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README.md

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 # pktgen
+
+Pktgen.sh is a script to use Linux pktgen module to generate packet. this example script has been tested on Ubuntu 18.04. 
+the script hard code the ip and mac address, please change it as your testing environment. 
+
+# Requirement 
+Change the RX and TX setting of the testing NIC.   
+>ethtool -C enp68s0f1 rx-usecs 30
+>ethtool -G enp68s0f1 rx 4096
+>ethtool -G enp68s0f1 tx 4096
+>ip link set enp68s0f1 mtu 9014
+
+# Usage
+./pktgen.sh enp68s0f1 9000
+
+# Note
+Suggested to consider the cpu affinity, and you have to check the NUMA node of the testing NIC.
+

pktgen.sh

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+#! /bin/bash
+set +e
+
+#modprobe pktgen
+
+if [[ `lsmod | grep pktgen` == "" ]];then
+   modprobe pktgen
+fi
+
+if [[ $1 == "" ]];then
+	echo "need a device!"
+	exit
+else
+	devif=$1
+fi
+
+if [[ $2 == "" ]];then
+   pktsize=1500
+else
+   pktsize=$2
+fi
+
+function pgset() {
+    local result
+
+    echo $1 > $PGDEV
+
+    result=`cat $PGDEV | fgrep "Result: OK:"`
+    if [ "$result" = "" ]; then
+         cat $PGDEV | fgrep Result:
+    fi
+}
+
+function pg() {
+    echo inject > $PGDEV
+    cat $PGDEV
+}
+
+# On UP systems only one thread exists -- so just add devices
+# We use ens3, ens3
+
+PGDEV=/proc/net/pktgen/pgctrl
+pgset "reset"
+
+echo "Adding devices to run".
+PGDEV=/proc/net/pktgen/kpktgend_1
+pgset "rem_device_all"
+pgset "add_device $devif"
+#pgset "max_before_softirq 1000"
+
+# Configure the individual devices
+echo "Configuring devices"
+
+PGDEV=/proc/net/pktgen/$devif
+pgset "clone_skb 1000"
+pgset "delay 0"
+pgset "pkt_size $pktsize"
+pgset "min_pkt_size $pktsize"
+pgset "max_pkt_size $pktsize"
+#pgset "rate 10G"
+pgset "src_mac 90:e2:ba:83:81:85"
+pgset "flag IPSRC_RND"
+pgset "src_min 192.168.1.11"
+pgset "dst 192.168.1.12"
+pgset "dst_mac 90:e2:ba:8a:30:11"
+pgset "count 0"
+
+# Time to run
+
+PGDEV=/proc/net/pktgen/pgctrl
+echo "pkgsize:$pktsize"
+echo "Running... ctrl^C to stop"
+
+pgset "start"
+
+echo "Done"