intel-device-plugins-for-kubernetes/cmd/internal/pluginutils/sriov.go

// Copyright 2021 Intel Corporation. All Rights Reserved.
//
// 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 pluginutils

import (
	"os"
	"path"
	"strings"
)

// IsSriovPFwithVFs returns true if the device with given pfpath has virtual functions, false otherwise.
func IsSriovPFwithVFs(pfpath string) bool {
	dat := GetSriovNumVFs(pfpath)
	return dat != "-1" && dat != "0"
}

func GetSriovNumVFs(sysFSPath string) string {
	dat, err := os.ReadFile(path.Join(sysFSPath, "device/sriov_numvfs"))
	if err != nil {
		return "-1"
	}

	return strings.TrimSpace(string(dat))
}