net: ndo_bridge_setlink: Add extack

Drivers may not be able to implement a VLAN addition or reconfiguration.
In those cases it's desirable to explain to the user that it was
rejected (and why).

To that end, add extack argument to ndo_bridge_setlink. Adapt all users
to that change.

Following patches will use the new argument in the bridge driver.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -1165,7 +1165,7 @@ struct dev_ifalias {
  *	entries to skb and update idx with the number of entries.
  *
  * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh,
- *			     u16 flags)
+ *			     u16 flags, struct netlink_ext_ack *extack)
  * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
  *			     struct net_device *dev, u32 filter_mask,
  *			     int nlflags)
@@ -1390,7 +1390,8 @@ struct net_device_ops {
 
 	int			(*ndo_bridge_setlink)(struct net_device *dev,
 						      struct nlmsghdr *nlh,
-						      u16 flags);
+						      u16 flags,
+						      struct netlink_ext_ack *extack);
 	int			(*ndo_bridge_getlink)(struct sk_buff *skb,
 						      u32 pid, u32 seq,
 						      struct net_device *dev,