netdev - [PATCH net-next 08/17] mlxsw: spectrum: Add a replay

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Date: Wed, 19 Jul 2023 13:01:23 +0200
From: Petr Machata <petrm@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, <netdev@...r.kernel.org>
CC: Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>,
	Danielle Ratson <danieller@...dia.com>, <mlxsw@...dia.com>
Subject: [PATCH net-next 08/17] mlxsw: spectrum: Add a replay_deslavement argument to event handlers

When handling deslavement of LAG or its upper from a bridge device, when
the deslaved netdevice has an IP address, it should join the router. This
should be done after all the lowers of the LAG have left the bridge. The
replay intended to cause the device to join the router therefore cannot be
invoked unconditionally in the event handlers themselves. It can be done
right away if the handler is invoked for a sole device, but when it is
invoked repeated for each LAG lower, the replay needs to be postponed
until after this processing is done.

To that end, add a boolean parameter, replay_deslavement, to
mlxsw_sp_netdevice_port_upper_event(), mlxsw_sp_netdevice_port_vlan_event()
and one helper on the call path. Have the invocations that are done for
sole netdevices pass true, and those done for LAG lowers pass false.

Nothing depends on this flag at this point, but it removes some noise from
the patch that introduces the replay itself.

Signed-off-by: Petr Machata <petrm@...dia.com>
Reviewed-by: Danielle Ratson <danieller@...dia.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum.c    | 20 +++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 3d1a045ff470..b9ceffe258bf 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -4641,7 +4641,8 @@ static bool mlxsw_sp_bridge_vxlan_is_valid(struct net_device *br_dev,
 
 static int mlxsw_sp_netdevice_port_upper_event(struct net_device *lower_dev,
 					       struct net_device *dev,
-					       unsigned long event, void *ptr)
+					       unsigned long event, void *ptr,
+					       bool replay_deslavement)
 {
 	struct netdev_notifier_changeupper_info *info;
 	struct mlxsw_sp_port *mlxsw_sp_port;
@@ -4815,13 +4816,15 @@ static int mlxsw_sp_netdevice_port_lower_event(struct net_device *dev,
 
 static int mlxsw_sp_netdevice_port_event(struct net_device *lower_dev,
 					 struct net_device *port_dev,
-					 unsigned long event, void *ptr)
+					 unsigned long event, void *ptr,
+					 bool replay_deslavement)
 {
 	switch (event) {
 	case NETDEV_PRECHANGEUPPER:
 	case NETDEV_CHANGEUPPER:
 		return mlxsw_sp_netdevice_port_upper_event(lower_dev, port_dev,
-							   event, ptr);
+							   event, ptr,
+							   replay_deslavement);
 	case NETDEV_CHANGELOWERSTATE:
 		return mlxsw_sp_netdevice_port_lower_event(port_dev, event,
 							   ptr);
@@ -4840,7 +4843,7 @@ static int mlxsw_sp_netdevice_lag_event(struct net_device *lag_dev,
 	netdev_for_each_lower_dev(lag_dev, dev, iter) {
 		if (mlxsw_sp_port_dev_check(dev)) {
 			ret = mlxsw_sp_netdevice_port_event(lag_dev, dev, event,
-							    ptr);
+							    ptr, false);
 			if (ret)
 				return ret;
 		}
@@ -4852,7 +4855,7 @@ static int mlxsw_sp_netdevice_lag_event(struct net_device *lag_dev,
 static int mlxsw_sp_netdevice_port_vlan_event(struct net_device *vlan_dev,
 					      struct net_device *dev,
 					      unsigned long event, void *ptr,
-					      u16 vid)
+					      u16 vid, bool replay_deslavement)
 {
 	struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
 	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
@@ -4927,7 +4930,7 @@ static int mlxsw_sp_netdevice_lag_port_vlan_event(struct net_device *vlan_dev,
 		if (mlxsw_sp_port_dev_check(dev)) {
 			ret = mlxsw_sp_netdevice_port_vlan_event(vlan_dev, dev,
 								 event, ptr,
-								 vid);
+								 vid, false);
 			if (ret)
 				return ret;
 		}
@@ -4989,7 +4992,8 @@ static int mlxsw_sp_netdevice_vlan_event(struct mlxsw_sp *mlxsw_sp,
 
 	if (mlxsw_sp_port_dev_check(real_dev))
 		return mlxsw_sp_netdevice_port_vlan_event(vlan_dev, real_dev,
-							  event, ptr, vid);
+							  event, ptr, vid,
+							  true);
 	else if (netif_is_lag_master(real_dev))
 		return mlxsw_sp_netdevice_lag_port_vlan_event(vlan_dev,
 							      real_dev, event,
@@ -5168,7 +5172,7 @@ static int __mlxsw_sp_netdevice_event(struct mlxsw_sp *mlxsw_sp,
 	if (netif_is_vxlan(dev))
 		err = mlxsw_sp_netdevice_vxlan_event(mlxsw_sp, dev, event, ptr);
 	else if (mlxsw_sp_port_dev_check(dev))
-		err = mlxsw_sp_netdevice_port_event(dev, dev, event, ptr);
+		err = mlxsw_sp_netdevice_port_event(dev, dev, event, ptr, true);
 	else if (netif_is_lag_master(dev))
 		err = mlxsw_sp_netdevice_lag_event(dev, event, ptr);
 	else if (is_vlan_dev(dev))
-- 
2.40.1