linux-kernel - Re: [PATCH blktests v2 2/2] nvme-rc: Cleanup fc resource before module unloading

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Date:   Wed, 19 Apr 2023 12:44:42 +0300
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Daniel Wagner <dwagner@...e.de>, linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Chaitanya Kulkarni <kch@...dia.com>,
        Shin'ichiro Kawasaki <shinichiro@...tmail.com>
Subject: Re: [PATCH blktests v2 2/2] nvme-rc: Cleanup fc resource before
 module unloading


> Before we unload the module we should cleanup the fc resources first,
> basically reorder the shutdown sequence to be in reverse order of the
> setup path.

If this triggers a bug, then I think it is a good idea to have a
dedicated test that reproduces it if we are changing the default
behavior.

> 
> Also unload the nvme-fcloop after usage.
> 
> While at it also update the rdma stop_soft_rdma before the module
> unloading for the same reasoning.

Why? it creates the wrong reverse ordering.

1. setup soft-rdma
2. setup nvme-rdma

2. teardown nvme-rdma
1. teardown soft-rdma

I don't think we need this change. I mean it is a good test
to have that the rdma device goes away underneath nvme-rdma
but it is good for a dedicated test.

> 
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   tests/nvme/rc | 12 +++++++-----
>   1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/tests/nvme/rc b/tests/nvme/rc
> index ec0cc2d8d8cc..41f196b037d6 100644
> --- a/tests/nvme/rc
> +++ b/tests/nvme/rc
> @@ -260,18 +260,20 @@ _cleanup_nvmet() {
>   	shopt -u nullglob
>   	trap SIGINT
>   
> -	modprobe -rq nvme-"${nvme_trtype}" 2>/dev/null
> -	if [[ "${nvme_trtype}" != "loop" ]]; then
> -		modprobe -rq nvmet-"${nvme_trtype}" 2>/dev/null
> -	fi
> -	modprobe -rq nvmet 2>/dev/null
>   	if [[ "${nvme_trtype}" == "rdma" ]]; then
>   		stop_soft_rdma
>   	fi
>   	if [[ "${nvme_trtype}" == "fc" ]]; then
>   		_cleanup_fcloop "${def_local_wwnn}" "${def_local_wwpn}" \
>   			        "${def_remote_wwnn}" "${def_remote_wwpn}"
> +		modprobe -rq nvme-fcloop
>   	fi
> +
> +	modprobe -rq nvme-"${nvme_trtype}" 2>/dev/null
> +	if [[ "${nvme_trtype}" != "loop" ]]; then
> +		modprobe -rq nvmet-"${nvme_trtype}" 2>/dev/null
> +	fi
> +	modprobe -rq nvmet 2>/dev/null
>   }
>   
>   _setup_nvmet() {