Re: [PATCH net-next v3 1/5] mlxsw: minimal: fix mlxsw_m_module_get_drvinfo() to correctly report driver name

From: Ido Schimmel <idosch@nvidia.com>
To: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Cc: Jiri Pirko <jiri@nvidia.com>,
	netdev@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>,
	linux-kernel@vger.kernel.org,
	Boris Brezillon <bbrezillon@kernel.org>,
	Arnaud Ebalard <arno@natisbad.org>,
	Srujana Challa <schalla@marvell.com>,
	Kurt Kanzenbach <kurt@linutronix.de>,
	Andrew Lunn <andrew@lunn.ch>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Vladimir Oltean <olteanv@gmail.com>,
	Michael Chan <michael.chan@broadcom.com>,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Dimitris Michailidis <dmichail@fungible.com>,
	Yisen Zhuang <yisen.zhuang@huawei.com>,
	Salil Mehta <salil.mehta@huawei.com>,
	Jesse Brandeburg <jesse.brandeburg@intel.com>,
	Tony Nguyen <anthony.l.nguyen@intel.com>,
	Sunil Goutham <sgoutham@marvell.com>,
	Linu Cherian <lcherian@marvell.com>,
	Geetha sowjanya <gakula@marvell.com>,
	Jerin Jacob <jerinj@marvell.com>, hariprasad <hkelam@marvell.com>,
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	Saeed Mahameed <saeedm@nvidia.com>,
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	Petr Machata <petrm@nvidia.com>,
	Simon Horman <simon.horman@corigine.com>,
	Shannon Nelson <snelson@pensando.io>,
	drivers@pensando.io, Ariel Elior <aelior@marvell.com>,
	Manish Chopra <manishc@marvell.com>,
	Jonathan Lemon <jonathan.lemon@gmail.com>,
	Vadim Fedorenko <vadfed@fb.com>,
	Richard Cochran <richardcochran@gmail.com>,
	Vadim Pasternak <vadimp@mellanox.com>,
	Shalom Toledo <shalomt@mellanox.com>,
	linux-crypto@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
	linux-rdma@vger.kernel.org, oss-drivers@corigine.com,
	Jiri Pirko <jiri@mellanox.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Hao Chen <chenhao288@hisilicon.com>,
	Guangbin Huang <huangguangbin2@huawei.com>,
	Minghao Chi <chi.minghao@zte.com.cn>,
	Shijith Thotton <sthotton@marvell.com>,
	Ido Schimmel <idosch@mellanox.com>
Subject: Re: [PATCH net-next v3 1/5] mlxsw: minimal: fix mlxsw_m_module_get_drvinfo() to correctly report driver name
Date: Sun, 27 Nov 2022 18:14:50 +0200	[thread overview]
Message-ID: <Y4OM+q5yqCE4/aGs@shredder> (raw)
In-Reply-To: <20221127130919.638324-2-mailhol.vincent@wanadoo.fr>

On Sun, Nov 27, 2022 at 10:09:15PM +0900, Vincent Mailhol wrote:
> Currently, mlxsw_m_module_get_drvinfo() reports the device_kind. The
> device_kind is not necessarily the same as the device_name. For
> example, the mlxsw_i2c implementation sets up the device_kind as
> ic2_client::name in [1] which indicates the type of the device
> (e.g. chip name), not the actual driver name.
> 
> Fix it so that it correctly reports the driver name.
> 
> [1] mlxsw_i2c_probe() from drivers/net/ethernet/mellanox/mlxsw/i2c.c
> Link: https://elixir.bootlin.com/linux/v6.1-rc1/source/drivers/net/ethernet/mellanox/mlxsw/i2c.c#L714

Before the series:

# ethtool -i eth2 | grep driver
driver: mlxsw_minimal

After the series:

# ethtool -i eth2 | grep driver
driver: mlxsw_minimal

See:
https://elixir.bootlin.com/linux/v6.1-rc1/source/drivers/net/ethernet/mellanox/mlxsw/minimal.c#L721

The current code is consistent with the PCI driver:
https://elixir.bootlin.com/linux/v6.1-rc1/source/drivers/net/ethernet/mellanox/mlxsw/spectrum_ethtool.c#L17

Which also correctly reports the driver name.

So I prefer to keep the code as-is.

Thanks

> 
> Fixes: 9bbd7efbc055 ("mlxsw: i2c: Extend initialization with querying firmware info")
> CC: Shalom Toledo <shalomt@mellanox.com>
> CC: Ido Schimmel <idosch@mellanox.com>
> CC: Vadim Pasternak <vadimp@mellanox.com>
> Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> ---
>  drivers/net/ethernet/mellanox/mlxsw/minimal.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/minimal.c b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
> index 6b56eadd736e..9b37ddbe0cba 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/minimal.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/minimal.c
> @@ -92,7 +92,7 @@ static void mlxsw_m_module_get_drvinfo(struct net_device *dev,
>  	struct mlxsw_m_port *mlxsw_m_port = netdev_priv(dev);
>  	struct mlxsw_m *mlxsw_m = mlxsw_m_port->mlxsw_m;
>  
> -	strscpy(drvinfo->driver, mlxsw_m->bus_info->device_kind,
> +	strscpy(drvinfo->driver, dev_driver_string(dev->dev.parent),
>  		sizeof(drvinfo->driver));
>  	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
>  		 "%d.%d.%d",
> -- 
> 2.37.4
> 