1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 4# This test installs a TC bpf program that throttles a TCP flow 5# with dst port = 9000 down to 5MBps. Then it measures actual 6# throughput of the flow. 7 8BPF_FILE="test_tc_edt.bpf.o" 9if [[ $EUID -ne 0 ]]; then 10 echo "This script must be run as root" 11 echo "FAIL" 12 exit 1 13fi 14 15# check that nc, dd, and timeout are present 16command -v nc >/dev/null 2>&1 || \ 17 { echo >&2 "nc is not available"; exit 1; } 18command -v dd >/dev/null 2>&1 || \ 19 { echo >&2 "nc is not available"; exit 1; } 20command -v timeout >/dev/null 2>&1 || \ 21 { echo >&2 "timeout is not available"; exit 1; } 22 23readonly NS_SRC="ns-src-$(mktemp -u XXXXXX)" 24readonly NS_DST="ns-dst-$(mktemp -u XXXXXX)" 25 26readonly IP_SRC="172.16.1.100" 27readonly IP_DST="172.16.2.100" 28 29cleanup() 30{ 31 ip netns del ${NS_SRC} 32 ip netns del ${NS_DST} 33} 34 35trap cleanup EXIT 36 37set -e # exit on error 38 39ip netns add "${NS_SRC}" 40ip netns add "${NS_DST}" 41ip link add veth_src type veth peer name veth_dst 42ip link set veth_src netns ${NS_SRC} 43ip link set veth_dst netns ${NS_DST} 44 45ip -netns ${NS_SRC} addr add ${IP_SRC}/24 dev veth_src 46ip -netns ${NS_DST} addr add ${IP_DST}/24 dev veth_dst 47 48ip -netns ${NS_SRC} link set dev veth_src up 49ip -netns ${NS_DST} link set dev veth_dst up 50 51ip -netns ${NS_SRC} route add ${IP_DST}/32 dev veth_src 52ip -netns ${NS_DST} route add ${IP_SRC}/32 dev veth_dst 53 54# set up TC on TX 55ip netns exec ${NS_SRC} tc qdisc add dev veth_src root fq 56ip netns exec ${NS_SRC} tc qdisc add dev veth_src clsact 57ip netns exec ${NS_SRC} tc filter add dev veth_src egress \ 58 bpf da obj ${BPF_FILE} sec cls_test 59 60 61# start the listener 62ip netns exec ${NS_DST} bash -c \ 63 "nc -4 -l -p 9000 >/dev/null &" 64declare -i NC_PID=$! 65sleep 1 66 67declare -ir TIMEOUT=20 68declare -ir EXPECTED_BPS=5000000 69 70# run the load, capture RX bytes on DST 71declare -ir RX_BYTES_START=$( ip netns exec ${NS_DST} \ 72 cat /sys/class/net/veth_dst/statistics/rx_bytes ) 73 74set +e 75ip netns exec ${NS_SRC} bash -c "timeout ${TIMEOUT} dd if=/dev/zero \ 76 bs=1000 count=1000000 > /dev/tcp/${IP_DST}/9000 2>/dev/null" 77set -e 78 79declare -ir RX_BYTES_END=$( ip netns exec ${NS_DST} \ 80 cat /sys/class/net/veth_dst/statistics/rx_bytes ) 81 82declare -ir ACTUAL_BPS=$(( ($RX_BYTES_END - $RX_BYTES_START) / $TIMEOUT )) 83 84echo $TIMEOUT $ACTUAL_BPS $EXPECTED_BPS | \ 85 awk '{printf "elapsed: %d sec; bps difference: %.2f%%\n", 86 $1, ($2-$3)*100.0/$3}' 87 88# Pass the test if the actual bps is within 1% of the expected bps. 89# The difference is usually about 0.1% on a 20-sec test, and ==> zero 90# the longer the test runs. 91declare -ir RES=$( echo $ACTUAL_BPS $EXPECTED_BPS | \ 92 awk 'function abs(x){return ((x < 0.0) ? -x : x)} 93 {if (abs(($1-$2)*100.0/$2) > 1.0) { print "1" } 94 else { print "0"} }' ) 95if [ "${RES}" == "0" ] ; then 96 echo "PASS" 97else 98 echo "FAIL" 99 exit 1 100fi 101