linux-kernel - Re: [PATCH 07/14] cxl/mem: Add send command

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Message-ID: <20210201181535.GI197521@fedora>
Date:   Mon, 1 Feb 2021 13:15:35 -0500
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Ben Widawsky <ben.widawsky@...el.com>
Cc:     linux-cxl@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Chris Browy <cbrowy@...ry-design.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Jon Masters <jcm@...masters.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        daniel.lll@...baba-inc.com,
        "John Groves (jgroves)" <jgroves@...ron.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>
Subject: Re: [PATCH 07/14] cxl/mem: Add send command

> +/**
> + * struct cxl_send_command - Send a command to a memory device.
> + * @id: The command to send to the memory device. This must be one of the
> + *	commands returned by the query command.
> + * @flags: Flags for the command (input).
> + * @rsvd: Must be zero.
> + * @retval: Return value from the memory device (output).
> + * @size_in: Size of the payload to provide to the device (input).
> + * @size_out: Size of the payload received from the device (input/output). This
> + *	      field is filled in by userspace to let the driver know how much
> + *	      space was allocated for output. It is populated by the driver to
> + *	      let userspace know how large the output payload actually was.
> + * @in_payload: Pointer to memory for payload input (little endian order).
> + * @out_payload: Pointer to memory for payload output (little endian order).
> + *
> + * Mechanism for userspace to send a command to the hardware for processing. The
> + * driver will do basic validation on the command sizes. In some cases even the
> + * payload may be introspected. Userspace is required to allocate large
> + * enough buffers for size_out which can be variable length in certain
> + * situations.
> + */
I think (and this would help if you ran `pahole` on this structure) has
some gaps in it:

> +struct cxl_send_command {
> +	__u32 id;
> +	__u32 flags;
> +	__u32 rsvd;
> +	__u32 retval;
> +
> +	struct {
> +		__s32 size_in;

Here..Maybe just add:

__u32 rsv_2;
> +		__u64 in_payload;
> +	};
> +
> +	struct {
> +		__s32 size_out;

And here. Maybe just add:
__u32 rsv_2;
> +		__u64 out_payload;
> +	};
> +};

Perhaps to prepare for the future where this may need to be expanded, you
could add a size at the start of the structure, and
maybe what version of structure it is?

Maybe for all the new structs you are adding?