[RFC PATCH 00/14] can: netlink: add CAN XL

[Vincent Mailhol <mailhol.vincent@wanadoo.fr>]

Because of popular request [1] and to celebrate the fact that I joined
the kernel web of trust this week [2], here is an RFC to introduce the
CAN XL netlink support.

The logic is simple. The CAN XL basically just reuse the same kind of
parameters as CAN FD: the databittiming and the TDC. So the series is
just a bunch of refactor to either:

  - factorize code.
  - rename some variable to differentiate between CAN FD and XL.
  - make some function more generic to accept both CAN FD and XL.

The feature is working™: there is a dummy driver at the end of the
series to show the traffic from the userland to a driver. This said, I
did close to zero testing. Once I had one CAN XL frame reaching the
driver, I call it a day, and decided to send the work. Regardless, it
is Sunday night. If I do not send it now, that would be next week-end.
Probably some mistakes are hidden here and there, but this should be
enough for an RFC level.

Also, I am not fully happy that can_dbt_changelink() requires 8
parameters. I will probably revisit this later on. But for the moment,
I think this is acceptable for an RFC.

Overall, I do not want to rush this series. Linus should send the rc7
anytime soon, and the merge window will probably start in eight days.
I do not think this series will be finalized by then. I still need to
give a deeper look at ISO 11898-1:2024 [3] to check that everything is
good. However, if I receive positive feedback on this RFC, I would
probably like to have the first patch merged so that I do not have to
rebase that tree wide patch each time someone makes a change.

I will send a second RFC series for iplink2 just after this one. Stay
tuned!

[1] https://lore.kernel.org/linux-can/CAEQ16vpxthctdrpv0kBKEZJA8VNYffjGGPBGBY93RmKDD49bAQ@mail.gmail.com/
[2] https://git.kernel.org/pub/scm/docs/kernel/pgpkeys.git/commit/?id=81d335d3586c
[3] https://www.iso.org/fr/standard/86384.html

Vincent Mailhol (14):
  can: dev: add struct data_bittiming_params to group FD parameters
  can: netlink: replace tabulation by space in assignement
  can: bittiming: rename CAN_CTRLMODE_TDC_MASK into
    CAN_CTRLMODE_FD_TDC_MASK
  can: bittiming: rename can_tdc_is_enabled() into
    can_fd_tdc_is_enabled()
  can: netlink: can_changelink(): rename tdc_mask into
    fd_tdc_flag_provided
  can: netlink: make can_tdc_changelink() FD agnostic
  can: netlink: add can_dtb_changelink()
  can: netlink: add can_validate_tdc()
  can: netlink: make can_tdc_get_size() FD agnostic
  can: netlink: make can_tdc_fill_info() FD agnostic
  can: netlink: document which symbols are FD specific
  can: netlink: add CAN XL support
  can: netlink: add userland error messages
  !!! DO NOT MERGE !!! can: add dummyxl driver

 drivers/net/can/Kconfig                       |   8 +
 drivers/net/can/Makefile                      |   1 +
 drivers/net/can/ctucanfd/ctucanfd_base.c      |   8 +-
 drivers/net/can/dev/calc_bittiming.c          |   2 +-
 drivers/net/can/dev/dev.c                     |  12 +-
 drivers/net/can/dev/netlink.c                 | 422 ++++++++++++------
 drivers/net/can/dummyxl.c                     | 224 ++++++++++
 drivers/net/can/flexcan/flexcan-core.c        |   4 +-
 drivers/net/can/ifi_canfd/ifi_canfd.c         |  10 +-
 drivers/net/can/kvaser_pciefd.c               |   6 +-
 drivers/net/can/m_can/m_can.c                 |   8 +-
 drivers/net/can/peak_canfd/peak_canfd.c       |   6 +-
 drivers/net/can/rcar/rcar_canfd.c             |   4 +-
 .../net/can/rockchip/rockchip_canfd-core.c    |   4 +-
 .../can/rockchip/rockchip_canfd-timestamp.c   |   2 +-
 .../net/can/spi/mcp251xfd/mcp251xfd-core.c    |   4 +-
 drivers/net/can/usb/esd_usb.c                 |   6 +-
 drivers/net/can/usb/etas_es58x/es58x_core.c   |   4 +-
 drivers/net/can/usb/etas_es58x/es58x_fd.c     |   8 +-
 drivers/net/can/usb/gs_usb.c                  |   8 +-
 drivers/net/can/usb/kvaser_usb/kvaser_usb.h   |   2 +-
 .../net/can/usb/kvaser_usb/kvaser_usb_core.c  |   6 +-
 drivers/net/can/usb/peak_usb/pcan_usb_core.c  |   6 +-
 drivers/net/can/xilinx_can.c                  |   6 +-
 include/linux/can/bittiming.h                 |   4 +-
 include/linux/can/dev.h                       |  39 +-
 include/uapi/linux/can/netlink.h              |  21 +-
 27 files changed, 606 insertions(+), 229 deletions(-)
 create mode 100644 drivers/net/can/dummyxl.c

-- 
2.45.2