netdev - Re: [PATCH v18 18/20] sfc: create cxl region

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Message-ID: <20250918160325.00005261@huawei.com>
Date: Thu, 18 Sep 2025 16:03:25 +0100
From: Jonathan Cameron <jonathan.cameron@...wei.com>
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 v18 18/20] sfc: create cxl region

On Thu, 18 Sep 2025 10:17:44 +0100
<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.
> 
> Add a callback for unwinding sfc cxl initialization when the endpoint port
> is destroyed by potential cxl_acpi or cxl_mem modules removal.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> ---
>  drivers/cxl/core/core.h            |  5 -----
>  drivers/net/ethernet/sfc/efx_cxl.c | 22 ++++++++++++++++++++++
>  include/cxl/cxl.h                  |  8 ++++++++
>  3 files changed, 30 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
> index c4dddbec5d6e..83abaca9f418 100644
> --- a/drivers/cxl/core/core.h
> +++ b/drivers/cxl/core/core.h
> @@ -14,11 +14,6 @@ extern const struct device_type cxl_pmu_type;
>  
>  extern struct attribute_group cxl_base_attribute_group;
>  
> -enum cxl_detach_mode {
> -	DETACH_ONLY,
> -	DETACH_INVALIDATE,
> -};
Seems like a stray move that should have been in the earlier patch.

> -
>  #ifdef CONFIG_CXL_REGION
>  extern struct device_attribute dev_attr_create_pmem_region;
>  extern struct device_attribute dev_attr_create_ram_region;
> diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
> index 4461b7a4dc2c..85490afc7930 100644
> --- a/drivers/net/ethernet/sfc/efx_cxl.c
> +++ b/drivers/net/ethernet/sfc/efx_cxl.c

> diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
> index dbacefff8d60..e82f94921b5b 100644
> --- a/include/cxl/cxl.h
> +++ b/include/cxl/cxl.h
> @@ -282,4 +282,12 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
>  				     struct cxl_endpoint_decoder **cxled,
>  				     int ways, void (*action)(void *),
>  				     void *data);
> +enum cxl_detach_mode {
> +	DETACH_ONLY,
> +	DETACH_INVALIDATE,
> +};
> +
> +int cxl_decoder_detach(struct cxl_region *cxlr,
> +		       struct cxl_endpoint_decoder *cxled, int pos,
> +		       enum cxl_detach_mode mode);
Is this change in the right patch?  It's not a code move here
as there isn't a declaration of this being removed.
I'd rather expect this in patch 16, along with removal of the declaration currently
in core/core.h

>  #endif /* __CXL_CXL_H__ */