linux-kernel - Re: [PATCH v5 00/12] can: m_can: Optimizations for m

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Date:   Wed, 23 Aug 2023 08:51:48 +0200
From:   Martin Hundebøll <martin@...nix.com>
To:     Markus Schneider-Pargmann <msp@...libre.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>
Cc:     Vincent MAILHOL <mailhol.vincent@...adoo.fr>,
        Simon Horman <simon.horman@...igine.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Julien Panis <jpanis@...libre.com>
Subject: Re: [PATCH v5 00/12] can: m_can: Optimizations for m_can/tcan part 2

On Tue, 2023-07-18 at 09:56 +0200, Markus Schneider-Pargmann wrote:
> Hi Marc, Simon and everyone,
> 
> v5 got a rebase on v6.5 with some small style fixes as pointed out in
> v4.
> 
> 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 v6.5-rc1. Also available at
> https://gitlab.baylibre.com/msp8/linux/-/tree/topic/mcan-optimization/v6.5?ref_type=heads

For the whole series:
Tested-by: Martin Hundebøll <martin@...nix.com>

Thanks,
Martin

> Changes in v5:
> - Add back parenthesis in m_can_set_coalesce(). This will make
>   checkpatch unhappy but gcc happy.
> - Remove unused fifo_header variable in m_can_tx_handler().
> - Rebased to v6.5-rc1
> 
> 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@baylibre.com
> v2 -
> https://lore.kernel.org/lkml/20230125195059.630377-1-msp@baylibre.com
> v3 -
> https://lore.kernel.org/lkml/20230315110546.2518305-1-msp@baylibre.com/
> v4 -
> https://lore.kernel.org/lkml/20230621092350.3130866-1-msp@baylibre.com/
> 
> 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 | 517 +++++++++++++++++++++++++-------
> --
>  drivers/net/can/m_can/m_can.h |  35 ++-
>  2 files changed, 418 insertions(+), 134 deletions(-)
> 
> 
> base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5