netdev - Re: [PATCH net-next 1/6] net: dsa: Fix SWITCHDEV_ATTR_ID_PORT_PARENT

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Date:   Wed, 27 Sep 2017 11:31:54 -0400
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     Andrew Lunn <andrew@...n.ch>, David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next 1/6] net: dsa: Fix SWITCHDEV_ATTR_ID_PORT_PARENT_ID

Hi Andrew,

Andrew Lunn <andrew@...n.ch> writes:

> @@ -354,13 +354,16 @@ static int dsa_slave_port_attr_get(struct net_device *dev,
>  				   struct switchdev_attr *attr)
>  {
>  	struct dsa_slave_priv *p = netdev_priv(dev);
> -	struct dsa_switch *ds = p->dp->ds;
>  
>  	switch (attr->id) {
> -	case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
> -		attr->u.ppid.id_len = sizeof(ds->index);
> -		memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
> +	case SWITCHDEV_ATTR_ID_PORT_PARENT_ID: {
> +		struct dsa_switch *ds = p->dp->ds;
> +		struct dsa_switch_tree *dst = ds->dst;
> +
> +		attr->u.ppid.id_len = sizeof(dst->tree);
> +		memcpy(&attr->u.ppid.id, &dst->tree, sizeof(dst->tree));
>  		break;
> +	}
>  	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
>  		attr->u.brport_flags_support = 0;
>  		break;

I am pretty sure the kernel folks won't like blocks within case
statments. Simply declare dst = p->dp->ds->dst at the beginning.

Also keeping attr->u.ppid.id_len as memcpy's third argument like other
switchdev users do would be prefered.

Otherwise using the tree index is indeed the way to go:

Reviewed-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>


Thanks,

        Vivien