netdev - Re: [PATCH v5 02/27] sfc: add cxl support using new CXL API

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Message-ID: <Z0YOju3FaSSCJRRr@smc-140338-bm01>
Date: Tue, 26 Nov 2024 18:08:14 +0000
From: Fan Ni <nifan.cxl@...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,
	Alejandro Lucero <alucerop@....com>
Subject: Re: [PATCH v5 02/27] sfc: add cxl support using new CXL API

On Mon, Nov 18, 2024 at 04:44:09PM +0000, alejandro.lucero-palau@....com wrote:
> From: Alejandro Lucero <alucerop@....com>
> 
> Add CXL initialization based on new CXL API for accel drivers and make
> it dependable on kernel CXL configuration.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> ---
>  drivers/net/ethernet/sfc/Kconfig      |  7 +++
>  drivers/net/ethernet/sfc/Makefile     |  1 +
>  drivers/net/ethernet/sfc/efx.c        | 24 +++++++-
>  drivers/net/ethernet/sfc/efx_cxl.c    | 88 +++++++++++++++++++++++++++
>  drivers/net/ethernet/sfc/efx_cxl.h    | 28 +++++++++
>  drivers/net/ethernet/sfc/net_driver.h | 10 +++
>  6 files changed, 157 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/net/ethernet/sfc/efx_cxl.c
>  create mode 100644 drivers/net/ethernet/sfc/efx_cxl.h
...
> +	res = DEFINE_RES_MEM_NAMED(0, EFX_CTPIO_BUFFER_SIZE, "ram");
> +	if (cxl_set_resource(cxl->cxlds, res, CXL_RES_RAM)) {
> +		pci_err(pci_dev, "cxl_set_resource RAM failed\n");
> +		rc = -EINVAL;
> +		goto err2;
> +	}
> +
> +	probe_data->cxl = cxl;
> +
> +	return 0;
> +
> +err2:
> +	kfree(cxl->cxlds);
> +err1:
> +	kfree(cxl);
> +	return rc;
> +
Unwanted blank line here.

Fan
> +}
> +
> +void efx_cxl_exit(struct efx_probe_data *probe_data)
> +{
> +	if (probe_data->cxl) {
> +		kfree(probe_data->cxl->cxlds);
> +		kfree(probe_data->cxl);
> +	}
> +}
> +
> +MODULE_IMPORT_NS(CXL);
> diff --git a/drivers/net/ethernet/sfc/efx_cxl.h b/drivers/net/ethernet/sfc/efx_cxl.h
> new file mode 100644
> index 000000000000..90fa46bc94db
> --- /dev/null
> +++ b/drivers/net/ethernet/sfc/efx_cxl.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/****************************************************************************
> + * Driver for AMD network controllers and boards
> + * Copyright (C) 2024, Advanced Micro Devices, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published
> + * by the Free Software Foundation, incorporated herein by reference.
> + */
> +
> +#ifndef EFX_CXL_H
> +#define EFX_CXL_H
> +
> +struct efx_nic;
> +
> +struct efx_cxl {
> +	struct cxl_dev_state *cxlds;
> +	struct cxl_memdev *cxlmd;
> +	struct cxl_root_decoder *cxlrd;
> +	struct cxl_port *endpoint;
> +	struct cxl_endpoint_decoder *cxled;
> +	struct cxl_region *efx_region;
> +	void __iomem *ctpio_cxl;
> +};
> +
> +int efx_cxl_init(struct efx_probe_data *probe_data);
> +void efx_cxl_exit(struct efx_probe_data *probe_data);
> +#endif
> diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
> index b85c51cbe7f9..efc6d90380b9 100644
> --- a/drivers/net/ethernet/sfc/net_driver.h
> +++ b/drivers/net/ethernet/sfc/net_driver.h
> @@ -1160,14 +1160,24 @@ struct efx_nic {
>  	atomic_t n_rx_noskb_drops;
>  };
>  
> +#ifdef CONFIG_SFC_CXL
> +struct efx_cxl;
> +#endif
> +
>  /**
>   * struct efx_probe_data - State after hardware probe
>   * @pci_dev: The PCI device
>   * @efx: Efx NIC details
> + * @cxl: details of related cxl objects
> + * @cxl_pio_initialised: cxl initialization outcome.
>   */
>  struct efx_probe_data {
>  	struct pci_dev *pci_dev;
>  	struct efx_nic efx;
> +#ifdef CONFIG_SFC_CXL
> +	struct efx_cxl *cxl;
> +	bool cxl_pio_initialised;
> +#endif
>  };
>  
>  static inline struct efx_nic *efx_netdev_priv(struct net_device *dev)
> -- 
> 2.17.1
> 

-- 
Fan Ni (From gmail)