#!/bin/bash
#
# Simple example:
#  * pktgen sending with single thread and single interface
#  * flow variation via random UDP source port
#
setglobal basedir = $[dirname $0]
source $(basedir)/functions.sh
root_check_run_with_sudo @Argv

# Parameter parsing via include
# - go look in parameters.sh to see which setting are avail
# - required param is the interface "-i" stored in $DEV
source $(basedir)/parameters.sh
#
# Set some default params, if they didn't get set
if test -z $DEST_IP {
    test -z $IP6 && setglobal DEST_IP = '"198.18.0.42'" || setglobal DEST_IP = '"FD00::1'"
}
test -z $CLONE_SKB && setglobal CLONE_SKB = '"0'"
# Example enforce param "-m" for dst_mac
test -z $DST_MAC && usage && err 2 "Must specify -m dst_mac"

# Base Config
setglobal DELAY = '"0'"        # Zero means max speed
setglobal COUNT = '"100000'"   # Zero means indefinitely

# Flow variation random source port between min and max
setglobal UDP_MIN = '9'
setglobal UDP_MAX = '109'

# General cleanup everything since last run
# (especially important if other threads were configured by other scripts)
pg_ctrl "reset"

# Add remove all other devices and add_device $DEV to thread 0
setglobal thread = '0'
pg_thread $thread "rem_device_all"
pg_thread $thread "add_device" $DEV

# How many packets to send (zero means indefinitely)
pg_set $DEV "count $COUNT"

# Reduce alloc cost by sending same SKB many times
# - this obviously affects the randomness within the packet
pg_set $DEV "clone_skb $CLONE_SKB"

# Set packet size
pg_set $DEV "pkt_size $PKT_SIZE"

# Delay between packets (zero means max speed)
pg_set $DEV "delay $DELAY"

# Flag example disabling timestamping
pg_set $DEV "flag NO_TIMESTAMP"

# Destination
pg_set $DEV "dst_mac $DST_MAC"
pg_set $DEV "dst$IP6 $DEST_IP"

# Setup random UDP port src range
pg_set $DEV "flag UDPSRC_RND"
pg_set $DEV "udp_src_min $UDP_MIN"
pg_set $DEV "udp_src_max $UDP_MAX"

# start_run
echo "Running... ctrl^C to stop" > !2
pg_ctrl "start"
echo "Done" > !2

# Print results
echo "Result device: $DEV"
cat /proc/net/pktgen/$DEV