Hi,
are there any comments on this patch besides the ones from Vincent?
Is there anything I can do to pave the path for this patch?
Best regards,
Stefan
Am Mittwoch, dem 22.11.2023 um 17:02 +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@xxxxxx/
>
>
> The patch is based on the linux-can-next main branch.
>
> Changed in v11:
> No functional, only editorial changes due to feedback on v10.
> - Make lifetime of macros used for hardware timestamp calculation
> very short by #undef-ing them after use.
> - Fixed insertion order of new entry in MAINTAINERS file.
>
> Changed in v10:
> Most changes due to feedback by Vincent Mailhol
> https://lore.kernel.org/linux-can/CAMZ6RqLOAC930GNOU+pWuoi6FgYwFOuFrSyAzVjvE2fuVgy8oA@xxxxxxxxxxxxxx/
> - Add support for ethtool operations by using default operations
> provided by the can_dev module for drivers with hardware time
> stamp support.
> - Factor out core unregistration into pci402_unregister_core().
> - Factor out getting next TX fifo index into acc_tx_fifo_next().
> - Stop counting alloc_can_err_skb() failures in rx_dropped statistic.
> - Add CAN_ERR_CNT flag in CAN error frames as needed.
> - Rework function acc_reset_fpga(). To clear I^2C bus enable bit
> is not necessary after FPGA reset.
> - Simplify struct acc_bmmsg_rxtxdone layout.
> - Additional non functional changes due to feedback by Vincent
> - Some spelling corrections: ESDACC -> esdACC
>
> Changes in v9:
> - Fix returning success error code in case of allocation failure in
> pci402_probe().
>
> Changes in v8:
> - Rebased to 6.6-rc2 on linux-can-next branch main
>
> Changes in v7:
> - Numerous changes. Find the quoted with inline comments about changes
> below after the changes list. Stuff that I don't understand and
> where I have questions is marked with ????.
> Unfortunately I will be AFK till 28th of November.
>
> 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.
>
> Changes in v5:
> - Added the initialization for netdev::dev_port as it is implemented
> for another CAN driver. See
> https://lore.kernel.org/linux-can/20211026180553.1953189-1-mailhol.vincent@xxxxxxxxxx/
>
> Changes in v4:
> - Fixed the build failure on ARCH=arm64 that was found by the Intel
> kernel test robot. See
> https://lore.kernel.org/linux-can/202109120608.7ZbQXkRh-lkp@xxxxxxxxx/
>
> Removed error monitoring code that used GCC's built-in compiler
> functions for atomic access (__sync_* functions). GCC versions
> after 9 (tested with "gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04)")
> don't implement the intrinsic atomic as in-line code but call
> "__aarch64_ldadd4_acq_rel" on arm64. This GCC support function
> is not exported by the kernel and therefore the module build
> post-processing fails.
>
> Removed that code because the error monitoring never showed a
> problem during the development this year.
>
>
> Changes in v3:
> - Rework the bus-off restart logic in acc_set_mode() and
> handle_core_msg_errstatechange() to call netif_wake_queue() from the
> error active event.
> - Changed pci402_init_card() to allocate a variable sized array of
> struct acc_core using devm_kcalloc() instead of using a fixed size
> array in struct pci402_card.
> - Changed handle_core_msg_txabort() to release aborted TX frames in
> TX FIFO order.
> - Fixed the acc_close() function to abort all pending TX request in
> esdACC controller.
> - Fixed counting of transmit aborts in handle_core_msg_txabort().
> It is now done like in can_flush_echo_skb().
> - Fixed handle_core_msg_buserr() to create error frames including the
> CAN RX and TX error counters that were missing.
> - Fixed acc_set_bittiming() neither to touch LOM mode setting of
> esdACC controller nor to enter or leave RESET mode.
> The esdACC controller is going active on the CAN bus in acc_open()
> and is going inactive (RESET mode) again in acc_close().
> - Rely on the automatic release of memory fetched by devm_kzalloc().
> But still use devm_irq_free() explicitely to make sure that the
> interrupt handler is disconnected at that point.
> This avoids a possible crash in non-MSI mode due to the IRQ
> triggered by another device on the same PCI IRQ line.
> - Changed to use DMA map API instead of pci_*_consistent compatibility
> wrappers.
> - Fixed stale email references and updated copyright information.
> - Removed any traces of future CAN-FD support.
>
>
> Changes in v2:
> - Avoid warning triggered by -Wshift-count-overflow on architectures
> with 32-bit dma_addr_t.
> - Fixed Makefile not to build the kernel module always. Doing this
> renamed esd402_pci.c to esd_402_pci-core.c as recommended by Marc.
>
> previous versions:
> v1 - https://lore.kernel.org/linux-can/20210728203647.15240-1-Stefan.Maetje@xxxxxx/
> v2 - https://lore.kernel.org/linux-can/20210730173805.3926-1-Stefan.Maetje@xxxxxx/
> v3 - https://lore.kernel.org/linux-can/20210908164640.23243-1-stefan.maetje@xxxxxx/
> v4 - https://lore.kernel.org/linux-can/20210916172152.5127-1-stefan.maetje@xxxxxx/
> v5 - https://lore.kernel.org/linux-can/20211109155326.2608822-1-stefan.maetje@xxxxxx/
> v6 - https://lore.kernel.org/linux-can/20211201220328.3079270-1-stefan.maetje@xxxxxx/
> v7 - https://lore.kernel.org/linux-can/20221106224156.3619334-1-stefan.maetje@xxxxxx/
> v8 - https://lore.kernel.org/linux-can/20231025141635.1459606-1-stefan.maetje@xxxxxx/
> v9 - https://lore.kernel.org/linux-can/20231107184103.2802678-1-stefan.maetje@xxxxxx/
> v10 - https://lore.kernel.org/linux-can/20231120175657.4070921-1-stefan.maetje@xxxxxx/
>
>
> Stefan Mätje (2):
> MAINTAINERS: add Stefan Mätje as maintainer for the esd electronics
> GmbH PCIe/402 CAN drivers
> can: esd: add support for esd GmbH PCIe/402 CAN interface family
>
> MAINTAINERS | 7 +
> drivers/net/can/Kconfig | 1 +
> drivers/net/can/Makefile | 1 +
> drivers/net/can/esd/Kconfig | 12 +
> drivers/net/can/esd/Makefile | 7 +
> drivers/net/can/esd/esd_402_pci-core.c | 514 +++++++++++++++++
> drivers/net/can/esd/esdacc.c | 764 +++++++++++++++++++++++++
> drivers/net/can/esd/esdacc.h | 356 ++++++++++++
> 8 files changed, 1662 insertions(+)
> create mode 100644 drivers/net/can/esd/Kconfig
> create mode 100644 drivers/net/can/esd/Makefile
> create mode 100644 drivers/net/can/esd/esd_402_pci-core.c
> create mode 100644 drivers/net/can/esd/esdacc.c
> create mode 100644 drivers/net/can/esd/esdacc.h
>
>
> base-commit: 93e7eca853ca0087b129433630ddd89288d2b8b4
