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package fscommon
import (
"bufio"
"errors"
"math"
"os"
"strconv"
"strings"
"golang.org/x/sys/unix"
"github.com/opencontainers/cgroups"
)
// parseRdmaKV parses raw string to RdmaEntry.
func parseRdmaKV(raw string, entry *cgroups.RdmaEntry) error {
var value uint32
k, v, ok := strings.Cut(raw, "=")
if !ok {
return errors.New("Unable to parse RDMA entry")
}
if v == "max" {
value = math.MaxUint32
} else {
val64, err := strconv.ParseUint(v, 10, 32)
if err != nil {
return err
}
value = uint32(val64)
}
switch k {
case "hca_handle":
entry.HcaHandles = value
case "hca_object":
entry.HcaObjects = value
}
return nil
}
// readRdmaEntries reads and converts array of rawstrings to RdmaEntries from file.
// example entry: mlx4_0 hca_handle=2 hca_object=2000
func readRdmaEntries(dir, file string) ([]cgroups.RdmaEntry, error) {
rdmaEntries := make([]cgroups.RdmaEntry, 0)
fd, err := cgroups.OpenFile(dir, file, unix.O_RDONLY)
if err != nil {
return nil, err
}
defer fd.Close()
scanner := bufio.NewScanner(fd)
for scanner.Scan() {
parts := strings.SplitN(scanner.Text(), " ", 4)
if len(parts) == 3 {
entry := new(cgroups.RdmaEntry)
entry.Device = parts[0]
err = parseRdmaKV(parts[1], entry)
if err != nil {
continue
}
err = parseRdmaKV(parts[2], entry)
if err != nil {
continue
}
rdmaEntries = append(rdmaEntries, *entry)
}
}
return rdmaEntries, scanner.Err()
}
// RdmaGetStats returns rdma stats such as totalLimit and current entries.
func RdmaGetStats(path string, stats *cgroups.Stats) error {
currentEntries, err := readRdmaEntries(path, "rdma.current")
if err != nil {
if errors.Is(err, os.ErrNotExist) {
err = nil
}
return err
}
maxEntries, err := readRdmaEntries(path, "rdma.max")
if err != nil {
return err
}
// If device got removed between reading two files, ignore returning stats.
if len(currentEntries) != len(maxEntries) {
return nil
}
stats.RdmaStats = cgroups.RdmaStats{
RdmaLimit: maxEntries,
RdmaCurrent: currentEntries,
}
return nil
}
func createCmdString(device string, limits cgroups.LinuxRdma) string {
cmdString := device
if limits.HcaHandles != nil {
cmdString += " hca_handle=" + strconv.FormatUint(uint64(*limits.HcaHandles), 10)
}
if limits.HcaObjects != nil {
cmdString += " hca_object=" + strconv.FormatUint(uint64(*limits.HcaObjects), 10)
}
return cmdString
}
// RdmaSet sets RDMA resources.
func RdmaSet(path string, r *cgroups.Resources) error {
for device, limits := range r.Rdma {
if err := cgroups.WriteFile(path, "rdma.max", createCmdString(device, limits)); err != nil {
return err
}
}
return nil
}
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