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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cgroups
import (
"io/ioutil"
"math"
"os"
"path/filepath"
"strconv"
"strings"
specs "github.com/opencontainers/runtime-spec/specs-go"
)
type rdmaController struct {
root string
}
func (p *rdmaController) Name() Name {
return Rdma
}
func (p *rdmaController) Path(path string) string {
return filepath.Join(p.root, path)
}
func NewRdma(root string) *rdmaController {
return &rdmaController{
root: filepath.Join(root, string(Rdma)),
}
}
func createCmdString(device string, limits *specs.LinuxRdma) string {
var cmdString string
cmdString = device
if limits.HcaHandles != nil {
cmdString = cmdString + " " + "hca_handle=" + strconv.FormatUint(uint64(*limits.HcaHandles), 10)
}
if limits.HcaObjects != nil {
cmdString = cmdString + " " + "hca_object=" + strconv.FormatUint(uint64(*limits.HcaObjects), 10)
}
return cmdString
}
func (p *rdmaController) Create(path string, resources *specs.LinuxResources) error {
if err := os.MkdirAll(p.Path(path), defaultDirPerm); err != nil {
return err
}
for device, limit := range resources.Rdma {
if device != "" && (limit.HcaHandles != nil || limit.HcaObjects != nil) {
return ioutil.WriteFile(
filepath.Join(p.Path(path), "rdma.max"),
[]byte(createCmdString(device, &limit)),
defaultFilePerm,
)
}
}
return nil
}
func (p *rdmaController) Update(path string, resources *specs.LinuxResources) error {
return p.Create(path, resources)
}
func parseRdmaKV(raw string, entry *RdmaEntry) {
var value uint64
var err error
parts := strings.Split(raw, "=")
switch len(parts) {
case 2:
if parts[1] == "max" {
value = math.MaxUint32
} else {
value, err = parseUint(parts[1], 10, 32)
if err != nil {
return
}
}
if parts[0] == "hca_handle" {
entry.HcaHandles = uint32(value)
} else if parts[0] == "hca_object" {
entry.HcaObjects = uint32(value)
}
}
}
func toRdmaEntry(strEntries []string) []*RdmaEntry {
var rdmaEntries []*RdmaEntry
for i := range strEntries {
parts := strings.Fields(strEntries[i])
switch len(parts) {
case 3:
entry := new(RdmaEntry)
entry.Device = parts[0]
parseRdmaKV(parts[1], entry)
parseRdmaKV(parts[2], entry)
rdmaEntries = append(rdmaEntries, entry)
default:
continue
}
}
return rdmaEntries
}
func (p *rdmaController) Stat(path string, stats *Metrics) error {
currentData, err := ioutil.ReadFile(filepath.Join(p.Path(path), "rdma.current"))
if err != nil {
return err
}
currentPerDevices := strings.Split(string(currentData), "\n")
maxData, err := ioutil.ReadFile(filepath.Join(p.Path(path), "rdma.max"))
if err != nil {
return err
}
maxPerDevices := strings.Split(string(maxData), "\n")
// If device got removed between reading two files, ignore returning
// stats.
if len(currentPerDevices) != len(maxPerDevices) {
return nil
}
currentEntries := toRdmaEntry(currentPerDevices)
maxEntries := toRdmaEntry(maxPerDevices)
stats.Rdma = &RdmaStat{
Current: currentEntries,
Limit: maxEntries,
}
return nil
}
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