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@xxxxxxxxxxxxxx/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
--
2.26.2
