Revert "Merge pull request 101888 from kolyshkin/update-runc-rc94"
This reverts commitb1b06fe0a4, reversing changes made to382a33986b.
This commit is contained in:
Jordan Liggitt
239
vendor/github.com/cilium/ebpf/info.go
generated
vendored
239
vendor/github.com/cilium/ebpf/info.go
generated
vendored
@@ -1,239 +0,0 @@
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package ebpf
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import (
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"bufio"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"os"
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"strings"
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"syscall"
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"time"
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"github.com/cilium/ebpf/internal"
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)
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// MapInfo describes a map.
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type MapInfo struct {
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Type MapType
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id MapID
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KeySize uint32
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ValueSize uint32
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MaxEntries uint32
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Flags uint32
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// Name as supplied by user space at load time.
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Name string
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}
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func newMapInfoFromFd(fd *internal.FD) (*MapInfo, error) {
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info, err := bpfGetMapInfoByFD(fd)
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if errors.Is(err, syscall.EINVAL) {
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return newMapInfoFromProc(fd)
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}
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if err != nil {
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return nil, err
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}
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return &MapInfo{
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MapType(info.map_type),
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MapID(info.id),
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info.key_size,
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info.value_size,
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info.max_entries,
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info.map_flags,
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// name is available from 4.15.
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internal.CString(info.name[:]),
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}, nil
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}
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func newMapInfoFromProc(fd *internal.FD) (*MapInfo, error) {
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var mi MapInfo
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err := scanFdInfo(fd, map[string]interface{}{
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"map_type": &mi.Type,
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"key_size": &mi.KeySize,
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"value_size": &mi.ValueSize,
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"max_entries": &mi.MaxEntries,
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"map_flags": &mi.Flags,
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})
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if err != nil {
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return nil, err
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}
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return &mi, nil
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}
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// ID returns the map ID.
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//
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// Available from 4.13.
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//
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// The bool return value indicates whether this optional field is available.
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func (mi *MapInfo) ID() (MapID, bool) {
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return mi.id, mi.id > 0
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}
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// programStats holds statistics of a program.
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type programStats struct {
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// Total accumulated runtime of the program ins ns.
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runtime time.Duration
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// Total number of times the program was called.
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runCount uint64
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}
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// ProgramInfo describes a program.
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type ProgramInfo struct {
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Type ProgramType
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id ProgramID
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// Truncated hash of the BPF bytecode.
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Tag string
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// Name as supplied by user space at load time.
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Name string
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stats *programStats
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}
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func newProgramInfoFromFd(fd *internal.FD) (*ProgramInfo, error) {
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info, err := bpfGetProgInfoByFD(fd)
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if errors.Is(err, syscall.EINVAL) {
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return newProgramInfoFromProc(fd)
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}
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if err != nil {
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return nil, err
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}
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return &ProgramInfo{
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Type: ProgramType(info.prog_type),
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id: ProgramID(info.id),
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// tag is available if the kernel supports BPF_PROG_GET_INFO_BY_FD.
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Tag: hex.EncodeToString(info.tag[:]),
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// name is available from 4.15.
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Name: internal.CString(info.name[:]),
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stats: &programStats{
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runtime: time.Duration(info.run_time_ns),
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runCount: info.run_cnt,
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},
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}, nil
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}
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func newProgramInfoFromProc(fd *internal.FD) (*ProgramInfo, error) {
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var info ProgramInfo
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err := scanFdInfo(fd, map[string]interface{}{
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"prog_type": &info.Type,
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"prog_tag": &info.Tag,
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})
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if errors.Is(err, errMissingFields) {
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return nil, &internal.UnsupportedFeatureError{
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Name: "reading program info from /proc/self/fdinfo",
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MinimumVersion: internal.Version{4, 10, 0},
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}
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}
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if err != nil {
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return nil, err
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}
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return &info, nil
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}
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// ID returns the program ID.
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//
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// Available from 4.13.
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//
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// The bool return value indicates whether this optional field is available.
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func (pi *ProgramInfo) ID() (ProgramID, bool) {
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return pi.id, pi.id > 0
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}
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// RunCount returns the total number of times the program was called.
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//
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// Can return 0 if the collection of statistics is not enabled. See EnableStats().
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// The bool return value indicates whether this optional field is available.
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func (pi *ProgramInfo) RunCount() (uint64, bool) {
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if pi.stats != nil {
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return pi.stats.runCount, true
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}
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return 0, false
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}
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// Runtime returns the total accumulated runtime of the program.
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//
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// Can return 0 if the collection of statistics is not enabled. See EnableStats().
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// The bool return value indicates whether this optional field is available.
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func (pi *ProgramInfo) Runtime() (time.Duration, bool) {
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if pi.stats != nil {
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return pi.stats.runtime, true
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}
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return time.Duration(0), false
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}
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func scanFdInfo(fd *internal.FD, fields map[string]interface{}) error {
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raw, err := fd.Value()
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if err != nil {
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return err
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}
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fh, err := os.Open(fmt.Sprintf("/proc/self/fdinfo/%d", raw))
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if err != nil {
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return err
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}
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defer fh.Close()
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if err := scanFdInfoReader(fh, fields); err != nil {
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return fmt.Errorf("%s: %w", fh.Name(), err)
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}
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return nil
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}
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var errMissingFields = errors.New("missing fields")
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func scanFdInfoReader(r io.Reader, fields map[string]interface{}) error {
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var (
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scanner = bufio.NewScanner(r)
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scanned int
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)
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for scanner.Scan() {
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parts := strings.SplitN(scanner.Text(), "\t", 2)
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if len(parts) != 2 {
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continue
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}
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name := strings.TrimSuffix(parts[0], ":")
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field, ok := fields[string(name)]
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if !ok {
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continue
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}
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if n, err := fmt.Sscanln(parts[1], field); err != nil || n != 1 {
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return fmt.Errorf("can't parse field %s: %v", name, err)
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}
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scanned++
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}
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if err := scanner.Err(); err != nil {
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return err
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}
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if scanned != len(fields) {
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return errMissingFields
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}
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return nil
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}
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// EnableStats starts the measuring of the runtime
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// and run counts of eBPF programs.
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//
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// Collecting statistics can have an impact on the performance.
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//
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// Requires at least 5.8.
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func EnableStats(which uint32) (io.Closer, error) {
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attr := internal.BPFEnableStatsAttr{
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StatsType: which,
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}
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fd, err := internal.BPFEnableStats(&attr)
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if err != nil {
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return nil, err
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}
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return fd, nil
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}
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