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counter.go
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counter.go
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// Copyright 2016 Platina Systems, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Network counters + packet/byte counters optimized for large tables and cache locality.
package vnet
import (
"github.com/platinasystems/elib"
)
// Array of single counters
type Counters struct {
// Compact cache-friendly counters that (rarely) can overflow.
mini elib.Uint16Vec
// 64 bit counters to hold overflow from mini counters.
maxi elib.Uint64Vec
// For testing; nil for normal operation.
debug elib.Uint64Vec
// Counter values when last cleared or zero if counters have never been cleared.
valuesLastClear elib.Uint64Vec
}
//go:generate gentemplate -d Package=vnet -id countersVec -d VecType=CountersVec -d Type=Counters github.com/platinasystems/elib/vec.tmpl
func (c *Counters) Validate(i uint) {
c.mini.Validate(i)
c.maxi.Validate(i)
c.valuesLastClear.Validate(i)
}
// Add x to counter with index i.
func (c *Counters) Add(i, x uint) {
mini := &c.mini[i]
old := uint(*mini)
new := old + x
*mini = uint16(new)
if uint(*mini) != new {
c.maxi[i] += uint64(old + x)
*mini = 0
}
}
func (c *Counters) Add64(i uint, x uint64) { c.maxi[i] += x }
func (c *Counters) Get(i uint, v *uint64) {
*v = c.maxi[i] + uint64(c.mini[i]) - c.valuesLastClear[i]
return
}
func (c *Counters) Value(i uint) (v uint64) {
c.Get(i, &v)
return
}
func (c *Counters) Clear(i uint) {
v := c.maxi[i] + uint64(c.mini[i])
c.valuesLastClear[i] = v
c.maxi[i] = v
c.mini[i] = 0
}
func (c *Counters) ClearAll() {
for i := range c.valuesLastClear {
c.Clear(uint(i))
}
}
func (c CountersVec) ClearAll() {
for i := range c {
c[i].ClearAll()
}
}
type CombinedCounter struct{ Packets, Bytes uint64 }
func (c *CombinedCounter) Zero() {
c.Packets = 0
c.Bytes = 0
}
func (c *CombinedCounter) Add(d *CombinedCounter) {
c.Packets += d.Packets
c.Bytes += d.Bytes
}
func (c *CombinedCounter) subNoValidate(d *CombinedCounter) {
c.Packets -= d.Packets
c.Bytes -= d.Bytes
}
func (c *CombinedCounter) Sub(d *CombinedCounter) {
if d.Packets > c.Packets || d.Bytes > c.Bytes {
panic("underflow")
}
c.subNoValidate(d)
}
type miniCombinedCounter struct {
// Packet count.
packets uint16
// Byte count = packets * ave-packet-size + byte_difference
byteDiff int16
}
func (c *miniCombinedCounter) Zero() {
c.packets = 0
c.byteDiff = 0
}
//go:generate gentemplate -d Package=vnet -id miniCombinedCounter -d VecType=miniCombinedCounterVec -d Type=miniCombinedCounter github.com/platinasystems/elib/vec.tmpl
//go:generate gentemplate -d Package=vnet -id CombinedCounter -d VecType=CombinedCounterVec -d Type=CombinedCounter github.com/platinasystems/elib/vec.tmpl
type CombinedCounters struct {
// 64 bit packet and byte counters.
values CombinedCounterVec
valuesLastClear CombinedCounterVec
// Average packet size in bytes used to compute mini-counter byte differences.
avePacketSize uint
// Current summed packets and bytes for average computation.
sumPackets, sumBytes uint
avePacketSizeRecomputeInterval uint
}
//go:generate gentemplate -d Package=vnet -id combinedCountersVec -d VecType=CombinedCountersVec -d Type=CombinedCounters github.com/platinasystems/elib/vec.tmpl
func (c *CombinedCounters) Validate(i uint) {
c.values.Validate(i)
c.valuesLastClear.Validate(i)
}
// Add packet and byte increment to counter.
func (c *CombinedCounters) Add64(i uint, p, b uint64) {
v := &c.values[i]
v.Packets += p
v.Bytes += b
}
func (c *CombinedCounters) Add(i uint, p, b uint) { c.Add64(i, uint64(p), uint64(b)) }
func (c *Counters) Set(i uint, x uint64) {
c.maxi[i] = x
}
// Get counter value: 2 flavors.
func (c *CombinedCounters) Get(i uint, r *CombinedCounter) {
*r = c.values[i]
r.subNoValidate(&c.valuesLastClear[i])
}
func (c *CombinedCounters) Value(i uint) (v CombinedCounter) {
c.Get(i, &v)
return
}
func (c *CombinedCounters) Clear(i uint) {
c.valuesLastClear[i] = c.values[i]
}
func (c *CombinedCounters) ClearAll() { copy(c.valuesLastClear[:], c.values) }
func (c CombinedCountersVec) ClearAll() {
for i := range c {
c[i].ClearAll()
}
}