netdev - Re: [PATCH mlx5-next 12/12] net/mlx5: Set ODP SRQ support in firmware

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Message-ID: <20190131232843.GA15062@ziepe.ca>
Date:   Thu, 31 Jan 2019 16:28:44 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Majd Dibbiny <majd@...lanox.com>,
        Moni Shoua <monis@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH mlx5-next 12/12] net/mlx5: Set ODP SRQ support in firmware

On Tue, Jan 22, 2019 at 08:48:51AM +0200, Leon Romanovsky wrote:
> From: Moni Shoua <monis@...lanox.com>
> 
> To avoid compatibility issue with older kernels the firmware doesn't
> allow SRQ to work with ODP unless kernel asks for it.
> 
> Signed-off-by: Moni Shoua <monis@...lanox.com>
> Reviewed-by: Majd Dibbiny <majd@...lanox.com>
> Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
>  .../net/ethernet/mellanox/mlx5/core/main.c    | 53 +++++++++++++++++++
>  include/linux/mlx5/device.h                   |  3 ++
>  include/linux/mlx5/mlx5_ifc.h                 |  1 +
>  3 files changed, 57 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> index be81b319b0dc..b3a76df0cf6c 100644
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> @@ -459,6 +459,53 @@ static int handle_hca_cap_atomic(struct mlx5_core_dev *dev)
>  	return err;
>  }
>  
> +static int handle_hca_cap_odp(struct mlx5_core_dev *dev)
> +{
> +	void *set_ctx;
> +	void *set_hca_cap;
> +	int set_sz = MLX5_ST_SZ_BYTES(set_hca_cap_in);
> +	int err;
> +
> +	if (!MLX5_CAP_GEN(dev, pg))
> +		return 0;

Should a  

    if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING))
             return 0;

Be here?

Jason