netdev - [PATCH net-next 06/12] mlxsw: spectrum

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Date:   Fri, 21 Feb 2020 19:54:09 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...lanox.com, mlxsw@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 06/12] mlxsw: spectrum_router: Introduce router lock

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

Introduce a mutex to protect the internal structure of the routing code.
A single lock is added instead of a more fine-grained and complicated
locking scheme because there is not a lot of concurrency in the routing
code.

The main motivation is remove the dependence on RTNL lock, which is
currently used by both the process pushing routes to the kernel and the
workqueue pushing the routes to the underlying device.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 4 ++++
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index fe8c1f386651..e2ddb6164f6c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -17,6 +17,7 @@
 #include <linux/refcount.h>
 #include <linux/jhash.h>
 #include <linux/net_namespace.h>
+#include <linux/mutex.h>
 #include <net/netevent.h>
 #include <net/neighbour.h>
 #include <net/arp.h>
@@ -8065,6 +8066,7 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
 	router = kzalloc(sizeof(*mlxsw_sp->router), GFP_KERNEL);
 	if (!router)
 		return -ENOMEM;
+	mutex_init(&router->lock);
 	mlxsw_sp->router = router;
 	router->mlxsw_sp = mlxsw_sp;
 
@@ -8168,6 +8170,7 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
 err_register_inet6addr_notifier:
 	unregister_inetaddr_notifier(&router->inetaddr_nb);
 err_register_inetaddr_notifier:
+	mutex_destroy(&mlxsw_sp->router->lock);
 	kfree(mlxsw_sp->router);
 	return err;
 }
@@ -8188,5 +8191,6 @@ void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp)
 	__mlxsw_sp_router_fini(mlxsw_sp);
 	unregister_inet6addr_notifier(&mlxsw_sp->router->inet6addr_nb);
 	unregister_inetaddr_notifier(&mlxsw_sp->router->inetaddr_nb);
+	mutex_destroy(&mlxsw_sp->router->lock);
 	kfree(mlxsw_sp->router);
 }
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
index 3c99db1f434b..8418dc3ae967 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h
@@ -47,6 +47,7 @@ struct mlxsw_sp_router {
 	u32 adj_discard_index;
 	bool adj_discard_index_valid;
 	struct mlxsw_sp_router_nve_decap nve_decap_config;
+	struct mutex lock; /* Protects shared router resources */
 };
 
 struct mlxsw_sp_rif_ipip_lb;
-- 
2.24.1