netdev - Re: [PATCH v12 02/23] sfc: add cxl support

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Message-ID: <20250331183114.GE185681@horms.kernel.org>
Date: Mon, 31 Mar 2025 19:31:14 +0100
From: Simon Horman <horms@...nel.org>
To: alejandro.lucero-palau@....com
Cc: linux-cxl@...r.kernel.org, netdev@...r.kernel.org,
	dan.j.williams@...el.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 v12 02/23] sfc: add cxl support

On Mon, Mar 31, 2025 at 03:45:34PM +0100, alejandro.lucero-palau@....com wrote:
> From: Alejandro Lucero <alucerop@....com>
> 
> Add CXL initialization based on new CXL API for accel drivers and make
> it dependent on kernel CXL configuration.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>

...

> diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c

...

> @@ -1214,6 +1218,15 @@ static int efx_pci_probe(struct pci_dev *pci_dev,
>  	if (rc)
>  		goto fail2;
>  
> +	/* A successful cxl initialization implies a CXL region created to be
> +	 * used for PIO buffers. If there is no CXL support, or initialization
> +	 * fails, efx_cxl_pio_initialised wll be false and legacy PIO buffers

nit: will

> +	 * defined at specific PCI BAR regions will be used.
> +	 */
> +	rc = efx_cxl_init(probe_data);
> +	if (rc)
> +		pci_err(pci_dev, "CXL initialization failed with error %d\n", rc);
> +
>  	rc = efx_pci_probe_post_io(efx);
>  	if (rc) {
>  		/* On failure, retry once immediately.

...