mlxsw: Convert RIF-has-netdevice queries to a dedicated helper

In a number of places, a netdevice underlying a RIF is obtained only to
check if it a NULL pointer. In order to clean up the interface between the
router and the other modules, add a new helper to specifically answer this
question, and convert the relevant uses to this new interface.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_dpipe.c

@@ -221,7 +221,7 @@ mlxsw_sp_dpipe_table_erif_entries_dump(void *priv, bool counters_enabled,
 	for (; i < rif_count; i++) {
 		struct mlxsw_sp_rif *rif = mlxsw_sp_rif_by_index(mlxsw_sp, i);
 
-		if (!rif || !mlxsw_sp_rif_dev(rif))
+		if (!rif || !mlxsw_sp_rif_has_dev(rif))
 			continue;
 		err = mlxsw_sp_erif_entry_get(mlxsw_sp, &entry, rif,
 					      counters_enabled);

drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c

@@ -720,7 +720,7 @@ int mlxsw_sp_mr_rif_add(struct mlxsw_sp_mr_table *mr_table,
 	const struct net_device *rif_dev = mlxsw_sp_rif_dev(rif);
 	struct mlxsw_sp_mr_vif *mr_vif;
 
-	if (!rif_dev)
+	if (!mlxsw_sp_rif_has_dev(rif))
 		return 0;
 
 	mr_vif = mlxsw_sp_mr_dev_vif_lookup(mr_table, rif_dev);
@@ -736,7 +736,7 @@ void mlxsw_sp_mr_rif_del(struct mlxsw_sp_mr_table *mr_table,
 	const struct net_device *rif_dev = mlxsw_sp_rif_dev(rif);
 	struct mlxsw_sp_mr_vif *mr_vif;
 
-	if (!rif_dev)
+	if (!mlxsw_sp_rif_has_dev(rif))
 		return;
 
 	mr_vif = mlxsw_sp_mr_dev_vif_lookup(mr_table, rif_dev);
@@ -754,7 +754,7 @@ void mlxsw_sp_mr_rif_mtu_update(struct mlxsw_sp_mr_table *mr_table,
 	struct mlxsw_sp_mr *mr = mlxsw_sp->mr;
 	struct mlxsw_sp_mr_vif *mr_vif;
 
-	if (!rif_dev)
+	if (!mlxsw_sp_rif_has_dev(rif))
 		return;
 
 	/* Search for a VIF that use that RIF */

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -8080,6 +8080,11 @@ const struct net_device *mlxsw_sp_rif_dev(const struct mlxsw_sp_rif *rif)
 	return rif->dev;
 }
 
+bool mlxsw_sp_rif_has_dev(const struct mlxsw_sp_rif *rif)
+{
+	return !!mlxsw_sp_rif_dev(rif);
+}
+
 static void mlxsw_sp_rif_push_l3_stats(struct mlxsw_sp_rif *rif)
 {
 	struct rtnl_hw_stats64 stats = {};

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h

@@ -94,6 +94,7 @@ u16 mlxsw_sp_ipip_lb_ul_rif_id(const struct mlxsw_sp_rif_ipip_lb *lb_rif);
 u32 mlxsw_sp_ipip_dev_ul_tb_id(const struct net_device *ol_dev);
 int mlxsw_sp_rif_dev_ifindex(const struct mlxsw_sp_rif *rif);
 const struct net_device *mlxsw_sp_rif_dev(const struct mlxsw_sp_rif *rif);
+bool mlxsw_sp_rif_has_dev(const struct mlxsw_sp_rif *rif);
 int mlxsw_sp_rif_counter_value_get(struct mlxsw_sp *mlxsw_sp,
 				   struct mlxsw_sp_rif *rif,
 				   enum mlxsw_sp_rif_counter_dir dir,