netdev - [patch net-next v3 11/12] mlxsw: spectrum_router: Request a dump of FIB tables during init

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Date:   Wed, 30 Nov 2016 11:09:05 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com, eladr@...lanox.com,
        yotamg@...lanox.com, nogahf@...lanox.com, arkadis@...lanox.com,
        ogerlitz@...lanox.com, roopa@...ulusnetworks.com,
        dsa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
        andy@...yhouse.net, vivien.didelot@...oirfairelinux.com,
        andrew@...n.ch, f.fainelli@...il.com, alexander.h.duyck@...el.com,
        hannes@...essinduktion.org, kaber@...sh.net
Subject: [patch net-next v3 11/12] mlxsw: spectrum_router: Request a dump of FIB tables during init

From: Ido Schimmel <idosch@...lanox.com>

Make sure the device has a complete view of the FIB tables by invoking
their dump during module init.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 14bed1d..d176047 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -2027,8 +2027,23 @@ static int mlxsw_sp_router_fib_event(struct notifier_block *nb,
 	return NOTIFY_DONE;
 }
 
+static void mlxsw_sp_router_fib_dump_flush(struct notifier_block *nb)
+{
+	struct mlxsw_sp *mlxsw_sp = container_of(nb, struct mlxsw_sp, fib_nb);
+
+	/* Flush pending FIB notifications and then flush the device's
+	 * table before requesting another dump. Do that with RTNL held,
+	 * as FIB notification block is already registered.
+	 */
+	mlxsw_core_flush_owq();
+	rtnl_lock();
+	mlxsw_sp_router_fib_flush(mlxsw_sp);
+	rtnl_unlock();
+}
+
 int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp)
 {
+	fib_dump_cb_t *cb = mlxsw_sp_router_fib_dump_flush;
 	int err;
 
 	INIT_LIST_HEAD(&mlxsw_sp->router.nexthop_neighs_list);
@@ -2048,8 +2063,16 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp)
 
 	mlxsw_sp->fib_nb.notifier_call = mlxsw_sp_router_fib_event;
 	register_fib_notifier(&mlxsw_sp->fib_nb);
+	if (!fib_notifier_dump(&mlxsw_sp->fib_nb, &init_net, cb)) {
+		err = -EBUSY;
+		goto err_fib_notifier_dump;
+	}
+
 	return 0;
 
+err_fib_notifier_dump:
+	unregister_fib_notifier(&mlxsw_sp->fib_nb);
+	mlxsw_sp_neigh_fini(mlxsw_sp);
 err_neigh_init:
 	mlxsw_sp_vrs_fini(mlxsw_sp);
 err_vrs_init:
-- 
2.7.4