When a switch fabric is composed of multiple switch chips, these chips
must be programmed accordingly when an event occurred on one of them.
Examples of such event include hardware bridging: when a Linux bridge
spans interconnected chips, they must be programmed to allow external
ports to ingress frames on their internal ports.
Another example is cross-chip hardware VLANs. Switch chips in-between
interconnected bridge ports must also configure a given VLAN to allow
packets to pass through them.
In order to support that, this patchset introduces a non-intrusive
notifier mechanism. It adds a notifier head in every DSA switch tree
(the said fabric), and a notifier block in every DSA switch chip.
When an even occurs, it is chained to all notifiers of the fabric.
Switch chips can react accordingly if they are cross-chip capable.
On a dynamic debug enabled system, bridging a port in a multi-chip
fabric will print something like this (ZII Rev B board):
# brctl addif br0 lan3
mv88e6085 0.1:00: crosschip DSA port 1.0 bridged to br0
mv88e6085 0.4:00: crosschip DSA port 1.0 bridged to br0
# brctl delif br0 lan3
mv88e6085 0.1:00: crosschip DSA port 1.0 unbridged from br0
mv88e6085 0.4:00: crosschip DSA port 1.0 unbridged from br0
Currently only bridging events are added. A patchset introducing support
for cross-chip hardware bridging configuration in mv88e6xxx will follow
right after. Then events for switchdev operations are next on the line.
We should note that non-switchdev events do not support rolling-back
switch-wide operations. We'll have to work on closer integration with
switchdev for that, like introducing new attributes or objects, to
benefit from the prepare and commit phases.
Vivien Didelot (6):
net: dsa: move netdevice notifier registration
net: dsa: simplify netdevice events handling
net: dsa: rollback bridging on error
net: dsa: change state setter scope
net: dsa: add switch notifier
net: dsa: introduce bridge notifier
include/net/dsa.h | 17 ++++++++
net/dsa/Makefile | 1 +
net/dsa/dsa.c | 16 ++++---
net/dsa/dsa2.c | 6 +++
net/dsa/dsa_priv.h | 8 +++-
net/dsa/slave.c | 121 +++++++++++++++++++++++++++++++++++------------------
net/dsa/switch.c | 85 +++++++++++++++++++++++++++++++++++++
7 files changed, 205 insertions(+), 49 deletions(-)
create mode 100644 net/dsa/switch.c
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2.11.0
