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eventsmap.go
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eventsmap.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2020 Authors of Cilium
package eventsmap
import (
"fmt"
"unsafe"
"github.com/cilium/cilium/pkg/bpf"
)
var (
MaxEntries int
)
const (
// MapName is the BPF map name.
MapName = "cilium_events"
)
// Key is the index into the prog array map.
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapKey
type Key struct {
index uint32
}
// Value is the program ID in the prog array map.
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapValue
type Value struct {
progID uint32
}
// GetKeyPtr returns the unsafe pointer to the BPF key
func (k *Key) GetKeyPtr() unsafe.Pointer { return unsafe.Pointer(k) }
// GetValuePtr returns the unsafe pointer to the BPF value
func (v *Value) GetValuePtr() unsafe.Pointer { return unsafe.Pointer(v) }
// String converts the key into a human readable string format.
func (k *Key) String() string { return fmt.Sprintf("%d", k.index) }
// String converts the value into a human readable string format.
func (v *Value) String() string { return fmt.Sprintf("%d", v.progID) }
// NewValue returns a new empty instance of the structure representing the BPF
// map value.
func (k Key) NewValue() bpf.MapValue { return &Value{} }
// InitMap creates the events map in the kernel.
func InitMap(maxEntries int) error {
MaxEntries = maxEntries
eventsMap := bpf.NewMap(MapName,
bpf.MapTypePerfEventArray,
&Key{},
int(unsafe.Sizeof(Key{})),
&Value{},
int(unsafe.Sizeof(Value{})),
MaxEntries,
0,
0,
bpf.ConvertKeyValue,
)
_, err := eventsMap.Create()
return err
}