1#!/bin/sh 2# Copyright (c) 2015-2017 Oracle and/or its affiliates. All Rights Reserved. 3# Copyright (c) International Business Machines Corp., 2005 4# 5# This program is free software; you can redistribute it and/or 6# modify it under the terms of the GNU General Public License as 7# published by the Free Software Foundation; either version 2 of 8# the License, or (at your option) any later version. 9# 10# This program is distributed in the hope that it would be useful, 11# but WITHOUT ANY WARRANTY; without even the implied warranty of 12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13# GNU General Public License for more details. 14# 15# You should have received a copy of the GNU General Public License 16# along with this program. If not, see <http://www.gnu.org/licenses/>. 17# 18# Author: Mitsuru Chinen <mitch@jp.ibm.com> 19 20TST_TOTAL=2 21TCID=if-mtu-change 22 23. if-lib.sh 24 25TST_CLEANUP="do_cleanup" 26 27# The interval of the mtu change [second] 28CHANGE_INTERVAL=${CHANGE_INTERVAL:-5} 29# The array of the value which MTU is changed into sequentially 30# 552 - net.ipv4.route.min_pmtu 31CHANGE_VALUES="784 1142 552 1500 552 1500 552 748 552 1142 1500" 32CHANGE6_VALUES="1280 1445 1335 1390 1500 1280 1500 1280 1335 1500" 33[ "$TST_IPV6" ] && CHANGE_VALUES=$CHANGE6_VALUES 34saved_mtu= 35 36do_cleanup() 37{ 38 cleanup 39 if [ "$saved_mtu" ]; then 40 ip li set $(tst_iface) mtu $saved_mtu 41 tst_rhost_run -c "ip li set $(tst_iface rhost) mtu $saved_mtu" 42 fi 43 tst_restore_ipaddr 44 tst_restore_ipaddr rhost 45 tst_wait_ipv6_dad 46} 47 48test_body() 49{ 50 local cmd_type=$1 51 52 case $cmd_type in 53 if_cmd) local cmd_name='ifconfig' ;; 54 ip_cmd) local cmd_name='ip' ;; 55 *) tst_brkm TBROK "Unknown test parameter '$cmd_type'" 56 esac 57 58 local iface=$(tst_iface) 59 local iface_rmt=$(tst_iface rhost) 60 [ "$TST_IPV6" ] && local netmask=64 || local netmask=16 61 62 tst_resm TINFO "'$cmd_name changes MTU $MTU_CHANGE_TIMES times " \ 63 "every $CHANGE_INTERVAL seconds" 64 65 make_background_tcp_traffic 66 67 mtu_array_len=$(echo $CHANGE_VALUES | wc -w) 68 local cnt=0 69 while [ $cnt -lt $MTU_CHANGE_TIMES ]; do 70 local nth=$(($cnt % $mtu_array_len)) 71 field=$(($nth + 1)) 72 cnt=$(($cnt + 1)) 73 mtu=$(echo $CHANGE_VALUES | cut -d ' ' -f $field) 74 [ $cnt -eq $MTU_CHANGE_TIMES ] && mtu="$saved_mtu" 75 76 tst_resm TINFO "set MTU to $mtu $cnt/$MTU_CHANGE_TIMES" 77 local ret=0 78 case $cmd_type in 79 if_cmd) ifconfig $iface mtu $mtu || ret=1 80 tst_rhost_run -c "ifconfig $iface_rmt mtu $mtu" 81 ;; 82 ip_cmd) ip link set $iface mtu $mtu || ret=1 83 tst_rhost_run -c "ip link set $iface_rmt mtu $mtu" 84 ;; 85 esac 86 87 if [ $? -ne 0 -o $ret -ne 0 ]; then 88 tst_resm TFAIL "Failed to change the mtu at $cnt time" 89 return 90 fi 91 92 tst_sleep $CHANGE_INTERVAL 93 94 EXPECT_PASS tst_ping $(tst_ipaddr) $(tst_ipaddr rhost) "1 1000 65507" 95 96 # Check the background TCP traffic 97 pgrep -x netstress > /dev/null || make_background_tcp_traffic 98 done 99} 100 101setup 102 103tst_check_cmds ifconfig 104 105saved_mtu="$(cat /sys/class/net/$(tst_iface)/mtu)" 106 107test_body 'if_cmd' 108test_body 'ip_cmd' 109 110tst_exit 111