Project Discussion for GSoC 2023

Wed Mar 1 14:49:25 UTC 2023

Gabriel.. can you at least file a ticket and put your source on it for
others to start from? I suspect that if it works, it is likely OK to merge
unless you have other concerns.Posting it as a patch would be great.

Viraj.. there isn't a leon3 network controller simulation in qemu. There
were free bitstreams for some FPGA boards but I don't know if they include
the network and I can't find them anymore.

--joel

On Sun, Feb 26, 2023 at 3:22 AM Viraj Jagadale <virajjagadale123 at gmail.com>
wrote:

> Thanks, Gabriel, I will surely go through it this week.
>
> I have been reading about writing driver code and noted the following
> steps that I would need to follow:
>
>    1.
>
>    Select the hardware device for which the driver has to be written.
>    2.
>
>    Read the device specification and protocol used. Find the device
>    address to communicate with the device
>    3.
>
>    Write the skeleton driver to handle basic operations such as
>    input/output, and initialization.
>    4.
>
>    Implement necessary functions for Greth lwip, such as a low-level
>    interface between the driver and lwip networking stack.
>    5.
>
>    Testing and optimizing the driver.
>
>
> As Daniel suggested, I read about the GBIT Ethernet MAC and made notes on
> Google Docs. As I learn more about the various sections, I will add more
> content to this doc file
> <https://docs.google.com/document/d/1a12F6O883W9g06EP9k1KFMJX8wQq0TGRg9nUP0qLyfI/edit?usp=sharing>
> .
>
> I had a question about hardware. Can I complete this project with the Qemu
> emulator?
>
> Regards,
> Viraj
>
> On Fri, Feb 24, 2023 at 4:28 PM <Gabriel.Moyano at dlr.de> wrote:
>
>> Hi Viraj,
>>
>>
>>
>> Please find the code in this branch:
>> https://github.com/GabrielDai/rtems-libbsd/tree/port-greth-to-5-freebsd-12
>>
>>
>>
>> Since this driver depends on drvmgr, you’ll have to compile your bsp with
>> support for it (make sure your bsp register the driver for your gaisler
>> card using the drvmgr functions).
>>
>> Moreover, it is needed to add the following line for your bsp in
>> “nexus-devices.h” (rtems-libbsd):
>>
>>                 SYSINIT_DRIVER_REFERENCE(grcard, pci);
>>
>> This line will add a device (called grcard).
>>
>> During booting (if the gaisler card get recognized) it will create child
>> devices (greth#) for the ethernet interfaces.
>>
>>
>>
>> I hope this helps you.
>>
>>
>>
>> Have fun coding,
>>
>> Gabriel
>>
>>
>>
>> *Von:* Viraj Jagadale <virajjagadale123 at gmail.com>
>> *Gesendet:* Dienstag, 21. Februar 2023 17:36
>> *An:* Moyano Heredia, Victor Gabriel <Gabriel.Moyano at dlr.de>;
>> daniel at gaisler.com; devel at rtems.org
>> *Betreff:* Re: Project Discussion for GSoC 2023
>>
>>
>>
>> Hi Daniel and Gabriel,
>>
>>
>>
>> Thank you for responding. I don't own an ARTY A7-100T board. As
>> suggested, I will study the GRETH_GBIT manual at the same time. Can I refer
>> to the DP83848 or LAN8742A documentation for stm32, both of which support
>> legacy stack and lwip? If not, could you please recommend a device?
>>
>>
>> Please share the driver for rtems-libbsd with me as it will be very
>> useful as a starting point.
>>
>>
>>
>> Regards,
>>
>> Viraj.
>>
>>
>>
>> On Tue, Feb 21, 2023 at 2:00 PM <Gabriel.Moyano at dlr.de> wrote:
>>
>> Hi Viraj,
>>
>>
>>
>> We ported the driver for greth to rtems-libbsd in the past but never got
>> to submit it (it might need some further refinement). The driver depends on
>> the driver manager (drvmgr). Not sure if this is the best approach but it
>> is a good starting point and we’d be happy to share it.
>>
>>
>>
>> Best regards,
>>
>> Gabriel
>>
>>
>>
>>
>>
>> *Von:* devel <devel-bounces at rtems.org> *Im Auftrag von *Daniel Hellstrom
>> *Gesendet:* Montag, 20. Februar 2023 15:59
>> *An:* Viraj Jagadale <virajjagadale123 at gmail.com>; devel at rtems.org
>> *Cc:* kinsey.moore at rtems.org; andrei at chichak.ca
>> *Betreff:* Re: Project Discussion for GSoC 2023
>>
>>
>>
>> Hi Viraj,
>>
>> There is an old GRETH network driver as part of the old network stack
>> that would be a good reference.
>>
>> Note that the old driver supports two IPs (GRETH 10/100, and GRETH_GBIT
>> 10/100/1000). The GRETH_GBIT IP is mostly backwards compatible with the
>> GRETH, but as some additional functionality to off load the CPU with
>> UDP/TCP check-summing, unaligned DMA, and scatter-gather DMA for example.
>> One approach could be to begin to focus on the more capable GRETH_GBIT IP
>> first, section 14:
>>
>>     https://www.gaisler.com/doc/gr740/GR740-UM-DS-2-5.pdf
>>
>>     or from the IP manual, section XX:
>>
>>     https://www.gaisler.com/products/grlib/grip.pdf
>>
>> Please keep in mind that the GRETH driver will be used by both
>> SPARC/LEON3 BSP and RISC-V/NOEL-V BSP in the future.
>>
>> It sounds as a good approach to look at the interface of the LWIP stack
>> towards the Network Device Driver, for example the DEC driver to learn
>> however the best would be if there is a MAC device supported both by legacy
>> stack and the LWIP? Simultaneously you could study the GRETH_GBIT manual
>> with register and DMA interface and the old device driver source code?
>>
>> If you have a ARTY A7-100T board you could use the RISC-V design to get
>> access to the GRETH IP easily get started with. The GRMON eval version
>> would also work together with it for a hardware-debugger (no additional
>> cost required) which you can connect GDB for source debugging if you wish:
>>
>>     https://www.gaisler.com/index.php/products/processors/noel-v-examples
>>
>>     https://www.gaisler.com/index.php/products/debug-tools/grmon3
>>
>> Kind Regards,
>> Daniel
>>
>>
>>
>>
>>
>>
>>
>> On 2023-02-13 04:25, Viraj Jagadale wrote:
>>
>> Dear Community,
>>
>> I am interested in contributing to RTEMS and will be participating in
>> GSoC 2023. I am interested in projects #4595
>> <https://devel.rtems.org/ticket/4595> and #4596
>> <https://devel.rtems.org/ticket/4596> because I am passionate about
>> networking. I'm currently concentrating solely on #4595. I'm aware that
>> I'll need to study and comprehend the lwip stack documentation, as well as
>> how the Ethernet protocol is implemented and networking services are
>> provided for applications. Then I'll have to devise a strategy for
>> designing the driver architecture. I'm thinking about reading the RTEMS
>> Legacy Networking User Manual and understanding the DEC 21140 example to
>> get started. I'm not sure if this is the right approach, and I'll need your
>> advice. I am also willing to help with existing bugs and documentation
>> updates.
>>
>>
>>
>> Regards,
>>
>> Viraj Jagadale.
>>
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