net/netdevsim/psample.sh

0001 #!/bin/bash
0002 # SPDX-License-Identifier: GPL-2.0
0003 #
0004 # This test is for checking the psample module. It makes use of netdevsim
0005 # which periodically generates "sampled" packets.
0006
0007 lib_dir=$(dirname $0)/../../../net/forwarding
0008
0009 ALL_TESTS="
0010         psample_enable_test
0011         psample_group_num_test
0012         psample_md_test
0013 "
0014 NETDEVSIM_PATH=/sys/bus/netdevsim/
0015 DEV_ADDR=1337
0016 DEV=netdevsim${DEV_ADDR}
0017 SYSFS_NET_DIR=/sys/bus/netdevsim/devices/$DEV/net/
0018 PSAMPLE_DIR=/sys/kernel/debug/netdevsim/$DEV/psample/
0019 CAPTURE_FILE=$(mktemp)
0020 NUM_NETIFS=0
0021 source $lib_dir/lib.sh
0022
0023 DEVLINK_DEV=
0024 source $lib_dir/devlink_lib.sh
0025 DEVLINK_DEV=netdevsim/${DEV}
0026
0027 # Available at https://github.com/Mellanox/libpsample
0028 require_command psample
0029
0030 psample_capture()
0031 {
0032         rm -f $CAPTURE_FILE
0033
0034         timeout 2 ip netns exec testns1 psample &> $CAPTURE_FILE
0035 }
0036
0037 psample_enable_test()
0038 {
0039         RET=0
0040
0041         echo 1 > $PSAMPLE_DIR/enable
0042         check_err $? "Failed to enable sampling when should not"
0043
0044         echo 1 > $PSAMPLE_DIR/enable 2>/dev/null
0045         check_fail $? "Sampling enablement succeeded when should fail"
0046
0047         psample_capture
0048         if [ $(cat $CAPTURE_FILE | wc -l) -eq 0 ]; then
0049                 check_err 1 "Failed to capture sampled packets"
0050         fi
0051
0052         echo 0 > $PSAMPLE_DIR/enable
0053         check_err $? "Failed to disable sampling when should not"
0054
0055         echo 0 > $PSAMPLE_DIR/enable 2>/dev/null
0056         check_fail $? "Sampling disablement succeeded when should fail"
0057
0058         psample_capture
0059         if [ $(cat $CAPTURE_FILE | wc -l) -ne 0 ]; then
0060                 check_err 1 "Captured sampled packets when should not"
0061         fi
0062
0063         log_test "psample enable / disable"
0064 }
0065
0066 psample_group_num_test()
0067 {
0068         RET=0
0069
0070         echo 1234 > $PSAMPLE_DIR/group_num
0071         echo 1 > $PSAMPLE_DIR/enable
0072
0073         psample_capture
0074         grep -q -e "group 1234" $CAPTURE_FILE
0075         check_err $? "Sampled packets reported with wrong group number"
0076
0077         # New group number should only be used after disable / enable.
0078         echo 4321 > $PSAMPLE_DIR/group_num
0079
0080         psample_capture
0081         grep -q -e "group 4321" $CAPTURE_FILE
0082         check_fail $? "Group number changed while sampling is active"
0083
0084         echo 0 > $PSAMPLE_DIR/enable && echo 1 > $PSAMPLE_DIR/enable
0085
0086         psample_capture
0087         grep -q -e "group 4321" $CAPTURE_FILE
0088         check_err $? "Group number did not change after restarting sampling"
0089
0090         log_test "psample group number"
0091
0092         echo 0 > $PSAMPLE_DIR/enable
0093 }
0094
0095 psample_md_test()
0096 {
0097         RET=0
0098
0099         echo 1 > $PSAMPLE_DIR/enable
0100
0101         echo 1234 > $PSAMPLE_DIR/in_ifindex
0102         echo 4321 > $PSAMPLE_DIR/out_ifindex
0103         psample_capture
0104
0105         grep -q -e "in-ifindex 1234" $CAPTURE_FILE
0106         check_err $? "Sampled packets reported with wrong in-ifindex"
0107
0108         grep -q -e "out-ifindex 4321" $CAPTURE_FILE
0109         check_err $? "Sampled packets reported with wrong out-ifindex"
0110
0111         echo 5 > $PSAMPLE_DIR/out_tc
0112         psample_capture
0113
0114         grep -q -e "out-tc 5" $CAPTURE_FILE
0115         check_err $? "Sampled packets reported with wrong out-tc"
0116
0117         echo $((2**16 - 1)) > $PSAMPLE_DIR/out_tc
0118         psample_capture
0119
0120         grep -q -e "out-tc " $CAPTURE_FILE
0121         check_fail $? "Sampled packets reported with out-tc when should not"
0122
0123         echo 1 > $PSAMPLE_DIR/out_tc
0124         echo 10000 > $PSAMPLE_DIR/out_tc_occ_max
0125         psample_capture
0126
0127         grep -q -e "out-tc-occ " $CAPTURE_FILE
0128         check_err $? "Sampled packets not reported with out-tc-occ when should"
0129
0130         echo 0 > $PSAMPLE_DIR/out_tc_occ_max
0131         psample_capture
0132
0133         grep -q -e "out-tc-occ " $CAPTURE_FILE
0134         check_fail $? "Sampled packets reported with out-tc-occ when should not"
0135
0136         echo 10000 > $PSAMPLE_DIR/latency_max
0137         psample_capture
0138
0139         grep -q -e "latency " $CAPTURE_FILE
0140         check_err $? "Sampled packets not reported with latency when should"
0141
0142         echo 0 > $PSAMPLE_DIR/latency_max
0143         psample_capture
0144
0145         grep -q -e "latency " $CAPTURE_FILE
0146         check_fail $? "Sampled packets reported with latency when should not"
0147
0148         log_test "psample metadata"
0149
0150         echo 0 > $PSAMPLE_DIR/enable
0151 }
0152
0153 setup_prepare()
0154 {
0155         modprobe netdevsim &> /dev/null
0156
0157         echo "$DEV_ADDR 1" > ${NETDEVSIM_PATH}/new_device
0158         while [ ! -d $SYSFS_NET_DIR ] ; do :; done
0159
0160         set -e
0161
0162         ip netns add testns1
0163         devlink dev reload $DEVLINK_DEV netns testns1
0164
0165         set +e
0166 }
0167
0168 cleanup()
0169 {
0170         pre_cleanup
0171         rm -f $CAPTURE_FILE
0172         ip netns del testns1
0173         echo "$DEV_ADDR" > ${NETDEVSIM_PATH}/del_device
0174         modprobe -r netdevsim &> /dev/null
0175 }
0176
0177 trap cleanup EXIT
0178
0179 setup_prepare
0180
0181 tests_run
0182
0183 exit $EXIT_STATUS