[PATCH net-next v2 00/10] genetlink: provide struct genl_info to dumps

[Jakub Kicinski <kuba@kernel.org>]

One of the biggest (which is not to say only) annoyances with genetlink
handling today is that doit and dumpit need some of the same information,
but it is passed to them in completely different structs.

The implementations commonly end up writing a _fill() method which
populates a message and have to pass at least 6 parameters. 3 of which
are extracted manually from request info.

After a lot of umming and ahing I decided to populate struct genl_info
for dumps, without trying to factor out only the common parts.
This makes the adoption easiest.

In the future we may add a new version of dump which takes
struct genl_info *info as the second argument, instead of
struct netlink_callback *cb. For now developers have to call
genl_info_dump(cb) to get the info.

Typical genetlink families no longer get exposed to netlink protocol
internals like pid and seq numbers.

v2:
 - replace the GENL_INFO_NTF() macro with init helper
 - fix the commit messages
v1: https://lore.kernel.org/all/20230809182648.1816537-1-kuba@kernel.org/

Jakub Kicinski (10):
  genetlink: push conditional locking into dumpit/done
  genetlink: make genl_info->nlhdr const
  genetlink: remove userhdr from struct genl_info
  genetlink: add struct genl_info to struct genl_dumpit_info
  genetlink: use attrs from struct genl_info
  genetlink: add a family pointer to struct genl_info
  genetlink: add genlmsg_iput() API
  netdev-genl: use struct genl_info for reply construction
  ethtool: netlink: simplify arguments to ethnl_default_parse()
  ethtool: netlink: always pass genl_info to .prepare_data

 drivers/block/drbd/drbd_nl.c    |   9 +--
 drivers/net/wireguard/netlink.c |   2 +-
 include/net/genetlink.h         |  76 ++++++++++++++++++--
 net/core/netdev-genl.c          |  17 +++--
 net/devlink/health.c            |   2 +-
 net/devlink/leftover.c          |   6 +-
 net/ethtool/channels.c          |   2 +-
 net/ethtool/coalesce.c          |   6 +-
 net/ethtool/debug.c             |   2 +-
 net/ethtool/eee.c               |   2 +-
 net/ethtool/eeprom.c            |   9 ++-
 net/ethtool/features.c          |   2 +-
 net/ethtool/fec.c               |   2 +-
 net/ethtool/linkinfo.c          |   2 +-
 net/ethtool/linkmodes.c         |   2 +-
 net/ethtool/linkstate.c         |   2 +-
 net/ethtool/mm.c                |   2 +-
 net/ethtool/module.c            |   5 +-
 net/ethtool/netlink.c           |  33 ++++-----
 net/ethtool/netlink.h           |   2 +-
 net/ethtool/pause.c             |   5 +-
 net/ethtool/phc_vclocks.c       |   2 +-
 net/ethtool/plca.c              |   4 +-
 net/ethtool/privflags.c         |   2 +-
 net/ethtool/pse-pd.c            |   6 +-
 net/ethtool/rings.c             |   5 +-
 net/ethtool/rss.c               |   3 +-
 net/ethtool/stats.c             |   5 +-
 net/ethtool/strset.c            |   2 +-
 net/ethtool/tsinfo.c            |   2 +-
 net/ethtool/tunnels.c           |   2 +-
 net/ethtool/wol.c               |   5 +-
 net/ieee802154/nl802154.c       |   4 +-
 net/ncsi/ncsi-netlink.c         |   2 +-
 net/ncsi/ncsi-netlink.h         |   2 +-
 net/netlink/genetlink.c         | 119 +++++++++++++++-----------------
 net/nfc/netlink.c               |   4 +-
 net/openvswitch/conntrack.c     |   2 +-
 net/openvswitch/datapath.c      |  29 ++++----
 net/openvswitch/meter.c         |  10 +--
 net/tipc/netlink_compat.c       |   4 +-
 net/tipc/node.c                 |   4 +-
 net/tipc/socket.c               |   2 +-
 net/tipc/udp_media.c            |   2 +-
 44 files changed, 234 insertions(+), 178 deletions(-)

-- 
2.41.0