiveStandbyStateMachine::handleSwitchActiveRequestEvent()
{
MUXLOGDEBUG(mMuxPortConfig.getPortName());
if (ms(mCompositeState) != mux_state::MuxState::Label::Active &&
ms(mCompositeState) != mux_state::MuxState::Label::Wait) {
CompositeState nextState = mCompositeState;
enterLinkProberState(nextState, link_prober::LinkProberState::Wait);
switchMuxState(link_manager::ActiveStandbyStateMachine::SwitchCause::TlvSwitchActiveCommand, nextState, mux_state::MuxState::Label::Active);
LOGWARNING_MUX_STATE_TRANSITION(mMuxPortConfig.getPortName(), mCompositeState, nextState);
mCompositeState = nextState;
}
}
//
// ---> handleDefaultRouteStateNotification(const DefaultRoute routeState);
//
// handle default route state notification from routeorch
//
void ActiveStandbyStateMachine::handleDefaultRouteStateNotification(const DefaultRoute routeState)
{
MUXLOGDEBUG(mMuxPortConfig.getPortName());
if (mDefaultRouteState == DefaultRoute::NA && routeState == DefaultRoute::OK) {
initLinkProberState(mCompositeState);
}
mDefaultRouteState = routeState;
shutdownOrRestartLinkProberOnDefaultRoute();
updateMuxLinkmgrState();
}
//
//
// ---> shutdownOrRestartLinkProberOnDefaultRoute();
//
// shutdown or restart link prober based on default route state
//
void ActiveStandbyStateMachine::shutdownOrRestartLinkProberOnDefaultRoute()
{
MUXLOGDEBUG(mMuxPortConfig.getPortName());
if (mComponentInitState.all()) {
if (mMuxPortConfig.getMode() == common::MuxPortConfig::Mode::Auto && mDefaultRouteState == DefaultRoute::NA) {
mShutdownTxFnPtr();
} else {
// If mux mode is in manual/standby/active mode, we should restart link prober.
// If default route state is "ok", we should retart link prober.
mRestartTxFnPtr();
}
}
}
//
// ---> handlePostPckLossRatioNotification(const uint64_t unknownEventCount, const uint64_t expectedPacketCount);
//
// handle post pck loss ratio
//
void ActiveStandbyStateMachine::handlePostPckLossRatioNotification(const uint64_t unknownEventCount, const uint64_t expectedPacketCount)
{
MUXLOGDEBUG(boost::format("%s: posting pck loss ratio, pck_loss_count / pck_expected_count : %d / %d") %
mMuxPortConfig.getPortName() %
unknownEventCount %
expectedPacketCount
);
mMuxPortPtr->postPckLossRatio(unknownEventCount, expectedPacketCount);
}
// ---> handleResetLinkProberPckLossCount();
//
// reset link prober heartbeat packet loss count
//
void ActiveStandbyStateMachine::handleResetLinkProberPckLossCount()
{
MUXLOGDEBUG(boost::format("%s: reset link prober packet loss counts ") % mMuxPortConfig.getPortName());
mResetIcmpPacketCountsFnPtr();
}
// ---> handleResetSuspendTimer();
//
// reset the heartbeat suspend timer
//
void ActiveStandbyStateMachine::handleResetSuspendTimer()
{
MUXLOGDEBUG(boost::format("%s: reset heartbeat suspend timer") % mMuxPortConfig.getPortName());
if (ps(mCompositeState) == link_prober::LinkProberState::Label::Unknown &&
ms(mCompositeState) == mux_state::MuxState::Label::Active &&
ls(mCompositeState) == link_state::LinkState::Label::Up) {
mUnknownActiveUpBackoffFactor = 1;
mResumeTxFnPtr();
}
}
//
// ---> updateMuxLinkmgrState();
//
// Update State DB MUX LinkMgr state
//
void ActiveStandbyStateMachine::updateMuxLinkmgrState()
{
Label label = Label::Unhealthy;
if (ls(mCompositeState) == link_state::LinkState::Label::Up &&
((ps(mCompositeState) == link_prober::LinkProberState::Label::Active &&
ms(mCompositeState) == mux_state::MuxState::Label::Active) ||
(ps(mCompositeState) == link_prober::LinkProberState::Label::Standby &&
ms(mCompositeState) == mux_state::MuxState::Label::Standby)) &&
(mMuxPortConfig.ifEnableDefaultRouteFeature() == false || mDefaultRouteState == DefaultRoute::OK)) {
label = Label::Healthy;
mRevertIntervalFnPtr();
}
setLabel(label);
}
//
// ---> startMuxProbeTimer(uint32_t factor);
//