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IB/mlx5: Fix blue flame buffer size calculation

PATCH New Leon Romanovsky 1 participant 1 message Feb 8, 2017

Subsystems (2)
InfiniBand Mellanox MLX5 IB driver
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Leon Romanovsky

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PATCH 1/1 IB/mlx5: Fix blue flame buffer size calculation

From: Eli Cohen <eli-VPRAkNaXOzVWk0Htik3J/[email protected]>

A blue flame register is comprised of two buffers of equal size.

Fixes 5fe9dec0d0454 ("IB/mlx5: Use blue flame register allocator in mlx5_ib")
Signed-off-by Eli Cohen <eli-VPRAkNaXOzVWk0Htik3J/[email protected]>
Reviewed-by Noa Osherovich <noaos-VPRAkNaXOzVWk0Htik3J/[email protected]>
Reviewed-by Matan Barak <matanb-VPRAkNaXOzVWk0Htik3J/[email protected]>
Signed-off-by Leon Romanovsky <[email protected]>
---
 drivers/infiniband/hw/mlx5/qp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
drivers/infiniband/hw/mlx5/qp.c +4 -1
index e22d9572ae8f..38e3332791f2 100644
@@ -905,7 +905,10 @@ static int create_kernel_qp(struct mlx5_ib_dev *dev,
 	else
 		qp->bf.bfreg = &dev->bfreg;
 
-	qp->bf.buf_size = 1 << MLX5_CAP_GEN(dev->mdev, log_bf_reg_size);
+	/* We need to divide by two since each register is comprised of
+	 * two buffers of identical size, namely odd and even
+	 */
+	qp->bf.buf_size = 1 << MLX5_CAP_GEN(dev->mdev, log_bf_reg_size) / 2;
 	uar_index = qp->bf.bfreg->index;
 
 	err = calc_sq_size(dev, init_attr, qp);

--
2.11.1

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