netdev - Re: [PATCH net-next 4/8] mlxsw: spectrum_switchdev: Handle SWITCHDEV_PORT_ATTR

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Message-ID: <20190223103651.GC13070@splinter>
Date:   Sat, 23 Feb 2019 10:36:54 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     Florian Fainelli <f.fainelli@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        "moderated list:ETHERNET BRIDGE" <bridge@...ts.linux-foundation.org>,
        Jiri Pirko <jiri@...lanox.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>
Subject: Re: [PATCH net-next 4/8] mlxsw: spectrum_switchdev: Handle
 SWITCHDEV_PORT_ATTR_SET

On Fri, Feb 22, 2019 at 03:59:22PM -0800, Florian Fainelli wrote:
> Following patches will change the way we communicate setting a port's
> attribute and use a notifier to perform those tasks.
> 
> Prepare mlxsw to support receiving notifier events targeting
> SWITCHDEV_PORT_ATTR_SET and utilize the switchdev_handle_port_attr_set()
> to handle stacking of devices.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  .../net/ethernet/mellanox/mlxsw/spectrum_switchdev.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
> index 766f5b5f1cf5..c1aedfea3a31 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
> @@ -3123,6 +3123,13 @@ static int mlxsw_sp_switchdev_event(struct notifier_block *unused,
>  	struct net_device *br_dev;
>  	int err;
>  
> +	if (event == SWITCHDEV_PORT_ATTR_SET) {
> +		err = switchdev_handle_port_attr_set(dev, ptr,
> +						     mlxsw_sp_port_dev_check,
> +						     mlxsw_sp_port_attr_set);
> +		return notifier_from_errno(err);

I don't think this code is ever executed. And if it was executed, we
would have problems because switchdev_handle_port_attr_set() might
block.

> +	}
> +
>  	/* Tunnel devices are not our uppers, so check their master instead */
>  	br_dev = netdev_master_upper_dev_get_rcu(dev);
>  	if (!br_dev)
> @@ -3446,6 +3453,11 @@ static int mlxsw_sp_switchdev_blocking_event(struct notifier_block *unused,
>  							mlxsw_sp_port_dev_check,
>  							mlxsw_sp_port_obj_del);
>  		return notifier_from_errno(err);
> +	case SWITCHDEV_PORT_ATTR_SET:
> +		err = switchdev_handle_port_attr_set(dev, ptr,
> +						     mlxsw_sp_port_dev_check,
> +						     mlxsw_sp_port_attr_set);
> +		return notifier_from_errno(err);
>  	}
>  
>  	return NOTIFY_DONE;
> -- 
> 2.17.1
>