Re: [PATCH] cxl/mbox: Add the CXL 4.0 command return codes 001Fh and 0020h

[Richard Cheng <icheng@nvidia.com>]

On Thu, Oct 15, 2026 at 01:50:48PM +0800, Gaobin Huang wrote:
> CMD_CMD_RC_TABLE ends at 001Eh (Invalid Extent List), but the command
> return code table in CXL r4.0 Table 8-208 also defines:
> 
>   001Fh  Transfer Out of Order: The input parameters data transfer was
>          aborted because it occurred out of order.
>   0020h  Request Abort Not Supported by Background Operation: The ongoing
>          background operation does not support the Request Abort command.
> 
> A device that reports either code is described as an unknown return code.
> Add both entries, mapped to -ENXIO.
> 
> Signed-off-by: Gaobin Huang <huanggaobin23@semi.ac.cn>
> ---
>  drivers/cxl/cxlmem.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
> index c401e3a1a..43f29564c 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
> @@ -190,6 +190,8 @@ static inline struct cxl_ep *cxl_ep_load(struct cxl_port *port,
>  	C(FEATURETRANSFEROOO, -ENXIO, "feature transfer out of order"),		\
>  	C(RESOURCEEXHAUSTED, -ENXIO, "resources are exhausted"),		\
>  	C(EXTLIST, -ENXIO, "invalid Extent List"),				\
> +	C(TRANSFEROOO, -ENXIO, "transfer out of order"),			\
> +	C(REQABORTNOTSUP, -ENXIO, "request abort not supported"),		\

Hi Gaobin,

Do we have users for them ? or potential users ?

Best regards,
Richard Cheng.

>  
>  #undef C
>  #define C(a, b, c) CXL_MBOX_CMD_RC_##a
> 
> base-commit: 999811aca000b0d3d1c838c60dc9db7c72eb0c73
> -- 
> 2.34.1
>