[PATCH net-next RFC v1 0/4] Add per port devlink regions

[Andrew Lunn <andrew@lunn.ch>]

This patchset extends devlink regions to support per port regions, and
them makes use of them to support the ports of the mv88e6xxx switches.

root@rap:~# devlink region show
mdio_bus/gpio-0:00/global1: size 64 snapshot []
mdio_bus/gpio-0:00/global2: size 64 snapshot []
mdio_bus/gpio-0:00/atu: size 49152 snapshot []
mdio_bus/gpio-0:00/1/port: size 64 snapshot []
mdio_bus/gpio-0:00/2/port: size 64 snapshot []
mdio_bus/gpio-0:00/3/port: size 64 snapshot []
mdio_bus/gpio-0:00/4/port: size 64 snapshot []
mdio_bus/gpio-0:00/8/port: size 64 snapshot []

root@rap:~# devlink region new mdio_bus/gpio-0:00/1/port snapshot 42
root@rap:~# devlink region dump mdio_bus/gpio-0:00/1/port snapshot 42
0000000000000000 4f 1e 3e 20 00 01 01 39 3f 05 00 00 fd 07 00 00
0000000000000010 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 91
0000000000000020 00 00 00 00 00 00 00 00 00 00 00 00 22 00 00 00
0000000000000030 07 3e 00 00 00 00 00 80 00 00 00 00 00 00 5b 00

DSA only instantiates devlink ports for switch ports which are used.
For this hardware, only 4 user ports and the CPU port have devlink
ports, which explains the discontinuous port regions.

Andrew Lunn (4):
  net: devlink: Add support for port regions
  net: dsa: Add devlink port regions support to DSA
  net: dsa: Add helper for converting devlink port to ds and port
  net: dsa: mv88e6xxx: Add per port devlink regions

 drivers/net/dsa/mv88e6xxx/chip.c    |   8 +
 drivers/net/dsa/mv88e6xxx/devlink.c |  61 +++++++
 drivers/net/dsa/mv88e6xxx/devlink.h |   6 +-
 include/net/devlink.h               |  27 +++
 include/net/dsa.h                   |  19 +++
 net/core/devlink.c                  | 250 +++++++++++++++++++++++++---
 net/dsa/dsa.c                       |  14 ++
 7 files changed, 358 insertions(+), 27 deletions(-)

-- 
2.28.0