IB/mlx4: Add contig support for control objects

Taking advantage of the optimization which was introduced in previous
commit ("IB/mlx4: Use optimal numbers of MTT entries") to optimize the
MTT usage for QP and CQ.
Signed-off-by: Guy Levi <guyle@mellanox.com>
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx4/cq.c

@@ -140,14 +140,18 @@ static int mlx4_ib_get_cq_umem(struct mlx4_ib_dev *dev, struct ib_ucontext *cont
 {
 	int err;
 	int cqe_size = dev->dev->caps.cqe_size;
+	int shift;
+	int n;
 
 	*umem = ib_umem_get(context, buf_addr, cqe * cqe_size,
 			    IB_ACCESS_LOCAL_WRITE, 1);
 	if (IS_ERR(*umem))
 		return PTR_ERR(*umem);
 
-	err = mlx4_mtt_init(dev->dev, ib_umem_page_count(*umem),
-			    (*umem)->page_shift, &buf->mtt);
+	n = ib_umem_page_count(*umem);
+	shift = mlx4_ib_umem_calc_optimal_mtt_size(*umem, 0, &n);
+	err = mlx4_mtt_init(dev->dev, n, shift, &buf->mtt);
+
 	if (err)
 		goto err_buf;
 

drivers/infiniband/hw/mlx4/mlx4_ib.h

@@ -935,5 +935,7 @@ struct ib_rwq_ind_table
 			      struct ib_rwq_ind_table_init_attr *init_attr,
 			      struct ib_udata *udata);
 int mlx4_ib_destroy_rwq_ind_table(struct ib_rwq_ind_table *wq_ind_table);
+int mlx4_ib_umem_calc_optimal_mtt_size(struct ib_umem *umem, u64 start_va,
+				       int *num_of_mtts);
 
 #endif /* MLX4_IB_H */

drivers/infiniband/hw/mlx4/mr.c

@@ -254,9 +254,8 @@ int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt,
  * middle already handled as part of mtt shift calculation for both their start
  * & end addresses.
  */
-static int mlx4_ib_umem_calc_optimal_mtt_size(struct ib_umem *umem,
-					      u64 start_va,
-					      int *num_of_mtts)
+int mlx4_ib_umem_calc_optimal_mtt_size(struct ib_umem *umem, u64 start_va,
+				       int *num_of_mtts)
 {
 	u64 block_shift = MLX4_MAX_MTT_SHIFT;
 	u64 min_shift = umem->page_shift;

drivers/infiniband/hw/mlx4/qp.c

@@ -1038,6 +1038,8 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
 			struct mlx4_ib_create_wq wq;
 		} ucmd;
 		size_t copy_len;
+		int shift;
+		int n;
 
 		copy_len = (src == MLX4_IB_QP_SRC) ?
 			   sizeof(struct mlx4_ib_create_qp) :
@@ -1100,8 +1102,10 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
 			goto err;
 		}
 
-		err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem),
-				    qp->umem->page_shift, &qp->mtt);
+		n = ib_umem_page_count(qp->umem);
+		shift = mlx4_ib_umem_calc_optimal_mtt_size(qp->umem, 0, &n);
+		err = mlx4_mtt_init(dev->dev, n, shift, &qp->mtt);
+
 		if (err)
 			goto err_buf;