netdev - Re: [PATCH v10 02/26] sfc: add basic cxl initialization

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Message-ID: <20250207130342.GS554665@kernel.org>
Date: Fri, 7 Feb 2025 13:03:42 +0000
From: Simon Horman <horms@...nel.org>
To: alucerop@....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
Subject: Re: [PATCH v10 02/26] sfc: add basic cxl initialization

On Wed, Feb 05, 2025 at 03:19:26PM +0000, alucerop@....com wrote:
> From: Alejandro Lucero <alucerop@....com>
> 
> Create a cxl_memdev_state with CXL_DEVTYPE_DEVMEM, aka CXL Type2 memory
> device.
> 
> Make sfc CXL initialization dependent on kernel CXL configuration.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> ---
>  drivers/net/ethernet/sfc/Kconfig      |  5 +++
>  drivers/net/ethernet/sfc/Makefile     |  1 +
>  drivers/net/ethernet/sfc/efx.c        | 16 ++++++-
>  drivers/net/ethernet/sfc/efx_cxl.c    | 60 +++++++++++++++++++++++++++
>  drivers/net/ethernet/sfc/efx_cxl.h    | 40 ++++++++++++++++++
>  drivers/net/ethernet/sfc/net_driver.h | 10 +++++
>  6 files changed, 131 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/net/ethernet/sfc/efx_cxl.c
>  create mode 100644 drivers/net/ethernet/sfc/efx_cxl.h
> 
> diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig
> index 3eb55dcfa8a6..0ce4a9cd5590 100644
> --- a/drivers/net/ethernet/sfc/Kconfig
> +++ b/drivers/net/ethernet/sfc/Kconfig
> @@ -65,6 +65,11 @@ config SFC_MCDI_LOGGING
>  	  Driver-Interface) commands and responses, allowing debugging of
>  	  driver/firmware interaction.  The tracing is actually enabled by
>  	  a sysfs file 'mcdi_logging' under the PCI device.
> +config SFC_CXL
> +	bool "Solarflare SFC9100-family CXL support"
> +	depends on SFC && CXL_BUS && !(SFC=y && CXL_BUS=m)
> +	depends on CXL_BUS >= CXL_BUS

Hi Alejandro,

I'm confused by the intent of the line above.
Could you clarify?

> +	default SFC
>  
>  source "drivers/net/ethernet/sfc/falcon/Kconfig"
>  source "drivers/net/ethernet/sfc/siena/Kconfig"

...