RARE user and assistance email list

[Alexander Gall <>]

Hi Marcos

Just a quick follow-up. Can you please show me the output of
"module-show" for your plugins in bf_pltfm.qsfp context of bfshell?
At the bottom of the output it will say something similar to

-------------- Host interface --------------
Standard supported                      Lns 
XLPPI            4 X 10.3125Gbd NRZ     4   
100GBASE-CR4     4 x 25.78125Gbd NRZ    4   
25GBASE-CR CA-L  1 x 25.78125 Gbd NRZ   1   

This will show which of the speed settings (on the electrical/host
side) can be applied to that particular plugin.

And after a bit more thought, please ignore my comment about something
missing in the SDE. The $PORT table also has a field "$N_LANES" which
conveys the number of lanes requested for a particular speed setting,
so that's ok. Then we will only have to come up with a way to
configure this in freertr and pass it on to bf-forwarder.

-- 
Alex


On Wed, 15 Mar 2023 07:44:25 +0100, Alexander Gall <> said:

> 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

> SWITCH
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