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

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Date:   Fri, 7 Jan 2022 13:40:00 +0000
From:   Stefan Mätje <Stefan.Maetje@....eu>
To:     "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "wg@...ndegger.com" <wg@...ndegger.com>,
        "mkl@...gutronix.de" <mkl@...gutronix.de>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 0/4] can: esd: add support for esd GmbH PCIe/402 CAN
 interface

Hi,

is there any chance to get this patch 
https://lore.kernel.org/linux-can/20211201220328.3079270-1-stefan.maetje@esd.eu/
in the upcoming
5.17 release?

The patch still applies cleanly to linux-can-next "testing" at this tag:

https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git/tag/?h=linux-can-next-for-5.17-20220105

If it helps I would provide a patch v7 that is rebased to the mentioned
tag.

Any comment is appreciated.

Best regards,
    Stefan Mätje


Am Mittwoch, den 01.12.2021, 22:09 +0000 schrieb Stefan Mätje:
> Hi,
> 
> this is really patch v6. Missed to change the email subject. My bad.
> 
> Best regards,
>     Stefan Mätje
> 
> Am Mittwoch, den 01.12.2021, 23:03 +0100 schrieb Stefan Mätje:
> > 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/
> > 
> > *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.
> >