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Message-ID: <20201130164119.571362-1-parav@nvidia.com>
Date: Mon, 30 Nov 2020 18:41:19 +0200
From: Parav Pandit <parav@...dia.com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>
CC: Parav Pandit <parav@...dia.com>, Jiri Pirko <jiri@...dia.com>
Subject: [PATCH net-next] devlink: Add devlink port documentation
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>
---
.../networking/devlink/devlink-port.rst | 102 ++++++++++++++++++
Documentation/networking/devlink/index.rst | 1 +
2 files changed, 103 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..966d2ee328a6
--- /dev/null
+++ b/Documentation/networking/devlink/devlink-port.rst
@@ -0,0 +1,102 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============
+Devlink Port
+============
+
+``devlink-port`` provides capability for a driver to expose various
+flavours of ports which exist on device. A devlink port can of an
+embedded switch (eswitch) present on the device.
+
+A devlink port can be of 3 diffferent types.
+
+.. list-table:: List of devlink port types
+ :widths: 23 90
+
+ * - Type
+ - Description
+ * - ``DEVLINK_PORT_TYPE_ETH``
+ - This type is set for a devlink port when a physical link layer of the port
+ is Ethernet.
+ * - ``DEVLINK_PORT_TYPE_IB``
+ - This type is set for a devlink port when a physical 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.
+
+Devlink port can be of few different flavours described below.
+
+.. list-table:: List of devlink port flavours
+ :widths: 33 90
+
+ * - Flavour
+ - Description
+ * - ``DEVLINK_PORT_FLAVOUR_PHYSICAL``
+ - Any kind of port which is physically facing the user. This can be
+ a eswitch physical port or any other physical port on the device.
+ * - ``DEVLINK_PORT_FLAVOUR_CPU``
+ - This indicates a CPU port.
+ * - ``DEVLINK_PORT_FLAVOUR_DSA``
+ - This indicates a interconnect port in a distributed switch architecture.
+ * - ``DEVLINK_PORT_FLAVOUR_PCI_PF``
+ - This indicates an eswitch port representing PCI physical function(PF).
+ * - ``DEVLINK_PORT_FLAVOUR_PCI_VF``
+ - This indicates an eswitch port representing PCI virtual function(VF).
+ * - ``DEVLINK_PORT_FLAVOUR_VIRTUAL``
+ - This indicates a virtual port facing the user.
+ * - ``DEVLINK_PORT_FLAVOUR_VIRTUAL``
+ - This indicates an virtual port facing the user.
+
+A devlink port may be for a controller consist of one or more PCI device(s).
+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.
+
+An example view of two controller systems::
+
+ ---------------------------------------------------------
+ | |
+ | --------- --------- ------- ------- |
+ ----------- | | 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 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.
diff --git a/Documentation/networking/devlink/index.rst b/Documentation/networking/devlink/index.rst
index d82874760ae2..aab79667f97b 100644
--- a/Documentation/networking/devlink/index.rst
+++ b/Documentation/networking/devlink/index.rst
@@ -18,6 +18,7 @@ general.
devlink-info
devlink-flash
devlink-params
+ devlink-port
devlink-region
devlink-resource
devlink-reload
--
2.26.2
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