linux-kernel - [RFC PATCH net-next 0/5] ATU and FDB synchronization on locked ports

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Message-Id: <20230117185714.3058453-1-netdev@kapio-technology.com>
Date:   Tue, 17 Jan 2023 19:57:09 +0100
From:   "Hans J. Schultz" <netdev@...io-technology.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org,
        "Hans J. Schultz" <netdev@...io-technology.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com (maintainer:MICROCHIP KSZ SERIES ETHERNET
        SWITCH DRIVER), Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Russell King <linux@...linux.org.uk>,
        Christian Marangi <ansuelsmth@...il.com>,
        linux-kernel@...r.kernel.org (open list),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support),
        linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support),
        linux-renesas-soc@...r.kernel.org (open list:RENESAS RZ/N1 A5PSW SWITCH
        DRIVER),
        bridge@...ts.linux-foundation.org (moderated list:ETHERNET BRIDGE)
Subject: [RFC PATCH net-next 0/5] ATU and FDB synchronization on locked ports

This patch set makes it possible to have synchronized dynamic ATU and FDB
entries on locked ports. As locked ports are not able to automatically
learn, they depend on userspace added entries, where userspace can add
static or dynamic entries. The lifetime of static entries are completely
dependent on userspace intervention, and thus not of interest here. We
are only concerned with dynamic entries, which can be added with a
command like:

bridge fdb replace ADDR dev <DEV> master dynamic

We choose only to support this feature on locked ports, as it involves
utilizing the CPU to handle ATU related switchcore events (typically
interrupts) and thus can result in significant performance loss if
exposed to heavy traffic.

On locked ports it is important for userspace to know when an authorized
station has become silent, hence not breaking the communication of a
station that has been authorized based on the MAC-Authentication Bypass
(MAB) scheme. Thus if the station keeps being active after authorization,
it will continue to have an open port as long as it is active. Only after
a silent period will it have to be reauthorized. As the ageing process in
the ATU is dependent on incoming traffic to the switchcore port, it is
necessary for the ATU to signal that an entry has aged out, so that the
FDB can be updated at the correct time.

This patch set includes a solution for the Marvell mv88e6xxx driver, where
for this driver we use the Hold-At-One feature so that an age-out
violation interrupt occurs when a station has been silent for the
system-set age time. The age out violation interrupt allows the switchcore
driver to remove both the ATU and the FDB entry at the same time.

It is up to the maintainers of other switchcore drivers to implement the
feature for their specific driver.

Hans J. Schultz (5):
  net: bridge: add dynamic flag to switchdev notifier
  net: dsa: propagate flags down towards drivers
  drivers: net: dsa: add fdb entry flags incoming to switchcore drivers
  net: bridge: ensure FDB offloaded flag is handled as needed
  net: dsa: mv88e6xxx: implementation of dynamic ATU entries

 drivers/net/dsa/b53/b53_common.c        | 12 ++++-
 drivers/net/dsa/b53/b53_priv.h          |  4 +-
 drivers/net/dsa/hirschmann/hellcreek.c  | 12 ++++-
 drivers/net/dsa/lan9303-core.c          | 12 ++++-
 drivers/net/dsa/lantiq_gswip.c          | 12 ++++-
 drivers/net/dsa/microchip/ksz9477.c     |  8 ++--
 drivers/net/dsa/microchip/ksz9477.h     |  8 ++--
 drivers/net/dsa/microchip/ksz_common.c  | 14 ++++--
 drivers/net/dsa/mt7530.c                | 12 ++++-
 drivers/net/dsa/mv88e6xxx/chip.c        | 24 ++++++++--
 drivers/net/dsa/mv88e6xxx/global1_atu.c | 21 +++++++++
 drivers/net/dsa/mv88e6xxx/port.c        |  6 ++-
 drivers/net/dsa/mv88e6xxx/switchdev.c   | 61 +++++++++++++++++++++++++
 drivers/net/dsa/mv88e6xxx/switchdev.h   |  5 ++
 drivers/net/dsa/mv88e6xxx/trace.h       |  5 ++
 drivers/net/dsa/ocelot/felix.c          | 12 ++++-
 drivers/net/dsa/qca/qca8k-common.c      | 12 ++++-
 drivers/net/dsa/qca/qca8k.h             |  4 +-
 drivers/net/dsa/rzn1_a5psw.c            | 12 ++++-
 drivers/net/dsa/sja1105/sja1105_main.c  | 19 ++++++--
 include/net/dsa.h                       |  6 ++-
 include/net/switchdev.h                 |  1 +
 net/bridge/br_fdb.c                     |  5 +-
 net/bridge/br_switchdev.c               |  1 +
 net/dsa/port.c                          | 28 +++++++-----
 net/dsa/port.h                          |  8 ++--
 net/dsa/slave.c                         | 17 +++++--
 net/dsa/switch.c                        | 30 ++++++++----
 net/dsa/switch.h                        |  1 +
 29 files changed, 298 insertions(+), 74 deletions(-)

-- 
2.34.1