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|
// jumbo-frames is simple example how to send larger and larger jumbo packets with libmemif adapter. This is simple copy
// of raw-data but with sending larger packets, so for more information read its code and docs.
package main
import (
"fmt"
"os"
"os/signal"
"sync"
"time"
"git.fd.io/govpp.git/extras/libmemif"
)
const (
Socket = "/tmp/jumbo-frames-example"
Secret = "secret"
ConnectionID = 1
NumQueues uint8 = 3
)
var wg sync.WaitGroup
var stopCh chan struct{}
func OnConnect(memif *libmemif.Memif) (err error) {
details, err := memif.GetDetails()
if err != nil {
fmt.Printf("libmemif.GetDetails() error: %v\n", err)
}
fmt.Printf("memif %s has been connected: %+v\n", memif.IfName, details)
stopCh = make(chan struct{})
var i uint8
for i = 0; i < uint8(len(details.RxQueues)); i++ {
wg.Add(1)
go ReadAndPrintPackets(memif, i)
}
for i = 0; i < uint8(len(details.TxQueues)); i++ {
wg.Add(1)
go SendPackets(memif, i)
}
return nil
}
func OnDisconnect(memif *libmemif.Memif) (err error) {
fmt.Printf("memif %s has been disconnected\n", memif.IfName)
close(stopCh)
wg.Wait()
return nil
}
func ReadAndPrintPackets(memif *libmemif.Memif, queueID uint8) {
defer wg.Done()
interruptCh, err := memif.GetQueueInterruptChan(queueID)
if err != nil {
switch err {
case libmemif.ErrQueueID:
fmt.Printf("libmemif.Memif.GetQueueInterruptChan() complains about invalid queue id!?")
default:
fmt.Printf("libmemif.Memif.GetQueueInterruptChan() error: %v\n", err)
}
return
}
counter := 0
for {
select {
case <-interruptCh:
counter++
for {
packets, err := memif.RxBurst(queueID, 10)
if err != nil {
fmt.Printf("libmemif.Memif.RxBurst() error: %v\n", err)
} else {
if len(packets) == 0 {
break
}
for _, packet := range packets {
fmt.Printf("Received packet queue=%d: %v in burst %d\n", queueID, len(packet), counter)
}
}
}
case <-stopCh:
return
}
}
}
func SendPackets(memif *libmemif.Memif, queueID uint8) {
defer wg.Done()
counter := 0
for {
select {
case <-time.After(3 * time.Second):
counter++
packetMul := counter % 100 + 1 // Limit max iterations to 100 to not go out of bounds
packets := []libmemif.RawPacketData{
make([]byte, 128*packetMul),
make([]byte, 256*packetMul),
make([]byte, 512*packetMul),
}
sent := 0
for {
count, err := memif.TxBurst(queueID, packets[sent:])
if err != nil {
fmt.Printf("libmemif.Memif.TxBurst() error: %v\n", err)
break
} else {
fmt.Printf("libmemif.Memif.TxBurst() has sent %d packets in burst %v.\n", count, counter)
sent += int(count)
if sent == len(packets) {
break
}
}
}
case <-stopCh:
return
}
}
}
func main() {
var isMaster = true
var appSuffix string
if len(os.Args) > 1 && (os.Args[1] == "--slave" || os.Args[1] == "-slave") {
isMaster = false
appSuffix = "-slave"
}
appName := "jumbo-frames" + appSuffix
fmt.Println("Initializing libmemif as ", appName)
err := libmemif.Init(appName)
if err != nil {
fmt.Printf("libmemif.Init() error: %v\n", err)
return
}
defer libmemif.Cleanup()
memifCallbacks := &libmemif.MemifCallbacks{
OnConnect: OnConnect,
OnDisconnect: OnDisconnect,
}
memifConfig := &libmemif.MemifConfig{
MemifMeta: libmemif.MemifMeta{
IfName: "memif1",
ConnID: ConnectionID,
SocketFilename: Socket,
Secret: Secret,
IsMaster: isMaster,
Mode: libmemif.IfModeEthernet,
},
MemifShmSpecs: libmemif.MemifShmSpecs{
NumRxQueues: NumQueues,
NumTxQueues: NumQueues,
BufferSize: 2048,
Log2RingSize: 10,
},
}
fmt.Printf("Callbacks: %+v\n", memifCallbacks)
fmt.Printf("Config: %+v\n", memifConfig)
memif, err := libmemif.CreateInterface(memifConfig, memifCallbacks)
if err != nil {
fmt.Printf("libmemif.CreateInterface() error: %v\n", err)
return
}
defer memif.Close()
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt)
<-sigChan
}
|
