linux-kernel - Re: [PATCH rdma-next 2/2] IB/mlx5: Enable UAR to have DevX UID

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Date:   Wed, 15 Sep 2021 10:47:53 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Meir Lichtinger <meirl@...dia.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Yishai Hadas <yishaih@...dia.com>
Subject: Re: [PATCH rdma-next 2/2] IB/mlx5: Enable UAR to have DevX UID

On Wed, Sep 15, 2021 at 02:11:23AM +0300, Leon Romanovsky wrote:
> From: Meir Lichtinger <meirl@...dia.com>
> 
> UID field was added to alloc_uar and dealloc_uar PRM command, to specify
> DevX UID for UAR. This change enables firmware validating user access to
> its own UAR resources.
> 
> For the kernel allocated UARs the UID will stay 0 as of today.
> 
> Signed-off-by: Meir Lichtinger <meirl@...dia.com>
> Reviewed-by: Yishai Hadas <yishaih@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
>  drivers/infiniband/hw/mlx5/cmd.c  | 24 ++++++++++++++
>  drivers/infiniband/hw/mlx5/cmd.h  |  2 ++
>  drivers/infiniband/hw/mlx5/main.c | 55 +++++++++++++++++--------------
>  3 files changed, 57 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mlx5/cmd.c b/drivers/infiniband/hw/mlx5/cmd.c
> index a8db8a051170..0fe3c4ceec43 100644
> +++ b/drivers/infiniband/hw/mlx5/cmd.c
> @@ -206,3 +206,27 @@ int mlx5_cmd_mad_ifc(struct mlx5_core_dev *dev, const void *inb, void *outb,
>  	kfree(in);
>  	return err;
>  }
> +
> +int mlx5_ib_cmd_uar_alloc(struct mlx5_core_dev *dev, u32 *uarn, u16 uid)
> +{
> +	u32 out[MLX5_ST_SZ_DW(alloc_uar_out)] = {};
> +	u32 in[MLX5_ST_SZ_DW(alloc_uar_in)] = {};
> +	int err;
> +
> +	MLX5_SET(alloc_uar_in, in, opcode, MLX5_CMD_OP_ALLOC_UAR);
> +	MLX5_SET(alloc_uar_in, in, uid, uid);
> +	err = mlx5_cmd_exec_inout(dev, alloc_uar, in, out);
> +	if (!err)
> +		*uarn = MLX5_GET(alloc_uar_out, out, uar);

Success oriented flow:

 if (err)
     return err;
 *uarn = MLX5_GET(alloc_uar_out, out, uar);
 return 0;

And why did we add entirely new functions instead of just adding a uid
argument to the core ones? Or, why doesn't this delete the old core
functions that look unused outside of IB anyhow?

Jason