[PATCH batadv v2 0/5] batman-adv: drop global hard interface list

The global hard interface list was used in the past to provide and sysfs
(debugfs, procfs) based configuration interface. This requirement is gone
after it was switched to generic netlink and NETLINK_ROUTE. And after the
wifi-flags cache was introduced, it is also no longer used to get
non-batman-adv attached interface information (for ap_isolation and
re-broadcast configuration).

But this odd net_devices list (batadv_hardif_list) stayed and caused some
headaches:

* memory requirement increased (useless) for each network interface of the
  system
* massive increase of various ethernet operations due to the O(n) nature of
  this global list
* the code had to handle switch of a batadv_hard_iface from one mesh_iface
  to either NULL or a different mesh_iface

Just get rid of it now and start to simplify the code around it.

This RFC is on purpose not Signed-off-by because I just want to restart the
discussion but didn't discuss this with the original author (nor documented
the changes in each patch in detail). And it is also not meant to look like
I've reviewed the changes and Ack it - this is unfortunately something
which I have to do again with this rebased version.

I will later post an range-diff which contains all the changes.

Signed-off-by: Sven Eckelmann <[email protected]>
---
Changes in v2:
- rebased
- submit as RFC to get the discussion started again
- drop already merged "batman-adv: store hard_iface as iflink private data"
- switch from kzalloc to kzalloc_obj
- update author's mail and name
- fix reference counting for batman_adv_ptype
- Link to v1: https://patch.msgid.link/0b26554afea5203820faef1dfb498af7533a9b5d.1747687504.git.mschiffer@universe-factory.net

---
Nora Schiffer (4):
      batman-adv: only create hardif while a netdev is part of a mesh
      batman-adv: remove BATADV_IF_NOT_IN_USE hardif state
      batman-adv: remove global hardif list
      batman-adv: move hardif generation counter into batadv_priv

Sven Eckelmann (1):
      batman-adv: tt: directly retrieve wifi flags of net_device

 net/batman-adv/bat_iv_ogm.c        |   3 +-
 net/batman-adv/bat_v_elp.c         |   3 +-
 net/batman-adv/hard-interface.c    | 183 +++++++++++++++----------------------
 net/batman-adv/hard-interface.h    |  11 +--
 net/batman-adv/main.c              |   6 --
 net/batman-adv/main.h              |   3 -
 net/batman-adv/mesh-interface.c    |  13 +--
 net/batman-adv/netlink.c           |   4 +-
 net/batman-adv/originator.c        |   4 -
 net/batman-adv/translation-table.c |  14 +--
 net/batman-adv/types.h             |   6 +-
 11 files changed, 93 insertions(+), 157 deletions(-)
---
base-commit: bba80ddd693e6d82a0b1f456511904cfefd5df24
change-id: 20260531-drop-hardif-list-bcf812da69dd

Best regards,
--  
Sven Eckelmann <[email protected]>