[RFC,00/10] Configuring congestion watermarks on ocelot switch using devlink-sb

Message

Vladimir Oltean Oct. 13, 2020, 1:48 p.m. UTC

In some applications, it is important to create resource reservations in
the Ethernet switches, to prevent background traffic, or deliberate
attacks, from inducing denial of service into the high-priority traffic.

These patches give the user some knobs to turn. The ocelot switches
support per-port and per-port-tc reservations, on ingress and on egress.
The resources that are monitored are packet buffers (in cells of 60
bytes each) and frame references.

The frames that exceed the reservations can optionally consume from
sharing watermarks which are not per-port but global across the switch.
There are 10 sharing watermarks, 8 of them are per traffic class and 2
are per drop priority.

I am configuring the hardware using the best of my knowledge, and mostly
through trial and error. Same goes for devlink-sb integration. Feedback
is welcome.

Vladimir Oltean (10):
  net: mscc: ocelot: auto-detect packet buffer size and number of frame
    references
  net: mscc: ocelot: add ops for decoding watermark threshold and
    occupancy
  net: dsa: add ops for devlink-sb
  net: dsa: felix: reindent struct dsa_switch_ops
  net: dsa: felix: perform teardown in reverse order of setup
  net: mscc: ocelot: export NUM_TC constant from felix to common switch
    lib
  net: mscc: ocelot: delete unused ocelot_set_cpu_port prototype
  net: mscc: ocelot: register devlink ports
  net: mscc: ocelot: initialize watermarks to sane defaults
  net: mscc: ocelot: configure watermarks using devlink-sb

 drivers/net/dsa/ocelot/felix.c             | 212 +++--
 drivers/net/dsa/ocelot/felix.h             |   2 -
 drivers/net/dsa/ocelot/felix_vsc9959.c     |  21 +-
 drivers/net/dsa/ocelot/seville_vsc9953.c   |  20 +-
 drivers/net/ethernet/mscc/Makefile         |   3 +-
 drivers/net/ethernet/mscc/ocelot.c         |  23 +-
 drivers/net/ethernet/mscc/ocelot.h         |   9 +-
 drivers/net/ethernet/mscc/ocelot_devlink.c | 901 +++++++++++++++++++++
 drivers/net/ethernet/mscc/ocelot_net.c     | 235 ++++++
 drivers/net/ethernet/mscc/ocelot_vsc7514.c |  47 +-
 include/net/dsa.h                          |  34 +
 include/soc/mscc/ocelot.h                  |  54 +-
 include/soc/mscc/ocelot_qsys.h             |   7 +-
 net/dsa/dsa2.c                             | 174 +++-
 14 files changed, 1675 insertions(+), 67 deletions(-)
 create mode 100644 drivers/net/ethernet/mscc/ocelot_devlink.c