[PATCH v4 00/12] can: m_can: Optimizations for m_can/tcan part 2

[Markus Schneider-Pargmann]

Hi Marc, Simon and everyone,

thanks again for taking the time for review.

This version has the fixes for the issues you pointed out in v3.
It is tested on tcan455x but I don't have hardware with mcan on the SoC
myself so any testing is appreciated.

The series implements many small and bigger throughput improvements and
adds rx/tx coalescing at the end.

Based on v6.4-rc1. Also available at
https://gitlab.baylibre.com/msp8/linux/-/tree/topic/mcan-optimization/v6.4?ref_type=heads

Best,
Markus

Changes in v4:
- Create and use struct m_can_fifo_element in m_can_tx_handler
- Fix memcpy_and_pad to copy the full buffer
- Fixed a few checkpatch warnings
- Change putidx to be unsigned
- Print hard_xmit error only once when TX FIFO is full

Changes in v3:
- Remove parenthesis in error messages
- Use memcpy_and_pad for buffer copy in 'can: m_can: Write transmit
  header and data in one transaction'.
- Replace spin_lock with spin_lock_irqsave. I got a report of a
  interrupt that was calling start_xmit just after the netqueue was
  woken up before the locked region was exited. spin_lock_irqsave should
  fix this. I attached the full stack at the end of the mail if someone
  wants to know.
- Rebased to v6.3-rc1.
- Removed tcan4x5x patches from this series.

Changes in v2:
- Rebased on v6.2-rc5
- Fixed missing/broken accounting for non peripheral m_can devices.

previous versions:
v1 - https://lore.kernel.org/lkml/20221221152537.751564-1-msp@xxxxxxxxxxxx
v2 - https://lore.kernel.org/lkml/20230125195059.630377-1-msp@xxxxxxxxxxxx
v3 - https://lore.kernel.org/lkml/20230315110546.2518305-1-msp@xxxxxxxxxxxx/

Markus Schneider-Pargmann (12):
  can: m_can: Write transmit header and data in one transaction
  can: m_can: Implement receive coalescing
  can: m_can: Implement transmit coalescing
  can: m_can: Add rx coalescing ethtool support
  can: m_can: Add tx coalescing ethtool support
  can: m_can: Use u32 for putidx
  can: m_can: Cache tx putidx
  can: m_can: Use the workqueue as queue
  can: m_can: Introduce a tx_fifo_in_flight counter
  can: m_can: Use tx_fifo_in_flight for netif_queue control
  can: m_can: Implement BQL
  can: m_can: Implement transmit submission coalescing

 drivers/net/can/m_can/m_can.c | 516 +++++++++++++++++++++++++---------
 drivers/net/can/m_can/m_can.h |  35 ++-
 2 files changed, 418 insertions(+), 133 deletions(-)


base-commit: ac9a78681b921877518763ba0e89202254349d1b
-- 
2.40.1