669 lines
17 KiB
Go
669 lines
17 KiB
Go
package netlink
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import (
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"fmt"
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"io/ioutil"
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"strconv"
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"strings"
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"syscall"
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"github.com/vishvananda/netlink/nl"
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"golang.org/x/sys/unix"
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)
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// NOTE function is here because it uses other linux functions
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func NewNetem(attrs QdiscAttrs, nattrs NetemQdiscAttrs) *Netem {
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var limit uint32 = 1000
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var lossCorr, delayCorr, duplicateCorr uint32
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var reorderProb, reorderCorr uint32
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var corruptProb, corruptCorr uint32
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latency := nattrs.Latency
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loss := Percentage2u32(nattrs.Loss)
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gap := nattrs.Gap
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duplicate := Percentage2u32(nattrs.Duplicate)
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jitter := nattrs.Jitter
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// Correlation
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if latency > 0 && jitter > 0 {
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delayCorr = Percentage2u32(nattrs.DelayCorr)
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}
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if loss > 0 {
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lossCorr = Percentage2u32(nattrs.LossCorr)
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}
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if duplicate > 0 {
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duplicateCorr = Percentage2u32(nattrs.DuplicateCorr)
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}
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// FIXME should validate values(like loss/duplicate are percentages...)
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latency = time2Tick(latency)
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if nattrs.Limit != 0 {
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limit = nattrs.Limit
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}
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// Jitter is only value if latency is > 0
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if latency > 0 {
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jitter = time2Tick(jitter)
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}
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reorderProb = Percentage2u32(nattrs.ReorderProb)
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reorderCorr = Percentage2u32(nattrs.ReorderCorr)
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if reorderProb > 0 {
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// ERROR if lantency == 0
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if gap == 0 {
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gap = 1
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}
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}
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corruptProb = Percentage2u32(nattrs.CorruptProb)
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corruptCorr = Percentage2u32(nattrs.CorruptCorr)
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return &Netem{
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QdiscAttrs: attrs,
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Latency: latency,
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DelayCorr: delayCorr,
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Limit: limit,
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Loss: loss,
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LossCorr: lossCorr,
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Gap: gap,
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Duplicate: duplicate,
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DuplicateCorr: duplicateCorr,
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Jitter: jitter,
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ReorderProb: reorderProb,
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ReorderCorr: reorderCorr,
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CorruptProb: corruptProb,
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CorruptCorr: corruptCorr,
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}
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}
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// QdiscDel will delete a qdisc from the system.
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// Equivalent to: `tc qdisc del $qdisc`
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func QdiscDel(qdisc Qdisc) error {
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return pkgHandle.QdiscDel(qdisc)
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}
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// QdiscDel will delete a qdisc from the system.
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// Equivalent to: `tc qdisc del $qdisc`
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func (h *Handle) QdiscDel(qdisc Qdisc) error {
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return h.qdiscModify(unix.RTM_DELQDISC, 0, qdisc)
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}
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// QdiscChange will change a qdisc in place
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// Equivalent to: `tc qdisc change $qdisc`
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// The parent and handle MUST NOT be changed.
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func QdiscChange(qdisc Qdisc) error {
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return pkgHandle.QdiscChange(qdisc)
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}
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// QdiscChange will change a qdisc in place
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// Equivalent to: `tc qdisc change $qdisc`
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// The parent and handle MUST NOT be changed.
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func (h *Handle) QdiscChange(qdisc Qdisc) error {
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return h.qdiscModify(unix.RTM_NEWQDISC, 0, qdisc)
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}
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// QdiscReplace will replace a qdisc to the system.
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// Equivalent to: `tc qdisc replace $qdisc`
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// The handle MUST change.
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func QdiscReplace(qdisc Qdisc) error {
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return pkgHandle.QdiscReplace(qdisc)
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}
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// QdiscReplace will replace a qdisc to the system.
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// Equivalent to: `tc qdisc replace $qdisc`
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// The handle MUST change.
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func (h *Handle) QdiscReplace(qdisc Qdisc) error {
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return h.qdiscModify(
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unix.RTM_NEWQDISC,
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unix.NLM_F_CREATE|unix.NLM_F_REPLACE,
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qdisc)
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}
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// QdiscAdd will add a qdisc to the system.
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// Equivalent to: `tc qdisc add $qdisc`
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func QdiscAdd(qdisc Qdisc) error {
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return pkgHandle.QdiscAdd(qdisc)
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}
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// QdiscAdd will add a qdisc to the system.
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// Equivalent to: `tc qdisc add $qdisc`
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func (h *Handle) QdiscAdd(qdisc Qdisc) error {
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return h.qdiscModify(
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unix.RTM_NEWQDISC,
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unix.NLM_F_CREATE|unix.NLM_F_EXCL,
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qdisc)
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}
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func (h *Handle) qdiscModify(cmd, flags int, qdisc Qdisc) error {
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req := h.newNetlinkRequest(cmd, flags|unix.NLM_F_ACK)
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base := qdisc.Attrs()
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msg := &nl.TcMsg{
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Family: nl.FAMILY_ALL,
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Ifindex: int32(base.LinkIndex),
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Handle: base.Handle,
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Parent: base.Parent,
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}
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req.AddData(msg)
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// When deleting don't bother building the rest of the netlink payload
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if cmd != unix.RTM_DELQDISC {
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if err := qdiscPayload(req, qdisc); err != nil {
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return err
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}
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}
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_, err := req.Execute(unix.NETLINK_ROUTE, 0)
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return err
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}
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func qdiscPayload(req *nl.NetlinkRequest, qdisc Qdisc) error {
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req.AddData(nl.NewRtAttr(nl.TCA_KIND, nl.ZeroTerminated(qdisc.Type())))
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options := nl.NewRtAttr(nl.TCA_OPTIONS, nil)
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switch qdisc := qdisc.(type) {
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case *Prio:
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tcmap := nl.TcPrioMap{
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Bands: int32(qdisc.Bands),
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Priomap: qdisc.PriorityMap,
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}
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options = nl.NewRtAttr(nl.TCA_OPTIONS, tcmap.Serialize())
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case *Tbf:
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opt := nl.TcTbfQopt{}
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opt.Rate.Rate = uint32(qdisc.Rate)
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opt.Peakrate.Rate = uint32(qdisc.Peakrate)
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opt.Limit = qdisc.Limit
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opt.Buffer = qdisc.Buffer
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options.AddRtAttr(nl.TCA_TBF_PARMS, opt.Serialize())
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if qdisc.Rate >= uint64(1<<32) {
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options.AddRtAttr(nl.TCA_TBF_RATE64, nl.Uint64Attr(qdisc.Rate))
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}
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if qdisc.Peakrate >= uint64(1<<32) {
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options.AddRtAttr(nl.TCA_TBF_PRATE64, nl.Uint64Attr(qdisc.Peakrate))
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}
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if qdisc.Peakrate > 0 {
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options.AddRtAttr(nl.TCA_TBF_PBURST, nl.Uint32Attr(qdisc.Minburst))
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}
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case *Htb:
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opt := nl.TcHtbGlob{}
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opt.Version = qdisc.Version
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opt.Rate2Quantum = qdisc.Rate2Quantum
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opt.Defcls = qdisc.Defcls
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// TODO: Handle Debug properly. For now default to 0
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opt.Debug = qdisc.Debug
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opt.DirectPkts = qdisc.DirectPkts
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options.AddRtAttr(nl.TCA_HTB_INIT, opt.Serialize())
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// options.AddRtAttr(nl.TCA_HTB_DIRECT_QLEN, opt.Serialize())
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case *Hfsc:
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opt := nl.TcHfscOpt{}
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opt.Defcls = qdisc.Defcls
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options = nl.NewRtAttr(nl.TCA_OPTIONS, opt.Serialize())
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case *Netem:
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opt := nl.TcNetemQopt{}
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opt.Latency = qdisc.Latency
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opt.Limit = qdisc.Limit
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opt.Loss = qdisc.Loss
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opt.Gap = qdisc.Gap
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opt.Duplicate = qdisc.Duplicate
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opt.Jitter = qdisc.Jitter
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options = nl.NewRtAttr(nl.TCA_OPTIONS, opt.Serialize())
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// Correlation
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corr := nl.TcNetemCorr{}
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corr.DelayCorr = qdisc.DelayCorr
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corr.LossCorr = qdisc.LossCorr
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corr.DupCorr = qdisc.DuplicateCorr
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if corr.DelayCorr > 0 || corr.LossCorr > 0 || corr.DupCorr > 0 {
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options.AddRtAttr(nl.TCA_NETEM_CORR, corr.Serialize())
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}
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// Corruption
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corruption := nl.TcNetemCorrupt{}
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corruption.Probability = qdisc.CorruptProb
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corruption.Correlation = qdisc.CorruptCorr
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if corruption.Probability > 0 {
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options.AddRtAttr(nl.TCA_NETEM_CORRUPT, corruption.Serialize())
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}
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// Reorder
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reorder := nl.TcNetemReorder{}
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reorder.Probability = qdisc.ReorderProb
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reorder.Correlation = qdisc.ReorderCorr
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if reorder.Probability > 0 {
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options.AddRtAttr(nl.TCA_NETEM_REORDER, reorder.Serialize())
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}
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case *Ingress:
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// ingress filters must use the proper handle
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if qdisc.Attrs().Parent != HANDLE_INGRESS {
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return fmt.Errorf("Ingress filters must set Parent to HANDLE_INGRESS")
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}
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case *FqCodel:
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options.AddRtAttr(nl.TCA_FQ_CODEL_ECN, nl.Uint32Attr((uint32(qdisc.ECN))))
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if qdisc.Limit > 0 {
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options.AddRtAttr(nl.TCA_FQ_CODEL_LIMIT, nl.Uint32Attr((uint32(qdisc.Limit))))
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}
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if qdisc.Interval > 0 {
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options.AddRtAttr(nl.TCA_FQ_CODEL_INTERVAL, nl.Uint32Attr((uint32(qdisc.Interval))))
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}
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if qdisc.Flows > 0 {
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options.AddRtAttr(nl.TCA_FQ_CODEL_FLOWS, nl.Uint32Attr((uint32(qdisc.Flows))))
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}
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if qdisc.Quantum > 0 {
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options.AddRtAttr(nl.TCA_FQ_CODEL_QUANTUM, nl.Uint32Attr((uint32(qdisc.Quantum))))
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}
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case *Fq:
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options.AddRtAttr(nl.TCA_FQ_RATE_ENABLE, nl.Uint32Attr((uint32(qdisc.Pacing))))
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if qdisc.Buckets > 0 {
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options.AddRtAttr(nl.TCA_FQ_BUCKETS_LOG, nl.Uint32Attr((uint32(qdisc.Buckets))))
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}
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if qdisc.LowRateThreshold > 0 {
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options.AddRtAttr(nl.TCA_FQ_LOW_RATE_THRESHOLD, nl.Uint32Attr((uint32(qdisc.LowRateThreshold))))
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}
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if qdisc.Quantum > 0 {
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options.AddRtAttr(nl.TCA_FQ_QUANTUM, nl.Uint32Attr((uint32(qdisc.Quantum))))
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}
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if qdisc.InitialQuantum > 0 {
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options.AddRtAttr(nl.TCA_FQ_INITIAL_QUANTUM, nl.Uint32Attr((uint32(qdisc.InitialQuantum))))
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}
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if qdisc.FlowRefillDelay > 0 {
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options.AddRtAttr(nl.TCA_FQ_FLOW_REFILL_DELAY, nl.Uint32Attr((uint32(qdisc.FlowRefillDelay))))
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}
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if qdisc.FlowPacketLimit > 0 {
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options.AddRtAttr(nl.TCA_FQ_FLOW_PLIMIT, nl.Uint32Attr((uint32(qdisc.FlowPacketLimit))))
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}
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if qdisc.FlowMaxRate > 0 {
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options.AddRtAttr(nl.TCA_FQ_FLOW_MAX_RATE, nl.Uint32Attr((uint32(qdisc.FlowMaxRate))))
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}
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if qdisc.FlowDefaultRate > 0 {
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options.AddRtAttr(nl.TCA_FQ_FLOW_DEFAULT_RATE, nl.Uint32Attr((uint32(qdisc.FlowDefaultRate))))
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}
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default:
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options = nil
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}
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if options != nil {
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req.AddData(options)
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}
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return nil
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}
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// QdiscList gets a list of qdiscs in the system.
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// Equivalent to: `tc qdisc show`.
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// The list can be filtered by link.
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func QdiscList(link Link) ([]Qdisc, error) {
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return pkgHandle.QdiscList(link)
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}
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// QdiscList gets a list of qdiscs in the system.
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// Equivalent to: `tc qdisc show`.
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// The list can be filtered by link.
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func (h *Handle) QdiscList(link Link) ([]Qdisc, error) {
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req := h.newNetlinkRequest(unix.RTM_GETQDISC, unix.NLM_F_DUMP)
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index := int32(0)
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if link != nil {
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base := link.Attrs()
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h.ensureIndex(base)
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index = int32(base.Index)
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}
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msg := &nl.TcMsg{
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Family: nl.FAMILY_ALL,
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Ifindex: index,
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}
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req.AddData(msg)
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msgs, err := req.Execute(unix.NETLINK_ROUTE, unix.RTM_NEWQDISC)
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if err != nil {
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return nil, err
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}
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var res []Qdisc
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for _, m := range msgs {
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msg := nl.DeserializeTcMsg(m)
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attrs, err := nl.ParseRouteAttr(m[msg.Len():])
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if err != nil {
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return nil, err
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}
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// skip qdiscs from other interfaces
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if link != nil && msg.Ifindex != index {
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continue
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}
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base := QdiscAttrs{
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LinkIndex: int(msg.Ifindex),
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Handle: msg.Handle,
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Parent: msg.Parent,
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Refcnt: msg.Info,
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}
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var qdisc Qdisc
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qdiscType := ""
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for _, attr := range attrs {
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switch attr.Attr.Type {
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case nl.TCA_KIND:
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qdiscType = string(attr.Value[:len(attr.Value)-1])
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switch qdiscType {
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case "pfifo_fast":
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qdisc = &PfifoFast{}
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case "prio":
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qdisc = &Prio{}
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case "tbf":
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qdisc = &Tbf{}
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case "ingress":
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qdisc = &Ingress{}
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case "htb":
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qdisc = &Htb{}
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case "fq":
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qdisc = &Fq{}
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case "hfsc":
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qdisc = &Hfsc{}
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case "fq_codel":
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qdisc = &FqCodel{}
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case "netem":
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qdisc = &Netem{}
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default:
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qdisc = &GenericQdisc{QdiscType: qdiscType}
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}
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case nl.TCA_OPTIONS:
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switch qdiscType {
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case "pfifo_fast":
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// pfifo returns TcPrioMap directly without wrapping it in rtattr
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if err := parsePfifoFastData(qdisc, attr.Value); err != nil {
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return nil, err
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}
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case "prio":
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// prio returns TcPrioMap directly without wrapping it in rtattr
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if err := parsePrioData(qdisc, attr.Value); err != nil {
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return nil, err
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}
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case "tbf":
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data, err := nl.ParseRouteAttr(attr.Value)
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if err != nil {
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return nil, err
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}
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if err := parseTbfData(qdisc, data); err != nil {
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return nil, err
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}
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case "hfsc":
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if err := parseHfscData(qdisc, attr.Value); err != nil {
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return nil, err
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}
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case "htb":
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data, err := nl.ParseRouteAttr(attr.Value)
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if err != nil {
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return nil, err
|
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}
|
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if err := parseHtbData(qdisc, data); err != nil {
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return nil, err
|
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}
|
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case "fq":
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data, err := nl.ParseRouteAttr(attr.Value)
|
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if err != nil {
|
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return nil, err
|
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}
|
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if err := parseFqData(qdisc, data); err != nil {
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return nil, err
|
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}
|
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case "fq_codel":
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data, err := nl.ParseRouteAttr(attr.Value)
|
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if err != nil {
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return nil, err
|
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}
|
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if err := parseFqCodelData(qdisc, data); err != nil {
|
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return nil, err
|
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}
|
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case "netem":
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if err := parseNetemData(qdisc, attr.Value); err != nil {
|
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return nil, err
|
|
}
|
|
|
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// no options for ingress
|
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}
|
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}
|
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}
|
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*qdisc.Attrs() = base
|
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res = append(res, qdisc)
|
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}
|
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|
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return res, nil
|
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}
|
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|
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func parsePfifoFastData(qdisc Qdisc, value []byte) error {
|
|
pfifo := qdisc.(*PfifoFast)
|
|
tcmap := nl.DeserializeTcPrioMap(value)
|
|
pfifo.PriorityMap = tcmap.Priomap
|
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pfifo.Bands = uint8(tcmap.Bands)
|
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return nil
|
|
}
|
|
|
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func parsePrioData(qdisc Qdisc, value []byte) error {
|
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prio := qdisc.(*Prio)
|
|
tcmap := nl.DeserializeTcPrioMap(value)
|
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prio.PriorityMap = tcmap.Priomap
|
|
prio.Bands = uint8(tcmap.Bands)
|
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return nil
|
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}
|
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|
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func parseHtbData(qdisc Qdisc, data []syscall.NetlinkRouteAttr) error {
|
|
native = nl.NativeEndian()
|
|
htb := qdisc.(*Htb)
|
|
for _, datum := range data {
|
|
switch datum.Attr.Type {
|
|
case nl.TCA_HTB_INIT:
|
|
opt := nl.DeserializeTcHtbGlob(datum.Value)
|
|
htb.Version = opt.Version
|
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htb.Rate2Quantum = opt.Rate2Quantum
|
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htb.Defcls = opt.Defcls
|
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htb.Debug = opt.Debug
|
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htb.DirectPkts = opt.DirectPkts
|
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case nl.TCA_HTB_DIRECT_QLEN:
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// TODO
|
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//htb.DirectQlen = native.uint32(datum.Value)
|
|
}
|
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}
|
|
return nil
|
|
}
|
|
|
|
func parseFqCodelData(qdisc Qdisc, data []syscall.NetlinkRouteAttr) error {
|
|
native = nl.NativeEndian()
|
|
fqCodel := qdisc.(*FqCodel)
|
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for _, datum := range data {
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|
|
|
switch datum.Attr.Type {
|
|
case nl.TCA_FQ_CODEL_TARGET:
|
|
fqCodel.Target = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_CODEL_LIMIT:
|
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fqCodel.Limit = native.Uint32(datum.Value)
|
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case nl.TCA_FQ_CODEL_INTERVAL:
|
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fqCodel.Interval = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_CODEL_ECN:
|
|
fqCodel.ECN = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_CODEL_FLOWS:
|
|
fqCodel.Flows = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_CODEL_QUANTUM:
|
|
fqCodel.Quantum = native.Uint32(datum.Value)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func parseHfscData(qdisc Qdisc, data []byte) error {
|
|
Hfsc := qdisc.(*Hfsc)
|
|
native = nl.NativeEndian()
|
|
Hfsc.Defcls = native.Uint16(data)
|
|
return nil
|
|
}
|
|
|
|
func parseFqData(qdisc Qdisc, data []syscall.NetlinkRouteAttr) error {
|
|
native = nl.NativeEndian()
|
|
fq := qdisc.(*Fq)
|
|
for _, datum := range data {
|
|
switch datum.Attr.Type {
|
|
case nl.TCA_FQ_BUCKETS_LOG:
|
|
fq.Buckets = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_LOW_RATE_THRESHOLD:
|
|
fq.LowRateThreshold = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_QUANTUM:
|
|
fq.Quantum = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_RATE_ENABLE:
|
|
fq.Pacing = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_INITIAL_QUANTUM:
|
|
fq.InitialQuantum = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_ORPHAN_MASK:
|
|
// TODO
|
|
case nl.TCA_FQ_FLOW_REFILL_DELAY:
|
|
fq.FlowRefillDelay = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_FLOW_PLIMIT:
|
|
fq.FlowPacketLimit = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_PLIMIT:
|
|
fq.PacketLimit = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_FLOW_MAX_RATE:
|
|
fq.FlowMaxRate = native.Uint32(datum.Value)
|
|
case nl.TCA_FQ_FLOW_DEFAULT_RATE:
|
|
fq.FlowDefaultRate = native.Uint32(datum.Value)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func parseNetemData(qdisc Qdisc, value []byte) error {
|
|
netem := qdisc.(*Netem)
|
|
opt := nl.DeserializeTcNetemQopt(value)
|
|
netem.Latency = opt.Latency
|
|
netem.Limit = opt.Limit
|
|
netem.Loss = opt.Loss
|
|
netem.Gap = opt.Gap
|
|
netem.Duplicate = opt.Duplicate
|
|
netem.Jitter = opt.Jitter
|
|
data, err := nl.ParseRouteAttr(value[nl.SizeofTcNetemQopt:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, datum := range data {
|
|
switch datum.Attr.Type {
|
|
case nl.TCA_NETEM_CORR:
|
|
opt := nl.DeserializeTcNetemCorr(datum.Value)
|
|
netem.DelayCorr = opt.DelayCorr
|
|
netem.LossCorr = opt.LossCorr
|
|
netem.DuplicateCorr = opt.DupCorr
|
|
case nl.TCA_NETEM_CORRUPT:
|
|
opt := nl.DeserializeTcNetemCorrupt(datum.Value)
|
|
netem.CorruptProb = opt.Probability
|
|
netem.CorruptCorr = opt.Correlation
|
|
case nl.TCA_NETEM_REORDER:
|
|
opt := nl.DeserializeTcNetemReorder(datum.Value)
|
|
netem.ReorderProb = opt.Probability
|
|
netem.ReorderCorr = opt.Correlation
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func parseTbfData(qdisc Qdisc, data []syscall.NetlinkRouteAttr) error {
|
|
native = nl.NativeEndian()
|
|
tbf := qdisc.(*Tbf)
|
|
for _, datum := range data {
|
|
switch datum.Attr.Type {
|
|
case nl.TCA_TBF_PARMS:
|
|
opt := nl.DeserializeTcTbfQopt(datum.Value)
|
|
tbf.Rate = uint64(opt.Rate.Rate)
|
|
tbf.Peakrate = uint64(opt.Peakrate.Rate)
|
|
tbf.Limit = opt.Limit
|
|
tbf.Buffer = opt.Buffer
|
|
case nl.TCA_TBF_RATE64:
|
|
tbf.Rate = native.Uint64(datum.Value[0:8])
|
|
case nl.TCA_TBF_PRATE64:
|
|
tbf.Peakrate = native.Uint64(datum.Value[0:8])
|
|
case nl.TCA_TBF_PBURST:
|
|
tbf.Minburst = native.Uint32(datum.Value[0:4])
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
const (
|
|
TIME_UNITS_PER_SEC = 1000000
|
|
)
|
|
|
|
var (
|
|
tickInUsec float64
|
|
clockFactor float64
|
|
hz float64
|
|
)
|
|
|
|
func initClock() {
|
|
data, err := ioutil.ReadFile("/proc/net/psched")
|
|
if err != nil {
|
|
return
|
|
}
|
|
parts := strings.Split(strings.TrimSpace(string(data)), " ")
|
|
if len(parts) < 3 {
|
|
return
|
|
}
|
|
var vals [3]uint64
|
|
for i := range vals {
|
|
val, err := strconv.ParseUint(parts[i], 16, 32)
|
|
if err != nil {
|
|
return
|
|
}
|
|
vals[i] = val
|
|
}
|
|
// compatibility
|
|
if vals[2] == 1000000000 {
|
|
vals[0] = vals[1]
|
|
}
|
|
clockFactor = float64(vals[2]) / TIME_UNITS_PER_SEC
|
|
tickInUsec = float64(vals[0]) / float64(vals[1]) * clockFactor
|
|
hz = float64(vals[0])
|
|
}
|
|
|
|
func TickInUsec() float64 {
|
|
if tickInUsec == 0.0 {
|
|
initClock()
|
|
}
|
|
return tickInUsec
|
|
}
|
|
|
|
func ClockFactor() float64 {
|
|
if clockFactor == 0.0 {
|
|
initClock()
|
|
}
|
|
return clockFactor
|
|
}
|
|
|
|
func Hz() float64 {
|
|
if hz == 0.0 {
|
|
initClock()
|
|
}
|
|
return hz
|
|
}
|
|
|
|
func time2Tick(time uint32) uint32 {
|
|
return uint32(float64(time) * TickInUsec())
|
|
}
|
|
|
|
func tick2Time(tick uint32) uint32 {
|
|
return uint32(float64(tick) / TickInUsec())
|
|
}
|
|
|
|
func time2Ktime(time uint32) uint32 {
|
|
return uint32(float64(time) * ClockFactor())
|
|
}
|
|
|
|
func ktime2Time(ktime uint32) uint32 {
|
|
return uint32(float64(ktime) / ClockFactor())
|
|
}
|
|
|
|
func burst(rate uint64, buffer uint32) uint32 {
|
|
return uint32(float64(rate) * float64(tick2Time(buffer)) / TIME_UNITS_PER_SEC)
|
|
}
|
|
|
|
func latency(rate uint64, limit, buffer uint32) float64 {
|
|
return TIME_UNITS_PER_SEC*(float64(limit)/float64(rate)) - float64(tick2Time(buffer))
|
|
}
|
|
|
|
func Xmittime(rate uint64, size uint32) float64 {
|
|
return TickInUsec() * TIME_UNITS_PER_SEC * (float64(size) / float64(rate))
|
|
}
|