[v11,0/1] add support for ETAS ES58X CAN USB interfaces

Here is the v11 of the patch which reflect the latest comments I
received on the mailing list (thanks for that!). The biggest change is
the modification on the FIFO. Making the FIFO length a power of two
allow to remove the spinlocks and drastically reduce the complexity.

In parallel, I am working on the Transmitter Delay Compensation
parameters to the driver API. I will send a patch later.

Thanks for your comments!


Changes in v11 (2021-01-23):
  - Remove all WARN_ON() calls: these were use during development,
    relevant tests are done not to trigger these.
  - es58x_start_xmit(): added net_ratelimit() condition to prevent
    spamming dmesg.
  - add a new es58x_xmit_more() function and simplify the code of
    es58x_start_xmit()
  - Removed functions {es581_4,es58x_fd}_print_conf() which were only
    there for debug.
  - Additional comment for es58x_fd_param.bitrate_max.
  - Make the device FIFO size a power of two and modify the echo_skb
    indexes logic to prevent the use of spinlocks

Changes in v10 (2021-01-12):
  - Rebased on linux-can-next/testing and modified according to latest
    BQL patches.
Reference: https://lore.kernel.org/linux-can/20210111141930.693847-1-mkl@pengutronix.de/T/#m5f99d4da8e8934a75f9481ecc3137b59f3762413
  - Replaced __netdev_sent_queue() by netdev_sent_queue().

Changes in v9 (2021-01-09):
  - es58x_start_xmit(): do not use skb anymore after the call of
    can_put_echo_skb(). Rationale: can_put_echo_skb() calls
    skb_clone() and thus the original skb gets consumed (i.e. use
    after free issue).
  - es58x_start_xmit(): Add a "drop_skb" label to free the skb when
    errors occur.

Changes in v8 (2021-01-04):
  - The driver requires CRC16. Modified Kconfig accordingly.

Changes in v7 (2020-11-17):
  - Fix compilation issue if CONFIG_BQL is not set.
Reference: https://lkml.org/lkml/2020/11/15/163

Changes in v6 (2020-11-15):
  - Rebase the patch on the testing branch of linux-can-next.
  - Rename the helper functions according latest changes
    (e.g. can_cc_get_len() -> can_cc_dlc2len())
  - Fix comments of enum es58x_physical_layer and enum
    es58x_sync_edge.

Changes in v5 (2020-11-07):
  - Add support for DLC greater than 8.
  - All other patches from the previous series were either accepted or
    dismissed. As such, this is not a series any more but a single
    patch.

Changes in v4 (2020-10-17):
  - Remove struct es58x_abstracted_can_frame.
  - Fix formatting (spaces, comment style).
  - Transform macros into static inline functions when possible.
  - Fix the ctrlmode_supported flags in es581_4.c and removed
    misleading comments in enum es58x_samples_per_bit.
  - Rename enums according to the type.
  - Remove function es58x_can_put_echo_skb().
Reference: https://lkml.org/lkml/2020/10/10/53

Changes in v3 (2020-10-03):
  - Remove all the calls to likely() and unlikely().
Reference: https://lkml.org/lkml/2020/9/30/995

Changes in v2 (2020-09-30):
  - Fixed -W1 warnings (v1 was tested with GCC -WExtra but not with -W1).

v1 (2020-09-27):
 - First release


Yours sincerely,
Vincent

*** BLURB HERE ***

Vincent Mailhol (1):
  can: usb: etas_es58X: add support for ETAS ES58X CAN USB interfaces

 drivers/net/can/usb/Kconfig                 |   10 +
 drivers/net/can/usb/Makefile                |    1 +
 drivers/net/can/usb/etas_es58x/Makefile     |    3 +
 drivers/net/can/usb/etas_es58x/es581_4.c    |  529 ++++
 drivers/net/can/usb/etas_es58x/es581_4.h    |  207 ++
 drivers/net/can/usb/etas_es58x/es58x_core.c | 2519 +++++++++++++++++++
 drivers/net/can/usb/etas_es58x/es58x_core.h |  698 +++++
 drivers/net/can/usb/etas_es58x/es58x_fd.c   |  600 +++++
 drivers/net/can/usb/etas_es58x/es58x_fd.h   |  243 ++
 9 files changed, 4810 insertions(+)
 create mode 100644 drivers/net/can/usb/etas_es58x/Makefile
 create mode 100644 drivers/net/can/usb/etas_es58x/es581_4.c
 create mode 100644 drivers/net/can/usb/etas_es58x/es581_4.h
 create mode 100644 drivers/net/can/usb/etas_es58x/es58x_core.c
 create mode 100644 drivers/net/can/usb/etas_es58x/es58x_core.h
 create mode 100644 drivers/net/can/usb/etas_es58x/es58x_fd.c
 create mode 100644 drivers/net/can/usb/etas_es58x/es58x_fd.h


base-commit: 107a1f6fe7786124bd89fab74bdc478b630f1bfa