netdev - Re: [PATCH v6 23/28] sfc: create cxl region

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Message-ID: <20241203143749.GH778635@gmail.com>
Date: Tue, 3 Dec 2024 14:37:49 +0000
From: Martin Habets <habetsm.xilinx@...il.com>
To: alejandro.lucero-palau@....com
Cc: linux-cxl@...r.kernel.org, netdev@...r.kernel.org,
	dan.j.williams@...el.com, martin.habets@...inx.com,
	edward.cree@....com, davem@...emloft.net, kuba@...nel.org,
	pabeni@...hat.com, edumazet@...gle.com, dave.jiang@...el.com,
	Alejandro Lucero <alucerop@....com>
Subject: Re: [PATCH v6 23/28] sfc: create cxl region

On Mon, Dec 02, 2024 at 05:12:17PM +0000, alejandro.lucero-palau@....com wrote:
> 
> From: Alejandro Lucero <alucerop@....com>
> 
> Use cxl api for creating a region using the endpoint decoder related to
> a DPA range.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>

Reviewed-by: Martin Habets <habetsm.xilinx@...il.com>
One comment below.

> ---
>  drivers/net/ethernet/sfc/efx_cxl.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
> index 6ca23874d0c7..3e44c31daf36 100644
> --- a/drivers/net/ethernet/sfc/efx_cxl.c
> +++ b/drivers/net/ethernet/sfc/efx_cxl.c
> @@ -128,10 +128,19 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
>  		goto err3;
>  	}
>  
> +	cxl->efx_region = cxl_create_region(cxl->cxlrd, cxl->cxled);
> +	if (!cxl->efx_region) {
> +		pci_err(pci_dev, "CXL accel create region failed");

This error would be more meaningful if it printed out the region address and size.

> +		rc = PTR_ERR(cxl->efx_region);
> +		goto err_region;
> +	}
> +
>  	probe_data->cxl = cxl;
>  
>  	return 0;
>  
> +err_region:
> +	cxl_dpa_free(cxl->cxled);
>  err3:
>  	cxl_release_resource(cxl->cxlds, CXL_RES_RAM);
>  err2:
> @@ -144,6 +153,7 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
>  void efx_cxl_exit(struct efx_probe_data *probe_data)
>  {
>  	if (probe_data->cxl) {
> +		cxl_accel_region_detach(probe_data->cxl->cxled);
>  		cxl_dpa_free(probe_data->cxl->cxled);
>  		cxl_release_resource(probe_data->cxl->cxlds, CXL_RES_RAM);
>  		kfree(probe_data->cxl->cxlds);
> -- 
> 2.17.1
> 
>