Re: [PATCH v6 0/4] can: esd: add support for esd GmbH PCIe/402 CAN interface

On 01.12.2021 23:03:24, Stefan Mätje wrote:

The purpose of this patch is to introduce a new CAN driver to support
the esd GmbH 402 family of CAN interface boards. The hardware design
is based on a CAN controller implemented in a FPGA attached to a
PCIe link.

More information on these boards can be found following the links
included in the commit message.

This patch supports all boards but will operate the CAN-FD capable
boards only in Classic-CAN mode. The CAN-FD support will be added
when the initial patch has stabilized.

The patch is reuses the previous work of my former colleague:
Link: https://lore.kernel.org/linux-can/1426592308-23817-1-git-send-email-thomas.koerper@esd.eu/ (local)

*Note*: scripts/checkpatch.pl still emits the following warnings:
  - esd_402_pci-core.c:270: Possible unnecessary 'out of memory' message
    This error message is there to tell the user that the DMA allocation
    failed and not an allocation for normal kernel memory.
  - esdacc.h:255: The irq_cnt pointer is still declared volatile and
    this has a reason and is explained in detail in the header
    referencing the exception noted in volatile-considered-harmful.rst.

The patch is based on the linux-can-next testing branch.

Changes in v6:
  - Fixed the statistic handling of RX overrun errors and increase 
    net_device_stats::rx_errors instead of net_device_stats::rx_dropped.
  - Added a patch to not increase rx statistics when generating a CAN
    rx error message frame as suggested on the linux-can list.
  - Added a patch to not not increase rx_bytes statistics for RTR frames
    as suggested on the linux-can list.

    The last two patches change the statistics handling from the previous
    style used in other drivers to the newly suggested one.

Please squash the last 2 patches into patch 2.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |