VPP as data-plane

[Chetan Kumar]

Hi,

I am still trying to understand SONiC. 

I searched through  the archives and net, did not find SONiC SAI layer implementation for fd.io VPP. 

Is my search correct? No one ever felt this was one of the option?

Any thoughts

Thanks

C

[Chetan Kumar]

Hi,

If there is no implementation and if this make sense, I am planning to add this. 

Please let me know if this make sense.

Thanks

C

[Nilesh Inamdar]

Hi Shivakumar,

I am also looking for SAI layer for vpp.

Did you write it or got any info ?

Thanks

Nilesh

[Kishore Atreya]

Is the idea to use the SONiC control plane on top of a VPP data plane? The SAI today doesn't define a VPP pipeline. This has to be done and submitted to the community.

What is the use case?

[Masaru OKI]

SONiC-VS is working as a virtual machine, but not enough throughput.

2022年10月1日(土) 5:11 Kishore Atreya <atreya....@gmail.com>:

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[Nilesh Inamdar]

Hi Kishore,

Yes, the idea is to use SONIC as a control plane and VPP as a data plane.

The use case here is to have a SAI layer working for VPP as a data plane, so that all the information(for features like VLAN, ACL, IPSec, etc) from the SONIC control plane can be programmed into the VPP.

Currently, I am using VS as a build target for SONIC.

In SONIC code, I see that there is SAI code under the platform directory for various platforms like mellanox, broadcom, etc.

I would need some pointers to start writing SAI support for VPP as a data plane.

Do I need to add SAI code in platform directory VS ? Or do I need to create a new folder under a platform directory named as VPP and write new SAI code there? Also there is SAI related code in "src/sonic-sairedis/SAI".

So any pointers/doc on how to start writing SAI implementation for VPP ?

Thanks in advance for help.

Thanks and regards

Nilesh Inamdar

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[Shashidhar Patil]

Hi Shivkumar,

   I have a working SONiC+VPP for data plane implementation that I plan to commit in few weeks. The code changes are still in alpha state. 

At the moment I have routing(IPv4, IPv6)/interface/Host Path(ARP, routing protocols etc) functionality working.  Currently working on support few more features.

Will update this forum about the status and results in few weeks.

Thanks

-Shashidhar

[Nilesh Inamdar]

Hi Shashidhar

Does the communication between SONC and VPP is via SAI layer ?

Thanks

Nilesh Inamdar

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[Shashidhar Patil]

Yes the communication is through Sonic SAI layer.

[Nilesh Inamdar]

Hi Shashidhar,

Will it be possible for you to share SAI code with us (for SONIC + VPP) ?

We have also started writing SAI for vpp as a platform. We are planning to implement vlan, ipsec, acl, etc.

But before that we wanted to look into SAI layer implementation.

If possible can you please share your code(in alpa state is also fine with us) so that we can understand the SAI implementation ?

Thanks

Nilesh Inamdar

[Shashidhar Patil]

Hi Nilesh,

    Sorry to say that I can't yet share the source code.  Please wait for a few more weeks.  

Thanks

-Shashidhar

[Nilesh Inamdar]

Ok, no problem. 

[Nilesh Inamdar]

Hi Shashidhar,

We have also started working on VPP as a data plane for SONIC. 

Can you please share your timelines when you plan to make the code available ?

So that we need not spend time duplicating the work.

Thanks and regards,

Nilesh Inamdar

[Shashidhar Patil]

Hi Nilesh,

     We are still in development mode. The code will be made available , after due process, 3 months from now. Thanks.

-Shashidhar

[Nilesh Inamdar]

Hi Shashidhar,

Thanks for sharing information.

Thanks

Nilesh Inamdar

[Neil McKee]

I know this is not likely to be part of any first-pass implementation,  but just wanted to add that I have started working on a sFlow plugin to the VPP dataplane.

There is a learning curve -- still more questions than answers -- but it looks like it is going to perform well:

https://github.com/sflow/vpp/tree/master/src/plugins/sflow

The sflow configuration is currently passed to hsflowd via redis.  It consists of both interface sampling rates and collector targets.  The vpp dataplane just needs to know the interfaces and their sampling rates ("sflow enable <interface> <sampling_N>").  VPP then sends samples to the standard Linux PSAMPLE netlink channel just like, say, the Broadcom or Mellanox ASIC driver.  That should mean the SAI -> vppctrl mappings for sFlow will be straightforward.

One thing to watch out for is the mapping between SONiC ifIndex numbers,  Linux ifIndex numbers,  and VPPs internal "software ifindex number".  I think it would be better for VPP if it was never expected to deal with the SONiC ifIndex numbers.  Looking at how others have done this (https://github.com/pimvanpelt/lcpng), it seems you will want to create a "tap" interface corresponding to each physical switch port even if VPP has taken over that port (NIC) over with the dpdk driver.  That way what VPP sees as the "hardware ifindex number" will be the Linux ifIndex number that is required for PSAMPLE.  Does this make sense?

I appreciate that this might be a distraction for now,  but please keep me in the loop when the time comes.

Neil

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Neil McKee
InMon Corp.

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[Shashidhar Patil]

Hi Neil,

     There is one-to-one correspondence between SONiC and VPP data plane interfaces. Ethernet0(sonic) ---> host-eth0 (vpp).

The saivpp layer maintains this ifindex mapping. The API translation layer will duly pass the require ifindex to vpp. So VPP

is oblivious to SONiC side of logic.

Thanks

-Shashidhar

[Neil McKee]

Sounds good, but does the VPP data plane also know the underlying Linux ifIndex numbers?

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Neil McKee
InMon Corp.

[Amit Limaye]

Hey Shashidhar,

                       have you guys made any progress on open sourcing the code. 

[marcos...@gmail.com]

It was finally published last month: https://github.com/sonic-net/sonic-platform-vpp

[Aakash Kumar.S]

Hi,

Is there a plan or an ongoing activity to support DASH APIs under sonic-platform-vpp ?

[Shashidhar Patil]

Hi Aakash,

    There is no plan yet to support DASH APIs/features in VPP. We will support dash in the future.

That said the saivpp accepts the API requests but does not act on them.

The features mentioned in the linke below are planned (Phase 2 onwards).

https://github.com/sonic-net/sonic-platform-vpp/blob/main/TODO.md

Thanks

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[Aakash Kumar.S]

Hi  Shashidhar,

Thanks for the reply. I had gone through that link. But the features mentioned ( i.e Phase 2 onwards) doesn't talk about DASH objects. Hence the question.

Thanks,

Aakash

[Aakash Kumar.S]

Hi Shashidhar,

Maybe i understood differently earlier. Are you trying to say the DASH support would be planned post completion of phase4 ? 

If that's the case (and I know its might be too early to ask, but) do we have a tentative timeline when DASH support would be planned ?

Thanks,

Aakash