[PATCHv6 net-next 0/4] net: common feature compute for upper interface

[Hangbin Liu <liuhangbin@gmail.com>]

Some high-level virtual drivers need to compute features from their
lower devices, but each currently has its own implementation and may
miss some feature computations. This patch set introduces a common function
to compute features for such devices.

Currently, bonding, team, and bridge have been updated to use the new
helper.

v6:
  * no update, only rename UPPER_DEV_* to MASTER_UPPER_DEV_* (Jiri Pirko)

v5:
  * rename VIRTUAL_DEV_* to UPPER_DEV_* (Jiri Pirko)
  * use IS_ENABLED() instead of ifdef (Simon Horman)
  * init max_headroom/tailroom (Simon Horman)
  * link: https://lore.kernel.org/netdev/20251016033828.59324-1-liuhangbin@gmail.com

v4:
  * update needed_{headroom, tailroom} in the common helper (Ido Schimmel)
  * remove unneeded err in team (Stanislav Fomichev)
  * remove selftest as `ethtool -k` does not test the dev->*_features. We
    can add back the selftest when there is a good way to test. (Sabrina Dubroca)
  * link: https://lore.kernel.org/netdev/20251014080217.47988-1-liuhangbin@gmail.com

v3:
  a) fix hw_enc_features assign order (Sabrina Dubroca)
  b) set virtual dev feature definition in netdev_features.h (Jakub Kicinski)
  c) remove unneeded err in team_del_slave (Stanislav Fomichev)
  d) remove NETIF_F_HW_ESP test as it needs to be test with GSO pkts (Sabrina Dubroca)

v2:
  a) remove hard_header_len setting. I will set needed_headroom for bond/team
     in a separate patch as bridge has it's own ways. (Ido Schimmel)
  b) Add test file to Makefile, set RET=0 to a proper location. (Ido Schimmel)

Hangbin Liu (4):
  net: add a common function to compute features for upper devices
  bonding: use common function to compute the features
  team: use common function to compute the features
  net: bridge: use common function to compute the features

 drivers/net/bonding/bond_main.c | 99 ++-------------------------------
 drivers/net/team/team_core.c    | 83 ++-------------------------
 include/linux/netdev_features.h | 18 ++++++
 include/linux/netdevice.h       |  1 +
 net/bridge/br_if.c              | 22 +-------
 net/core/dev.c                  | 88 +++++++++++++++++++++++++++++
 6 files changed, 120 insertions(+), 191 deletions(-)

-- 
2.50.1