net/mlx5: Bridge, extract code to lookup parent bridge of port

The pattern when function looks up a port by vport_num+vhca_id tuple in
order to just obtain its parent bridge is repeated multiple times in
bridge.c file. Further commits in this series use the pattern even more.
Extract the pattern to standalone mlx5_esw_bridge_from_port_lookup()
function to improve code readability.

This commits doesn't change functionality.
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/esw/bridge.c

@@ -933,6 +933,19 @@ static void mlx5_esw_bridge_port_erase(struct mlx5_esw_bridge_port *port,
 	xa_erase(&br_offloads->ports, mlx5_esw_bridge_port_key(port));
 }
 
+static struct mlx5_esw_bridge *
+mlx5_esw_bridge_from_port_lookup(u16 vport_num, u16 esw_owner_vhca_id,
+				 struct mlx5_esw_bridge_offloads *br_offloads)
+{
+	struct mlx5_esw_bridge_port *port;
+
+	port = mlx5_esw_bridge_port_lookup(vport_num, esw_owner_vhca_id, br_offloads);
+	if (!port)
+		return NULL;
+
+	return port->bridge;
+}
+
 static void mlx5_esw_bridge_fdb_entry_refresh(struct mlx5_esw_bridge_fdb_entry *entry)
 {
 	trace_mlx5_esw_bridge_fdb_entry_refresh(entry);
@@ -1388,28 +1401,26 @@ mlx5_esw_bridge_fdb_entry_init(struct net_device *dev, u16 vport_num, u16 esw_ow
 int mlx5_esw_bridge_ageing_time_set(u16 vport_num, u16 esw_owner_vhca_id, unsigned long ageing_time,
 				    struct mlx5_esw_bridge_offloads *br_offloads)
 {
-	struct mlx5_esw_bridge_port *port;
+	struct mlx5_esw_bridge *bridge;
 
-	port = mlx5_esw_bridge_port_lookup(vport_num, esw_owner_vhca_id, br_offloads);
-	if (!port)
+	bridge = mlx5_esw_bridge_from_port_lookup(vport_num, esw_owner_vhca_id, br_offloads);
+	if (!bridge)
 		return -EINVAL;
 
-	port->bridge->ageing_time = clock_t_to_jiffies(ageing_time);
+	bridge->ageing_time = clock_t_to_jiffies(ageing_time);
 	return 0;
 }
 
 int mlx5_esw_bridge_vlan_filtering_set(u16 vport_num, u16 esw_owner_vhca_id, bool enable,
 				       struct mlx5_esw_bridge_offloads *br_offloads)
 {
-	struct mlx5_esw_bridge_port *port;
 	struct mlx5_esw_bridge *bridge;
 	bool filtering;
 
-	port = mlx5_esw_bridge_port_lookup(vport_num, esw_owner_vhca_id, br_offloads);
-	if (!port)
+	bridge = mlx5_esw_bridge_from_port_lookup(vport_num, esw_owner_vhca_id, br_offloads);
+	if (!bridge)
 		return -EINVAL;
 
-	bridge = port->bridge;
 	filtering = bridge->flags & MLX5_ESW_BRIDGE_VLAN_FILTERING_FLAG;
 	if (filtering == enable)
 		return 0;
@@ -1426,15 +1437,13 @@ int mlx5_esw_bridge_vlan_filtering_set(u16 vport_num, u16 esw_owner_vhca_id, boo
 int mlx5_esw_bridge_vlan_proto_set(u16 vport_num, u16 esw_owner_vhca_id, u16 proto,
 				   struct mlx5_esw_bridge_offloads *br_offloads)
 {
-	struct mlx5_esw_bridge_port *port;
 	struct mlx5_esw_bridge *bridge;
 
-	port = mlx5_esw_bridge_port_lookup(vport_num, esw_owner_vhca_id,
-					   br_offloads);
-	if (!port)
+	bridge = mlx5_esw_bridge_from_port_lookup(vport_num, esw_owner_vhca_id,
+						  br_offloads);
+	if (!bridge)
 		return -EINVAL;
 
-	bridge = port->bridge;
 	if (bridge->vlan_proto == proto)
 		return 0;
 	if (proto != ETH_P_8021Q && proto != ETH_P_8021AD) {
@@ -1626,14 +1635,12 @@ void mlx5_esw_bridge_fdb_update_used(struct net_device *dev, u16 vport_num, u16
 				     struct switchdev_notifier_fdb_info *fdb_info)
 {
 	struct mlx5_esw_bridge_fdb_entry *entry;
-	struct mlx5_esw_bridge_port *port;
 	struct mlx5_esw_bridge *bridge;
 
-	port = mlx5_esw_bridge_port_lookup(vport_num, esw_owner_vhca_id, br_offloads);
-	if (!port)
+	bridge = mlx5_esw_bridge_from_port_lookup(vport_num, esw_owner_vhca_id, br_offloads);
+	if (!bridge)
 		return;
 
-	bridge = port->bridge;
 	entry = mlx5_esw_bridge_fdb_lookup(bridge, fdb_info->addr, fdb_info->vid);
 	if (!entry) {
 		esw_debug(br_offloads->esw->dev,
@@ -1680,14 +1687,12 @@ void mlx5_esw_bridge_fdb_remove(struct net_device *dev, u16 vport_num, u16 esw_o
 {
 	struct mlx5_eswitch *esw = br_offloads->esw;
 	struct mlx5_esw_bridge_fdb_entry *entry;
-	struct mlx5_esw_bridge_port *port;
 	struct mlx5_esw_bridge *bridge;
 
-	port = mlx5_esw_bridge_port_lookup(vport_num, esw_owner_vhca_id, br_offloads);
-	if (!port)
+	bridge = mlx5_esw_bridge_from_port_lookup(vport_num, esw_owner_vhca_id, br_offloads);
+	if (!bridge)
 		return;
 
-	bridge = port->bridge;
 	entry = mlx5_esw_bridge_fdb_lookup(bridge, fdb_info->addr, fdb_info->vid);
 	if (!entry) {
 		esw_debug(esw->dev,