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linux/tools/testing/selftests/kmod/kmod.sh
Shuah Khan (Samsung OSG) 82337406d1 selftests: kmod: return Kselftest Skip code for skipped tests 
When kmod test is skipped because of unmet dependencies and/or unsupported
configuration, it returns 0 which is treated as a pass by the Kselftest
framework. This leads to false positive result even when the test could
not be run. It returns fail in some cases when test is skipped. Either way,
it is incorrect and incosnistent reporting.

Change it to return kselftest skip code when a test gets skipped to
clearly report that the test could not be run.

Kselftest framework SKIP code is 4 and the framework prints appropriate
messages to indicate that the test is skipped.

Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
Reviewed-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
2018-05-30 15:21:53 -06:00

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#!/bin/bash
#
# Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or at your option any
# later version; or, when distributed separately from the Linux kernel or
# when incorporated into other software packages, subject to the following
# license:
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of copyleft-next (version 0.3.1 or later) as published
# at http://copyleft-next.org/.
# This is a stress test script for kmod, the kernel module loader. It uses
# test_kmod which exposes a series of knobs for the API for us so we can
# tweak each test in userspace rather than in kernelspace.
#
# The way kmod works is it uses the kernel's usermode helper API to eventually
# call /sbin/modprobe. It has a limit of the number of concurrent calls
# possible. The kernel interface to load modules is request_module(), however
# mount uses get_fs_type(). Both behave slightly differently, but the
# differences are important enough to test each call separately. For this
# reason test_kmod starts by providing tests for both calls.
#
# The test driver test_kmod assumes a series of defaults which you can
# override by exporting to your environment prior running this script.
# For instance this script assumes you do not have xfs loaded upon boot.
# If this is false, export DEFAULT_KMOD_FS="ext4" prior to running this
# script if the filesyste module you don't have loaded upon bootup
# is ext4 instead. Refer to allow_user_defaults() for a list of user
# override variables possible.
#
# You'll want at least 4 GiB of RAM to expect to run these tests
# without running out of memory on them. For other requirements refer
# to test_reqs()
set -e
TEST_NAME="kmod"
TEST_DRIVER="test_${TEST_NAME}"
TEST_DIR=$(dirname $0)
# This represents
#
# TEST_ID:TEST_COUNT:ENABLED
#
# TEST_ID: is the test id number
# TEST_COUNT: number of times we should run the test
# ENABLED: 1 if enabled, 0 otherwise
#
# Once these are enabled please leave them as-is. Write your own test,
# we have tons of space.
ALL_TESTS="0001:3:1"
ALL_TESTS="$ALL_TESTS 0002:3:1"
ALL_TESTS="$ALL_TESTS 0003:1:1"
ALL_TESTS="$ALL_TESTS 0004:1:1"
ALL_TESTS="$ALL_TESTS 0005:10:1"
ALL_TESTS="$ALL_TESTS 0006:10:1"
ALL_TESTS="$ALL_TESTS 0007:5:1"
ALL_TESTS="$ALL_TESTS 0008:150:1"
ALL_TESTS="$ALL_TESTS 0009:150:1"
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
test_modprobe()
{
if [ ! -d $DIR ]; then
echo "$0: $DIR not present" >&2
echo "You must have the following enabled in your kernel:" >&2
cat $TEST_DIR/config >&2
exit $ksft_skip
fi
}
function allow_user_defaults()
{
if [ -z $DEFAULT_KMOD_DRIVER ]; then
DEFAULT_KMOD_DRIVER="test_module"
fi
if [ -z $DEFAULT_KMOD_FS ]; then
DEFAULT_KMOD_FS="xfs"
fi
if [ -z $PROC_DIR ]; then
PROC_DIR="/proc/sys/kernel/"
fi
if [ -z $MODPROBE_LIMIT ]; then
MODPROBE_LIMIT=50
fi
if [ -z $DIR ]; then
DIR="/sys/devices/virtual/misc/${TEST_DRIVER}0/"
fi
if [ -z $DEFAULT_NUM_TESTS ]; then
DEFAULT_NUM_TESTS=150
fi
MODPROBE_LIMIT_FILE="${PROC_DIR}/kmod-limit"
}
test_reqs()
{
if ! which modprobe 2> /dev/null > /dev/null; then
echo "$0: You need modprobe installed" >&2
exit $ksft_skip
fi
if ! which kmod 2> /dev/null > /dev/null; then
echo "$0: You need kmod installed" >&2
exit $ksft_skip
fi
# kmod 19 has a bad bug where it returns 0 when modprobe
# gets called *even* if the module was not loaded due to
# some bad heuristics. For details see:
#
# A work around is possible in-kernel but its rather
# complex.
KMOD_VERSION=$(kmod --version | awk '{print $3}')
if [[ $KMOD_VERSION -le 19 ]]; then
echo "$0: You need at least kmod 20" >&2
echo "kmod <= 19 is buggy, for details see:" >&2
echo "http://git.kernel.org/cgit/utils/kernel/kmod/kmod.git/commit/libkmod/libkmod-module.c?id=fd44a98ae2eb5eb32161088954ab21e58e19dfc4" >&2
exit $ksft_skip
fi
uid=$(id -u)
if [ $uid -ne 0 ]; then
echo $msg must be run as root >&2
exit $ksft_skip
fi
}
function load_req_mod()
{
trap "test_modprobe" EXIT
if [ ! -d $DIR ]; then
# Alanis: "Oh isn't it ironic?"
modprobe $TEST_DRIVER
fi
}
test_finish()
{
echo "Test completed"
}
errno_name_to_val()
{
case "$1" in
# kmod calls modprobe and upon of a module not found
# modprobe returns just 1... However in the kernel we
# *sometimes* see 256...
MODULE_NOT_FOUND)
echo 256;;
SUCCESS)
echo 0;;
-EPERM)
echo -1;;
-ENOENT)
echo -2;;
-EINVAL)
echo -22;;
-ERR_ANY)
echo -123456;;
*)
echo invalid;;
esac
}
errno_val_to_name()
case "$1" in
256)
echo MODULE_NOT_FOUND;;
0)
echo SUCCESS;;
-1)
echo -EPERM;;
-2)
echo -ENOENT;;
-22)
echo -EINVAL;;
-123456)
echo -ERR_ANY;;
*)
echo invalid;;
esac
config_set_test_case_driver()
{
if ! echo -n 1 >$DIR/config_test_case; then
echo "$0: Unable to set to test case to driver" >&2
exit 1
fi
}
config_set_test_case_fs()
{
if ! echo -n 2 >$DIR/config_test_case; then
echo "$0: Unable to set to test case to fs" >&2
exit 1
fi
}
config_num_threads()
{
if ! echo -n $1 >$DIR/config_num_threads; then
echo "$0: Unable to set to number of threads" >&2
exit 1
fi
}
config_get_modprobe_limit()
{
if [[ -f ${MODPROBE_LIMIT_FILE} ]] ; then
MODPROBE_LIMIT=$(cat $MODPROBE_LIMIT_FILE)
fi
echo $MODPROBE_LIMIT
}
config_num_thread_limit_extra()
{
MODPROBE_LIMIT=$(config_get_modprobe_limit)
let EXTRA_LIMIT=$MODPROBE_LIMIT+$1
config_num_threads $EXTRA_LIMIT
}
# For special characters use printf directly,
# refer to kmod_test_0001
config_set_driver()
{
if ! echo -n $1 >$DIR/config_test_driver; then
echo "$0: Unable to set driver" >&2
exit 1
fi
}
config_set_fs()
{
if ! echo -n $1 >$DIR/config_test_fs; then
echo "$0: Unable to set driver" >&2
exit 1
fi
}
config_get_driver()
{
cat $DIR/config_test_driver
}
config_get_test_result()
{
cat $DIR/test_result
}
config_reset()
{
if ! echo -n "1" >"$DIR"/reset; then
echo "$0: reset shuld have worked" >&2
exit 1
fi
}
config_show_config()
{
echo "----------------------------------------------------"
cat "$DIR"/config
echo "----------------------------------------------------"
}
config_trigger()
{
if ! echo -n "1" >"$DIR"/trigger_config 2>/dev/null; then
echo "$1: FAIL - loading should have worked"
config_show_config
exit 1
fi
echo "$1: OK! - loading kmod test"
}
config_trigger_want_fail()
{
if echo "1" > $DIR/trigger_config 2>/dev/null; then
echo "$1: FAIL - test case was expected to fail"
config_show_config
exit 1
fi
echo "$1: OK! - kmod test case failed as expected"
}
config_expect_result()
{
RC=$(config_get_test_result)
RC_NAME=$(errno_val_to_name $RC)
ERRNO_NAME=$2
ERRNO=$(errno_name_to_val $ERRNO_NAME)
if [[ $ERRNO_NAME = "-ERR_ANY" ]]; then
if [[ $RC -ge 0 ]]; then
echo "$1: FAIL, test expects $ERRNO_NAME - got $RC_NAME ($RC)" >&2
config_show_config
exit 1
fi
elif [[ $RC != $ERRNO ]]; then
echo "$1: FAIL, test expects $ERRNO_NAME ($ERRNO) - got $RC_NAME ($RC)" >&2
config_show_config
exit 1
fi
echo "$1: OK! - Return value: $RC ($RC_NAME), expected $ERRNO_NAME"
}
kmod_defaults_driver()
{
config_reset
modprobe -r $DEFAULT_KMOD_DRIVER
config_set_driver $DEFAULT_KMOD_DRIVER
}
kmod_defaults_fs()
{
config_reset
modprobe -r $DEFAULT_KMOD_FS
config_set_fs $DEFAULT_KMOD_FS
config_set_test_case_fs
}
kmod_test_0001_driver()
{
NAME='\000'
kmod_defaults_driver
config_num_threads 1
printf '\000' >"$DIR"/config_test_driver
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND
}
kmod_test_0001_fs()
{
NAME='\000'
kmod_defaults_fs
config_num_threads 1
printf '\000' >"$DIR"/config_test_fs
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} -EINVAL
}
kmod_test_0001()
{
kmod_test_0001_driver
kmod_test_0001_fs
}
kmod_test_0002_driver()
{
NAME="nope-$DEFAULT_KMOD_DRIVER"
kmod_defaults_driver
config_set_driver $NAME
config_num_threads 1
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND
}
kmod_test_0002_fs()
{
NAME="nope-$DEFAULT_KMOD_FS"
kmod_defaults_fs
config_set_fs $NAME
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} -EINVAL
}
kmod_test_0002()
{
kmod_test_0002_driver
kmod_test_0002_fs
}
kmod_test_0003()
{
kmod_defaults_fs
config_num_threads 1
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0004()
{
kmod_defaults_fs
config_num_threads 2
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0005()
{
kmod_defaults_driver
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0006()
{
kmod_defaults_fs
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0007()
{
kmod_test_0005
kmod_test_0006
}
kmod_test_0008()
{
kmod_defaults_driver
MODPROBE_LIMIT=$(config_get_modprobe_limit)
let EXTRA=$MODPROBE_LIMIT/6
config_num_thread_limit_extra $EXTRA
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
kmod_test_0009()
{
kmod_defaults_fs
MODPROBE_LIMIT=$(config_get_modprobe_limit)
let EXTRA=$MODPROBE_LIMIT/4
config_num_thread_limit_extra $EXTRA
config_trigger ${FUNCNAME[0]}
config_expect_result ${FUNCNAME[0]} SUCCESS
}
list_tests()
{
echo "Test ID list:"
echo
echo "TEST_ID x NUM_TEST"
echo "TEST_ID: Test ID"
echo "NUM_TESTS: Number of recommended times to run the test"
echo
echo "0001 x $(get_test_count 0001) - Simple test - 1 thread for empty string"
echo "0002 x $(get_test_count 0002) - Simple test - 1 thread for modules/filesystems that do not exist"
echo "0003 x $(get_test_count 0003) - Simple test - 1 thread for get_fs_type() only"
echo "0004 x $(get_test_count 0004) - Simple test - 2 threads for get_fs_type() only"
echo "0005 x $(get_test_count 0005) - multithreaded tests with default setup - request_module() only"
echo "0006 x $(get_test_count 0006) - multithreaded tests with default setup - get_fs_type() only"
echo "0007 x $(get_test_count 0007) - multithreaded tests with default setup test request_module() and get_fs_type()"
echo "0008 x $(get_test_count 0008) - multithreaded - push kmod_concurrent over max_modprobes for request_module()"
echo "0009 x $(get_test_count 0009) - multithreaded - push kmod_concurrent over max_modprobes for get_fs_type()"
}
usage()
{
NUM_TESTS=$(grep -o ' ' <<<"$ALL_TESTS" | grep -c .)
let NUM_TESTS=$NUM_TESTS+1
MAX_TEST=$(printf "%04d\n" $NUM_TESTS)
echo "Usage: $0 [ -t <4-number-digit> ] | [ -w <4-number-digit> ] |"
echo " [ -s <4-number-digit> ] | [ -c <4-number-digit> <test- count>"
echo " [ all ] [ -h | --help ] [ -l ]"
echo ""
echo "Valid tests: 0001-$MAX_TEST"
echo ""
echo " all Runs all tests (default)"
echo " -t Run test ID the number amount of times is recommended"
echo " -w Watch test ID run until it runs into an error"
echo " -s Run test ID once"
echo " -c Run test ID x test-count number of times"
echo " -l List all test ID list"
echo " -h|--help Help"
echo
echo "If an error every occurs execution will immediately terminate."
echo "If you are adding a new test try using -w <test-ID> first to"
echo "make sure the test passes a series of tests."
echo
echo Example uses:
echo
echo "${TEST_NAME}.sh -- executes all tests"
echo "${TEST_NAME}.sh -t 0008 -- Executes test ID 0008 number of times is recomended"
echo "${TEST_NAME}.sh -w 0008 -- Watch test ID 0008 run until an error occurs"
echo "${TEST_NAME}.sh -s 0008 -- Run test ID 0008 once"
echo "${TEST_NAME}.sh -c 0008 3 -- Run test ID 0008 three times"
echo
list_tests
exit 1
}
function test_num()
{
re='^[0-9]+$'
if ! [[ $1 =~ $re ]]; then
usage
fi
}
function get_test_count()
{
test_num $1
TEST_DATA=$(echo $ALL_TESTS | awk '{print $'$1'}')
LAST_TWO=${TEST_DATA#*:*}
echo ${LAST_TWO%:*}
}
function get_test_enabled()
{
test_num $1
TEST_DATA=$(echo $ALL_TESTS | awk '{print $'$1'}')
echo ${TEST_DATA#*:*:}
}
function run_all_tests()
{
for i in $ALL_TESTS ; do
TEST_ID=${i%:*:*}
ENABLED=$(get_test_enabled $TEST_ID)
TEST_COUNT=$(get_test_count $TEST_ID)
if [[ $ENABLED -eq "1" ]]; then
test_case $TEST_ID $TEST_COUNT
fi
done
}
function watch_log()
{
if [ $# -ne 3 ]; then
clear
fi
date
echo "Running test: $2 - run #$1"
}
function watch_case()
{
i=0
while [ 1 ]; do
if [ $# -eq 1 ]; then
test_num $1
watch_log $i ${TEST_NAME}_test_$1
${TEST_NAME}_test_$1
else
watch_log $i all
run_all_tests
fi
let i=$i+1
done
}
function test_case()
{
NUM_TESTS=$DEFAULT_NUM_TESTS
if [ $# -eq 2 ]; then
NUM_TESTS=$2
fi
i=0
while [ $i -lt $NUM_TESTS ]; do
test_num $1
watch_log $i ${TEST_NAME}_test_$1 noclear
RUN_TEST=${TEST_NAME}_test_$1
$RUN_TEST
let i=$i+1
done
}
function parse_args()
{
if [ $# -eq 0 ]; then
run_all_tests
else
if [[ "$1" = "all" ]]; then
run_all_tests
elif [[ "$1" = "-w" ]]; then
shift
watch_case $@
elif [[ "$1" = "-t" ]]; then
shift
test_num $1
test_case $1 $(get_test_count $1)
elif [[ "$1" = "-c" ]]; then
shift
test_num $1
test_num $2
test_case $1 $2
elif [[ "$1" = "-s" ]]; then
shift
test_case $1 1
elif [[ "$1" = "-l" ]]; then
list_tests
elif [[ "$1" = "-h" || "$1" = "--help" ]]; then
usage
else
usage
fi
fi
}
test_reqs
allow_user_defaults
load_req_mod
trap "test_finish" EXIT
parse_args $@
exit 0
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