/
bpf.go
135 lines (123 loc) · 3.69 KB
/
bpf.go
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package monitoring
import (
"fmt"
"github.com/cilium/ebpf"
"github.com/go-logr/logr"
"github.com/prometheus/client_golang/prometheus"
"github.com/telekom/das-schiff-network-operator/pkg/bpf"
ctrl "sigs.k8s.io/controller-runtime"
)
type bpfCollector struct {
returnReasonsPacketsDesc typedFactoryDesc
returnReasonsBytesDesc typedFactoryDesc
fibLookupPacketsDesc typedFactoryDesc
fibLookupBytesDesc typedFactoryDesc
logger logr.Logger
}
type statsRecord struct {
RXPackets uint64
RXBytes uint64
}
var (
epbfReturnReasons = []string{
"route", "route_noneigh", "err_parse_headers", "not_fwd", "err_store_mac", "err_buffer_size", "err_fallthrough",
}
ebpfFibLookupResult = []string{
"success", "blackhole", "unreacheable", "prohibit", "not_fwded", "fwd_disabled", "unsupp_lwt", "no_neigh", "frag_needed",
}
)
func init() {
registerCollector("bpf", defaultEnabled, NewBPFCollector)
}
func NewBPFCollector() (Collector, error) {
collector := bpfCollector{
returnReasonsPacketsDesc: typedFactoryDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "bpf", "return_reasons_packets"),
"The BPF tc_router program return reasons",
[]string{"key"},
nil,
),
valueType: prometheus.CounterValue,
},
returnReasonsBytesDesc: typedFactoryDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "bpf", "return_reasons_bytes"),
"The BPF tc_router program return reasons",
[]string{"key"},
nil,
),
valueType: prometheus.CounterValue,
},
fibLookupPacketsDesc: typedFactoryDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "bpf", "fib_lookup_packets"),
"The BPF tc_router program lookup results",
[]string{"key"},
nil,
),
valueType: prometheus.CounterValue,
},
fibLookupBytesDesc: typedFactoryDesc{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "bpf", "fib_lookup_bytes"),
"The BPF tc_router program lookup results",
[]string{"key"},
nil,
),
valueType: prometheus.CounterValue,
},
logger: ctrl.Log.WithName("bpf.collector"),
}
return &collector, nil
}
func (*bpfCollector) fetchEbpfStatistics(m *ebpf.Map, key uint32) (*statsRecord, error) {
var perCPUStats []*statsRecord
err := m.Lookup(key, &perCPUStats)
if err != nil {
return nil, fmt.Errorf("error looking up bpf key: %w", err)
}
var aggregatedStats statsRecord
for _, stat := range perCPUStats {
aggregatedStats.RXBytes += stat.RXBytes
aggregatedStats.RXPackets += stat.RXPackets
}
return &aggregatedStats, nil
}
func (c *bpfCollector) updateReturnReasons(ch chan<- prometheus.Metric) error {
if bpf.EbpfRetStatsMap() == nil {
return ErrNoData
}
for idx, name := range epbfReturnReasons {
stats, err := c.fetchEbpfStatistics(bpf.EbpfRetStatsMap(), uint32(idx))
if err != nil {
return err
}
ch <- c.returnReasonsPacketsDesc.mustNewConstMetric(float64(stats.RXPackets), name)
ch <- c.returnReasonsBytesDesc.mustNewConstMetric(float64(stats.RXBytes), name)
}
return nil
}
func (c *bpfCollector) updateFibLookupResults(ch chan<- prometheus.Metric) error {
if bpf.EbpfFibLkupStatsMap() == nil {
return ErrNoData
}
for idx, name := range ebpfFibLookupResult {
stats, err := c.fetchEbpfStatistics(bpf.EbpfFibLkupStatsMap(), uint32(idx))
if err != nil {
return err
}
ch <- c.fibLookupPacketsDesc.mustNewConstMetric(float64(stats.RXPackets), name)
ch <- c.fibLookupBytesDesc.mustNewConstMetric(float64(stats.RXBytes), name)
}
return nil
}
func (c *bpfCollector) Update(ch chan<- prometheus.Metric) error {
if err := c.updateReturnReasons(ch); err != nil {
return err
}
if err := c.updateFibLookupResults(ch); err != nil {
return err
}
return nil
}