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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2021-03-16 14:24:14 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-03-17 01:13:44 +0300 |
| commit | 8411abbcad8e73a3b3a27ff6c0d755c6036f4c77 (patch) | |
| tree | 1d1045f7af02e67f2575f682dce9db1f82288437 /Documentation/networking | |
| parent | 5a275f4c2989f6f1fab626c61d34001f28381a18 (diff) | |
| download | linux-8411abbcad8e73a3b3a27ff6c0d755c6036f4c77.tar.xz | |
Documentation: networking: dsa: mention integration with devlink
Add a short summary of the devlink features supported by the DSA core.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/dsa/dsa.rst | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/Documentation/networking/dsa/dsa.rst b/Documentation/networking/dsa/dsa.rst index 9c287dfd3c45..af604fe976b3 100644 --- a/Documentation/networking/dsa/dsa.rst +++ b/Documentation/networking/dsa/dsa.rst @@ -416,6 +416,7 @@ 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 ---------------- @@ -455,6 +456,36 @@ 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 physical switch in the fabric. +For each devlink device, every physical port (i.e. user ports, CPU ports, DSA +links or 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. It is possible to export + devlink regions even for pieces of data that are already exposed in some way + to the standard iproute2 user space programs (ip-link, bridge), like address + tables and VLAN tables. For example, this might be useful if the tables + contain additional hardware-specific details which are not visible through + the iproute2 abstraction, or it might be useful to inspect these tables on + the non-user ports too, which are invisible to iproute2 because no network + interface is registered for them. +- 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 ----------- |