#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# This test installs a TC bpf program that throttles a TCP flow
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# with dst port = 9000 down to 5MBps. Then it measures actual
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# throughput of the flow.
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if [[ $EUID -ne 0 ]]; then
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echo "This script must be run as root"
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echo "FAIL"
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exit 1
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fi
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# check that nc, dd, and timeout are present
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command -v nc >/dev/null 2>&1 || \
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{ echo >&2 "nc is not available"; exit 1; }
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command -v dd >/dev/null 2>&1 || \
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{ echo >&2 "nc is not available"; exit 1; }
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command -v timeout >/dev/null 2>&1 || \
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{ echo >&2 "timeout is not available"; exit 1; }
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readonly NS_SRC="ns-src-$(mktemp -u XXXXXX)"
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readonly NS_DST="ns-dst-$(mktemp -u XXXXXX)"
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readonly IP_SRC="172.16.1.100"
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readonly IP_DST="172.16.2.100"
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cleanup()
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{
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ip netns del ${NS_SRC}
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ip netns del ${NS_DST}
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}
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trap cleanup EXIT
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set -e # exit on error
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ip netns add "${NS_SRC}"
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ip netns add "${NS_DST}"
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ip link add veth_src type veth peer name veth_dst
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ip link set veth_src netns ${NS_SRC}
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ip link set veth_dst netns ${NS_DST}
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ip -netns ${NS_SRC} addr add ${IP_SRC}/24 dev veth_src
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ip -netns ${NS_DST} addr add ${IP_DST}/24 dev veth_dst
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ip -netns ${NS_SRC} link set dev veth_src up
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ip -netns ${NS_DST} link set dev veth_dst up
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ip -netns ${NS_SRC} route add ${IP_DST}/32 dev veth_src
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ip -netns ${NS_DST} route add ${IP_SRC}/32 dev veth_dst
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# set up TC on TX
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ip netns exec ${NS_SRC} tc qdisc add dev veth_src root fq
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ip netns exec ${NS_SRC} tc qdisc add dev veth_src clsact
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ip netns exec ${NS_SRC} tc filter add dev veth_src egress \
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bpf da obj test_tc_edt.o sec cls_test
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# start the listener
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ip netns exec ${NS_DST} bash -c \
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"nc -4 -l -p 9000 >/dev/null &"
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declare -i NC_PID=$!
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sleep 1
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declare -ir TIMEOUT=20
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declare -ir EXPECTED_BPS=5000000
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# run the load, capture RX bytes on DST
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declare -ir RX_BYTES_START=$( ip netns exec ${NS_DST} \
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cat /sys/class/net/veth_dst/statistics/rx_bytes )
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set +e
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ip netns exec ${NS_SRC} bash -c "timeout ${TIMEOUT} dd if=/dev/zero \
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bs=1000 count=1000000 > /dev/tcp/${IP_DST}/9000 2>/dev/null"
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set -e
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declare -ir RX_BYTES_END=$( ip netns exec ${NS_DST} \
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cat /sys/class/net/veth_dst/statistics/rx_bytes )
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declare -ir ACTUAL_BPS=$(( ($RX_BYTES_END - $RX_BYTES_START) / $TIMEOUT ))
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echo $TIMEOUT $ACTUAL_BPS $EXPECTED_BPS | \
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awk '{printf "elapsed: %d sec; bps difference: %.2f%%\n",
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$1, ($2-$3)*100.0/$3}'
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# Pass the test if the actual bps is within 1% of the expected bps.
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# The difference is usually about 0.1% on a 20-sec test, and ==> zero
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# the longer the test runs.
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declare -ir RES=$( echo $ACTUAL_BPS $EXPECTED_BPS | \
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awk 'function abs(x){return ((x < 0.0) ? -x : x)}
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{if (abs(($1-$2)*100.0/$2) > 1.0) { print "1" }
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else { print "0"} }' )
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if [ "${RES}" == "0" ] ; then
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echo "PASS"
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else
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echo "FAIL"
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exit 1
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fi
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