AW: Project Discussion for GSoC 2023

Tue Feb 21 08:30:50 UTC 2023

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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