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

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Date:   Wed, 7 Feb 2018 14:32:44 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        shuahkh@....samsung.com, linux-kselftest@...r.kernel.org
Cc:     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 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,
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
>