1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0-or-later 3# Copyright (c) 2017-2019 Petr Vorel <pvorel@suse.cz> 4# Copyright (c) 2015-2017 Oracle and/or its affiliates. All Rights Reserved. 5# Copyright (c) International Business Machines Corp., 2005 6# Author: Mitsuru Chinen <mitch@jp.ibm.com> 7 8IF_CMD='ifconfig' 9TST_SETUP="do_setup" 10TST_CLEANUP="do_cleanup" 11. if-lib.sh 12 13# The interval of the mtu change [second] 14CHANGE_INTERVAL=${CHANGE_INTERVAL:-5} 15 16TST_TIMEOUT=$(((CHANGE_INTERVAL + 30) * MTU_CHANGE_TIMES)) 17 18# The array of the value which MTU is changed into sequentially 19# 552 - net.ipv4.route.min_pmtu 20CHANGE_VALUES="784 1142 552 1500 552 1500 552 748 552 1142 1500" 21CHANGE6_VALUES="1280 1445 1335 1390 1500 1280 1500 1280 1335 1500" 22saved_mtu= 23 24do_setup() 25{ 26 [ "$TST_IPV6" ] && CHANGE_VALUES=$CHANGE6_VALUES 27 if_setup 28 saved_mtu="$(cat /sys/class/net/$(tst_iface)/mtu)" 29} 30 31do_cleanup() 32{ 33 if_cleanup_restore 34 if [ "$saved_mtu" ]; then 35 ip li set $(tst_iface) mtu $saved_mtu 36 tst_rhost_run -c "ip li set $(tst_iface rhost) mtu $saved_mtu" 37 fi 38} 39 40test_body() 41{ 42 local cmd="$CMD" 43 44 local iface=$(tst_iface) 45 local iface_rmt=$(tst_iface rhost) 46 [ "$TST_IPV6" ] && local netmask=64 || local netmask=16 47 48 tst_res TINFO "'$cmd' changes MTU $MTU_CHANGE_TIMES times" \ 49 "every $CHANGE_INTERVAL seconds" 50 51 mtu_array_len=$(echo $CHANGE_VALUES | wc -w) 52 local cnt=0 53 while [ $cnt -lt $MTU_CHANGE_TIMES ]; do 54 local nth=$(($cnt % $mtu_array_len)) 55 field=$(($nth + 1)) 56 cnt=$(($cnt + 1)) 57 mtu=$(echo $CHANGE_VALUES | cut -d ' ' -f $field) 58 [ $cnt -eq $MTU_CHANGE_TIMES ] && mtu="$saved_mtu" 59 60 make_background_tcp_traffic 61 62 tst_res TINFO "set MTU to $mtu $cnt/$MTU_CHANGE_TIMES" 63 local ret=0 64 case $cmd in 65 ifconfig) ifconfig $iface mtu $mtu || ret=1 66 tst_rhost_run -c "ifconfig $iface_rmt mtu $mtu" 67 ;; 68 ip) ip link set $iface mtu $mtu || ret=1 69 tst_rhost_run -c "ip link set $iface_rmt mtu $mtu" 70 ;; 71 esac 72 73 if [ $? -ne 0 -o $ret -ne 0 ]; then 74 tst_res TFAIL "Failed to change the mtu at $cnt time" 75 return 76 fi 77 78 tst_sleep $CHANGE_INTERVAL 79 80 tst_ping $(tst_ipaddr) $(tst_ipaddr rhost) "1 1000 65507" 81 done 82} 83 84tst_run 85