selftests: add script to stress-test nft packet path vs. control plane

TARGETS += mount

TARGETS += mqueue

TARGETS += net

TARGETS += netfilter

TARGETS += nsfs

TARGETS += powerpc

TARGETS += proc

# SPDX-License-Identifier: GPL-2.0

# Makefile for netfilter selftests

TEST_PROGS := nft_trans_stress.sh

include ../lib.mk

CONFIG_NET_NS=y

NF_TABLES_INET=y

#!/bin/bash

#

# This test is for stress-testing the nf_tables config plane path vs.

# packet path processing: Make sure we never release rules that are

# still visible to other cpus.

#

# set -e

# Kselftest framework requirement - SKIP code is 4.

ksft_skip=4

testns=testns1

tables="foo bar baz quux"

nft --version > /dev/null 2>&1

if [ $? -ne 0 ];then

	echo "SKIP: Could not run test without nft tool"

	exit $ksft_skip

fi

ip -Version > /dev/null 2>&1

if [ $? -ne 0 ];then

	echo "SKIP: Could not run test without ip tool"

	exit $ksft_skip

fi

tmp=$(mktemp)

for table in $tables; do

	echo add table inet "$table" >> "$tmp"

	echo flush table inet "$table" >> "$tmp"

	echo "add chain inet $table INPUT { type filter hook input priority 0; }" >> "$tmp"

	echo "add chain inet $table OUTPUT { type filter hook output priority 0; }" >> "$tmp"

	for c in $(seq 1 400); do

		chain=$(printf "chain%03u" "$c")

		echo "add chain inet $table $chain" >> "$tmp"

	done

	for c in $(seq 1 400); do

		chain=$(printf "chain%03u" "$c")

		for BASE in INPUT OUTPUT; do

			echo "add rule inet $table $BASE counter jump $chain" >> "$tmp"

		done

		echo "add rule inet $table $chain counter return" >> "$tmp"

	done

done

ip netns add "$testns"

ip -netns "$testns" link set lo up

lscpu | grep ^CPU\(s\): | ( read cpu cpunum ;

cpunum=$((cpunum-1))

for i in $(seq 0 $cpunum);do

	mask=$(printf 0x%x $((1<<$i)))

        ip netns exec "$testns" taskset $mask ping -4 127.0.0.1 -fq > /dev/null &

        ip netns exec "$testns" taskset $mask ping -6 ::1 -fq > /dev/null &

done)

sleep 1

for i in $(seq 1 10) ; do ip netns exec "$testns" nft -f "$tmp" & done

for table in $tables;do

	randsleep=$((RANDOM%10))

	sleep $randsleep

	ip netns exec "$testns" nft delete table inet $table 2>/dev/null

done

randsleep=$((RANDOM%10))

sleep $randsleep

pkill -9 ping

wait

rm -f "$tmp"

ip netns del "$testns"