netdev - Re: [PATCH rdma-next v1 2/3] RDMA/mlx5: Separate DCI QP creation logic

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Date:   Tue, 22 Jun 2021 15:45:56 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Lior Nahmanson <liorna@...dia.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Meir Lichtinger <meirl@...dia.com>, netdev@...r.kernel.org,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [PATCH rdma-next v1 2/3] RDMA/mlx5: Separate DCI QP creation
 logic

On Mon, Jun 21, 2021 at 10:06:15AM +0300, Leon Romanovsky wrote:
> From: Lior Nahmanson <liorna@...dia.com>
> 
> This patch isolates DCI QP creation logic to separate function, so this
> change will reduce complexity when adding new features to DCI QP without
> interfering with other QP types.
> 
> The code was copied from create_user_qp() while taking only DCI relevant bits.
> 
> Reviewed-by: Meir Lichtinger <meirl@...dia.com>
> Signed-off-by: Lior Nahmanson <liorna@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
>  drivers/infiniband/hw/mlx5/qp.c | 157 ++++++++++++++++++++++++++++++++
>  1 file changed, 157 insertions(+)
> 
> diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
> index 7a5f1eba60e3..65a380543f5a 100644
> +++ b/drivers/infiniband/hw/mlx5/qp.c
> @@ -1974,6 +1974,160 @@ static int create_xrc_tgt_qp(struct mlx5_ib_dev *dev, struct mlx5_ib_qp *qp,
>  	return 0;
>  }
>  
> +static int create_dci(struct mlx5_ib_dev *dev, struct ib_pd *pd,
> +		      struct mlx5_ib_qp *qp,
> +		      struct mlx5_create_qp_params *params)
> +{

This is a huge amount of copying just to add 4 lines, why?

There must be a better way to do this qp stuff.

Why not put more stuff in _create_user_qp()?

Jason