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[Alexander Gall <>]

Hi Marcos

Yes, I'm afraid this is not yet supported. The issue is that with
Tofino2 there are now multiple configurations for a 100G port. With
Tofino1, it could only mean 4 lanes with 25G, but now we can have 100G
on 1 or two lanes as well. If you look at the command help in bfshell
pm context, you can see the additional speed designators

100G(100G/100G-R4, 100G-R2, 100G-R1)

100G-R1 and 100G-R2 are the 1 and two lane variants. The problem is
that freertr currently only accepts an integer as the speed and only
"100" is accepted for a 100G port, so we can't pass the additional
information on to the bf-forwarder.  So we'll need that and the
additional logic to translate this into the correct setting for the
port configuration.

However, there is an additional problem in the SDE :( It seems to me
that these new speed settings are not yet supported by the BFRT
either. Looking at the "string_choises" for the $PORT pseudo table in
bfrt_python via bfshell:

  'BF_SPEED_1G',
  'BF_SPEED_10G',
  'BF_SPEED_25G',
  'BF_SPEED_40G',
  'BF_SPEED_40G_NB',
  'BF_SPEED_40G_NON_BREAKABLE',
  'BF_SPEED_50G',
  'BF_SPEED_100G',
  'BF_SPEED_200G',
  'BF_SPEED_400G'],
                    
It seems like we cannot implement the equivalent of "port-add <foo>
100G-R1" at the moment. I'll have to look into that and maybe ask in
the Intel forum.

-- 
Alex

On Tue, 14 Mar 2023 17:47:42 +0000, Marcos Felipe Schwarz 
<> said:

> Hi all,
> We are trying to configure a 1x400G to 4x100G breakout on Tofino2, but it 
> seems to not be supported.

> Follows my configuration:

> +------------------------------------------------------------------------------------+
> |server p4lang p4                                                           
>          |
> |                                                                           
>          |
> |export-port sdn13000 288 100 3 1 0                                         
>          |
> |                                                                           
>          |
> |export-port sdn13004 292 100 3 1 0                                         
>          |
> |                                                                           
>          |
> |export-port sdn12000 296 100 3 1 0                                         
>          |
> |                                                                           
>          |
> |export-port sdn12004 300 100 3 1 0                                         
>          |
> |                                                                           
>          |
> |export-port sdn11000 304 100 3 1 0                                         
>          |
> |                                                                           
>          |
> |export-port sdn11002 306 100 3 1 0                                         
>          |
> |                                                                           
>          |
> |export-port sdn11004 308 100 3 1 0                                         
>          |
> |                                                                           
>          |
> |export-port sdn11006 310 100 3 1 0                                         
>          |
> |                                                                           
>          |
> |interconnect ethernet0                                                     
>          |
> |                                                                           
>          |
> |vrf p4                                                                     
>          |
> |                                                                           
>          |
> |exit                                                                       
>          |
> +------------------------------------------------------------------------------------+

> sdn12XXX and sdn13XXX are 1x400G to 2x200G breakout, and are working 
> correctly. But for sdn11XXX it didn’t work, at bfshell, we can verify that 
> it didn’t configured the lanes correctly:

> +------------------------------------------------------------------------------------+
> |11/0 |22/0|304|2/48|100G   | RS |Ds|Au|NO |ENB|DWN|  NONE  |               
> 0|       |
> |               0|                                                          
>          |
> |                                                                           
>          |
> |11/1 
> |22/1|305|2/49|-------|----|--|--|---|---|---|--------|----------------|    
>    |
> |----------------|-                                                         
>          |
> |                                                                           
>          |
> |11/2 
> |22/2|306|2/50|-------|----|--|--|---|---|---|--------|----------------|    
>    |
> |----------------|-                                                         
>          |
> |                                                                           
>          |
> |11/3 
> |22/3|307|2/51|-------|----|--|--|---|---|---|--------|----------------|    
>    |
> |----------------|-                                                         
>          |
> |                                                                           
>          |
> |11/4 |22/4|308|2/52|100G   | RS |Ds|Au|NO |ENB|DWN|  NONE  |               
> 0|       |
> |               0|                                                          
>          |
> |                                                                           
>          |
> |11/5 
> |22/5|309|2/53|-------|----|--|--|---|---|---|--------|----------------|    
>    |
> |----------------|-                                                         
>          |
> |                                                                           
>          |
> |11/6 
> |22/6|310|2/54|-------|----|--|--|---|---|---|--------|----------------|    
>    |
> |----------------|-                                                         
>          |
> |                                                                           
>          |
> |11/7 
> |22/7|311|2/55|-------|----|--|--|---|---|---|--------|----------------|    
>    |
> |----------------|-                                                         
>          |
> +------------------------------------------------------------------------------------+

> Regards,

> Marcos Schwarz | Gerente de P&D | R&D Manager

> Gerência de P&D em Ciberinfraestrutura (GCI) | Cyberinfrastructure R&D 
> Management

> Tel.: +55 (19) 98303-3010 | Teams: 

> www.rnp.br

> cid:fefa97ac-2f79-4bc6-842e-23dbdb886128

-- 
Alexander Gall, Network

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