linux-kernel - Re: [PATCH blktests v2 2/3] nvme/rc: Avoid triggering host nvme-cli autoconnect

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Message-ID: <edoiq74rpu6qejs6m3dsvtp73ypjixafp6dsncg7kga7n4uwdr@xc7mgaerwqbk>
Date:   Wed, 28 Jun 2023 21:10:52 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     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@....com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Hannes Reinecke <hare@...e.de>,
        James Smart <jsmart2021@...il.com>
Subject: Re: [PATCH blktests v2 2/3] nvme/rc: Avoid triggering host nvme-cli
 autoconnect

On Wed, Jun 28, 2023 at 05:16:22PM +0200, Daniel Wagner wrote:
> When the host has enabled the udev/systemd autoconnect services for the
> fc transport it interacts with blktests and make tests break.
> 
> nvme-cli learned to ignore connects attemps when using the --context
> command line option paired with a volatile configuration. Thus we can
> mark all the resources created by blktests and avoid any interaction
> with the systemd autoconnect scripts.
> 
> Only enabled this for the fc transport.
> 
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>  tests/nvme/rc | 81 ++++++++++++++++++++++++++++++++++++++++++++-------
>  1 file changed, 71 insertions(+), 10 deletions(-)
> 
> diff --git a/tests/nvme/rc b/tests/nvme/rc
> index 191f3e2e0c43..06d98f46b471 100644
> --- a/tests/nvme/rc
> +++ b/tests/nvme/rc
> @@ -14,8 +14,8 @@ def_remote_wwnn="0x10001100aa000001"
>  def_remote_wwpn="0x20001100aa000001"
>  def_local_wwnn="0x10001100aa000002"
>  def_local_wwpn="0x20001100aa000002"
> -def_hostnqn="$(cat /etc/nvme/hostnqn 2> /dev/null)"
> -def_hostid="$(cat /etc/nvme/hostid 2> /dev/null)"
> +def_hostnqn="nqn.2014-08.org.nvmexpress:uuid:242d4a24-2484-4a80-8234-d0169409c5e8"
> +def_hostid="242d4a24-2484-4a80-8234-d0169409c5e8"
>  nvme_trtype=${nvme_trtype:-"loop"}
>  nvme_img_size=${nvme_img_size:-"1G"}
>  nvme_num_iter=${nvme_num_iter:-"1000"}
> @@ -161,6 +161,57 @@ _nvme_calc_rand_io_size() {
>  	echo "${io_size_kb}k"
>  }
>  
> +_have_nvme_cli_context() {
> +	# ignore all non-fc transports
> +	if [[ "${nvme_trtype}" == "fc" ]] ||

This should be !=, forgot to merge a fixup to this patch.

> +	   ! nvme connect --help 2>&1 | grep -q -- '--context=<STR>' > /dev/null; then
> +		    return 1
> +	fi
> +	return 0
> +}
> +
> +_setup_nvme_cli() {
> +	local local_wwnn="${1}"
> +	local local_wwpn="${2}"
> +	local remote_wwnn="${3}"
> +	local remote_wwpn="${4}"
> +
> +	if ! _have_nvme_cli_context; then
> +		return
> +	fi
> +
> +	mkdir -p /run/nvme
> +	cat >> /run/nvme/blktests.json <<-EOF
> +	[
> +	  {
> +	    "hostnqn": "${def_hostnqn}",
> +	    "hostid": "${def_hostid}",
> +	    "subsystems": [
> +	      {
> +	        "application": "blktests",
> +	        "nqn": "blktests-subsystem-1",
> +	        "ports": [
> +	          {
> +	            "transport": "fc",
> +	            "traddr": "nn-${remote_wwnn}:pn-${remote_wwpn}",
> +	            "host_traddr": "nn-${local_wwnn}:pn-${local_wwpn}"
> +	          }
> +	        ]
> +	      }
> +	    ]
> +	  }
> +	]
> +	EOF
> +}
> +
> +_cleanup_nvme_cli() {
> +	if ! _have_nvme_cli_context; then
> +		return
> +	fi
> +
> +	rm -f /run/nvme/blktests.json
> +}
> +
>  _nvme_fcloop_add_rport() {
>  	local local_wwnn="$1"
>  	local local_wwpn="$2"
> @@ -193,6 +244,9 @@ _setup_fcloop() {
>  	local remote_wwnn="${3:-$def_remote_wwnn}"
>  	local remote_wwpn="${4:-$def_remote_wwpn}"
>  
> +	_setup_nvme_cli "${local_wwnn}" "${local_wwpn}" \
> +			"${remote_wwnn}" "${remote_wwpn}"
> +
>  	_nvme_fcloop_add_tport "${remote_wwnn}" "${remote_wwpn}"
>  	_nvme_fcloop_add_lport "${local_wwnn}" "${local_wwpn}"
>  	_nvme_fcloop_add_rport "${local_wwnn}" "${local_wwpn}" \
> @@ -235,6 +289,8 @@ _cleanup_fcloop() {
>  	_nvme_fcloop_del_lport "${local_wwnn}" "${local_wwpn}"
>  	_nvme_fcloop_del_rport "${local_wwnn}" "${local_wwpn}" \
>  			       "${remote_wwnn}" "${remote_wwpn}"
> +
> +	_cleanup_nvme_cli
>  }
>  
>  _cleanup_nvmet() {
> @@ -436,18 +492,18 @@ _nvme_connect_subsys() {
>  	trtype="$1"
>  	subsysnqn="$2"
>  
> -	ARGS=(-t "${trtype}" -n "${subsysnqn}")
> +	ARGS=(-t "${trtype}"
> +	      -n "${subsysnqn}"
> +	      --hostnqn="${hostnqn}"
> +	      --hostid="${hostid}")
> +	if _have_nvme_cli_context; then
> +		ARGS+=(--context="blktests")
> +	fi
>  	if [[ "${trtype}" == "fc" ]] ; then
>  		ARGS+=(-a "${traddr}" -w "${host_traddr}")
>  	elif [[ "${trtype}" != "loop" ]]; then
>  		ARGS+=(-a "${traddr}" -s "${trsvcid}")
>  	fi
> -	if [[ "${hostnqn}" != "$def_hostnqn" ]]; then
> -		ARGS+=(--hostnqn="${hostnqn}")
> -	fi
> -	if [[ "${hostid}" != "$def_hostid" ]]; then
> -		ARGS+=(--hostid="${hostid}")
> -	fi
>  	if [[ -n "${hostkey}" ]]; then
>  		ARGS+=(--dhchap-secret="${hostkey}")
>  	fi
> @@ -482,7 +538,12 @@ _nvme_discover() {
>  	local host_traddr="${3:-$def_host_traddr}"
>  	local trsvcid="${3:-$def_trsvcid}"
>  
> -	ARGS=(-t "${trtype}")
> +	ARGS=(-t "${trtype}"
> +	      --hostnqn="${def_hostnqn}"
> +	      --hostid="${def_hostid}")
> +	if _have_nvme_cli_context; then
> +		ARGS+=(--context="blktests")
> +	fi
>  	if [[ "${trtype}" = "fc" ]]; then
>  		ARGS+=(-a "${traddr}" -w "${host_traddr}")
>  	elif [[ "${trtype}" != "loop" ]]; then
> -- 
> 2.41.0
>