linux-kernel - Re: [PATCH v3 1/2] Documentation: fpga: dfl: add PCI Identification documentation

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Message-ID: <1aec7d55-24d5-e9bc-9052-728335ec7d9d@redhat.com>
Date:   Tue, 12 Jul 2022 19:14:32 +0200
From:   Marco Pagani <marpagan@...hat.com>
To:     matthew.gerlach@...ux.intel.com
Cc:     basheer.ahmed.muddebihal@...el.com, corbet@....net,
        hao.wu@...el.com, linux-doc@...r.kernel.org,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        mdf@...nel.org, russell.h.weight@...el.com,
        tianfei.zhang@...el.com, trix@...hat.com, yilun.xu@...el.com
Subject: Re: [PATCH v3 1/2] Documentation: fpga: dfl: add PCI Identification
 documentation

On 2022-07-07 17:05, matthew.gerlach@...ux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> 
> Add documentation on identifying FPGA based PCI cards prompted
> by discussion on the linux-fpga@...r.kernel.org mailing list.
> 
> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> ---
> v3: Add url to page tracking PCI ID information for DFL based cards.
> 
> v2: Introduced in v2.
> ---
>  Documentation/fpga/dfl.rst | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
> index 15b670926084..5144775b860a 100644
> --- a/Documentation/fpga/dfl.rst
> +++ b/Documentation/fpga/dfl.rst
> @@ -507,6 +507,27 @@ ids application.
>  https://github.com/OPAE/dfl-feature-id
>  
>  
> +PCI Device Identification
> +================================
> +Since FPGA based PCI cards can be reconfigured to a perform a completely

There's a small typo: "to a perform" --> "to perform"

> +new function at runtime, properly identifying such cards and binding the
> +correct driver can be challenging. In many use cases, deployed FPGA based
> +PCI cards are essentially static and the PCI Product ID and Vendor ID pair
> +is sufficient to identify the card.  The DFL framework helps with the
> +dynamic case of deployed FPGA cards changing at run time by providing
> +more detailed information about card discoverable at runtime.
> +
> +At one level, the DFL on a PCI card describes the function of the card.
> +However, the same DFL could be instantiated on different physical cards.
> +Conversely, different DFLs could be instantiated on the same physical card.
> +Practical management of a cloud containing a heterogeneous set of such cards
> +requires a PCI level of card identification. While the PCI Product ID and
> +Vendor ID may be sufficient to bind the dfl-pci driver, it is expected
> +that FPGA PCI cards would advertise suitable Subsystem ID and Subsystem
> +Vendor ID values. Further PCI Product, Vendor, and Subsystem id tracking
> +can be found at https://github.com/OPAE/dfl-feature-id/blob/main/dfl-pci-ids.rst.
> +
> +
>  Location of DFLs on a PCI Device
>  ================================
>  The original method for finding a DFL on a PCI device assumed the start of the

Marco