[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/prometheus/procfs/net_softnet.go b/vendor/github.com/prometheus/procfs/net_softnet.go
new file mode 100644
index 0000000..46f12c6
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/net_softnet.go
@@ -0,0 +1,102 @@
+// Copyright 2019 The Prometheus 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 procfs
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "io"
+ "strconv"
+ "strings"
+
+ "github.com/prometheus/procfs/internal/util"
+)
+
+// For the proc file format details,
+// See:
+// * Linux 2.6.23 https://elixir.bootlin.com/linux/v2.6.23/source/net/core/dev.c#L2343
+// * Linux 4.17 https://elixir.bootlin.com/linux/v4.17/source/net/core/net-procfs.c#L162
+// and https://elixir.bootlin.com/linux/v4.17/source/include/linux/netdevice.h#L2810.
+
+// SoftnetStat contains a single row of data from /proc/net/softnet_stat
+type SoftnetStat struct {
+ // Number of processed packets
+ Processed uint32
+ // Number of dropped packets
+ Dropped uint32
+ // Number of times processing packets ran out of quota
+ TimeSqueezed uint32
+}
+
+var softNetProcFile = "net/softnet_stat"
+
+// NetSoftnetStat reads data from /proc/net/softnet_stat.
+func (fs FS) NetSoftnetStat() ([]SoftnetStat, error) {
+ b, err := util.ReadFileNoStat(fs.proc.Path(softNetProcFile))
+ if err != nil {
+ return nil, err
+ }
+
+ entries, err := parseSoftnet(bytes.NewReader(b))
+ if err != nil {
+ return nil, fmt.Errorf("failed to parse /proc/net/softnet_stat: %w", err)
+ }
+
+ return entries, nil
+}
+
+func parseSoftnet(r io.Reader) ([]SoftnetStat, error) {
+ const minColumns = 9
+
+ s := bufio.NewScanner(r)
+
+ var stats []SoftnetStat
+ for s.Scan() {
+ columns := strings.Fields(s.Text())
+ width := len(columns)
+
+ if width < minColumns {
+ return nil, fmt.Errorf("%d columns were detected, but at least %d were expected", width, minColumns)
+ }
+
+ // We only parse the first three columns at the moment.
+ us, err := parseHexUint32s(columns[0:3])
+ if err != nil {
+ return nil, err
+ }
+
+ stats = append(stats, SoftnetStat{
+ Processed: us[0],
+ Dropped: us[1],
+ TimeSqueezed: us[2],
+ })
+ }
+
+ return stats, nil
+}
+
+func parseHexUint32s(ss []string) ([]uint32, error) {
+ us := make([]uint32, 0, len(ss))
+ for _, s := range ss {
+ u, err := strconv.ParseUint(s, 16, 32)
+ if err != nil {
+ return nil, err
+ }
+
+ us = append(us, uint32(u))
+ }
+
+ return us, nil
+}