vendor containerd/cgroups

We need to vendor in the latest containerd/cgroups for a fix related to
slice delegation and systemd <= 239. The opencontainer/runtime-spec is
brought along for the ride.

Signed-off-by: baude <bbaude@redhat.com>

Closes: #1414
Approved by: mheon

vendor/github.com/containerd/cgroups/rdma.go

@@ -0,0 +1,153 @@
+/*
+   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
+}