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Date:   Wed, 2 Dec 2020 18:27:26 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Parav Pandit <parav@...dia.com>, netdev@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org
Cc:     jacob.e.keller@...el.com, Jiri Pirko <jiri@...dia.com>
Subject: Re: [PATCH net-next v3] devlink: Add devlink port documentation

Hi--

On 12/2/20 5:53 AM, Parav Pandit wrote:
> Added documentation for devlink port and port function related commands.
> 
> Signed-off-by: Parav Pandit <parav@...dia.com>
> Reviewed-by: Jiri Pirko <jiri@...dia.com>
> Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
> ---
> Changelog:
> v2->v3:
>  - rephased many lines

     rephrased

>  - first paragraph now describe devlink port
>  - instead of saying PCI device/function, using PCI function every
>    where
>  - changed 'physical link layer' to 'link layer'
>  - made devlink port type description more clear
>  - made devlink port flavour description more clear
>  - moved devlink port type table after port flavour
>  - added description for the example diagram
>  - describe CPU port that its linked to DSA
>  - made devlink port description for eswitch port more clear
> v1->v2:
>  - Removed duplicate table entries for DEVLINK_PORT_FLAVOUR_VIRTUAL.
>  - replaced 'consist of' to 'consisting'
>  - changed 'can be' to 'can be of'
> ---
>  .../networking/devlink/devlink-port.rst       | 111 ++++++++++++++++++
>  Documentation/networking/devlink/index.rst    |   1 +
>  2 files changed, 112 insertions(+)
>  create mode 100644 Documentation/networking/devlink/devlink-port.rst
> 
> diff --git a/Documentation/networking/devlink/devlink-port.rst b/Documentation/networking/devlink/devlink-port.rst
> new file mode 100644
> index 000000000000..8407bbe9ce88
> --- /dev/null
> +++ b/Documentation/networking/devlink/devlink-port.rst
> @@ -0,0 +1,111 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +============
> +Devlink Port
> +============
> +
> +``devlink-port`` is a port that exist on the device. A devlink port can

                                   exists

> +be of one among many flavours. A devlink port flavour along with port
> +attributes describe what a port represents.
> +
> +A device driver who intents to publish a devlink port, sets the

                   that intends                         ^no comma

> +devlink port attributes and registers the devlink port.
> +
> +Devlink port flavours are described below.
> +
> +.. list-table:: List of devlink port flavours
> +   :widths: 33 90
> +
> +   * - Flavour
> +     - Description
> +   * - ``DEVLINK_PORT_FLAVOUR_PHYSICAL``
> +     - Any kind of physical networking port. This can be a eswitch physical

                                                            an

> +       port or any other physical port on the device.
> +   * - ``DEVLINK_PORT_FLAVOUR_DSA``
> +     - This indicates a DSA interconnect port.
> +   * - ``DEVLINK_PORT_FLAVOUR_CPU``
> +     - This indicates a CPU port applicable only to DSA.
> +   * - ``DEVLINK_PORT_FLAVOUR_PCI_PF``
> +     - This indicates an eswitch port representing a networking port of
> +       PCI physical function (PF).
> +   * - ``DEVLINK_PORT_FLAVOUR_PCI_VF``
> +     - This indicates an eswitch port representing a networking port of
> +       PCI virtual function (VF).
> +   * - ``DEVLINK_PORT_FLAVOUR_VIRTUAL``
> +     - This indicates a virtual port for the virtual PCI device such as PCI VF.
> +
> +A devlink port types are described below.

  The devlink port types

> +
> +.. list-table:: List of devlink port types
> +   :widths: 23 90
> +
> +   * - Type
> +     - Description
> +   * - ``DEVLINK_PORT_TYPE_ETH``
> +     - Driver should set this port type when a link layer of the port is Ethernet.
> +   * - ``DEVLINK_PORT_TYPE_IB``
> +     - Driver should set this port type when a link layer of the port is InfiniBand.
> +   * - ``DEVLINK_PORT_TYPE_AUTO``
> +     - This type is indicated by the user when user prefers to set the port type
> +       to be automatically detected by the device driver.
> +
> +A controller consist of one or more PCI functions. Such PCI function can have one

                consists

> +or more networking ports. A networking port of such PCI function is represented
> +by the eswitch devlink port. A devlink instance holds ports of two types of
> +controllers.
> +
> +(1) controller discovered on same system where eswitch resides:
> +This is the case where PCI PF/VF of a controller and devlink eswitch
> +instance both are located on a single system.
> +
> +(2) controller located on external host system.
> +This is the case where a controller is located in one system and its
> +devlink eswitch ports are located in a different system. Such controller
> +is called external controller.
> +
> +An example view of two controller systems::
> +
> +In this example a controller which contains the eswitch is local controller
> +with controller number = 0. The second is a external controller having
> +controller number = 1. Eswitch devlink instance has representor devlink
> +ports for the PCI functions of both the controllers.

I find that sentence confusing but I don't know how to fix it.

> +
> +                 ---------------------------------------------------------
> +                 |                                                       |
> +                 |           --------- ---------         ------- ------- |
> +    -----------  |           | vf(s) | | sf(s) |         |vf(s)| |sf(s)| |
> +    | server  |  | -------   ----/---- ---/----- ------- ---/--- ---/--- |
> +    | pci rc  |=== | pf0 |______/________/       | pf1 |___/_______/     |
> +    | connect |  | -------                       -------                 |
> +    -----------  |     | controller_num=1 (no eswitch)                   |
> +                 ------|--------------------------------------------------
> +                 (internal wire)
> +                       |
> +                 ---------------------------------------------------------
> +                 | devlink eswitch ports and reps                        |
> +                 | ----------------------------------------------------- |
> +                 | |ctrl-0 | ctrl-0 | ctrl-0 | ctrl-0 | ctrl-0 |ctrl-0 | |
> +                 | |pf0    | pf0vfN | pf0sfN | pf1    | pf1vfN |pf1sfN | |
> +                 | ----------------------------------------------------- |
> +                 | |ctrl-1 | ctrl-1 | ctrl-1 | ctrl-1 | ctrl-1 |ctrl-1 | |
> +                 | |pf0    | pf0vfN | pf0sfN | pf1    | pf1vfN |pf1sfN | |
> +                 | ----------------------------------------------------- |
> +                 |                                                       |
> +                 |                                                       |
> +                 |           --------- ---------         ------- ------- |
> +                 |           | vf(s) | | sf(s) |         |vf(s)| |sf(s)| |
> +                 | -------   ----/---- ---/----- ------- ---/--- ---/--- |
> +                 | | pf0 |______/________/       | pf1 |___/_______/     |
> +                 | -------                       -------                 |
> +                 |                                                       |
> +                 |  local controller_num=0 (eswitch)                     |
> +                 ---------------------------------------------------------
> +
> +Port function configuration
> +===========================
> +
> +When a port flavor is ``DEVLINK_PORT_FLAVOUR_PCI_PF`` or
> +``DEVLINK_PORT_FLAVOUR_PCI_VF``, it represents the networking port of a
> +PCI function. A user can configure the port function attributes before
> +enumerating the function. For example user may set the hardware address of
> +the function represented by the devlink port function.

thanks.
-- 
~Randy

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