linux/samples/pktgen/pktgen_sample03_burst_single_flow.sh
J.J. Martzki a27ac53909 samples: pktgen: fix append mode failed issue
Each sample script sources functions.sh before parameters.sh
which makes $APPEND undefined when trapping EXIT no matter in
append mode or not. Due to this when sample scripts finished
they always do "pgctrl reset" which resets pktgen config.

So move trap to each script after sourcing parameters.sh
and trap EXIT explicitly.

Signed-off-by: J.J. Martzki <mars14850@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2023-07-03 09:15:26 +01:00

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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Script for max single flow performance
# - If correctly tuned[1], single CPU 10G wirespeed small pkts is possible[2]
#
# Using pktgen "burst" option (use -b $N)
# - To boost max performance
# - Avail since: kernel v3.18
# * commit 38b2cf2982dc73 ("net: pktgen: packet bursting via skb->xmit_more")
# - This avoids writing the HW tailptr on every driver xmit
# - The performance boost is impressive, see commit and blog [2]
#
# Notice: On purpose generates a single (UDP) flow towards target,
# reason behind this is to only overload/activate a single CPU on
# target host. And no randomness for pktgen also makes it faster.
#
# Tuning see:
# [1] http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html
# [2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html
#
basedir=`dirname $0`
source ${basedir}/functions.sh
root_check_run_with_sudo "$@"
# Parameter parsing via include
source ${basedir}/parameters.sh
# Trap EXIT first
trap_exit
# Set some default params, if they didn't get set
if [ -z "$DEST_IP" ]; then
[ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
fi
[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
[ -z "$BURST" ] && BURST=32
[ -z "$CLONE_SKB" ] && CLONE_SKB="0" # No need for clones when bursting
[ -z "$COUNT" ] && COUNT="0" # Zero means indefinitely
if [ -n "$DEST_IP" ]; then
validate_addr${IP6} $DEST_IP
read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP)
fi
if [ -n "$DST_PORT" ]; then
read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT)
validate_ports $UDP_DST_MIN $UDP_DST_MAX
fi
# General cleanup everything since last run
[ -z "$APPEND" ] && pg_ctrl "reset"
# Threads are specified with parameter -t value in $THREADS
for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
dev=${DEV}@${thread}
# Add remove all other devices and add_device $dev to thread
[ -z "$APPEND" ] && pg_thread $thread "rem_device_all"
pg_thread $thread "add_device" $dev
# Base config
pg_set $dev "flag QUEUE_MAP_CPU"
pg_set $dev "count $COUNT"
pg_set $dev "clone_skb $CLONE_SKB"
pg_set $dev "pkt_size $PKT_SIZE"
pg_set $dev "delay $DELAY"
pg_set $dev "flag NO_TIMESTAMP"
# Destination
pg_set $dev "dst_mac $DST_MAC"
pg_set $dev "dst${IP6}_min $DST_MIN"
pg_set $dev "dst${IP6}_max $DST_MAX"
if [ -n "$DST_PORT" ]; then
# Single destination port or random port range
pg_set $dev "flag UDPDST_RND"
pg_set $dev "udp_dst_min $UDP_DST_MIN"
pg_set $dev "udp_dst_max $UDP_DST_MAX"
fi
[ ! -z "$UDP_CSUM" ] && pg_set $dev "flag UDPCSUM"
# Setup burst, for easy testing -b 0 disable bursting
# (internally in pktgen default and minimum burst=1)
if [[ ${BURST} -ne 0 ]]; then
pg_set $dev "burst $BURST"
else
info "$dev: Not using burst"
fi
done
# Run if user hits control-c
function print_result() {
# Print results
for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
dev=${DEV}@${thread}
echo "Device: $dev"
cat /proc/net/pktgen/$dev | grep -A2 "Result:"
done
}
# trap keyboard interrupt (Ctrl-C)
trap true SIGINT
if [ -z "$APPEND" ]; then
echo "Running... ctrl^C to stop" >&2
pg_ctrl "start"
print_result
else
echo "Append mode: config done. Do more or use 'pg_ctrl start' to run"
fi