Stack backoff rework (#83)

* huge Stack backoff rework

* lneto bump: huge Stack backoff rework

examples/berkeley-listener/berkeley_server.go

@@ -199,7 +199,7 @@ func run() error {
 	}()
 
 	// Create blocking + Berkeley stack
-	blocking := stack.StackBlocking(5 * time.Millisecond)
+	blocking := stack.StackBlocking(stackBackoff)
 	berkeley := blocking.StackGo(xnet.StackGoConfig{
 		ListenerPoolConfig: xnet.TCPPoolConfig{
 			PoolSize:           uint16(flagPoolSize),
@@ -212,7 +212,7 @@ func run() error {
 	})
 
 	// Perform DHCP to get address.
-	rstack := stack.StackRetrying(5 * time.Millisecond)
+	rstack := stack.StackRetrying(stackBackoff)
 	const dhcpTimeout = 6 * time.Second
 	const dhcpRetries = 2
 	results, err := rstack.DoDHCPv4([4]byte{192, 168, 1, 96}, dhcpTimeout, dhcpRetries)
@@ -399,3 +399,10 @@ func mockClient(stack *xnet.StackAsync, port uint16, subnet netip.Prefix) {
 	fmt.Println("mockclient: received response:\n", string(page))
 	mockConn.Close()
 }
+
+func stackBackoff(consecutiveBackoffs uint) time.Duration {
+	if consecutiveBackoffs < 10 {
+		return time.Millisecond
+	}
+	return 10 * time.Millisecond
+}

examples/httpserver/main.go

@@ -190,7 +190,7 @@ func run() (err error) {
 		}
 	}()
 
-	rstack := stack.StackRetrying(5 * time.Millisecond)
+	rstack := stack.StackRetrying(stackBackoff)
 
 	const (
 		dhcpTimeout = 6 * time.Second
@@ -354,3 +354,10 @@ func tryPoll(iface ltesto.Interface, poll time.Duration) (dataMayBeReady bool, _
 	dataMayBeReady = true
 	return dataMayBeReady, nil
 }
+
+func stackBackoff(consecutiveBackoffs uint) time.Duration {
+	if consecutiveBackoffs < 10 {
+		return time.Millisecond
+	}
+	return 10 * time.Millisecond
+}

examples/min-working-example/main-mwe.go

@@ -79,7 +79,7 @@ func run(ctx context.Context, stack *xnet.StackAsync) error {
 	// Other option is to instead use async API which leads to more verbose
 	// and more stateful code.
 	go stackLoop(ctx, stack)
-	rstack := stack.StackRetrying(pollTime)
+	rstack := stack.StackRetrying(stackBackoff)
 	results, err := rstack.DoDHCPv4([4]byte{}, protoTimeout, protoRetries)
 	if err != nil {
 		return fmt.Errorf("doing DHCP: %w", err)
@@ -93,7 +93,7 @@ func run(ctx context.Context, stack *xnet.StackAsync) error {
 		return fmt.Errorf("resolving router MAC: %w", err)
 	}
 	stack.SetGateway6(gateway)
-	berkstack := stack.StackBlocking(pollTime).StackGo(xnet.StackGoConfig{
+	berkstack := stack.StackBlocking(stackBackoff).StackGo(xnet.StackGoConfig{
 		ListenerPoolConfig: xnet.TCPPoolConfig{
 			PoolSize:           tcpConnPoolSize,
 			QueueSize:          tcpPacketQueueSize,
@@ -171,3 +171,10 @@ func must(err error) {
 		panic(err)
 	}
 }
+
+func stackBackoff(consecutiveBackoffs uint) time.Duration {
+	if consecutiveBackoffs < 10 {
+		return time.Millisecond
+	}
+	return 10 * time.Millisecond
+}

examples/xcurl/main.go

@@ -212,7 +212,7 @@ func run() (err error) {
 		}
 	}()
 
-	rstack := stack.StackRetrying(5 * time.Millisecond)
+	rstack := stack.StackRetrying(stackBackoff)
 
 	const (
 		dhcpTimeout = 6 * time.Second
@@ -382,3 +382,10 @@ func tryPoll(iface ltesto.Interface, poll time.Duration) (dataMayBeReady bool, _
 	dataMayBeReady = true
 	return dataMayBeReady, nil
 }
+
+func stackBackoff(consecutiveBackoffs uint) time.Duration {
+	if consecutiveBackoffs < 10 {
+		return time.Millisecond
+	}
+	return 10 * time.Millisecond
+}