IB/mlx5: Check supported flow table size

Check that the required flow table size is supported
by device. Return ENOMEM error if no space left.

In addition change the create flow table routine
to return ENOMEM instead of ENOSPC.

Fixes: 038d2ef87572 ('IB/mlx5: Add flow steering support')
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/main.c

@@ -2049,11 +2049,14 @@ static struct mlx5_ib_flow_prio *get_flow_table(struct mlx5_ib_dev *dev,
 	struct mlx5_flow_namespace *ns = NULL;
 	struct mlx5_ib_flow_prio *prio;
 	struct mlx5_flow_table *ft;
+	int max_table_size;
 	int num_entries;
 	int num_groups;
 	int priority;
 	int err = 0;
 
+	max_table_size = BIT(MLX5_CAP_FLOWTABLE_NIC_RX(dev->mdev,
+						       log_max_ft_size));
 	if (flow_attr->type == IB_FLOW_ATTR_NORMAL) {
 		if (flow_is_multicast_only(flow_attr) &&
 		    !dont_trap)
@@ -2092,6 +2095,9 @@ static struct mlx5_ib_flow_prio *get_flow_table(struct mlx5_ib_dev *dev,
 	if (!ns)
 		return ERR_PTR(-ENOTSUPP);
 
+	if (num_entries > max_table_size)
+		return ERR_PTR(-ENOMEM);
+
 	ft = prio->flow_table;
 	if (!ft) {
 		ft = mlx5_create_auto_grouped_flow_table(ns, priority,
@@ -2316,7 +2322,7 @@ static struct ib_flow *mlx5_ib_create_flow(struct ib_qp *qp,
 	int err;
 
 	if (flow_attr->priority > MLX5_IB_FLOW_LAST_PRIO)
-		return ERR_PTR(-ENOSPC);
+		return ERR_PTR(-ENOMEM);
 
 	if (domain != IB_FLOW_DOMAIN_USER ||
 	    flow_attr->port > MLX5_CAP_GEN(dev->mdev, num_ports) ||