270 lines · bash
1#!/bin/bash2# SPDX-License-Identifier: GPL-2.03 4# Test for DSCP prioritization in the router.5#6# With ip_forward_update_priority disabled, the packets are expected to keep7# their DSCP (which in this test uses only values 0..7) intact as they are8# forwarded by the switch. That is verified at $h2. ICMP responses are formed9# with the same DSCP as the requests, and likewise pass through the switch10# intact, which is verified at $h1.11#12# With ip_forward_update_priority enabled, router reprioritizes the packets13# according to the table in reprioritize(). Thus, say, DSCP 7 maps to priority14# 4, which on egress maps back to DSCP 4. The response packet then gets15# reprioritized to 6, getting DSCP 6 on egress.16#17# +----------------------+ +----------------------+18# | H1 | | H2 |19# | + $h1 | | $h2 + |20# | | 192.0.2.1/28 | | 192.0.2.18/28 | |21# +----|-----------------+ +----------------|-----+22# | |23# +----|----------------------------------------------------------------|-----+24# | SW | | |25# | + $swp1 $swp2 + |26# | 192.0.2.2/28 192.0.2.17/28 |27# | APP=0,5,0 .. 7,5,7 APP=0,5,0 .. 7,5,7 |28# +---------------------------------------------------------------------------+29 30ALL_TESTS="31 ping_ipv432 test_update33 test_no_update34 test_pedit_norewrite35 test_dscp_leftover36"37 38lib_dir=$(dirname $0)/../../../net/forwarding39 40NUM_NETIFS=441source $lib_dir/lib.sh42 43reprioritize()44{45 local in=$1; shift46 47 # This is based on rt_tos2priority in include/net/route.h. Assuming 1:148 # mapping between priorities and TOS, it yields a new priority for a49 # packet with ingress priority of $in.50 local -a reprio=(0 0 2 2 6 6 4 4)51 52 echo ${reprio[$in]}53}54 55zero()56{57 echo 058}59 60three()61{62 echo 363}64 65h1_create()66{67 simple_if_init $h1 192.0.2.1/2868 tc qdisc add dev $h1 clsact69 dscp_capture_install $h1 070 ip route add vrf v$h1 192.0.2.16/28 via 192.0.2.271}72 73h1_destroy()74{75 ip route del vrf v$h1 192.0.2.16/28 via 192.0.2.276 dscp_capture_uninstall $h1 077 tc qdisc del dev $h1 clsact78 simple_if_fini $h1 192.0.2.1/2879}80 81h2_create()82{83 simple_if_init $h2 192.0.2.18/2884 tc qdisc add dev $h2 clsact85 dscp_capture_install $h2 086 ip route add vrf v$h2 192.0.2.0/28 via 192.0.2.1787}88 89h2_destroy()90{91 ip route del vrf v$h2 192.0.2.0/28 via 192.0.2.1792 dscp_capture_uninstall $h2 093 tc qdisc del dev $h2 clsact94 simple_if_fini $h2 192.0.2.18/2895}96 97switch_create()98{99 simple_if_init $swp1 192.0.2.2/28100 __simple_if_init $swp2 v$swp1 192.0.2.17/28101 102 tc qdisc add dev $swp1 clsact103 tc qdisc add dev $swp2 clsact104 105 dcb app add dev $swp1 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7106 dcb app add dev $swp2 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7107}108 109switch_destroy()110{111 dcb app del dev $swp2 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7112 dcb app del dev $swp1 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7113 114 tc qdisc del dev $swp2 clsact115 tc qdisc del dev $swp1 clsact116 117 __simple_if_fini $swp2 192.0.2.17/28118 simple_if_fini $swp1 192.0.2.2/28119}120 121setup_prepare()122{123 h1=${NETIFS[p1]}124 swp1=${NETIFS[p2]}125 126 swp2=${NETIFS[p3]}127 h2=${NETIFS[p4]}128 129 vrf_prepare130 131 sysctl_set net.ipv4.ip_forward_update_priority 1132 h1_create133 h2_create134 switch_create135}136 137cleanup()138{139 pre_cleanup140 141 switch_destroy142 h2_destroy143 h1_destroy144 sysctl_restore net.ipv4.ip_forward_update_priority145 146 vrf_cleanup147}148 149ping_ipv4()150{151 ping_test $h1 192.0.2.18152}153 154dscp_ping_test()155{156 local vrf_name=$1; shift157 local sip=$1; shift158 local dip=$1; shift159 local prio=$1; shift160 local reprio=$1; shift161 local dev1=$1; shift162 local dev2=$1; shift163 local i164 165 local prio2=$($reprio $prio) # ICMP Request egress prio166 local prio3=$($reprio $prio2) # ICMP Response egress prio167 168 local dscp=$((prio << 2)) # ICMP Request ingress DSCP169 local dscp2=$((prio2 << 2)) # ICMP Request egress DSCP170 local dscp3=$((prio3 << 2)) # ICMP Response egress DSCP171 172 RET=0173 174 eval "local -A dev1_t0s=($(dscp_fetch_stats $dev1 0))"175 eval "local -A dev2_t0s=($(dscp_fetch_stats $dev2 0))"176 177 local ping_timeout=$((PING_TIMEOUT * 5))178 ip vrf exec $vrf_name \179 ${PING} -Q $dscp ${sip:+-I $sip} $dip \180 -c 10 -i 0.5 -w $ping_timeout &> /dev/null181 182 eval "local -A dev1_t1s=($(dscp_fetch_stats $dev1 0))"183 eval "local -A dev2_t1s=($(dscp_fetch_stats $dev2 0))"184 185 for i in {0..7}; do186 local dscpi=$((i << 2))187 local expect2=0188 local expect3=0189 190 if ((i == prio2)); then191 expect2=10192 fi193 if ((i == prio3)); then194 expect3=10195 fi196 197 local delta=$((dev2_t1s[$i] - dev2_t0s[$i]))198 ((expect2 == delta))199 check_err $? "DSCP $dscpi@$dev2: Expected to capture $expect2 packets, got $delta."200 201 delta=$((dev1_t1s[$i] - dev1_t0s[$i]))202 ((expect3 == delta))203 check_err $? "DSCP $dscpi@$dev1: Expected to capture $expect3 packets, got $delta."204 done205 206 log_test "DSCP rewrite: $dscp-(prio $prio2)-$dscp2-(prio $prio3)-$dscp3"207}208 209__test_update()210{211 local update=$1; shift212 local reprio=$1; shift213 local prio214 215 sysctl_restore net.ipv4.ip_forward_update_priority216 sysctl_set net.ipv4.ip_forward_update_priority $update217 218 for prio in {0..7}; do219 dscp_ping_test v$h1 192.0.2.1 192.0.2.18 $prio $reprio $h1 $h2220 done221}222 223test_update()224{225 echo "Test net.ipv4.ip_forward_update_priority=1"226 __test_update 1 reprioritize227}228 229test_no_update()230{231 echo "Test net.ipv4.ip_forward_update_priority=0"232 __test_update 0 echo233}234 235# Test that when DSCP is updated in pedit, the DSCP rewrite is turned off.236test_pedit_norewrite()237{238 echo "Test no DSCP rewrite after DSCP is updated by pedit"239 240 tc filter add dev $swp1 ingress handle 101 pref 1 prot ip flower \241 action pedit ex munge ip dsfield set $((3 << 2)) retain 0xfc \242 action skbedit priority 3243 244 __test_update 0 three245 246 tc filter del dev $swp1 ingress pref 1247}248 249# Test that when the last APP rule is removed, the prio->DSCP map is properly250# set to zeroes, and that the last APP rule does not stay active in the ASIC.251test_dscp_leftover()252{253 echo "Test that last removed DSCP rule is deconfigured correctly"254 255 dcb app del dev $swp2 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7256 257 __test_update 0 zero258 259 dcb app add dev $swp2 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7260}261 262trap cleanup EXIT263 264setup_prepare265setup_wait266 267tests_run268 269exit $EXIT_STATUS270