[PATCH net-next 00/11] net: dsa: add generic debugfs interface

[Vivien Didelot]

This patch series adds a generic debugfs interface for the DSA
framework, so that all switch devices benefit from it, e.g. Marvell,
Broadcom, Microchip or any other DSA driver.

This is really convenient for debugging, especially CPU ports and DSA
links which are not exposed to userspace as net device. This interface
is currently the only way to easily inspect the hardware for such ports.

With the patch series, any switch device user is able to query the
hardware for the supported tagging protocol, the ports stats and
registers, as well as their FDB, MDB and VLAN entries.

This support is only compiled if CONFIG_DEBUG_FS is enabled. Below is
and example of usage of this interface on a multi-chip switch fabric:

    # mount -t debugfs none /sys/kernel/debug
    # cd /sys/kernel/debug/dsa/
    # ls
    switch0  switch1 switch2
    # ls -l switch0/
    drwxr-xr-x 2 root root 0 Jan  1 00:00 port0
    drwxr-xr-x 2 root root 0 Jan  1 00:00 port1
    drwxr-xr-x 2 root root 0 Jan  1 00:00 port2
    drwxr-xr-x 2 root root 0 Jan  1 00:00 port5
    drwxr-xr-x 2 root root 0 Jan  1 00:00 port6
    -r--r--r-- 1 root root 0 Jan  1 00:00 tag_protocol
    -r--r--r-- 1 root root 0 Jan  1 00:00 tree
    # ls -l switch0/port6
    -r--r--r-- 1 root root 0 Jan  1 00:00 fdb
    -r--r--r-- 1 root root 0 Jan  1 00:00 mdb
    -r--r--r-- 1 root root 0 Jan  1 00:00 regs
    -r--r--r-- 1 root root 0 Jan  1 00:00 stats
    -r--r--r-- 1 root root 0 Jan  1 00:00 vlan
    # cat switch0/port2/vlan
    vid 42  pvid  untagged
    # cat switch0/port1/fdb
    vid 0    12:34:56:78:90:ab    static    unicast
    # pr -mt switch0/port{5,6}/stats
    in_good_octets      : 0             in_good_octets      : 13824
    in_bad_octets       : 0             in_bad_octets       : 0
    in_unicast          : 0             in_unicast          : 0
    in_broadcasts       : 0             in_broadcasts       : 216
    in_multicasts       : 0             in_multicasts       : 0
    in_pause            : 0             in_pause            : 0
    in_undersize        : 0             in_undersize        : 0
    ...
    # pr -mt switch0/port{5,6}/regs
     0: 4e07			     0: 4d04
     1: 403e			     1: 003d
     2: 0000			     2: 0000
     3: 3521			     3: 3521
     4: 0533			     4: 373f
     5: 8000			     5: 0000
     6: 005f			     6: 003f
     7: 002a			     7: 002a
    ...

where switch0 port5 and port6 are CPU and DSA ports of a ZII Rev B.

Vivien Didelot (11):
  net: dsa: legacy: assign dst->applied
  net: dsa: add debugfs interface
  net: dsa: debugfs: add tree
  net: dsa: debugfs: add tag_protocol
  net: dsa: debugfs: add port stats
  net: dsa: debugfs: add port registers
  net: dsa: debugfs: add port fdb
  net: dsa: restore mdb dump
  net: dsa: debugfs: add port mdb
  net: dsa: restore VLAN dump
  net: dsa: debugfs: add port vlan

 drivers/net/dsa/b53/b53_common.c       |  41 +++
 drivers/net/dsa/b53/b53_priv.h         |   2 +
 drivers/net/dsa/bcm_sf2.c              |   1 +
 drivers/net/dsa/dsa_loop.c             |  38 +++
 drivers/net/dsa/microchip/ksz_common.c |  41 +++
 drivers/net/dsa/mv88e6xxx/chip.c       |  82 +++++-
 include/net/dsa.h                      |  15 ++
 net/dsa/Kconfig                        |  14 +
 net/dsa/Makefile                       |   1 +
 net/dsa/debugfs.c                      | 453 +++++++++++++++++++++++++++++++++
 net/dsa/dsa.c                          |   3 +
 net/dsa/dsa2.c                         |   4 +
 net/dsa/dsa_priv.h                     |  13 +
 net/dsa/legacy.c                       |   7 +
 14 files changed, 707 insertions(+), 8 deletions(-)
 create mode 100644 net/dsa/debugfs.c

-- 
2.14.0