diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 4b0ac5d..76054a7 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -908,7 +908,8 @@
 			       attr->path_mtu);
 			goto out;
 		}
-		context->mtu_msgmax = (attr->path_mtu << 5) | 31;
+		context->mtu_msgmax = (attr->path_mtu << 5) |
+			ilog2(dev->dev->caps.max_msg_sz);
 	}
 
 	if (qp->rq.wqe_cnt)