netdev - [RFC PATCH net-next 07/12] Documentation: networking: dsa: mention integration with devlink

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Date:   Sun, 21 Feb 2021 23:33:50 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        DENG Qingfang <dqfext@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        George McCollister <george.mccollister@...il.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Kurt Kanzenbach <kurt@...utronix.de>
Subject: [RFC PATCH net-next 07/12] Documentation: networking: dsa: mention integration with devlink

From: Vladimir Oltean <vladimir.oltean@....com>

Add a short summary of the devlink features supported by the DSA core.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 Documentation/networking/dsa/dsa.rst | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/Documentation/networking/dsa/dsa.rst b/Documentation/networking/dsa/dsa.rst
index 3c6560a43ae0..463b48714fe9 100644
--- a/Documentation/networking/dsa/dsa.rst
+++ b/Documentation/networking/dsa/dsa.rst
@@ -394,6 +394,7 @@ DSA currently leverages the following subsystems:
 - MDIO/PHY library: ``drivers/net/phy/phy.c``, ``mdio_bus.c``
 - Switchdev:``net/switchdev/*``
 - Device Tree for various of_* functions
+- Devlink: ``net/core/devlink.c``
 
 MDIO/PHY library
 ----------------
@@ -433,6 +434,32 @@ more specifically with its VLAN filtering portion when configuring VLANs on top
 of per-port slave network devices. As of today, the only SWITCHDEV objects
 supported by DSA are the FDB and VLAN objects.
 
+Devlink
+-------
+
+DSA registers one devlink device per each physical switch in the fabric.
+For each devlink device, every physical port (i.e. user ports, CPU ports, DSA
+links and unused ports) is exposed as a devlink port.
+
+DSA drivers can make use of the following devlink features:
+- Regions: debugging feature which allows user space to dump driver-defined
+  areas of hardware information in a low-level, binary format. Both global
+  regions as well as per-port regions are supported. Since address tables and
+  VLAN tables are only inspectable by core iproute2 tools (ip-link, bridge) on
+  user ports, devlink regions can be created for dumping these tables on the
+  non-user ports too.
+- Params: a feature which enables user to configure certain low-level tunable
+  knobs pertaining to the device. Drivers may implement applicable generic
+  devlink params, or may add new device-specific devlink params.
+- Resources: a monitoring feature which enables users to see the degree of
+  utilization of certain hardware tables in the device, such as FDB, VLAN, etc.
+- Shared buffers: a QoS feature for adjusting and partitioning memory and frame
+  reservations per port and per traffic class, in the ingress and egress
+  directions, such that low-priority bulk traffic does not impede the
+  processing of high-priority critical traffic.
+
+For more details, consult ``Documentation/networking/devlink/``.
+
 Device Tree
 -----------
 
-- 
2.25.1