netdev - [PATCH net-next 0/3] Basic QoS classification on Felix DSA switch using dcbnl

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Date:   Fri, 11 Mar 2022 23:15:17 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com, Petr Machata <petrm@...dia.com>
Subject: [PATCH net-next 0/3] Basic QoS classification on Felix DSA switch using dcbnl

Basic QoS classification for Ocelot switches means port-based default
priority, DSCP-based and VLAN PCP based. This is opposed to advanced QoS
classification which is done through the VCAP IS1 TCAM based engine.

The patch set is a logical continuation of this RFC which attempted to
describe the default-prio as a matchall entry placed at the end of a
series of offloaded tc filters:
https://patchwork.kernel.org/project/netdevbpf/cover/20210113154139.1803705-1-olteanv@gmail.com/

I have tried my best to satisfy the feedback that we should cater for
pre-configured QoS profiles. Ironically, the only pre-configured QoS
profile that the Felix switch driver has is for VLAN PCP (1:1 mapping
with QoS class), yet IEEE 802.1Q or dcbnl offer no mechanism for
reporting or changing that.

Testing was done with the iproute2 dcb app. The qos_class of packets was
dumped from net/dsa/tag_ocelot.c.

(1) $ dcb app show dev swp3
default-prio 0
(2) $ dcb app replace dev swp3 default-prio 3
(3) $ dcb app replace dev swp3 dscp-prio CS3:5
(4) $ dcb app replace dev swp3 dscp-prio CS2:2
(5) $ dcb app show dev swp3
default-prio 3
dscp-prio CS2:2 CS3:5

Traffic sent with "ping -Q 64 <ipaddr>", which means CS2.
These packets match qos_class 0 after command (1),
qos_class 3 after command (2),
qos_class 3 after command (3), and
qos_class 2 after command (2).

Vladimir Oltean (3):
  net: dsa: report and change port default priority using dcbnl
  net: dsa: report and change port dscp priority using dcbnl
  net: dsa: felix: configure default-prio and dscp priorities

 drivers/net/dsa/ocelot/felix.c     |  43 ++++++
 drivers/net/ethernet/mscc/ocelot.c | 116 +++++++++++++++
 include/net/dsa.h                  |  12 ++
 include/soc/mscc/ocelot.h          |   5 +
 net/dsa/slave.c                    | 223 +++++++++++++++++++++++++++++
 5 files changed, 399 insertions(+)

-- 
2.25.1