IB/mlx5: Verify that Q counters are supported

commit 45bded2c upstream.

Make sure that the Q counters are supported by the FW before trying
to allocate/deallocte them, this will avoid driver load failure when
they aren't supported by the FW.

Fixes: 0837e86a ('IB/mlx5: Add per port counters')
Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/infiniband/hw/mlx5/main.c

@@ -3233,9 +3233,11 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
 	if (err)
 		goto err_rsrc;
 
+	if (MLX5_CAP_GEN(dev->mdev, max_qp_cnt)) {
 		err = mlx5_ib_alloc_q_counters(dev);
 		if (err)
 			goto err_odp;
+	}
 
 	err = ib_register_device(&dev->ib_dev, NULL);
 	if (err)
@@ -3263,6 +3265,7 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
 	ib_unregister_device(&dev->ib_dev);
 
 err_q_cnt:
+	if (MLX5_CAP_GEN(dev->mdev, max_qp_cnt))
 		mlx5_ib_dealloc_q_counters(dev);
 
 err_odp:
@@ -3293,6 +3296,7 @@ static void mlx5_ib_remove(struct mlx5_core_dev *mdev, void *context)
 
 	mlx5_remove_netdev_notifier(dev);
 	ib_unregister_device(&dev->ib_dev);
+	if (MLX5_CAP_GEN(dev->mdev, max_qp_cnt))
 		mlx5_ib_dealloc_q_counters(dev);
 	destroy_umrc_res(dev);
 	mlx5_ib_odp_remove_one(dev);