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

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