[v3,0/4] report the controller capabilities through the netlink interface

Message

Vincent Mailhol Oct. 25, 2021, 5:22 p.m. UTC

The main purpose of this series is to report the CAN controller
capabilities. The proposed method reuses the existing struct
can_ctrlmode and thus do not need a new IFLA_CAN_* entry.

While doing so, I also realized that can_priv::ctrlmode_static could
actually be derived from the other ctrlmode fields. So I added three
extra patches to the series: one to replace that field with a
function, one to add a safeguard on can_set_static_ctrlmode() and one
to repack struct can_priv and fill the hole created after removing
can_priv::ctrlmode_priv.

Please note that the first three patches are not required by the
fourth one. I am just grouping everything in the same series because
the patches all revolve around the controller modes.


** Changelog **

v2 -> v3:

  - Make can_set_static_ctrlmode() return an error and adjust the
    drivers which use this helper function accordingly.

v1 -> v2:

  - Add a first patch to replace can_priv::ctrlmode_static by the
    inline function can_get_static_ctrlmode()

  - Add a second patch to reorder the fields of struct can_priv for
    better packing (save eight bytes on x86_64 \o/)

  - Rewrite the comments of the third patch "can: netlink: report the
    CAN controller mode supported flags" (no changes on the code
    itself).

Vincent Mailhol (4):
  can: dev: replace can_priv::ctrlmode_static by
    can_get_static_ctrlmode()
  can: dev: add sanity check in can_set_static_ctrlmode()
  can: dev: reorder struct can_priv members for better packing
  can: netlink: report the CAN controller mode supported flags

 drivers/net/can/dev/dev.c         |  5 +++--
 drivers/net/can/dev/netlink.c     |  7 +++++--
 drivers/net/can/m_can/m_can.c     | 10 +++++++---
 drivers/net/can/rcar/rcar_canfd.c |  4 +++-
 include/linux/can/dev.h           | 24 +++++++++++++++++-------
 include/uapi/linux/can/netlink.h  |  5 ++++-
 6 files changed, 39 insertions(+), 16 deletions(-)