netdev - Re: [PATCH] selftests: bpf: test_kmod.sh: check the module path before insmod

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Date:   Wed, 7 Feb 2018 23:47:16 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Shuah Khan <shuahkh@....samsung.com>,
        linux-kselftest@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        netdev@...r.kernel.org, alexei.starovoitov@...il.com,
        ast@...nel.org
Subject: Re: [PATCH] selftests: bpf: test_kmod.sh: check the module path
 before insmod

Hi Daniel,

On 7 February 2018 at 19:02, Daniel Borkmann <daniel@...earbox.net> wrote:
> Hi Naresh,
>
> On 02/06/2018 10:07 PM, Naresh Kamboju wrote:
>> test_kmod.sh reported false failure when module not present.
>> Check test_bpf.ko is present in the path before loading it.
>>
>> Stop using "insmod $SRC_TREE/lib/test_bpf.ko" instead use
>> "modprobe test_bpf"
>>
>> Signed-off-by: Naresh Kamboju <naresh.kamboju@...aro.org>
>
> Thanks for looking into this! Could we have a way to be able to
> support both? Say, when test_bpf.ko from SRC_TREE is not present,
> we try with modprobe -q fallback? I would still like to support
> the case where you can make local changes and add new tests to
> test_bpf.c, recompile and then just rerun the test_kmod.sh w/o
> having to install it first.

Thanks for the review comments.
I have sent patch v2 with your comments addressed.

- Naresh

>
> Thanks,
> Daniel
>
>>  tools/testing/selftests/bpf/test_kmod.sh | 11 +++++++----
>>  1 file changed, 7 insertions(+), 4 deletions(-)
>>
>> diff --git a/tools/testing/selftests/bpf/test_kmod.sh b/tools/testing/selftests/bpf/test_kmod.sh
>> index ed4774d..54177b1 100755
>> --- a/tools/testing/selftests/bpf/test_kmod.sh
>> +++ b/tools/testing/selftests/bpf/test_kmod.sh
>> @@ -1,8 +1,6 @@
>>  #!/bin/sh
>>  # SPDX-License-Identifier: GPL-2.0
>>
>> -SRC_TREE=../../../../
>> -
>>  test_run()
>>  {
>>       sysctl -w net.core.bpf_jit_enable=$1 2>&1 > /dev/null
>> @@ -10,8 +8,13 @@ test_run()
>>
>>       echo "[ JIT enabled:$1 hardened:$2 ]"
>>       dmesg -C
>> -     insmod $SRC_TREE/lib/test_bpf.ko 2> /dev/null
>> -     if [ $? -ne 0 ]; then
>> +     # Use modprobe dry run to check for missing test_bpf module
>> +     if ! /sbin/modprobe -q -n test_bpf; then
>> +             echo "test_bpf: [SKIP]"
>> +     elif /sbin/modprobe -q test_bpf; then
>> +             echo "test_bpf: ok"
>> +     else
>> +             echo "test_bpf: [FAIL]"
>>               rc=1
>>       fi
>>       rmmod  test_bpf 2> /dev/null
>>
>