linux-kernel - Re: [PATCH net 2/2] selftests: mptcp: explicitly trigger the listener diag code-path

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Date: Wed, 21 Feb 2024 16:19:19 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: Matthieu Baerts <matttbe@...nel.org>, Mat Martineau
 <martineau@...nel.org>,  Geliang Tang <geliang@...nel.org>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,  Jakub
 Kicinski <kuba@...nel.org>, Shuah Khan <shuah@...nel.org>,
 mptcp@...ts.linux.dev,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 2/2] selftests: mptcp: explicitly trigger the
 listener diag code-path

On Wed, 2024-02-21 at 12:46 +0100, Paolo Abeni wrote:
> The mptcp diag interface already experienced a few locking bugs
> that lockdep and appropriate coverage have detected in advance.
> 
> Let's add a test-case triggering the relevant code path, to prevent
> similar issues in the future.
> 
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
>  tools/testing/selftests/net/mptcp/diag.sh | 30 +++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/tools/testing/selftests/net/mptcp/diag.sh b/tools/testing/selftests/net/mptcp/diag.sh
> index 60a7009ce1b5..3ab584b38566 100755
> --- a/tools/testing/selftests/net/mptcp/diag.sh
> +++ b/tools/testing/selftests/net/mptcp/diag.sh
> @@ -81,6 +81,21 @@ chk_msk_nr()
>  	__chk_msk_nr "grep -c token:" "$@"
>  }
>  
> +chk_listener_nr()
> +{
> +	local expected=$1
> +	local msg="$2"
> +
> +	if [ $expected -gt 0 ] && \
> +	   ! mptcp_lib_kallsyms_has "mptcp_diag_dump_listeners"; then
> +		printf "%-50s%s\n" "$msg - mptcp" "[ skip ]"
> +		mptcp_lib_result_skip "many listener sockets"

I was too hasty and this is too fragile/requires debug. A v2 with
something more reliable is needed. Given this is not going to land into
this week PR, we will probably send it with a burst with other fixes.

Thanks,

Paolo