linux-kernel - Re: [PATCH net-next v2 7/8] net: switchdev: Replace port attr set SDO with a notification

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Date:   Wed, 27 Feb 2019 12:28:34 +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 v2 7/8] net: switchdev: Replace port attr set SDO
 with a notification

On Tue, Feb 26, 2019 at 05:14:26PM -0800, Florian Fainelli wrote:
> diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
> index af57c4a2b78a..b7988d49d708 100644
> --- a/net/bridge/br_switchdev.c
> +++ b/net/bridge/br_switchdev.c
> @@ -67,12 +67,17 @@ 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);
>  	if (err == -EOPNOTSUPP)

Florian, this needs to use notifier_to_errno() and check for any error.
With the ops, `-EOPNOTSUPP` was returned for devices that did not
implement `switchdev_ops`. Now they will simply not listen / reply to
the notification.

>  		return 0;