handle more columns from softnet_data (#473)

* handle more column from softnet_data
    * add CPUCollision for linux 2.6
    * add ReceivedRps and FlowLimitCount for linux >4.17
    * add SoftnetBacklogLen and Index for linux 5.10 torvalds/linux@7d58e65
    * add Width so anyone can choose to use Index instead of line index, see
    * the commit torvalds/linux@7d58e65
* following the merge of RedHatInsights/insights-core#3561, adding support for 9,10,11 and 13 columns, unitest has also more case

Signed-off-by: remi <[email protected]>

Author: remijouannet

net_softnet.go

@@ -27,8 +27,9 @@ import (
 // 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.
+// * Linux 2.6.39 https://elixir.bootlin.com/linux/v2.6.39/source/net/core/dev.c#L4086
+// * Linux 4.18 https://elixir.bootlin.com/linux/v4.18/source/net/core/net-procfs.c#L162
+// * Linux 5.14 https://elixir.bootlin.com/linux/v5.14/source/net/core/net-procfs.c#L169
 
 // SoftnetStat contains a single row of data from /proc/net/softnet_stat.
 type SoftnetStat struct {
@@ -38,6 +39,18 @@ type SoftnetStat struct {
 	Dropped uint32
 	// Number of times processing packets ran out of quota.
 	TimeSqueezed uint32
+	// Number of collision occur while obtaining device lock while transmitting.
+	CPUCollision uint32
+	// Number of times cpu woken up received_rps.
+	ReceivedRps uint32
+	// number of times flow limit has been reached.
+	FlowLimitCount uint32
+	// Softnet backlog status.
+	SoftnetBacklogLen uint32
+	// CPU id owning this softnet_data.
+	Index uint32
+	// softnet_data's Width.
+	Width int
 }
 
 var softNetProcFile = "net/softnet_stat"
@@ -66,22 +79,57 @@ func parseSoftnet(r io.Reader) ([]SoftnetStat, error) {
 	for s.Scan() {
 		columns := strings.Fields(s.Text())
 		width := len(columns)
+		softnetStat := SoftnetStat{}
 
 		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
+		// Linux 2.6.23 https://elixir.bootlin.com/linux/v2.6.23/source/net/core/dev.c#L2347
+		if width >= minColumns {
+			us, err := parseHexUint32s(columns[0:9])
+			if err != nil {
+				return nil, err
+			}
+
+			softnetStat.Processed = us[0]
+			softnetStat.Dropped = us[1]
+			softnetStat.TimeSqueezed = us[2]
+			softnetStat.CPUCollision = us[8]
+		}
+
+		// Linux 2.6.39 https://elixir.bootlin.com/linux/v2.6.39/source/net/core/dev.c#L4086
+		if width >= 10 {
+			us, err := parseHexUint32s(columns[9:10])
+			if err != nil {
+				return nil, err
+			}
+
+			softnetStat.ReceivedRps = us[0]
 		}
 
-		stats = append(stats, SoftnetStat{
-			Processed:    us[0],
-			Dropped:      us[1],
-			TimeSqueezed: us[2],
-		})
+		// Linux 4.18 https://elixir.bootlin.com/linux/v4.18/source/net/core/net-procfs.c#L162
+		if width >= 11 {
+			us, err := parseHexUint32s(columns[10:11])
+			if err != nil {
+				return nil, err
+			}
+
+			softnetStat.FlowLimitCount = us[0]
+		}
+
+		// Linux 5.14 https://elixir.bootlin.com/linux/v5.14/source/net/core/net-procfs.c#L169
+		if width >= 13 {
+			us, err := parseHexUint32s(columns[11:13])
+			if err != nil {
+				return nil, err
+			}
+
+			softnetStat.SoftnetBacklogLen = us[0]
+			softnetStat.Index = us[1]
+		}
+		softnetStat.Width = width
+		stats = append(stats, softnetStat)
 	}
 
 	return stats, nil

net_softnet_test.go

@@ -25,15 +25,54 @@ func TestNetSoftnet(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	want := []SoftnetStat{{
-		Processed:    0x00015c73,
-		Dropped:      0x00020e76,
-		TimeSqueezed: 0xf0000769,
-	},
+	want := []SoftnetStat{
+		{
+			Processed:         0x00358fe3,
+			Dropped:           0x00006283,
+			TimeSqueezed:      0x00000000,
+			CPUCollision:      0x00000000,
+			ReceivedRps:       0x000855fc,
+			FlowLimitCount:    0x00000076,
+			SoftnetBacklogLen: 0x00000000,
+			Index:             0x00000000,
+			Width:             13,
+		},
+		{
+			Processed:         0x00953d1a,
+			Dropped:           0x00000446,
+			TimeSqueezed:      0x000000b1,
+			CPUCollision:      0x00000000,
+			ReceivedRps:       0x008eeb9a,
+			FlowLimitCount:    0x0000002b,
+			SoftnetBacklogLen: 0x000000dc,
+			Index:             0x00000001,
+			Width:             13,
+		},
+		{
+			Processed:      0x00015c73,
+			Dropped:        0x00020e76,
+			TimeSqueezed:   0xf0000769,
+			CPUCollision:   0x00000004,
+			ReceivedRps:    0x00000003,
+			FlowLimitCount: 0x00000002,
+			Width:          11,
+		},
 		{
 			Processed:    0x01663fb2,
+			Dropped:      0x00000000,
 			TimeSqueezed: 0x0109a4,
-		}}
+			CPUCollision: 0x00020e76,
+			Width:        9,
+		},
+		{
+			Processed:    0x00008e78,
+			Dropped:      0x00000001,
+			TimeSqueezed: 0x00000011,
+			CPUCollision: 0x00000020,
+			ReceivedRps:  0x00000010,
+			Width:        10,
+		},
+	}
 
 	got, err := fs.NetSoftnetStat()
 	if err != nil {

testdata/fixtures.ttar

@@ -2482,9 +2482,12 @@ FRAG6: inuse 0 memory 0
 Mode: 444
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/proc/net/softnet_stat
-Lines: 2
-00015c73 00020e76 F0000769 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
-01663fb2 00000000 000109a4 00000000 00000000 00000000 00000000 00000000 00000000
+Lines: 5
+00358fe3 00006283 00000000 00000000 00000000 00000000 00000000 00000000 00000000 000855fc 00000076 00000000 00000000
+00953d1a 00000446 000000b1 00000000 00000000 00000000 00000000 00000000 00000000 008eeb9a 0000002b 000000dc 00000001
+00015c73 00020e76 f0000769 00000000 00000000 00000000 00000000 00000000 00000004 00000003 00000002
+01663fb2 00000000 000109a4 00000000 00000000 00000000 00000000 00000000 00020e76
+00008e78 00000001 00000011 00000000 00000000 00000000 00000000 00000000 00000020 00000010
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/proc/net/softnet_stat.broken