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1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# This test is for checking the psample module. It makes use of netdevsim
5# which periodically generates "sampled" packets.
6
7lib_dir=$(dirname $0)/../../../net/forwarding
8
9ALL_TESTS="
10 psample_enable_test
11 psample_group_num_test
12 psample_md_test
13"
14NETDEVSIM_PATH=/sys/bus/netdevsim/
15DEV_ADDR=1337
16DEV=netdevsim${DEV_ADDR}
17SYSFS_NET_DIR=/sys/bus/netdevsim/devices/$DEV/net/
18PSAMPLE_DIR=/sys/kernel/debug/netdevsim/$DEV/psample/
19CAPTURE_FILE=$(mktemp)
20NUM_NETIFS=0
21source $lib_dir/lib.sh
22
23DEVLINK_DEV=
24source $lib_dir/devlink_lib.sh
25DEVLINK_DEV=netdevsim/${DEV}
26
27# Available at https://github.com/Mellanox/libpsample
28require_command psample
29
30psample_capture()
31{
32 rm -f $CAPTURE_FILE
33
34 timeout 2 ip netns exec testns1 psample &> $CAPTURE_FILE
35}
36
37psample_enable_test()
38{
39 RET=0
40
41 echo 1 > $PSAMPLE_DIR/enable
42 check_err $? "Failed to enable sampling when should not"
43
44 echo 1 > $PSAMPLE_DIR/enable 2>/dev/null
45 check_fail $? "Sampling enablement succeeded when should fail"
46
47 psample_capture
48 if [ $(cat $CAPTURE_FILE | wc -l) -eq 0 ]; then
49 check_err 1 "Failed to capture sampled packets"
50 fi
51
52 echo 0 > $PSAMPLE_DIR/enable
53 check_err $? "Failed to disable sampling when should not"
54
55 echo 0 > $PSAMPLE_DIR/enable 2>/dev/null
56 check_fail $? "Sampling disablement succeeded when should fail"
57
58 psample_capture
59 if [ $(cat $CAPTURE_FILE | wc -l) -ne 0 ]; then
60 check_err 1 "Captured sampled packets when should not"
61 fi
62
63 log_test "psample enable / disable"
64}
65
66psample_group_num_test()
67{
68 RET=0
69
70 echo 1234 > $PSAMPLE_DIR/group_num
71 echo 1 > $PSAMPLE_DIR/enable
72
73 psample_capture
74 grep -q -e "group 1234" $CAPTURE_FILE
75 check_err $? "Sampled packets reported with wrong group number"
76
77 # New group number should only be used after disable / enable.
78 echo 4321 > $PSAMPLE_DIR/group_num
79
80 psample_capture
81 grep -q -e "group 4321" $CAPTURE_FILE
82 check_fail $? "Group number changed while sampling is active"
83
84 echo 0 > $PSAMPLE_DIR/enable && echo 1 > $PSAMPLE_DIR/enable
85
86 psample_capture
87 grep -q -e "group 4321" $CAPTURE_FILE
88 check_err $? "Group number did not change after restarting sampling"
89
90 log_test "psample group number"
91
92 echo 0 > $PSAMPLE_DIR/enable
93}
94
95psample_md_test()
96{
97 RET=0
98
99 echo 1 > $PSAMPLE_DIR/enable
100
101 echo 1234 > $PSAMPLE_DIR/in_ifindex
102 echo 4321 > $PSAMPLE_DIR/out_ifindex
103 psample_capture
104
105 grep -q -e "in-ifindex 1234" $CAPTURE_FILE
106 check_err $? "Sampled packets reported with wrong in-ifindex"
107
108 grep -q -e "out-ifindex 4321" $CAPTURE_FILE
109 check_err $? "Sampled packets reported with wrong out-ifindex"
110
111 echo 5 > $PSAMPLE_DIR/out_tc
112 psample_capture
113
114 grep -q -e "out-tc 5" $CAPTURE_FILE
115 check_err $? "Sampled packets reported with wrong out-tc"
116
117 echo $((2**16 - 1)) > $PSAMPLE_DIR/out_tc
118 psample_capture
119
120 grep -q -e "out-tc " $CAPTURE_FILE
121 check_fail $? "Sampled packets reported with out-tc when should not"
122
123 echo 1 > $PSAMPLE_DIR/out_tc
124 echo 10000 > $PSAMPLE_DIR/out_tc_occ_max
125 psample_capture
126
127 grep -q -e "out-tc-occ " $CAPTURE_FILE
128 check_err $? "Sampled packets not reported with out-tc-occ when should"
129
130 echo 0 > $PSAMPLE_DIR/out_tc_occ_max
131 psample_capture
132
133 grep -q -e "out-tc-occ " $CAPTURE_FILE
134 check_fail $? "Sampled packets reported with out-tc-occ when should not"
135
136 echo 10000 > $PSAMPLE_DIR/latency_max
137 psample_capture
138
139 grep -q -e "latency " $CAPTURE_FILE
140 check_err $? "Sampled packets not reported with latency when should"
141
142 echo 0 > $PSAMPLE_DIR/latency_max
143 psample_capture
144
145 grep -q -e "latency " $CAPTURE_FILE
146 check_fail $? "Sampled packets reported with latency when should not"
147
148 log_test "psample metadata"
149
150 echo 0 > $PSAMPLE_DIR/enable
151}
152
153setup_prepare()
154{
155 modprobe netdevsim &> /dev/null
156
157 echo "$DEV_ADDR 1" > ${NETDEVSIM_PATH}/new_device
158 while [ ! -d $SYSFS_NET_DIR ] ; do :; done
159
160 set -e
161
162 ip netns add testns1
163 devlink dev reload $DEVLINK_DEV netns testns1
164
165 set +e
166}
167
168cleanup()
169{
170 pre_cleanup
171 rm -f $CAPTURE_FILE
172 ip netns del testns1
173 echo "$DEV_ADDR" > ${NETDEVSIM_PATH}/del_device
174 modprobe -r netdevsim &> /dev/null
175}
176
177trap cleanup EXIT
178
179setup_prepare
180
181tests_run
182
183exit $EXIT_STATUS