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Merged
mayankpande88 merged 1 commit into from
Feb 12, 2026
Merged

⚡ Bolt: Optimize eBPF event parsing by replacing binary.Read #196

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192 changes: 121 additions & 71 deletions ebpftracer/tracer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,14 @@ import (
"k8s.io/klog/v2"
)

const MaxPayloadSize = 8192 // Must match MAX_PAYLOAD_SIZE in eBPF
const (
MaxPayloadSize = 8192 // Must match MAX_PAYLOAD_SIZE in eBPF

l7EventHeaderSize = 96 // 56 bytes base + 40 bytes socket tuple fields
tcpEventSize = 104
fileEventSize = 32
procEventSize = 12
)

type EventType uint32
type EventReason uint32
Expand Down Expand Up @@ -468,78 +475,95 @@ func runEventsReader(name string, r *perf.Reader, ch chan<- Event, typ perfMapTy

switch typ {
case perfMapTypeL7Events:
v := &l7Event{}
data := rec.RawSample

if err := binary.Read(bytes.NewBuffer(data), binary.LittleEndian, v); err != nil {
klog.Warningln("failed to read l7 event:", err)
if len(data) < l7EventHeaderSize {
klog.Warningln("invalid l7 event size:", len(data))
continue
}
payloadSize := binary.LittleEndian.Uint64(data[40:48])
responseSize := binary.LittleEndian.Uint64(data[48:56])
payloadLen := int(payloadSize)
if payloadLen > MaxPayloadSize {
payloadLen = MaxPayloadSize
}
responseLen := int(responseSize)
if responseLen > MaxPayloadSize {
responseLen = MaxPayloadSize
}

// Extract payload data directly from the struct arrays
payloadSize := min(int(v.PayloadSize), len(v.Payload))
responseSize := min(int(v.ResponseSize), len(v.Response))

// Copy the actual data (preventing garbage from unused buffer space)
payloadData := make([]byte, payloadSize)
copy(payloadData, v.Payload[:payloadSize])
payloadData := make([]byte, payloadLen)
if l7EventHeaderSize+payloadLen <= len(data) {
copy(payloadData, data[l7EventHeaderSize:l7EventHeaderSize+payloadLen])
}

responseData := make([]byte, responseSize)
copy(responseData, v.Response[:responseSize])
responseData := make([]byte, responseLen)
respOffset := l7EventHeaderSize + MaxPayloadSize
if respOffset+responseLen <= len(data) {
copy(responseData, data[respOffset:respOffset+responseLen])
}

req := &l7.RequestData{
Protocol: l7.Protocol(v.Protocol),
Status: l7.Status(v.Status),
Duration: time.Duration(v.Duration),
Method: l7.Method(v.Method),
StatementId: v.StatementId,
PayloadSize: v.PayloadSize,
ResponseSize: v.ResponseSize,
Protocol: l7.Protocol(data[32]),
Method: l7.Method(data[33]),
Status: l7.Status(int32(binary.LittleEndian.Uint32(data[20:24]))),
Duration: time.Duration(binary.LittleEndian.Uint64(data[24:32])),
StatementId: binary.LittleEndian.Uint32(data[36:40]),
PayloadSize: payloadSize,
ResponseSize: responseSize,
Payload: payloadData,
Response: responseData,
}

event = Event{
Type: EventTypeL7Request,
Pid: v.Pid,
Fd: v.Fd,
Timestamp: v.ConnectionTimestamp,
Pid: binary.LittleEndian.Uint32(data[16:20]),
Fd: binary.LittleEndian.Uint64(data[0:8]),
Timestamp: binary.LittleEndian.Uint64(data[8:16]),
L7Request: req,
}
case perfMapTypeFileEvents:
v := &fileEvent{}
if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
klog.Warningln("failed to read file event:", err)
if len(rec.RawSample) < fileEventSize {
klog.Warningln("invalid file event size:", len(rec.RawSample))
continue
}
event = Event{Type: v.Type, Pid: v.Pid, Fd: v.Fd, Mnt: v.Mnt, Log: v.Log > 0}
event = Event{
Type: EventType(binary.LittleEndian.Uint32(rec.RawSample[0:4])),
Pid: binary.LittleEndian.Uint32(rec.RawSample[4:8]),
Fd: binary.LittleEndian.Uint64(rec.RawSample[8:16]),
Mnt: binary.LittleEndian.Uint64(rec.RawSample[16:24]),
Log: binary.LittleEndian.Uint64(rec.RawSample[24:32]) > 0,
}
case perfMapTypeProcEvents:
v := &procEvent{}
if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
klog.Warningln("failed to read proc event:", err)
if len(rec.RawSample) < procEventSize {
klog.Warningln("invalid proc event size:", len(rec.RawSample))
continue
}
event = Event{Type: v.Type, Reason: EventReason(v.Reason), Pid: v.Pid}
event = Event{
Type: EventType(binary.LittleEndian.Uint32(rec.RawSample[0:4])),
Pid: binary.LittleEndian.Uint32(rec.RawSample[4:8]),
Reason: EventReason(binary.LittleEndian.Uint32(rec.RawSample[8:12])),
}
case perfMapTypeTCPEvents:
v := &tcpEvent{}
if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
klog.Warningln("failed to read tcp event:", err)
if len(rec.RawSample) < tcpEventSize {
klog.Warningln("invalid tcp event size:", len(rec.RawSample))
continue
}
data := rec.RawSample
typ := EventType(binary.LittleEndian.Uint32(data[24:28]))
event = Event{
Type: v.Type,
Pid: v.Pid,
SrcAddr: ipPort(v.SAddr, v.SPort),
DstAddr: ipPort(v.DAddr, v.DPort),
ActualDstAddr: ipPort(v.AAddr, v.Aport),
Fd: v.Fd,
Timestamp: v.Timestamp,
Duration: time.Duration(v.Duration),
Type: typ,
Pid: binary.LittleEndian.Uint32(data[28:32]),
SrcAddr: ipPort(data[54:70], binary.LittleEndian.Uint16(data[48:50])),
DstAddr: ipPort(data[70:86], binary.LittleEndian.Uint16(data[50:52])),
ActualDstAddr: ipPort(data[86:102], binary.LittleEndian.Uint16(data[52:54])),
Fd: binary.LittleEndian.Uint64(data[0:8]),
Timestamp: binary.LittleEndian.Uint64(data[8:16]),
Duration: time.Duration(binary.LittleEndian.Uint64(data[16:24])),
}
if v.Type == EventTypeConnectionClose {
if typ == EventTypeConnectionClose {
event.TrafficStats = &TrafficStats{
BytesSent: v.BytesSent,
BytesReceived: v.BytesReceived,
BytesSent: binary.LittleEndian.Uint64(data[32:40]),
BytesReceived: binary.LittleEndian.Uint64(data[40:48]),
}
}
default:
Expand All @@ -565,43 +589,69 @@ func runRingbufEventsReader(name string, r *ringbuf.Reader, ch chan<- Event) {
continue
}

v := &l7Event{}
if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
klog.Warningln("failed to read l7 event from ring buffer:", err)
data := rec.RawSample
if len(data) < l7EventHeaderSize {
klog.Warningln("invalid l7 event from ring buffer, size:", len(data))
continue
}

// Extract payload data directly from the struct arrays
payloadSize := min(int(v.PayloadSize), len(v.Payload))
responseSize := min(int(v.ResponseSize), len(v.Response))
payloadSize := binary.LittleEndian.Uint64(data[40:48])
responseSize := binary.LittleEndian.Uint64(data[48:56])

payloadLen := int(payloadSize)
if payloadLen > MaxPayloadSize {
payloadLen = MaxPayloadSize
}
responseLen := int(responseSize)
if responseLen > MaxPayloadSize {
responseLen = MaxPayloadSize
}

// Copy the actual data (preventing garbage from unused buffer space)
payloadData := make([]byte, payloadSize)
copy(payloadData, v.Payload[:payloadSize])
payloadData := make([]byte, payloadLen)
if l7EventHeaderSize+payloadLen <= len(data) {
copy(payloadData, data[l7EventHeaderSize:l7EventHeaderSize+payloadLen])
}

responseData := make([]byte, responseSize)
copy(responseData, v.Response[:responseSize])
responseData := make([]byte, responseLen)
respOffset := l7EventHeaderSize + MaxPayloadSize
if respOffset+responseLen <= len(data) {
copy(responseData, data[respOffset:respOffset+responseLen])
}

req := &l7.RequestData{
Protocol: l7.Protocol(v.Protocol),
Status: l7.Status(v.Status),
Duration: time.Duration(v.Duration),
Method: l7.Method(v.Method),
StatementId: v.StatementId,
PayloadSize: v.PayloadSize,
ResponseSize: v.ResponseSize,
Protocol: l7.Protocol(data[32]),
Method: l7.Method(data[33]),
Status: l7.Status(int32(binary.LittleEndian.Uint32(data[20:24]))),
Duration: time.Duration(binary.LittleEndian.Uint64(data[24:32])),
StatementId: binary.LittleEndian.Uint32(data[36:40]),
PayloadSize: payloadSize,
ResponseSize: responseSize,
Payload: payloadData,
Response: responseData,
}

// Extract socket info from L7 event (enables processing without TCP connection tracking)
socketInfo := GetSocketInfoFromL7Event(v)
// Extract socket info from raw bytes
var socketInfo *SocketInfo
if data[94] != 0 { // SocketInfoValid at offset 94
var saddr, daddr [16]byte
copy(saddr[:], data[56:72])
copy(daddr[:], data[72:88])
addrFamily := binary.LittleEndian.Uint16(data[92:94])
socketInfo = &SocketInfo{
SrcIP: extractIPFromSocketInfo(saddr, addrFamily),
DstIP: extractIPFromSocketInfo(daddr, addrFamily),
SrcPort: binary.LittleEndian.Uint16(data[88:90]),
DstPort: binary.LittleEndian.Uint16(data[90:92]),
Family: addrFamily,
Valid: true,
}
}

event := Event{
Type: EventTypeL7Request,
Pid: v.Pid,
Fd: v.Fd,
Timestamp: v.ConnectionTimestamp,
Pid: binary.LittleEndian.Uint32(data[16:20]),
Fd: binary.LittleEndian.Uint64(data[0:8]),
Timestamp: binary.LittleEndian.Uint64(data[8:16]),
L7Request: req,
SocketInfo: socketInfo,
}
Expand All @@ -610,8 +660,8 @@ func runRingbufEventsReader(name string, r *ringbuf.Reader, ch chan<- Event) {
}
}

func ipPort(ip [16]byte, port uint16) netaddr.IPPort {
i, _ := netaddr.FromStdIP(ip[:])
func ipPort(ip []byte, port uint16) netaddr.IPPort {
i, _ := netaddr.FromStdIP(ip)
return netaddr.IPPortFrom(i, port)
}

Expand Down