linux-kernel - Re: [PATCH net-next v3 7/8] net: switchdev: Replace port attr set SDO with a notification

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Date:   Wed, 27 Feb 2019 20:16:31 +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 v3 7/8] net: switchdev: Replace port attr set SDO
 with a notification

On Wed, Feb 27, 2019 at 11:44:31AM -0800, Florian Fainelli wrote:
> Drop switchdev_ops.switchdev_port_attr_set. Drop the uses of this field
> from all clients, which were migrated to use switchdev notification in
> the previous patches.
> 
> Add a new function switchdev_port_attr_notify() that sends the switchdev
> notifications SWITCHDEV_PORT_ATTR_SET and calls the blocking (process)
> notifier chain.
> 
> We have one odd case within net/bridge/br_switchdev.c with the
> SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS attribute identifier that
> requires executing from atomic context, we deal with that one
> specifically.
> 
> Drop __switchdev_port_attr_set() and update switchdev_port_attr_set()
> likewise.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Reviewed-by: Ido Schimmel <idosch@...lanox.com>

One small nit that you can address in a follow-up:

> @@ -67,12 +67,18 @@ int br_switchdev_set_port_flag(struct net_bridge_port *p,
>  		.id = SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS,
>  		.u.brport_flags = mask,
>  	};
> +	struct switchdev_notifier_port_attr_info info = {
> +		.attr = &attr,
> +	};
>  	int err;
>  
>  	if (mask & ~BR_PORT_FLAGS_HW_OFFLOAD)
>  		return 0;
>  
> -	err = switchdev_port_attr_set(p->dev, &attr);
> +	/* We run from atomic context here */
> +	err = call_switchdev_notifiers(SWITCHDEV_PORT_ATTR_SET, p->dev,
> +				       &info.info, NULL);
> +	err = notifier_to_errno(err);
>  	if (err == -EOPNOTSUPP)
>  		return 0;

This check can be removed. The code below checks `err` and fails the
operation in case of error.