Subject: Re: [PATCH net-next v3 12/12] net: Get rid of SWITCHDEV_ATTR_ID_PORT_PARENT_ID

From: Jiri Pirko <[email-masked]>
Date: Wed, 6 Feb 2019 14:34:31 +0100

Wed, Feb 06, 2019 at 12:53:26AM CET, [email-masked] wrote:
>Now that we have a dedicated NDO for getting a port's parent ID, get rid
>of SWITCHDEV_ATTR_ID_PORT_PARENT_ID and convert all callers to use the
>NDO exclusively. This is a preliminary change to getting rid of
>switchdev_ops eventually.
>
>Signed-off-by: Florian Fainelli <[email-masked]>

[...]

>@@ -24,19 +23,12 @@ static int br_switchdev_mark_get(struct net_bridge *br, struct net_device *dev)
> 
> int nbp_switchdev_mark_set(struct net_bridge_port *p)
> {
>-	const struct net_device_ops *ops = p->dev->netdev_ops;
>-	struct switchdev_attr attr = {
>-		.orig_dev = p->dev,
>-		.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
>-	};
>-	int err;
>+	struct netdev_phys_item_id ppid = { };
>+	int err = -EOPNOTSUPP;

Pointless init.

> 
> 	ASSERT_RTNL();
> 
>-	if (ops->ndo_get_port_parent_id)
>-		err = dev_get_port_parent_id(p->dev, &attr.u.ppid, true);
>-	else
>-		err = switchdev_port_attr_get(p->dev, &attr);
>+	err = dev_get_port_parent_id(p->dev, &ppid, true);
> 	if (err) {
> 		if (err == -EOPNOTSUPP)
> 			return 0;

[...]

>@@ -1146,26 +1145,17 @@ static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
> 
> static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
> {
>-	const struct net_device_ops *ops = dev->netdev_ops;
>-	int err;
>-	struct switchdev_attr attr = {
>-		.orig_dev = dev,
>-		.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
>-		.flags = SWITCHDEV_F_NO_RECURSE,
>-	};
>+	struct netdev_phys_item_id ppid = { };
>+	int err = -EOPNOTSUPP;

Pointless init.

> 
>-	if (ops->ndo_get_port_parent_id)
>-		err = dev_get_port_parent_id(dev, &attr.u.ppid, false);
>-	else
>-		err = switchdev_port_attr_get(dev, &attr);
>+	err = dev_get_port_parent_id(dev, &ppid, false);
> 	if (err) {
> 		if (err == -EOPNOTSUPP)
> 			return 0;
> 		return err;
> 	}
> 
>-	if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
>-		    attr.u.ppid.id))
>+	if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
> 		return -EMSGSIZE;
> 
> 	return 0;

[...]

>@@ -920,15 +917,10 @@ static int vif_add(struct net *net, struct mr_table *mrt,
> 			vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0),
> 			(VIFF_TUNNEL | VIFF_REGISTER));
> 
>-	attr.orig_dev = dev;
> 	ops = dev->netdev_ops;
>-	if (ops->ndo_get_port_parent_id &&
>-	    !dev_get_port_parent_id(dev, &attr.u.ppid, true)) {
>-		memcpy(v->dev_parent_id.id, attr.u.ppid.id, attr.u.ppid.id_len);
>-		v->dev_parent_id.id_len = attr.u.ppid.id_len;
>-	} else if (!switchdev_port_attr_get(dev, &attr)) {
>-		memcpy(v->dev_parent_id.id, attr.u.ppid.id, attr.u.ppid.id_len);
>-		v->dev_parent_id.id_len = attr.u.ppid.id_len;
>+	if (!dev_get_port_parent_id(dev, &ppid, true)) {

Please split this to:
	err = dev_get_port_parent_id(dev, &ppid, true);
	if (err) {

>+		memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len);
>+		v->dev_parent_id.id_len = ppid.id_len;
> 	} else {
> 		v->dev_parent_id.id_len = 0;
> 	}

[...]