inlet/bmp: revert new BMP design

It needs more work to be stable. Let's do a release without it.

common/helpers/intern.go

@@ -146,18 +146,3 @@ func (p *InternPool[T]) Put(value T) InternReference[T] {
 func (p *InternPool[T]) Len() int {
 	return len(p.values) - len(p.availableIndexes) - 1
 }
-
-// Clone returns a copy of the intern pool.
-func (p *InternPool[T]) Clone() *InternPool[T] {
-	result := &InternPool[T]{
-		values:           make([]internValue[T], len(p.values)),
-		availableIndexes: make([]InternReference[T], len(p.availableIndexes)),
-		valueIndexes:     make(map[uint64]InternReference[T], len(p.valueIndexes)),
-	}
-	copy(result.values, p.values)
-	copy(result.availableIndexes, p.availableIndexes)
-	for k, v := range p.valueIndexes {
-		result.valueIndexes[k] = v
-	}
-	return result
-}

common/helpers/intern_test.go

@@ -166,30 +166,3 @@ func TestTake(t *testing.T) {
 		t.Fatalf("Take() didn't free everything (%d remaining)", diff)
 	}
 }
-
-func TestClone(t *testing.T) {
-	p := NewInternPool[likeInt]()
-	a := p.Put(likeInt(10))
-	b := p.Put(likeInt(11))
-	c := p.Put(likeInt(12))
-
-	q := p.Clone()
-	q.Take(a)
-	q.Take(b)
-	d := q.Put(likeInt(12))
-	e := q.Put(likeInt(13))
-	f := p.Put(likeInt(13))
-
-	if p.Len() != 4 {
-		t.Errorf("p.Len() should be 4, not %d", q.Len())
-	}
-	if q.Len() != 2 {
-		t.Errorf("q.Len() should be 2, not %d", q.Len())
-	}
-	if d != c {
-		t.Error("12 should have the same ref in both")
-	}
-	if e == f {
-		t.Error("13 should not have the same ref in both")
-	}
-}

console/data/docs/02-configuration.md

@@ -129,15 +129,6 @@ The following keys are accepted:
   not supported)
 - `keep` tells how much time the routes sent from a terminated BMP
   connection should be kept
-- `rib-mode` gives a choice on how to handle the internal RIB. `memory` (the
-  default) keeps only one copy of the RIB and lookups may be slightly since they
-  are processed sequentially by a single routine. `performance` copy the live
-  RIB to a read-only version from time to time (after `rib-idle-update-delay`
-  when the RIB is not updated, no more than `rib-minimum-update-delay` but at
-  least every `rib-maximum-update-delay`). With this mode, lookups can be
-  processed in parallel but there are three copies of the RIB in memory (in the
-  future, we may reduce this to two copies). With 1 million routes, a RIB is
-  about 50 MB.
 
 If you are not interested in AS paths and communities, disabling them
 will decrease the memory usage of *Akvorado*, as well as the disk

console/data/docs/05-troubleshooting.md

@@ -206,13 +206,6 @@ for other exporters. However, ensuring the exporters accept to answer
 requests is the first fix. If not enough, you can increase the number
 of workers. Workers handle SNMP requests synchronously.
 
-#### BMP collector
-
-The BMP collector may handle million of routes. This can stress the system
-during large updates. If you send many routes to the BMP collector, you can
-switch the RIB mode of the collector to `performance`. Check the [documentation
-about BMP](02-configuration.md#bmp) for more details.
-
 ### Reported traffic levels are incorrect
 
 Use `curl -s http://akvorado/api/v0/inlet/flows\?limit=1 | grep

console/data/docs/99-changelog.md

@@ -13,18 +13,12 @@ identified with a specific icon:
 
 ## Unreleased
 
-The BMP collector has been optimized in memory (more than 50%) and locks were
-removed to reduce latency during lookups. There are two modes available. They
-can be selected with `inlet.bmp.rib-mode`. If you have several million routes,
-be sure to check the [BMP documentation](02-configuration.md#bmp) for more
-details.
-
 - ✨ *console*: add *100% stacked* graph type
 - 🩹 *inlet*: handle non-fatal BMP decoding errors more gracefully
 - 🩹 *inlet*: fix a small memory leak in BMP collector
 - 🩹 *console*: fix selection of the aggregate table to not get empty graphs
 - 🩹 *console*: use configured dimensions limit for “Visualize” tab
-- 🌱 *inlet*: optimize BMP collector (see above)
+- 🌱 *inlet*: optimize BMP CPU usage, memory usage, and lock times 
 - 🌱 *inlet*: replace LRU cache for classifiers by a time-based cache
 - 🌱 *inlet*: add TLS support for Kafka transport
 - 🌱 *console*: <kbd>Ctrl-Enter</kbd> or <kbd>Cmd-Enter</kbd> when editing a filter now applies the changes

inlet/bmp/config.go

@@ -3,11 +3,7 @@
 
 package bmp
 
-import (
+import "time"
-	"errors"
-	"strings"
-	"time"
-)
 
 // Configuration describes the configuration for the BMP server.
 type Configuration struct {
@@ -24,22 +20,14 @@ type Configuration struct {
 	CollectCommunities bool
 	// Keep tells how long to keep routes from a BMP client when it goes down
 	Keep time.Duration `validate:"min=1s"`
-	// RIBMode tells which mode to use for the RIB
+	// PeerRemovalMaxTime tells the maximum time the removal worker should run to remove a peer
-	RIBMode RIBMode
+	PeerRemovalMaxTime time.Duration `validate:"min=10ms"`
-	// RIBIdleUpdateDelay tells to update the read-only RIB after being idle for
+	// PeerRemovalSleepInterval tells how much time to sleep between two runs of the removal worker
-	// that duration. This is only when RIB is in performance mode.
+	PeerRemovalSleepInterval time.Duration `validate:"min=10ms"`
-	RIBIdleUpdateDelay time.Duration `validate:"min=1s"`
+	// PeerRemovalMaxQueue tells how many pending removal requests to keep
-	// RIBMinimumUpdateDelay tells to not update the read-only RIB less than
+	PeerRemovalMaxQueue int `validate:"min=1"`
-	// that. This is only when RIB is in performance mode.
+	// PeerRemovalMinRoutes tells how many routes we have to remove in one run before yielding
-	RIBMinimumUpdateDelay time.Duration `validate:"min=1s,gtfield=RIBIdleUpdateDelay"`
+	PeerRemovalMinRoutes int `validate:"min=1"`
-	// RIBMaximumUpdateDelay tells to update the read-only RIB at least once
-	// every the specified delay (if there are updates). This is only if RIB is
-	// in performance mode.
-	RIBMaximumUpdateDelay time.Duration `validate:"min=1s,gtfield=RIBMinimumUpdateDelay"`
-	// RIBPeerRemovalBatchRoutes tells how many routes to remove before checking
-	// if we have a higher priority request. This is only if RIB is in memory
-	// mode.
-	RIBPeerRemovalBatchRoutes int `validate:"min=1"`
 }
 
 // DefaultConfiguration represents the default configuration for the BMP server
@@ -50,48 +38,9 @@ func DefaultConfiguration() Configuration {
 		CollectASPaths:           true,
 		CollectCommunities:       true,
 		Keep:                     5 * time.Minute,
-		RIBMode:                   RIBModeMemory,
+		PeerRemovalMaxTime:       200 * time.Millisecond,
-		RIBIdleUpdateDelay:        5 * time.Second,
+		PeerRemovalSleepInterval: 500 * time.Millisecond,
-		RIBMinimumUpdateDelay:     20 * time.Second,
+		PeerRemovalMaxQueue:      10000,
-		RIBMaximumUpdateDelay:     2 * time.Minute,
+		PeerRemovalMinRoutes:     5000,
-		RIBPeerRemovalBatchRoutes: 1000,
 	}
 }
-
-// RIBMode is the mode used for the RIB
-type RIBMode int
-
-const (
-	// RIBModeMemory tries to minimize used memory
-	RIBModeMemory RIBMode = iota
-	// RIBModePerformance keep a read-only copy of the RIB for lookups
-	RIBModePerformance
-)
-
-// UnmarshalText parses a RIBMode
-func (m *RIBMode) UnmarshalText(text []byte) error {
-	modes := map[string]RIBMode{
-		"memory":      RIBModeMemory,
-		"performance": RIBModePerformance,
-	}
-	mode, ok := modes[strings.ToLower(string(text))]
-	if !ok {
-		return errors.New("unknown RIB mode")
-	}
-	*m = mode
-	return nil
-}
-
-// String turns a RIB mode to a string
-func (m RIBMode) String() string {
-	modes := map[RIBMode]string{
-		RIBModeMemory:      "memory",
-		RIBModePerformance: "performance",
-	}
-	return modes[m]
-}
-
-// MarshalText turns a RIB mode to a string
-func (m RIBMode) MarshalText() ([]byte, error) {
-	return []byte(m.String()), nil
-}

inlet/bmp/events.go

@@ -4,14 +4,11 @@
 package bmp
 
 import (
-	"context"
 	"encoding/binary"
-	"errors"
+	"fmt"
 	"net/netip"
 	"time"
 
-	"akvorado/common/reporter"
-
 	"github.com/osrg/gobgp/v3/pkg/packet/bgp"
 	"github.com/osrg/gobgp/v3/pkg/packet/bmp"
 )
@@ -30,6 +27,7 @@ type peerKey struct {
 type peerInfo struct {
 	reference          uint32                   // used as a reference in the RIB
 	staleUntil         time.Time                // when to remove because it is stale
+	marshallingOptions []*bgp.MarshallingOption // decoding option (add-path mostly)
 }
 
 // peerKeyFromBMPPeerHeader computes the peer key from the BMP peer header.
@@ -45,223 +43,11 @@ func peerKeyFromBMPPeerHeader(exporter netip.AddrPort, header *bmp.BMPPeerHeader
 	}
 }
 
-// ribWorkerState is the state of the rib worker (accessible through the worker
+// scheduleStalePeersRemoval schedule the next time a peer should be
-// only).
+// removed. This should be called with the lock held.
-type ribWorkerState struct {
+func (c *Component) scheduleStalePeersRemoval() {
-	ctx               context.Context
-	rib               *rib
-	peers             map[peerKey]*peerInfo
-	peerLastReference uint32
-}
-
-// ribWorkerPayload is what we provide the RIB worker with. The channel will be
-// closed when done.
-type ribWorkerPayload struct {
-	fn            func(*ribWorkerState) error
-	interruptible bool
-	done          chan<- struct{}
-}
-
-var errRIBWorkerCanceled = errors.New("RIB worker timeout")
-
-// ribWorker handle RIB-related operations (everything involving updating RIB
-// and related structures). Tasks are functions queued inside the worker.
-func (c *Component) ribWorker() error {
-	state := &ribWorkerState{
-		rib:   newRIB(),
-		peers: make(map[peerKey]*peerInfo),
-	}
-	// Assume the last copy was done before minimum update delay
-	lastCopy := time.Now().Add(-c.config.RIBMinimumUpdateDelay)
-	nextTimer := time.NewTimer(c.config.RIBMaximumUpdateDelay)
-	timer := "maximum"
-	uptodate := true
-	priorityPayloads := make(chan ribWorkerPayload, 1)
-	pausedPayloads := make(chan ribWorkerPayload, 1)
-
-	if c.config.RIBMode == RIBModePerformance {
-		c.r.GaugeFunc(
-			reporter.GaugeOpts{
-				Name: "rib_lag_seconds",
-				Help: "How outdated is the readonly RIB.",
-			},
-			func() float64 {
-				if uptodate {
-					return 0
-				}
-				return time.Now().Sub(lastCopy).Seconds()
-			},
-		)
-	}
-
-	handleLowPriorityPayload := func(payload ribWorkerPayload) error {
-		// These low priority operations can be canceled when a high priority request happens.
-		if c.config.RIBMode == RIBModeMemory && payload.interruptible {
-			ctx, cancel := context.WithCancel(c.t.Context(context.Background()))
-			state.ctx = ctx
-			defer cancel()
-			go func() {
-				select {
-				case <-c.t.Dying():
-				case <-ctx.Done():
-				case payload := <-c.ribWorkerPrioChan:
-					priorityPayloads <- payload
-					cancel()
-				}
-			}()
-		}
-
-		uptodate = false
-		err := payload.fn(state)
-		if err == errRIBWorkerCanceled {
-			pausedPayloads <- payload
-			return nil
-		}
-		close(payload.done)
-		if err != nil {
-			return err
-		}
-
-		if c.config.RIBMode == RIBModePerformance {
-			if !nextTimer.Stop() {
-				select {
-				case <-nextTimer.C:
-				default:
-				}
-			}
-			now := time.Now()
-			delta := now.Sub(lastCopy)
-			if delta < c.config.RIBMinimumUpdateDelay {
-				nextTimer.Reset(c.config.RIBMinimumUpdateDelay - delta)
-				timer = "minimum"
-			} else if delta < c.config.RIBMaximumUpdateDelay-c.config.RIBIdleUpdateDelay {
-				nextTimer.Reset(c.config.RIBIdleUpdateDelay)
-				timer = "idle"
-			} else if delta >= c.config.RIBMaximumUpdateDelay {
-				c.updateRIBReadonly(state, "maximum")
-				lastCopy = now
-				uptodate = true
-			} else {
-				nextTimer.Reset(c.config.RIBMaximumUpdateDelay - delta)
-				timer = "maximum"
-			}
-		}
-		return nil
-	}
-
-	for {
-		state.ctx = nil
-		select {
-		// Two "high priority" chans: one for internal, one for external
-		case payload := <-priorityPayloads:
-			err := payload.fn(state)
-			close(payload.done)
-			if err != nil {
-				return err
-			}
-		case payload := <-c.ribWorkerPrioChan:
-			err := payload.fn(state)
-			close(payload.done)
-			if err != nil {
-				return err
-			}
-		default:
-			select {
-			case <-c.t.Dying():
-				return nil
-			// No need to watch for internal high priority, it should have been
-			// handled before. We can still get high priority requests from the
-			// external one.
-			case payload := <-c.ribWorkerPrioChan:
-				err := payload.fn(state)
-				close(payload.done)
-				if err != nil {
-					return err
-				}
-			case payload := <-pausedPayloads:
-				if err := handleLowPriorityPayload(payload); err != nil {
-					return err
-				}
-			case payload := <-c.ribWorkerChan:
-				if err := handleLowPriorityPayload(payload); err != nil {
-					return err
-				}
-			case <-nextTimer.C:
-				c.updateRIBReadonly(state, timer)
-				lastCopy = time.Now()
-				uptodate = true
-			}
-		}
-	}
-}
-
-type ribWorkerQueueOptions int
-
-const (
-	ribWorkerHighPriority ribWorkerQueueOptions = iota
-	ribWorkerInterruptible
-)
-
-// ribWorkerQueue queues a new task for the RIB worker thread. We wait for the
-// task to be handled. We don't want to queue up a lot of tasks asynchronously.
-func (c *Component) ribWorkerQueue(fn func(*ribWorkerState) error, options ...ribWorkerQueueOptions) {
-	ch := c.ribWorkerChan
-	done := make(chan struct{})
-	payload := ribWorkerPayload{
-		fn:   fn,
-		done: done,
-	}
-	for _, option := range options {
-		switch option {
-		case ribWorkerHighPriority:
-			ch = c.ribWorkerPrioChan
-		case ribWorkerInterruptible:
-			payload.interruptible = true
-		}
-	}
-	select {
-	case <-c.t.Dying():
-	case ch <- payload:
-		select {
-		case <-c.t.Dying():
-		case <-done:
-		}
-	}
-}
-
-// updateRIBReadonly updates the read-only copy of the RIB
-func (c *Component) updateRIBReadonly(s *ribWorkerState, timer string) {
-	if c.config.RIBMode == RIBModePerformance {
-		c.r.Debug().Msg("copy live RIB to read-only version")
-		start := time.Now()
-		defer c.metrics.ribCopies.WithLabelValues(timer).Observe(
-			float64(time.Now().Sub(start).Nanoseconds()) / 1000 / 1000 / 1000)
-		new := s.rib.clone()
-		c.ribReadonly.Store(new)
-	}
-}
-
-// addPeer provides a reference to a new peer.
-func (c *Component) addPeer(s *ribWorkerState, pkey peerKey) *peerInfo {
-	s.peerLastReference++
-	if s.peerLastReference == 0 {
-		// This is a very unlikely event, but we don't
-		// have anything better. Let's crash (and
-		// hopefully be restarted).
-		c.r.Fatal().Msg("too many peer up events")
-		go c.Stop()
-	}
-	pinfo := &peerInfo{
-		reference: s.peerLastReference,
-	}
-	s.peers[pkey] = pinfo
-	return pinfo
-}
-
-// scheduleStalePeersRemoval schedule the next time a peer should be removed.
-func (c *Component) scheduleStalePeersRemoval(s *ribWorkerState) {
 	var next time.Time
-	for _, pinfo := range s.peers {
+	for _, pinfo := range c.peers {
 		if pinfo.staleUntil.IsZero() {
 			continue
 		}
@@ -271,85 +57,102 @@ func (c *Component) scheduleStalePeersRemoval(s *ribWorkerState) {
 	}
 	if next.IsZero() {
 		c.r.Debug().Msg("no stale peer")
-		c.peerStaleTimer.Stop()
+		c.staleTimer.Stop()
 	} else {
 		c.r.Debug().Msgf("next removal for stale peer scheduled on %s", next)
-		c.peerStaleTimer.Reset(c.d.Clock.Until(next))
+		c.staleTimer.Reset(c.d.Clock.Until(next))
 	}
 }
 
-// removePeer remove a peer.
+// removeStalePeers remove the stale peers.
-func (c *Component) removePeer(s *ribWorkerState, pkey peerKey, reason string) error {
+func (c *Component) removeStalePeers() {
-	exporterStr := pkey.exporter.Addr().Unmap().String()
-	peerStr := pkey.ip.Unmap().String()
-	pinfo := s.peers[pkey]
-	c.r.Info().Msgf("remove peer %s for exporter %s (reason: %s)", peerStr, exporterStr, reason)
-	removed, done := s.rib.flushPeerContext(s.ctx, pinfo.reference, c.config.RIBPeerRemovalBatchRoutes)
-	c.metrics.routes.WithLabelValues(exporterStr).Sub(float64(removed))
-	if !done {
-		c.metrics.peerRemovalPartial.WithLabelValues(exporterStr).Inc()
-		return errRIBWorkerCanceled
-	}
-	c.metrics.peerRemovalDone.WithLabelValues(exporterStr).Inc()
-	c.metrics.peers.WithLabelValues(exporterStr).Dec()
-	delete(s.peers, pkey)
-	return nil
-}
-
-// handleStalePeers remove the stale peers.
-func (c *Component) handleStalePeers() {
-	c.ribWorkerQueue(func(s *ribWorkerState) error {
 	start := c.d.Clock.Now()
 	c.r.Debug().Msg("remove stale peers")
-		for pkey, pinfo := range s.peers {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	for pkey, pinfo := range c.peers {
 		if pinfo.staleUntil.IsZero() || pinfo.staleUntil.After(start) {
 			continue
 		}
-			if err := c.removePeer(s, pkey, "stale"); err != nil {
+		c.removePeer(pkey, "stale")
-				return err
 	}
+	c.scheduleStalePeersRemoval()
+}
+
+func (c *Component) addPeer(pkey peerKey) *peerInfo {
+	c.lastPeerReference++
+	if c.lastPeerReference == 0 {
+		// This is a very unlikely event, but we don't
+		// have anything better. Let's crash (and
+		// hopefully be restarted).
+		c.r.Fatal().Msg("too many peer up events")
+		go c.Stop()
 	}
-		c.scheduleStalePeersRemoval(s)
+	pinfo := &peerInfo{
-		return nil
+		reference: c.lastPeerReference,
-	}, ribWorkerInterruptible)
+	}
+	c.peers[pkey] = pinfo
+	return pinfo
+}
+
+// removePeer remove a peer (with lock held)
+func (c *Component) removePeer(pkey peerKey, reason string) {
+	exporterStr := pkey.exporter.Addr().Unmap().String()
+	peerStr := pkey.ip.Unmap().String()
+	c.r.Info().Msgf("remove peer %s for exporter %s (reason: %s)", peerStr, exporterStr, reason)
+	select {
+	case c.peerRemovalChan <- pkey:
+		return
+	default:
+	}
+	c.metrics.peerRemovalQueueFull.WithLabelValues(exporterStr).Inc()
+	c.mu.Unlock()
+	select {
+	case c.peerRemovalChan <- pkey:
+	case <-c.t.Dying():
+	}
+	c.mu.Lock()
+}
+
+// markExporterAsStale marks all peers from an exporter as stale.
+func (c *Component) markExporterAsStale(exporter netip.AddrPort, until time.Time) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	for pkey, pinfo := range c.peers {
+		if pkey.exporter != exporter {
+			continue
+		}
+		pinfo.staleUntil = until
+	}
+	c.scheduleStalePeersRemoval()
 }
 
 // handlePeerDownNotification handles a peer-down notification by
 // removing the peer.
 func (c *Component) handlePeerDownNotification(pkey peerKey) {
-	c.ribWorkerQueue(func(s *ribWorkerState) error {
+	c.mu.Lock()
-		_, ok := s.peers[pkey]
+	defer c.mu.Unlock()
+	_, ok := c.peers[pkey]
 	if !ok {
 		c.r.Info().Msgf("received peer down from exporter %s for peer %s, but no peer up",
 			pkey.exporter.Addr().Unmap().String(),
 			pkey.ip.Unmap().String())
-			return nil
+		return
 	}
-		return c.removePeer(s, pkey, "down")
+	c.removePeer(pkey, "down")
-	}, ribWorkerInterruptible)
 }
 
 // handleConnectionDown handles a disconnect or a session termination
 // by marking all associated peers as stale.
 func (c *Component) handleConnectionDown(exporter netip.AddrPort) {
 	until := c.d.Clock.Now().Add(c.config.Keep)
-	c.ribWorkerQueue(func(s *ribWorkerState) error {
+	c.markExporterAsStale(exporter, until)
-		for pkey, pinfo := range s.peers {
-			if pkey.exporter != exporter {
-				continue
-			}
-			pinfo.staleUntil = until
-		}
-		c.scheduleStalePeersRemoval(s)
-		return nil
-	})
 }
 
 // handleConnectionUp handles the connection from a new exporter.
 func (c *Component) handleConnectionUp(exporter netip.AddrPort) {
-	// Do it without RIB worker, we just update counters.
-	// Do not set to 0, exporterStr may cover several exporters.
 	exporterStr := exporter.Addr().Unmap().String()
+	// Do not set to 0, exporterStr may cover several exporters.
 	c.metrics.peers.WithLabelValues(exporterStr).Add(0)
 	c.metrics.routes.WithLabelValues(exporterStr).Add(0)
 }
@@ -359,23 +162,63 @@ func (c *Component) handlePeerUpNotification(pkey peerKey, body *bmp.BMPPeerUpNo
 	if body.ReceivedOpenMsg == nil || body.SentOpenMsg == nil {
 		return
 	}
+	c.mu.Lock()
+	defer c.mu.Unlock()
 
-	c.ribWorkerQueue(func(s *ribWorkerState) error {
 	exporterStr := pkey.exporter.Addr().Unmap().String()
 	peerStr := pkey.ip.Unmap().String()
-		_, ok := s.peers[pkey]
+	pinfo, ok := c.peers[pkey]
 	if ok {
 		c.r.Info().Msgf("received extra peer up from exporter %s for peer %s",
 			exporterStr, peerStr)
 	} else {
 		// Peer does not exist at all
 		c.metrics.peers.WithLabelValues(exporterStr).Inc()
-			c.addPeer(s, pkey)
+		pinfo = c.addPeer(pkey)
 	}
 
-		c.r.Debug().Msgf("new peer %s from exporter %s", peerStr, exporterStr)
+	// Check for ADD-PATH support.
-		return nil
+	receivedAddPath := map[bgp.RouteFamily]bgp.BGPAddPathMode{}
-	})
+	received, _ := body.ReceivedOpenMsg.Body.(*bgp.BGPOpen)
+	for _, param := range received.OptParams {
+		switch param := param.(type) {
+		case *bgp.OptionParameterCapability:
+			for _, cap := range param.Capability {
+				switch cap := cap.(type) {
+				case *bgp.CapAddPath:
+					for _, tuple := range cap.Tuples {
+						receivedAddPath[tuple.RouteFamily] = tuple.Mode
+					}
+				}
+			}
+		}
+	}
+	sent, _ := body.SentOpenMsg.Body.(*bgp.BGPOpen)
+	addPathOption := map[bgp.RouteFamily]bgp.BGPAddPathMode{}
+	for _, param := range sent.OptParams {
+		switch param := param.(type) {
+		case *bgp.OptionParameterCapability:
+			for _, cap := range param.Capability {
+				switch cap := cap.(type) {
+				case *bgp.CapAddPath:
+					for _, sent := range cap.Tuples {
+						receivedMode := receivedAddPath[sent.RouteFamily]
+						if receivedMode == bgp.BGP_ADD_PATH_BOTH || receivedMode == bgp.BGP_ADD_PATH_SEND {
+							if sent.Mode == bgp.BGP_ADD_PATH_BOTH || sent.Mode == bgp.BGP_ADD_PATH_RECEIVE {
+								// We have at least the receive mode. We only do decoding.
+								addPathOption[sent.RouteFamily] = bgp.BGP_ADD_PATH_RECEIVE
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	pinfo.marshallingOptions = []*bgp.MarshallingOption{{AddPath: addPathOption}}
+
+	c.r.Debug().
+		Str("addpath", fmt.Sprintf("%s", addPathOption)).
+		Msgf("new peer %s from exporter %s", peerStr, exporterStr)
 }
 
 func (c *Component) handleRouteMonitoring(pkey peerKey, body *bmp.BMPRouteMonitoring) {
@@ -388,23 +231,24 @@ func (c *Component) handleRouteMonitoring(pkey peerKey, body *bmp.BMPRouteMonito
 		return
 	}
 
-	c.ribWorkerQueue(func(s *ribWorkerState) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
 
 	// Ignore this peer if this is a L3VPN and it does not have
 	// the right RD.
 	if pkey.ptype == bmp.BMP_PEER_TYPE_L3VPN && !c.isAcceptedRD(pkey.distinguisher) {
-			return nil
+		return
 	}
 
 	exporterStr := pkey.exporter.Addr().Unmap().String()
 	peerStr := pkey.ip.Unmap().String()
-		pinfo, ok := s.peers[pkey]
+	pinfo, ok := c.peers[pkey]
 	if !ok {
 		// We may have missed the peer down notification?
 		c.r.Info().Msgf("received route monitoring from exporter %s for peer %s, but no peer up",
 			exporterStr, peerStr)
 		c.metrics.peers.WithLabelValues(exporterStr).Inc()
-			pinfo = c.addPeer(s, pkey)
+		pinfo = c.addPeer(pkey)
 	}
 
 	var nh netip.Addr
@@ -456,15 +300,15 @@ func (c *Component) handleRouteMonitoring(pkey peerKey, body *bmp.BMPRouteMonito
 				plen += 96
 			}
 			p, _ := netip.AddrFromSlice(prefix)
-				added += s.rib.addPrefix(p, plen, route{
+			added += c.rib.addPrefix(p, plen, route{
 				peer: pinfo.reference,
-					nlri: s.rib.nlris.Put(nlri{
+				nlri: c.rib.nlris.Put(nlri{
 					family: bgp.RF_IPv4_UC,
 					path:   ipprefix.PathIdentifier(),
 					rd:     pkey.distinguisher,
 				}),
-					nextHop:    s.rib.nextHops.Put(nextHop(nh)),
+				nextHop:    c.rib.nextHops.Put(nextHop(nh)),
-					attributes: s.rib.rtas.Put(rta),
+				attributes: c.rib.rtas.Put(rta),
 			})
 		}
 		for _, ipprefix := range update.WithdrawnRoutes {
@@ -475,12 +319,12 @@ func (c *Component) handleRouteMonitoring(pkey peerKey, body *bmp.BMPRouteMonito
 				plen += 96
 			}
 			p, _ := netip.AddrFromSlice(prefix)
-				if nlriRef, ok := s.rib.nlris.Ref(nlri{
+			if nlriRef, ok := c.rib.nlris.Ref(nlri{
 				family: bgp.RF_IPv4_UC,
 				path:   ipprefix.PathIdentifier(),
 				rd:     pkey.distinguisher,
 			}); ok {
-					removed += s.rib.removePrefix(p, plen, route{
+				removed += c.rib.removePrefix(p, plen, route{
 					peer: pinfo.reference,
 					nlri: nlriRef,
 				})
@@ -549,23 +393,23 @@ func (c *Component) handleRouteMonitoring(pkey peerKey, body *bmp.BMPRouteMonito
 			}
 			switch attr.(type) {
 			case *bgp.PathAttributeMpReachNLRI:
-					added += s.rib.addPrefix(p, plen, route{
+				added += c.rib.addPrefix(p, plen, route{
 					peer: pinfo.reference,
-						nlri: s.rib.nlris.Put(nlri{
+					nlri: c.rib.nlris.Put(nlri{
 						family: bgp.AfiSafiToRouteFamily(ipprefix.AFI(), ipprefix.SAFI()),
 						rd:     rd,
 						path:   ipprefix.PathIdentifier(),
 					}),
-						nextHop:    s.rib.nextHops.Put(nextHop(nh)),
+					nextHop:    c.rib.nextHops.Put(nextHop(nh)),
-						attributes: s.rib.rtas.Put(rta),
+					attributes: c.rib.rtas.Put(rta),
 				})
 			case *bgp.PathAttributeMpUnreachNLRI:
-					if nlriRef, ok := s.rib.nlris.Ref(nlri{
+				if nlriRef, ok := c.rib.nlris.Ref(nlri{
 					family: bgp.AfiSafiToRouteFamily(ipprefix.AFI(), ipprefix.SAFI()),
 					rd:     rd,
 					path:   ipprefix.PathIdentifier(),
 				}); ok {
-						removed += s.rib.removePrefix(p, plen, route{
+					removed += c.rib.removePrefix(p, plen, route{
 						peer: pinfo.reference,
 						nlri: nlriRef,
 					})
@@ -575,8 +419,6 @@ func (c *Component) handleRouteMonitoring(pkey peerKey, body *bmp.BMPRouteMonito
 	}
 
 	c.metrics.routes.WithLabelValues(exporterStr).Add(float64(added - removed))
-		return nil
-	})
 }
 
 func (c *Component) isAcceptedRD(rd RD) bool {

inlet/bmp/lookup.go

@@ -23,23 +23,25 @@ type LookupResult struct {
 // provided next hop if provided. This is somewhat approximate because
 // we use the best route we have, while the exporter may not have this
 // best route available. The returned result should not be modified!
-func (c *Component) Lookup(addrIP net.IP, nextHopIP net.IP) (result LookupResult) {
+func (c *Component) Lookup(addrIP net.IP, nextHopIP net.IP) LookupResult {
 	if !c.config.CollectASNs && !c.config.CollectASPaths && !c.config.CollectCommunities {
-		return
+		return LookupResult{}
 	}
 	ip, _ := netip.AddrFromSlice(addrIP.To16())
 	nh, _ := netip.AddrFromSlice(nextHopIP.To16())
 	v6 := patricia.NewIPv6Address(ip.AsSlice(), 128)
 
-	lookup := func(rib *rib) error {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
 	bestFound := false
 	found := false
-		_, routes := rib.tree.FindDeepestTagsWithFilter(v6, func(route route) bool {
+	_, routes := c.rib.tree.FindDeepestTagsWithFilter(v6, func(route route) bool {
 		if bestFound {
 			// We already have the best route, skip remaining routes
 			return false
 		}
-			if rib.nextHops.Get(route.nextHop) == nextHop(nh) {
+		if c.rib.nextHops.Get(route.nextHop) == nextHop(nh) {
 			// Exact match found, use it and don't search further
 			bestFound = true
 			return true
@@ -53,25 +55,13 @@ func (c *Component) Lookup(addrIP net.IP, nextHopIP net.IP) (result LookupResult
 		return false
 	})
 	if len(routes) == 0 {
-			return nil
+		return LookupResult{}
 	}
-		attributes := rib.rtas.Get(routes[len(routes)-1].attributes)
+	attributes := c.rib.rtas.Get(routes[len(routes)-1].attributes)
-		result = LookupResult{
+	return LookupResult{
 		ASN:              attributes.asn,
 		ASPath:           attributes.asPath,
 		Communities:      attributes.communities,
 		LargeCommunities: attributes.largeCommunities,
 	}
-		return nil
-	}
-
-	switch c.config.RIBMode {
-	case RIBModeMemory:
-		c.ribWorkerQueue(func(s *ribWorkerState) error {
-			return lookup(s.rib)
-		}, ribWorkerHighPriority)
-	case RIBModePerformance:
-		lookup(c.ribReadonly.Load())
-	}
-	return
 }

inlet/bmp/metrics.go

@@ -15,9 +15,10 @@ type metrics struct {
 	errors               *reporter.CounterVec
 	ignored              *reporter.CounterVec
 	panics               *reporter.CounterVec
-	ribCopies          *reporter.SummaryVec
+	locked               *reporter.SummaryVec
-	peerRemovalPartial *reporter.CounterVec
 	peerRemovalDone      *reporter.CounterVec
+	peerRemovalPartial   *reporter.CounterVec
+	peerRemovalQueueFull *reporter.CounterVec
 }
 
 // initMetrics initialize the metrics for the BMP component.
@@ -85,13 +86,13 @@ func (c *Component) initMetrics() {
 		},
 		[]string{"exporter"},
 	)
-	c.metrics.ribCopies = c.r.SummaryVec(
+	c.metrics.locked = c.r.SummaryVec(
 		reporter.SummaryOpts{
-			Name:       "rib_copies_total",
+			Name:       "locked_duration_seconds",
-			Help:       "Duration of RIB copies to read-only version.",
+			Help:       "Duration during which the RIB is locked.",
 			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
 		},
-		[]string{"timer"},
+		[]string{"reason"},
 	)
 	c.metrics.peerRemovalDone = c.r.CounterVec(
 		reporter.CounterOpts{
@@ -107,4 +108,11 @@ func (c *Component) initMetrics() {
 		},
 		[]string{"exporter"},
 	)
+	c.metrics.peerRemovalQueueFull = c.r.CounterVec(
+		reporter.CounterOpts{
+			Name: "peer_removal_queue_full_total",
+			Help: "Number of time the removal queue was full.",
+		},
+		[]string{"exporter"},
+	)
 }

inlet/bmp/remove.go

@@ -0,0 +1,56 @@
+// SPDX-FileCopyrightText: 2022 Free Mobile
+// SPDX-License-Identifier: AGPL-3.0-only
+
+package bmp
+
+import (
+	"context"
+	"time"
+)
+
+func (c *Component) peerRemovalWorker() error {
+	for {
+		select {
+		case <-c.t.Dying():
+			return nil
+		case pkey := <-c.peerRemovalChan:
+			exporterStr := pkey.exporter.Addr().Unmap().String()
+			for {
+				// Do one run of removal.
+				removed, done := func() (int, bool) {
+					ctx, cancel := context.WithTimeout(c.t.Context(context.Background()),
+						c.config.PeerRemovalMaxTime)
+					defer cancel()
+					start := c.d.Clock.Now()
+					c.mu.Lock()
+					defer func() {
+						c.mu.Unlock()
+						c.metrics.locked.WithLabelValues("peer-removal").Observe(
+							float64(c.d.Clock.Now().Sub(start).Nanoseconds()) / 1000 / 1000 / 1000)
+					}()
+					pinfo := c.peers[pkey]
+					removed, done := c.rib.flushPeer(ctx, pinfo.reference, c.config.PeerRemovalMinRoutes)
+					if done {
+						// Run was complete, remove the peer (we need the lock)
+						delete(c.peers, pkey)
+					}
+					return removed, done
+				}()
+				c.metrics.routes.WithLabelValues(exporterStr).Sub(float64(removed))
+				if done {
+					// Run was complete, update metrics
+					c.metrics.peers.WithLabelValues(exporterStr).Dec()
+					c.metrics.peerRemovalDone.WithLabelValues(exporterStr).Inc()
+					break
+				}
+				// Run is incompletem, update metrics and sleep a bit
+				c.metrics.peerRemovalPartial.WithLabelValues(exporterStr).Inc()
+				select {
+				case <-c.t.Dying():
+					return nil
+				case <-time.After(c.config.PeerRemovalSleepInterval):
+				}
+			}
+		}
+	}
+}

inlet/bmp/rib.go

@@ -169,19 +169,10 @@ func (r *rib) removePrefix(ip netip.Addr, bits int, old route) int {
 
 // flushPeer removes a whole peer from the RIB, returning the number
 // of removed routes.
-func (r *rib) flushPeer(peer uint32) int {
+func (r *rib) flushPeer(ctx context.Context, peer uint32, min int) (int, bool) {
-	removed, _ := r.flushPeerContext(nil, peer, 0)
+	// Handle context done state
-	return removed
+	done := atomic.Bool{}       // signal for the loop to stop when true
-}
+	stop := make(chan struct{}) // signal for the goroutine to stop
-
-// flushPeerContext removes a whole peer from the RIB, with a context returning
-// the number of removed routes and a bool to say if the operation was completed
-// before cancellation.
-func (r *rib) flushPeerContext(ctx context.Context, peer uint32, steps int) (int, bool) {
-	done := atomic.Bool{}
-	stop := make(chan struct{})
-	lastStep := 0
-	if ctx != nil {
 	defer close(stop)
 	go func() {
 		select {
@@ -191,7 +182,6 @@ func (r *rib) flushPeerContext(ctx context.Context, peer uint32, steps int) (int
 			done.Store(true)
 		}
 	}()
-	}
 
 	// Flush routes
 	removed := 0
@@ -208,10 +198,7 @@ func (r *rib) flushPeerContext(ctx context.Context, peer uint32, steps int) (int
 			}
 			return false
 		}, route{})
-		if ctx != nil && removed/steps > lastStep {
+		if removed >= min {
-			runtime.Gosched()
-			instrumentFlushPeer()
-			lastStep = removed / steps
 			if done.Load() {
 				return removed, false
 			}
@@ -220,18 +207,6 @@ func (r *rib) flushPeerContext(ctx context.Context, peer uint32, steps int) (int
 	return removed, true
 }
 
-var instrumentFlushPeer = func() {}
-
-// clone clone an existing RIB.
-func (r *rib) clone() *rib {
-	return &rib{
-		tree:     r.tree.Clone(),
-		nlris:    r.nlris.Clone(),
-		nextHops: r.nextHops.Clone(),
-		rtas:     r.rtas.Clone(),
-	}
-}
-
 // newRIB initializes a new RIB.
 func newRIB() *rib {
 	return &rib{

inlet/bmp/rib_test.go

@@ -4,6 +4,7 @@
 package bmp
 
 import (
+	"context"
 	"fmt"
 	"math/rand"
 	"net/netip"
@@ -294,7 +295,7 @@ func TestRIB(t *testing.T) {
 
 		// Remove everything
 		for _, peer := range peers {
-			r.flushPeer(peer)
+			r.flushPeer(context.Background(), peer, 100)
 		}
 
 		// Check for leak of interned values

inlet/bmp/root.go

@@ -8,7 +8,7 @@ package bmp
 import (
 	"fmt"
 	"net"
-	"sync/atomic"
+	"sync"
 	"time"
 
 	"github.com/benbjohnson/clock"
@@ -29,11 +29,13 @@ type Component struct {
 	address net.Addr
 	metrics metrics
 
-	// RIB management
+	// RIB management with peers
-	ribReadonly       atomic.Pointer[rib]
+	rib               *rib
-	ribWorkerChan     chan ribWorkerPayload
+	peers             map[peerKey]*peerInfo
-	ribWorkerPrioChan chan ribWorkerPayload
+	peerRemovalChan   chan peerKey
-	peerStaleTimer    *clock.Timer
+	lastPeerReference uint32
+	staleTimer        *clock.Timer
+	mu                sync.RWMutex
 }
 
 // Dependencies define the dependencies of the BMP component.
@@ -52,8 +54,9 @@ func New(r *reporter.Reporter, configuration Configuration, dependencies Depende
 		d:      &dependencies,
 		config: configuration,
 
-		ribWorkerChan:     make(chan ribWorkerPayload, 100),
+		rib:             newRIB(),
-		ribWorkerPrioChan: make(chan ribWorkerPayload, 100),
+		peers:           make(map[peerKey]*peerInfo),
+		peerRemovalChan: make(chan peerKey, configuration.PeerRemovalMaxQueue),
 	}
 	if len(c.config.RDs) > 0 {
 		c.acceptedRDs = make(map[uint64]struct{})
@@ -61,10 +64,7 @@ func New(r *reporter.Reporter, configuration Configuration, dependencies Depende
 			c.acceptedRDs[uint64(rd)] = struct{}{}
 		}
 	}
-	c.peerStaleTimer = c.d.Clock.AfterFunc(time.Hour, c.handleStalePeers)
+	c.staleTimer = c.d.Clock.AfterFunc(time.Hour, c.removeStalePeers)
-	if c.config.RIBMode == RIBModePerformance {
-		c.ribReadonly.Store(newRIB())
-	}
 
 	c.d.Daemon.Track(&c.t, "inlet/bmp")
 	c.initMetrics()
@@ -80,8 +80,8 @@ func (c *Component) Start() error {
 	}
 	c.address = listener.Addr()
 
-	// RIB worker
+	// Peer removal
-	c.t.Go(c.ribWorker)
+	c.t.Go(c.peerRemovalWorker)
 
 	// Listener
 	c.t.Go(func() error {
@@ -109,8 +109,7 @@ func (c *Component) Start() error {
 // Stop stops the BMP component
 func (c *Component) Stop() error {
 	defer func() {
-		close(c.ribWorkerChan)
+		close(c.peerRemovalChan)
-		close(c.ribWorkerPrioChan)
 		c.r.Info().Msg("BMP component stopped")
 	}()
 	c.r.Info().Msg("stopping BMP component")

inlet/bmp/root_test.go

@@ -8,6 +8,7 @@ import (
 	"net"
 	"net/netip"
 	"path"
+	"strconv"
 	"testing"
 	"time"
 
@@ -38,17 +39,18 @@ func TestBMP(t *testing.T) {
 	}
 	dumpRIB := func(t *testing.T, c *Component) map[netip.Addr][]string {
 		t.Helper()
+		c.mu.RLock()
+		defer c.mu.RUnlock()
 		result := map[netip.Addr][]string{}
-		c.ribWorkerQueue(func(s *ribWorkerState) error {
+		iter := c.rib.tree.Iterate()
-			iter := s.rib.tree.Iterate()
 		for iter.Next() {
 			addr := iter.Address()
 			for _, route := range iter.Tags() {
-					nlriRef := s.rib.nlris.Get(route.nlri)
+				nlriRef := c.rib.nlris.Get(route.nlri)
-					nh := s.rib.nextHops.Get(route.nextHop)
+				nh := c.rib.nextHops.Get(route.nextHop)
-					attrs := s.rib.rtas.Get(route.attributes)
+				attrs := c.rib.rtas.Get(route.attributes)
 				var peer netip.Addr
-					for pkey, pinfo := range s.peers {
+				for pkey, pinfo := range c.peers {
 					if pinfo.reference == route.peer {
 						peer = pkey.ip
 						break
@@ -67,8 +69,6 @@ func TestBMP(t *testing.T) {
 						attrs.communities, attrs.largeCommunities))
 			}
 		}
-			return nil
-		})
 		return result
 	}
 
@@ -295,8 +295,8 @@ func TestBMP(t *testing.T) {
 			`messages_received_total{exporter="127.0.0.1",type="statistics-report"}`:      "5",
 			`opened_connections_total{exporter="127.0.0.1"}`:                              "1",
 			`peers_total{exporter="127.0.0.1"}`:                                           "3",
-			`peer_removal_done_total{exporter="127.0.0.1"}`:                               "1",
 			`routes_total{exporter="127.0.0.1"}`:                                          "14",
+			`peer_removal_done_total{exporter="127.0.0.1"}`:                               "1",
 		}
 		if diff := helpers.Diff(gotMetrics, expectedMetrics); diff != "" {
 			t.Errorf("Metrics (-got, +want):\n%s", diff)
@@ -800,8 +800,8 @@ func TestBMP(t *testing.T) {
 			`opened_connections_total{exporter="127.0.0.1"}`:                            "1",
 			`closed_connections_total{exporter="127.0.0.1"}`:                            "1",
 			`peers_total{exporter="127.0.0.1"}`:                                         "0",
-			`peer_removal_done_total{exporter="127.0.0.1"}`:                             "1",
 			`routes_total{exporter="127.0.0.1"}`:                                        "0",
+			`peer_removal_done_total{exporter="127.0.0.1"}`:                             "1",
 		}
 		if diff := helpers.Diff(gotMetrics, expectedMetrics); diff != "" {
 			t.Errorf("Metrics (-got, +want):\n%s", diff)
@@ -908,8 +908,8 @@ func TestBMP(t *testing.T) {
 			`opened_connections_total{exporter="127.0.0.1"}`:                            "2",
 			`closed_connections_total{exporter="127.0.0.1"}`:                            "1",
 			`peers_total{exporter="127.0.0.1"}`:                                         "1",
-			`peer_removal_done_total{exporter="127.0.0.1"}`:                             "1",
 			`routes_total{exporter="127.0.0.1"}`:                                        "2",
+			`peer_removal_done_total{exporter="127.0.0.1"}`:                             "1",
 		}
 		if diff := helpers.Diff(gotMetrics, expectedMetrics); diff != "" {
 			t.Errorf("Metrics (-got, +want):\n%s", diff)
@@ -938,8 +938,8 @@ func TestBMP(t *testing.T) {
 			`opened_connections_total{exporter="127.0.0.1"}`:                            "2",
 			`closed_connections_total{exporter="127.0.0.1"}`:                            "2",
 			`peers_total{exporter="127.0.0.1"}`:                                         "1",
-			`peer_removal_done_total{exporter="127.0.0.1"}`:                             "1",
 			`routes_total{exporter="127.0.0.1"}`:                                        "2",
+			`peer_removal_done_total{exporter="127.0.0.1"}`:                             "1",
 		}
 		if diff := helpers.Diff(gotMetrics, expectedMetrics); diff != "" {
 			t.Errorf("Metrics (-got, +want):\n%s", diff)
@@ -961,8 +961,8 @@ func TestBMP(t *testing.T) {
 			`opened_connections_total{exporter="127.0.0.1"}`:                            "2",
 			`closed_connections_total{exporter="127.0.0.1"}`:                            "2",
 			`peers_total{exporter="127.0.0.1"}`:                                         "0",
-			`peer_removal_done_total{exporter="127.0.0.1"}`:                             "2",
 			`routes_total{exporter="127.0.0.1"}`:                                        "0",
+			`peer_removal_done_total{exporter="127.0.0.1"}`:                             "2",
 		}
 		if diff := helpers.Diff(gotMetrics, expectedMetrics); diff != "" {
 			t.Errorf("Metrics (-got, +want):\n%s", diff)
@@ -972,55 +972,40 @@ func TestBMP(t *testing.T) {
 		if diff := helpers.Diff(gotRIB, expectedRIB); diff != "" {
 			t.Errorf("RIB (-got, +want):\n%s", diff)
 		}
+
 	})
 
 	t.Run("init, peers up, eor, reach NLRI, conn down, immediate timeout", func(t *testing.T) {
 		r := reporter.NewMock(t)
 		config := DefaultConfiguration()
-		config.RIBPeerRemovalBatchRoutes = 1
+		config.PeerRemovalMaxTime = 1
+		config.PeerRemovalSleepInterval = 1
+		config.PeerRemovalMinRoutes = 1
 		c, mockClock := NewMock(t, r, config)
 		helpers.StartStop(t, c)
 		conn := dial(t, c)
 
-		pauseFlushPeer := make(chan bool)
-		instrumentFlushPeer = func() { <-pauseFlushPeer }
-		defer func() { instrumentFlushPeer = func() {} }()
-
 		send(t, conn, "bmp-init.pcap")
 		send(t, conn, "bmp-peers-up.pcap")
 		send(t, conn, "bmp-eor.pcap")
 		send(t, conn, "bmp-reach.pcap")
 		conn.Close()
-		time.Sleep(20 * time.Millisecond)
 		mockClock.Add(2 * time.Hour)
-
-		for i := 0; i < 5; i++ {
-			t.Logf("iteration %d", i)
-			// Sleep a bit to be sure flush is blocked
-			time.Sleep(10 * time.Millisecond)
-			done := make(chan bool)
-			go func() {
-				t.Logf("start lookup %d", i)
-				c.Lookup(net.ParseIP("2001:db8:1::10"), net.ParseIP("2001:db8::a"))
-				t.Logf("got lookup result %d", i)
-				close(done)
-			}()
-			// Sleep a bit to let some time to queue the request
-			time.Sleep(10 * time.Millisecond)
-			pauseFlushPeer <- false
-			// Wait for request to be completed
-			select {
-			case <-done:
-			case <-time.After(50 * time.Millisecond):
-				close(pauseFlushPeer)
-				t.Fatalf("no lookup answer")
-			}
-		}
-		// Process remaining requests
-		close(pauseFlushPeer)
 		time.Sleep(20 * time.Millisecond)
-
+		if helpers.RaceEnabled {
+			t.Skip("unreliable results when running with the race detector")
+		}
 		gotMetrics := r.GetMetrics("akvorado_inlet_bmp_", "-locked_duration")
+		// For peer_removal_partial_total, we have 18 routes, but only 14 routes
+		// can be removed while keeping 1 route on each peer. 14 is the max, but
+		// we rely on good-willing from the scheduler to get this number.
+		peerRemovalPartial, _ := strconv.Atoi(gotMetrics[`peer_removal_partial_total{exporter="127.0.0.1"}`])
+		if peerRemovalPartial > 14 {
+			t.Errorf("Metrics: peer_removal_partial_total %d > 14", peerRemovalPartial)
+		}
+		if peerRemovalPartial < 5 {
+			t.Errorf("Metrics: peer_removal_partial_total %d < 5", peerRemovalPartial)
+		}
 		expectedMetrics := map[string]string{
 			`messages_received_total{exporter="127.0.0.1",type="initiation"}`:           "1",
 			`messages_received_total{exporter="127.0.0.1",type="peer-up-notification"}`: "4",
@@ -1031,21 +1016,16 @@ func TestBMP(t *testing.T) {
 			`peers_total{exporter="127.0.0.1"}`:                                         "0",
 			`routes_total{exporter="127.0.0.1"}`:                                        "0",
 			`peer_removal_done_total{exporter="127.0.0.1"}`:                             "4",
-			`peer_removal_partial_total{exporter="127.0.0.1"}`:                          "5",
+			`peer_removal_partial_total{exporter="127.0.0.1"}`:                          fmt.Sprintf("%d", peerRemovalPartial),
 		}
 		if diff := helpers.Diff(gotMetrics, expectedMetrics); diff != "" {
 			t.Errorf("Metrics (-got, +want):\n%s", diff)
 		}
 	})
 
-	for _, mode := range []RIBMode{RIBModeMemory, RIBModePerformance} {
+	t.Run("lookup", func(t *testing.T) {
-		t.Run(fmt.Sprintf("lookup %s", mode), func(t *testing.T) {
 		r := reporter.NewMock(t)
 		config := DefaultConfiguration()
-			config.RIBMode = mode
-			config.RIBIdleUpdateDelay = 40 * time.Millisecond
-			config.RIBMinimumUpdateDelay = 300 * time.Millisecond
-			config.RIBMaximumUpdateDelay = 5 * time.Second
 		c, _ := NewMock(t, r, config)
 		helpers.StartStop(t, c)
 		conn := dial(t, c)
@@ -1054,55 +1034,30 @@ func TestBMP(t *testing.T) {
 		send(t, conn, "bmp-peers-up.pcap")
 		send(t, conn, "bmp-reach.pcap")
 		send(t, conn, "bmp-eor.pcap")
+		time.Sleep(20 * time.Millisecond)
 
-			for i := 0; i < 50; i++ {
 		lookup := c.Lookup(net.ParseIP("2001:db8:1::10"), net.ParseIP("2001:db8::a"))
 		if lookup.ASN != 174 {
-					if i == 99 {
 			t.Errorf("Lookup() == %d, expected 174", lookup.ASN)
 		}
-				} else {
-					break
-				}
-				time.Sleep(5 * time.Millisecond)
-			}
 
 		// Add another prefix
-			c.ribWorkerQueue(func(s *ribWorkerState) error {
+		c.rib.addPrefix(netip.MustParseAddr("2001:db8:1::"), 64, route{
-				s.rib.addPrefix(netip.MustParseAddr("2001:db8:1::"), 64, route{
 			peer:       1,
-					nlri:       s.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC}),
+			nlri:       c.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC}),
-					nextHop:    s.rib.nextHops.Put(nextHop(netip.MustParseAddr("2001:db8::a"))),
+			nextHop:    c.rib.nextHops.Put(nextHop(netip.MustParseAddr("2001:db8::a"))),
-					attributes: s.rib.rtas.Put(routeAttributes{asn: 176}),
+			attributes: c.rib.rtas.Put(routeAttributes{asn: 176}),
 		})
-				return nil
-			})
-			if mode == RIBModePerformance {
-				time.Sleep(100 * time.Millisecond) // < 300 ms but > 40 ms
-				// Despite that, we hit the minimum update delay
-				lookup := c.Lookup(net.ParseIP("2001:db8:1::10"), net.ParseIP("2001:db8::a"))
-				if lookup.ASN != 174 {
-					t.Errorf("Lookup() == %d, expected 174", lookup.ASN)
-				}
-			}
 
-			for i := 0; i < 100; i++ {
+		lookup = c.Lookup(net.ParseIP("2001:db8:1::10"), net.ParseIP("2001:db8::a"))
-				lookup := c.Lookup(net.ParseIP("2001:db8:1::10"), net.ParseIP("2001:db8::a"))
 		if lookup.ASN != 176 {
-					if i == 99 {
 			t.Errorf("Lookup() == %d, expected 176", lookup.ASN)
-					} else {
-						break
 		}
-					time.Sleep(5 * time.Millisecond)
+		lookup = c.Lookup(net.ParseIP("2001:db8:1::10"), net.ParseIP("2001:db8::b"))
-				}
-			}
-			lookup := c.Lookup(net.ParseIP("2001:db8:1::10"), net.ParseIP("2001:db8::b"))
 		if lookup.ASN != 174 {
 			t.Errorf("Lookup() == %d, expected 174", lookup.ASN)
 		}
 	})
-	}
 
 	t.Run("populate", func(t *testing.T) {
 		r := reporter.NewMock(t)

inlet/bmp/serve.go

@@ -61,7 +61,6 @@ func (c *Component) serveConnection(conn *net.TCPConn) error {
 
 	// Reading from connection
 	c.handleConnectionUp(exporter)
-	peerAddPathModes := map[peerKey]map[bgp.RouteFamily]bgp.BGPAddPathMode{}
 	init := false
 	header := make([]byte, bmp.BMP_HEADER_SIZE)
 	for {
@@ -139,9 +138,11 @@ func (c *Component) serveConnection(conn *net.TCPConn) error {
 			}
 			body = body[bmp.BMP_PEER_HEADER_SIZE:]
 			pkey = peerKeyFromBMPPeerHeader(exporter, &msg.PeerHeader)
-			if modes, ok := peerAddPathModes[pkey]; ok {
+			c.mu.RLock()
-				marshallingOptions = []*bgp.MarshallingOption{{AddPath: modes}}
+			if pinfo, ok := c.peers[pkey]; ok {
+				marshallingOptions = pinfo.marshallingOptions
 			}
+			c.mu.RUnlock()
 		}
 
 		if err := msg.Body.ParseBody(&msg, body, marshallingOptions...); err != nil {
@@ -201,44 +202,6 @@ func (c *Component) serveConnection(conn *net.TCPConn) error {
 			logger.Info().Msg("termination message received")
 			return nil
 		case *bmp.BMPPeerUpNotification:
-			// Check for ADD-PATH support.
-			receivedAddPath := map[bgp.RouteFamily]bgp.BGPAddPathMode{}
-			received, _ := body.ReceivedOpenMsg.Body.(*bgp.BGPOpen)
-			for _, param := range received.OptParams {
-				switch param := param.(type) {
-				case *bgp.OptionParameterCapability:
-					for _, cap := range param.Capability {
-						switch cap := cap.(type) {
-						case *bgp.CapAddPath:
-							for _, tuple := range cap.Tuples {
-								receivedAddPath[tuple.RouteFamily] = tuple.Mode
-							}
-						}
-					}
-				}
-			}
-			sent, _ := body.SentOpenMsg.Body.(*bgp.BGPOpen)
-			addPathOption := map[bgp.RouteFamily]bgp.BGPAddPathMode{}
-			for _, param := range sent.OptParams {
-				switch param := param.(type) {
-				case *bgp.OptionParameterCapability:
-					for _, cap := range param.Capability {
-						switch cap := cap.(type) {
-						case *bgp.CapAddPath:
-							for _, sent := range cap.Tuples {
-								receivedMode := receivedAddPath[sent.RouteFamily]
-								if receivedMode == bgp.BGP_ADD_PATH_BOTH || receivedMode == bgp.BGP_ADD_PATH_SEND {
-									if sent.Mode == bgp.BGP_ADD_PATH_BOTH || sent.Mode == bgp.BGP_ADD_PATH_RECEIVE {
-										// We have at least the receive mode. We only do decoding.
-										addPathOption[sent.RouteFamily] = bgp.BGP_ADD_PATH_RECEIVE
-									}
-								}
-							}
-						}
-					}
-				}
-			}
-			peerAddPathModes[pkey] = addPathOption
 			c.handlePeerUpNotification(pkey, body)
 		case *bmp.BMPPeerDownNotification:
 			c.handlePeerDownNotification(pkey)

inlet/bmp/tests.go

@@ -37,54 +37,51 @@ func NewMock(t *testing.T, r *reporter.Reporter, conf Configuration) (*Component
 // PopulateRIB populates the RIB with a few entries.
 func (c *Component) PopulateRIB(t *testing.T) {
 	t.Helper()
-	c.ribWorkerQueue(func(s *ribWorkerState) error {
+	pinfo := c.addPeer(peerKey{
-		pinfo := c.addPeer(s, peerKey{
 		exporter: netip.MustParseAddrPort("[::ffff:127.0.0.1]:47389"),
 		ip:       netip.MustParseAddr("::ffff:203.0.113.4"),
 		ptype:    bmp.BMP_PEER_TYPE_GLOBAL,
 		asn:      64500,
 	})
-		s.rib.addPrefix(netip.MustParseAddr("::ffff:192.0.2.0"), 96+27, route{
+	c.rib.addPrefix(netip.MustParseAddr("::ffff:192.0.2.0"), 96+27, route{
 		peer:    pinfo.reference,
-			nlri:    s.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC, path: 1}),
+		nlri:    c.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC, path: 1}),
-			nextHop: s.rib.nextHops.Put(nextHop(netip.MustParseAddr("::ffff:198.51.100.4"))),
+		nextHop: c.rib.nextHops.Put(nextHop(netip.MustParseAddr("::ffff:198.51.100.4"))),
-			attributes: s.rib.rtas.Put(routeAttributes{
+		attributes: c.rib.rtas.Put(routeAttributes{
 			asn:              174,
 			asPath:           []uint32{64200, 1299, 174},
 			communities:      []uint32{100, 200, 400},
 			largeCommunities: []bgp.LargeCommunity{{ASN: 64200, LocalData1: 2, LocalData2: 3}},
 		}),
 	})
-		s.rib.addPrefix(netip.MustParseAddr("::ffff:192.0.2.0"), 96+27, route{
+	c.rib.addPrefix(netip.MustParseAddr("::ffff:192.0.2.0"), 96+27, route{
 		peer:    pinfo.reference,
-			nlri:    s.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC, path: 2}),
+		nlri:    c.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC, path: 2}),
-			nextHop: s.rib.nextHops.Put(nextHop(netip.MustParseAddr("::ffff:198.51.100.8"))),
+		nextHop: c.rib.nextHops.Put(nextHop(netip.MustParseAddr("::ffff:198.51.100.8"))),
-			attributes: s.rib.rtas.Put(routeAttributes{
+		attributes: c.rib.rtas.Put(routeAttributes{
 			asn:         174,
 			asPath:      []uint32{64200, 174, 174, 174},
 			communities: []uint32{100},
 		}),
 	})
-		s.rib.addPrefix(netip.MustParseAddr("::ffff:192.0.2.128"), 96+27, route{
+	c.rib.addPrefix(netip.MustParseAddr("::ffff:192.0.2.128"), 96+27, route{
 		peer:    pinfo.reference,
-			nlri:    s.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC}),
+		nlri:    c.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC}),
-			nextHop: s.rib.nextHops.Put(nextHop(netip.MustParseAddr("::ffff:198.51.100.8"))),
+		nextHop: c.rib.nextHops.Put(nextHop(netip.MustParseAddr("::ffff:198.51.100.8"))),
-			attributes: s.rib.rtas.Put(routeAttributes{
+		attributes: c.rib.rtas.Put(routeAttributes{
 			asn:         1299,
 			asPath:      []uint32{64200, 1299},
 			communities: []uint32{500},
 		}),
 	})
-		s.rib.addPrefix(netip.MustParseAddr("::ffff:1.0.0.0"), 96+24, route{
+	c.rib.addPrefix(netip.MustParseAddr("::ffff:1.0.0.0"), 96+24, route{
 		peer:    pinfo.reference,
-			nlri:    s.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC}),
+		nlri:    c.rib.nlris.Put(nlri{family: bgp.RF_FS_IPv4_UC}),
-			nextHop: s.rib.nextHops.Put(nextHop(netip.MustParseAddr("::ffff:198.51.100.8"))),
+		nextHop: c.rib.nextHops.Put(nextHop(netip.MustParseAddr("::ffff:198.51.100.8"))),
-			attributes: s.rib.rtas.Put(routeAttributes{
+		attributes: c.rib.rtas.Put(routeAttributes{
 			asn: 65300,
 		}),
 	})
-		return nil
-	})
 }
 
 // LocalAddr returns the address the BMP collector is listening to.

inlet/core/enricher_test.go

@@ -351,7 +351,6 @@ ClassifyProviderRegex(Interface.Description, "^Transit: ([^ ]+)", "$1")`,
 			kafkaComponent, kafkaProducer := kafka.NewMock(t, r, kafka.DefaultConfiguration())
 			httpComponent := http.NewMock(t, r)
 			bmpComponent, _ := bmp.NewMock(t, r, bmp.DefaultConfiguration())
-			helpers.StartStop(t, bmpComponent)
 			bmpComponent.PopulateRIB(t)
 
 			// Prepare a configuration
@@ -460,8 +459,6 @@ func TestGetASNumber(t *testing.T) {
 			configuration := DefaultConfiguration()
 			configuration.ASNProviders = tc.Providers
 			bmpComponent, _ := bmp.NewMock(t, r, bmp.DefaultConfiguration())
-			bmpComponent.Start()
-			defer bmpComponent.Stop()
 			bmpComponent.PopulateRIB(t)
 
 			c, err := New(r, configuration, Dependencies{

inlet/core/root_test.go

@@ -42,7 +42,6 @@ func TestCore(t *testing.T) {
 	kafkaComponent, kafkaProducer := kafka.NewMock(t, r, kafka.DefaultConfiguration())
 	httpComponent := http.NewMock(t, r)
 	bmpComponent, _ := bmp.NewMock(t, r, bmp.DefaultConfiguration())
-	helpers.StartStop(t, bmpComponent)
 	bmpComponent.PopulateRIB(t)
 
 	// Instantiate and start core