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tracenetiftxlatency.go
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tracenetiftxlatency.go
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package tracenetif
import (
"bytes"
"context"
"encoding/binary"
"errors"
"fmt"
"log"
"math/bits"
"sync"
"unsafe"
"github.com/alibaba/kubeskoop/pkg/exporter/bpfutil"
"github.com/alibaba/kubeskoop/pkg/exporter/nettop"
"github.com/alibaba/kubeskoop/pkg/exporter/proto"
"github.com/cilium/ebpf"
"github.com/cilium/ebpf/link"
"github.com/cilium/ebpf/perf"
"github.com/cilium/ebpf/ringbuf"
"github.com/cilium/ebpf/rlimit"
"golang.org/x/exp/slog"
)
// nolint
//
//go:generate go run github.com/cilium/ebpf/cmd/bpf2go -cc clang -cflags $BPF_CFLAGS -type insp_nftxlat_event_t -type insp_nftxlat_metric_t bpf ../../../../bpf/netiftxlatency.c -- -I../../../../bpf/headers -D__TARGET_ARCH_x86
const (
TXLAT_QDISC_SLOW = "netiftxlat_qdiscslow100ms"
TXLAT_NETDEV_SLOW = "netiftxlat_netdevslow100ms"
)
var (
MODULE_NAME = "insp_netiftxlat" // nolint
probe = &NetifTxlatencyProbe{once: sync.Once{}}
links = []link.Link{}
events = []string{"TXLAT_QDISC_100MS", "TXLAT_NETDEV_100MS"}
metrics = []string{TXLAT_QDISC_SLOW, TXLAT_NETDEV_SLOW}
metricsMap = map[string]map[uint32]uint64{}
perfReader *perf.Reader
)
func GetProbe() *NetifTxlatencyProbe {
return probe
}
func init() {
for m := range metrics {
metricsMap[metrics[m]] = map[uint32]uint64{}
}
}
type NetifTxlatencyProbe struct {
enable bool
once sync.Once
sub chan<- proto.RawEvent
mtx sync.Mutex
}
func (p *NetifTxlatencyProbe) Name() string {
return MODULE_NAME
}
func (p *NetifTxlatencyProbe) Start(ctx context.Context) {
// 将eBPF程序进行link
p.once.Do(func() {
err := start()
if err != nil {
slog.Ctx(ctx).Warn("start", "module", MODULE_NAME, "err", err)
return
}
p.enable = true
})
slog.Debug("start probe", "module", MODULE_NAME)
if perfReader == nil {
slog.Ctx(ctx).Warn("start", "module", MODULE_NAME, "err", "perf reader not ready")
return
}
// 开始针对perf事件进行读取
for {
record, err := perfReader.Read()
if err != nil {
if errors.Is(err, ringbuf.ErrClosed) {
slog.Ctx(ctx).Info("received signal, exiting..", "module", MODULE_NAME)
return
}
slog.Ctx(ctx).Info("reading from reader", "module", MODULE_NAME, "err", err)
continue
}
if record.LostSamples != 0 {
slog.Ctx(ctx).Info("Perf event ring buffer full", "module", MODULE_NAME, "drop samples", record.LostSamples)
continue
}
// 解析perf事件信息,输出为proto.RawEvent
var event bpfInspNftxlatEventT
// Parse the ringbuf event entry into a bpfEvent structure.
if err := binary.Read(bytes.NewBuffer(record.RawSample), binary.LittleEndian, &event); err != nil {
slog.Ctx(ctx).Info("parsing event", "module", MODULE_NAME, "err", err)
continue
}
rawevt := proto.RawEvent{
Netns: event.SkbMeta.Netns,
}
tuple := fmt.Sprintf("protocol=%s saddr=%s sport=%d daddr=%s dport=%d ", bpfutil.GetProtoStr(event.Tuple.L4Proto), bpfutil.GetAddrStr(event.Tuple.L3Proto, *(*[16]byte)(unsafe.Pointer(&event.Tuple.Saddr))), bits.ReverseBytes16(event.Tuple.Sport), bpfutil.GetAddrStr(event.Tuple.L3Proto, *(*[16]byte)(unsafe.Pointer(&event.Tuple.Daddr))), bits.ReverseBytes16(event.Tuple.Dport))
rawevt.EventBody = fmt.Sprintf("%s latency:%s", tuple, bpfutil.GetHumanTimes(event.Latency))
/*#define THRESH
#define ACTION_QDISC 1
#define ACTION_XMIT 2
*/
if event.Type == 1 {
rawevt.EventType = "NETIFTXLAT_QDISC"
p.updateMetrics(rawevt.Netns, TXLAT_QDISC_SLOW)
} else if event.Type == 2 {
rawevt.EventType = "NETIFTXLAT_XMIT"
p.updateMetrics(rawevt.Netns, TXLAT_NETDEV_SLOW)
}
// 分发给注册的dispatcher,其余逻辑由框架完成
if p.sub != nil {
slog.Ctx(ctx).Debug("broadcast event", "module", MODULE_NAME)
p.sub <- rawevt
}
}
}
// Register register sub chan to get perf events
func (p *NetifTxlatencyProbe) Register(receiver chan<- proto.RawEvent) error {
p.mtx.Lock()
defer p.mtx.Unlock()
p.sub = receiver
return nil
}
func (p *NetifTxlatencyProbe) Ready() bool {
return p.enable
}
func (p *NetifTxlatencyProbe) Close() error {
if p.enable {
for _, link := range links {
link.Close()
}
links = []link.Link{}
}
if perfReader != nil {
perfReader.Close()
perfReader = nil
}
return nil
}
func (p *NetifTxlatencyProbe) updateMetrics(netns uint32, metric string) {
p.mtx.Lock()
defer p.mtx.Unlock()
if _, ok := metricsMap[metric]; ok {
metricsMap[metric][netns]++
}
}
func (p *NetifTxlatencyProbe) GetEventNames() []string {
return events
}
func (p *NetifTxlatencyProbe) GetMetricNames() []string {
return metrics
}
func (p *NetifTxlatencyProbe) Collect(_ context.Context) (map[string]map[uint32]uint64, error) {
ets := nettop.GetAllEntity()
resMap := map[string]map[uint32]uint64{}
for metric, v := range metricsMap {
resMap[metric] = make(map[uint32]uint64)
for _, et := range ets {
if et != nil {
nsinum := et.GetNetns()
if v, ok := v[uint32(nsinum)]; ok {
resMap[metric][uint32(nsinum)] = v
} else {
// if no kernel latency event recorded, set value to 0
resMap[metric][uint32(nsinum)] = 0
}
}
}
}
return resMap, nil
}
func start() error {
// 准备动作
if err := rlimit.RemoveMemlock(); err != nil {
log.Fatal(err)
}
opts := ebpf.CollectionOptions{}
// 获取btf信息
opts.Programs = ebpf.ProgramOptions{
KernelTypes: bpfutil.LoadBTFSpecOrNil(),
}
// 获取Loaded的程序/map的fd信息
objs := bpfObjects{}
if err := loadBpfObjects(&objs, &opts); err != nil {
return fmt.Errorf("loading objects: %v", err)
}
// 执行link操作,保存rawfd
progQueue, err := link.Tracepoint("net", "net_dev_queue", objs.NetDevQueue, &link.TracepointOptions{})
if err != nil {
return err
}
links = append(links, progQueue)
progStart, err := link.Tracepoint("net", "net_dev_start_xmit", objs.NetDevStartXmit, &link.TracepointOptions{})
if err != nil {
return err
}
links = append(links, progStart)
progXmit, err := link.Tracepoint("net", "net_dev_xmit", objs.NetDevXmit, &link.TracepointOptions{})
if err != nil {
return err
}
links = append(links, progXmit)
// 初始化map的读接口
reader, err := perf.NewReader(objs.bpfMaps.InspSklatEvent, int(unsafe.Sizeof(bpfInspNftxlatEventT{})))
if err != nil {
return err
}
perfReader = reader
return nil
}