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Supports map of maps #298

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Supports map of maps #298

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22 changes: 22 additions & 0 deletions bcc/table.go
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,12 @@ func (table *Table) Name() string {
return C.GoString(C.bpf_table_name(table.module.p, table.id))
}

// Fd returns the table file descriptor.
func (table *Table) Fd() int {
mod := table.module.p
return int(C.bpf_table_fd_id(mod, table.id))
}

// Config returns the table properties (name, fd, ...).
func (table *Table) Config() map[string]interface{} {
mod := table.module.p
Expand Down Expand Up @@ -228,6 +234,22 @@ func (table *Table) SetP(key, leaf unsafe.Pointer) error {
return nil
}

// SetMap sets a key to values for BPF_HASH_OF_MAPS and BPF_ARRAY_OF_MAPS.
func (table *Table) SetMap(key unsafe.Pointer, innerMapFd int) error {
fd := C.bpf_table_fd_id(table.module.p, table.id)

leaf := make([]byte, 8)
GetHostByteOrder().PutUint64(leaf, uint64(innerMapFd))
leafP := unsafe.Pointer(&leaf[0])

_, err := C.bpf_update_elem(fd, key, leafP, 0)
if err != nil {
return err
}

return nil
}

// Delete a key.
func (table *Table) Delete(key []byte) error {
fd := C.bpf_table_fd_id(table.module.p, table.id)
Expand Down