netdev - [PATCH net-next 09/12] mlxsw: spectrum_switchdev: Handle SWITCHDEV_PORT_OBJ_ADD/

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Message-ID: <4a702bbc647469cfbc7041a085ba2a135d7c3ee9.1542927590.git.petrm@mellanox.com>
Date:   Thu, 22 Nov 2018 23:29:57 +0000
From:   Petr Machata <petrm@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>
CC:     Jiri Pirko <jiri@...lanox.com>, Ido Schimmel <idosch@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "ruxandra.radulescu@....com" <ruxandra.radulescu@....com>,
        "ioana.ciornei@....com" <ioana.ciornei@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "ivecera@...hat.com" <ivecera@...hat.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "vivien.didelot@...oirfairelinux.com" 
        <vivien.didelot@...oirfairelinux.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>
Subject: [PATCH net-next 09/12] mlxsw: spectrum_switchdev: Handle
 SWITCHDEV_PORT_OBJ_ADD/_DEL

Following patches will change the way of distributing port object
changes from a switchdev operation to a switchdev notifier. The
switchdev code currently recursively descends through layers of lower
devices, eventually calling the op on a front-panel port device. The
notifier will instead be sent referencing the bridge port device, which
may be a stacking device that's one of front-panel ports uppers, or a
completely unrelated device.

To handle SWITCHDEV_PORT_OBJ_ADD and _DEL, subscribe to the blocking
notifier chain. Dispatch to mlxsw_sp_port_obj_add() resp. _del() to
maintain the behavior that the switchdev operation based code currently
has. Defer to switchdev_handle_port_obj_add() / _del() to handle the
recursive descend, because mlxsw supports a number of upper types.

Signed-off-by: Petr Machata <petrm@...lanox.com>
Reviewed-by: Ido Schimmel <idosch@...lanox.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_switchdev.c   | 45 +++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index b32a5ee57fb9..3756aaecd39c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -3118,6 +3118,32 @@ static struct notifier_block mlxsw_sp_switchdev_notifier = {
 	.notifier_call = mlxsw_sp_switchdev_event,
 };
 
+static int mlxsw_sp_switchdev_blocking_event(struct notifier_block *unused,
+					     unsigned long event, void *ptr)
+{
+	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
+	int err;
+
+	switch (event) {
+	case SWITCHDEV_PORT_OBJ_ADD:
+		err = switchdev_handle_port_obj_add(dev, ptr,
+						    mlxsw_sp_port_dev_check,
+						    mlxsw_sp_port_obj_add);
+		return notifier_from_errno(err);
+	case SWITCHDEV_PORT_OBJ_DEL:
+		err = switchdev_handle_port_obj_del(dev, ptr,
+						    mlxsw_sp_port_dev_check,
+						    mlxsw_sp_port_obj_del);
+		return notifier_from_errno(err);
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block mlxsw_sp_switchdev_blocking_notifier = {
+	.notifier_call = mlxsw_sp_switchdev_blocking_event,
+};
+
 u8
 mlxsw_sp_bridge_port_stp_state(struct mlxsw_sp_bridge_port *bridge_port)
 {
@@ -3127,6 +3153,7 @@ mlxsw_sp_bridge_port_stp_state(struct mlxsw_sp_bridge_port *bridge_port)
 static int mlxsw_sp_fdb_init(struct mlxsw_sp *mlxsw_sp)
 {
 	struct mlxsw_sp_bridge *bridge = mlxsw_sp->bridge;
+	struct notifier_block *nb;
 	int err;
 
 	err = mlxsw_sp_ageing_set(mlxsw_sp, MLXSW_SP_DEFAULT_AGEING_TIME);
@@ -3141,17 +3168,33 @@ static int mlxsw_sp_fdb_init(struct mlxsw_sp *mlxsw_sp)
 		return err;
 	}
 
+	nb = &mlxsw_sp_switchdev_blocking_notifier;
+	err = register_switchdev_blocking_notifier(nb);
+	if (err) {
+		dev_err(mlxsw_sp->bus_info->dev, "Failed to register switchdev blocking notifier\n");
+		goto err_register_switchdev_blocking_notifier;
+	}
+
 	INIT_DELAYED_WORK(&bridge->fdb_notify.dw, mlxsw_sp_fdb_notify_work);
 	bridge->fdb_notify.interval = MLXSW_SP_DEFAULT_LEARNING_INTERVAL;
 	mlxsw_sp_fdb_notify_work_schedule(mlxsw_sp);
 	return 0;
+
+err_register_switchdev_blocking_notifier:
+	unregister_switchdev_notifier(&mlxsw_sp_switchdev_notifier);
+	return err;
 }
 
 static void mlxsw_sp_fdb_fini(struct mlxsw_sp *mlxsw_sp)
 {
+	struct notifier_block *nb;
+
 	cancel_delayed_work_sync(&mlxsw_sp->bridge->fdb_notify.dw);
-	unregister_switchdev_notifier(&mlxsw_sp_switchdev_notifier);
 
+	nb = &mlxsw_sp_switchdev_blocking_notifier;
+	unregister_switchdev_blocking_notifier(nb);
+
+	unregister_switchdev_notifier(&mlxsw_sp_switchdev_notifier);
 }
 
 int mlxsw_sp_switchdev_init(struct mlxsw_sp *mlxsw_sp)
-- 
2.4.11