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- #!/bin/sh
- # SPDX-License-Identifier: GPL-2.0-or-later
- # Copyright (c) 2017-2019 Petr Vorel <pvorel@suse.cz>
- # Copyright (c) 2015-2017 Oracle and/or its affiliates. All Rights Reserved.
- # Copyright (c) International Business Machines Corp., 2005
- # Author: Mitsuru Chinen <mitch@jp.ibm.com>
- IF_CMD='ifconfig'
- TST_SETUP="do_setup"
- TST_CLEANUP="do_cleanup"
- . if-lib.sh
- # The interval of the mtu change [second]
- CHANGE_INTERVAL=${CHANGE_INTERVAL:-5}
- TST_TIMEOUT=$(((CHANGE_INTERVAL + 30) * MTU_CHANGE_TIMES))
- # The array of the value which MTU is changed into sequentially
- # 552 - net.ipv4.route.min_pmtu
- CHANGE_VALUES="784 1142 552 1500 552 1500 552 748 552 1142 1500"
- CHANGE6_VALUES="1280 1445 1335 1390 1500 1280 1500 1280 1335 1500"
- saved_mtu=
- do_setup()
- {
- [ "$TST_IPV6" ] && CHANGE_VALUES=$CHANGE6_VALUES
- if_setup
- saved_mtu="$(cat /sys/class/net/$(tst_iface)/mtu)"
- }
- do_cleanup()
- {
- if_cleanup_restore
- if [ "$saved_mtu" ]; then
- ip li set $(tst_iface) mtu $saved_mtu
- tst_rhost_run -c "ip li set $(tst_iface rhost) mtu $saved_mtu"
- fi
- }
- test_body()
- {
- local cmd="$CMD"
- local iface=$(tst_iface)
- local iface_rmt=$(tst_iface rhost)
- [ "$TST_IPV6" ] && local netmask=64 || local netmask=16
- tst_res TINFO "'$cmd' changes MTU $MTU_CHANGE_TIMES times" \
- "every $CHANGE_INTERVAL seconds"
- mtu_array_len=$(echo $CHANGE_VALUES | wc -w)
- local cnt=0
- while [ $cnt -lt $MTU_CHANGE_TIMES ]; do
- local nth=$(($cnt % $mtu_array_len))
- field=$(($nth + 1))
- cnt=$(($cnt + 1))
- mtu=$(echo $CHANGE_VALUES | cut -d ' ' -f $field)
- [ $cnt -eq $MTU_CHANGE_TIMES ] && mtu="$saved_mtu"
- make_background_tcp_traffic
- tst_res TINFO "set MTU to $mtu $cnt/$MTU_CHANGE_TIMES"
- local ret=0
- case $cmd in
- ifconfig) ifconfig $iface mtu $mtu || ret=1
- tst_rhost_run -c "ifconfig $iface_rmt mtu $mtu"
- ;;
- ip) ip link set $iface mtu $mtu || ret=1
- tst_rhost_run -c "ip link set $iface_rmt mtu $mtu"
- ;;
- esac
- if [ $? -ne 0 -o $ret -ne 0 ]; then
- tst_res TFAIL "Failed to change the mtu at $cnt time"
- return
- fi
- tst_sleep $CHANGE_INTERVAL
- tst_ping $(tst_ipaddr) $(tst_ipaddr rhost) "1 1000 65507"
- done
- }
- tst_run
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