Subject: Re: [PATCH net-next v4 19/24] switchdev: add new swdev_port_bridge_getlink

From: roopa <[email-masked]>
Date: Mon, 13 Apr 2015 22:47:11 -0700

On 4/12/15, 11:17 PM, [email-masked] wrote:
> From: Scott Feldman <[email-masked]>
>
> Like bridge_setlink, add swdev wrapper to handle bridge_getlink and call into
> port driver to get port attrs.  For now, only BR_LEARNING and BR_LEARNING_SYNC
> are returned.  To add more, we'll probably want to break away from
> ndo_dflt_bridge_getlink() and build the netlink skb directly in the swdev code.
>
> Signed-off-by: Scott Feldman <[email-masked]>
> ---
>   include/net/switchdev.h   |    9 +++++++++
>   net/switchdev/switchdev.c |   27 +++++++++++++++++++++++++++
>   2 files changed, 36 insertions(+)
>
> diff --git a/include/net/switchdev.h b/include/net/switchdev.h
> index 8c9814f..d04322e 100644
> --- a/include/net/switchdev.h
> +++ b/include/net/switchdev.h
> @@ -121,6 +121,8 @@ int swdev_port_attr_get(struct net_device *dev, struct swdev_attr *attr);
>   int swdev_port_attr_set(struct net_device *dev, struct swdev_attr *attr);
>   int swdev_port_obj_add(struct net_device *dev, struct swdev_obj *obj);
>   int swdev_port_obj_del(struct net_device *dev, struct swdev_obj *obj);
> +int swdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
> +			      struct net_device *dev, u32 filter_mask);
>   int swdev_port_bridge_setlink(struct net_device *dev, struct nlmsghdr *nlh,
>   			      u16 flags);
>   int swdev_port_bridge_dellink(struct net_device *dev, struct nlmsghdr *nlh,
> @@ -161,6 +163,13 @@ static inline int swdev_port_obj_del(struct net_device *dev,
>   	return -EOPNOTSUPP;
>   }
>   
> +static inline int swdev_port_bridge_getlink(struct sk_buff *skb, u32 pid,
> +					    u32 seq, struct net_device *dev,
> +					    u32 filter_mask)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
>   static inline int swdev_port_bridge_setlink(struct net_device *dev,
>   					    struct nlmsghdr *nlh, u16 flags)
>   {
> diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
> index ae0ed06..6866e0c 100644
> --- a/net/switchdev/switchdev.c
> +++ b/net/switchdev/switchdev.c
> @@ -371,6 +371,33 @@ int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev,
>   }
>   EXPORT_SYMBOL_GPL(call_netdev_switch_notifiers);
>   
> +/**
> + *	swdev_port_bridge_getlink - Get bridge port attributes
> + *
> + *	@dev: port device
> + *
> + *	Called for SELF on rtnl_bridge_getlink to get bridge port
> + *	attributes.
> + */
> +int swdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
> +			      struct net_device *dev, u32 filter_mask)
> +{
> +	struct swdev_attr attr = {
> +		.id = SWDEV_ATTR_PORT_BRIDGE_FLAGS,
> +	};
> +	u16 mode = BRIDGE_MODE_UNDEF;
> +	u32 mask = BR_LEARNING | BR_LEARNING_SYNC;
> +	int err;
> +
> +	err = swdev_port_attr_get(dev, &attr);
> +	if (err)
> +		return err;
> +
> +	return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
> +				       attr.brport_flags, mask);
> +}
> +EXPORT_SYMBOL_GPL(swdev_port_bridge_getlink);

This should ideally get vlans as well because setlink/dellink supports 
add/del vlans.
This can however be an incremental patch. I think this was the point 
arad was making as well some time back.