Merge branch 'mlxsw-preparations-for-out-of-order-operations-patches'

Petr Machata says:

====================
mlxsw: Preparations for out-of-order-operations patches

The mlxsw driver currently makes the assumption that the user applies
configuration in a bottom-up manner. Thus netdevices need to be added to
the bridge before IP addresses are configured on that bridge or SVI added
on top of it. Enslaving a netdevice to another netdevice that already has
uppers is in fact forbidden by mlxsw for this reason. Despite this safety,
it is rather easy to get into situations where the offloaded configuration
is just plain wrong.

As an example, take a front panel port, configure an IP address: it gets a
RIF. Now enslave the port to a bridge, and the RIF is gone. Remove the
port from the bridge again, but the RIF never comes back. There is a number
of similar situations, where changing the configuration there and back
utterly breaks the offload.

Over the course of the following several patchsets, mlxsw code is going to
be adjusted to diminish the space of wrongly offloaded configurations.
Ideally the offload state will reflect the actual state, regardless of the
sequence of operation used to construct that state.

No functional changes are intended in this patchset yet. Rather the patches
prepare the codebase for easier introduction of functional changes in later
patchsets.

- In patch #1, extract a helper to join a RIF of a given port, if there is
  one. In patch #2, use it in a newly-added helper to join a LAG interface.

- In patches #3, #4 and #5, add helpers that abstract away the rif->dev
  access. This will make it simpler in the future to change the way the
  deduction is done. In patch #6, do this for deduction from nexthop group
  info to RIF.

- In patch #7, add a helper to destroy a RIF. So far RIF was destroyed
  simply by kfree'ing it.

- In patch #8, add a helper to check if any IP addresses are configured on
  a netdevice. This helper will be useful later.

- In patch #9, add a helper to migrate a RIF. This will be a convenient
  place to put extensions later on.

- Patch #10 move IPIP initialization up to make ipip_ops_arr available
  earlier.
====================

Link: https://lore.kernel.org/r/cover.1686581444.git.petrm@nvidia.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -4337,8 +4337,8 @@ static int mlxsw_sp_port_lag_join(struct mlxsw_sp_port *mlxsw_sp_port,
 		mlxsw_sp_port_vlan_router_leave(mlxsw_sp_port->default_vlan);
 
 	/* Join a router interface configured on the LAG, if exists */
-	err = mlxsw_sp_port_vlan_router_join(mlxsw_sp_port->default_vlan,
-					     lag_dev, extack);
+	err = mlxsw_sp_router_port_join_lag(mlxsw_sp_port, lag_dev,
+					    extack);
 	if (err)
 		goto err_router_join;
 

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

@@ -755,10 +755,6 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
 void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp);
 void mlxsw_sp_rif_macvlan_del(struct mlxsw_sp *mlxsw_sp,
 			      const struct net_device *macvlan_dev);
-int
-mlxsw_sp_port_vlan_router_join(struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan,
-			       struct net_device *l3_dev,
-			       struct netlink_ext_ack *extack);
 void
 mlxsw_sp_port_vlan_router_leave(struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan);
 void mlxsw_sp_rif_destroy_by_dev(struct mlxsw_sp *mlxsw_sp,

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h

@@ -170,5 +170,8 @@ int mlxsw_sp_ipip_ecn_encap_init(struct mlxsw_sp *mlxsw_sp);
 int mlxsw_sp_ipip_ecn_decap_init(struct mlxsw_sp *mlxsw_sp);
 struct net_device *
 mlxsw_sp_ipip_netdev_ul_dev_get(const struct net_device *ol_dev);
+int mlxsw_sp_router_port_join_lag(struct mlxsw_sp_port *mlxsw_sp_port,
+				  struct net_device *lag_dev,
+				  struct netlink_ext_ack *extack);
 
 #endif /* _MLXSW_ROUTER_H_*/