[RFC PATCH v2 net-next 0/4] DSA master state tracking

[Vladimir Oltean <vladimir.oltean@nxp.com>]

This patch set is provided solely for review purposes (therefore not to
be applied anywhere) and for Ansuel to test whether they resolve the
slowdown reported here:
https://patchwork.kernel.org/project/netdevbpf/cover/20211207145942.7444-1-ansuelsmth@gmail.com/

The patches posted here are mainly to offer a consistent
"master_state_change" chain of events to switches, without duplicates,
and always starting with operational=true and ending with
operational=false. This way, drivers should know when they can perform
Ethernet-based register access, and need not care about more than that.

Changes in v2:
- dropped some useless patches
- also check master operstate.

Vladimir Oltean (4):
  net: dsa: provide switch operations for tracking the master state
  net: dsa: stop updating master MTU from master.c
  net: dsa: hold rtnl_mutex when calling dsa_master_{setup,teardown}
  net: dsa: replay master state events in
    dsa_tree_{setup,teardown}_master

 include/net/dsa.h  | 11 +++++++
 net/dsa/dsa2.c     | 80 +++++++++++++++++++++++++++++++++++++++++++---
 net/dsa/dsa_priv.h | 13 ++++++++
 net/dsa/master.c   | 29 ++---------------
 net/dsa/slave.c    | 27 ++++++++++++++++
 net/dsa/switch.c   | 15 +++++++++
 6 files changed, 145 insertions(+), 30 deletions(-)

-- 
2.25.1