1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0
3
4 # Test for DSCP prioritization in the router.
5 #
6 # With ip_forward_update_priority disabled, the packets are expected to keep
7 # their DSCP (which in this test uses only values 0..7) intact as they are
8 # forwarded by the switch. That is verified at $h2. ICMP responses are formed
9 # with the same DSCP as the requests, and likewise pass through the switch
10 # intact, which is verified at $h1.
11 #
12 # With ip_forward_update_priority enabled, router reprioritizes the packets
13 # according to the table in reprioritize(). Thus, say, DSCP 7 maps to priority
14 # 4, which on egress maps back to DSCP 4. The response packet then gets
15 # 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 $swp2 + |
26 # | 192.0.2.2/28 192.0.2.17/28 |
27 # | APP=0,5,0 .. 7,5,7 APP=0,5,0 .. 7,5,7 |
28 # +---------------------------------------------------------------------------+
29
30 ALL_TESTS="
31 ping_ipv4
32 test_update
33 test_no_update
34 test_pedit_norewrite
35 test_dscp_leftover
36 "
37
38 lib_dir=$(dirname $0)/../../../net/forwarding
39
40 NUM_NETIFS=4
41 source $lib_dir/lib.sh
42
43 reprioritize()
44 {
45 local in=$1; shift
46
47 # This is based on rt_tos2priority in include/net/route.h. Assuming 1:1
48 # mapping between priorities and TOS, it yields a new priority for a
49 # 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
55 zero()
56 {
57 echo 0
58 }
59
60 three()
61 {
62 echo 3
63 }
64
65 h1_create()
66 {
67 simple_if_init $h1 192.0.2.1/28
68 tc qdisc add dev $h1 clsact
69 dscp_capture_install $h1 0
70 ip route add vrf v$h1 192.0.2.16/28 via 192.0.2.2
71 }
72
73 h1_destroy()
74 {
75 ip route del vrf v$h1 192.0.2.16/28 via 192.0.2.2
76 dscp_capture_uninstall $h1 0
77 tc qdisc del dev $h1 clsact
78 simple_if_fini $h1 192.0.2.1/28
79 }
80
81 h2_create()
82 {
83 simple_if_init $h2 192.0.2.18/28
84 tc qdisc add dev $h2 clsact
85 dscp_capture_install $h2 0
86 ip route add vrf v$h2 192.0.2.0/28 via 192.0.2.17
87 }
88
89 h2_destroy()
90 {
91 ip route del vrf v$h2 192.0.2.0/28 via 192.0.2.17
92 dscp_capture_uninstall $h2 0
93 tc qdisc del dev $h2 clsact
94 simple_if_fini $h2 192.0.2.18/28
95 }
96
97 switch_create()
98 {
99 simple_if_init $swp1 192.0.2.2/28
100 __simple_if_init $swp2 v$swp1 192.0.2.17/28
101
102 tc qdisc add dev $swp1 clsact
103 tc qdisc add dev $swp2 clsact
104
105 dcb app add dev $swp1 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
106 dcb app add dev $swp2 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
107 }
108
109 switch_destroy()
110 {
111 dcb app del dev $swp2 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
112 dcb app del dev $swp1 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
113
114 tc qdisc del dev $swp2 clsact
115 tc qdisc del dev $swp1 clsact
116
117 __simple_if_fini $swp2 192.0.2.17/28
118 simple_if_fini $swp1 192.0.2.2/28
119 }
120
121 setup_prepare()
122 {
123 h1=${NETIFS[p1]}
124 swp1=${NETIFS[p2]}
125
126 swp2=${NETIFS[p3]}
127 h2=${NETIFS[p4]}
128
129 vrf_prepare
130
131 sysctl_set net.ipv4.ip_forward_update_priority 1
132 h1_create
133 h2_create
134 switch_create
135 }
136
137 cleanup()
138 {
139 pre_cleanup
140
141 switch_destroy
142 h2_destroy
143 h1_destroy
144 sysctl_restore net.ipv4.ip_forward_update_priority
145
146 vrf_cleanup
147 }
148
149 ping_ipv4()
150 {
151 ping_test $h1 192.0.2.18
152 }
153
154 dscp_ping_test()
155 {
156 local vrf_name=$1; shift
157 local sip=$1; shift
158 local dip=$1; shift
159 local prio=$1; shift
160 local reprio=$1; shift
161 local dev1=$1; shift
162 local dev2=$1; shift
163 local i
164
165 local prio2=$($reprio $prio) # ICMP Request egress prio
166 local prio3=$($reprio $prio2) # ICMP Response egress prio
167
168 local dscp=$((prio << 2)) # ICMP Request ingress DSCP
169 local dscp2=$((prio2 << 2)) # ICMP Request egress DSCP
170 local dscp3=$((prio3 << 2)) # ICMP Response egress DSCP
171
172 RET=0
173
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 $ping_timeout &> /dev/null
181
182 eval "local -A dev1_t1s=($(dscp_fetch_stats $dev1 0))"
183 eval "local -A dev2_t1s=($(dscp_fetch_stats $dev2 0))"
184
185 for i in {0..7}; do
186 local dscpi=$((i << 2))
187 local expect2=0
188 local expect3=0
189
190 if ((i == prio2)); then
191 expect2=10
192 fi
193 if ((i == prio3)); then
194 expect3=10
195 fi
196
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 done
205
206 log_test "DSCP rewrite: $dscp-(prio $prio2)-$dscp2-(prio $prio3)-$dscp3"
207 }
208
209 __test_update()
210 {
211 local update=$1; shift
212 local reprio=$1; shift
213 local prio
214
215 sysctl_restore net.ipv4.ip_forward_update_priority
216 sysctl_set net.ipv4.ip_forward_update_priority $update
217
218 for prio in {0..7}; do
219 dscp_ping_test v$h1 192.0.2.1 192.0.2.18 $prio $reprio $h1 $h2
220 done
221 }
222
223 test_update()
224 {
225 echo "Test net.ipv4.ip_forward_update_priority=1"
226 __test_update 1 reprioritize
227 }
228
229 test_no_update()
230 {
231 echo "Test net.ipv4.ip_forward_update_priority=0"
232 __test_update 0 echo
233 }
234
235 # Test that when DSCP is updated in pedit, the DSCP rewrite is turned off.
236 test_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 3
243
244 __test_update 0 three
245
246 tc filter del dev $swp1 ingress pref 1
247 }
248
249 # Test that when the last APP rule is removed, the prio->DSCP map is properly
250 # set to zeroes, and that the last APP rule does not stay active in the ASIC.
251 test_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 7:7
256
257 __test_update 0 zero
258
259 dcb app add dev $swp2 dscp-prio 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
260 }
261
262 trap cleanup EXIT
263
264 setup_prepare
265 setup_wait
266
267 tests_run
268
269 exit $EXIT_STATUS
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