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Date:   Wed, 21 Dec 2022 16:25:19 +0100
From:   Markus Schneider-Pargmann <>
To:     Marc Kleine-Budde <>,
        Chandrasekar Ramakrishnan <>,
        Wolfgang Grandegger <>
Cc:     Vincent MAILHOL <>,,,,
        Markus Schneider-Pargmann <>
Subject: [PATCH 00/18] can: m_can: Optimizations for m_can/tcan part 2

Hi Marc and everyone,

this is the second part now. I know it is the merge window right now but
I am quite sure this won't be merged immediately anyways, so if you have
some time for some comments I would appreciate it. So it is still based
on v6.1-rc8 + the patches that got applied.

I tried to do as small patches as possible so it is easier to
understand. The series changed a lot compared to v1 I sent so I didn't
call it v2. There are a lot of new patches as well.

The series contains a few small fixes and optimizations at the
beginning, then adding coalescing support and at the end removing the
restrictions on the number of parallel transmits in flight.

Note that the last patch 'Implement transmit submission coalescing' does
not perform well for me in a loopback testing setup. However I think it
may work well in normal testcases. I attached this mechanism to the
tx-frames coalescing option, let me know if this is the correct option.


part 1:
v1 -
v2 -

Markus Schneider-Pargmann (18):
  can: tcan4x5x: Remove reserved register 0x814 from writable table
  can: tcan4x5x: Check size of mram configuration
  can: m_can: Remove repeated check for is_peripheral
  can: m_can: Always acknowledge all interrupts
  can: m_can: Remove double interrupt enable
  can: m_can: Disable unused interrupts
  can: m_can: Keep interrupts enabled during peripheral read
  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: 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           | 498 ++++++++++++++++++------
 drivers/net/can/m_can/m_can.h           |  36 +-
 drivers/net/can/m_can/tcan4x5x-core.c   |   5 +
 drivers/net/can/m_can/tcan4x5x-regmap.c |   1 -
 4 files changed, 418 insertions(+), 122 deletions(-)


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